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A kind of natural latex stabilizer and its application

A natural rubber latex and stabilizer technology, applied in the field of natural rubber latex stabilizers, can solve the problems of environmental pollution, strong irritation, and easy volatilization of ammonia water, and achieve the effects of improving stability, ensuring convenience, and improving mechanical stability

Active Publication Date: 2022-05-03
AGRI PRODS PROCESSING RES INST CHINESE ACAD OF TROPICAL AGRI SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, ammonia water has the disadvantages of being volatile, highly irritating, and polluting the environment, which has adverse effects on the production environment, downstream product production process control, and wastewater treatment. The research and development of a new low-ammonia storage system for natural latex has become a current research focus. It is also an inevitable trend of technological innovation and development in the latex industry

Method used

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  • A kind of natural latex stabilizer and its application
  • A kind of natural latex stabilizer and its application
  • A kind of natural latex stabilizer and its application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] (a) Weighing 10 parts of lipase and adding it to 90 parts of 0.1mol / L phosphate buffer (pH=7.2), stirring and grinding to obtain a uniformly dispersed lipase suspension, ready for use;

[0041] (b) Weigh 20 parts of water-soluble phospholipids, dissolve in 100 parts of ammonia water with a mass fraction of 25%, stir at room temperature for 4 hours, and prepare a uniform emulsion for use;

[0042] (c) get the concentrated natural rubber latex that is 60% of the total solid mass fraction collected at the outlet of the high-speed centrifuge after centrifugal concentration processing, and measure the mass fraction of its ammoniacal liquor to be 0.18%, and the mechanical stability is 40s.

[0043] Get 10000 parts of concentrated natural rubber latex, add 4.5 parts of ammonium laurate, the lipase suspension described in step (a) successively under stirring, add the phospholipid emulsion described in step (b) after stirring 1h, stir and mix, Mix well for 1 hour and start the f...

Embodiment 2

[0045] (a) Weigh 20 parts of lipase and add it to 100 parts of 0.1mol / L phosphate buffer (pH=7.0), stir and grind to obtain a lipase suspension with a mass fraction of 16.7%, which is ready for use;

[0046] (b) Weigh 30 parts of water-soluble phospholipids, dissolve in 170 parts of ammonia water with a mass fraction of 25%, stir at room temperature for 4 hours, and prepare a uniform emulsified solution for use;

[0047] (c) get the concentrated natural rubber latex that is 60% of the total solid mass fraction collected at the outlet of the high-speed centrifuge after centrifugal concentration processing, and measure the mass fraction of its ammoniacal liquor to be 0.18%, and the mechanical stability is 40s.

[0048] Get 10000 parts of concentrated natural rubber latex, add 40 parts of ammonium laurate, the lipase suspension described in step (a) successively under stirring, add the phospholipid emulsion described in step (b) after stirring 1h, stir and mix, Mix well for 1 hou...

Embodiment 3

[0050] (a) 40 parts of lipase were weighed and added to 160 parts of 0.1mol / L phosphate buffer (pH=7.6), stirred and ground to obtain a lipase suspension with a mass fraction of 20%, which was then used;

[0051] (b) Weigh 50 parts of water-soluble phospholipids, dissolve in 200 parts of ammonia water with a mass fraction of 25%, stir at room temperature for 4 hours, and prepare a uniform emulsion for use;

[0052] (c) get the concentrated natural rubber latex that is 60% of the total solid mass fraction collected at the outlet of the high-speed centrifuge after centrifugal concentration processing, and measure the mass fraction of its ammoniacal liquor to be 0.15%, and the mechanical stability is 38s.

[0053] Get 10000 parts of concentrated natural rubber latex, add 50 parts of ammonium laurate, the lipase suspension described in step (a) successively under stirring, add the phospholipid emulsion described in step (b) after stirring for 1.5h, stir and mix evenly , start the ...

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Abstract

The invention discloses a natural rubber latex stabilizer and a method for rapidly improving the mechanical stability of natural rubber latex under low-ammonia storage. Low-ammonia natural rubber latex, add 0.1-0.8 parts (dry weight) of water-soluble phospholipids and 0.1-0.6 parts (dry weight) of lipase, and stir evenly at room temperature. This method uses lipase to quickly hydrolyze phospholipids to increase the negative charge of latex particles and the thickness of the hydration film, which can quickly improve the mechanical stability of concentrated natural latex stored in low ammonia, and make the mechanical stability of concentrated natural latex reach the national standard within 30 days The specified minimum limit of 650 seconds and maintain good process operation performance. At the same time, the mass fraction of ammonia in the concentrated natural latex can be controlled below 0.2%, which is suitable for the development trend of low-ammonia preservation of natural latex.

Description

technical field [0001] The invention relates to the technical field of primary processing of natural rubber, in particular to a natural latex stabilizer and its application. Background technique [0002] Natural rubber latex is a natural polymer emulsion biosynthesized by the Brasilian Hevea tree. It is generally believed that non-rubber substances such as proteins and lipids in natural latex form a protective film around the rubber particles, making the rubber particles negatively charged, thereby forming a stable colloidal system. [0003] The mechanical stability time (MST) of latex is an important parameter to characterize the colloidal stability of concentrated natural rubber latex. This stability is critical for the use, transport and storage of concentrated natural rubber latex prior to forming latex products. In recent years, with the reform of my country's rubber mining system, the stability of domestic natural latex has shown a significant downward trend due to f...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08C1/00
CPCC08C1/00
Inventor 吕明哲李普旺李永振杨子明余和平刘运浩
Owner AGRI PRODS PROCESSING RES INST CHINESE ACAD OF TROPICAL AGRI SCI
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