CN111423754A

CN111423754A - Coating liquid for promoting UV ink adhesion and preparation method thereof

Info

Publication number: CN111423754A
Application number: CN202010353659.0A
Authority: CN
Inventors: 黄健彬; 刘明辉
Original assignee: TRENDVISION ELECTRONICS SCIENCE TECHNOLOGY (ZHUHAI) CO LTD
Current assignee: Zhuhai Chuanmeixun New Materials Co ltd
Priority date: 2020-04-29
Filing date: 2020-04-29
Publication date: 2020-07-17
Anticipated expiration: 2040-04-29
Also published as: CN111423754B

Abstract

The invention belongs to the field of materials, and discloses a coating liquid for promoting UV ink adhesion, which comprises a monomer, an adhesion auxiliary agent and a solvent; the monomer is at least one of trimethylolpropane formal acrylate, tetrahydrofuran acrylate, 2-phenoxyethyl acrylate, trimethylcyclohexyl acrylate, polyethylene glycol nonyl phenyl ether acrylate or ethoxylated trimethylolpropane triacrylate; the adhesion auxiliary agent is at least one of chlorinated polypropylene resin, modified acrylate or silane coupling agent. The coating liquid can form a continuous adhesion layer on the base material, so that the adhesion of the UV ink layer to the special base material is improved; because the UV ink does not contain a photoinitiator, the UV ink is high in stability, is not easily influenced by light or heat, and does not influence the stability of the UV ink; the coating liquid does not need to be completely dried after being coated, can be immediately subjected to UV ink-jet printing, is simple and convenient to operate, has high efficiency, and has good adaptability to various UV ink-jet inks and base materials.

Description

Coating liquid for promoting UV ink adhesion and preparation method thereof

Technical Field

The invention belongs to the field of materials, and particularly relates to coating liquid for promoting UV ink adhesion and a preparation method thereof.

Background

With the aging of UV ink jet printing technology and the advantages of low pollution, environmental protection, quick drying and the like of UV ink, various UV inks are presented in the market. The formula of the UV ink follows the smoothness principle of a printer, the problem of smooth printing of the UV ink on the printer is solved, and the requirement of the UV ink on the functionality of printing the UV ink on a substrate is met.

At present, most of UV ink on the market is selective to base materials, especially for base materials which are difficult to adhere, such as glass, metal, ceramic and the like, suitable UV ink is difficult to exist, the UV ink can meet the adhesion force, and the printing smoothness is not good; and the ink with good printing fluency has poor adhesive force. Because of the good adhesion of the materials, the stability of the UV ink may be severely affected and cannot be directly added to the ink formulation.

Therefore, it is desirable to provide a coating solution for promoting adhesion of UV ink, which can effectively combine the substrate and the UV ink layer tightly, and promote adhesion of the UV ink layer to a special substrate, such as glass, metal, ceramic or plastic.

Disclosure of Invention

The present invention is directed to solving at least one of the problems of the prior art described above. Therefore, the invention provides the coating liquid for promoting the adhesion of the UV ink, which can effectively and tightly combine the substrate and the UV ink layer and promote the adhesion of the UV ink layer to special substrates such as glass, metal, ceramic or plastic.

A coating liquid for promoting UV ink adhesion comprises a monomer, an adhesion auxiliary agent and a solvent; the adhesion auxiliary agent is at least one of chlorinated polypropylene resin, modified acrylate or silane coupling agent, and the monomer is at least one of cyclotrimethylolpropane methylal acrylate, tetrahydrofuran acrylate, 2-phenoxyethyl acrylate, trimethylcyclohexyl acrylate, polyethylene glycol nonylphenyl ether acrylate or ethoxylated trimethylolpropane triacrylate.

The monomer comprises cyclotrimethylolpropane methylal acrylate, tetrahydrofuran acrylate, 2-phenoxyethyl acrylate, trimethylcyclohexyl acrylate, polyethylene glycol nonylphenyl ether acrylate and ethoxylated trimethylolpropane triacrylate, and the monomer contains a ring or a long chain with an adhesive force structure, has good flexibility, good compatibility with the adhesive auxiliary agent, synergy and strong affinity to a base material; meanwhile, the coating liquid does not affect the stability of the UV ink.

