阅读说明：本技术 一种具有凹印裂变效果的印刷品的制备方法 (Preparation method of printed matter with gravure fission effect ) 是由 刘小文 胡爽 李朝刚 陈明 于 2020-06-12 设计创作，主要内容包括：本发明涉及印刷技术领域,具体涉及一种具有凹印裂变效果的印刷品的制备方法,包括如下步骤：步骤A：通过凹印版将UV裂变油墨印刷于承印基材上；步骤B：将印刷有UV裂变油墨的承印基材依次经过UV引爆处理和UV干燥固化处理,制得具有凹印裂变效果的印刷品。本发明提供的具有凹印裂变效果的印刷品的制备方法操作控制方便,生产效率高,便于工业化大生产,制得的印刷品凹印具有良好的裂变效果,图案质地好,其在承印基材附着力好,具有优良的耐候性和耐弯折性,不易出现黄变褪色以及爆色现象,产品质量稳定。(The invention relates to the technical field of printing, in particular to a preparation method of a printed matter with a gravure fission effect, which comprises the following steps: step A: printing the UV fission ink on a substrate through an intaglio printing plate; and B: and (3) sequentially carrying out UV detonation treatment and UV drying and curing treatment on the printing substrate printed with the UV fission ink to obtain a printed matter with a gravure fission effect. The preparation method of the printed matter with the gravure fission effect, provided by the invention, has the advantages of convenience in operation and control, high production efficiency and convenience in industrial mass production, and the prepared printed matter gravure has a good fission effect, good pattern texture, good adhesive force on a printing substrate, excellent weather resistance and bending resistance, is not easy to cause yellowing, fading and explosion phenomena, and has stable product quality.)

1. A preparation method of a printed matter with a gravure fission effect is characterized by comprising the following steps: the method comprises the following steps:

(1) manufacturing a gravure roller according to the image and text to be printed, and installing the gravure roller on a gravure press;

(2) printing the UV fission ink on a printing substrate by adopting a gravure roller;

(3) detonating the printing substrate printed with the UV fission ink by adopting a UV fission device; and then, carrying out ultraviolet curing and drying treatment on the printing substrate by adopting a UV curing device to obtain a printed matter.

2. The method of preparing a printed matter having a gravure fission effect according to claim 1, wherein: in the step (1), the gravure roller is prepared by adopting a laser engraving method, the section of a mesh of the gravure roller is conical, the depth of the mesh is 70-80 mu m, and the number of engraving lines is 90-100/cm.

3. The method of preparing a printed matter having a gravure fission effect according to claim 1, wherein: in the step (2), the UV fission ink comprises the following raw materials in parts by weight:

4. the method of preparing a printed matter having a gravure fission effect according to claim 3, wherein: the preparation method of the acrylic emulsion comprises the following steps:

s1, under the protection of nitrogen, taking 11-25 parts by weight of isophorone diisocyanate and 0.05-0.15 part by weight of dibutyltin dilaurate, heating to 50-60 ℃, adding 36-46 parts by weight of polytetrahydrofuran diol, reacting at 75-85 ℃ for 90-150min, determining that-NCO reaches a theoretical value, adding 1.5-3.2 parts by weight of 1, 2-dihydroxy-3-sodium propane sulfonate and 5-10 parts by weight of N-methylpyrrolidone, and continuing to react for 90-150min until the determined-NCO reaches the theoretical value to obtain a mixture I;

s2, cooling the mixture I prepared in the step S1 to 45-55 ℃, adding 4-8 parts of hydroxybutyl acrylate, 2-5 parts of 2, 2-dimethylolbutyric acid and 1-3 parts of ethylenediamine, reacting for 60-90min, and adding 10-15 parts of deionized water to obtain a mixture II;

s3, adding 2-3 parts of vinyl triisopropoxysilane, 3-5 parts of polymaleic anhydride and 5-8 parts of initiator into the mixture II prepared in the step S2, dropwise adding 16-22 parts of ethyl methacrylate, reacting at 60-70 ℃ for 90-150min, then adding 15-24 parts of amino resin, stirring and uniformly mixing to obtain the acrylic emulsion.

