Antibacterial wall cloth as well as preparation method and environment-friendly production equipment thereof

Abstract

The invention is applicable to the field of wall cloth, and provides antibacterial wall cloth which comprises a base material layer, a decorative layer, a functional layer, an adhesive layer and a protective layer, glutinous rice glue is used in the adhesive layer, and the glutinous rice glue comprises the following components in parts by weight: 70-80 parts of glutinous rice starch, 5-10 parts of nano chitin, 2-5 parts of plant polyphenol, 1-2 parts of cellulose ether, 0.5-1 part of glycerol and 0.05-0.1 part of a defoaming agent; the preparation method of the antibacterial wall cloth comprises the steps of base material preparation, base material pretreatment, decoration layer manufacturing, functional layer compounding, adhesive layer treatment, cutting and packaging. Glutinous rice glue is used in the glue layer treatment. The environment-friendly production equipment comprises a formaldehyde purification box, a formaldehyde purification channel, a material spraying plate, a material injection hose and a zeolite molecular sieve net cover, the material injection hose is communicated to the material spraying plate; the injection hose is used for spraying the safe amino acid formaldehyde removal spray onto the antibacterial wall cloth; and a zeolite molecular sieve net is additionally arranged in the zeolite molecular sieve net cover and is used for purifying formaldehyde.

Description

Technical Field

[0001] The present invention relates to the field of wall coverings, and particularly to an antibacterial wall covering, a preparation method thereof, and an environmental protection production device. Background Art

[0002] Wall covering is a material used for interior wall decoration, and its composition is usually composed of multiple layers and different materials compounded together; the glue layer of the wall covering is a key component for pasting the wall covering to the wall, directly affecting the construction convenience, environmental protection, and long-term use stability. The main source of formaldehyde in the wall covering is the glue used in the glue layer. In the prior art, in order to avoid this problem, rice glue is used. Because rice glue (also known as starch glue, plant glue) is an environmental protection adhesive mainly made of natural rice starch, it has the characteristics of non-toxic, odorless, and environmental protection, and is widely used in the pasting of wall coverings and wallpapers.

[0003] However, the wall covering applied with rice glue has problems of mildew and loss of adhesiveness in specific use. Because in humid areas, the starch component in the rice glue provides nutrients for molds; and when the base film is not painted on the wall or the water absorption of the base layer is too strong, the glue liquid is overly absorbed, resulting in insufficient adhesion.

[0004] Therefore, an antibacterial wall covering, a preparation method thereof, and an environmental protection production device are specifically proposed to solve the above problems. Summary of the Invention

[0005] The purpose of the embodiments of the present invention is to provide an antibacterial wall covering, a preparation method thereof, and an environmental protection production device, aiming to solve the problems of mildew and loss of adhesiveness existing in the wall covering applied with rice glue in specific use. Because in humid areas, the starch component in the rice glue provides nutrients for molds; and when the base film is not painted on the wall or the water absorption of the base layer is too strong, the glue liquid is overly absorbed, resulting in insufficient adhesion.

[0006] Specifically: An antibacterial wall cloth, comprising a base material layer, a decorative layer, a functional layer, an adhesive layer and a protective layer. Glutinous rice glue is used in the adhesive layer. The glutinous rice glue comprises the following components in parts by weight: 70-80 parts of glutinous rice starch, 5-10 parts of nano chitin, 2-5 parts of plant polyphenols, 1-2 parts of cellulose ether, 0.5-1 part of glycerol and 0.05-0.1 part of defoamer. After using glutinous rice glue in the antibacterial wall cloth, chitin is processed to the nano level (20-50 nm), greatly improving the specific surface area and reaction activity. At the same time, nano chitin can be directly dispersed in the starch pasting solution by the in-situ precipitation method without complex equipment. Nano chitin serves as an enhanced skeleton, and polyphenols serve as a cross-linking "bridge" to form a three-dimensional network structure with glutinous rice starch, significantly enhancing the bonding strength and water resistance. Chitin, plant polyphenols and glutinous rice starch are all bio-based materials, without synthetic resins or chemical cross-linking agents, without formaldehyde and all-natural. Chitin and plant polyphenols have a synergistic antibacterial effect, can greatly reduce the addition amount of mildew-proof agents, have self-antibacterial properties, and make the antibacterial wall cloth excellent in antibacterial and formaldehyde-free aspects.

