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Medical security level rubber product with sericin modified surface and preparation method thereof

A rubber product and safety-grade technology, which is applied to medical safety-grade rubber products with sericin modified surface and its preparation field, can solve the problems of unsatisfactory effect, decreased strength of natural rubber, and decreased use performance, and achieves improved use. Comfort and hygienic safety, improved rubber strength, and resource-saving effects

Active Publication Date: 2010-05-12
湖南万橡新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] NRL contains latex proteins with high and low molecular weight. The former is a non-allergenic high-molecular protein that is firmly combined with rubber particles; the latter is an allergenic water-soluble small molecular protein that exists in whey. Most of the water-soluble Protein is removed during NRL processing, and the residual water-soluble protein is the allergen. In addition to the above-mentioned LPNRL technology, the current countermeasures include chlorination to denature the protein, but the effect is not satisfactory. NRL after chlorination The product becomes stiff, the elongation rate decreases, and the use performance decreases. At the same time, the chlorinated wastewater also causes environmental pollution. Although the LPNRL technology can remove water-soluble proteins, the high-molecular proteins will be degraded and regenerated into water-soluble proteins. What is more serious is , the reduction of protein content in NRL will lead to a substantial decrease in the strength of natural rubber.

Method used

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  • Medical security level rubber product with sericin modified surface and preparation method thereof
  • Medical security level rubber product with sericin modified surface and preparation method thereof
  • Medical security level rubber product with sericin modified surface and preparation method thereof

Examples

Experimental program
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Effect test

example 1

[0052] The preparation of example 1-sericin

[0053] Use cocoon, waste silk, and waste as raw materials, extract it with acetone for 24 hours, remove impurities, degumming with high-temperature water solution, filter sericin aqueous solution at 80 ° C, dialysis for 4 hours, then concentrate it, freeze-dry to obtain Powdered sericin with a purity of 90% or more.

example 2

[0054] Preparation of example 2-sericin hydrolyzate

[0055] The sericin obtained above is subjected to hot water treatment, that is, in 0.2% sodium carbonate aqueous solution (pH 11-12) at 95° C. for 2-4 hours, so as to extract sericin protein hydrolyzate. The obtained sericin hydrolyzate extract was filtered through a filter with an average pore diameter of 0.3um to remove focused matter. The filtrate was then desalted through a reverse osmosis membrane to obtain a 0.3% aqueous solution of clear and colorless sericin hydrolyzate.

[0056] The solution is concentrated to a concentration of about 0.3% with an evaporator, and then freeze-dried to obtain a powder-formed sericin hydrolyzate with a purity of 90% or more and an average molecular weight of 0.1×10 4 -2.0×10 4 .

example 3

[0057] The preparation of example 3-chitosan

[0058] The crudely extracted chitin is treated with 3-6 times of 60-75% concentrated sodium hydroxide at 70-95°C for 10-20 hours for deacetylation reaction to obtain crude chitosan, and then the crude chitosan product is dissolved Add 7-10 times of 2-7% dilute acetic acid, then add 10% concentrated lye to form viscous, stand at 5-30°C for 2-6 hours, neutralize with dilute acid to pH 8- 9 until flocs appear, continuously stir until the flocs stop producing, and then remove sodium chloride to obtain water-soluble chitosan with a molecular weight of 0.5×105-0.8×105 and a degree of deacetylation of 50%-95%.

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Abstract

A medical security level rubber product with sericin modified surface and a preparation method thereof belong to the technical field of the production technology of rubber and latex products. The invention discloses a sericin composite which is used for the rubber product modification so as to increase the medical security. The rubber product is characterized in that sericin, natural polysaccharides, biological protein, bio-enzyme, organic acid and salt coexist according to a certain proportions. The invention also discloses a preparation method of the rubber product. The method is characterized in that sericin composite is coated on the surface of the rubber product; and / or the sericin composite is added in the natural latex to be vulcanized, and the sericin composite migrates to the surface of the rubber product owning to the hydrophilicity during the rubber vulcanization process and forms a hydrophilic protective film so as to prevent the allergenic protein and chemical additives in the rubber product to precipitate. The positive effect of the invention is as follows: the rubber product can be used to modify the latex protein so as to increase the strength of the rubber and reach the aim of not inducing the protein allergic reaction. Therefore, the sericin waste resource is developed for recycling so as to save the resource and protect the environment.

Description

technical field [0001] The invention relates to the technical field of rubber and latex product manufacturing process and its performance and process improvement, specifically relates to the rubber product whose surface properties are modified by sericin composition. The invention also relates to in-line methods of forming such articles, particularly latex gloves and condoms. Background technique [0002] Natural rubber latex (NRL) is a renewable natural polymer colloid system, and its main components are rubber hydrocarbons, water, and non-glue substances. Natural rubber products made of NRL have excellent comprehensive performance and irreplaceability, and have been widely used in medical and health fields, such as medical catheters, urinary collection devices, enema tops, tourniquets, sphygmomanometer covers, oxygen bags, medical Gloves, Exam Gloves, Condoms, etc. Since the last century, as people's awareness of preventing AIDS, hepatitis and other viral infections has ...

Claims

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Application Information

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IPC IPC(8): C08L7/02C08L89/00C08L5/08C08L5/04C08L5/16C08L3/02C08L5/00B32B25/04C08J3/24C08J7/04
Inventor 田晓慧冯屏
Owner 湖南万橡新材料科技有限公司
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