Yellowing resistant bi-component room-temperature curing transparent epoxy glue and preparation method thereof

A room temperature curing, two-component technology, applied in the field of polymer chemistry, can solve the problems of being unable to meet the requirements of outdoor nixie tube potting, poor yellowing resistance, and low time-consuming efficiency, and achieve high resistance to UV aging yellowing, resistance High heat aging yellowing and prolonging the service life

Inactive Publication Date: 2018-07-20
广州惠利电子材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The encapsulation glue used in outdoor digital tube advertising light-emitting signs is mainly epoxy resin glue. Traditionally, those with better yellowing resistance use heated acid anhydride type two-component transparent epoxy glue, and the heating and curing conditions are 70 ℃-90℃ / 2h+90℃-110℃ / 6-8h, time-consuming, low efficiency and high production cost. At the same time, with the increase of the size of the digital tube advertising luminous nameplate, it is easy to have the problem of curing warp, even when the size is too large, There is a certain degree of difficulty in production for the problem of heating, baking and curing
[0003] Although the traditional two-component room temperature curing epoxy adhesive improves the temperature of the rocker and curing conditions, it has poor yellowing resistance and cannot meet the requirements of outdoor digital tube potting

Method used

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  • Yellowing resistant bi-component room-temperature curing transparent epoxy glue and preparation method thereof
  • Yellowing resistant bi-component room-temperature curing transparent epoxy glue and preparation method thereof
  • Yellowing resistant bi-component room-temperature curing transparent epoxy glue and preparation method thereof

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preparation example Construction

[0041] The specific scheme is as follows: a preparation method of two-component room temperature curing transparent epoxy adhesive, comprising

[0042] Steps for preparing composition A: Preheat the epoxy resin according to the formula quantity, then add defoaming additives, antioxidants and benzyl alcohol into the preheated epoxy resin according to the formula quantity, mix evenly with a high-speed dispersing mixer, and vacuumize , filtered to obtain composition A;

[0043]Steps for preparing composition B: add epoxy resin anti-yellowing agent into curing agent according to the formula amount, mix evenly with a high-speed dispersing mixer, and filter to obtain composition B;

[0044] Mixing step: when in use, mix the above-mentioned composition A and composition B according to the mass ratio of 2:1.

[0045] In the above preparation method, since the epoxy resin is easily oxidized to generate carbonyl to form a yellowing group, the ability of the antioxidant to decompose the...

Embodiment 1

[0050] A two-component room temperature curing transparent epoxy adhesive is prepared by the following method,

[0051] Steps for preparing composition A: Weigh 88.5g of bisphenol A epoxy resin, preheat at 80°C for 30 minutes, then add 4g of polyphenylene phosphite antioxidant, defoaming copolymer and polysiloxane solvent After mixing 0.5 g and 7 g of benzyl alcohol, they were uniformly dispersed by a high-speed dispersing mixer at 20,000 rpm for 30 minutes, then vacuumed for 10 minutes to break the foam, and filtered through a 160-mesh filter to obtain composition A.

[0052] Steps for preparing composition B: Weigh 99g of modified alicyclic amine curing agent, add 1g of epoxy resin anti-yellowing agent, mix and disperse evenly through a high-speed dispersing mixer at 20,000 rpm for 30 minutes, and pass through a 160-mesh filter Composition B was prepared by filtration.

[0053] Mixing step: when in use, mix the above-mentioned composition A and composition B according to a ...

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Abstract

The invention discloses yellowing resistant bi-component room-temperature curing transparent epoxy glue. The epoxy glue consists of a composition A and a composition B, wherein the composition A and the composition B are mixed in proportion at the mass ratio of 2 to 1; the composition A consists of the following components in percentages by weight: 88.0% to 92.0% of epoxy resin, 0.3% to 1.0% of adefoaming additive, 4.0% to 6.0% of an antioxidant and 3.0% to 7.0% of benzyl alcohol; and the composition B consists of the following components in percentages by weight: 99.0% to 99.5% of a curing agent and 0.5% to 1.0% of an epoxy resin yellowing resistant agent. The invention also discloses a preparation method of the yellowing resistant bi-component room-temperature curing transparent epoxy glue. The yellowing resistance of the epoxy glue can be improved effectively, the problem that a plate becomes warped by curing when a digital tube advertisement light-emitting word plate is manufactured is avoided, and the service life of the digital tube advertisement light-emitting word plate is prolonged more effectively.

Description

technical field [0001] The invention relates to the technical field of macromolecular chemistry, and more specifically relates to a yellowing-resistant two-component room temperature curing transparent epoxy adhesive and a preparation method thereof. Background technique [0002] The encapsulation glue used in outdoor digital tube advertising light-emitting signs is mainly epoxy resin glue. Traditionally, those with better yellowing resistance use heated acid anhydride type two-component transparent epoxy glue, and the heating and curing conditions are 70 ℃-90℃ / 2h+90℃-110℃ / 6-8h, time-consuming, low efficiency and high production cost. At the same time, with the increase of the size of the digital tube advertising luminous nameplate, it is easy to have the problem of curing warp, even when the size is too large, There is a certain degree of difficulty in production for the problem of heating, baking and curing. [0003] Although the traditional two-component room temperature...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J163/00C09J11/08C09J11/06C08G59/50
CPCC08G59/5026C08L2201/08C08L2201/10C08L2205/03C09J11/06C09J11/08C09J163/00C08L85/02C08L83/04C08K5/005
Inventor 尹彬黄仁杰郑长利
Owner 广州惠利电子材料有限公司
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