PVC (polyvinyl chloride) film structure material with anti-aging and self-cleaning functions

Abstract

The invention belongs to the technical field of functional PVC (polyvinyl chloride) film structure materials, and particularly relates to a PVC film structure material with ageing-resistant and self-cleaning functions. The acrylic acid surface treatment layer and the FEVE finish paint treatment layer are used on the surfaces of the two sides of the PVC film structure material respectively, the self-cleaning performance of the material is improved, the durability of the self-cleaning performance is improved, and the anti-aging performance of the material is excellent.

Description

Technical Field

[0001] The invention belongs to the technical field of functional PVC membrane structural materials, and particularly relates to a PVC membrane structural material with aging resistance and self-cleaning functions. Background Art

[0002] Polyvinyl chloride (PVC) membrane structural material is a film-based composite material made of PVC as the main raw material. This material has been widely used in stadiums, exhibition centers, commercial buildings, storage facilities and other fields due to its light weight, good light transmittance, simple construction and relatively low cost. It is often used in the roof, wall or other structural components of buildings.

[0003] The weather resistance and self-cleaning properties of PVC membrane structural materials are important indicators for measuring their quality and service life. Weather resistance refers to the durability of PVC membrane structural materials in the natural environment, including the ability to resist ultraviolet radiation, temperature changes, humidity, chemical corrosion, etc. Self-cleaning performance refers to the ability of PVC membrane structural materials to prevent dirt from adhering to the surface and to remove surface stains through natural rainfall and other means. The weather resistance of PVC membrane structural materials is usually improved by adding stabilizers such as light stabilizers and antioxidants. Polyvinylidene fluoride (PVDF) has been used as a surface hydrophobic coating due to its low surface energy to improve the self-cleaning function of PVC membrane structural materials. In addition, photocatalysts (such as titanium dioxide, silicon dioxide and zinc oxide) can also be used in the coating. Under the action of ultraviolet rays, photocatalysts can decompose organic dirt.

[0004] Patent CN209063651U provides a multi-layer mesh fabric with self-cleaning properties. It consists of a synthetic fiber fabric layer and two PVC film layers. One of the PVC film layers has a PVDF or acrylic layer, but it lacks double-sided self-cleaning properties. Patent CN203957458U provides a polyester fiber fabric with seven layers of FEVE (fluoroolefin vinyl ether resin) on the outer layer, which results in excessive FEVE usage. However, the effect is still not as good as PTFE membrane.

[0005] Although the weather resistance and self-cleaning properties of PVC membrane structural materials have made significant progress, there are still some defects and shortcomings in practical applications. For example, the self-cleaning effect of the PVDF surface coating under stress stretching is limited and short-lived, usually not exceeding 24 hours. High-pressure water gun washing alone cannot completely rinse away the pollutants, and rags and other cleaning tools are required to wipe away any residue. PVC membrane structural materials are greatly affected by stress winding, and there is a significant difference in the self-cleaning effect between products with stress stretching and those without stress stretching. Nano-titanium dioxide coating materials have poor self-cleaning effects, and the surface needs to be coated with a layer of fluorocarbon surface treatment agent, but good self-cleaning effects cannot be achieved after the coating treatment. When PVDF is used as a coating, since the product itself has no adhesion, a layer of adhesive needs to be attached to fit with PVC, and about 30% of acrylic acid needs to be added during the PVDF processing to improve processing performance, which will affect the overall weather resistance of the product and make the product brittle.

[0006] Therefore, how to improve the weather resistance and self-cleaning performance of PVC membrane structural materials, while taking into account the durability of the functions and reducing the differences caused by stress stretching is still a problem that needs to be solved in this field. Summary of the Invention

[0007] In view of the above technical problems, the purpose of the present invention is to provide a PVC membrane structure material with aging resistance and self-cleaning functions. To achieve the above purpose, the technical solution of the present invention is as follows:

[0008] A PVC membrane structure material with aging resistance and self-cleaning functions, comprising a base fabric layer 4; a first PVC film layer 2, a second PVC film layer 3, a third PVC film layer 5, and a fourth PVC film layer 6 respectively covering the surfaces of both sides of the base fabric layer 4; and a hydrophobic coating coated on the surfaces of the first PVC film layer 2 and the fourth PVC film layer 6; the hydrophobic coating comprises a first hydrophobic coating 7 and a second hydrophobic coating 1; the second hydrophobic coating 1 is an acrylic surface treatment layer, and the second hydrophobic coating 1 is coated on the surface of the first PVC film layer 2; the first hydrophobic coating 7 contains FEVE topcoat, curing agent and diluent, and the weight ratio of the FEVE topcoat, curing agent and diluent is 10:(0.2~10):(2~10); the first hydrophobic coating 7 is coated on the surface of the fourth PVC film layer 6.

