A high-elastic, shock-absorbing, anti-static rubber-plastic blended foaming material, and a preparation method and application thereof

Abstract

This invention discloses a high-elasticity, shock-absorbing, and antistatic rubber-plastic blend foam material. The rubber-plastic blend foam material is made from the following raw materials in the specified proportions: EVA 60-70g; POE 10-15g; SEBS 10-20g; EPDM rubber 10-20g; nitrile rubber 5-10g; nano zinc oxide 2-5g; zinc stearate 3-5g; crosslinking agent 5-10g; foaming agent 2-5g; carbon nanotubes 1-5g; polyborosiloxane 2-10g. This high-elasticity, shock-absorbing, and antistatic rubber-plastic blend foam material can be used to manufacture individual protective equipment. By adding polyborosiloxane and carbon nanotubes, this invention improves the shock-absorbing and antistatic properties of the EVA rubber-plastic blend foam material. Furthermore, other mechanical properties remain within the normal operating range. The high-elasticity, shock-absorbing, and antistatic foamed rubber-plastic material prepared by this invention meets the performance requirements of related products.

Description

Technical Field

[0001] This invention relates to a highly elastic, shock-absorbing, and antistatic rubber-plastic blended foam material, its preparation method, and its application, belonging to the field of polymer materials technology. Background Technology

[0002] EVA (ethylene-vinyl acetate copolymer) is a widely used thermoplastic produced by the copolymerization of ethylene and vinyl acetate (VA). The introduction of vinyl acetate monomers into the polyethylene molecular chain gives it greater flexibility, resulting in advantages such as lightweight, softness, wear resistance, heat insulation, excellent resilience, and low compression set. However, while traditional EVA foam materials can achieve good elasticity through formulation adjustments, they are still not ideal in terms of shock absorption and antistatic properties. Furthermore, the viscoelasticity of the material decreases at low temperatures, limiting its application scenarios and making it difficult to meet the requirements of specialized industries. Summary of the Invention

[0003] The purpose of this invention is to provide a rubber-plastic blended foam material with high elasticity, shock absorption, and antistatic properties.

[0004] The high-elasticity, shock-absorbing, and antistatic rubber-plastic blended foam material provided by this invention is made from raw materials in the following proportions:

[0005] EVA 60-70g; POE 10-15g; SEBS 10-20g; EPDM rubber 10-20g; Nitrile rubber 5-10g; Nano zinc oxide 2-5g; Zinc stearate 3-5g; Crosslinking agent 5-10g; Foaming agent 2-5g; Carbon nanotubes 1-5g; Polyborosiloxane 2-10g.

[0006] Preferably, the carbon nanotube has a diameter of 4-8 nm and a length of 10-20 μm.

[0007] Preferably, the molar ratio of silicon atoms to boron atoms in the polyborosiloxane is 1:2 or 5:6.

[0008] Preferably, the crosslinking agent is BIBP, which stands for bis-tert-butylperoxide diisopropylbenzene.

[0009] Preferably, the foaming agent is AC, which stands for azodicarbonamide.

[0010] In this invention, EVA represents ethylene-vinyl acetate copolymer, wherein the VA content is approximately 21%.

[0011] In this invention, POE represents polyethylene octene co-elastomer.

[0012] In this invention, SEBS represents a linear triblock copolymer with polystyrene as the end segment and ethylene-butene copolymer obtained by hydrogenating polybutadiene as the middle elastic block.

[0013] Preferably, the raw material ratio of the rubber-plastic blended foam material is any one of the following 1)-3):

[0014] 1) EVA 70g, POE 10g, SEBS 20g, EPDM rubber 10g, nitrile rubber 10g, nano zinc oxide 5g, zinc stearate 5g, crosslinking agent 10g, foaming agent 3g, carbon nanotubes 1g, polyborosiloxane 2g.

[0015] 2) EVA 60g, POE 20g, SEBS 10g, EPDM rubber 15g, nitrile rubber 10g, nano zinc oxide 5g, zinc stearate 5g, crosslinking agent 10g, foaming agent 3g, carbon nanotubes 2.5g, polyborosiloxane 3g.

