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Method for improving quality of concentrated natural latex

A natural latex quality technology, applied in the field of quality control of concentrated natural latex, can solve the problems of latex products such as the decline in anti-oxidative aging performance, and achieve the effect of improving anti-oxidative aging performance and improving quality

Inactive Publication Date: 2012-03-07
AGRI PRODS PROCESSING RES INST CHINESE ACAD OF TROPICAL AGRI SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This is likely to be one of the reasons for the decline in the anti-oxidative aging performance of latex products

Method used

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  • Method for improving quality of concentrated natural latex
  • Method for improving quality of concentrated natural latex
  • Method for improving quality of concentrated natural latex

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Take by weighing 250 parts of dry glue content and be the fresh natural rubber latex that the ammoniacal liquor of 40% preserves, add 2.0 parts of 5% diammonium hydrogen phosphate aqueous solution, 1 part of 5% ammonium ethylenediamine tetraacetate aqueous solution, mix well, and stand at room temperature for 1 Hours later, the centrifugal concentration can be carried out according to the conventional production process. The concentrated natural rubber latex of gained is stored naturally, is sampled every 3 months, vulcanizes and forms a film according to a conventional process, wherein 1.0 part of sulfur consumption, 1.0 part of zinc diethyldithiocarbamate consumption, 0.5 part of zinc oxide consumption, The vulcanization condition is 60° C.×60 minutes. After standing at room temperature for 24 hours, add 1.0 parts of 2,2'-methylenebis(4-methyl-6-tert-butylphenol), and the mechanical properties of the obtained film after aging at 70°C for 72 hours are as follows:

[0...

Embodiment 2

[0022] Take by weighing 333 parts of dry rubber content and be the fresh natural rubber latex that the ammoniacal liquor of 30% preserves, add 3 parts of 5% diammonium hydrogen phosphate aqueous solution, 1 part of 5% ammonium ethylenediamine tetraacetate aqueous solution, mix well, and stand at room temperature for 1 Hours later, the centrifugal concentration can be carried out according to the conventional production process. The concentrated latex of gained is stored naturally, is sampled every 3 months, vulcanizes and forms a film according to a conventional process, wherein the sulfur consumption is 1.0 part, the zinc diethyldithiocarbamate consumption 1.0 part, the zinc oxide consumption 0.5 part, vulcanization The conditions are 60°C x 60 minutes. After standing at room temperature for 24 hours, add 1.0 parts of 2,6-di-tert-butyl-4-methylphenol, and the mechanical properties of the obtained film after aging at 70°C for 72 hours are as follows:

[0023] Table 2 Mechanic...

Embodiment 3

[0027] Take by weighing 400 parts of dry glue content and be the fresh natural rubber latex that the ammoniacal liquor of 25% preserves, add 2 parts of 5% diammonium hydrogen phosphate aqueous solution, 1 part of 5% ammonium ethylenediamine tetraacetate aqueous solution, after mixing evenly, leave standstill at room temperature for 1 Hours later, the centrifugal concentration can be carried out according to the conventional production process. Store the treated concentrated latex naturally, take samples every 3 months, vulcanize and form a film according to the conventional process, wherein the dosage of sulfur is 1.0 parts, the dosage of zinc diethyldithiocarbamate is 1.0 parts, and the dosage of zinc oxide is 0.5 parts , The vulcanization condition is 60°C×60 minutes. After standing at room temperature for 24 hours, add 1.0 parts of 4,4'-methylenebis(2,6-di-tert-butylphenol), and the mechanical properties of the obtained film after aging at 70°C for 72 hours are as follows: ...

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Abstract

The invention discloses a method for improving quality of concentrated natural latex, which comprises the following steps of: adding diammonium hydrogen phosphate and ethylene-diamine tetraacetic acid ammonium into fresh natural latex, mixing the natural latex uniformly, standing the natural latex for at least 2 hours, then performing centrifugal concentration on the natural latex according to a conventional production process for concentrating the natural latex, and removing calcium and magnesium ions from the fresh natural latex so as to improve the quality of the concentrated natural latexand improve the anti-oxidation and anti-aging performance of various latex products.

Description

【Technical field】 [0001] The invention relates to the quality control technology of concentrated natural rubber latex. 【Background technique】 [0002] Commonly used natural rubber mainly refers to a polymer material naturally synthesized by Hevea brasiliensis, which can be divided into natural rubber raw rubber and concentrated natural latex according to process requirements. Natural rubber latex has excellent elasticity, film-forming and mechanical properties. Therefore, so far, surgical gloves, medical catheters, blood transfusion hoses, examination gloves and other auxiliary medical devices widely used in the medical field, as well as condoms for family planning products, etc. , mainly produced from concentrated natural rubber latex. [0003] At present, concentrated natural rubber latex is mainly produced by centrifugal concentration process, using ammonia water as a stable system, and the technical indicators meet the requirements of the national standard "GB / T 8289 Co...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L7/02C08K13/02C08K3/32C08K5/17
Inventor 余和平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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