[0009] The Chinese name of PVC is polyvinyl chloride, and the Chinese name of FEVE is fluoroolefin-vinyl ether copolymer.

[0010] Preferably, the weight ratio of the FEVE topcoat, curing agent and diluent is one of 10:0.3:10, 10:10:3, 10:3:7, 10:5:7 and 10:7:4.

[0011] Preferably, the diluent is selected from at least one of butyl acetate, ethyl acetate, butanone or toluene.

[0012] Preferably, the curing agent is an isocyanate curing agent. Further preferably, the isocyanate curing agent is selected from at least one of hexamethylene-1,6-diisocyanate, isophorone diisocyanate, and dicyclohexylmethane-4,4-diisocyanate.

[0013] Preferably, the preparation method of the first hydrophobic coating 7 includes the following steps: mixing the FEVE topcoat, curing agent and diluent in a weight ratio of 10: (0.2~10): (2~10), stirring evenly, and standing until the foam disappears, as the slurry of the first hydrophobic coating 7.

[0014] Preferably, the base fabric layer 4 is a polyester fabric layer.

[0015] Preferably, the thickness of each layer of the PVC membrane structure material is as follows: the thickness of the second hydrophobic layer 1 is 0.001mm~0.01mm, the thickness of the first PVC membrane layer 2 is 0.1mm~0.5mm, the thickness of the second PVC membrane layer 3 is 0.1mm~0.5mm, the thickness of the base fabric layer 4 is 0.1mm~0.8mm, the thickness of the third PVC membrane layer 5 is 0.1mm~0.5mm, the thickness of the fourth PVC membrane layer 6 is 0.1mm~0.5mm, and the thickness of the first hydrophobic layer 7 is 0.001mm~0.01mm.

[0016] Preferably, the preparation method of the PVC membrane structure material comprises the following steps:

[0017] The base fabric layer 4 is coated with a scraper in a layered order, so that the first PVC film layer 2 , the second PVC film layer 3 , the third PVC film layer 5 and the fourth PVC film layer 6 are coated on both sides of the base fabric layer 4 .

[0018] Prepare the liquid of the first hydrophobic coating 7, pour the liquid of the first hydrophobic coating 7 into the surface treatment tank, and use the anilox roller to transfer and coat it to the surface of the fourth PVC film layer 6; apply the liquid of the second hydrophobic coating 1 to the surface of the first PVC film layer 2; and roll it up after drying; the anilox roller rotation speed is 5m / min~20m / min, and the surface treatment oven temperature is 100℃~170℃.

[0019] Further preferably, the rotation speed of the anilox roller is 5 m / min to 10 m / min, and the temperature of the anilox roller is room temperature.

[0020] When the PVC membrane structure material is used, the first hydrophobic layer 7 is used as the surface layer and the second hydrophobic layer 1 is used as the bottom layer. The FEVE topcoat used in the first hydrophobic layer 7 is also called trifluoro paint, which is a paint with trifluoro resin FEVE as the main film-forming material and can be cured at room temperature.

[0021] The beneficial effects of the present invention are as follows:

[0022] (1) The durability of the self-cleaning performance of the PVC membrane structure material of the present invention is significantly better than that of the reference product, and is less affected by stress stretching. The difference before and after stress stretching is not obvious, and the self-cleaning effect of products with different degrees of stress stretching is not significantly different.

