Organosilicon-modified acrylate emulsion and preparation method thereof, heat transfer printing back coating liquid, heat transfer printing carbon ribbon back coating and carbon ribbon

[0088] According to the second aspect of the present invention, the present invention provides a method for preparing the aforementioned silicone-modified acrylate emulsion, which includes the following steps: dissolving acrylate monomer and silicone-modified acrylate active monomer in a solvent, and then adding The initiator, the acrylate monomer and the organic silicon modified acrylate active monomer undergo polymerization reaction to obtain the organic silicon modified acrylate emulsion.

[0089] The organosilicon modified acrylate emulsion provided by the invention has simple preparation process, convenient operation, convenient realization of large-scale production, and lower preparation cost.

[0090] In a preferred embodiment of the present invention, the acrylate monomer and the organically modified acrylic oligomer are dissolved in a solvent, heated to 30-35°C, and an initiator is added to further improve the polymerization efficiency and shorten the polymerization time. .

[0091] Typically, but not restrictively, the acrylate monomer and the organically modified acrylic oligomer are dissolved in a solvent, heated to 30, 31, 32, 33, 34, or 35°C before adding the initiator.

[0092] In a further preferred embodiment of the present invention, the initiator is added in multiple times to facilitate the control of the polymerization reaction to obtain a polymer with a higher number average molecular weight, so as to further improve the adhesion performance of the emulsion, and prepare a higher number average molecular weight. High polymer improves the overall performance of the emulsion.

[0093] In a preferred embodiment of the present invention, the initiator is added in three times, the first preparation process is simpler, and the number average molecular weight of the polymer obtained by the polymerization reaction is easier to control.

[0094] When the initiator is added in three times, the added amount of the first initiator is about 1/2 of the total, the second is about 1/3 of the total, and the third is about 1/6 of the total.

[0095] According to the third aspect of the present invention, the present invention provides a thermal transfer back coating liquid, which is mainly obtained by diluting the silicone modified acrylate emulsion of the present invention.

[0096] An organic solvent is used to dilute the silicone modified acrylate emulsion provided by the present invention to obtain a thermal transfer back coating liquid, so as to facilitate the thermal transfer back coating liquid to be coated on a substrate.

[0097] The thermal transfer back coating liquid is prepared by using the silicone acrylate emulsion provided by the present invention, so that the thermal transfer back coating formed by coating on the substrate has good adhesion performance to the substrate, heat resistance and cool Good sliding performance, long service life, low printing noise, can effectively meet the needs of the transfer process.

[0098] The type of the organic solvent includes one or more of toluene, methanol, acetone, methyl acetate, methyl ether, and ethyl ether, which are the same as those described above, and will not be repeated here.

[0099] In a preferred embodiment of the present invention, the solid content of the silicone modified acrylate emulsion provided by the present invention is 40-60 wt%, and the solid content of the thermal transfer back coating liquid provided by the present invention is 15-25 wt% .

[0100] Typical but non-limiting, the solid content of the silicone modified acrylate liquid is 40wt%, 45wt%, 50wt%, 55wt% or 60wt%, and the solid content of the thermal transfer back coating liquid is, for example, 15wt%, 18wt%. , 20wt%, 22wt% or 25wt%.

[0101] The fourth object of the present invention is to provide a thermal transfer carbon belt back coating, which is mainly obtained by coating and drying the thermal transfer back coating liquid provided by the present invention on a substrate.

[0102] In a preferred embodiment of the present invention, the coating amount of the thermal transfer back coating liquid on the substrate is 0.05-0.12 g/m 2.

[0103] It should be noted that the coating amount of the thermal transfer back coating liquid on the substrate refers to the coating amount of the back coating formed on the substrate after the thermal transfer back coating liquid is dried.

[0104] The coating of the backcoating liquid has high requirements for the coating amount (the thickness of the backcoating), the uniformity of the coating, and the drying ability of the coating equipment. If the coating amount of the back coating liquid is high, the high temperature generated by the print head during printing needs to pass through the base film, back coating (a certain thickness), and primer coating to finally be transferred to the ink layer. This process consumes more heat. The temperature required for the melting of the ink layer cannot be reached, and the peeling effect of the ink is poor, which makes the quality of the printed imprint worse. If the uniformity of the back coating is not good, the heat eventually transferred to the ink layer will not be uniform, which will cause the print edge to be missing. If the backcoating liquid cannot be completely dried on the substrate film, or the drying is insufficient, the adhesion of the backcoating liquid to the substrate will deteriorate, which will cause problems such as print head pollution and printing noise. In summary, the amount of backcoat liquid applied will affect the heat transfer performance of the backcoat and thus affect the print quality. Therefore, this application controls the coating amount of the back coating liquid on the substrate to be 0.05-0.12g/m 2 , When the coating amount is less than 0.05/m 2 When the heat resistance of the back coating is poor, the carbon belt can break down; when the coating amount is greater than 0.12g/m 2 When the barcode border is easily missing, the printing effect is poor. Especially when the coating amount of the thermal transfer back coating liquid on the substrate is 0.05-0.1g/m 2 When, the overall performance of the obtained thermal transfer ribbon back coating is better.

[0105] Typical but non-limiting, the coating amount of the thermal transfer backcoating liquid on the substrate is 0.05, 0.06, 0.08, 0.1 or 0.12g/m 2.

[0106] Such as figure 1 As shown, according to the fifth aspect of the present invention, the present invention provides a carbon ribbon. The carbon ribbon includes a substrate 1, and one side of the substrate 1 is provided with a thermal transfer carbon ribbon back coating 2, and The other side of the substrate 1 is provided with an undercoating layer 3 and an ink layer 4, and the undercoating layer 3 is provided between the substrate 1 and the ink layer 4. The schematic diagram of the structure is as attached figure 1 Shown.

[0107] Among them, in the thermal transfer ribbon back coating 2, ○○○ represents the organic chain, and ◇◇◇ represents the organic silicon chain.

[0108] In a preferred embodiment of the present invention, the substrate 1 is a PET film.

[0109] According to the sixth aspect of the present invention, the present invention provides the application of the above-mentioned carbon ribbon in the field of thermal transfer printing.

[0111] Example 1

[0112] This embodiment provides a silicone modified acrylate emulsion. The raw materials include the following raw materials in parts by mass: 60 parts of acrylate monomers, 40 parts of silicone modified acrylate active monomers, and diphenyl peroxide Formyl (BPO) 0.3 parts, in which the molecular formula of silicone modified acrylate is R 1 -Si(CH 3 ) 2 -(O-Si(CH 3 ) 2 ) n -O-Si(CH 3 ) 2 -OCO-C(CH 3 )=CH 2 , The number average molecular weight is 10000, R 1 Is n-butyl, R 2 It is a propyl group, and the acrylate monomer is a mixture of methyl methacrylate and butyl acrylate, and the mass ratio of the two is 65:8.

[0113] Example 2

[0114] This embodiment provides a silicone modified acrylate emulsion. The raw materials include the following raw materials in parts by mass: 80 parts of acrylate monomers, 20 parts of silicone modified acrylate active monomers, and diphenyl peroxide 0.3 parts of formyl, wherein the silicone-modified acrylate and acrylate monomers are the same as those in Example 1, and will not be repeated here.