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Modified processing method of natural rubber

A technology of natural rubber and treatment method, applied in the field of modification treatment of natural rubber, can solve the problems of slow modification reaction rate, easy occurrence of side reactions, poor compatibility of natural rubber, etc. Good thermal stability and chemical inertness, and the effect of enhancing the interface effect

Inactive Publication Date: 2018-12-18
HEFEI XINYADA INTELLIGENT TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, the modification effect of the conventional natural rubber modification treatment method is poor, the rate of the modification reaction is slow, the success rate of grafting is low, and side reactions are prone to occur, the reaction process is uniform and insufficient, and the functionality of the natural rubber surface The amount of grafted groups is low, which makes the compatibility of other natural rubber components less

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  • Modified processing method of natural rubber
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Embodiment 1

[0036] A modification treatment method of natural rubber, comprising the steps of:

[0037] (1) According to the mass parts, 200 parts of purified latex, 7.2 parts of 10wt% polyoxyethylene lauryl ether sodium sulfate aqueous solution, 15 parts of 30wt% sodium hydroxide solution and 100 parts of deionized water are added to the reactor , continuously stirred at a speed of 120r / min, and saponified at a temperature of 30°C for 18h;

[0038] (2) In the product in the reaction kettle of the upward step, add 20wt% hydrochloric acid solution for neutralization, then add acrylic acid and glutamic acid and other mixed acids in molar ratio to adjust the pH of the mixture to 5;

[0039] (3) Add 5 parts of 2-mercaptoethanol, 6 parts of vinyl acetate and 9 parts of vinylcyclopropane into the reactor, adjust the temperature of the reactor to 65°C, and stir at a speed of 200r / min for 10min; Add 8 parts of catalytic suspending agent into the kettle, and continue to stir at the same speed for...

Embodiment 2

[0047] A modification treatment method of natural rubber, comprising the steps of:

[0048] (1) According to the number of parts by mass, 200 parts of purified latex, 7.2 parts of 10wt% polyoxyethylene lauryl ether sodium sulfate aqueous solution, 15 parts of 30wt% sodium hydroxide solution and 100 parts of deionized water are added to the reactor , continuously stirred at a speed of 150r / min, and saponified at a temperature of 35°C for 24h;

[0049] (2) In the product in the upward step reactor, add 20wt% hydrochloric acid solution for neutralization, then add methacrylic acid and glutamic acid and other mixed acids in molar ratio to adjust the pH of the mixture to 5.2;

[0050] (3) Add 5 parts of 2-mercaptoethanol, 6 parts of vinyl acetate and 9 parts of vinylcyclopropane into the reactor, adjust the temperature of the reactor to 80°C, and stir at a speed of 250r / min for 13min; Add 8 parts of catalytic suspending agent into the kettle, and continue to stir at the same speed...

Embodiment 3

[0058] A modification treatment method of natural rubber, comprising the steps of:

[0059] (1) According to the number of parts by mass, 200 parts of purified latex, 7.2 parts of 10wt% polyoxyethylene lauryl ether sodium sulfate aqueous solution, 15 parts of 30wt% sodium hydroxide solution and 100 parts of deionized water are added to the reactor , continuously stirred at a speed of 140r / min, and saponified at a temperature of 33°C for 22h;

[0060] (2) In the product in the reaction kettle of the upward step, add 20wt% hydrochloric acid solution for neutralization, then add styrene acid and glutamic acid and other mixed acids in molar ratio to adjust the pH of the mixture to 5.1;

[0061] (3) Add 5 parts of 2-mercaptoethanol, 6 parts of vinyl acetate and 9 parts of vinylcyclopropane into the reactor, adjust the temperature of the reactor to 70°C, and stir for 12min at a speed of 230r / min; Add 8 parts of catalytic suspending agent into the kettle, and continue to stir at the...

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Abstract

The invention relates to the technical field of rubber materials, and in particular, relates to a modified processing method of natural rubber. The method includes the steps of saponification reactionof purified latex, acidification treatment, catalytic grafting, microwave irradiation copolymerization reaction and the like. In the treatment method, through reaction with 2-mercaptoethanol, vinyl acetate and a vinyl cyclopropane compound, polar and nonpolar groups are grafted on natural rubber molecules, and the compatibility and the interface effect of natural rubber and rubber materials as well as functional auxiliary agents are improved. A catalytic suspension agent used in the catalytic graft copolymerization reaction contains aromatic polyethylene glycol ether, polyacrylamide, metal quantum dots, diphenylphosphine, methyl azodiisobutyrate, bislauroyl peroxide and deionized water. The method can improve the chemical reaction rate of surface modification treatment of natural rubber and the grafting efficiency of the functional groups.

Description

technical field [0001] The invention relates to the technical field of rubber materials, in particular to a method for modifying natural rubber. Background technique [0002] Natural rubber is a kind of natural rubber latex collected from rubber trees. The elastic solid made of latex through coagulation, drying and other processing processes is natural rubber. Natural rubber is a natural polymer compound with cis-1,4-polyisoprene as the main component. The content of cis-1,4-polyisoprene in rubber is as high as 91-94%, and it also contains a small amount of protein , fatty acids, ash, sugar and other non-rubber substances. [0003] Natural rubber has high elasticity at room temperature, slightly plastic, has very good mechanical strength, low hysteresis loss, and low heat generation during multiple deformations, so its flex resistance is also very good, and because it is non-polar Rubber, so the electrical insulation performance is good. Because of these performance chara...

Claims

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Application Information

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IPC IPC(8): C08C19/20C08C19/28
CPCC08C19/20C08C19/28
Inventor 张玉
Owner HEFEI XINYADA INTELLIGENT TECH CO LTD
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