Water-based paint for special PP (polypropylene) synthetic photographic paper for dye ink and capable of increasing film fastness of thermal laminating film and preparation method of water-based paint

Abstract

The invention relates to the technical field of photographic paper coatings, in particular to a PP synthetic photographic paper water-based paint special for dye ink and capable of increasing the film fastness of a thermal laminating film and a preparation method of the PP synthetic photographic paper water-based paint special for the dye ink and capable of increasing the film fastness of the thermal laminating film. The coating is prepared from the following components: 10 to 20 percent of modified silicon dioxide, 25 to 35 percent of polyvinyl alcohol, 8 to 15 percent of polyurethane-acrylic acid hybrid emulsion, 2.5 to 3.5 percent of nano boehmite, 1.5 to 2.5 percent of dispersing agent, 0.5 to 0.7 percent of thickening agent, 0.2 to 0.4 percent of flatting agent, 0.3 to 0.5 percent of defoaming agent, 2 to 4 percent of expanding agent, 0.5 to 1.5 percent of accelerant, 0.1 to 0.3 percent of mildew preventive, 0.1 to 0.3 percent of ammonia water and the balance of deionized water. The water-based paint prepared by the invention has good absorptivity on ink, the film covering fastness is strong after the hot laminating film is covered, and the ink adaptability is high.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of photographic paper coating, in particular to a dye ink special PP synthetic photographic paper water-based coating for increasing the film laminating firmness of thermal laminating film and a preparation method thereof. BACKGROUND

[0002] In the fields of digital images, advertising production, home decoration, etc., PP synthetic photographic paper has gradually replaced traditional photographic paper to become one of the mainstream substrates for dye ink printing, with the advantages of strong weather resistance, high flatness, controllable cost, etc. With the increasing requirements of the market for the decorative effect and storage time of printed products, the application frequency of thermal laminating film lamination process, as a key post-processing step to enhance the surface wear resistance, water resistance and color stability of photographic paper, continues to increase. However, the current dye ink special PP synthetic photographic paper has many problems in actual use, such as insufficient surface coating performance and thermal laminating film adaptability, or migration of part of the additives in the dye ink to the surface of the printed layer after drying, which can greatly reduce the surface tension of the printed layer, resulting in low film laminating firmness, easy edge warping and local peeling after lamination, etc. In addition, the insufficient ink absorption of some coatings also seriously affects the service life and visual presentation effect of the printed product, which has become a core bottleneck restricting the application of PP synthetic photographic paper in the mid-to-high-end printing field.

[0003] Patent CN104629608B discloses a coating liquid for preparing an inkjet high-light waterproof photographic paper, which comprises: ink powder adsorbent 10-40 parts by weight, adhesive 30-55 parts by weight, whitening agent 0.05-0.15 parts by weight, dispersing agent 0.05-0.15 parts by weight, defoaming agent 2-5 parts by weight, neutralizing agent 1-3 parts by weight, and distilled water 140-200 parts by weight; the adhesive is a cationic water-based polyurethane emulsion. The photographic paper prepared by using the coating liquid and the preparation method thereof are also disclosed. The coating liquid is non-toxic and odorless, has good adhesion and waterproofness, and the coating layer has good weather resistance and can withstand sunlight for a long time; the internal structure of the coating layer has high strength and good adhesion to the substrate, and the printed surface of the coating layer has good scratch resistance; the photographic paper prepared by the present application has a particularly fast drying speed after ink absorption, and the output image has clear and sharp picture, bright color, high color reproduction, and no ink stacking phenomenon; and the waterproof effect is good.

[0004] Patent CN115820017A discloses a kind of water-based high light coating for photo paper and preparation method, coating is made of the following mass percentage components: methyl methacrylate 35-45%, isocyanate 10-15%, water-based polyamide resin 11-18%, sodium dodecyl benzene sulfonate 3-8%, diacetone 3-8%, fumed silica 3-5%, wetting agent 1-3%, defoaming agent 0.1-2%, ammonia 1-5% and the balance of deionized water.Preparation method steps include crosslinking, ammoniation, filling, mixing evenly.The coating photo paper manufactured by the invention can achieve the gloss of laminated photo paper, and the water resistance and ink absorption are better than those of the laminated product on the market, which can be completely replaced.The water-based coating for dye ink special PP synthetic photo paper of the application has the advantages of high gloss compared with other coating products.The surface of the obtained coating photo paper is bright, and the pattern is bright and clear.Moreover, the coating material can be completely degraded in soil, without any toxic and harmful substances, and the environmental protection is better.

