Cold-resistant material as well as preparation method and application thereof

Abstract

The invention discloses a cold-resistant material, which is prepared from the following raw materials in parts by weight: 20 to 25 parts of EVA (Ethylene Vinyl Acetate) with the VA (Vinyl Acetate) content of 28 percent, 15 to 20 parts of EVA with the VA content of 18 percent or 33 percent, 10 to 15 parts of cold-resistant mixture, 15 to 20 parts of POE (Polyolefin Elastomer), 5 to 6 parts of ethylene propylene diene monomer, 6 to 8 parts of wear-resistant agent, 0.3 to 0.5 part of stearic acid, 0.5 to 0.6 part of zinc stearate, 0.8 to 1.0 part of zinc oxide, 0.35 to 0.40 part of bridging agent and 3.0 to 3.2 parts of high-temperature foaming agent, wherein the cold-resistant mixture comprises 50-60 parts of SEBS, 20-30 parts of aliphatic dibasic acid ester, 10-20 parts of EVA with the VA content being 40% and 10-20 parts of naphthenic oil, the content of styrene in the SEBS is 20%, the content of butadiene is 80%, the raw materials are sequentially subjected to mixing, granulation, secondary mixing and secondary granulation, and the cold-resistant material with the good cold resistance is obtained and can be applied to shoe sole manufacturing.

Description

Technical Field

[0001] The invention relates to the technical field of cold-resistant materials, and in particular to a cold-resistant material and a preparation method and application thereof. Background Art

[0002] Due to the rise of outdoor sports, adventure sports and other activities in recent years, as well as regional differences in conditions, new requirements have been put forward for certain special functions of footwear in order to adapt to the needs of extremely harsh low-temperature environments. At present, most outdoor products can only meet the needs of general coldness. In extremely cold conditions, the cold resistance of the soles is required to be higher. However, after ordinary EVA soles are frozen below -15℃ for 24 hours, the hardness will increase by 15~20 degrees. With the increase in hardness, various physical performance indicators such as flexibility will be greatly reduced, affecting the comfort of wearing and even causing the soles to break. Summary of the invention

[0003] The purpose of the present invention is to provide a cold-resistant material and a preparation method thereof, and the prepared cold-resistant material has good cold-resistant performance.

[0004] The present invention also aims to provide a method for making a shoe sole using the cold-resistant material.

[0005] In order to achieve the above object, the solution of the present invention is: A cold-resistant material comprises the following raw materials, measured by weight: 20-25 parts of EVA with a VA content of 28%, 15-20 parts of EVA with a VA content of 18% or 33%, 10-15 parts of a cold-resistant mixture, 15-20 parts of POE, 5-6 parts of EPDM rubber, 6-8 parts of an anti-wear agent, 0.3-0.5 parts of stearic acid, 0.5-0.6 parts of zinc stearate, 0.8-1.0 parts of zinc oxide, 0.35-0.40 parts of a bridging agent and 3.0-3.2 parts of a high-temperature foaming agent, wherein the cold-resistant mixture comprises 50-60 parts of SEBS, 20-30 parts of aliphatic dibasic acid esters, 10-20 parts of EVA with a VA content of 40% and 10-20 parts of cyclohexane oil, the SEBS contains 20% styrene and 80% butadiene.

[0006] The grade of the anti-wear agent is 108P.

[0007] The bridging agent is 2,4-di-tert-butylcumene peroxide (BIBP).

[0008] The grade of the high temperature foaming agent is AC6000.

[0009] The viscosity of the naphthenic oil is 50 mm / s.

[0010] A method for preparing a cold-resistant material comprises the following steps: Step 1: According to the formula ratio, 50-60 parts of SEBS, 20-30 parts of aliphatic dibasic acid ester, 10-20 parts of EVA and 10-20 parts of naphthenic oil are put into an internal mixer, and mixed at 120-125° C. for 8-10 min to obtain a mixture A; Step 2, then putting the mixed material A into a granulator for granulation to obtain a cold-resistant mixture; Step 3, then according to the formula ratio, 20-25 parts of EVA with a VA content of 28%, 15-20 parts of EVA with a VA content of 18% or 33%, 10-15 parts of cold-resistant mixture, 15-20 parts of POE, 5-6 parts of EPDM rubber, 6-8 parts of wear-resistant agent, 0.3-0.5 parts of stearic acid, 0.5-0.6 parts of zinc stearate, 0.8-1.0 parts of zinc oxide, 0.35-0.40 bridging agent and 3.0-3.2 parts of high-temperature foaming agent are put into the internal mixer again, and mixed at 120-125°C for 2-3 min to obtain mixture B; Step 4: Finally, the mixed material B is put into a granulator for granulation to obtain the cold-resistant material.

[0011] The cold-resistant material is used for making the sole, and the sole is made by subjecting the cold-resistant material to compression foaming and shaping.

