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Modified silane sealant for LED backlight and preparation method thereof

A technology of LED backlight source and sealant, applied in the field of sealant, can solve the problems of increased viscosity of silane-terminated polyether sealant, limited product process operation performance, poor applicability of light bar bonding, etc., and achieves good compatibility. , Avoid the thickening or even gel of the rubber compound, the effect of good process operability

Active Publication Date: 2021-07-13
GUANGDONG HENGDA NEW MATERIALS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the strength of silane-terminated polyether itself is low, which leads to certain limitations in the application under certain conditions. Generally, it is reinforced by adding a large amount of ultra-fine fillers to the sealant formula. This method makes the silane-terminated polyether seal adhesive Thickness increases, limiting the processability of the product
[0004] At present, most of the modified sealants use phthalates as plasticizers. For example, patents CN201110348463 and CN200510132669 disclose that a single-component silane modified sealing material uses phthalates. Plasticizers are very harmful to the environment and the human body, and are easy to migrate and precipitate. Gradually aging will lead to bonding failure, and the applicability of bonding light strips for LED backlight applications is poor.

Method used

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  • Modified silane sealant for LED backlight and preparation method thereof
  • Modified silane sealant for LED backlight and preparation method thereof
  • Modified silane sealant for LED backlight and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] In parts by weight, 100 parts of methyldimethoxysilyl-modified polyether, 5 parts of trimethoxysilane-terminated silane-modified polyurethane, 20 parts of cyclohexane 1,2-dicarboxylic acid di Add the isononyl ester into the mixer, stir and mix for 30 minutes at room temperature and vacuum degree of 0 MPa; add 50 parts of nano-calcium carbonate and 20 parts of alumina and stir and mix for 55 minutes; then add 2 parts of β-(3,5- Di-tert-butyl-4-hydroxyphenyl) n-octadecyl propionate, 0.5 parts of 2-[2-hydroxy-5-tert-octylphenyl)benzotriazole, 0.5 parts of bis(2,2,6 , 6-tetramethyl-4-piperidinyl) sebacate and 1 part of fumed silica were dehydrated and blended for 120 minutes at a temperature of 120°C and a vacuum of -0.08MPa; the temperature was lowered to below 50°C, and the pumping was stopped. Vacuum and stir, add 10 parts of vinyltrimethoxysilane, 5 parts of tackifier, 5 parts of bis(acetylacetonate) dibutyltin, and stir and mix for 60 minutes under the condition of vac...

Embodiment 2

[0035] In parts by weight, 100 parts of methyldimethoxysilyl-modified polyether, 80 parts of trimethoxysilane-terminated silane-modified polyurethane, 20 parts of cyclohexane 1,2-dicarboxylic acid di Add the isononyl ester into the mixer, stir and mix for 20 minutes at room temperature and vacuum degree of -0.09MPa; add 30 parts of alumina and 30 parts of silicon micropowder and stir and mix for 30 minutes; add 1 part of β-(3,5 - Di-tert-butyl-4-hydroxyphenyl) n-octadecyl propionate, 1 part of 2-[2-hydroxy-5-tert-octylphenyl) benzotriazole, 1 part of bis(2,2, 6,6-Tetramethyl-4-piperidinyl) sebacate and 5 parts of fumed silica were dehydrated and blended for 180 minutes at a temperature of 100°C and a vacuum of -0.09MPa; the temperature was lowered to below 50°C, and the process was stopped. Vacuumize and stir, add 8 parts of vinyltrimethoxysilane, 10 parts of tackifier, 3 parts of bis(acetylacetonate) dibutyltin, and stir and mix for 30 minutes under the condition of vacuum de...

Embodiment 3

[0037]In parts by weight, 100 parts of trimethoxysilyl-modified polyether, 20 parts of triethoxysilane-terminated silane-modified polyurethane, 30 parts of cyclohexane 1,2-diisononyl dicarboxylate Add the base ester into the mixer, stir and mix for 10 minutes at room temperature and vacuum degree of 0 MPa; add 30 parts of nano-calcium carbonate and 60 parts of kaolin and stir and mix for 60 minutes; add 1 part of β-(3,5-di-tert-butyl Base-4-hydroxyphenyl) n-octadecanyl propionate, 2 parts of 2-[2-hydroxy-5-tert-octylphenyl)benzotriazole, 2 parts of bis(2,2,6,6- Tetramethyl-4-piperidinyl) sebacate and 2 parts of polyamide wax were dehydrated and blended for 90 minutes at a temperature of 110°C and a vacuum of -0.1MPa; the temperature was lowered to below 50°C, and the vacuuming and stirring were stopped. Add 10 parts of vinyltrimethoxysilane, 3 parts of tackifier, and 3 parts of dibutyltin dilaurate, and stir and mix for 45 minutes under the condition of vacuum degree -0.1MPa t...

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PUM

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Abstract

The invention discloses a modified silane sealant for LED backlight, which comprises, in parts by weight, 100 parts of silane-modified polyether polymer, 5-80 parts of silane-modified polyurethane polymer, 5-50 parts of plasticized agent, 20-150 parts of filler, 0.5-2 parts of antioxidant, 0.5-2 parts of UV absorber, 0.5-2 parts of UV stabilizer, 1-5 parts of thixotropic agent, 0.5-10 parts of water remover, 1- 10 parts of tackifier, 0.5-5 parts of catalyst. The invention also discloses a preparation method of the modified silane sealant. The preparation method of the invention has simple steps and is environmentally friendly. The silane-modified sealant of the invention has excellent mechanical properties and anti-aging properties; it can be widely used in the field of liquid crystal display manufacturing of LED backlights.

Description

technical field [0001] The invention relates to the technical field of sealant, in particular to a modified silane sealant for LED backlight and a preparation method thereof. The sealant can be cured rapidly at room temperature, has good adhesion and excellent aging resistance , Used in the field of LED backlight liquid crystal display manufacturing. Background technique [0002] With the rapid development of the LED industry, the LED backlight display industry is gradually developing in the direction of safety and comfort, beautiful appearance, energy saving and environmental protection, and light weight. As an essential material for fixing and bonding LED backlight modules, sealant is used for glue for LCD screen assembly and skeleton bonding and sealing; LED TV backlight strips are bonded to backplanes and reflectors are bonded. Therefore, the development and application of high-performance sealant is extremely important; modified silane adhesive sealant for LED backligh...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09J171/02C09J175/04C09J11/04C09J11/06
CPCC08K2003/2227C08K2003/265C08K2201/011C08L2203/206C09J11/04C09J11/06C09J171/02C08L75/04C08K13/02C08K3/26C08K5/36C08K3/22C08K5/12
Inventor 黄华叶发德龙正宇周为民
Owner GUANGDONG HENGDA NEW MATERIALS TECH
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