Aluminum plating protection ink for vacuum aluminum plating

Abstract

The invention discloses aluminizing protection ink for vacuum aluminizing. The aluminizing protection ink comprises a binder, a solvent, an auxiliary agent and a pigment, the connecting material is prepared from organic silicon modified polyurethane resin, fluorine-containing acrylate resin and hydroxyl-terminated polyester resin; the auxiliary agent comprises a phosphate adhesion promoter and a titanate coupling agent. The binder, the pigment and the solvent respectively account for 17.5-18.5%, 9-30% and 45-65% of the total mass of the ink in percentage by mass; the organic silicon modified polyurethane resin, the fluorine-containing acrylate resin and the hydroxyl-terminated polyester resin respectively account for 10-10.5%, 5.5-6% and 1.5-2% of the total mass of the ink in percentage by mass. Through organic combination of the binder, the solvent, the auxiliary agent and the pigment, the printing ink has excellent high temperature resistance, adhesive force and color stability, can completely replace a printing ink and protective gloss oil printing process adopted in the current industry, and improves the production efficiency and quality stability of the aluminum laminated film printing industry.

Description

Technical Field

[0001] The invention relates to the technical field of inks, and in particular to an aluminum plating protective ink for vacuum aluminum plating. Background Art

[0002] Vacuum aluminum plating is a process that uses resistance, high frequency or electron beam heating to melt and vaporize metal aluminum under high vacuum conditions (above 10-4mba) and adhere to the surface of the film substrate to form a composite film. Aluminum-plated film is formed when a very thin layer of metal aluminum is plated on the surface of a plastic film.

[0003] In order to make aluminum-plated packaging high-end, gorgeous and classy, ​​the market is increasingly using traditional processes: first printing ink, then vacuum aluminum plating---OPP, PET / / ink / protective varnish / / vacuum aluminum plating. Since traditional ink will change color after vacuum aluminum plating, a layer of protective varnish is covered on the surface of the ink. The advantage of using protective varnish is that it protects the ink from changing color during aluminum plating, improves interlayer adhesion, and enhances peeling strength. But the disadvantage is that varnish is a colorless transparent body, so it is difficult for the printing electric eye to track, so the printing quality of the protective varnish cannot be detected during high-speed printing, which leads to a high final scrap rate and greatly reduces production efficiency.

[0004] Therefore, it is imperative to develop an aluminum-plating protective ink for vacuum aluminum plating to replace traditional aluminum-plating protective varnish, and it has good market prospects. Summary of the invention

[0005] The purpose of the present invention is to provide an aluminum-plating protective ink for vacuum aluminum plating. Through the organic combination of binders, solvents, additives and pigments, the ink has excellent high temperature resistance, adhesion and color stability, completely replacing the current printing process of ink + protective varnish used in the industry, and improving the production efficiency and quality stability of the aluminum film printing industry.

[0006] In order to achieve the above object, the present invention provides the following technical solutions:

[0007] An aluminum plating protective ink for vacuum aluminum plating, characterized by comprising a connecting material, a solvent, an auxiliary agent and a pigment;

[0008] The connecting material is composed of silicone modified polyurethane resin, fluorine-containing acrylate resin and terminal hydroxyl polyester resin;

[0009] The auxiliary agent includes a phosphate adhesion promoter and a titanate coupling agent.

[0010] Preferably, the binder, pigment and solvent account for 17.5-18.5%, 9-30% and 45-65% of the total mass of the ink, respectively, in terms of mass percentage, and the remainder is additives.

[0011] Preferably, the organosilicon-modified polyurethane resin, fluorine-containing acrylate resin and hydroxyl-terminated polyester resin account for 10-10.5%, 5.5-6% and 1.5%-2% of the total mass of the ink, respectively, in terms of mass percentage.

[0012] Preferably, the silicone-modified polyurethane resin has a silicon content of ≥8% and a Tg of ≥160°C.

[0013] Preferably, the fluorine-containing acrylic resin is one or a combination of trifluoroethyl methacrylate (EFMA), hexafluorobutyl methacrylate (HFMA) and dodecafluoroheptyl methacrylate (DFMA).

