KR20060068616A - A antibiotic high impact triple-layered water pipe - Google Patents

Abstract

The present invention provides a triple wall structure comprising an outer and an inner impact hard layer mainly composed of vinyl chloride resin having the same properties, and a central high tensile hard layer composed mainly of a vinyl chloride resin harder than the inner and outer impact hard layers. In the water pipe, by applying a resin composition containing a zeolite inorganic antimicrobial agent to the outer and inner impact hard layer, to obtain excellent tensile strength and low temperature impact strength due to the structural characteristics of the triple wall with the antibacterial effect to prevent the microbial habitat. In addition to improving the adhesion between the central high tensile hard layer and the external and internal impact hard layers, the impact strength can be prevented from being lowered, and the blending process of each component in the work process can also be made at high viscosity at high temperatures. Uniform mixing of each component is possible and workability can be improved It is possible to maintain the germicidal effect continuously.

External impact hard layer, internal impact hard layer, central high tensile hard layer, vinyl chloride resin, zeolite inorganic antibacterial agent, heat stabilizer, antistatic agent

Description

A antibiotic high impact triple-layered water pipe

1 is a perspective view showing a cross-sectional structure of a triple wall structure water pipe

Figure 2 is an optical microscope photograph showing the deposition of the pipe wall for the water pipe of the present invention

3 is an optical micrograph showing the deposition of pipe walls on cast iron water pipes

Figure 4 is a photograph showing the antimicrobial test by the pressure bonding method for the present invention and PVC water pipes

The present invention relates to a triple wall structure impact resistant water pipe to which an antibacterial function is added, and more specifically, to a water pipe having excellent tensile strength and low temperature impact strength due to the structural characteristics of the triple wall together with the antibacterial effect that prevents microbial habitat. It is about.

Metal pipes such as cast iron pipes and zinc pipes that have been used as drinking water conduits in the past have problems such as deterioration of workability due to heavy weight, reduction of water supply capacity due to oxidation and corrosion, and contamination of tap water due to water and white water.

Due to the above problems, recently, synthetic resin pipes, which have superior properties in terms of water resistance and chemical resistance than conventional metal pipes, have been used as water pipes. In particular, polyvinyl chloride pipes have no damage to corrosion and oxidation, and are toxic and odorless. As it is hygienic and light in weight, it is most used for its advantages of easy handling and transport as well as easy bonding and repair.

However, the polyvinyl chloride tube has a low impact strength, which may cause damage due to external pressure. Therefore, the impact strength must be improved through additives such as impact modifiers. It was not easy to use because it had an inverse relationship with low load strength.

In addition, Japanese Utility Model Registration Nos. 62-131185 and 57-33372 disclose a three-layered tube or a synthetic pipe as a method for improving the impact strength of general water pipes. There was a problem in that the constituent materials were different from each other to form an adhesive layer between each layer, and there was a problem in that it was not merely suitable for the use of water pipes requiring strong water pressure because it was merely to increase the impact strength.

Thus, the present inventors have introduced the tri-wall water pipe made of vinyl chloride resin excellent in tensile strength and impact strength through the Republic of Korea Utility Model Registration No. 104328 and the Patent No. The cross-sectional structure of the water pipe is shown in perspective view.

First, in Korean Utility Model Registration No. 104328, the vinyl chloride resin used for the impact resistant hard layers forming the inner and outer layers is different from the vinyl chloride resin used for the intermediate layer by varying the physical properties of the vinyl chloride resin constituting each layer. The softened material is used, and the impact modifier is added to the inner and outer impact hard layers, and the ratio of the thickness of the outer impact hard layer, the central high tensile hard layer, and the inner impact hard layer is 1: 1: 1 from small diameter to large diameter. To a triple wall water pipe adjusted in the range of 1: 3: 1.

In addition, Korean Patent No. 338254 uses a vinyl chloride resin having the same properties as the outer and inner impact hard layers, and a hard vinyl chloride resin than the inner and outer impact hard layers as the central high tensile hard layer, and an impact modifier. Chlorinated Polyethylene (CPE) impact modifiers are used for the outer impact hard layer and inner impact hard layer, and polymethylmethacrylate-butadiene-styrene (MBS) is used for the central high tensile hard layer. A triple wall water pipe added 5 to 10 parts by weight of the resin was proposed.

