Redissolvable self-adhesive painting wallpaper and preparation method thereof

Abstract

The invention relates to the technical field of self-adhesive wallpaper, in particular to re-dissolvable self-adhesive painting wallpaper and a preparation method thereof.The re-dissolvable self-adhesive painting wallpaper comprises an adhesive layer, a base material and a surface decoration layer.The adhesive layer is prepared from, by weight, 80-120 parts of polyvinyl alcohol resin, 50-60 parts of cellulose, 1.5-6 parts of a defoaming agent, 10-12 parts of a stabilizing agent, 1-3 parts of 4, 4 '-dihydroxy-4, 4'-dihydroxy-4, 4 '-dihydroxy-4, 4'-dihydroxy-4, 4 '-dihydroxy-4, 4'-dihydroxy-4, 4 '-dihydroxy-4, 7.5 to 9 parts of 2, 5-dichloro-2-octyl-3 (2H)-isothiazolone, and 400 to 500 parts of purified water. The re-dissolvable self-adhesive painted wallpaper has no stickiness after being dried and can recover stickiness after being coated with water, a good adhesion effect can be guaranteed during construction, repeated construction and free movement can be achieved, the re-dissolvable self-adhesive painted wallpaper is provided with back glue, additional glue brushing is not needed, operation is easy and convenient, the construction time and labor cost are greatly saved, and the wallpaper has good application prospects. The problems that existing self-adhesive wallpaper is made of non-setting adhesive materials, in the construction process, the wallpaper is difficult to move and adjust once being pasted, the wall face or paper can be damaged during disassembly, and secondary use is difficult are solved.

Description

Technical Field

[0001] The invention relates to the technical field of self-adhesive wallpapers, in particular to a resolubilizable self-adhesive painted wallpaper and a preparation method thereof. Background Art

[0002] Wallpaper is a wall decoration material with a long history. Its development history is closely linked to the progress of papermaking and printing. With the advancement of technology and changes in market demand, the types and characteristics of wallpaper are constantly enriched and updated. Among them, self-adhesive wallpaper, as an innovative form, has gradually occupied an important position in modern home decoration due to its unique convenience and environmental protection.

[0003] Traditional wallpapers usually need to be pasted with wallpaper glue during installation, which not only increases the difficulty and cost of construction, but also may cause potential harm to the environment and human health due to improper use of glue. The emergence of self-adhesive wallpapers has effectively solved this problem. Self-adhesive wallpapers are coated with a self-adhesive layer on the back of the wallpaper, so that users do not need to apply additional glue during use. They only need to tear off the protective film on the back and directly paste the wallpaper on the wall, which greatly simplifies the construction process and improves construction efficiency.

[0004] However, there are still some urgent problems to be solved in the application of existing self-adhesive wallpaper. First, the self-adhesive layer on the back is difficult to move and adjust once it is pasted, which brings inconvenience to users during use. Once the pasting position deviates or the design needs to be changed, it may cause damage to the wallpaper or the wall, increasing the difficulty and cost of re-construction. Secondly, the existing self-adhesive wallpaper may also cause damage to the wall or the paper itself when it is removed, making the wallpaper unable to be used again, wasting resources.

[0005] Therefore, although the existing self-adhesive wallpaper has the advantages of convenience and environmental protection, there are still some problems in the application process.

[0006] In view of this, the present invention is proposed. Summary of the invention

[0007] The purpose of the present invention is to provide a re-soluble self-adhesive paintable wallpaper and a preparation method thereof. The re-soluble self-adhesive paintable wallpaper is non-sticky after drying and can restore its stickiness after being coated with water. During construction, it can not only ensure a good adhesion effect, but also achieve repeated construction and free movement. It has its own adhesive backing and does not require additional adhesive brushing. The operation is simple and convenient, which greatly saves construction time and labor costs.

[0008] In a first aspect, the present invention provides a resolvable self-adhesive paintable wallpaper, comprising an adhesive layer, a substrate and a surface decorative layer.

[0009] The adhesive layer comprises the following raw materials in parts by weight: 80-120 parts of polyvinyl alcohol resin, 50-60 parts of cellulose, 1.5-6 parts of defoaming agent, 10-12 parts of stabilizer, 7.5-9 parts of 4,5-dichloro-2-octyl-3(2H)-isothiazolone and 400-500 parts of purified water.

