A water-based gloss ink for enhancing the adhesion of printed matter and a method for preparing the same

Abstract

The application discloses a water-based varnish for enhancing the adhesion of printed matter and a preparation method thereof. The water-based varnish for enhancing the adhesion of printed matter comprises the following components in parts by weight: 20-30 parts of water-based resin, 40-50 parts of water-based emulsion, 25-35 parts of solvent, and 5-15 parts of auxiliary agent. The water-based resin is a mixture of water-soluble rosin modified maleic acid resin and polyvinyl alcohol. The water-based emulsion is a mixture of styrene acrylic emulsion and pure acrylic emulsion. The water-based varnish provided by the application not only can maintain the original appearance, has excellent 4-cup viscosity, coating film gloss and abrasion resistance, but also can ensure that the paper printed matter after varnishing has no damage on the surface after adhesion test. The printed matter with no damage after adhesion test can be obtained by printing the conventional offset printing ink first and then printing the water-based varnish of the application. The preparation method of the water-based varnish for enhancing the adhesion of printed matter is simple, short in production cycle and high in efficiency.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of water-based glazing, in particular to a water-based glazing oil with enhanced adhesion of printed matter and a preparation method thereof. BACKGROUND

[0002] In the printing field, the glazing process of paper products has been widely used in the packaging decoration of commodities. Although the traditional BOPP and PET plastic film compounding process has the advantages of high gloss, aesthetic durability, etc., it is not conducive to the recycling of waste paper and causes pollution to the environment. The water-based glazing and UV glazing processes are two common surface treatment processes in packaging printing at present. The water-based glazing process is widely applied to packaging printing due to its environmental protection and low cost, and gradually replaces the UV glazing process. However, the water-based glazing printed matter has the following defects compared with the UV glazing printed matter. After the adhesion test, the printed matter is torn and shredded by the adhesive tape, which limits the reuse of the packaging box. Since most packaging boxes need to be sealed with sealing glue, it not only brings certain pressure to waste paper treatment and environmental protection, but also brings great trouble to ink manufacturers and printing manufacturers. SUMMARY

[0003] In order to overcome the shortcomings of the prior art, the first object of the present application is to provide a water-based glazing oil with enhanced adhesion of printed matter. The water-based glazing oil with enhanced adhesion of printed matter provided by the present application not only can maintain the original appearance, has excellent 4-cup viscosity, coating film gloss and abrasion resistance, but also can ensure that the paper printed matter after glazing has no damage on the surface after the adhesion test.

[0004] The second object of the present application is to provide a preparation method of the water-based glazing oil with enhanced adhesion of printed matter.

[0005] The first object of the present application is achieved by adopting the following technical scheme:

[0006] The water-based glazing oil with enhanced adhesion of printed matter comprises the following components in parts by weight: 20-30 parts of water-based resin, 40-50 parts of water-based emulsion, 25-35 parts of solvent, and 5-15 parts of auxiliary agent. The water-based resin is a mixture of water-soluble rosin modified maleic acid resin and polyvinyl alcohol. The water-based emulsion is a mixture of styrene acrylic emulsion and pure acrylic emulsion.

[0007] Further, the weight ratio of the water-soluble rosin modified maleic acid resin and polyvinyl alcohol is 3:(0.5-1), and the weight ratio of the styrene acrylic emulsion and the pure acrylic emulsion is 5:(1-2).

[0008] Further, the water-soluble rosin modified maleic acid resin is prepared by a preparation method comprising the following steps:

[0009] The water-soluble rosin modified maleic acid resin is prepared by mixing rosin and water, heating to melt the rosin, introducing nitrogen, adding a decoloring agent to react, then adding fumaric acid to react, and finally adding pentaerythritol to react.

