CN100487001C - Protein-free natural rubber latex, process for producing the same and use thereof - Google Patents
Protein-free natural rubber latex, process for producing the same and use thereof Download PDFInfo
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- CN100487001C CN100487001C CNB2005800132847A CN200580013284A CN100487001C CN 100487001 C CN100487001 C CN 100487001C CN B2005800132847 A CNB2005800132847 A CN B2005800132847A CN 200580013284 A CN200580013284 A CN 200580013284A CN 100487001 C CN100487001 C CN 100487001C
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- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F6/00—Contraceptive devices; Pessaries; Applicators therefor
- A61F6/02—Contraceptive devices; Pessaries; Applicators therefor for use by males
- A61F6/04—Condoms, sheaths or the like, e.g. combined with devices protecting against contagion
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- A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
- A61L29/00—Materials for catheters, medical tubing, cannulae, or endoscopes or for coating catheters
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- A61L31/00—Materials for other surgical articles, e.g. stents, stent-grafts, shunts, surgical drapes, guide wires, materials for adhesion prevention, occluding devices, surgical gloves, tissue fixation devices
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Abstract
A natural rubber latex which is substantially free from proteins specified respectively by bands at 14, 31 and 45 kDa in the SDS-PAGE method; and a process for producing the natural rubber latex as described above which comprises saponifying a natural rubber latex with an alkali hydroxide in the presence of a surfactant. Because of substantially being free from the above proteins causative of the expression of type I allergy, the above-described natural rubber latex is appropriately usable in producing various products such as catheters, rubber gloves, condoms and foamed articles.
Description
Technical field
The present invention relates to remove protein-free natural rubber latex, its Manufacturing approach and use.More particularly, relate to the protein-free natural rubber latex that is substantially free of the distinctive specified molecular weight in natural rubber latex Ruzhong, its manufacture method and uses thereof.
Background technology
So far, automobile tyre, aircraft are with utilizing natural rubber widely in the industrial goods such as tire, belt.Described natural rubber can be gathered to also contain the latex of water, protein, inorganic salts etc. except rubber constituent, and this latex coagulation can be made untreated rubber (crepe rubber or smoked sheet).This untreated rubber can be made needed rubber item through plasticating, cooperate Synergist S-421 95, moulding, sulfuration.In addition, also make many mechanicalss by natural rubber latex itself.For example, be used to make toy balloon, rubber gloves or medical treatment product such as conduit or condom, foam (spongy rubber), rubber thread, rubber hose, tackiness agent, used for paper processing coating agent etc.
The fresh latex of natural rubber also contains nonrubber compositions such as protein, lipid, saccharic, inorganics except the rubber constituent of about 28～30% (weight/volume).Use formic acid this fresh latex to be solidified the nonrubber composition that contains the 6 weight % that have an appointment in the solid natural rubber (untreated rubber) that obtains.The crowd knows that these nonrubber compositions are being important aspect the distinctive rerum natura of demonstration natural rubber.Yet, natural rubber latex articles since the nineteen ninety, the a part of protein that particularly contains in the gloves can cause that the immediate hypersensitivity reaction of I type has become social problems, and U.S. FDA gives a warning to the manufacturer of rubber item and requires to reduce protein from the latex product stripping.
As proteinic reduction method in the latex, the crowd knows has (i) to carry out the method for centrifugation repeatedly, (ii) use method that protein decomposition enzyme handles or the method for (iii) using alkali to handle to latex.Yet, still containing considerable nitrogen component in the proteinic latex adopting these methods to remove, anti-supersensitivity is still insufficient.
The present inventor is to found that the protein in natural rubber latex Ruzhong is at length studied, protein in the natural rubber is present in the slurries (rubber cement) and the rubber particles surface of latex, rubber particles in the latex utilizes lipid and proteinic duplex film to make surface-stable, and the common protein decomposition enzyme of this external application is difficult to remove fully deproteinize.
Therefore, the method for centrifuged latex (i) can not be removed the protein on rubber particles surface though can remove protein in the slurries.Though and the method for using protein decomposition enzyme to handle latex (ii) can utilize protein decomposition enzyme to decompose the protein on rubber particles surface to a certain degree, but insufficient and protein residual minim, and can not from latex, remove the protein decomposition enzyme of use fully, worry can residually might become some allergenic protein.Though the method for using alkali to handle in addition (iii) can be decomposed the protein on rubber particles surface, owing to cause solidifying of rubber particles during this processing, so be difficult under the state of latex, stably carry out these reactions.
