Washable 3D printing dual-curing photosensitive resin composition and preparation method thereof

Abstract

The invention provides a washable 3D printing dual-curing photosensitive resin composition and a preparation method thereof. The composition contains hydrophilic photosensitive resin with an oxetane structure, a water-soluble photocuring diluting monomer, a photoinitiator, a curing agent and an auxiliary agent. Wherein the hydrophilic photosensitive resin with the oxetane structure is obtained by reacting polyisocyanate, a polyoxyethylene polyoxypropylene ether block copolymer, a hydroxyl acrylate compound and hydroxyl-containing oxetane; the curing agent is obtained by reacting diamine and an AOI-VM monomer. The photosensitive resin composition has excellent hydrophilicity, tensile strength and elongation at break, and is short in curing time, small in viscosity and easy to print; and a formed part can be washed, is easy to operate and free of pollution, and can meet the market performance requirements of verification models such as hand plate models, handicrafts and industrial parts.

Description

technical field [0001] The invention belongs to the field of 3D printing photosensitive resin materials, and particularly relates to a water-washable 3D printing dual-curing photosensitive resin composition and a preparation method thereof. Background technique [0002] 3D printing is the use of light rapid prototyping, a layer-by-layer forming technology, a new technology emerging in recent years, its materials are mainly derived from photosensitive resins and light-curable diluent monomers, with a wide range of material sources and low cost, so Development is relatively rapid. At present, after 3D printing photosensitive resin molding samples, secondary UV curing is generally required. Therefore, the excess liquid resin attached to the molding samples needs to be removed when the samples are just formed. At present, ultrasonic cleaning with organic solvents, such as ethanol and isopropanol, is mostly used. , acetone, etc. However, these solvents are volatile, have a punge...

AI Technical Summary

Problems solved by technology

At present, after 3D printing photosensitive resin molding samples, secondary UV curing is generally required. Therefore, the excess liquid resin attached to the molding samples needs to be removed when the samples are just formed. Most of them use organic solvents for ultrasonic cleaning, such as ethanol and isopropanol. , acetone, etc., but these solvents are volatile and have a pungent smell, which will cause certain harm to the human body, and the operation is not easy enough

[0003] Patent CN201910835200.1 discloses a UV light-curable water-based resin and its preparation method. The performance of the example product has a tensile strength of up to 29.8 MPa and an elongation rate of up to 3.2%. Moreover, both cannot be obtained at the same time, and the market verification cannot be achieved. The mechanical properties required by the model; the washing cleanliness is 9 points, and there is still a small amount of resin residue

[0004] Patent CN202010356325.9 discloses a dual-curing phase separation type continuous 3D printing high-precision photosensitive resin composition. By adding a chain extender small molecule polyol / polyamine, a product with high mechanical properties can be obtained after post-curing, but the product is oily. It is still necessary to use organic solvents to clean the residual resin, and it cannot be washed with water

Images