High-elasticity shock-absorbing light-sensing material and preparation method thereof

Abstract

This invention discloses a highly elastic, shock-absorbing, photosensitive material and its preparation method. By weight, it comprises the following components: 20-30 parts of a first ethylene vinyl acetate copolymer (EVA); 25-35 parts of a second ethylene vinyl acetate copolymer (EVA); 18-23 parts of a polyolefin elastomer (POE); 20-25 parts of a hydrogenated styrene-butadiene block copolymer (SEBS); 1-5 parts of ethylene propylene diene monomer (EPDM); 9-10 parts of an abrasion-resistant agent; 0.2-0.5 parts of an activator; 0.5-1 parts of an additive; 7-9 parts of high-gloss color particles; 0.5-1 parts of a crosslinking agent; and 5-8 parts of a low-temperature foaming agent. The first ethylene vinyl acetate copolymer contains 26% vinyl acetate (VA), and the second ethylene vinyl acetate copolymer contains 33% vinyl acetate (VA). The appearance of this highly elastic, shock-absorbing, photosensitive material can meet diverse and differentiated user needs.

Description

Technical Field

[0001] This invention relates to the field of shock-absorbing materials technology, specifically to a highly elastic shock-absorbing photosensitive material and its preparation method. Background Technology

[0002] Currently, in order to pursue lightweight design, the soles of athletic shoes generally use EVA foam material. However, this material has a relatively ordinary appearance and cannot meet the diverse and differentiated needs of users. Summary of the Invention

[0003] The purpose of this invention is to overcome the above-mentioned defects or problems in the prior art and to provide a highly elastic, shock-absorbing, light-sensitive material and its preparation method, the appearance of which can meet the diverse and differentiated user needs.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] A highly elastic, shock-absorbing, light-sensitive material, comprising the following components by weight:

[0006] First ethylene vinyl acetate copolymer (EVA) 20-30; Second ethylene vinyl acetate copolymer (EVA) 25-35; Polyolefin elastomer (POE) 18-23; Hydrogenated styrene-butadiene block copolymer (SEBS) 20-25; Ethylene propylene diene monomer (EPDM) rubber 1-5; Abrasion resistant agent 9-10; Activator 0.2-0.5; Additive 0.5-1; High-gloss color particles 7-9; Crosslinking agent 0.5-1; Low-temperature foaming agent 5-8; wherein, the vinyl acetate (VA) content in the first ethylene vinyl acetate copolymer is 26%, and the vinyl acetate (VA) content in the second ethylene vinyl acetate copolymer is 33%.

[0007] Furthermore, the hydrogenated styrene-butadiene block copolymer is a star-shaped SEBS with a molecular weight of 200,000 to 250,000.

[0008] Furthermore, the wear-resistant agent is an organosilicon wear-resistant agent.

[0009] Furthermore, the active agent is stearic acid.

[0010] Furthermore, the highlight particles are made of colored metallic pearlescent powder.

[0011] Furthermore, the crosslinking agent is dicumyl peroxide.

[0012] Furthermore, the low-temperature foaming agent is white azodicarbonamide.

[0013] Furthermore, the additive is zinc carbonate.

[0014] Furthermore, the present invention also provides a method for preparing a highly elastic, shock-absorbing, photosensitive material, which is based on the above-mentioned components of the highly elastic, shock-absorbing, photosensitive material and is prepared by the following steps: Step 1: Weigh the other components except for the additives and crosslinking agents according to the mass proportions and mix them; Step 2: Add the additives and crosslinking agents to the mixture obtained in Step 1 and mix it further; Step 3: Granulate the mixture obtained in Step 2 and perform initial foaming; Step 4: Mold the foamed product obtained in Step 3.

[0015] Further, in step one, the mixing temperature is 115±5℃ and the mixing time is 10-15min; in step two, the mixing temperature is 120±5℃ and the mixing time is 10-15min; in step three, supercritical physical foaming is used; in step four, the molding temperature is 175±5℃ for the upper mold and 175±5℃ for the lower mold, and the molding time is 450±30s.

[0016] As can be seen from the above description of the present invention, compared with the prior art, the present invention has the following beneficial effects:

[0017] Adding high-gloss pigment particles makes the final material bright in color and glossy, with a good high-gloss texture, which can meet the diverse and differentiated needs of users.

