CN-121975373-A - Aqueous ink for PVC wood grain paper and application method thereof

Abstract

The invention provides water-based ink for PVC wood grain paper and an application method thereof, wherein the water-based ink for PVC wood grain paper comprises, by mass, 1% -5.5% of a colorant, 2.5% -12% of hot-melt polyurethane, 3% -9% of acrylic resin and 3% -5% of isocyanate, the acid value of the hot-melt polyurethane is 15-30 mgKOH/g, and the acid value of the acrylic resin is 15-60 mgKOH/g. The ink realizes ultrahigh and durable adhesive force on PVC wood grain paper, has strong stripping force with a protective film, keeps good printing smoothness, and effectively resists intrinsic aging factors such as plasticizer migration and the like.

Inventors

• Xu Luzhen
• ZENG ZHENYU

Assignees

• 珠海天威科创新材料有限公司

Dates

Publication Date

20260505

Application Date

20260126

Claims (10)

1. 1. An aqueous ink for PVC wood grain paper, which is characterized in that: the water-based ink for PVC wood grain paper comprises, by mass, 1% -5.5% of a colorant, 2.5% -12% of hot-melt polyurethane, 3% -9% of acrylic resin and 3% -5% of isocyanate, wherein the acid value of the hot-melt polyurethane is 15-30 mgKOH/g, and the acid value of the acrylic resin is 15-60 mgKOH/g.
2. 2. An aqueous ink for PVC wood grain paper as in claim 1, wherein: The acid value difference between the acrylic resin and the hot melt polyurethane is 10-45 mgKOH/g.
3. 3. An aqueous ink for PVC wood grain paper as in claim 1, wherein: The D50 particle size of the hot melt polyurethane is 50-200 nm, and the D50 particle size of the acrylic resin is 50-150 nm.
4. 4. An aqueous ink for PVC wood grain paper as in claim 1, wherein: The glass transition temperature of the hot melt polyurethane is-50-0 ℃, and the glass transition temperature of the acrylic resin is 5-55 ℃.
5. 5. An aqueous ink for PVC wood grain paper as in claim 1, wherein: the activation temperature of the hot melt polyurethane is 120-160 ℃.
6. 6. An aqueous ink for PVC wood grain paper as in claim 1, wherein: the isocyanate is a blocked isocyanate.
7. 7. An aqueous ink for PVC wood grain paper as in claim 1, wherein: the water-based ink for PVC wood grain paper further comprises 10% -25% of organic solvent according to mass percentage, wherein the organic solvent is selected from polyalcohol and/or polyalcohol alkyl ether solvents.
8. 8. An aqueous ink for PVC wood grain paper as in claim 1, wherein: The water-based ink for PVC wood grain paper further comprises 0.5% -5% of an auxiliary agent, wherein the auxiliary agent comprises a surfactant, and the surfactant is selected from acetylenic diol surfactants and/or organic silicon surfactants; the surfactant accounts for 0.5-3% of the total ink by mass percent.
9. 9. A method of using the aqueous ink for PVC wood grain paper according to any one of claims 1 to 8, comprising the steps of: S1, printing a set pattern on a blank PVC film by using water-based ink of PVC wood grain paper by using a digital ink-jet printer according to the set pattern; s2, heating and drying the printed PVC film; and S3, covering a transparent decorative film on the dried PVC film, and attaching the decorative film to the PVC film through hot pressing to obtain the PVC wood grain paper.
10. 10. The application method of the aqueous ink for PVC wood grain paper as claimed in claim 9, wherein: In the step S2, the drying temperature is 100-120 ℃ and the drying time is 100-120S; and in the step S3, the hot pressing temperature is 140-180 ℃ and the hot pressing time is 100-180S.

Description

Aqueous ink for PVC wood grain paper and application method thereof Technical Field The invention relates to the field of ink-jet printing, in particular to an aqueous ink for PVC wood grain paper and an application method thereof. Background In the fields of interior decoration, furniture veneering and the like, PVC wood grain paper becomes an important decorative material for replacing natural wood by virtue of the advantages of controllable cost, convenient processing and capability of simulating various wood textures. With the continuous upgrading of consumers on the demands of individuation and high-simulation wood grain patterns, the digital ink-jet printing technology gradually becomes a mainstream production process of PVC wood grain paper because high-precision and multi-color-domain patterns can be directly output. However, the special physicochemical properties of smooth and dense surface, strong chemical inertness of PVC substrates, and the inclusion of easily migrating plasticizers such as phthalates in the interior, all present serious challenges for the suitability of printing inks. When the conventional universal ink (comprising aqueous type, solvent type and traditional weak solvent type) is directly applied to the preparation of PVC wood grain paper, the following key defects generally exist: first, the adhesion is insufficient. PVC is a non-absorptive substrate, a resin system of the general aqueous pigment ink is difficult to form effective chemical bonding or mechanical embedding with the surface of the resin system, daily friction is difficult to resist only by physical spreading, the printed pattern is easy to wear, scratch and the like, and the service life of the product is seriously influenced; And secondly, the weather resistance and the stability are poor. Patterns of the universal ink are easy to undergo photo-oxidative degradation to fade under long-term irradiation of ultraviolet rays, and an ink layer can be deformed or stripped from a base material under a high-temperature environment due to thermal stress, so that long-term use requirements of indoor and outdoor complex environments can not be met; Thirdly, the risk of plasticizer migration is high. The plasticizer in the PVC substrate can gradually migrate to the surface along with time, and the resin of the common ink layer is insufficient in oil resistance/plasticizer resistance and is easily damaged by the plasticizer, so that patterns are blurred, sticky or fall off, and the appearance quality of the product is greatly reduced; Fourth, the environmental protection performance does not reach the standard. The traditional solvent-based ink depends on high-Volatility Organic Compounds (VOC) as solvents, thereby not only threatening the health of operators and polluting the environment in the production process, but also being difficult to meet the environment-friendly requirements of modern households on low VOC and no peculiar smell, the weak solvents still contain a certain amount of VOC, have potential corrosion risks on production environments and equipment spray heads, and the environment-friendly grade of finished products still has room for improvement, while the aqueous ink has better environmental protection, but is difficult to be directly applied due to the problems of adhesion and stability; Fifth, the ornamental expressive force is limited. The universal ink is difficult to reproduce the fine gradation and three-dimensional texture of natural wood, and the ink film of the universal ink is possibly mismatched with the subsequent embossing process; And sixthly, the stripping force between the printed pattern layer and the protective film is too small. The aqueous resin used in the general aqueous pigment ink cannot adhere to the protective film, and the protective film is easily peeled off. The hot-melt resin is added into the water-based pigment ink, so that the water-based pigment ink is extremely easy to settle and unstable in state, and is easy to form a crust and block at a nozzle because of too fast water volatilization, so that the requirements of high peeling force and excellent printing smoothness cannot be met at the same time. Therefore, how to print on PVC materials by using aqueous pigment ink to achieve high adhesion and solve the contradiction problem between strong peeling force and excellent printing smoothness is a key point of the development content at present. Disclosure of Invention The first object of the invention is to provide an aqueous ink for PVC wood grain paper, which is used for solving the problems of poor adhesive force, environmental protection, poor printing fluency and low stripping force of the existing ink for PVC wood grain paper. The second object of the invention is to provide an application method of the water-based ink for PVC wood grain paper, wherein the water-based ink for PVC wood grain paper is the water-based ink for PVC wood grain paper. In order to achieve the