阅读说明：本技术 一种可碱洗铝箔印刷油墨及制备方法 (Aluminum foil printing ink capable of being washed by alkali and preparation method thereof ) 是由 何良 麻晗 于 2021-09-08 设计创作，主要内容包括：本发明属于油墨技术领域,特别涉及一种铝箔用可碱洗油墨及制备方法,其组成成份和重量份是：硝酸纤维素5～10份、醋酸纤维素1-15份、马来酸改性松香树脂1～15份、环氧树脂1-5份、颜料8～30份、蜡粉1～3份、助剂2～8份、无水乙醇5～25份、异丙醇2～15份、醋酸乙酯10～30份、醋酸正丙酯2～20份、成膜剂0.5-2.5份。本发明油墨配方铝箔附着优异、耐水耐磨,具有优异的可碱洗性,适用于回收再生啤酒瓶的铝箔标签印刷。(The invention belongs to the technical field of printing ink, and particularly relates to alkaline washable printing ink for an aluminum foil and a preparation method thereof, wherein the alkaline washable printing ink comprises the following components in parts by weight: 5-10 parts of cellulose nitrate, 1-15 parts of cellulose acetate, 1-15 parts of maleic acid modified rosin resin, 1-5 parts of epoxy resin, 8-30 parts of pigment, 1-3 parts of wax powder, 2-8 parts of auxiliary agent, 5-25 parts of absolute ethyl alcohol, 2-15 parts of isopropanol, 10-30 parts of ethyl acetate, 2-20 parts of n-propyl acetate and 0.5-2.5 parts of film forming agent. The ink formula disclosed by the invention has the advantages of excellent aluminum foil adhesion, water resistance, wear resistance and excellent alkaline washability, and is suitable for printing aluminum foil labels of recycled beer bottles.)

1. An aluminum foil printing ink capable of being washed by alkali is characterized in that: the composition comprises the following components in parts by weight: 5-10 parts of cellulose nitrate, 1-15 parts of cellulose acetate, 1-15 parts of maleic acid modified rosin resin, 1-5 parts of epoxy resin, 8-30 parts of pigment, 1-3 parts of wax powder, 2-8 parts of auxiliary agent, 5-25 parts of absolute ethyl alcohol, 2-15 parts of isopropanol, 10-30 parts of ethyl acetate, 2-20 parts of n-propyl acetate and 0.5-2.5 parts of film forming agent.

2. The alkali-washable aluminum foil printing ink as set forth in claim 1, wherein: the cellulose nitrate was a civilian paint cellulose nitrate with viscosity specifications of 1/2 seconds, 1/4 seconds, 1/8 seconds, and 1/16 seconds.

3. The alkali-washable aluminum foil printing ink as set forth in claim 1, wherein: the cellulose acetate is cellulose acetate butyrate and cellulose acetate propionate.

4. The alkali-washable aluminum foil printing ink as set forth in claim 1, wherein: the acid value of the maleic acid modified rosin resin is 20-50 mgKOH/g.

5. The alkali-washable aluminum foil printing ink as set forth in claim 1, wherein: the epoxy resin is liquid epoxy resin with the epoxy equivalent of 230-270 g/eg.

6. The alkali-washable aluminum foil printing ink as set forth in claim 1, wherein: the pigment comprises an organic pigment, titanium dioxide and carbon black.

7. The alkali-washable aluminum foil printing ink as set forth in claim 1, wherein: the wax powder contains one or more of oleamide, erucamide, behenamide, stearic acid amide, polyethylene wax and polytetrafluoroethylene wax.

8. The alkali-washable aluminum foil printing ink as set forth in claim 1, wherein: the auxiliary agent comprises one or more of a dispersing agent, a slip agent, a defoaming agent, a flatting agent, a coupling agent and an anti-settling agent.

9. The alkali-washable aluminum foil printing ink as set forth in claim 1, wherein: the film forming agent comprises one or more of propylene glycol monoethyl ether, dipropylene glycol monomethyl ether and diethylene glycol monobutyl ether.