The triple wall water pipe made of vinyl chloride resin has a different impact degree from the physical properties of the medium by varying the polymerization degree and the critical thickness of the resin constituting the internal and external impact hard layer and the central high tensile hard layer. According to the Superposition Principle of Impact Pulse, both tensile strength and low temperature impact strength were excellent.

On the other hand, in the case of polyvinyl chloride pipes, the water passing through the pipes is always present in the flow state in the pipes due to the characteristics of the water pipe network, and thus, it is easy to inhabit various harmful bacteria in some cases. There was a problem of forming a skim (Skim) inside the tube as well as contaminated water by multiplying the plasticizer, filler, lubricant and the like added during the production of the vinyl tube.

In order to solve the above problems, Korean Patent No. 232263, filed by the present inventors, discloses a resin composition for an antibacterial water pipe, in which an antistatic agent, a heat stabilizer, and various fungicides are mixed and molded at an appropriate ratio during the production of a polyvinyl chloride tube, and the preparation thereof. The method is introduced, and such disinfectant components include phenyl mercuric succinate, phenyl mercuric dinaphthyl methane disulfonate, amine derivative of phenyl mercuric pentacrophenoxide, and copper salt of 8-oxyquinoline. , N- (3-chloroaniyl) hexamium chloride, bis-n-tributylstone oxide, halogenated phenol, cation activator, tribromosalkanilide, neomycin alone or a mixture thereof is used and commercialized Examples of products are Plan-Arome, May & Baker, UK, or Pla-Or, Haarmann & Reimer GmbH, Germany, etc. And use.

The antimicrobial water pipe manufactured using the resin composition as described above may not only prevent contamination of the flowing water by microorganisms and minimize damage to the pipe, but also prevent deterioration caused by antistatic agents and deterioration of physical properties due to the addition of a heat stabilizer. It has the effect that it can.

 Thus, by applying the above-mentioned resin composition for the antimicrobial water pipe to the internal and external impact hard layer of the above-described triple chloride water pipe made of vinyl chloride resin, the tensile strength and strength due to the structural characteristics of the triple wall with the antibacterial effect to prevent the microbial habitat Research has been conducted to have both low temperature impact strength and excellent effect at the same time.

However, in the production of the vinyl chloride resin triple wall water pipe, when the inner and outer hard layers are formed of the resin composition containing the various fungicides described above, the adhesion between the layers is remarkably due to the change in physical properties and the deterioration of dispersibility. It will fall, and thus a problem that the impact strength is lowered.

In addition, since the disinfectant components are mostly weak to heat, the compounding process of each component constituting the resin composition is performed at a low temperature, and thus works in a low viscosity state, so that uniform mixing of each component is difficult and workability is inferior.

Therefore, the present invention is to solve the above problems, in the application of the inner and outer hard layers in the resin composition containing various fungicides in the triple wall water pipe made of vinyl chloride resin, the adhesive strength between each layer is significantly reduced impact strength It is an object of the present invention to provide a triple wall structure impact water pipe with an antibacterial function that can solve the lowering.

The present invention to achieve the above object,

In an impact resistant water pipe made of a vinyl chloride resin having an inner impact hard layer, a central high tensile hard layer, and an outer impact hard layer having a triple wall structure,

The vinyl chloride resin composition forming the internal and external impact hard layers is a resin composition containing a zeolite-based inorganic antibacterial agent as an antistatic agent, a heat stabilizer and a bactericide component,

The vinyl chloride resin composition constituting the central high tensile hard layer is achieved by providing a triple wall structure impact resistant water pipe with an antibacterial function, characterized in that the resin composition is harder than the vinyl chloride resin composition of the inner and outer impact hard layers.

Hereinafter, the present invention will be described in more detail.

