阅读说明：本技术 一种单一溶剂的高速印刷塑料复合白色油墨及其制备方法 (Single-solvent high-speed printing plastic composite white ink and preparation method thereof ) 是由 潘小军 罗良萍 汪健 潘吉红 于 2020-12-28 设计创作，主要内容包括：本发明提供了一种单一溶剂的高速印刷塑料复合白色油墨及其制备方法,包括以下组成成分：改性聚氨酯树脂25-35％、三元氯醋树脂10-12％、颜料10-35％、酯类溶剂10-30％、聚乙烯蜡0-1％、消光粉0-1％、分散剂0.2-0.5％、附着力促进剂0.5-2％、其他助剂0.2-1.5％。本发明以单一的酯类溶剂为油墨溶剂,溶解力和挥发速度适中,符合树脂合成和印刷设备要求。油墨中的溶剂为单一酯类,方便回收系统回收和精馏,精馏纯度可达99％以上,回收溶剂可在印刷和复合工序中正常使用,VOC排放可以下降到回收之前的5％以下。同时,通过对油墨配方和原材料的优化,可用于印刷速度400m/min以上的印刷。(The invention provides a single-solvent high-speed printing plastic composite white ink and a preparation method thereof, wherein the single-solvent high-speed printing plastic composite white ink comprises the following components: 25-35% of modified polyurethane resin, 10-12% of ternary vinyl chloride-vinyl acetate copolymer, 10-35% of pigment, 10-30% of ester solvent, 0-1% of polyethylene wax, 0-1% of matting powder, 0.2-0.5% of dispersing agent, 0.5-2% of adhesion promoter and 0.2-1.5% of other auxiliary agents. The invention takes single ester solvent as the printing ink solvent, has moderate dissolving power and volatilization speed, and meets the requirements of resin synthesis and printing equipment. The solvent in the printing ink is single ester, so that the recovery and rectification of a recovery system are convenient, the rectification purity can reach more than 99 percent, the recovered solvent can be normally used in printing and composite working procedures, and the VOC emission can be reduced to less than 5 percent before recovery. Meanwhile, the ink formula and the raw materials are optimized, so that the ink can be used for printing at the printing speed of more than 400 m/min.)

1. A single-solvent high-speed printing plastic composite white ink is characterized in that: comprises the following components:

modified polyurethane resin: 25 to 35 percent

Ternary vinyl chloride-vinyl acetate copolymer: 10 to 12 percent of

Pigment: 10 to 35 percent

Ester solvent: 10 to 30 percent

Polyethylene wax: 0 to 1 percent

Matting powder: 0 to 1 percent

Dispersing agent: 0.2 to 0.5 percent

An adhesion promoter: 0.5 to 2 percent

Other auxiliary agents: 0.2 to 1.5 percent.

2. The single solvent, high speed printing plastic composite white ink as claimed in claim 1, wherein: the pigment is titanium dioxide.

3. The single solvent, high speed printing plastic composite white ink as claimed in claim 1, wherein: the other auxiliary agents are one or more of antistatic agents, modified silicon type defoaming agents, film forming auxiliary agents and ultraviolet absorbers.

4. The single solvent, high speed printing plastic composite white ink as claimed in claim 1, wherein: the ester solvent is one or more of ethyl acetate, butyl acetate, isopropyl acetate, ethyl propionate, ethyl butyrate and ethyl lactate.

5. A preparation method of single-solvent high-speed printing plastic composite white ink is characterized by comprising the following steps: the preparation method comprises the following specific steps:

(1) dry mixing: accurately weighing the pigment, the matting powder, the polyethylene wax and other additives according to the formula in required parts by weight, stirring and mixing the materials uniformly at a stirring speed of 1000-;

(2) and dispersing: adding 5-10% of modified polyurethane resin and 10-15% of ternary vinyl chloride-vinyl acetate copolymer resin into a premixing dispersion cylinder, starting a dispersion machine, adding a dispersing agent and 20-30% of single ester solvent at the rotation speed of 300-1500 r/min, fully and uniformly stirring, adding all the mixed materials in the step (1), adding an adhesion promoter, standing for 5-10min, adjusting the rotation speed of the dispersion machine to 1200-1500r/min, and fully stirring to form pre-dispersion color slurry;

