Wear-resistant and antibacterial composite playing card paper containing nanometer materials
By forming a transparent composite layer of nanoparticles and polymers on both sides of the playing card paper, the problems of insufficient gloss, easy wear and tear, and adhesion of traditional playing card paper are solved, achieving the effects of wear resistance, antibacterial properties, and convenient card handling.
Patent Information
- Application Number
- CN202511670537.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-11-14
- Publication Date
- 2026-02-27
- Estimated Expiration
- Not applicable · inactive patent
AI Technical Summary
Traditional playing card paper lacks gloss, is easily worn, has poor stain resistance, and tends to stick together during use, making it difficult to meet the needs of drawing and shuffling cards.
A transparent composite layer structure of nanoparticles and polymers is adopted, including SiO2 nanoparticles with hydrophilic modification on the surface, and a wear-resistant and antibacterial coating is formed on both sides of the paper substrate through specific process steps.
The paper has improved abrasion resistance and antibacterial properties, increased friction between the paper surface and the hand, and reduced friction between paper surfaces, making it easier to grab and shuffle the cards.
Abstract
Description
Technical Field
[0001] This disclosure relates to the field of specialty paper processing technology, and in particular to a composite playing card paper containing nanomaterials that is wear-resistant and antibacterial. Background Technology
[0002] Traditional playing card paper often uses single-sided coating or ordinary lamination processes, resulting in insufficient gloss, easy wear and tear, and poor stain resistance. In existing technologies, high-gloss coated paper often improves gloss through a single curing process or ordinary calendering, but this easily leads to poor coating adhesion, low folding endurance, and a lack of antibacterial properties.
[0003] Furthermore, traditional playing card paper has the following drawbacks when playing poker: the surface of traditional playing card paper is made smooth by using matte / gloss oil or water-based varnish; however, after repeated rubbing, the front and back of the playing cards are prone to sticking together, making shuffling and drawing the cards very difficult.
[0004] Therefore, there is an urgent need to develop a composite playing card paper that is both wear-resistant and antibacterial to meet the needs of drawing and shuffling cards. Summary of the Invention
[0005] This disclosure provides a composite playing card paper containing nanomaterials that is wear-resistant and antibacterial, in order to address the shortcomings of related technologies.
[0006] According to a first aspect of the present disclosure, a composite playing card paper comprising nanomaterials for wear resistance and antibacterial properties is provided, the composite playing card paper comprising the following structure:
[0007] A paper substrate layer, a first transparent composite layer of nanoparticles and polymers disposed on the back side of the paper substrate layer, and a second transparent composite layer of nanoparticles and polymers disposed on the front side of the paper substrate layer;
[0008] The first transparent composite layer and the second transparent composite layer of nanoparticles-polymer contain SiO2 nanoparticles with hydrophilic modification on their surface.
[0009] In one aspect of the present disclosure, the surface-modified hydrophilic SiO2 nanoparticles comprise a first SiO2 nanoparticle and a second SiO2 nanoparticle; the D50 value of the first SiO2 nanoparticle is selected from 50-85 μm, and the D50 value of the second SiO2 nanoparticle is selected from 15-35 μm; and the mass ratio of the first SiO2 nanoparticle to the second SiO2 nanoparticle is selected from (3-6):1.
[0010] In one aspect of this disclosure, the composite playing card paper is prepared by the following steps:
[0011] Step 1: Prepare SiO2 nanoparticles with hydrophilic modification on the surface;
[0012] Step 2: Prepare SiO2 composite particle solution;
[0013] Step 3: Prepare an acidic organosilicon oligomer solution;
[0014] Step 4: Prepare a polysilsesquioxane solution;
[0015] Step 5: Mix the SiO2 composite particle solution obtained in Step 2 and the polysilsesquioxane solution obtained in Step 4 to obtain a mixed solution; then mix it with the acidic organosilicon oligomer solution obtained in Step 3 to obtain a spraying solution.
