阅读说明：本技术 适用于挤出复合工艺的醇溶柔版里印油墨及其制备方法 (Alcohol-soluble flexographic inner printing ink suitable for extrusion compounding process and preparation method thereof ) 是由 王鑫 汪慧 程刚 潘吉红 于 2020-12-28 设计创作，主要内容包括：本发明提供了一种适用于挤出复合工艺的醇溶柔版里印油墨及其制备方法,油墨包括以下组成成分：醇溶硝酸纤维素树脂：25％-30％、醇溶聚氨酯树脂：10％-15％、颜料：14％-40％、聚乙烯蜡：0.3％-0.5％、气相二氧化硅：0.4％-1％、丙二醇醚类：4％-15％、正丙醇：3％-15％、乙醇：3％-15％、改性达玛树脂：4％-8％和偶联剂：2.5％-4％。本发明选用醇溶型硝酸纤维素和醇溶型聚氨酯树脂、有机颜料或无机颜料、醇醚类溶剂、醇溶型改性达玛树脂、偶联剂等研磨而成,通过调整配方,选择最优的树脂类型和树脂配比,在挤出复合阶段,挤出复合强度提高到1.5N/15mm以上,满足了现有的市场需求。(The invention provides alcohol-soluble flexographic inner printing ink suitable for an extrusion compounding process and a preparation method thereof, wherein the ink comprises the following components: alcohol-soluble cellulose nitrate resin: 25% -30% of alcohol-soluble polyurethane resin: 10% -15%, pigment: 14% -40%, polyethylene wax: 0.3% -0.5%, fumed silica: 0.4% -1%, propylene glycol ethers: 4% -15%, n-propanol: 3% -15%, ethanol: 3% -15%, modified dammar resin: 4% -8% and coupling agent: 2.5 to 4 percent. The alcohol-soluble polyurethane resin is prepared by grinding alcohol-soluble cellulose nitrate, alcohol-soluble polyurethane resin, organic pigment or inorganic pigment, alcohol ether solvent, alcohol-soluble modified dammar resin, coupling agent and the like, the optimal resin type and resin proportion are selected by adjusting the formula, and the extrusion composite strength is improved to more than 1.5N/15mm in the extrusion composite stage, so that the existing market demands are met.)

1. An alcohol-soluble flexographic inner printing ink suitable for an extrusion compounding process is characterized in that: comprises the following components:

alcohol-soluble cellulose nitrate resin: 25 to 30 percent

Alcohol-soluble polyurethane resin: 10 to 15 percent of

Pigment: 14 to 40 percent of

Polyethylene wax: 0.3 to 0.5 percent

Fumed silica: 0.4 to 1 percent

Propylene glycol ethers: 4 to 15 percent

N-propanol: 3 to 15 percent of

Ethanol: 3 to 15 percent of

Modified dammar resin: 4 to 8 percent of

Coupling agent: 2.5 to 4 percent.

2. The alcohol soluble flexographic printing ink suitable for use in extrusion compounding processes of claim 1, wherein: the alcohol soluble cellulose nitrate resin is set to be 20-50% alcohol soluble cellulose nitrate resin solution.

3. The alcohol soluble flexographic printing ink suitable for use in extrusion compounding processes of claim 1, wherein: the polyurethane solution is set to be 30-50% alcohol-soluble polyurethane resin solution.

4. The alcohol soluble flexographic printing ink suitable for use in extrusion compounding processes of claim 1, wherein: the modified dammar resin is set to 40-60% modified dammar resin solution.

5. The alcohol soluble flexographic printing ink suitable for use in extrusion compounding processes of claim 1, wherein: the pigment is one of titanium dioxide, organic yellow pigment, organic red pigment and organic blue pigment.

