Color ink-jet printing paper coating and preparation method thereof

Abstract

The invention discloses a color ink-jet printing paper coating and a preparation method thereof. The coating is prepared from the following components in parts by weight: 50 to 80 parts of gas-phase SiO2 aqueous solution, 20 to 50 parts of zeolite aqueous solution, 30 parts of PVA-1788 aqueous solution, 5 parts of polyamine, 0.6 to 0.7 part of defoaming agent, 0.1 to 0.4 part of rheological agent, 50 parts of deionized water and 0.1 to 0.4 part of dispersing agent. The quasi-preparation method of the coating comprises the following steps: adding a gas-phase SiO2 aqueous solution and a zeolite aqueous solution into deionized water under the condition of room temperature, stirring for 10 minutes under the condition of 1000r / min, then adding a PVA-1788 aqueous solution, continuously stirring for 5 minutes, finally adding polyamine, a defoaming agent and a rheological agent, and uniformly stirring and mixing to obtain the color ink-jet printing paper and the preparation method thereof. According to the invention, the problem of non-uniform coating of a coating machine due to high coating viscosity is improved, and the coating method is suitable for a modern high-speed coating machine. The color ink-jet printing paper prepared through the method is good in ink absorbency, high in color fixing capacity and beneficial to improving the color density.

Description

Technical Field

[0001] The invention relates to a color inkjet printing paper coating, in particular to a color inkjet printing paper coating and a preparation process thereof. Background Art

[0002] As the requirements for modern high-speed coating become higher and higher, higher requirements are also placed on the performance of coatings. At present, the production of coated paper mostly uses scraper or curtain coating technology. In 2019, the curtain coater produced by Voith can reach a width of 5m, an operating speed of up to 1200m / min, and a maximum design speed of 1500m / min. This requires the coating liquid to have good rheological properties and meet the requirements of "high concentration and low viscosity". However, the coatings currently used have high viscosity due to the addition of main pigments such as SiO2, calcium carbonate, and porcelain clay, and are not suitable for use in high-speed coating machines.

[0003] With the continuous development of inkjet technology, higher requirements are placed on the performance of color inkjet printing paper. The new digital inkjet printer launched by Fujifilm in 2019 uses water-based pigment ink and has a printing speed of 3,600 sheets per hour. The currently used consumables, coated paper, have a large pore size. Although the large number of pits and fibers on the coated paper provide excellent ink absorption performance, the pore size on the surface of the paper is mostly greater than 0.5μm. When printing with water-based pigment ink, the ink will quickly penetrate into the pores and reduce the printing density. In order to achieve the set color density, more ink needs to be sprayed, increasing printing costs.

[0004] With the development of digital imaging technology, the demand for color digital printing paper is increasing. Color digital printing paper is a kind of coated processed paper. It is coated and further processed on the basis of ordinary printing paper. The main thing is to coat the surface with coating so that it can quickly absorb ink and prevent it from spreading to the surrounding area, while ensuring the original color and image clarity. Summary of the invention

[0005] The present invention aims to alleviate or even solve at least one of the above mentioned problems to at least some extent.

[0006] In order to solve the above-mentioned technical problems, the present application has selected a technical solution: to provide a color inkjet printing paper coating, the coating coating comprising 80 parts by weight of a gas-phase SiO2 aqueous solution, 20 parts by weight of a zeolite aqueous solution, 5 parts by weight of a polyamine, and 30 parts by weight of a PVA-1788 aqueous solution; and the coating also includes a defoamer and a rheological agent, the defoamer is 0.6-0.7 parts by weight, and the rheological agent is 0.1-0.4 parts by weight.

[0007] Wherein, the coating comprises NaOH, and the NaOH is 0.05-0.2 parts by weight.

[0008] Wherein, the coating comprises a dispersant, a defoamer and a rheological agent, wherein the dispersant is added in an amount of 0.1-0.4 parts by weight, the defoamer is added in an amount of 0.6-0.7 parts by weight, and the rheological agent is added in an amount of 0.1-0.4 parts by weight.

[0009] The coating has a coating solid content of 30% to 35%, a dispersed solid content of the gas-phase SiO2 aqueous solution of 30%, a dispersed solid content of the zeolite aqueous solution of 50%, and a dispersed solid content of the PVA-1788 aqueous solution of 30%.

