Thixotropic ultraviolet curing adhesive

An adhesive and ultraviolet light technology, used in adhesive additives, modified epoxy resin adhesives, non-polymer adhesive additives, etc., can solve the problem of mechanical properties decline, large structural gap, loss of thixotropic properties, etc. problem, to achieve the effect of good thixotropic performance, high bonding strength and high transparency

Active Publication Date: 2020-12-25
深圳市瑞科美宏电子科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, polyamide waxes and modified polyurea compounds have darker colors and strong absorption in the ultraviolet wavelength range, which not only affects the color of the adhesive, but also leads to a decrease in the curing efficiency of the adhesive and incomplete conversion of monomers. , the mechanical properties decrease
In addition, the structural gap between polyamide wax, modified polyurea compound and UV-curable adhesive monomer is large, resulting in limited compatibility between the two.
Organic thixotropic agents are easy to precipitate from the adhesive, forming flocculent precipitates, and lose thixotropic properties

Method used

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  • Thixotropic ultraviolet curing adhesive
  • Thixotropic ultraviolet curing adhesive
  • Thixotropic ultraviolet curing adhesive

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044]A thixotropic UV-curable adhesive, comprising the following components in parts by weight: carbonate acrylate (a carbonate with a main chain structure of 1,6-hexanediol structure, with an average molecular weight of about 3200 g / mol) 20 parts, 35 parts of divinyl bisphenol A epoxy resin (molecular weight about 440 g / mol), 42.9 parts of glycidyl methacrylate, aliphatic hyperbranched polyester (molecular weight about 500 g / mol, average terminal hydroxyl The number is 5) 3 parts, 1-hydroxycyclohexyl phenyl ketone 2 parts, antifoaming agent tego931 0.1 part, hydroquinone 0.01 part.

[0045] The viscosity of the product of Example 1 was tested with a Brookfield viscometer at a temperature of 25° C. at two rotational speeds of 1 and 10 rpm, and the thixotropic properties were calculated. Under the two conditions of rotational speed of 1 and 10 rpm, the measured viscosities were 4200 and 2900 mPa.s respectively, and the calculated thixotropic index was 1.45.

[0046] Cut a pol...

Embodiment 2

[0051] A thixotropic UV-curable adhesive, comprising the following components in parts by weight: carbonate methacrylate (carbonate whose main chain structure is a mixture of 1,6-hexanediol and 1,5-pentanediol, Average molecular weight is about 2000 g / mol) 40 parts, divinyl bisphenol F epoxy resin (molecular weight is about 400 g / mol) 10 parts, aliphatic hyperbranched polyester (molecular weight is about 1200 g / mol, average number of terminal hydroxyl groups 12) 5 parts, tetrahydrofuran acrylate 70 parts, phenylbis(2,4,6-trimethylbenzoyl) phosphine oxide 5 parts, defoamer BYK 055 0.4 parts, p-hydroxyanisole 0.02 share.

[0052] The viscosity of the product of Example 2 at 25° C. and two rotational speeds of 1 and 10 rpm was measured with a Brookfield viscometer, and the thixotropic properties were calculated. Under two conditions of rotating speeds of 1 and 10 rpm, the measured viscosities were 7900 and 4300 mPa.s respectively, and the calculated thixotropic index was 1.84. ...

Embodiment 3

[0057] A thixotropic UV-curable adhesive, comprising the following components in parts by weight: carbonate acrylate (a carbonate with a main chain structure of a mixed structure of 1,6-hexanediol and 1,4-butanediol, Average molecular weight about 2400 g / mol) 30 parts, divinyl bisphenol A type epoxy resin (molecular weight about 440 g / mol) 25 parts, cyclotrimethylolpropane formal acrylate 50 parts, aliphatic overrun 4 parts of chemical polyester (molecular weight about 800 g / mol, average number of terminal hydroxyl groups is 7), 3.5 parts of 2-benzyl-2-dimethylamino-1-(4-morpholinephenyl) butanone, 0.2 part of defoamer EFKA2720, 0.02 part of p-tert-butylcatechol, to obtain the product of Example 3.

[0058] The viscosity of the product of Example 3 at 25° C. and two rotational speeds of 1 and 10 rpm were respectively measured with a Brookfield viscometer, and the thixotropic properties were calculated. Under two conditions of rotating speeds of 1 and 10 rpm, the measured visc...

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Abstract

The invention discloses a preparation method and application of a thixotropic ultraviolet adhesive. The ultraviolet curing adhesive is prepared from the following components in parts by mass: 20-40 parts of carbonic ester (methyl) acrylate, 10-35 parts of divinyl epoxy resin, 30-70 parts of reactive monomer, 3-5 parts of hydroxyl-terminated aliphatic hyperbranched polyester, 2-5 parts of initiator, 0.1-0.6 part of defoaming agent and 0.01-0.02 part of polymerization inhibitor. The ultraviolet curing adhesive is high in transparency and good in thixotropic property (the thixotropic index is greater than 1.4), and has very high bonding strength for polycarbonate or polyethylene glycol terephthalate.

Description

technical field [0001] The invention relates to the field of ultraviolet curing adhesives, in particular to the bonding application of an ultraviolet curing adhesive with thixotropic properties in the field of polycarbonate or polyethylene terephthalate transparent plastics. Background technique [0002] Thixotropy is a physical property related to the shear history of materials, and is an important indicator for evaluating the performance of adhesives. After some neutrally charged needle-shaped (or rod-shaped) solid particles or negatively charged layered and sheet-like substances (such as kaolin, montmorillonite) are uniformly dispersed in the polymer, there will be a gap between the particles and the polymer molecules. A large number of weak bonds are formed. When the external force acts on the above-mentioned dispersion system, some weak bonds are destroyed by the external force, which shows that the viscosity of the system drops rapidly; when the external force is remo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J163/10C09J169/00C09J167/00C09J11/06
CPCC09J163/10C09J169/00C09J11/06C08L2201/10C08L2205/03C08L69/00C08L67/00C08L63/10
Inventor 郑耀臣徐汇高正国张新涛刘珂欣刘国剑张金凤
Owner 深圳市瑞科美宏电子科技有限公司
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