[0010] Further, the mass ratio of rosin:water:decoloring agent:fumaric acid:pentaerythritol is 100:(1-5):(0.1-1):(10-20):(5-15); the temperature when adding the decoloring agent is 160-170 DEG C, the reaction condition when adding the decoloring agent is 270-280 DEG C for 4-6 hours; the temperature when adding the fumaric acid is 170-180 DEG C, the reaction condition when adding the fumaric acid is 200-240 DEG C for 4-6 hours; the reaction condition when adding the pentaerythritol is 200-240 DEG C for 30-40 hours.

[0011] Further, the acid value of the water-soluble rosin modified maleic acid resin is 155-175 mgKOH / g, and the pH value is 8-9; the viscosity of the polyvinyl alcohol is 43-65 cps, the pH value is 5-7, and the solubility is 86-90.

[0012] Further, the solid content of the styrene-acrylate emulsion is 47-49%, the viscosity at 25 DEG C is <2000 cps, the particle diameter is 0.1-0.2 mu m, and the pH value is 7-9; the solid content of the pure acrylic emulsion is 50+ / -2%, the viscosity is 100-500 mpa.s at 25 DEG C, and the pH value is 7-9.

[0013] Further, the solvent is a mixed solvent of alcohol and water, and the volume ratio of water to alcohol is (85-95):(5-15).

[0014] Further, the auxiliary agent includes a wetting agent, a leveling agent, an anti-wear agent, and an antifoaming agent, and the weight ratio of the wetting agent, the leveling agent, the anti-wear agent, and the antifoaming agent is (0.1-1):(1-3):(5-10):(0.1-1); the wetting agent is one or a combination of two or more of ethanol, propylene glycol, and glycerol; the leveling agent is one or a combination of two of an acrylic leveling agent and a silicone leveling agent; the anti-wear agent is one or a combination of two or more of PE wax, PP wax, and PTFE wax; and the antifoaming agent is one or a combination of two of a non-silicon antifoaming agent and a silicone antifoaming agent.

[0015] The second object of the application is achieved by using the following technical scheme:

[0016] A preparation method of a water-based gloss oil for enhancing the adhesion of printed matter, comprising the following steps:

[0017] (1) ingredients are weighed according to the formula, a water-based resin is dissolved in a solvent, and the mixture is uniformly mixed to obtain a mixture;

[0018] (2) adding water-based emulsion and auxiliary to the mixture of step (1) and stirring uniformly to obtain the water-based gloss oil for enhancing the adhesion of printed matter.

[0019] Further, the specific process of step (1) is as follows: after each component is weighed according to the formula, the solvent is heated to 70-80℃, then the water-based resin is added, and stirring is carried out at a speed of 300-500 r / min for 10-20 min, and then the temperature is raised to 85-90℃ and kept for 20-40 min to obtain the mixture; the specific process of step (2) is as follows: after the mixture of step (1) is cooled to 40-50℃, the water-based emulsion is added, and stirring is carried out at a speed of 500-1000 r / min for 20-30 min, and then the auxiliary is added, and stirring is carried out at a speed of 500-1000 r / min for 20-30 min, and finally the water-based gloss oil for enhancing the adhesion of printed matter is obtained.

[0020] Compared with the prior art, the water-based gloss oil for enhancing the adhesion of printed matter provided by the application has the following beneficial effects:

[0021] (1) The water-based gloss oil for enhancing the adhesion of printed matter provided by the application not only can maintain the original appearance, has excellent coating-4 cup viscosity, coating film gloss and abrasion resistance, but also can ensure that the paper printed matter after glossing has no damage on the surface after adhesion test. The water-soluble rosin modified maleic acid resin has good solubility but slow and slow drying, and the polyvinyl alcohol has relatively poor solubility but strong and fast adhesion, and the combination of the two can make up for the shortcomings. The styrene acrylic emulsion has good adhesion, and the water resistance and alkali resistance are better than those of the pure acrylic emulsion, and the pure acrylic emulsion has stronger aging resistance and anti-back-sticking, and the combination of the two can make up for the shortcomings. The conventional offset printing ink is printed first, and then the water-based gloss oil for enhancing the adhesion of printed matter is printed, and the offset printing ink and the water-based gloss oil for enhancing the adhesion of printed matter have good affinity, so that the printed matter has strong adhesion and no damage after adhesion test.

