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Pre-vulcanized natural rubber latex/chitosan blended membrane material and preparation method thereof

A technology of natural latex and chitosan, applied in natural rubber coatings, chitin coatings, hyaluronic acid coatings, etc., can solve the problem that it is not suitable for ion deposition method or direct dipping method or casting method or extrusion latex products, etc. question

Inactive Publication Date: 2010-10-27
湛江市博大橡胶制业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method involves the use of large equipment such as vulcanizers, and is suitable for the production of dry rubber products, but it is not suitable for latex products manufactured by relatively simple processes such as ion deposition method or direct immersion method or casting method or extrusion method.

Method used

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  • Pre-vulcanized natural rubber latex/chitosan blended membrane material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] a. After stabilizing the concentrated natural rubber latex with a dry rubber content of 100 parts, add the mixed vulcanizing agent dispersion, heat at 60°C for 2 hours, and after standing for 3 days, filter to obtain pre-vulcanized natural rubber latex. The amount added is concentrated natural latex dry rubber 1.0% of anti-aging agent Wingstay L, spare.

[0030] b. Add 2.0 parts of fatty alcohol polyoxyethylene ether with a concentration of 10% to the pre-vulcanized latex prepared in "a", and continue stirring for 0.5h, then quickly add acetic acid with a concentration of 36% under high-speed stirring, and The pH is adjusted to 4 to obtain acidified pre-vulcanized natural rubber latex.

[0031] c. Dissolving 1 part, 3 parts and 5 parts of chitosan with a deacetylation degree greater than 90% with 1% acetic acid solution respectively to form a 2% chitosan acetic acid solution.

[0032] d. Add the chitosan dilute acetic acid solution prepared in "c" into the acidified pre-...

Embodiment 2

[0036] a. After stabilizing the concentrated natural rubber latex with a dry rubber content of 100 parts, add the mixed vulcanizing agent dispersion, heat at 60°C for 2 hours, and after standing for 3 days, filter to obtain pre-vulcanized natural rubber latex. The amount added is concentrated natural latex dry rubber 1.0% of anti-aging agent Wingstay L, spare.

[0037] b. Add 2.5 parts of fatty alcohol polyoxyethylene ether with a concentration of 10% to the pre-vulcanized latex prepared in "a", and continue stirring for 0.5 to 1.0 hours, then quickly add acetic acid with a concentration of 36% under high-speed stirring , adjust its pH to 4 to obtain acidified pre-vulcanized natural rubber latex.

[0038] c. Dissolving 7 parts and 10 parts of chitosan with a degree of deacetylation greater than 90% with 1% acetic acid solution respectively to form a 2% chitosan acetic acid solution.

[0039] d. Add the dilute chitosan acetic acid solution prepared in "c" into the acidified pr...

Embodiment 3

[0042] a. After stabilizing the concentrated natural rubber latex with a dry rubber content of 100 parts, add the mixed vulcanizing agent dispersion, heat at 60°C for 2 hours, and after standing for 3 days, filter to obtain pre-vulcanized natural rubber latex. The amount added is concentrated natural latex dry rubber 1.0% of anti-aging agent Wingstay L, spare.

[0043] b. Add 3.0 parts of fatty alcohol polyoxyethylene ether with a concentration of 10% to the pre-vulcanized latex prepared in "a", and continue stirring for 0.5 to 1.0 hours, then quickly add acetic acid with a concentration of 36% under high-speed stirring , adjust its pH to 4 to obtain acidified pre-vulcanized natural rubber latex.

[0044] c. Dissolving 15 parts and 20 parts of chitosan with a degree of deacetylation greater than 90% with 1% acetic acid solution respectively to form a 2% chitosan acetic acid solution.

[0045] d. Add the chitosan dilute acetic acid solution prepared in "c" into the acidified p...

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Abstract

The invention provides a pre-vulcanized natural rubber latex / chitosan blended membrane material and a preparation method thereof. The blended membrane material comprises the following components in part by dry weight: 100 parts of pre-vulcanized natural rubber latex and 1 to 20 parts of chitosan. The preparation method comprises the following steps of: pre-vulcanizing condensed natural rubber latex, fully stabilizing the pre-vulcanized natural rubber latex by using a stabilizing agent, then regulating the pH value of the pre-vulcanized natural rubber latex to 4 by using a regulator, then adding acetic acid solution of the chitosan into the pre-vulcanized natural rubber latex, and preparing the pre-vulcanized natural rubber latex / chitosan blended membrane material by a conventional process for producing rubber latex products with consolidation forming, leaching, drying and the like. The material has better tensile property, tearing resistance, ageing resistance, hydrophilic property and biocompatibility than the natural rubber latex, and can be used for the production of medicinal rubber latex products such as surgery gloves, medicinal examination gloves, catheters, condoms, drainage tubes and the like.

Description

【Field of Invention】 [0001] The invention relates to a natural rubber-based blend material and a preparation method thereof, in particular to a prevulcanized natural rubber latex / chitosan blend film material and a preparation method thereof. 【technical background】 [0002] Natural rubber latex is a biosynthetic polymer material mainly from Hevea brasiliensis. Fresh natural latex is weakly alkaline and negatively charged. In order to facilitate transportation, storage and application, it is concentrated into a concentrated natural rubber latex with a dry rubber content of more than 60%. Usually, a certain amount of ammonia is added as a preservative to prevent the latex from deteriorating. Concentrated natural rubber latex has a pH above 9. Natural rubber latex has excellent comprehensive properties such as film-forming properties, wet gel strength, elasticity, film strength and elongation, and easy vulcanization, so it has been widely used, especially for the preparation of...

Claims

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Application Information

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IPC IPC(8): C08L7/02C08L5/08C09D107/02C09D105/08
Inventor 卢光余和平曾宗强罗勇悦
Owner 湛江市博大橡胶制业有限公司
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