[0016] 3) EVA 60g, POE 20g, SEBS 10g, EPDM rubber 15g, nitrile rubber 10g, nano zinc oxide 5g, zinc stearate 5g, crosslinking agent 10g, foaming agent 3g, carbon nanotubes 5g, polyborosiloxane 4g.

[0017] The present invention also provides a method for preparing the rubber-plastic blended foam material, comprising the following steps:

[0018] 1) Place the raw materials into an internal mixer for internal mixing to achieve uniform dispersion and blending;

[0019] 2) Place the uniformly mixed material obtained in step 2) into a mold and perform in-mold foaming to obtain the high-elasticity, shock-absorbing, and antistatic rubber-plastic foam material.

[0020] In the preparation method of the present invention, in step 1), the mixing temperature is 110-120℃;

[0021] In step 2), the temperature of the in-mold foaming is 180-200℃.

[0022] The high-elasticity, shock-absorbing, and antistatic rubber-plastic blended foam material of this invention can be used to manufacture individual soldier protective equipment.

[0023] This invention improves the shock absorption and antistatic properties of EVA rubber-plastic foamed blends by incorporating polyborosiloxane and carbon nanotubes, while maintaining other mechanical properties within normal usage requirements. The highly elastic, shock-absorbing, and antistatic foamed rubber-plastic material prepared by this invention meets the performance requirements of related products. Detailed Implementation

[0024] Unless otherwise specified, the experimental methods used in the following examples are conventional methods.

[0025] Unless otherwise specified, all materials and reagents used in the following examples are commercially available.

[0026] The carbon nanotubes used in the following examples have a diameter of 4-8 nm and a length of 10-20 μm.

[0027] In the following examples, EVA was purchased from Taiwan Plastics Corporation, with a VA content of approximately 21%; POE was purchased from Dow Chemical Company, USA; SEBS was purchased from Zhejiang Zhongli Synthetic Materials Technology Co., Ltd.; EPDM rubber was purchased from Changzhou Guanxin Co., Ltd.; nitrile rubber was purchased from Lanzhou Petrochemical Co., Ltd.; nano zinc oxide was purchased from Taixiang Rubber (Shenzhen) Co., Ltd.; zinc stearate was purchased from Hangzhou Zanyu Chemical Co., Ltd.; carbon nanotubes were purchased from Chengdu Zhongke Times Nanotechnology Co., Ltd.; and polyborosiloxane (with a silicon to boron molar ratio of 5:6) was purchased from Shaanxi Peak Xuankai New Materials Co., Ltd.

[0028] In the following examples, the crosslinking agent was BIBP, purchased from Liuyang Fangruida Chemical Co., Ltd.; the foaming agent was AC, purchased from Xiamen Xinyu New Materials Co., Ltd.

[0029] The proportions of each raw material in each embodiment and comparative example are shown in Table 1, and the preparation methods are as follows:

[0030] Table 1. Formulations of rubber and plastic foam materials in comparative examples and Examples 1-3

[0031] raw material Comparative Example 1 Example 1 Example 2 Example 3 EVA 70 70 60 60 POE 10 10 20 20 SEBS 20 20 10 15 EPDM rubber 10 10 15 15 Nitrile rubber 5 10 10 10 Nano zinc oxide 5 5 5 5 Zinc stearate 5 5 5 5 Crosslinking agent 10 10 10 10 foaming agent 3 3 3 3 carbon nanotubes 0 1 2.5 5 Polyborosiloxane 0 2 3 4

[0032] First, all raw materials except carbon nanotubes are placed in a mixer at 110-120℃ for internal mixing to ensure that the components are evenly dispersed and blended. Then, the material with added carbon nanotubes and uniformly mixed is placed into a finished product mold and heated to 180℃ for in-mold foaming to obtain the high-elasticity, shock-absorbing, and antistatic rubber-plastic foam material.

[0033] The properties of the rubber and plastic foam materials in the above embodiments and comparative examples are shown in Table 2. The tensile strength test method is GB / T528, the rebound test method is GB / T 10652, the impact force test method is GB / T30907, the electrical resistance test method is GB / T 11210, and the hardness test method is HG / T 2489.