[0007] In one embodiment, the glutinous rice glue further comprises a complex of food-grade gelatin and ammonium ferric citrate. The added weight of the complex of food-grade gelatin and ammonium ferric citrate is 4 parts. The complex of food-grade gelatin and ammonium ferric citrate is used to cooperate with the plant polyphenols of tannic acid to achieve Fe 3+ To form coordination bonds with the carboxyl group of gelatin and the pyrogallol group of tannic acid.

[0008] In one embodiment, the glutinous rice glue further comprises sulfonated lignin. The added weight of sulfonated lignin is 6 parts. Sulfonated lignin captures free radicals generated by the aging of the adhesive layer through the phenolic hydroxyl group of lignin to extend the service life and achieve free radical scavenging. Sulfonated lignin improves the dispersibility of chitin and tannic acid in the glue solution through sulfonic acid groups to prevent sedimentation and achieve dispersion stability.

[0009] In one embodiment, the plant polyphenols further comprise tea polyphenols.

[0010] In one embodiment, the weight parts of nano chitin and plant polyphenols in the glutinous rice glue are 8 parts and 3 parts respectively.

[0011] In one embodiment, the process for preparing the above-mentioned glutinous rice glue comprises the following steps: Step 1: Preparation of nano chitin After deacetylating chitin through acid-base treatment, a nano suspension is made by ultrasonic fragmentation or high-pressure homogenization so that the particle size is less than 50 nm. Step 2: Preparation of polyphenol-loaded complex Mix tannic acid with the nano chitin suspension and form a complex by electrostatic adsorption and hydrogen bond action. Step 3: Glue synthesis A. Mix glutinous rice starch with water, heat to 70°C for gelatinization, and sequentially add polyphenol-loaded complex, cellulose ether, and glycerin, and stir until homogeneous; B. Spray-dry to make dry powder glue, or directly package it as wet glue.

[0012] Furthermore, the chitin is a natural polymer extracted from shrimp and crab shells or fungi.

[0013] Another object of the present invention is to provide a preparation method of an antibacterial wall covering, including the following steps: substrate preparation, substrate pretreatment, decorative layer production, functional layer lamination, glue layer treatment, and cutting and packaging; Among them, glutinous rice glue is used in the glue layer treatment.

[0014] Environmentally friendly production equipment, including: Formaldehyde purification box; Formaldehyde purification channel, opened along the main body of the formaldehyde purification box and penetrating the formaldehyde purification box; Two spray plates distributed in parallel, both installed inside the formaldehyde purification channel; a gap is reserved between the two spray plates for passing the produced antibacterial wall covering through; Injection hose, connected to the spray plate; the injection hose is used to introduce the safe amino acid formaldehyde removal spray into the spray plate and then evenly spray it on the antibacterial wall covering in sequence; the safe amino acid formaldehyde removal spray includes the following components by mass percentage: L-lysine%, deionized water%, and ethanol%; Zeolite molecular sieve mesh cover, installed on the side wall of the formaldehyde purification box; a zeolite molecular sieve mesh is installed inside the zeolite molecular sieve mesh cover for purifying formaldehyde.

[0015] Multiple groups of material transfer rollers are installed inside the formaldehyde purification channel, and the multiple groups of material transfer rollers are power-driven and connected to a chain box, and the power of the chain box is provided by a driving motor; the material transfer roller includes a rotating shaft and multiple pressing arc plates distributed around the rotating shaft, and multiple heating wires are laid inside the pressing arc plates.

