CN103232752B - A kind of screen printing ink for UV paint surface and preparation method thereof - Google Patents

Abstract

The invention discloses a screen printing ink for a UV (ultraviolet) paint surface and a preparation method thereof. The ink comprises the following components in percentage by weight: 25-40% of polyester resin, 10-30% of modified polyester resin, 20-35% of solvent, 0.1-5% of dispersing agent and 0.1-5% of defoaming agent. The solvent used by the screen printing ink and preparation method thereof disclosed by the invention is environment-friendly and free of PAHs (polycyclic aromatic hydrocarbons); and after being baked at 80 DEG C for 60-90 minutes, the ink has the characteristics of excellent adhesive force, alcohol resistance, chemical resistance, wear resistance and the like on the UV paint surface product. The ink effectively overcomes the defects in the existing screen printing/transfer printing ink on the UV finish paint. The ink disclosed by the invention simplifies the decoration processing technique on the UV paint surface, enhances the production efficiency and greatly lowers the defective rate; and meanwhile, the invention provides more options for enriching the decoration scheme design of UV paint surface materials.

Description

A kind of screen printing ink for UV paint surface and preparation method thereof

technical field

The invention relates to silk screen printing ink, in particular to a two-component silk screen printing ink which is used on the surface of UV paint and has excellent wear resistance and chemical resistance properties.

Background technique

In industries such as mobile phones, car navigators, tablet computer casings, and telephone buttons, a layer of UV paint (ultraviolet-curable paint) is first sprayed on the surface of the parts, and then traditional UV inks (ultraviolet-curable inks) or traditional UV inks are used. The thermosetting ink is used for decoration or other processing on the UV paint layer. Although the traditional UV ink used can meet the requirements of high wear resistance, the traditional UV ink has the problem of unstable adhesion on some UV topcoats. If the traditional thermosetting ink is used, it cannot achieve high wear resistance, and the chemical resistance cannot meet the demand.

Therefore, the prior art still needs to be improved and developed.

Contents of the invention

In view of the above-mentioned deficiencies in the prior art, the object of the present invention is to provide a screen printing ink for UV paint surface and a preparation method thereof. The screen printing ink is a two-component ink with excellent wear resistance and chemical resistance , aiming to solve the problems of unstable adhesion and poor abrasion and chemical resistance of traditional inks on substrates coated with UV topcoats.

Technical scheme of the present invention is as follows:

A kind of screen printing ink for UV paint surface, wherein, by weight percentage, the ink comprises the following components:

Polyester resin 25-40;

Modified polyester resin 10-30;

Solvent 20-35;

Dispersant 0.1-5;

Defoamer 0.1-5.

The described screen printing ink for UV paint surface, wherein, by weight percentage, the ink also includes the following components:

Pigment 10-35.

The screen printing ink for the surface of UV paint, wherein, the polyester resin is a solid thermoplastic polyester resin, its solid content is greater than or equal to 35%, and its elongation is greater than or equal to 300%; The ester resin is a polyurethane elastomer modified polyester resin with a hydroxyl value of 50, a solid content of more than 99.5%, and a specific gravity of 1.28g/cm ³ .

The screen printing ink for the surface of UV paint, wherein the defoamer is a non-silicon defoamer.

The screen printing ink for the surface of UV paint, wherein, the dispersant is a macromolecule anchored super dispersant.

The screen printing ink for the surface of UV paint, wherein, the solvent is one or both of ketone solvents and alcohol ether solvents.

The screen printing ink for the surface of UV paint, wherein, the pigment is a halogen-free inorganic or organic environmental protection pigment.

The screen printing ink used on the surface of UV paint, wherein the viscosity of the screen printing ink used on the surface of UV paint is 25000CPS-35000CPS at room temperature of 25°C.

The described screen printing ink for UV paint surface, wherein, it is characterized in that, by weight percentage, this ink is made up of following components:

Polyester resin 38;

Modified polyester resin 16;

Solvent 25;

Pigment 18;

Dispersant 1.5;

Defoamer 1.5.

A kind of preparation method for the screen printing ink of UV paint surface as above, wherein, may further comprise the steps:

Take the solvent, polyester resin and modified polyester resin at normal temperature and pressure, stir at 600-1200r/min for 15-30 minutes to dissolve completely; add dispersant and pigment, stir evenly, grind to below 10цm; add defoaming agent, stir to disperse evenly.

Beneficial effects: the screen printing ink for UV paint surface provided by the present invention and its preparation method, the solvent used in it is environmentally friendly and free of PAHS; after baking at 80°C for 60-90min, the ink is on the surface of UV paint It has excellent adhesion, alcohol resistance, chemical resistance, abrasion resistance and other characteristics. The ink effectively overcomes the problems existing in the screen printing pad printing ink on the existing UV top coat. Adopting the ink provided by the present invention simplifies the process of decorating and processing the surface of UV paint, improves production efficiency, and greatly reduces the rate of defective products; meanwhile, it provides more options for enriching the design of decoration schemes for UV paint surface materials .