[0005] Although the coating of the above patent improves the ink absorption, the film adhesion of the hot mounting film is not improved accordingly, therefore, there is an urgent need for a water-based coating for dye ink special PP synthetic photo paper that can increase the film adhesion of the hot mounting film. SUMMARY

[0006] In view of the problems in the prior art, the purpose of the present application is to obtain a water-based coating that can not only increase the film adhesion of the hot mounting film, but also has good ink absorption.

[0007] To achieve the above-mentioned purpose, the technical solution adopted by the present application is as follows: The present application provides a water-based coating for dye ink special PP synthetic photo paper that can increase the film adhesion of the hot mounting film, which contains the following components in 100% by mass: modified silica 10-20%, polyvinyl alcohol 25-35%, polyurethane-acrylic hybrid emulsion 8-15%, nano boehmite 2.5-3.5%, dispersing agent 1.5-2.5%, thickening agent 0.5-0.7%, leveling agent 0.2-0.4%, defoaming agent 0.3-0.5%, expanding agent 2-4%, accelerator 0.5-1.5%, mildew-proof agent 0.1-0.3%, ammonia 0.1-0.3%, and the balance is deionized water.

[0008] In some embodiments, the preparation method of the modified silica includes the following steps: The silica and silane coupling agent are added to the methanol solution, stirred at room temperature for 40-50 min, then 1-amino-5-hexene-2-ol is added, the pH is adjusted to 10-12, and the reaction is carried out at 60-70℃ for 8-9h to obtain modified silica.

[0009] In some embodiments, the particle size of the silica is 5-12μm.

[0010] Preferably, the silane coupling agent is γ-glycidoxypropyltrimethoxysilane.

[0011] In some embodiments, the mass ratio of the silica to 1-amino-5-hexen-2-ol is 1: (0.08-0.15).

[0012] The addition of silica in the coating can enhance the ink absorption of the coating layer and the firmness of the film, but at the same time, due to the poor dispersibility of silica, secondary particles are easily formed, leading to uneven coating, affecting the printing quality and the final film effect. First, the silica with a suitable particle size is modified by silane in the present application, which increases the compatibility of silica with other raw materials in the system, and at the same time, avoids the problems of weak adsorption of small particle size to the additives in the dye ink, affecting the printing effect, and large particle size leading to rough printing patterns and easy peeling and cracking. Secondly, 1-amino-5-hexen-2-ol and silane coupling agent are further reacted to graft double bonds and hydroxyl groups on the surface of silica, which can be uniformly dispersed in deionized water, and can further react with polyurethane-acrylic hybrid emulsion to increase the crosslinking degree of the system, improve the film forming effect of the coating, and improve the printing quality.

[0013] In some embodiments, the preparation method of the polyurethane-acrylic hybrid emulsion comprises the following steps: (1) adding pentaerythritol triacrylate, N-vinylimidazole and initiator into methanol, and reacting at 65-75℃ for 1-2h, filtering, washing, and drying to obtain a polymer; (2) adding polyether polyol, polyisocyanate, chain extender and catalyst into a reaction container, and reacting at 75-85℃ for 4-6h to obtain a prepolymer, then cooling to 55-65℃, adding the polymer obtained in step (1), continuing to cool to 35-45℃, adding a neutralizing agent, and reacting for 5-15min, then adding deionized water and stirring, and then adding initiator, emulsifier and acrylic acid, and reacting at 65-75℃ for 2-3h to obtain a polyurethane-acrylic hybrid emulsion.