Preferably, the coating liquid comprises, by mass, 50-100 parts of a solvent, 3-20 parts of a monomer and 5-30 parts of an adhesion aid; further preferably, the coating liquid comprises, by mass, 70-90 parts of a solvent, 3-15 parts of a monomer and 5-20 parts of an adhesion aid.

Preferably, the modified acrylate is at least one of modified epoxy acrylate, modified polyester acrylate or phosphoric acid modified acrylate. The adhesion promoter has strong affinity to the base material, and can generate acid-base adsorption, Vanderwatt adsorption, hydrogen bond adsorption or dipole adsorption and the like aiming at the base material. Wherein the phosphoric acid modified acrylate and the silane coupling agent can generate acid-base bonding or adsorption with the alkaline hydroxyl on the surfaces of glass, ceramics or metal and the like; chlorinated polypropylene resin can generate Vanderwatt adsorption on the nonpolar plastic base material; other polar substrates are subjected to dipolar or hydrogen bond adsorption with modified epoxy acrylates or modified polyester acrylates.

More preferably, the silane coupling agent is vinyltriethoxysilane, vinyltrimethoxysilane or vinyltris (β -methoxyethoxy) silane.

Preferably, the boiling point of the solvent is 40-150 ℃; further preferably, the boiling point of the solvent is 50-120 ℃; more preferably, the boiling point of the solvent is 60 to 100 ℃.

Preferably, the solvent is at least one of ethyl acetate, propyl acetate, ethanol, isopropanol, acetone, butanone, or propylene glycol methyl ether. The solvent has proper volatility, good solubility for the monomer and the adhesion auxiliary agent, good compatibility, can be used as a carrier of the monomer and the adhesion auxiliary agent, can wet a substrate and forms a continuous adhesion layer on the substrate; but also can volatilize in the printing process, the function of the coating can not be influenced, and the coating can be adopted to carry out UV ink-jet printing without complete drying after coating.

The invention also provides a preparation method of the UV ink adhesion promoting coating liquid, which comprises the following steps:

mixing the monomer, the adhesion auxiliary agent and the solvent, dissolving, filtering, and taking the filtrate to obtain the coating liquid.

Specifically, the preparation method of the coating liquid comprises the following steps:

pouring the monomer, the attachment auxiliary agent and the solvent into a stirring tank, and stirring until the monomer, the attachment auxiliary agent and the solvent are completely dissolved; then filtering with 1.0 μm glass fiber filter membrane and 0.45 μm PP filter membrane, and taking the filtrate as the coating liquid.

The thickness of the wet film of the UV ink coating is 30-80 um.

Compared with the prior art, the invention has the following beneficial effects:

(1) the coating liquid is prepared from a monomer, an attachment auxiliary agent and a solvent, and the components are simple and easy to obtain; the monomer contains a ring or a long chain with an adhesive force structure, has good flexibility and good compatibility with the adhesive auxiliary agent; the adhesion auxiliary agent has strong affinity to the base material and can generate acid-base adsorption, Vanderwatt adsorption, hydrogen bond adsorption or dipole adsorption and the like aiming at the base material; the UV ink and the UV ink can be synergized, the base material and the UV ink layer are effectively and tightly combined, the adhesive force of the UV ink layer to special base materials such as glass, metal, ceramic or plastic is improved, and the adhesive force of the UV ink on the base materials can reach the level of more than the national standard GB9286 and ISO2409 standard 1.

(2) The coating liquid forms a continuous adhesion layer on a substrate, and the stability of the coating liquid is high due to the fact that no photoinitiator is added, and the coating liquid is not easily affected by light or heat and does not affect the stability of UV ink.

(3) The coating liquid does not need to be completely dried after being coated, can be immediately subjected to UV ink-jet printing, is simple and convenient to operate, has high efficiency, and has good adaptability to various UV ink-jet inks and base materials.

