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Nitrile rubber and preparation method thereof

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

Active Publication Date: 2013-12-04
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • Nitrile rubber and preparation method thereof
  • Nitrile rubber and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] In the reactor, add water 175wt%, disproportionated potassium abietate 4.75wt%, β-naphthalenesulfonate sodium formaldehyde condensate 0.5wt%, potassium chloride 0.25wt%, EDTA 0.015wt%, ferrous sulfate 0.015wt%, Diabolite block 0.06wt%, tert-dodecyl mercaptan 0.275wt%, N-(p-anilinophenyl) methacrylamide 2.0wt%, acrylonitrile 27.0wt%; vacuum 25min, add 0.03wt% Then add 70.5wt% butadiene, stir and cool down to 5°C, add 0.06wt% initiator dicumyl peroxide, and polymerize at 5-8°C;

[0047] When the reaction was carried out for 6.0 hours, the measured conversion rate was 33.6%, and 25% of water was continuously added, disproportionated rosinate potassium 0.95wt%, β-naphthalenesulfonate sodium formaldehyde condensate 0.015wt%, potassium chloride 0.05wt%, EDTA. .005wt% mixed solution for 2.5 hours; when the conversion rate was 38.1%, 0.075wt% of tert-dodecylmercaptan was added continuously, and the mixture of acrylonitrile 0.5wt% was added for 2 hours;

[0048] When the reacti...

Embodiment 2

[0051] In the reactor, add water 175wt%, disproportionated potassium rosinate 4.50wt%, β-naphthalene sulfonate sodium formaldehyde condensate 0.3wt%, potassium chloride 0.25wt%, EDTA 0.025wt%, EDTA (FeNa) 0.015wt% , Diabolite block 0.10wt%, tert-dodecyl mercaptan 0.32wt%, N-(p-anilinophenyl) methacrylamide 2.5wt%, acrylonitrile 28.5wt%; vacuumize 25min, add 0.03wt % oxygen scavenger solution, then add 68.5wt% butadiene, stir and cool down to 5°C, add initiator dicumyl peroxide 0.06wt%, and polymerize at 5-8°C;

[0052] When the reaction was carried out for 5.0 hours, the measured conversion rate was 35.8%, continuously adding water 25%, disproportionated abietate potassium 0.9wt%, β-naphthalenesulfonate sodium formaldehyde condensate 0.1wt%, potassium chloride 0.05wt%, EDTA. .006wt% mixed solution for 2.0 hours; when the conversion rate was 41.5%, add 0.08wt% tertiary-dodecyl mercaptan and the mixture of acrylonitrile 0.5wt% in one go;

[0053] When the reaction was carried o...

Embodiment 3

[0055] In the reactor, add water 175wt%, disproportionated potassium abietate 4.75wt%, β-naphthalene sulfonate sodium formaldehyde condensate 0.375wt%, potassium chloride 0.30wt%, EDTA 0.025wt%, EDTA (FeNa) 0.010wt% , Diaobai block 0.15wt%, tert-dodecyl mercaptan 0.40wt%, N-(p-anilinophenyl) methacrylamide 2.0wt%, acrylonitrile 27.0wt%; vacuumize 30min, add 0.03wt % oxygen scavenger solution, then added 70.5wt% butadiene, stirred and cooled to 5°C, added 0.10wt% initiator dicumyl peroxide, and polymerized at 5-8°C;

[0056] When the reaction was carried out for 5.0 hours, the measured conversion rate was 36.4%, and water 25% was added at one time, disproportionated potassium abietate 0.85wt%, β-naphthalenesulfonate sodium formaldehyde condensate 0.125wt%, potassium chloride 0.06wt%, EDTA 0.005wt% mixed solution; when the conversion rate is 43.1%, add tertiary-dodecylmercaptan 0.10wt% and acrylonitrile 0.5wt% mixture in one go;

[0057] When the reaction was carried out for 10...

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Abstract

The invention relates to a nitrile rubber and a preparation method thereof. The nitrile rubber is prepared from the following polymerization monomers by mass percent: 50-78% of C4-C5 aliphatic conjugate diene monomer, 20-48% of vinyl nitrile monomer and 1.0-5.0% of unsaturated amine or phenolic antioxidant monomer. By adopting a low-temperature polymerization way, an organic peroxide rongalite is used for oxidizing and reducing an initiating system, by increasing the addition of an emulsion system and a molecular weight regulator, the polymerization reaction is carried out smoothly, and molecular parameters of a polymer can be effectively regulated. The preparation method is simple in process and high in polymerization rate, and improves the stability of mucilage in the polymerization process. The content of N-(p-anilino phenyl) unsaturated amide or imide in the polymer is higher, and effective copolymerization of an antiager monomer of the N-(p-anilino phenyl) unsaturated amide or imide and C4-C5 aliphatic conjugate dienes and cyanoethylene is realized.

Description

technical field [0001] The invention relates to a highly stable nitrile rubber with excellent heat resistance and oxidation resistance and a preparation method thereof. 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 antioxidant) uses polymeric antioxidants that are amine or phenolic compounds with dual functions of anti-aging and polymerized monomers. The main chain entering the diene rubber becomes a part of the polymer molecule, so the products of ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F236/12C08F236/10C08F220/60C08F222/40C08F2/26C08F4/40
Inventor 张霖米普科肖瑞许胜潘广勤刘敏齐永新李彤霞范永将张耀亨高卫光李冬红李延盛燕李刚
Owner PETROCHINA CO LTD
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