Production method of low-protein concentrated natural latex

A natural rubber latex and production method technology, applied in the field of low-protein concentrated natural rubber latex, can solve the problems affecting the deproteinization effect of concentrated natural rubber latex, the difference in stability and processing characteristics, and the influence of protease activity, etc., to achieve stable activity, stable product quality, and raw materials. low cost effect

Inactive Publication Date: 2012-10-03
YUNNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The common method of inactivating enzymes is: at 70 o C for 3h or at 85 o The condition of C has been processed for 10 minutes, so the problems are that the equipment investment is large, the energy consumption is high, and the operation is difficult.
On the other hand, enzyme activity may affect protease activity due to temperature factors
In these production methods, the main problem is that the activity of the enzyme is different under different temperature conditions, which will affect the deproteinization effect of the concentrated natural rubber latex, and will also lead to differences in stability and processing characteristics.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Take 100kg fresh latex, add 200g ammonium laurate stabilizer, stir for 1h, add rubber vulcanization accelerator and zinc oxide 30g, after that, in 25 o Under the temperature condition of C, add 1.0L low-temperature alkaline protease (dissolved in water) with a mass percentage of 1% to the fresh latex, and stir for 10 hours; when the nitrogen content of the concentrated latex drops to less than 0.12% by mass, add lauric acid Ammonium 30g, after centrifugation and concentration, ammonium supplemented to 0.07% (mass percentage), and finally 6g of EDTA was added to the concentrated milk to inhibit enzyme activity and preserved. Obtain 17.4kg of low-protein natural concentrated latex with a nitrogen content of 0.11%.

Embodiment 2

[0018] Take 100kg fresh latex, add 200g ammonium laurate stabilizer, stir for 1h, add rubber vulcanization accelerator and zinc oxide 30g, after that, in 37 o Under the temperature condition of C, add 1.2L low-temperature alkaline protease (dissolved in water) with a mass percentage of 1% to the fresh latex, and stir for 16 hours; when the nitrogen content of the concentrated latex drops to less than 0.12% by mass, add lauric acid Ammonium 30g, after centrifugation and concentration, ammonium supplemented to 0.07% (mass percentage), and finally 6g of EDTA was added to the concentrated milk to inhibit enzyme activity and preserved. 18.1 kg of low-protein natural concentrated latex was obtained with a nitrogen content of 0.10%.

Embodiment 3

[0020] Take 100kg fresh latex, add 200g ammonium laurate stabilizer, stir for 1h, add rubber vulcanization accelerator and zinc oxide 30g, after that, in 30 o Under the temperature condition of C, add 1.5L low-temperature alkaline protease (dissolved in water) with a mass percentage of 1% to the fresh latex, and stir for 24 hours; when the nitrogen content of the concentrated latex drops to less than 0.12% by mass, add lauric acid Ammonium 30g, after centrifugation and concentration, ammonium supplemented to 0.07% (mass percentage), and finally 6g of EDTA was added to the concentrated milk to inhibit enzyme activity and preserved. Obtain 17.6 kg of low-protein natural concentrated latex with a nitrogen content of 0.09%.

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Abstract

The invention relates to a production method of low-protein concentrated natural latex. The production method is characterized in that lauric acid ammonium is added into fresh latex for carrying out stable treatment, the stirring is carried out for 0.5 to 1 hour, rubber vulcanization accelerators with the mass percent being 0.03 percent and zinc oxide are added into the latex, under the condition with the temperature being 20 to 40 DEG C, 0.05 to 0.4 g of low-temperature alkali protease is added per kilogram of fresh latex, and the low-speed stirring lasts 15 to 24 hours; and when the nitrogen content of the latex to be concentrated is lower than 0.12 mass percent, the lauric acid ammonium is added in a supplementary way after centrifugal concentration, in addition, the ammonium complementing treatment is carried out, finally, EDTA (ethylene diamine tetraacetic acid) is added in the concentrated latex in time for inhibiting enzyme activity, and the materials are stored.

Description

technical field [0001] The invention belongs to a production method of low-protein concentrated natural rubber latex, and in particular relates to the stage-by-stage stabilization treatment of natural latex, the use of protease to decompose the protein in natural rubber particles, the removal of protein in natural latex and the enzyme activity inhibition technology. Background technique [0002] The demand for latex products at home and abroad is increasing at a rate of 5% to 10% every year, and its market capacity will become larger and larger. However, since natural rubber contains a considerable amount of protein, it increases the hygroscopicity, electrical conductivity and heat generation of natural rubber products, especially causing allergies in contact with natural rubber products, thus limiting natural rubber products with high protein content Application in medical, health care and electrical insulation products. Therefore, research on low-protein rubber can reduce...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08C1/04C08L7/02C08K13/02C08K3/22C08K5/09
Inventor 李灿鹏赵卉和智坤欧灵澄
Owner YUNNAN UNIV
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