The present invention is a triple wall water pipe composed of an outer and an inner shock hard layer mainly composed of vinyl chloride resin and a central high tensile hard layer, wherein the inner layer and the outer layer include a zeolite inorganic antibacterial agent. Due to the antimicrobial effect that prevents the microorganisms from being formed, and the structural characteristics of the triple wall, it is intended to obtain excellent tensile strength and low temperature impact strength by the Superposition Principle of Impact Pulse.

Accordingly, the outer and inner impact hard layers are molded into a resin composition containing a zeolite-based inorganic antibacterial agent as a bactericide component together with an antistatic agent and a heat stabilizer including vinyl chloride resin.

In the resin composition constituting such an outer layer and an inner layer, a zeolites inorganic antimicrobial agent is first intended to prevent the formation of a scheme in the tube by the growth of mold or various harmful bacteria.

In other words, conventionally, in the field of plastic or Korean Patent No. 232263, which was filed by the present inventors, an organic antimicrobial agent was used as a disinfectant component. However, the organic antimicrobial agent is weak to heat and oxidized to heat or reacts with other additives during molding to react to mechanical properties of the final product. Along with the problem of lowering the temperature, the organic antimicrobial agent is weak to heat, and thus, the mixing process of each component constituting the resin composition is performed at a low temperature, so that uniform mixing of the components is difficult and workability is poor. I have pointed out that there is.

Therefore, in view of the above problems, the present invention uses a zeolite-based inorganic antimicrobial agent that does not oxidize and deteriorate even at high temperatures, thereby preventing the physical properties of the resin composition from changing, thereby improving adhesion between the central high tensile hard layer and the external and internal impact hard layers. In addition, the impact strength can be prevented from being lowered, and the mixing process of each component in the work process can also be performed at a high viscosity at high temperature, thereby allowing uniform mixing of each component and improving workability.

In addition, the zeolite inorganic antimicrobial agent is a type of aluminosilicate that has developed a specific surface area, in which a metal ion such as silver or zinc is bound to a zeolite carrier, and is adsorbed to proteins of cell membranes of bacteria or fungi, Because it destroys the structure of cells and incapacitates energy metabolism and kills mycelia, temporary antimicrobial activity is slightly lower than organic antimicrobial agents, but the human body stability is high and resistant bacteria do not appear. Can be.

Since the zeolite inorganic antimicrobial agent can achieve the effect of sterilization, insecticide, disinfection, etc. even with a small amount, the addition amount is preferably 0.8 to 1.0 parts by weight based on 100 parts by weight of polyvinyl chloride, and if the addition amount is less than 0.8 This is because the antimicrobial effect is insignificant, and even if it is added in excess of 1.0 parts by weight, no special antimicrobial activity is increased and the cost increases due to the overexposure of expensive inorganic antimicrobial agents.

The antistatic agent is added to lower the surface electrical resistance of the plastic product including polyvinyl chloride. Surfactants, inorganic salts, polyalcohols, carbon, and the like may be used. Preference is given to using compounds.

Moreover, it is more preferable to use cationic surfactant among surfactant compounds classified into cationic, anionic, nonionic, and amphoteric, and typically, quaternary ammonium salt type, quaternary ammonium resin type, or imidazoline Cationic surfactants and the like can be used.

When the antistatic agent is added to less than 1 part by weight based on 100 parts by weight of polyvinyl chloride, it is difficult to obtain a desirable antistatic effect, and when added in excess of 1.5 parts by weight, the antistatic effect also does not directly increase. However, there is a problem that acts as a rising factor of the manufacturing cost, and if the addition amount is increased more than necessary, there is a problem that the addition amount of the heat stabilizer mixed to prevent the deterioration promoting phenomenon is greatly increased, so the addition amount is 1 to 1.5 parts by weight It is suitable.

The thermal stabilizer is used to prevent deterioration phenomena generated when the antistatic agent is mixed with the polyvinyl chloride resin. The thermal stabilizer is non-toxic Ca-st [Ca ( C ₁₇ H ₃₅ COO) ₂ ], Zn-st [Zn (C ₁₇ H ₃₅ COO) ₂ ] or Tin-Raulate-based and Tin-Malate-based liquids alone or mixed Preference is given to using stabilizers.

