Unlock instant, AI-driven research and patent intelligence for your innovation.

Method for preparing hydrogenated butadiene-acrylonitrile latex by one-pot method

A technology of hydrogenated nitrile latex and nitrile, which is applied in the field of hydrogenated nitrile latex by one-pot method, can solve the problems of cumbersome operation, adding latex in batches, affecting the processing and use effect of hydrogenated products, and achieves simple and effective conditions and excellent mechanical properties excellent effect

Active Publication Date: 2022-03-08
BEIJING UNIV OF CHEM TECH
View PDF9 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the common problem of the emulsion hydrogenation method is that the hydrogenation product has a gel due to crosslinking, which affects the post-processing and use effect of the hydrogenation product
However, there are also the problems of latex adding in batches, cumbersome operation, or the use of specific metal promoters and cost
[0009] All in all, the existing solution hydrogenation method has the problems of using a large amount of organic solvents and severe restrictions on high temperature and high pressure reaction conditions; while the emulsion hydrogenation method has the problem that the product contains gel , the operation is cumbersome, the co-catalyst is expensive and difficult to recycle, and the mechanical properties of the obtained HNBR vulcanizate are poor

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for preparing hydrogenated butadiene-acrylonitrile latex by one-pot method
  • Method for preparing hydrogenated butadiene-acrylonitrile latex by one-pot method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] The present embodiment provides a kind of preparation method of hydrogenated nitrile latex, comprises the steps:

[0034](1) Add 8mg of Hoveyda-GrubbsII catalyst, 10ml of isopropanol, 10g of sodium dodecylbenzenesulfonate, and 200ml of nitrile emulsion (concentration is 40wt%) into a 500ml autoclave at one time;

[0035] (2) carry out hydrogenation reaction under the conditions of hydrogen pressure 3.0Mpa, reaction temperature 90 ℃ and rotating speed 600rpm;

[0036] (3) After 6 hours of hydrogenation, the degree of hydrogenation reaches 98.9%, and the gel content in the final product is 0%.

[0037] Effect test:

[0038] The hydrogenated product obtained in Example 1 was flocculated with ethanol and then dried to prepare vulcanized rubber. Determination of its Shore hardness, tensile strength, tear strength and other mechanical properties.

[0039] And compared with the hydrogenated nitrile rubber with a degree of hydrogenation of 99% obtained by the solution method...

Embodiment 2

[0045] The present embodiment provides a kind of preparation method of hydrogenated nitrile latex, comprises the steps:

[0046] (1) Add 4mg Hoveyda-GrubbsII catalyst, 5ml tetrahydrofuran, 10ml acetone, 10g sodium lauryl sulfate, 200ml nitrile emulsion (concentration is 25wt%) to a 500ml autoclave in one pot;

[0047] (2) Under the conditions of hydrogen pressure of 3.0Mpa, reaction temperature of 90°C and rotating speed of 600rpm, the hydrogenation reaction is carried out;

[0048] (3) After 6 hours of hydrogenation, the degree of hydrogenation is 99.3%, and the gel content is 0%.

[0049] The spectrum of the obtained product is as figure 2 shown.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention relates to the technical field of hydrogenated butadiene-acrylonitrile latex, in particular to a method for preparing hydrogenated butadiene-acrylonitrile latex through a one-pot method. According to the preparation method of the hydrogenated butadiene-acrylonitrile latex, a co-soluble auxiliary agent and a surfactant are used as hydrogenation accelerators and are mixed with a butadiene-acrylonitrile emulsion and a catalyst at one time, and then hydrogenation reaction is performed; the co-soluble auxiliary agent is one or more of lecithin, stearic acid, chlorobenzene, tetrahydrofuran and a combination of tetrahydrofuran and butanone, tetrahydrofuran and a combination of tetrahydrofuran and acetone, isopropanol, methanol or ethanol. According to the invention, a solution hydrogenation method and an emulsion hydrogenation method are combined, the butyronitrile emulsion is taken as a raw material, and the cosolvent additive is selected to be compounded with the surfactant, so that the purpose of preparing the hydrogenated butyronitrile latex by a one-pot method can be realized under the conditions of a small amount of cosolvent additive and a relatively low catalyst dosage, the production efficiency is greatly improved, and the method is more suitable for industrial production. The obtained product is high in hydrogenation degree and does not contain gel; and vulcanized rubber obtained by subsequent vulcanization has relatively good mechanical properties.

Description

technical field [0001] The invention relates to the technical field of hydrogenated nitrile latex, in particular to a method for preparing hydrogenated nitrile latex in one pot. Background technique [0002] Nitrile rubber (NBR) contains cyano groups (polar groups) in its molecular structure, so it has particularly good oil resistance and has high stability to non-polar or low-polar solvents such as gasoline and aliphatic hydrocarbon oils. However, its chain segment contains unsaturated olefin segment, so the heat resistance and weather resistance are not good, which limits the application of NBR. Therefore, the double bonds in the NBR main chain are usually selectively hydrogenated to improve the heat resistance and weather resistance of NBR. [0003] At present, there are three main methods for preparing hydrogenated nitrile rubber: [0004] Ethylene-acrylonitrile copolymerization method: the reactivity ratios of ethylene and acrylonitrile monomers are quite different (t...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): C08F8/04C08F236/12
CPCC08F8/04C08F236/12Y02P20/584
Inventor 岳冬梅杨志伟张立群
Owner BEIJING UNIV OF CHEM TECH