In view of described situation, the result that the inventor concentrates on studies has repeatedly found to make the manufacture method that is reduced to the natural rubber below 0.02% as the nitrogenous rate of protein containing ratio index, has applied for patent (opening flat 6-56902 communique with reference to the spy).After this method is to use tensio-active agent and protein decomposition enzyme to handle natural rubber latex, adopt centrifugation to carry out the method that concentrates and wash for 1 to 2 time.The nitrogenous rate of the natural rubber that adopts this method to solidify this natural rubber latex and obtain is below 0.02%.This fact is meant that the rubber of missible oil (cream) Xiang Zhonghan of this latex converts by solids component and contains nitrogen component below 0.02%.Therefore, tensio-active agent and protein decomposition enzyme are handled caoutchouc latex, the employing centrifugation has carried out concentrating and the latex of washing has been removed protein to heavens owing to use, so the gloves that use the natural rubber latex of this lower protein to make have reduced anaphylactoid appearance.
Yet, the rubber gloves that the natural rubber latex of the lower protein that is made by the method that adopts this deproteinization is made, by stricter test method(s) is that scratch method is carried out clinical trial confirm still to have an appointment 8% patient's type i allergic reaction and presented the positive, from the proteinic removal of this meaning also not exclusively (with reference to R.Hayakawa etc., Environ.Dermatol., 6,10 (1999)).
Summary of the invention
Therefore, the objective of the invention is to find out the reason material that type i allergic reaction occurs, the natural rubber latex of having removed this reason material is provided according to this fact of finding out.
Another object of the present invention is to provide above-mentioned natural rubber latex of the present invention in industrial favourable manufacture method.
Another object of the present invention is to provide goods such as the conduit made by above-mentioned natural rubber of the present invention, rubber gloves, condom, foam.
Other objects and advantages of the present invention are found out by the following description.
1st, according to the present invention, above-mentioned purpose of the present invention and advantage realize by the natural rubber latex with following feature: be substantially devoid of 14,31 and the determined protein of each band of 45kDa when adopting the SDS-PAGE method to analyze.
2nd, according to the present invention, the manufacture method of above-mentioned purpose of the present invention and the advantage natural rubber latex of the present invention by having following feature realizes: utilize alkali metal hydroxide that natural rubber latex is carried out saponification in the presence of tensio-active agent.
3rd, according to the present invention, conduit, rubber gloves, condom or the foam of the above-mentioned natural rubber latex manufacturing of the application of the invention are realized above-mentioned purpose of the present invention and advantage.
Description of drawings
Fig. 1 represents the SDS-PAGE measurement result of the saponification natural rubber latex of embodiment 1.
Fig. 2 represents the SDS-PAGE measurement result of fresh natural rubber latex.
Fig. 3 represents to use the SDS-PAGE measurement result of the missible oil phase of the natural rubber latex behind the protein decomposition enzyme deproteinization.
Fig. 4 represents the SDS-PAGE measurement result of the missible oil phase of the saponification natural rubber latex that makes among the embodiment 2～4.
Fig. 5 represents the part (Fig. 5 1) of the gloves made by the saponification natural rubber latex and the part of the gloves of being made by the natural rubber latex behind the deproteinization (Fig. 5 2).
Embodiment
Below, the present invention is described in detail.At first, the manufacture method to natural rubber latex of the present invention describes.The fresh natural rubber latex of gathering is the concentration of about 30%DRC (dry rubber content).In this latex, add tensio-active agent, react with alkali metal hydroxide under certain conditions, with proteolysis, adopt centrifugation to be concentrated to about 60%DRC (this process is shown as concentrated, washing) then, manufacturing is used to make the latex of various mechanicalss, is used to sell or industrial raw material.
The method of the low nitrogenous natural rubber latex of the use protein decomposition enzyme manufacturing that the present inventor has proposed, need to use the latex of 10%DRC left and right sides concentration to carry out the reaction of latex and protein decomposition enzyme, differ widely with the present invention in this, more excellent from manufacturing process present method.In addition, removing the proteinic degree of specified molecular weight also is that present method is far for excellent.
Below, manufacture method of the present invention is described.
The manufacture method of natural rubber latex of the present invention is by in the presence of at least a kind of tensio-active agent that is selected from cats product, anion surfactant and nonionogenic tenside, after using alkali metal hydroxide with the natural rubber latex saponification, the protein that for example adopts centrifugation to break away from adopting saponification breaks away from, washs and implements.
When using alkali metal hydroxide, as mentioned above by using cats product, anion surfactant or nonionogenic tenside can prevent solidifying of latex with the natural rubber latex saponification.But preferably use nonionogenic tenside and/or anion surfactant.