[0010] The adhesive layer of the resolubility self-adhesive paintable wallpaper of the present invention mainly comprises polyvinyl alcohol resin, cellulose, defoamer, stabilizer, 4,5-dichloro-2-octyl-3(2H)-isothiazolone and purified water, wherein the polyvinyl alcohol molecular structure contains a large number of hydroxyl groups (-OH), which have strong polarity and can form hydrogen bonds with water molecules. When the polyvinyl alcohol resin is added to water, the hydrogen bonding between water molecules and polyvinyl alcohol molecules allows the polyvinyl alcohol molecules to fully stretch and disperse in the water, and this dispersed state enhances the interaction between the polyvinyl alcohol molecules, thereby showing viscosity. The cellulose molecule contains a large amount of hydroxyl (-OH) hydrophilic groups and complex multi-level structures. When cellulose contacts water, the hydrophilic groups attract and combine water molecules, which can expand the volume of cellulose. At the same time, the ultrastructure of the fiber is relatively loose, providing space for water molecules to enter the internal structure of cellulose, so that water molecules can penetrate into each part of the molecule, and the interaction between molecules increases, thereby enhancing viscosity; cellulose has a higher volume expansion at the same time. When the construction brush is redissolved with water, the volume of the adhesive layer increases instantly, the viscosity increases, the adhesive layer thickens, and the absorption of the wall to the glue is reduced, and the removable and repeatable performance is enhanced. In addition, after high temperature treatment, polyvinyl alcohol dehydration etherification and carbonization cause the molecular structure to change, thereby losing the original solubility and part of the chemical activity, and when the temperature is too high, it will also cause viscosity to decrease, the color turns yellow, and decompose to produce toxic substances ethylene and primary ethers, oligomers. In order to solve this problem, a stabilizer is also added in the adhesive layer of the present invention to reduce the influence of temperature on its performance during product processing and use, thereby improving the stability of the viscosity of the adhesive layer. The defoamer can activate and disperse the polyvinyl alcohol to the greatest extent, thereby fully combining the hydroxyl groups in the polyvinyl alcohol with the water molecules, and promoting the improvement of the viscosity of the adhesive layer. Finally, the adhesive layer of the present invention also contains 4,5-dichloro-2-octyl-3(2H)-isothiazolone antifungal agent, which can effectively kill blue microorganisms, basidiomycetes, black mold, Fusarium, Curvularia, green slime, etc.

[0011] Therefore, the resolvable self-adhesive paint wallpaper of the present invention has the property of being non-sticky after drying and being able to recover stickiness after being coated with water, which can ensure good adhesion effect during construction, and can realize repeated construction and free movement, and has its own adhesive backing, does not need additional adhesive brushing, is simple and convenient to operate, and greatly saves construction time and labor costs. It solves the problem that the existing self-adhesive wallpaper uses self-adhesive materials, which is difficult to move and adjust once pasted during construction, and may damage the wall or the paper itself during removal, resulting in difficulty in secondary use.

[0012] Specifically, the self-adhesiveness of the adhesive layer of the present invention mainly comes from the unique molecular structure and physical properties of polyvinyl alcohol. PVA molecules contain a large amount of hydroxyl groups (-OH), which have strong polarity and can form hydrogen bonds with water molecules and polar groups on solid surfaces. When PVA is dissolved in water, these hydroxyl groups not only form hydrogen bonds with water molecules, making PVA molecules fully stretch and disperse in water, enhancing intermolecular interactions, but also make PVA molecules cross-linked by hydrogen bonds to form a three-dimensional network structure. In addition, the long chain structure of PVA also causes molecules to be easily entangled, further enhancing its viscosity.

[0013] Specifically, the PVA aqueous solution can adhere tightly to the solid surface to form an adsorption film, showing stickiness. At the same time, it can also be adsorbed on the air-water interface, reducing the surface tension and increasing the stability and viscosity of the aqueous solution. This self-adhesiveness enables the PVA adhesive layer to achieve a tight connection between materials without the need for additional adhesives.

[0014] The resolubility of the adhesive layer refers to the ability of the PVA adhesive layer to dissolve again and regain its viscosity when it encounters water again after drying. This ability is mainly due to the stability of the PVA molecular structure and the residual physical cross-linking.

[0015] First, the hydroxyl groups in the PVA molecules do not completely disappear during the drying process. When they come into contact with water again, these hydroxyl groups can quickly form hydrogen bonds with water molecules, causing the PVA molecules to redisperse in the water and show viscosity. At the same time, although the long-chain structure of PVA may shrink and aggregate to a certain extent during the drying process, its structure will not be completely destroyed. When it comes into contact with water again, water molecules can penetrate between the PVA molecules, causing the molecular chains to gradually stretch and disperse, returning to a state similar to that before drying.

[0016] Secondly, the three-dimensional network structure formed by hydrogen bonds between PVA molecules before drying may be partially retained during the drying process. When it encounters water again, these residual physical cross-links can be restored, further enhancing the viscosity of PVA. In addition, the entanglement of PVA molecules still exists after drying. When it encounters water again, this entanglement can maintain the interaction between PVA molecules to a certain extent, making it sticky.

[0017] Therefore, the adhesive layer with PVA as the main component of the present invention not only has good self-adhesiveness and can achieve close connection between materials without the need for additional adhesives, but also has excellent resolubility and can dissolve again and restore viscosity when it encounters water again after drying.

[0018] As a preferred embodiment of the present technical solution, the surface decoration layer includes the following raw materials in parts by weight: 80-120 parts of polyvinyl chloride resin, 55-65 parts of plasticizer, 2-3 parts of hot potassium zinc stabilizer, 40-80 parts of filler stone powder, 15-20 parts of anatase titanium dioxide, 15-20 parts of viscosity reducer and 7-10 parts of foaming agent.

[0019] When preparing the colored surface decoration layer, other pigments and other substances may be added, which are not strictly limited in the present invention.

