Preparation method of acrylonitrile butadiene rubber

A technology of nitrile butadiene rubber and vinyl nitrile, which is applied in the field of preparation of highly stable nitrile butadiene rubber, can solve the problems of unfavorable large-scale production and troublesome operation, and achieve the effects of fast polymerization rate, improved stability and simple process

Active Publication Date: 2015-05-13
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method is cumbersome to operate and is not conducive to large-scale production; its advantage is that the content of antioxidants bonded to the polymer can be easily adjusted according to the end use of the polymer, and polymers with high bonded antioxidant stabilizers can also be used as masterbatches For blending modification of other polymers

Method used

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  • Preparation method of acrylonitrile butadiene rubber
  • Preparation method of acrylonitrile butadiene rubber
  • Preparation method of acrylonitrile butadiene rubber

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] In the reactor, add water 175wt%, disproportionated potassium rosinate 3.50wt%, fatty acid soap 1.50%, β-naphthalene sulfonate sodium formaldehyde condensate 0.5wt%, potassium chloride 0.25wt%, EDTA 0.015wt%, sulfurous acid 0.015wt% iron, 0.06wt% diabolite, 0.30wt% tert-dodecyl mercaptan, 2.0wt% N-(p-anilinophenyl) methacrylamide, 27.0wt% acrylonitrile; vacuumize for 25min , add 0.03wt% oxygen scavenger solution, then add 70.5wt% butadiene, stir and control the temperature to 15-18°C, add 0.09wt% initiator dicumyl peroxide, polymerize for 1.5h, then cool down To 5 ~ 8 ℃, carry out polymerization;

[0050] When the reaction was carried out for 3.5 hours, the measured conversion rate was 34.1%, and 25% of water was added continuously, 0.95wt% of disproportionated abietate potassium, 0.015wt% of β-naphthalenesulfonic acid sodium formaldehyde condensate, potassium chloride 0.05wt%, EDTA The mixed solution of 0.005wt% was added for 1.5 hours; when the conversion rate was 38...

Embodiment 2

[0054] In the reactor, add water 175wt%, disproportionated potassium rosinate 4.75wt%, β-naphthalene sulfonate sodium formaldehyde condensate 0.3wt%, potassium chloride 0.25wt%, EDTA 0.025wt%, EDTA (FeNa) 0.015wt% , Diaobai block 0.10wt%, tert-dodecyl mercaptan 0.32wt%, N-(p-anilinophenyl) methacrylamide 2.5wt%, acrylonitrile 28.5wt%; vacuum 25min, add 0.03wt % oxygen scavenger solution, then add butadiene 68.5wt%, stir and control the temperature to 15-18°C, add the initiator dicumyl peroxide 0.085wt%, after polymerization for 2 hours, cool down to 5-8°C , for aggregation;

[0055] When the reaction was carried out for 3.25 hours, the measured conversion rate was 33.4%, and 25% of water was continuously added, 0.9wt% of disproportionated abietate potassium, 0.1wt% of β-naphthalenesulfonate sodium formaldehyde condensate, potassium chloride 0.05wt%, EDTA 0.006wt% mixed solution for 2.0 hours; when the conversion rate is 41.5%, a mixture of 0.10wt% tertiary-dodecylmercaptan an...

Embodiment 3

[0058] In the reactor, add 175wt% of water, 4.75wt% of disproportionated potassium abietate, 0.35wt% of β-naphthalenesulfonate sodium formaldehyde condensate, 0.30wt% of potassium chloride, 0.025wt% of EDTA, 0.0125wt% of EDTA (FeNa) , Diaobai block 0.175wt%, tert-dodecyl mercaptan 0.42wt%, N-(p-anilinophenyl) methacrylamide 2.0wt%, acrylonitrile 27.0wt%; vacuum 30min, add 0.03wt % oxygen scavenger solution, then add 70.5wt% butadiene, stir and control the temperature to 15-18°C, add the initiator dicumyl peroxide 0.10wt%, after polymerization for 3 hours, cool down to 5-8°C , for aggregation;

[0059] When the reaction was carried out for 3.10 hours, the measured conversion rate was 37.9%, and 25% of water was added at one time, 0.85wt% of disproportionated abietate potassium, 0.125wt% of β-naphthalenesulfonate sodium formaldehyde condensate, 0.06wt% of potassium chloride, A mixed solution of 0.005wt% EDTA; when the conversion rate is 43.1%, a mixture of 0.12wt% tert-dodecylm...

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Abstract

The invention relates to a preparation method of an acrylonitrile butadiene rubber. The method includes: adding a water solution of an emulsifier with a dosage of 75-85%, a dispersant, electrolyte, and a chelating agent, and a water solution of a reducing agent and an activating agent into a reaction kettle; mixing N-(p-anilinephenyl) unsaturated amide or imide and vinyl nitrile with a molecular weight regulator with a dosage of 70-85%, and adding the mixture into the reaction kettle; conducting vacuum pumping for 15-30min, then adding a deoxidant water solution, an aliphatic conjugated diene monomer of C4-C5, controlling the temperature to 5-8DEG C, adding an initiator solution to undergo reaction; when the reaction conversion rate reaches 30-50%, adding the remaining emulsifier, dispersant, electrolyte, and chelating agent into the kettle; adding the remaining molecular weight regulator into a polymerization kettle; when the conversion rate reaches 60-80%, terminating the process. The acrylonitrile butadiene rubber provided in the invention has a glass transition temperature ranging from -65DEG C to -10DEG C, and Mooney viscosity (ML1+4<100DEG C>) adjustable from 40 to 120.

Description

technical field [0001] The invention relates to a preparation method of highly stable nitrile rubber with excellent heat resistance and oxidation resistance. Background technique [0002] Traditional anti-aging agents commonly used in the synthetic rubber industry are easily volatilized from rubber or extracted by oil and petroleum products during use, making rubber lose resistance to thermal oxygen. The anti-aging agent that can be chemically combined in the rubber chain can make the rubber have excellent properties, such as N-(4-anilinophenyl) methacrylamide is one of the effective reactive anti-aging agent monomers. Polymerized stabilized nitrile rubber (emulsion polymerization product of butadiene, acrylonitrile, polymerized anti-aging agent) uses a polymeric anti-aging agent that is an amine or phenolic compound with dual functions of anti-aging and polymerizing monomers. The main chain entering the diene rubber becomes a part of the polymer molecule, so the products o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F236/12C08F222/40C08F220/60C08F2/26C08F2/38C08F4/40
Inventor 米普科张霖肖瑞许胜齐永新潘广勤刘敏张耀亨范永将李冬红高卫光熊玉洁刘栓祥赵小龙张志高张守汉张建平李彤霞刘伟吴志祥
Owner PETROCHINA CO LTD
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