Reconstitutable self-adhesive paintable wallpaper and method of making

Abstract

The present application relates to self-adhesive wallpaper technical field, especially to a kind of complex solubility self-adhesive paint wallpaper and preparation method thereof, including adhesive layer, substrate and surface decoration layer, wherein, the adhesive layer includes the following weight fraction of raw materials: polyvinyl alcohol resin 80-120 parts, cellulose 50-60 parts, defoaming agent 1.5-6 parts, stabilizer 10-12 parts, 4,5-dichloro-2-octyl-3(2H)-isothiazolone 7.5-9 parts and pure water 400-500 parts.The present application complex solubility self-adhesive paint wallpaper is not sticky after drying, can restore tack after painting water, can ensure good adhesion effect when construction, and can realize repeated construction and free movement, with back glue, no additional glue is needed, simple and convenient operation, greatly save construction time and labor cost, solve the current self-adhesive wallpaper using adhesive material, once pasted in construction process, it is difficult to move and adjust, and when disassembling, wall or paper itself may be damaged, leading to the problem of secondary use difficulty.

Description

Technical Field

[0001] This invention relates to the field of self-adhesive wallpaper technology, and in particular to a resolubilizing self-adhesive paintable wallpaper and its preparation method. Background Technology

[0002] Wallpaper, as a wall decoration material with a long history, has a development closely linked to the advancements in papermaking and printing. With technological progress and changing market demands, the types and characteristics of wallpaper are constantly being 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 friendliness.

[0003] Traditional wallpaper installation typically requires wallpaper glue, which not only increases the difficulty and cost of installation but also poses potential hazards to the environment and human health if the glue is used improperly. Self-adhesive wallpaper effectively solves this problem. By coating the back of the wallpaper with an adhesive layer, users can directly paste the wallpaper onto the wall without applying additional glue. This greatly simplifies the installation process and improves efficiency.

[0004] However, existing self-adhesive wallpaper still faces several unresolved issues in its application. Firstly, the adhesive backing is difficult to move or adjust once applied, causing inconvenience for users. Misalignment or design changes can damage the wallpaper or wall, increasing the difficulty and cost of reinstallation. Secondly, removing existing self-adhesive wallpaper can damage the wall or the wallpaper itself, rendering it unusable and wasting resources.

[0005] Therefore, although existing self-adhesive wallpapers have advantages such as convenience and environmental friendliness, there are still some problems in their application.

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

[0007] The purpose of this invention is to provide a resoluble self-adhesive paintable wallpaper and its preparation method. This resoluble self-adhesive paintable wallpaper is non-adhesive after drying, but can regain its adhesiveness after being wetted. During construction, it can ensure good adhesion, and can be repeatedly applied and moved freely. It has its own adhesive backing, so no additional glue is needed. The operation is simple and convenient, and it greatly saves construction time and labor costs.

[0008] In a first aspect, the present invention provides a resoluble 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 defoamer, 10-12 parts of stabilizer, 7.5-9 parts of 4,5-dichloro-2-octyl-3(2H)-isothiazolidinone, and 400-500 parts of purified water.

[0010] The adhesive layer of the self-adhesive paintable wallpaper of the present invention mainly comprises polyvinyl alcohol resin, cellulose, defoamer, stabilizer, 4,5-dichloro-2-octyl-3(2H)-isothiazolidinone, and purified water. The polyvinyl alcohol molecule contains a large number of hydroxyl groups (-OH), which are highly polar 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 extend and disperse in the water. This dispersion enhances the interaction between polyvinyl alcohol molecules, thus exhibiting viscosity. Cellulose molecules contain numerous hydrophilic hydroxyl (-OH) groups and a complex hierarchical structure. When cellulose comes into contact with water, these hydrophilic groups attract and bind water molecules, causing the cellulose to expand in volume. Simultaneously, the relatively loose ultrastructure of the fiber provides space for water molecules to penetrate the internal structure of the cellulose, allowing them to permeate all parts of the molecule. This increases the intermolecular forces, thereby enhancing adhesion. Furthermore, cellulose has high volume expansion properties; when re-dissolved with water during application, the volume of the adhesive layer increases instantaneously, increasing viscosity and thickness, reducing the wall's absorption of the adhesive, and enhancing mobility and repeatability. In addition, after high-temperature treatment, the dehydration, etherification, and carbonization of polyvinyl alcohol alters its molecular structure, resulting in the loss of its original solubility and some chemical activity. Excessively high temperatures can also lead to decreased viscosity, yellowing, and decomposition to produce toxic substances such as ethylene, primary ethers, and oligomers. To address this issue, the adhesive layer of this invention also contains a stabilizer to reduce the impact of temperature on the product's performance during processing and use, thereby improving the stability of the adhesive layer's adhesion. The defoamer can maximize the activation and dispersion of polyvinyl alcohol, thereby allowing the hydroxyl groups and water molecules in the polyvinyl alcohol to fully combine, promoting the improvement of the adhesive layer's adhesion. Finally, the adhesive layer of this invention also contains a 4,5-dichloro-2-octyl-3(2H)-isothiazolidinone antifungal agent, which can effectively kill Penicillium, Basidiomycetes, Aspergillus niger, Fusarium, Curvularia, and Pseudomonas aeruginosa.

