High-temperature-resistant and anti-aging method for production of light-weight paper-based facing material

Abstract

The invention relates to the field of papermaking, and particularly provides a high-temperature-resistant anti-aging method for producing a light-weight paper-based facing material, which comprises the following steps: S100, adding aramid fiber and mica powder into bleached softwood pulp, uniformly stirring, and carrying out on-net papermaking to obtain a paper base; s200, dipping the paper base in a reinforcing solution to obtain an intermediate paper base; and S300, the surface of the intermediate paper base is coated with the protective coating emulsion, and the light-weight paper-based facing material is obtained. Wherein the enhancing solution is a melamine-siloxane copolymer solution. The aramid fibers and the mica powder are added into the bleached softwood pulp, and the aramid fibers can provide thermal stability and high-strength rigidity, inhibit high-temperature shrinkage and thermal brittleness of the paper base, form a hydrogen bond network with the wood pulp fibers, and improve the crack resistance; the mica powder is good in thermal stability and insulativity and is used as an inorganic barrier, so that the heat resistance and the dimensional stability are improved; through composite reinforcement of the aramid fiber and the mica powder, a structural framework and an inorganic barrier are provided for the paper base.

Description

Technical Field

[0001] The present invention relates to the technical field of papermaking, and in particular to a high-temperature resistant and anti-aging method for producing lightweight paper-based finishing materials. Background Art

[0002] With the continuous development of the modern papermaking industry, lightweighting of paper-based finishing materials has become a trend to improve material performance and reduce costs. During processing steps such as hot pressing, lamination, and UV coating, paper-based finishing needs to withstand instantaneous temperatures of 150-180°C or even higher, and paper-based materials are prone to deformation, yellowing, and blistering. Currently, a layer of resin coating is usually added to the surface of the paper-based material to prevent aging of the paper-based material at high temperatures. However, resin coatings are brittle and have a low heat resistance limit. They are prone to carbonization or precipitation of volatile substances at high temperatures, and cannot completely prevent the aging of paper-based materials at high temperatures.

[0003] Therefore, there is an urgent need to provide a high-temperature resistant and anti-aging method for the production of lightweight paper-based finishing materials with better anti-aging effects. Summary of the Invention

[0004] The present invention aims to solve at least one of the above problems.

[0005] The present invention provides a high-temperature resistant and anti-aging method for producing a lightweight paper-based finishing material, the anti-aging method comprising the following steps: S100, adding aramid fiber and mica powder to bleached softwood pulp, stirring evenly, and making paper on a screen to obtain a paper base; S200, immersing the paper base in a strengthening solution to obtain an intermediate paper base; S300, coating the protective coating emulsion on the surface of the intermediate paper base to obtain a lightweight paper-based finishing material; Wherein, the reinforcing solution is a melamine-siloxane copolymer solution.

[0006] In the above technical solution, the preparation method of the melamine-siloxane copolymer solution comprises: S201, adding nano-titanium dioxide and a dispersant into ethanol, and uniformly dispersing them under ultrasonic conditions to obtain a nano-titanium dioxide dispersion; S202, mixing the melamine-formaldehyde prepolymer and the modified silicone resin and stirring them uniformly to obtain a mixed resin; S203, adding the nano-titanium dioxide dispersion into the mixed resin to obtain a melamine-siloxane copolymer solution.

[0007] In any of the above technical solutions, in S201, the mass ratio of nano-titanium dioxide, dispersant and ethanol is (0.3-0.5):(0.01-0.05):1; and / or in S202, the mass ratio of melamine-formaldehyde prepolymer and modified silicone resin is (3-4):1.

[0008] In any of the above technical solutions, the viscosity of the melamine-siloxane copolymer solution is 100-200 mPa·s.