[0023] (2) The PVC membrane structure material of the present invention has excellent anti-aging performance, which is significantly better than the reference product. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 Schematic diagram of the layered structure of the PVC membrane structural material of the present invention;

[0025] Figure 2 The self-cleaning test results of the product of the present invention at different time points after stress stretching are shown;

[0026] Figure 3 The self-cleaning test results of the reference sample at different time points without stress stretching are shown;

[0027] Figure 4 The self-cleaning test results of the product of the present invention at different time points after stress stretching are shown;

[0028] Figure 5 This is the self-cleaning test effect diagram of the reference sample at different time points after stress stretching;

[0029] Figure 6 is the photoluminescence spectrum of the experimental sample;

[0030] Figure 7 is the photoluminescence spectrum of the reference sample;

[0031] In the figure, 1 is the second hydrophobic coating layer; 2 is the first PVC film layer; 3 is the second PVC film layer; 4 is the base fabric layer; 5 is the third PVC film layer; 6 is the fourth PVC film layer; and 7 is the first hydrophobic coating layer. DETAILED DESCRIPTION

[0032] The present invention will be further described below with reference to specific embodiments. It should be understood that the specific embodiments are only used to explain the present invention and are not used to limit the scope of protection of the present invention.

[0033] In the following examples, the comparative samples and experimental samples were all Figure 1The layered structure shown in the figure has thickness ranges of: second hydrophobic layer 1 has a thickness of 0.001mm to 0.01mm, first PVC film layer 2 has a thickness of 0.1mm to 0.5mm, second PVC film layer 3 has a thickness of 0.1mm to 0.5mm, base fabric layer 4 has a thickness of 0.1mm to 0.8mm, third PVC film layer 5 has a thickness of 0.1mm to 0.5mm, fourth PVC film layer 6 has a thickness of 0.1mm to 0.5mm, and first hydrophobic layer 7 has a thickness of 0.001mm to 0.01mm.

[0034] To ensure the consistency of the comparison, in the embodiment, the thickness of the second hydrophobic layer 1 is 0.002 mm, the thickness of the first PVC film layer 2 is 0.2 mm, the thickness of the second PVC film layer 3 is 0.2 mm, the thickness of the base fabric layer 4 is 0.4 mm, the thickness of the third PVC film layer 5 is 0.2 mm, the thickness of the fourth PVC film layer 6 is 0.2 mm, and the thickness of the first hydrophobic layer 7 is 0.002 mm.

[0035] The base fabric layers 4 were all polyester fabrics of the same source and specifications (Zhejiang Shatler New Materials Co., Ltd.). The first hydrophobic coating 7 of the experimental sample contained a FEVE topcoat, a curing agent, and a diluent; the second hydrophobic coating 1 was an acrylic surface-treated layer. The reference sample had a PVDF-treated first coating 7 and an acrylic surface-treated second coating 1.

[0036] The acrylic surface treatment layer, also known as an acrylic coating or acrylic topcoat, is a conventionally applied coating. For example, see the reference "Jiang Shisheng. Research and Application of Surface Treatment Agents for PVC Architectural Membranes." [C] Annual Meeting of the Modified Plastics Professional Committee of the China Plastics Association and Conference on Technological Achievements of Modified Plastics, Economic and Trade Information Exhibition and Exchange, 2011. While PVDF-modified acrylic coating is employed, the coating process is conventional. PVDF treatment layers are also commonly used as self-cleaning treatments for PVC, as shown in reference CN209063651U.

[0037] In the following examples, FEVE topcoat, acrylic surface treatment agent, and PVDF (polyvinylidene fluoride) surface treatment agent were purchased from Kechuang (Quzhou) Chemical Technology Development Co., Ltd. (A:B weight ratio of 10:1), Ningbo Dekailehua Coating Technology Co., Ltd., and Stahl Fine Coatings (Suzhou) Co., Ltd., respectively. The acrylic surface treatment layer was prepared using acrylic resin and butanone. The preparation method was as follows: acrylic resin and butanone were mixed in a ratio of 1:0.5 by weight and stirred evenly to obtain the acrylic surface treatment layer. The PVDF treatment layer was prepared using PVDF and butanone. The preparation method was as follows: PVDF and butanone were mixed in a ratio of 1:0.5 by weight and stirred evenly.

[0038] However, the liquid formulation and preparation method of the acrylic surface treatment layer belong to conventional techniques in the field. Therefore, in practice, acrylic resin and butanone can be mixed in a weight ratio of 1:(0.01-0.5), and the weight ratio of acrylic resin to butanone is not limited to 1:0.5. The butanone diluent can also be other diluents commonly used in the field.

[0039] Example 1 A PVC membrane structure material and preparation method

[0040] Table 1 Ingredients and anilox roller parameters of the first hydrophobic layer 7 of the experimental sample of PVC membrane structure material

[0041]

[0042] Preparation method: According to the formula in Table 1, FEVE topcoat, curing agent and diluent are mixed, stirred evenly, and allowed to stand until the foam disappears, and this is used as the feed liquid for the first hydrophobic coating 7.

