Preparation method of light rubber sole

Abstract

The invention discloses a light rubber sole preparation method, which comprises: 1, adding 20-30 parts of chlorosulfonated polyethylene acid rubber (CSM), 20-30 parts of TPE 004 type, 15-20 parts of EVA 3330, 10-15 parts of OBC 9107, 8-10 parts of ethylene propylene diene monomer (EPDM) 3745, 4-6 parts of a wear-resistant agent, 0.3-0.5 part of stearic acid, 0.3-0.5 part of a bridging auxiliary agent, and 0.5-0.8 part of a cross-linking agent into an internal mixer according to a formula ratio, mixing at a temperature of 110-120 DEG C, and granulating to obtain a material grain; and step 2, then adding the material grains into an injection molding machine for one-time injection molding at the molding temperature of 165-175 DEG C, and heating for 120-180 seconds to obtain the light rubber sole. According to the preparation method of the light rubber sole, the method is simple, the prepared light rubber sole is light in specific gravity and good in non-slip performance, and meanwhile the defects that a traditional rubber sole is prone to cracking, abrasion and frosting are overcome.

Description

Technical Field

[0001] The invention relates to the field of sole materials, and in particular to a method for preparing a lightweight rubber sole. Background Art

[0002] As people's requirements for the performance of footwear products continue to increase, the research and development and production technology of rubber soles have been continuously improved. Rubber soles are usually made of rubber materials, such as natural rubber, synthetic rubber, etc., as well as various fillers and additives, such as carbon black, plasticizers, vulcanizers, etc., through mixing, calendering, molding, vulcanization and other processes, so the process flow is relatively complicated.

[0003] Moreover, the current rubber soles still have some difficult-to-overcome quality problems. First, traditional rubber soles are prone to cracking, wear and frost during use, which affects the durability of the soles. Secondly, some rubber soles have a low friction coefficient and poor anti-skid properties, which can easily lead to safety problems such as slipping. Finally, rubber has a high specific gravity and lacks portability. Therefore, traditional rubber soles have been unable to meet people's many requirements for sole performance. Summary of the invention

[0004] The purpose of the present invention is to provide a method for preparing a lightweight rubber sole. The method is simple, and the prepared lightweight rubber sole has a light specific gravity and good anti-slip performance, while overcoming the defects of traditional rubber soles that are prone to cracking, wear and frost.

[0005] In order to achieve the above object, the solution of the present invention is: A method for preparing a lightweight rubber sole comprises the following steps: Step 1: According to the formula ratio, 20-30 parts of chlorosulfonated polyvinyl acid rubber (CSM), 20-30 parts of TPE 004, 15-20 parts of EVA 3330, 10-15 parts of OBC 9107, 8-10 parts of ethylene propylene diene monomer (EPDM) 3745, 4-6 parts of wear-resistant agent, 0.3-0.5 parts of stearic acid, 0.3-0.5 parts of bridging agent and 0.5-0.8 parts of cross-linking agent are added into an internal mixer, and mixed and granulated at 110-120° C. to obtain a raw material; Step 2: then add the raw rice into an injection molding machine for one-time injection molding, the molding temperature is 165-175° C., and the heating is performed for 120-180 s to obtain the lightweight rubber sole.

[0006] In step 1, the wear-resistant agent includes 35 wt %~45 wt % Polyethylene, 3 wt %~5 wt % fumed silica and 45wt%~50 wt% dimethyl vinyl MQ silicone rubber.

[0007] In step 1, the bridging auxiliary agent is triallyl isocyanurate (TAIC).

[0008] In step 1, the cross-linking agent is 2,4-di-tert-butylcumene peroxide (BIBP).

[0009] After adopting the above technical scheme, the preparation method of the lightweight rubber sole of the present invention selects 20-30 parts of chlorosulfonated polyvinyl rubber (CSM), 20-30 parts of TPE 004, 15-20 parts of EVA 3330, 10-15 parts of OBC 9107, and 8-10 parts of ethylene propylene rubber (EPDM) 3745 as raw materials, wherein chlorosulfonated polyvinyl rubber (GSM) is a chlorine-containing special elastomer with a highly saturated chemical structure, a special rubber, good anti-aging performance, good chemical corrosion resistance, heat resistance, cold resistance, oil resistance, wear resistance, and good insulation; TPE 004 is selected, which is a thermoplastic elastomer, which is more heat-resistant and weather-resistant than traditional thermoplastic elastomers, has good resilience, good recovery creep, and excellent folding resistance and cold resistance; EVA is selected 3330 (Taiwan Polymer) has a high VA content and uses EVA with a high melt index as a small amount of auxiliary material to solve the problems of poor fluidity and poor exhaust properties in mechanical processing. It has excellent qualities such as easy processing, easy operation and easy production, and has a light specific gravity. Dow 9107, an olefin block copolymer (OBC), is selected. It is an olefin copolymer with alternating soft segments and hard segments prepared by polymerization of octene and ethylene. Due to its multi-block molecular structure, it has a higher melting point and a lower glass transition temperature, a fast crystallization rate, high tensile strength, and excellent performance. The soft segment chain produces toughness and elasticity, and the production of the hard segment chain is particularly important for the small dimensional changes in thermoplastic elastomer products. EPDM is selected, which is composed of chemically stable saturated hydrocarbons on the main chain and only contains unsaturated double bonds in the side chain. It has excellent ozone resistance, heat resistance, weather resistance and aging resistance, is easy to process, and has strong plasticity. In particular, it significantly overcomes the variations in color cracking and yellowing resistance in traditional rubber products.