5. The method of producing a printed matter having a gravure fission effect according to claim 4, wherein: the initiator is at least one of potassium persulfate, ammonium persulfate and sodium persulfate.

6. The method of preparing a printed matter having a gravure fission effect according to claim 3, wherein: each part of the functional auxiliary agent consists of polyethylene wax, polyoxyethylene polyoxypropylene pentaerythritol ether and polydimethylsiloxane according to the weight ratio of 1:1-2:0.8: 1.5.

7. The method of preparing a printed matter having a gravure fission effect according to claim 3, wherein: each part of the active diluent consists of ethoxylated trimethylolpropane triacrylate, hexanediol diacrylate and ethanol according to the weight ratio of 1:0.5-1.5: 3-5.

8. The method of preparing a printed matter having a gravure fission effect according to claim 3, wherein: in the step (2), the preparation method of the UV fission ink comprises the following steps:

step A, fully and uniformly mixing acrylic emulsion, styrene-acrylic resin, reactive diluent and photosensitizer in parts by weight, and stirring at the temperature of 55-65 ℃ for 40-60min to obtain a mixture A;

and step B, adding the modified epoxy resin, the flatting agent and the functional auxiliary agent into the mixture A prepared in the step A according to the parts by weight, stirring at the temperature of 50-60 ℃ for 30-50min, filtering through a 200-mesh gauze to prepare the UV fission ink, and barreling for later use.

9. The method for preparing a printed matter having a gravure fission effect according to claim 1, wherein: in the step (3), the UV fission device comprises a plurality of UV fission lamps arranged on the gravure press, the UV curing device comprises a plurality of UV curing lamps arranged on the gravure press, the number of the UV fission lamps and the number of the UV curing lamps which are turned on are adjusted, and the distance between the UV fission lamps and the printing position in the horizontal direction is 100-200 cm.

10. The method of claim 9, wherein the method comprises the steps of: in the step (3), the power of the UV fission lamp is 15-25kW, and the UV wavelength is 230-280 nm; the power of the UV curing lamp is 12-18kW, and the UV wavelength is 250-320 nm.

Technical Field

The invention relates to the technical field of printing, in particular to a preparation method of a printed matter with a gravure fission effect.

Background

With the progress of society and the improvement of living standard, people put higher demands on printed matters. At present, the printing effect of the printed matter is increasingly diversified, for example, the surface of the printed matter presents various textures or texture effects, such as a gold stamping effect, a holographic effect or a cracking wrinkle effect, and the like, so that the attraction of the packaged printed matter is increased, and the market competitiveness is increased. However, the existing printed matter with fission patterns has the problems of poor fission effect and folding endurance, low adhesion of an ink layer, insufficient durability of products and influence on appearance texture and product grade of the products.

Disclosure of Invention

In order to overcome the defects and shortcomings in the prior art, the invention aims to provide the preparation method of the printed matter with the gravure fission effect, the preparation method is convenient to operate and control, high in production efficiency and convenient for industrial mass production, the prepared printed matter has the advantages of good fission effect, good pattern texture, good adhesion on a printing substrate, excellent weather resistance and bending resistance, yellowing, fading and explosion phenomena are not easy to occur, and the product quality is stable.

The purpose of the invention is realized by the following technical scheme: a preparation method of a printed matter with a gravure fission effect comprises the following steps:

(1) manufacturing a gravure roller according to the image and text to be printed, and installing the gravure roller on a gravure press;

(2) printing the UV fission ink on a printing substrate by adopting a gravure roller;

(3) detonating the printing substrate printed with the UV fission ink by adopting a UV fission device; and then, carrying out ultraviolet curing and drying treatment on the printing substrate by adopting a UV curing device to obtain a printed matter.