Since the amount of the non-toxic thermal stabilizer may vary depending on the amount of the cationic surfactant added as the antistatic agent, 3.5 to 4.5 parts by weight is appropriate in consideration of the addition ratio of the cationic surfactant as described above. .

In addition, in the case of the vinyl chloride resin which is the main component constituting each layer of the triple wall water pipe of the present invention, it is preferable to apply a vinyl chloride resin used for the outer and inner impact hard layers having a polymerization degree of 800 to 1000, If the degree of polymerization is less than 800, the problem is weak ductility occurs, if the degree of polymerization exceeds 1000, fragile problems occur.

On the other hand, as the vinyl chloride resin used in the central high tensile hard layer, it is preferable to apply a polymerization degree of 1000 to 1200. When the polymerization degree is less than 1000, a problem of low tensile strength occurs and the polymerization degree exceeds 1200. In this case, extrusion problems occur due to high loads.

However, there is a limit in controlling the tensile strength and impact strength only by the choice of vinyl chloride resin and the difference in thickness. Especially, in order to further improve the low temperature impact strength, the chlorinated polyethylene type is applied to the external impact hard layer and the internal impact hard layer as an impact modifier. It is preferable to add a (Chlorinated Polyethylene, CPE) impact modifier and a polymethylmethacrylate butadien-styrene (MBS) impact modifier to the central high tensile hard layer.

First, CPE-based impact modifiers are added to internal and external impact hard layers that are directly affected by weatherability and processability, and have a strong resistance to sunlight, and reduce the extrusion resistance by excellent affinity with vinyl chloride resin. It has a high effect in preventing the pipe end from breaking when cutting the pipe into unit lengths.

On the other hand, MBS-based impact modifiers are used in the central high-tension hard layer, while maintaining tensile strength by dispersing the components constituting the MBS-based impact modifiers, and exhibits low temperature impact resistance.

The content of such an impact modifier is preferably added 5 to 10 parts by weight based on 100 parts by weight of the polyvinyl chloride resin used in the inner and outer impact hard layers and the central high tensile hard layer. As the impact strength increases, the tensile strength drops rapidly, so the most appropriate amount should be added. For example, when the impact modifier is added in an amount less than 5 parts by weight, the impact strength is not improved. When added in excess of parts, the tensile strength drops sharply.

Meanwhile, Ca-st [Ca (C ₁₇ H ₃₅ COO) ₂ ], Zn-st [Zn (C ₁₇ H ₃₅ COO) ₂ ], or Tin- as a non-toxic heat stabilizer together with MBS-based impact modifiers in the central high tensile hard layer. 3.5 to 4.5 parts by weight of laurate (Tin-Raulate) and tin maleate (Tin-Malate) alone or mixed liquid stabilizer may be further added to the vinyl chloride resin.

In addition, the inner and outer lubricants such as stearic acid and polyethylene wax are preferably added in an amount of 0.3 to 0.6 parts by weight based on the vinyl chloride resin to the central high tensile hard layer including the outer and inner impact hard layers.

As described above, the materials such as polyvinyl chloride, antistatic agent, heat stabilizer, fungicide and other lubricants, sunscreen agents, processing aids, impact modifiers and fillers used in the production of the external and internal impact hard layer resin compositions may be Due to the different physical properties, the dispersion effect and bonding state of the raw materials are determined according to the order and the mixing temperature at the time of blending, and thus the physical properties of the finally prepared resin composition are determined.

Accordingly, in the present invention, a triple wall composed of an outer and an inner impact hard layer mainly composed of vinyl chloride resin having the same properties and a central high tensile hard layer composed mainly of a vinyl chloride resin harder than the inner and outer impact hard layers. In the water pipe,

The inner and outer impact hard layers are charged with the first step of mixing 0.8 to 1.0 parts by weight of the disinfectant and 0.4 to 0.5 parts by weight of the sunscreen and heat blending at a temperature of 90 to 100 ° C., and the blend prepared from the first step. A second process of mixing 1 to 1.5 parts by weight of the inhibitor, 3.5 to 4.5 parts by weight of a non-toxic heat stabilizer, an appropriate amount of a lubricant and a processing aid, and cooling the mixture to 58 to 62 ° C., and a polychlorinated compound prepared from the second step. 100 parts by weight of vinyl, an appropriate amount of impact modifiers and fillers were mixed by heating to 125 to 135 ℃ and then cooled again to 40 ℃ or less comprises a resin composition prepared by the third step of the composition Provides a triple wall structure impact resistant water pipe.