[0011] Therefore, the self-adhesive paintable wallpaper of this invention possesses the property of being non-sticky after drying and regaining its stickiness after being wetted. During construction, it ensures good adhesion while allowing for repeated application and free movement. It has self-adhesive backing, eliminating the need for additional glue, making operation simple and convenient, and significantly saving construction time and labor costs. It solves the problem of current self-adhesive wallpapers using self-adhesive materials, which are difficult to move and adjust once pasted, and may damage the wall or the paper itself during removal, leading to difficulties in reuse.

[0012] Specifically, the self-adhesiveness of the adhesive layer of this invention mainly stems from the unique molecular structure and physical properties of polyvinyl alcohol (PVA). PVA molecules contain a large number of hydroxyl groups (-OH), which are highly polar and capable of forming hydrogen bonds with water molecules and polar groups on solid surfaces. When PVA dissolves in water, these hydroxyl groups not only form hydrogen bonds with water molecules, allowing PVA molecules to fully extend and disperse in water and enhancing intermolecular interactions, but also cause PVA molecules to cross-link with each other through hydrogen bonds, forming a three-dimensional network structure. Furthermore, the long-chain structure of PVA also makes it easy for molecules to entangle, further enhancing its adhesiveness.

[0013] Specifically, PVA aqueous solutions can adhere tightly to solid surfaces, forming an adsorbed film that exhibits viscosity. Simultaneously, it can also adsorb at the air-water interface, reducing surface tension and increasing the stability and viscosity of the aqueous solution. This self-adhesive property allows PVA adhesive layers to achieve tight bonding 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 redissolve and regain its tackiness when it comes into contact with 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 PVA molecules do not completely disappear during the drying process. When exposed to water again, these hydroxyl groups can quickly form hydrogen bonds with water molecules, causing the PVA molecules to redisperse in the water and exhibit viscosity. Simultaneously, although the long-chain structure of PVA may shrink and aggregate to some extent during drying, its structure is not completely destroyed. When exposed to water again, water molecules can penetrate between the PVA molecules, causing the molecular chains to gradually extend and disperse, restoring it to a state similar to its undried state.

[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 exposed to water again, these residual physical cross-links can be restored, further enhancing the adhesiveness of PVA. Furthermore, the entanglement of PVA molecules persists after drying; when exposed to water again, this entanglement can, to some extent, maintain the interactions between PVA molecules, thus preserving its adhesiveness.

[0017] Therefore, the adhesive layer of the present invention, with PVA as the main component, not only has good self-adhesion, enabling tight bonding between materials without the need for additional adhesives, but also has excellent resolubility, being able to redissolve and regain its adhesiveness when exposed to water again after drying.

[0018] As a preferred embodiment of this technical solution, the surface decorative 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.

[0019] When preparing a colored surface decorative layer, other pigments and other substances may be added, but this invention does not impose strict limitations on them.

[0020] As a preferred embodiment of this technical solution, the substrate is a non-woven paper substrate, and the basis weight of the substrate is 90-150 g / m³. 2 The thickness is 0.17-0.30mm, the longitudinal tensile strength is not less than 3KN / m, the transverse tensile strength is not less than 1.6KN / m, the longitudinal wet tensile strength is not less than 1.0KN / m, the longitudinal tear strength is not less than 1.2KN / m, the transverse tear strength is not less than 1.5KN / m, and the air permeability is greater than 550cm. 3 / min·cm 2 The transverse wet shrinkage rate is no more than 0.8%, and the water absorption is 20-28 g / m². 2 .

