CN110903535A - Low-smoke halogen-free flame-retardant sheath material with good cold resistance for cable and preparation method thereof - Google Patents
Low-smoke halogen-free flame-retardant sheath material with good cold resistance for cable and preparation method thereof Download PDFInfo
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- CN110903535A CN110903535A CN201911157504.3A CN201911157504A CN110903535A CN 110903535 A CN110903535 A CN 110903535A CN 201911157504 A CN201911157504 A CN 201911157504A CN 110903535 A CN110903535 A CN 110903535A
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- RNFJDJUURJAICM-UHFFFAOYSA-N 2,2,4,4,6,6-hexaphenoxy-1,3,5-triaza-2$l^{5},4$l^{5},6$l^{5}-triphosphacyclohexa-1,3,5-triene Chemical compound N=1P(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP=1(OC=1C=CC=CC=1)OC1=CC=CC=C1 RNFJDJUURJAICM-UHFFFAOYSA-N 0.000 title claims abstract description 30
- 239000003063 flame retardant Substances 0.000 title claims abstract description 30
- 239000000463 material Substances 0.000 title claims abstract description 28
- 239000000779 smoke Substances 0.000 title claims abstract description 22
- 238000002360 preparation method Methods 0.000 title claims description 9
- 239000005038 ethylene vinyl acetate Substances 0.000 claims abstract description 18
- 229920001200 poly(ethylene-vinyl acetate) Polymers 0.000 claims abstract description 18
- 239000003963 antioxidant agent Substances 0.000 claims abstract description 15
- 230000003078 antioxidant effect Effects 0.000 claims abstract description 15
- 229920001577 copolymer Polymers 0.000 claims abstract description 14
- 239000007822 coupling agent Substances 0.000 claims abstract description 13
- 239000004594 Masterbatch (MB) Substances 0.000 claims abstract description 11
- 229920000092 linear low density polyethylene Polymers 0.000 claims abstract description 10
- 239000004707 linear low-density polyethylene Substances 0.000 claims abstract description 10
- 239000000314 lubricant Substances 0.000 claims abstract description 10
- 239000000203 mixture Substances 0.000 claims abstract description 10
- 229920005672 polyolefin resin Polymers 0.000 claims abstract description 9
- 229920001296 polysiloxane Polymers 0.000 claims abstract description 6
- KPUWHANPEXNPJT-UHFFFAOYSA-N disiloxane Chemical class [SiH3]O[SiH3] KPUWHANPEXNPJT-UHFFFAOYSA-N 0.000 claims abstract description 3
- FWDBOZPQNFPOLF-UHFFFAOYSA-N ethenyl(triethoxy)silane Chemical group CCO[Si](OCC)(OCC)C=C FWDBOZPQNFPOLF-UHFFFAOYSA-N 0.000 claims abstract description 3
- 238000000034 method Methods 0.000 claims description 11
- GHKOFFNLGXMVNJ-UHFFFAOYSA-N Didodecyl thiobispropanoate Chemical compound CCCCCCCCCCCCOC(=O)CCSCCC(=O)OCCCCCCCCCCCC GHKOFFNLGXMVNJ-UHFFFAOYSA-N 0.000 claims description 7
- JKIJEFPNVSHHEI-UHFFFAOYSA-N Phenol, 2,4-bis(1,1-dimethylethyl)-, phosphite (3:1) Chemical compound CC(C)(C)C1=CC(C(C)(C)C)=CC=C1OP(OC=1C(=CC(=CC=1)C(C)(C)C)C(C)(C)C)OC1=CC=C(C(C)(C)C)C=C1C(C)(C)C JKIJEFPNVSHHEI-UHFFFAOYSA-N 0.000 claims description 7
- 239000000155 melt Substances 0.000 claims description 6
- BGYHLZZASRKEJE-UHFFFAOYSA-N [3-[3-(3,5-ditert-butyl-4-hydroxyphenyl)propanoyloxy]-2,2-bis[3-(3,5-ditert-butyl-4-hydroxyphenyl)propanoyloxymethyl]propyl] 3-(3,5-ditert-butyl-4-hydroxyphenyl)propanoate Chemical compound CC(C)(C)C1=C(O)C(C(C)(C)C)=CC(CCC(=O)OCC(COC(=O)CCC=2C=C(C(O)=C(C=2)C(C)(C)C)C(C)(C)C)(COC(=O)CCC=2C=C(C(O)=C(C=2)C(C)(C)C)C(C)(C)C)COC(=O)CCC=2C=C(C(O)=C(C=2)C(C)(C)C)C(C)(C)C)=C1 BGYHLZZASRKEJE-UHFFFAOYSA-N 0.000 claims description 5
- WNROFYMDJYEPJX-UHFFFAOYSA-K aluminium hydroxide Chemical compound [OH-].[OH-].[OH-].[Al+3] WNROFYMDJYEPJX-UHFFFAOYSA-K 0.000 claims description 5
- VTHJTEIRLNZDEV-UHFFFAOYSA-L magnesium dihydroxide Chemical compound [OH-].[OH-].[Mg+2] VTHJTEIRLNZDEV-UHFFFAOYSA-L 0.000 claims description 5
- 229910001862 magnesium hydroxide Inorganic materials 0.000 claims description 5
- 239000000347 magnesium hydroxide Substances 0.000 claims description 5
- 239000002245 particle Substances 0.000 claims description 4
- -1 3, 5-di-tert-butyl-4-hydroxyphenyl Chemical group 0.000 claims description 3
- 238000001816 cooling Methods 0.000 claims description 3
- 238000001125 extrusion Methods 0.000 claims description 3
- FPYJFEHAWHCUMM-UHFFFAOYSA-N maleic anhydride Chemical compound O=C1OC(=O)C=C1 FPYJFEHAWHCUMM-UHFFFAOYSA-N 0.000 claims description 3
- 239000003508 Dilauryl thiodipropionate Substances 0.000 claims description 2
- XBDQKXXYIPTUBI-UHFFFAOYSA-M Propionate Chemical compound CCC([O-])=O XBDQKXXYIPTUBI-UHFFFAOYSA-M 0.000 claims description 2