[0020] As a preferred embodiment of the present invention, the substrate is a non-woven paper substrate, and the gram weight of the substrate is 90-150 g / m 2 , thickness is 0.17-0.30mm, longitudinal tensile strength is not less than 3KN / m, transverse tensile strength is not less than 1.6KN / m, longitudinal wet tensile strength is not less than 1.0KN / m, longitudinal tear strength is not less than 1.2KN / m, transverse tear strength is not less than 1.5KN / m, air permeability is greater than 550cm 3 / min·cm 2 , transverse wet shrinkage rate is no more than 0.8%, water absorption is 20-28g / m 2 .

[0021] The non-woven paper substrate has a unique fiber structure and good water absorption (20-28g / m 2 ), which can effectively absorb and retain moisture and solvents in the adhesive layer, which is crucial for the resolubility of wallpaper during use. When the wallpaper needs to be re-pasted or adjusted, the non-woven paper substrate can quickly absorb moisture and soften the adhesive layer, thereby achieving good resolubility.

[0022] High air permeability of non-woven paper substrate (greater than 550cm 3 / min·cm 2 ) and low lateral moisture shrinkage (no more than 0.8%) help ensure that the substrate remains dimensionally stable and avoids deformation or curling during the wetting and drying process of the wallpaper, thereby maintaining the uniformity and re-dissolution effect of the adhesive layer.

[0023] The non-woven paper substrate has high longitudinal and transverse tensile strength (not less than 3KN / m and 1.6KN / m respectively), as well as good longitudinal and transverse tear resistance (not less than 1.2KN / m and 1.5KN / m respectively). These characteristics enable the wallpaper to maintain structural integrity and stability during pasting and use, and is not easy to tear or break, thereby ensuring that the adhesive layer can adhere tightly to the wall or other base surface and achieve good self-adhesion.

[0024] Finally, the appropriate thickness (0.17-0.30mm) and weight (90-150g / m 2 ) makes the non-woven paper substrate have sufficient strength while remaining light, thin and soft, which is convenient for construction and wall bonding, and also helps the adhesive layer to be evenly distributed and effectively adhered to the substrate.

[0025] Therefore, the non-woven paper substrate of the present invention which selects the above parameters can not only ensure the dimensional stability and structural integrity of the wallpaper during wetting and drying, but also promote the effective adhesion of the adhesive layer, thereby achieving good pasting effect and reusability of the wallpaper.

[0026] In a second aspect, the present invention also provides a method for preparing the above-mentioned resolubility self-adhesive paintable wallpaper, which specifically comprises the following steps:

[0027] S1, coating the coating of the adhesive layer on the back of the substrate, and sequentially drying, curing and rolling to obtain a substrate with an adhesive layer coated on the back;

[0028] S2, printing a surface decoration layer on the upper surface of the substrate by screen printing, and obtaining a resolubilized self-adhesive paint wallpaper after drying and cooling;

[0029] During the drying and curing, a five-zone oven with an upper and lower air outlet structure is used for drying and curing, the temperature of the oven in zone one is 150-160°C, the temperature of the oven in zone two is 170-180°C, the temperature of the oven in zone three is 180-190°C, the temperature of the oven in zone four is 190-200°C, and the temperature of the oven in zone five is 200-210°C.

[0030] In the preparation method of the resolvable self-adhesive brush-painted wallpaper of the present invention, the coating of the adhesive layer is firstly coated on the back of the substrate to obtain the substrate with the adhesive layer coated on the back, and then the surface decorative layer is printed on the upper surface of the substrate by screen printing to obtain the resolvable self-adhesive brush-painted wallpaper. Among them, the drying and curing procedure of the adhesive layer has a significant effect on the self-adhesiveness and resolubility of the final wallpaper. Therefore, the present invention proposes to use a five-zone oven with an upper and lower air outlet structure for drying and curing, and further through a specific temperature gradient, ensure that the adhesive layer is fully cured and forms good performance, thereby improving the self-adhesiveness and resolubility of the wallpaper.

[0031] Specifically, during the drying and curing process of the present invention, the solvent in the adhesive layer will gradually evaporate, and the resin and additives will form a stable structure. The drying and curing temperature and time of the present invention can ensure that the adhesive layer is fully cured to form a tough and elastic film, thereby enhancing the self-adhesiveness of the wallpaper. The setting of the temperature gradient in the drying and curing procedure of the present invention helps the adhesive layer to be gradually dehydrated and cured, avoiding the degradation of the adhesive layer performance caused by too fast or too slow curing speed. The adhesive layer that has been fully dried and cured can form a stronger adhesion with the substrate and the wall surface, ensuring that the wallpaper is not easy to fall off or warp during use. Appropriate drying and curing conditions can also improve the heat resistance and moisture resistance of the adhesive layer, further enhancing the self-adhesiveness of the wallpaper.

[0032] In addition, high temperature helps the solvent in the adhesive layer to fully evaporate and reduce solvent residue. Low solvent residue can ensure that the wallpaper can quickly absorb water and soften the adhesive layer during redissolution, thereby achieving good redissolution. If the drying and curing are not sufficient, more solvent may remain in the adhesive layer, causing the wallpaper to absorb water more slowly during redissolution, or even fail to completely soften the adhesive layer, affecting the redissolution effect. The adhesive layer that has been properly dried and cured has a more stable structure and is not easily affected by the external environment. This helps to ensure that the redissolution of the wallpaper can remain consistent during long-term storage or use. The stable adhesive layer can also reduce the problems of adhesion and deformation that may occur in the wallpaper during the redissolution process, and improve the use effect after redissolution.