[0016] Compared with the prior art, the present invention can achieve 1. After using glutinous rice glue, chitin is processed to the nanoscale, significantly enhancing the specific surface area and reactivity. At the same time, nano-chitin can be directly dispersed in the starch gelatinization solution through the in-situ precipitation method without complex equipment. Nano-chitin serves as a reinforcing framework, and polyphenols act as cross-linking "bridges" to form a three-dimensional network structure with glutinous rice starch, significantly improving the bonding strength and water resistance. Chitin, plant polyphenols, and glutinous rice starch are all bio-based materials, without synthetic resins or chemical cross-linking agents, free of formaldehyde and completely natural. Chitin and plant polyphenols have a synergistic antibacterial effect, which can greatly reduce the addition amount of mildew-proof agents and have self-antibacterial properties, making the antibacterial wall covering excellent in terms of antibacterial and formaldehyde-free properties. 2. Since Fe3+ forms coordination bonds with the carboxyl groups of gelatin and the pyrogallol groups of tannic acid, the wet bonding strength of glutinous rice glue is strong. The dynamic coordination bonds reorganize after being compressed and have a high repair rate, possessing self-repairing properties. That is, after adding a complex of food-grade gelatin and ammonium ferric citrate, the durability of the glue layer at 80% humidity is extended, making it suitable for areas with frequent temperature differences. 3. In the glutinous rice starch of glutinous rice glue, adding nano-chitin and tannic acid in a ratio of 8:3 can improve the tensile strength of glutinous rice glue, and the peel strength is increased compared to traditional glutinous rice glue. 4. Sulfonated lignin captures the free radicals generated during the aging of the glue layer through the phenolic hydroxyl groups of lignin, extending the service life and achieving free radical scavenging. Sulfonated lignin improves the dispersibility of chitin and tannic acid in the glue solution through sulfonic acid groups, preventing sedimentation and achieving dispersion stability, making it suitable for high-temperature and high-humidity areas. 5. The produced antibacterial wall covering is fed into the formaldehyde purification channel 3 inside the formaldehyde purification box 2. Two spray plates 7 distributed in parallel continuously spray a safe amino acid formaldehyde removal spray on the antibacterial wall covering. The safe amino acid formaldehyde removal spray comprehensively treats the formaldehyde on the antibacterial wall covering through the L-lysine, deionized water, and ethanol it contains, and at the same time does not corrode or damage the colloid structure, solving the problem of possible formaldehyde residues caused by cross-contamination of equipment or raw materials. 6. After the drive motor 4 is started, it drives a plurality of material transfer rollers 8 to rotate synchronously through the chain box 5. After the material transfer rollers 8 rotate, they act on the antibacterial wall covering through a plurality of pressing arc plates 81 in sequence, realizing creating a suitable temperature for the antibacterial wall covering through a plurality of heating guide wires, so as to release formaldehyde on the premise of ensuring that the quality of the antibacterial wall covering is not affected. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a standard curve graph obtained by detecting a formaldehyde standard solution using a spectrophotometer; Figure 2 It is an annotation graph of Samples 11 - 16 on the standard curve graph obtained by detecting a formaldehyde standard solution using a spectrophotometer; Figure 3Line graph of the peel strength for Experimental Subjects 1 - 8 Figure 4 Structural schematic diagram of the environmental protection production equipment in the present invention Figure 5 For Figure 4 Cross-sectional structural schematic diagram of the environmental protection production equipment in Figure 6 For Figure 5 Structural schematic diagram of the material transfer roller in

[0018] In the attached drawing reference numerals: 1 - Zeolite molecular sieve mesh cover, 2 - Formaldehyde purification box, 3 - Formaldehyde purification channel, 4 - Driving motor, 5 - Chain box, 6 - Injection hose, 7 - Spraying plate, 8 - Material transfer roller; 81 - Pressing arc plate, 82 - Rotating shaft Detailed implementation manners

[0019] In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the attached drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention. The specific implementation of the present invention will be described in detail below with reference to specific embodiments

