阅读说明：本技术 一种环保油墨及其加工处理工艺 (Environment-friendly ink and processing treatment process thereof ) 是由 付志泉 于 2021-01-19 设计创作，主要内容包括：本发明公开了一种环保油墨,该环保油墨由以下重量份数的原料制备而成：改性壳聚糖：30-50份；聚乙烯吡咯烷酮：10-20份；纳米级聚吡咯：6-15份；纤维素纳米原纤维：5-10份；乙酸乙烯酯共聚物：5-8份；颜填料5-6份；表面活性剂：3-5份；偶联剂：1-2份；聚乙二醇：1-3份；十二烷基三甲基溴化铵：2-5份；溶剂：10-15份；本发明相比现有技术具有以下优点：本发明得到的环保油墨通过对重量组分进行合理选择,并采用适当的步骤进行调配,使得环保油墨的附着力更好,且制备方法简单,工艺条件低,产品品质稳定。(The invention discloses an environment-friendly ink which is prepared from the following raw materials in parts by weight: modified chitosan: 30-50 parts; polyvinylpyrrolidone: 10-20 parts; nanoscale polypyrrole: 6-15 parts; cellulose nano-fibrils: 5-10 parts; vinyl acetate copolymer: 5-8 parts; 5-6 parts of pigment and filler; surfactant (b): 3-5 parts; coupling agent: 1-2 parts; polyethylene glycol: 1-3 parts; dodecyl trimethyl ammonium bromide: 2-5 parts; solvent: 10-15 parts; compared with the prior art, the invention has the following advantages: the environment-friendly ink obtained by the invention has better adhesive force by reasonably selecting the weight components and adopting proper steps for blending, and the environment-friendly ink has the advantages of simple preparation method, low process conditions and stable product quality.)

1. An environment-friendly ink is characterized in that: the environment-friendly ink is prepared from the following raw materials in parts by weight: modified chitosan: 30-50 parts; polyvinylpyrrolidone: 10-20 parts; nanoscale polypyrrole: 6-15 parts; cellulose nano-fibrils: 5-10 parts; vinyl acetate copolymer: 5-8 parts; 5-6 parts of pigment and filler; surfactant (b): 3-5 parts; coupling agent: 1-2 parts; polyethylene glycol: 1-3 parts; dodecyl trimethyl ammonium bromide: 2-5 parts; solvent: 10-15 parts; the modified chitosan is prepared by the following steps: (a) uniformly mixing acetic acid, lactic acid and distilled water in a weight ratio of 2:1:2 to obtain an acidic mixed solution; (b) adding chitosan into the acidic mixed solution obtained in the step (a), and continuously stirring to obtain an acidic mixture in the adding process; (c) adding citric acid into the acidic mixture obtained in the step (b), uniformly stirring, centrifuging for 1h to obtain the modified chitosan, and storing the modified chitosan in a sealed bottle.

2. An environmentally friendly ink as claimed in claim 1, wherein: the surfactant is tween-80; the solvent comprises deionized water and glycerol, and the weight part ratio of the deionized water to the glycerol is 4: 3.

3. An environmentally friendly ink as claimed in claim 2, wherein: the coupling agent is a silane coupling agent.

4. An environmentally friendly ink as claimed in claim 3, wherein: the pigment filler is an inorganic pigment, an organic pigment and a filler, and the weight part ratio of the inorganic pigment to the organic pigment to the filler is 1:1: 1.

5. An environmentally friendly ink as claimed in claim 4, wherein: the chitosan used in the step (b) is 90% of chitosan, and the weight part ratio of the chitosan to the acidic mixed solution in the step (b) is 2: 1; the weight part of the citric acid in the step (c) is 0.1 time of that of the chitosan.

