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Vulcanized rubber reclaimed rubber and preparation method thereof

A technology for vulcanized rubber and reclaimed rubber, applied in the field of rubber, can solve the problems of high cost of rejuvenating agent, unsuitable for industrialization, large dosage, etc., and achieve the effects of low cost, good de-crosslinking selectivity and high molecular weight

Active Publication Date: 2020-08-28
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the technical problems of high cost, large dosage and unsuitability for industrialization of the regenerant in the prior art, the present invention provides a regenerant that can selectively break the sulfur-sulfur bond in vulcanized rubber at low temperature, and the dosage is small, Low cost, and the obtained reclaimed rubber has high molecular weight

Method used

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  • Vulcanized rubber reclaimed rubber and preparation method thereof
  • Vulcanized rubber reclaimed rubber and preparation method thereof
  • Vulcanized rubber reclaimed rubber and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] Vulcanized natural rubber preparation:

[0049] The preparation method of the vulcanized natural rubber sample that adopts in the embodiment is as follows: raw material (100 parts of natural rubber, 5 parts of zinc oxides, 2 parts of stearic acid, 0.6 part of promotor NS, 2.5 parts of sulfur) are mixed in open mill After refining, the mixed rubber sheet was vulcanized in a flat vulcanizer at 143° C. for 13 minutes to obtain the vulcanized natural rubber sample required by the embodiment.

[0050] Vulcanized rubber reclaimed rubber preparation:

[0051] Take 1.5g of vulcanized natural rubber sample, place it in 0.15L of xylene to fully swell, add 0.045g of regenerant 3,6-dioxa-1,8-octanedithiol, control the system temperature at 120°C, and keep it warm After 8 hours, add 0.15L of methanol for flocculation, take out the flocs and dry them at 50°C for 24 hours to obtain a product with a decrosslinking degree greater than 95% and a crosslinking density less than 1*10 -5 m...

Embodiment 2

[0052] Embodiment 2: Preparation of vulcanized rubber reclaimed rubber

[0053] Using 1.5g of the vulcanized natural rubber sample prepared in Example 1, after being fully swollen in 0.15L xylene, add 0.09g regenerant 3,6-dioxa-1,8-octanedithiol, control The temperature of the system is 120°C, keep it warm for 8 hours, add 0.15L of methanol for flocculation, take out the flocs and dry them at 50°C for 24 hours, the obtained product has a decrosslinking degree of more than 97% and a crosslinking density of less than 9*10 -6 mol / cm 3 , Molecular weight greater than 90000.

Embodiment 3

[0054] Embodiment 3: Preparation of vulcanized rubber reclaimed rubber

[0055] Using 1.5g of the vulcanized natural rubber sample prepared in Example 1, after being fully swelled in 0.15L xylene, add 0.15g regenerant 3,6-dioxa-1,8-octanedithiol, control The temperature of the system is 120°C, keep it warm for 10 hours, add 0.15L of methanol for flocculation, take out the flocs and dry them at 50°C for 24 hours to obtain a product with a degree of decrosslinking of 100%, a degree of decrosslinking of 100%, and a crosslinking density of less than 3*10 -6 mol / cm 3 , molecular weight greater than 100,000.

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Abstract

The invention discloses a vulcanized rubber reclaimed rubber and a preparation method thereof, and belongs to the technical field of rubber. A regenerant is provided, can selectively break sulfur-sulfur bonds in vulcanized rubber at a low temperature, and is small in dosage and low in cost, and the molecular weight of the obtained reclaimed rubber is high. The preparation method comprises the following steps: mixing vulcanized rubber with the regenerant, swelling through a solvent, and keeping the decrosslinking temperature to make the regenerant permeate into a vulcanized rubber network for decrosslinking. A good selective chain breaking effect can be achieved on sulfur-sulfur bonds in waste rubber, large-amplitude chain breaking of the crosslinked network at the relatively low temperature is achieved, the cost of the regenerant is low, and the obtained regenerated rubber is high in sol content and molecular weight.

Description

technical field [0001] The invention belongs to the field of rubber, and in particular relates to a vulcanized rubber reclaimed rubber and a preparation method thereof. Background technique [0002] As we all know, my country is a big country that uses rubber. At the same time, my country is also the largest producer of waste tires in the world. In 2017, my country produced about 340 million waste tires. In the long run, my country's waste tires will accumulate in large quantities, which will not only cause waste of resources, And occupy a large amount of land, causing serious environmental pollution. Therefore, it is very important to find a comprehensive utilization method of waste tires, reduce the dependence on external rubber resources, improve the utilization of waste rubber, and achieve high-quality recycling. [0003] Chinese patent CN102977404A proposes a method for continuously preparing reclaimed rubber with a two-stage twin-screw extruder, using a twin-screw extr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J11/28C08J3/24C08L7/00C08K13/02C08K3/22C08K5/09C08K3/06
CPCC08J3/24C08J11/28C08J2307/00C08K3/06C08K5/09C08K13/02C08K2003/2296Y02W30/62
Inventor 王文才张鑫张立群史金炜
Owner BEIJING UNIV OF CHEM TECH
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