[0043] The base fabric layer 4 is coated with a scraper in a layered order on both sides, so that the first PVC film layer 2 , the second PVC film layer 3 , the third PVC film layer 5 and the fourth PVC film layer 6 are coated on both sides of the base fabric layer 4 .

[0044] The first hydrophobic coating 7 was poured into a surface treatment tank and transferred onto the surface of the fourth PVC film layer 6 using an anilox roller according to the parameters in Table 1. The second hydrophobic coating 1 was then applied to the surface of the first PVC film layer 2. The resulting films were dried and rolled up. Two PVC film structures were obtained, designated Experimental Samples 1 and 2.

[0045] Considering the stress concentration and warping of multi-layer structures, namely, uneven interlayer bonding, more specifically, during the doctor blade coating process, uneven coating thickness or temperature control may lead to inconsistent interlayer bonding, resulting in localized stress concentration. To address this defect, the following steps can be included for the first and fourth PVC film layers:

[0046] Step 1: Real-time stress data acquisition and output of real-time stress data stream.

[0047] Highly sensitive stress sensors (such as strain gauges, fiber optic sensors, or MEMS sensors) are installed at key locations of multi-layer structures on the production line to collect real-time stress data between layers during the production process.

[0048] Specifically, it includes steps 1.1 to 1.5:

[0049] Step 1.1, sensor installation.

[0050] Highly sensitive stress sensors, such as strain gauges and fiber optic sensors, are installed at key locations within the multilayer structure. Real-time stress information, including stress (in Pascals, Pa), strain rate (in 1 / s), and temperature (in degrees Celsius, °C), is measured by the strain gauges and temperature sensors, respectively.

[0051] Step 1.2, sensor connection and configuration

[0052] Connect the installed strain gauges and temperature sensors to the data acquisition system via data cables, and configure the sensor parameters, such as stress measurement range (0-1000 Pa), strain rate sensitivity (0.11 / s / V), and temperature measurement range (-50°C to 150°C).

[0053] Step 1.3, sensor calibration.

[0054] Each sensor is calibrated to ensure the accuracy of the measurement data, that is, calibration is performed using known stress values and temperatures to obtain a calibration coefficient.

[0055] Step 1.4, data sampling.

[0056] The raw signal is acquired from each strain gauge and temperature sensor at a fixed time interval (eg, once per second) to form a raw signal vector.

[0057] Step 1.5, stress data flow generation.

[0058] The original signal is converted into stress value and temperature value to generate stress data stream vector and temperature data stream vector.

[0059] Step 2: Data preprocessing and feature extraction, outputting the preprocessed stress feature data.

[0060] The collected real-time stress data is preprocessed, including filtering, denoising and signal correction, and key features (such as stress peak value, average stress, etc.) are extracted for subsequent analysis.

[0061] Specifically, it includes steps 2.1 to 2.5:

[0062] Step 2.1, data cleaning.

[0063] Clean the real-time stress and temperature data streams to remove outliers and noise.

[0064] Step 2.2, signal filtering.

[0065] A low-pass filter was applied to smooth the cleaned data to reduce high-frequency noise.

[0066] Step 2.3, feature extraction.

[0067] Extract key features such as stress mean, stress peak, and temperature change rate from the filtered stress and temperature data.

[0068] Step 2.4, feature normalization.

[0069] The extracted profit feature data are standardized to ensure that each feature has the same dimension and range.

[0070] Step 2.5, feature selection.

[0071] The most representative features are selected for subsequent stress analysis to generate preprocessed stress feature data.

[0072] Step 3: Stress analysis and state assessment, output stress state assessment results.

[0073] The fuzzy control algorithm is used to analyze the preprocessed stress characteristic data to assess whether the current stress state of the multi-layer structure is within a safe range. The fuzzy control algorithm can handle uncertainty and ambiguity, improving the accuracy of the assessment.

[0074] Specifically, it includes steps 3.1 to 3.5:

[0075] Step 3.1, input stress characteristic data.

[0076] The preprocessed stress characteristic data is input into the stress analysis system for subsequent state assessment.