[0018] The high-elasticity, wear-resistant material of this invention needs to exhibit good high-gloss texture while simultaneously possessing good resilience and shock absorption properties. Since the high-gloss pigment particles used have a significant impact on the final resilience and shock absorption properties of the material when dispersed in the system, the amount of high-gloss pigment particles cannot be excessive. Therefore, achieving both good high-gloss texture and good resilience and shock absorption properties becomes a key technical challenge in the preparation of this material.

[0019] In this invention, two ethylene-vinyl acetate copolymers with different VA contents are used in the composition. EVA with a VA content of 26% provides basic hardness and abrasion resistance, resulting in better shock absorption in the final material. EVA with a VA content of 33% provides better softness and elasticity, resulting in better resilience. In addition, a polyolefin elastomer is added to improve the impact strength and processing performance. Hydrogenated styrene-butadiene block copolymer, preferably star-shaped SEBS with a molecular weight of 200,000 to 250,000, is also added. The addition of a certain amount of star-shaped SEBS, with its low flowability, allows the high-gloss particles to disperse slowly in the system and reduces their flowability. This ensures that even with a small amount of high-gloss particles, the final material exhibits a good high-gloss color. Furthermore, SEBS itself has good mechanical properties and can work with EVA and POE to improve the resilience of the final material, while also improving the surface finish of the product, further enhancing the high-gloss texture brought by the high-gloss particles.

[0020] Using a low-temperature foaming agent can reduce the influence of the foaming agent's color on the final material, allowing the color of the high-gloss particles to stand out on the material surface. At the same time, foaming at low temperature can reduce the agglomeration of high-gloss particles in the system, resulting in better dispersion of high-gloss particles and the formation of a more uniform high-gloss texture. Detailed Implementation

[0021] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are preferred embodiments of the present invention and should not be considered as excluding other embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0022] In the claims and description of this invention, the terms "comprising," "having," and variations thereof are used to mean "including but not limited to."

[0023] This invention provides a highly elastic, shock-absorbing, photosensitive material and its preparation method. The material comprises the following components by weight: 20-30 parts of a first ethylene vinyl acetate copolymer (EVA); 25-35 parts of a second ethylene vinyl acetate copolymer (EVA); 18-23 parts of a polyolefin elastomer (POE); 20-25 parts of a hydrogenated styrene-butadiene block copolymer (SEBS); 1-5 parts of ethylene propylene diene monomer (EPDM); 9-10 parts of abrasion-resistant agent; 0.2-0.5 parts of an activator; 0.5-1 parts of an additive; 7-9 parts of high-gloss color particles; 0.5-1 parts of a crosslinking agent; and 5-8 parts of a low-temperature foaming agent. The first ethylene vinyl acetate copolymer contains 26% vinyl acetate (VA), and the second ethylene vinyl acetate copolymer contains 33% vinyl acetate (VA).

[0024] Furthermore, the hydrogenated styrene-butadiene block copolymer uses star-shaped SEBS with a molecular weight of 200,000 to 250,000, designated as Baling Petrochemical 602T. The wear-resistant agent is an organosilicon wear-resistant agent, specifically a silicone coupling agent. The activator is stearic acid. The additive is zinc carbonate. The high-gloss color particles use colored metallic pearlescent powder, which can be a mixture of mica powder and titanium dioxide. The crosslinking agent is dicumyl peroxide. The low-temperature foaming agent is white azodicarbonamide.

[0025] The aforementioned highly elastic, shock-absorbing, and photosensitive material is prepared based on the above components using the following steps:

[0026] Step 1: Weigh out all components except the additives and crosslinking agents according to the mass proportions and mix them; Step 2: Add the additives and crosslinking agents to the mixture obtained in Step 1 and mix it further; Step 3: Granulate the mixture obtained in Step 2 and perform initial foaming; Step 4: Mold the foamed product obtained in Step 3.

[0027] In step one, the mixing temperature is 115±5℃ and the mixing time is 10-15 min; in step two, the mixing temperature is 120±5℃ and the mixing time is 10-15 min; in step three, supercritical physical foaming is used; in step four, the molding temperature is 175±5℃ for both the upper and lower mold layers, and the molding time is 450±30 s. The process parameters for supercritical physical foaming in step three are as follows: the fluid environment is a mixture of nitrogen and carbon dioxide, with a nitrogen to carbon dioxide volume ratio of 75% to 25%; the pressure during the pressurization stage is 15 MPa, and the holding time is 100 min; the pressure during the depressurization stage is 0.8 MPa, and the holding time is 5 min; after this, cooling is performed to obtain the foamed preform.

