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A kind of high thermal conductivity silicone potting glue and its preparation method and application

A silicone potting compound, high thermal conductivity technology, applied in the field of materials, can solve the problems of weak flame retardant performance, easy aging, only 1.5W, etc., to achieve the effect of excellent tensile strength, excellent thermal conductivity, and simple molding process

Active Publication Date: 2020-09-01
SUZHOU JUFENG ELECTRICAL INSULATION SYST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The potting adhesives currently in the market generally have disadvantages such as poor adhesion, weak flame retardancy, easy aging, and easy melting and falling off when encountering high temperatures. It is difficult to apply to the complex and changeable environment of marine motors.
For example, Chinese patent CN104403626A discloses a high anti-poisoning single-component potting glue for LED drive power supply and its preparation method. The potting glue consists of 100 parts of vinyl polydimethylsiloxane, 100-300 parts of It is prepared by thermally conductive filler, 5-50 parts of hydrogen-containing silicone oil crosslinking agent, 0.01-0.5 parts of curing inhibitor and 0.1-5 parts of platinum complex catalyst. Micro pores have certain thermal conductivity after curing, but the thermal conductivity is only 1.5W / m·K. On the other hand, the potting compound uses commonly used hydrogen-containing silicone oil as a crosslinking agent, which can improve the tensile strength of the potting compound. The strength, elongation at break and hardness do not have a great effect, and there are no other components in the formula that can improve the tensile strength, elongation at break and hardness of the potting compound. Therefore, the tensile strength, fracture The elongation and hardness must not be high, so the potting compound is still difficult to adapt to the complex and changeable environment of marine motors

Method used

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  • A kind of high thermal conductivity silicone potting glue and its preparation method and application
  • A kind of high thermal conductivity silicone potting glue and its preparation method and application
  • A kind of high thermal conductivity silicone potting glue and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] (1) Weigh 25g 3-methacryloxypropylmethyldimethoxysilane, 2g hexamethyldisiloxane, 15g octamethylcyclotetrasiloxane, 25g tetramethylcyclotetrasiloxane Add oxane and 2g of water into a three-necked flask, add 3g of concentrated sulfuric acid under stirring conditions, react at 30°C for 11h, add sodium carbonate to adjust the pH value to neutral, and distill under reduced pressure at 80°C for 3h to obtain the Acrylate based polymethylhydrogensiloxane crosslinker.

[0037] (2) Weigh 40g of low-viscosity end vinyl silicone oil (rotational viscosity of 300mPa.s at 25°C), 60g of high-viscosity end-vinyl silicone oil (rotational viscosity of 1000mPa.s at 25°C), 3g of crosslinking agent, 0.38g Custer catalyst, 0.01g inhibitor, 15g nano-alumina and 100g micro-silicon nitride are uniformly mixed, and then uniformly dispersed under high shear at a line speed of 10m / s, and vacuum degassed in a vacuum drying oven for 15min, namely Obtain the potting glue.

[0038] (3) Pour it into ...

Embodiment 2

[0040] (1) Weigh 30g 3-methacryloxypropylmethyldimethoxysilane, 3g hexamethyldisiloxane, 10g octamethylcyclotetrasiloxane, 20g tetramethylcyclotetrasiloxane Add oxane and 3g of water into a three-necked flask, add 2.5g of concentrated sulfuric acid under stirring conditions, react at 28°C for 11h, add sodium carbonate to adjust the pH value to neutral, and distill under reduced pressure at 90°C for 2.5h to obtain The acrylate-based polymethylhydrogensiloxane crosslinking agent.

[0041] (2) Weigh 35g low-viscosity end vinyl silicone oil, 65g high-viscosity end vinyl silicone oil, 5g crosslinking agent, 0.4g Castel catalyst, 0.01g inhibitor, 30g nano-alumina and 100g micron silicon nitride and mix evenly , and then under high shear at a linear speed of 15m / s, uniformly disperse, and vacuum defoam in a vacuum oven for 20min to obtain the potting compound.

[0042] (3) Pour it into a mold, cure at 120°C for 4 hours, and make samples for various tests.

Embodiment 3

[0044](1) Weigh 20g 3-methacryloxypropylmethyldimethoxysilane, 4g hexamethyldisiloxane, 10g octamethylcyclotetrasiloxane, 25g tetramethylcyclotetrasiloxane Add oxane and 4g of water into a three-necked flask, add 2g of concentrated sulfuric acid under stirring conditions, react at 25°C for 13h, add sodium carbonate to adjust the pH value to neutral, and distill under reduced pressure at 100°C for 2h to obtain the Acrylate based polymethylhydrogensiloxane crosslinker.

[0045] (2) Weigh 40g of low-viscosity end vinyl silicone oil, 60g of high-viscosity end-vinyl silicone oil, 10g of crosslinking agent, 0.42g of Custer catalyst, 0.01g of inhibitor, 60g of nano-alumina and 60g of micron silicon nitride and mix evenly , and then under high shear at a linear speed of 20m / s, uniformly disperse, and vacuum defoam in a vacuum oven for 30min to obtain the potting compound.

[0046] (3) Pour it into a mold, cure at 140°C for 1.5 hours, and make samples for various tests.

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Abstract

The invention relates to a high-heat-conductivity organic silicon potting adhesive, and a preparation method and application thereof. The potting adhesive comprises the following raw materials in percentage by weight: 35-55% of base polymer, 0.5-10% of crosslinking agent, 0.05-0.5% of catalyst, 0.001-0.01% of inhibitor and 40-60% of filler. The base polymer is polysiloxane containing two or more vinyls, and the rotary viscosity at 25 DEG C is 200-4000 mPa.s. The crosslinking agent is prepared by carrying out reaction on 3-methylacryloyloxypropylmethyldimethoxysilane, hexamethyldisiloxane, octamethylcyclotetrasiloxane and tetramethylcyclotetrasiloxane in the presence of water and an acidic catalyst. The potting adhesive has the advantages of excellent heat-conducting property, high salt spray resistance, high / low temperature resistance, ozone corrosion resistance, ultraviolet aging resistance, excellent tensile strength, excellent extension at break, excellent hardness and simple forming technique, and is suitable for complicated and changeable environments of navigation motors.

Description

technical field [0001] The invention belongs to the field of materials, and in particular relates to a high thermal conductivity silicone potting glue and a preparation method thereof, which is especially suitable for marine motors. Background technique [0002] With the development of modern science and technology, various special motors for specific purposes have emerged as the times require, and many requirements have been put forward for the insulation material industry. High thermal conductivity potting compound is just one of them. The high thermal conductivity potting compound used for the insulation treatment of marine motors, because of its special application environment, not only requires the potting material to have certain insulating properties, but also requires it to have excellent salt water resistance, high and low temperature resistance, ozone corrosion resistance, and ultraviolet light resistance Aging and other special properties. The potting adhesives c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09J183/07C09J11/04C09J11/08C09K3/10
CPCC08K2201/003C08K2201/011C08L2201/02C08L2201/08C08L2205/02C08L2205/025C08L2205/03C09J11/04C09J11/08C09J183/04C09K3/10C09K2003/1078C08L83/04C08L83/06C08K2003/2227C08K3/34
Inventor 徐伟红汪统江夏宇温雪平周成
Owner SUZHOU JUFENG ELECTRICAL INSULATION SYST
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