[0010] Wherein, the coating amount of the coating is 9-11 g / m 2 The gas-phase SiO2 particles in the gas-phase SiO2 aqueous solution are flocculent, the particle size of the gas-phase SiO2 aqueous solution is 7-40 nm, and the specific surface area of ​​the gas-phase SiO2 is 50-380 m 2 / g, the oil absorption value of the gas phase SiO2 is 250-350ml / 100g.

[0011] The particle size of the zeolite aqueous solution is 5 to 7 μm, and the specific surface area of ​​the zeolite is 400 to 800 m 2 / g, and the zeolite particles in the zeolite aqueous solution are spherical.

[0012] The polyamine is a cationic high molecular polymer with a solid content of 40%, a viscosity of 1000-1050cp at room temperature, a pH value of 4-7, and an addition amount of 5 parts by weight.

[0013] Wherein, the substrate is 110g coated paper.

[0014] Different from the prior art, the beneficial effects of this application are:

[0015] The color inkjet printing paper coating of the present invention uses zeolite as the coating pigment, the particle size is 5 to 7 μm, and the specific surface area of ​​the zeolite is 400 to 800 m 2 / g, the zeolite is in the form of spherical particles, its price is lower than that of gas-phase SiO2, and it has good ink absorption and fluidity.

[0016] The present invention uses polyamine as a color fixing agent in the coating, which has a high molecular weight and charge density, can absorb a large amount of anions in the ink, so that the pigment remains on the coating surface, prevents the color-developing components in the ink from being absorbed deep into the coating, and improves the color density of the printed paper.

[0017] The invention improves the coating formula of color-sprayed paper, that is, the coating formula is 50-80 parts by weight of gas-phase SiO2 aqueous solution, 20-50 parts by weight of zeolite aqueous solution, 30 parts by weight of PVA-1788 aqueous solution, 5 parts by weight of polyamine, 0.6-0.7 parts by weight of defoamer, 0.1-0.4 parts by weight of rheological agent, 50 parts by weight of deionized water, and 0.1-0.4 parts by weight of dispersant, wherein the coating comprises NaOH, and the amount of NaOH is 0.05-0.2 parts by weight. The invention has the characteristics of "high concentration and low viscosity" while reducing the coating cost, and is suitable for use by modern high-speed coating machines.

[0018] In order to more clearly explain the technical solutions in the embodiments of the present application, the above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0019] Figure 1 This is a surface electron microscope photo of the inkjet printing paper provided by this application

[0020] Figure 2 This is a schematic diagram of the structure of the inkjet printing paper provided by this application

[0021] Figure 3 It is a schematic flow chart of a method for preparing inkjet printing paper provided in the present application;

[0022] Figure 4 yes Figure 3 A schematic diagram of the process of manufacturing a coating in step S100;

[0023] Figure 5 yes Figure 3 Schematic diagram of the process of preparing SiO2 dispersion in step S120. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical scheme and advantages of the present invention clearer, the technical scheme in the embodiment of the present application is described in detail in conjunction with the embodiment below. It should be understood that the embodiment described herein is only a part of the embodiment of the present application, rather than all the embodiments. Based on the embodiment in the present application, all other embodiments obtained by ordinary technicians in the field without making creative work are within the scope of protection of this application.

[0025] With the development of digital imaging technology, the demand for color inkjet printing paper is increasing. Color inkjet printing paper is a kind of coated paper. It is coated and processed on the basis of ordinary printing paper. It mainly coats the surface with coating so that it can absorb water-based ink and prevent ink droplets from spreading to the surrounding area, thereby completely maintaining the original color and clarity. At present, inkjet printing paper is divided into matte color inkjet printing paper and high-gloss color inkjet printing paper. Among them, matte color inkjet printing paper is mainly used for color printing of office documents, and the application volume is very large. With the increasing requirements of modern high-speed coating, higher requirements are also put forward for the performance of coatings. At present, the production of coated paper mostly uses scraper or curtain coating technology. The curtain coating machine produced by Voith in 2019 can reach a width of 5m, a running speed of 1200m / min, and a maximum design speed of 1500m / min. This requires the coating liquid to have good rheology and meet the requirements of "high concentration and low viscosity". The paints currently used have high viscosity due to the addition of main pigments such as SiO2, calcium carbonate, and porcelain clay, and are not suitable for use in high-speed coating machines.