[0033] As a preferred embodiment of the present technical solution, in step S1, when preparing the coating for the adhesive layer, the raw materials are added in corresponding weight portions in the order of liquid first and powder later, first stirred at a speed of 600-800 rpm for 20-40 min, and then stirred at a speed of 1000-1200 rpm for 20-40 min to fully improve the dispersion effect of each raw material, and finally the obtained coating is placed at room temperature for 20-30 hours.

[0034] As a preferred embodiment of the present technical solution, in step S1, the coating thickness of the adhesive layer is 0.20-0.30 mm, wherein the angle of the scraper is 50-60°, the pressure is 3-5 MPa, and the vehicle speed is 15-20 m / min.

[0035] As a preferred embodiment of the present technical solution, in step S2, when preparing the coating for the surface decoration layer, the raw materials in corresponding parts by weight are added in the order of plasticizer, hot potassium zinc stabilizer, viscosity reducer, anatase titanium dioxide, foaming agent, polyvinyl chloride resin and filler stone powder, first stirred at a speed of 400-500rpm for 10-15min, then stirred at a speed of 500-600rpm for 5-10min, and finally the viscosity of the surface decoration layer coating is adjusted to 10000CP-20000CP at 25-30°C by the viscosity reducer.

[0036] Among them, when adjusting the viscosity, add the viscosity reducer in small amounts and multiple times to dilute it to prevent excessive addition of the viscosity reducer, which will cause the viscosity to be too low and fail to meet the process requirements; when preparing color paste, try to use a small amount of plasticizer to clean the pigment container to prevent the viscosity from being too low.

[0037] As a preferred embodiment of the present technical solution, in step S2, the coating of the decorative surface layer is pumped into the screen mold using a vacuum diaphragm pump, and printing is performed using the basic principle that the mesh holes of the graphic part of the screen printing plate are ink-permeable, while the mesh holes of the non-graphic part are ink-impermeable; then the pressure of the scraper on the screen printing plate is adjusted, and the printed material is squeezed from the mesh holes of the graphic part onto the substrate by the scraper, and is dried, cooled, and rolled into a finished product.

[0038] As a preferred embodiment of the present technical solution, in step S2, during screen printing, the printing temperature is 160-180°C and the vehicle speed is 25-35m / min.

[0039] As a preferred embodiment of the present technical solution, in step S2, during the drying, the temperature is controlled to be 200-205° C. and the time is 51-72 seconds.

[0040] The resolvable self-adhesive paintable wallpaper of the present invention has at least the following beneficial effects:

[0041] 1. The resolubility self-adhesive paintable wallpaper of the present invention comprises an adhesive layer, a substrate and a surface decorative layer, wherein the adhesive layer comprises the following raw materials: polyvinyl alcohol resin, cellulose, a defoamer, a stabilizer, 4,5-dichloro-2-octyl-3(2H)-isothiazolone and purified water. In the adhesive layer, the molecular structure of polyvinyl alcohol contains a large number of hydroxyl groups (-OH), which have strong polarity and can form hydrogen bonds with water molecules. When polyvinyl alcohol resin is added to water, the hydrogen bonding between water molecules and polyvinyl alcohol molecules allows the polyvinyl alcohol molecules to fully stretch and disperse in the water. This dispersed state enhances the interaction between polyvinyl alcohol molecules, thereby showing viscosity. The cellulose molecule contains a large number of hydroxyl (-OH) hydrophilic groups and a complex multi-level structure. When cellulose contacts water, the hydrophilic groups will attract and bind water molecules, which will expand the volume of cellulose. At the same time, the ultrastructure of the fiber is relatively loose, providing space for water molecules to enter the internal structure of cellulose, so that water molecules can penetrate into various parts of the molecule, and the interaction between molecules increases, thereby enhancing viscosity; at the same time, cellulose has a high volume expansion, and when it is re-dissolved by brushing water during construction, the volume of the adhesive layer increases instantly, the viscosity increases, the adhesive layer becomes thicker, and the absorption of the wall to the adhesive is reduced, and the movable and repeatable performance is enhanced. In addition, the adhesive layer of the present invention also includes a defoamer, a stabilizer and a 4,5-dichloro-2-octyl-3 (2H)-isothiazolone mildew inhibitor to further improve the stability of the adhesive layer. Therefore, the resolvable self-adhesive paint wallpaper of the present invention is non-sticky after drying and can recover its stickiness after being coated with water, which can ensure good adhesion effect during construction and realize repeated construction and free movement. It has its own adhesive backing and does not need additional adhesive brushing, which is simple and convenient to operate, greatly saving construction time and labor costs, and solving the problem that the existing self-adhesive wallpaper uses self-adhesive materials, which is difficult to move and adjust once pasted during construction, and may damage the wall or the paper itself during removal, resulting in difficulty in secondary use;

