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UV-cured adhesive for plastic and preparation method thereof

A technology of adhesives and ultraviolet light, which is applied in the direction of adhesives, adhesive types, polyurea/polyurethane adhesives, etc., to achieve the effects of fast curing speed, simple and easy operation, and improved shear strength

Inactive Publication Date: 2010-12-08
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this method still has the above-mentioned problems

Method used

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  • UV-cured adhesive for plastic and preparation method thereof
  • UV-cured adhesive for plastic and preparation method thereof
  • UV-cured adhesive for plastic and preparation method thereof

Examples

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Embodiment 1

[0024] A preparation method of an ultraviolet light-curable adhesive for plastics, comprising the following steps and process conditions:

[0025] (1) Preparation of polyurethane acrylate: under uniform stirring at 80rpm, polyethylene glycol (PEG) is added dropwise to 3-isocyanate-3,5,5-trimethylcyclohexyl isocyanate (IPDI), and the temperature is raised to 45 ℃, every 30 minutes, measure the free content of isocyanate group (-NCO) with di-n-butylamine titration method, when -NCO reacts 45% (the weight ratio of isocyanate group and raw material during detection), add catalyst dibutyltin di Luuric acid ester (DBTL), then add hydroxyethyl methacrylate (HEMA), heat up to 60 ° C, and add 2,6-di-tert-butyl p-cresol; stir to disperse evenly, every 30 minutes, use Di-n-butylamine titration method measures the free content (-NCO%) of isocyanate group, and the mass percent to-NCO free content is less than 0.5% (the ratio of raw material gross weight during the isocyanate group that rec...

Embodiment 2

[0038] (1) Preparation of polyurethane acrylate: under uniform stirring at 80rpm, polyethylene glycol (PEG) is added dropwise to 3-isocyanate-3,5,5-trimethylcyclohexyl isocyanate (IPDI), and the temperature is raised to 50 ℃, every 30 minutes, use the di-n-butylamine titration method to measure the mass percentage of isocyanate group relative to the mixture in the reactor at this time (-NCO%), when -NCO reacts 50%, add the catalyst dibutyltin dimonthly silicon acid ester (DBTL), then add hydroxyethyl methacrylate (HEMA), heat up to 70°C, and add 2,6-di-tert-butyl-p-cresol; stir and disperse evenly until the free content of -NCO reaches 0.4% (mass percentage) to stop the reaction; when the temperature in the bottle drops to 45° C., add absolute ethanol and react for 25 minutes to obtain a colorless viscous liquid that is polyurethane acrylate. Wherein, the molar ratio of polyethylene glycol (PEG), 3-isocyanate-3,5,5-trimethylcyclohexyl isocyanate (IPDI), and hydroxyethyl methac...

Embodiment 3

[0045] (1) Preparation of polyurethane acrylate: under uniform stirring at 80rpm, polyethylene glycol (PEG) is added dropwise to 3-isocyanate-3,5,5-trimethylcyclohexyl isocyanate (IPDI), and the temperature is raised to 50 ℃, every 30 minutes, use the di-n-butylamine titration method to measure the mass percentage of isocyanate group relative to the mixture in the reactor at this time (-NCO%), when -NCO reacts 50%, add the catalyst dibutyltin dimonthly silicon acid ester (DBTL), then add hydroxyethyl methacrylate (HEMA), heat up to 70°C, and add 2,6-di-tert-butyl-p-cresol; stir and disperse evenly until the free content of -NCO reaches 0.4% (mass percentage) to stop the reaction; when the temperature in the bottle drops to 45° C., add absolute ethanol and react for 25 minutes to obtain a colorless viscous liquid that is polyurethane acrylate. Wherein, the molar ratio of polyethylene glycol (PEG), 3-isocyanate-3,5,5-trimethylcyclohexyl isocyanate (IPDI), and hydroxyethyl methac...

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Abstract

The invention discloses a novel UV-cured adhesive for plastic and a preparation method thereof. The UV-cured adhesive is prepared by the following steps of: adding polyurethane acrylate and a monomer diluent into an epoxy acrylate resin, stirring at the constant temperature of between 50 and 55 DEG C for 3 to 4 hours, and adding a photoinitiator, an accelerating agent and a polymerization inhibitor; and regulating the temperature to between 60 and 70 DEG C, stirring at the constant temperature for 1 to 2 hours and discharging to prepare the novel UV-cured adhesive. The UV-cured adhesive comprises the following components in percentage by weight: 30 to 60 percent of polyurethane acrylate, 10 to 30 percent of epoxy acrylate resin, 4 to 5 percent of photoinitiator, 25 to 65 percent of monomer diluent, 0.1 to 0.9 percent of accelerating agent and 0 to 0.2 percent of polymerization inhibitor. The product is mainly applied to adhesion of PVC, ABS, PC, PMMA and other plastics, and has the advantages of no solvent, simple and easy operation and suitability for mass production.

Description

technical field [0001] The invention belongs to the field of preparation and application of curing adhesives, in particular to an ultraviolet curing adhesive for plastics and a preparation method thereof. Background technique [0002] Since UV-curable adhesives have many advantages that cannot be replaced by other adhesives, they conform to the principles of 4E, namely economy, energy, ecology, and efficiency. These characteristics of it coincide with the main development direction of the current adhesive: quickness, simplicity, environmental protection and high efficiency. UV-curable adhesives have the following characteristics: fast curing speed, the curing time can be controlled within a few seconds or tens of seconds, and the curing time can be adjusted according to actual needs, which is conducive to automated production and improved production efficiency; the process is easy to operate and control, It can be completely cured at room temperature without heating or othe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J175/16C09J163/10
Inventor 袁文辉王德临李莉
Owner SOUTH CHINA UNIV OF TECH
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