Detailed ways

The present invention provides a screen printing ink for UV paint surface and a preparation method thereof. In order to make the purpose, technical scheme and effect of the present invention clearer and clearer, the present invention will be further described in detail below. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

The invention provides a kind of screen printing ink for the surface of UV paint, which is a screen printing ink for decoration on the surface of UV paint. In terms of weight percentage, the ink is composed of the following components:

Polyester resin 25-40;

Modified polyester resin 10-30;

Solvent 20-35;

Pigment 10-35;

Dispersant 0.1-5;

Defoamer 0.1-5.

Specifically, the polyester resin is a solid thermoplastic polyester resin, its solid content is greater than or equal to 35%, and its elongation is greater than or equal to 300%; the modified polyester resin is a polyester modified acrylic resin ( XQ-7212Q, Mitsui Chemicals), has a hydroxyl value of 50, a solid content of more than 60%, and a specific gravity of 1.28g/cm ³ . Polyester resins provide excellent adhesion and acrylic resins provide excellent resistance.

The defoamer is a non-silicon defoamer; the dispersant is a polymer anchored super dispersant; the solvent is one or more of ketone solvents and alcohol ether solvents; the pigment is an inorganic Or organic environmentally friendly pigments, halogen-free; the solvent is one or more of ketone solvents or alcohol ether solvents, and the ketone solvents can be isophorone, cyclohexanone, methyl isobutyl ketone, etc. , the alcohol ether solvent can be hexanediol butyl ether, etc.; the UV topcoat is a coating formed by ultraviolet radiation curing.

The function of the solvent is to dissolve the resin and adjust the viscosity of the ink; the function of the defoamer is to eliminate and suppress the bubbles generated during the manufacture and use of the ink, and prevent the ink film from trachoma and pinholes; the function of the dispersant is to Helps the dispersion of pigments in the used system, significantly shortens the grinding time, improves gloss and tinting strength, and greatly improves the storage stability of the color paste.

The ink of the present invention has a viscosity of 25000-35000CPS at a room temperature of 25°C, and can be used for screen printing or pad printing, and has strong adhesion and high hardness of the paint film; it has excellent ethanol resistance, acid resistance, alkali resistance and aging resistance ; Excellent wear resistance, such as RCA wear test, rubber wear test, vibration wear test.

The silk screen printing ink that is used for the surface of UV paint, by weight percentage, is preferably made up of following components:

Polyester resin 38;

Modified polyester resin 16;

Solvent 25;

Pigment 18;

Dispersant 1.5;

Defoamer 1.5.

The screen printing ink for UV paint surface made of the above components has the best effect, moderate viscosity, best adhesion, alcohol resistance, chemical resistance, wear resistance and other characteristics.

The present invention also provides the preparation method of the screen printing ink for the UV paint surface, specifically comprising the following steps:

Take the solvent, polyester resin and modified polyester resin at normal temperature and pressure, and stir at 600-1200r/min for 15-30 minutes to dissolve completely, then add dispersant and pigment, stir evenly, and then pass through a three-roll machine for grinding When it is below 10цm, add defoamer, stir and disperse evenly, and then the finished product is obtained.

The ink of the present invention is a two-component ink, and a curing agent needs to be added before use, and can be used only after being mixed evenly. The isocyanate curing agent is an aliphatic isocyanate curing agent (the addition amount of the curing agent is 15%), and the solid content is 100%. The function of the curing agent is to improve the solvent resistance and abrasion resistance of the ink layer.

The following examples are further explanations and illustrations of the present invention and do not constitute any limitation to the present invention.

Example 1

Under normal temperature and pressure, take 20 parts (weight) of ketone solvent, 35 parts (weight) of polyester resin, 24 parts (weight) of modified polyester resin and stir at 600-1200r/min for 15-30 minutes to dissolve completely. Add 1.5 parts (weight) of dispersant, 18 parts (weight) of pigment, stir evenly, pass through a three-roller machine to grind to below 10цm, then add 1.5 parts (weight) of defoamer, stir and disperse evenly, and then the finished product is obtained.

Example 2

Under normal temperature and pressure, take 20 parts (weight) of ketone solvent, 30.5 parts (weight) of polyester resin, 28.5 parts (weight) of modified polyester resin and stir at 600-1200r/min for 15-30 minutes to dissolve completely. Add 1.5 parts (weight) of dispersant, 18 parts (weight) of pigment, stir evenly, pass through three-roll machine and grind to below 10цm, then add 1.5 parts (weight) of defoamer, 5 parts (weight) of alcohol ether solvent, stir After uniform dispersion, the finished product is obtained.