[0020] Embodiment 1 An antibacterial wall covering, comprising a base material layer, a decorative layer, a functional layer, an adhesive layer and a protective layer. Glutinous rice glue is used in the adhesive layer. The glutinous rice glue comprises the following components in parts by weight: 70 - 80 parts of glutinous rice starch, 5 - 10 parts of nano chitin, 2 - 5 parts of plant polyphenol, 1 - 2 parts of cellulose ether, 0.5 - 1 part of glycerol and 0.05 - 0.1 part of defoaming agent Meanwhile, it is supplementary to note that the defoaming agent can be food-grade and is used to eliminate stirring bubbles; glutinous rice starch is the basic source of viscosity and forms a colloidal matrix after gelatinization; nano chitin is used to enhance mechanical strength, improve tensile property and moisture resistance, and nano-scale dispersion improves the interfacial combination with starch; plant polyphenol is used to crosslink starch and chitin to form a dense network, with natural antibacterial property and reduced usage amount of mildew-proof agent After using glutinous rice glue in the antibacterial wall covering, chitin is processed to the nano-scale (20 - 50 nm), greatly improving the specific surface area and reaction activity. At the same time, nano chitin can be directly dispersed in the starch gelatinization solution by the in-situ precipitation method without complex equipment; nano chitin serves as the reinforcing framework, and polyphenol serves as the crosslinking "bridge" to form a three-dimensional network structure with glutinous rice starch, significantly improving the bonding strength and water resistance; chitin, plant polyphenol and glutinous rice starch are all bio-based materials, without synthetic resin or chemical crosslinking agent, without formaldehyde and all-natural; chitin and plant polyphenol have a synergistic antibacterial effect, can greatly reduce the addition amount of mildew-proof agent, and have self-antibacterial property, making the antibacterial wall covering excellent in antibacterial and formaldehyde-free aspects

[0021] Furthermore: The plant polyphenols also include tea polyphenols.

[0022] The process for preparing the above-mentioned glutinous rice glue includes the following steps: Step 1, Preparation of nano chitin After the chitin is deacetylated by acid-base treatment, it is made into a nano suspension by ultrasonic crushing or high-pressure homogenization, so that the particle size is less than 50 nm; Step 2, Preparation of polyphenol-loaded complex Mix tannic acid with the nano chitin suspension, and form a complex by electrostatic adsorption and hydrogen bond action; Step 3, Glue synthesis A. Mix glutinous rice starch with water, heat to 70 °C for gelatinization, and sequentially add the polyphenol-loaded complex, cellulose ether and glycerin, and stir until uniform; B. Spray-dry to make dry powder glue, or directly package it as wet glue.

[0023] The chitin is a natural polymer extracted from shrimp and crab shells or fungi.

[0024] Example 2 This example is a further elaboration on the basis of Example 1: The glutinous rice glue also includes a complex of food-grade gelatin and ammonium ferric citrate. The added weight of the complex of food-grade gelatin and ammonium ferric citrate is 4 parts. The complex of food-grade gelatin and ammonium ferric citrate is used to cooperate with the plant polyphenols of tannic acid to achieve Fe 3+ To form coordination bonds with the carboxyl group of gelatin and the pyrogallol group of tannic acid.

[0025] Due to the formation of coordination bonds between Fe3+ and the carboxyl group of gelatin and the pyrogallol group of tannic acid, the wet bonding strength of the glutinous rice glue reaches 1.8 N / mm. The dynamic coordination bonds are reorganized after being compressed, and the repair rate exceeds 70%, with self-repairability; that is, after adding 4 parts of the complex of food-grade gelatin and ammonium ferric citrate, the durability of the glue layer at 80% humidity is extended by 2 times, which is suitable for areas with frequent temperature differences.

[0026] Example 3 This example is a further elaboration on the basis of Example 1: The glutinous rice glue also includes sulfonated lignin. The added weight of sulfonated lignin is 6 parts. Sulfonated lignin captures the free radicals generated by the aging of the glue layer through the phenolic hydroxyl group of lignin, which is used to extend the service life and achieve free radical scavenging; Sulfonated lignin improves the dispersibility of chitin and tannic acid in the glue solution through sulfonic acid groups, which is used to prevent sedimentation and achieve dispersion stability.