Detailed Description

In order to make the technical solutions of the present invention more apparent to those skilled in the art, the following examples are given for illustration. It should be noted that the following examples are not intended to limit the scope of the claimed invention.

The starting materials, reagents or apparatuses used in the following examples are conventionally commercially available or can be obtained by conventionally known methods, unless otherwise specified.

Example 1

Pouring 70g of ethyl acetate as a solvent, 10g of cyclotrimethylolpropane methylal acrylate as a monomer, 5g of polyethylene glycol nonylphenyl ether acrylate as an adhesion aid, 7g of modified epoxy acrylate as an adhesion aid, 5g of phosphoric acid modified acrylate and 3g of chlorinated polypropylene resin into a stirring tank, and stirring until the components are completely dissolved; then filtering with a 1.0 μm glass fiber filter membrane and a 0.45 μm PP filter membrane to obtain the coating liquid.

Example 2

Pouring 50g of ethyl acetate, 30g of propylene glycol methyl ether, 3g of monomer ethoxylated trimethylolpropane triacrylate, 7g of trimethylcyclohexyl acrylate, 5g of adhesion aid, 5g of silane coupling agent and 5g of chlorinated polypropylene resin into a stirring tank, and stirring until the materials are completely dissolved; then filtering with a 1.0 μm glass fiber filter membrane and a 0.45 μm PP filter membrane to obtain the coating liquid.

Example 3

Pouring 20g of isopropanol, 60g of propyl acetate, 5g of 2-phenoxyethyl acrylate as a monomer, 5g of modified epoxy acrylate as an adhesion aid, 5g of silane coupling agent and 5g of chlorinated polypropylene resin into a stirring tank, and stirring until the components are completely dissolved; then filtering with a 1.0 μm glass fiber filter membrane and a 0.45 μm PP filter membrane to obtain the coating liquid.

Example 4

Pouring 45g of propylene glycol methyl ether, 45g of propyl acetate, 5g of tetrahydrofuran acrylate as a monomer, 3g of phosphoric acid modified acrylate as an adhesion aid and 2g of chlorinated polypropylene resin into a stirring tank, and stirring until the components are completely dissolved; then filtering with a 1.0 μm glass fiber filter membrane and a 0.45 μm PP filter membrane to obtain the coating liquid.

Example 5

Pouring 20g of ethyl acetate, 50g of propyl acetate, 3g of 2-phenoxyethyl acrylate as a monomer, 10g of modified epoxy acrylate as an adhesion aid, 5g of phosphoric acid modified acrylate and 5g of chlorinated polypropylene resin into a stirring tank, and stirring until the components are completely dissolved; then filtering with a 1.0 μm glass fiber filter membrane and a 0.45 μm PP filter membrane to obtain the coating liquid.

Example 6

Pouring 50g of propylene glycol methyl ether, 30g of isopropanol, 5g of cyclotrimethylolpropane methylal acrylate as a monomer, 5g of modified epoxy acrylate as an adhesion aid, 5g of silane coupling agent and 5g of chlorinated polypropylene resin into a stirring tank, and stirring until the materials are completely dissolved; then filtering with a 1.0 μm glass fiber filter membrane and a 0.45 μm PP filter membrane to obtain the coating liquid.

TABLE 1 raw material ratios of examples 1-6

Comparative example 1

Pouring 70g of ethyl acetate as a solvent and 30g of cyclotrimethylolpropane methylal acrylate as a monomer into a stirring tank, and stirring until the materials are completely dissolved; then filtering with a 1.0 μm glass fiber filter membrane and a 0.45 μm PP filter membrane to obtain the coating liquid.

Comparative example 2

Comparative example 2 differs from example 5 in that 2-phenoxyethyl acrylate is not included, and the remaining starting materials and preparation method are the same as in example 5.

Comparative example 3

Comparative example 3 is different from example 5 in that methyl methacrylate is used instead of 2-phenoxyethyl acrylate, and the remaining raw materials and preparation method are the same as example 5.