As spendable nonionogenic tenside, for example can enumerate polyoxyalkylene ether system, polyoxyalkylene esters system, polyhydric alcohol fatty acid ester system, sugar fatty acid ester system, alkyglycosides system etc.Again specifically, as polyoxyalkylene ether is nonionogenic tenside, for example can enumerate polyoxyalkylene alkyl, polyoxyalkylene alkyl phenyl ether, polyoxyalkylene polyol alkylene ether, polyoxyalkylene SP styrenated phenol ether, polyoxyalkylene toluylene phenolic ether, polyoxyalkylene triphenylethylene phenolic ether etc.
As the polyoxyalkylene polyol of aforementioned polyoxyalkylene polyol alkylene ether, can enumerate C
2-12Polyvalent alcohol, for example can enumerate propylene glycol, glycerine, Sorbitol Powder, sucrose, tetramethylolmethane, sorbitan etc.
As polyoxyalkylene esters is nonionogenic tenside, for example can enumerate polyoxyalkylene fatty acid ester etc.
As polyhydric alcohol fatty acid ester is nonionogenic tenside, for example can enumerate C
2-12The fatty acid ester of polyvalent alcohol or the fatty acid ester of polyoxyalkylene polyol.More particularly, for example can enumerate Sorbitol Powder fatty acid ester, sorbitan-fatty acid ester, glycerol mono fatty acid ester, dialycerides fat acid esters, polyglycerol fatty acid ester etc.In addition, also can use their polyalkylene oxide affixture, for example polyoxyalkylene sorbitan-fatty acid ester, polyoxyalkylene glycerol fatty acid ester etc.
As sugar fatty acid ester is nonionogenic tenside, for example can enumerate the fatty acid ester of sucrose, glucose, maltose, fructose, polyose etc., also can use their polyalkylene oxide affixture.
As alkyglycosides is nonionogenic tenside, for example can enumerate alkyl glucoside, alkyl poly glucoside, polyoxyalkylene alkyl glucoside, polyoxyalkylene alkyl poly glucoside etc.In addition, also can use their polyalkylene oxide affixture.
As aforementioned polyhydric alcohol fatty acid ester system and sugar fatty acid ester is the lipid acid of tensio-active agent, for example preferably can enumerate C
4-30The saturated or unsaturated fatty acids of straight or branched.
As the alkyl in the tensio-active agent, for example can enumerate C
4-3Alkyl.And, can enumerate and have C as polyoxyalkylenes
2-4The group of alkylidene group, the addition mole number that for example can enumerate ethylene oxide are the polyoxyalkylenes about 1～50 mole.
As anion surfactant, for example can enumerate the tensio-active agent of carboxylic acid system, sulfonic acid system, sulfuric ester system, phosphoric acid ester system etc.
As carboxylic acid is tensio-active agent, for example can enumerate C
6-30Soap, polycarboxylate, sylvate, tall oil fatty acid salt etc., C preferably
10-20Carboxylate salt.Carbon number is lower than at 6 o'clock, and dispersion, the emulsification of protein and impurity are insufficient, and carbon number was difficult to be dispersed in the water greater than 30 o'clock.
As sulfonic acid is tensio-active agent, for example can enumerate alkylbenzene sulfonate, alkylsulfonate, sulfonated alkyl naphathalene, naphthalenesulfonate, diphenyl ether sulfonate etc.
As sulfuric ester is tensio-active agent, for example can enumerate alkyl sulfuric ester salt, polyoxyalkylene alkyl sulfuric ester salt, polyoxyalkylene alkyl phenyl ether sulfate, triphenylethylene phenol sulfuric acid, polyoxyalkylene toluylene phenol sulfuric acid etc.As the salt of these compounds, can enumerate metal-salt for example Na, K, Ca, Mg, Zn salt etc., ammonium salt, amine salt be triethanolamine salt etc. for example.
As phosphoric acid ester is tensio-active agent, for example can enumerate alkyl phosphate salt, polyoxyalkylene phosphate ester salt etc.As the salt of these compounds, can enumerate metal-salt for example Na, K, Ca, Mg, Zn salt etc., ammonium salt, amine salt is triethanolamine salt or the like for example.
The usage quantity of above-mentioned tensio-active agent is preferably added in the ratio of 0.01～5.0% (w/v) with respect to rubber latex, and preferred scope is 0.03～3.0%, and especially preferably 0.05～2.0%.The effect that is lower than following in limited time tensio-active agent is insufficient, causes waste in limited time greater than last.
