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Pouring sealant as well as preparation method and application thereof

A technology of potting glue and vinyl polymethyl vinyl siloxane, which is applied in the field of potting glue, can solve the problems of unfavorable mobile phone charger potting, rapid heat conduction, poor fluidity, etc. Glue and repair seam, huge market prospect, the effect of reducing viscosity

Inactive Publication Date: 2020-11-10
SHENZHEN XINYA NEW MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the thermal conductivity is too high, the heat of the components will be quickly transferred to the plastic casing, which will accelerate the aging of the casing and cause yellowing and other problems.
Products with high thermal conductivity usually cause high viscosity and poor fluidity, which is not conducive to the potting and sealing of mobile phone chargers with small volume and high production efficiency
In addition, the shell of the mobile phone charger or some small-sized products that need to be potted will have gaps in some sizes that will cause glue leakage

Method used

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  • Pouring sealant as well as preparation method and application thereof
  • Pouring sealant as well as preparation method and application thereof
  • Pouring sealant as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] (1) Preparation of component A

[0058] 1) Take 100 parts by mass of vinyl-terminated polymethylvinylsiloxane (the vinyl content is 1.80wt%, the viscosity is 100mPa·s (20°C), the model is Runhe RH-Vi32, the following examples 2- 6. Comparative examples 1 to 3 used vinyl-terminated polymethylvinylsiloxane of the same nature), 0.1 parts by mass of dimethyldimethoxysilane were added to the reactor, and stirred and dispersed for 5 minutes;

[0059] 2) Add 100 parts by mass of aluminum oxide and aluminum hydroxide powder (the average particle size of aluminum oxide and aluminum hydroxide powder is 10 μm, the same below) into the reactor twice, turn on the heating, and reach 120°C Turn on the vacuum (vacuum degree is 0.095Mpa) and continue to stir and react for 0.5h;

[0060] 3) Cool the product of step 2) to room temperature, transfer it to a planetary machine, and then add 10 parts by mass of simethicone oil (viscosity 10mPa·s, model Dow Corning PMX-200, the following exam...

Embodiment 2

[0068] (1) Preparation of component A

[0069] 1) Add 100 parts by mass of vinyl-terminated polymethylvinylsiloxane and 1 part by mass of dimethyldiethoxysilane into the reactor, stir and disperse for 5 minutes;

[0070] 2) Add 300 parts by mass of inorganic powder alumina into the reactor twice, turn on the heating, turn on the vacuum at 140°C (vacuum degree is 0.095Mpa) and continue to stir and react for 1 hour;

[0071] 3) Cool the product of step 2) to room temperature, transfer to the planetary machine and add 20 parts by mass of simethicone oil, 0.5 parts by mass of castor catalyst, and 0.01 parts by mass of nano boron nitride thixotropic agent, stir Evenly.

[0072] (2) Preparation of component B

[0073] 1) Add 100 parts by mass of vinyl-terminated polymethylvinylsiloxane and 1 part by mass of dimethyldiethoxysilane into the reactor, stir and disperse for 5 minutes;

[0074] 2) Add 300 parts by mass of inorganic powder alumina into the reactor twice, turn on the hea...

Embodiment 3

[0078] (1) Preparation of component A

[0079] 1) Add 100 parts by mass of vinyl-terminated polymethylvinylsiloxane and 1 part by mass of dodecyltrimethoxysilane into the reactor, stir and disperse for 5 minutes;

[0080] 2) Add 300 parts by mass of inorganic powder alumina into the reactor twice, turn on the heating, turn on the vacuum at 140°C (vacuum degree is 0.095Mpa) and continue to stir and react for 1h;

[0081] 3) Cool the product of step 2) to room temperature, transfer it to a planetary machine, add 20 parts by mass of simethicone oil, 0.5 parts by mass of catalyst, and 0.2 parts by mass of nano boron nitride thixotropic agent, and stir evenly .

[0082] (2) Preparation of component B

[0083] 1) Add 100 parts by mass of vinyl-terminated polymethylvinylsiloxane and 1 part by mass of dodecyltrimethoxysilane into the reactor, stir and disperse for 5 minutes;

[0084] 2) Add 300 parts by mass of inorganic powder alumina into the reactor twice, turn on the heating, t...

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Abstract

The invention discloses a pouring sealant as well as a preparation method and application thereof. The pouring sealant comprises a component A and a component B, wherein the component A is prepared from the following raw materials in parts by mass: 100 parts of vinyl-terminated polymethyl vinyl siloxane, 10 to 50 parts of simethicone, 0.05 to 1 part of a catalyst, 0.01 to 0.5 part of a thixotropicagent, 200 to 500 parts of filler and 0.1 to 2 parts of a surface treating agent; the component B is prepared from the following raw materials in parts by mass: 100 parts of vinyl-terminated polymethyl vinyl siloxane, 10 to 50 parts of simethicone, 0.05 to 1 part of cross-linking agent, 0.0005 to 0.5 part of inhibitor, 0.01 to 0.5 part of thixotropic agent, 200 to 500 parts of filler and 0.1 to 2parts of surface treating agent, wherein the content of vinyl in the vinyl-terminated polymethyl vinyl siloxane is 0.5 to 2.2 wt%. The pouring sealant provided by the invention has low viscosity andgood thixotropy.

Description

technical field [0001] The invention relates to the technical field of potting glue, in particular to a potting glue and its preparation method and application. Background technique [0002] Addition silicone rubber is a kind of synthetic rubber with very good comprehensive properties. It has the advantages of good weather resistance, high and low temperature resistance, ultraviolet resistance, air permeability, good curing and no shrinkage. Addition-type silicone rubber does not emit small molecular substances during curing, does not absorb or release heat, and the curing conditions are simple and convenient. It can be cured at room temperature or heated. Due to the many advantages of addition-type silicone rubber, addition-type silicone rubber is widely used as a potting compound in the fields of LED lamp bead packaging, potting and waterproofing of wall washers, seams of high-speed rail cars, high-voltage anti-pollution flashover insulator molding, etc. , for bonding pot...

Claims

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Application Information

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IPC IPC(8): C09J183/07C09J11/04C09J11/06C09J11/08
CPCC08K2003/2227C08K2003/282C08K2003/385C08K2201/005C08K2201/011C08K2201/014C08L2205/025C08L2205/035C09J11/04C09J11/06C09J11/08C09J183/04C08L83/04C08K13/02C08K3/38C08K3/22C08K3/28C08K13/04C08K7/26
Inventor 肖敦乾黄计锋闻明徐华斌练志良
Owner SHENZHEN XINYA NEW MATERIALS CO LTD