[0014] Preferably, the hydroxyl-terminated polyester resin has a Tg of ≥60° C., a softening point of ≥140° C., a weight-average molecular weight of ≥20,000, and an OH value of ≥3.

[0015] Preferably, the solvent comprises n-propyl acetate and isopropyl alcohol.

[0016] Preferably, the auxiliary agent includes a phosphate adhesion promoter.

[0017] Preferably, the auxiliary agent includes a titanate coupling agent.

[0018] Preferably, the auxiliary agent includes UV-234 light stabilizer.

[0019] Preferably, the auxiliary agent includes nano-fumed titanium dioxide.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] The present invention adopts organosilicon-modified polyurethane resin as the main film-forming skeleton, and the organosilicon-modified siloxane

[0022] The chain segment improves the high temperature creep resistance of the ink, achieving good high temperature resistance and creep resistance; combined with fluorinated propylene

[0023] The fluorine element in the ester resin reduces the surface energy and improves the wettability of aluminum plating, and can avoid residual halogen during the aluminum plating process.

[0024] The corrosion of elemental gas; with terminal hydroxyl polyester resin, the terminal carboxyl group and the aluminum layer Al-O-Al chelate to form a chelate reaction.

[0025] Improve adhesion.

[0026] The ink of the present invention has excellent high temperature resistance through the organic combination of the binder, solvent, additive and pigment.

[0027] Temperature, adhesion and color stability, can completely replace the printing ink + protective varnish currently used in the industry

[0028] Process, improve the production efficiency and quality stability of the aluminized film printing industry. DETAILED DESCRIPTION

[0029] The present invention is further described below in conjunction with specific embodiments.

[0030] An aluminum plating protective ink for vacuum aluminum plating, the specific formulas of Examples 1 to 3 are shown in the following table:

[0031]

[0032]

[0033] The ink connecting material of the invention is composed of organosilicon-modified polyurethane resin, fluorine-containing acrylate resin and terminal hydroxyl polyester resin, the auxiliary agents include phosphate adhesion promoter, titanate coupling agent and light stabilizer, and the solvent is a mixed solvent.

[0034] Silicone-modified polyurethane resin is used as the main film-forming skeleton. The silicone-modified siloxane chain segment improves the high-temperature creep resistance of the ink, achieving good high-temperature resistance and creep resistance. The fluorine element in the fluorine-containing acrylate resin reduces the surface energy and improves the wettability of aluminum plating, and can avoid the corrosion of residual halogen gas during the aluminum plating process. It is combined with a terminal hydroxyl polyester resin to utilize the terminal carboxyl group to chelate with the aluminum layer Al-O-Al to improve adhesion.

[0035] The phosphoric acid group in the phosphate adhesion promoter forms an Al-OP covalent bond with the aluminum layer, increasing the binding energy and further improving the adhesion of the ink; the alkoxy group of the titanate coupling agent condenses with the resin hydroxyl group to form an organic-inorganic hybrid structure to improve the pigment sedimentation stability.

[0036] Furthermore, in the above formula: the organosilicon-modified polyurethane resin is used as the main high-temperature resistant film-forming agent to inhibit thermal decomposition and yellowing, and the silicon content is ≥8%, and Tg is ≥160°C.

[0037] Fluorinated acrylic resin improves surface smoothness and anti-adhesion, and meets the EU PFAS environmental protection requirements. Trifluoroethyl methacrylate (EFMA), hexafluorobutyl methacrylate (HFMA), N-methyl perfluorooctanesulfonylaminoethyl acrylate (OEFA), dodecafluoroheptyl methacrylate (DFMA), and hexafluorobutyl acrylate (BFA) can be used.

[0038] The hydroxyl-terminated polyester resin has a Tg of ≥60°C, a softening point of ≥140°C, a weight average molecular weight of ≥20,000, an OH value of ≥3, and has good adhesion to PET substrates.

[0039] The acid value of the phosphate adhesion promoter is 45 mgKOH / g, which enhances the adhesion of the aluminum plating layer. In this embodiment, the commercially available product Dispon i lAP100 is selected.

