JPH0448966A - Transfer printing method by liquid pressure - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for performing transfer printing on the surface of a molded article made of ABS resin or polystyrene resin using water pressure.

[Prior Art] A printed pattern layer is formed on the surface of a molded article having a complicated surface shape, such as a three-dimensional surface (three-dimensional shape) or a curved surface, in particular, as a means of painting with a printed pattern layer. After floating a hydraulic transfer sheet on the water surface (liquid surface) with the printed pattern layer side of the transfer sheet facing upward, a predetermined molded object to be painted (transferred object) is placed from above. A method is used in which the printed pattern layer of the transfer sheet is transferred to the surface of the molded body by pressing.

[Problems to be Solved by the Invention] The conventional transfer printing method using hydraulic pressure includes a transfer sheet having a printed pattern layer containing nitrocellulose and alkyd resin as binder components, and a solvent that dissolves the binder components. A combination of an activator in which nitrocellulose and alkyd resin are dissolved is used, but the adhesion of the printed pattern layer formed on the transfer sheet is poor, making it difficult to form a material that can be used as a transfer object. Body types are limited.

In particular, when painting the surface of a polystyrene resin molded body using the above-mentioned transfer printing method, the adhesive strength between the transferred printed pattern layer and the polystyrene resin molded body is insufficient, so that the painting cannot be applied. For example, a predetermined surface of a polystyrene resin molded body must be coated with a urethane paint or an acrylic paint in advance, and transfer printing must be performed on this brimer-coated surface.
The drawbacks are that the process is complicated and the expense for transfer printing increases.

In contrast, the hydraulic pressure transfer printing method of the present invention can be applied to polystyrene resin molded bodies, which conventionally required brimer coating with urethane paint or acrylic paint. A printing method that allows direct transfer printing without such a brimer coating, and for ABS resin molded bodies that have conventionally been directly transfer printed, it is possible to apply a printing method that allows direct transfer printing to be performed with an ABS resin molded body formed by conventional transfer printing. To provide a transfer printing method capable of obtaining adhesion strength even superior to that between a printed pattern layer and a printed pattern layer.

[Means for Solving the Problems 1] In the hydraulic pressure transfer printing method of the present invention, a transfer sheet made of a water-soluble support having a printed pattern layer on its surface is floated on a liquid surface, and the printed pattern layer is coated with an activator. The printed pattern layer on the transfer sheet is transferred to the transfer sheet by activating the transfer sheet and pressing a transfer object made of ABS resin or polystyrene resin molding onto the transfer sheet from above the liquid surface. It is something.

In the hydraulic pressure transfer printing method of the present invention, the printed pattern layer of the transfer sheet is formed by using a copolymer of butyl methacrylate and ethyl methacrylate or a mixed resin of the copolymer and nitrocellulose as a binder component, and using the binder component as a binder component. is formed by a printing ink in which is dissolved in a mixed solvent of methyl ethyl ketone and toluene, and an activator in which butyl metachloride is dissolved is used as an activator for activating the printed pattern layer. In the method of the present invention, a water-soluble or water-swellable film is used as the water-soluble support for forming the printed pattern layer for transfer, such as polyvinyl alcohol resin, dextrin, gelatin, glue, casein shellac, Gum arabic, starch, protein, polyacrylic acid amide, sodium polyacrylate, polyvinyl methyl ether, copolymer of methyl vinyl ether and maleic anhydride, copolymer of vinyl acetate and itaconic acid, polyvinyl pyrrolidone, acetyl cellulose, acetyl butyl cellulose , carboxymethyl cellulose, methyl cellulose, hydroxyethyl cellulose, sodium alginate, and the like, films having a thickness of about 10 to 100 μm are used.

The printed pattern layer formed on the surface of the water-soluble support is made of a binder component made of a copolymer of butyl methacrylate and ethyl methacrylate or a mixed resin of the copolymer and nitrocellulose, and a mixed solvent of methyl ethyl ketone and toluene. It is formed by a printing ink that utilizes the above-mentioned printing ink, and it goes without saying that the printing ink may contain colorants such as dyes or pigments, as well as dispersants, plasticizers, extender pigments, etc. as necessary. It is.

As the butyl methacrylate-ethyl methacrylate copolymer, a copolymer in which the ratio of butyl methacrylate to ethyl methacrylate is about 6:4 to 8:2 (weight ratio) is used.

In addition, as a binder component in the printing ink,
When a mixed resin of butyl methacrylate-ethyl methacrylate copolymer and nitrocellulose is used, the weight ratio of the two is about 6:4 to 8:2.