[0016] Step 6: Provide a paper substrate layer, spray the back of the paper substrate layer with the spraying liquid obtained in Step 5, and after heating and curing, spray the front of the paper substrate layer, and after heating and curing again, obtain the composite playing card paper.
[0017] In one aspect of this disclosure, step 1 includes:
[0018] Step 1-1: Provide gaseous SiO2 nanoparticles with a D50 value of 75 μm and gaseous SiO2 nanoparticles with a D50 value of 25 μm; wherein the mass ratio of gaseous SiO2 nanoparticles with a D50 value of 75 μm to gaseous SiO2 nanoparticles with a D50 value of 25 μm is 4:1.
[0019] Step 1-2: Add the gaseous SiO2 nanoparticles provided in Step 1-1 to water, and then add sodium hypophosphite; after stirring, perform a hydrothermal reaction at 110℃-135℃ for 1-2 hours; then filter, wash, and dry to obtain the SiO2 nanoparticles with the surface modified by hydrophilicity.
[0020] In one aspect of this disclosure, step 2 includes:
[0021] Step 2-1: Mix anhydrous ethanol, water and ammonia, keep stirring at room temperature, then add tetraethyl orthosilicate, and react at 30℃-40℃ for 5-8 hours;
[0022] Step 2-2: Cool to room temperature, add the surface-modified hydrophilic SiO2 nanoparticles obtained in Step 1, and sonicate for 15-30 minutes to obtain the SiO2 composite particle solution.
[0023] In one aspect of this disclosure, step 3 includes:
[0024] Step 3-1: Add methyltriethoxysilane, tetraethyl orthosilicate, glacial acetic acid and citric acid to a mixed solution of anhydrous ethanol and water, and stir at room temperature for 1-3 hours;
[0025] Step 3-2: Mix the solution obtained in step 3-1 with anhydrous ethanol to obtain the acidic organosilicon oligomer solution.
[0026] In one aspect of this disclosure, step 4 includes:
[0027] Step 4-1: Add the polysilsesquioxane compound to anhydrous ethanol, then add water; stir at room temperature for 30-60 min; then sonicate for 30-60 min to obtain a polysilsesquioxane solution.
[0028] In one aspect of this disclosure, step 5 includes:
[0029] Step 5-1: Mix the SiO2 composite particle solution obtained in Step 2 and the polysilsesquioxane solution obtained in Step 4, and stir to obtain a mixed solution.
[0030] Step 5-2: Mix the mixture obtained in Step 5-1 with the acidic organosilicon oligomer solution, and then add KH-550 and KH-540 dropwise; after stirring, a spraying solution is obtained.
[0031] In one aspect of the embodiments of this disclosure, the polysilsesquioxane compound is selected from octaisobutyl-cage polysilsesquioxane.
[0032] The technical solutions provided by the embodiments of this disclosure may include the following beneficial effects:
[0033] As can be seen from the above embodiments, the present disclosure prepares a playing card paper that is both wear-resistant and antibacterial. Furthermore, the back of the playing card paper has a large frictional force between the back and the human hand, while the frictional force between the back and the front of the playing card paper is small, which is very beneficial for dealing and drawing cards.
[0034] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and are not intended to limit this disclosure. Detailed Implementation
[0035] Exemplary embodiments will now be described in detail. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this disclosure. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this disclosure as detailed in the appended claims.
[0036] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions of this application will be clearly and completely described below in conjunction with embodiments. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. The embodiments described herein are illustrative in nature and are used to provide a basic understanding of this application. The embodiments of this application should not be construed as limiting this application.
[0037] For the sake of brevity, this article only discloses a few specific numerical ranges. However, any lower limit can be combined with any upper limit to form an unspecified range; and any lower limit can be combined with other lower limits to form an unspecified range, just as any upper limit can be combined with any other upper limit to form an unspecified range. Furthermore, each individually disclosed point or single value can itself serve as a lower or upper limit and be combined with any other point or single value or with other lower or upper limits to form an unspecified range.
