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Preparation method of tackifier for addition type liquid silicone rubber

A liquid silicone rubber and tackifier technology, applied in the direction of adhesive additives, non-polymer adhesive additives, etc., can solve the problems of reducing LED life, yellowing, reducing LED light efficiency, etc., to achieve compatibility Good, excellent adhesive strength, good storage stability

Inactive Publication Date: 2016-04-13
HANGZHOU FIRST APPLIED MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the Chinese patent application with the publication number CN103275325A, in order to improve the adhesion between the encapsulant and the metal, a polyborosiloxane tackifier was prepared, which is good for the bonding of the metal part and the plastic part in the bracket. The former is strong and the latter is weak, which will cause moisture and oxygen to enter the bracket and reduce the life of the LED
In addition, the encapsulants using synthetic tackifiers containing epoxy groups and ester groups will turn yellow after long-term aging, which will reduce the light efficiency of LEDs.

Method used

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  • Preparation method of tackifier for addition type liquid silicone rubber

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Under a nitrogen atmosphere and an ice-water bath, add 20 parts of methacryloxypropyltrimethoxysilane, 100 parts of tetramethylcyclotetrasiloxane, and 0.1 part of chloroplatinic acid catalyst into the reactor, and stir evenly; While stirring, slowly add 30 parts of vinyltrimethoxysilane dropwise, after 0.5h, the dropwise addition is completed, and the reaction is stirred at a constant temperature for 1.0h; the temperature rise rate is controlled at 1.0°C / min, the temperature is raised to 40°C, and the reaction is stirred at a constant temperature for 6.0h; Under a vacuum of 0.04MPa, the temperature was further raised to 100°C, and the temperature was lowered until no fraction flowed out. Stop vacuuming, stop stirring, fill with nitrogen, cool down to room temperature, and obtain the expected tackifier. The stirring rate of the whole reaction was 200r / min.

Embodiment 2

[0022] Under a nitrogen atmosphere and an ice-water bath, add 50 parts of methacryloxypropyltrimethoxysilane, 140 parts of tetramethylcyclotetrasiloxane, and 0.3 parts of chloroplatinic acid catalyst into the reactor, and stir evenly; At the same time, 50 parts of vinyltriethoxysilane was slowly added dropwise, and the dropwise addition was completed for 1.0h, and the reaction was stirred at a constant temperature for 3.0h; the temperature increase rate was controlled at 1.0°C / min, and the temperature was raised to 70°C, and the reaction was stirred at a constant temperature for 2.0h; Under the vacuum degree of 0.06MPa, the temperature was further raised to 80, and the temperature was lowered until no fraction flowed out. Stop vacuuming, stop stirring, fill with nitrogen, cool down to room temperature, and obtain the expected tackifier. The stirring rate of the whole reaction was 250r / min.

Embodiment 3

[0024] Under a nitrogen atmosphere and an ice-water bath, add 40 parts of methacryloxypropyltrimethoxysilane, 130 parts of hydrogen-containing silicone oil or tetramethylcyclotetrasiloxane, and 0.2 parts of chloroplatinic acid catalyst into the reactor, and stir Evenly; while stirring, slowly add 45 parts of vinyltriacetoxysilane dropwise, 1.0h after the dropwise addition, and keep stirring for 2.0h at a constant temperature; control the heating rate at 1.0°C / min, raise the temperature to 65°C, and stir at a constant temperature for 2.5 h; under the vacuum degree of -0.04MPa, the temperature was further raised to 100°C, and the temperature was lowered until no fraction flowed out. Stop vacuuming, stop stirring, fill with nitrogen, cool down to room temperature, and obtain the expected tackifier. The stirring rate of the whole reaction was 250r / min.

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Abstract

The invention discloses a preparation method of a tackifier for addition type liquid silicone rubber. The tackifier is obtained by the preparation method through a chemical reaction, by combining polyhydrosiloxanes or tetramethyl cyclotetrasiloxane, and bonding two categories of silane coupling agents including vinylsilane and methacryloxy silane. Active groups are more due to the synergistic effect of the silane coupling agents of vinylsilane and the methacryloxy silane. Hence, the tackifier has better cohesiveness compared with a traditional tackifier KH570. The tackifier prepared by the invention is of colorless and clear liquid with the refractive index being 1.42, has good intersolubility with methylsilicone oil and methyl silicone resin, and turbidity phenomena do not exist. Package resin using the tackifier has excellent bonding strength and yellowing resistance on substrates such as metallic aluminium, polyphthalamide (PPA) and polycarbonate (PC).

Description

technical field [0001] The invention relates to a silane coupling agent, a tackifier and a silicone encapsulant, in particular to a tackifier for improving the bonding strength of the silicone encapsulant, namely a method for preparing a tackifier for addition-type liquid silicone rubber . Background technique [0002] Silicone encapsulants have good weather resistance, hydrophobicity, and excellent electrical insulation properties, and are widely used in machinery, electronic appliances, automobiles, photovoltaics and other industries. Addition-type liquid silicone rubber is non-polar, the main chain is composed of silicon-oxygen bonds, and a layer of non-polar alkyl groups is arranged outside the main chain, resulting in low surface energy of the material and low adhesion to the material. Therefore, the addition-type liquid silicone rubber has poor adhesion when used as a packaging material for potting, coating, LED packaging, and insert injection molding materials. At p...

Claims

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Application Information

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IPC IPC(8): C08G77/20C08G77/06C08G77/12C09J11/06
CPCC08G77/20C08G77/06C08G77/12C09J11/06
Inventor 韩志远高传花江昊张利安林天翼周光大
Owner HANGZHOU FIRST APPLIED MATERIAL CO LTD
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