[0027] Therefore, sulfonated lignin captures free radicals generated by the aging of the adhesive layer through the phenolic hydroxyl groups of lignin, prolongs the service life, and achieves free radical scavenging; sulfonated lignin improves the dispersibility of chitin and tannic acid in the adhesive solution through sulfonic acid groups, prevents sedimentation, and achieves dispersion stability; and is suitable for high-temperature and high-humidity regions.

[0028] Example 4 An antibacterial wall cloth, comprising a base material layer, a decorative layer, a functional layer, an adhesive layer and a protective layer. Glutinous rice glue is used in the adhesive layer, and the glutinous rice glue comprises the following components by weight: 75 parts of glutinous rice starch, 8 parts of nano-chitin, 3 parts of plant polyphenols, 1 part of cellulose ether, 0.8 part of glycerol and 0.07 part of defoaming agent.

[0029] Adding nano-chitin and tannic acid to the glutinous rice starch of the glutinous rice glue in a ratio of 8:3 can increase the tensile strength of the glutinous rice glue by 40%-50%, and the peel strength reaches 1.8-2.2 N / mm (about 1.2-1.5 N / mm for traditional glutinous rice glue).

[0030] Example 5 A preparation method of an antibacterial wall cloth, comprising the following steps: base material preparation, base material pretreatment, decorative layer production, functional layer lamination, adhesive layer treatment and cutting and packaging; Among them, glutinous rice glue is used in the adhesive layer treatment.

[0031] Experimental Example Using the antibacterial wall cloth in Example 1 as Experimental Object 1, the specific glutinous rice glue comprises the following components by weight: 70 parts of glutinous rice starch, 5 parts of nano-chitin, 2 parts of plant polyphenols, 1 part of cellulose ether, 0.5 part of glycerol and 0.05 part of defoaming agent; Using the antibacterial wall cloth in Example 1 as Experimental Object 2, the specific glutinous rice glue comprises the following components by weight: 80 parts of glutinous rice starch, 10 parts of nano-chitin, 5 parts of plant polyphenols, 2 parts of cellulose ether, 1 part of glycerol and 0.1 part of defoaming agent; Using the antibacterial wall cloth in Example 2 as Experimental Object 3, the specific glutinous rice glue comprises the following components by weight: 75 parts of glutinous rice starch, 8 parts of nano-chitin, 3 parts of plant polyphenols, 1 part of cellulose ether, 0.8 part of glycerol, 0.07 part of defoaming agent, and 4 parts of a composite of food-grade gelatin and ammonium ferric citrate; Using the antibacterial wall cloth in Example 3 as Experimental Object 4, the specific glutinous rice glue comprises the following components by weight: 75 parts of glutinous rice starch, 8 parts of nano-chitin, 3 parts of plant polyphenols, 1 part of cellulose ether, 0.8 part of glycerol, 0.07 part of defoaming agent, and 6 parts of sulfonated lignin; Use the antibacterial wall covering in Example 4 as Experimental Subject 5. Specifically, the glutinous rice glue includes the following components by weight: 75 parts of glutinous rice starch, 8 parts of nano-chitin, 3 parts of plant polyphenols, 1 part of cellulose ether, 0.8 part of glycerol, and 0.07 part of defoamer.

[0032] Three antibacterial wall coverings using traditional glutinous rice glue were used as Experimental Subject 6, Experimental Subject 7, and Experimental Subject 8.

[0033] According to GB / T 38794-2020 "Determination of the Release Amount of Formaldehyde, a Chemical Substance in Furniture for Safety", the specific detection method is the phenol reagent spectrophotometry method. The detection environment: temperature 25°C, humidity 50%, atmospheric pressure 101.3 kPa; Apply Experimental Subjects 1-8 to the climate chamber. The sampling time is 20 min, the sampling flow rate is 0.5 L / min, the absorbent solution is phenol reagent solution (10 mL), and the sampling volume is 10 L (0.5 L / min × 20 min); The instruments used are: an air sampler (Lubo LB-2036) and a spectrophotometer (Tianrui Instrument AAS6000); The reagents used are: phenol reagent (meeting the requirements of GB / T 38794-2020), ammonium ferric sulfate color reagent, and formaldehyde standard solution (concentration gradients of 0.0 μg / mL, 0.1 μg / mL, 0.2 μg / mL, 0.4 μg / mL, 0.6 μg / mL).