Tensio-active agent behind the concentrated natural rubber latex, in order to improve stability when preserving natural rubber latex, can be remedied the interpolation aequum.
In addition, as alkali metal hydroxide, preferably use for example sodium hydroxide, potassium hydroxide.The usage quantity of alkali metal hydroxide is with respect to the amount of rubber latex preferred 0.1～10% (w/v), and it is oversize to be lower than 0.1% the reaction time, greater than the tendency that causes coagulation reaction was easily arranged in 10% o'clock.Preferred amount is 0.3～8%.
The natural rubber latex that uses alkali metal hydroxide and tensio-active agent to carry out the saponification processing can be fresh natural rubber latex, also can be high ammonia latex.
Reaction times is not particularly limited, but preferred reaction is carried out from about several minutes to 1 day.In addition, latex can stir also and can leave standstill between the reaction period, but stirs from promoting that reaction is preferred.In addition, can carry out temperature regulation as required, be 5 ℃～90 ℃ as suitable temperature, is more preferably 20 ℃～70 ℃.
After the reaction this deproteinized natural rubber latex is concentrated to about 50～70%.By this process, hydrolysis the protein water soluble, spissated degree is high more then to be transferred in the slurries more muchly and removes from latex.Concentration method does not have particular restriction, can adopt methods such as heating concentrates, centrifugation, dialysis, ultra-filtration.Can as required this spissated natural rubber latex be diluted to about more than 10 % again, thereby remove residual protein decomposition product fully and obtain the refined natural rubber latex by further concentrating.And residual hydrolysis the common goods of protein the time do not need special disposal especially.In these processes, must fully guarantee the stability of natural rubber latex, this means that the kind of employed tensio-active agent and amount are important factors.Usually, index as the stability of representing commercially available natural rubber latex, MST value (Mechanical stability time-ASTM D1076-97) is arranged, the saponification natural rubber latex is as commodity, also must have the MST equal or higher, so the selection of the kind of tensio-active agent and amount is extremely important with the MST of natural rubber latex.
The natural rubber latex that has been decomposed by the protein of the invention described above method manufacturing, it is characterized in that, be substantially devoid of when adopting SDS-PAGE (SDS-polyacrylamide gel electrophoresis) to analyze by 14,31 and the determined protein of each band of 45kDa, this point is different with the natural rubber latex of known nitrogen content minimizing in the past.
Wherein, particular proteins is not contained in the natural rubber latex Ruzhong, this means the following meaning.Promptly, use this natural rubber latex of the SDS aqueous solution (sodium lauryl sulphate) extracting, use film dialysis extract by molecular weight 3.5kDa, adding contains the acetone of 10% Tricholroacetic Acid and makes protein precipitation in dialyzate, collect this precipitation and, be dissolved in the aqueous solution of urea with centrifugation, form and be equivalent to concentrate 6 times extract with behind the washing with acetone, use SDS-PAGE (polyacrylamide gel electrophoresis) to measure, do not detect protein.
Promptly, handle the natural rubber latex Ruzhong that the nitrogen content made reduces at the use tensio-active agent that is used as method in the past and protein decomposition enzyme, in the analysis of SDS-PAGE method, even making nitrogen component is below 0.02%, also these bands can occur, show and do not remove particular proteins fully.When adopting the nitrogen component content of same level to compare particularly, when finding that natural rubber latex of the present invention adopts the SDS-PAGE method to analyze, 14,31 and each band of 45kDa all basically or completely dissolve, though and the natural rubber latex that obtains by above-mentioned previous methods is few but still have above-mentioned band.In addition, when the natural rubber latex that the protein decomposition enzyme that adopts above-mentioned previous methods is handled carries out centrifugation, its slurries the distinctive proteinic band of natural rubber latex occurs in mutually significantly, prove the residual undecomposed protein that has, and the slurries the when natural rubber latex that adopts the inventive method to handle carried out centrifugation such band do not occur in mutually, and therefore confirming does not easily have residual protein in the coagulum of the natural rubber latex after the reaction treatment.
In addition, research according to present inventors, even slightly how to contain nitrogen component, but so long as when adopting the SDS-PAGE method to analyze, all do not have 14,31 and the natural rubber latex of each band of 45kDa basically, even the conduit that can provide the patient to type i allergic reaction also can use safely without a doubt, rubber gloves, condom etc. then are provided.