(3) and grinding: transferring the pre-dispersed slurry to a sand mill for dispersion, controlling the rotating speed at 1200r/min and the material temperature at 10-50 ℃, controlling the grinding feeding speed at 0.1-0.2MPa, repeatedly grinding for 2-3 times to reach the fineness required by the universal composite ink, and filtering the slurry by using a 200-500-mesh sieve to obtain the pigment color paste;

(4) adjusting viscosity: adding the residual solvent, the ternary vinyl chloride-vinyl acetate copolymer resin and the modified polyurethane resin into the pigment color paste, starting a dispersion machine to stir and disperse, controlling the rotating speed to be 300-1200r/min, dispersing for 10-15min, and adjusting the viscosity of the ink to prepare the finished product of the composite ink;

(5) and packaging: and filtering the obtained composite ink at low temperature for 5-10min by using a 200-plus-500-mesh sieve, carrying out low-temperature vacuum packaging, and then packaging and warehousing.

6. The method for preparing the single-solvent high-speed printing plastic composite white ink according to claim 5, wherein the method comprises the following steps: in the preparation method, the temperature in the step 5 of low-temperature filtration is 5-15 ℃, and the temperature in the low-temperature vacuum packaging is 5-10 ℃.

Technical Field

The invention relates to the technical field of composite white ink, in particular to single-solvent high-speed printing plastic composite white ink and a preparation method thereof.

Background

The gravure printing is one of four printing modes, and the advantages of thick ink layer, bright color, high saturation, high printing plate printing resistance, stable quality of printed products, high printing speed and the like of the printed products occupy an extremely important position in the fields of printing packaging and graphic publishing. The current gravure printing ink is mainly solvent-based ink, and a volatile drying method is mostly adopted, so that the problem of VOCS emission exists.

With the stricter global environmental protection requirements, new environmental protection laws come out, and mandatory local limit standards for VOCs emission are successively released from place to place. Each printing enterprise must take action to cope with. At present, all flexible package printing manufacturers mainly adopt methods of using water-based ink, additionally installing a Regenerative Thermal Oxidizer (RTO), adding a solvent recovery system and the like to solve the problems.

The solvent recovery system can recover the solvent in the printing production process, greatly improves the utilization rate of the solvent, and can reduce the application cost of the solvent in a printing factory, so that the solvent recovery system is popular in a large number of printing factories. However, the recycling of the recovered solvent is difficult, and in one aspect, the recovered solvent may cause off-flavor of the printed matter during application or may have a reduced composite strength during compounding due to purity problems. This requires an increase in the purity of the recovered solvent. Secondly, due to the limitation of the self-performance of the common single solvent ink, the single solvent ink cannot be suitable for the high-speed printing equipment with the printing speed of 400m/min, so that the waste of the equipment performance is caused

The conventional alcohol ester-soluble ink contains a mixed solvent such as isopropyl alcohol, n-butyl ester, propylene glycol methyl ether and the like, and cannot be rectified and separated during solvent recovery, so that the above problem occurs during recycling of the recovered solvent. The common single solvent ink has printing adaptability inferior to that of common alcohol ester ink due to the problems of raw material performance and formula, and cannot meet the requirement of high-speed printing.

Disclosure of Invention

The invention provides single-solvent high-speed printing plastic composite white ink and a preparation method thereof, and the single-solvent ink can be suitable for being used on printing equipment with the printing speed of more than 400m/min, so that the normal replacement of mixed solvent type high-speed ink is completed.

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

a single-solvent high-speed printing plastic composite white ink comprises the following components:

modified polyurethane resin: 25 to 35 percent

Ternary vinyl chloride-vinyl acetate copolymer: 10 to 12 percent of

Titanium dioxide: 10 to 35 percent

Ester solvent: 10 to 30 percent

Polyethylene wax: 0 to 1 percent

Matting powder: 0 to 1 percent

Dispersing agent: 0.2 to 0.5 percent

An adhesion promoter: 0.5 to 2 percent

Other auxiliary agents: 0.2 to 1.5 percent.

