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Carboxyl-functionalized rubber cross-linked elastomer capable of being repeatedly processed and preparation method thereof

A carboxyl-functionalized and cross-linked elastomer technology, applied in the field of rubber vulcanization, can solve the problems of blooming, storage prone to explosion, carcinogen nitrosamines, etc.

Active Publication Date: 2020-11-17
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, the vulcanization fume will be accompanied by a foul smell, and even after vulcanization, the rubber products will still emit an unpleasant smell
(2) Many commonly used accelerators are themselves toxic or produce toxic substances
For example, Accelerator CZ produces sensitization to human skin; Accelerator D is toxic; Accelerator DZ produces carcinogen nitrosamines
(3) Vulcanizing agent is easy to migrate and produce "blooming phenomenon"
(4) "Black pollution" problem of rubber
In addition, peroxide itself is not safe, and it is prone to explosion during storage and transportation.
[0004] Therefore, we urgently need to design a new, effective and green cross-linking system that can avoid the use and production of toxic chemicals, avoid the generation of unpleasant odors, and make it have the reproducibility of thermoplastic elastomers, It can solve the problem that traditional rubber is difficult to recycle repeatedly

Method used

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  • Carboxyl-functionalized rubber cross-linked elastomer capable of being repeatedly processed and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] (1) Rubber mixing: take by weighing 100g acrylonitrile-butadiene-methacrylic acid copolymer glue (the copolymerization ratio of acrylonitrile unit is 26.5%, and the copolymerization ratio of methacrylic acid unit is 7%), adjust the mill roll distance to 0.5mm, keep the temperature of the roller at 50°C, and the front and rear speed ratio of the roller is 1:1.4. The rubber is masticated three times on the Φ160×320 double-roll mill, and then the roller distance of the mill is adjusted to 0.8mm to make the rubber roll , followed by adding 0.8phr transesterification catalyst zinc acetate Zn(OAc) 2 , 2phr anti-aging agent 4020, 40phr carbon black N300, 8phr epoxy soybean oil, cut twice, alternately make six triangle bags and six rolls, so that the epoxy soybean oil can be evenly dispersed, and then the film is produced.

[0047] (2) Vulcanization: vulcanize on a flat vulcanizer, and press it into a vulcanized rubber sample with a thickness of 2mm under the condition of 15MPa...

Embodiment 2

[0050] Different from Example 1, the content of carboxyl groups and the amount of crosslinking agent in the acrylonitrile-butadiene-methacrylic acid copolymer glue, in this embodiment, the carboxyl content is 30% (the copolymerization ratio of acrylonitrile units is 26.5% , the copolymerization ratio of methacrylic acid units is 30%), and the crosslinking agent consumption is 40phr. Other techniques and consumption are identical with embodiment 1.

Embodiment 3

[0052] The difference from Example 1 is the type of rubber and the type of crosslinking agent. In this embodiment, the rubber is styrene-butadiene-methacrylic acid copolymer (the copolymerization ratio of styrene units is 23.5%, methyl The copolymerization ratio of the acrylic acid unit is 3%), and the crosslinking agent is bisphenol A glycidyl ether. Other techniques and consumption are identical with embodiment 1.

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Abstract

The invention discloses a carboxyl-functionalized rubber cross-linked elastomer capable of being repeatedly processed and a preparation method thereof. The carboxyl-functionalized cross-linked elastomer is prepared by mixing and vulcanizing the following raw materials in parts by weight: 100 parts of carboxyl-functionalized rubber, 0.1-50 parts of a cross-linking agent, and 0-100 parts by weight of a transesterification catalyst. The preparation method comprises the following step: mixing and vulcanizing the above components according to the desired dosages to obtain the carboxyl-functionalized cross-linked elastomer capable of being repeatedly processed. The novel, effective and green cross-linking system can avoid the use and generation of toxic chemical substances and the generation ofunpleasant odor, allows the repeatable processability of thermoplastic elastomer to be obtained, and can solve the problem that the traditional rubber is difficult to recycle repeatedly.

Description

technical field [0001] The invention relates to the technical field of rubber vulcanization, in particular to a reprocessable carboxyl functionalized rubber cross-linked elastomer and a preparation method. This new method of rubber crosslinking is environmentally friendly and reproducible. Background technique [0002] Vulcanization refers to the process of converting linear chain polymers into three-dimensional network polymers through chemical crosslinking, and is one of the important steps to determine whether natural rubber or synthetic rubber can be converted into valuable rubber products. [0003] The commonly used vulcanization system for rubber materials is the sulfur vulcanization system, for which vulcanization accelerators and activators (zinc oxide) are essential. They can reduce the amount of sulfur, shorten the vulcanization time, lower the vulcanization temperature, and at the same time improve the degree of vulcanization and the physical and chemical propert...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L13/00C08L51/04C08L83/08C08L35/02C08L91/00C08K3/04
CPCC08L13/00C08L51/04C08L83/08C08L35/02C08L91/00C08K3/04
Inventor 张立群张刚刚王朝冯皓然郭宝春李晓林
Owner BEIJING UNIV OF CHEM TECH
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