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Latent single-component LCD (liquid crystal display) packaging adhesive

A latent, one-component technology, applied in the direction of adhesives, epoxy resin glue, adhesive types, etc., can solve the problems of poor compatibility between curing agent and substrate, reduce large-scale production, troublesome use, etc., and achieve saturated water absorption Low rate, good latency, and the effect of preventing cracking

Inactive Publication Date: 2013-08-21
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In general, LCD adhesives are required to have the characteristics of high bonding strength, fast curing, no yellowing, and good flexibility. Almost all LCD adhesives sold on the market can meet these properties, but most of them are double-sided adhesives. One-component epoxy adhesive is very troublesome to use; or it is a one-component epoxy adhesive, but the compatibility between the curing agent and the substrate is poor, or it has the disadvantages of short pot life and difficult storage, which greatly reduces the Possibility of mass production

Method used

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  • Latent single-component LCD (liquid crystal display) packaging adhesive

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] (1) Take 1 mol of dicyandiamide and 1 mol of formaldehyde, adjust the pH of the system to 9 with NaOH solution, and then heat it to 80°C to react until the formaldehyde content of the system is lower than 3%; then add 0.9 mol of propylene oxide, Heat the reaction at 130°C for 3h, and distill off low molecular weight substances at 70°C under reduced pressure to obtain a latent liquid curing agent for use.

[0026] The infrared spectrogram (IR) of the latent liquid curing agent that makes is as figure 1 shown, from figure 1 It can be seen that the prepared latent liquid curing agent is at 1064cm ‐1 -1384cm ‐1 There are many characteristic absorption peaks between, and at 3000cm ‐1 -3250cm ‐1 There are characteristic peaks, indicating that the reaction generates ‐OH; at 2976cm ‐1 Appeared near-CH3 characteristic absorption peak, explained the introduction of methyl group in the modified dicyandiamide after reaction; ‐1 NH at 2 The doublet becomes only at 3349cm in t...

Embodiment 2

[0032] (1) Take 1 mol of dicyandiamide and 1.2 mol of formaldehyde, adjust the pH of the system to 9.5 with triethanolamine solution, and then heat to 75°C to react until the formaldehyde content of the system is lower than 3%; then add 1.3 mol of propylene oxide, Heat the reaction at 110°C for 5h, and distill off low molecular weight substances under reduced pressure at 80°C to obtain a latent liquid curing agent for use.

[0033] (2), based on the percentage of the total mass of raw materials, weigh E-44 epoxy resin accounting for 60% of the total mass of raw materials, 12% random carboxylated nitrile rubber, 15% self-made curing agent, and 1% KH- 560 silane coupling agent, 1% of KH‐570 silane coupling agent, 1% of DMF were added to a 500ml beaker, stirred evenly with a glass to obtain mixture A;

[0034] (3), then take 0.2% of the total mass of raw materials BYK‐066N defoamer, 0.1% of KLE‐42 leveling agent, 0.2% of BYK‐110 wetting and dispersing agent, 12% of calcium carbon...

Embodiment 3

[0037](1) Take 1 mol of dicyandiamide and 1.1 mol of formaldehyde, adjust the pH of the system to 10 with NaOH solution and dimethylethanolamine solution, heat to 80°C for reaction, and wait until the formaldehyde content of the system is lower than 3%; then add 1.0 mol propylene oxide, heated at 120°C for 4 hours, and distilled off low molecular weight substances at 80°C under reduced pressure to obtain a latent liquid curing agent for use.

[0038] (2), based on the percentage of the total mass of raw materials, take by weighing E-44 epoxy resin accounting for 69% of the total mass of raw materials, 5 parts of random carboxylated nitrile rubber, 3% carboxyl-terminated nitrile rubber, 11% of homemade Curing agent, 1% KH‐550 silane coupling agent, 0.5% DMF, added to a 500ml beaker, stirred evenly with a glass to obtain mixture A;

[0039] (3), then take 0.3% of the total mass of raw materials BYK-066N defoamer, 0.1% of TG-440 leveling agent, 0.1% of BYK-110 wetting and dispers...

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Abstract

The invention discloses a latent single-component LCD (liquid crystal display) packaging adhesive which comprises the following raw materials in percentage by mass: 51-70% of epoxy resin E-44, 8-15% of epoxy resin modifier, 10-15% of latent liquid curing agent, 1-5% of silane coupling agent, 0.5-5% of solvent, 0.1-0.5% of defoaming agent, 0.1-0.5% of leveling agent, 0.1-0.5% of wetting dispersant, 10-15% of calcium carbonate and 0.1-2% of titanium white. The preparation method comprises the following steps: uniformly stirring epoxy resin E-44, epoxy resin modifier, curing agent, silane coupling agent and solvent; and adding the remaining raw materials, uniformly stirring, and standing at normal temperature to remove bubble. The LCD packaging adhesive can be cured at 120-150 DEG C to perform LCD binding, and has the characteristics of no yellowing, high binding strength, favorable light transmittance, low curing shrinkage rate, long storage life and the like.

Description

technical field [0001] The invention relates to an adhesive, in particular to an LCD packaging adhesive, in particular to a latent one-component LCD packaging adhesive, which belongs to the field of epoxy adhesives. Background technique [0002] Epoxy resin is one of the important matrix resins of composite materials, which endows composite materials with good mechanical properties and process properties, and is widely used in many fields. The adhesive is made of epoxy resin, which has the advantages of excellent bonding performance, mechanical properties and easy processing and molding. As a widely used electronic product, LCD has been closely related to people's daily life. Therefore, the quality of LCD performance is extremely important. Generally speaking, in addition to excellent display performance, LCD is also required to have the characteristics of durability and good fixing performance, which are inseparable from the adhesive used. The quality of adhesion determi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J163/02C09J11/08
Inventor 涂伟萍吴忠喜王峰
Owner SOUTH CHINA UNIV OF TECH
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