6. A preparation method of alcohol-soluble flexographic inner printing ink suitable for an extrusion compounding process is characterized by comprising the following steps: the preparation method comprises the following specific steps:

s1, preparing a mixed solvent: accurately measuring propylene glycol ethers, n-propanol and ethanol, adding the propylene glycol ethers, the n-propanol and the ethanol into a stirring cylinder, stirring for 20-45min by using a high-speed dispersion machine at a stirring speed of 1500-2000r/min to fully mix, and taking out part of a mixed solvent;

s2, preparing resin liquid: adding alcohol-soluble cellulose nitrate resin, alcohol-soluble polyurethane resin, pigment, polyethylene wax, fumed silica, modified dammar resin and coupling agent into the stirring cylinder body, and continuing stirring and dispersing for 20-30min by using a high-speed dispersion machine at the stirring speed of 1500-2000r/min to uniformly mix the materials to form dispersed color paste;

s3, grinding and dispersing: pumping the dispersed color paste into a sand mill for sand milling, repeatedly grinding until the fineness of the material is below 20 mu m, flushing the mill by using the taken mixed solvent, and merging the flushing liquid into the grinding material;

s4, filtering and deslagging: pumping the grinding material into a sieving machine, filtering the grinding material, and removing mixed particles and microparticles with overlarge particle sizes in the grinding material to obtain uniformly dispersed grinding material;

s5, ultrasonic dispersion: pumping the sieved grinding material into an ultrasonic oscillator, and carrying out ultrasonic oscillation for 30-60min to obtain the alcohol-soluble flexographic inner printing ink.

Technical Field

The invention relates to the technical field of flexographic extrusion composite printing ink, in particular to alcohol-soluble flexographic inner printing ink suitable for an extrusion composite process and a preparation method thereof.

Background

The printer is one of computer output devices, is used for printing a computer processing result on a related medium, needs to consume printing ink in the use process, and is attracted by manufacturers seeking high-quality pigment products at home and abroad, particularly famous ink and coating enterprises due to the advantages of low dust and environmental protection of pre-dispersed products and high dispersibility, high transparency and high gloss in subsequent application.

The requirements of the current market on environmental protection and safety of the printing gloss oil product are further improved, and the packaged product also puts further requirements on the odor of the printing gloss oil. The market demand for surface printing gloss oil products with extremely low odor is also expanded year by year, and the surface printing gloss oil products with extremely low odor are required to have the characteristics of extremely low odor, good gloss, good leveling property and good wear resistance. The grinding and dispersing process of the surface printing gloss oil is an important step in the production of the surface printing gloss oil, and the quality of the surface printing gloss oil is directly influenced.

At present, the flexographic inner printing composite ink used in the market is mainly inner printing composite ink taking PVB resin as main body resin and inner printing composite ink taking alcohol-soluble polyurethane resin as main body resin. The former is difficult to be applied to high-speed printing because of high viscosity of flexible printing ink made of PVB resin. The flexographic inner printing ink made of alcohol-soluble polyurethane resin has high viscosity, so that printing faults such as poor ink transfer, reverse adhesion of printed matters and the like are easily caused in printing, and other resins with high hardness are needed to be combined for use so as to improve the printing adaptability of the flexographic inner printing ink, but the composite strength of the working procedures after printing is low, particularly the extrusion composite strength can only reach 0.1-0.2N/15mm, and the market demand is difficult to meet.

Disclosure of Invention

The invention provides alcohol-soluble flexographic inner printing ink suitable for an extrusion compounding process and a preparation method thereof, aiming at the problems that the flexographic inner printing ink in the existing market is low in extrusion compounding strength and difficult to meet the requirements of extrusion compounding, the extrusion compounding strength is improved by methods of formula adjustment, addition of novel auxiliary resin and the like, and various market requirements are met.

In order to achieve the technical purpose, the technical scheme of the invention is realized as follows:

an alcohol-soluble flexographic inner printing ink suitable for an extrusion compounding process comprises the following components:

alcohol-soluble cellulose nitrate resin: 25 to 30 percent

Alcohol-soluble polyurethane resin: 10 to 15 percent of

Pigment: 14 to 40 percent of

Polyethylene wax: 0.3 to 0.5 percent

Fumed silica: 0.4 to 1 percent

Propylene glycol ethers: 4 to 15 percent

N-propanol: 3 to 15 percent of

Ethanol: 3 to 15 percent of

Modified dammar resin: 4 to 8 percent of

Coupling agent: 2.5 to 4 percent.

