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Low-temperature-level hydrogenated acrylonitrile butadiene rubber crude rubber and preparation method thereof

A hydrogenated nitrile-butadiene rubber, low-temperature grade technology, applied in the field of modified nitrile-butadiene rubber and its preparation, can solve problems such as unreported, achieve high application value, excellent low temperature resistance, and break technical barriers.

Active Publication Date: 2016-02-03
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Using dibutyl fumarate with diester functional group as the third copolymerized monomer to prepare a low-temperature grade hydrogenated nitrile butadiene rubber raw rubber, which has not been reported at home and abroad.

Method used

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  • Low-temperature-level hydrogenated acrylonitrile butadiene rubber crude rubber and preparation method thereof
  • Low-temperature-level hydrogenated acrylonitrile butadiene rubber crude rubber and preparation method thereof
  • Low-temperature-level hydrogenated acrylonitrile butadiene rubber crude rubber and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] In a 5L reactor, add 192g of butadiene, 72g of acrylonitrile, 216g of dibutyl fumarate, 960g of deionized water, 7.20g of sodium linoleate soap, 7.20g of disproportionated potassium rosinate soap, and 1.12g of phosphoric acid , Potassium hydroxide 1.91g, ethylenediaminetetraacetic acid 0.14g, sodium dinaphthalene sulfonate 0.69g, sodium ferric edetate 0.07g, sodium formaldehyde sulfoxylate 0.10g, tertiary dodecyl mercaptan 1.20 g, stir and mix evenly, then add 0.21g of sodium dithionite and 0.17g of p-menthane to the reaction kettle, adjust the temperature to 8°C, and react for 6h to obtain butadiene-acrylonitrile-fumaric acid di Butyl ester copolymer latex;

[0034] Pour the latex into a calcium chloride solution with a mass fraction of 3% to break the emulsion, and dry it in a vacuum oven at 50°C to obtain butadiene-acrylonitrile-dibutyl fumarate terpolymer rubber raw rubber. The content and molecular weight of each component in the copolymer, the results are listed ...

Embodiment 2

[0037] In a 5L reactor, add 192g of butadiene, 72g of acrylonitrile, 216g of dibutyl fumarate, 960g of deionized water, 7.20g of sodium linoleate soap, 7.20g of disproportionated potassium rosinate soap, and 1.12g of phosphoric acid , potassium hydroxide 1.91g, ethylenediaminetetraacetic acid 0.14g, sodium dinaphthalene sulfonate 0.69g, sodium iron edetate 0.07g, ferrous sulfate 0.10g, tertiary dodecyl mercaptan 1.20g , stir and mix evenly, then add 0.21g of sodium dithionite and 0.19g of p-menthane to the reaction kettle, adjust the temperature to 8°C, and react for 6h to obtain butadiene-acrylonitrile-fumarate dibutyl Ester copolymer latex, pour the latex into a calcium chloride solution with a mass fraction of 3% to break the emulsion, and dry it in a vacuum oven at 50°C to obtain a butadiene-acrylonitrile-dibutyl fumarate terpolymer Type rubber raw rubber, the content and molecular weight of each component in the copolymer were measured, and the results are listed in Table...

Embodiment 3

[0040] In a 5L reactor, add 240g of butadiene, 72g of acrylonitrile, 168g of dibutyl fumarate, 960g of deionized water, 7.20g of sodium linoleate soap, 7.20g of sodium dodecylbenzenesulfonate, Phosphoric acid 1.12g, potassium hydroxide 1.91g, ethylenediaminetetraacetic acid 0.14g, sodium perinaphthalene sulfonate 0.69g, sodium iron edetate 0.07g, sodium formaldehyde sulfoxylate 0.20g, tertiary dodecyl 1.20g of mercaptan, stir and mix evenly, then add 0.21g of sodium dithionite and 0.19g of cumene hydroperoxide into the reaction kettle, adjust the temperature to 8°C, and react for 8h to obtain butadiene-acrylonitrile-trans-butene Dibutyl diacid copolymer type latex, pour the latex into a calcium chloride solution with a mass fraction of 3% to break the emulsion, and dry it in a vacuum oven at 50°C to obtain butadiene-acrylonitrile-fumarate dibutyl Terpolymer type rubber raw rubber, the content and molecular weight of each component in the copolymer were measured, and the result...

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Abstract

The invention provides low-temperature-level hydrogenated acrylonitrile butadiene rubber crude rubber. The low-temperature-level hydrogenated acrylonitrile butadiene rubber crude rubber is a copolymer of butadiene, acrylonitrile and dibutyl fumarate. The number-average molecular weight of the copolymer ranges from 1.05*105 to 3.25*105, the weight-average molecular weight of the copolymer ranges from 3.02*105 to 9.32*105, and the polydispersity index of the copolymer ranges from 2.0 to 2.7. The hydrogenation degree of the low-temperature-level hydrogenated acrylonitrile butadiene rubber crude rubber is more than 90%, and the glass-transition temperature ranges from -38 DEG C to -42 DEG C. The invention further provides a preparation method of the low-temperature-level hydrogenated acrylonitrile butadiene rubber crude rubber. The molecular weight of the low-temperature-level hydrogenated acrylonitrile butadiene rubber crude rubber is high, the glass-transition temperature is low, no crystallization occurs at low temperature, the content of acrylonitrile ranges from 17 mol% to 23 mol%, dibutyl fumarate containing diester-based functional groups is introduced, low-temperature resistance is excellent while good oil resistance is guaranteed, the technical barrier of low-temperature-level hydrogenated acrylonitrile butadiene rubber is broken through, high application value is achieved, and development prospects are broad.

Description

technical field [0001] The invention belongs to the field of organic polymer compounds, and in particular relates to a modified nitrile rubber and a preparation method thereof. Background technique [0002] Hydrogenated nitrile rubber (HNBR) is an elastomer material with excellent comprehensive properties. It is obtained by selectively hydrogenating the carbon-carbon double bonds in the butadiene segment in nitrile rubber (NBR). HNBR not only retains the NBR The original excellent oil resistance, but also has excellent aging resistance, ozone resistance, medium resistance and heat stability, widely used in petrochemical, automobile industry and aerospace and other fields. [0003] However, after NBR is hydrogenated, the molecular chain tends to be saturated, and the flexibility of the molecular chain decreases, resulting in a substantial increase in its glass transition temperature (Tg), which is not conducive to its low-temperature performance. Generally speaking, the Tg of...

Claims

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Application Information

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IPC IPC(8): C08F236/12C08F222/14C08F8/04
Inventor 岳冬梅倪延强陈伟雄陈禹霖张立群
Owner BEIJING UNIV OF CHEM TECH
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