The modified polyurethane resin is a main body connecting material of single-solvent composite white ink, all solvents in the resin are ester solvents, the modified polyurethane resin has good ester solubility, can well wrap pigment particles, can provide excellent adhesive force for ink on the surface of plastic, has an excellent film forming effect, and has water boiling resistance. Modified polyurethane resins are commercially available.

The ternary vinyl chloride-vinyl acetate copolymer resin is auxiliary resin, has excellent dispersibility on pigments, helps to form a film and improves the composite strength of printed matters. The ternary vinyl chloride-vinyl acetate copolymer is commercially available.

Titanium dioxide is a colorant, and the main function of the titanium dioxide is to mix the color of the ink when the single-solvent white ink is manufactured. Titanium dioxide is commercially available.

The polyethylene wax has the function of improving the smoothness of a single solvent ink printed matter, better protecting a printing plate and a scraper during printing, and can be purchased in the market.

The ester solvent is a solvent of the single solvent ink, and is used for dissolving the resin and the pigment, and adjusting the viscosity and the volatilization speed of the ink. Ester solvents are commercially available.

The matting powder has the functions of improving the anti-adhesion performance of the ink, improving the fluidity of the ink, improving the solvent residue and the like. Are commercially available.

The dispersing agent has the functions of improving the dispersing effect of the titanium dioxide and improving the stability of the ink. Are commercially available.

The adhesion promoter acts to improve the adhesion of the ink to the OPP substrate. Are commercially available.

Other additives include auxiliary additives such as antistatic agents, antifoaming agents, and film-forming additives, and are added for various purposes, for example, to improve static and bubble problems during printing and to improve the film-forming effect of the ink layer. Are commercially available.

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

Preferably, the other auxiliary agent is one or more of an antistatic agent, a modified silicon type defoaming agent, a film forming auxiliary agent and an ultraviolet absorber.

Preferably, the ester solvent is one or more selected from ethyl acetate, butyl acetate, isopropyl acetate, ethyl propionate, ethyl butyrate, and ethyl lactate.

A preparation method of high-speed printing plastic composite white ink suitable for a single solvent comprises the following specific steps:

(1) dry mixing: accurately weighing the pigment, the matting powder, the polyethylene wax and other additives according to the formula in required parts by weight, stirring and mixing the materials uniformly at a stirring speed of 1000-;

(2) and dispersing: adding 5-10% of modified polyurethane resin and 10-15% of ternary vinyl chloride-vinyl acetate copolymer resin into a premixing dispersion cylinder, starting a dispersion machine, adding a dispersing agent and 20-30% of single ester solvent at the rotation speed of 300-1500 r/min, fully and uniformly stirring, adding all the mixed materials in the step (1), adding an adhesion promoter, standing for 5-10min, adjusting the rotation speed of the dispersion machine to 1200-1500r/min, and fully stirring to form pre-dispersion color slurry;

(3) and grinding: transferring the pre-dispersed slurry to a sand mill for dispersion, controlling the rotating speed at 1200r/min and the material temperature at 10-50 ℃, controlling the grinding feeding speed at 0.1-0.2MPa, repeatedly grinding for 2-3 times to reach the fineness required by the universal composite ink, and filtering the slurry by using a 200-mesh 500-mesh sieve to obtain the pigment color paste;

(4) adjusting viscosity: adding the residual solvent, the ternary vinyl chloride-vinyl acetate copolymer resin and the modified polyurethane resin into the pigment color paste, starting a dispersion machine to stir and disperse, controlling the rotating speed to be 300-1200r/min, dispersing for 10-15min, and adjusting the viscosity of the ink to prepare the finished product of the composite ink;

(5) and packaging: and filtering the obtained composite ink at low temperature for 5-10min by using a 200-plus-500-mesh sieve, carrying out low-temperature vacuum packaging, and then packaging and warehousing.

Furthermore, the temperature of the low-temperature filtration in the step 5 is 5-15 ℃, and the temperature of the low-temperature vacuum packaging is 5-10 ℃.