[0034] Use a spectrophotometer to detect the formaldehyde standard solution (concentration gradients of 0.0 μg / mL, 0.1 μg / mL, 0.2 μg / mL, 0.4 μg / mL, 0.6 μg / mL) to prepare a standard curve for formaldehyde concentration detection. See Figure 1 ; The detailed sampling is as follows: Collect the gas in the climate chamber without applying Experimental Subjects 1-8, named Blank Sample 1 and Blank Sample 2; Collect the gas in the climate chamber without applying Experimental Subject 1, named Sample 1 and Sample 2; Collect the gas in the climate chamber without applying Experimental Subject 2, named Sample 3 and Sample 4; Collect the gas in the climate chamber without applying Experimental Subject 3, named Sample 5 and Sample 6; Collect the gas in the climate chamber without applying Experimental Subject 4, named Sample 7 and Sample 8; Collect the gas in the climate chamber without applying Experimental Subject 5, named Sample 9 and Sample 10; Collect the gas in the climate chamber without applying Experimental Subject 6, named Sample 11 and Sample 12; Collect the gas in the climate chambers of experimental subjects 7 that have not been applied, and name it Sample 13 and Sample 14; Collect the gas in the climate chambers of experimental subjects 8 that have not been applied, and name it Sample 15 and Sample 16; Put Blank Sample 1, Blank Sample 2 and Samples 1 - 16 into a spectrophotometer for detection, and the detection results are as shown in Table 1 below (when the formaldehyde concentration is lower than the method detection limit of "0.01 mg / m³", it is determined as "not detected"): Table 1 Absorbance (A) Formaldehyde concentration (mg / m³) Conclusion Blank sample 1 0.002 Not detected Blank sample 2 0.002 Not detected Sample 1 0.006 Less than 0.01 Not detected Sample 2 0.006 Less than 0.01 Not detected Sample 3 0.005 Less than 0.01 Not detected Sample 4 0.005 Less than 0.01 Not detected Sample 5 0.005 Less than 0.01 Not detected Sample 6 0.006 Less than 0.01 Not detected Sample 7 0.006 Less than 0.01 Not detected Sample 8 0.005 Less than 0.01 Not detected Sample 9 0.004 Less than 0.01 Not detected Sample 10 0.004 Less than 0.01 Not detected Sample 11 0.010 0.040 Sample 12 0.012 0.048 Sample 13 0.012 0.048 Sample 14 0.014 0.056 Sample 15 0.010 0.040 Sample 16 0.012 0.048 From Table 1 and Figure 2 it can be known that: after using glutinous rice glue in the antibacterial wall cloth of the present invention, the formaldehyde concentration is lower than the detection limit of the spectrophotometer (0.01 mg / m³), and is lower than the formaldehyde content limit of the Chinese mandatory standard GB 18583 - 2008 "Limit of harmful substances in interior decoration materials adhesives": ≤0.1 g / kg (i.e., 100 mg / kg). At the same time, the formaldehyde content of the antibacterial wall cloth using glutinous rice glue is lower than that of the antibacterial wall cloth using traditional glutinous rice glue (the reasons for the formaldehyde in traditional glutinous rice glue antibacterial wall cloth are: some manufacturers may add formaldehyde-containing preservatives to extend the shelf life; equipment or raw material cross-contamination may cause trace formaldehyde residues; non-regular manufacturers may mix in cheap chemical glue "urea-formaldehyde resin" to reduce costs, resulting in formaldehyde exceeding the standard); Furthermore, in the present invention, chitin, plant polyphenols and glutinous rice starch are all bio-based materials, without synthetic resins or chemical cross-linking agents, without formaldehyde and all-natural; making the antibacterial wall cloth excellent in terms of no formaldehyde.