[0022] (2) The water-based gloss oil for enhancing the adhesion of printed matter provided by the application does not need to wait until the offset printing ink printed first is dry before printing, and the water-based gloss oil for enhancing the adhesion of printed matter can be printed on-line with the offset printing ink, which shortens the entire printing cycle, improves the printing efficiency and reduces the cost. In addition, the preparation method of the water-based gloss oil for enhancing the adhesion of printed matter is simple, and the production cycle is short and the efficiency is high. DETAILED DESCRIPTION

[0023] The application can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the application more thorough and comprehensive.

[0024] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description herein is for describing particular embodiments only and is not intended to be limiting of the application. The use herein of the terms "and / or" includes a set of one or more associated listed items.

[0025] The water-based gloss oil for enhancing the adhesion of printed matter comprises the following components in parts by weight: 20-30 parts of water-based resin, 40-50 parts of water-based emulsion, 25-35 parts of solvent, and 5-15 parts of auxiliary agent; the water-based resin is a mixture of water-soluble rosin-modified maleic acid resin and polyvinyl alcohol; and the water-based emulsion is a mixture of styrene-acryl emulsion and pure acrylic emulsion.

[0026] The water-based gloss oil for enhancing the adhesion of printed matter provided by the application not only can maintain the original appearance, has excellent 4-cup viscosity, coating film gloss and abrasion resistance, but also can ensure that the paper printed matter after polishing has no damage on the surface after adhesion test. The water-soluble rosin-modified maleic acid resin has good solubility but slow drying, the polyvinyl alcohol has relatively poor solubility but strong adhesion and fast drying, and the combination of the two can make up for the deficiencies. The styrene-acryl emulsion has good adhesion, better water resistance and alkali resistance than the pure acrylic emulsion, and the pure acrylic emulsion has stronger aging resistance and anti-back-sticking, and the combination of the two can make up for the deficiencies. After printing the conventional offset printing ink and then printing the water-based gloss oil for enhancing the adhesion of printed matter provided by the application, the printed matter after adhesion test has no damage.

[0027] In one embodiment, the weight ratio of the water-soluble rosin-modified maleic acid resin to the polyvinyl alcohol is 3:(0.5-1), and the weight ratio of the styrene-acryl emulsion to the pure acrylic emulsion is 5:(1-2).

[0028] When the water-based resin and the water-based emulsion are in the above ratio, the adhesion of the water-based gloss oil is further improved.

[0029] In one embodiment, the water-soluble rosin-modified maleic acid resin is prepared by a preparation method comprising the following steps:

[0030] The rosin and water are mixed, heated to melt the rosin, nitrogen is introduced, a decolorizing agent is added for reaction, then fumaric acid is added for reaction, and then pentaerythritol is added for reaction, and the water-soluble rosin-modified maleic acid resin is obtained after the reaction is completed.

[0031] In one embodiment, the mass ratio of rosin:water:decoloring agent: fumaric acid: pentaerythritol is 100:(1-5):(0.1-1):(10-20):(5-15); the temperature at which the decoloring agent is added is 160-170°C, the reaction conditions for adding the decoloring agent are 270-280°C for 4-6 hours; the temperature at which the fumaric acid is added is 170-180°C, the reaction conditions for adding the fumaric acid are 200-240°C for 4-6 hours; the reaction conditions for adding the pentaerythritol are 200-240°C for 30-40 hours.

[0032] Further, after adding the pentaerythritol, the solubility in methanol, ethanolamine and ammonia and the acid value are tested every 1 hour.

[0033] In one embodiment, the water-soluble rosin modified maleic acid resin has an acid value of 155-175 mgKOH / g and a pH of 7-9; the polyvinyl alcohol has a viscosity of 43-65 cps, a pH of 5-7 and a solubility of 86-90.

