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High-transparency high-deep-layer-curing-speed double-component condensed organic silicon potting adhesive

A technology of silicone potting glue and deep curing, applied in adhesives, electrical components, circuits, etc., can solve the problems of affecting the appearance of components, poor compatibility, troublesome reinforcing agent synthesis process, etc., and achieve high assembly efficiency and compatibility Good performance, simple and feasible production process

Inactive Publication Date: 2014-09-03
SHANGHAI HUITIAN NEW CHEMICAL MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, some two-component condensation-type transparent silicone products on the market still have some deficiencies in terms of transparency, deep curing speed and deep curing thickness, which affect the quality of component products and the efficiency of production processes.
Since the mechanism of deep curing is that the cross-linking agent in component B is first hydrolyzed with the help of "water" before it can react with the hydroxyl-terminated polysiloxane for cross-linking, so many products add a small amount of water or moisture-containing ingredients to component A. Fillers and additives are used for deep curing; however, siloxane has poor compatibility with moisture, and the method of adding moisture directly leads to a decrease in transparency
[0004] The Chinese patent application number 200910239000 introduces a high-strength two-component condensation-type transparent silica gel. After adding a self-synthesized reinforcing agent, the strength of the silicone rubber exceeds 8MPa, but the deep-layer curing speed and curing thickness have not been significantly improved. Moreover, the synthesis process of the reinforcing agent is cumbersome and complicated; the Chinese patent application number 200910248012 introduces a two-component condensation-type transparent silica gel that can be cured quickly. Amino silicone oil is added to the A component of the glue as a co-catalyst to accelerate crosslinking. Reaction, so that the deep curing speed has been improved, but amino silicone oil is easy to yellow, especially after long-term exposure to outdoor temperature, humidity and ultraviolet rays, which affects the appearance of components

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Mix 5000cps hydroxyl-terminated polydimethylsiloxane and hydroxyl silicone oil with a hydroxyl content of 6% in a weight ratio of 100:2, stir for 1 hour, seal and let it stand for later use, which is component A;

[0043] Mix ethyl polysilicate, dimethyldiethoxysilane, γ-aminopropyltriethoxysilane, and dibutyltin dilaurate in a weight ratio of 25:40:10:15, and stir for 1 hour , sealed, let it stand for at least 1 hour, and set aside, that is, component B.

[0044] Put 100g of component A and 10g of component B into a plastic cup, stir with smooth and clean iron chopsticks for 2 minutes, then vacuum defoam for 3 minutes, and quickly fill it into a LED light bar and a LED module, and place the sample In a constant temperature and humidity room at 25±3°C, RH55±5%, it will be fully cured after 3 hours, with a light transmittance of 95%.

Embodiment 2

[0046] Mix 1500cps hydroxyl-terminated polydimethylsiloxane and hydroxyl silicone oil with a hydroxyl content of 8% in a weight ratio of 100:3, stir for 1 hour, seal it and let it stand for later use, which is component A;

[0047]Mix ethyl silicate, dimethyldimethoxysilane, N-β-aminoethyl-γ-aminopropyltrimethoxysilane, and dibutyltin diacetate in a weight ratio of 30:50:5:2 , after stirring for 1 hour, seal it, let it stand for at least 1 hour, and set it aside, that is, component B.

[0048] Put 100g of component A and 10g of component B into a plastic cup, stir with smooth and clean iron chopsticks for 2 minutes, then vacuum defoam for 3 minutes, and quickly fill it into a LED light bar and a LED module, and place the sample In a constant temperature and humidity room at 25±3°C, RH55±5%, it will be fully cured after 6 hours, with a light transmittance of 94%.

Embodiment 3

[0050] Mix 500cps hydroxyl-terminated polydimethylsiloxane, 6000cps hydroxyl-terminated polydimethylsiloxane, and hydroxyl silicone oil with a hydroxyl content of 10% in a weight ratio of 20:80:8, stir for 1 hour, and seal Let it stand for later use, which is the A component;

[0051] Mix methyltrimethoxysilane, dimethyldiethoxysilane, γ-chloropropyltriethoxysilane and dibutyltin diacetate in a weight ratio of 10:80:15:6, and stir for 1 hour , sealed, let it stand for at least 1 hour, and set aside, that is, component B.

[0052] Put 100g of component A and 10g of component B into a plastic cup, stir with smooth and clean iron chopsticks for 2 minutes, then vacuum defoam for 3 minutes, and quickly fill it into a LED light bar and a LED module, and place the sample In a constant temperature and humidity room at 25±3°C, RH55±5%, it will be fully cured after 5 hours, with a light transmittance of 96%.

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PUM

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Abstract

The invention relates to a high-transparency high-deep-layer-curing-speed double-component condensed organic silicon potting adhesive which comprises a component A and a component B, wherein the component A comprises hydroxyl-terminated polydimethylsiloxane and low-viscosity hydroxy silicon oil; and the component B comprises a crosslinking agent, a chain extender, a coupling agent and a catalyst. Compared with the existing condensed technique, no water or water-containing substance is added into the two components, the low-viscosity hydroxy silicon oil is condensed and dehydrated under the action of the catalyst when the components A and B are mixed, and the water participates into the reaction between the crosslinking agent and hydroxyl-terminated polydimethylsiloxane, thereby finally forming the crosslinked body; and therefore, the potting adhesive provided by the invention avoids transparency decrease due to the addition of the water or water-containing substance, the light transmittance is up to 90% above, and meanwhile, the water molecules which are generated and uniformly released in the A and B reaction process can enable the quick deep layer curing of the whole system. The potting adhesive provided by the invention is applicable to potting electronic components, is especially suitable for integral potting of LED (light-emitting diode) lamp bars, and has higher assembly efficiency.

Description

Technical field [0001] The present invention involves an irrigation material, which is specifically involved in the preparation and application of a dual -component -complicated silicon seal with a highly transparent, deep -curing speed. Background technique [0002] In recent years, room temperature vulcanized liquid silicon rubber has been favored by electronic appliances, wind energy, and solar industries for its excellent high and low temperature resistance, moisture -proof waterproofing, weather resistance, and electrical insulation.Used for sealing and irrigation of LED, electronic components, wind energy motors, and photovoltaic components.The room temperature vulcanized liquid silicon rubber can be divided into single components and dual components according to the packaging method. According to the sulfurization mechanism, it can be divided into contraction type and bonus.Therefore, the current room temperature vulcanized liquid silicon rubber products can be divided int...

Claims

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Application Information

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IPC IPC(8): C09J183/06C09J183/08C09J183/07H01L33/56
Inventor 刘波何秀冲章锋
Owner SHANGHAI HUITIAN NEW CHEMICAL MATERIALS CO LTD
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