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Two-component silicone encapsulant and its preparation method and application

A silicone and encapsulant technology, used in adhesives, non-polymer adhesive additives, semiconductor devices, etc., can solve the problems of poor mixing uniformity, affecting product appearance and light efficiency, and uncontrollable glue output. Good clarity and stability, avoids adhesive lamination problems, easy to mix and homogeneous results

Active Publication Date: 2022-08-02
GUANGZHOU BAIYUN CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Generally speaking, the silicone flexible light bar potting glue currently on the market is generally a two-component condensation type, the A component is a polymer, and the B component is a crosslinking agent (usually tetraethyl orthosilicate, commonly known as silicon 28 ), so there is a big difference in viscosity between the two (A component > 5000cP, B component < 30cP), when the dispenser performs glue filling construction, it is easy to have problems such as uncontrollable glue output and poor mixing uniformity
If the cross-linking agent is filled with high-viscosity end-capped 107 glue or methyl silicone oil to increase the viscosity, it is prone to problems such as fogging of the glue, precipitation of flocs, and poor storage stability.
[0005] In addition, manufacturers have higher and higher requirements for production efficiency. Generally, flexible light strips are required to be rewound within 24 hours after potting. However, most of the flexible light strip potting glue currently adds methyl MQ silicone resin Strong toughening, slow vulcanization speed, the hardness cannot reach more than 20 Shore A after 24 hours at room temperature (25°C), resulting in indentations on the silicone layer after the flexible light strip is rolled up, which will affect the appearance and light effect of the product

Method used

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  • Two-component silicone encapsulant and its preparation method and application
  • Two-component silicone encapsulant and its preparation method and application
  • Two-component silicone encapsulant and its preparation method and application

Examples

Experimental program
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preparation example Construction

[0046] Specifically, the preparation method of alkoxy-modified polydimethylsiloxane comprises the following steps:

[0047] Mix side vinyl silicone oil, solvent and catalyst, then add alkoxysilane, keep the reaction temperature at 50℃~70℃ for 5h~7h.

[0048] Further, the alkoxysilane is selected from trimethoxysilane or triethoxysilane. Specifically, its reaction formula can be expressed as follows:

[0049]

[0050]In one specific example, the viscosity of the alkoxysilane-modified polydimethylsiloxane is 500 cP to 1500 cP. Specifically, the viscosity of the alkoxysilane-modified polydimethylsiloxane includes but is not limited to: 500cP, 550cP, 600cP, 700cP, 800cP, 900cP, 950cP, 1000cP, 1150cP, 1200cP, 1300cP, 1400cP, 1450cP, 1500cP .

[0051] In one specific example, the 1,2-bisalkoxysilylethane is selected from the group consisting of 1,2-bistrimethoxysilylethane and 1,2-bistriethoxysilylethane at least one. Preferably, 1,2-bisalkoxysilylethane is selected from 1,2...

Embodiment 1

[0072] The present embodiment provides a two-component silicone encapsulant for the potting of flexible LED light strips, the composition of which is as follows:

[0073]

[0074] The preparation method of the above-mentioned two-component silicone encapsulant is as follows:

[0075] (1) Preparation of component A: add hydroxyl-terminated polydimethylsiloxane (107 glue) and methyl MQ silicone resin into a planetary mixer, and mix for 20 minutes to obtain component A;

[0076] (2) Preparation of component B: Ethoxysilane-modified polydimethylsiloxane, 1,2-bismethoxysilylethane, γ-aminopropyltriethoxysilane, dilaurin Dibutyltin acid is added to the planetary mixer and mixed for 15min until uniform, that is, component B is obtained.

Embodiment 2

[0078] The present embodiment provides a two-component silicone encapsulant for the potting of flexible LED light strips, the composition of which is as follows:

[0079]

[0080] The preparation method of the above-mentioned two-component silicone encapsulant is as follows:

[0081] (1) Preparation of component A: add hydroxyl-terminated polydimethylsiloxane (107 glue) and methyl MQ silicone resin into a planetary mixer, and mix for 20 minutes to obtain component A;

[0082] (2) Preparation of component B: methoxysilane-modified polydimethylsiloxane, 1,2-bismethoxysilylethane, N-βaminoethylγ-aminopropyltrimethoxy Silane and dibutyltin diacetate were added to the planetary mixer, and mixed for 15 minutes until uniform, that is, component B was obtained.

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Abstract

The invention relates to a two-component organosilicon encapsulant and its preparation method and application. The two-component silicone encapsulant includes a component A and a component B; in parts by mass, the component A includes the following components: 100 parts of hydroxyl-terminated polydimethylsiloxane, and methyl MQ 10 to 30 parts of silicone resin; in parts by mass, the component B includes the following components: 100 parts of alkoxysilane-modified polydimethylsiloxane, 1,2-bisalkoxysilyl ethyl 20 to 40 parts of alkane, 3 to 8 parts of a silane coupling agent, and 0.2 to 0.6 parts of an organic tin catalyst. The two-component silicone encapsulant can maintain high transparency under the condition that the viscosity difference between the A component and the B component is small, and the deep curing is fast.

Description

technical field [0001] The invention relates to the technical field of polymer materials, in particular to a two-component organosilicon encapsulant and a preparation method and application thereof. Background technique [0002] LED flexible light strip, also known as LED light strip, is soft and can be curled, and the shape is rich and changeable. Through different LED color combinations, it can show a variety of visual effects. It is widely used in the field of landscape lighting, and is often used in decoration and lighting such as car decoration, signage, advertising signs, wine cabinets, jewelry cabinets, entertainment venues, path and outline signs. [0003] Because it is often used for outdoor lighting, LED flexible light strips need to be encapsulated with glue, which plays a role in waterproofing and protecting the light source. Commonly used potting compounds for LED flexible light strips include epoxy resin, polyurethane and silicone. Among them, silicone potting...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09J183/04C09J183/08C09J11/06H01L33/56
CPCC09J183/04C09J11/06H01L33/56C08L2205/03C08L2205/025C08L2203/206C08L2201/10C08L83/04C08L83/08C08K5/5419C08K5/544
Inventor 刘光华黄文哲黄琪陈永隆陈建军黄恒超缪明松
Owner GUANGZHOU BAIYUN CHEM IND
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