[0042] 2. The resolvable self-adhesive paint wallpaper of the present invention can be easily peeled off from the wall without causing serious damage to the wall or leaving a large amount of glue marks, which is convenient for re-decoration and decoration of the wall;

[0043] 3. The resolvable self-adhesive paint wallpaper of the present invention is made of environmentally friendly materials, which meets the modern people's demand for environmentally friendly decoration materials, and no traditional glue is needed in the pasting process, thus avoiding the release of harmful substances such as formaldehyde that may be caused by glue;

[0044] 4. The resolvable self-adhesive painted wallpaper of the present invention can be recycled and reused after being discarded, thereby reducing environmental pollution and waste of resources;

[0045] 5. The surface decorative layer of the resolvable self-adhesive paint wallpaper of the present invention has a variety of colors, patterns and textures to choose from, which can meet the personalized needs of different consumers and the matching of various decoration styles;

[0046] 6. The resolvable self-adhesive paintable wallpaper of the present invention is easy to install and can be installed by ordinary people by themselves. While saving costs, it brings users a convenient, beautiful, durable and creative experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0048] Figure 1 The present invention is a structural schematic diagram of the resolubility self-adhesive paintable wallpaper.

[0049] Description of reference numerals:

[0050] 1. Surface decoration layer; 2. Base material; 3: Adhesive layer. DETAILED DESCRIPTION

[0051] It should be noted that the following detailed descriptions are illustrative and are intended to provide further explanation of the present application. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present application belongs.

[0052] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form also includes the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this description, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0053] The technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0054] Example 1

[0055] In this embodiment, the adhesive layer includes the following raw materials in parts by weight: 100 parts of polyvinyl alcohol resin, 55 parts of cellulose, 4 parts of defoaming agent, 11 parts of stabilizer, 8 parts of 4,5-dichloro-2-octyl-3(2H)-isothiazolone and 450 parts of water.

[0056] The preparation method of the adhesive layer coating in this embodiment is as follows:

[0057] Weigh the above materials according to the weight ratio, add the corresponding weight portions of raw materials in the order of adding liquid first and then powder, stir at 600 rpm for 20-40 minutes, then stir at 1000 rpm for 20-40 minutes, and let stand at room temperature for 20-30 hours for use.

[0058] The gram weight of the nonwoven paper substrate in this embodiment is 90-150 g / m 2 , thickness is 0.17-0.30mm, longitudinal tensile strength is not less than 3KN / m, transverse tensile strength is not less than 1.6KN / m, longitudinal wet tensile strength is not less than 1.0KN / m, longitudinal tear strength is not less than 1.2KN / m, transverse tear strength is not less than 1.5KN / m, air permeability is greater than 550cm 3 / min·cm 2 , transverse wet shrinkage rate is no more than 0.8%, water absorption is 20-28g / m 2 .

[0059] In this embodiment, the surface decoration layer includes the following raw materials in parts by weight: 100 parts of polyvinyl chloride resin, 60 parts of plasticizer, 3 parts of hot potassium zinc stabilizer, 60 parts of filler stone powder, 20 parts of anatase titanium dioxide, 20 parts of viscosity reducer and 8 parts of foaming agent.

[0060] The preparation method of the surface decorative layer coating of this embodiment is as follows:

[0061] Accurately weigh various raw materials to meet the requirements of the formula and keep the process uniform and uniform, divided into liquid metering / powder metering;

[0062] Add the corresponding weight portions of raw materials in the order of plasticizer, hot potassium zinc stabilizer, viscosity reducer, anatase titanium dioxide, foaming agent, polyvinyl chloride resin and filler stone powder, stir at 400 rpm for 10-15 min, and then stir at 500 rpm for 5-10 min;

[0063] Release a cup of paste from the sampling valve, measure the paste temperature with a thermometer, and measure the viscosity with a rotary viscometer (usually use No. 4 rotor, 60 rpm, unless otherwise required). If the viscosity is high, add an appropriate amount of viscosity reducer to adjust it to the viscosity required by the process, measure the paste temperature at the same time, keep process records, and finally adjust the viscosity of the surface decorative layer coating to 10000cp at 30°C.

[0064] Notice:

[0065] (1) When adjusting the viscosity, add a viscosity reducer in small amounts and multiple times to dilute it to prevent excessive addition of the viscosity reducer, which will result in too low a viscosity and fail to meet the process requirements;

[0066] (2) Check, clean and replace the filter screen regularly;

[0067] (3) Adjust the gate during grinding to ensure that there is no material breakage or overflow between the first and second rollers;

[0068] (4) When preparing the color paste, try to use a small amount of plasticizer to clean the pigment container to prevent the viscosity from being reduced too low. The preparation method of the resolubility self-adhesive paint wallpaper in this embodiment includes the following steps:

[0069] S1. Apply the coating of the adhesive layer on the back of the substrate, and control the angle of the scraper to 50°, the pressure to 3Mpa, and the speed to 15-20m / min, so that the final coating thickness of the adhesive layer is 0.2mm, and then use a five-zone oven with an upper and lower air outlet structure for drying and curing. The temperature of the first zone oven is 150-160°C, the temperature of the second zone oven is 170-180°C, the temperature of the third zone oven is 180-190°C, the temperature of the fourth zone oven is 190-200°C, and the temperature of the fifth zone oven is 200-210°C. After the smooth surface roller is pressed, it is cooled and rolled up to obtain a substrate with an adhesive layer coated on the back;