[0014] The present application forms a polymer with branched structure by the reaction of pentaerythritol triacrylate and N-vinylimidazole, and adds it into the preparation process of polyurethane to obtain a new type of water-based polyurethane-acrylic hybrid emulsion which can not only improve the film adhesion but also has high adhesion to PP base paper, and has excellent ink adaptability, and the possible reason is that the imidazole ring grafted on the polymer chain has strong polarity and reactivity, which can form strong hydrogen bond and coordination bond with the polar groups in the adhesive used for hot mounting film, and is more easily penetrated and anchored in the adhesive layer of the hot mounting film, and forms a micro interpenetrating network under hot pressing conditions, realizes the mechanical interlocking of "hook-anchor" type, and improves the film adhesion; meanwhile, the branched structure provides more contact points and entanglement possibilities, and can form effective combination with the oxygen-containing polar groups generated on the PP surface after corona treatment, further strengthens the adhesion of the coating to the PP base material, and prevents falling off; in addition, a large number of hydrophilic groups exist in the dense crosslinked network, which can quickly absorb the water in the dye ink, prevent ink drop from spreading, and improve the printing precision, and the dense coating provides a stable fixation platform for the dye ink, further avoids that the surfactants, lubricants and other additives in the dye ink will migrate to the surface of the ink film after drying and film forming, forms a physical isolation layer or lubricating layer, and causes the film adhesion of the hot mounting film to be reduced.

[0015] In some embodiments, the chain extender is a mixture of 1,4-butanediol and dimethylol propionic acid, and the mass ratio of the two is (0.6-0.9):1.

[0016] In some embodiments, the mass ratio of the pentaerythritol triacrylate and N-vinylimidazole is 1:(0.16-0.3).

[0017] In some embodiments, the mass ratio of the polyether polyol and the polymer in step (2) is 1:(0.07-0.13).

[0018] In some embodiments, the particle size of the nanoboeckite is 5-15 nm.

[0019] In some embodiments, the alcoholysis degree of the polyvinyl alcohol is 87-89 mol%.

[0020] The second aspect of the present application provides a preparation method of a water-based coating for a special PP synthetic paper for dye ink to improve the film adhesion of hot mounting film, which comprises the following steps: The polyvinyl alcohol is added into part of the deionized water, heated to 40-50℃ and stirred for 30-60 min, then the remaining deionized water, modified silica, polyurethane-acrylic hybrid emulsion are added and stirred at 60-70℃ for 1-2h, finally the nanoboeckite, dispersant, thickener, leveling agent, defoaming agent, expanding agent, accelerator, mildew inhibitor, ammonia are added and stirred at room temperature for 1-2h to obtain the water-based coating.

[0021] Compared with the prior art, the present application has the following beneficial effects: (1) The present application prepares a water-based paint for a dye ink special PP synthetic paper for high-temperature laminating film lamination fastness by modifying silica, polyurethane-acrylic hybrid emulsion and other additives.

[0022] (2) The present application modifies silica with a suitable particle size, which not only increases the compatibility of silica with other raw materials in the system, but also avoids the problems of weak adsorbability of additives in dye ink, affecting the printing effect, and the problems of not delicate and easy to fall off and crack caused by too large particle size; secondly, 1-amino-5-hexene-2-ol and silane coupling agent are further reacted to graft double bonds and hydroxyl groups on the surface of silica, so that they can be uniformly dispersed in deionized water, and further react with polyurethane-acrylic hybrid emulsion to increase the crosslinking degree of the system, improve the film forming effect of the paint and improve the printing quality.

[0023] (3) The present application forms a branched polymer by the reaction of pentaerythritol triacrylate and N-vinylimidazole, and adds it to the preparation process of polyurethane to obtain a new type of water-based polyurethane-acrylic hybrid emulsion, which not only improves the film lamination fastness, but also has high adhesion to the PP base paper, and has excellent ink adaptability. DETAILED DESCRIPTION

[0024] The present application will be described below in conjunction with specific embodiments. It should be noted that the following examples are examples of the present application and are only used to illustrate the present application, but not to limit the present application. Other combinations and various modifications within the concept of the present application can be made without departing from the spirit or scope of the present application.

[0025] In the following examples and comparative examples, the compounds and related reagents used are commercially available, wherein the silica with an average particle size of 10 μm is purchased from Qinghe County Ruijiang Metal Material Co., Ltd.; the silica with an average particle size of 3 μm is purchased from Donghai County Fucai Mineral Products Co., Ltd.; the polyether diol has a model number of DL-2000D; the thickening agent is ASE-60, the brand is Rohm & Haas; the leveling agent is BYK-349, the defoaming agent is BYK-024, and the brands are both BYK; the expanding agent is Acronal® PLUS8590, the brand is BASF; the mildew-proof agent is Acticide® MBS5050, the brand is British Thor; and the average particle size of the nanometer boehmite is 10 nm.