[0034] The water-soluble rosin modified maleic acid resin has a light yellow transparent block appearance, a softening point (ring and ball method) of 145-155°C, a color (Gardner color number) of ≤7, an acid value (mgKOH / g) of 155-175, and a pH of 8.5. The ethanolamine solubility is transparent, the methanol solubility (%) is ≥1000, and the resin:water:isopropyl alcohol ratio is 40:48:12.

[0035] The polyvinyl alcohol has a white solid powder appearance, a purity of >93.5%, and a content of 99.5%. The polyvinyl alcohol is prepared by the following steps: 3g of PVAC resin is placed in a three-necked flask with a condenser and a stirrer, 30ml of methanol is added, stirring, heating, and the temperature is controlled at 40°C; after the resin is completely dissolved, the temperature is cooled to 35°C, and 2ml of a previously prepared NaOH-CH3OH solution (0.08g of NaOH is weighed into a small beaker, and 5ml of CH3OH is added to completely dissolve it) is added dropwise using a dropper. After the addition is completed, the stirring is accelerated, and when the system appears to be a gel, the gel is broken by rapid stirring for half an hour. After the gel is broken, the remaining NaOH-CH3OH solution is added. The water bath temperature is controlled at 35°C, and the reaction is continued for 1-1.5 hours to obtain the polyvinyl alcohol.

[0036] In one embodiment, the styrene-acryl emulsion has a solid content of 47-49%, a viscosity of <2000 cps at 25°C, a particle diameter of 0.1-0.2μm, and a pH of 7-9; the pure acrylic emulsion has a solid content of 50±2%, a viscosity of 100-500 mpa.s at 25°C, and a pH of 7-9.

[0037] The appearance of the styrene acrylic emulsion is milky white aqueous emulsion; the film forming temperature is 23℃, and the glass transition temperature is 28℃.

[0038] The appearance of the pure acrylic emulsion is slightly transparent milky white blue light liquid. The low film forming temperature is 21℃, and the glass transition temperature is 25℃.

[0039] In one embodiment, the solvent is a mixed solvent of alcohol and water, and the volume ratio of water to alcohol is (85-95):(5-15).

[0040] The alcohol is ethanol.

[0041] In one embodiment, the auxiliary agent includes wetting agent, leveling agent, wear-resistant agent and defoaming agent, and the weight ratio of wetting agent, leveling agent, wear-resistant agent and defoaming agent is (0.1-1):(1-3):(5-10):(0.1-1); the wetting agent is one or a combination of two or more of ethanol, propylene glycol or glycerol; the leveling agent is one or a combination of two of acrylic leveling agent and silicone leveling agent; the wear-resistant agent is one or a combination of two or more of PE wax, PP wax or PTFE wax; and the defoaming agent is one or a combination of two of non-silicon defoaming agent and silicone defoaming agent.

[0042] The preparation method of the water-based gloss oil for enhancing the adhesion of printed matter according to any one of the above, comprising the following steps:

[0043] (1) The components are weighed according to the formula, the water-based resin is dissolved in the solvent, and the mixture is uniformly mixed to obtain a mixture;

[0044] (2) The water-based emulsion and auxiliary agent are added to the mixture of step (1) and stirred uniformly to obtain the water-based gloss oil for enhancing the adhesion of printed matter.

[0045] In one embodiment, the specific process of step (1) is as follows: after the components are weighed according to the formula, the solvent is heated to 70-80℃, then the water-based resin is added, and stirred at a speed of 300-500 r / min for 10-20 min, heated to 85-90℃ and kept for 20-40 min to obtain the mixture; the specific process of step (2) is as follows: after the mixture of step (1) is cooled to 40-50℃, the water-based emulsion is added, and stirred at a speed of 500-1000 r / min for 20-30 min, the auxiliary agent is added, and stirred at a speed of 500-1000 r / min for 20-30 min to obtain the water-based gloss oil for enhancing the adhesion of printed matter.