[0070] S2. The coating of the decorative surface layer is pumped into the screen mold by a vacuum diaphragm pump, and the pressure of the scraper on the screen printing plate is adjusted. The printed material is squeezed from the mesh of the graphic part to the substrate by the scraper. The printing temperature is 160°C and the speed is 25-35m / min. The material is then dried at 200°C for 72 seconds and finally cooled and rolled into a finished product to obtain a re-soluble self-adhesive paint wallpaper.

[0071] Example 2

[0072] In this embodiment, the adhesive layer includes the following raw materials in parts by weight: 80 parts of polyvinyl alcohol resin, 50 parts of cellulose, 1.5 parts of defoaming agent, 10 parts of stabilizer, 7.5 parts of 4,5-dichloro-2-octyl-3(2H)-isothiazolone and 400 parts of water.

[0073] The gram weight of the nonwoven paper substrate in this embodiment is 90-150 g / m 2 , thickness is 0.17-0.30mm, longitudinal tensile strength is not less than 3KN / m, transverse tensile strength is not less than 1.6KN / m, longitudinal wet tensile strength is not less than 1.0KN / m, longitudinal tear strength is not less than 1.2KN / m, transverse tear strength is not less than 1.5KN / m, air permeability is greater than 550cm 3 / min·cm 2, transverse wet shrinkage rate is no more than 0.8%, water absorption is 20-28g / m 2 .

[0074] In this embodiment, the surface decoration layer includes the following raw materials in parts by weight: 80 parts of polyvinyl chloride resin, 55 parts of plasticizer, 2 parts of hot potassium zinc stabilizer, 40 parts of filler stone powder, 15 parts of anatase titanium dioxide, 15 parts of viscosity reducer and 7 parts of foaming agent.

[0075] The method for preparing the resolubility-reinforced self-adhesive paintable wallpaper in this embodiment comprises the following steps:

[0076] S1. Apply the coating of the adhesive layer on the back of the substrate, and control the angle of the scraper to 55°, the pressure to 5Mpa, and the speed to 15-20m / min, so that the final coating thickness of the adhesive layer is 0.3mm, and then use a five-zone oven with an upper and lower air outlet structure for drying and curing. The temperature of the first zone oven is 150-160°C, the temperature of the second zone oven is 170-180°C, the temperature of the third zone oven is 180-190°C, the temperature of the fourth zone oven is 190-200°C, and the temperature of the fifth zone oven is 200-210°C. After the smooth surface roller is pressed, it is cooled and rolled up to obtain a substrate with an adhesive layer coated on the back;

[0077] S2. The coating of the decorative surface layer is pumped into the screen mold by a vacuum diaphragm pump, and the pressure of the scraper on the screen printing plate is adjusted. The printed material is squeezed from the mesh of the graphic part to the substrate by the scraper. The printing temperature is 180°C and the speed is 25-35m / min. The material is then dried at 205°C for 51 seconds and finally cooled and rolled into a finished product to obtain a re-soluble self-adhesive paint wallpaper.

[0078] Example 3

[0079] In this embodiment, the adhesive layer includes the following raw materials in parts by weight: 120 parts of polyvinyl alcohol resin, 60 parts of cellulose, 6 parts of defoaming agent, 12 parts of stabilizer, 9 parts of 4,5-dichloro-2-octyl-3(2H)-isothiazolone and 500 parts of water.

[0080] The gram weight of the nonwoven paper substrate in this embodiment is 90-150 g / m 2 , thickness is 0.17-0.30mm, longitudinal tensile strength is not less than 3KN / m, transverse tensile strength is not less than 1.6KN / m, longitudinal wet tensile strength is not less than 1.0KN / m, longitudinal tear strength is not less than 1.2KN / m, transverse tear strength is not less than 1.5KN / m, air permeability is greater than 550cm 3 / min·cm 2 , transverse wet shrinkage rate is no more than 0.8%, water absorption is 20-28g / m 2 .

[0081] In this embodiment, the surface decoration layer includes the following raw materials in parts by weight: 120 parts of polyvinyl chloride resin, 65 parts of plasticizer, 3 parts of hot potassium zinc stabilizer, 80 parts of filler stone powder, 20 parts of anatase titanium dioxide, 20 parts of viscosity reducer and 10 parts of foaming agent.