[0026] Preparation Example 1 The preparation method of modified silica-1 comprises the following steps: Modified Silica-1 was prepared by adding 10 g of silica (average particle size of 10 μm) and 2 g of γ-glycidoxypropyltrimethoxysilane to 100 ml of a 95 wt% methanol solution, stirring at room temperature for 45 min, then adding 1 g of 1-amino-5-hexen-2-ol, adjusting the pH to 11 with sodium hydroxide, and reacting at 65°C for 8.5 h.

[0027] Preparation Example 2 Modified Silica-2 was prepared by the same method as in Preparation Example 1, except that the amount of 1-amino-5-hexen-2-ol added was 2 g.

[0028] Preparation Example 3 Modified Silica-3 was prepared by the same method as in Preparation Example 1, except that the particle size of the silica was 3 μm.

[0029] Preparation Example 4 The preparation method of Polyurethane-Acrylic Hybrid Emulsion-1 comprises the following steps: (1) 10 g of pentaerythritol triacrylate, 2.4 g of N-vinylimidazole, and 0.12 g of azobisisobutyronitrile were added to 100 ml of anhydrous methanol, and reacted at 70°C for 1.5 h, filtered, washed, and dried to obtain a polymer; (2) 100 g of a polyether diol, 60 g of hexamethylene diisocyanate, 2.4 g of 1,4-butanediol, 3 g of dimethylolpropionic acid, and 0.1 g of dibutyltin dilaurate were added to a reaction vessel, and reacted at 80°C for 5 h to obtain a prepolymer, after which the temperature was lowered to 60°C, 10 g of the polymer obtained in step (1) was added, the temperature was further lowered to 40°C, 2.1 g of triethylamine was added, and reacted for 10 min, deionized water was added, and stirred at 1500 rpm for 30 min, after which 1.6 g of azobisisobutyronitrile, 1.5 g of sodium dodecyl sulfate, and 40 g of acrylic acid were added, and reacted at 70°C for 2.5 h to obtain Polyurethane-Acrylic Hybrid Emulsion-1.

[0030] Preparation Example 5 The preparation method of Polyurethane-Acrylic Hybrid Emulsion-2 was the same as in Preparation Example 4, except that the amount of N-vinylimidazole added was 3.5 g.

[0031] Preparation Example 6 The preparation method of Polyurethane-Acrylic Hybrid Emulsion-3 was the same as in Preparation Example 4, except that the amount of polymer added was 16 g.

[0032] Preparation Example 7 The preparation method of Polyurethane-Acrylic Hybrid Emulsion-4 was the same as in Preparation Example 4, except that the pentaerythritol triacrylate was replaced with an equal amount of methyl methacrylate.

[0033] Preparation Example 7 The preparation method of the polyurethane-acrylic hybrid emulsion-5 comprises the following steps: 100 g of polyether diol, 60 g of hexamethylene diisocyanate, 2.4 g of 1,4-butanediol, 3 g of dimethylol propionic acid, 0.1 g of dibutyltin dilaurate were added into a reaction vessel, and reacted at 80℃ for 5 h to obtain a prepolymer, then cooled to 60℃, 10 g of pentaerythritol triacrylate was added, and then cooled to 40℃, 2.1 g of triethylamine was added, reacted for 10 min, deionized water was added, stirred at 1500 rpm for 30 min, then 1.6 g of azobisisobutyronitrile, 1.5 g of sodium dodecyl sulfate, 40 g of acrylic acid were added, and reacted at 70℃ for 2.5 h to obtain the polyurethane-acrylic hybrid emulsion-5.

[0034] Example 1 An aqueous coating for a dye ink special PP synthetic photo paper with high thermal mount film coating fastness, 100% by mass, comprises the following components: modified silica-1 15%, PVA1788 27%, polyurethane-acrylic hybrid emulsion-1 10%, nanometer boehmite 3%, PEG-1000 2%, thickener 0.6%, leveling agent 0.3%, defoaming agent 0.4%, expanding agent 3%, N-methyl diethanolamine 1%, mildewcide 0.2%, 25wt% ammonia 0.2%, and the balance is deionized water.