10. A method for preparing an alkali-washable aluminum foil printing ink as defined in any one of claims 1 to 9, characterized in that: the method comprises the following steps:

A. resin dissolution: adding the cellulose nitrate into a mixed solvent of absolute ethyl alcohol and ethyl acetate while stirring, wherein the ratio of the absolute ethyl alcohol to the ethyl acetate is 1: 2-2: 1, the cellulose nitrate accounts for 25-40% of the total amount of the resin liquid, and the cellulose nitrate is completely dissolved uniformly for later use; adding cellulose acetate into ethyl acetate or n-propyl acetate under stirring, wherein the cellulose acetate accounts for 15-25% of the total amount of the resin solution, and dissolving completely and uniformly for later use; adding maleic acid modified rosin resin into ethyl acetate or n-propyl acetate while stirring, wherein the maleic acid modified rosin resin accounts for 40-50% of the total amount of the resin solution, and is completely and uniformly dissolved for later use;

B. preparing wax slurry: mixing part of wax powder and the cellulose nitrate solution, uniformly stirring, and finally stirring for more than 30 minutes by using a high-speed emulsifier, wherein the dispersion fineness of the wax powder is less than or equal to 20 micrometers under the action of high shear force, and the wax powder accounts for 15-30% of the wax slurry;

C. preparing color paste: uniformly stirring and mixing required pigment powder, an auxiliary agent and cellulose nitrate, adding wax powder, and pre-dispersing for more than 30 minutes by using a high-speed dispersion stirrer, wherein a solvent is used for regulating the viscosity; after the pre-dispersion is finished, repeatedly grinding by using a sand mill until the fineness is less than or equal to 20 micrometers, and finishing the color paste preparation;

D. a hardening and tempering process: on the basis of the prepared color paste, adding a maleic acid modified rosin resin solution and liquid epoxy resin step by step, and adding a solvent to adjust the color concentration, the viscosity and the drying speed;

E. performance adjustment: on the basis of the printing ink, wax slurry, an auxiliary agent and a film forming agent are added, so that the adhesion fastness, the friction resistance, the smoothness, the blister resistance, the flexibility and the tension resistance of the printing ink all accord with the design indexes;

F. quality testing, filtering and packaging.

Technical Field

The invention relates to the technical field of printing ink, and mainly relates to alkaline washable aluminum foil printing ink and a preparation method thereof.

Background

Most of the glass bottles of beer (or other glass bottled beverages) on the market at present need to be recycled, and the recycled wine bottles need to be sterilized, washed and de-labeled before being canned again. The general cleaning solution adopts 1.5-2.5% of sodium hydroxide solution, the temperature is about 60-85 ℃, under the washing of the solution, the label can be eluted, meanwhile, the metal aluminum foil in the label can be quickly dissolved by alkali liquor, ink printed on the aluminum foil loses an adhesive substrate, a part of ink fragments flow into a bottle along with the alkali liquor, if the ink fragments are adhered to the inner wall of the bottle, the ink fragments are difficult to completely wash out by subsequent clear water washing, and therefore the pollution of filled beer (or beverage) can be caused, and the quality of the product and the enterprise image are seriously influenced.

If the glass bottle is washed, the ink on the aluminum foil label can realize quick penetration of alkali liquor and quick decomposition into invisible and harmless components, so that the bottle is prevented from being polluted. Meanwhile, the printing ink components decomposed in the alkali liquor can be flocculated and precipitated again after the alkali liquor is cooled, and can be removed through filtration, and the color of the printing ink can not be remained in the filtered alkali liquor, so that the filtered alkali liquor can be recycled, and the problems can be effectively solved.

The present alkali washable aluminum foil printing ink was invented against such a background.

Disclosure of Invention

The invention aims to solve the problem of ink pollution of aluminum foil label ink in the alkali washing link of a glass bottle, and provides the alkali-washable aluminum foil printing ink and the preparation method.

The object of the present invention is achieved by the following technical means. The alkali-washable aluminum foil printing ink comprises the following components in parts by weight: 5-10 parts of cellulose nitrate, 1-15 parts of cellulose acetate, 1-15 parts of maleic acid modified rosin resin, 1-5 parts of epoxy resin, 8-30 parts of pigment, 1-3 parts of wax powder, 2-8 parts of auxiliary agent, 5-25 parts of absolute ethyl alcohol, 2-15 parts of isopropanol, 10-30 parts of ethyl acetate, 2-20 parts of n-propyl acetate and 0.5-2.5 parts of film forming agent.

The cellulose nitrate and cellulose acetate are used as main dispersion resins of pigment powder in the ink, and these resins are mixed with the pigment and then ground and dispersed by using a sand mill. After the dispersion is finished, a certain amount of maleic acid modified rosin resin with the acid value of 20-50(mgKOH/g) is added, so that the ink can be subjected to adjustable saponification reaction and hydrolysis reaction in an alkaline environment, and the basic alkaline washable capability of the ink is realized. Finally, the liquid epoxy resin with the epoxy equivalent of 230-270(g/eg), wax, an auxiliary agent and a film-forming agent are used for regulating the film performance of the ink, so that the basic performances of the ink such as adhesion fastness, friction resistance, smoothness, bubble resistance, flexibility, tension resistance and the like are guaranteed.

