阅读说明：本技术 一种胶印油墨及其制备方法 (Offset printing ink and preparation method thereof ) 是由 陈庆阳 王银磊 徐天平 徐均平 徐西峰 尚玉来 于 2020-07-22 设计创作，主要内容包括：本申请涉及一种胶印油墨及其制备方法,属于印刷油墨领域,所述胶印油墨包括以重量份数计的聚丙烯酸酯改性环氧树脂35-50份、大豆油50-70份、桐油15-20份、矿油0-3份、聚乙烯蜡5-10份、导电剂3-6份、填充料4-10份、连结料25-30份。所述制备方法,包括如下步骤：(1)将聚丙烯酸酯改性环氧树脂、聚乙烯蜡、导电剂、填充料混合均匀；(2)将大豆油、桐油、矿油、连结料混合均匀：(3)将步骤(2)中的混合料分多次加入步骤(1)中的混合料并混合均匀,得胶印油墨。本申请具有粘结力强,减少油墨印刷过程中飞墨的优点。(The offset printing ink comprises, by weight, 35-50 parts of polyacrylate modified epoxy resin, 50-70 parts of soybean oil, 15-20 parts of tung oil, 0-3 parts of mineral oil, 5-10 parts of polyethylene wax, 3-6 parts of a conductive agent, 4-10 parts of a filler and 25-30 parts of a binder. The preparation method comprises the following steps: (1) uniformly mixing polyacrylate modified epoxy resin, polyethylene wax, a conductive agent and a filling material; (2) mixing soybean oil, tung oil, mineral oil and binder uniformly: (3) and (3) adding the mixture obtained in the step (2) into the mixture obtained in the step (1) for multiple times, and uniformly mixing to obtain the offset printing ink. The ink has the advantages of strong bonding force and reduced ink flying in the printing process of the ink.)

1. The offset printing ink is characterized by comprising the following raw materials in parts by weight: 35-50 parts of polyacrylate modified epoxy resin, 50-70 parts of soybean oil, 15-20 parts of tung oil, 0-3 parts of mineral oil, 5-10 parts of polyethylene wax, 3-6 parts of a conductive agent, 4-10 parts of a filling material and 25-30 parts of a bonding material;

the polyacrylate modified epoxy resin is prepared by mixing modified polyol-acrylate copolymer emulsion and epoxy resin with an initiator in nitrogen and carrying out graft copolymerization reaction;

the weight ratio of the modified polyol-acrylate copolymer emulsion to the epoxy resin to the initiator is 28-36: 70-90: 0.31-0.33.

2. The offset ink as claimed in claim 1, wherein the modified polyol-acrylate copolymer emulsion is prepared by the following method:

heating reaction monomers containing fluoroolefin, allyl ether acrylate and dihydric alcohol in a weight ratio of 35-39:6.2-6.5:25.5-25.9 to 60-120 ℃ under the condition of nitrogen, adding an alkaline catalyst, and carrying out heat preservation reaction at the temperature of 80-100 ℃ for 1-4 hours to obtain the modified polyol-acrylate copolymer emulsion.

3. The offset ink as claimed in claim 2, wherein the basic catalyst is at least one selected from the group consisting of alkali metal hydroxides, alkaline earth metal hydroxides, carbonates, and metal alcoholates.

4. An offset ink according to claim 3, wherein said alkali metal hydroxide is selected from at least one of sodium hydroxide and potassium hydroxide; the metal alcoholate is selected from methoxide.

5. The offset ink of claim 2 wherein the fluoroolefin is at least one member selected from the group consisting of tetrafluoroethylene, vinylidene fluoride, vinyl fluoride, and trichloroethylene.

6. An offset ink according to claim 2, wherein said diol is at least one selected from the group consisting of propylene glycol, 1, 4-butanediol, and neopentyl glycol.

7. A printing ink as claimed in claim 1 wherein said vehicle is a polyvinyl butyral resin.

8. The offset ink of claim 1 wherein the filler comprises potassium fatty acid soap, barium sulfate and colloidal calcium carbonate in a weight ratio of 1:1: 1.