[0035] The preparation method of the aqueous coating for a dye ink special PP synthetic photo paper with high thermal mount film coating fastness in the embodiment comprises the following steps: PVA1788 was added to half of the mass of deionized water, heated to 45℃ and stirred for 45 min, then the remaining deionized water, modified silica-1, polyurethane-acrylic hybrid emulsion-1 were added and stirred at 65℃ for 1.5 h, finally nanometer boehmite, PEG-1000, thickener, leveling agent, defoaming agent, expanding agent, N-methyl diethanolamine, mildewcide, 25wt% ammonia were added and stirred at room temperature for 1.5 h to obtain the aqueous coating.

[0036] Example 2 An aqueous coating for a dye ink special PP synthetic photo paper with high thermal mount film coating fastness, 100% by mass, comprises the following components: modified silica-1 10%, PVA1788 25%, polyurethane-acrylic hybrid emulsion-18%, nanometer boehmite 2.5%, PEG-1000 1.5%, thickener 0.5%, leveling agent 0.2%, defoaming agent 0.3%, expanding agent 2%, N-methyl diethanolamine 0.5%, mildewcide 0.1%, 25wt% ammonia 0.1%, and the balance is deionized water.

[0037] The preparation method of the water-based paint of the dye ink special PP synthetic paper for increasing the film adhesion of the hot mounting film, comprises the following steps: PVA1788 is added to half of the mass fraction of deionized water, heated to 40℃ and stirred for 60min, then the remaining deionized water, modified silica-1, polyurethane-acrylic hybrid emulsion-1 are added and stirred at 60℃ for 2h, finally nano-boehmite, PEG-1000, thickener, leveling agent, defoaming agent, expanding agent, N-methyl diethanolamine, mildewcide, 25wt% ammonia water are added and stirred at room temperature for 1h to obtain the water-based paint.

[0038] Example 3 A water-based paint of dye ink special PP synthetic paper for increasing the film adhesion of the hot mounting film, comprising the following components in 100% by mass: modified silica-1 20%, PVA1788 35%, polyurethane-acrylic hybrid emulsion-1 15%, nano-boehmite 3.5%, PEG-1000 2.5%, thickener 0.7%, leveling agent 0.4%, defoaming agent 0.5%, expanding agent 4%, N-methyl diethanolamine 1.5%, mildewcide 0.3%, 25wt% ammonia water 0.3%, and the balance is deionized water.

[0039] The preparation method of the water-based paint of the dye ink special PP synthetic paper for increasing the film adhesion of the hot mounting film, comprises the following steps: PVA1788 is added to half of the mass fraction of deionized water, heated to 50℃ and stirred for 30min, then the remaining deionized water, modified silica-1, polyurethane-acrylic hybrid emulsion-1 are added and stirred at 70℃ for 1h, finally nano-boehmite, PEG-1000, thickener, leveling agent, defoaming agent, expanding agent, N-methyl diethanolamine, mildewcide, 25wt% ammonia water are added and stirred at room temperature for 2h to obtain the water-based paint.

[0040] Example 4 A water-based paint of dye ink special PP synthetic paper for increasing the film adhesion of the hot mounting film and its preparation method, the specific implementation is the same as example 1, the difference is that the modified silica-1 is replaced by an equal amount of modified silica-2.

[0041] Example 5 A water-based paint of dye ink special PP synthetic paper for increasing the film adhesion of the hot mounting film and its preparation method, the specific implementation is the same as example 1, the difference is that the modified silica-1 is replaced by an equal amount of modified silica-3.

[0042] Example 6 An aqueous coating for dye ink special PP synthetic photo paper for increasing the heat laminating film adhesion and a preparation method thereof, the specific implementation manner is the same as example 1, the difference is that the polyurethane-acrylic hybrid emulsion-1 is replaced by polyurethane-acrylic hybrid emulsion-2 in equal amount.

[0043] Example 7 An aqueous coating for dye ink special PP synthetic photo paper for increasing the heat laminating film adhesion and a preparation method thereof, the specific implementation manner is the same as example 1, the difference is that the polyurethane-acrylic hybrid emulsion-1 is replaced by polyurethane-acrylic hybrid emulsion-3 in equal amount.

[0044] Example 8 An aqueous coating for dye ink special PP synthetic photo paper for increasing the heat laminating film adhesion and a preparation method thereof, the specific implementation manner is the same as example 1, the difference is that the polyurethane-acrylic hybrid emulsion-1 is replaced by polyurethane-acrylic hybrid emulsion-4 in equal amount.