The printed matter with the gravure fission effect is prepared by adopting the method, the preparation method is convenient in process operation control, high in production efficiency and convenient for industrial mass production, the prepared printed matter gravure has a good fission effect, the pattern is good in texture, the adhesive force of the prepared printed matter gravure on a printing substrate is good, the printed matter gravure has excellent weather resistance, and the printed matter gravure is not easy to yellow or fade; the folding-resistant printing ink has good bending resistance, when the substrate is subjected to folding indentation, the printing ink at the indentation is not easy to break and expose out of the base paper, so that the color bursting problem is caused, and the prepared product has stable quality and strong practicability.

Further, in the step (1), a laser engraving method is adopted to prepare the gravure roller, the section of a mesh hole of the gravure roller is conical, the depth of the mesh hole is 70-80 mu m, and the number of engraving lines is 90-100/cm. The invention sets various parameters of the shape, the depth and the like of the cells of the gravure roller, so that the precision of gravure printing is high, the graphic and text information gravure on the surface of a printing substrate is clear, and the phenomena of wire drawing, edge blurring and the like do not occur.

Further, in the step (2), the UV fission ink comprises the following raw materials in parts by weight:

according to the invention, the modified epoxy resin, the acrylic emulsion and the styrene-acrylic resin are used as main raw materials, and other raw materials are added, so that the raw materials supplement each other, and good matching is realized; the acrylic emulsion and the styrene-acrylic resin have high compatibility, and are used as stable binders, so that the composite resin consisting of the modified epoxy resin, the acrylic emulsion and the styrene-acrylic resin, an active diluent, a leveling agent and the like are easily and uniformly mixed, the UV fission ink has low harmful gas volatility, good adhesive force, good ductility and easy control of viscosity, the prepared UV fission ink has good water resistance and weather resistance, good adhesive force, is not easy to yellow or fade, the formed pattern has good texture and good fission stereoscopic effect; the adopted diethyl cellulose can effectively adjust the viscosity of the UV fission ink, so that the UV fission ink is easy to be mixed and dispersed with the modified epoxy resin, the acrylic emulsion and the styrene-acrylic resin, the UV fission ink has good adhesive force on a printing substrate and high film forming property, the weather resistance, the moisture absorption resistance and the flexibility of the UV fission ink are improved, and the product quality is stable.

Further, the preparation method of the acrylic emulsion comprises the following steps:

s1, under the protection of nitrogen, taking 11-25 parts by weight of isophorone diisocyanate and 0.05-0.15 part by weight of dibutyltin dilaurate, heating to 50-60 ℃, adding 36-46 parts by weight of polytetrahydrofuran diol, reacting at 75-85 ℃ for 90-150min, determining that-NCO reaches a theoretical value, adding 1.5-3.2 parts by weight of 1, 2-dihydroxy-3-sodium propane sulfonate and 5-10 parts by weight of N-methylpyrrolidone, and continuing to react for 90-150min until the determined-NCO reaches the theoretical value to obtain a mixture I;

s2, cooling the mixture I prepared in the step S1 to 45-55 ℃, adding 4-8 parts of hydroxybutyl acrylate, 2-5 parts of 2, 2-dimethylolbutyric acid and 1-3 parts of ethylenediamine, reacting for 60-90min, and adding 10-15 parts of deionized water to obtain a mixture II;

s3, adding 2-3 parts of vinyl triisopropoxysilane, 3-5 parts of polymaleic anhydride and 5-8 parts of initiator into the mixture II prepared in the step S2, dropwise adding 16-22 parts of ethyl methacrylate, reacting at 60-70 ℃ for 90-150min, then adding 15-24 parts of amino resin, stirring and uniformly mixing to obtain the acrylic emulsion.

