Preparation method of masking paper gum capable of protecting wall coating

Abstract

The invention discloses a preparation method of a masking paper back adhesive capable of protecting a wall coating, which solves the problems that the existing low-viscosity back adhesive is unstable in adhesion and the high-viscosity back adhesive damages a wall by integrating a low-viscosity special curing adhesive (side A) and a high-viscosity cloth grain double-sided adhesive (side B) on two sides of a film-coated crepe paper base material. The preparation method comprises the steps of plant fiber crepe paper preparation, thin PET film covering, A / B face differential gluing and curing forming, and the prepared product has the stable pasting and coating protection functions and is suitable for various wall decoration scenes.

Description

Technical Field

[0001] This invention belongs to the field of building decoration materials technology, specifically relating to a method for preparing masking tape backing adhesive for protecting coatings during wall construction, and more particularly to a method for preparing backing adhesive that combines adhesive stability and wall coating protection function through an integrated molding design of low-viscosity and high-viscosity adhesive layers. Background Technology

[0002] In fields such as architectural decoration, electronics manufacturing, and industrial spraying, masking tape, as a temporary masking and protective material, needs to balance adhesion stability with the safety of the protected surface. However, existing technologies have the following core shortcomings: Defects of low-viscosity adhesive layers: Although traditional low-viscosity masking tapes (such as acrylic tapes) have weak adhesion to wall paint, they are prone to falling off due to friction or external force during application, especially in high-temperature or humid environments, where the adhesiveness decreases significantly, causing masking failure. High-viscosity adhesive layer damage: While high-viscosity rubber-based adhesives (such as styrene-butadiene rubber-based adhesives) can enhance bonding strength, they are prone to leaving adhesive residue upon peeling. Furthermore, their high permeability can erode the paint surface, leading to scratches or stains on the wall. The material structure is too simple: most existing masking tapes use a single adhesive layer design, which cannot balance the needs of adhesion and protection. For example, some products increase strength by increasing the thickness of the adhesive layer, but this leads to a decrease in flexibility and easy breakage; others use a multi-layer composite structure, but the functions of each layer are not coordinated enough, such as failing to effectively isolate the adhesive layer from contact with the wall.

[0003] Insufficient environmental adaptability: Traditional masking tape has a narrow temperature range (-10℃~60℃), is prone to softening at high temperatures and becoming brittle at low temperatures, and has poor resistance to chemical corrosion, which limits its application in complex construction environments. Summary of the Invention

[0004] This invention aims to provide a method for preparing masking tape backing adhesive that can protect wall coatings. By integrally molding low-viscosity masking tape and high-viscosity textured adhesive, it solves the problems of unstable adhesion of existing low-viscosity backing adhesives and damage to wall coatings by high-viscosity backing adhesives, and achieves the dual functions of "stable adhesion" and "coating protection".

[0005] To achieve the above objectives, the present invention is implemented through the following technical solution: a method for preparing masking tape backing adhesive that can protect wall coatings, comprising the following steps: (1) using plant fiber as raw material, and making crepe paper through pulping, papermaking and creping processes; (2) laminating a thin PET film on the surface of the crepe paper to form a laminated crepe paper; (3) coating a special curing adhesive on the A side (the side in contact with the wall) of the laminated crepe paper; (4) coating a polyester film double-sided textured double-sided adhesive on the B side (the operating side) of the laminated crepe paper; (5) curing each adhesive layer to obtain the masking tape backing adhesive.

[0006] This claim is an independent claim, defining a complete technical solution for the preparation method and covering the core innovation points. In step (1), the "plant fiber" limits the source of materials, avoiding environmental problems caused by the use of synthetic fibers; in step (2), the "thin PET film" forms a physical isolation layer through hot-pressing (80-100℃), preventing the adhesive layer from directly contacting the wall; the differentiated adhesive design in steps (3) and (4) (low viscosity A side + high viscosity B side) is the key to solving the contradiction between "unstable adhesion" and "coating damage". The curing parameters (temperature and time) in step (5) ensure the stability of the adhesive layer performance. Through structural innovation and process parameter limitation, this claim constructs the widest scope of protection, meeting the requirements of the Patent Law for the "essential technical features" of an independent claim.

[0007] Furthermore, the plant fiber mentioned in step (1) is wood pulp, bamboo pulp, or a mixture of both, and the beating degree is 30-50°SR.

[0008] This claim is a dependent claim, which refines the raw materials and process parameters of step (1). Specifying "wood pulp / bamboo pulp" controls the length and strength of paper fibers, avoiding the breakage problem caused by using straw pulp; "beating degree 30-50°SR" optimizes the paper's bulkiness through the degree of fiber fibrillation, directly affecting the creping effect of the crepe paper. This claim enhances the feasibility of the technical solution through material selection and process parameter limitations, and as an intermediate-level claim, provides a basis for subsequent more detailed dependent claims.

