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Natural rubber latex protein fixation method

A technology of natural rubber latex and fixing method, which is applied in the field of rubber treatment or chemical modification, can solve problems such as protein allergy in latex products, and achieve the effect of solving allergy problems, being cheap, and overcoming environmental problems.

Inactive Publication Date: 2009-12-30
SUN YAT SEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to provide a kind of immobilization method of natural rubber latex protein for the deficiencies in the prior art, to solve latex product protein allergy problem

Method used

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  • Natural rubber latex protein fixation method
  • Natural rubber latex protein fixation method
  • Natural rubber latex protein fixation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] One, the preparation of dialdehyde sodium alginate

[0043] In a black bottle, dissolve 10.00 g of sodium alginate in 600 mL of distilled water, add 100 mL of sodium periodate while stirring, and dilute the total volume of the solution to 1 L with distilled water. The molar ratio of sodium alginate to sodium periodate was 1:0.05. After 24 hours, 3.5 mL of ethylene glycol was added and stirred for 0.5 hours to terminate the reaction. Oxidized natural polysaccharides were purified by precipitation with 3 g of sodium chloride and 1 L of ethanol. The precipitate was redissolved in 500 mL of distilled water, and 500 mL of ethanol and 1 g of sodium chloride were added to precipitate again. Repeat the precipitation with 1 L of acetone containing 0.5 g of sodium chloride until its sodium salt is formed. Finally, the precipitate was stirred and washed with 500 mL of ethanol for 15 min, filtered, and dried under vacuum at room temperature.

[0044] 2. Preparation of dialdehyde...

Embodiment 2

[0048] 1. For the preparation of dialdehyde sodium alginate, see Example 1.

[0049] 2. Preparation of dialdehyde sodium alginate latex film

[0050] Take 10 g of dialdehyde sodium alginate ammonia solution with a concentration of 1% (w / w), add it to 50 g (solid content 30 g) of natural rubber latex under stirring, and weigh 40 g of the blended solution after 1 hour of action and place it horizontally in a petri dish. Dry at 50°C for 2d.

[0051] After inspection, the precipitation rate of the water-soluble protein in the latex film is about 68 μg / g (see figure 1), which is higher than the minimum allowable protein content of 50 μg / g (ASTM, 2005) for latex protein sensitization; the mechanical properties have no significant change compared with the natural latex film without adding dialdehyde sodium alginate (see image 3 ).

Embodiment 3

[0053] 1. For the preparation of dialdehyde sodium alginate, see Example 1.

[0054] 2. Preparation of dialdehyde sodium alginate latex film

[0055] Take 10 g of dialdehyde sodium alginate ammonia solution with a concentration of 5% (w / w), add it to 50 g (solid content 30 g) of natural rubber latex under stirring, and weigh 40 g of the blended solution after 1 hour of action and place it horizontally in a petri dish. Dry at 50°C for 2d.

[0056] After inspection, the precipitation rate of the water-soluble protein in the latex film is about 2 μg / g (see figure 1 ); the mechanical properties have no significant change compared with the natural latex film without dialdehyde sodium alginate (see image 3 ).

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Abstract

The invention discloses a natural rubber latex protein fixation method aiming to solve the problem of protein allergy of natural latex products; in the method, dialdehyde polysaccharide ammonia water solution is added in natural latex and then films can be prepared by standing and drying; wherein, the dialdehyde polysaccharide is prepared by oxidizing natural polysaccharide with sodium periodate. The invention uses the aldehyde group of the oxidized polysaccharide to process a crosslinked action with proteins and increases the molecular weight of the proteins to enable the proteins to lose water-solubility; in addition, the invention uses the structure characteristic that interpenetrating polymer networks can be formed by using polysaccharide and latex and fixes proteins which lose water-solubility firmly in the latex film. The method provided by the invention overcomes the defects that the latex stability and the mechanical properties of the obtained rubber products are poor in the traditional methods such as enzymic degradation method, avoids the environmental problems caused by chlorination treatment and has low production cost, thus having a wide application prospect in rubber industry.

Description

technical field [0001] The invention belongs to the technical field of rubber treatment or chemical modification, and in particular relates to a treatment method for protein in natural latex. Background technique [0002] Natural rubber latex (NRL) is a biosynthetic polymer water-based colloid system, with poly-cis-1,4-isoprene as the main body and more than a dozen components. At present, the annual output of impregnated products in the world is about 800,000 tons. These products include medical gloves, special protective gloves for nuclear industry, rubber hoses, medical catheters, balloons, condoms, baby pacifiers and finger cots. Among them, the largest consumption is various types of gloves, accounting for more than 70%. Natural rubber latex has become the main raw material for the production of dipped products because of its good film-forming properties and high gel strength. However, there are water-soluble proteins in natural rubber, which have been reported to cau...

Claims

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Application Information

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IPC IPC(8): C08C1/00C08L7/02C08L89/00C08L5/04C08L5/08C08L3/04C07K17/10
Inventor 陈继平张黎明
Owner SUN YAT SEN UNIV
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