[0021] Non-woven paper substrates are characterized by their unique fiber structure and good water absorption (20-28 g / m³). 2 The nonwoven substrate effectively absorbs and retains moisture and solvents in the adhesive layer, which is crucial for the wallpaper's resolvability during use. When the wallpaper needs to be re-pasted or repositioned, the nonwoven substrate can quickly absorb moisture and soften the adhesive layer, thus achieving good resolvability.

[0022] High air permeability of nonwoven paper substrate (greater than 550cm) 3 / min·cm 2 The low lateral wet shrinkage rate (not more than 0.8%) helps ensure that the substrate remains dimensionally stable during the wallpaper wetting and drying process, avoiding deformation or curling, thereby maintaining the uniformity and rehydration effect of the adhesive layer.

[0023] 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 it is not easy to tear or break. This ensures that the adhesive layer can adhere tightly to the wall or other substrate, achieving good self-adhesion.

[0024] Finally, appropriate thickness (0.17-0.30mm) and basis weight (90-150g / m³) are required. 2 This allows the nonwoven paper substrate to have sufficient strength while remaining thin and soft, making it easy to install and adhere to walls, and also helps the adhesive layer to be evenly distributed and effectively adhered to the substrate.

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

[0026] Secondly, the present invention also provides a method for preparing the above-mentioned resolvable self-adhesive paintable wallpaper, specifically including the following steps:

[0027] S1. Apply the adhesive coating to the back of the substrate, and then dry, cure, and roll-press it in sequence to obtain a substrate with an adhesive coating on the back.

[0028] S2. A surface decorative layer is printed on the upper surface of the substrate by screen printing, and after drying and cooling, a resolvable self-adhesive paintable wallpaper is obtained.

[0029] During the drying and curing process, a five-zone oven with an upper and lower air vent structure is used for drying and curing. The temperature of the first zone oven is 150-160℃, the temperature of the second zone oven is 170-180℃, the temperature of the third zone oven is 180-190℃, the temperature of the fourth zone oven is 190-200℃, and the temperature of the fifth zone oven is 200-210℃.

[0030] In the preparation method of the resoluble self-adhesive paintable wallpaper of the present invention, the adhesive layer coating is first applied to the back of the substrate to obtain a substrate with an adhesive layer on the back. Then, a surface decorative layer is printed on the upper surface of the substrate by screen printing to obtain the resoluble self-adhesive paintable wallpaper. The drying and curing process of the adhesive layer has a significant impact on the self-adhesion and resoluble properties of the final wallpaper. Therefore, the present invention proposes using a five-zone oven with an upper and lower air vent structure for drying and curing, and further using a specific temperature gradient to ensure that the adhesive layer is fully cured and forms good properties, thereby improving the self-adhesion and resoluble properties of the wallpaper.

[0031] Specifically, during the drying and curing process of this invention, the solvent in the adhesive layer gradually evaporates, and the resin and additives form a stable structure. The drying and curing temperature and time of this invention ensure that the adhesive layer is fully cured, forming a tough and somewhat elastic film, thereby enhancing the self-adhesiveness of the wallpaper. Furthermore, the temperature gradient setting in the drying and curing process of this invention helps the adhesive layer to gradually dehydrate and cure, avoiding performance degradation caused by excessively fast or slow curing speeds. A fully dried and cured adhesive layer can form a stronger bond with the substrate and wall surface, ensuring that the wallpaper is less prone to peeling or curling during use. Appropriate drying and curing conditions can also improve the heat and moisture resistance of the adhesive layer, further enhancing the self-adhesiveness of the wallpaper.