[0026] As inkjet technology continues to advance, the performance standards of color inkjet printing paper are also improving. In 2019, Fujifilm launched a new digital inkjet printer that uses water-based pigment ink and can print at a speed of up to 3,600 sheets per hour. The currently used consumables, coated paper, have a larger pore size. Although the large number of pits and fibers on the coated paper provide excellent ink absorption performance, the pore size on the surface of the paper is mostly greater than 0.5μm. When printing with water-based pigment ink, the ink will quickly penetrate into the pores, which will reduce the printing density. In order to achieve the set color density, more ink needs to be sprayed, increasing printing costs.

[0027] See also Figure 1 , Figure 1 This is a surface photo of the inkjet printing paper provided by this application. After being coated with gas phase SiO2 and zeolite, the paper surface has a higher porosity and specific surface area, so that the water-based ink carrier is quickly absorbed from the surface into the porous structure. It can effectively increase the ink absorption speed and reduce the degree of ink droplet diffusion. Please refer to Figure 2 , Figure 2 1 is a schematic diagram of the structure of the inkjet printing paper provided by the present application. The present application provides an inkjet printing paper 10, which includes but is not limited to a base paper 12 and a coating 11. In this embodiment, the coating of the coating 11 includes 80 parts by weight of a gas-phase SiO2 aqueous solution, 20 parts by weight of a zeolite aqueous solution, 5 parts by weight of a polyamine, and 30 parts by weight of a PVA-1788 aqueous solution; and the coating also includes a defoamer and a rheological agent, the defoamer is 0.6-0.7 parts by weight, and the rheological agent is 0.1-0.4 parts by weight.

[0028] Optionally, in some embodiments, the vapor-phase SiO2 aqueous solution in the coating of the coating 11 may be 50-80 parts by weight, for example, the vapor-phase SiO2 aqueous solution may be 50 parts by weight, 60 parts by weight, 70 parts by weight, or 80 parts by weight, which is not specifically limited herein.

[0029] Optionally, in some embodiments, the zeolite aqueous solution in the coating of the coating 11 may be 20-50 parts by weight, for example, the zeolite aqueous solution may be 20 parts by weight, 30 parts by weight, 40 parts by weight, or 50 parts by weight, which is not specifically limited herein.

[0030] Optionally, in some embodiments, the PVA-1788 aqueous solution in the coating of the coating 11 may be 20%, 40%, 60%, or 80%; no specific limitation is made herein.

[0031] In the coating formula, the pigments used are gas-phase SiO2 and zeolite with small particle size and high specific surface area. Both pigments are dispersed using sodium polyacrylate dispersant.

[0032] PVA-1788 as an adhesive provides a certain bonding force for coating 11, and the surface of PVA-1788 has a large number of hydroxyl groups, which can easily form a network structure with the hydroxyl groups on the surface of SiO2. When drying, coating 11 can resist external pressure, so that coating 11 has good porosity and ink absorption.

[0033] Compared with the traditional 100% SiO2 dispersed pigment coating formula, the coating formula in the present application reduces the viscosity of the coating, increases the rheological properties of the coating, and gives the coating better fluidity, which can adapt to the operation of high-speed coating machines, while giving the coating 11 better ink absorbency and ink drying speed without changing the solid content of the coating.

[0034] Optionally, in this embodiment, the coating 11 includes NaOH. Specifically, the added amount of NaOH is 0.05-0.2 parts by weight.

[0035] Optionally, in this embodiment, the coating 11 includes a dispersant, a defoamer and a rheological agent. Specifically, the dispersant is added in an amount of 0.1-0.4 parts by weight, the defoamer is added in an amount of 0.6-0.7 parts by weight, and the rheological agent is added in an amount of 0.1-0.4 parts by weight.

[0036] Optionally, in some embodiments, the added amount of the dispersant can be 0.1%, 0.2%, 0.3% or 0.4% of the total mass of the coating 11; the added amount of the rheological agent can be 0.1%, 0.2%, 0.3% or 0.4% of the total mass of the coating 11, which is not specifically limited here.

[0037] Optionally, in this embodiment, the coating solid content of the coating 11 is 30%, 32%, 34%, or 35%; the dispersed solid content of the gas-phase SiO2 aqueous solution is 20%, the dispersed solid content of the zeolite aqueous solution is 50%, and the dispersed solid content of the PVA aqueous solution is 30%, which is not specifically limited here.

[0038] Optionally, in some embodiments, the particles of the gas-phase SiO2 in the gas-phase SiO2 aqueous solution are flocculent, the particle size of the gas-phase SiO2 aqueous solution is 7 to 40 nm, and the specific surface area of ​​the gas-phase SiO2 is 50 to 380 m 2 / g, the oil absorption value of the gas phase SiO2 is 250-350ml / 100g.