9. An offset ink according to claim 1, wherein said initiator is xylene.

10. A method of preparing a flexographic ink according to any of claims 1 to 9, characterized in that it comprises the following steps:

(1) uniformly mixing polyacrylate modified epoxy resin, polyethylene wax, a conductive agent and a filling material:

(2) mixing soybean oil, tung oil, mineral oil and binder uniformly:

(3) and (3) adding the mixture obtained in the step (2) into the mixture obtained in the step (1) for multiple times, and uniformly mixing to obtain the offset printing ink.

Technical Field

The application relates to the field of printing ink, in particular to offset printing ink and a preparation method thereof.

Background

The printing ink is an important material for printing packaging materials, which is used for expressing patterns and characters on a printing stock through printing, and comprises a main component and an auxiliary component which are uniformly mixed and repeatedly rolled to form a viscous colloidal fluid. The main components comprise pigment and binder, the pigment refers to pigment and dye, the binder plays a role of medium for dispersing the pigment and auxiliary materials, has certain fluidity, forms a film layer with certain strength after drying, plays a role in protecting the pigment and enables the pigment to be difficult to fall off, and the auxiliary components comprise filler, thinner, anti-skinning agent, anti-offset agent, slipping agent and other auxiliary agents.

A new formulation of offset ink using oil-in-water type resin emulsion is disclosed in prior application publication No. CN103194120A, which comprises the following components in parts by mass: 60% of a binder; 10% of pigment; 30% of ink oil; 10% of oil-in-water type resin and 20% of an auxiliary agent, wherein the binder is rosin modified phenolic resin and is prepared by the following steps: performing phenolic condensation; adding the condensed phenolic aldehyde; and (5) performing esterification reaction to obtain a semi-finished product.

The ink uses a rosin modified phenolic resin as a vehicle and an oil-in-water resin as an additive. During the stirring and mixing process of the ink, the oil-in-water type resin is combined and emulsified with the ink, the ink is easily changed into emulsion, the viscosity of the ink is reduced, and the ink is easily pulled into filaments and broken during high-speed printing to cause ink flying, so that the printing quality is influenced.

Disclosure of Invention

The utility model provides an offset printing ink, it has the adhesion reinforce, reduces the advantage of printing ink printing in-process ink flying to exist to the not enough of prior art.

In order to achieve the above purpose, the present application provides the following technical solutions:

the offset printing ink comprises the following raw materials in parts by weight: 35-50 parts of polyacrylate modified epoxy resin, 50-70 parts of soybean oil, 15-20 parts of tung oil, 0-3 parts of mineral oil, 5-10 parts of polyethylene wax, 3-6 parts of a conductive agent, 4-10 parts of a filling material and 25-30 parts of a bonding material;

the polyacrylate modified epoxy resin is prepared by mixing modified polyol-acrylate copolymer emulsion and epoxy resin with an initiator in nitrogen and carrying out graft copolymerization reaction;

the weight ratio of the modified polyol-acrylate copolymer emulsion to the epoxy resin to the initiator is 28-36: 70-90: 0.31-0.33.

By adopting the technical scheme, the epoxy resin has the advantages of high adhesive force, chemical resistance, high curing speed, wear resistance and the like, the modified polyol-acrylate copolymer emulsion and the epoxy resin are subjected to graft copolymerization to form a graft copolymer, and the graft copolymer has the advantages of chemical corrosion resistance, strong adhesive force, high curing speed and high viscosity; the conductive performance of the whole ink is improved by adding the conductive agent, the charge concentration is reduced, and the viscosity of the ink is improved; the graft reaction of the modified polyol-acrylate copolymer emulsion and the epoxy resin is improved through the initiator, the adhesive force of the offset printing ink is kept unchanged, and the breaking elongation of the offset printing ink is increased; the filling material is easier to bond with the bonding material in the printing ink, and the components are mixed more uniformly; the adhesion among the components of the offset printing ink is improved through the synergistic effect among the components, and the elasticity and the toughness of the offset printing ink are improved; the proportion of soybean oil and tung oil in the offset printing ink is utilized, the use of mineral oil is reduced, the use of renewable resources is improved, the use amount of aromatic hydrocarbon substances is reduced, the carbon emission in the production links of offset printing ink products and raw materials is reduced, the soybean oil and the tung oil added in the printing ink can improve the transferability and the transferability of the printing ink, and the printing ink is easy to transfer in the use process and reduces the phenomenon of ink misting. Therefore, the effects of strong adhesion and reduced ink flying in the ink printing process are obtained.