[0077] In step 3.2, the fuzzy control algorithm is applied to evaluate the stress state according to the stress characteristic data, and a fuzzy rule base is defined to judge the stress state. The expression is:

[0078] State = FuzzyLogic(F selected (t), R)

[0079] Where, F selected (t) is the stress characteristic data at time t, R is the defined fuzzy rule base, which includes rules such as “normal”, “mild stress concentration” and “severe stress concentration”, and FuzzyLogic is the fuzzy control algorithm function.

[0080] Step 3.3, PID (Proportional-Integral-Derivative) control error calculation.

[0081] Calculate the error between the stress state assessment result and the set target.

[0082] Step 3.4, PID controller output.

[0083] Using the PID control algorithm, the control output is calculated based on the error calculated in step 3.3. The expression is:

[0084]

[0085] Where u(t) is the control output at time t, which is used to adjust the production process parameters e(t), K P is the proportional gain constant, range (0,10], K i is the integral gain constant, range (0,5], K d is the differential gain constant, range (0,2], is the integral of the error, is the differential of the error, and e(τ) is the error calculated in step 3.3.

[0086] Step 3.5, stress state assessment results are generated.

[0087] According to the fuzzy evaluation results and PID control output, the EvaluateState evaluation function is combined with fuzzy logic and PID control output to make a comprehensive judgment, and then generate the final stress state evaluation results, including "normal", "mild stress concentration" and "severe stress concentration".

[0088] Step 4: Feedback control decision and output the adjusted production process parameters.

[0089] Based on the stress state assessment results, a PID control algorithm is used to make feedback control decisions. The PID controller calculates the production process parameters that need to be adjusted (such as coating thickness, temperature, pressure, etc.) based on the error between the current stress state and the set target.

[0090] Specifically, it includes steps 4.1 to 4.5:

[0091] Step 4.1: Receive stress state assessment results.

[0092] The stress state evaluation results generated in step 3.5 are input into the feedback control system for subsequent control decisions.

[0093] Step 4.2, calculate the control error.

[0094] The error of the current stress state is calculated based on the set target state. The error is the difference between the set target state and the current stress state.

[0095] Step 4.3, apply the PID control algorithm.

[0096] Use the PID control algorithm to calculate the control output based on the error calculated in step 4.2.

[0097] Step 4.4, determine the adjustment strategy.

[0098] Determine the specific production process parameter adjustment strategy based on the control output, such as adjusting the coating thickness and drying temperature. Take adjusting the coating thickness as an example:

[0099] Δd=k×u(t)

[0100] Where k is the thickness gain factor, determined experimentally, and Δd is the coating thickness adjustment. Adjusting temperature and pressure is similar to the above equation, but with different gain factors.

[0101] Step 4.5, adjust the production process parameters.

[0102] Adjust the coating thickness and drying temperature of the production equipment in real time according to the adjustment strategy output in step 4.4.

[0103] Furthermore, the photoluminescence performance of the hydrophobic coating may be unstable during use. The reasons for this are as follows: UV light-induced coating degradation, i.e., long-term exposure to UV light, can cause photodegradation of the FEVE topcoat and acrylic surface treatment layer, leading to coating color change and performance degradation. In the second embodiment (for ease of testing below, steps S1 to S3 are not performed as the first embodiment), to address this issue, the following steps can also be included:

[0104] Step S1, selecting and preparing a dynamic covalent bond polymer.

[0105] In this example, a polymer with dynamic covalent bonding properties is selected, which can be based on boronate, peptide, or Virgil bonds. In the present invention, boronate polymers are selected because they can break and reconstitute under specific conditions. A boronate polymer solution is dissolved in a suitable solvent (e.g., toluene or butanone).

[0106] Step S2: mixing the polymer solution into the hydrophobic coating.

[0107] More specifically, the dynamic covalent bond polymer solution is evenly mixed into the FEVE topcoat of the first hydrophobic coating and the acrylic surface treatment layer of the second hydrophobic coating to ensure uniform distribution of the polymer in the coating.

[0108] In this example, a dynamic covalent polymer solution is typically incorporated into the FEVE topcoat and acrylic surface treatment layers at a ratio of 5% to 15%, depending on the coating requirements. A stirrer or ultrasonic oscillator is then used to ensure uniform dispersion of the polymer throughout the coating material and prevent polymer agglomeration, as expressed by:

[0109]

[0110] Where C mixis the final concentration of the coating mixture, C P is the concentration of dynamic covalent bond polymer, V P is the concentration of polymer solution, C F is the FEVE topcoat concentration, V F is the volume of FEVE topcoat, C A is the concentration of acrylic acid surface treatment layer, V A Volume of acrylic surface treatment layer.