In the case of blending by the first step, in order to improve the dispersibility in mixing the zeolite-based inorganic disinfectant and the sunscreen (which can be mixed together with the pigment if necessary), it is heated and mixed at a temperature of 90 to 100 ° C. In the second step, in the mixing of raw materials such as heat stabilizer, antistatic agent, internal lubricant, external lubricant, and processing aid to the compound prepared in the first process, the performance of the raw material itself is reduced due to the aggregation of these raw materials. In order to prevent the mixing, the temperature at the time of blending is blended by cooling to 58 to 62 캜.

Finally, in the blending of the polyvinyl chloride resin, impact modifier, and filler having different physical properties from the compound prepared in the second process, in order to improve the bonding strength of each raw material and to remove the gas and water generated during the compounding in advance. After heating and blending at 占 폚, the mixture is cooled to 40 占 폚 or lower.

The water pipe of the triple wall structure according to the present invention has two compound extruders equipped with a synchronization system after compounding the compound raw materials used for the inner and outer impact hard layers and the central high tensile hard layers in different super mixers. Extruded into a mold called coex to make a triple-wall structure to achieve a smooth shape, such as a single layer, and is produced by a multi-layer coextrusion method in which three interlayer spacings are formed uniformly.

As described above, the present invention by applying a resin composition containing a zeolite inorganic antimicrobial agent to the outer and inner impact hard layer of the triple wall water pipe, the impact strength by improving the adhesion between the central high tensile hard layer and the outer and inner impact hard layer Can be prevented from being lowered, and the blending process of each component in the work process can also be made at a high viscosity at high temperature, which enables uniform mixing of each component and improves workability. A lasting effect can be obtained.

Hereinafter, the triple wall structure impact water pipe having an antibacterial function according to the present invention will be described in more detail with reference to the following examples, but the present invention is not limited to the following examples.

<Example 1>

Compound formulation of inner and outer impact hard layers

5 kg of Unikiller-B30 [(Ag, Zn, Na), Al ₂ O ₃ , Si0 ₂ ] and 5 kg of sunscreen as a zeolite inorganic disinfectant were added to a blender and blended at a temperature of 95 ° C. 12 kg of quaternary ammonium salt as an antistatic agent and Ca-st [Ca (C ₁₇ H ₃₅ COO) ₂ ], Zn-st [Zn (C ₁₇ H ₃₅ COO) ₂ ] or tin-laurate, which are nontoxic heat stabilizers. 40 kg of (Tin-Raulate) and Tin-Malate-based liquid mixtures alone or mixed, 5 kg of stearic acid as internal lubricant, 5 kg of polyethylene wax as external lubricant, processing aid of Kaneka.Co. (Kg: PA-30) 1 kg was mixed, cooled to 60 ° C., and then blended. Then, 1000 kg of Hanwha's vinyl chloride resin (product name: P-800) having a degree of polymerization of 800 and Dow Chemical Company (Dow Chemical). Co) CPE-based impact modifier (product name: CPE-3615) 80 kg, Omia (Co) filler (Product name: T-1) 30 kg is added and the mixture is heated to 130 ℃ and cooled at room temperature It was.

Compound formulation of central high tensile hard layer

1000 kg of polyvinyl chloride resin (product name: P-1200) of Hanwha Corporation with a degree of polymerization of 1200 kg, 50 kg of MBS-based impact modifier of LG Chem (product name: MB-830), processing aid of Kaneka.Co (product name: PA-30) 10 kg, Ca-st [Ca (C ₁₇ H ₃₅ COO) ₂ ], Zn- st [Zn (C ₁₇ H ₃₅ COO) ₂ ] or tin-laurate (Tin) -Raulate) and Tin-Malate system alone or mixed liquid stabilizer 40kg, Omia.Co's filler (Product Name: T-1) 60kg and internal lubricant stearic acid 5kg by mixing After mixing for about 15 minutes in a supermixer of 120 ℃ cooled to room temperature.