[0009] In any of the above technical solutions, in S300, the method for preparing the protective coating emulsion includes: S301, dispersing nano-silicon dioxide in deionized water to obtain a nano-silicon dioxide dispersion; S302, adding the silicone resin solution to the acrylic emulsion and stirring evenly to obtain a silicone resin-acrylic emulsion; S303, adding the nano-silica dispersion, ultraviolet absorber, fluorocarbon additive and auxiliary agent into the silicone resin-acrylic emulsion, stirring evenly, adjusting the viscosity, and obtaining a protective coating emulsion.

[0010] In any of the above technical solutions, in S303 , the viscosity is adjusted to 80-150 mPa·s.

[0011] In any of the above technical solutions, in S301, the mass ratio of nano-silicon dioxide to deionized water is (0.1-0.5):1; and / or in S302, the mass ratio of the silicone resin solution to the acrylic emulsion is 1:(2-3).

[0012] In any of the above technical solutions, in S303, the auxiliary agent includes at least one of a dispersant and a leveling agent, or a combination thereof.

[0013] In any of the above technical solutions, in S100, the mass ratio of bleached coniferous pulp, aramid fiber and mica powder is 1: (0.4-0.5): (0.1-0.2).

[0014] In any of the above technical solutions, the length of the aramid fiber is 1-3 mm; and / or the particle size of the mica powder is less than 2 μm.

[0015] After adopting the technical solution of the present invention, the technical effects that can be achieved are as follows: 1. Aramid fiber and mica powder are added to bleached softwood pulp. Aramid fiber provides thermal stability and high strength, inhibiting high-temperature shrinkage and thermal embrittlement of the paper base. It also forms a hydrogen bond network with the wood pulp fiber, improving crack resistance. Mica powder has good thermal stability and insulation properties, and acts as an inorganic barrier to improve heat resistance and dimensional stability. The composite reinforcement of aramid fiber and mica powder provides a structural framework and inorganic barrier for the paper base. 2. The enhancing solution is preferably a melamine-siloxane copolymer solution, which can introduce a highly cross-linked resin network into the paper base, thereby improving the paper base's thermosetting stability, yellowing resistance, and interfacial protection. 3. A protective coating emulsion is applied to the surface of the intermediate paper base to construct a surface protective layer on the surface of the paper base material, thereby improving the material's UV resistance, anti-pollution, hydrophobicity, anti-fingerprint, and chemical corrosion resistance. DETAILED DESCRIPTION

[0016] In order to more clearly understand the above-mentioned objects, features and advantages of the present invention, the present invention is further described in detail below in conjunction with specific embodiments. It should be noted that, in the absence of conflict, the embodiments of the present application and the features therein can be combined with each other.

[0017] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the scope of protection of the present invention is not limited to the specific embodiments disclosed below.

[0018] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below.

[0019] With the continuous development of the modern papermaking industry, lightweighting of paper-based finishing materials has become a trend to improve material performance and reduce costs. However, adding a resin coating to the surface of paper-based materials to prevent aging at high temperatures cannot completely prevent the aging of paper-based materials at high temperatures due to their brittleness and low heat resistance. They easily carbonize or release volatile substances at high temperatures.

[0020] In view of this, the present invention provides a high-temperature resistant and anti-aging method for the production of lightweight paper-based finishing materials. The high-temperature resistant effect of the paper-based material is achieved by adding aramid fiber and mica powder to bleached coniferous pulp, immersing the paper base in an enhancing solution for impregnation modification, and finally applying a protective coating.

[0021] Specifically, this embodiment provides a high-temperature resistant and anti-aging method for producing a lightweight paper-based finishing material, the anti-aging method comprising the following steps: S100, adding aramid fiber and mica powder to bleached softwood pulp, stirring evenly, and making paper on a screen to obtain a paper base; S200, immersing the paper base in a strengthening solution to obtain an intermediate paper base; S300, coating the protective coating emulsion on the surface of the intermediate paper base to obtain a lightweight paper base finishing material.