- 235000019304 dilauryl thiodipropionate Nutrition 0.000 claims description 2
- 229920001912 maleic anhydride grafted polyethylene Polymers 0.000 claims description 2
- NFHFRUOZVGFOOS-UHFFFAOYSA-N palladium;triphenylphosphane Chemical compound [Pd].C1=CC=CC=C1P(C=1C=CC=CC=1)C1=CC=CC=C1.C1=CC=CC=C1P(C=1C=CC=CC=1)C1=CC=CC=C1.C1=CC=CC=C1P(C=1C=CC=CC=1)C1=CC=CC=C1.C1=CC=CC=C1P(C=1C=CC=CC=1)C1=CC=CC=C1 NFHFRUOZVGFOOS-UHFFFAOYSA-N 0.000 claims description 2
- 238000012216 screening Methods 0.000 claims description 2
- 150000001875 compounds Chemical class 0.000 claims 1
- 230000000052 comparative effect Effects 0.000 description 3
- 229920001684 low density polyethylene Polymers 0.000 description 3
- 239000004702 low-density polyethylene Substances 0.000 description 3
- 238000002156 mixing Methods 0.000 description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 238000005336 cracking Methods 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 239000011159 matrix material Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229920000642 polymer Polymers 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 description 1
- 239000005977 Ethylene Substances 0.000 description 1
- 230000006750 UV protection Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 125000004432 carbon atom Chemical group C* 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 229920001971 elastomer Polymers 0.000 description 1
- 239000000806 elastomer Substances 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- WXZMFSXDPGVJKK-UHFFFAOYSA-N pentaerythritol Chemical compound OCC(CO)(CO)CO WXZMFSXDPGVJKK-UHFFFAOYSA-N 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 239000002861 polymer material Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 238000003878 thermal aging Methods 0.000 description 1
- 229920002725 thermoplastic elastomer Polymers 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
- C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
- C08L23/04—Homopolymers or copolymers of ethene
- C08L23/08—Copolymers of ethene
- C08L23/0846—Copolymers of ethene with unsaturated hydrocarbons containing other atoms than carbon or hydrogen atoms
- C08L23/0853—Vinylacetate
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B3/00—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
- H01B3/18—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances
- H01B3/30—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes
- H01B3/44—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes vinyl resins; acrylic resins
- H01B3/441—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes vinyl resins; acrylic resins from alkenes
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
- C08K2003/2217—Oxides; Hydroxides of metals of magnesium
- C08K2003/2224—Magnesium hydroxide
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
- C08K2003/2227—Oxides; Hydroxides of metals of aluminium
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2201/00—Properties
- C08L2201/02—Flame or fire retardant/resistant
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2201/00—Properties
- C08L2201/22—Halogen free composition
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
- C08L2205/025—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
- C08L2205/035—Polymer mixtures characterised by other features containing three or more polymers in a blend containing four or more polymers in a blend
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- Chemical & Material Sciences (AREA)
- Insulated Conductors (AREA)
- Physics & Mathematics (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Abstract
The invention discloses a low-smoke halogen-free flame-retardant sheath material with good cold resistance for cables, which comprises the following components in parts by weight: 80-90 parts by weight of polyolefin resin; 10-20 parts by weight of a compatilizer; 160-180 parts of a flame retardant; 1-2 parts by weight of a coupling agent; 0.5-1 part by weight of an antioxidant; 4-6 parts of a lubricant; the polyolefin resin is a mixture of an ethylene-vinyl acetate copolymer, an ethylene-octene copolymer and metallocene modified linear low density polyethylene, and the weight ratio is 30-50: 10-30: 20-40 parts of; the coupling agent is a vinyl triethoxysilane coupling agent; the lubricant is silicone master batch, and the number average molecular weight of siloxane in the silicone master batch is 65-80 ten thousand. The cold resistance of the sheath material is good (the low-temperature brittle temperature reaches-52 ℃), and the cold resistance far exceeds the requirements in the related standards.