Multi-layer Coextrusion Manufacturing

In the multi-layer coextruder, two extruders are installed so that the thickness ratio of the inner impact hard layer: the center high tensile hard layer: the outer inner impact hard layer is 1: 2: 1, and the viscosity of the blended raw materials for the impact hard layer and the high tensile hard layer According to (Viscosity), a synchronization system was constructed to equalize the flow by the screw speed of each extruder and the temperature and the speed of the cylinder.

 Through the interlocking system, the resin composition constituting the impact resistant hard layer and the high tensile hard layer naturally meets in a molten state in a die called coex, and the triple wall structure forms a smooth shape like a single layer, and the gap between three layers. The water pipe of the triple wall structure was produced through this uniformly formed multi-layer coextrusion method.

<Example 2>

According to the same apparatus and method as in Example 1, a triple wall structured water pipe was prepared, but a triple wall structured water pipe was prepared with a content of zeolite inorganic fungicide when compounding the internal and external impact hard layers.

<Example 3>

According to the same apparatus and method as in Example 1, a triple wall structured water pipe was prepared, but a triple wall structured water pipe was manufactured using a zeolite inorganic disinfectant content of 10 kg when compounding the internal and external impact hard layers.

<Example 4>

According to the same apparatus and method as in Example 1, a triple wall structured water pipe was prepared, but a triple wall structured water pipe was manufactured using a zeolite inorganic disinfectant content of 12 kg when compounding the internal and external impact hard layers.

Comparative Example

According to the same apparatus and method as in Example 1, a triple wall structured water pipe was manufactured, but instead of a zeolite inorganic antimicrobial as a disinfectant component as a compound of the internal and external impact hard layers, flanarom (May & Baker.Co.) The water pipe of the triple wall structure was manufactured using the thing which added 5 kg of Planarome).

Experimental Example 1

Tensile strength and low temperature impact test

Tensile strength and low temperature impact tests were conducted on the water pipes manufactured according to Examples 1 to 4 and Comparative Examples, and the impact test of the impact resistant hard vinyl chloride pipe (HIVP) of KS M 3401 and the KS M 3401 Annex 1 was conducted. Measured by the test method is shown in Table 1 below.

division Tensile Strength (㎏f / ㎠) Low temperature impact strength (Nm) Example 1 552 22 Example 2 550 20 Example 3 543 19 Example 4 530 17 Comparative example 505 13

As shown in Table 1, in the case of Examples 1 to 4 produced using a zeolite inorganic antimicrobial agent as a disinfectant component, it was produced using the organic antimicrobial agent shown in the conventional plastics field or Korean Patent No. 232263 filed by the inventor. Compared with the comparative example, it can be confirmed that the tensile strength and the low temperature impact strength can be much improved, and since the conventional organic antimicrobial agent is weak to heat and the compounding process is performed at low temperature, it is difficult to uniformly mix each component at low viscosity. Although the mechanical properties are degraded by oxidizing heat or reacting with other additives during the molding process, the zeolite inorganic antimicrobial agent has a high tensile strength and low temperature impact strength by acting as a filler to increase the impact strength by improving dispersibility. .

Experimental Example 2

Pipe deposition test

The antimicrobial impact water pipe 100m / m and the cast iron pipe 100m / m produced by Example 3 were installed by fastening each 10m each and then connected with a water pipe for 5 minutes per day, followed by the 7th, 14th, 21st, and 28th. Primary tube walls were taken with an optical microscope (150x) and shown in FIGS. 2 and 3, respectively. Optical microscopic images (× 150) of scale on cast iron water pipe: (a) initial blank; (b) after 7days; (c) after 14days; (d) after 28days]

As shown in the attached photograph of FIG. 2, the impact-resistant water pipe of Example 3 to which the antimicrobial function was added, hardly found scale deposited on the wall of the tube even after 28 days had elapsed. Likewise, in the case of general cast iron pipes, the scale deposited on the wall of the pipe rapidly increases with time.