[0010] On the basis of selecting the appropriate raw materials mentioned above, the present invention adopts a one-time injection molding method with thermoplastic raw materials, does not require foaming, and does not require vulcanization. The process is simple, and the prepared lightweight rubber sole is translucent, resistant to yellowing, light in specific gravity, and has good anti-slip performance. At the same time, it overcomes the defects of traditional rubber soles that are prone to cracking, wear and frost. DETAILED DESCRIPTION

[0011] In order to further explain the technical solution of the present invention, the present invention is described in detail below through specific embodiments.

[0012] Example 1 A method for preparing a lightweight rubber sole comprises the following steps: Step 1: According to the formula ratio, 20 parts of CSM, 20 parts of TPE 004, 15 parts of EVA 3330, 10 parts of OBC9107, 8 parts of EPDM 3745, 4 parts of anti-wear agent, 0.3 parts of stearic acid, 0.3 parts of bridging aid TAIC and 0.5 parts of cross-linking agent BIBP are added into an internal mixer, mixed and granulated at 110° C. to obtain rice; Step 2: then add the raw rice into an injection molding machine for one-time injection molding, the molding temperature is 165° C., and heating is performed for 120 s to obtain the lightweight rubber sole.

[0013] Example 2 A method for preparing a lightweight rubber sole comprises the following steps: Step 1: According to the formula ratio, 30 parts of CSM, 30 parts of TPE 004, 20 parts of EVA 3330, 15 parts of OBC9107, 10 parts of EPDM 3745, 6 parts of anti-wear agent, 0.5 parts of stearic acid, 0.5 parts of bridging aid TAIC and 0.8 parts of cross-linking agent BIBP are added into an internal mixer, mixed and granulated at 115° C. to obtain rice; Step 2: then add the raw rice into an injection molding machine for one-time injection molding at a molding temperature of 170° C. and heat for 150 s to obtain the lightweight rubber sole.

[0014] Example 3 A method for preparing a lightweight rubber sole comprises the following steps: Step 1: According to the formula ratio, 30 parts of CSM, 30 parts of TPE 004, 20 parts of EVA 3330, 15 parts of OBC9107, 10 parts of EPDM 3745, 6 parts of anti-wear agent, 0.5 parts of stearic acid, 0.5 parts of bridging aid TAIC and 0.8 parts of cross-linking agent BIBP are added into an internal mixer, mixed and granulated at 120° C. to obtain rice; Step 2: then add the raw rice into an injection molding machine for one-time injection molding, the molding temperature is 175° C., and heating is performed for 180 s to obtain the lightweight rubber sole.

[0015] In the above embodiment, the brand of CSM is Jihua Hypalon 3305, the brand of TPE 004 is Formosa Plastics 004, the brand of EVA3330 is Taiju UE 3330, the brand of OBC 9107 is Dow 9107, the brand of EPDM 3745 is Dow 3745, and the wear-resistant agent includes 35 wt %~45 wt % Polyethylene, 3 wt %~5 wt% fumed silica and 45 wt%~50 wt% dimethyl vinyl MQ silicone rubber, brand N043A, can significantly improve the wear resistance of footwear products, reduce wear by more than 60%, have a low friction coefficient, good flow properties, and make the surface gloss of the sole good.

[0016] The lightweight rubber sole prepared in Example 3 and the ordinary rubber sole (including isoprene rubber IR80, styrene butadiene rubber SBR1502, and butadiene rubber BR9000) were tested for performance according to the national footwear standards. The results are shown in Table 1.

[0017] Compared with ordinary rubber soles, the lightweight rubber soles prepared by the present invention are wear-resistant, yellowing-resistant, light in specific gravity, better in anti-slip performance, and can maintain the same level of tensile strength and hardness.

[0018] Table 1 Performance test comparison of rubber soles

[0019] The above embodiments do not limit the product form and style of the present invention. Any appropriate changes or modifications made by ordinary technicians in the relevant technical field should be deemed to be within the patent scope of the present invention.

Claims

1. A method for preparing a lightweight rubber sole, characterized in that: The following steps are involved: Step 1, according to the formula ratio, first add 20-30 parts of chlorosulfonated polyvinyl acid rubber, 20-30 parts of TPE 004, 15-20 parts of EVA 3330, 10-15 parts of OBC 9107, 8-10 parts of EPDM 3745, 4-6 parts of wear-resistant agent, 0.3-0.5 parts of stearic acid, 0.3-0.5 parts of bridging aid and 0.5-0.8 parts of cross-linking agent into an internal mixer, mix and granulate at 110-120° C. to obtain rice; Step 2: then adding the raw rice into an injection molding machine for one-time injection molding, the molding temperature is 165-175° C., and heating is performed for 120-180 s to obtain the lightweight rubber sole.

2. The method for preparing a lightweight rubber sole according to claim 1, characterized in that: In step 1, the wear-resistant agent includes 35 wt %~45 wt % Polyethylene, 3 wt %~5 wt % fumed silica and 45 wt%~50 wt% dimethyl vinyl MQ silicone rubber.

3. The method for preparing a lightweight rubber sole according to claim 1, characterized in that: In step 1, the bridging auxiliary agent is triallyl isocyanurate.

4. The method for preparing a lightweight rubber sole according to claim 1, characterized in that: In step 1, the cross-linking agent is 2,4-di-tert-butyl cumene peroxide.

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