[0038] In this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.
[0039] In this description, unless otherwise stated, "above" and "below" include the stated number.
[0040] Unless otherwise stated, the terms used in this disclosure have their common meanings as commonly understood by those skilled in the art. Unless otherwise stated, the values of the parameters mentioned in this disclosure can be measured using various measurement methods commonly used in the art (e.g., they can be tested according to the methods given in the embodiments of this disclosure).
[0041] The term "about" is used to describe and indicate small variations. When used in conjunction with an event or situation, the term may refer to examples in which the event or situation occurred precisely or in examples in which the event or situation occurred very approximately. For example, when used in conjunction with numerical values, the term may refer to a range of variation less than or equal to ±10% of the numerical value, such as less than or equal to ±5%, less than or equal to ±4%, less than or equal to ±3%, less than or equal to ±2%, less than or equal to ±1%, less than or equal to ±0.5%, less than or equal to ±0.1%, or less than or equal to ±0.05%. Additionally, quantities, ratios, and other numerical values are sometimes presented in range format herein. It should be understood that such range format is for convenience and brevity and should be interpreted flexibly to include not only numerical values explicitly specified as range limits but also all individual numerical values or subranges covered within the range, as if each numerical value and subrange were explicitly specified.
[0042] The list of items connected by the terms "at least one of," "at least one of," "at least one of," or other similar terms can mean any combination of the listed items. For example, if items A and B are listed, then the phrase "at least one of A and B" means only A; only B; or A and B. In another instance, if items A, B, and C are listed, then the phrase "at least one of A, B, and C" means only A; or only B; only C; A and B (excluding C); A and C (excluding B); B and C (excluding A); or all of A, B, and C. Item A may contain a single component or multiple components. Item B may contain a single component or multiple components. Item C may contain a single component or multiple components.
[0043] The present invention will be further described below by way of specific embodiments. Unless otherwise specified, all chemical reagents used in the embodiments of the present invention were obtained through conventional commercial means. Unless otherwise specified, all contents mentioned below are mass contents. Unless otherwise specified, it is understood that the process was carried out at room temperature.
[0044] Examples and Comparative Examples
[0045] Example 1:
[0046] Example 1 includes the following steps:
[0047] 40 parts by weight of vapor-phase SiO2 nanoparticles with a D50 value of 75 μm and 10 parts by weight of vapor-phase SiO2 nanoparticles with a D50 value of 25 μm (both commercially available) were provided; the vapor-phase SiO2 nanoparticles were added to 250 parts by weight of water, and then 10 parts by weight of sodium hypophosphite were added; after stirring, the mixture was hydrothermally reacted at 120 °C for 1.5 h; then filtered, washed, and dried to obtain the surface-modified hydrophilic SiO2 nanoparticles of Example 1, which were then used for later use.
[0048] 150 parts by weight of anhydrous ethanol, 20 parts by weight of water and 5 parts by weight of ammonia (concentration 25%) were mixed and stirred at room temperature. Then 18 parts by weight of tetraethyl orthosilicate were added and reacted at 30°C for 6 hours. The mixture was then cooled to room temperature and 10 parts by weight of the aforementioned surface-modified hydrophilic SiO2 nanoparticles were added. The mixture was then sonicated for 20 minutes to obtain the SiO2 composite particle solution of Example 1.
[0049] Add 22 parts by weight of methyltriethoxysilane, 6 parts by weight of tetraethyl orthosilicate, 1 part by weight of glacial acetic acid and 1.5 parts by weight of citric acid to a mixed solution of 30 parts by weight of anhydrous ethanol and 5 parts by weight of water, and stir at room temperature for 2.5 h; then mix with 48 parts by weight of anhydrous ethanol to obtain the acidic organosilicon oligomer solution of Example 1.