[0022] Preferably, aramid fiber and mica powder are first added to bleached coniferous wood pulp. The thermal decomposition temperature of aramid fiber is greater than 500°C, which can provide thermal stability and high strength and rigidity, inhibit high-temperature shrinkage and thermal brittleness of the paper base; form a hydrogen bond network with wood pulp fiber to improve crack resistance; mica powder has good thermal stability and insulation, and acts as an inorganic barrier to improve heat resistance and dimensional stability; the composite reinforcement of aramid fiber and mica powder provides a structural skeleton and inorganic barrier for the paper base, and the mass ratio of bleached coniferous wood pulp, aramid fiber and mica powder is preferably 1: (0.4-0.5): (0.1-0.2); the length of the aramid fiber is 1-3mm, which ensures that the fiber is well dispersed in the pulp and can be cross-linked into a network, thereby enhancing tensile and heat resistance, and more than 3 mm is easy to tangle, and the reinforcement effect is weakened if it is less than 1mm; the particle size of mica powder is less than 2μm, and the fine particle size helps to evenly fill the pores between fibers, enhance the density and insulation of the paper base, form a multi-layer thermal barrier, and enhance thermal stability; the prepared paper base is immersed in a reinforcing solution, and the reinforcing solution is preferably a melamine-siloxane copolymer solution, which can introduce a high cross-linked resin network into the paper base to improve the thermosetting stability, yellowing resistance and interface protection of the paper base. The melamine-siloxane copolymer can be quickly cured to form a dense cross-linked network, improve dimensional stability and thermal hardness, thereby forming a barrier between the paper base and the external environment, and improving the heat resistance and service life of the paper base; finally, a protective coating emulsion is coated on the surface of the intermediate paper base. Since aging mostly occurs on the surface of the paper base material, constructing a surface protective layer on the surface of the paper base material can improve the material's anti-ultraviolet, anti-pollution, hydrophobic anti-fingerprint and chemical corrosion resistance.

[0023] Furthermore, the preparation method of the melamine-siloxane copolymer solution comprises: S201, adding nano-titanium dioxide and a dispersant into ethanol, and uniformly dispersing them under ultrasonic conditions to obtain a nano-titanium dioxide dispersion; S202, mixing the melamine-formaldehyde prepolymer and the modified silicone resin and stirring them uniformly to obtain a mixed resin; S203, adding the nano-titanium dioxide dispersion into the mixed resin to obtain a melamine-siloxane copolymer solution.

[0024] Preferably, the melamine-siloxane copolymer can provide a rigid triazine ring cross-linked network with a heat-resistant temperature of more than 200°C. It is not easy to crack even after thermal expansion and contraction. Nano-titanium dioxide can effectively absorb UV bands and cooperate with ultraviolet absorbers to inhibit light aging. In the process of preparing the melamine-silicone copolymer solution, the nano-titanium dioxide is first dispersed in ethanol. The nano-titanium dioxide particle size is easy to agglomerate. By adding a dispersant such as sodium dodecyl sulfate, PVP (polyvinyl pyrrolidone), etc. and performing ultrasonic treatment during the dispersion process, a highly stable dispersion system can be formed, providing good compatibility for subsequent mixed resins. The mass ratio of nano-titanium dioxide, dispersant and ethanol is (0.3-0.5): (0.01-0.05): 1, which can ensure uniform dispersion and avoid agglomeration or viscosity increase caused by high concentration. The melamine-formaldehyde prepolymer and the modified silicone resin are mixed and stirred evenly. The melamine-formaldehyde prepolymer has a large amount of active amino The modified silicone resin has functional groups such as hydroxyl, epoxy, and aminopropyl, and can be copolymerized with melamine through condensation or etherification reactions to form an interpenetrating network structure, thereby improving brittleness and thermal fatigue stability. The mass ratio of melamine-formaldehyde prepolymer to modified silicone resin is (3-4):1. This moderate ratio of melamine-formaldehyde prepolymer to modified silicone resin can ensure that the prepared melamine-siloxane copolymer solution has a suitable viscosity. A nano-titanium dioxide dispersion is added to the mixed resin. The nano-titanium dioxide can be uniformly dispersed in the copolymer matrix in the resin network, improving the crosslinking degree and density. It can also act as thermal buffer particles at high temperatures to improve decomposition resistance under thermal aging, delay degradation of the melamine resin, and ultimately impart better anti-aging properties to the paper base. The viscosity of the final melamine-siloxane copolymer solution is 100-200 mPa·s, which meets the requirements of industrial applications while ensuring the quality of the impregnation treatment.