The alcohol-soluble cellulose nitrate resin is one of main body resins of the flexographic extrusion composite ink, has good dispersion performance, can well wrap pigment molecules through grinding, and has excellent stability. Available commercially.

The alcohol soluble polyurethane resin is another main resin of the flexographic extrusion composite ink, improves the toughness of ink film forming, and provides adhesion on plastic substrates (BOPP, PET and the like). Available commercially.

The pigment is a colorant, which imparts various colors to the ink, and may be an organic pigment or an inorganic pigment, and is commercially available.

The polyethylene wax improves the printing adaptability of the ink and can be purchased in the market.

Fumed silica, which improves the printability and anti-blocking properties of the ink, is commercially available.

Solvents for dissolving resins, wetting pigments, improving solvent evaporation rate and adjusting viscosity, etc., and conventional propylene glycol ethers, n-propanol and ethanol are commercially available.

The modified dammar resin is used as auxiliary resin for flexographic extrusion composite ink, on one hand, the adhesive force on a plastic substrate can be enhanced, and simultaneously, the extrusion composite strength can be improved.

The coupling agent plays a role in bridging and crosslinking in an ink system, can rapidly generate bridging reaction at the temperature of over 60 ℃, improves the adhesive force of resin and a plastic substrate, ensures that the ink is more stable in film forming after crosslinking, and also improves the extrusion compounding strength in the subsequent extrusion compounding process.

Preferably, the alcohol soluble cellulose nitrate resin is provided as a 20-50% alcohol soluble cellulose nitrate resin solution.

Preferably, the polyurethane solution is provided as a 30-50% alcohol-soluble polyurethane resin solution.

Preferably, the modified dammar resin is set to a 40-60% modified dammar resin solution.

Preferably, the pigment is one of titanium dioxide, organic yellow pigment, organic red pigment and organic blue pigment.

A preparation method of alcohol-soluble flexographic inner printing ink suitable for an extrusion compounding process comprises the following specific steps:

s1, preparing a mixed solvent: accurately measuring propylene glycol ethers, n-propanol and ethanol, adding the propylene glycol ethers, the n-propanol and the ethanol into a stirring cylinder, stirring for 20-45min by using a high-speed dispersion machine at a stirring speed of 1500-2000r/min to fully mix, and taking out part of a mixed solvent;

s2, preparing resin liquid: adding alcohol-soluble cellulose nitrate resin, alcohol-soluble polyurethane resin, pigment, polyethylene wax, fumed silica, modified dammar resin and coupling agent into the stirring cylinder body, and continuing stirring and dispersing for 20-30min by using a high-speed dispersion machine at the stirring speed of 1500-2000r/min to uniformly mix the materials to form dispersed color paste;

s3, grinding and dispersing: pumping the dispersed color paste into a sand mill for sand milling, repeatedly grinding until the fineness of the material is below 20 mu m, flushing the mill by using the taken mixed solvent, and merging the flushing liquid into the grinding material;

s4, filtering and deslagging: pumping the grinding material into a sieving machine, filtering the grinding material, and removing mixed particles and microparticles with overlarge particle sizes in the grinding material to obtain uniformly dispersed grinding material;

s5, ultrasonic dispersion: pumping the sieved grinding material into an ultrasonic oscillator, and carrying out ultrasonic oscillation for 30-60min to obtain the alcohol-soluble flexographic inner printing ink.

