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Process for hydrogenating carboxylated nitrile rubber, the hydrogenated rubber and its use

A hydrogenation reaction, carboxylic acid technology, applied in chemical instruments and methods, rubber layered products, other chemical processes, etc., can solve the problems of uncertain product quality, production stoppage, difficult to control the amount of acid, etc., and achieve excellent wear resistance. good low temperature flexibility, excellent adhesion effect

Inactive Publication Date: 2003-06-04
LANXESS INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, it is difficult to control the amount of acid added to the polymer, so the quality of the product is uncertain
Although products made by this method have been introduced into industrial production, they have been discontinued

Method used

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  • Process for hydrogenating carboxylated nitrile rubber, the hydrogenated rubber and its use
  • Process for hydrogenating carboxylated nitrile rubber, the hydrogenated rubber and its use
  • Process for hydrogenating carboxylated nitrile rubber, the hydrogenated rubber and its use

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] Laboratory tests were carried out with 6% polymer in 2.7 kg chlorobenzene, 184 g of methacrylic acid-acrylonitrile-butadiene statistical terpolymer containing 28% by weight acrylonitrile, 7% methacrylic acid, 65% butadiene, ML 1+4 / 100°C=40 (Krynac X 7.40, available from Bayer) was charged to a 2 US gallon Parr high pressure reactor. In the case of thorough stirring, with pure H 2 (100-200 psi) degas the reactor three times. The temperature of the reactor is raised to 130° C., and under a hydrogen atmosphere, 0.139 g (0.076 phr) of tris(triphenylphosphine)-rhodium(I) chloride in 60 ml of monochlorobenzene having an oxygen content of less than 5 ppm—catalyst A solution of triphenylphosphine (TPP) and 2.32 g of the cocatalyst was charged to the reactor. The temperature of the reactor was raised to 138°C and the pressure of the reactor was set at 1200 psi (83 atm). The temperature of the reactor and the pressure of hydrogen were kept constant throughout the reaction. Af...

Embodiment 2

[0052] Krynac X 7.40 polymer was used in the presence of different amounts of co-catalyst triphenylphosphine (TPP), i.e. 0-4% by weight (based on solid rubber), or a co-catalyst / catalyst ratio of 0-53, and as a polymer solution The catalyst of 0.076% concentration by weight of the terpolymer in the hydrogenation reaction was carried out according to Example 1. the following figure 2 and Table 1 gives the results of the hydrogenation reaction. It is obvious that the presence of cocatalysts can significantly promote the hydrogenation reaction of polymers. Those operations without cocatalyst and those without the process according to the invention are comparative experiments.

[0053] Table 1 Hydrogenation of XNBR (7.0% acid) was performed using different ratios of triphenylphosphine (TPP) to catalyst.

[0054] Catalyst: 0.076phr*, 6% polymer

[0055] *Parts per 100 parts by weight rubber

Embodiment 3

[0057] Another methacrylic acid-acrylonitrile-butadiene copolymer (7% acid, 28% ACN, 65% butadiene) is carried out hydrogenation reaction according to the step of embodiment 1, the difference is that the amount of catalyst is different from the implementation Example 1 is different. The degree of hydrogenation obtained is in the range of 93-99.5%. The results of these experiments are shown in Table 2 and image 3 shown.

[0058] Table 2 Hydrogenation of XNBR (7.0% acid).

[0059] 0.06 wt% Rh, 12% polymer

TPP: Catalyst = 16.7:1

0.096 wt% Rh, 12% polymer

TPP: Catalyst = 16.7:1

time (minutes)

% degree of hydrogenation

%RDB

time (minutes)

% degree of hydrogenation

%RDB

0

0

100

0

0

100

60

84.4

15.6

60

92.4

7.6

80

87.4

12.6

80

95.5

4.5

120

90

10

120

97.2

...

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PUM

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Abstract

Polymers of a conjugated diene, an unsaturated nitrile and an alpha , beta -unsaturated carboxylic acid are selectively hydrogenated to reduce carbon-carbon double bonds, without also reducing carboxyl groups and nitrile groups, using a rhodium-containing compound as catalyst. The hydrogenated polymers are novel and display excellent adhesive properties at both room temperature and high temperature, excellent hot tear strength, and excellent abrasion resistance.

Description

[0001] The present invention relates to a new polymer, its preparation method and its application. Background of the invention [0002] Polymers of conjugated dienes and unsaturated nitriles, ie, nitrile rubbers, are well known. Hydrogenation of nitrile rubber is also known. Hydrogenation improves the heat aging properties of the polymer. When hydrogenating, one really has to be careful to make sure that only carbon-carbon double bonds are hydrogenated. Hydrogenation of the nitrile moiety is to be avoided, eg any reduction of the nitrile groups, and detrimental effects on the properties of the nitrile rubber are undesirable; in particular a reduction in the oil resistance of the nitrile rubber is undesirable. [0003] It has been proposed to include various other copolymerizable monomers in nitrile rubbers. Copolymerizable monomers mentioned are α,β-unsaturated mono- and dicarboxylic acids. While it is possible to incorporate them into the polymer bac...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B32B25/14B32B27/34C08C19/02C08F8/04C08F236/00C08L13/00C08L15/00C09K3/10
CPCC08L13/00C08C19/02C08L15/005
Inventor S·X·郭H·本德
Owner LANXESS INC
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