Description
Technical Field
The invention belongs to the field of cable preparation, and particularly relates to a low-smoke halogen-free flame-retardant sheath material with good cold resistance for a cable and a preparation method thereof.
Background
The power cable has wide application in industrial production and resident life in China, and mainly plays a role in power transmission. Since the outer jacket material as the protective conductor is in direct contact with the external environment, for example: how to ensure the service life of the material under the environmental conditions of sunlight, rainwater, temperature difference, smoke and the like is a subject of extensive research. The polymer material is embrittled at low temperature, so that the mechanical property is reduced, and the cracking phenomenon is accompanied, thereby reducing the service life of the power cable and even generating various economic and safe great losses. Therefore, in order to ensure normal use of the power cable at a lower temperature and a longer service life, the cold resistance of the sheath material of the power cable should be improved.
While the prior application such as WO2013149369A1 highlights the low temperature resistance of the material, the flame retardant performance, the processing performance and the like of the prior application do not meet the standard requirements of common cable materials.
Aiming at the limitation of the cable sheath material in the using process, the low-smoke halogen-free flame-retardant sheath material capable of solving the problems is needed in the field.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide a low-smoke halogen-free flame-retardant sheath material for a cable with good cold resistance aiming at the problems of embrittlement, cracking and service life reduction of an outer sheath of the cable under a low-temperature condition, wherein the low-smoke halogen-free flame-retardant sheath material has good cold resistance (the low-temperature embrittlement temperature reaches-52 ℃), has good processability and meets the requirements of related standards.
The second purpose of the invention is to provide a preparation method of the low-smoke halogen-free flame-retardant sheath material with good cold resistance for the cable.
A low-smoke halogen-free flame-retardant sheath material with good cold resistance for cables comprises the following components in parts by weight:
80-90 parts by weight of polyolefin resin;
10-20 parts by weight of a compatilizer;
160-180 parts of a flame retardant;
1-2 parts by weight of a coupling agent;
0.5-1 part by weight of an antioxidant;
4-6 parts of a lubricant;
wherein,
the polyolefin resin is a mixture of ethylene-vinyl acetate copolymer (EVA), ethylene-octene copolymer (POE) and metallocene Modified Linear Low Density Polyethylene (MLLDPE), and the weight ratio of the ethylene-vinyl acetate copolymer (EVA), the ethylene-octene copolymer (POE) and the metallocene Modified Linear Low Density Polyethylene (MLLDPE) is (30-50): (10-30): (20-40);
the coupling agent is a vinyl triethoxysilane coupling agent;
the lubricant is silicone master batch, and the number average molecular weight of siloxane in the silicone master batch is 65-80 ten thousand.
In a preferred embodiment of the invention, the ethylene vinyl acetate copolymer (EVA) has a melt index of: 4-7 g/10min, measured by a GB/T3682-2000 method, wherein the content of VA is as follows: 10 to 20 percent of the total weight of the ethylene-vinyl acetate copolymer.
In a preferred embodiment of the invention, the ethylene-octene copolymer (POE) has a melt index of: 1-4 g/10min, measured by a GB/T3682-2000 method, wherein the content of octenes is as follows: 20 to 40 percent of ethylene-octene copolymer based on the total weight of the ethylene-octene copolymer.