Further, the proportions of the mixed solvent of methyl ethyl ketone and toluene in the printing ink are approximately equal.

The printed pattern layer on the water-soluble support can be formed by, for example, an intaglio printing method, a lithographic printing method, a letterpress printing method, a screen printing method, a brush coating, a spatula coating, a spray coating, etc., into a desired pattern, two figures, one character, or a symbol. It is formed as a printed pattern layer.

As the activator for activating the printed pattern layer in the transfer sheet, a solvent in which butyl methacrylate is dissolved is used that activates the binder component in the printed pattern layer.

The most suitable solvent in which the butyl methacrylate is dissolved is a mixed solvent of butyl cellosolve acetate and butyl carpitol acetate to which dibutyl phthalate is added as a plasticizer.

[Example] Hereinafter, a specific configuration of the hydraulic pressure transfer printing method of the present invention will be described with reference to an example.

Example 1 - A printed pattern layer with an abstract pattern was formed on the surface of a polyvinyl alcohol resin film with a thickness of 40 μm using printing inks having the following ink compositions [IA] to [IC], After drying, it was wound up with a take-up roll to obtain a transfer sheet.

Ink composition [IA] (1) Solvent: 67 parts by weight [Mixed solvent of methyl ethyl ketone and toluene in l:l (weight ratio)] (2) Binder component: 23 Parts by weight [Mixture of butyl methacrylate-ethyl methacrylate copolymer and nitrocellulose at a ratio of 6.5:3.5 (weight ratio)] (3) @Coloring agent/isoindolinone 10 weight Part ink composition [IB] (1/1 solvent......65 parts by weight [mixed solvent of methyl ethyl ketone and toluene in l/l (weight ratio)] (2) Binder component... 22 parts by weight [mixture of butyl meccrylate-ethyl methacrylate copolymer and nitrocellulose at a ratio of 8=2 (weight ratio)] (3) Colorant: Quinacridone...13 parts by weight Ink composition [IC ] (1) M agent --- 65 parts by weight [Mixed solvent of methyl ethyl ketone and toluene at l:1 (weight ratio)] (2) Binder component 23 parts by weight [butyl mekkuri] Mixture of ethyl methacrylate copolymer and nitrocellulose at a ratio of 6.5:3.5 (weight ratio) (3) Colorant dianine: 12 parts by weight [1 sq. liter] The following mixture composition [ 2] was prepared.

Mixed composition [2] (1) 26 parts by weight of butyl cellosolve acetate (2) 26 parts by weight of butyl carpitol acetate (3) 8 parts by weight of butyl methacrylate (4) 20 parts by weight of dibutyl phthalate (5) 20 parts by weight of barium sulfate Transfer by pressure E-printing After cutting the transfer sheet described above into sheets, the activator according to the mixed composition [2] was applied to the printed pattern layer surface of the transfer sheet at 13 g/m2, and further, the water temperature was Float on a water surface at 30°C with the printed pattern layer surface coated with the activator facing upwards, and after 1 minute has passed, a polystyrene resin molded body for the outer frame of an air conditioner is pushed in from above, and the molded body is A transfer sheet was spread and brought into close contact with the surface.

Next, the polystyrene resin molded body on which the transfer sheet is spread and adhered is pulled out of the water, showered with warm water at 40°C for 30 minutes, and then showered with clear water to remove the polyvinyl alcohol resin film on the transfer sheet. was removed and then dried to obtain a polystyrene resin molded article having a printed pattern layer by transfer.

Example 2 An ABS resin molded article was subjected to transfer printing corresponding to the transfer printing process of Example 1 to obtain an ABS resin molded article having a printed pattern layer.

Comparative Example 1 Four types of printing inks with the following ink composition [3] containing cyanine blue, carbon, disazo yellow, and iron oxide as pigments were applied to the surface of a 40μ thick polyvinyl alcohol resin film of a transfer sheet. A printed pattern layer consisting of an abstract pattern was formed, and after drying, it was wound up with a winding roll to obtain a transfer sheet.

Ink composition [3] (11 Solvent Toluene 75 parts by weight (2) Binder component nitrocellulose 12 parts by weight alkyd resin 3 parts by weight (3) Pigment 10 parts by weight "Okidara" [Hodeda L] An activator having the following mixture composition [4] was prepared.