[0046] The water-based gloss oil provided by the application does not need to wait until the previously printed offset printing ink is dry before printing the water-based gloss oil of the application, and the water-based gloss oil of the application can be printed online with the offset printing ink, thereby shortening the entire printing cycle, improving printing efficiency, and reducing cost. In addition, the preparation method of the water-based gloss oil is simple, and the production cycle is short and efficient.

[0047] The following specific examples are illustrative, as it is obvious that the described examples are only a part of the examples and not all the examples.

[0048] Example 1

[0049] A preparation method of the water-based gloss oil for enhancing the adhesion of printed matter, comprising the following steps:

[0050] The raw materials are weighed according to the formula amount in Table 1, the solvent is first put into the reaction kettle and heated to 80℃, then the water-based resin is put in, and stirred at a speed of 500r / min for 15min, heated to 85℃ for 30min, and the mixed material is obtained; the mixed material is cooled to 40℃, the water-based emulsion is put in, and stirred at a speed of 750r / min for 30min, the additives are put in, and stirred at a speed of 500r / min for 20min, and the water-based gloss oil for enhancing the adhesion of printed matter is prepared.

[0051] The water-soluble rosin modified maleic acid resin is prepared by the following preparation method:

[0052] The rosin and water are loaded into the reaction kettle, heated to melt the rosin, the temperature is kept at 160℃, nitrogen is introduced into the reaction kettle, the decolorizing agent is added, the temperature is raised to 280℃ and kept constant for 5h; the temperature is kept at 170℃, fumaric acid is added to the reaction kettle, the temperature is raised to 240℃ and reacted for 4h; pentaerythritol is added to the reaction kettle, and reacted at 220℃ for 35h to obtain the water-soluble rosin modified maleic acid resin; wherein the mass ratio of rosin: water: decolorizing agent: fumaric acid: pentaerythritol is 100:1:0.55:20:15.

[0053] Example 2

[0054] A preparation method of the water-based gloss oil for enhancing the adhesion of printed matter, comprising the following steps:

[0055] The raw materials are weighed according to the formula amount in Table 1, the solvent is first put into the reaction kettle and heated to 70℃, then the water-based resin is put in, and stirred at a speed of 400r / min for 20min, heated to 87.5℃ for 20min, and the mixed material is obtained; the mixed material is cooled to 50℃, the water-based emulsion is put in, and stirred at a speed of 500r / min for 20min, the additives are put in, and stirred at a speed of 750r / min for 22.5min, and the water-based gloss oil for enhancing the adhesion of printed matter is prepared.

[0056] The water-soluble rosin modified maleic acid resin is prepared by the following preparation method:

[0057] The rosin and water are loaded into a reaction kettle, heated until the rosin is melted, the temperature is kept at 170 DEG C, nitrogen is introduced into the reaction kettle, a decolorizing agent is added, the temperature is raised to 270 DEG C and kept constant for 6 h; the temperature is kept at 175 DEG C, fumaric acid is added into the reaction kettle, the temperature is raised to 220 DEG C and reacted for 5 h; pentaerythritol is added into the reaction kettle, reacted at 240 DEG C for 30 h, to obtain the water-soluble rosin modified maleic acid resin; wherein the mass ratio of rosin: water: decolorizing agent: fumaric acid: pentaerythritol is 100:3:0.1:15:5.

[0058] Example 3

[0059] A preparation method of a water-based gloss oil for enhancing the adhesion of printed matter, comprising the following steps:

[0060] The raw materials are weighed according to the formulation amount in Table 1, the solvent is first put into a reaction kettle and heated to 75 DEG C, then the water-based resin is put in, stirred at a speed of 300 r / min for 10 min, heated to 90 DEG C and kept for 40 min, to obtain a mixture; the mixture is cooled to 45 DEG C, the water-based emulsion is put in, and stirred at a speed of 1000 r / min for 25 min, the additives are put in, and stirred at a speed of 1000 r / min for 30 min, to obtain the water-based gloss oil for enhancing the adhesion of printed matter.