[0045] Example 9 An aqueous coating for dye ink special PP synthetic photo paper for increasing the heat laminating film adhesion and a preparation method thereof, the specific implementation manner is the same as example 1, the difference is that the polyurethane-acrylic hybrid emulsion-1 is replaced by polyurethane-acrylic hybrid emulsion-5 in equal amount.

[0046] Example 10 An aqueous coating for dye ink special PP synthetic photo paper for increasing the heat laminating film adhesion and a preparation method thereof, the specific implementation manner is the same as example 1, the difference is that the preparation method thereof comprises the following steps: PVA1799 is added to half of the mass fraction of deionized water, heated to 95℃ and stirred for 45min, then the remaining deionized water, modified silica-1, polyurethane-acrylic hybrid emulsion-1 are added and stirred at 65℃ for 1.5h, finally nano-boehmite, PEG-1000, thickening agent, leveling agent, defoaming agent, expanding agent, N-methyldiethanolamine, mildewcide, 25wt% ammonia water are added and stirred at room temperature for 1.5h to obtain the aqueous coating.

[0047] Comparative Example 1 An aqueous coating for dye ink special PP synthetic photo paper for increasing the heat laminating film adhesion and a preparation method thereof, the specific implementation manner is the same as example 1, the difference is that the modified silica-1 is replaced by silica with an average particle size of 10μm in equal amount.

[0048] Performance test The aqueous coating for dye ink special PP synthetic photo paper for increasing the heat laminating film adhesion obtained in each of the above examples and comparative examples is tested as follows: 1. Ink absorption and clarity: the surface of untreated PP synthetic photo paper base paper is coated with the water-based paint prepared in the application, the coating amount is 32 g / m 2 , after drying, the treated PP synthetic photo paper is obtained, and the ink absorption is tested according to the description of patent CN107674457B

[0078] section; then observe the black line of 2 pixels with 10-29 times magnifying glass to see if there is ink bleeding and burr phenomenon to test the clarity.

[0049] 2. Film adhesion: the surface of untreated PP synthetic photo paper base paper is coated with the water-based paint prepared in the application, the coating amount is 32 g / m 2 , after drying, the treated PP synthetic photo paper is obtained, then the standard K&N ink is used to print the photo, the photo is subjected to corona treatment, and then the film is laminated by using a laminator, and then rubbed, and the time of film layer surface delamination whitening is observed and recorded.

[0050] The test results are shown in Table 1: Table 1 From the data in Table 1, it can be seen that the water-based paint obtained in examples 1-3 has good ink absorption, high film adhesion and high printing clarity; the comparison between example 4 and example 1 shows that the change of the ratio of 1-amino-5-hexene-2-ol to silicon dioxide may cause the pores of silicon dioxide to be blocked, the absorption of additives in ink is reduced, and the ink absorption, film adhesion and clarity are all decreased; the comparison between example 5 and example 1 shows that the particle size of silicon dioxide is too small, and all the performances are decreased; the comparison between example 1 and example 6 shows that the change of the ratio of pentaerythritol triacrylate to N-vinylimidazole may cause the imidazole ring to be stacked, and the force between the imidazole ring and the ink is too strong, resulting in a decrease in clarity; the comparison between example 7 and example 1 shows that the change of the ratio of polyether polyol to polymer may cause the crosslinking degree to be too large, and the ink is difficult to be absorbed, so the ink absorption, film adhesion and clarity are all decreased; the comparison between example 8 and example 1 shows that the equal replacement of pentaerythritol triacrylate with methyl methacrylate may cause the additives in the ink to be easily migrated to the surface due to the change of crosslinking degree, resulting in a decrease in film adhesion; the comparison between example 9 and example 1 shows that the absence of polymer in the polyurethane-acrylic hybrid emulsion may cause the film adhesion and clarity to be decreased; the comparison between example 10 and example 1 shows that the change of alcoholysis degree of polyvinyl alcohol may cause the ink absorption and film adhesion to be decreased; the comparison between comparative example 1 and example 1 shows that the direct use of silicon dioxide may cause all the performances to be decreased.

