WO2020140856A1 - High refractive index silica gel for full lamination of liquid crystal display screen - Google Patents

Abstract

A high refractive index silica gel for full lamination of a liquid crystal display screen. The high refractive index silica gel for the full lamination of the liquid crystal display screen comprises a component A and a component B, wherein the component A comprises the following raw materials in parts by weight: 50-60 parts of a methyl phenyl vinyl silicone resin, 35-50 parts of methyl phenyl vinyl silicone oil, and 0.1-0.3 part of a platinum group catalyst; and the component B comprises the following raw materials in parts by weight: 20-30 parts of POSS modified hydrogen-containing silicone oil having functions of a cross-linking agent and a bonding agent, 30-50 parts of a methyl phenyl vinyl silicone resin, 20-30 parts of methyl phenyl vinyl silicone oil, and 0.1-0.3 part of an inhibitor. The light transmittance of the silica gel for the full lamination of the liquid crystal display screen is improved, the difference in refractive index among lamination media is reduced, the display effect of the liquid crystal display screen is improved, and moreover, the heat resistance of the materials is improved by means of introduction of phenyl groups.

Description

High-refractive-index silicone for full-fitting of LCD screen Technical field

The invention relates to a high-refractive-silica gel for full lamination of liquid crystal display screens, in particular to a high-refractive-index silica gel with high strength, excellent heat resistance and excellent adhesion to substrates, and belongs to the technical field of adhesive materials.

Background technique

At present, as liquid crystal displays are widely used in the fields of computers, televisions, mobile phones and automobiles, the reliability of the filler material used for the screen plays a key role in the performance of the liquid crystal displays. The traditional materials used for touch screen filling mainly include unsaturated polyesters, acrylic resins, polyurethanes and epoxy resins. Due to the low temperature resistance of the above materials, they are easy to crack, high cure shrinkage and yellow. Changes and other shortcomings will be limited in the actual application process.

Addition-molded optically transparent silicone resin has the characteristics of no by-products in the reaction process, low shrinkage, adjustable cross-linking density and controllable curing speed, etc. It can not only play a role in moisture resistance, radiation resistance and weather resistance, but also has excellent electrical properties , Chemical stability and good optical properties. At present, the general-purpose silicone for full LCD bonding on the market is a low refractive index methyl silicone oil/silicone resin, and there is no material with high refractive index, so it is necessary to design a high refractive index silicone for full bonding of LCD screens. .

Summary of the invention

An object of the present invention is to provide a high-refractive-silica gel for full lamination of liquid crystal display screens.

In order to achieve the above object and other related objects, the technical solution provided by the present invention is: a high-refractive-index silicone for full-fitting of LCD screens, characterized in that the high-refractive-silicone silicone for full-fitting of LCD screens includes a group Points A and B; where,

The raw material formula of the component A includes the following parts by weight of raw materials:

Methyl phenyl vinyl silicone resin 50~60 copies;

Methyl phenyl vinyl silicone oil 35-50 copies;

Platinum catalysts 0.1～0.3 copies of the catalysts;

The component B includes the following parts by weight of raw materials:

The preferred technical solution is: the mass ratio of the component A to the component B is 1: 0.8-1.2.

A preferred technical solution is that the platinum-based catalyst is at least one of a platinum-methylphenyl polysiloxane complex and a platinum-olefin complex.

A preferred technical solution is: the platinum catalyst is a platinum-methylphenyl polysiloxane complex, and the platinum content is 3000-7000 ppm.

A preferred technical solution is that the inhibitor is at least one of ethynylcyclohexanol and 1,1,3-triphenyl-2-propyn-1-ol.

The preferred technical solution is: the inhibitor is preferably 1,1,3-triphenyl-2-propyn-1-ol.

The preferred technical solution is that the POSS-modified silicone oil containing both the functions of a cross-linking agent and an adhesive is a compound conforming to structural formula (1) or structural formula (2):

In the formula, R is

R'is -CH ₂ CH ₂ Si(OMe) ₃ and Me is methyl.

Due to the application of the above technical solutions, the present invention has the following advantages over the prior art:

1. The high-refractive-silica gel used for full lamination of the liquid crystal display of the present invention, the introduction of phenyl can increase the refractive index of the material, reduce the difference of the refractive index between the bonding media, and effectively improve the display effect of the liquid crystal display; On the one hand, the introduction of phenyl groups can improve the heat resistance of the material.