Before use, the above resins are dissolved in advance into resin solution by using absolute ethyl alcohol, isopropanol, ethyl acetate and n-propyl acetate solvents.

The cellulose nitrate was a civilian paint cellulose nitrate with viscosity specifications of 1/2 seconds, 1/4 seconds, 1/8 seconds, and 1/16 seconds.

The cellulose acetate is cellulose acetate butyrate and cellulose acetate propionate.

The acid value of the maleic acid modified rosin resin is 20-50 mgKOH/g.

The epoxy resin is liquid epoxy resin with the epoxy equivalent of 230-270 g/eg.

The pigment comprises an organic pigment, titanium dioxide and carbon black.

The wax powder contains one or more of oleamide, erucamide, behenamide, stearic acid amide, polyethylene wax and polytetrafluoroethylene wax.

The auxiliary agent comprises one or more of a dispersing agent, a slip agent, a defoaming agent, a flatting agent, a coupling agent and an anti-settling agent.

The film forming agent comprises one or more of propylene glycol monoethyl ether, dipropylene glycol monomethyl ether and diethylene glycol monobutyl ether.

The invention also discloses a preparation method of the alkali-washable aluminum foil printing ink, which comprises the following steps:

A. resin dissolution: adding the cellulose nitrate into a mixed solvent of absolute ethyl alcohol and ethyl acetate while stirring, wherein the ratio of the absolute ethyl alcohol to the ethyl acetate is 1: 2-2: 1, the cellulose nitrate accounts for 25-40% of the total amount of the resin liquid, and the cellulose nitrate is completely dissolved uniformly for later use; adding cellulose acetate into ethyl acetate or n-propyl acetate under stirring, wherein the cellulose acetate accounts for 15-25% of the total amount of the resin solution, and dissolving completely and uniformly for later use; adding maleic acid modified rosin resin into ethyl acetate or n-propyl acetate while stirring, wherein the maleic acid modified rosin resin accounts for 40-50% of the total amount of the resin solution, and is completely and uniformly dissolved for later use;

B. preparing wax slurry: mixing part of wax powder and the cellulose nitrate solution, uniformly stirring, and finally stirring for more than 30 minutes by using a high-speed emulsifier, wherein the dispersion fineness of the wax powder is less than or equal to 20 micrometers under the action of high shear force, and the wax powder accounts for 15-30% of the wax slurry;

C. preparing color paste: uniformly stirring and mixing required pigment powder, an auxiliary agent and cellulose nitrate, adding wax powder, and pre-dispersing for more than 30 minutes by using a high-speed dispersion stirrer, wherein a solvent is used for regulating the viscosity; after the pre-dispersion is finished, repeatedly grinding by using a sand mill until the fineness is less than or equal to 20 micrometers, and finishing the color paste preparation;

D. a hardening and tempering process: on the basis of the prepared color paste, adding a maleic acid modified rosin resin solution and liquid epoxy resin step by step, and adding a solvent to adjust the color concentration, the viscosity and the drying speed;

E. performance adjustment: on the basis of the printing ink, wax slurry, an auxiliary agent and a film forming agent are added, so that the adhesion fastness, the friction resistance, the smoothness, the blister resistance, the flexibility and the tension resistance of the printing ink all accord with the design indexes;

F. quality testing, filtering and packaging.

The invention has the beneficial effects that: the invention effectively solves the problem of ink pollution of the aluminum foil label ink in the alkali washing link of the glass bottle, ensures that the quick alkali liquor penetration and quick decomposition can be realized on the premise of ensuring the excellent adhesion fastness of the ink on an aluminum foil substrate, can be completely flocculated and filtered after the alkali liquor is cooled, and simultaneously ensures that the filtered alkali liquor has no color pollution, thereby realizing the excellent alkali washing function.

Detailed Description

The present invention will be described in detail with reference to the following examples:

the formula and the process of the invention comprise the following steps:

(1) dissolution of the resin

Dissolving cellulose nitrate: adding 1/2 seconds, 1/4 seconds, 1/8 seconds and 1/16 seconds of civil coating cellulose nitrate into a mixed solvent of absolute ethyl alcohol and ethyl acetate while stirring, wherein the ratio of the absolute ethyl alcohol to the ethyl acetate is 1: 2-2: 1, the cellulose nitrate accounts for 25-40% of the total amount of the resin solution, and the cellulose nitrate is completely and uniformly dissolved for later use.