[0025] Preferably, in S300, the method for preparing the protective coating emulsion includes: S301, dispersing nano-silicon dioxide in deionized water to obtain a nano-silicon dioxide dispersion; S302, adding the silicone resin solution to the acrylic emulsion and stirring evenly to obtain a silicone resin-acrylic emulsion; S303, adding the nano-silica dispersion, ultraviolet absorber, fluorocarbon additive and auxiliary agent into the silicone resin-acrylic emulsion, stirring evenly, adjusting the viscosity, and obtaining a protective coating emulsion.

[0026] Preferably, nano-silica is first dispersed in deionized water. The particle size of nano-silica is usually 15-30 nm, and it is very easy to agglomerate, especially in organic coatings, which will reduce transparency and density. It is dispersed in deionized water to form a transparent and stable dispersion. To ensure the dispersion effect, ultrasonic treatment or appropriate dispersion such as sodium polyacrylate or Triton X-100 can be used. The mass ratio of nano-silica to deionized water is (0.1-0.5):1. Within this ratio range, the nano-silica particles can be stably dispersed in water, avoiding agglomeration or sedimentation, ensuring that the transparency of the system is not affected after subsequent mixing into the organic coating system, and preventing emulsion phase separation.

[0027] Furthermore, the silicone resin solution is added to the acrylic emulsion. The acrylic emulsion has good film-forming properties, strong adhesion, and excellent water resistance, which ensures that the coating structure forms a film and adheres to the substrate. The silicone resin has the characteristics of high-temperature stability, UV resistance, and low surface energy. After mixing them, its performance is better than using a single material. The mass ratio of the silicone resin solution and the acrylic emulsion is 1: (2-3), with the acrylic emulsion as the main component, ensuring good adhesion, water resistance and flexibility, and is suitable for paper-based surfaces. The silicone content is moderate, giving it a Si-O-Si network structure, improving heat resistance and anti-aging capabilities, and avoiding stratification or whitening caused by a sharp increase in viscosity or interface incompatibility.

[0028] Preferably, the nano-silica dispersion, ultraviolet absorber, fluorocarbon additive and auxiliary agent are finally added to the silicone resin-acrylic emulsion, and the viscosity is adjusted to 80-150 mPa·s. This viscosity range is suitable for mainstream processes such as knife coating, roller coating, and spraying, has good fluidity and spreadability, and is not prone to problems such as drawing, accumulation, and splashing; the ultraviolet absorber can absorb ultraviolet light, inhibit the photoaging chain reaction, and extend the service life; the fluorocarbon additive can reduce the surface energy, form a hydrophobic, oil-proof and anti-fingerprint coating, improve the surface stain resistance, realize the integrated and uniform distribution of organic-inorganic-functional additives, avoid common defects such as stratification, precipitation, and aggregation, so that the prepared protective coating emulsion has ultraviolet resistance, pollution resistance, strong thermal stability, and strong adhesion, and can better adhere to the paper base surface.

[0029] Preferably, the additive includes at least one of a dispersant and a leveling agent or a combination thereof. The dispersant can stabilize the uniformity of components such as nano-silica and ultraviolet absorbers to prevent aggregation and precipitation; the leveling agent improves the spreading property of the coating, eliminates brush marks, shrinkage holes, and orange peel phenomena, and improves the film quality and surface uniformity.

