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Pre-sulfurization method of natural latex and latex product

A natural latex and pre-vulcanization technology, applied in the field of natural rubber processing, can solve the problems of inability to popularize and apply, low cross-linking density, poor mechanical properties of products, etc., and achieve the effect of being beneficial to production management and solving frost spraying

Active Publication Date: 2019-10-01
AGRI PRODS PROCESSING RES INST CHINESE ACAD OF TROPICAL AGRI SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Using peroxide vulcanization system and radiation vulcanization technology to vulcanize natural rubber latex, the cross-linking bonds formed between rubber molecular chains are carbon-carbon single bonds. Although the anti-oxidative aging performance is high, the cross-linking density is low and the mechanical properties of products poor
To date, neither technology has been able to scale up

Method used

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  • Pre-sulfurization method of natural latex and latex product
  • Pre-sulfurization method of natural latex and latex product
  • Pre-sulfurization method of natural latex and latex product

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Weigh 16666 parts of concentrated natural rubber latex with a total solid mass fraction of 60%, and add it into a vulcanization reactor with a heating jacket. Under stirring conditions, add 100 parts of 20% potassium hydroxide aqueous solution, 100 parts of 20% Pingpinga "O" aqueous solution and 1500 parts of 20% diallyl monosulfide emulsification aqueous solution. After about ten minutes, under stirring conditions, 80 parts by mass fraction of 20% cumene hydrogen peroxide emulsified aqueous solution and 20 parts by mass fraction of 50% tetraethylenepentamine aqueous solution were added. Vulcanized at room temperature for 24 hours under the protection of nitrogen to obtain pre-vulcanized natural rubber latex.

Embodiment 2

[0042] Weigh 16666 parts of concentrated natural rubber latex with a total solid mass fraction of 60%, and add it into a vulcanization reactor with a heating jacket. Under stirring conditions, add 100 parts of 20% potassium hydroxide aqueous solution, 100 parts of 20% Pingpinga "O" aqueous solution and 1400 parts of 20% diallyl disulfide emulsification aqueous solution. After about ten minutes, under stirring conditions, 80 parts by mass fraction of 20% cumene hydrogen peroxide emulsified aqueous solution and 25 parts by mass fraction of 50% tetraethylenepentamine aqueous solution were added. Vulcanized at room temperature for 24 hours under the protection of nitrogen to obtain pre-vulcanized natural rubber latex.

Embodiment 3

[0044] Weigh 16666 parts of concentrated natural rubber latex with a total solid mass fraction of 60%, and add it into a vulcanization reactor with a heating jacket. Under stirring conditions, add 100 parts of 20% potassium hydroxide aqueous solution, 100 parts of 20% Pingpinga "O" aqueous solution and 600 parts of 20% diallyl disulfide emulsification Aqueous solution, 1000 parts by mass fraction is 20% diallyl trisulfide emulsified aqueous solution. After about ten minutes, under stirring condition, 90 parts by mass fraction of 20% cumene hydrogen peroxide emulsified aqueous solution and 30 parts by mass fraction of 50% tetraethylenepentamine aqueous solution were added. Vulcanized at room temperature for 24 hours under the protection of nitrogen to obtain pre-vulcanized natural rubber latex.

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Abstract

The invention provides a pre-sulfurization method of natural latex and a latex product. The pre-sulfurization method of the natural latex comprises the step that with diallyl sulfide as a sulfurization agent, under the effect of a radical initiator, the natural latex is pre-sulfurized. The latex product is prepared from the pre-sulfurized natural latex which is prepared by using the pre-sulfurization method of the natural latex. According to the pre-sulfurization method of the natural latex, cross-linked bonds formed after pre-sulfurization are basically identical to those of a traditional sulfur sulfurization system and are multi-sulfur bonds or single-sulfur bonds, and the performance of sulfurized rubber membranes is basically identical; the sulfurized rubber membrane corresponding to the pre-sulfurized natural latex prepared by adopting the method is transparent and free of nitrosamine residues and zinc pollution, and the problem can be thoroughly solved that the surface of the latex product is sprayed with frost; the sulfurization degree of the sulfurized natural latex basically keeps invariant, and the natural latex can be stored for a long time, which is beneficial to production and management of downstream firms.

Description

technical field [0001] The invention relates to the field of natural rubber processing, in particular to a method for pre-vulcanizing natural latex and latex products. Background technique [0002] So far, almost all latex products are produced using pre-vulcanized natural rubber latex prepared by sulfur vulcanization system. The sulfur vulcanization system uses sulfur as the vulcanizing agent, under the action of accelerators and active agents, under certain reaction conditions, the rubber hydrocarbon molecular chains in the natural rubber latex particles are cross-linked to form a three-dimensional network structure. Since the cross-linking bonds formed between the rubber molecular chains in the sulfur vulcanization system are mainly polysulfide bonds, the vulcanized rubber film has excellent tear strength, tear resistance and elongation at break, but its anti-oxidative aging performance is poor. . The vast majority of vulcanization compounding agents are solid powder co...

Claims

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Application Information

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IPC IPC(8): C08J3/26C08L7/02C08K5/372C08F253/00C08F228/02
CPCC08F253/00C08J3/26C08J2307/02C08K5/372C08F228/02
Inventor 潘琪刘宏超王启方余和平
Owner AGRI PRODS PROCESSING RES INST CHINESE ACAD OF TROPICAL AGRI SCI
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