[0111] Step S3: coating and curing.

[0112] The coating mixture containing the dynamic covalent bond polymer is evenly coated on the surface of the PVC membrane structure material and is cured to form a stable coating.

[0113] In this example, the coating mixture is evenly applied to the surface of the PVC membrane structure material by knife coating, spraying, or transfer. Afterwards, it is initially cured at a controlled temperature (e.g., 100°C to 140°C) and time (e.g., 2 minutes to 10 minutes), and then aged at 30°C to 50°C to ensure the formation and stability of dynamic covalent bonds in the coating, which is expressed as:

[0114] σ(t)=f(T,t)

[0115] Where σ(t) is the stress state of the coating during the curing process, T is the curing temperature, which ranges from 100 to 140°C in the first stage, t is the curing time, which ranges from 2 to 10 minutes, and the second stage ranges from 30°C to 50°C, which ranges from 72h to 168h, and f is the stress function during the curing process to ensure the formation of dynamic covalent bonds.

[0116] Example 2 Performance Test of PVC Membrane Structure Material

[0117] In addition, a reference sample of a PVC membrane structure material was prepared. The difference from the experimental sample 1 of Example 1 was that the first hydrophobic coating 7 of the reference sample was a PVDF treatment layer.

[0118] The difference between the preparation method of the reference sample and that of sample 1 in Example 1 is that the first hydrophobic coating 7 is a PVDF treatment layer and the second hydrophobic coating 1 is an acrylic surface treatment layer.

[0119] Conventional self-cleaning performance tests were performed on the experimental sample (experimental sample 1) and the reference sample at different time points and under different conditions. The test conditions of the reference sample and the experimental sample were consistent (temperature 20° C. and humidity 65%).

[0120] When testing the self-cleaning performance, cut the sample into 8cm*15cm size, spread about 2g of carbon black powder evenly on the sample surface, pour out the excess color powder that is not attached to the sample surface, and place it at room temperature for different lengths of time (immediately, 12, 24, 48, 72 hours). Then rinse it with a high-pressure water gun, first check the color powder residue, and then wipe it with a paper towel to see the presence of pollutants. Typical test results are shown in the figure. Figure 2-Figure 5 .

[0121] Depend on Figures 2 to 5 It can be seen that the PVC membrane structure material of the present invention has good self-cleaning performance, and the durability of the self-cleaning performance is significantly better than that of the reference product. It is less affected by stress stretching, and the self-cleaning effect of different stress stretching degrees has no obvious difference.

[0122] Example 3 Anti-aging performance test of PVC membrane structure material

[0123] The anti-aging properties of the aforementioned experimental samples 1 and 2 and the reference sample were tested using the ASTM G154 Cycle 2 method. The results are shown in Table 2.

[0124] Table 2 Anti-aging performance test results of different experimental samples and reference samples at different time points

[0125]

[0126] As shown in Table 2, the anti-aging performance of the experimental samples at different time points under accelerated conditions is significantly better than that of the reference samples.

[0127] Example 4 Photoluminescence spectrum and absorption spectrum of PVC film

[0128] The photoluminescence spectra and absorption spectra of the sample of the second embodiment and the reference sample (ie, the first embodiment) were tested respectively.

[0129] First, a coating was prepared using a FEVE substrate and a dynamic covalent polymer doping system. This was spin-coated or spray-coated onto a transparent substrate (e.g., quartz glass) to serve as the experimental sample. Next, a reference sample was prepared for comparison. The photoluminescence spectrum was recorded using a 365nm excitation light source.

[0130] Figure 6 、 Figure 7 The photoluminescence spectra of the experimental sample and the reference sample are shown respectively, the horizontal axis represents the wavelength, the vertical axis represents the peak intensity of the photoluminescence, and the third parameter is the UV aging time. The present invention uses an ultraviolet accelerated aging instrument (such as: Xe lamp) for UV irradiation.

[0131] It is not difficult to find that Figure 7The photoluminescence peak in the sample undergoes a significant blue shift, and the fluctuation range of the peak intensity is large, indicating that the stability of the reference sample is far inferior to that of the experimental sample.