Dissolution of cellulose acetate: and adding the cellulose acetate butyrate ester of Istmann CAB-381-0.5 into ethyl acetate or n-propyl acetate while stirring, wherein the cellulose acetate accounts for 15-25% of the total amount of the resin solution, and is completely and uniformly dissolved for later use.

Dissolution of maleic acid modified rosin resin: adding maleic acid modified rosin resin with acid value of 20-50(mgKOH/g) into ethyl acetate or n-propyl acetate while stirring, wherein the maleic acid modified rosin resin accounts for 40-50% of the total amount of the resin solution, and is completely and uniformly dissolved for later use.

(2) Preparation of wax slurry

Mixing polyethylene wax, polytetrafluoroethylene wax micropowder and cellulose nitrate solution, stirring uniformly, finally stirring with a high-speed emulsifier for more than 30 minutes, and under the action of high shear force, dispersing the wax powder to the fineness of less than or equal to 20 microns, wherein the test method refers to GBT 13217.3-2008. Wherein the wax powder accounts for 15-30%.

(3) Preparation of color paste

Uniformly stirring and mixing required pigment powder, an auxiliary agent (a dispersing agent) and cellulose nitrate, adding one or more of appropriate amount of oleamide, erucamide, behenamide and stearic amide, and pre-dispersing for more than 30 minutes by using a high-speed dispersion stirrer, wherein an appropriate amount of solvent is used for adjusting viscosity; and after the pre-dispersion is finished, repeatedly grinding by using a sand mill until the fineness is less than or equal to 20 micrometers, and finishing the color paste preparation by using the inspection method according to GBT 13217.3-2008.

(4) Adding a hardening and tempering resin component

On the basis of the prepared color paste, proper amount of maleic acid modified rosin resin solution and liquid epoxy resin are added step by step, and proper amount of solvent is added to adjust color concentration, viscosity and drying speed.

(5) Adding auxiliary agent and film-forming agent to regulate the performance of the involucra

Finally, on the basis of the printing ink, the required wax slurry, the auxiliary agent and the film forming agent are added, so that the adhesion fastness, the friction resistance, the smoothness, the blister resistance, the flexibility, the tension resistance and the like of the printing ink all meet the design indexes.

The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.

Examples 1 to 5:

the alkaline washable aluminum foil printing inks of examples 1 to 5 were prepared by mixing according to the formulation of table 1:

table 1: unit: wt.%

The inks of examples 1 to 5 were printed on an aluminum foil substrate for labels using a laboratory color developing instrument, dried at room temperature, and then subjected to performance evaluation:

table 2:

note:

1. the adhesion fastness is detected by using a 3M600 adhesive tape;

2. the rubbing resistance is qualified after being rubbed back and forth for 500 times by adopting A4 printing paper and a 1KG pressing block without obvious decolorization;

3. the smoothness and the flexibility are judged according to the fact that no abnormity exists in the steps of actual label embossing, label film cutting and automatic labeling;

4. the water soaking resistance is that after the color sample is soaked in cold water for 30 minutes, the color sample is rubbed with cotton cloth by finger pressure for 20 minutes, and no obvious decoloration is qualified;

5. the anti-sticking process comprises the steps of overlapping the front side and the back side of a plurality of spread color samples, pressing the front side and the back side with the pressure of 3KG/CM2, and standing the mixture for 24 hours at the temperature of 60 ℃ to ensure that no obvious sticking is qualified;

6. the alkali solution tested was 2.5% sodium hydroxide solution, the temperature of the alkali solution was 80 ℃;

7. the alkali penetration speed is the time from the beginning of immersing in the alkali liquor to the beginning of bubbling on the ink surface;

8. the label decomposition time is the time from the label being immersed in the alkali liquor until all labels are decomposed (no bubbles are generated);

9. the degree of alkaline washing decomposition is the degree of residual particles visible to naked eyes in the alkaline liquor;

10. the color of the alkali liquor is the color degree of the clear liquid of the alkali liquor visually after the alkali liquor is cooled to the normal temperature.

As can be seen from Table 2, the inks of examples 1 to 5 can meet the alkaline washing requirements of aluminum foil labels, can be completely decomposed in a specified alkaline solution, do not cause color pollution to the alkaline solution, and are suitable for being used in glass bottle recycling occasions.

It should be understood that equivalent substitutions and changes to the technical solution and the inventive concept of the present invention should be made by those skilled in the art to the protection scope of the appended claims.