Further, the modified polyol-acrylate copolymer emulsion is prepared by adopting the following method:

heating reaction monomers containing fluoroolefin, allyl ether acrylate and dihydric alcohol in a weight ratio of 35-39:6.2-6.5:25.5-25.9 to 60-120 ℃ under the condition of nitrogen, adding an alkaline catalyst, and carrying out heat preservation reaction at the temperature of 80-100 ℃ for 1-4 hours to obtain the modified polyol-acrylate copolymer emulsion. By adopting the technical scheme, the dihydric alcohol is introduced into the allyl ether acrylate, so that the modified polyol-acrylate copolymer emulsion has certain hydrophilicity and adjustable hardness, the fluorine-containing polymer is formed by adding the fluoroolefin, and the modified polyol-acrylate copolymer emulsion is prepared according to the proportion of the raw materials, so that the anti-sticking property and the toughness of the offset printing ink can be improved.

Further, the basic catalyst is at least one selected from the group consisting of alkali metal hydroxides, alkaline earth metal hydroxides, carbonates, and metal alcoholates.

By adopting the technical scheme, the reaction rate of the modified polyol-acrylate copolymer emulsion is accelerated.

Further, the alkali metal hydroxide is selected from at least one of sodium hydroxide and potassium hydroxide; the metal alcoholate is selected from methoxide.

By adopting the technical scheme, the alkaline catalyst is optimized, and the reaction rate of the modified polyol-acrylate copolymer emulsion is further improved.

Further, the fluoroolefin is selected from at least one of tetrafluoroethylene, vinylidene fluoride, vinyl fluoride and trichloro-fluoroethylene.

By adopting the technical scheme, the fluoroolefin contains carbon-carbon double bonds and can form a fluorine-containing polymer with the modified polyol-acrylate copolymer emulsion, and the anti-adhesion property and toughness of the modified polyol-acrylate copolymer emulsion can be improved by adding fluorine atoms.

Further, the dihydric alcohol is at least one selected from propylene glycol, 1, 4-butanediol and neopentyl glycol.

By adopting the technical scheme, the modified polyalcohol-acrylate copolymer emulsion has certain hydrophilicity through the reaction of the dihydric alcohol and the allyl ether acrylate.

Further, the binder is polyvinyl butyral resin.

By adopting the technical scheme, the polyvinyl butyral resin is used as a binder, and the polyvinyl butyral resin is grafted with the polyacrylate modified epoxy resin, so that the adhesion among the components can be enhanced, the toughness of the ink is increased, and the offset printing ink has good impact resistance, excellent transparency and extremely strong adhesion.

Further, the filling material comprises fatty acid potassium soap, barium sulfate and colloidal calcium carbonate in a weight ratio of 1:1: 1.

By adopting the technical scheme, the colloidal calcium carbonate and the barium sulfate can be uniformly dispersed in the printing ink and exist in a suspension state in the printing ink, and cannot be settled. The fatty acid potassium soap is wrapped outside the colloidal calcium carbonate and the barium sulfate, the surface of the colloidal calcium carbonate and the barium sulfate is in a porous structure, the fatty acid potassium soap is easily adsorbed on the surfaces of the colloidal calcium carbonate and the barium sulfate, and a colloidal layer is formed on the surfaces of the colloidal calcium carbonate and the barium sulfate. Meanwhile, the fatty acid potassium soap has a defoaming function, so that bubbles in the printing ink can be effectively reduced.

Further, the initiator is xylene.