[0061] The water-soluble rosin modified maleic acid resin is prepared by the following preparation method:

[0062] The rosin and water are loaded into a reaction kettle, heated until the rosin is melted, the temperature is kept at 165 DEG C, nitrogen is introduced into the reaction kettle, a decolorizing agent is added, the temperature is raised to 275 DEG C and kept constant for 4 h; the temperature is kept at 180 DEG C, fumaric acid is added into the reaction kettle, the temperature is raised to 200 DEG C and reacted for 6 h; pentaerythritol is added into the reaction kettle, reacted at 200 DEG C for 40 h, to obtain the water-soluble rosin modified maleic acid resin; wherein the mass ratio of rosin: water: decolorizing agent: fumaric acid: pentaerythritol is 100:5:1:10:10.

[0063] Example 4

[0064] A preparation method of a water-based gloss oil for enhancing the adhesion of printed matter, comprising the following steps:

[0065] The raw materials were weighed according to the formulation amount in Table 1, the solvent was first put into the reaction kettle and heated to 72℃, then the water-based resin was put in, and stirred at a speed of 450r / min for 20min, heated to 87.5℃ for 30min, and the mixed material was obtained; the mixed material was cooled to 50℃, then the water-based emulsion was put in, and stirred at a speed of 500r / min for 25min, the auxiliary agent was put in, and stirred at a speed of 750r / min for 27min, and the water-based gloss oil for enhancing the adhesion of printed matter was prepared.

[0066] Example 5

[0067] A preparation method of a water-based gloss oil for enhancing the adhesion of printed matter, comprising the following steps:

[0068] The raw materials were weighed according to the formulation amount in Table 1, the solvent was first put into the reaction kettle and heated to 72℃, then the water-based resin was put in, and stirred at a speed of 450r / min for 20min, heated to 87.5℃ for 30min, and the mixed material was obtained; the mixed material was cooled to 50℃, then the water-based emulsion was put in, and stirred at a speed of 500r / min for 25min, the auxiliary agent was put in, and stirred at a speed of 750r / min for 27min, and the water-based gloss oil for enhancing the adhesion of printed matter was prepared.

[0069] Comparative Examples 1-6

[0070] A preparation method of a water-based gloss oil, comprising the following steps:

[0071] The raw materials were weighed according to the formulation amount in Table 1, the water-soluble rosin modified maleic acid resin of Comparative Examples 1-3 was the water-soluble rosin modified maleic acid resin prepared in Examples 1-3; the solvent was first put into the reaction kettle and heated to 80℃, then the water-based resin was put in, and stirred at a speed of 400r / min for 20min, heated to 87.5℃ for 30min, and the mixed material was obtained; the mixed material was cooled to 50℃, then the water-based emulsion was put in, and stirred at a speed of 1000r / min for 20min, the auxiliary agent was put in, and stirred at a speed of 750r / min for 30min, and the water-based gloss oil was prepared.

[0072] The materials used in the examples and comparative examples are as follows:

[0073] The water-soluble rosin modified maleic acid resin of Examples 4-5 and Comparative Examples 4-5 was DAS6-A-2175, purchased from Beijing Haidata Technology Co., Ltd.

[0074] Polyvinyl alcohol: PVA088-50(2488) was purchased from Inner Mongolia Shuangxin Environmental Protection Material Co., Ltd.

[0075] Styrene-acrylonitrile emulsion: TH8163 was purchased from Xiamen Kandilon Trading Co., Ltd.

[0076] Pure acrylic emulsion: WB-300 is purchased from Nanchang Huate Chemical Co., Ltd.

[0077] Water-soluble acrylic resin: Hanhua Soluryl-20 is purchased from Can Sen Chemical New Material (Shenzhen) Co., Ltd.

[0078] Wetting agent: propylene glycol is purchased from Guangzhou Xinda Trade Co., Ltd.

[0079] Leveling agent: BYK-358N acrylate leveling agent is purchased from Foshan Chancheng Meixinqi Trading Co., Ltd.

[0080] Defoaming agent: THIX-278 silicone defoaming agent is purchased from Yantai Hengxin Chemical Technology Co., Ltd.

