Production method for micro-crosslinking type powdered acrylonitrile-butadiene rubber containing middle and high content of nitrile

A technology of powdered nitrile rubber and its production method, which is applied in the field of production of medium nitrile micro-crosslinked powdered nitrile rubber, can solve the problems of not being able to meet the high requirements of high temperature resistant train brake shoes, and cannot guarantee the high temperature resistance of products, and achieve improvement The effect of processing stability, improving elasticity, and simple production process

Inactive Publication Date: 2013-02-27
HUANGSHAN HUALAN TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Traditional powdered nitrile rubber antiaging agents are generally 1076 and 2246, and the resulting products can be used for a long time in an air medium below 120°C. For example, Lanzhou Chemical Co., Ltd. uses 1076 as an antiaging agent for powdered nitrile rubber. The agent cannot guarantee that the product can effectively withstand high temperature, and cannot meet the high requirements of high temperature resistant train brake shoes

Method used

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  • Production method for micro-crosslinking type powdered acrylonitrile-butadiene rubber containing middle and high content of nitrile

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] (1) Synthesis of nitrile mucilage:

[0032] First, the polymerization kettle was evacuated, and 205 parts of soft water, 3 parts of potassium oleate, 1 part of sodium methylene di-naphthalene sulfonate as a diffusing agent, 0.2 parts of buffering agent sodium carbonate, and 0.55 parts of molecular weight regulator tert-dodecanethiol part, 0.5 part of trimethylolpropane trimethacrylate, after stirring for 10 minutes, add 29 parts of acrylonitrile, 0.2 part of initiator potassium persulfate, 0.04 part of oxygen scavenger, vacuumize with nitrogen and repeat three times, add butadiene 70.5 parts, 0.12 parts of active phase, under the reaction temperature of 25-35°C and the reaction pressure of 0.2-0.52Mpa, the reaction time is 17-20 hours, when the conversion rate reaches 60%, add the molecular weight regulator tertiary 0.55 parts of carbon mercaptan, when the conversion rate reaches 80%, add 0.40 parts of molecular weight regulator tertiary dodecyl mercaptan; when the conv...

Embodiment 2

[0041] In the synthesis step of the nitrile mortar in Example 1, add 210 parts of soft water, 3 parts of emulsifier potassium oleate, 28 parts of acrylonitrile, 71.5 parts of butadiene, 0.5 part of trimethylolpropane trimethacrylate, Other process formulas are the same as in Example 1.

[0042] The performance index of gained nitrile mortar is: PH value 10.6, Mooney viscosity (ML 1+4 100℃ ) 50, the total solids concentration is 30.8%, the gel content is 15%, and the combined acrylonitrile content is 26.5%.

[0043] After isolation into powder and dehydration and drying, the resulting product index is within the control range shown in Table 2.

Embodiment 3

[0045] In the synthesis step of nitrile mortar in Example 1, add 0.3 parts of composite terminator (a mixed solution of diethylhydroxylamine, hydroxylamine sulfate, potassium hydroxide and soft water, the mass ratio of which is 3:2:2:70) , other process formulas are with embodiment 1.

[0046] The performance index of gained nitrile mortar is: pH value 10.2, Mooney viscosity (ML 1+4 100℃ ) 54, the total solids concentration is 30.7%, the gel content is 17%, and the combined acrylonitrile content is 27.1%.

[0047] After isolation into powder and dehydration and drying, the resulting product index is within the control range shown in Table 2.

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Abstract

The invention relates to a production method for micro-crosslinking type powdered acrylonitrile-butadiene rubber containing middle and high content of nitrile. Firstly, nitrile rubber paste is synthetized, then agglomerated and isolated into powder, and finally dehydrated and dried. In the polymerization reaction stage, potassium carbonate is added as a reaction buffer agent, and diethylhydroxylamine, hydroxylamine sulfate, a mixed solution of potassium hydroxide and soft water are added as a composite terminating agent. In the isolation and powdering stage, WSL and DLTP are added as an antiager, monovalent sodium salts and divalent magnesium salts or monovalent sodium salts and divalent calcium salts are used as a coagulant, and the nitrile rubber paste is agglomerated and isolated into powder at 30-75 DEG C. The production process of the present invention is simple, easy to operate, low in production costs, small in energy consumption, and high in conversion rate which can reach more than 95%. The production method employs a new composite terminating agent, which is stable in mooney and good in termination effect. The powdered acrylonitrile-butadiene rubber is relatively fine, therefore dispersibility is improved during processing. The product is very good in heat resistance and wear resistance, and can meet the application requirements of train high friction brake block.

Description

technical field [0001] The invention relates to a production method of powdered nitrile rubber, in particular to a production method of medium nitrile micro-crosslinked powdered nitrile rubber. Background technique [0002] Powdered nitrile rubber is a highly polar acrylonitrile-butadiene copolymer. Powdered nitrile rubber has good processing properties and can be used for thermoplastic materials. It can be divided into two types: cross-linked and non-cross-linked. Cross-linked powdered nitrile rubber is mainly used in the manufacture of wear-resistant materials such as train synthetic brake shoes, automobile brake pads and grinding wheels. It is also used to prepare adhesives. Compared with bulk rubber, powdered nitrile rubber has a finer powder particle size. When blended with other resins, it can be directly fed into the extruder, which is conducive to the realization of continuous and automatic processing. Therefore, it has the advantages of convenient operation and en...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L9/02C08F236/12C08F2/38C08C1/14
Inventor 储银亮胡斌张典吴忠影凌治水章卫东许旭东吕飚
Owner HUANGSHAN HUALAN TECH
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