[0030] Example 1 This embodiment provides a high temperature resistant and anti-aging method for producing a lightweight paper-based finishing material, the anti-aging method comprising the following steps: S100, adding aramid fiber and mica powder to bleached softwood pulp and stirring evenly, wherein the mass ratio of bleached softwood pulp, aramid fiber and mica powder is preferably 1:0.4:0.1, the length of the aramid fiber is 1 mm, the particle size of the mica powder is less than 2 μm, and papermaking is performed on a screen to obtain a paper base; S200, immersing the paper base in a strengthening solution to obtain an intermediate paper base; S300, coating the protective coating emulsion on the surface of the intermediate paper base to obtain a lightweight paper-based finishing material; The reinforcing solution is a melamine-siloxane copolymer solution.

[0031] Example 2 This embodiment provides a high temperature resistant and anti-aging method for producing a lightweight paper-based finishing material, the anti-aging method comprising the following steps: S100, adding aramid fiber and mica powder to bleached softwood pulp and stirring evenly, wherein the mass ratio of bleached softwood pulp, aramid fiber and mica powder is preferably 1:0.5:0.2, the length of the aramid fiber is 3 mm, the particle size of the mica powder is less than 2 μm, and papermaking is performed on a screen to obtain a paper base; S200, immersing the paper base in a strengthening solution to obtain an intermediate paper base; S300, coating the protective coating emulsion on the surface of the intermediate paper base to obtain a lightweight paper-based finishing material; The reinforcing solution is a melamine-siloxane copolymer solution having a viscosity of 100 mPa·s. The preparation method of the melamine-siloxane copolymer solution comprises: S201, adding nano-titanium dioxide and a dispersant to ethanol, wherein the mass ratio of nano-titanium dioxide, dispersant and ethanol is 0.3:0.01:1, and uniformly dispersing under ultrasonic conditions to obtain a nano-titanium dioxide dispersion; S202, mixing melamine-formaldehyde prepolymer and modified silicone resin in a mass ratio of 3:1 and stirring uniformly to obtain a mixed resin; S203, adding the nano-titanium dioxide dispersion into the mixed resin to obtain a melamine-siloxane copolymer solution.

[0032] Example 3 This embodiment provides a high temperature resistant and anti-aging method for producing a lightweight paper-based finishing material, the anti-aging method comprising the following steps: S100, adding aramid fiber and mica powder to bleached softwood pulp and stirring evenly, wherein the mass ratio of bleached softwood pulp, aramid fiber and mica powder is preferably 1:0.5:0.2, the length of the aramid fiber is 2 mm, the particle size of the mica powder is less than 2 μm, and papermaking is performed on a screen to obtain a paper base; S200, immersing the paper base in a strengthening solution to obtain an intermediate paper base; S300, coating the protective coating emulsion on the surface of the intermediate paper base to obtain a lightweight paper-based finishing material; The reinforcing solution is a melamine-siloxane copolymer solution having a viscosity of 200 mPa·s. The preparation method of the melamine-siloxane copolymer solution comprises: S201, adding nano-titanium dioxide and a dispersant to ethanol, wherein the mass ratio of nano-titanium dioxide, dispersant and ethanol is 0.5:0.05:1, and uniformly dispersing under ultrasonic conditions to obtain a nano-titanium dioxide dispersion; S202, mixing melamine-formaldehyde prepolymer and modified silicone resin in a mass ratio of 4:1 and stirring uniformly to obtain a mixed resin; S203, adding the nano-titanium dioxide dispersion to the mixed resin to obtain a melamine-siloxane copolymer solution; In S300, the method for preparing the protective coating emulsion includes: S301, dispersing nano-silicon dioxide in deionized water, with the mass ratio of nano-silicon dioxide to deionized water being 0.1:1, to obtain a nano-silicon dioxide dispersion; S302, adding the silicone resin solution to the acrylic emulsion, with the mass ratio of the silicone resin solution to the acrylic emulsion being 1:2, and stirring evenly to obtain a silicone resin-acrylic emulsion; S303, adding nano-silica dispersion, ultraviolet absorber, fluorocarbon additive, leveling agent and dispersant to silicone resin-acrylic emulsion, stirring evenly, adjusting viscosity, and obtaining protective coating emulsion.