[0028] The high-elasticity, shock-absorbing, light-sensitive material provided by this invention incorporates high-gloss color particles, resulting in a material with bright color, excellent gloss, and a superior high-gloss texture, thus meeting the diverse and differentiated needs of users.

[0029] The high-elasticity, wear-resistant material of this invention needs to exhibit good high-gloss texture while simultaneously possessing good resilience and shock absorption properties. Since the high-gloss pigment particles used have a significant impact on the final resilience and shock absorption properties of the material when dispersed in the system, the amount of high-gloss pigment particles cannot be excessive. Therefore, achieving both good high-gloss texture and good resilience and shock absorption properties becomes a key technical challenge in the preparation of this material.

[0030] In this invention, two ethylene-vinyl acetate copolymers with different VA contents are used in the composition. EVA with a VA content of 26% provides basic hardness and abrasion resistance, resulting in better shock absorption in the final material. EVA with a VA content of 33% provides better softness and elasticity, resulting in better resilience. In addition, a polyolefin elastomer is added to improve the impact strength and processing performance. Hydrogenated styrene-butadiene block copolymer, preferably star-shaped SEBS with a molecular weight of 200,000 to 250,000, is also added. The addition of a certain amount of star-shaped SEBS, with its low flowability, allows the high-gloss particles to disperse slowly in the system and reduces their flowability. This ensures that even with a small amount of high-gloss particles, the final material exhibits a good high-gloss color. Furthermore, SEBS itself has good mechanical properties and can work with EVA and POE to improve the resilience of the final material, while also improving the surface finish of the product, further enhancing the high-gloss texture brought by the high-gloss particles.

[0031] Using a low-temperature foaming agent can reduce the influence of the foaming agent's color on the final material, allowing the color of the high-gloss particles to stand out on the material surface. At the same time, foaming at low temperature can reduce the agglomeration of high-gloss particles in the system, resulting in better dispersion of high-gloss particles and the formation of a more uniform high-gloss texture.

[0032] Example 1

[0033] Weigh the components according to the following parts by mass:

[0034]

[0035] The first ethylene-vinyl acetate copolymer contains 26% vinyl acetate (VA), and the second ethylene-vinyl acetate copolymer contains 33% vinyl acetate (VA). The hydrogenated styrene-butadiene block copolymer uses star-shaped SEBS with a molecular weight of 200,000 to 250,000, designated Baling Petrochemical 602T. The wear-resistant agent is an organosilicon wear-resistant agent, specifically a silicone coupling agent. The activator is stearic acid. The additive is zinc carbonate. The high-gloss color particles are colored metallic pearlescent powder, which can be a mixture of mica powder and titanium dioxide. The crosslinking agent is dicumyl peroxide. The low-temperature foaming agent is white azodicarbonamide.

[0036] Using the above components as raw materials, a highly elastic, shock-absorbing, and photosensitive material is prepared according to the following steps:

[0037] Step 1: Weigh out all components except the additives and crosslinking agents according to the mass proportions and mix them; Step 2: Add the additives and crosslinking agents to the mixture obtained in Step 1 and mix it further; Step 3: Granulate the mixture obtained in Step 2 and perform initial foaming; Step 4: Mold the foamed product obtained in Step 3.

[0038] Using the above components as raw materials, a highly elastic, shock-absorbing, and photosensitive material is prepared according to the following steps:

[0039] Step 1: Weigh out all components except the additives and crosslinking agents according to the mass proportions and mix them; Step 2: Add the additives and crosslinking agents to the mixture obtained in Step 1 and mix it further; Step 3: Granulate the mixture obtained in Step 2 and perform initial foaming; Step 4: Mold the foamed product obtained in Step 3.

[0040] In step one, the mixing temperature is 115℃ and the mixing time is 15 min; in step two, the mixing temperature is 120℃ and the mixing time is 15 min; in step three, supercritical physical foaming is used; in step four, the molding temperature is 175℃ for both the upper and lower molds, and the molding time is 450 s. The process parameters for supercritical physical foaming in step three are as follows: the fluid environment is a mixture of nitrogen and carbon dioxide, with a nitrogen to carbon dioxide volume ratio of 75% to 25%; the pressure during the pressurization stage is 15 MPa, and the holding time is 100 min; the pressure during the depressurization stage is 0.8 MPa, and the holding time is 5 min; then, cooling is performed to obtain the foamed preform.