In a preferred embodiment of the invention, the melt index of the metallocene Modified Linear Low Density Polyethylene (MLLDPE) is 1-4 g/10min, and is measured by a GB/T3682-2000 method.
In a preferred embodiment of the present invention, the flame retardant is any one or more of aluminum hydroxide or magnesium hydroxide.
In a preferred embodiment of the invention, the median particle diameter of the aluminum hydroxide is 1.5-2.3 μm, and the specific surface area is 4-6 square meters per gram; the magnesium hydroxide has a median particle size of 1.5-2.3 micrometers and a specific surface area of 4-6 square meters per gram, and is obtained by measuring according to a BET specific surface area method.
In a preferred embodiment of the present invention, the compatibilizer is any one or more of maleic anhydride grafted polyethylene or maleic anhydride grafted ethylene-octylene ester, and the grafting ratio of the compatibilizer is 0.8% to 2%.
In a preferred embodiment of the present invention, the antioxidant is any one or more of pentaerythritol tetrakis [ β - (3, 5-di-tert-butyl-4-hydroxyphenyl) propionate ] (antioxidant 1010), dilauryl thiodipropionate (antioxidant DLTP), and tris [2, 4-di-tert-butylphenyl ] phosphite (antioxidant 168).
The antioxidant is preferably a mixture of antioxidant 1010, antioxidant DLTP and antioxidant 168.
In order to realize the second purpose of the invention, the adopted technical scheme is as follows:
a preparation method of a low-smoke halogen-free flame-retardant sheath material with good cold resistance for cables comprises the following steps:
sequentially adding the polyolefin resin, the compatilizer, the flame retardant, the lubricant, the antioxidant and the coupling agent into an internal mixer (the internal mixing time is about 20-30 min) to uniformly mix the components to obtain a master batch;
and extruding and granulating the master batch, and then air-cooling and screening to obtain a product, wherein the extrusion temperature is 130-140 ℃.
The invention has the beneficial effects that:
the cold resistance of the sheath material is good (the low-temperature embrittlement temperature reaches-52 ℃), and far exceeds the requirements in relevant standards (the low-temperature embrittlement temperature is-45 ℃).
Detailed Description
The main principle of the invention is as follows:
in the invention, ethylene-vinyl acetate copolymer (EVA), ethylene-octene copolymer (POE) and metallocene Modified Linear Low Density Polyethylene (MLLDPE) are used as matrix resin components. The ethylene-octene copolymer (POE) has the property of an elastomer, on one hand, the molecular weight distribution is narrow, the short branch chain distribution and the polymer structure are controllable; on the other hand, the molecular chain is a saturated chain, and the molecular chain contains relatively few tertiary carbon atoms, so that the thermoplastic elastomer has excellent thermal aging resistance, ultraviolet resistance, mechanical property, melt strength and processability, and also has the advantages of good dispersibility, good self-adhesiveness and mutual adhesiveness, high equivalent addition impact strength and excellent forming capability. Compared with the common low-density polyethylene (LDPE), the metallocene modified linear low-density polyethylene (MLLDPE) has the advantages of high strength, better heat resistance, higher softening temperature and melting temperature and better low-temperature resistance. The ethylene-vinyl acetate copolymer (EVA), the ethylene-octene copolymer (POE) and the metallocene Modified Linear Low Density Polyethylene (MLLDPE) are blended for use, so that a matrix with good cold resistance can be obtained, and in addition, the comprehensive performance of the system is kept excellent: higher elongation at break, higher oxygen index and excellent processability
The invention will be further illustrated with reference to the following specific examples. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention. In the following examples, the experimental methods without specifying specific conditions were generally determined according to national standards. If there is no national standard, it is carried out according to the international standards in common, to the conventional conditions or to the conditions recommended by the manufacturer. Unless otherwise indicated, all parts are parts by weight, all percentages are percentages by weight, and all polymer molecular weights are number average molecular weights.
The following table 1 is examples 1-5:
the preparation method of the low-smoke halogen-free flame-retardant sheath material with good cold resistance for the cable in the embodiment is characterized by comprising the following steps:
weighing raw materials, cleaning the internal mixer and preheating.
And sequentially adding the polyolefin resin, the compatilizer, the flame retardant, the lubricant, the antioxidant and the coupling agent into an internal mixer, and internally mixing for 20-30 min to uniformly mix the components.
