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Cross linking technology for improving anti-tearing performance of prevulcanized natural rubber latex film

A technology of natural rubber latex and pre-vulcanization, which is applied in the field of cross-linking to improve the tear resistance of pre-vulcanized natural rubber latex films, and can solve the problem that the improvement range is not too large

Inactive Publication Date: 2011-05-25
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

[0005] Although the above method is helpful to improve the tear resistance of natural rubber latex products, the improvement rate is not too large.

Method used

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  • Cross linking technology for improving anti-tearing performance of prevulcanized natural rubber latex film

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] 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 the anti-aging agent Wingstay L, spare;

[0027] 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 Its pH is adjusted to be 4, obtains acidified pre-vulcanized natural rubber latex;

[0028] c. Dissolving 1 part of chitosan with a degree of deacetylation greater than 90% with 1% acetic acid solution into a 2% chitosan acetic acid solution;

[0029] d. Add the chitosan dilute acetic acid solution prepared in "c" into the acidified pre-vulcanized natural rubber ...

Embodiment 2

[0034] 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 the anti-aging agent Wingstay L, spare;

[0035] 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 Its pH is adjusted to be 4, obtains acidified pre-vulcanized natural rubber latex;

[0036] c. 3 parts of chitosan with deacetylation degree greater than 90% are dissolved into 2% chitosan acetic acid solution with 1% acetic acid solution respectively;

[0037] d. Add the chitosan dilute acetic acid solution prepared in "c" into the acidified pre-vulcanized natural...

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 The anti-aging agent WingstayL of 1.0% of content, standby;

[0043] 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 1.0 h, then quickly add acetic acid with a concentration of 36% under high-speed stirring, and Its pH is adjusted to be 4, obtains acidified pre-vulcanized natural rubber latex;

[0044] c. dissolving 5 parts of chitosan with a degree of deacetylation greater than 90% with 1% acetic acid solution into a 2% chitosan acetic acid solution;

[0045] d. Add the dilute chitosan acetic acid solution prepared in "c" into the acidified pre-vulcanized n...

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Abstract

The invention provides a cross linking technology for improving the anti-tearing performance of a prevulcanized natural rubber latex film, which comprises the following steps: firstly, using a method of CN11870778A for preparing a prevulcanized natural rubber / chitosan blended rubber film, then, treating the blended rubber film in a cross linking agent capable of realizing the cross linking of chitosan so that a natural rubber cross linking network formed through prevulcanizing and a chitosan cross linking network form a mutually penetrating polymer network, and then, carrying out leaching and drying to obtain a prevulcanized natural rubber / chitosan mutually penetrating polymer network blended film material. The anti-tearing intensity of the material is between 60.3 kN / m and 113.9 kN / m which is improved by 15.9 to 69.5 kN / m through being compared with that of a pure prevulcanized natural rubber latex film, the anti-tearing performance of the prevulcanized natural rubber latex film is greatly improved, the tensile strength is 16.9 to 24.5 MPa, the stretching extension rate is 602 to 843 percent, good elastic performance is maintained when high tearing intensity is obtained, and the cross linking technology can be used for producing medical and daily use rubber latex products such as industrial gloves, domestic gloves, surgery operation gloves, medical examination gloves, catheters, condoms, draught tubes, ruber tubes for body-building apparatuses such as puller rubber tubes, rubber sheets and the like.

Description

【Field of Invention】 [0001] The invention relates to a preparation method of a natural rubber-based blending material, in particular to a crosslinking technology for improving the tear resistance of a prevulcanized natural rubber latex film. 【technical background】 [0002] Natural rubber latex is a biosynthetic polymer material mainly from Hevea brasiliensis, which has excellent comprehensive properties such as film-forming properties, wet gel strength, softness and elasticity, film tensile strength and elongation, and easy vulcanization. Widely used in the preparation of various latex products, especially suitable for the preparation of medical equipment products such as condoms, surgical gloves, medical examination gloves and other film products, as well as various medical drainage tubes such as urinary catheters and T-shaped bile duct drainage tubes, although natural latex The product itself has poor aging resistance and tear resistance, and its biocompatibility is not as...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J7/12C08J3/24C08L7/02C08L5/08
Inventor 卢光余和平曾宗强罗勇悦
Owner AGRI PRODS PROCESSING RES INST CHINESE ACAD OF TROPICAL AGRI SCI