Provide different with natural rubber latex in the past as above-mentioned natural rubber latex of the present invention, distinguish that it is according to being: use protein decomposition enzyme to realize that the natural rubber latex of deproteinization is by using protein decomposition enzyme optionally to cut off rubber and proteinic a part of key reduces nitrogen content, and the deproteinization that the present invention adopts the saponification of having used alkali metal hydroxide to carry out be by non-selectively and stoichiometry ground cut off rubber and proteinic key, protein itself also is hydrolyzed and lower molecular weightization simultaneously.Therefore, natural rubber latex of the present invention is characterized in that to its residual nitrogen containing ratio without limits, the protein of each band of 14,31 and 45kDa when being substantially devoid of the analysis of the distinctive employing of natural rubber latex SDS-PAGE method.
Distinguish in addition, when using this latex to make rubber gloves, can make the colory gloves of very smooth and good hand touch.This gloves quality and the rubber gloves of being made by fresh natural rubber latex are without any difference.Yet, use the rubber gloves of making of the natural rubber latex behind the protein decomposition enzyme deproteinization to produce the tiger fur striped as shown in Figure 5, this is not preferred on quality, is that the emulsification of saponification natural rubber latex is different in this yet.
Below enumerate embodiment and illustrate in greater detail the present invention, but the present invention is not subjected to any restriction of these embodiment.
Embodiment
In the fresh latex that is adjusted to 30%DRC (dry rubber content) (being called for short FL latex) 1.9L, add the 100mL aqueous solution contain 30g sodium hydroxide and, under 70 ℃, carry out 3 hours saponification reactions as Emulgen-70 (polyoxyethylene nonylplenyl ether) 4g of nonionic surface active agent.This latex solution is carried out centrifugation in 8 minutes with 13000rpm, isolate missible oil mutually after, add entry to missible oil in mutually and be adjusted to 60%DRC.The ammonium laurate that adds 0.5g then.
The missible oil that adopts the SDS-PAGE method to measure to be present in the saponification natural rubber latex that makes so mutually with the protein of slurries in mutually.
The as described below mensuration of protein that missible oil contains in mutually.
The missible oil of 17g was used 2% SDS 17mL extracting at room temperature 24 hours mutually.Use by the dialysis membrane of molecular weight 3.5kDa and at room temperature dialysed 24 hours stirring the limit in the cold water of extract limit.In 300 these liquid of μ L, add the acetone 100 μ L contain 10% Tricholroacetic Acid and make protein precipitation, adopt the centrifugation collecting precipitation, in the aqueous solution of urea 50 μ L that behind the washing with acetone it are dissolved in 8M, become and be equivalent to 6 times of spissated extracts.This liquid is measured test portion as SDS-PAGE.Moreover the protein analysis of slurries phase carries out similarly.This measurement result is shown in Fig. 1.Swimming lane 1 among Fig. 1 is the standard molecular weight marker, and swimming lane 2 is measurement results of above-mentioned missible oil phase, and swimming lane 3 is measurement results of above-mentioned slurries phase.In order to compare, missible oil that will the fresh natural rubber latex of centrifugation obtains under same condition and slurries SDS-PAGE mutually measure the results are shown in Fig. 2.In addition, fresh natural rubber latex is adjusted to 10%DRC, add protein decomposition enzyme Alcalase 2.0T (NOVO NordiskBioindustry Co.) and 1.0%SDS again, at room temperature react after 24 hours with the 15000rpm centrifugation, carry out reaching for 2 times concentrating and washing of 60%DRC.By separating the missible oil phase in this deproteinized natural rubber latex, carry out SDS-PAGE and measure.Measurement result is shown in Fig. 3.
The swimming lane 2 of Fig. 1 (missible oil phase) does not show the distinctive band of protein (with reference to the swimming lane 3 of Fig. 2) in natural rubber latex Ruzhong, shows not contain in mutually at the missible oil of this saponification natural rubber latex to adopt the protein shown in 14,31 and each band of 45kDa that the SDS-PAGE method measures.In addition, the swimming lane 3 of Fig. 1 (slurries phase) band occurred in the lower molecular weight zone, this means because the protein in saponification reaction natural rubber latex Ruzhong resolves into low-molecular-weight protein by the hydrolysis of sodium hydroxide, stripping in water.
Though use among Fig. 3 the protein decomposition enzyme deproteinization natural rubber latex missible oil mutually in seldom, find to exist 31 and each band of 45kDa.
The embodiment of the saponification condition variation that makes natural rubber latex is shown
The saponification condition is shown in table 1.Except the saponification condition, adopt condition similarly to Example 1 to experimentize.The missible oil phase of these saponification natural rubber latexes, the result that SDS-PAGE measures all do not occur 14,31 and each band of 45kDa.