By adopting the technical scheme, the grafting reaction of the modified polyol-acrylate copolymer emulsion and the epoxy resin is improved, the adhesive force of the offset printing ink is kept unchanged, and the breaking elongation of the offset printing ink is increased.

The offset printing ink prepared by the preparation method has the advantages of strong cohesive force and reduced ink flying in the printing process of the ink.

In order to achieve the above purpose, the present application provides the following technical solutions:

a preparation method of offset printing ink comprises the following steps:

(1) uniformly mixing polyacrylate modified epoxy resin, polyethylene wax, a conductive agent and a filling material:

(2) mixing soybean oil, tung oil, mineral oil and binder uniformly:

(3) and (3) adding the mixture obtained in the step (2) into the mixture obtained in the step (1) for multiple times, and uniformly mixing to obtain the offset printing ink.

By adopting the technical scheme, the modified polyol-acrylate copolymer emulsion and the epoxy resin are mixed, the grafting reaction of the modified polyol-acrylate copolymer emulsion and the epoxy resin is accelerated under the action of the initiator to prepare the graft copolymer, and then the polyethylene wax and the conductive agent are mixed into the graft copolymer under the action of the filling material and the bonding material to increase the toughness of the ink, so that the offset ink has good impact resistance, excellent transparency and strong cohesiveness.

In summary, the present application has the following beneficial effects:

firstly, the modified polyol-acrylate copolymer emulsion and the epoxy resin are subjected to graft copolymerization to form a graft copolymer, so that the offset printing ink is high in curing speed and high in viscosity; soybean oil and tung oil are added into offset printing ink to improve the transferability and transferability of the printing ink and reduce ink flying, so that the cohesive force of the offset printing ink is improved and the ink flying in the printing process of the printing ink is reduced;

second, a modified polyol-acrylate copolymer emulsion was prepared by the method of the present application: and the offset printing ink is prepared by modifying the polyalcohol-acrylate copolymer emulsion and other raw materials.

Detailed Description

The present application will be described in further detail with reference to examples.

TABLE 1 examples 1-7 raw material compositions for flexographic inks

The above examples 1-7 were prepared as follows:

preparation of modified polyol-acrylate copolymer emulsion: adding dihydric alcohol and fluoroolefin into allyl ether acrylate under the condition of nitrogen, stirring the mixture for reaction at the temperature of 120 ℃, adding a catalyst, stirring the mixture for reaction at the temperature of 100 ℃, wherein the reaction time is 7 hours, and neutralizing the obtained mixture in hydrochloric acid until the pH value is 7 to obtain the modified polyol-acrylate copolymer emulsion.

Preparation of polyacrylate modified epoxy resin emulsion: and (2) mixing the obtained modified polyol-acrylate copolymer emulsion with epoxy resin under the condition of nitrogen, heating and stirring to 120 ℃, dropwise adding xylene into the mixture of the modified polyol-acrylate copolymer emulsion and the epoxy resin at a certain speed within 2 hours, simultaneously heating to 150 ℃, carrying out heat preservation reaction for 3 hours, then cooling to 80 ℃, adjusting the pH value to 7, and carrying out heat preservation reaction for 1 hour to obtain the polyacrylate modified epoxy resin emulsion.

Preparation of offset printing ink:

(1) heating and stirring the obtained modified polyol-acrylate copolymer emulsion, polyethylene wax, a conductive agent and a filler, heating to 110 ℃, carrying out heat preservation reaction for 4 hours at the rotating speed of 400r/min, then cooling to 50 ℃, adjusting the pH value to 7, and carrying out heat preservation reaction for 1 hour to obtain the premix. Wherein the conductive agent is carbon black, and the particle size of the carbon black is 16-20 nm; the filling material is prepared by mixing and stirring fatty acid potassium soap, barium sulfate and colloidal calcium carbonate according to the proportion shown in the table 1;

(2) mixing soybean oil, oleum Verniciae Fordii, mineral oil, and polyvinyl butyral resin, stirring for 15min to obtain mixture;

(3) and adding the mixture into the premix for four times, mixing and stirring for 2 hours at the rotating speed of 400r/min to prepare the offset printing ink.