Light-curable transparent ink for 3D ink-jet printing and preparation method thereof

1. A light-curable transparent ink for 3D ink-jet printing, comprising the following components in parts by weight: 0 to 60 parts of a non-mercapto-modified acrylate oligomer, 25 to 50 parts of the acrylate monomer, 10 to 50 parts of the mercapto compound, 0.01 to 2 parts of the surfactant, 0.5 to 5 parts of the photoinitiator, and 0.5 to 5 parts of the additive,

wherein the mercapto compound comprises a mercapto-modified acrylate oligomer,

wherein the mercapto-modified acrylate oligomer comprises one or more of a mercapto-modified aliphatic urethane acrylate oligomer and a mercapto-modified silicone photosensitive resin oligomer.

2. The light-curable transparent ink according to claim 1 , wherein the light-curable transparent ink has a viscosity of 9˜15 cps at an operating temperature and surface tension of 19˜30 dyn;

wherein the operating temperature is equal to or higher than 40° C.

3. The light-curable transparent ink according to claim 2 , wherein the mercapto compound further comprises a mercaptan.

4. The light-curable transparent ink according to claim 3 , wherein the number of carbon atoms of the mercaptan is not less than 8.

5. The light-curable transparent ink according to claim 1 , wherein the acrylate monomer is an acrylate monomer that does not contain a benzene ring structure.

6. The light-curable transparent ink according to claim 5 , wherein the number of conjugated bonds contained in the acrylate monomer is not more than 5.

7. The light-curable transparent ink according to claim 6 , wherein the acrylate monomer comprises an aliphatic acrylate monomer.

8. The light-curable transparent ink according to claim 7 , wherein the aliphatic acrylate monomer comprises one or more of a monofunctional aliphatic acrylate monomer, a bifunctional aliphatic acrylate monomer, a multifunctional aliphatic acrylate monomer and a cycloalkane acrylate monomer.

9. The light-curable transparent ink according to claim 8 , wherein the multifunctional aliphatic acrylate monomer has a functionality of not more than 5.

10. The light-curable transparent ink according to claim 9 , wherein, when the acrylate monomer is a mixture of a plurality of compounds, the compound occupying the highest proportion in the mixture has a viscosity of less than 15 cps at 25° C.

11. The light-curable transparent ink according to claim 10 , wherein the non-mercapto-modified acrylate oligomer comprises one or more of a pure acrylate oligomer, a non-mercapto-modified aliphatic urethane acrylate oligomer and a non-mercapto-modified silicone photosensitive resin oligomer.

12. The light-curable transparent ink according to claim 1 , wherein the surfactant comprises one or more of a radiation-crosslinkable silicone acrylate and a modified polysiloxane polymer.

13. The light-curable transparent ink according to claim 12 , wherein the photoinitiator is free radical photoinitiator.

14. The light-curable transparent ink according to claim 13 , wherein the additive is selected from one or more of a toughener, a defoamer and a stabilizer.

15. A preparation method for light-curable transparent ink according to claim 1 , comprising the following steps:

1) mixing evenly all components except the photoinitiator to obtain a first mixture; then adding the photoinitiator to the first mixture and dissolving the photoinitiator completely to obtain a second mixture;

2) performing filtration of the second mixture and collecting the resulting filtrate to obtain the light-curable transparent ink.

16. The preparation method according to claim 15 , wherein the filtration employs a microporous membrane to perform a two phase filtering on the second mixture, wherein the first phase filtering employs a glass fiber membrane with a pore diameter of 0.45 μm, and the second phase filtering employs a polypropylene membrane with a pore diameter of 0.22 μm.

17. The preparation method according to claim 15 , further comprising degassing the collected filtrate.