Water-soluble polymerizable photosensitive monomer and its preparation method and application

Abstract

The invention relates to a water-soluble polymerizable photosensitive monomer and its preparation method and application. The monomer comprises a unit containing a photosensitive structure, a unit containing a water-soluble quaternary ammonium salt structure, and a unit containing an unsaturated bond structure. The units of the structure are connected, and the unit containing the unsaturated bond structure is connected with the unit containing the photosensitive structure at least through the unit containing the water-soluble quaternary ammonium salt structure. The water-soluble polymerizable photosensitive monomer of the present invention has good compatibility in water-soluble curing systems, high photoinitiation efficiency, can reduce the migration and volatilization of photolytic fragments remaining in the system, and can effectively overcome the defect that small molecules are easy to migrate , and the water-soluble polymerizable photosensitive monomer of the present invention can prepare a hydrophilic coating with excellent lubricating properties.

Description

technical field [0001] The invention belongs to the field of photocuring technology, and in particular relates to a water-soluble polymerizable photosensitive monomer and its preparation method and application. Background technique [0002] Photocuring technology (UV) uses light to act on light-sensitive compounds to cause a series of photophysical and photochemical reactions to produce active substances, thereby triggering the polymerization and crosslinking of liquid oligomers (including monomers). It forms a solid product, which has the advantages of high efficiency and energy saving, and basically does not contain volatile solvents. It is known as "green technology" and has been widely used commercially. [0003] However, most of the traditional light-curing system formulations are oil-soluble substances, which have inherent disadvantages: for example, the prepolymer has a high viscosity, and reactive diluent molecules (monomers) are used to adjust the viscosity of the s...

AI Technical Summary

Problems solved by technology

[0003] However, most of the traditional light-curing system formulations are oil-soluble substances, which have inherent disadvantages: for example, the prepolymer has a high viscosity, and reactive diluent molecules (monomers) are used to adjust the viscosity of the system, but the degree to which monomers can reduce the viscosity of the system is limited. Some monomers are volatile and irritating, which will cause certain harm to the human body and the environment, and unreacted monomers will remain in the product after the light is over, and will easily migrate to the surface of the product during use and cause adverse effects

Domestic documents 2 and 3 disclose that benzophenone and thioxanthone photoinitiators are respectively introduced into the molecular chains of organosilicon macromolecules and polyethyleneimines to prepare water-soluble macromolecular photoinitiators. Macromolecular photoinitiators have good water solubility and can overcome the disadvantages of small molecule photoinitiators. However, the photoinitiator is introduced by grafting, and the proportion of photoinitiating units in the macromolecular chain is relatively small. It will affect the initiation efficiency of the photoinitiator; in addition, the molecular weight of the high molecular weight photoinitiator is too large, and the viscosity is too high so that it cannot be well dispersed, which will also affect its initiation activity

Domestic document 4 utilizes the reaction of alkaline substances and the carboxylic acid of the product itself to improve water solubility, and obtains a polymerizable and water-soluble photoinitiator, but it uses toxic triphenylphosphine as a reaction catalyst and the yield is not high. There are certain limitations in the application

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