Natural rubber liquid slurry containing chitosan/sericin and preparation method thereof

A technology of natural rubber and chitosan solution, applied in the field of polymer chemistry, can solve the problems of easy swelling, poor oil resistance, poor organic solvent resistance, thermal oxidation aging, ozone resistance and UV resistance.

Active Publication Date: 2010-06-02
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

The rubber as the main component of natural rubber latex is non-polar rubber, which has little reaction in polar solvents, but is easy to swell in non-polar solvents, so its oil resistance and organic solvent resistance are poor.
The natural rubber molecule contains unsaturated double bonds, so its thermal oxygen aging resistance, ozone resistance and ultraviolet resistance are poor

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0015] The preparation method of the natural rubber liquid slurry that the described preparation adds chitosan / sericin is to contain the following steps successively:

[0016] 1) Chitin is deacetylated to obtain a degree of deacetylation of 50%-95% and a molecular weight of 0.5×10 5 -0.8×10 5 The water-soluble chitosan, and it is dissolved in 1% citric acid solution, makes the chitosan solution that mass fraction is 5%;

[0017] 2) Sericin is hydrolyzed to obtain a molecular weight of 0.1×10 4 -8×10 5 The water-soluble sericin protein powder is added with ionized water to make a sericin solution with a mass fraction of 10%; the extraction of sericin protein powder is to use cocoons, waste silk, or its waste as raw materials, or from silk printing and dyeing refining wastewater As a raw material, after removing impurities, degumming with high-temperature water solution, then dissolving, concentrating and drying sericin to obtain solid powder sericin;

[0018] 3) Mix the abo...

Embodiment 1

[0031] Get solid content and be 60% natural latex 100g, chitosan / sericin mixed solution 100g prepared in advance is joined in the natural latex, add an amount of ammonium laurate and deionized water, make its total solid content be 10 %, vigorously stirred for more than 2 hours to make it evenly mixed, and allowed to stand for 5 hours to prepare a natural rubber liquid slurry with chitosan / sericin added with a mass ratio of chitosan / sericin to natural latex dry rubber of 10%.

[0032] In the chitosan / sericin mixture, the mass ratio of chitosan to sericin is 8:2, and the total solid content is 2%.

Embodiment 2

[0034] Take 100 g of natural rubber latex with a solid content of 50%, add 100 g of the pre-prepared chitosan / sericin mixture into the natural rubber latex, add an appropriate amount of deionized water so that the total solid content is 15%, and stir vigorously for 2 hours Above, make it mix uniformly, let stand for 5h, make chitosan / sericin and natural latex dry glue mass ratio be 5% the natural rubber liquid slurry that adds chitosan / sericin.

[0035] In the chitosan / sericin mixture, the mass ratio of chitosan to sericin is 8:2, and the total solid content is 5%.

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Abstract

The invention discloses a natural rubber liquid slurry containing chitosan/sericin and a preparation method thereof, and belongs to the field of high polymer chemistry. The invention is characterized in that the preparation method comprises the following steps: respectively preparing a chitosan water solution and a sericin water solution, mixing the two solution, and regulating the pH value of the mixture to 9-11 by using ammonia water and a citric acid solution; and adding the obtained chitosan/sericin mixed solution to a natural latex slurry, adding a laurate surfactant, and mechanically stirring the mixture uniformly to obtain the natural rubber liquid slurry containing chitosan/sericin. The invention has the advantages that the chitosan has the functions of adsorbing water soluble proteins in the latex, inhibiting bacteria and viruses from breeding, and the like; and the sericin has the functions of oxidation resistance, allergy resistance, hydrophilia, oil resistance and the like, thereby enhancing the emulsion phase stability and the preservation effect of the natural latex. In particular, the product obtained by using the method overcomes the defects of short service life, easy aging and sticking, poor oil resistance, initiation of protein allergy and the like in the traditional natural latex product.

Description

technical field [0001] The invention belongs to the field of macromolecular chemistry, and specifically relates to a natural rubber liquid slurry added with chitosan / sericin and a preparation method thereof. Background technique [0002] Natural rubber emulsion (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. Its main components are rubber hydrocarbons, water, and non-colloidal substances, of which non-colloidal substances are mainly composed of proteins, lipids, acetone-soluble substances, water-soluble substances, and inorganic salts. After the natural latex is naturally stored for a period of time, the enzymes and bacteria in it multiply and metabolize, causing some sugars and proteins to ferment and hydrolyze, and then produce water-soluble low-level fatty acids, resulting in a decrease in the pH value of the latex, and the natural latex produces odor and occurs It solidifies natura...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L7/02C08L5/08C08L89/00C08L89/04
Inventor 田晓慧冯屏
Owner 湖南万橡新材料科技有限公司
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