6. The processing and treatment process of the environment-friendly ink according to any one of claims 1 to 5, wherein the environment-friendly ink is prepared by the following process steps: (1) adding the modified chitosan, polyvinylpyrrolidone, nano-scale polypyrrole, cellulose nano-fibril, vinyl acetate copolymer and coupling agent into a high-speed stirrer and stirring; (2) adding pigment and filler, surfactant, polyethylene glycol, dodecyl trimethyl ammonium bromide and solvent into the step (1), and continuously stirring at 1500r/min for 35-50min to obtain a mixture; (3) grinding the mixture obtained in the step (2) by a three-roller machine until the fineness reaches below 15 mu m, and then stirring at a high speed of 800r/min for 10-15min to obtain the ink product.

7. The processing and treating process of the environment-friendly ink as claimed in claim 6, wherein the processing and treating process comprises the following steps: in the step (1), the stirring speed is 700r/min-900r/min, and the stirring time is 15-30 min.

Technical Field

The invention relates to the technical field of printing ink, in particular to environment-friendly printing ink and a processing technology thereof.

Background

Ink is an important material for printing packaging materials, and represents patterns and characters on a printing material through printing. The ink comprises main components and auxiliary components, which are uniformly mixed and repeatedly rolled to form viscous colloidal fluid, which consists of pigment, binder, auxiliary agent and solvent and is used for various printings such as books, periodicals, packaging decorations, building decorations and the like. As social demands increase, ink varieties and yields also expand and grow accordingly. With the development of printing technology and the emphasis of printing industry on the problems of production efficiency, energy conservation and the like, the domestic printing industry is rapidly developing to the field of high-speed printing at present.

Ink is one of the most critical factors for ensuring print quality. The existing inks for printing always have various problems: some printing ink contains benzene and ketone derivatives, so that the environmental pollution is large; some printing ink has poor adaptability, and the adhesive force of different paper sheets cannot be ensured, or the total adhesive force is not strong enough; some inks have good combination properties, but the components are too toxic and have chronic physical harm to the printer. For the above problems, it is important to continuously develop new raw material formulations and develop an environment-friendly ink.

Disclosure of Invention

In order to overcome part of defects and shortcomings in the prior art, the invention provides the environment-friendly ink and the processing technology thereof, which can improve the adhesive force of the ink and reduce the pollution to the environment.

In order to achieve the purpose, the invention provides the following technical scheme that the environment-friendly ink is prepared from the following raw materials in parts by weight: modified chitosan: 30-50 parts; polyvinylpyrrolidone: 10-20 parts; nanoscale polypyrrole: 6-15 parts; cellulose nano-fibrils: 5-10 parts; vinyl acetate copolymer: 5-8 parts; 5-6 parts of pigment and filler; surfactant (b): 3-5 parts; coupling agent: 1-2 parts; polyethylene glycol: 1-3 parts; dodecyl trimethyl ammonium bromide: 2-5 parts; solvent: 10-15 parts; the modified chitosan is prepared by the following steps: (a) uniformly mixing acetic acid, lactic acid and distilled water in a weight ratio of 2:1:2 to obtain an acidic mixed solution; (b) adding chitosan into the acidic mixed solution obtained in the step (a), and continuously stirring to obtain an acidic mixture in the adding process; (c) adding citric acid into the acidic mixture obtained in the step (b), uniformly stirring, centrifuging for 1h to obtain the modified chitosan, and storing the modified chitosan in a sealed bottle.

The surfactant is tween-80; the solvent comprises deionized water and glycerol, and the weight part ratio of the deionized water to the glycerol is 4: 3.

The coupling agent is a silane coupling agent.

The pigment filler is inorganic pigment, organic pigment and filler, and the weight part ratio of the inorganic pigment to the organic pigment to the filler is 1:1: 1.

The chitosan used in the step (b) is 90% of chitosan, and the weight part ratio of the chitosan to the acidic mixed solution in the step (b) is 2: 1; the weight part of the citric acid in the step (c) is 0.1 time of that of the chitosan.