Table 1
| The | |
| Embodiment | |
| 2 | |
| Embodiment | |
| 3 | |
| Embodiment 4 | |
In the table, the saponification condition is represented concentration (w/v%), temperature of reaction, the reaction times of NaOH.
The results are shown in Fig. 4 with what the SDS-PAGE that adopts similarly to Example 1 condition to carry out the missible oil phase of gained latex measured.Under the condition of embodiment 2～4, do not occur 14,31 fully, the band of 45kDa.Adopt these saponification conditionally completes to remove these protein as can be known.
Among Fig. 4, swimming lane 1 is the standard molecular weight marker.Swimming lane 2,3,4 is respectively the SDS-PAGE mensuration figure of the missible oil phase of saponified natural rubber latex among the embodiment 2,3,4 successively.
Embodiment 5～6
Implement similarly to Example 1.But use the compound of table 2 to replace Emulgen-70 as tensio-active agent.Result's latex of any one embodiment as can be known measures by SDS-PAGE and does not contain 14,31 and the protein of each band of 45kDa.
Table 2
| Embodiment | Name of | Chemical constitution | 14,31,45kDa band | |
| 5 | Emal E 70C (anion surfactant) | Sodium laureth sulfate | Do not have | |
| 6 | Emulgen 105 (nonionogenic tenside) | Polyoxyethylene lauryl ether | Do not have |
Embodiment 7
Implement the anaphylaxis test of saponification deproteinized natural rubber latex (SAP-NR).Confirm whether to contain the type i allergic reaction antigen of instant type.
The FIT Kit of FIT BIOTECH corporate system is used in experiment, adopts enzyme immunoassay (ELISA) to carry out the proteinic analysis of saponification natural rubber latex, shows the result in table 3.
Object as a comparison, natural rubber latex (FL-NR) is also tested under same condition.
Table 3
(Hev b1:MW 14.6kDa, Hev b3:MW 22.3kDa, Hev b5:MW 17.5kDa, Hev b6.02:MW 4.7kDa are the protein that is called rubber elongation factor (Rubber elongationfactor), small rubber particle protein (Small rubber Particle protein), acid latex protein (Acidic latex protein), slaking hevein (MatureHevein) respectively)
Results verification does not detect protein by the natural rubber latex of saponification deproteinization, needn't worry anaphylaxis.
Embodiment 8
Natural rubber latex is concluded the business as latex on market, and the storage stability of latex is an important index.The result that latex stability of the present invention is measured is shown.Use Emal E 70C and Emulgen-70 tensio-active agent to experimentize during the natural rubber latex saponification.
In being adjusted to the fresh latex of 30%DRC (being called for short FL latex) 1.9L, add aqueous solution 100mL and the above-mentioned tensio-active agent of 4g that contains 30gNaOH, carry out 3 hours saponification reactions at 70 ℃.With 13000rpm this latex is carried out centrifugation in 8 minutes, isolate missible oil mutually after, add entry to missible oil in mutually and be adjusted to 60%DRC.In this latex, add the ammonium laurate of 0.5g and the ammoniacal liquor (28w/v%) of 12g.The Zeta-potential of this latex (mV) is-44mV to be-44mV during Emulgen-70 when using Emal E 70C.Moreover the Zeta-potential of natural rubber latex is-46mV that the colloidal property of affirmation saponification natural rubber latex and natural rubber latex are without any difference.In addition, this latex at room temperature preserved 13 days after, measure MST (mechanical stability test-ASTM D1076-97), it is 1230 seconds during Emal E 70C as a result, is 657 seconds during Emulgen x-70.The MST of high ammonia natural rubber latex under identical preservation condition is 520 seconds, confirms that the saponification natural rubber latex demonstrates the stability higher than natural rubber latex.
Embodiment 9
The character of the vulcanized rubber film that is obtained by the saponification natural rubber latex is shown.
The film (F-1) that research is made by the saponification natural rubber latex reaches the character by the film (F-2) with cooperation saponification natural rubber latex making of forming shown in the table 4.Make the saponification natural rubber latex similarly to Example 1.
F-1 casts in the saponification natural rubber latex to make film on the glass substrate.F-2 is the latex mixing prevulcanized at room temperature that will cooperate by the prescription of table 42 days.This latex mixing is cast on the glass substrate, preserve and made thin film in 2 days.Dry film heating under 120 ℃ was vulcanized in 15 minutes.
The character of film F-1 and F-2 is shown in table 5 and table 6 respectively.