Plasticating the mixed master batch by using a double-cone feeding machine through a double-screw/single-screw double-stage mixing unit extruder at the extrusion temperature of 130-140 ℃, granulating, cooling by air, sorting by using a vibrating screen, and packaging.
Table 2 below shows the performance results of examples 1-5:
comparative example 1
The formulations of the jacket compositions obtained in accordance with the process described in the preparation examples using the raw materials (unit: KG) of the following tables in the corresponding procedure are shown in Table 3 below.
| Comparative example | ||
| EVA | 50 | |
| LDPE | 20 | |
| MLLDPE | 18 | |
| Maleic anhydride grafted with ethylene | 12 | |
| Aluminum hydroxide | 125 | |
| Magnesium hydroxide | 40 | |
| Coupling agent | 1 | |
| Antioxidant 1010 | 0.4 | |
| Antioxidant DLTP | 0.4 | |
| Antioxidant 168 | 0.04 | |
| Lubricant agent | 5 |
Table 4 shows the results of the product performance test of the comparative examples.
TABLE 4
Therefore, the low-smoke halogen-free flame-retardant sheath material has good low-temperature resistance (low-temperature embrittlement temperature of-52 ℃), can even reach-55 ℃, is obviously improved compared with-45 ℃, has good oxygen index, meets the requirements of relevant standards in other properties, and solves the existing technical problems.
The foregoing is merely a preferred embodiment of the invention and is not intended to limit the scope of the invention, which is defined in the claims and their equivalents, which are intended to cover all modifications and equivalents of the claimed invention as fairly fall within the scope of the claims.
All documents referred to herein are incorporated by reference into this application as if each were individually incorporated by reference. It should be understood that various changes and modifications can be made by those skilled in the art after reading the above disclosure, and equivalents fall within the scope of the invention as defined by the appended claims.
Claims (9)
1. The low-smoke halogen-free flame-retardant sheath material for the cable with good cold resistance is characterized by comprising the following components in parts by weight:
80-90 parts by weight of polyolefin resin;
10-20 parts by weight of a compatilizer;
160-180 parts of a flame retardant;
1-2 parts by weight of a coupling agent;
0.5-1 part by weight of an antioxidant;
4-6 parts of a lubricant;
wherein,
the polyolefin resin is a mixture of an ethylene-vinyl acetate copolymer, an ethylene-octene copolymer and metallocene modified linear low-density polyethylene, and the weight ratio of the ethylene-vinyl acetate copolymer to the ethylene-octene copolymer to the metallocene modified linear low-density polyethylene is 30-50: 10-30: 20-40 parts of;
the coupling agent is a vinyl triethoxysilane coupling agent;
the lubricant is silicone master batch, and the number average molecular weight of siloxane in the silicone master batch is 65-80 ten thousand.
2. The low-smoke halogen-free flame-retardant sheath material for the cable with good cold resistance as claimed in claim 1, wherein the melt index of the ethylene-vinyl acetate copolymer (EVA) is as follows: 4-7 g/10min, measured by a GB/T3682-2000 method, wherein the content of VA is as follows: 10 to 20 percent of the total weight of the ethylene-vinyl acetate copolymer.
3. The low-smoke halogen-free flame-retardant sheath material for the cable with good cold resistance as claimed in claim 1, wherein the melt index of the ethylene-octene copolymer (POE) is as follows: 1-4 g/10min, measured by a GB/T3682-2000 method, wherein the content of octenes is as follows: 20 to 40 percent of ethylene-octene copolymer based on the total weight of the ethylene-octene copolymer.
4. The low-smoke halogen-free flame-retardant sheath material for the cable with good cold resistance as claimed in claim 1, wherein the melt index of the metallocene Modified Linear Low Density Polyethylene (MLLDPE) is 1-4 g/10min, and is determined by GB/T3682-2000 method.
5. The low-smoke halogen-free flame-retardant sheath material for the cable, as claimed in claim 1, wherein the flame retardant is any one or more of aluminum hydroxide or magnesium hydroxide; the median particle size of the aluminum hydroxide is 1.5-2.3 mu m, and the specific surface area is 4-6 square meters per gram; the magnesium hydroxide has a median particle size of 1.5-2.3 micrometers and a specific surface area of 4-6 square meters per gram, and is obtained by measuring according to a BET specific surface area method.
