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Vulcanized rubber selective fracture crosslinking network degradation method

A technology of vulcanized rubber and cross-linked network, which is applied in the field of degradation of vulcanized rubber to selectively break the cross-linked network. The degree of linking, the selectivity of decrosslinking, and the effect of good selectivity

Inactive Publication Date: 2018-08-14
FUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the cracking reaction under high temperature and high energy in the desulfurization process, when the crosslink network is destroyed, the main chain of the rubber will be severely degraded, resulting in a sharp decrease in the performance of the reclaimed rubber. In addition, the desulfurization process is complicated to operate, consumes a lot of energy, and has a low degree of safety.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] A natural rubber sample was epoxidized by acrylate zinc vulcanization and fully swelled in toluene. Add formulation aids for selectively breaking the cross-linked network of vulcanized rubber: 100 parts of vulcanized epoxidized natural rubber, 2 parts of aluminum chloride, 100 parts of dichloroacetic acid, reaction pressure 2 MPa, reaction temperature 160 ° C, reaction time 24 hours. After the reaction, the degradation product of vulcanized rubber is obtained by separation and drying, with a yield of 90% and a cross-linking density of 3*10 -6 mol / cm 3 , with a molecular weight of 95000 g / mol.

Embodiment 2

[0021] The natural rubber sample was vulcanized and epoxidized with aluminum acrylic acid, and fully swelled in xylene. Adding formulation aids for selectively breaking the cross-linked network of vulcanized rubber: 100 parts of vulcanized epoxidized natural rubber, 10 parts of zinc chloride, 150 parts of acetic acid, reaction pressure 4 MPa, reaction temperature 180 ° C, reaction time 36 hours. After the reaction, the degradation product of vulcanized rubber was obtained by separation and drying, with a yield of 86% and a cross-linking density of 2.5*10 -6 mol / cm 3 , with a molecular weight of 60000 g / mol.

Embodiment 3

[0023] Use zinc sorbate to vulcanize and epoxidize natural rubber samples, and place them in toluene to fully swell. Add formulation aids for selectively breaking the crosslinked network of vulcanized rubber: 100 parts of vulcanized epoxidized natural rubber, 15 parts of ferric chloride, 200 parts of formic acid, reaction pressure 5 MPa, reaction temperature 200 ° C, reaction time 72 hours. After the reaction, the degradation product of vulcanized rubber is obtained by separation and drying, with a yield of 80% and a cross-linking density of 1*10 -6 mol / cm 3 , with a molecular weight of 25000 g / mol.

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Abstract

The invention discloses a vulcanized rubber selective fracture crosslinking network degradation method, and belongs to the field of waste rubber resource recovery and regeneration utilization. Firstly, vulcanized rubber is subjected to sufficient swelling in a solvent; metal chlorides are used as catalysts; organic acid is used as a decrosslinking agent; the vulcanized rubber is degraded under theproper reaction conditions; a good effect of selectively fracturing the crosslinking network is achieved; the reaction conditions are mild; the reaction efficiency is high; the yield of the obtaineddegradation rubber product is high; the method can be used for producing regeneration rubber.

Description

technical field [0001] The invention relates to a degradation method for selectively fracturing a cross-linked network of vulcanized rubber, which degrades the vulcanized rubber by selectively cross-linking the network, and belongs to the field of waste rubber resource recycling and utilization. Background technique [0002] As we all know, rubber is one of the four major strategic materials in my country. China is a big country in the production and consumption of tires and rubber products, and produces a large amount of rubber waste every year. However, my country's rubber resources are very scarce. More than 75% of natural rubber depends on foreign imports. Because most of the waste rubber is a thermosetting polymer, the complex structure is not easy to degrade, and a large amount of rubber has caused very serious environmental pollution after use. Simple landfill or incineration will cause serious pollution to the environment. It is of great social significance and pract...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J11/26C08L7/00
CPCC08J11/26C08J2307/00Y02W30/62
Inventor 林腾飞柯金煌
Owner FUZHOU UNIV
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