[0039] In order to more vividly demonstrate the difference from the ordinary inkjet printing paper 10, three groups of examples and two groups of comparative examples were carried out, as shown in the following figures:

[0040]

[0041] Please refer to Comparative Example 1 and Example 1. Comparative Example 1 is a group of examples made according to the prior art; Example 1 is the first example made according to the coating formula of the present application. The coating in Comparative Example 1 includes 100 parts by weight of gas-phase SiO2 aqueous solution, 30 parts by weight of PVA-1788 aqueous solution, 5 parts by weight of polyamine, wherein 0.1 parts by weight of NaOH, 0.2 parts by weight of dispersant, 0.2 parts by weight of defoamer, and 0.2 parts by weight of rheological agent are also added. The solid content of the coating in Comparative Example 1 is 34.2%.

[0042] The coating in Example 1 includes 50 parts by weight of fumed SiO2 aqueous solution, 50 parts by weight of zeolite aqueous solution, 30 parts by weight of PVA-1788 aqueous solution, 5 parts by weight of polyamine, wherein 0.1 parts by weight of NaOH, 0.2 parts by weight of dispersant, 0.2 parts by weight of defoamer, and 0.2 parts by weight of rheological agent are also added, and the solid content of the coating in Example 1 is 32.4%. From the comparison between Comparative Example 1 and Example 1, it can be seen that the coating formula provided by the present application has a high solid content while maintaining low viscosity.

[0043] Please refer to Comparative Example 2 and Example 2. Comparative Example 2 is the second example made according to the coating formula of the present application; Example 2 is the third example made according to the coating formula of the present application. The coating in Comparative Example 2 includes 100 parts by weight of zeolite aqueous solution, 30 parts by weight of PVA-1788 aqueous solution, and 5 parts by weight of polyamine, wherein 0.1 parts by weight of NaOH, 0.2 parts by weight of dispersant, 0.2 parts by weight of defoamer, and 0.2 parts by weight of rheological agent are also added. The solid content of the coating in Comparative Example 2 is 30.5%.

[0044] The coating in Example 2 includes 70 parts by weight of a vapor-phase SiO2 aqueous solution, 30 parts by weight of a zeolite aqueous solution, 20 parts by weight of a PVA-1788 aqueous solution, and 5 parts by weight of a polyamine, to which 0.1 parts by weight of NaOH, 0.2 parts by weight of a dispersant, 0.2 parts by weight of a defoaming agent, and 0.2 parts by weight of a rheological agent are added. The solid content of the coating in Example 2 is 33.1%.

[0045] Please refer to Example 2 and Example 3. Example 3 is the fourth example made according to the coating formula of the present application. The coating in Example 3 includes 80 parts by weight of gas-phase SiO2 aqueous solution, 20 parts by weight of zeolite aqueous solution, 20 parts by weight of PVA-1788 aqueous solution, 5 parts by weight of polyamine, wherein 0.1 parts by weight of NaOH, 0.2 parts by weight of dispersant, 0.2 parts by weight of defoamer, and 0.2 parts by weight of rheological agent are also added. The solid content of the coating in Example 3 is 34.5%. It can be seen from the comparison between Example 2 and Example 3 that Example 3 has lower viscosity and higher color density.

[0046] In the coating formula, the pigments used are gas-phase SiO2 and zeolite with small particle size and high specific surface area. Both pigments are dispersed using sodium polyacrylate dispersant.

[0047] See also Figure 3 , Figure 3 1 is a flow chart of a method for preparing inkjet printing paper provided in the present application. The method for preparing inkjet printing paper 10 comprises the following steps:

[0048] S100: Prepare the base paper 12 and the coating layer 11 respectively.

[0049] Specifically, the coating has a coating solid content of 30% to 35%.

[0050] S200: Disposing the coating layer 11 on the base paper 12 to obtain the inkjet printing paper 10.

[0051] See also Figure 4 , Figure 4 yes Figure 3 The process diagram of manufacturing the coating in step S100 is shown in FIG. 1 . The method for preparing the coating 11 comprises the following steps:

[0052] S110: Take 80 parts by weight of a vapor-phase SiO2 aqueous solution, and add 20 parts by weight of a zeolite aqueous solution to the vapor-phase SiO2 aqueous solution to prepare a mixed solution.

