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Nitrile rubber and preparation method thereof

A technology of nitrile butadiene rubber and vinyl nitrile, applied in the field of high stability nitrile butadiene rubber and its preparation, 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: 2012-09-05
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This patented technology describes making strong stable materials that are resistant against chemical attack from various substances like oxygen gasoline. These materials have good resistance even at very cold temperatures without losing their effectiveness over time due to changes caused by temperature fluctuations. They use specific types of initiator systems with different levels of addition for efficient production. By adding small amounts of certain compounds together they create an enhanced material called neoprenes which help prevent damage when used under harsh conditions. Overall this new type of product has better performance than existing products while maintaining ease of manufacturing.

Problems solved by technology

Technological Problem: Anti-ageing agents made up of chemical components like tetraammonium salt or ethoxynaphthalate cannot resist burning while being exposed to severe environmental factors including sunlight without losing their ability to maintain long term durability. Therefore, there has been developed methods to improve stability against oxidative damage caused by various sources of stress exposure.

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

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Claims

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Application Information

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Owner PETROCHINA CO LTD
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