[0082] The method for preparing the resolubility-reinforced self-adhesive paintable wallpaper in this embodiment comprises the following steps:

[0083] S1. Apply the coating of the adhesive layer on the back of the substrate, and control the angle of the scraper to 55°, the pressure to 4Mpa, and the speed to 15-20m / min, so that the final coating thickness of the adhesive layer is 0.25mm, and then use a five-zone oven with an upper and lower air outlet structure for drying and curing. The temperature of the first zone oven is 150-160°C, the temperature of the second zone oven is 170-180°C, the temperature of the third zone oven is 180-190°C, the temperature of the fourth zone oven is 190-200°C, and the temperature of the fifth zone oven is 200-210°C. After the smooth surface roller is pressed, it is cooled and rolled up to obtain a substrate with an adhesive layer coated on the back;

[0084] S2. The coating of the decorative surface layer is pumped into the screen mold by a vacuum diaphragm pump, and the pressure of the scraper on the screen printing plate is adjusted. The printed material is squeezed from the mesh of the graphic part to the substrate by the scraper. The printing temperature is 170°C and the speed is 25-35m / min. The material is then dried at 205°C for 60 seconds and finally cooled and rolled into a finished product to obtain a re-soluble self-adhesive paint wallpaper.

[0085] Example 4

[0086] In this embodiment, the adhesive layer includes the following raw materials in parts by weight: 100 parts of polyvinyl alcohol resin, 60 parts of cellulose, 6 parts of defoaming agent, 12 parts of stabilizer, 8 parts of 4,5-dichloro-2-octyl-3(2H)-isothiazolone and 500 parts of water.

[0087] The gram weight of the nonwoven paper substrate in this embodiment is 90-150 g / m 2 , thickness is 0.17-0.30mm, longitudinal tensile strength is not less than 3KN / m, transverse tensile strength is not less than 1.6KN / m, longitudinal wet tensile strength is not less than 1.0KN / m, longitudinal tear strength is not less than 1.2KN / m, transverse tear strength is not less than 1.5KN / m, air permeability is greater than 550cm 3 / min·cm 2 , transverse wet shrinkage rate is no more than 0.8%, water absorption is 20-28g / m 2 .

[0088] In this embodiment, the surface decoration layer includes the following raw materials in parts by weight: 100 parts of polyvinyl chloride resin, 65 parts of plasticizer, 3 parts of hot potassium zinc stabilizer, 70 parts of filler stone powder, 20 parts of anatase titanium dioxide, 20 parts of viscosity reducer and 10 parts of foaming agent.

[0089] The method for preparing the resolubility-reinforced self-adhesive paintable wallpaper in this embodiment comprises the following steps:

[0090] S1. Apply the coating of the adhesive layer on the back of the substrate, and control the angle of the scraper to 55°, the pressure to 4Mpa, and the speed to 15-20m / min, so that the final coating thickness of the adhesive layer is 0.25mm, and then use a five-zone oven with an upper and lower air outlet structure for drying and curing. The temperature of the first zone oven is 150-160°C, the temperature of the second zone oven is 170-180°C, the temperature of the third zone oven is 180-190°C, the temperature of the fourth zone oven is 190-200°C, and the temperature of the fifth zone oven is 200-210°C. After the smooth surface roller is pressed, it is cooled and rolled up to obtain a substrate with an adhesive layer coated on the back;

[0091] S2. The coating of the decorative surface layer is pumped into the screen mold by a vacuum diaphragm pump, and the pressure of the scraper on the screen printing plate is adjusted. The printed material is squeezed from the mesh of the graphic part to the substrate by the scraper. The printing temperature is 170°C and the vehicle speed is 25-35m / min. The product is then dried at 205°C for 65 seconds and finally cooled and rolled into a finished product to obtain a re-soluble self-adhesive paint wallpaper.

[0092] Comparative Example 1

[0093] This comparative example is substantially the same as Example 1, except that:

[0094] The adhesive layer in this comparative example includes the following raw materials in parts by weight: 100 parts of polyvinyl alcohol resin, 4 parts of defoaming agent, 11 parts of stabilizer, 8 parts of 4,5-dichloro-2-octyl-3(2H)-isothiazolone and 450 parts of water.

[0095] Comparative Example 2

[0096] This comparative example is substantially the same as Example 1, except that:

[0097] The adhesive layer in this comparative example includes the following raw materials in parts by weight: 55 parts of cellulose, 4 parts of defoaming agent, 11 parts of stabilizer, 8 parts of 4,5-dichloro-2-octyl-3(2H)-isothiazolone and 450 parts of water.

[0098] Comparative Example 3

[0099] This comparative example is substantially the same as Example 1, except that:

[0100] The adhesive layer in this comparative example includes the following raw materials in parts by weight: 100 parts of polyvinyl alcohol resin, 55 parts of konjac flour, 4 parts of defoaming agent, 11 parts of stabilizer, 8 parts of 4,5-dichloro-2-octyl-3(2H)-isothiazolone and 450 parts of water.

[0101] Figure 1 The present invention is a structural schematic diagram of the resolubility self-adhesive paintable wallpaper.

[0102] In order to study the viscosity and solubility of the wallpapers prepared in the above embodiments and control examples, the present invention tested the peeling force between the wallpapers in embodiment 1 and control examples 1-3 and the cement wall. The test results are shown in Table 1.

[0103] Table 1 Test results (peel force unit is N / 25mm)

[0104]

[0105] It can be seen from the data in Table 1 that the resolubility-resistant self-adhesive paintable wallpaper of the present invention has excellent resolubility and self-adhesion, and can ensure good adhesion effect during construction while achieving repeated construction and free movement.

