Connecting material for cold transfer printing paper and preparation

1. A cold transfer printing paper, comprising a base paper and an isolating layer formed thereon and an ink-receiving layer formed on the isolating layer; said isolating layer and ink-receiving layer are obtained respectively by curing a first acrylic coating agent composition for forming the isolating layer, comprising, based on the total weight of the composition, 20-30% of an acrylic resin; 60-77% of a solvent; 2-8% of a toughening agent; and 0.2-2% of a filler on said base paper and a second acrylic coating agent composition for forming the ink receiving layer, comprising 15-30% of an acrylic monomer; 15-23% of a modified starch; 5-8% of an emulsifier; 0.5-1.2% of a wetting agent; 0.3-0.6% of a non-emulsifying surfactant; 0.4-0.9% of an initiator; 0.001-0.01% of a crosslinking agent; 0.12-0.15% of a terminator, and water balanced to 100% on said isolating layer.

2. The cold transfer printing paper according to claim 1 , wherein the acrylic resin includes polymers of C1-C10 alkyl (meth)acrylate.

3. The cold transfer printing paper according to claim 1 , wherein the acrylic resin is a copolymer of methyl methacrylate and n-butyl methacrylate having a weight ratio of the comonomers of from 5:5 to 4:6; the solvent is a mixture of ethyl acetate and dimethyllformamide in a weight ratio of from 2:8 to 5:5; the toughening agent is dioctyl phthalate; and the filler is fumed silica.

4. The cold transfer printing paper according to claim 3 , wherein the acrylic coating agent composition or forming the isolating layer, based on the total weight of the composition, comprises: 25% of a copolymer of methyl methacrylate and n-butyl methacrylate having a weight ratio of the comonomers of 4:6; 20% of ethyl acetate and 50% of dimethylformamide; 4.5% of dioctyl phthalate; and 0.5% of fumed silica.

5. The cold transfer printing paper according to claim 1 , wherein the acrylic monomer includes acrylic acid and C1-C4 alkyl acrylates; the modified starch is vinyl ester modified starch; the emulsifier is sorbitan monooleate; the wetting agent is sodium pyrrolidone carboxylate; the non-emulsifying surfactant is sulfosuccinate 4910; the initiator is potassium persulfate; the crosslinking agent is N-hydroxymethyl acrylamide; and the terminator is sodium sulfite.

6. The cold transfer printing paper according to claim 1 , wherein the acrylic monomer is a mixture of acrylic acid and butyl acrylate in a weight ratio of from 1:1 to 1:2.5.

7. The cold transfer printing paper according to claim 1 , wherein the acrylic coating agent composition for forming the ink-receiving layer, based on the total weight of the composition, comprises: 7% of acrylic acid monomer and 14.5% of butyl acrylate monomer; 18.6% of vinyl ester modified dextrin; 6% of sorbitan monooleate; 1% of sodium pyrrolidone carboxylate; 0.5% of sulfosuccinate 4910; 0.5% of potassium persulfate; 0.001% of N-hydroxymethyl acrylamide; 0.15% of sodium sulfite; and distilled water balanced to 100%.

8. A method for printing a pattern or letter on a fabric, comprising forming an inked image on the cold transfer printing paper according to claim 1 and transferring the inked image to a fabric.

9. The method according to claim 8 , wherein the fabric is selected from the group consisting of fabrics made of natural fibers, fabrics made of protein fibers, and fabrics made of chemical fibers.

10. The method according to claim 9 , wherein the fabric comprises natural fibers which are selected from the group consisting of modified cellulose fibers and cotton.

11. The method according to claim 9 , wherein the fabric comprises protein fibers selected from the group consisting of wool and silk.

12. The method according to claim 9 , wherein the fabric comprises chemical fibers selected from the group consisting of terylene, nylon, and acrylic fiber.

13. A method for preparing a connecting material for cold transfer printing paper having a connecting material comprising an isolating layer and an ink receiving layer thereon comprising:

preparing a first acrylic coating agent composition for forming an isolating layer by providing an acrylic resin and a solvent and mixing them to obtain a transparent mixture, and adding a toughening agent and a filler to said mixture and mixing together until uniform, thereby obtaining the first acrylic coating agent composition for forming the isolating layer; coating and curing the first acrylic coating agent composition onto a surface of a base paper to form the isolating layer;

preparing a second acrylic coating agent composition for forming an ink-receiving layer by providing water and a modified starch, and allowing the modified starch to dissolve and maturate under heating and stirring conditions, adding an emulsifier to the obtained mixture at a temperature of 35-40° C., to make an emulsion, at a temperature of 50-60° C., adding to said emulsion an acrylic monomer, a wetting agent and a non-emulsifying surfactant in turn, followed by mixing them under stirring until uniform, adding an initiator and a crosslinking agent at a temperature of 55-60° C. to initiate graft copolymerization reaction, adding a copolymerization terminator under stirring when the system temperature reaches 65-70° C., and according to GB/T1723-93 method, measuring viscosity of the resulting product using a Zahn 3# cup, when the flow rate is 50-58 seconds, immediately cooling down the system to room temperature with refluxing water, thereby obtaining the second acrylic coating agent composition for forming the ink-receiving layer; and coating and curing the second acrylic coating agent composition onto the isolating layer to form the ink receiving layer.

14. The method according to claim 13 , wherein the step of providing water and modified starch is carried out by feeding water and modified starch to an industrial reactor, stirring them until uniform, then raising the temperature to 65-90° C. and maintaining this temperature until the modified starch is fully dissolved and maturated; and, after adding an emulsifier, further stirring for 50-90 minutes to make an emulsion.

15. The method according to claim 13 , further comprising adjusting the pH of the resulting product to pH=7-9.