A method for preparing a light-weight rubber sole

Abstract

The application discloses a preparation method of a light rubber sole, and comprises the following steps: step 1, according to a formula proportion, 20-30 parts of chlorosulfonated polyethylene 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 rubber (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 crosslinking agent are added into a mixing mill, mixing and granulating at 110-120 DEG C to obtain material rice; and step 2, the material rice is added into an injection molding machine to be one-time injection molded, the molding temperature is 165-175 DEG C, and heating is performed for 120-180 s to obtain the light rubber sole. The preparation method of the light rubber sole is simple, the light rubber sole prepared has a light specific gravity, has good skid resistance, and overcomes the defects that the traditional rubber sole is prone to cracking, wearing and frost discharge.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of shoe sole material, in particular to a preparation method of light rubber shoe sole. BACKGROUND

[0002] With the increasing demand for the performance of shoe products, the research and production technology of rubber soles has been continuously improved. Rubber soles are usually made of rubber materials such as natural rubber, synthetic rubber, etc., and various fillers and additives such as carbon black, plasticizer, vulcanizing agent, etc., through mixing, calendering, molding, vulcanization and other processes, so the process flow is relatively complex.

[0003] Moreover, there are still some quality problems in the current rubber soles that are difficult to overcome. First of all, traditional rubber soles are prone to cracking, wear and tear and frost during use, which affects the durability of the soles. Secondly, the friction coefficient of some rubber soles is low, which is not good for stopping and can easily lead to safety problems such as slipping. Finally, the specific gravity of rubber is high, which lacks lightness. Therefore, traditional rubber soles have been difficult to meet the many requirements of people for the performance of soles. SUMMARY

[0004] The purpose of the present application is to provide a preparation method of light rubber shoe sole, which is simple, light in specific gravity, and has good slip resistance, while overcoming the defects of traditional rubber soles such as cracking, wear and tear and frost.

[0005] In order to achieve the above purpose, the solution of the present application is:

[0006] A preparation method of light rubber shoe sole, comprising the following steps:

[0007] Step 1, according to the formula proportion, first put 20-30 parts of chlorosulfonated polyethylene 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 rubber (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 crosslinking agent into a mixer, and mix and granulate at 110-120℃ to obtain material rice;

[0008] Step 2, then put the material rice into an injection molding machine for one-shot molding, the molding temperature is 165-175℃, and the heating time is 120-180s, to obtain the light rubber shoe sole.

[0009] In step 1, the wear-resistant agent includes 35 wt %~45 wt % polyethylene, 3 wt %~5 wtfumed silica and 45 wt% to 50 wt% dimethylvinyl MQ silicone rubber.

[0010] In step 1, the bridging aid is triallyl isocyanurate (TAIC).

[0011] In step 1, the crosslinking agent is 2,4-di-tert-butylperoxyisopropyl benzene (BIBP).

[0012] After the above technical solution, the preparation method of the light rubber sole selects 20-30 parts of chlorosulfonated polyethylene 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. The chlorosulfonated polyethylene rubber (GSM) is a special elastomer containing chlorine with a high saturated chemical structure. It has good anti-aging performance, good chemical corrosion resistance, temperature resistance, cold resistance, oil resistance, wear resistance, and good insulation. TPE 004 is a thermoplastic elastomer that is more heat-resistant and weather-resistant than traditional thermoplastic elastomers. It has good resilience, good creep recovery, excellent folding and cold resistance. EVA 3330 (Taiwan polyethylene) has a high VA content and a high melt index. It is used as a small amount of auxiliary material to solve the problems of poor flowability and air exhaust during mechanical processing. It has the advantages of easy processing, easy operation, and easy production, and has a light specific gravity. Dow 9107 is an olefin block copolymer (OBC) prepared by polymerizing octene and ethylene to produce soft and hard segments that alternate with each other. Due to its multi-block molecular structure, it has a higher melting temperature and a lower glass transition temperature. It has a fast crystallization rate, high tensile strength, and excellent performance. The soft segment chain produces tough elasticity, and the hard segment chain is particularly important for maintaining the size of thermoplastic elastomer products. EPDM is composed of chemically stable saturated hydrocarbons in the main chain and contains unsaturated double bonds only in the side chain. It has excellent ozone resistance, heat resistance, weather resistance, and aging resistance. It is easy to process and has strong plasticity. In particular, it significantly overcomes the color cracking and yellowing resistance variation of traditional rubber products.

[0013] Based on the selection of the above-mentioned raw materials, the present application adopts a one-shot injection molding method, which is combined with thermoplastic raw materials, and does not need to be foamed or vulcanized. The process is simple, and the light rubber sole obtained is translucent, yellowing-resistant, light in weight, and has good slip resistance. It also overcomes the defects of traditional rubber soles such as cracking, wear and frost. DETAILED DESCRIPTION

[0014] In order to further explain the technical solutions of the present application, the present application will be described in detail through specific examples.

