PVC sole material for safety shoes and manufacturing method of PVC sole material

Abstract

The invention relates to a PVC sole material for safety shoes. The PVC sole material comprises the following components in parts by weight: 100 parts of polyvinyl chloride resin, 50-100 parts of a main plasticizer, 0-15 parts of an aliphatic diacid ester plasticizer, 5-10 parts of epoxy fatty acid methyl ester, 2-5 parts of a heat stabilizer, 15-30 parts of powdered nitrile rubber, 10-20 parts of liquid nitrile rubber, 1-3 parts of a composite antistatic agent and 2-5 parts of a long-acting antistatic agent. The invention also relates to a manufacturing method of the PVC sole material for the safety shoes, which comprises the following steps: adding the components except the powdered nitrile rubber into a kneading machine according to the formula proportion, starting stirring and heating until the ingredients are uniformly mixed and the plasticizer is completely absorbed, adding the powdered nitrile rubber, continuously stirring at a high speed to uniformly mix the materials, and cooling to obtain the PVC sole material for the safety shoes. And discharging the material and conveying the material to an extrusion granulator for extrusion granulation. When the PVC material disclosed by the invention is used for processing and manufacturing soles, all aspects can meet the performance requirements of safety shoes.

Description

Technical Field

[0001] The invention belongs to the technical field of safety shoe sole materials, and in particular relates to a PVC sole material for safety shoes and a manufacturing method thereof. Background Art

[0002] Safety shoes are special shoes that protect the wearer from injuries caused by accidents, have protective features and protect the safety of the work area, and have specific requirements for anti-static, anti-slip, oil resistance and wear resistance. Therefore, the soles of safety shoes are generally made of rubber materials such as nitrile rubber. Polyvinyl chloride (PVC) has a low price, good transparency, high weather resistance and corrosion resistance, and can be modified with plasticizers to produce a soft elastic material similar to rubber, which is widely used in the manufacture of ordinary soles.

[0003] CN103275422A discloses that by adding 2-5% S-18 (a composite antistatic agent composed of a cationic quaternary ammonium salt surfactant, a nonionic surfactant and a dispersant), the PVC material can obtain excellent antistatic properties. However, the addition of S-18 will have an adverse effect on the anti-slip property of the sole, and the transparent soft PVC material used for the sole of safety shoes must not only meet the performance requirements of antistatic properties (also known as antistatic properties), but also meet the performance requirements of anti-slip properties, wear resistance and oil resistance.

[0004] The antistatic property, anti-skid property, wear resistance and oil resistance of the transparent soft PVC material disclosed in the prior art cannot simultaneously meet the performance requirements of the soles of safety shoes. Summary of the invention

[0005] In order to overcome the above shortcomings of the prior art, the object of the present invention is to provide a PVC sole material for safety shoes, which can simultaneously meet the antistatic, anti-slip, wear resistance and oil resistance required by safety shoes.

[0006] Another object of the present invention is to provide a method for manufacturing a PVC sole material for safety shoes.

[0007] The purpose of the present invention is achieved through the following technical solutions: A PVC sole material for safety shoes, comprising the following components in parts by weight: 100 parts of polyvinyl chloride resin; Main plasticizer 50~100 parts; Epoxy fatty acid methyl ester 5-10 parts; 2~5 parts of heat stabilizer; 15-30 parts of powdered nitrile rubber; 10-20 parts of liquid nitrile rubber; 1~3 parts of composite antistatic agent; 2~5 parts of long-lasting antistatic agent.

[0008] Preferably, the primary plasticizer includes di(2-ethylhexyl) phthalate, dibutyl phthalate, di(2-ethylhexyl) terephthalate, tributyl citrate or acetyl tributyl citrate.

[0009] Preferably, the aliphatic diacid ester plasticizer is di(2-ethylhexyl) adipate or di(2-ethylhexyl) sebacate.

[0010] Preferably, the heat stabilizer is a liquid calcium zinc heat stabilizer or a liquid barium zinc heat stabilizer.

[0011] Preferably, the composite antistatic agent is a composite antistatic agent of a quaternary ammonium salt antistatic agent and a nonionic antistatic agent.

[0012] Preferably, the long-acting antistatic agent is a polyether antistatic agent.

[0013] A method for manufacturing a PVC sole material for safety shoes comprises the following steps: (1) Add the components except the powdered nitrile rubber into the kneader according to the formula ratio, start stirring and heat to 100-120°C to ensure that the ingredients are evenly mixed and the plasticizer is completely absorbed; (2) adding powdered nitrile rubber to the material obtained in step (1), continuing to stir at high speed for 10 to 20 minutes to mix the materials evenly, and then discharging the obtained material; (3) The material obtained in step (2) is sent to an extrusion granulator for extrusion granulation to obtain a PVC sole material.

[0014] The present invention has the following advantages and beneficial effects compared with the prior art: (1) Based on the fact that partial replacement of the composite antistatic agent with a long-lasting antistatic agent can effectively reduce the adverse effect of the antistatic agent on the anti-slip property due to precipitation without significantly affecting the antistatic performance, and the combined use of powdered nitrile rubber and liquid nitrile rubber can synergistically and effectively improve the anti-slip property, wear resistance and oil resistance, the soles manufactured using the PVC sole material for safety shoes disclosed in the present invention can meet the performance requirements of safety shoes in terms of antistatic property, anti-slip property, wear resistance and oil resistance.