[0081] Table 1

[0082]

[0083]

[0084] Results and analysis

[0085] The properties of the water-based varnish described in Examples 1-5 and Comparative Examples 1-6 are tested, and commercially available T-6701 water-based varnish from Taihe Liwax New Material Technology Co., Ltd. is used as a control group; the test standards are as follows:

[0086] Appearance: visual inspection; coating-4 cup viscosity: determined according to GB / T 1723-1993; film gloss: determined according to GB / T 9754-2007 with an incident angle of 60°; abrasion resistance: determined according to GB / T 7705-2008; adhesion level: determined according to GB / T 9286-1998, and the results are shown in Table 2.

[0087] Table 2

[0088]

[0089] Note: The adhesion evaluation criteria in Table 2 have 6 levels, 0-5, with 0 being the best and 5 being the worst. As can be seen from the results in Table 2, the water-based varnish prepared in Examples 1-5 has similar appearance, coating-4 cup viscosity, film gloss, and abrasion resistance to commercially available water-based varnish, but the adhesion of the water-based varnish prepared in Examples 1-5 is greatly improved, which can prevent the surface of paper printed matter from being damaged after the adhesion test.

[0090] Compared with Example 1 and Comparative Example 1, when the water-based emulsion is not in the set range, the adhesion grade of the printed product is reduced by 2 levels, and the surface has a damage phenomenon; and it can be seen from Example 1 and Comparative Examples 2-4 that when the water-soluble rosin modified maleic acid resin and polyvinyl alcohol are used alone or one of them is compounded with a water-soluble acrylic resin, the adhesion grade of the printed product is reduced by 1-3 levels, and the surface has a damage phenomenon; and it can be seen from Example 1 and Comparative Examples 5 and 6 that when the styrene-acryl emulsion and the pure acrylic emulsion are used alone or one of them is compounded with a silicone-acryl emulsion, the adhesion grade of the printed product is also reduced by 3 levels, and the surface has a damage phenomenon.

[0091] In summary, when the water-soluble rosin modified maleic acid resin is compounded with polyvinyl alcohol, the adhesion is excellent, and it is suitable as a water-based gloss oil for preventing the printed product from being damaged after the adhesion test; when the water-soluble rosin modified maleic acid resin and polyvinyl alcohol are used alone or one of them is compounded with a water-soluble acrylic resin, the printed product has a damage phenomenon after the adhesion test; when the styrene-acryl emulsion and the pure acrylic emulsion are compounded, the adhesion is excellent, and it is suitable as a water-based gloss oil for preventing the printed product from being damaged after the adhesion test; when the styrene-acryl emulsion and the pure acrylic emulsion are used alone or one of them is compounded with a silicone-acryl emulsion, the printed product has a damage phenomenon after the adhesion test; when the components of the water-based gloss oil are not in the set range, the printed product has a damage phenomenon after the adhesion test.

[0092] By printing the conventional offset ink first and then printing the water-based gloss oil of the present application by the offset printing machine, the offset ink and the water-based gloss oil have good affinity, so that the printed product has strong adhesion and is sufficient to ensure that the surface of the paper printed product after glossing has no damage after the adhesion test; and the water-based gloss oil of the present application does not need to wait for the offset ink to dry before printing the water-based gloss oil, and the printing efficiency is high.

[0093] The above is only an embodiment of the present application, and does not limit the patent scope of the present application, and any equivalent structure or equivalent process transformation using the content of the present application specification, or direct or indirect application in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A water-based varnish for enhancing the adhesion of printed materials, characterized in that, It comprises the following components by weight: 20-30 parts of waterborne resin, 40-50 parts of waterborne emulsion, 25-35 parts of solvent, and 5-15 parts of additives; wherein the waterborne resin is a mixture of water-soluble rosin-modified maleic acid resin and polyvinyl alcohol; and wherein the waterborne emulsion is a mixture of styrene-acrylic emulsion and pure acrylic emulsion. The weight ratio of the water-soluble rosin-modified maleic acid resin to polyvinyl alcohol is 3:(0.5~1); the weight ratio of styrene-acrylic emulsion to pure acrylic emulsion is 5:(1~2). The water-soluble rosin-modified maleic acid resin has an acid value of 155~175 mgKOH / g and a pH value of 8~9.