The invention has the beneficial effects that: the alcohol-soluble flexographic inner printing ink suitable for the extrusion compounding process is prepared by grinding alcohol-soluble cellulose nitrate, alcohol-soluble polyurethane resin, organic pigment or inorganic pigment, alcohol ether solvent, alcohol-soluble modified dammar resin, coupling agent and the like, improves the solubility of the resin and the solubility and uniformity of the inner printing ink by introducing novel resin to improve the components of the inner printing ink, selects the optimal resin type and resin proportion by adjusting the formula, improves the extrusion compounding strength from the original 0.1-0.2N/15mm to more than 1.5N/15mm in the extrusion compounding stage, meets the existing market demands, develops the flexographic printing ink for extrusion compounding along with the market diversification demands, can meet the better customer demands, also improves the competitiveness of a company in the industry, and has good practicability and creativity, has market prospect and application value.

Detailed Description

The technical solutions in the embodiments of the present invention are clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all 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.

Example 1

An alcohol-soluble flexographic inner printing ink suitable for an extrusion compounding process comprises the following components:

21% alcohol soluble nitrocellulose resin: 27.1 percent

40% alcohol-soluble polyurethane resin: 13 percent of

Titanium dioxide: 40 percent of

Polyethylene wax: 0.5 percent

Fumed silica: 0.4 percent

Propylene glycol ethers: 4 percent of

N-propanol: 3 percent of

Ethanol: 3 percent of

50% modified dammar resin: 6 percent of

Coupling agent: 3 percent.

A preparation method of alcohol-soluble flexographic inner printing ink suitable for an extrusion compounding process comprises the following specific steps:

s1, preparing a mixed solvent: accurately measuring propylene glycol ethers, n-propanol and ethanol, adding the propylene glycol ethers, n-propanol and ethanol into a stirring tank, stirring for 20min at a stirring speed of 2000r/min by using a high-speed dispersion machine to fully mix, and taking out part of a mixed solvent;

s2, preparing resin liquid: adding alcohol-soluble cellulose nitrate resin, alcohol-soluble polyurethane resin, pigment, polyethylene wax, fumed silica, modified dammar resin and a coupling agent into a stirring cylinder body, and continuously stirring and dispersing for 20min at the stirring speed of 2000r/min by using a high-speed dispersion machine to uniformly mix the materials to form dispersed color paste;

s3, grinding and dispersing: pumping the dispersed color paste into a sand mill for sand milling, repeatedly grinding until the fineness of the material is below 20 mu m, flushing the mill by using the taken mixed solvent, and merging the flushing liquid into the grinding material;

s4, filtering and deslagging: pumping the grinding material into a sieving machine, filtering the grinding material, and removing mixed particles and microparticles with overlarge particle sizes in the grinding material to obtain uniformly dispersed grinding material;

s5, ultrasonic dispersion: pumping the sieved grinding material into an ultrasonic oscillator, and carrying out ultrasonic oscillation for 30min to obtain the alcohol-soluble flexographic inner printing ink.

Example 2

An alcohol-soluble flexographic inner printing ink suitable for an extrusion compounding process comprises the following components:

21% alcohol soluble nitrocellulose resin: 25.1 percent

40% alcohol-soluble polyurethane resin: 13 percent of

Organic yellow pigment: 15 percent of

Polyethylene wax: 0.5 percent

Fumed silica: 0.4 percent

Propylene glycol ethers: 13 percent of

N-propanol: 12 percent of

Ethanol: 12 percent of

50% modified dammar resin: 6 percent of

Coupling agent: 3 percent.

2. The alcohol soluble flexographic printing ink suitable for use in extrusion compounding processes of claim 1, wherein: the alcohol soluble cellulose nitrate resin is set to be 20-50% alcohol soluble cellulose nitrate resin solution.

A preparation method of alcohol-soluble flexographic inner printing ink suitable for an extrusion compounding process comprises the following specific steps:

s1, preparing a mixed solvent: accurately measuring propylene glycol ethers, n-propanol and ethanol, adding the propylene glycol ethers, the n-propanol and the ethanol into a stirring tank, stirring for 45min at a stirring speed of 1500r/min by using a high-speed dispersion machine to fully mix, and taking out part of a mixed solvent;