[0106] Although polyvinyl alcohol resin containing a large number of hydroxyl groups is used in the adhesive layer of Control Example 1, cellulose with high volume expansion is not added, resulting in a thin adhesive layer, which makes it difficult to stick or the firmness of the adhesive after sticking is poor, resulting in seam peeling.

[0107] Although the cellulose in the adhesive layer of Control Example 2 also contains a large number of hydroxyl hydrophilic groups, it also includes a complex multi-level structure, resulting in poor redissolubility of the adhesive layer.

[0108] In the adhesive layer of Control Example 3, konjac flour is used instead of cellulose and compounded with polyvinyl alcohol resin. Although konjac flour also has water absorption and swelling properties, which increases the volume of the adhesive layer, the konjac flour absorbs water too slowly, and the volume expansion of the adhesive layer is not timely. It takes a long time to completely dissolve after applying water, which affects the construction progress. Therefore, the wallpaper prepared in Control Example 3 has poor redissolution effect and self-adhesive effect.

[0109] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A resolvable self-adhesive paintable wallpaper, characterized in that: It includes adhesive layer, substrate and surface decoration layer. The adhesive layer comprises the following raw materials in parts by weight: 80-120 parts of polyvinyl alcohol resin, 50-60 parts of cellulose, 1.5-6 parts of defoaming agent, 10-12 parts of stabilizer, 7.5-9 parts of 4,5-dichloro-2-octyl-3(2H)-isothiazolone and 400-500 parts of purified water.

2. The resolubilizable self-adhesive paintable wallpaper according to claim 1, characterized in that: The surface decoration layer comprises the following raw materials in parts by weight: 80-120 parts of polyvinyl chloride resin, 55-65 parts of plasticizer, 2-3 parts of hot potassium zinc stabilizer, 40-80 parts of filler stone powder, 15-20 parts of anatase titanium dioxide, 15-20 parts of viscosity reducer and 7-10 parts of foaming agent.

3. The resolubilizable self-adhesive paintable wallpaper according to claim 1, characterized in that: The substrate is a non-woven paper substrate, and the gram weight of the substrate is 90-150 g / m 2 , thickness is 0.17-0.30mm, longitudinal tensile strength is not less than 3KN / m, transverse tensile strength is not less than 1.6KN / m, longitudinal wet tensile strength is not less than 1.0KN / m, longitudinal tear strength is not less than 1.2KN / m, transverse tear strength is not less than 1.5KN / m, air permeability is greater than 550cm 3 / min·cm 2 , transverse wet shrinkage rate is no more than 0.8%, water absorption is 20-28g / m 2 .

4. The method for preparing the resolubility self-adhesive paintable wallpaper according to any one of claims 1 to 3, characterized in that: The following steps are involved: S1, coating the coating of the adhesive layer on the back of the substrate, and sequentially drying, curing and rolling to obtain a substrate with an adhesive layer coated on the back; S2, printing a surface decoration layer on the upper surface of the substrate by screen printing, and obtaining a resolubilized self-adhesive paint wallpaper after drying and cooling; During the drying and curing, a five-zone oven with an upper and lower air outlet structure is used for drying and curing, the temperature of the oven in zone one is 150-160°C, the temperature of the oven in zone two is 170-180°C, the temperature of the oven in zone three is 180-190°C, the temperature of the oven in zone four is 190-200°C, and the temperature of the oven in zone five is 200-210°C.

5. The preparation method according to claim 4, characterized in that: In step S1, when preparing the coating of the adhesive layer, the raw materials of corresponding weight parts are added in the order of liquid first and powder later, first stirred at 600-800 rpm for 20-40 min, then stirred at 1000-1200 rpm for 20-40 min, and left to stand at room temperature for 20-30 h.

6. The preparation method according to claim 4, characterized in that: In step S1, the coating thickness of the adhesive layer is 0.20-0.30 mm, wherein the angle of the scraper is 50-60°, the pressure is 3-5 MPa, and the vehicle speed is 15-20 m / min.

7. The preparation method according to claim 4, characterized in that: In step S2, when preparing the coating for the surface decoration layer, the raw materials in corresponding weight parts are added in the order of plasticizer, hot potassium zinc stabilizer, viscosity reducer, anatase titanium dioxide, foaming agent, polyvinyl chloride resin and filler stone powder, first stirred at a speed of 400-500 rpm for 10-15 min, then stirred at a speed of 500-600 rpm for 5-10 min, and finally the viscosity of the surface decoration layer coating at 25-30° C. is adjusted to 10000CP-20000CP by the viscosity reducer.

8. The preparation method according to claim 4, characterized in that: In step S2, the coating of the decorative surface layer is pumped into the screen mold using a vacuum diaphragm pump, and then the pressure of the scraper on the screen printing plate is adjusted. The printed material is squeezed from the mesh of the graphic part by the scraper onto the substrate, and then dried, cooled and rolled into a finished product.

9. The preparation method according to claim 4, characterized in that: In step S2, during screen printing, the printing temperature is 160-180° C. and the vehicle speed is 25-35 m / min.

10. The preparation method according to claim 4, characterized in that: In step S2, during the drying, the temperature is controlled to be 200-205° C. and the time is 51-72 seconds.

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