[0015] Example 1

[0016] A preparation method of a light rubber sole, comprising the following steps:

[0017] Step 1, according to the formula proportion, first 20 parts of CSM, 20 parts of TPE 004 type, 15 parts of EVA 3330, 10 parts of OBC9107, 8 parts of EPDM 3745, 4 parts of wear-resistant agent, 0.3 parts of stearic acid, 0.3 parts of bridging aid TAIC and 0.5 parts of crosslinking agent BIBP are added into the internal mixer, mixed at 110℃, granulated, and the material rice is obtained;

[0018] Step 2, then the material rice is added into the injection molding machine for one-time injection molding, the molding temperature is 165℃, and the heating time is 120 s, and the light rubber sole is obtained.

[0019] Example 2

[0020] A preparation method of a light rubber sole, comprising the following steps:

[0021] Step 1, according to the formula proportion, first 30 parts of CSM, 30 parts of TPE 004 type, 20 parts of EVA 3330, 15 parts of OBC9107, 10 parts of EPDM 3745, 6 parts of wear-resistant agent, 0.5 parts of stearic acid, 0.5 parts of bridging aid TAIC and 0.8 parts of crosslinking agent BIBP are added into the internal mixer, mixed at 115℃, granulated, and the material rice is obtained;

[0022] Step 2, then the material rice is added into the injection molding machine for one-time injection molding, the molding temperature is 170℃, and the heating time is 150 s, and the light rubber sole is obtained.

[0023] Example 3

[0024] A preparation method of a light rubber sole, comprising the following steps:

[0025] Step 1, according to the formula proportion, first 30 parts of CSM, 30 parts of TPE 004 type, 20 parts of EVA 3330, 15 parts of OBC9107, 10 parts of EPDM 3745, 6 parts of wear-resistant agent, 0.5 parts of stearic acid, 0.5 parts of bridging aid TAIC and 0.8 parts of crosslinking agent BIBP are added into the internal mixer, mixed at 120℃, granulated, and the material rice is obtained;

[0026] Step 2, then the material rice is added into the injection molding machine for one-time injection molding, the molding temperature is 175℃, and the heating time is 180 s, and the light rubber sole is obtained.

[0027] In the above examples, the trade name of the CSM is Jihua Heparon 3305, the trade name of the TPE 004 is Taizhong 004, the trade name of the EVA 3330 is Taizhong UE 3330, the trade name of the OBC 9107 is Dow 9107, the trade name of the EPDM 3745 is Dow 3745, 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, trade name N043A, can significantly improve the wear resistance of the shoe material product, reduce wear by more than 60%, have low friction coefficient, good flow performance, and make the surface gloss of the shoe sole good.

[0028] The light rubber sole prepared in Example 3 and the ordinary rubber sole (containing isooctane rubber IR80, butadiene styrene rubber SBR1502, cis-butadiene rubber BR9000) were subjected to performance testing according to the national footwear standard, and the results are shown in Table 1.

[0029] Compared with the ordinary rubber sole, the light rubber sole prepared by the present application has better wear resistance, anti-yellowing, light specific gravity, and better slip resistance, and can maintain the same level of tensile strength and hardness.

[0030] Table 1 Performance test comparison of rubber soles

[0031]

[0032] The above examples and drawings are not limited to the product shape and style of the present application, and any appropriate changes or modifications made by those skilled in the art to the present application shall be considered as not departing from the scope of the present application.

Claims

1. A method for preparing a lightweight rubber shoe sole, characterized in that: Includes the following steps: Step 1: According to the formula ratio, first add 20-30 parts of chlorosulfonated polyethylene rubber, 20-30 parts of TPE 004 type, 15-20 parts of EVA 3330, 10-15 parts of OBC 9107, 8-10 parts of EPDM 3745, 4-6 parts of abrasion-resistant agent, 0.3-0.5 parts of stearic acid, 0.3-0.5 parts of crosslinking agent, and 0.5-0.8 parts of crosslinking agent to a mixer, mix and granulate at 110-120℃ to obtain raw material. Step 2: Then add the raw material into the injection molding machine and inject it into the mold in one go. The molding temperature is 165~175℃ and the heating time is 120~180 seconds to obtain the lightweight rubber shoe sole. In step 1, the wear-resistant agent comprises 35 wt %~45 wt % Polyethylene, 3 wt %~5 wt % fumed silica and 45wt%~50wt% dimethylvinyl MQ silicone rubber.

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

3. The method for preparing a lightweight rubber shoe sole according to claim 1, characterized in that: In step 1, the crosslinking agent is 2,4-di-tert-butylperoxyisopropylbenzene.

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