Preparation method of powdered butyronitrile rubber

A technology of powdered nitrile rubber and nitrile rubber, which is applied in the field of powdered nitrile rubber preparation, can solve problems such as high cost, high cost, and difficult sewage treatment, and achieve the goal of increasing difficulty and cost, low cost, and strong cohesion ability Effect

Active Publication Date: 2014-01-08
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

However, the coagulation method needs to use a large amount of inorganic salt sodium chloride, resulting in high cost. In addition, the condensed wastewater contains a large amount of salt, which brings great difficulties to sewage treatment, and requires a high cost for sewage treatment.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] (1) Synthesis of nitrile latex

[0030] First, vacuumize the polymerization kettle, drop into 190 parts by weight of deionized water successively, 6 parts by weight of composite emulsifier, 0.3 parts by weight of electrolyte, 0.7 parts by weight of molecular weight regulator, add 36 parts by weight of acrylonitrile after stirring for 10 minutes, initiator persulfuric acid Potassium 0.15 parts by weight, filled with nitrogen and vacuumized three times, added 64 parts by weight of butadiene, started to heat up to 35-40°C, reacted for 4-6 hours, the conversion rate reached 50-60%, continued to heat up to 45-55°C , keep the reaction at this temperature for 4-6 hours, when the conversion rate reaches 80-90%, continue to heat up to 60-70°C, keep the temperature for 4-6 hours, when the conversion rate reaches 93-95% or more, Start to add 0.4 parts by weight of composite terminator to terminate the reaction, remove unreacted monomers from the synthesized latex in a degassing ke...

Embodiment 2

[0035] (1) Synthesis of nitrile latex

[0036] First, the polymerization kettle is evacuated, and 200 parts by weight of deionized water, 3 parts by weight of emulsifier, 0.2 parts by weight of electrolyte, 1.4 parts by weight of molecular weight modifier are successively dropped into, and after stirring for 10 minutes, 33 parts by weight of acrylonitrile and initiator potassium persulfate are added. 0.3 parts by weight; fill with nitrogen and vacuumize three times, add 67 parts by weight of butadiene, start to heat up to 25-35°C, react for 16-21 hours, when the conversion rate reaches above 93-95%, start to add compound terminator 0.4 parts by weight to terminate the reaction; the synthesized latex is degassed at a temperature of 70 ± 2° C. and a pressure of -0.06 MPa to remove unreacted monomers. The whole process takes 2 to 4 hours to obtain qualified Nitrile latex (slightly cross-linked nitrile latex);

[0037] Sampling analysis, the performance index of nitrile latex is:...

Embodiment 3

[0041] Add 100 parts by weight of cross-linked nitrile latex synthesized in Example 1 (based on the parts by weight of latex) in the coagulation kettle, 150 parts by weight of deionized water, 1.2 parts by weight of anti-aging agent (solution of concentration 15%), heat up to 45-55°C, first add 7 parts by weight of polymer flocculant with a concentration of 2%, and then add 1.5 parts by weight of magnesium sulfate (solution with a concentration of 5%), after the latex is fully coagulated, heat up to 75-85°C, add 1.5 parts by weight of composite release agent (solution with a concentration of 10%), keep warm for 1 hour, then, when cooled to below 40°C, discharge to obtain powdered nitrile rubber slurry; finally, the slurry can be centrifuged, washed and dried Get qualified products.

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PUM

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Abstract

The invention relates to a preparation method of powdered butyronitrile rubber. The preparation method comprises the following steps: polymerizing acrylonitrile, butadiene, an emulsifier, an electrolyte, mercaptan, an initiator, an activator and deionized water to obtain butyronitrile rubber latex; coagulating butyronitrile rubber latex, deionized water, an anti-aging agent, a polymeric flocculant, a coagulant and a separant to obtain powdered butyronitrile rubber slurry; centrifugally dewatering the powdered butyronitrile rubber slurry in a centrifugal machine until lowering the water content to be smaller than 40%; then feeding the wet slurry into a cyclone drying bed by a screw feeder, wherein the inlet temperature of a drying tower is 90-120 DEG C; and separating materials by a 16-mesh sieve and a 40-mesh sieve to obtain the powdered butyronitrile rubber with water content smaller than 1.0%. The method has the following advantages that (1) compared with inorganic salt, the polymeric flocculant is stronger in coagulation capability and lower in use amount; (2) the content of inorganic salt in waste water after coagulation is low, the waste water is simple to treat and the cost is low; (3) the worker labor intensity of salt preparation is lowered.

Description

technical field [0001] The invention relates to a method for preparing powdered rubber, in particular to a method for preparing powdered nitrile rubber. Background technique [0002] Nitrile rubber is a rubber material obtained by emulsion copolymerization of acrylonitrile and butadiene. It is mainly divided into liquid nitrile and solid nitrile rubber. Among them, solid nitrile rubber is divided into block and powder according to different uses. Due to the small particle size of powdered nitrile rubber, it has good dispersion when blended with other resins, and can be directly processed through plastic processing technology, which is conducive to realizing continuous and automatic processing. At present, nitrile rubber is mainly divided into low-temperature and medium-high-temperature synthesis methods. Among them, the nitrile rubber produced by the low-temperature method is non-crosslinked rubber, and the one produced by the medium-high temperature method is cross-linked ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L9/02C08F236/12C08C1/14
Inventor 徐国亮章卫东李显臣吴计付吴踪影许旭东张金宝
Owner 安庆华兰科技有限公司
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