[0033] Example 4 This embodiment provides a high temperature resistant and anti-aging method for producing a lightweight paper-based finishing material, the anti-aging method comprising the following steps: S100, adding aramid fiber and mica powder to bleached softwood pulp and stirring evenly, wherein the mass ratio of bleached softwood pulp, aramid fiber and mica powder is preferably 1:0.5:0.2, the length of the aramid fiber is 2 mm, the particle size of the mica powder is less than 2 μm, and papermaking is performed on a screen to obtain a paper base; S200, immersing the paper base in a strengthening solution to obtain an intermediate paper base; S300, coating the protective coating emulsion on the surface of the intermediate paper base to obtain a lightweight paper-based finishing material; The reinforcing solution is a melamine-siloxane copolymer solution having a viscosity of 150 mPa·s. The preparation method of the melamine-siloxane copolymer solution comprises: S201, adding nano-titanium dioxide and a dispersant to ethanol, wherein the mass ratio of nano-titanium dioxide, dispersant and ethanol is 0.4:0.04:1, and uniformly dispersing under ultrasonic conditions to obtain a nano-titanium dioxide dispersion; S202, mixing melamine-formaldehyde prepolymer and modified silicone resin in a mass ratio of 4:1 and stirring uniformly to obtain a mixed resin; S203, adding the nano-titanium dioxide dispersion to the mixed resin to obtain a melamine-siloxane copolymer solution; In S300, the method for preparing the protective coating emulsion includes: S301, dispersing nano-silicon dioxide in deionized water, with the mass ratio of nano-silicon dioxide to deionized water being 0.5:1, to obtain a nano-silicon dioxide dispersion; S302, adding the silicone resin solution to the acrylic emulsion, with the mass ratio of the silicone resin solution to the acrylic emulsion being 1:3, and stirring evenly to obtain a silicone resin-acrylic emulsion; S303, adding nano-silica dispersion, ultraviolet absorber, fluorocarbon additive, leveling agent and dispersant to silicone resin-acrylic emulsion, stirring evenly, adjusting viscosity, and obtaining protective coating emulsion.

[0034] Comparative Example A high-temperature resistant and anti-aging method for producing lightweight paper-based finishing materials, comprising coating a melamine resin coating on the surface of the lightweight paper-based finishing material.

[0035] Performance Testing The high temperature resistant and anti-aging methods for producing lightweight paper-based finishing materials in Examples 1-4 and the comparative example were used to sample the lightweight paper-based finishing materials obtained in Examples 1-4 and the comparative example, and the following tests were performed: Thermal stability test: Using thermogravimetric analysis in a nitrogen or air atmosphere at a heating rate of 10°C / min from 25°C to 600°C, the samples of Examples 1-4 began to lose weight at 280°C, with a maximum peak temperature of 395°C and a carbon residue rate of 32.5% at 600°C. In contrast, the samples in the comparative example began to lose weight at 230°C, with a maximum peak temperature of 345°C and a carbon residue rate of 19.7% at 600°C. This indicates that the thermal stability of the samples y in Examples 1-4 was significantly improved compared to the comparative example, with delayed decomposition and increased carbon residue, indicating that the system is more resistant to high temperatures. UV aging test: UV aging box, 340nm UVA lamp, irradiation intensity 0.89 W / m 2The samples of Examples 1-4 and the comparative example were irradiated for 96 hours, and the color difference between them was measured using a colorimeter. The color difference of the sample of Example 1 was 1.5, the color difference of the sample of Example 2 was 1.5, the color difference of the sample of Example 3 was 1.4, the color difference of the sample of Example 4 was 1.2, and the color difference of the sample of the comparative example was 4.8, indicating that Examples 1-4 had significantly better resistance to UV aging than the comparative example, with less discoloration and more stable structure. Hygrothermal aging test: After aging for 168 hours at 85°C and 85% RH, the dimensional changes of the samples were measured. The dimensional changes of the samples in Examples 1 and 2 were 0.9%, the dimensional changes of the samples in Examples 3 and 4 were 0.8%, and the dimensional changes of the samples in the comparative example were 2.6%. This indicates that the paper bases of the samples in Examples 1-4 are more dimensionally stable, their structures do not collapse under extreme hygrothermal conditions, and their strength is better maintained. Contact angle test: The contact angle of the sample was measured using a water drop contact angle meter. The contact angle of the sample in Example 1 was 112°, the contact angle of the sample in Example 2 was 112°, the contact angle of the sample in Example 1 was 115°, the contact angle of the sample in Example 1 was 114°, and the contact angle of the sample in the comparative example was 91°, indicating that the samples in Examples 1-4 have excellent hydrophobicity and anti-pollution properties, indicating that their surface coatings are dense and have low surface energy.