[0050] Five parts by weight of octaisobutyl-cage-type polysilsesquioxane were added to 82 parts by weight of anhydrous ethanol, followed by 25 parts by weight of water. The mixture was stirred at room temperature for 45 minutes, then sonicated for 30 minutes to obtain a polysilsesquioxane solution. The SiO2 composite particle solution and the polysilsesquioxane solution were mixed and stirred to obtain a mixture. This mixture was then mixed with an acidic organosilicon oligomer solution, and 4.5 parts by weight of KH-550 and 3.5 parts by weight of KH-540 were added dropwise. After stirring, a spraying liquid was obtained. Playing card paper was provided. The spraying liquid was poured into a spray gun and sprayed at a pressure of 90 kPa. Four rapid back-and-forth sprays were performed as one set (spray gun nozzle 15 cm away from the card). After three sets of sprays (coating amount approximately 10 g / m²), the coating was applied. 2 The coating is obtained by heating the coating at 150°C for 1 hour in a glue drying machine; then the coating is flipped over and the above steps are continued to obtain the composite playing card paper of Example 1.
[0051] Example 2:
[0052] Example 2 includes the following steps:
[0053] 40 parts by weight of vapor-phase SiO2 nanoparticles with a D50 value of 75 μm and 10 parts by weight of vapor-phase SiO2 nanoparticles with a D50 value of 25 μm (both commercially available) were provided; the vapor-phase SiO2 nanoparticles were added to 250 parts by weight of water, and then 40 parts by weight of ammonia water (concentration 25%) were added; after stirring, the mixture was refluxed at 70°C for 2 hours; then filtered, washed, and dried to obtain the surface-modified hydrophilic SiO2 nanoparticles of Example 2, which were used for later use.
[0054] 150 parts by weight of anhydrous ethanol, 20 parts by weight of water and 5 parts by weight of ammonia (concentration 25%) were mixed and stirred at room temperature. Then 18 parts by weight of tetraethyl orthosilicate were added and reacted at 30°C for 6 hours. The mixture was then cooled to room temperature and 10 parts by weight of the aforementioned surface-modified hydrophilic SiO2 nanoparticles were added. The mixture was then sonicated for 20 minutes to obtain the SiO2 composite particle solution of Example 2.
[0055] Add 22 parts by weight of methyltriethoxysilane, 6 parts by weight of tetraethyl orthosilicate, 1 part by weight of glacial acetic acid and 1.5 parts by weight of citric acid to a mixed solution of 30 parts by weight of anhydrous ethanol and 5 parts by weight of water, and stir at room temperature for 2.5 h; then mix with 48 parts by weight of anhydrous ethanol to obtain the acidic organosilicon oligomer solution of Example 2.
[0056] Five parts by weight of octaisobutyl-cage-shaped polysilsesquioxane were added to 82 parts by weight of anhydrous ethanol, followed by 25 parts by weight of water. The mixture was stirred at room temperature for 45 minutes, and then sonicated for 30 minutes to obtain a polysilsesquioxane solution. The SiO2 composite particle solution and the polysilsesquioxane solution were mixed and stirred to obtain a mixture. This mixture was then mixed with an acidic organosilicon oligomer solution, and 4.5 parts by weight of KH-550 and 3.5 parts by weight of KH-540 were added dropwise. After stirring, a spraying liquid was obtained. Playing card paper was provided, and the spraying liquid was poured into a spray gun. Spraying was performed at a pressure of 90 kPa, with four rapid back-and-forth sprays constituting one set. After three sets, the paper was heated in a glue oven at 150°C for 1 hour to obtain a coating. The paper was then flipped over, and the above steps were repeated to obtain the composite playing card paper of Example 2.
[0057] The difference between Example 2 and Example 1 is that Example 2 uses ammonia to hydrophilize SiO2 nanoparticles.
