Preparation and performance of bisphenol⁃A type epoxy acrylate photosensitive resin for ultraviolet cured 3D direct ink writing printing

doi:10.19491/j.issn.1001-9278.2024.11.005

Abstract

Abstract:

A free radical photosensitive resin suitable for ultraviolet （UV） cured 3D direct ink writing printing was synthesized using bisphenol⁃A epoxy acrylate （EA） as a prepolymer， 1，6⁃hexanediol diacrylate （HDDA） as a monomer， and 2，4，6⁃trimethylbenzoyl diphenylphosphine oxide （TPO） as an initiator. The resin could form a cross⁃linked network under UV irradiation. The effect of TPO content on the surface drying time， gel rate， and volume shrinkage of photosensitive resin were investigated. The results indicated that when 6 g TPO was added， the surface drying time of the cured resin was the shortest， its gel rate was highest， and its volume shrinkage was largest. According to these results， the effect of the mass ratio of prepolymer to monomer on the surface drying time， viscosity， gel rate， volume shrinkage， and mechanical properties of the photosensitive resin were investigated. The results demonstrated that the photosensitive resin containing 6 g TPO had the shortest surface drying time， lower viscosity， the largest gel rate， and excellent mechanical properties at an EA/HDDA of 20/9. This suggests that the developed photosensitive resin is suitable for use in UV cured 3D direct ink writing printing.

Key words: photosensitive resin, 3D direct ink writing printing, bisphenol A epoxy acrylate, 1，6?hexanediol diacrylate, 2，4，6?trimethylbenzoyl diphenylphosphine oxide

CLC Number:

TQ322

FANG Xiaotong, SHI Yerong, HU Jing. Preparation and performance of bisphenol⁃A type epoxy acrylate photosensitive resin for ultraviolet cured 3D direct ink writing printing[J]. China Plastics, 2024, 38(11): 27-32.

Figures/Tables 13

样品编号	EA	HDDA	TPO
1	100	45	4
2	100	45	5
3	100	45	6
4	100	45	7
5	100	45	8

Tab.1. Formula of the samples used to study the effect of photoinitiator content on resin properties

样品编号	EA/g	HDDA/g	TPO/g	EA/HDDA质量比
1	100	20	6	20/4
2	100	25	6	20/5
3	100	30	6	20/6
4	100	35	6	20/7
5	100	40	6	20/8
6	100	45	6	20/9

Tab.2. Formula of the samples used to study the effect of prepolymer and monomer mass ratio on resin properties

Fig.1. Mechanism of TPO absorbing ultraviolet light to produce reactive free radicals

Fig.2. Mechanism of the EA/HDDA/TPO photopolymerization reaction

Fig.3. FTIR spectra of photosensitive resin before and after light curing

Fig.4. 1H⁃NMR spectra of the HDDA and photosensitive resin

Fig.5. Effect of TPO content on surface drying time

Fig.6. Effect of TPO content on gel rate and volume shrinkage

Fig.7. Effect of mass ratio of EA and HDDA on viscosity

Fig.8. Effect of mass ratio of EA and HDDA on surface drying time

Fig.9. Effect of mass ratio of EA and HDDA on gel rate and volume shrinkage

Fig.10. Effect of mass ratio of EA and HDDA on mechanical properties

Fig.11. UV curing 3D direct ink writing device and the printing sample

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