[0041] Example 2

[0042] Weigh the components according to the following parts by mass:

[0043]

[0044] The first ethylene-vinyl acetate copolymer contains 26% vinyl acetate (VA), and the second ethylene-vinyl acetate copolymer contains 33% vinyl acetate (VA). The hydrogenated styrene-butadiene block copolymer uses star-shaped SEBS with a molecular weight of 200,000 to 250,000, designated Baling Petrochemical 602T. The wear-resistant agent is an organosilicon wear-resistant agent, specifically a silicone coupling agent. The activator is stearic acid. The additive is zinc carbonate. The high-gloss color particles are colored metallic pearlescent powder, which can be a mixture of mica powder and titanium dioxide. The crosslinking agent is dicumyl peroxide. The low-temperature foaming agent is white azodicarbonamide.

[0045] Using the above components as raw materials, a highly elastic, shock-absorbing, and photosensitive material is prepared according to the following steps:

[0046] Step 1: Weigh out all components except the additives and crosslinking agents according to the mass proportions and mix them; Step 2: Add the additives and crosslinking agents to the mixture obtained in Step 1 and mix it further; Step 3: Granulate the mixture obtained in Step 2 and perform initial foaming; Step 4: Mold the foamed product obtained in Step 3.

[0047] Using the above components as raw materials, a highly elastic, shock-absorbing, and photosensitive material is prepared according to the following steps:

[0048] Step 1: Weigh out all components except the additives and crosslinking agents according to the mass proportions and mix them; Step 2: Add the additives and crosslinking agents to the mixture obtained in Step 1 and mix it further; Step 3: Granulate the mixture obtained in Step 2 and perform initial foaming; Step 4: Mold the foamed product obtained in Step 3.

[0049] In step one, the mixing temperature is 115℃ and the mixing time is 15 min; in step two, the mixing temperature is 120℃ and the mixing time is 15 min; in step three, supercritical physical foaming is used; in step four, the molding temperature is 175℃ for both the upper and lower molds, and the molding time is 450 s. The process parameters for supercritical physical foaming in step three are as follows: the fluid environment is a mixture of nitrogen and carbon dioxide, with a nitrogen to carbon dioxide volume ratio of 75% to 25%; the pressure during the pressurization stage is 15 MPa, and the holding time is 100 min; the pressure during the depressurization stage is 0.8 MPa, and the holding time is 5 min; then, cooling is performed to obtain the foamed preform.

[0050] Example 3

[0051] Weigh the components according to the following parts by mass:

[0052]

[0053] The first ethylene-vinyl acetate copolymer contains 26% vinyl acetate (VA), and the second ethylene-vinyl acetate copolymer contains 33% vinyl acetate (VA). The hydrogenated styrene-butadiene block copolymer uses star-shaped SEBS with a molecular weight of 200,000 to 250,000, designated Baling Petrochemical 602T. The wear-resistant agent is an organosilicon wear-resistant agent, specifically a silicone coupling agent. The activator is stearic acid. The additive is zinc carbonate. The high-gloss color particles are colored metallic pearlescent powder, which can be a mixture of mica powder and titanium dioxide. The crosslinking agent is dicumyl peroxide. The low-temperature foaming agent is white azodicarbonamide.

[0054] Using the above components as raw materials, a highly elastic, shock-absorbing, and photosensitive material is prepared according to the following steps:

[0055] Step 1: Weigh out all components except the additives and crosslinking agents according to the mass proportions and mix them; Step 2: Add the additives and crosslinking agents to the mixture obtained in Step 1 and mix it further; Step 3: Granulate the mixture obtained in Step 2 and perform initial foaming; Step 4: Mold the foamed product obtained in Step 3.

[0056] Using the above components as raw materials, a highly elastic, shock-absorbing, and photosensitive material is prepared according to the following steps:

[0057] Step 1: Weigh out all components except the additives and crosslinking agents according to the mass proportions and mix them; Step 2: Add the additives and crosslinking agents to the mixture obtained in Step 1 and mix it further; Step 3: Granulate the mixture obtained in Step 2 and perform initial foaming; Step 4: Mold the foamed product obtained in Step 3.

[0058] In step one, the mixing temperature is 115℃ and the mixing time is 15 min; in step two, the mixing temperature is 120℃ and the mixing time is 15 min; in step three, supercritical physical foaming is used; in step four, the molding temperature is 175℃ for both the upper and lower molds, and the molding time is 450 s. The process parameters for supercritical physical foaming in step three are as follows: the fluid environment is a mixture of nitrogen and carbon dioxide, with a nitrogen to carbon dioxide volume ratio of 75% to 25%; the pressure during the pressurization stage is 15 MPa, and the holding time is 100 min; the pressure during the depressurization stage is 0.8 MPa, and the holding time is 5 min; then, cooling is performed to obtain the foamed preform.

