Organic silicon pouring sealant and preparation method thereof

A technology of silicone potting glue and base glue, applied in adhesives, photovoltaic power generation, adhesive additives, etc., can solve the problems of silicone potting glue, poor mechanical properties, poor thermal conductivity, etc., and improve the outdoor service life , good protection, high anti-UV effect

Active Publication Date: 2020-12-15
广州硅芯材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Most of the silicone potting adhesives commonly used in the market are made of high-viscosity 107 silicone rubber and white carbon black and other reinforcing fillers to produce the base rubber, using ethyl orthosilicate, propyl orthosilicate, methyl triethyl Oxysilane and other non-aryl cross-linking agents, add a large amount of 201 methyl silicone oil or white oil as a diluent for silicone potting adhesives, these substances do not undergo cross-linking reactions during the curing process of the colloid, and when exposed to UV for a long time After being exposed for a long time, it will degrade and become sticky, and lose its protective effect on the PCB board, resulting in a short service life of the LED display; for example, the mechanical properties and thermal conductivity of silicone rubber without filling and reinforcement are poor, and the thermal conductivity is only 0.27W / (m·K), and the flame retardant performance is poor, which cannot meet the specific requirements of potting and sealing of LED small-pitch displays
It is particularly difficult to prepare silicone potting adhesives with good leveling properties and high UV resistance
So far, similar products on the market are rare

Method used

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  • Organic silicon pouring sealant and preparation method thereof
  • Organic silicon pouring sealant and preparation method thereof
  • Organic silicon pouring sealant and preparation method thereof

Examples

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preparation example Construction

[0033] The preparation method of the above-mentioned silicone potting compound comprises the following steps:

[0034] (1) Add double-terminated hydroxyl polydisiloxane B and semi-reinforcing filler into the dispersion container, raise the temperature to 110-125°C and blend for 30-90 minutes, after the blending, let stand and cool to below 50°C, grind , to obtain base glue;

[0035] (2) Add the base glue obtained in step (1), double-terminated hydroxyl polydisiloxane A, liquid MQ resin, plasticizer A, pigment and deep curing agent into the high-speed dispersion kettle, stir evenly, evacuate, cool, Component A can be obtained;

[0036] (3) Add crosslinking agent, coupling agent, organotin catalyst and plasticizer B into the kettle, stir evenly, after aging, filter out the precipitate to obtain component B;

[0037] (4) Mix component A and component B evenly, and obtain the silicone potting glue after defoaming.

[0038] Preferably, the mass ratio of base gum to double-terminat...

Embodiment 1

[0045] A silicone potting glue, its preparation raw materials include component A and component B, the preparation raw materials of said component A include in parts by mass: base glue 100 parts by mass, double-terminated hydroxyl polydisiloxane A 28.6 Parts by mass, 12.8 parts by mass of liquid MQ resin, 9.6 parts by mass of dimethyl silicone oil (viscosity 100mPa.s), 1.3 parts by mass of carbon black slurry and 1.2 parts by mass of deep curing agent; the raw materials for the preparation of component B are in parts by mass Including: 40 parts by mass of phenyltrimethoxysilane, 20 parts by mass of N-(β-aminoethyl)-γ-aminopropyltrimethoxysilane, 0.5 parts by mass of dibutyltin dilaurate, 100 parts by mass of dimethyl Silicone oil (viscosity 100mPa.s); the raw materials for the preparation of the base rubber include: double-terminated hydroxyl polydisiloxane B and aluminum hydroxide, and the mass ratio of the two is 100:180. The viscosities of the double-terminated hydroxyl pol...

Embodiment 2

[0052] A silicone potting glue, its preparation raw materials include component A and component B, the preparation raw materials of said component A include in parts by mass: base glue 100 parts by mass, double-terminated hydroxyl polydisiloxane A 28.6 Parts by mass, 12.8 parts by mass of liquid MQ resin, 9.6 parts by mass of dimethyl silicone oil (viscosity 100mPa.s), 1.3 parts by mass of carbon black slurry and 1.2 parts by mass of deep curing agent; the raw materials for the preparation of component B are in parts by mass Including: 35 parts by mass of phenyltrimethoxysilane, 20 parts by mass of N-β-(aminoethyl)-γ-aminopropyltrimethoxysilane, 0.5 parts by mass of dibutyltin dilaurate, 100 parts by mass of dimethyl Silicone oil (viscosity: 100 mPa.s); the raw materials for the preparation of the gum base include: double-terminated hydroxyl polydisiloxane B and aluminum hydroxide, and the mass ratio of the two is 100:180. The viscosities of the double-terminated hydroxyl poly...

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Abstract

The invention relates to the technical field of high polymer materials, in particular to an organic silicon pouring sealant and a preparation method thereof. The organic silicon pouring sealant is prepared from a component A and a component B. The component A is prepared from the following raw materials in parts by mass: 100 parts of base glue, 20-100 parts of double hydroxyl-terminated polydisiloxane A, 6-12.8 parts of liquid MQ resin, 0-9.6 parts of a plasticizer A, 1.3 parts of pigment and 1.2 parts of a deep curing agent. The component B is prepared from the following raw materials in parts by mass: 100 parts of a plasticizer B, 10-40 parts of a cross-linking agent, 5-25 parts of a coupling agent and 0.5-2 parts of an organic tin catalyst; wherein the viscosity of the double hydroxyl-terminated polydimethylsiloxane is 200 to 750 mPa.s, and the base rubber is prepared from the following raw materials: double hydroxyl-terminated polydisiloxane B and a semi-reinforcing filler. The organic silicon pouring sealant provided by the invention is an organic silicon pouring sealant with good leveling property and high UV resistance, and can be well used as a pouring sealant for LED small-spacing display screen modules.

Description

technical field [0001] The invention relates to the technical field of polymer materials, in particular to a silicone potting glue and a preparation method thereof. Background technique [0002] Silicone polymer materials have unique weather resistance, aging resistance, excellent high and low temperature resistance, good hydrophobicity, mechanical properties and electrical insulation due to the special silicon-oxygen bond main chain structure, so they are widely used in Potting protection of electronic and electrical components. [0003] With the development of the electronics industry, high-tech technologies such as electronic components and large-scale integrated circuit boards tend to be dense and miniaturized. getting thinner. This requires that the potting material not only has good fluidity, excellent high and low temperature resistance, electrical insulation, thermal conductivity and flame retardancy, but also has weather resistance. Most of the silicone potting a...

Claims

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Application Information

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IPC IPC(8): C09J183/04C09J11/04C09J11/06
CPCC09J183/04C09J11/04C09J11/06C08K2003/2227C08L2205/035C08L2205/025C08L2203/206C08L2201/08C08L83/04C08K3/22C08K3/04C08K5/5419C08K5/544C08K13/02Y02E10/50
Inventor 陈循军尹国强胡巧玲葛建芳
Owner 广州硅芯材料科技有限公司
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