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Low content nitrile cross-linked powdery acrylonitrile butadiene preparation method

A technology of powder nitrile-butadiene rubber and a production method, which is applied in the production field of cross-linked powder nitrile-butadiene rubber with low nitrile content, can solve problems such as immature polymerization method, and achieve stable performance indicators, good isolation effect and high drying efficiency. Effect

Active Publication Date: 2006-11-22
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Abstract
  • Description
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  • Low content nitrile cross-linked powdery acrylonitrile butadiene preparation method

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Experimental program
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Effect test

Embodiment 1

[0039] A: Preparation of nitrile mortar: firstly, vacuumize the polymerization kettle, put in 180 parts of soft water, 5 parts of fatty acid potassium-potassium oleate compound emulsifier in a ratio of 1:0.5, 0.6 parts of diffusing agent NF, tert-dodecylsulfur 0.5 parts of alcohol, 28 parts of acrylonitrile, 0.4 parts of initiator (potassium persulfate), stop vacuuming, add 72 parts of butadiene; heat up to 29±1°C, when the conversion rate reaches 60%, heat up to 47±1 ℃, when the conversion rate reaches above 95%, add 0.2 parts of sodium formam to terminate the reaction, and send the glue into the degasser for flashing to remove unreacted butadiene and acrylonitrile. The flashing degassing conditions are: temperature 60~ 70℃, vacuum degree -0.04~-0.06MPa, degassing time 2~3hr.

[0040] The indicators of the obtained glue are as follows:

[0041] Solid content: 35.6%; PH value: 10.7 Structural gel content: 78%;

[0042] Mooney viscosity : 125; bound acrylonitrile: 26.2%

...

Embodiment 2

[0049] When adjusting the composite consumption of potassium fatty acid-potassium oleate in the nitrile mortar preparation process in embodiment 1 to 6 parts, without diffusing agent NF, acrylonitrile is adjusted to 35 parts by 28 parts, initiator (potassium persulfate) Adjust 0.3 part by 0.4 part, add butadiene and adjust to 65 parts by 72 parts, other process formula is the same as embodiment 1, and gained product index is still in the control range shown in table 2. Its indicators are as follows:

[0050] Solid content: 35.4%; PH value: 10.6 Structural gel content: 82%;

[0051] Mooney viscosity : 130; bound acrylonitrile: 32.7%

Embodiment 3

[0053] The consumption of the butadiene in the butadiene mortar preparation process in the embodiment 1 is transferred to 70 parts by 72 parts, and acrylonitrile is transferred to 30 parts by 28 parts, and initiator potassium persulfate is changed into hydrogen peroxide Dicumyl-ferrous sulfate was used as an initiator to react at a temperature of 5-8° C., and the other technological formulas were the same as in Example 1, and the index of the obtained product was still within the control range shown in Table 2. Its indicators are as follows:

[0054] Solid content: 35.9%; PH value: 10.6 Structural gel content: 76%; Mooney viscosity : 110; bound acrylonitrile: 26.2%

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Abstract

The invention discloses a manufacturing method of cross linking powder butadiene acrylonitrile rubber with low acrylonitrile content, which is characterized by the following: adopting aliphatic potassium or sodium and potassium or sodium oleate as compound emulsifier to produce butadiene acrylonitrile rubber slurry through polymerization emulsion with 20-20 percent combination acrylic nitrile content; using 8-10 pH value saturated NaCl solution as coagulant, polymer resin emulsion-inorganic separant (lightweight CaCO3)-organic separant(potassium oleate)as composite separant to proceed agglomeration separation powdered reaction for butadiene acrylonitrile rubber slurry at 30-65 deg.c. The invention is easy to operate to produce stable index product, which satisfies the appliance need of resin and abrasion material.

Description

technical field [0001] The invention relates to a production method of powdered nitrile rubber, in particular to a production method of low nitrile content cross-linked powdered nitrile rubber Background technique [0002] Powdered nitrile rubber not only has advantages in processing, but also is widely used in the modification of plastics, resins and friction materials. In terms of resin modification, it can greatly improve the oil resistance, wear resistance, impact strength and other properties of products. [0003] At present, the production methods of powdered nitrile rubber mainly contain two categories: the first type is the mechanical pulverization method and the low-temperature mechanical pulverization method using block nitrile rubber as raw material. This method consumes a lot of energy and has coarse particles, so it is mostly used for recycling waste and old rubber. The second category is four kinds of drying method, co-coagulation method, polymerization metho...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F236/12C08F6/22C08J3/16
Inventor 席永盛李红春任彩霞李小玲
Owner BC P INC CHINA NAT PETROLEUM CORP
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