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Anti-aging high-strength natural rubber and preparation method thereof

A natural rubber and high-strength technology, applied in the field of rubber, can solve the problems of natural rubber physical and mechanical properties, poor aging resistance, difficulty in meeting the requirements of high-end products, and affecting the safe supply of national strategic materials, so as to slow down the solidification rate, Effect of prolonging storage time and improving tensile strength

Active Publication Date: 2022-01-14
RUBBER RES INST CHINESE ACADEMY OF TROPICAL AGRI SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, formic acid is mostly used to coagulate fresh latex in production, and the coagulation rate is fast, but the physical and mechanical properties and aging resistance of the prepared natural rubber are poor, and it is difficult to meet the rubber requirements of high-end products, resulting in the long-term dependence of domestic high-end products on imports, which is seriously Affected the safe supply of national strategic materials

Method used

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  • Anti-aging high-strength natural rubber and preparation method thereof
  • Anti-aging high-strength natural rubber and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0034] The present embodiment provides a kind of preparation method of aging-resistant high-strength natural rubber, which comprises:

[0035] Adding 15g concentration in 3000g fresh latex is 10wt% ammoniacal liquor, adding 24g concentration is 10wt% hydrogen peroxide, adding 30g concentration is the compound solution of 10wt% trisodium phosphate and dipotassium hydrogen phosphate (trisodium phosphate: dihydrogen phosphate The ratio of potassium is 1: 1), after described latex is processed by centrifuge settler, then add 300g concentration and be the compound solution of 0.1wt% cellulose and nano silicon dioxide (the ratio of cellulose: nano silicon dioxide is 1:1), fresh latex and compound solution were mixed and stirred for 1 hour, then 240g of microbial coagulation solution (yeast: molasses: water ratio of 1:5:100) was added to coagulate, and the curd was matured for 3 days after the coagulation was complete, and then Crepe, wash with water, dry at 160°C for 5 minutes, and ...

Embodiment 2

[0037] Adding 18g concentration is 10wt% ammoniacal liquor at 3000g fresh latex, adding 24g concentration is 10wt% hydrogen peroxide, adding 30g concentration is the compound solution of 10wt% aminoacetic acid and alanine (aminoacetic acid: the ratio of alanine is 1 : 1), after the latex is processed by a centrifugal sedimentation machine, adding 120g concentration is a compound solution of 0.2% cellulose and starch (the ratio of cellulose: starch is 1:1), fresh latex and compound After the solution is mixed and stirred for 2 hours, add 300g of microbial coagulation solution (yeast: molasses: water ratio is 1:5:100) to solidify. After the solidification is complete, the curd is matured for 5 days, then crepeed, washed with water, and dried at 155°C for 10 minutes. Then dry at 80°C to obtain natural rubber samples.

Embodiment 3

[0039] Adding 18g concentration is 10wt% ammoniacal liquor at 3000g fresh latex, adding 15g concentration is 10wt% hydrogen peroxide, adding 24g concentration is the compound solution of 10wt% trisodium phosphate and dipotassium hydrogen phosphate (trisodium phosphate: dipotassium hydrogen phosphate The ratio of cardanol and cashew nut shell oil is 1:1), and after the latex is processed by a centrifugal sedimentation machine, 10 g of a compound solution of 0.3% cardanol and cashew nut shell oil is added (the ratio of cardanol: cashew nut shell oil is 3:1) After mixing the fresh latex and the compound solution and stirring for 3 hours, add 240g of microbial coagulation liquid (yeast: molasses: water ratio of 1:5:100) to solidify. Wash with water, dry at 155°C for 5 minutes, and then dry at 70°C to obtain natural rubber samples.

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Abstract

The invention discloses a preparation method of anti-aging high-strength natural rubber. The preparation method comprises the steps of (1) obtaining natural latex; (2) adding ammonia water and hydrogen peroxide; (3) adding soluble phosphate or amino acid; (4) conducting centrifugal sedimentation; (5) mixing with a reinforcing agent to obtain a mixed solution; (6) solidifying the mixed solution to obtain a gel block; (7) curing the gel block; (8) pressing the cured gel block into creases, washing with water, firstly drying at 150-170 DEG C for 5-15 minutes, and then drying at 70-90 DEG C to obtain a natural rubber finished product, wherein the soluble phosphate is selected from trisodium phosphate and / or dipotassium phosphate; and amino acid is selected from glycine and / or alanine. The natural rubber prepared by the invention is good in aging resistance, and the tensile strength and tearing strength of vulcanized rubber are high.

Description

technical field [0001] The invention relates to the field of rubber, in particular to an aging-resistant high-strength natural rubber and a preparation method thereof. Background technique [0002] Natural raw rubber is the key raw material for making rubber products, and generally refers to unvulcanized natural rubber. Natural raw rubber is made by coagulating fresh latex. In addition to rubber hydrocarbons and water, fresh latex still contains about 5% of non-rubber substances. The content of non-rubber substances is not much, but it has a significant impact on the properties of natural rubber. The coagulation process of natural latex generally includes acid coagulation, natural coagulation, microbial coagulation and salt coagulation. At present, formic acid is mostly used to coagulate fresh latex in production, and the coagulation rate is fast, but the physical and mechanical properties and aging resistance of the prepared natural rubber are poor, and it is difficult to...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L7/00C08L1/02C08L3/02C08L91/00C08K3/36C08K5/13C08C1/02C08C1/15
CPCC08L7/00C08C1/02C08C1/15C08K2201/011C08L1/02C08K3/36C08L3/02C08L91/00C08K5/13Y02T10/86
Inventor 李建伟桂红星黄红海丁丽戴拓赵立广宋亚忠王岳坤赵涛邓大雨
Owner RUBBER RES INST CHINESE ACADEMY OF TROPICAL AGRI SCI
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