[0040] Dispersants allow the pigment to be fully wetted and dispersed to achieve a full wetting effect.

[0041] Polytetrafluoroethylene wax is environmentally friendly, its fluorine content meets European and American standards, and it has good scratch resistance.

[0042] Titanate coupling agent plays a cross-linking role in the ink, further improving the high temperature resistance and yellowing resistance, thereby improving the adhesion of the coating and resisting damage to the ink caused by vacuum aluminum plating.

[0043] Antistatic agent, eliminates static electricity during high-speed printing.

[0044] Nano-silicon dioxide has the advantages of good anti-adhesion, fast drying and good film-forming properties, making the printed products less likely to stick.

[0045] Light stabilizers are added to improve color stability. This embodiment uses UV-234, which can pass the GB9685 migration test (≤1.5 mg / kg) and FDA 21CFR 175.300 certification. The pigment is a high temperature resistant pigment.

[0046] The aluminum plating protective ink for vacuum aluminum plating prepared in the above method in Examples 1 to 3 was tested, and the performance index parameters are shown in the following table:

[0047]

[0048] The present invention organically combines the binder, solvent, additive and pigment to make the ink of the present invention have excellent high temperature resistance, adhesion and color stability, and can completely replace the printing process of ink + protective varnish currently used in the industry, thereby improving the production efficiency and quality stability of the aluminum film printing industry.

[0049] Unless otherwise specified, the raw materials used in the technical solution provided by the present invention are prepared by conventional means or purchased through commercial channels.

[0050] For those skilled in the art, various other corresponding changes and deformations can be made according to the technical solutions and concepts described above, and all of these changes and deformations should fall within the protection scope of the claims of the present invention.

Claims

1. An aluminum coating protective ink for vacuum aluminum coating, characterized in that: Including binders, solvents, additives and pigments; The connecting material is composed of silicone modified polyurethane resin, fluorine-containing acrylate resin and terminal hydroxyl polyester resin; The auxiliary agent includes a phosphate adhesion promoter and a titanate coupling agent.

2. The aluminum plating protective ink for vacuum aluminum plating according to claim 1, characterized in that: The linker, pigment and solvent respectively account for 17.5-18.5%, 9-30% and 45-65% of the total ink mass in terms of mass percentage, and the remainder is auxiliary agent.

3. The aluminum plating protective ink for vacuum aluminum plating according to claim 1, characterized in that: The organosilicon-modified polyurethane resin, fluorine-containing acrylate resin and terminal hydroxyl polyester resin account for 10-10.5%, 5.5-6% and 1.5%-2% of the total mass of the ink, respectively, in terms of mass percentage.

4. The aluminum plating protective ink for vacuum aluminum plating according to claim 1, characterized in that: The silicone-modified polyurethane resin has a silicon content of ≥8% and a Tg of ≥160°C.

5. The aluminum plating protective ink for vacuum aluminum plating according to claim 1, characterized in that: The fluorine-containing acrylic resin is one or a combination of trifluoroethyl methacrylate (EFMA), hexafluorobutyl methacrylate (HFMA) and dodecafluoroheptyl methacrylate (DFMA).

6. The aluminum plating protective ink for vacuum aluminum plating according to claim 1, characterized in that: The terminal hydroxyl polyester resin has a Tg of ≥60°C, a softening point of ≥140°C, a weight average molecular weight of ≥20,000, and an OH value of ≥3.

7. The aluminum plating protective ink for vacuum aluminum plating according to claim 1, characterized in that: The solvents include n-propyl acetate and isopropyl alcohol.

8. The aluminum plating protective ink for vacuum aluminum plating according to claim 1, characterized in that: The auxiliary agent includes a phosphate adhesion promoter.

9. The aluminum plating protective ink for vacuum aluminum plating according to claim 1, characterized in that: The auxiliary agent includes a titanate coupling agent.

10. The aluminum plating protective ink for vacuum aluminum plating according to claim 1, characterized in that: The auxiliary agent includes UV-234 light stabilizer and nano silicon dioxide.

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