6. The low-smoke halogen-free flame-retardant sheath material for the cable as claimed in claim 1, wherein the compatibilizer is one or more of maleic anhydride grafted polyethylene or maleic anhydride grafted ethylene-octenyl ester, and the grafting ratio of the compatibilizer is 0.8-2%.
7. The low-smoke halogen-free flame-retardant cable sheathing compound as claimed in claim 1, wherein the antioxidant is any one or more of pentaerythrityl tetrakis [ β - (3, 5-di-tert-butyl-4-hydroxyphenyl) propionate ] (antioxidant 1010), dilauryl thiodipropionate (antioxidant DLTP), and tris [2, 4-di-tert-butylphenyl ] phosphite (antioxidant 168).
8. The low-smoke halogen-free flame-retardant sheath material for the cable with good cold resistance as claimed in claim 1, wherein the antioxidant is preferably a mixture of antioxidant 1010, antioxidant DLTP and antioxidant 168.
9. The preparation method of the low-smoke halogen-free flame-retardant sheath material for the cable with good cold resistance as claimed in any one of claims 1 to 8, characterized by comprising the following steps:
sequentially adding the polyolefin resin, the compatilizer, the flame retardant, the lubricant, the antioxidant and the coupling agent into an internal mixer to uniformly mix the components to obtain a master batch;
and extruding and granulating the master batch, and then air-cooling and screening to obtain a product, wherein the extrusion temperature is 130-140 ℃.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111732783A (en) * | 2020-07-08 | 2020-10-02 | 上海叶心材料科技有限公司 | Metallocene linear low density polyethylene reinforced wire and cable sheath |
| CN112759820A (en) * | 2020-12-28 | 2021-05-07 | 中广核拓普（湖北）新材料有限公司 | Low-smoke halogen-free flame-retardant polyolefin sheath material for building flame-retardant cable and preparation method thereof |
| CN112759819A (en) * | 2020-12-28 | 2021-05-07 | 中广核拓普（湖北）新材料有限公司 | High-flame-retardance high-light-transmittance low-smoke halogen-free cable material and preparation method thereof |
| CN112759817A (en) * | 2020-12-24 | 2021-05-07 | 金发科技股份有限公司 | Low-shrinkage halogen-free flame-retardant polyethylene composition and preparation method and application thereof |
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| CN114058109A (en) * | 2021-11-30 | 2022-02-18 | 苏州亨利通信材料有限公司 | Halogen-free flame-retardant polyolefin sheath material and preparation method and application thereof |
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| CN112759817A (en) * | 2020-12-24 | 2021-05-07 | 金发科技股份有限公司 | Low-shrinkage halogen-free flame-retardant polyethylene composition and preparation method and application thereof |
| CN112759820A (en) * | 2020-12-28 | 2021-05-07 | 中广核拓普（湖北）新材料有限公司 | Low-smoke halogen-free flame-retardant polyolefin sheath material for building flame-retardant cable and preparation method thereof |
| CN112759819A (en) * | 2020-12-28 | 2021-05-07 | 中广核拓普（湖北）新材料有限公司 | High-flame-retardance high-light-transmittance low-smoke halogen-free cable material and preparation method thereof |
| CN113354891A (en) * | 2021-05-19 | 2021-09-07 | 湖北科普达高分子材料股份有限公司 | Acid-base-resistant and mildew-resistant tight sleeve material for cable and preparation thereof |
| CN113817260A (en) * | 2021-09-29 | 2021-12-21 | 江苏领瑞新材料科技有限公司 | Special low-smoke halogen-free flame-retardant sheath material for polymer-based optical fiber and preparation method thereof |
| CN113912932A (en) * | 2021-11-24 | 2022-01-11 | 中广核拓普（四川）新材料有限公司 | Thermoplastic halogen-free low-smoke flame-retardant polyolefin cable material and preparation method thereof |
| CN114058109A (en) * | 2021-11-30 | 2022-02-18 | 苏州亨利通信材料有限公司 | Halogen-free flame-retardant polyolefin sheath material and preparation method and application thereof |
| CN114316417A (en) * | 2021-11-30 | 2022-04-12 | 中广核拓普（湖北）新材料有限公司 | Halogen-free high-flame-retardant polyolefin sheath material and preparation method thereof |
| CN115612197A (en) * | 2022-09-23 | 2023-01-17 | 中广核拓普（四川）新材料有限公司 | Halogen-free low-smoke flame-retardant polyolefin cross-shaped framework material and preparation method thereof |
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