EVA/EVM blending type thermoplastic vulcanizate and preparation method therefor

A thermoplastic vulcanizate and blending technology, which is used in the preparation and performance research of thermoplastic vulcanizates, in the field of thermoplastic vulcanizate preparation, can solve the problems of low hardness, UV aging resistance, poor UV aging resistance, etc. The effect of anti-UV aging

Inactive Publication Date: 2015-09-23
QINGDAO UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention aims at the disadvantages of poor UV aging resistance of PP / EDPM blended thermoplastic vulcanizates and the high hardness of PP / EPDM thermoplastic vulcanizates not filled with softeners, and prepares an EVA / EVM blended thermoplastic vulcanizate. Vulcanizate, further develop the product grade of thermoplastic vulcanizate material, the product has lower hardness and better UV aging resistance

Method used

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  • EVA/EVM blending type thermoplastic vulcanizate and preparation method therefor
  • EVA/EVM blending type thermoplastic vulcanizate and preparation method therefor
  • EVA/EVM blending type thermoplastic vulcanizate and preparation method therefor

Examples

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Effect test

Embodiment 1

[0018] Example 1: Preparation of EVA / EVM blended thermoplastic vulcanizate

[0019] (1) 50.0 grams of EVM (vinyl acetate mass content is 50%) rubber particles are added into an open mill at 30° C. with a roller spacing of 1.0 mm, then 1.0 grams of DCP and 1.5 grams of TAIC are added, and mixed for 3 minutes to obtain EVM rubber compound;

[0020] (2) 50 grams of EVA (vinyl acetate mass content is 15%) resin is melted and plasticized on a two-roll mill at 165°C; EVM compound rubber is added to the mill afterwards, and is mixed with the EVA melt of melting at temperature Dynamic vulcanization under the action of field and shear force field for 8 minutes;

[0021] (3) After the dynamic vulcanization is over, quickly remove the sheet from the mill and cool it down, then put the sample into a stainless steel mold with a polytetrafluoroethylene isolation film, preheat it at 165°C for 5 minutes with a flat vulcanizer, and then Molded under a pressure of 10MPa for 8 minutes, and the...

Embodiment 2

[0024] Example 2: Preparation of EVA / EVM blended thermoplastic vulcanizate

[0025]EVM (mass content of vinyl acetate is 50%), DCP, TAIC and EVA (mass content of vinyl acetate is 20%) are 60 grams, 1.2 grams, 1.8 grams and 40 grams respectively. The rest is the same as implementation 1.

Embodiment 3

[0026] Example 3: Preparation of EVA / EVM blended thermoplastic vulcanizate

[0027] EVM (vinyl acetate mass content is 60%), DCP, TAIC and EVA (vinyl acetate mass content is 15%) are 70 grams, 1.4 grams, 2.1 grams and 30 grams respectively. The rest is the same as implementation 1.

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Abstract

The invention provides an EVA/EVM blending type thermoplastic vulcanizate and a preparation method therefor. The thermoplastic vulcanizate comprises EVA, EVM, a peroxide vulcanizing agent DCP and a crosslinking coagent TAI, wherein the mass ratio of the EVA to the EVM is 1:1-4, and the dosage of the peroxide vulcanizing agent DCP and the dosage of the crosslinking coagent TAI are respectively 2% and 3% of the mass of the EVM. The method comprises the following steps of: uniformly mixing the EVM with the peroxide vulcanizing agent as well as the crosslinking coagent through mixing so as to obtain a rubber compound; (2) fusing and plasticizing the EVA in a high-temperature mixing instrument so as to obtain an EVA fusant, adding the EVM rubber compound in the EVA fusant, and enabling the EVM rubber compound and the EVA fusant to perform dynamic vulcanization under the effects of a temperature field and a shearing force field; and (3) after finishing dynamic vulcanization, taking out products of dynamic vulcanization, and performing thermoplastic formation according to needs. The thermoplastic vulcanizate disclosed by the invention has good physical and mechanical properties, low hardness and good UV aging resistance.

Description

technical field [0001] The present invention relates to a kind of thermoplastic vulcanizate based on EVA and EVM blending system and its preparation method, in particular, relates to a kind of dynamic vulcanization EVA / EVM blending system to obtain better physical and mechanical properties, lower The invention discloses a preparation method of thermoplastic vulcanizate with hardness and UV aging resistance, which belongs to the preparation and performance research of thermoplastic vulcanizate. Background technique [0002] Thermoplastic vulcanizate is a kind of thermoplastic elastomer family, which is prepared by dynamic vulcanization method. Dynamic vulcanization refers to the effect of temperature field and shear force field during the melt blending process of rubber compound and thermoplastic resin. Under this condition, the "in situ" vulcanization of rubber is realized and the rubber phase is shredded into tiny vulcanized rubber particles dispersed in the thermoplastic r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L31/04C08L23/08C08K5/14C08K5/3492B29C35/02
Inventor 王兆波王灿灿赵静宣宗伟杜芳林
Owner QINGDAO UNIV OF SCI & TECH
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