[0053] Specifically, both the gas-phase SiO2 aqueous solution and the zeolite aqueous solution are dispersed using a sodium polyacrylate dispersant, wherein the dispersed solid content of the gas-phase SiO2 aqueous solution is 30% to 35%, and the dispersed solid content of the zeolite aqueous solution is 50%.

[0054] 5 parts by weight of polyamine were added to the mixed solution, and then 0.05-0.2 parts by weight of NaOH were added.

[0055] The mixed solution was stirred at 1000 rpm for 10 to 20 minutes, and then 30 parts by weight of PVA-1788 aqueous solution, 0.6 to 0.7 parts by weight of defoaming agent, and 0.1 to 0.4 parts by weight of rheological agent were added.

[0056] See also Figure 5 , Figure 5 yes Figure 4 The process diagram of the preparation method of the gas phase SiO2 dispersion liquid in step S120 is shown in FIG. The preparation method of the gas phase SiO2 dispersion liquid comprises the following steps:

[0057] According to the preset dispersed solid content of the gas-phase SiO2 dispersion, the preset addition amounts of the gas-phase SiO2 and distilled water are determined.

[0058] Specifically, in this embodiment, the preset dispersed solid content of the gas-phase SiO2 dispersion is 30% to 35%.

[0059] First add 70% to 80% of the preset amount of distilled water to the dispersion container, then add gas phase SiO2 and 0.05-0.2 parts by weight of NaOH.

[0060] Specifically, NaOH is used to adjust the solution pH to 9-11.

[0061] Slowly add gaseous SiO2 into the dispersion container and gradually increase the rotation speed.

[0062] After the preset amount of gas-phase SiO2 is completely added to the dispersion container, stir at a speed of 1000-1500 rpm for 30 minutes.

[0063] Then reduce the stirring speed to 500 rpm and continue stirring for 30 min.

[0064] Add distilled water to the dispersion container until the current addition amount of distilled water is equal to the preset addition amount, and stir at 1000-1500 rpm for 30 min.

[0065] It should be noted that the current addition amount of distilled water is equal to the preset addition amount, which means that the total amount of distilled water after adding distilled water is equal to the preset addition amount of distilled water. For example, in step S122, 70% of the preset addition amount of distilled water is first added to the dispersion container; then in steps S123 to S126, part of the distilled water evaporates during the stirring process, and the remaining amount of distilled water is 50% of the preset addition amount; finally, in step S127, distilled water is added to the dispersion container so that the existing amount of distilled water is 100% of the preset addition amount.

[0066] In this embodiment, the gas-phase SiO2 dispersion is affected by the high-speed shear of the agitator in the initial stage of dispersion, which destroys the aggregates and floccules of the pigment, causing the average particle size of the dispersion to gradually approach its original particle size, thereby achieving mechanical and physical dispersion of the particles. Subsequently, a dispersant is added to stabilize the dispersion of the gas-phase SiO2 particles through electrostatic action.

[0067] The present application optimizes the coating formula of coating 11, that is, the coating ratio of coating 11 is 80 parts of gas-phase SiO2 aqueous solution, 20 parts by weight of zeolite aqueous solution, 30 parts by weight of PVA-1788 aqueous solution, and 5 parts by weight of polyamine, wherein 0.1 parts by weight of NaOH, 0.2 parts by weight of dispersant, 0.2 parts by weight of defoamer, and 0.2 parts by weight of rheological agent are also added.

[0068] The above descriptions are only some embodiments of the present application, and do not limit the protection scope of the present application. Any equivalent device or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly used in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A color inkjet printing paper coating and a preparation method thereof, characterized in that: The coating comprises 80 parts by weight of a vapor-phase SiO2 aqueous solution, 20 parts by weight of a zeolite aqueous solution, 30 parts by weight of a PVA-1788 aqueous solution, and 5 parts by weight of a polyamine; and the coating also comprises a defoamer and a rheological agent, wherein the defoamer accounts for 0.6-0.7 parts by weight of the total mass of the coating, and the rheological agent accounts for 0.1-0.4 parts by weight of the total mass of the coating.

2. The color inkjet printing paper coating and preparation method thereof according to claim 1, characterized in that: The coating comprises NaOH, the addition amount of the NaOH is 0.05-0.2 parts by weight of the total mass of the coating paint, and the gas-phase SiO2 aqueous solution is a 20% gas-phase SiO2 aqueous solution prepared from flocculent gas-phase SiO2 raw materials.