Table 4
| Saponification natural rubber latex (35%DRC) | 100phr |
| Potassium laurate (10%) | 0.1phr |
| Potassium hydroxide (10%) | 0.1phr |
| ZDBC(50％) | 0.7phr |
| Sulphur (50%) | 0.7phr |
| Anti-aging agent (50%) | 1.0phr |
| Titanium oxide (50%) | 0.8phr |
Annotate) ZDBC: zinc dibutyl dithiocarbamate
Anti-aging agent: Wingstay L
Table 5
| F-1 | Film by the natural rubber latex making | |
| EP(ug/g) | 2482 | 2458 |
| Green strength (MPa) | 0.85 | 0.90 |
Table 6
| F-2 | Film by the natural rubber latex making | |
| EP(ug/g) | 3474 | 3498 |
| Tensile strength (MPa) | 21.28 | 20.56 |
EP: can extractive protein (Extractable Protein)
Embodiment 10
Use the saponification natural rubber latex to make rubber gloves.Making method is with the latex mixing of embodiment 9 (F-2) prevulcanized 2 days, to in peptizer (nitrocalcite) aqueous solution, flood dipping taking-up in 25 seconds in the latex mixing of 100 ℃ of exsiccant patterns after aforementioned sulfuration after 20 seconds, carry out thermal treatment (postcure) in 30 minutes at 120 ℃.Washing is taken off from pattern for 30～60 seconds.The photo of the rubber gloves that makes is shown in 1 of Fig. 5.In order to compare, use natural rubber latex as raw material with the protein decomposition enzyme deproteinization, with adopt the rubber gloves made of using the same method be shown in Fig. 52 in.Find the tiger fur striped on these gloves significantly.
Claims (3)
1. natural rubber latex is characterized in that: the determined protein of each band that is substantially devoid of 14,31 and 45kDa when adopting the SDS-PAGE method to analyze; Nitrogen content is 0.02～0.3 weight % with respect to rubber constituent contained in the latex.
2. the manufacture method of the described natural rubber latex of claim 1 is characterized in that: use alkali metal hydroxide that natural rubber latex is carried out saponification in the presence of tensio-active agent.
3. use rubber gloves, conduit, condom or the foam of the natural rubber latex manufacturing of claim 1.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2004086967 | 2004-03-24 | ||
| JP086967/2004 | 2004-03-24 |
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| CN1946744A CN1946744A (en) | 2007-04-11 |
| CN100487001C true CN100487001C (en) | 2009-05-13 |
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| CNB2005800132847A Expired - Fee Related CN100487001C (en) | 2004-03-24 | 2005-03-22 | Protein-free natural rubber latex, process for producing the same and use thereof |
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| Country | Link |
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| JP (1) | JP5140272B2 (en) |
| CN (1) | CN100487001C (en) |
| MY (1) | MY149882A (en) |
| WO (1) | WO2005090412A1 (en) |
Families Citing this family (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| MY159145A (en) * | 2008-12-15 | 2016-12-15 | Sumitomo Rubber Ind | Natural rubber and method for producing the same, rubber composition and pneumatic tire using the same, modified natural rubber and method for producing the same, and rubber composition for tread or for covering carcass cord and pneumatic tire using the same |
| JP5567295B2 (en) * | 2009-07-01 | 2014-08-06 | 住友ゴム工業株式会社 | Puncture sealant |
| JP5658672B2 (en) * | 2009-09-01 | 2015-01-28 | 国立大学法人長岡技術科学大学 | Protein-free natural rubber, its latex and production method thereof |
| CN102115554B (en) * | 2010-01-04 | 2014-09-10 | 住友橡胶工业株式会社 | Rubber composition for tire and studless tire |
| JP5216028B2 (en) | 2010-01-18 | 2013-06-19 | 住友ゴム工業株式会社 | Rubber composition for inner liner and pneumatic tire |
| US9181355B2 (en) | 2010-06-10 | 2015-11-10 | Sumitomo Rubber Industries, Ltd. | Modified natural rubber, method for producing same, rubber composition, and pneumatic tire |
| CN101890779A (en) * | 2010-07-27 | 2010-11-24 | 郑林 | Glove with low soluble protein content and manufacturing method thereof |