2. The water-based varnish for enhancing the adhesion of printed materials according to claim 1, characterized in that, The water-soluble rosin-modified maleic acid resin is prepared by a method comprising the following steps: Rosin and water are mixed and heated until the rosin melts. Nitrogen gas is introduced, and a decolorizing agent is added to react. After the reaction, fumaric acid is added to react, followed by pentaerythritol to react. Once the reaction is complete, the water-soluble rosin-modified maleic acid resin is obtained.

3. The water-based varnish for enhancing the adhesion of printed materials according to claim 2, characterized in that, The mass ratio of rosin:water:decolorizing agent:fumaric acid:pentaerythritol is 100:(1~5):(0.1~1):(10~20):(5~15); the temperature when adding the decolorizing agent is 160~170℃, and the reaction conditions for adding the decolorizing agent are: reaction at 270~280℃ for 4~6h; the temperature when adding fumaric acid is 170~180℃, and the reaction conditions for adding fumaric acid are: reaction at 200~240℃ for 4~6h; the reaction conditions for adding pentaerythritol are: reaction at 200~240℃ for 30~40h.

4. The water-based varnish for enhancing the adhesion of printed materials according to claim 1, characterized in that, The polyvinyl alcohol has a viscosity of 43-65 cps, a pH of 5-7, and a solubility of 86-90.

5. The water-based varnish for enhancing the adhesion of printed materials according to claim 1, characterized in that, The styrene-acrylic emulsion has a solid content of 47-49%, a viscosity of <2000 cps at 25°C, a particle diameter of 0.1-0.2 μm, and a pH value of 7-9; the pure acrylic emulsion has a solid content of 50±2%, a viscosity of 100-500 mpa.s, and a pH value of 7-9 at 25°C.

6. The water-based varnish for enhancing the adhesion of printed materials according to claim 1, characterized in that, The solvent is a mixture of alcohol and water, and the volume ratio of water to alcohol is (85~95):(5~15).

7. The water-based varnish for enhancing the adhesion of printed materials according to claim 1, characterized in that, The additives include a wetting agent, a leveling agent, an abrasion resistant agent, and a defoamer, wherein the weight ratio of the wetting agent, leveling agent, abrasion resistant agent, and defoamer is (0.1~1):(1~3):(5~10):(0.1~1); the wetting agent is one or a combination of two or more of ethanol, propylene glycol, or glycerin; the leveling agent is one or a combination of two of acrylic leveling agents and silicone leveling agents; the abrasion resistant agent is one or a combination of two or more of PE wax, PP wax, or PTFE wax; and the defoamer is one or a combination of two of non-silicone defoamers and silicone defoamers.

8. A method for preparing a water-based varnish for enhancing the adhesion of printed matter according to any one of claims 1 to 7, characterized in that, Includes the following steps: (1) Weigh each component according to the formula amount, dissolve the water-based resin in the solvent, mix evenly, and obtain the mixture; (2) Add water-based emulsion and additives to the mixture in step (1), stir evenly, and obtain the water-based varnish that enhances the adhesion of printed matter.

9. The method for preparing a water-based varnish for enhancing the adhesion of printed materials according to claim 8, characterized in that, The specific process of step (1) is as follows: weigh each component according to the formula, heat the solvent to 70~80℃, then add the water-based resin, stir at 300~500r / min for 10~20min, heat to 85~90℃ and keep warm for 20~40min to obtain the mixture; The specific process of step (2) is as follows: after cooling the mixture of step (1) to 40~50℃, add it to the water-based emulsion and stir at a speed of 500~1000r / min for 20~30min. Add the additives and stir at a speed of 500~1000r / min for 20~30min to obtain the water-based varnish that enhances the adhesion of printed materials.

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