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Preparation of high-damping rubber containing hindered phenol terminated hyper branched polymer

A hyperbranched polymer and hindered phenol technology, applied in the field of functional polymer materials, can solve the problems of loss of functionality and easy migration, and achieve the effect of improving damping performance and strong controllability of operation process

Inactive Publication Date: 2008-06-25
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are also inherent shortcomings of small molecule additives, such as easy migration, etc.
After a period of use, these small organic molecules added will migrate to the surface of the material, thus losing its functionality

Method used

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  • Preparation of high-damping rubber containing hindered phenol terminated hyper branched polymer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Preparation of nitrile vulcanizate

[0022] In terms of parts by mass: take 100 parts of raw nitrile rubber, 10 parts of HBPE, 2 parts of accelerator dibenzothiazole disulfide (DM), 5 parts of zinc oxide, 1 part of stearic acid, and 1 part of sulfur, as shown in the formula in Table 1. Show.

[0023] Table 1 prepares the formula of nitrile rubber

[0024] Gum

[0025] Mix the above-mentioned raw materials on the open mill, pack 8 times, and then release the film, the thickness of the film should be less than 4mm. Let it stand in a ventilated place for 10 hours, then take a disc with a diameter of about 35mm, and test its vulcanization curve on a rotorless vulcanizer at a temperature of 150°C. When the vulcanization curve tends to be flat, take the time at T90 as the vulcanization time. Then use a flat vulcanizer to vulcanize with the temperature set at 150°C and the pressure at 15MPa. Its mechanical properties are listed in Table 4.

Embodiment 2

[0026] Embodiment 2: select hindered phenol as 3-(3,5-di-tert-butyl-4-hydroxyphenyl) propionic acid, and other preparation conditions are the same as in Example 1

[0027] Preparation of nitrile vulcanizate

[0028] In terms of parts by mass: take 100 parts of raw nitrile rubber, 20 parts of HBPE, 1.5 parts of accelerator dibenzothiazole disulfide (DM), 6 parts of zinc oxide, 1.2 parts of stearic acid, and 1.5 parts of sulfur, as shown in the formula in Table 2 shown.

[0029] Table 2 prepares the formula of nitrile rubber

[0030] Gum

[0031] Mix the above-mentioned raw materials on an open mill, pack them for 10 times, and then release the film. The thickness of the film should be less than 4mm. Let it stand in a ventilated place for 12 hours, then take a disc with a diameter of about 35mm, and test its vulcanization curve on a rotorless vulcanizer at a temperature of 160°C. When the vulcanization curve tends to be flat, take the time at T90 as the vulcanizati...

Embodiment 3

[0032] Embodiment 3: select hindered phenol as 3-(3,5-di-tert-butyl-4-hydroxyphenyl) propionic acid, and other preparation conditions are the same as in Example 1

[0033] Preparation of nitrile vulcanizate

[0034] In parts by mass: 100 parts of raw nitrile rubber, 20 parts of HBPE, 1 part of accelerator dibenzothiazole disulfide (DM), 8 parts of zinc oxide, 1.5 parts of stearic acid, 2 parts of sulfur, as shown in the formula in the table Show.

[0035] Table 3 prepares the formula of nitrile rubber

[0036] Gum

NBR

accelerator disulfide

Dibenzothiazole (DM)

Processing aids

ZnO

stearin

sour

sulfur

HBPE

number of copies

100 copies

1 copy

8 servings

1.5 servings

2 copies

40 copies

[0037] Mix the above-mentioned raw materials on an open mill, pack them for 12 times, and then release the film. The thickness of the film should be less than 4mm. Let it stand in a ventilate...

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Abstract

The invention belongs to the field of functional polymer materials. Aiming at the defect that the small organic molecules are easy to be moved and are easy to low the mechanical properties of a rubber, a hyperbranched polymer promoter capable of effectively enhancing the damping capacity of the rubber is designed. The invention is calcualted in mass percentage: 100 shares of raw rubbers, 10 to 40 shares of terminated hyperbranched polymers of hindered phenol, 0.5 to 1 share of potassium stearates, 3 to 5 shares of stearic acids, 5 to 8 shares of zinc oxides, 1 to 2 shares of sulfurs and 20 to 30 shares of carbon blacks are selected and the raw materials are mixed with each other uniformly on an open mill; the mixtures are subject to the packing mixing for 8 to 12 times; the mixtures are driven to rest for 10 to 16 hours with ventilation and the vulcanization time of the mixtures is tested on a rotor-free curometer at a temperature ranging from 150 DEG C to 170 DEG C; the curing time is recorded after the vulcanization curve flattens out; then the vulcanization is carried out utilizing a platten curometer, the temperature is set to range from 150 DEG C to 170 DEG C corresponding to the rotor-free curometer and the pressure is 15MPa and the strips are taken out. The invention can enhance the damping capacity of the rubber, overcome the defect of a small organic molecular promoter without lowering the mechanical properties of the rubber and maintain the stable performances for a long time.

Description

technical field [0001] The invention relates to using hindered phenol which is generally used as an antioxidant to block aliphatic hyperbranched polyester so as to improve the damping performance of rubber containing polar groups as a functional auxiliary agent, and belongs to the field of functional polymer materials. Background technique [0002] With the development of modern science and technology, noise is more and more widely present in people's lives, together with air pollution and water pollution, it is called the three major public hazards. At the same time, the vibration generated by mechanical operation not only affects the machining accuracy and product quality of the machine, but also accelerates the fatigue damage of the mechanical structure and shortens the service life of the machine. Therefore, shock absorption and noise reduction are becoming more and more important to beautify the environment and reduce pollution. Polymer materials are undoubtedly the id...

Claims

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Application Information

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IPC IPC(8): C08L7/00C08K5/09C08J3/24B29C35/02C08L9/02C08L33/08C08L11/00C08K3/04C08K3/06
Inventor 李效玉王海侨荀国立姜志国何立凡
Owner BEIJING UNIV OF CHEM TECH
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