[0036] Throughout this specification, terms such as "one embodiment," "some embodiments," and "specific embodiments" mean that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the present invention. In this specification, schematic representations of these terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0037] Although the present invention is disclosed as above, the present invention is not limited thereto. Any person skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention should be based on the scope defined by the claims.

Claims

1. A high temperature resistant and anti-aging method for producing lightweight paper-based finishing materials, characterized in that: The anti-aging method comprises the following steps: S100, adding aramid fiber and mica powder to bleached softwood pulp, stirring evenly, and making paper on a screen to obtain a paper base; S200, immersing the paper base in a strengthening solution to obtain an intermediate paper base; S300, coating the protective coating emulsion on the surface of the intermediate paper base to obtain a lightweight paper-based finishing material; Wherein, the reinforcing solution is a melamine-siloxane copolymer solution.

2. The anti-aging method according to claim 1, characterized in that The preparation method of the melamine-siloxane copolymer solution comprises: S201, adding nano-titanium dioxide and a dispersant into ethanol, and uniformly dispersing them under ultrasonic conditions to obtain a nano-titanium dioxide dispersion; S202, mixing the melamine-formaldehyde prepolymer and the modified silicone resin and stirring them uniformly to obtain a mixed resin; S203, adding the nano-titanium dioxide dispersion into the mixed resin to obtain the melamine-siloxane copolymer solution.

3. The anti-aging method according to claim 2, characterized in that: In the S201, the mass ratio of the nano-titanium dioxide, the dispersant and the ethanol is (0.3-0.5): (0.01-0.05): 1; and / or In the S202, the mass ratio of the melamine-formaldehyde prepolymer to the modified silicone resin is (3-4):

1.

4. The anti-aging method according to claim 2, characterized in that: The viscosity of the melamine-siloxane copolymer solution is 100-200 mPa·s.

5. The anti-aging method according to claim 1, characterized in that: In S300, the method for preparing the protective coating emulsion includes: S301, dispersing nano-silicon dioxide in deionized water to obtain a nano-silicon dioxide dispersion; S302, adding the silicone resin solution to the acrylic emulsion and stirring evenly to obtain a silicone resin-acrylic emulsion; S303, adding the nano-silica dispersion, ultraviolet absorber, fluorocarbon additive and auxiliary agent into the silicone resin-acrylic emulsion, stirring evenly, adjusting the viscosity, and obtaining the protective coating emulsion.

6. The anti-aging method according to claim 5, characterized in that: In the above S303, The viscosity is adjusted to 80-150 mPa·s.

7. The enhancement method according to claim 5, characterized in that: In the S301, the mass ratio of the nano-silicon dioxide to the deionized water is (0.1-0.5):1; and / or In the S302, the mass ratio of the silicone resin solution to the acrylic emulsion is 1:(2-3).

8. The anti-aging method according to claim 5, characterized in that: In the above S303, The auxiliary agent includes at least one of a dispersant and a leveling agent or a combination thereof.

9. The anti-aging method according to claim 1, characterized in that: In the S100, The mass ratio of the bleached coniferous wood pulp, the aramid fiber and the mica powder is 1: (0.4-0.5): (0.1-0.2).

10. The anti-aging method according to claim 9, characterized in that: The length of the aramid fiber is 1-3 mm; and / or the particle size of the mica powder is less than 2 μm.