[0058] Example 3:
[0059] Example 3 includes the following steps:
[0060] 150 parts by weight of anhydrous ethanol, 20 parts by weight of water and 5 parts by weight of ammonia (concentration 25%) were mixed and stirred at room temperature. Then 18 parts by weight of tetraethyl orthosilicate were added and reacted at 30°C for 6 hours. The mixture was then cooled to room temperature and 10 parts by weight of the aforementioned surface-modified hydrophilic SiO2 nanoparticles were added. The mixture was then sonicated for 20 minutes to obtain the SiO2 composite particle solution of Example 3.
[0061] Add 22 parts by weight of methyltriethoxysilane, 6 parts by weight of tetraethyl orthosilicate, 1 part by weight of glacial acetic acid and 1.5 parts by weight of citric acid to a mixed solution of 30 parts by weight of anhydrous ethanol and 5 parts by weight of water, and stir at room temperature for 2.5 h; then mix with 48 parts by weight of anhydrous ethanol to obtain the acidic organosilicon oligomer solution of Example 3.
[0062] Five parts by weight of octaisobutyl-cage-shaped polysilsesquioxane were added to 82 parts by weight of anhydrous ethanol, followed by 25 parts by weight of water. The mixture was stirred at room temperature for 45 minutes, and then sonicated for 30 minutes to obtain a polysilsesquioxane solution. The SiO2 composite particle solution and the polysilsesquioxane solution were mixed and stirred to obtain a mixture. This mixture was then mixed with an acidic organosilicon oligomer solution, and 4.5 parts by weight of KH-550 and 3.5 parts by weight of KH-540 were added dropwise. After stirring, a spraying liquid was obtained. Playing card paper was provided, and the spraying liquid was poured into a spray gun. Spraying was performed at a pressure of 90 kPa, with four rapid back-and-forth sprays constituting one set. After three sets, the paper was heated in a glue oven at 150°C for 1 hour to obtain a coating. The paper was then flipped over, and the above steps were repeated to obtain the composite playing card paper of Example 3.
[0063] The difference between Example 3 and Example 1 is that Example 3 does not use gaseous SiO2 nanoparticles.
[0064] Example 4:
[0065] Example 4 includes the following steps:
[0066] 40 parts by weight of vapor-phase SiO2 nanoparticles with a D50 value of 75 μm and 10 parts by weight of vapor-phase SiO2 nanoparticles with a D50 value of 25 μm (both commercially available) were provided; the vapor-phase SiO2 nanoparticles were added to 250 parts by weight of water, and then 10 parts by weight of sodium hypophosphite were added; after stirring, the mixture was hydrothermally reacted at 120 °C for 1.5 h; then filtered, washed, and dried to obtain the surface-modified hydrophilic SiO2 nanoparticles of Example 4, which were then used for later use.
[0067] 150 parts by weight of anhydrous ethanol, 20 parts by weight of water and 5 parts by weight of ammonia (concentration 25%) were mixed and stirred at room temperature. Then 18 parts by weight of tetraethyl orthosilicate were added and reacted at 30°C for 6 hours. The mixture was then cooled to room temperature and 10 parts by weight of the aforementioned surface-modified hydrophilic SiO2 nanoparticles were added. The mixture was then sonicated for 20 minutes to obtain the SiO2 composite particle solution of Example 4.
[0068] Add 22 parts by weight of methyltriethoxysilane, 6 parts by weight of tetraethyl orthosilicate, 1 part by weight of glacial acetic acid and 1.5 parts by weight of citric acid to a mixed solution of 30 parts by weight of anhydrous ethanol and 5 parts by weight of water, and stir at room temperature for 2.5 h; then mix with 48 parts by weight of anhydrous ethanol to obtain the acidic organosilicon oligomer solution of Example 4.
[0069] A SiO2 composite particle solution was mixed with an acidic organosilicon oligomer solution, and then 4.5 parts by weight of KH-550 and 3.5 parts by weight of KH-540 were added dropwise. After stirring, a spraying liquid was obtained. Playing card paper was provided, and the spraying liquid was poured into a spray gun. Spraying was carried out under a spray gun pressure of 90 kPa. Four rapid back-and-forth sprays were performed as one set. After three sets of spraying, the paper was heated in a glue oven at 150°C for 1 hour to obtain a coating. Then the paper was flipped over, and the above steps were repeated to obtain the composite playing card paper of Example 4.