[0012] After adopting the above technical scheme, a cold-resistant material of the present invention is added with a cold-resistant mixture in the raw material, and the cold-resistant mixture includes 50-60 parts of SEBS, 20-30 parts of aliphatic dibasic acid esters, 10-20 parts of EVA with a VA content of 40% and 10-20 parts of naphthenic oil, wherein SEBS and naphthenic oil play a cold-resistant role, the styrene content of SEBS commonly used on the market is generally 30%, and the butadiene content is 70%, and it is found in the present invention that the cold-resistant effect of SEBS with a styrene content of 20% and a butadiene content of 80% is the best, the aliphatic dibasic acid ester plays the role of a cold-resistant plasticizer, and the naphthenic oil is mainly composed of a saturated cyclic carbon chain combination, and this structure makes the intermolecular interaction force weaker, which helps to improve the activity of the polymer chain, thereby reducing the crystallinity and crystallinity of the polymer, so as to achieve a good cold-resistant effect. Therefore, a cold-resistant material of the present invention has good cold-resistant performance and can be applied to the production of soles.

[0013] Furthermore, the viscosity of the cyclohexane oil is 50 mm / s, and the obtained cold-resistant material has the best cold resistance. DETAILED DESCRIPTION

[0014] In order to further explain the technical solution of the present invention, the present invention is described in detail below through specific embodiments.

[0015] Example 1 A cold-resistant material comprises the following raw materials, measured by weight: 20 parts of EVA with a VA content of 28%, 20 parts of EVA with a VA content of 33%, 10 parts of a cold-resistant mixture, 20 parts of POE, 5 parts of EPDM rubber, 6 parts of an anti-wear agent, 0.3 parts of stearic acid, 0.5 parts of zinc stearate, 0.8 parts of zinc oxide, 0.35 parts of a bridging agent and 3.2 parts of a high-temperature foaming agent, wherein the cold-resistant mixture comprises 50 parts of SEBS, 20 parts of aliphatic dibasic acid esters, 20 parts of EVA with a VA content of 40% and 20 parts of cyclohexane oil, the content of styrene in SEBS is 20%, and the content of butadiene is 80%.

[0016] A method for preparing a cold-resistant material comprises the following steps: Step 1, according to the formula ratio, 50 parts of SEBS, 20 parts of aliphatic dibasic acid ester, 20 parts of EVA and 20 parts of naphthenic oil are put into an internal mixer and mixed at 120° C. for 8 minutes to obtain a mixture A; Step 2, then putting the mixed material A into a granulator for granulation to obtain a cold-resistant mixture; Step 3, then according to the formula ratio, 20 parts of EVA with a VA content of 28%, 20 parts of EVA with a VA content of 33%, 10 parts of cold-resistant mixture, 20 parts of POE, 5 parts of EPDM rubber, 6 parts of wear-resistant agent, 0.3 parts of stearic acid, 0.5 parts of zinc stearate, 0.8 parts of zinc oxide, 0.35 parts of bridging agent and 3.2 parts of high-temperature foaming agent are put into the internal mixer again, and mixed at 120°C for 2 min to obtain mixture B; Step 4: Finally, the mixed material B is put into a granulator for granulation to obtain the cold-resistant material.

[0017] Example 2 A cold-resistant material comprises the following raw materials, measured by weight: 25 parts of EVA with a VA content of 28%, 15 parts of EVA with a VA content of 18%, 15 parts of a cold-resistant mixture, 15 parts of POE, 6 parts of EPDM rubber, 8 parts of an anti-wear agent, 0.5 parts of stearic acid, 0.6 parts of zinc stearate, 1.0 parts of zinc oxide, 0.40 parts of a bridging agent and 3.0 parts of a high-temperature foaming agent, wherein the cold-resistant mixture comprises 60 parts of SEBS, 30 parts of aliphatic dibasic acid esters, 10 parts of EVA with a VA content of 40% and 10 parts of cyclohexane oil, the content of styrene in SEBS is 20%, and the content of butadiene is 80%.

[0018] A method for preparing a cold-resistant material comprises the following steps: Step 1: According to the formula ratio, 60 parts of SEBS, 30 parts of aliphatic dibasic acid ester, 10 parts of EVA and 10 parts of naphthenic oil are put into an internal mixer, and mixed at 125° C. for 10 min to obtain a mixture A; Step 2, then putting the mixed material A into a granulator for granulation to obtain a cold-resistant mixture; Step 3, then according to the formula ratio, 25 parts of EVA with a VA content of 28%, 15 parts of EVA with a VA content of 18%, 15 parts of cold-resistant mixture, 15 parts of POE, 6 parts of EPDM rubber, 8 parts of wear-resistant agent, 0.5 parts of stearic acid, 0.6 parts of zinc stearate, 1.0 parts of zinc oxide, 0.40 parts of bridging agent and 3.0 parts of high-temperature foaming agent were put into the internal mixer again, and mixed at 125°C for 3 min to obtain mixture B; Step 4: Finally, the mixed material B is put into a granulator for granulation to obtain the cold-resistant material.