The processing treatment process of the environment-friendly ink comprises the following steps: (1) adding the modified chitosan, polyvinylpyrrolidone, nano-scale polypyrrole, cellulose nano-fibril, vinyl acetate copolymer and coupling agent into a high-speed stirrer and stirring; (2) adding pigment and filler, surfactant, polyethylene glycol, dodecyl trimethyl ammonium bromide and solvent into the step (1), and continuously stirring at 1500r/min for 35-50min to obtain a mixture; (3) grinding the mixture obtained in the step (2) by a three-roller machine until the fineness reaches below 15 mu m, and then stirring at a high speed of 800r/min for 10-15min to obtain the ink product.

In the step (1), the stirring speed is 700r/min-900r/min, and the stirring time is 15-30 min.

Compared with the prior art, the invention has the following advantages:

1. the chitosan used in the invention is biodegradable, belongs to an environment-friendly material, and has a micro-structure with a wrinkled surface after being treated by acid, so that the adhesion force is increased in the using process of the finished printing ink;

2. the invention selects deionized water and glycerol as solvents, wherein the glycerol is beneficial to the formation of spherical nano-scale polypyrrole particles, can prevent polymer particles from precipitating and can play a certain role of a stabilizer and a certain role of a plasticizer;

3. tween-80 is used as a surfactant, so that the combination of pigment and filler and dodecyl trimethyl ammonium bromide is effectively prevented, the stability of the mixed ink is improved, and the addition of the dodecyl trimethyl ammonium bromide can improve the Zeta potential, so that the adsorption and fixation of the pigment and the ink on a printed matter are facilitated;

4. cellulose nanofibrils are powerful candidates for forming freestanding and biodegradable substrates and ink formulations for printed electronics due to their nanoscale size, high surface area, low density, excellent mechanical properties, sustainable usability, renewability, ability to form freestanding transparent films and stability of suspensions;

5. the environment-friendly ink obtained by the invention has the advantages of better adhesive force, simple preparation method, low process condition and low yield by reasonably selecting the weight components and adopting proper steps for blending

The product quality is stable.

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments of the present invention, and it should be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The modified chitosan used in each of the following examples was obtained by the following steps: (a) uniformly mixing acetic acid, lactic acid and distilled water in a weight ratio of 2:1:2 to obtain an acidic mixed solution; (b) adding chitosan with one time of the weight of the acid mixed solution into the acid mixed solution obtained in the step (a), and continuously stirring at room temperature in the adding process to obtain an acid mixture; (c) adding citric acid with the weight part of 0.1 time of that of the chitosan into the acidic mixture obtained in the step (b), uniformly stirring, centrifuging for 1h to obtain the modified chitosan, and storing the modified chitosan in a sealed bottle.

Example 1:

(1) adding 36 parts of modified chitosan, 20 parts of polyvinylpyrrolidone, 10 parts of nano-scale polypyrrole, 10 parts of cellulose nano fibril, 7 parts of vinyl acetate copolymer and 1 part of coupling agent into a high-speed stirrer, and stirring at a high speed of 900r/min for 10 min;

(2) adding 6 parts of pigment and filler, 5 parts of surfactant, 2 parts of polyethylene glycol, 3 parts of dodecyl trimethyl ammonium bromide and 15 parts of solvent into the step (1), and continuously stirring at 1500r/min for 35min to obtain a mixture; (ii) a

(3) Grinding the mixture obtained in the step (2) by a three-roller machine until the fineness reaches below 15 mu m, and then stirring at a high speed of 800r/min for 15min to obtain the ink product.

