A kind of photocurable prepolymer adhesive and preparation method thereof

Abstract

The invention discloses a photocuring prepolymer tackiness agent. The photocuring prepolymer tackiness agent is prepared from, by weight, 80%-98% of photocuring prepolymer, 2%-10% of modified polymercaptan and 0.005%-1% of photoinitiator. The photocuring prepolymer is prepared from, by weight, 70%-85% of polymer polyhydric alcohol, 10%-25% of diisocyanate, 1%-10% of vinyl ether containing hydroxyl and 0.01%-1% of addition agent. According to the photocuring prepolymer tackiness agent, the polyhydric alcohol in the prepolymer is pretreated, and the polymercaptan is modified, so that under the conditions that the content of the initiator is low and the amount of ultraviolet light energy needed by surface curing is small, it is guaranteed that the curing thickness is still kept large under the low ultraviolet light energy, the storage time is long, the production cost is greatly lowered, and application in actual production can be better facilitated.

Description

technical field

[0001] The invention relates to a photocurable adhesive, in particular to a prepolymer containing vinyl ether and a photocurable adhesive composed of mercaptan. Background technique

[0002] Photocurable adhesives, also known as UV adhesives, are basically composed of: (1) prepolymers; (2) reactive monomers; (3) photoinitiators; (4) additives. The basic principle of light-curing adhesives is: the main glue is irradiated with ultraviolet light for tens of seconds, and the photoinitiator decomposes to generate free radicals to polymerize and cure, and make it change from a linear structure to a network structure.

[0003] Photocurable prepolymers, also known as oligomers, are low-molecular polymers containing unsaturated functional groups, mostly acrylate-terminated oligomers. Prepolymers are the main body of photocurable resins, and their properties basically determine the curing process. The main properties of the material. Photocurable adhesives prepared f...

Examples

Embodiment 1

[0044] Synthesis of prepolymer PreP-1: 200 grams of polyester diol with a molecular weight (Mn) of 2000 and a hydroxyl value of about 56 was vacuum dehydrated at 120°C for 1 hour, and the dehydrated polyether diol, 44.46 Put 1,6-gram 1,6-diisocyanate together into the reactor, add 0.1 gram of dibutyltin dilaurate, react at 78°C for 4 hours, add 23.2 grams of 4-hydroxybutyl vinyl ether, 0.1 gram of hydroquinone to make As a polymerization inhibitor, continue to react at 78°C for 2 hours, cool to 45°C and discharge. It is called PreP-1.

Embodiment 2

[0046] Synthesis of prepolymer PreP-2: get 300 grams of polyether diol with a molecular weight (Mn) of 3000 and a hydroxyl value of about 37, and add C 12 -C 16 The proportion of alkyl alkoxy sulfate 10g will polyether glycol and C 12 -C 16 The alkyl alkoxy sulfate is fully mixed and reacted, the reaction temperature is 70°C, and the reaction time is 2 hours, the pretreatment process is completed. The modified polyether diol was vacuum dehydrated at 130°C for 2 hours, the dehydrated polyether diol and 45 grams of methylcyclohexyl diisocyanate were put into the reaction kettle together, and 0.2 grams of dilauric acid was added Dibutyltin, react at 80°C for 3 hours, add 26 grams of 4-hydroxybutyl vinyl ether, 0.1 gram of hydroquinone as a polymerization inhibitor, continue to react at 78°C for 2 hours, cool to 45°C and discharge Yes, call it PreP-2.

Embodiment 3

[0048] Synthesis of prepolymer PreP-3: 200 grams of polyether diol with a molecular weight (Mn) of 2000 and a hydroxyl value of about 56 was vacuum dehydrated at 120°C for 1 hour, and the dehydrated polyether diol, 44.46 Put 1 gram of isophorone diisocyanate into the reactor together, add 0.1 gram of dibutyltin dilaurate, react at 78°C for 3 hours, add 26 grams of hydroxyethyl methacrylate, and 0.1 gram of hydroquinone as a polymerization inhibitor agent, continue to react at 78°C for 2 hours, cool to 45°C and discharge, which is called PreP-3.

technical field

[0001] The invention relates to a photocurable adhesive, in particular to a prepolymer containing vinyl ether and a photocurable adhesive composed of mercaptan. Background technique

[0002] Photocurable adhesives, also known as UV adhesives, are basically composed of: (1) prepolymers; (2) reactive monomers; (3) photoinitiators; (4) additives. The basic principle of light-curing adhesives is: the main glue is irradiated with ultraviolet light for tens of seconds, and the photoinitiator decomposes to generate free radicals to polymerize and cure, and make it change from a linear structure to a network structure.

[0003] Photocurable prepolymers, also known as oligomers, are low-molecular polymers containing unsaturated functional groups, mostly acrylate-terminated oligomers. Prepolymers are the main body of photocurable resins, and their properties basically determine the curing process. The main properties of the material. Photocurable adhesives prepared f...

Examples

Embodiment 1

[0044] Synthesis of prepolymer PreP-1: 200 grams of polyester diol with a molecular weight (Mn) of 2000 and a hydroxyl value of about 56 was vacuum dehydrated at 120°C for 1 hour, and the dehydrated polyether diol, 44.46 Put 1,6-gram 1,6-diisocyanate together into the reactor, add 0.1 gram of dibutyltin dilaurate, react at 78°C for 4 hours, add 23.2 grams of 4-hydroxybutyl vinyl ether, 0.1 gram of hydroquinone to make As a polymerization inhibitor, continue to react at 78°C for 2 hours, cool to 45°C and discharge. It is called PreP-1.

Embodiment 2

[0046] Synthesis of prepolymer PreP-2: get 300 grams of polyether diol with a molecular weight (Mn) of 3000 and a hydroxyl value of about 37, and add C 12 -C 16 The proportion of alkyl alkoxy sulfate 10g will polyether glycol and C 12 -C 16 The alkyl alkoxy sulfate is fully mixed and reacted, the reaction temperature is 70°C, and the reaction time is 2 hours, the pretreatment process is completed. The modified polyether diol was vacuum dehydrated at 130°C for 2 hours, the dehydrated polyether diol and 45 grams of methylcyclohexyl diisocyanate were put into the reaction kettle together, and 0.2 grams of dilauric acid was added Dibutyltin, react at 80°C for 3 hours, add 26 grams of 4-hydroxybutyl vinyl ether, 0.1 gram of hydroquinone as a polymerization inhibitor, continue to react at 78°C for 2 hours, cool to 45°C and discharge Yes, call it PreP-2.

Embodiment 3

[0048] Synthesis of prepolymer PreP-3: 200 grams of polyether diol with a molecular weight (Mn) of 2000 and a hydroxyl value of about 56 was vacuum dehydrated at 120°C for 1 hour, and the dehydrated polyether diol, 44.46 Put 1 gram of isophorone diisocyanate into the reactor together, add 0.1 gram of dibutyltin dilaurate, react at 78°C for 3 hours, add 26 grams of hydroxyethyl methacrylate, and 0.1 gram of hydroquinone as a polymerization inhibitor agent, continue to react at 78°C for 2 hours, cool to 45°C and discharge, which is called PreP-3.

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