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Method for producing cross-linking powder nitrile-butadiene rubber with medium and high nitrile content

A powdered nitrile rubber and a production method technology, which is applied in the production field of medium and high nitrile content cross-linked powdered nitrile rubber, can solve the problems that cannot meet the high requirements of high temperature resistant train brake shoes, cannot guarantee the high temperature resistance of products, and achieve improved Processing stability, good termination effect, and the effect of improving dispersibility

Inactive Publication Date: 2012-03-28
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, but with this antiaging 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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  • Method for producing cross-linking powder nitrile-butadiene rubber with medium and high nitrile content
  • Method for producing cross-linking powder nitrile-butadiene rubber with medium and high nitrile content
  • Method for producing cross-linking powder nitrile-butadiene rubber with medium and high nitrile content

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] (1) Synthesis of nitrile mucilage:

[0031] First, the polymerization kettle is evacuated, and 140 parts of soft water are dropped into successively, 6 parts of composite emulsifiers composed of potassium stearate-potassium oleate, wherein the mass ratio of potassium stearate and potassium oleate is 2: 1, and the diffusing agent sub 1 part of sodium methanesulfonate, 0.2 part of buffer potassium carbonate, 0.4 part of molecular weight modifier tertiary dodecyl mercaptan, after stirring for 10 minutes, add 31 parts of acrylonitrile, 0.1 part of initiator potassium persulfate, pump with nitrogen Vacuum is repeated three times, 69 parts of butadiene is added, and the reaction time is 17-20 hours at a reaction temperature of 29-63°C and a reaction pressure of 0.2-0.52Mpa. The reaction is divided into three stages: the first stage, the temperature is raised to 38-39°C, and the reaction is started; the second stage, when the conversion rate reaches 68%, the temperature is rai...

Embodiment 2

[0040] In the synthesis step of nitrile mortar in embodiment 1, add 180 parts of soft water, 4 parts of composite emulsifier potassium stearate-potassium oleate, 35 parts of acrylonitrile, 65 parts of butadiene, other process formulas are the same as in Example 1.

[0041] The performance index of gained nitrile mortar is: pH value 10.6, Mooney viscosity (ML 1+4 100℃ ) 172, the total solid concentration is 32.8%, the gel content is 89%, and the combined acrylonitrile content is 32.6%.

[0042] After isolation into powder and dehydration and drying, the resulting product index is within the control range shown in Table 2.

Embodiment 3

[0044] In the synthesis step of nitrile glue in embodiment 1, add 0.1 part of composite terminator (the mixed solution of diethylhydroxylamine, hydroxylammonium sulfate, potassium hydroxide and soft water, its mass ratio is 3: 2: 2: 70) , other process formulas are with embodiment 1.

[0045] The performance index of gained nitrile mortar is: pH value 10.2, Mooney viscosity (ML 1+4 100℃ ) 170, the total solid concentration is 31.9%, the gel content is 87%, and the combined acrylonitrile content is 33.5%.

[0046] 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 method for producing cross-linking powder nitrile-butadiene rubber with medium and high nitrile content; the method comprises the steps of synthesizing nitrile-butadiene rubber slurry, then flocculating the nitrile-butadiene rubber slurry followed by separating and powdering, and dehydrating and drying. In the stage of polymerization reaction, potassium carbonate is added to be a buffering agent of the reaction, and the mixed liquor of diethylhydroxylamine, hydroxylamine sulphate, potassium hydroxide and soft water is used as a composite terminator; in the stage of separating and powdering, WSL and DLTP are added to be an antiager, and univalent sodium salt and bivalent magnesium salt or univalent sodium salt or bivalent calcium salt are taken as a flocculant for carrying out flocculating, separating and powdering on the nitrile-butadiene rubber slurry at 30-75 DEG C. The invention is simple in production technique, easy for operation, low in production cost, less in energy consumption and high in conversion rate which can be more than 95%; a novel composite terminator is adopted, so that mooney is stable and termination effect is good; the rubber powderis finer, and dispersity during processing is improved; and the heat-resistant quality of the product is very good, the wear resistance is good, and the invention can satisfy the requirement on application in high friction composite brake shoes of trains.

Description

technical field [0001] The invention relates to a production method of powdered nitrile rubber, in particular to a production method of medium-high nitrile content cross-linked 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 operatio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F236/12C08F2/42C08J3/16
Inventor 吕飚许旭东徐丽华凌治水潘小明竺亮储银亮陈晴章卫东吴忠影胡斌斌
Owner HUANGSHAN HUALAN TECH
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