Example 2:

(1) adding 40 parts of modified chitosan, 15 parts of polyvinylpyrrolidone, 15 parts of nano-scale polypyrrole, 8 parts of cellulose nano fibril, 8 parts of vinyl acetate copolymer and 2 parts of coupling agent into a high-speed stirrer, and stirring at a high speed of 900r/min for 10 min;

(2) adding 5 parts of pigment and filler, 4 parts of surfactant, 3 parts of polyethylene glycol, 2 parts of dodecyl trimethyl ammonium bromide and 13 parts of solvent into the step (1), and continuously stirring at 1500r/min for 35min to obtain a mixture; (ii) a

(3) Grinding the mixture obtained in the step (2) by a three-roller machine until the fineness reaches below 15 mu m, and then stirring at a high speed of 800r/min for 15min to obtain the ink product.

Example 3:

(1) adding 50 parts of modified chitosan, 16 parts of polyvinylpyrrolidone, 6 parts of nano-scale polypyrrole, 9 parts of cellulose nano fibril, 8 parts of vinyl acetate copolymer and 1 part of coupling agent into a high-speed stirrer, and stirring at a high speed of 900r/min for 10 min;

(2) adding 5 parts of pigment and filler, 4 parts of surfactant, 1 part of polyethylene glycol, 5 parts of dodecyl trimethyl ammonium bromide and 10 parts of solvent into the step (1), and continuously stirring at 1500r/min for 35min to obtain a mixture; (ii) a

(3) Grinding the mixture obtained in the step (2) by a three-roller machine until the fineness reaches below 15 mu m, and then stirring at a high speed of 800r/min for 15min to obtain the ink product.

Example 4:

(1) adding 45 parts of modified chitosan, 14 parts of polyvinylpyrrolidone, 12 parts of nano-scale polypyrrole, 7 parts of cellulose nano fibril, 6 parts of vinyl acetate copolymer and 2 parts of coupling agent into a high-speed stirrer, and stirring at a high speed of 900r/min for 10 min;

(2) adding 6 parts of pigment and filler, 3 parts of surfactant, 2 parts of polyethylene glycol, 3 parts of dodecyl trimethyl ammonium bromide and 15 parts of solvent into the step (1), and continuously stirring at 1500r/min for 35min to obtain a mixture; (ii) a

(3) Grinding the mixture obtained in the step (2) by a three-roller machine until the fineness reaches below 15 mu m, and then stirring at a high speed of 800r/min for 15min to obtain the ink product.

Example 5:

(1) adding 45 parts of modified chitosan, 14 parts of polyvinylpyrrolidone, 12 parts of nano-scale polypyrrole, 7 parts of cellulose nano fibril, 6 parts of vinyl acetate copolymer and 2 parts of coupling agent into a high-speed stirrer, and stirring at a high speed of 700r/min for 15 min;

(2) adding 6 parts of pigment and filler, 3 parts of surfactant, 2 parts of polyethylene glycol, 3 parts of dodecyl trimethyl ammonium bromide and 15 parts of solvent into the step (1), and continuously stirring at 1500r/min for 40min to obtain a mixture; (ii) a

(3) Grinding the mixture obtained in the step (2) by a three-roller machine until the fineness reaches below 15 mu m, and then stirring at a high speed of 800r/min for 10min to obtain the ink product.

Example 6:

(1) adding 45 parts of modified chitosan, 14 parts of polyvinylpyrrolidone, 12 parts of nano-scale polypyrrole, 7 parts of cellulose nano fibril, 6 parts of vinyl acetate copolymer and 2 parts of coupling agent into a high-speed stirrer, and stirring at a high speed of 700r/min for 10 min;

(2) adding 6 parts of pigment and filler, 3 parts of surfactant, 2 parts of polyethylene glycol, 3 parts of dodecyl trimethyl ammonium bromide and 15 parts of solvent into the step (1), and continuously stirring at 1500r/min for 35min to obtain a mixture; (ii) a

(3) Grinding the mixture obtained in the step (2) by a three-roller machine until the fineness reaches below 15 mu m, and then stirring at a high speed of 800r/min for 10min to obtain the ink product.