Experimental Example 3

Antimicrobial Test

Two test pieces were cut from the antibacterial impact water pipe produced in Example 3 to a length of 5 cm × 6 cm, respectively, and two control pieces of the same size were made from a general PVC water pipe. The antimicrobial test by press-contact method was carried out using E. coli ( Esherichia coli 25922 ) as a strain for the control and the specimens were tested by the Korea Yarn Textile Testing Institute. The results are shown in Table 2 and FIG. At this time, the cultivation of the test bacteria was transplanted into a 10 ml broth prepared earlier using a 4 mm loop and incubated at 37 ° C. for 24 hours.

The antimicrobial activity of the test piece and the control piece is expressed as the number of bacteria or the reduction rate, and unless otherwise specified, the average value of the results obtained by taking two test pieces for each test strain is indicated by two significant figures for each test specimen. And The test results are shown in Table 2 by measuring the reduction rate by the following equation (1).

Test Items unit Test result (a) (b) (c) Antimicrobial test (Pressure bonding method) Right after contact Bacteria count / ml 6.2 x 10 ³ 6.2 x 10 ³ 6.2 x 10 ³ 24 hours later Bacteria count / ml 2.6 x 10 ⁵ 2.5 x 10 ³ 1.3 x 10 ³ Reduction rate % - 3.8 99.5

{(a); Blank, (b); General PVC water pipe without antibacterial agent, (c); Impact resistant water pipe with 1 part by weight of antibacterial agent}

As shown in Table 2 and Figure 4 attached, the shock-resistant water pipe (c) of Example 3 to which the antibacterial function was added that the number of bacteria was surely reduced compared to the test sample (a) after 24 hours Although it could be confirmed, in general PVC water pipe (b), the number of bacteria was confirmed that there is almost no change compared to the blank (a).

In addition, the antimicrobial test was carried out in the same manner as described above for the other examples, in which Example 1 added 0.5 parts by weight of the zeolite inorganic antimicrobial agent, a reduction ratio of 75 to 80% was added. In Examples 2 to 4, the average reduction rate was 99% or more. However, in consideration of the dispersibility limit it can be seen that a perfect antimicrobial effect can be achieved within the range of Example 3 to which 1.0 parts by weight of inorganic antimicrobial agent is added. Therefore, as in Example 4, it could be confirmed that it is not necessary to add an expensive inorganic antibacterial agent by 1.2 parts by weight or more.

As described above, the triple wall structure impact resistant water pipe to which the antibacterial function is added is applied to the external and internal impact hard layers of the triple wall water pipe by applying a resin composition containing a zeolite inorganic antimicrobial agent, thereby preventing the incubation of microorganisms. In addition, excellent tensile strength and low temperature impact strength can be obtained due to the structural characteristics of the triple wall.

In addition, the present invention can improve the adhesion between the central high tensile hard layer and the external and internal impact hard layer to prevent the impact strength is lowered, and the blending process of each component in the work process can also be made at high viscosity at high temperatures Uniform mixing of each component is possible, workability can be improved, and antibacterial effect can be maintained continuously.

Claims (11)