2. The silica gel for full lamination of the high-refractive-index liquid crystal screen of the present invention is composed of components A and B. Component A provides a resin, vinyl, catalyst and adhesive that increase strength during the reaction, and component B provides an improved Silicone oil, vinyl group and inhibitor containing POSS structure with cross-linking agent and adhesive which have both cross-linking agent and adhesive, the high-refractive-index LED encapsulating silica gel of this invention, in addition to methyl phenyl vinyl silicone resin In addition, the addition of OSS-modified silicone oil containing 6 silicon hydrogen and 2 alkoxy groups containing hydrogen as both a cross-linking agent and an adhesive improves both the cross-linking density and the adhesion to the substrate And heat resistance.

detailed description

The following describes the implementation of the present invention by specific specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention by the contents disclosed in this example.

The terminology used herein is for the purpose of illustrating particular embodiments only, and is not intended to limit the invention. Unless the context clearly indicates otherwise, the singular forms "a" and "an" as used herein also include the plural forms.

In describing the preferred embodiments, special terminology may be used for the purpose of clarity; however, those disclosed in this specification are not intended to be limited to the particular terminology selected; and it should be understood that each specific element includes the same All equivalent technologies that function, operate in a similar manner, and achieve similar effects.

Example 1: A high-refractive-silica gel for full-fitting of LCD screens

Component A: Weigh 50g of methyl phenyl vinyl silicone resin, 49.9g of methyl phenyl vinyl silicone oil, 0.1g of platinum-methyl phenyl polysiloxane complex, platinum content of 5000ppm, and then add and stir Uniform, that is, the A component;

Component B: Weigh 25g of POSS-modified silicone oil (structure formula (1)) containing hydrogen as a crosslinking agent and an adhesive, 40g of methylphenyl vinyl silicone resin, and 24.9 of methylphenyl vinyl silicone oil g, the inhibitor 1,1,3-triphenyl-2-propyn-1-ol 0.1g, added in turn to mix and stir well, that is to obtain the component B. The structural formula (1) is as follows:

In the formula, R is

R'is -CH ₂ CH ₂ Si(OMe) ₃ and Me is methyl.

POSS modified hydrogen-containing silicone oil with the function of crosslinking agent and adhesive as a modified POSS, is a crosslinking agent containing 6 silicon hydrogen to participate in the crosslinking reaction, and contains alkoxy groups, which can improve the reactant Adhesion to the substrate, and excellent compatibility with other components, high light transmittance.

The molecular formula of the methylphenylvinyl silicone oil is: ViMePhSiO _1/2 , where Me is a methyl group, Vi is a vinyl group, and Ph is a phenyl group. The addition of methyl phenyl vinyl silicone oil provides phenyl that can increase the refractive index, vinyl that can participate in the reaction, and reduces the viscosity of the system.

When in use, mix the components A and B uniformly according to the weight ratio of 1:1, vacuum degassing for 20 minutes, pouring glue on the backlight module or cover plate, and heating at 70 ℃ for 1 hour , Then heated at 80 ℃ for 4 hours.

Preparation method of high-refractive-silica gel for full lamination of liquid crystal display: the above composition is mixed in a stainless steel, enamel or glass container according to the proportion, and then filtered and filled in the packaging container of the specified specification. In this embodiment, by using high-refractive-index phenyl silicone oil/silicone resin for the full-bonding of the LCD screen, the light transmittance is improved, the difference in the refractive index between the bonding media is reduced, and the display effect of the LCD screen is effectively improved At the same time, the introduction of phenyl groups can improve the heat resistance of the material.

Example 2: A high-refractive-silica gel for full lamination of LCD screens

Component A: Weigh 50g of methyl phenyl vinyl silicone resin, 49.9g of methyl phenyl vinyl silicone oil, 0.1g of platinum-methyl phenyl polysiloxane complex, platinum content of 5000ppm, and then add and stir Uniform, that is, the A component;

Component B: Weigh the above-mentioned silicone-containing alkoxy-containing POSS modified silicone oil (structure formula (1)) 20g, methyl phenyl vinyl silicone resin 30g, methyl phenyl vinyl silicone oil 20g, inhibitor 1,1 , 3-triphenyl-2-propyn-1-ol 0.1g, add the mixture in turn and mix well, then get the component B;

When in use, mix the components A and B uniformly according to the weight ratio of 1:0.8, vacuum degassing for 20 minutes, pouring glue on the backlight module or cover plate, and heating at 70 ℃ for 1 hour , Then heated at 80 ℃ for 4 hours.