[0035] Conduct antibacterial property tests on experimental subjects 1 - 8, specifically referring to GB / T21866 - 2008 "Determination method and antibacterial effect of antibacterial coatings (paint films)"; and, conduct peel strength tests on experimental subjects 1 - 8, specifically referring to the GB / T2790 - 1995 standard; the detailed inspection results are as shown in Table 2 below: Table 2 Antibacterial property Antibacterial persistence Peel strength (mN / mm) Subject 1 100 98 16.8 Subject 2 100 98 16.9 Subject 3 100 98 17.1 Subject 4 100 99 17.2 Subject 5 100 99 17.0 Subject 6 ≥99 ≥95 8.0 Subject 7 ≥99 ≥95 8.2 Subject 8 ≥99 ≥95 8.5 It can be seen from Table 2 that after using glutinous rice glue in the antibacterial wall cloth of the present invention, the antibacterial property, antibacterial persistence and peel strength are far superior to those of the antibacterial wall cloth using traditional glutinous rice glue. Especially in terms of antibacterial property, it reaches a 100% effect and has the effect of preventing mildew; at the same time, combined with Figure 3It can be clearly known that the peeling strength drops sharply from experimental subjects 1 - 5 to experimental subjects 6 - 8; that is, nano-chitin serves as the reinforcing framework, polyphenols serve as the cross-linking "bridges", and form a three-dimensional network structure with glutinous rice starch, significantly improving the bonding strength; chitin, plant polyphenols, and glutinous rice starch are all bio-based materials, without synthetic resins or chemical cross-linking agents, free of formaldehyde and all-natural; chitin and plant polyphenols have a synergistic antibacterial effect, can greatly reduce the addition amount of mildew-proof agents, and have self-antibacterial properties, making the antibacterial wall cloth excellent in terms of antibacterial and formaldehyde-free properties.

[0036] Example 6 Regarding the problem that cross-contamination of equipment or raw materials may lead to formaldehyde residue in the production of existing antibacterial wall cloth; the following technical solutions are proposed: Please refer to Figure 4 and Figure 5 : Environmentally friendly production equipment, including: Formaldehyde purification box 2; Formaldehyde purification channel 3, which is opened along the main body of the formaldehyde purification box 2 and penetrates through the formaldehyde purification box 2; Two spray plates 7 distributed in parallel are both installed inside the formaldehyde purification channel 3; a gap is reserved between the two spray plates 7 for passing the produced antibacterial wall cloth through; Injection hose 6, which is connected to the spray plate 7; the injection hose 6 is used to introduce the safe amino acid formaldehyde removal spray into the inside of the spray plate 7 and then spread and spray it onto the antibacterial wall cloth in sequence; the safe amino acid formaldehyde removal spray includes the following components by mass percentage: 5% L-lysine, 94% deionized water, and 1% ethanol; Zeolite molecular sieve mesh cover 1, which is installed on the side wall of the formaldehyde purification box 2; a zeolite molecular sieve mesh is installed inside the zeolite molecular sieve mesh cover 1 for purifying formaldehyde.

[0037] Therefore, the produced antibacterial wall cloth is passed into the formaldehyde purification channel 3 inside the formaldehyde purification box 2, and two spray plates 7 distributed in parallel are used to continuously spray the safe amino acid formaldehyde removal spray onto the antibacterial wall cloth. The safe amino acid formaldehyde removal spray comprehensively treats the formaldehyde on the antibacterial wall cloth through the L-lysine, deionized water, and ethanol it contains, and at the same time will not corrode and damage the colloid structure; solving the problem that cross-contamination of equipment or raw materials may lead to formaldehyde residue.

