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A kind of extremely high nitrile cross-linked powder nitrile rubber and preparation method thereof

A powdered nitrile rubber and cross-linking technology, which is applied in the field of powdered nitrile rubber, can solve the problems of being unable to produce powdered nitrile rubber with low nitrile and extremely high nitrile content

Active Publication Date: 2021-05-11
安庆华兰科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

According to the above-mentioned patent method, two different types of powdered nitrile rubbers of medium nitrile and medium-high nitrile can be produced, but through the above formula and process conditions, simply adjusting the addition ratio of butadiene and acrylonitrile cannot produce low nitrile and powdered nitrile rubber with very high nitrile content

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] (1) Synthetic nitrile latex: First, the polymerization kettle is evacuated, and 180 parts of deionized water, 2.5 parts of emulsifier sodium dodecylbenzenesulfonate, 0.5 part of electrolyte potassium carbonate, molecular weight regulator tertiary ten 0.5 part of dialkyl mercaptan, 45 parts of acrylonitrile, initiator (the composite of ammonium persulfate and diacid block, ferrous sulfate, tetrasodium EDTA, sodium ferric EDTA is 1:0.5:0.25:0.1:0.1 by weight substance) 0.3 parts, nitrogen filling and vacuuming repeated twice, add 25 parts of butadiene, start stirring, start to heat up to 15-25 ° C, when the polymerization conversion rate reaches 40-45%, start the first addition of butadiene 15 parts of diene, supplementary time of 0.5 hours; when the conversion rate of polymerization reaction reaches 60-65%, start to add 15 parts of butadiene for the second time, supplementary time of 0.5 hours; when the conversion rate of polymerization reaction reaches 80% , add 0.2 par...

Embodiment 2

[0027] In the step of synthesizing nitrile latex of embodiment 1, add 200 parts of deionized water, 50 parts of acrylonitrile, 20 parts of butadiene, 3.0 parts of emulsifier sodium lauryl sulfate, other technological formulas are the same as embodiment 1.

[0028] After coagulation into powder, centrifugal dehydration and drying, powdery nitrile rubber is obtained with a water content of 0.7%.

[0029] Sampling analysis, the index of gained powder acrylonitrile-butadiene rubber is: combined nitrile content is 45.2%, and gel content is 88%.

Embodiment 3

[0031] In the step of synthesizing nitrile latex in embodiment 1, add 40 parts of acrylonitrile, 30 parts of butadiene, 3.0 parts of emulsifier potassium oleate, other technological formulas are the same as embodiment 1.

[0032] After coagulation into powder, centrifugal dehydration and drying, powdered nitrile rubber is obtained with a water content of 0.6%.

[0033]Sampling analysis, the index of gained powder acrylonitrile-butadiene rubber is: combined nitrile content is 43.6%, and gel content is 89%.

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Abstract

The invention discloses a preparation method of a very high nitrile cross-linked powdered nitrile rubber, which comprises the following steps: first, using butadiene and acrylonitrile as monomers to synthesize nitrile latex through emulsion polymerization, and then making the nitrile latex Agglomerated into powder, centrifugal dehydration and drying to obtain extremely high nitrile cross-linked powdered nitrile rubber. A very high nitrile crosslinked powdered nitrile rubber prepared by this method is also disclosed. The invention has the advantages of: adopting a polymerization reaction process combining medium and high temperature; high polymerization conversion rate, no acrylonitrile and butadiene recovery device; complete monomer reaction, low cost; effectively improving product quality stability and oil resistance Better; effectively complete the cross-linking of molecular chains, and the product has better wear resistance and heat resistance.

Description

technical field [0001] The invention relates to the technical field of powdered nitrile rubber, in particular to a cross-linked powdered nitrile rubber with extremely high nitrile content and a preparation method thereof. Background technique [0002] Powdered nitrile rubber is a polymer rubber emulsion synthesized by emulsion polymerization of butadiene, acrylonitrile and additives, and then powdered rubber is obtained through coagulation, powdering and drying. [0003] Powdered nitrile rubber has the advantages of small particle size, good dispersion when blended with other resins, and can be directly processed by plastic molding technology, which is conducive to the realization of continuous and automatic processing. At present, powdered nitrile rubber can be divided into non-cross-linked type (gel content<1%), micro-cross-linked type (gel content 5-30%) and cross-linked type (gel content 75-95%) according to the type of cross-linking. %) three types, and their uses a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F220/44C08F236/12C08F2/00
CPCC08F2/00C08F220/44C08F236/12
Inventor 徐国亮许桂汪贵玉刘江张典韩晓峰张森吕飚
Owner 安庆华兰科技有限公司
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