[0015] (2) Based on the fact that adding aliphatic diacid ester plasticizers can effectively improve the cold resistance without significantly affecting the antistatic properties, anti-slip properties, wear resistance and oil resistance, the technology disclosed in the present invention can be used to adjust the amount of aliphatic diacid ester plasticizers to produce PVC sole materials for safety shoes suitable for different cold resistance requirements.

[0016] (3) The method for manufacturing the PVC sole material for safety shoes disclosed in the present invention can be used to manufacture the PVC sole material for safety shoes disclosed in the present invention using conventional soft PVC granulation processing equipment, and has universal applicability. DETAILED DESCRIPTION

[0017] The purpose of the present invention is further described in detail below in conjunction with specific examples. The examples cannot be described one by one here, but the implementation mode of the present invention is not therefore limited to the following examples.

[0018] Example 1 A PVC sole material for safety shoes, comprising the following components in parts by weight: 100 parts of polyvinyl chloride resin; 75 parts of di(2-ethylhexyl) phthalate; Epoxy fatty acid methyl ester 8 parts; Liquid calcium zinc heat stabilizer EO-207 a 4 servings; Powdered nitrile rubber NBR-3604 b 20 points; Liquid Nitrile Rubber RB-302 c 15 servings; Composite antistatic agent DC-30 d 2 servings; Long-lasting antistatic agent E-105 e 3 servings.

[0019] The above-mentioned PVC sole material for safety shoes is manufactured according to the following process: (1) Add the components except the powdered nitrile rubber into the kneader according to the formula ratio, start stirring and heat to 120°C to make the ingredients evenly mixed and the plasticizer completely absorbed to obtain a mixture; (2) Add powdered nitrile rubber to the mixture in step (1), continue stirring at high speed for 10 minutes to make the materials uniformly mixed, then discharge the materials and send them to an extrusion granulator for extrusion granulation to obtain PVC sole material.

[0020] Note: a. Produced by Guangzhou Jiyuan Technology Co., Ltd., b. Produced by Lanzhou Petrochemical Company, c. Produced by Lanzhou Petrochemical Company, d. Produced by Foshan Jingding Plastic Chemical Co., Ltd., e. Produced by Dongguan Fiat Electrostatic Technology Co., Ltd.

[0021] Example 2 The technical solution is basically the same as that of Example 1, except that 5 parts of di(2-ethylhexyl) sebacate are added to the material components.

[0022] Example 3 The technical solution is basically the same as that of Example 1, except that 75 parts of di(2-ethylhexyl) phthalate in the material component are replaced by 80 parts of di(2-ethylhexyl) terephthalate.

[0023] Example 4 The technical solution is basically the same as that of Example 1, except that 75 parts of di(2-ethylhexyl) phthalate in the material component are replaced by 80 parts of acetyl tributyl citrate.

[0024] The PVC material obtained by the technical solutions of Examples 1 to 4 was used to process and manufacture the soles. The test results of the antistatic property, anti-skid property, oil resistance, wear resistance and cold resistance are shown in Table 1.

[0025] Table 1 shows the test results of antistatic, antiskid, oil resistance, wear resistance and cold resistance of the soles obtained by processing the PVC materials prepared in Examples 1-4. As can be seen from Table 1, the antistatic, antiskid, wear resistance and oil resistance of the soles processed by the PVC materials prepared by the technology of the present invention in Examples 1-4 can meet the performance requirements of safety shoes.

Claims

1. A PVC sole material for safety shoes, characterized in that: By weight, it includes the following components: 100 parts of polyvinyl chloride resin; Main plasticizer 50~100 parts; Aliphatic diacid ester plasticizer 0.1~15 parts; Epoxy fatty acid methyl ester 5-10 parts; 2~5 parts of heat stabilizer; 15-30 parts of powdered nitrile rubber; 10-20 parts of liquid nitrile rubber; 1~3 parts of composite antistatic agent; 2~5 parts of long-lasting antistatic agent.

2. The PVC sole material for safety shoes according to claim 1, characterized in that: The primary plasticizer includes di(2-ethylhexyl) phthalate, dibutyl phthalate, di(2-ethylhexyl) terephthalate, tributyl citrate or acetyl tributyl citrate.

3. The PVC sole material for safety shoes according to claim 1, characterized in that: The aliphatic diacid ester plasticizer is di(2-ethylhexyl) adipate or di(2-ethylhexyl) sebacate.

4. The PVC sole material for safety shoes according to claim 1, characterized in that: The heat stabilizer is a liquid calcium zinc heat stabilizer or a liquid barium zinc heat stabilizer.

5. The PVC sole material for safety shoes according to claim 1, characterized in that: The composite antistatic agent is a composite antistatic agent formed by compounding a quaternary ammonium salt antistatic agent and a nonionic antistatic agent.

6. The PVC sole material for safety shoes according to claim 1, characterized in that: The long-acting antistatic agent is a polyether antistatic agent.

7. The method for manufacturing the PVC sole material for safety shoes according to any one of claims 1 to 6, characterized in that: The following steps are involved: (1) Add the components except the powdered nitrile rubber into the kneader according to the formula ratio, start stirring and heat to 100-120°C to ensure that the ingredients are evenly mixed and the plasticizer is completely absorbed; (2) adding powdered nitrile rubber to the material obtained in step (1), continuing to stir at high speed for 10 to 20 minutes to mix the materials evenly, and then discharging the obtained material; (3) The material obtained in step (2) is sent to an extrusion granulator for extrusion granulation to obtain a PVC sole material.

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