[0051] The above embodiments are only for illustrating the technical concept and characteristics of the present application, and the purpose is to enable those skilled in the art to understand the present application and implement it, and cannot limit the protection scope of the present application, and any equivalent changes or modifications made according to the spirit and principle of the present application shall be covered within the protection scope of the present application.

Claims

1. A water-based coating for dye ink special PP synthetic photo paper for increasing the film adhesion of the thermal laminating film, characterized in that, By 100% in mass, comprising the following components: modified silica 10-20%, polyvinyl alcohol 25-35%, polyurethane-acrylic hybrid emulsion 8-15%, nanometer boehmite 2.5-3.5%, dispersant 1.5-2.5%, thickening agent 0.5-0.7%, leveling agent 0.2-0.4%, defoaming agent 0.3-0.5%, expanding agent 2-4%, accelerator 0.5-1.5%, mildewcide 0.1-0.3%, ammonia 0.1-0.3%, the balance is deionized water.

2. The water-based coating of the special PP synthetic paper for dye ink of the heightening heat mount film laminating fastness according to claim 1, characterized in that, The preparation method of the modified silica comprises the following steps: The silica and silane coupling agent are added into a methanol solution, stirred at room temperature for 40-50 min, then 1-amino-5-hexene-2-ol is added, the pH is adjusted to 10-12, and the reaction is carried out at 60-70℃ for 8-9 h to obtain the modified silica.

3. The water-based coating of the special PP synthetic paper for dye ink of the heightening heat mount film laminating fastness according to claim 2, characterized in that, The particle size of the silica is 5-12 μm.

4. The water-based coating of the special PP synthetic paper for dye ink of the heightening heat mount film laminating fastness according to claim 2, characterized in that, The mass ratio of the silica to 1-amino-5-hexene-2-ol is 1: (0.08-0.15).

5. The water-based coating of the special PP synthetic photo paper for dye ink special for heightening the film adhesion of the thermal laminating film according to claim 1, characterized in that, The preparation method of the polyurethane-acrylic hybrid emulsion comprises the following steps: (1) pentaerythritol triacrylate, N-vinylimidazole and initiator are added into methanol, and the reaction is carried out at 65-75℃ for 1-2 h, then the polymer is obtained by filtration, washing and drying; (2) polyether polyol, polyisocyanate, chain extender and catalyst are added into a reaction container, and the reaction is carried out at 75-85℃ for 4-6 h to obtain a prepolymer, then the temperature is lowered to 55-65℃, the polymer obtained in step (1) is added, the temperature is continuously lowered to 35-45℃, a neutralizing agent is added, and the reaction is carried out for 5-15 min, then deionized water is added and stirred, then initiator, emulsifier and acrylic acid are added, and the reaction is carried out at 65-75℃ for 2-3 h to obtain the polyurethane-acrylic hybrid emulsion.

6. The water-based coating of the special PP synthetic photo paper for dye ink special for heightening the film adhesion of the thermal laminating film according to claim 5, characterized in that, The mass ratio of the pentaerythritol triacrylate to N-vinylimidazole is 1: (0.16-0.3).

7. The water-based coating of the special PP synthetic photo paper for dye ink special for heightening the film adhesion of the thermal laminating film according to claim 5, characterized in that, In step (2), the mass ratio of the polyether polyol to the polymer is 1: (0.07-0.13).

8. The water-based coating of the special PP synthetic photo paper for dye ink special for the film adhesion of the heightening thermal laminating film according to claim 1, characterized in that, The particle size of the nanometer boehmite is 5-15 nm.

9. The water-based coating of the special PP synthetic photo paper for dye ink special for heightening the film adhesion of the thermal laminating film according to claim 1, characterized in that, The alcoholysis degree of the polyvinyl alcohol is 87-89 mol%.

10. A method for preparing an aqueous coating for a special PP photographic paper for dye ink speciality of mounting film fastness according to any one of claims 1 to 9, characterized in that, Comprising the following steps: The polyvinyl alcohol is added into part of the deionized water, and the temperature is raised to 40-50℃ and stirred for 30-60 min, then the remaining deionized water, modified silica, polyurethane-acrylic hybrid emulsion are added and stirred at 60-70℃ for 1-2 h, finally the nanometer boehmite, dispersant, thickening agent, leveling agent, defoaming agent, expanding agent, accelerator, mildewcide and ammonia are added and stirred at room temperature for 1-2 h to obtain the water-based paint.

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