[0070] The main difference between Example 4 and Example 1 is that Example 4 does not use octaisobutyl-cage polysilsesquioxane.
[0071] Comparative Example 1:
[0072] Comparative Example 1 is commercially available playing card paper coated with water-based varnish.
[0073] Abrasion resistance test, antibacterial ability test, coefficient of friction test, and card-touching test:
[0074] The abrasion resistance test was conducted on the samples of Examples 1-4 using an alcohol abrasion tester; the applied force was 25g, the frequency was 20 times / minute; the friction was carried out for 10 minutes, and the paper base of the playing card paper was observed to see if there was any damage; the results are shown in Table 1.
[0075] The antibacterial test was conducted using the antibacterial performance test described in Appendix GB15979-2002. The standard bacterium used was Escherichia coli, and the contact time was 20 minutes. The inhibition rate is shown in Table 1.
[0076] The coefficient of friction between the playing cards obtained in Examples 1-4 was tested using a horizontal sliding friction tester. A card (back side up) was placed on the table; a card (front side up) was attached to the slider; the applied force was 100g; the stroke was 60mm, and the value of the middle 40mm was taken. Similarly, the coefficient of friction between the playing cards obtained in Examples 1-4 and the hand was tested using a horizontal sliding friction tester. A rubber block with a latex film on its surface was used to simulate human hand skin; the rubber block was fixed to the bottom of the slider; a card was placed on the table; the applied force was 160g; the stroke was 60mm, and the value of the middle 40mm was taken. All the above tests were conducted at room temperature, and the results are shown in Table 1.
[0077] Take one deck (54 cards) of playing cards obtained in Examples 1-4, and have three testers draw all 54 cards of each sample in turn, and calculate the total time taken; each group is tested 3 times, and the average value is selected. The results are shown in Table 1.
[0078] Table 1
[0079] Example Abrasion resistance test Antibacterial rate (%) Card-to-card friction coefficient (μk) Card-hand friction coefficient (μk) Time to draw a card (s) Example 1 No damage 85.2 0.12 0.44 30 Example 2 No damage 80.4 0.14 0.40 35 Example 3 There is obvious damage 75.8 0.28 0.32 44 Example 4 Minor damage 84.1 0.16 0.36 39 Comparative Example 1 There is obvious damage 72.7 0.23 0.35 45
[0080] As can be seen, this disclosure not only provides a playing card paper that is both wear-resistant and antibacterial, but also exhibits greater friction between the back of the playing card paper and the human hand, while having less friction between the back and front of the playing card paper, which is highly beneficial for dealing and drawing cards. It can be seen that Example 1 is superior to Example 4. This is because polysilsesquioxane itself has low surface energy, thus reducing the coefficient of friction between the back and front of the playing card paper. Furthermore, the cage-like structure of polysilsesquioxane can form a micro-convex structure, which can combine with fingerprints on the surface of the human hand, creating greater friction.
[0081] Other embodiments of this disclosure will readily occur to those skilled in the art upon consideration of the specification and practice of the disclosure herein. This disclosure is intended to cover any variations, uses, or adaptations of this disclosure that follow the general principles of this disclosure and include common knowledge or customary techniques in the art not disclosed herein.
Claims
1. A composite playing card paper containing nanomaterials that is wear-resistant and antibacterial, characterized in that, The composite playing card paper includes the following structure: A paper substrate layer, a first transparent composite layer of nanoparticles and polymers disposed on the back side of the paper substrate layer, and a second transparent composite layer of nanoparticles and polymers disposed on the front side of the paper substrate layer; The first transparent composite layer and the second transparent composite layer of nanoparticles-polymer contain SiO2 nanoparticles with hydrophilic modification on their surface.
