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Formula of high-hardness easy-to-produce nitrile rubber

A nitrile rubber and formulation technology, which is applied in the field of high-hardness and easy-to-produce nitrile-butadiene rubber formulations, can solve the problems of poor rubber fluidity and high NBR hardness drop rate, and achieves easy processing of rubber materials, reduced hardness drop rate, and qualified product appearance. high rate effect

Pending Publication Date: 2022-05-24
CHONGQING LINGFENG RUBBER PROD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a high-hardness and easy-to-produce nitrile rubber formula, which solves the problems of high hardness reduction rate and poor fluidity of the existing NBR.

Method used

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  • Formula of high-hardness easy-to-produce nitrile rubber

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] The invention is a high-hardness and easy-to-produce nitrile-butadiene rubber formula, and the NBR formula is composed of the following raw materials: 33.0 parts of NBR+PVC rubber-plastic alloy; 36.0 parts of carbon black; 1.7 parts of softener; 3.0 parts of active agent; 2.9 parts of anti-aging agent; 1.2 parts of accelerator; 3.0 parts of phenolic resin; 0.6 part of modified hexamethylenetetramine.

[0021] Further, carbon black is used as a reinforcing agent as a filler to improve the strength of rubber products. The consumption of carbon black generally accounts for 40% to 50% of the consumption of rubber. Usually, 2 parts of rubber are used together with 1 part. carbon black; NBR+PVC rubber-plastic alloy refers to the mixture of nitrile rubber and polyvinyl chloride, and the weight of polyvinyl chloride is 20% to 30% of the weight of butadiene rubber.

[0022] Further, softener is a foam additive with softening effect under higher chemical foaming agent water consu...

Embodiment 2

[0029] When using this high-hardness and easy-to-produce NBR formula for rubber production, appropriately reduce the amount of carbon black added, reasonably adjust the fluidity requirements of the rubber compound, add phenolic resin and modified hexamethylenetetramine, and the material and rubber during high temperature vulcanization. The polymer undergoes chemical cross-linking, the cross-density increases, and the hardness reaches more than 90 degrees. After the product is heated, the hardness decrease rate is greatly reduced. The phenolic resin is generally added at 8-15%, and the modified hexamethylenetetramine is generally added at 0.6 -1.2% is added. After the two are properly matched, the rubber material is easy to process, the film is smooth and flat, the rubber material has good fluidity, the product has a thin burr, and the product appearance qualification rate is over 99%.

Embodiment 3

[0031] According to whether phenolic resin and modified hexamethylenetetramine are added to the NBR formula, the hardness of the rubber produced is compared, and the rubber without phenolic resin and modified hexamethylenetetramine is selected as the control group, and the rubber with phenolic resin is selected as the control group. As group A, the modified hexamethylenetetramine was selected as the B group, and the phenolic resin and modified hexamethylenetetramine were selected as the C group. The configured rubber hardness is shown in the table below:

[0032] Table 1: Rubber hardness prepared with different additives

[0033]

[0034]

[0035] It can be seen from the above table that the rubber hardness produced by the formula with the addition of phenolic resin and modified hexamethylenetetramine is the highest.

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Abstract

The invention discloses a high-hardness easy-to-produce nitrile rubber formula, and relates to the technical field of rubber production research. The formula of the NBR comprises the following raw materials: 33.0 parts of NBR + PVC rubber and plastic alloy; 36.0 parts of carbon black; 1.7 parts of a softening agent; 3.0 parts of an active agent; 2.9 parts of an anti-aging agent; 1.2 parts of a vulcanization accelerator; 3.0 parts of phenolic resin; and 0.6 part of modified hexamethylenetetramine. According to the high-hardness easy-to-produce NBR formula disclosed by the invention, when the high-hardness easy-to-produce NBR formula is used for producing rubber, the addition amount of carbon black is properly reduced, the fluidity requirement of a rubber material is reasonably adjusted, phenolic resin and modified hexamethylenetetramine are added, and the material and rubber macromolecules are chemically crosslinked during high-temperature vulcanization, so that the crosslinking density is increased, and the hardness reaches 90 degrees or above; and after the product is heated, the hardness reduction rate is greatly reduced.

Description

technical field [0001] The invention belongs to the technical field of rubber production research, in particular to a formula of high-hardness and easy-to-produce nitrile-butadiene rubber. Background technique [0002] NBR is a copolymer of acrylonitrile and butadiene monomers. It is mainly produced by low-temperature emulsion polymerization. It has excellent oil resistance, high wear resistance, good heat resistance, and strong adhesion. The disadvantages are poor low temperature resistance, poor ozone resistance, poor insulation performance, and slightly low elasticity. NBR is mainly used to manufacture oil-resistant rubber products. The content (%) of acrylonitrile in NBR is 42~46, 36~41, 31~35, 25~ 30, 18-24, etc. The more acrylonitrile content, the better the oil resistance, but the cold resistance is correspondingly reduced, it can be used for a long time in the air at 120 ℃ or in the oil at 150 ℃, and has good water resistance , air tightness and excellent bonding pe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L9/02C08L27/06C08L61/06C08K5/3477C08K3/04
CPCC08L9/02C08L2312/00C08L27/06C08L61/06C08K5/3477C08K3/04
Inventor 周亮刘光超刘春红
Owner CHONGQING LINGFENG RUBBER PROD
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