Liquid crystal sealant composition

A technology of liquid crystal sealant and liquid crystal sealing, which is applied in the direction of adhesives, adhesive types, modified epoxy resin adhesives, etc., can solve the problems of reducing initiator reactivity, orientation disorder, and negative effects of liquid crystals, etc., to achieve increased The effects of sealing and reliability, excellent bonding performance, and convenient performance adjustment

Active Publication Date: 2012-06-27
DONGGUAN POWERBOND NEW MATERIALS TECH DEV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This production method has the following defects: dislocation due to hot pressing and uneven gap, damage to the adhesive strength of the sealant and the substrate; foam formed by thermal expansion of the remaining solvent causes uneven gap and displacement of the sealant; curing sealant requires It takes a long time; the pre-baking process is very complicated; because the volatilization of the solvent makes the available time of the sealant very short, it takes a long time to inject the liquid crystal, etc.
[0006] In recent years, due to the implementation of energy saving and consumption reduction, the industry tends to low-voltage liquid crystal display devices (low-voltage liquid crystals). Low-voltage liquid crystals are very easy to absorb impurities. Over time, it is easy to form high dielectric Electrical anisotropy, which is easy to cause orientation disorder and reduce voltage retention rate, that is: due to the absorption of uncured photoinitiator and thermal curing agent, ionized compound, silane coupling agent, etc., it will cause liquid crystal orientation disorder and voltage over time Lower retention rate etc.
[0007] For this reason, people have been studying countermeasures, such as reducing the amount of initiator used in the system or using a polymer initiator to reduce the extraction of the liquid crystal to the initiator, but these behaviors not only cannot fully inhibit the liquid crystal from eluting the initiator, It also leads to insufficient curing of the reaction system or reduces the reactivity of the initiator, resulting in higher curing conditions, which will have a negative impact on liquid crystals
[0008] In addition, as for ionic impurities, it has been reported that the sealing agent, end-capping

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0051] 1: Synthesis of carboxy-terminated hyperbranched silicone modified polyester (HP)

[0052] The theoretically calculated amount of (trimellitic anhydride) TMA and dialkylhydroxypolyphenylsilane (DHPS) (n(TMA): n(DHPS)=22:21) is added to the four ports with agitator, temperature control device and water separator Into the flask, add xylene and esterification catalyst, raise the temperature to 140° C. and react for 5 hours, and distill off the solvent to obtain a carboxy-terminated hyperbranched organosilicon modified polyester with an acid value of 224.02 mgKOH / g pale yellow solid.

[0053] 2: Synthesis of acrylic modified hyperbranched silicone epoxy resin (HPS-1)

[0054] The carboxyl-terminated hyperbranched silicone-modified polyester and epichlorohydrin synthesized in Example 1 were added to the reaction device at a ratio of carboxyl to epichlorohydrin of 1:2, and then an appropriate amount was added The phase transfer catalyst is heated to 110~120℃ and reacted for 2h. Aft...

Embodiment 2

[0065] 1: Synthesis of carboxy-terminated hyperbranched silicone modified polyester (HP)

[0066] The theoretically calculated amount of (trimellitic anhydride) TMA and dialkylhydroxypolyphenylsilane (DHPS) (n(TMA): n(DHPS)=22:21) is added to the four ports with agitator, temperature control device and water separator Into the flask, add xylene and esterification catalyst, raise the temperature to 140° C. and react for 5 hours, and distill off the solvent to obtain a carboxy-terminated hyperbranched organosilicon modified polyester with an acid value of 224.02 mgKOH / g pale yellow solid.

[0067] 2: Synthesis of acrylic modified hyperbranched silicone epoxy resin (HPS-2)

[0068] Add a certain amount of dialkylhydroxypolyphenylsilane to a four-necked flask equipped with a stirrer, thermometer, condenser, nitrogen tube and constant pressure funnel. Under normal temperature and stirring conditions, slowly from the constant pressure funnel Drop the IPDI trimer in the amount of 1:1. Afte...

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Abstract

The invention provides a liquid crystal sealant composition, which is an ultraviolet/thermal dual curable resin composition for sealing liquid crystal by a one drop fill (ODF) process, and comprises the following components in parts by weight: 40-80 parts of acrylic acid modified hyperbranched organosilicon epoxy resin, 2-15 parts of grafted hyperbranched epoxy resin coupling agent, 0.5-8 parts of photoinitiator, 5-25 parts of latent epoxy resin curing agent, and 5-40 parts of filler. The inventive composition has good coating operability and high bonding strength, solves the problem of contamination to liquid crystal existing in the conventional sealing material, and increases the bonding strength between a substrate and cured liquid crystal sealant, thus a liquid crystal display panel with high display performance and excellent quality can be manufactured, and the production efficiency is greatly improved.

Description

Technical field [0001] The present invention relates to the technical field of liquid crystal display panel packaging, in particular, to a liquid crystal sealing compound composition. Background technique [0002] In recent years, with the advancement of broadband and the development of small electronic devices such as digital cameras and mobile phones, the demand for liquid crystal display panels as flat panel display devices has rapidly expanded in terms of thinness, light weight, and low power consumption. [0003] The LCD panel is mainly manufactured by the liquid crystal injection method. There are two methods for the liquid crystal display packaging process. One is the vacuum suction method, that is, screen printing is used on an IT0 quartz glass plate with etched TFT transistors and printed alignment film. Make a rectangular pattern with a liquid crystal suction port, and then pre-baked at 60-100 ℃, dry the solvent in the sealant, and then drop a spacer into it, press and al...

Claims

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Application Information

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IPC IPC(8): C09J163/10C09J163/00G02F1/1339
Inventor 黄战光杜学锋吴国飞刘兆辉揭志强张小中
Owner DONGGUAN POWERBOND NEW MATERIALS TECH DEV
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