| CN101934587A (en) * | 2010-07-27 | 2011-01-05 | 郑林 | Sulfur-free and nitrosamine-free latex glove and manufacturing method thereof |
| JP5466684B2 (en) | 2011-10-25 | 2014-04-09 | 住友ゴム工業株式会社 | Clinch apex rubber composition and pneumatic tire |
| JP5469151B2 (en) | 2011-11-11 | 2014-04-09 | 住友ゴム工業株式会社 | Rubber composition for pneumatic tire and pneumatic tire |
| JP5616369B2 (en) | 2012-01-24 | 2014-10-29 | 住友ゴム工業株式会社 | Rubber composition for tire and pneumatic tire |
| JP2014133829A (en) | 2013-01-10 | 2014-07-24 | Sumitomo Rubber Ind Ltd | Composite body and production method of the same, rubber composition, and pneumatic tire |
| JP5814410B2 (en) | 2014-03-17 | 2015-11-17 | 住友ゴム工業株式会社 | Rubber composition for studless tire and studless tire |
| JP2016214234A (en) * | 2015-05-21 | 2016-12-22 | 株式会社トクヤマ | Nipple pack material for livestock and mastitis prevention method of livestock for milk |
| FR3051795B1 (en) | 2016-05-31 | 2018-06-15 | Compagnie Generale Des Etablissements Michelin | PROCESS FOR DRYING NATURAL RUBBER |
| CN106317960A (en) * | 2016-09-21 | 2017-01-11 | 云南师范大学 | Method for immobilizing proteins in natural rubber latex by aid of modified tannin extract |
| JP7011354B1 (en) | 2021-03-22 | 2022-01-26 | 雪ヶ谷化学工業株式会社 | Discoloration-prevented natural rubber latex sponge and its manufacturing method |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5908893A (en) * | 1994-11-21 | 1999-06-01 | Sumitomo Rubber Industries, Ltd. | Process for producing deproteinized natural rubber latex |
| US5910567A (en) * | 1995-03-14 | 1999-06-08 | Fuji Latex Co., Ltd. | Process for preparing deproteinized natural rubber latex molding and deproteinizing agent for natural rubber latex |
| CN1353116A (en) * | 2000-11-08 | 2002-06-12 | 住友橡胶工业株式会社 | Method of preparing low sensitivity natural rubber latex and deproteinized natural rubber latex and low sensitivity natural rubber and deproteinized natural rubber |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3573498B2 (en) * | 1994-09-14 | 2004-10-06 | 横浜ゴム株式会社 | Production method of natural rubber |
| JP3742196B2 (en) * | 1997-06-24 | 2006-02-01 | 住友ゴム工業株式会社 | Method for producing refined solid natural rubber |
| JP2002145904A (en) * | 2000-11-08 | 2002-05-22 | Sumitomo Rubber Ind Ltd | Deproteinized natural rubber |
| JP5133479B2 (en) * | 2001-07-06 | 2013-01-30 | 住友ゴム工業株式会社 | Method for producing hypoallergenic natural rubber latex |
| JP2004197052A (en) * | 2002-12-20 | 2004-07-15 | Sumitomo Rubber Ind Ltd | Method for manufacturing deproteinized natural rubber latex |
| WO2005012365A1 (en) * | 2003-08-04 | 2005-02-10 | Thai Rubber Latex Corporation (Thailand) Public Company Limited | Deproteinized natural rubber, its composition and use thereof |
-
2005
- 2005-03-22 CN CNB2005800132847A patent/CN100487001C/en not_active Expired - Fee Related
- 2005-03-22 WO PCT/JP2005/005657 patent/WO2005090412A1/en active Application Filing
- 2005-03-22 JP JP2006511339A patent/JP5140272B2/en not_active Expired - Fee Related
- 2005-03-23 MY MYPI20051248 patent/MY149882A/en unknown
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5908893A (en) * | 1994-11-21 | 1999-06-01 | Sumitomo Rubber Industries, Ltd. | Process for producing deproteinized natural rubber latex |
| US5910567A (en) * | 1995-03-14 | 1999-06-08 | Fuji Latex Co., Ltd. | Process for preparing deproteinized natural rubber latex molding and deproteinizing agent for natural rubber latex |
| CN1353116A (en) * | 2000-11-08 | 2002-06-12 | 住友橡胶工业株式会社 | Method of preparing low sensitivity natural rubber latex and deproteinized natural rubber latex and low sensitivity natural rubber and deproteinized natural rubber |
Also Published As
| Publication number | Publication date |
|---|---|
| JPWO2005090412A1 (en) | 2008-01-31 |
| WO2005090412A1 (en) | 2005-09-29 |
| CN1946744A (en) | 2007-04-11 |
| MY149882A (en) | 2013-10-31 |
| JP5140272B2 (en) | 2013-02-06 |
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