Product effectiveness testing

Adhesion test and coating liquid performance test:

the preparation method of the adhesion test sample comprises the following steps: the UV ink adhesion promoting coating liquid prepared in the examples 1 to 6 and the comparative examples 1 to 3 is respectively and uniformly coated on the surfaces of printing base materials such as acrylic, glass, metal, polypropylene and the like by using a #60 wire rod, the thickness of the coating is about 60 mu m, and the coated surfaces are printed by UV ink. Comparative example 4 is a blank control, and UV ink printing was performed with a substrate to which the coating liquid was not applied.

The adhesion test adopts national standard GB9286 and ISO2409 standard, a hundred grids are drawn on a base material printed with UV ink by using a hundred-grid cutter, a qualified test method is achieved only when a cutting part needs to be scraped to the bottom of the base material, ink scraps are removed by using a brush, then an adhesive tape is used for adhering the hundred grids and is pulled upwards at 90 degrees, and whether the edge of the hundred-grid cutter is cracked or broken is observed. The adhesive force is graded as good or bad, wherein the grade 0 represents that the cut of the hundred-grid cutter is smooth and has no spalling or crevasse; grade 1 represents 5% of the cut of the hundred-grid knife is peeled or broken; grade 2 represents 5-15% of the cut of the hundred-grid knife is stripped or broken; grade 3 represents 15-35% of the cut of the hundred-grid knife is stripped or broken; grade 4 represents 35-65% of the cuts of the hundred-grid knife are peeled or broken; grade 5 represents a cleft or break of 65% or more of the cut of the hundred grid knife.

Table 2 results of adhesion test for blanks of examples 1-6 and comparative examples 1-4

As can be seen from the test results in Table 2, examples 1-6 all showed good adhesion between 0 and 1 on the corresponding test substrates printed with the same inks. Comparative example 1 no adhesion aid was added, and the adhesion of the UV ink on the substrate was 2-5; comparative example 2 without the addition of the monomer, the UV ink also adhered far less well to the substrate than example 5; comparative example 3 replacement of 2-phenoxyethyl acrylate with methyl methacrylate, the UV ink also had much less adhesion to the substrate than example 5; comparative example 4 was printed directly with the same ink on the same substrate without the coating fluid, and adhesion was much worse than the examples and was not as desired.

Claims

1. The coating liquid for promoting the adhesion of the UV ink is characterized by comprising a monomer, an adhesion auxiliary agent and a solvent; the monomer is at least one of trimethylolpropane formal acrylate, tetrahydrofuran acrylate, 2-phenoxyethyl acrylate, trimethylcyclohexyl acrylate, polyethylene glycol nonyl phenyl ether acrylate or ethoxylated trimethylolpropane triacrylate; the adhesion auxiliary agent is at least one of chlorinated polypropylene resin, modified acrylate or silane coupling agent.

2. The coating solution of claim 1, comprising 50-100 parts by mass of a solvent, 3-20 parts by mass of a monomer, and 5-30 parts by mass of an adhesion promoter.

3. The coating solution of claim 2, comprising 70-90 parts by mass of a solvent, 3-15 parts by mass of a monomer, and 5-20 parts by mass of an adhesion promoter.

4. The coating liquid according to claim 1, wherein the modified acrylate is at least one of a modified epoxy acrylate, a modified polyester acrylate, or a phosphoric acid-modified acrylate.

5. The coating solution of claim 1, wherein the silane coupling agent is at least one of vinyltriethoxysilane, vinyltrimethoxysilane, or vinyltris (β -methoxyethoxy) silane.

6. The coating solution according to any one of claims 1 to 3, wherein the solvent has a boiling point of 40 to 150 ℃.

7. The coating solution according to claim 6, wherein the solvent is at least one of ethyl acetate, propyl acetate, ethanol, isopropanol, acetone, methyl ethyl ketone, and propylene glycol methyl ether.

8. The method for preparing a coating liquid according to any one of claims 1 to 7, comprising the steps of:

9. A UV ink coating comprising the coating liquid according to any one of claims 1 to 7.

10. The UV ink coating according to claim 9, wherein the wet film of the UV ink coating has a thickness of 30-80 um.