Example 3: A high-refractive-index silicone for full-fitting of LCD screens

Component A: Weigh 50g of methyl phenyl vinyl silicone resin, 49.9g of methyl phenyl vinyl silicone oil, 0.1g of platinum-methyl phenyl polysiloxane complex, platinum content of 5000ppm, and then add and stir Uniform, that is, the A component;

Component B: Weigh 30g of the above-mentioned silicon-hydrogen and alkoxy-containing POSS modified silicone oil (structure formula (1)), methylphenyl vinyl silicone resin 50g, methylphenyl vinyl silicone oil 19.9g, inhibitor 1, 1,3-triphenyl-2-propyn-1-ol 0.1g, add them in sequence and mix well to obtain the component B;

Comparative Example 1

Component A: Weigh 50g of methyl phenyl vinyl silicone resin, 49.9g of methyl phenyl vinyl silicone oil, 0.1g of platinum-methyl phenyl polysiloxane complex, platinum content of 5000ppm, and then add and stir Uniform, that is, the A component;

Component B: Weigh 25g of methyl phenyl hydrogen silicone oil, 40g of methyl phenyl vinyl silicone resin, 34.9g of methyl phenyl vinyl silicone oil, inhibitor 1,1,3-triphenyl-2-propane 0.1g of alkyn-1-ol, add the mixture in turn and stir evenly to obtain the component B;

Comparative Example 2

Component A: Weigh 50g of methyl vinyl silicone resin, 49.9g of methyl vinyl silicone oil, 0.1g of catalyst platinum-methyl polysiloxane complex, platinum content of 5000ppm, then add and mix in order, then obtain Component A

Component B: Weigh 25g of POSS modified silicone oil (structure formula 2) containing no alkoxy groups and only 40g of methyl vinyl silicone resin, 34.9g of methyl vinyl silicone oil, and 1,1,3-three inhibitors Phenyl-2-propyn-1-ol 0.1g, add it in turn and mix well to obtain the component B;

Weigh the A and B components of Examples 1, 2, 3 and Comparative Examples 1, 2 at a weight ratio of 1:1, then mix evenly, degassing for 20 minutes, according to GB/T7124-2008 adhesive tensile shear The shear strength requires the production of 45# steel test pieces; curing conditions: first heat at 70 ℃ for 1 hour, and then heat at 80 ℃ for 4 hours. Test one: Use the tensile machine to test the shear strength of the test piece. The test method is according to GB/T7124-2008.

Table 1 Performance Index Table

It can be seen from the comparison of the shear strength of Examples 1, 2, 3 in Table 1 and Comparative Examples 1 and 2 that the direct introduction of alkoxy groups improves the shear strength, that is, improves the adhesion to the substrate; In the light transmittance test, it can be seen from Examples 1, 2, 3, and Comparative Example 2 that the introduction of the phenyl group structure into the formulation significantly improves the light transmittance.

Example 4: A high-refractive-silica gel for full-fitting of LCD screen

A high-refractive-index silicone for full lamination of liquid crystal display, which includes component A and component B; wherein,

The raw material formula of the component A includes the following parts by weight of raw materials:

Methyl phenyl vinyl silicone resin 51 copies;

Methyl phenyl vinyl silicone oil 40 copies;

Platinum-based catalyst 0.2 copies;

The component B includes the following parts by weight of raw materials:

A preferred embodiment is: the mass ratio of component A to component B is 1:0.8.

A preferred embodiment is that the platinum catalyst is a platinum-olefin complex. The platinum content is 4000 ppm.

A preferred embodiment is that the inhibitor is ethynylcyclohexanol.

A preferred embodiment is that the POSS-modified silicone oil containing both the functions of a crosslinking agent and an adhesive is a compound of structural formula (2):

In the formula, R is

R'is -CH ₂ CH ₂ Si(OMe) ₃ and Me is methyl.