[0034] Table 2. Performance of the rubber and plastic foam materials in comparative examples and Examples 1-3

[0035] Test Project Comparative Example 1 Example 1 Example 2 Example 3 <![CDATA[Density, g / cm 3 > 0.25 0.27 0.24 0.26 Tensile strength, MPa 5.35 5.18 4.96 5.02 Rebound, % 37 53 55 54 Impact force value, kN 2360 1753 1645 1690 Resistance, Ω ∞ <![CDATA[1.8×10 7 ]]> <![CDATA[7.8×10 6 ]]> <![CDATA[8.7×10 6 ]]> Hardness, Shore C 66 65 66 67

[0036] As can be seen from the data in Table 2, Comparative Example 1 is a blank control sample. After adjusting the formula and adding polyborosiloxane and carbon nanotubes, the elasticity, buffering performance and antistatic function of the rubber material are improved. Considering the cost and processing technology, Example 1 or Example 2 is preferred in actual production. This can prepare a rubber-plastic blended foam material with high elasticity, shock absorption (peak impact force) and antistatic properties, which can meet the performance requirements of related products.

Claims

1. A highly elastic, shock-absorbing, and antistatic rubber-plastic blended foam material, made from raw materials in the following proportions: EVA 60-70g; POE 10-15g; SEBS 10-20g; EPDM rubber 10-20g; Nitrile rubber 5-10g; Nano zinc oxide 2-5g; Zinc stearate 3-5g; Crosslinking agent 5-10g; Foaming agent 2-5g; Carbon nanotubes 1-5g; Polyborosiloxane 2-10g.

2. The elastomer-plastic blend foamed material according to claim 1, characterized in that: The carbon nanotubes have a diameter of 4-8 nm and a length of 10-20 μm.

3. The elastomer-plastic blend foamed material according to claim 1 or 2, characterized in that: The molar ratio of silicon atoms to boron atoms in the polyborosiloxane is 1:2 or 5:

6.

4. The elastomer-plastic blend foamed material according to any one of claims 1 to 3, characterized in that: The bridging agent is BIBP.

5. The elastomer-plastic blend foamed material according to any one of claims 1 to 4, characterized in that: The foaming agent is AC foaming agent.

6. The elastomer-plastic blend foamed material according to any one of claims 1 to 5, characterized in that: The raw material ratio of the rubber-plastic blended foam material is any one of the following 1)-3): 1) EVA 70g, POE 10g, SEBS 20g, EPDM rubber 10g, nitrile rubber 10g, nano zinc oxide 5g, zinc stearate 5g, crosslinking agent 10g, foaming agent 3g, carbon nanotubes 1g, polyborosiloxane 2g. 2) EVA 60g, POE 20g, SEBS 10g, EPDM rubber 15g, nitrile rubber 10g, nano zinc oxide 5g, zinc stearate 5g, crosslinking agent 10g, foaming agent 3g, carbon nanotubes 2.5g, polyborosiloxane 3g. 3) EVA 60g, POE 20g, SEBS 10g, EPDM rubber 15g, nitrile rubber 10g, nano zinc oxide 5g, zinc stearate 5g, crosslinking agent 10g, foaming agent 3g, carbon nanotubes 5g, polyborosiloxane 4g.

7. A method for preparing the rubber-plastic blended foam material according to any one of claims 1-6, comprising the following steps: 1) Place the raw materials into an internal mixer for internal mixing to achieve uniform dispersion and blending; 2) Place the uniformly mixed material obtained in step 1) into a mold and perform in-mold foaming to obtain the high-elasticity, shock-absorbing, and antistatic rubber-plastic foam material.

8. The method of claim 7, wherein: In step 1), the mixing temperature is 110-120℃; In step 2), the temperature of the in-mold foaming is 180-200℃.

9. The application of the high-elasticity, shock-absorbing, and antistatic rubber-plastic blended foam material according to any one of claims 1-6 in the preparation of individual protective equipment.