A kind of preparation method of primer for addition type silicone potting glue

Abstract

The invention discloses a preparation method of a primer for an addition type organosilicone potting adhesive, which is implemented by coating the primer on the surface of a base material; potting the organosilicone potting adhesive on the base material; reacting hydrosilicofluoric groups in the structure of the primer with silicon vinyl in the addition type liquid silicone rubber so as to form a 'bridge' which closely adheres the organosilicone potting adhesive to the surface of the base material, thereby obtaining an excellent bonding performance.

Description

technical field [0001] The invention belongs to the field of chemical materials, and relates to a filling material for encapsulation, in particular to a primer for addition-type silicone potting glue, a preparation method and application thereof. Background technique [0002] The noun of potting or sealant has played an indispensable role in modern life, and is often seen in, for example: window frames, door frames, wainscoting, trim, skylights, gutters, ventilation holes, bridge filling repairs, In the application of building structure curtain wall and caulking, caulking and sealing of pipes, general potting adhesives usually need to be exposed to air and different temperature environments for a long time, so they need to have functions such as weather resistance, waterproof and water vapor barrier. In the environment of long-term exposure to ultraviolet radiation, additives are added to make it anti-ultraviolet. [0003] Potting adhesives can also be used in LED applicati...

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Problems solved by technology

[0004] In the past, LEDs still had the problems of poor heat dissipation and low light output rate, because heat dissipation directly affects the reliability of LEDs, and then affects their life and applications, and the low light output rate directly limits the development of LEDs. Existing technologies exist The light extraction efficiency is low, generally only up to 92%, even better than 95%, and the light cannot be refracted from the potting material on the surface of the device, so that the light loss during refraction is too large, more than 8%

[0005] The purpose of using potting glue is to have the function of sealing and caulking, but often when the potting glue is used for caulking, the surface energy of the potting glue is low due to the curing reaction, and the adhesion to the substrate is very poor, and Often the resin will shrink after curing. When the adhesion between the potting compound and the substrate is improved by adding a tackifier, it will lead to poor sealing and caulking effects, or insufficient strength to make a slight touch Touching the seal will cause it to fall off; or with long-term exposure to the external environment, dust will accumulate and penetrate into the potting compound, resulting in reduced sealing and caulking effects; moreover, prolonged exposure to moisture Under the environment or light irradiation, the potting compound will turn yellow and the effect of sealing and caulking will be reduced.

[0006] In addition, there are many restrictions on the use of general potting adhesives, for example: usually no additional treatment, such as painting to maintain the appearance of the exterior, is not suitable for long-term immersion in water or underground applications, when curing reaction Requires moisture to cure, not suitable for applications where abrasion and physical damage would damage the sealant, or for substrates with porous surfaces

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