Photocurable transparent ink composition for three-dimensional molding and preparation method and application thereof

Abstract

A photocurable transparent ink composition for three-dimensional molding includes the following components in parts by weight: 60-125 parts of a photocuring agent, 0.01-5 parts of a yellowing adjusting agent, 0.5-5 parts of a photoinitiator, and 0.5-5 parts of an auxiliary agent, where the yellowing adjusting agent can absorb light in a wavelength range of 560 nm to 650 nm, so that the ink composition appears transparent. The photocurable transparent ink composition for three-dimensional molding can prevent yellowing of a printed article and make the printed article show a whiter, more transparent, and brighter appearance.

What is claimed is: 
     
         1 . A photocurable transparent ink composition for three-dimensional molding, comprising the following components in parts by weight: 60-125 parts of a photocuring agent, 0.01-5 parts of a yellowing adjusting agent, 0.5-5 parts of a photoinitiator, and 0.5-5 parts of an auxiliary agent; wherein the yellowing adjusting agent is capable of absorbing light in a wavelength range of 560 nm to 650 nm, so that the photocurable transparent ink composition for three-dimensional molding appears transparent;
 the yellowing adjusting agent is selected from one or more of a photocurable oligomer, a colorant, and a reducing agent; and   a printed article with a thickness of 2 mm obtained by a three-dimensional inkjet printing of the photocurable transparent ink composition for three-dimensional molding has a hue range as follows: L value is 80 to 90, a value is −1.00 to 2.00, and b value is −10.00 to 0; and has a light transmittance value of greater than 92%.   
     
     
         2 . The photocurable transparent ink composition for three-dimensional molding according to  claim 1 , wherein the photocurable oligomer is selected from blue phase acrylate oligomers; the colorant is selected from at least one of dyes and pigments; and the reducing agent is selected from compounds having reducing properties and being capable of participating in a photocuring reaction. 
     
     
         3 . The photocurable transparent ink composition for three-dimensional molding according to  claim 1 , wherein the yellowing adjusting agent comprises the colorant, and the colorant is ≤0.02 parts by weight. 
     
     
         4 . The photocurable transparent ink composition for three-dimensional molding according to  claim 1 , wherein the photocuring agent in the photocurable transparent ink composition for three-dimensional molding is 90 to 95 parts by weight. 
     
     
         5 . The photocurable transparent ink composition for three-dimensional molding according to  claim 2 , wherein the photocuring agent in the photocurable transparent ink composition for three-dimensional molding is 90 to 95 parts by weight. 
     
     
         6 . The photocurable transparent ink composition for three-dimensional molding according to  claim 1 , wherein the photocuring agent comprises a photocurable oligomer and a photocurable monomer, and a mass ratio of the photocurable oligomer to the photocurable monomer in the photocuring agent is (35-65): (25-60). 
     
     
         7 . The photocurable transparent ink composition for three-dimensional molding according to  claim 6 , wherein the photocurable oligomer is a transparent photocurable oligomer, and the photocurable monomer is a transparent photocurable monomer. 
     
     
         8 . The photocurable transparent ink composition for three-dimensional molding according to  claim 7 , wherein the transparent photocurable oligomer is selected from one or more of a transparent acrylate oligomer and a transparent epoxy oligomer, and the transparent photocurable monomer is selected from one or more of a transparent acrylate monomer and a cationic monomer. 
     
     
         9 . The photocurable transparent ink composition for three-dimensional molding according to  claim 1 , wherein the auxiliary agent is selected from one or more of a toughening agent, an antifoaming agent, a stabilizer, and a surfactant. 
     
     
         10 . The photocurable transparent ink composition for three-dimensional molding according to  claim 1 , wherein the photocurable transparent ink composition for three-dimensional molding has a viscosity of 25-70 cps and a surface tension of 20-30 dyn at room temperature, and has a viscosity of 9-14 cps and a surface tension of 20-35 dyn at 40-60° C. 
     
     
         11 . A preparation method of the photocurable transparent ink composition for three-dimensional molding according to  claim 1 , comprising:
 1) mixing 60-125 parts of the photocuring agent with 0.5-5 parts of the auxiliary agent to obtain a first mixture;   2) adding 0.5-5 parts of the photoinitiator to the first mixture to completely dissolve the photoinitiator to obtain a second mixture;   3) adding 0.01-5 parts of the yellowing adjusting agent to the second mixture until this mixing system is transparent to obtain a third mixture;   4) filtering the third mixture and collecting a filtrate.   
     
     
         12 . The preparation method according to  claim 11 , wherein the third mixture is subjected to a two stage filtration using a microporous filter membrane; wherein a first stage filtration is performed by using a glass fiber membrane having a pore diameter of 0.45 μm, and a second stage filtration is performed by using a polypropylene membrane having a pore diameter of 0.22 μm. 
     
     
         13 . The preparation method according to  claim 11 , further comprising: performing degassing on the filtrate to obtain the photocurable transparent ink composition for three-dimensional molding. 
     
     
         14 . A three-dimensional molding method for performing a three-dimensional inkjet printing by using the photocurable transparent ink composition for three-dimensional molding according to  claim 1  to obtain a printed article; wherein an injection temperature for the three-dimensional inkjet printing is 40-60° C.;
 the printed article with a thickness of 2 mm has a hue range as follows: L value is 80 to 90, a value is −1.00 to 2.00, and b value is −10.00 to 0; and has a light transmittance value of greater than 92%.