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Method for improving oxygen aging resistance of protein-removed natural rubber

A natural rubber and aging performance technology, which is applied in the field of anti-oxidative aging control of deproteinized natural rubber, can solve the problems of oxidation reaction, instability of aldehyde group, and decline of anti-oxidative aging performance of deproteinized rubber, so as to inhibit oxidation, Improvement of anti-oxidative aging performance, effect of improving anti-oxidative aging performance

Inactive Publication Date: 2013-02-20
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

Due to the instability of aldehyde groups, oxidation reactions are prone to occur during heating and storage, resulting in a decline in the anti-oxidative aging properties of deproteinized rubber
Since the thermo-oxidative degradation of natural rubber molecular chains caused by the oxidation of aldehyde groups is not the same as the traditional thermal-oxidative degradation mechanism of natural rubber, the use of traditional free radical scavenger antioxidants naturally cannot achieve the desired goal

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Take by weighing 200 parts of dry rubber content and be the freshly prepared deproteinized natural rubber latex of 50%, add 1.2 parts of 10% (mass concentration) alanine aqueous solution, stir the pH of deproteinized natural rubber latex with ammonia water after being adjusted to 8.2 namely Can. After the deproteinized natural latex containing alanine was allowed to stand at room temperature for 24 hours, adding 2.0 parts of mass concentration successively was 50.0% sulfur water dispersion, 2.5 parts mass concentration was 40.0% diethyldithiocarbamic acid The zinc aqueous dispersion and 1.0 parts of the zinc oxide aqueous dispersion with a mass concentration of 50.0% were vulcanized according to a conventional process, and the vulcanization condition was 60° C. for 60 minutes. After standing at room temperature for 24 hours, add 2.0 parts of 2,6-di-tert-butyl-4-methylphenol aqueous dispersion with a mass concentration of 50%. The mechanical properties of the obtained fi...

Embodiment 2

[0021] Weigh 200 parts of freshly prepared deproteinized natural rubber latex with a dry rubber content of 50%, add 1.0 part of 10% (mass concentration) phenylalanine amino acid aqueous solution, stir evenly, and adjust the pH of the latex to 8.2 with ammonia water. After the deproteinized natural latex containing phenylalanine was allowed to stand at room temperature for 24 hours, 2.0 parts of mass concentration were successively added sulfur aqueous dispersions of 50.0%, 2.5 parts of mass concentrations of 40.0% diethyldithioamino The zinc formate aqueous dispersion and 1.0 parts of the zinc oxide aqueous dispersion with a mass concentration of 50.0% were vulcanized according to a conventional process, and the vulcanization condition was 60° C.×60 minutes. After standing at room temperature for 24 hours, add 2.0 parts of 2,2'-methylenebis(4-methyl-6-tert-butylphenol) aqueous dispersion with a mass concentration of 50%, and the mechanical properties of the obtained film have a...

Embodiment 3

[0023] Weigh 200 parts of deproteinized natural rubber latex with a dry rubber content of 50%, add 1.3 parts of 10% (mass concentration) cysteine ​​aqueous solution, stir evenly, and adjust the pH of the latex to 8.2 with ammonia water. After the deproteinized natural latex containing cysteine ​​was left to stand at room temperature for 72 hours, 2.0 parts of mass concentration were successively added sulfur water dispersions of 50.0%, 2.5 parts of mass concentrations of 40.0% diethyldithioamino The zinc formate aqueous dispersion and 1.0 parts of the zinc oxide aqueous dispersion with a mass concentration of 50.0% were vulcanized according to a conventional process, and the vulcanization condition was 60° C.×60 minutes. After standing at room temperature for 24 hours, add 2.0 parts of 2,2'-methylenebis(4-methyl-6-tert-butylphenol) aqueous dispersion with a mass concentration of 50%, and the mechanical properties of the obtained film have a tensile strength of 26.8 MPa, elonga...

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Abstract

The invention discloses a method for improving oxygen aging resistance of protein-removed natural rubber, which comprises the following steps of: adding amino acid into protein-removed natural rubber latex, mixing the amino acid and the rubber latex uniformly, then adjusting the pH value of the protein-removed natural rubber latex to be between 8.1 and 8.3 by adopting aqueous ammonia, protecting aldehyde groups produced after natural rubber protein removal, and inhibiting the oxidation of the aldehyde groups so as to improve the oxygen aging resistance of the protein-removed natural rubber.

Description

【Technical field】 [0001] The invention relates to a technology for controlling the anti-oxidative aging performance of deproteinized natural rubber. 【Background technique】 [0002] The natural rubber latex naturally synthesized by Hevea brasiliensis has excellent elasticity, film-forming properties and mechanical properties. Therefore, so far, surgical gloves, medical catheters, blood transfusion hoses, examination gloves and other auxiliary medical products widely used in the medical field Devices, as well as family planning products, condoms, etc., are mainly produced from concentrated natural rubber latex. [0003] With the widespread use of medical latex products, the safety of medical latex products has received more and more attention. In the process of using or even contacting medical latex products, some doctors and patients may experience allergic reactions such as skin rash, nose, conjunctivitis, asthma, etc., which may lead to shock and even endanger life in seve...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08C19/34
Inventor 余和平黄茂芳曾宗强王启方卢光曾霞
Owner AGRI PRODS PROCESSING RES INST CHINESE ACAD OF TROPICAL AGRI SCI
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