The modified acrylic emulsion is prepared by matching raw materials such as isophorone diisocyanate, polytetrahydrofuran diol, vinyl triisopropoxysilane and the like; according to the invention, by adopting the raw materials and the preparation process, a carbon-carbon double bond is introduced at the tail end of polyurethane, and is subjected to copolymerization modification with ethyl methacrylate, vinyl triisopropoxysilane and polymaleic anhydride to form a polymer with a certain crosslinking degree, and the polymer is matched with amino resin to increase the crosslinking degree of a system and improve the water resistance, weather resistance and adhesive force.

Further, the amino resin is preferably, but not limited to, cyanote Cymel 325 amino resin. Further, the styrene-acrylic resin is preferably, but not limited to, Joncryl HPD 96MEA that is a styrene-acrylic resin of Basff.

Further, the relative molecular weight of the polymaleic anhydride is 400-800, and the solid content is 49-57%.

Further, the initiator is at least one of potassium persulfate, ammonium persulfate and sodium persulfate.

Further, the antioxidant is at least one of antioxidant 1010, antioxidant 168, antioxidant 2112 and antioxidant 703. By adopting the antioxidant, the antioxidant performance of the UV fission ink is improved.

Furthermore, each part of the photosensitizer consists of 1-hydroxy-cyclohexyl-phenyl ketone, 2,4, 6-trimethylbenzoyl diphenyl phosphine oxide and trimethylolpropane tertiary acrylated tertiary amine according to the weight ratio of 2:2-4: 1-1.5. According to the invention, 1-hydroxy-cyclohexyl-phenyl ketone and 2,4, 6-trimethylbenzoyl diphenyl phosphine oxide are taken as main photosensitizers, trimethylolpropane tertiary acrylated tertiary amine is taken as a photosensitive sensitizer, the fusion promoting effect is good, the initiation efficiency is high, the photocuring speed can be accelerated, the internal shrinkage of an ink system is weakened or avoided, the ink is not easy to yellow after being cured and formed, and the weather resistance, the aging resistance and the folding resistance of the ink are improved.

Furthermore, each part of the functional auxiliary agent consists of polyethylene wax, polyoxyethylene polyoxypropylene pentaerythritol ether and polydimethylsiloxane according to the weight ratio of 1:1-2: 2-3. According to the invention, the polyethylene wax is matched with the polyoxyethylene polyoxypropylene pentaerythritol ether and the polydimethylsiloxane, and the dosage ratio of the polyethylene wax is controlled, so that the weather resistance and the wear resistance of the printing ink can be improved, the polyethylene wax has an excellent internal lubricating effect in a system, a printing ink layer has good gloss and stereoscopic impression, and the texture and the fission effect of a pattern are improved.

Furthermore, each part of the reactive diluent consists of ethoxylated trimethylolpropane triacrylate and hexanediol diacrylate deionized water according to the weight ratio of 1: 0.5-1.5. The invention adopts the hexanediol diacrylate and the ethoxylated trimethylolpropane triacrylate as the active diluent of the UV photocuring printing ink, has good compatibility with other raw materials, can adjust the viscosity of the printing ink and play a role in dispersion, participates in the curing reaction of the UV printing ink, can improve the curing speed of the UV printing ink, improves the weather resistance and the water resistance of a UV printing ink system, enhances the adhesive force of a printing ink printing layer, is not easy to yellow or fade, and has good folding resistance.

Further, the preparation method of the modified epoxy resin comprises the following steps: uniformly mixing 46-54 parts by weight of epoxy resin and 0.2-0.5 part by weight of hydroquinone, heating to 85-95 ℃, continuously stirring and heating, dropwise adding a mixture consisting of 0.2-0.4 part by weight of N, N-dimethylaniline, 0.1-0.2 part by weight of triethylamine and 8-14 parts by weight of hydroxyethyl acrylate within 30-40min, reacting for 4-6h, sampling and testing the acid value, cooling to below 85 ℃ when the acid value is less than 3, and discharging to obtain the modified epoxy resin.