[0032] Furthermore, high temperatures help the solvent in the adhesive layer evaporate fully, reducing solvent residue. Low solvent residue ensures that the wallpaper can quickly absorb water and soften the adhesive layer during re-solubilization, thus achieving good re-solubilization. If drying and curing are insufficient, more solvent may remain in the adhesive layer, causing the wallpaper to absorb water more slowly during re-solubilization, or even failing to completely soften the adhesive layer, affecting the re-solubilization effect. A properly dried and cured adhesive layer has a more stable structure and is less susceptible to changes caused by external environmental factors. This helps ensure that the wallpaper's re-solubilization remains consistent during long-term storage or use. A stable adhesive layer also reduces potential problems such as sticking and deformation during re-solubilization, improving the overall performance after re-solubilization.

[0033] As a preferred embodiment of this technical solution, in step S1, when preparing the coating for the adhesive layer, the corresponding weight parts of the raw materials are added sequentially according to the order of adding liquid first and then powder. The mixture is first stirred at 600-800 rpm for 20-40 minutes, and then stirred at 1000-1200 rpm for 20-40 minutes to fully improve the dispersion effect of each raw material. Finally, the obtained coating is placed at room temperature and allowed to stand for 20-30 hours.

[0034] As a preferred embodiment of this 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 speed is 15-20 m / min.

[0035] In a preferred embodiment of this technical solution, in step S2, when preparing the coating for the surface decorative layer, the raw materials are added in the following order: plasticizer, hot potassium zinc stabilizer, viscosity reducer, anatase titanium dioxide, foaming agent, polyvinyl chloride resin, and filler stone powder. The mixture is first stirred at 400-500 rpm for 10-15 minutes, then stirred at 500-600 rpm for 5-10 minutes. Finally, the viscosity of the surface decorative layer coating at 25-30℃ is adjusted to 10000CP-20000CP using the viscosity reducer.

[0036] When adjusting viscosity, add the viscosity reducer in small amounts multiple times to dilute it, to prevent excessive addition of the viscosity reducer, which would result in too low viscosity and fail to meet the process requirements; when preparing colored paste, use a small amount of plasticizer to clean the pigment container as much as possible to prevent the viscosity from being too low.

[0037] As a preferred embodiment of this technical solution, in step S2, the coating of the decorative surface layer is pumped into the screen printing mold using a vacuum diaphragm pump. The printing is carried out by utilizing the basic principle that the mesh openings of the image area of ​​the screen printing plate are permeable to ink, while the mesh openings of the non-image area are impermeable to ink. Then, the pressure of the squeegee on the screen printing plate is adjusted, and the printed material is squeezed from the mesh openings of the image area onto the substrate by the squeegee. The substrate is then dried, cooled, and rolled into a finished product.

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

[0039] As a preferred embodiment of this technical solution, in step S2, the drying process is carried out at a temperature of 200-205℃ for 51-72 seconds.

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

[0041] 1. The self-adhesive paintable wallpaper of the present invention comprises an adhesive layer, a substrate, and a surface decorative layer. The adhesive layer comprises the following raw materials: polyvinyl alcohol resin, cellulose, defoamer, stabilizer, 4,5-dichloro-2-octyl-3(2H)-isothiazolidinone, and purified water. In the adhesive layer, the polyvinyl alcohol molecule contains a large number of hydroxyl groups (-OH), which are highly polar 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 extend and disperse in the water. This dispersion enhances the interaction between polyvinyl alcohol molecules, thus exhibiting adhesion. Cellulose molecules contain numerous hydroxyl (-OH) hydrophilic groups and a complex multi-level structure. When cellulose comes into contact with water, the hydrophilic groups attract and bind water molecules, causing the cellulose to expand in volume. Simultaneously, the relatively loose ultrastructure of the fiber provides space for water molecules to penetrate the internal structure of the cellulose, allowing water molecules to permeate all parts of the molecule. This increases the intermolecular forces, thereby enhancing adhesion. Furthermore, cellulose has high volume expansion properties; when re-dissolved with water during application, the volume of the adhesive layer increases instantaneously, viscosity increases, and the adhesive layer becomes thicker, reducing the wall's absorption of the adhesive and enhancing mobility and repeatability. In addition, the adhesive layer of this invention also includes defoamers, stabilizers, and 4,5-dichloro-2-octyl-3(2H)-isothiazolidinone antifungal agents to further improve the stability of the adhesive layer. Therefore, the self-adhesive paintable wallpaper of this invention is non-adhesive after drying, but regains its adhesiveness after applying water. During construction, it can ensure good adhesion, allow for repeated construction and free movement. It has self-adhesive backing, eliminating the need for additional glue application, making it simple and convenient to operate. It greatly saves construction time and labor costs, and solves the problem that current self-adhesive wallpapers use self-adhesive materials, which are difficult to move and adjust once pasted during construction, and may damage the wall or the paper itself when disassembled, leading to difficulties in secondary use.