Above embodiment gained is used for the screen printing ink of UV varnish surface, after adding curing agent, pad printing thickness is 10μm on the surface of UV lacquer product, and ink printing effect and physical and chemical index state are shown in Table 1 on the material.

Table 1

Example 3

Under normal temperature and pressure, take 25 parts (weight) of alcohol ether solvent, 38 parts (weight) of polyester resin, 16 parts (weight) of modified polyester resin and stir at 600-1200r/min for 15-30 minutes to dissolve completely , add 1.5 parts (weight) of dispersant, 18 parts (weight) of pigment, stir evenly, pass through a three-roll machine to grind to below 10цm, then add 1.5 parts (weight) of defoamer, stir and disperse evenly, and then the finished product is obtained.

Example 4

Under normal temperature and pressure, take 30 parts (weight) of ketone solvent, 25 parts (weight) of polyester resin, 30 parts (weight) of modified polyester resin and stir at 600-1200r/min for 15-30 minutes to dissolve completely. Add 4.9 parts (weight) of dispersant and 10 parts (weight) of pigment, stir evenly, and grind it with a three-roller machine to less than 10μm, then add 0.1 part (weight) of defoamer, stir and disperse evenly, and then the finished product is obtained.

Example 5

Under normal temperature and pressure, take 35 parts (weight) of alcohol ether solvent, 40 parts (weight) of polyester resin, 10 parts (weight) of modified polyester resin and stir at 600-1200r/min for 15-30 minutes to dissolve completely , add 0.3 parts (weight) of dispersant, 10 parts (weight) of pigment, stir evenly, pass three-roll machine to grind to below 10цm, then add 4.7 parts (weight) of defoamer, stir and disperse evenly, and then the finished product is obtained.

Example 6

Under normal temperature and pressure, take 20 parts (weight) of ketone solvent, 27 parts (weight) of polyester resin, 13 parts (weight) of modified polyester resin and stir at 600-1200r/min for 15-30 minutes to dissolve completely. Add 2.5 parts (weight) of dispersant and 35 parts (weight) of pigment, stir evenly, and grind it with a three-roller machine to less than 10μm, then add 2.5 parts (weight) of defoamer, stir and disperse evenly, and then the finished product is obtained.

Above embodiment gained is used for the screen printing ink of UV varnish surface, after adding curing agent, pad printing thickness is 10μm on the surface of UV lacquer product, and printing effect and physical and chemical index state of printing ink on material are shown in Table 2.

Table 2

In the above examples, the solvents used are environmentally friendly and PAHS-free. After baking at 80°C for 60-90 minutes, the screen printing ink of the present invention has excellent adhesion, alcohol resistance, chemical resistance and wear resistance on UV paint surface products. and other characteristics; it effectively overcomes the existing problems of screen printing pad printing inks on the existing UV topcoat.

Adopt the screen printing ink that is used for the surface of UV paint provided by the present invention, can simplify the technology of the decoration processing on the surface of UV paint, improve production efficiency, greatly reduce the unqualified product rate; more choices.

It should be understood that those skilled in the art can make improvements or changes based on the above description, and all these improvements and changes should belong to the protection scope of the appended claims of the present invention.

Claims (2)

1. paint a surperficial ink for screen printing for UV, it is characterized in that, by weight percentage, this ink is composed of the following components:

Vibrin 38;

Modified polyester resin 16;

Solvent 25;

Pigment 18;

Dispersion agent 1.5;

Defoamer 1.5;

It is described that to paint the viscosity of surperficial ink for screen printing under 25 DEG C of room temperatures for UV be 25000-35000CPS;

Describedly paint surperficial ink for screen printing for UV and need before use to add solidifying agent, solidifying agent addition is 15%, mixes rear use;

Described solidifying agent is aliphatic isocyanates solidifying agent, and solid content is absolutely;

Described vibrin is solid thermoplastic vibrin, and its solids content is more than or equal to 35%, and elongation is more than or equal to 300%; Described modified polyester resin, its hydroxyl value is 50, Gu containing being greater than 99.5%, proportion is 1.28g/cm ³;

Described defoamer is non-silicon defoamer;

Described dispersion agent is the super dispersion agent of polymer grappling;

Described solvent is one or both of ketones solvent, alcohol ether solvent;

Described pigment is not halogen-containing inorganic or organic environmental-protection pigment;

Described ink also can be used for bat printing.

2. a preparation method who paints surperficial ink for screen printing for UV as claimed in claim 2, is characterized in that, comprises the following steps:

Under normal temperature and pressure, get solvent, vibrin and modified polyester resin, 600-1200r/min stirs 15-30 minute, and it is dissolved completely; Add dispersion agent and pigment, stir, be ground to below 10 ц m; Add defoamer, dispersed with stirring is even.