3d printing set and method for 3d inkjet printing by using the same

Abstract

The present invention provides a method for 3D inkjet printing, which comprises: a preheating step: an external heating source is used to heat a main body layer composed of a first composition to a first temperature, wherein the main body layer has a thickness of 10 μm to 500 μm and a unit density of 0.1 to 1.0 g/cm3, and the first temperature is less than the melting point of the first composition; a heating step: a second composition is applied to the surface of the first composition at the first temperature of the composite to proceed an exothermic cross-linking polymerization, so that the main body layer is heated to a second temperature to become a molten state; and a cooling step: the main body layer in the molten state is cooled down and solidified to form.

What is claimed is: 
     
         1 . A set for 3D printing, comprising:
 a first composition comprising at least a molding material, the molding material being a compound A, a compound B, or a polyamine compound, in which the compound A is a polyamide selected from the group consisting of polyamide-6 (PA-6), polyamide-66 (PA-66), polyamide-610 (PA-610), polyamide-1010 (PA-1010), polyamide-11 (PA-11), polyamide-12 (PA-12), polyamide-9 (PA-9), polyamide-612 (PA-612), polyamide-121 (PA-121), polyphthalamide (PPA), and polyparaphenylene terephthalamide (PPTA), the compound B is a polyurethane selected from the group consisting of polyurethane (PU), and thermoplastic polyurethane (TPU); the polyamine compound is selected from the group consisting of ethylenediamine, 1,3-propanediamine, 1,4-butanediamine, 1,5-pentanediamine, diethylenetriamine, 1,2-propanediamine, 1,4-diazacycloheptane, and phenylenediamine;   a second composition comprising at least a compound C selected from the group consisting of toluene diisocyanate (TDI), isophorone diisocyanate (IPDI) diphenyl methane diisocyanate (MDI), dicyclohexylmethane diisocyanate (H 12 MDI), lysine diisocyanate (LDI), HDI polyisocyanates, 1,3,5-triazine-2,4,6(1H,3H,5H)-trione, 1,3,5-tris(6-isocyanatohexyl), 1,3,5-tris(6-hydroxyhexyl)biuret triisocyanate, potassium cyanate, sodium hydrogenate, and ammonium cyanate, wherein a weight ratio of the molding material in the first composition to the compound C in the second composition is in a range of 1:1 to 10:1.   
     
     
         2 . The set for 3D printing according to  claim 1 , wherein the second composition further comprises at least one component selected from the group consisting of a catalyst, a physical property modifier, a dispersing agent, a cosolvent, and a coloring agent. 
     
     
         3 . The set for 3D printing according to  claim 2 , wherein the catalyst is dibutyltin dilaurate (DBTDL), and the physical property modifier is at least one selected from the group consisting of polyols, polyether polyols, polyester polyols, and combinations thereof.