[0042] 2. The self-adhesive paintable wallpaper of the present invention can be easily peeled off the wall without causing serious damage to the wall or leaving a lot of glue residue, which facilitates the renovation and decoration of the wall.

[0043] 3. The self-adhesive paintable wallpaper of the present invention is made of environmentally friendly materials, which meets the modern people's demand for environmentally friendly decoration materials. In addition, there is no need to use traditional glue during the pasting process, thus avoiding the release of harmful substances such as formaldehyde that may be caused by glue.

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

[0045] 5. The surface decorative layer of the self-adhesive paintable 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 match various decoration styles;

[0046] 6. The self-adhesive paintable wallpaper of this invention is easy to install, and ordinary people can complete the installation themselves. While saving costs, it brings users a convenient, beautiful, durable and creative experience. Attached Figure Description

[0047] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0048] Figure 1 This is a schematic diagram of the structure of the self-adhesive paintable wallpaper of the present invention.

[0049] Explanation of reference numerals in the attached figures:

[0050] 1. Surface decorative layer; 2. Substrate; 3. Adhesive layer. Detailed Implementation

[0051] It should be noted that the following detailed descriptions are illustrative and intended to provide further explanation of this application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0052] It should be noted that the terminology used herein is for the purpose of describing particular implementations only and is not intended to limit the exemplary implementations according to this application. As used herein, the singular form includes the plural form unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this description, they indicate 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 with reference to the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0054] Example 1

[0055] In this embodiment, the adhesive layer comprises the following raw materials in parts by weight: 100 parts of polyvinyl alcohol resin, 55 parts of cellulose, 4 parts of defoamer, 11 parts of stabilizer, 8 parts of 4,5-dichloro-2-octyl-3(2H)-isothiazolidinone 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, and add the corresponding weight parts 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 later use.

[0058] In this embodiment, the basis weight of the nonwoven paper substrate is 90-150 g / m². 2 The thickness is 0.17-0.30mm, the longitudinal tensile strength is not less than 3KN / m, the transverse tensile strength is not less than 1.6KN / m, the longitudinal wet tensile strength is not less than 1.0KN / m, the longitudinal tear strength is not less than 1.2KN / m, the transverse tear strength is not less than 1.5KN / m, and the air permeability is greater than 550cm. 3 / min·cm 2 The transverse wet shrinkage rate is no more than 0.8%, and the water absorption is 20-28 g / m². 2 .

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

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

[0061] Accurately weigh all raw materials to meet the requirements of the formula and maintain a uniform and consistent process, including liquid metering and powder metering.

[0062] Add the corresponding weight parts of the raw materials in the following order: 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 minutes, and then at 500 rpm for 5-10 minutes.

[0063] Dispense a cup of paste from the sampling gate, measure the paste temperature with a thermometer, and measure the viscosity with a rotational viscometer (generally using a No. 4 rotor at 60 rpm, unless otherwise specified). If the viscosity is high, add an appropriate amount of viscosity reducer to adjust it to the viscosity required by the process. At the same time, measure the paste temperature, record the process, and finally adjust the viscosity of the surface decorative coating at 30°C to 10,000 cp.

[0064] Notice:

[0065] (1) When adjusting the viscosity, add the viscosity reducer in small amounts and multiple times to dilute it, so as to prevent the viscosity reducer from being added in excess, which would result in the viscosity being too low and failing to meet the process requirements;

[0066] (2) The filter screen should be inspected, cleaned, and replaced 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 paint paste, use a small amount of plasticizer to clean the pigment container to prevent excessively low viscosity. The preparation method of the resolvable self-adhesive paintable wallpaper in this embodiment includes the following steps:

[0069] S1. Apply the adhesive coating to the back of the substrate, controlling the scraper angle to 50°, the pressure to 3 MPa, and the machine speed to 15-20 m / min, so that the final adhesive coating thickness is 0.2 mm. Then, use a five-zone oven with an upper and lower air vent structure for drying and curing. The temperature of the first zone oven is 150-160℃, the second zone oven is 170-180℃, the third zone oven is 180-190℃, the fourth zone oven is 190-200℃, and the fifth zone oven is 200-210℃. After passing through a smooth roller press, cool and roll up to obtain a substrate with an adhesive coating on the back.

