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A kind of high gas barrier thermoplastic vulcanizate based on evoh and preparation method thereof

A thermoplastic vulcanizate and gas barrier technology, applied in the field of polymer materials, can solve the problems of poor fatigue durability, non-recyclable and reused products, etc., and achieve excellent physical and mechanical properties

Active Publication Date: 2020-05-19
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although there is a slight improvement in gas barrier performance, the fatigue durability is poor, and the product cannot be recycled and reused

Method used

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  • A kind of high gas barrier thermoplastic vulcanizate based on evoh and preparation method thereof
  • A kind of high gas barrier thermoplastic vulcanizate based on evoh and preparation method thereof
  • A kind of high gas barrier thermoplastic vulcanizate based on evoh and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The basic composition and mass parts of the selected raw materials are as follows:

[0026]

[0027]

[0028] According to the above formula, mix the dried EVOH and bromobutyl rubber at 200°C, add glycidyl methacrylate grafted ethylene-vinyl acetate copolymer (EVA-g-GMA) and antioxidant in proportion, After mixing evenly, discharge the material and cool to room temperature; then mix it with plasticizer and vulcanizing agent at room temperature to obtain a rubber-plastic premix; first, put 1 / 2 of the rubber-plastic premix in a twin-screw extruder, set The screw temperature was 160°C, the rotation speed was 300rpm, dynamic vulcanization was performed for 8 minutes, and then the remaining rubber and plastic premix was added and dynamic vulcanization was performed for 5 minutes to obtain a halogenated butyl rubber / ethylene-vinyl alcohol copolymer thermoplastic vulcanizate. The TPV was pressed into a 2mm thick sheet according to the standard and the performance was tes...

Embodiment 2

[0032] The basic composition and mass parts of the selected raw materials are as follows:

[0033]

[0034]

[0035] According to the above formula, mix the dried EVOH with brominated polyisobutylene-p-methylstyrene rubber at 180°C, and add maleic anhydride grafted ethylene-octene copolymer (POE-g-MAH) and Antioxidant, after being mixed evenly, the material is cooled to room temperature; then mixed with plasticizer and vulcanizing agent at room temperature to obtain a rubber-plastic premix; first, 1 / 3 of the rubber-plastic premix is ​​placed in twin-screw extrusion In the machine, set the screw temperature at 180°C, the rotation speed at 400rpm, dynamic vulcanization for 8 minutes, and then add the remaining rubber-plastic premix and dynamic vulcanization for 7 minutes. The TPV was pressed into a 2mm thick sheet according to the standard and the performance was tested. The performance is shown in Table 1.

Embodiment 3

[0039] The basic composition and mass parts of the selected raw materials are as follows:

[0040]

[0041]

[0042] According to the above formula, mix the dried EVOH and chlorobutyl rubber at 210°C, add glycidyl methacrylate grafted ethylene-vinyl acetate copolymer (EVA-g-GMA) and antioxidant in proportion, After mixing evenly, discharge the material and cool to room temperature; then mix it with plasticizer and vulcanizing agent at room temperature to obtain a rubber-plastic premix; first, put 1 / 4 of the rubber-plastic premix in a twin-screw extruder, set The screw temperature was 190°C, the rotation speed was 500rpm, dynamic vulcanization was performed for 4 minutes, and then the remaining rubber-plastic premix was added and dynamic vulcanization was performed for 8 minutes. The TPV was pressed into a 2mm thick sheet according to the standard and tested for performance. The performance is shown in Table 1.

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Abstract

The invention relates to an EVOH-based thermoplastic vulcanized rubber with high air barrier properties and a preparation method thereof. The EVOH-based thermoplastic vulcanized rubber with the high air barrier properties is mainly composed of raw materials including, halogenated butyl rubber, ethylene vinyl alcohol copolymer, bulking agent, antioxidant, plasticizer and vulcanizing agent, whereinthe bulking agent is a glycidyl methacrylate grafted ethylene vinyl acetate copolymer (EVA-g-GMA), maleic anhydride grafted ethylene-octene copolymer (POE-g-MAH) or medium-low-molecular-weight polyisobutene grafted maleic anhydride. The EVOH-based thermoplastic vulcanized rubber with the high air barrier properties has the advantages of a fine micro phase structure, excellent physical and mechanical properties, good air barrier properties, low hardness and the like, and can be applied to fields such as automobile tyre airtight layers, refrigerator hoses and gas barrier material linings.

Description

technical field [0001] The invention belongs to the field of polymer materials, and in particular relates to an EVOH-based high gas barrier thermoplastic vulcanizate and a preparation method thereof. Background technique [0002] Thermoplastic vulcanizate is a special thermoplastic elastomer obtained by dynamic vulcanization reaction processing technology. When a small amount of plastic phase is melt-blended with a large amount of rubber, the rubber is chemically cross-linked under the action of the cross-linking agent, and the viscosity increases, so it is broken into micron-sized rubber particles under the action of strong mechanical shear, and finally forms the following Rubber is the dispersed phase and plastic is the special phase structure of the continuous phase. This special structure makes thermoplastic vulcanizate not only have the high elasticity and softness of traditional rubber, but also have the properties of thermoplastic processing and recyclability of plas...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L23/28C08L29/04C08L51/06C08K13/02C08K5/134C08K5/053C08K3/22C08K5/3415C08K5/09C08J3/24
CPCC08J3/24C08J2323/28C08J2429/04C08K2003/2296C08L23/283C08L2201/14C08L2205/03C08L2205/08C08L29/04C08L51/06C08K13/02C08K5/1345C08K5/053C08K3/22C08K5/3415C08K5/09
Inventor 宁南英张文乾田明张立群李尚清
Owner BEIJING UNIV OF CHEM TECH
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