s2, preparing resin liquid: adding alcohol-soluble cellulose nitrate resin, alcohol-soluble polyurethane resin, pigment, polyethylene wax, fumed silica, modified dammar resin and a coupling agent into a stirring cylinder body, and continuously stirring and dispersing for 30min at the stirring speed of 1500r/min by using a high-speed dispersion machine to uniformly mix the materials to form dispersed color paste;

s3, grinding and dispersing: pumping the dispersed color paste into a sand mill for sand milling, repeatedly grinding until the fineness of the material is below 20 mu m, flushing the mill by using the taken mixed solvent, and merging the flushing liquid into the grinding material;

s4, filtering and deslagging: pumping the grinding material into a sieving machine, filtering the grinding material, and removing mixed particles and microparticles with overlarge particle sizes in the grinding material to obtain uniformly dispersed grinding material;

s5, ultrasonic dispersion: and pumping the sieved grinding material into an ultrasonic oscillator, and carrying out ultrasonic oscillation for 60min to obtain the alcohol-soluble flexographic inner printing ink.

Example 3

An alcohol-soluble flexographic inner printing ink suitable for an extrusion compounding process is characterized in that: comprises the following components:

21% alcohol soluble nitrocellulose resin: 25.1 percent

40% alcohol-soluble polyurethane resin: 13 percent of

Organic red pigment: 15 percent of

Polyethylene wax: 0.5 percent

Fumed silica: 0.4 percent

Propylene glycol ethers: 15 percent of

N-propanol: 12 percent of

Ethanol: 10 percent of

50% modified dammar resin: 6 percent of

Coupling agent: 3 percent.

A preparation method of alcohol-soluble flexographic inner printing ink suitable for an extrusion compounding process comprises the following specific steps:

s1, preparing a mixed solvent: accurately measuring propylene glycol ethers, n-propanol and ethanol, adding the propylene glycol ethers, the n-propanol and the ethanol into a stirring tank, stirring for 35min at a stirring speed of 1800r/min by using a high-speed dispersion machine to fully mix, and taking out part of a mixed solvent;

s2, preparing resin liquid: adding alcohol-soluble cellulose nitrate resin, alcohol-soluble polyurethane resin, pigment, polyethylene wax, fumed silica, modified dammar resin and a coupling agent into a stirring cylinder body, and continuously stirring and dispersing for 25min at the stirring speed of 1800r/min by using a high-speed dispersion machine to uniformly mix the materials to form dispersed color paste;

s3, grinding and dispersing: pumping the dispersed color paste into a sand mill for sand milling, repeatedly grinding until the fineness of the material is below 20 mu m, flushing the mill by using the taken mixed solvent, and merging the flushing liquid into the grinding material;

s4, filtering and deslagging: pumping the grinding material into a sieving machine, filtering the grinding material, and removing mixed particles and microparticles with overlarge particle sizes in the grinding material to obtain uniformly dispersed grinding material;

s5, ultrasonic dispersion: and pumping the sieved grinding material into an ultrasonic oscillator, and performing ultrasonic oscillation for 45min to obtain the alcohol-soluble flexographic inner printing ink.

In the invention, the alcohol-soluble flexographic inner printing ink suitable for the extrusion compounding process is prepared by grinding alcohol-soluble nitrocellulose, alcohol-soluble polyurethane resin, organic pigment or inorganic pigment, alcohol ether solvent, alcohol-soluble modified dammar resin, coupling agent and the like, the solubility of the resin is improved by introducing novel resin to improve the components of the inner printing ink, the solubility and the uniformity of the inner printing ink are improved, the optimal resin type and resin proportion are selected by adjusting the formula, the extrusion compounding strength is improved to more than 1.5N/15mm from the original 0.1-0.2N/15mm in the extrusion compounding stage, the existing market requirements are met, along with the diversified requirements of the market, the flexographic printing ink for extrusion compounding is developed, the requirements of better customers can be met, the competitiveness of a company in the industry is also improved, and the alcohol-soluble flexographic inner printing ink has good practicability and creativity, has market prospect and application value.

The ink produced in each example was used as a performance guide, and the results of the tests and applications are shown in the following table:

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.