Mixed composition [4] (11 butyl cellosolve 13 parts by weight (2) 35 parts by weight of butylcarpitol acetate (3) 1 part by weight of nitrocellulose (4) 9 parts by weight of alkyd resin (5) Dibutyl phthalate...20 parts by weight ... 23 parts by weight - E Notification 1 After cutting the above transfer sheet into sheets, 5 g/w of the activator according to the mixed composition [4] was applied to the printed pattern layer surface of the transfer sheet. '', and then floated on the surface of water at a temperature of 30°C with the printed pattern layer side coated with the activator facing upwards, and after 1 minute had passed, the surface had been pre-coated with urethane-based paint as a brimer. A polystyrene resin molded body is pushed in from above, and a transfer sheet is spread on the surface of the molded body.

Closely attached.

Next, the polystyrene resin molded body with the transfer sheet spread and adhered to one surface was pulled out of the water and showered with warm water at 40°C for 30 minutes, and then further showered with clean water to remove the polyvinyl alcohol resin film on the transfer sheet. It was removed and then dried to obtain a polystyrene resin molded article having a printed pattern layer by transfer.

Comparative Example 2 Transfer printing corresponding to the transfer printing process of Comparative Example 1 was performed directly on the surface of an ABS resin molded article to obtain an ABS resin molded article having a printed pattern layer.

Comparative Example 3 Transfer printing corresponding to the transfer printing process of Comparative Example 1 was performed on a polystyrene resin molded body that had not been coated with a brimer, to obtain a polystyrene resin molded body having a printed pattern layer.

100 base stitches were formed on the molded bodies having printed horizontal layers obtained in Examples 1 to 2 and Comparative Examples 1 to 3 according to the base size test according to JISK-5400. After that,
A printed layer peeling test was conducted using cellophane tape (manufactured by Nichiban Co., Ltd. 1).

Table 1 shows the number of substrates in which the printed layer did not peel off in the peel test.

The molded bodies having the printed pattern layers obtained in Examples 1 to 2 and Comparative Examples 1 to 3 were each immersed in warm water at 40°C for 72 hours, then dried at room temperature for 24 hours, and then, A peel test was conducted using the formulation described in the initial adhesion test section above.

Table 1 shows the number of substrates in which no peeling occurred in the printed layer.

Table 1 [Operations and Effects of the Invention j The hydraulic pressure transfer printing method of the present invention involves floating a transfer sheet made of a water-soluble support having a printed pattern layer on its surface on a liquid surface, and activating the printed pattern layer. The printed pattern layer on the transfer sheet is activated by an agent, and then the printed pattern layer on the transfer sheet is applied to the transfer sheet by pressing a transfer object made of an ABS resin or polystyrene resin molding onto the transfer sheet from one side of the liquid surface. In this method, the printed pattern layer on the surface of the water-soluble support is transferred using a copolymer of butyl methacrylate and ethyl methacrylate or a mixed resin of the copolymer and nitrocellulose as a binder component, and methyl ethyl ketone and toluene. The printed pattern layer is formed using a printing ink using a mixed solvent, and an activator in which butyl methacrylate is dissolved is used as an activator for activating the printed pattern layer.

The hydraulic pressure transfer printing method of the present invention having the above-mentioned configuration can be applied to polystyrene, which conventionally could only be coated with a urethane paint or acrylic paint as a primer beforehand to form a printed pattern layer by transfer printing. For a resin molded body, even if the step of brimer coating is omitted, it is still possible to form a transfer printing 8I-like layer that exhibits a superior effect in terms of adhesion strength.

In addition, transfer printing can be performed directly on ABS resin molded objects, which conventionally can be directly transferred without applying a brimer coating with urethane paint or acrylic paint. However, it is possible to form a transfer printed pattern layer that exhibits an even better effect in terms of adhesion strength.

Claims (1)

[Claims] 1. A transfer sheet made of a water-soluble support having a printed pattern layer on its surface is floated on the liquid surface, the printed pattern layer is activated with an activator, and ABS resin or polystyrene resin is further activated. In a transfer printing method using hydraulic pressure in which a printed pattern layer on a transfer sheet is transferred to a transfer object by pressing a transfer object made of a molded object onto a transfer sheet from above the liquid surface, the water-soluble support is The printed pattern layer on the surface of the body is formed using a printing ink containing a copolymer of butyl methacrylate and ethyl methacrylate or a mixed resin of the copolymer and nitrocellulose as a binder component and methyl ethyl ketone and toluene as a solvent. Further, a transfer printing method using hydraulic pressure is characterized in that an activator in which butyl methacrylate is dissolved is used as an activator for activating the printed pattern layer.