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A kind of preparation method of nitrile rubber with dynamic crosslinking structure

A nitrile rubber, dynamic cross-linking technology, applied in the field of self-healing and reprocessable rubber, to achieve good dynamic reversibility effect

Active Publication Date: 2021-01-05
西安智聚复合材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But at present, there is no report on the dynamic reversible nitrile rubber

Method used

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  • A kind of preparation method of nitrile rubber with dynamic crosslinking structure
  • A kind of preparation method of nitrile rubber with dynamic crosslinking structure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Step 1. Cyanooximation: Dissolve 28.08g (0.177mol) of NBR3305E in 250mL of dichloromethane in a 500mL three-neck flask, mechanically stir at 40°C and reflux to dissolve; pour into 50mL of absolute ethanol after 5 minutes Add 14g (1.23eq) of hydroxylamine hydrochloride and dissolve for 15 minutes; finally, weigh 40g (2.13eq) of sodium carbonate into a three-necked flask, mechanically stir and reflux at 40°C overnight (about 16h).

[0031] (Based on the calculation of cyano group content in nitrile rubber, 1mol cyano group corresponds to 158.5g NBR3305E.)

Embodiment 2

[0032] Example 2: Dissolve 28.08g (0.177mol) of NBR3305E in 250mL of dichloromethane in a 500mL three-necked flask, mechanically stir at 40°C and reflux to dissolve; pour 50mL of ethylene glycol into the solution, and add 14g (1.23 eq) Hydroxylamine hydrochloride was dissolved for 15 minutes; finally, 40 g (2.13 eq) of sodium carbonate was weighed and added into a three-necked flask, and mechanically stirred at 40° C. and condensed and refluxed overnight for reaction (about 16 hours).

Embodiment 3

[0033] Example 3: In a 500mL three-necked flask, 28.08g (0.177mol) of NBR3305E was dissolved in 250mL of dichloromethane, mechanically stirred at 40°C and refluxed to dissolve; at the same time, 14g (1.23eq) of hydroxylamine hydrochloride and 40g (2.13 eq) Sodium carbonate was mixed and added into a beaker filled with 50 mL of ethanol, and stirred by magnetic force for 15-30 min. Subsequently, the latter was added to the dissolved nitrile rubber, and the reaction was carried out overnight at 40°C with mechanical stirring and condensing and reflux (about 16 hours).

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Abstract

The invention relates to a preparation method of butadiene-acrylonitrile rubber with a dynamic cross-linking structure. The butadiene-acrylonitrile rubber is prepared by the steps: oximating a cyano group on butadiene-acrylonitrile rubber, and reacting with an isocyanate crosslinking agent, thereby obtaining the product. Due to the crosslinking reaction between isocyanate and the oximated butadiene-acrylonitrile rubber, a carbamate bond is introduced, and the bond is a necessary condition for forming and maintaining the dynamic butadiene-acrylonitrile rubber structure. By regulating the cyanocontent of the butadiene-acrylonitrile rubber, the crosslinking agent structure and the relative amount of the crosslinking agent, the dynamic butadiene-acrylonitrile rubber of different properties can be prepared. In addition, since the carbamate bond in the butadiene-acrylonitrile rubber crosslinking system has dynamic reversibility under the condition that no catalyst is added, the prepared novel butadiene-acrylonitrile rubber has the recycling and reprocessing capabilities.

Description

technical field [0001] The invention belongs to the field of self-repairable and reprocessable rubber, and relates to a preparation method of nitrile rubber with a dynamic crosslinking structure. Background technique [0002] Nitrile has excellent physical properties and is widely used in the manufacturing field. As a sealing rubber product, it is widely used in aviation and manufacturing, half of which are used in automotive seals. The development of new NBR has broadened new application fields for NBR, and it is also used in some heavy industries abroad. Since NBR modified materials have received extensive attention in recent years and have been invested in a large number of researches, the development path of NBR is very broad. In recent years, the average annual growth rate of NBR annual consumption has been maintained at more than ten percent. Coupled with the rise of some basic industries in my country, the demand for NBR and its subsidiary products in China will ma...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L15/00C08K5/12C08K3/36C08C19/22
CPCC08C19/22C08K3/36C08K5/12C08L15/00
Inventor 张秋禹王文艳宋庆飞尹常杰闫毅
Owner 西安智聚复合材料科技有限公司
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