The invention has the beneficial effects that: according to the single-solvent high-speed printing plastic composite white ink provided by the invention, the ester solubility of the selected single-solvent polyurethane resin is better, the dissolving capacity of the ester solvent to the ink can be greatly improved, and the transfer performance of the ink is greatly improved; titanium dioxide with high covering power and whiteness, low oil absorption and stable and reliable quality is selected as white ink pigment, and an imported dispersing agent is used as an auxiliary material, so that the titanium dioxide is fully dispersed, resin fully wraps the titanium dioxide, low viscosity and high covering of the ink are ensured, and excellent printability is achieved; when selecting the resin, selecting the resin with better solvent release property, adjusting the proportion of the solvent in the ink, and selecting a proper auxiliary agent to reduce the residue; meanwhile, printing equipment is improved, the temperature of the drying tunnel is increased, the air volume is increased, the air duct is lengthened, and the like; adding a proper amount of defoaming agent and antistatic agent in the production process of the ink, and adding the defoaming agent and the antistatic agent when necessary during printing; the invention takes single ester solvent as the printing ink solvent, has moderate dissolving power and volatilization speed, and meets the requirements of resin synthesis and printing equipment. The solvent in the printing ink is single ester, so that the recovery and rectification of a recovery system are convenient, the rectification purity can reach more than 99 percent, the recovered solvent can be normally used in printing and composite working procedures, and the VOC emission can be reduced to less than 5 percent before recovery. Meanwhile, by optimizing the formula of the printing ink and the raw materials, the printing ink can be used for printing on printing equipment with the printing speed of more than 400 m/min.

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

A single-solvent high-speed printing plastic composite white ink comprises the following components:

modified polyurethane resin: 30 percent of

Ternary vinyl chloride-vinyl acetate copolymer: 10 percent of

Titanium dioxide: 30 percent of

Ester solvent: 26.8 percent

Polyethylene wax: 1 percent of

Matting powder: 1 percent of

Dispersing agent: 0.2 percent of

An adhesion promoter: 1.5 percent

Other auxiliary agents: 0.5 percent.

Example 2

A single-solvent high-speed printing plastic composite white ink comprises the following components:

modified polyurethane resin: 33 percent

Ternary vinyl chloride-vinyl acetate copolymer: 12 percent of

Titanium dioxide: 35 percent of

Ester solvent: 15.4 percent

Polyethylene wax: 0.4 percent

Matting powder: 1 percent of

Dispersing agent: 0.2 percent of

An adhesion promoter: 2 percent of

Other auxiliary agents: 1 percent.

The modified polyurethane resin is a main body connecting material of single-solvent composite white ink, all solvents in the resin are ester solvents, the modified polyurethane resin has good ester solubility, can well wrap pigment particles, can provide excellent adhesive force for ink on the surface of plastic, has an excellent film forming effect, and has water boiling resistance. Modified polyurethane resins are commercially available.

The ternary vinyl chloride-vinyl acetate copolymer resin is auxiliary resin, has excellent dispersibility on pigments, helps to form a film and improves the composite strength of printed matters. The ternary vinyl chloride-vinyl acetate copolymer is commercially available.

Titanium dioxide is a colorant, and the main function of the titanium dioxide is to mix the color of the ink when the single-solvent white ink is manufactured. Titanium dioxide is commercially available.

The polyethylene wax has the function of improving the smoothness of a single solvent ink printed matter, better protecting a printing plate and a scraper during printing, and can be purchased in the market.

The ester solvent is a solvent of the single solvent ink, and is used for dissolving the resin and the pigment, and adjusting the viscosity and the volatilization speed of the ink. Ester solvents are commercially available.

The matting powder has the functions of improving the anti-adhesion performance of the ink, improving the fluidity of the ink, improving the solvent residue and the like. Are commercially available.

The dispersing agent has the functions of improving the dispersing effect of the titanium dioxide and improving the stability of the ink. Are commercially available.

The adhesion promoter acts to improve the adhesion of the ink to the OPP substrate. Are commercially available.