[0059] Comparative Example 1

[0060] Based on Example 3, the same preparation steps and the same components were used, and the following component list was followed:

[0061]

[0062]

[0063] Comparative Example 2

[0064] Based on Example 3, the same preparation steps were used, and the following component list was followed:

[0065]

[0066] The additives include 0.8 parts by weight of zinc carbonate and 2 parts by weight of talc. The foaming agent includes 2 parts by weight of conventional high-temperature foaming agent and 3.3 parts by weight of low-temperature foaming agent.

[0067] Performance tests were conducted on Examples 1-3 and Comparative Examples 1 and 2 as described above, and the test results are as follows:

[0068]

[0069]

[0070] The test results above show that the high-elasticity, shock-absorbing, and light-sensitive materials provided in Examples 1-3 of this invention achieve a good balance in terms of rebound performance, shock absorption performance, and appearance. While Comparative Example 1 has high heel shock absorption performance, its high-gloss texture is insufficient. Comparative Example 2 has poor forefoot rebound performance, and its appearance also fails to meet requirements.

[0071] The foregoing description of the specifications and embodiments is intended to explain the scope of protection of this invention, but does not constitute a limitation on the scope of protection of this invention. Modifications, equivalent substitutions, or other improvements to the embodiments of this invention or a portion thereof that can be obtained by those skilled in the art through logical analysis, reasoning, or limited experimentation, based on the teachings of this invention or the foregoing embodiments, in conjunction with common knowledge, general technical knowledge, and / or existing technology, should all be included within the scope of protection of this invention.

Claims

1. A highly elastic, shock-absorbing, light-sensitive material, characterized in that, According to parts by mass, it includes the following components: 20-30 parts of the first ethylene vinyl acetate copolymer; 25-35 parts of ethylene-vinyl acetate copolymer; 18-23 parts of polyolefin elastomer; 20-25 parts of hydrogenated styrene-butadiene block copolymer; 1-5 parts of ethylene propylene diene monomer (EPDM) rubber; 9-10 parts of abrasion resistant agent; 0.2-0.5 parts of activator; 0.5-1 part of additives; 7-9 parts of high-gloss color particles; 0.5-1 part of crosslinking agent; 5-8 parts of low-temperature foaming agent; The vinyl acetate content in the first ethylene vinyl acetate copolymer is 26%, and the vinyl acetate content in the second ethylene vinyl acetate copolymer is 33%. The high-gloss color particles are made of colored metallic pearlescent powder; The additive used is zinc carbonate.

2. The highly elastic, shock-absorbing, photosensitive material as described in claim 1, characterized in that, The hydrogenated styrene-butadiene block copolymer uses star-shaped SEBS with a molecular weight of 200,000 to 250,000.

3. The highly elastic, shock-absorbing, photosensitive material as described in claim 1, characterized in that, The wear-resistant agent is an organosilicon wear-resistant agent.

4. The highly elastic, shock-absorbing, photosensitive material as described in claim 1, characterized in that, The active agent is stearic acid.

5. The highly elastic, shock-absorbing, photosensitive material as described in claim 1, characterized in that, The crosslinking agent is dicumyl peroxide.

6. The highly elastic, shock-absorbing, photosensitive material as described in claim 1, characterized in that, The low-temperature foaming agent is white azodicarbonamide.

7. A method for preparing a highly elastic, shock-absorbing, photosensitive material, characterized in that, Based on the composition of the highly elastic shock-absorbing photosensitive material according to any one of claims 1-6, it is prepared using the following steps: Step 1: Weigh out all components except for additives and crosslinking agents according to their mass proportions, and then mix them together; Step 2: Add the additives and crosslinking agents to the compound obtained in Step 1 for further mixing; Step 3: Granulate the compound product obtained in Step 2 and perform initial foaming; Step 4: Mold the foamed product obtained in Step 3.

8. The method for preparing a highly elastic, shock-absorbing, photosensitive material as described in claim 7, characterized in that, In step one, the mixing temperature is 115±5℃ and the mixing time is 10-15min; in step two, the mixing temperature is 120±5℃ and the mixing time is 10-15min; in step three, supercritical physical foaming is used; in step four, the molding temperature is 175±5℃ for both the upper and lower molds, and the molding time is 450±30s.

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