[0070] S2. The coating for the decorative surface layer is pumped into the screen printing mold using a vacuum diaphragm pump. The pressure of the squeegee on the screen printing plate is then adjusted. The printed material is squeezed from the mesh of the graphic area onto the substrate by the squeegee. The printing temperature is 160℃ and the printing speed is 25-35m / min. Then, it is dried at 200℃ for 72 seconds. Finally, it is cooled and rolled into a finished product to obtain the resolubilized self-adhesive paintable wallpaper.

[0071] Example 2

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

[0073] In this embodiment, the basis weight of the nonwoven paper substrate is 90-150 g / m². 2 The thickness is 0.17-0.30mm, the longitudinal tensile strength is not less than 3KN / m, the transverse tensile strength is not less than 1.6KN / m, the longitudinal wet tensile strength is not less than 1.0KN / m, the longitudinal tear strength is not less than 1.2KN / m, the transverse tear strength is not less than 1.5KN / m, and the air permeability is greater than 550cm. 3 / min·cm 2The transverse wet shrinkage rate is no more than 0.8%, and the water absorption is 20-28 g / m². 2 .

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

[0075] The preparation method of the resoluble self-adhesive paintable wallpaper in this embodiment includes the following steps:

[0076] S1. Apply the adhesive coating to the back of the substrate, controlling the scraper angle to 55°, the pressure to 5 MPa, and the machine speed to 15-20 m / min, so that the final adhesive coating thickness is 0.3 mm. Then, use a five-zone oven with an upper and lower air vent structure for drying and curing. The temperature of the first zone oven is 150-160℃, the second zone oven is 170-180℃, the third zone oven is 180-190℃, the fourth zone oven is 190-200℃, and the fifth zone oven is 200-210℃. After passing through a smooth roller press, cool and roll up to obtain a substrate with an adhesive coating on the back.

[0077] S2. The coating for the decorative surface layer is pumped into the screen printing mold using a vacuum diaphragm pump. The pressure of the squeegee on the screen printing plate is then adjusted. The printed material is squeezed from the mesh of the graphic area onto the substrate by the squeegee. The printing temperature is 180℃ and the printing speed is 25-35m / min. Then, it is dried at 205℃ for 51 seconds. Finally, it is cooled and rolled into a finished product to obtain the resolubilized self-adhesive paintable wallpaper.

[0078] Example 3

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

[0080] In this embodiment, the basis weight of the nonwoven paper substrate is 90-150 g / m². 2 The thickness is 0.17-0.30mm, the longitudinal tensile strength is not less than 3KN / m, the transverse tensile strength is not less than 1.6KN / m, the longitudinal wet tensile strength is not less than 1.0KN / m, the longitudinal tear strength is not less than 1.2KN / m, the transverse tear strength is not less than 1.5KN / m, and the air permeability is greater than 550cm. 3 / min·cm 2 The transverse wet shrinkage rate is no more than 0.8%, and the water absorption is 20-28 g / m². 2 .

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

[0082] The preparation method of the resoluble self-adhesive paintable wallpaper in this embodiment includes the following steps:

[0083] S1. Apply the adhesive coating to the back of the substrate, controlling the scraper angle to 55°, the pressure to 4 MPa, and the machine speed to 15-20 m / min, so that the final adhesive coating thickness is 0.25 mm. Then, use a five-zone oven with an upper and lower air vent structure for drying and curing. The temperature of the first zone oven is 150-160℃, the second zone oven is 170-180℃, the third zone oven is 180-190℃, the fourth zone oven is 190-200℃, and the fifth zone oven is 200-210℃. After passing through a smooth roller pressing layer, cool and roll up to obtain a substrate with an adhesive coating on the back.

