Sericin graft-modified natural latex, preparation method and applications thereof

A technology of natural latex and graft modification, applied in the field of preparation, sericin graft modification of natural latex, can solve the problems of complex process, high cost, reduced mechanical properties of latex products, etc., to achieve good modification effect, reduce content, the effect of reducing the possibility of inducing allergic reactions

Inactive Publication Date: 2014-03-12
SHANGHAI GENIUS ADVANCED MATERIAL (GRP) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Research on solving and improving latex protein allergy has attracted more and more attention. The main solutions reported at present include deproteinization, surface chlorination, and finding alternative products. However, these methods generally have problems such as high cost and complicated process. Reduction will lead to a great reduction in the mechanical properties of latex products

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] (1) Preparation of sericin aqueous solution:

[0045] Cut commercially available cocoons into about 0.5cm 3 After the block is formed, weigh 50g to wash with shaking water, and then rinse with deionized water; after washing, add 300ml of deionized water, put it into a flask for a 100°C water bath, and keep boiling for 3 hours after boiling, then stop heating; After hot suction filtration, freeze-dry the obtained solution at -30°C for 24 hours to obtain 13.5 g of sericin powder; add 100 ml of deionized water to the sericin powder, stir evenly for 10 minutes to fully dissolve it, and obtain Concentration is the sericin aqueous solution of 11.9%, for subsequent use;

[0046] (2) Sericin modified natural latex radical polymerization reaction, wherein the natural latex is natural latex concentrated with ammonia water, the total solid mass content is 61.53%, and the dry rubber mass content is 60.19%, including the following specific steps:

[0047] (2-1) After passing nitro...

Embodiment 2

[0052](1) Preparation of sericin aqueous solution:

[0053] Cut commercially available cocoons into about 1.0cm 3 After the block is formed, weigh 50g to wash with shaking water, and then rinse with deionized water; add 400ml of deionized water after washing, put it into a flask for a water bath at 105°C, keep boiling for 4 hours after boiling, and then stop heating; After hot suction filtration, freeze-dry the obtained solution at -40°C for 18 hours to obtain 14.3 g of sericin powder; add 100 ml of deionized water to the sericin powder, stir evenly for 10 minutes to fully dissolve it, and obtain Concentration is the sericin aqueous solution of 12.5%, for subsequent use;

[0054] (2) Sericin modified natural latex radical polymerization reaction, wherein the natural latex is natural latex concentrated with ammonia water, its total solid mass content is 55.00%, and the dry rubber mass content is 52.00%, including the following specific steps:

[0055] (2-1) After passing nitr...

Embodiment 3

[0060] (1) Preparation of sericin aqueous solution:

[0061] Cut commercially available cocoons into about 1.5cm 3 After the block is formed, weigh 70g to wash with shaking water, and then rinse with deionized water; after washing, add 500ml of deionized water, put it in a water bath at 110°C, keep boiling for 3.5 hours after boiling, and then stop heating; After suction filtration while it was hot, freeze-dry the obtained solution at -50°C for 12 hours to obtain 20.9 g of sericin powder; add 100 ml of deionized water to the sericin powder and stir evenly for 10 minutes to fully dissolve it. Obtaining concentration is the sericin aqueous solution of 17.3%, for subsequent use;

[0062] (2) Sericin modified natural latex radical polymerization reaction, wherein the natural latex is natural latex concentrated with ammonia water, the total solid mass content is 50.00%, and the dry rubber mass content is 49.00%, including the following specific steps:

[0063] (2-1) After passing...

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PUM

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Abstract

The invention belongs to the technical field of rubber chemical modification, and discloses a sericin graft-modified natural latex, a preparation method and applications thereof. The natural latex comprises following ingredients, by weight, 50 to 100 parts of natural latex, 25.3 to 69.6 parts of a sericin water solution, 0.2 to 1.0 part of a first initiator, and 0.2 to 1.0 part of a second initiator. The preparation method comprises following step: in nitrogen atmosphere, 50 to 100 parts of natural latex and 25.3 to 69.6 parts of the sericin water solution are stirred with a uniform speed; 0.2 to 1 part of the first initiator is added dropwise; and 0.2 to 1.0 of the second initiator is added dropwise at a uniform speed; and an obtained mixture is subjected to polymerization, and is allowed to stand so as to obtain the sericin graft-modified natural latex. The preparation method is based on surface energy difference of sericin and natural latex, and sericin is gathered at the surface of natural latex so as to isolate allergic proteins. At the same time, hydrogen-bond interaction between amino acids in sericin and allergic water soluble proteins in natural laxe is induced, and the allergic water soluble proteins are denatured, so that occurrence possibility of induced allergic reaction is reduced greatly without influencing rubber physical and mechanical properties.

Description

technical field [0001] The invention belongs to the technical field of chemical modification of rubber, and relates to a sericin graft-modified natural latex, a preparation method and an application thereof. Background technique [0002] Natural rubber emulsion is a product secreted by artificially cultivated Hevea trifoliate trees. It is a biosynthetic polymer water-based colloid system. The main component is polycis-1,4-isoprene, which accounts for more than 90% of the system. , and also contains more than a dozen other components, including water, non-colloidal substances, rubber hydrocarbons and other components. Among them, non-colloidal substances are mainly composed of proteins, lipids, inorganic salts, water-soluble substances, acetone-soluble substances, etc., and protein accounts for 1% to 2% of latex. About 20% of these proteins are distributed on the surface of rubber particles, which is an important material for the protective layer of rubber particles, about 6...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F299/00C08F4/40
Inventor 宋玲
Owner SHANGHAI GENIUS ADVANCED MATERIAL (GRP) CO LTD
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