Comparative example 1:

(1) adding 45 parts of unmodified chitosan, 14 parts of polyvinylpyrrolidone, 12 parts of nano-scale polypyrrole, 7 parts of cellulose nano fibril, 6 parts of vinyl acetate copolymer and 2 parts of coupling agent into a high-speed stirrer, and stirring at a high speed of 700r/min for 10 min;

(2) adding 6 parts of pigment and filler, 3 parts of surfactant, 2 parts of polyethylene glycol, 3 parts of dodecyl trimethyl ammonium bromide and 15 parts of solvent into the step (1), and continuously stirring at 1500r/min for 35min to obtain a mixture; (ii) a

(3) Grinding the mixture obtained in the step (2) by a three-roller machine until the fineness reaches below 15 mu m, and then stirring at a high speed of 800r/min for 10min to obtain the ink product.

Comparative example 2:

(1) adding 45 parts of modified chitosan, 14 parts of polyvinylpyrrolidone, 12 parts of nano-scale polypyrrole, 7 parts of cellulose nano fibril, 6 parts of vinyl acetate copolymer and 2 parts of coupling agent into a high-speed stirrer, and stirring at a high speed of 700r/min for 10 min;

(2) adding 6 parts of pigment and filler, 3 parts of surfactant, 2 parts of polyethylene glycol, 3 parts of dodecyl trimethyl ammonium bromide and 15 parts of deionized water into the step (1), and continuously stirring at 1500r/min for 35min to obtain a mixture; (ii) a

(3) Grinding the mixture obtained in the step (2) by a three-roller machine until the fineness reaches below 15 mu m, and then stirring at a high speed of 800r/min for 10min to obtain the ink product.

The ink products obtained in examples 1 to 6 and comparative examples 1 to 2 were subjected to the performance test, and the adhesion test method was as follows: and (3) pulling the ink layer on the substrate by using a 3M adhesive tape, and determining the ink adhesion according to the residual amount of the ink layer on the substrate, wherein the substrate is a Polyethylene terephthalate (PET) substrate. Peel strength test method, the amount of force required to transfer the ink portion to the PE substrate was also determined by attaching the ink to the pet substrate and performing a peel test using a Polyethylene (PE) substrate.

The test results are shown in table 1 below;

table 1:

the test results show that the optimal ratio of the component combination and the optimal preparation process conditions can be obtained through comparison of the examples 1 to 6, and the test results show that the example 6 is the optimal example, and the ink obtained in the example 6 has excellent performances in both adhesion and solvent residue; the comparison of the test results of example 6 and comparative example 1 shows that the ink product obtained by using the modified chitosan has better adhesive force and peel strength compared with the common chitosan; the chitosan used in the invention is biodegradable, belongs to an environment-friendly material, and has a micro-structure with a wrinkled surface after being treated by acid, so that the adhesion force is increased in the using process of the finished printing ink; the results of example 6 and comparative example 2 show that glycerol also has a certain effect on the product performance in the environmentally friendly ink composition, and deionized water and glycerol are selected as solvents in the present invention, wherein glycerol helps the formation of spherical nanoscale polypyrrole particles, prevents the polymer particles from precipitating, and can play a certain role of a stabilizer and a plasticizer; tween-80 is used as a surfactant, so that the combination of pigment and filler and dodecyl trimethyl ammonium bromide is effectively prevented, the stability of the mixed ink is improved, and the addition of the dodecyl trimethyl ammonium bromide can improve the Zeta potential, so that the adsorption and fixation of the pigment and the ink on a printed matter are facilitated; cellulose nano-fibrils are powerful candidates for forming independent and biodegradable substrates and printed electronics ink formulations; the environment-friendly ink obtained by the invention has better adhesive force by reasonably selecting the weight components and adopting proper steps for blending, and the preparation method is simple, the process condition is low, and the product quality is stable; the analysis proves that the environment-friendly ink provided by the invention has small solvent residue and has the effects of environmental protection and no pollution.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.