[0019] In the above examples, all raw materials are purchased from the market, and the manufacturers and brands are shown in Table 1.

[0020] Table 1 Manufacturers and brands corresponding to raw materials

[0021] Application Example 1 The cold-resistant material prepared in Example 1 is subjected to compression foaming and molding to produce a shoe sole.

[0022] Application Example 2 The cold-resistant material prepared in Example 2 is subjected to compression foaming and molding to produce a shoe sole.

[0023] Application Example 3 First, 20 parts of EVA with a VA content of 28%, 20 parts of EVA with a VA content of 33%, 20 parts of POE, 5 parts of EPDM rubber, 6 parts of wear-resistant agent, 0.3 parts of stearic acid, 0.5 parts of zinc stearate, 0.8 parts of zinc oxide, 0.35 parts of bridging agent and 3.2 parts of high-temperature foaming agent are put into an internal mixer and mixed at 120°C for 8 min to obtain a mixture. Then the mixture is put into a granulator for granulation. After compression foaming and molding, the sole is made.

[0024] Application Example 4 First, 25 parts of EVA with a VA content of 28%, 15 parts of EVA with a VA content of 18%, 15 parts of POE, 6 parts of EPDM rubber, 8 parts of wear-resistant agent, 0.5 parts of stearic acid, 0.6 parts of zinc stearate, 1.0 parts of zinc oxide, 0.40 bridging agent and 3.0 parts of high-temperature foaming agent are put into the internal mixer again, and mixed at 125°C for 10 min to obtain a mixture, and then the mixture is put into a granulator for granulation, and after compression foaming and molding, the sole is made.

[0025] The soles of Application Examples 1 to 4 were subjected to physical property tests according to national testing standards, and the test data are shown in Table 2.

[0026] The data show that the hardness of the ordinary EVA soles obtained from Application Examples 3 to 4 increases by 18 to 20 degrees at -22°C, while the hardness of the soles obtained from Application Examples 1 to 2 increases less at -22°C, and their performance in flexibility and strength are better than that of ordinary soles.

[0027] Table 2 Performance data of the soles of various application examples

[0028] 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 cold-resistant material, characterized in that: The invention comprises the following raw materials by weight: 20-25 parts of EVA with a VA content of 28%, 15-20 parts of EVA with a VA content of 18% or 33%, 10-15 parts of a cold-resistant mixture, 15-20 parts of POE, 5-6 parts of EPDM rubber, 6-8 parts of an anti-wear agent, 0.3-0.5 parts of stearic acid, 0.5-0.6 parts of zinc stearate, 0.8-1.0 parts of zinc oxide, 0.35-0.40 parts of a bridging agent and 3.0-3.2 parts of a high-temperature foaming agent, wherein the cold-resistant mixture comprises 50-60 parts of SEBS, 20-30 parts of aliphatic dibasic acid esters, 10-20 parts of EVA with a VA content of 40% and 10-20 parts of cyclohexane oil, wherein the content of styrene in the SEBS is 20%, and the content of butadiene is 80%.

2. A cold-resistant material according to claim 1, characterized in that: The grade of the anti-wear agent is 108P.

3. A cold-resistant material according to claim 1, characterized in that: The bridging agent is 2,4-di-tert-butyl cumene peroxide.

4. A cold-resistant material according to claim 1, characterized in that: The grade of the high temperature foaming agent is AC6000.

5. The cold-resistant material according to claim 1, characterized in that: The viscosity of the naphthenic oil is 50 mm / s.

6. A method for preparing a cold-resistant material, characterized in that: The following steps are involved: Step 1: According to the formula ratio, 50-60 parts of SEBS, 20-30 parts of aliphatic dibasic acid ester, 10-20 parts of EVA and 10-20 parts of naphthenic oil are put into an internal mixer, and mixed at 120-125° C. for 8-10 min to obtain a mixture A; Step 2, then putting the mixed material A into a granulator for granulation to obtain a cold-resistant mixture; Step 3, then according to the formula ratio, 20-25 parts of EVA with a VA content of 28%, 15-20 parts of EVA with a VA content of 18% or 33%, 10-15 parts of cold-resistant mixture, 15-20 parts of POE, 5-6 parts of EPDM rubber, 6-8 parts of wear-resistant agent, 0.3-0.5 parts of stearic acid, 0.5-0.6 parts of zinc stearate, 0.8-1.0 parts of zinc oxide, 0.35-0.40 bridging agent and 3.0-3.2 parts of high-temperature foaming agent are put into the internal mixer again, and mixed at 120-125°C for 2-3 min to obtain mixture B; Step 4: Finally, the mixed material B is put into a granulator for granulation to obtain the cold-resistant material.

7. A cold-resistant material as claimed in claim 1 used in the manufacture of shoe soles, characterized in that: The sole is manufactured by subjecting the cold-resistant material to compression foaming and shaping.

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