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Emulsion polymerization method for preparing rapid vulcanization butadiene-acrylonitrile rubber

An emulsion polymerization method and a technology for preparing nitrile butadiene is applied in the field of preparing rapid vulcanization nitrile rubber by emulsion polymerization method, which can solve the problems of affecting the vulcanization strength and vulcanization effect, affecting the quality and service life of products, and cracking on the surface of products, etc. The effect of increased tensile stress, good physical and mechanical properties, and increased Mooney viscosity

Active Publication Date: 2013-12-18
PETROCHINA CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Since the gel will affect the vulcanization strength and vulcanization effect during the rubber processing process, it is easy to cause factors that affect the uniformity of the molecular structure of the rubber product. During the stress deformation process, the molecular chain will be broken, and the surface of the product will be cracked, seriously affecting Product quality and service life

Method used

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  • Emulsion polymerization method for preparing rapid vulcanization butadiene-acrylonitrile rubber
  • Emulsion polymerization method for preparing rapid vulcanization butadiene-acrylonitrile rubber
  • Emulsion polymerization method for preparing rapid vulcanization butadiene-acrylonitrile rubber

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0062] Add 5100 ml of water into a 10-liter reactor, then add 333.09 grams of CP-10 and 8.5 grams of CP-50, disperse and dissolve under stirring, add 477 grams of acrylonitrile, 1-tris(3-methacrylate) propane 13.8 grams, 4.1 grams of tert-dodecyl mercaptan, 0.1692 grams of sodium dithionite, nitrogen inflation-after vacuum replacement, add 1116 grams of butadiene, then add 0.4726 grams of cumene peroxide, control the temperature to 12 ° C to react, and transform When the conversion rate reaches 30~35%, add 105 grams of emulsifier CP-10, 3.15 grams of 1-tris(3-methacrylate) propane and 45 grams of acrylonitrile to continue the reaction. When the conversion rate reaches 60~70% After adding 105 grams of emulsifier CP-10, 11 grams of N, N'-m-phenylene bismaleimide and 95 grams of acrylonitrile mixed solution, continue the reaction. When the reaction conversion rate reaches more than 90%, add a terminator. After 30 minutes of degassing, then coagulation, drying, and glue sample tes...

Embodiment 2

[0066] at 3M 3 Add 1600 kilograms of water to the reaction kettle, then add 56.75 kilograms of potassium stearate solution and 53.89 kilograms of potassium oleate solution, 20 kilograms of potassium chloride solution, 14.28 kilograms of diffusing agent N solution, disperse and dissolve under stirring, and adjust agent D solution 61.6 kg, add 210.6 kg of acrylonitrile, 5.4 kg of trimethylolpropane triacrylate, 800 kg of potassium persulfate solution, 622.2 kg of butadiene, heat up to 47°C for reaction, and add emulsification when the conversion rate reaches 30~33%. 10.5 grams of potassium stearate solution, 7.5 kilograms of potassium oleate solution, 3.4 kilograms of 1-tris(3-methacrylate) propane and 15 kilograms of acrylonitrile mixed solution and continue to react, and the conversion rate reaches 70~ After adding 10.5 kilograms of emulsifier potassium stearate solution, 7.5 kilograms of potassium oleate solution, 8 kilograms of N, N'-m-phenylene bismaleimide and 25 kilograms...

Embodiment 3

[0070] Add 4449 ml of water into a 10-liter reactor, add 398.56 grams of CP-10 and 15.37 grams of CP-50, disperse under stirring, add 454.59 grams of acrylonitrile, 12.9 grams of trimethylolpropane triacrylate, t-10 4.1 grams of dicarbon mercaptan, 0.17 grams of sodium dithionite, after nitrogen inflation-vacuum displacement, add 1210 grams of butadiene, then add 0.856 grams of cumene peroxide, and control the temperature to 5±0.5 °C to react, and the conversion rate reaches 30 After ~33%, add 75 grams of emulsifier CP-10, 0.65 grams of tertiary dodecyl mercaptan, 3.55 grams of trimethylolpropane triacrylate and 65 grams of acrylonitrile to continue the reaction, and the conversion rate reaches 65~70 After adding 75 grams of emulsifier CP-10, 0.35 grams of tertiary dodecyl mercaptan, 9 grams of N, N'-m-phenylene bismaleimide and 105 grams of acrylonitrile mixed solution, the reaction is continued. After the conversion rate reaches more than 90%, add a terminator, degas after 3...

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Abstract

The invention provides an emulsion polymerization method for preparing a rapid vulcanization butadiene-acrylonitrile rubber. Addition of a pre-crosslinking agent increases degree of branching of a microgel in molecular structure, so as to realize low gel and high microgel content; and a vulcanization cross-linking agent added in the mid-term of a reaction, and the formed molecular structure accelerates vulcanization process in the processing of the rubber, so as to reach good vulcanization effect. As microstructure of rubber molecules is controlled and adjusted, the butadiene-acrylonitrile rubber prepared by the method provided by the invention has high microgel content and low gel content, and can easily form a stereochemical structure during a processing process; and the rubber product has good physical and mechanical properties, increased Mooney viscosity, and correspondingly enhanced tensile strength, elongation at rupture and 300% stress at definite elongation.

Description

technical field [0001] The invention relates to a method for producing rapidly vulcanizable nitrile rubber by means of emulsion polymerization, in more detail, a method for preparing branched microgel structure nitrile rubber by means of emulsion polymerization. Background technique [0002] At present, there are many methods for preparing nitrile rubber by emulsion method, such as continuous polymerization method and batch polymerization method. [0003] During the polymerization process of rubber production, insoluble substances in good rubber solvents will be generated due to increased branching of rubber molecules and chemical crosslinking between molecules, that is, insoluble substances when rubber is in a viscous fluid state. It is the increase of branching of linear molecules or the three-dimensional network-shaped macromolecules formed by the interaction between linear molecules, which is called gel. [0004] Microgels refer to molecules with micro-branches, super-l...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F236/12C08F2/24C08F2/38
Inventor 张元寿张茵刘俊保钟启林潘新明梁滔郑聚成王卫李萍桂强胡育林赵玉中张群陈国永刘晓兰
Owner PETROCHINA CO LTD
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