A kind of near-infrared curing polyurethane acrylate adhesive

A polyurethane acrylate, hyperbranched polyurethane technology, applied in the direction of polyurea/polyurethane adhesives, adhesives, adhesive types, etc., can solve the problems of low viscosity, difficult curing, limited UV curing depth, etc. The effect of viscosity, low viscosity and high depth of cure

Active Publication Date: 2022-02-01
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the depth of UV curing is limited and it is difficult to cure colored systems. At present, colored adhesives are often used in fields such as chip security, integrated circuit chip sealing, IC encapsulation, and reinforcement of electronic circuits, but UV curing cannot meet the requirements. need
[0003] Urethane acrylate is often used as the main resin of the adhesive, but it will increase the viscosity of the system in the near-infrared system, thereby affecting the performance of the adhesive. Therefore, it is necessary to study a low-viscosity, fast-curing colored adhesive

Method used

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  • A kind of near-infrared curing polyurethane acrylate adhesive
  • A kind of near-infrared curing polyurethane acrylate adhesive
  • A kind of near-infrared curing polyurethane acrylate adhesive

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] The preparation of embodiment 1 hyperbranched polyurethane acrylate

[0030] S1 Mix 55.55g of isophorone diisocyanate and 55.55g of N,N-dimethylacetamide solution, and when the solution is cooled to 0°C, slowly add 26.28g of diethanolamine and 26.28g of N,N-dimethylacetamide Solution, react at 0°C for 2 hours after dropping; slowly raise the temperature to 50°C, and measure the NCO content every 20 minutes. When the measured NCO content is close to the theoretical value of 6%, add excess amino silicone oil, and finally use The hyperbranched polyurethane with 2 terminal hydroxyl groups was obtained after sedimentation separation with anhydrous ether and vacuum drying. Hydroxyl value determined by acetic anhydride-pyridine titration.

[0031] S2 At 60°C, under nitrogen, add 55.55g of isophorone diisocyanate and 55.55g of N,N-dimethylacetamide solution, slowly drop 25g of polyethylene glycol 200 and 25g of N,N-dimethylacetamide solution, when the NCO value reaches 50% of...

Embodiment 2

[0034] Embodiment 2 near-infrared curing polyurethane acrylate adhesive

[0035] Prepare according to the content of the substances in Table 1 and mix evenly under dark conditions to obtain Adhesive-1.

[0036] Table 1 Adhesive-1 formulation

[0037]

[0038] Coat the adhesive-1 on the organic plastic sheet, cover with another organic plastic sheet, control the thickness at 2mm, and irradiate it under near-infrared light.

Embodiment 3

[0039] Embodiment 3 near-infrared curing polyurethane acrylate adhesive

[0040] Prepare according to the content of the substances in Table 2 and mix evenly under dark conditions to obtain Adhesive-2.

[0041] Table 2 Adhesive-2 formulation

[0042] substance content urethane acrylate 50wt% hyperbranched urethane acrylate 30wt% trimethylolpropane triacrylate 10wt% Irgacure-784 (bis 2,6-difluoro-3-pyrrolephenyl titanocene) 3wt% β-NaYF4:18%Yb,0.5%Tm 6wt% carbon black 1wt%

[0043] Coat the adhesive-1 on the organic plastic sheet, cover with another organic plastic sheet, control the thickness at 2mm, and irradiate it under near-infrared light.

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Abstract

The invention relates to a near-infrared curing polyurethane acrylate adhesive, which belongs to the field of adhesives. The components of the near infrared curing urethane acrylate adhesive include: urethane acrylate resin, hyperbranched urethane acrylate, active diluent, photoinitiator, and up-conversion nanoparticles. The adhesive has the advantages of high curing depth; the system also has the advantages of low viscosity and increased curing speed, and the technology can realize the curing of colored systems.

Description

technical field [0001] The invention relates to a near-infrared curing polyurethane acrylate adhesive, which belongs to the field of adhesives. Background technique [0002] Light-curing technology has the advantages of fast curing, energy saving, and greenness. Light-curing adhesives are widely used in medical care, electronic components and daily life. However, the depth of UV curing is limited and it is difficult to cure colored systems. At present, colored adhesives are often used in fields such as chip security, integrated circuit chip sealing, IC encapsulation, and reinforcement of electronic circuits, but UV curing cannot meet the requirements. need. [0003] Urethane acrylate is often used as the main resin of the adhesive, but it will increase the viscosity of the system in the near-infrared system, thereby affecting the performance of the adhesive. Therefore, it is necessary to study a low-viscosity, fast-curing colored adhesive. Contents of the invention [00...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09J175/14C08G18/67C08G18/32C08G18/10
CPCC09J175/14C08G18/672C08G18/3206C08G18/3275C08G18/10C08L2205/025C08L75/14
Inventor 刘仁皮玉红胡鹏
Owner JIANGNAN UNIV
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