3. The color inkjet printing paper coating and preparation method thereof according to claim 1, characterized in that: The coating includes a dispersant, a defoamer, and a rheological agent. The added amount of the dispersant accounts for 0.1-0.4 weight parts of the total mass of the coating paint, the added amount of the defoamer accounts for 0.6-0.7 weight parts of the total mass of the coating paint, and the added amount of the rheological agent accounts for 0.1-0.4 weight parts of the total mass of the coating paint.

4. The color inkjet printing paper coating and preparation method thereof according to claim 1, characterized in that: The coating has a coating solid content of 30% to 35%, the dispersed solid content of the gas-phase SiO2 aqueous solution is 30%, the dispersed solid content of the zeolite aqueous solution is 50%, and the dispersed solid content of the PVA-1788 aqueous solution is 30%.

5. The color inkjet printing paper coating and preparation method thereof according to claim 1, characterized in that: The coating amount of the coating is 9 to 11 g / m 2 The gas-phase SiO2 particles in the gas-phase SiO2 aqueous solution are flocculent, the particle size of the gas-phase SiO2 aqueous solution is 7-40 nm, and the specific surface area of ​​the gas-phase SiO2 is 50-380 m 2 / g, the oil absorption value of the gas phase SiO2 is 250-350ml / 100g.

6. The color inkjet printing paper coating and the preparation method thereof according to claim 1, characterized in that: The particle size of the zeolite aqueous solution is 5 to 7 μm, and the specific surface area of ​​the zeolite is 400 to 800 m 2 / g, and the zeolite particles in the zeolite aqueous solution are spherical.

7. A color inkjet printing paper coating and a preparation method thereof, characterized in that: The process steps include: Take 80 parts by weight of a vapor-phase SiO2 aqueous solution, add 20 parts by weight of a zeolite aqueous solution to the vapor-phase SiO2 aqueous solution to prepare a mixed solution; wherein the vapor-phase SiO2 aqueous solution and the zeolite aqueous solution are both dispersed using a sodium polyacrylate dispersant; 30 parts by weight of PVA-1788 aqueous solution, 5 parts by weight of the polyamine, 0.6-0.7 parts by weight of the defoamer, and 0.1-0.4 parts by weight of the rheological agent were added to the mixed solution in sequence.

8. The color inkjet printing paper coating and the preparation method thereof according to claim 7, characterized in that: The steps of preparing the gas phase SiO2 dispersion liquid include: Determining the preset addition amounts of gas-phase SiO2 and distilled water according to the preset dispersed solid content of the gas-phase SiO2 dispersion; First, add 70% to 80% of the preset amount of distilled water into the dispersion container, then add 0.1-0.3 parts by weight of sodium polyacrylate dispersant and gas-phase SiO2, and gradually increase the rotation speed; After the preset amount of the gas phase SiO2 is completely added to the dispersion container, stirring is performed at a speed of 1000-1500 rpm for 30 minutes; Then, the stirring speed is reduced to 500 rpm, and 0.05% to 0.2% of the total mass of the distilled water is added with NaOH; Increase the stirring speed to 1000-1500 rpm and continue stirring for 30 minutes; Add distilled water to the dispersion container until the current addition amount of the distilled water is equal to the preset addition amount, and stir at 1000-1500 rpm for 30 min.

9. The color inkjet printing paper coating and the preparation method thereof according to claim 7, characterized in that: The steps of preparing the zeolite dispersion include: Determining the preset addition amounts of zeolite and distilled water according to the preset dispersed solid content of the zeolite dispersion; First, add 70% to 80% of the preset amount of distilled water into the dispersion container, then add 0.1 to 0.3 parts by weight of sodium polyacrylate dispersant and zeolite, and gradually increase the speed; After the preset amount of zeolite is completely added to the dispersion container, stirring is performed at a speed of 1000-1500 rpm for 30 minutes; Then reduce the stirring speed to 500 rpm and add 0.05-0.2 parts by weight of NaOH; Increase the stirring speed to 1000-1500 rpm and continue stirring for 30 minutes; Add distilled water to the dispersion container until the current addition amount of the distilled water is equal to the preset addition amount, and stir at 1000-1500 rpm for 30 min.

10. The color inkjet printing paper coating and the preparation method thereof according to claim 7, characterized in that: The coating has a coating solid content of 30% to 35%, the dispersed solid content of the gas-phase SiO2 aqueous solution is 30%, the dispersed solid content of the zeolite aqueous solution is 50%, and the dispersed solid content of the PVA-1788 aqueous solution is 30%.

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