[0084] S2. The coating for the decorative surface layer is pumped into the screen printing mold using a vacuum diaphragm pump. The pressure of the squeegee on the screen printing plate is then adjusted. The printed material is squeezed from the mesh of the graphic area onto the substrate by the squeegee. The printing temperature is 170℃ and the printing speed is 25-35m / min. Then, it is dried at 205℃ for 60 seconds. Finally, it is cooled and rolled into a finished product to obtain the resolubilized self-adhesive paintable wallpaper.

[0085] Example 4

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

[0087] In this embodiment, the basis weight of the nonwoven paper substrate is 90-150 g / m². 2 The thickness is 0.17-0.30mm, the longitudinal tensile strength is not less than 3KN / m, the transverse tensile strength is not less than 1.6KN / m, the longitudinal wet tensile strength is not less than 1.0KN / m, the longitudinal tear strength is not less than 1.2KN / m, the transverse tear strength is not less than 1.5KN / m, and the air permeability is greater than 550cm. 3 / min·cm 2 The transverse wet shrinkage rate is no more than 0.8%, and the water absorption is 20-28 g / m². 2 .

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

[0089] The preparation method of the resoluble self-adhesive paintable wallpaper in this embodiment includes the following steps:

[0090] S1. Apply the adhesive coating to the back of the substrate, controlling the scraper angle to 55°, the pressure to 4 MPa, and the machine speed to 15-20 m / min, so that the final adhesive coating thickness is 0.25 mm. Then, use a five-zone oven with an upper and lower air vent structure for drying and curing. The temperature of the first zone oven is 150-160℃, the second zone oven is 170-180℃, the third zone oven is 180-190℃, the fourth zone oven is 190-200℃, and the fifth zone oven is 200-210℃. After passing through a smooth roller pressing layer, cool and roll up to obtain a substrate with an adhesive coating on the back.

[0091] S2. The coating for the decorative surface layer is pumped into the screen printing mold using a vacuum diaphragm pump. The pressure of the squeegee on the screen printing plate is then adjusted. The printed material is squeezed from the mesh of the graphic area onto the substrate by the squeegee. The printing temperature is 170℃ and the printing speed is 25-35m / min. Then, it is dried at 205℃ for 65 seconds and finally cooled and rolled into a finished product, resulting in a resolubilized self-adhesive paintable wallpaper.

[0092] Compare with Example 1

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

[0094] In this comparative example, the adhesive layer comprises the following raw materials in parts by weight: 100 parts polyvinyl alcohol resin, 4 parts defoamer, 11 parts stabilizer, 8 parts 4,5-dichloro-2-octyl-3(2H)-isothiazolidinone and 450 parts water.

[0095] Compare with Example 2

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

[0097] In this comparative example, the adhesive layer comprises the following raw materials in parts by weight: 55 parts cellulose, 4 parts defoamer, 11 parts stabilizer, 8 parts 4,5-dichloro-2-octyl-3(2H)-isothiazolidinone, and 450 parts water.

[0098] Compare with Example 3

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

[0100] In this comparative example, the adhesive layer comprises the following raw materials in parts by weight: 100 parts polyvinyl alcohol resin, 55 parts konjac powder, 4 parts defoamer, 11 parts stabilizer, 8 parts 4,5-dichloro-2-octyl-3(2H)-isothiazolidinone, and 450 parts water.

[0101] Figure 1 This is a schematic diagram of the structure of the self-adhesive paintable wallpaper of the present invention.

[0102] To study the adhesiveness and resolubility of the wallpapers prepared in the above embodiments and comparative examples, the peel force between the wallpapers of Example 1 and Comparative Examples 1-3 and the cement wall was tested. The test results are shown in Table 1.

[0103] Table 1 Test Results (Peel force is in N / 25mm)

[0104]

[0105] As shown in Table 1, the resolubilizing self-adhesive paintable wallpaper of the present invention has excellent resolubilizing and self-adhesive properties. During construction, it can ensure good adhesion and also achieve repeated construction and free movement.

[0106] Although polyvinyl alcohol resin containing a large number of hydroxyl groups was used in the adhesive layer of Comparative Example 1, the adhesive layer was thin due to the lack of cellulose with high volume expansion, resulting in poor adhesion or peeling after adhesion.