Example 5: High-refractive index silicone for full-fitting of LCD screen

A high-refractive-index silicone for full lamination of liquid crystal display screens, characterized in that the high-refractive-index silicone rubber for full lamination of liquid crystal display screens includes component A and component B; wherein,

The raw material formula of the component A includes the following parts by weight of raw materials:

Methyl phenyl vinyl silicone resin 58 copies;

Methyl phenyl vinyl silicone oil 48 copies;

Platinum-based catalysts 0.3 copies;

The component B includes the following parts by weight of raw materials:

A preferred embodiment is: the mass ratio of the component A to the component B is 1:1.2.

A preferred embodiment is that the platinum-based catalyst is a mixture composed of a platinum-methylphenyl polysiloxane complex and a platinum-olefin complex in a mass ratio of 1:1. The platinum content is 6000 ppm.

A preferred embodiment is that the inhibitor is a mixture of ethynylcyclohexanol and 1,1,3-triphenyl-2-propyn-1-ol in a mass ratio of 1:5.

A preferred embodiment is that the POSS-modified silicone oil containing both the functions of a crosslinking agent and an adhesive is a compound conforming to structural formula (2):

In the formula, R is

R'is -CH ₂ CH ₂ Si(OMe) ₃ and Me is methyl.

Example 6: A high-refractive-index silicone for full-fitting of LCD screens

A high-refractive-index silicone for full lamination of liquid crystal display screens, characterized in that the high-refractive-index silicone rubber for full lamination of liquid crystal display screens includes component A and component B; wherein,

The raw material formula of the component A includes the following parts by weight of raw materials:

Methyl phenyl vinyl silicone resin 55 copies;

Methyl phenyl vinyl silicone oil 40 copies;

Platinum-based catalyst 0.2 copies;

The component B includes the following parts by weight of raw materials:

A preferred embodiment is: the mass ratio of the component A to the component B is 1:1.

A preferred embodiment is that the platinum-based catalyst is a platinum-methylphenyl polysiloxane complex, and the platinum content is 5000 ppm.

A preferred embodiment is: the inhibitor is preferably 1,1,3-triphenyl-2-propyn-1-ol.

A preferred embodiment is that the POSS-modified silicone oil containing both the functions of a crosslinking agent and an adhesive is a compound conforming to structural formula (2):

In the formula, R is

R'is -CH ₂ CH ₂ Si(OMe) ₃ and Me is methyl.

The above are only for explaining the preferred embodiments of the present invention, and are not intended to limit the present invention in any form, so any modifications or changes made to the present invention under the same spirit of the invention , Should still be included in the scope of protection of the present invention.

Claims (7)

1. A high-refractive-index silicone for full lamination of liquid crystal display screens, characterized in that the high-refractive-index silicone rubber for full lamination of liquid crystal display screens includes component A and component B; wherein,

   The raw material formula of the component A includes the following parts by weight of raw materials:

   Methyl phenyl vinyl silicone resin 50~60 copies;

   Methyl phenyl vinyl silicone oil 35-50 copies;

   Platinum catalysts 0.1～0.3 copies of the catalysts;

   The component B includes the following parts by weight of raw materials:

   
2. The high refractive index silica gel for full lamination of liquid crystal display panels according to claim 1, characterized in that the mass ratio of the component A to the component B is 1: 0.8-1.2.
3. The high-refractive index silica gel for full bonding of liquid crystal display panels according to claim 1, wherein the platinum-based catalyst is at least one of a platinum-methylphenyl polysiloxane complex and a platinum-olefin complex One kind.
4. The high refractive index silica gel for full lamination of liquid crystal displays according to claim 3, wherein the platinum-based catalyst is a platinum-methylphenyl polysiloxane complex, and the platinum content is 3000-7000 ppm.
5. The high refractive index silica gel for full lamination of liquid crystal displays according to claim 1, wherein the inhibitor is ethynylcyclohexanol, 1,1,3-triphenyl-2-propyne-1 -At least one of alcohols.
6. The high refractive index silica gel for full lamination of liquid crystal display panels according to claim 5, wherein the inhibitor is preferably 1,1,3-triphenyl-2-propyn-1-ol.
7. The high-refractive-silica gel silicone for full lamination of liquid crystal displays according to claim 1, characterized in that the POSS-modified silicone oil containing hydrogen as both a cross-linking agent and an adhesive agent conforms to structural formula (1) or Compound of formula (2):

   

   In the formula, R is

   

   R'is -CH ₂ CH ₂ Si(OMe) ₃ and Me is methyl.