Other additives include auxiliary additives such as antistatic agents, antifoaming agents, and film-forming additives, and are added for various purposes, for example, to improve static and bubble problems during printing and to improve the film-forming effect of the ink layer. Are commercially available.

Further, the other auxiliary agent is one or more of an antistatic agent, a modified silicon type defoaming agent, a film forming auxiliary agent and an ultraviolet absorber.

Further, the ester solvent is one or more selected from ethyl acetate, butyl acetate, isopropyl acetate, ethyl propionate, ethyl butyrate and ethyl lactate.

A preparation method of high-speed printing plastic composite white ink suitable for a single solvent comprises the following specific steps:

(1) dry mixing: accurately weighing the pigment, the matting powder, the polyethylene wax and other additives according to the formula in required parts by weight, stirring and mixing the materials uniformly at a stirring speed of 1000-;

(2) and dispersing: adding 5-10% of modified polyurethane resin and 10-15% of ternary vinyl chloride-vinyl acetate copolymer resin into a premixing dispersion cylinder, starting a dispersion machine, adding a dispersing agent and 20-30% of single ester solvent at the rotation speed of 300-1500 r/min, fully and uniformly stirring, adding all the mixed materials in the step (1), adding an adhesion promoter, standing for 5-10min, adjusting the rotation speed of the dispersion machine to 1200-1500r/min, and fully stirring to form pre-dispersion color slurry;

(3) and grinding: transferring the pre-dispersed slurry to a sand mill for dispersion, controlling the rotating speed at 1200r/min and the material temperature at 10-50 ℃, controlling the grinding feeding speed at 0.1-0.2MPa, repeatedly grinding for 2-3 times to reach the fineness required by the universal composite ink, and filtering the slurry by using a 200-mesh 500-mesh sieve to obtain the pigment color paste;

(4) adjusting viscosity: adding the residual solvent, the ternary vinyl chloride-vinyl acetate copolymer resin and the modified polyurethane resin into the pigment color paste, starting a dispersion machine to stir and disperse, controlling the rotating speed to be 300-1200r/min, dispersing for 10-15min, and adjusting the viscosity of the ink to prepare the finished product of the composite ink;

(5) and packaging: and filtering the obtained composite ink at low temperature for 5-10min by using a 200-plus-500-mesh sieve, carrying out low-temperature vacuum packaging, and then packaging and warehousing.

Wherein the temperature in the step 5 is 5-15 ℃ during low-temperature filtration and 5-10 ℃ during low-temperature vacuum packaging.

According to the single-solvent high-speed printing plastic composite white ink, the ester solubility of the selected single-solvent polyurethane resin is better, the dissolving capacity of the ester solvent to the ink can be greatly improved, and the transfer performance of the ink is greatly improved; titanium dioxide with high covering power and whiteness, low oil absorption and stable and reliable quality is selected as white ink pigment, and an imported dispersing agent is used as an auxiliary material, so that the titanium dioxide is fully dispersed, resin fully wraps the titanium dioxide, low viscosity and high covering of the ink are ensured, and excellent printability is achieved; when selecting the resin, selecting the resin with better solvent release property, adjusting the proportion of the solvent in the ink, and selecting a proper auxiliary agent to reduce the residue; meanwhile, printing equipment is improved, the temperature of the drying tunnel is increased, the air volume is increased, the air duct is lengthened, and the like; adding a proper amount of defoaming agent and antistatic agent in the production process of the ink, and adding the defoaming agent and the antistatic agent when necessary during printing; the invention takes single ester solvent as the printing ink solvent, has moderate dissolving power and volatilization speed, and meets the requirements of resin synthesis and printing equipment. The solvent in the printing ink is single ester, so that the recovery and rectification of a recovery system are convenient, the rectification purity can reach more than 99 percent, the recovered solvent can be normally used in printing and composite working procedures, and the VOC emission can be reduced to less than 5 percent before recovery. Meanwhile, by optimizing the formula of the printing ink and the raw materials, the printing ink can be used for printing on printing equipment with the printing speed of more than 400 m/min.

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.