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Engine oil-resistant low-pressure-change addition type liquid fluorinated silicone rubber and preparation method thereof

A liquid fluorosilicone and addition molding technology, which is applied in the field of rubber materials, can solve the problems of large compression permanent deformation of fluorosilicone rubber, poor curing effect of fluorosilicone rubber, and inability to obtain low pressure deformation, etc., so as to reduce compression permanent deformation and low production cost , to avoid the effect of breaking and slipping

Active Publication Date: 2022-05-10
新元化学(山东)股份有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This document uses ultraviolet light to initiate a crosslinking reaction, which has a poor curing effect on fluorosilicone rubber, and the compression set of liquid fluorosilicone rubber prepared by it is still relatively large, and products with low pressure deformation cannot be obtained
Patent document CN201811003198.3 discloses an addition type fluorosilicone rubber composition and its preparation method, fluorosilicone rubber and coating, the structure of the fluorosilicone rubber base is trifluoropropylmethylsiloxane chain link and dimethyl In the form of copolymerization of siloxane chains, due to the introduction of more dimethylsiloxane chains, its oil resistance is poor, and it cannot be applied to harsh oily environments

Method used

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  • Engine oil-resistant low-pressure-change addition type liquid fluorinated silicone rubber and preparation method thereof
  • Engine oil-resistant low-pressure-change addition type liquid fluorinated silicone rubber and preparation method thereof
  • Engine oil-resistant low-pressure-change addition type liquid fluorinated silicone rubber and preparation method thereof

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preparation example Construction

[0076] The preparation method of hydroxyfluorosilicone oil is as follows:

[0077] Add 220g of ammonia water (concentration 25%) and 460g of distilled water into the reaction kettle equipped with mechanical stirring, thermometer, condenser tube and constant pressure dropping funnel, start stirring to mix the materials evenly, and use frozen brine to reduce the temperature of the kettle to about 0°C , and then drop 300g of trifluoropropylmethyldichlorosilane into the kettle for hydrolysis reaction, the reaction is exothermic, the temperature of the kettle is controlled at 0-10°C during the dropping process, and the stirring reaction is continued for 1-2 hours after the dropping is completed; then the The system was allowed to stand for stratification, and the lower organic phase was removed and neutralized with 10 wt% dilute hydrochloric acid until the system became neutral, then 100 g of distilled water was added to the organic phase, and the organic phase was kept at 40-50 °C ...

Embodiment 1

[0089] The preparation method of oil-resistant low-pressure variable addition molding liquid fluorosilicone rubber comprises the following steps:

[0090] (1) Add 1000g fluorosilicone base rubber (viscosity 57000mPa.s, vinyl mass fraction 0.15%), 50g fumed silica (specific surface area 200m2) into the vacuum kneader 2 / g), 50g precipitated silica (specific surface area 200m 2 / g) and 10g of the hydroxyfluorosilicone oil of the formula (I) structure were kneaded and mixed for 0.5h, and then the remaining 100g of fumed silica, 100g of the precipitated silica, and 35g of the hydroxyfluorosilicone oil of the formula (II) were divided into three batches. Fluoropropylmethylcyclosilazane and 1.5g of divinyltetramethyldisilazane were successively added into the kneader, with an interval of 0.5h for each batch of kneading. After all the materials were added, continue kneading and mixing at room temperature. refining 2h;

[0091] (2) Add 16g of water to the mixing system, turn on the ...

Embodiment 2

[0098] The preparation method of oil-resistant low-pressure variable addition molding liquid fluorosilicone rubber comprises the following steps:

[0099] (1) Add 1000g fluorosilicone base rubber (viscosity 57000mPa.s, vinyl mass fraction 0.15%), 50g fumed silica (specific surface area 200m2) into the vacuum kneader 2 / g), 50g precipitated silica (specific surface area 200m 2 / g) and 20g of the hydroxyfluorosilicone oil of the formula (I) structure were kneaded and mixed for 0.5h, and then the remaining 100g of fumed silica, 100g of the precipitated silica, and 30g of the 30g of the structure of the formula (II) were divided into three batches. Add fluoropropylmethylcyclosilazane and 1g of divinyltetramethyldisilazane into the kneader in turn, kneading interval of each batch is 0.5h, after all materials are added, continue kneading and mixing at room temperature 2h;

[0100] (2) Add 14g of water to the mixing system, turn on the heating, heat the rubber material to 180°C for...

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Abstract

The invention relates to engine oil-resistant low-pressure-change addition type liquid fluorosilicone rubber and a preparation method thereof. The engine oil-resistant low-pressure-change addition type liquid fluorosilicone rubber comprises the following components in parts by weight: 100 parts of fluorosilicone base rubber; 10 to 20 parts of fumed silica; 10-20 parts of precipitated white carbon black; 1-3 parts of hydroxyl fluorosilicone oil; 2 to 5 parts of trifluoropropyl methyl cyclosilazane; 0.1 to 0.3 part of divinyl tetramethyl disilazane; 1-3 parts of distilled water; 0.1 to 0.3 part of a heat-resistant additive; 1.3 to 2.9 parts of a cross-linking agent; 0.3 to 0.6 part of a platinum catalyst; and 0.05 to 0.2 part of an inhibitor. According to the preparation method, fluorosilicone treating agents such as low-molecular-weight hydroxyl fluorosilicone oil and trifluoropropyl methyl cyclosilazane are used, the fumed silica and the precipitated silica are compounded to achieve a synergistic effect, and the specific cross-linking agent and the preparation method are matched, so that the compression set of the addition type liquid fluorosilicone rubber is greatly reduced, and the service life of the addition type liquid fluorosilicone rubber is prolonged. Even if the lubricating oil is soaked in high-temperature engine oil for a long time, the system cannot be damaged, the lower deformation rate can still be kept, and the oil pressure change resistance is very excellent.

Description

technical field [0001] The invention relates to the technical field of rubber materials, in particular to an oil-resistant low-pressure variable-addition molding liquid fluorosilicone rubber and a preparation method thereof. Background technique [0002] Addition-type fluorosilicone rubber has developed rapidly due to the fact that no by-products are produced during the vulcanization process, the shrinkage rate is small, it can be vulcanized deeply, and it is easy to produce highly transparent and oil-resistant products. It can be used for potting and sealing of electronic components. Sealing and electrical appliances industry and other fields. The vulcanization mechanism is that polytrifluoropropylmethylsiloxane containing vinyl and fluorosilicon compound or oligomer containing silicon hydrogen undergo hydrosilylation reaction under the action of platinum catalyst to form a three-dimensional network structure. It has a wide operating temperature range and excellent resista...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L83/08C08K7/26C08K5/5419C08K5/5445C08K3/22C08K9/06
CPCC08L83/08C08L2205/025C08L2312/00C08K2003/2213C08K7/26C08K5/5419C08K5/5445C08K3/22C08K9/06
Inventor 于鹏飞杜辉侯志伟刘晓敏丛洋王华杰田志钢
Owner 新元化学(山东)股份有限公司
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