The modified epoxy resin is prepared by the preparation method, and the process steps and the process parameters are strictly controlled to obtain the modified epoxy resin; according to the invention, hydroxyethyl acrylate, N-dimethylaniline and triethylamine are mixed to form carboxylate anion active groups, so that the reaction rate of epoxy group ring-opening esterification is greatly improved, and the epoxy group anion active groups are uniformly dispersed in a UV fission ink system; the prepared modified epoxy resin has stable performance, is uniformly dispersed in a system, endows the UV fission ink with good toughness and low internal stress, avoids the problems of edge rising, cracking and the like, has good weather resistance, water resistance and heat resistance, and has good folding resistance.

Further, the epoxy resin is preferably, but not limited to, bisphenol a type epoxy resin E51.

Further, in the step (2), the gravure printing speed is 19000 sheets/h to 25000 sheets/h. By adopting the preparation method of the printed matter, the gravure printing speed can be 19000-25000 sheets/h, 145-155 m/min. The product has high production efficiency, low production cost and stable product quality, and is beneficial to industrial mass production.

Further, in the step (3), the UV fission device includes a plurality of UV fission lamps disposed on the gravure press, the UV curing device includes a plurality of UV curing lamps disposed on the gravure press, the gravure press is provided with a paper guide conveyor belt for conveying a substrate to be printed, the number of the UV fission lamps and the number of the UV curing lamps to be turned on are adjusted, and the distance between the UV fission lamps and the printing position in the horizontal direction is 100-200 cm.

Further, in the step (3), the power of the UV fission lamp is 15-25kW, and the UV wavelength is 230-280 nm; the power of the UV curing lamp is 12-18kW, the UV wavelength is 250-320nm, and the curing and drying temperature is 37-47 ℃. Further, the number of the UV fission lamps is 3 to 5, and the number of the UV curing lamps is 4 to 5.

According to the invention, by strictly controlling the UV wavelength of the power of the UV fission lamp and the UV curing lamp, the pattern texture of the cured printing ink pattern layer is good, the surface layer of the printing ink layer generates curing shrinkage to form a fission effect, the printing ink pattern layer is not easy to have the phenomena of yellowing, fading and the like, the weather resistance is good, the adhesive force on a printing substrate is strong, and the printing ink pattern layer is not easy to fall off.

Further, the preparation method of the UV fission ink comprises the following steps:

step A, fully and uniformly mixing acrylic emulsion, styrene-acrylic resin, reactive diluent and photosensitizer in parts by weight, and stirring at the temperature of 55-65 ℃ for 40-60min to obtain a mixture A;

and step B, adding the modified epoxy resin, the flatting agent and the functional auxiliary agent into the mixture A prepared in the step A according to the parts by weight, stirring at the temperature of 50-60 ℃ for 30-50min, filtering through a 200-mesh gauze to prepare the UV fission ink, and barreling for later use.

According to the invention, by strictly controlling the UV wavelength of the power of the UV fission lamp and the UV curing lamp, the pattern texture of the cured printing ink pattern layer is good, the surface layer of the printing ink layer generates curing shrinkage to form a fission effect, the printing ink pattern layer is not easy to have the phenomena of yellowing, fading and the like, the weather resistance is good, the adhesive force on a printing substrate is strong, and the printing ink pattern layer is not easy to fall off.

The invention has the beneficial effects that: the preparation method of the printed matter with the gravure fission effect, provided by the invention, has the advantages of convenience in operation and control, high production efficiency and convenience in industrial mass production, and the prepared printed matter gravure has a good fission effect, good pattern texture, good adhesive force on a printing substrate, excellent weather resistance and bending resistance, is not easy to cause yellowing, fading and explosion phenomena, and has stable product quality.

Detailed Description

The present invention will be further described with reference to the following examples for facilitating understanding of those skilled in the art, and the description of the embodiments is not intended to limit the present invention.