UV delayed curing adhesive and preparation method thereof

Abstract

The invention discloses a UV delayed curing adhesive and a preparation method thereof, and belongs to the technical field of adhesives. The UV delayed curing adhesive is prepared from the following raw materials in parts by weight: 60-90 parts of epoxy resin, 5-20 parts of polycaprolactone polyol, 1-10 parts of a cationic curing agent, 0.01-0.1 part of isopropyl thioxanthone and the like. The isopropyl thioxanthone and the epoxy resin are added and matched for use, the delay time of colloid after illumination activation and the polymerization rate of the colloid after solidification can be effectively controlled, the polymerization rate of the colloid is increased to 99% or above through the reasonable dosage of the isopropyl thioxanthone, the surface of the adhesive after solidification is smooth and not sticky, and the mechanical property is good. Besides, by adding the polyethyleneimine modified graphene oxide, the body strength of the adhesive is enhanced, the tensile strength after curing is 20-40 MPa, the elongation at break after curing is 100-200%, and the anti-falling performance of the adhesive is improved.

Description

technical field [0001] The invention relates to the technical field of adhesives, in particular to a UV delayed curing adhesive and a preparation method thereof. Background technique [0002] UV-curable adhesives have the advantages of fast curing and high strength, and are widely used in the electronics industry or related fields. However, the polymerization rate of the current UV-curable adhesive is 68-88%, so the surface of the UV adhesive will be sticky after activation, which will also affect the mechanical properties of the adhesive, and the tensile strength and elongation at break are both low. The tensile strength is between 7~10MPa, the elongation at break is between 20~30%, and the cured colloids are hard and brittle, with poor drop resistance; Reasonably, the extended curing time of UV glue after being activated by light is too short, and only short-term delayed curing can be achieved, generally between 5 and 30 seconds, and the operable time is very short, so sh...

AI Technical Summary

Problems solved by technology

However, the polymerization rate of the current UV-curable adhesive is 68-88%, so the surface of the UV adhesive will be sticky after activation, which will also affect the mechanical properties of the adhesive, and the tensile strength and elongation at break are both low. The tensile strength is between 7~10MPa, the elongation at break is between 20~30%, and the cured colloids are hard and brittle, with poor drop resistance; Reasonably, the extended curing time of UV glue after being activated by light is too short, and only short-term delayed curing can be achieved, generally between 5 and 30 seconds, and the operable time is very short, so short operable when used on the production line time has brought invisible pressure to the work of workers