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Natural rubber disassembling method

A natural rubber and solution technology, applied in the field of natural rubber, can solve the problems of high lipid residue, complicated disassembly methods, and difficult removal of surfactants

Active Publication Date: 2020-01-31
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

[0003] In the prior art, natural latex (fresh latex or concentrated latex) is usually dismantled by deproteinization and lipid-binding methods, wherein deproteinization generally includes enzymatic hydrolysis, urea treatment and centrifugation, and enzymatic hydrolysis requires the addition of a large amount of surface Active agent, but the removal of surfactant is difficult, urea treatment method will have the problem of urea residue, and centrifugation method cannot completely remove protein; delipidization is generally carried out with sodium hydroxide for transesterification, and then sequentially extracted with ethanol and acetone, However, the residual amount of lipid is high, the extraction operation is complicated, and the reagent is highly toxic
It can be seen that the dismantling method of the prior art is more complicated

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0049] Weigh 10mg of natural rubber and cut into about 1mm 3 Add 10mL of 2,6-di-tert-butyl-4-methylphenol toluene solution, wherein the concentration of 2,6-di-tert-butyl-4-methylphenol is 50ppm, under dark conditions , dissolved for 5 days, and shaken for 1 hour every day at a rotating speed of 50 rpm to obtain a natural rubber solution;

[0050] Vacuumize the air in the device, then pass in argon, add 60 mg of a methanol solution of sodium methoxide with a concentration of 25 wt.% to the natural rubber solution, and react at 70 ° C for 6 hours in the dark, and the reaction solution After naturally cooling to room temperature, neutralize the solution with ether solution of hydrogen chloride, rotate the neutralized solution to a volume of 10 mL, then add 100 mL of methanol, refrigerate the resulting mixture at 2°C for 24 hours, and then use tweezers to remove all The solid was placed in a vacuum drying oven at room temperature and dried to constant weight to obtain 9.933 mg o...

Embodiment 2

[0052] Weigh 60mg of natural rubber and cut into about 1mm 3 Add 10mL of 2,6-di-tert-butyl-4-methylphenol toluene solution, wherein the concentration of 2,6-di-tert-butyl-4-methylphenol is 200ppm, under dark conditions Dissolve for 7 days, and shake for 1 hour every day at a rotating speed of 300rpm to obtain a natural rubber solution;

[0053] Vacuumize the air in the device, and then pass in nitrogen, add 360 mg of methanol solution of sodium methoxide with a concentration of 30wt.% to the natural rubber solution, and react at 70 ° C for 4 hours in the dark, and the reaction solution is naturally After cooling to room temperature, the solution was neutralized with methanol solution of hydrogen chloride, and the neutralized solution was rotary evaporated to a volume of 20 mL, then 160 mL of methanol was added, and the resulting mixture was refrigerated at 8°C for 16 h, and then all the solids were removed using tweezers. The solid was placed in a vacuum drying oven at room t...

Embodiment 3

[0055] Weigh 100mg of natural rubber and cut into about 1mm 3 Add 10mL of 2,6-di-tert-butyl-4-methylphenol toluene solution, wherein the concentration of 2,6-di-tert-butyl-4-methylphenol is 250ppm, under dark conditions Dissolve for 7 days, and shake for 0.5h every day at a speed of 200rpm to obtain a natural rubber solution;

[0056] Vacuumize the air in the device, and then pass in nitrogen, add 400 mg of methanol solution of sodium methoxide with a concentration of 50wt.% to the natural rubber solution, and react at 85 ° C for 2 hours in the dark, and the reaction solution is naturally After cooling to room temperature, use hydrochloric acid solution to neutralize the solution, rotate the neutralized solution to a volume of 25 mL, then add 125 mL of methanol, refrigerate the resulting mixture at 10°C for 24 hours, and then use tweezers to remove all solids , placed in a vacuum oven at room temperature and dried to constant weight to obtain 99.87 mg of disassembled product ...

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Abstract

The invention provides a natural rubber disassembling method, and belongs to the technical field of natural rubber. The disassembling method provided by the invention comprises the following steps: dissolving natural rubber in an organic solvent to obtain a natural rubber solution; and mixing the natural rubber solution with sodium methoxide in a protective atmosphere in a dark place, carrying outa reflux reaction, neutralizing the reaction solution obtained by the reflux reaction, mixing the neutralized reaction solution with methanol, and refrigerating to complete disassembly. According tothe preparation method, in the reflux reaction process, the sodium methoxide and terminal group-lipoid at one end of a natural rubber molecular chain are subjected to transesterification, so that a lipoid connecting point for generating molecular crosslinking is broken; by neutralizing the reaction solution obtained by the reflux reaction, mixing with the methanol, a hydrogen bond formed by a natural rubber molecular chain and protein by the methanol can be broken so as to obtain linear molecules.

Description

technical field [0001] The invention relates to the technical field of natural rubber, in particular to a method for dismantling natural rubber. Background technique [0002] Natural rubber is a polyisoprene polymerized from monomeric isoprene in the rubber tree. Its inherent molecules are linear. Influenced by the interaction of hydrogen bonds or chemical bonds, the molecular chains of polyisoprene in natural rubber are branched and cross-linked during biosynthesis, processing and storage, forming a physical network structure. On the one hand, this physical network structure Rubber gel is formed, and the insoluble gel in the sample is filtered out when adopting gel permeation chromatography to measure the molecular weight of natural rubber, so that the test result cannot reflect the true molecular weight of natural rubber; on the other hand, the rubber molecules are branched , and gradually increased during processing and storage, resulting in dynamic changes in the shape ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08C19/08
CPCC08C19/08
Inventor 张福全廖禄生王兵兵孙中锐李高荣汪月琼林宏图邓东华彭政
Owner AGRI PRODS PROCESSING RES INST CHINESE ACAD OF TROPICAL AGRI SCI
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