[0038] Please refer to Figure 5 and Figure 6: Multiple groups of material transfer rollers 8 are installed inside the formaldehyde purification channel 3. The multiple groups of material transfer rollers 8 are power-driven and connected to the chain box 5, and the power of the chain box 5 is provided by the driving motor 4; the material transfer roller 8 includes a rotating shaft 82 and a plurality of pressing arc plates 81 distributed around the rotating shaft 82, and a plurality of heating wires are laid inside the pressing arc plate 81.

[0039] Therefore, after the driving motor 4 is started, it will drive multiple groups of material transfer rollers 8 to rotate synchronously through the chain box 5. After the material transfer rollers 8 rotate, they will act on the antibacterial wall cloth through a plurality of pressing arc plates 81 in sequence, so as to create a suitable temperature for the antibacterial wall cloth through a plurality of heating wires, so as to release formaldehyde on the basis of ensuring that the quality of the antibacterial wall cloth is not affected.

[0040] In the description of the present invention, unless otherwise specified, the meaning of "a plurality of" is two or more.

[0041] In the description of the present invention, although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An antibacterial wall covering, characterized in that, It includes a base material layer, a decorative layer, a functional layer, an adhesive layer and a protective layer. Glutinous rice glue is used in the adhesive layer. The glutinous rice glue comprises the following components by weight: 70-80 parts of glutinous rice starch, 5-10 parts of nano chitin, 2-5 parts of plant polyphenols, 1-2 parts of cellulose ether, 0.5-1 part of glycerol and 0.05-0.1 part of defoamer.

2. The antibacterial wall fabric according to claim 1, characterized in that, The glutinous rice glue further includes a complex of food-grade gelatin and ammonium ferric citrate, and the added weight part of the complex of food-grade gelatin and ammonium ferric citrate is 4 parts. The complex of food-grade gelatin and ammonium ferric citrate is used to cooperate with the plant polyphenol of tannic acid to achieve Fe 3+ to form coordination bonds with the carboxyl group of gelatin and the pyrogallol group of tannic acid.

3. An antibacterial wall covering according to claim 2, wherein the glutinous rice glue further comprises sulfonated lignin, and the added weight of sulfonated lignin is 6 parts. Sulfonated lignin captures free radicals generated by the aging of the adhesive layer through the phenolic hydroxyl groups of lignin, so as to extend the service life and achieve free radical scavenging; Sulfonated lignin improves the dispersibility of chitin and tannic acid in the glue solution through sulfonic acid groups, so as to prevent sedimentation and achieve dispersion stability.

4. An antibacterial wall covering according to claim 1 or 2, characterized in that, The plant polyphenols further include tea polyphenols.

5. An antibacterial wall covering according to claim 1 or 2, characterized in that, The glutinous rice glue contains 8 parts and 3 parts by weight of nano chitin and plant polyphenols respectively.

6. The antibacterial wall cloth according to claim 2, characterized in that, The process for preparing the above-mentioned glutinous rice glue comprises the following steps: Step 1, preparation of nano chitin After the chitin is deacetylated by acid-base treatment, it is made into a nano suspension by ultrasonic crushing or high-pressure homogenization, so that the particle size is less than 50 nm; Step 2, preparation of polyphenol-loaded composite Tannic acid is mixed with the nano chitin suspension, and a composite is formed by electrostatic adsorption and hydrogen bond interaction; Step 3, synthesis of glue solution A. Mix the glutinous rice starch with water, heat it to 70 °C for gelatinization, and sequentially add the polyphenol-loaded composite, cellulose ether and glycerol, and stir until uniform; B. Spray-dry to make dry glue powder, or directly package it as wet glue.

7. An antibacterial wall covering according to claim 6, characterized in that, The chitin is a natural polymer extracted from shrimp and crab shells or fungi.

8. A preparation method of an antibacterial wall covering, characterized in that, The process for preparing the antibacterial wall covering according to any one of claims 1-7 comprises the following steps: base material preparation, base material pretreatment, decorative layer production, functional layer lamination, adhesive layer treatment and cutting and packaging; Among them, the glutinous rice glue according to any one of claims 1-7 is used in the adhesive layer treatment.

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