Method for immobilizing proteins in natural rubber latex by aid of modified tannin extract

A technology of natural rubber latex and protein, which is applied in the field of fixing natural rubber latex protein by using modified tannin extract, which can solve the adverse effects of raw rubber drying rate and oxidation resistance on the mechanical properties of rubber products, and it is difficult to realize on-site preparation and use, latex Colloidal system stability decline and other problems, to achieve the effect of feasible process, easy control, mild reaction conditions and easy control

Inactive Publication Date: 2017-01-11
YUNNAN NORMAL UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

One is to remove protein, including multiple leaching of rubber products, centrifugation of latex, hydrolysis of protein by protease or acid or alkali, centrifugation after radiation vulcanization of latex, and adsorption of protein by adsorbent. The disadvantage of this scheme is that , as the protein content in the latex decreases, the stability of the latex colloidal system decreases, and the drying rate and oxidation resistance of raw rubber and the mechanical properties of rubber products will also be adversely affected
The second is that chlorination denatures the protein, but this will reduce the elongation of the rubber product and affect the use of the product.
The third is to use a fixative to stabilize the protein. The fixative used includes dialdehyde sodium alginate (Chinese invention patent, application number 200910041291.8, authorized announcement date July 6, 2011), chitosan/sericin (Chinese invention patent, Application No. 2

Method used

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  • Method for immobilizing proteins in natural rubber latex by aid of modified tannin extract
  • Method for immobilizing proteins in natural rubber latex by aid of modified tannin extract

Examples

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Embodiment 1

[0020] In 1 weight part of the mass percentage content of 10% ammonia solution, under the stirring condition of 60 rpm, add 1 weight part of the mass percentage content of 20% sodium sulfite aqueous solution, add 15 weight parts of the mass percentage content of A 20% aqueous solution of commercially available powdered Acacia quinquefolium extract was stirred for 15 minutes, and then reacted at 60° C. for 1 hour to obtain a modified Acacia quinquefolium solution. The modified Acacia manzhani solution was left at room temperature for 90 minutes, then centrifuged at 8000 rpm for 15 minutes, and the supernatant was collected to obtain the purified modified Acacia manzanzi solution. Under room temperature conditions, according to the ratio of adding 1 weight part of solid modified acacia acacia in the natural rubber latex of every 100 parts by weight, the modified acacia acacia solution of purification is added in the high-ammonia concentrated natural rubber latex, and stirred to m...

Embodiment 2

[0022]In 1 weight part of the mass percentage content of 25% ammonia solution, under the stirring condition of 30 rev / min, add 3 weight parts of the mass percentage content of 30% hydrogen peroxide solution, add 20 weight parts of the mass percentage The aqueous solution of commercially available powdered oak extract with a content of 20% was stirred for 30 minutes, and then reacted at 30°C for 1 hour to obtain a modified rubber extract solution. The modified rubber bowl solution was left at room temperature for 60 minutes, then centrifuged at 6000 rpm for 30 minutes, and the supernatant was collected to obtain a purified modified rubber bowl solution. At room temperature, according to the ratio of adding 0.2 parts by weight of solid modified rubber latex in every 100 parts by weight of natural rubber latex, the modified rubber bowl solution of increasing purity is added in high-ammonia concentrated natural rubber latex, and stirred to make the modification The rubber bowl is ...

Embodiment 3

[0024] In 1 weight part of the mass percentage content of 15% ammonia solution, under the stirring condition of 45 rpm, add 1 weight part of the mass percentage content of 20% potassium sulfite aqueous solution and 1 weight part of the mass percentage content To a 20% hydrogen peroxide solution, add 25 parts by weight of an aqueous solution of commercially available powdered bayberry extract with a mass percentage of 30%, stir for 30 minutes, and then react at 50° C. for 1 hour to obtain a modified bayberry solution. The modified bayberry solution was left at room temperature for 30 minutes, then centrifuged at 8000 rpm for 30 minutes, and the supernatant was collected to obtain a purified modified bayberry solution. Under room temperature conditions, according to the ratio of adding 2 parts by weight of solid modified red bayberry in the natural rubber latex of every 100 parts by weight, the modified red bayberry solution of increasing purity is added in the high-ammonia conce...

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Abstract

The invention discloses a method for immobilizing proteins in natural rubber latex by the aid of modified tannin extract. The method is characterized by comprising steps of adding, by weight, more than 0.2 part of solid modified tannin extract into 100 parts of natural rubber latex and carrying out film formation, leaching, drying and vulcanization processing on rubber products according to conventional proportions and processes for the rubber products. The contents of extractable water-soluble proteins in the prepared rubber products are lower than 100 micro-g/dm<2>; the rubber products are natural rubber glove products manufactured by means of impregnation; the natural rubber latex is high-ammonia concentrated latex; the modified tannin extract is a modified product of powdery tannin extract which is a commercially available commodity. The method has the advantages that the modified tannin extract prepared by means of one-step reaction is used as a protein immobilizing agent, accordingly, the problem of protein allergy of existing natural rubber products can be solved, the mechanical properties, the ageing resistance and the hydrophilic performance of the rubber products can be improved, and the application range of tannin extract can be expanded.

Description

technical field [0001] The invention belongs to the technical field of rubber processing, and in particular relates to a method for fixing natural rubber latex protein by using modified tannin extract. Background technique [0002] Natural rubber emulsion is a biosynthetic high polymer water-based colloid system, the main components are rubber hydrocarbons (polyisoprene), water, non-colloidal substances, of which non-colloidal substances include proteins, lipids, acetone soluble substances, water-soluble substances, inorganic salts, etc. Natural rubber latex has excellent process operation and physical properties. It has high wet gel strength, high elasticity, and low creep. It is widely used in the production of impregnated products, including medical gloves, special protective gloves for the nuclear industry, and balloons. In terms of versatility, there is no other material that can completely replace it. Natural rubber is still the best choice for isolation of viruses, i...

Claims

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Application Information

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IPC IPC(8): C09C1/00C08L7/02C08L93/00C09F1/04
CPCC09C1/00C08L7/02C09F1/04C08L93/00
Inventor 陈继平龚英张学宴陈耿锋
Owner YUNNAN NORMAL UNIV
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