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

[0108] In Comparative Example 3, konjac powder was used to replace cellulose in the adhesive layer and was compounded with polyvinyl alcohol resin. Although konjac powder also has water absorption and swelling properties, which increases the volume of the adhesive layer, the konjac powder absorbs water too slowly and the volume of the adhesive layer does not expand in time. It takes a long time to completely dissolve after water is applied, which affects the construction progress. Therefore, the wallpaper prepared in Comparative Example 3 has poor remelting 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, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions 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, Includes adhesive layer, substrate and surface decorative 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 defoamer, 10-12 parts of stabilizer, 7.5-9 parts of 4,5-dichloro-2-octyl-3(2H)-isothiazolidinone, and 400-500 parts of purified water. The preparation method of the resolubilizing self-adhesive paintable wallpaper includes the following steps: S1. Apply the adhesive coating to the back of the substrate, and then dry, cure, and roll-press it in sequence to obtain a substrate with an adhesive coating on the back. S2. A surface decorative layer is printed on the upper surface of the substrate by screen printing, and after drying and cooling, a resolvable self-adhesive paintable wallpaper is obtained. During the drying and curing process, a five-zone oven with an upper and lower air vent structure is used for drying and curing. The temperature of the first zone oven is 150-160℃, the temperature of the second zone oven is 170-180℃, the temperature of the third zone oven is 180-190℃, the temperature of the fourth zone oven is 190-200℃, and the temperature of the fifth zone oven is 200-210℃. The resolubilized self-adhesive paintable wallpaper loses its stickiness after drying but regains its stickiness after being moistened with water. During construction, it can ensure good adhesion while allowing for repeated application and free movement.

2. The self-adhesive paintable wallpaper according to claim 1, characterized in that, The surface decorative 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 self-adhesive paintable wallpaper according to claim 1, characterized in that, The substrate is a non-woven paper substrate, and the basis weight of the substrate is 90-150 g / m². 2 The thickness is 0.17-0.30mm, the longitudinal tensile strength is not less than 3KN / m, the transverse tensile strength is not less than 1.6KN / m, the longitudinal wet tensile strength is not less than 1.0KN / m, the longitudinal tear strength is not less than 1.2KN / m, the transverse tear strength is not less than 1.5KN / m, and the air permeability is greater than 550cm³ / min·cm. 2 The transverse wet shrinkage rate is no more than 0.8%, and the water absorption is 20-28 g / m². 2 .

4. The self-adhesive paintable wallpaper according to claim 1, characterized in that, In step S1, when preparing the coating for the adhesive layer, the corresponding weight parts of the raw materials are added in the order of liquid first and then powder. The mixture is first stirred at 600-800 rpm for 20-40 min, then stirred at 1000-1200 rpm for 20-40 min, and then allowed to stand at room temperature for 20-30 h.

5. The resolvable self-adhesive paintable wallpaper according to claim 1, characterized in that, In step S1, the adhesive layer coating thickness is 0.20-0.30 mm, and the squeegee angle is 50-60 degrees. o The pressure is 3-5 MPa and the vehicle speed is 15-20 m / min.

6. The resolubilizing self-adhesive paintable wallpaper according to claim 1, characterized in that, In step S2, during the preparation of the coating for the surface decorative layer, the raw materials are added in the following order: plasticizer, hot potassium zinc stabilizer, viscosity reducer, anatase titanium dioxide, foaming agent, polyvinyl chloride resin, and filler stone powder. The mixture is first stirred at 400-500 rpm for 10-15 minutes, then stirred at 500-600 rpm for 5-10 minutes. Finally, the viscosity of the coating at 25-30℃ is adjusted to 10000CP-20000CP using the viscosity reducer.

7. The self-adhesive paintable wallpaper according to claim 1, characterized in that, In step S2, the coating for the decorative surface layer is pumped into the screen printing mold using a vacuum diaphragm pump. Then, the pressure of the squeegee on the screen printing plate is adjusted, and the printed material is squeezed from the mesh of the graphic part onto the substrate by the squeegee. The material is then dried, cooled, and rolled into a finished product.

8. The resolubilizing self-adhesive paintable wallpaper according to claim 1, characterized in that, In step S2, during screen printing, the printing temperature is 160-180℃ and the machine speed is 25-35m / min.

9. The resolvable self-adhesive paintable wallpaper according to claim 1, characterized in that, In step S2, during the drying process, the temperature is controlled at 200-205℃ and the time is 51-72 seconds.

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