In an impact resistant water pipe made of a vinyl chloride resin having an inner impact hard layer, a central high tensile hard layer, and an outer impact hard layer having a triple wall structure, The vinyl chloride resin composition forming the internal and external impact hard layers is a resin composition containing a zeolite-based inorganic antibacterial agent as an antistatic agent, a heat stabilizer and a bactericide component, The polyvinyl chloride resin composition constituting the central high tensile hard layer is a triple wall structure impact resistant water pipe with an antibacterial function, characterized in that the resin composition is harder than the vinyl chloride resin composition of the inner and outer impact hard layers. The triple wall structure impact resistant water pipe of claim 1, wherein the zeolite inorganic antimicrobial agent is added in an amount of 0.8 to 1.0 parts by weight based on 100 parts by weight of the vinyl chloride resin. The antistatic agent according to claim 1 or 2, wherein the antistatic agent is selected from cationic surfactants of quaternary ammonium salt type, quaternary ammonium resin type, or imidazoline type, and is 1 to 1.5 weight parts based on 100 parts by weight of vinyl chloride resin. Triple wall structure impact resistant water pipe with an antibacterial function, characterized in that the addition is added. The method of claim 3, wherein the thermal stabilizer is Ca-st [Ca (C ₁₇ H ₃₅ COO) ₂ ], Zn-st [Zn (C ₁₇ H ₃₅ COO) ₂ ] or Tin-Raulate (Tin-Raulate) system and Tin-Mate-based liquid stabilizer is composed of a single or a mixture, the anti-bacterial function triple wall structure shock water pipe is added, characterized in that 3.5 to 4.5 parts by weight based on 100 parts by weight of vinyl chloride resin. The method of claim 4, wherein the vinyl chloride resin used for the outer impact hard layer and the inner impact hard layer has a polymerization degree of 800 to 1000, the vinyl chloride resin used for the central high tensile hard layer has a polymerization degree of 1000 to 1200. Triple wall structure impact water pipe with antibacterial function. According to claim 5, Chlorinated polyethylene (CPE-based) impact modifier for the outer impact hard layer and inner impact hard layer, Polymethylmethacrylate Butadien-styrene (Polymethylmethacrylate Butadien Styrene) in the central high tensile hard layer , MBS-based triple wall structure impact water pipe with antibacterial function, characterized in that 5 to 10 parts by weight of the impact modifier is added to 100 parts by weight of vinyl chloride resin, respectively. In a triple wall water pipe comprising an inner and outer impact hard layer mainly composed of vinyl chloride resin having the same properties, and a central high tensile rigid layer containing a vinyl chloride resin harder than the inner and outer impact hard layers. The internal and external impact hard layers are prepared by mixing the zeolite inorganic antimicrobial agent with 0.8 to 1.0 parts by weight and 0.4 to 0.5 parts by weight of a sunscreen and heat blending at a temperature of 90 to 100 ° C. A second step of mixing the compound with 1 to 1.5 parts by weight of an antistatic agent, 3.5 to 4.5 parts by weight of a nontoxic heat stabilizer, an appropriate amount of a lubricant and a processing aid, and cooling the mixture to 58 to 62 ° C .; An antimicrobial function comprising a resin composition prepared by the third step of mixing 100 parts by weight of polyvinyl chloride with an appropriate amount of an impact modifier and a filler to heat-mix at 125 to 135 ° C, and then cool the mixture to 40 ° C or less. This added triple wall structure impact water pipe. 8. The triple wall structure impact water pipe according to claim 7, wherein the antistatic agent is a cationic surfactant of quaternary ammonium salt type, quaternary ammonium resin type, or imidazorin type. The method according to claim 7 or 8, wherein the heat stabilizer is Ca-st [Ca (C ₁₇ H ₃₅ COO) ₂ ], Zn-st [Zn (C ₁₇ H ₃₅ COO) ₂ ] or Tin-Raulate A triple wall structured impact water pipe with an antibacterial function, characterized in that it is a single or a mixture of a liquid stabilizer of a) and a tin-late system. The method of claim 9, wherein the vinyl chloride resin used for the outer impact hard layer and the inner impact hard layer has a polymerization degree of 800 to 1000, the vinyl chloride resin used for the central high tensile hard layer has a polymerization degree of 1000 to 1200. Triple wall structure impact water pipe with antibacterial function. The method of claim 10, wherein the outer shock-resistant layer and the inner shock-resistant layer is a chlorinated polyethylene (CPE-based) impact modifier, the central high-tension hard layer is polymethylmethacrylate-butadiene-styrene (Polymethylmethacrylate Butadien Styrene , MBS-based triple wall structure impact water pipe with an antibacterial function, characterized in that 5 to 10 parts by weight of the impact modifier is added to 100 parts by weight of vinyl chloride resin, respectively.

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