2. The composite playing card paper according to claim 1, characterized in that, The surface-modified hydrophilic SiO2 nanoparticles comprise a first SiO2 nanoparticle and a second SiO2 nanoparticle; the D50 value of the first SiO2 nanoparticle is selected from 50-85 μm, and the D50 value of the second SiO2 nanoparticle is selected from 15-35 μm; and the mass ratio of the first SiO2 nanoparticle to the second SiO2 nanoparticle is selected from (3-6):
1.
3. The composite playing card paper according to claim 1 or 2, characterized in that, The composite playing card paper is prepared through the following steps: Step 1: Prepare SiO2 nanoparticles with hydrophilic modification on the surface; Step 2: Prepare SiO2 composite particle solution; Step 3: Prepare an acidic organosilicon oligomer solution; Step 4: Prepare a polysilsesquioxane solution; Step 5: Mix the SiO2 composite particle solution obtained in Step 2 and the polysilsesquioxane solution obtained in Step 4 to obtain a mixed solution; then mix it with the acidic organosilicon oligomer solution obtained in Step 3 to obtain a spraying solution. Step 6: Provide a paper substrate layer, spray the back of the paper substrate layer with the spraying liquid obtained in Step 5, and after heating and curing, spray the front of the paper substrate layer, and after heating and curing again, obtain the composite playing card paper.
4. The composite playing card paper according to claim 3, characterized in that, Step 1 includes: Step 1-1: Provide gaseous SiO2 nanoparticles with a D50 value of 75 μm and gaseous SiO2 nanoparticles with a D50 value of 25 μm; wherein the mass ratio of gaseous SiO2 nanoparticles with a D50 value of 75 μm to gaseous SiO2 nanoparticles with a D50 value of 25 μm is 4:
1. Step 1-2: Add the gaseous SiO2 nanoparticles provided in Step 1-1 to water, and then add sodium hypophosphite; after stirring, perform a hydrothermal reaction at 110℃-135℃ for 1-2 hours; then filter, wash, and dry to obtain the SiO2 nanoparticles with the surface modified by hydrophilicity.
5. The composite playing card paper according to claim 3, characterized in that, Step 2 includes: Step 2-1: Mix anhydrous ethanol, water and ammonia, keep stirring at room temperature, then add tetraethyl orthosilicate, and react at 30℃-40℃ for 5-8 hours; Step 2-2: Cool to room temperature, add the surface-modified hydrophilic SiO2 nanoparticles obtained in Step 1, and sonicate for 15-30 minutes to obtain the SiO2 composite particle solution.
6. The composite playing card paper according to claim 3, characterized in that, Step 3 includes: Step 3-1: Add methyltriethoxysilane, tetraethyl orthosilicate, glacial acetic acid and citric acid to a mixed solution of anhydrous ethanol and water, and stir at room temperature for 1-3 hours; Step 3-2: Mix the solution obtained in step 3-1 with anhydrous ethanol to obtain the acidic organosilicon oligomer solution.
7. The composite playing card paper according to claim 3, characterized in that, Step 4 includes: Step 4-1: Add the polysilsesquioxane compound to anhydrous ethanol, then add water; stir at room temperature for 30-60 min; then sonicate for 30-60 min; to obtain a polysilsesquioxane solution.
8. The composite playing card paper according to claim 3, characterized in that, Step 5 includes: Step 5-1: Mix the SiO2 composite particle solution obtained in Step 2 and the polysilsesquioxane solution obtained in Step 4, and stir to obtain a mixture. Step 5-2: Mix the mixture obtained in Step 5-1 with the acidic organosilicon oligomer solution, and then add KH-550 and KH-540 dropwise; after stirring, a spraying solution is obtained.
9. The composite playing card paper according to claim 7, characterized in that, The polysilsesquioxane compound is selected from octaisobutyl-cage polysilsesquioxane.