[0132] The above embodiments are preferred implementation schemes of the present invention and do not mean that the scope of implementation of the present invention is limited by the above embodiments. Therefore, any other forms, modifications, substitutions, and simplifications produced without departing from the spirit and principles of the present invention are regarded as equivalent replacement methods and are included in the scope of protection of the present invention.

Claims

1. A PVC membrane structure material with aging resistance and self-cleaning functions, comprising a base fabric layer (4); a first PVC membrane layer (2), a second PVC membrane layer (3), a third PVC membrane layer (5), and a fourth PVC membrane layer (6) respectively covering the surfaces of both sides of the base fabric layer (4); and a hydrophobic coating applied on the surfaces of the first PVC membrane layer (2) and the fourth PVC membrane layer (6), characterized in that: The hydrophobic coating comprises a first hydrophobic coating (7) and a second hydrophobic coating (1); the second hydrophobic coating (1) is an acrylic surface treatment layer, and the second hydrophobic coating (1) is coated on the surface of the first PVC film layer (2); the first hydrophobic coating (7) contains FEVE topcoat, curing agent and diluent, and the weight ratio of the FEVE topcoat, curing agent and diluent is 10: (0.2~10): (2~10); the first hydrophobic coating (7) is coated on the surface of the fourth PVC film layer (6).

2. The PVC membrane structure material with aging resistance and self-cleaning function according to claim 1, characterized in that: The weight ratio of the FEVE topcoat, curing agent and diluent is one of 10:0.3:10, 10:10:3, 10:3:7, 10:5:7 and 10:7:

4.

3. The PVC membrane structure material with aging resistance and self-cleaning function according to claim 1, characterized in that: The diluent is selected from at least one of butyl acetate, ethyl acetate, butanone or toluene.

4. The PVC membrane structure material with aging resistance and self-cleaning function according to claim 1, characterized in that: The curing agent is an isocyanate curing agent.

5. The PVC membrane structure material with aging resistance and self-cleaning function according to claim 4, characterized in that: The isocyanate curing agent is selected from at least one of hexamethylene-1,6-diisocyanate, isophorone diisocyanate, and dicyclohexylmethane-4,4-diisocyanate.

6. The PVC membrane structure material with aging resistance and self-cleaning function according to claim 1, characterized in that: The preparation method of the first hydrophobic coating (7) comprises the following steps: mixing FEVE topcoat, curing agent and diluent according to a weight ratio, stirring evenly, and standing until the foam disappears, thereby obtaining a slurry for the first hydrophobic coating (7).

7. The PVC membrane structure material with aging resistance and self-cleaning function according to claim 1, characterized in that: The base fabric layer (4) is a polyester fabric layer.

8. The PVC membrane structure material with aging resistance and self-cleaning function according to claim 1, characterized in that: The thickness of each layer of the PVC membrane structure material is as follows: the thickness of the second hydrophobic layer (1) is 0.001mm~0.01mm, the thickness of the first PVC membrane layer (2) is 0.1mm~0.5mm, the thickness of the second PVC membrane layer (3) is 0.1mm~0.5mm, the thickness of the base fabric layer (4) is 0.1mm~0.8mm, the thickness of the third PVC membrane layer (5) is 0.1mm~0.5mm, the thickness of the fourth PVC membrane layer (6) is 0.1mm~0.5mm, and the thickness of the first hydrophobic layer (7) is 0.001mm~0.01mm.

9. The PVC membrane structure material with aging resistance and self-cleaning function according to claim 1, characterized in that: The preparation method of the PVC membrane structure material comprises the following steps: Scraping and coating are performed on both sides of the base fabric layer (4) in a layered order, so that the first PVC film layer (2), the second PVC film layer (3), the third PVC film layer (5), and the fourth PVC film layer (6) are coated on both sides of the base fabric layer (4); The first hydrophobic coating (7) liquid is prepared, the first hydrophobic coating (7) liquid is poured into a surface treatment tank, and the liquid is transferred and coated on the surface of the fourth PVC film layer (6) using an anilox roller; the second hydrophobic coating (1) liquid is coated on the surface of the first PVC film layer (2); the liquid is rolled up after drying; the anilox roller rotation speed is 5 m / min to 20 m / min, and the surface treatment oven temperature is 100°C to 170°C.

10. The PVC membrane structure material with aging resistance and self-cleaning function according to claim 9, characterized in that: The rotation speed of the anilox roller is 5m / min-10m / min, and the temperature of the anilox roller is room temperature.

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