[0009] Furthermore, the basis weight of the paper in the papermaking process described in step (1) is 50-80 g / m³. 2 The wrinkling process uses a scraper with a scraper angle of 15°-30° and a wrinkling rate of 10%-20%.

[0010] This claim further defines the basis weight and creping process parameters of the crepe paper. Paper basis weight (50-80 g / m³) 2 This design balances flexibility and tensile strength, preventing paper from tearing due to excessively low basis weight. The doctor blade angle (15°-30°) and wrinkle rate (10%-20%) work together to control wrinkle density and depth, ensuring uniform lamination of the PET film after coating. This claim, through refined process parameters, improves product consistency, meets the "full disclosure" requirement in patent examination, and, as a refinement of an independent claim, enhances the clarity of technical feature comparison during infringement determination.

[0011] Furthermore, the thickness of the thin PET film in step (2) is 10-20 μm, the light transmittance is ≥90%, and it is hot-pressed with the crepe paper at a temperature of 80-100℃ and a pressure of 0.2-0.5 MPa.

[0012] This claim specifies parameters for the lamination process. The PET film thickness (10-20 μm) and light transmittance (≥90%) ensure a balance between the physical and optical properties of the insulating layer; the hot-pressing composite parameters (temperature, pressure) prevent film peeling or blistering. This claim, through precise control of material specifications and process conditions, solves the problem of insufficient interfacial adhesion that easily occurs in traditional lamination processes, and is an extension of the "essential technical features," enhancing the practicality of the technical solution.

[0013] Furthermore, the special curing adhesive mentioned in step (3) is an acrylic adhesive with a solid content of 40%-50%, a viscosity of 1000-3000 mPa·s (25℃), a curing method of UV curing or heat curing, and a curing time of 10-30 seconds.

[0014] This claim defines the type and performance parameters of the adhesive on side A. The selection of acrylic adhesives is based on their low viscosity and high cohesive strength; the solid content and viscosity range ensure smooth coating processes; UV / thermal curing methods and time parameters optimize reaction efficiency and prevent over-curing that could lead to adhesive layer embrittlement. This claim achieves the technical effect of "low-damage peeling" through a combination of material chemical properties and process parameters, further supporting the "special curing adhesive" mentioned in the independent claim.

[0015] Furthermore, the peel strength of the special curing adhesive described in step (3) is 2-5 N / cm (peeling from the cement wall), and there is no residual adhesive after curing.

[0016] This claim clearly defines the key performance indicators of the A-side adhesive. Peel strength (2-5 N / cm) is achieved by controlling the crosslinking density, ensuring moderate adhesion to the wall paint during application; the requirement of no adhesive residue is achieved by adding a low-migration film-forming aid (such as ethyl acetate). This claim quantifies the technical effect, providing a clear comparative standard for infringement determination, and complies with the patent law's requirement of "based on the specification."

[0017] Furthermore, in step (4), the polyester film thickness of the double-sided polyester film with fabric texture double-sided adhesive is 20-30 μm, the depth of the fabric texture pattern is 0.05-0.1 mm, and the density is 5-10 stripes / cm. 2 The adhesive layer is a rubber-based acrylic adhesive with a peel strength of 8-12 N / cm (peeling from the working surface).

[0018] This claim defines the structural parameters of the B-side adhesive. The polyester film thickness (20-30 μm) and the texture depth (0.05-0.1 mm) synergistically increase the coefficient of friction, preventing slippage on the operating surface; the peel strength of the rubber-based acrylic adhesive (8-12 N / cm) is achieved through optimized ratios of fillers (such as calcium carbonate) and tackifying resins. This claim addresses the problem of high-viscosity adhesive layers easily damaging walls through microstructural design and adhesive modification, representing a technological advancement of the "double-sided textured double-sided adhesive" in the independent claim.

[0019] Furthermore, in step (4), 0.5%-2% of an antistatic agent is added to the adhesive layer of the double-sided polyester film textured double-sided adhesive to prevent dust from adsorbing onto the operating surface.

[0020] This claim introduces a functional additive (antistatic agent) to solve the problem of traditional double-sided adhesives easily attracting dust, leading to a decline in construction quality. The type of antistatic agent (such as quaternary ammonium salts) and the amount added (0.5%-2%) need to be verified experimentally to ensure that it does not affect the initial tack and weather resistance of the adhesive. This claim improves the practicality of the product through ingredient innovation and represents a further refinement of the dependent claims, enhancing the comprehensiveness of the technical solution.

[0021] Furthermore, the curing process in step (5) is carried out at a temperature of 60-80°C for 5-10 minutes and at an ambient humidity of 30%-50%.

[0022] This claim defines the post-processing parameters. Temperature (60-80℃) and time (5-10 minutes) ensure complete curing of the adhesive layer and prevent thermal stress from causing paper deformation; humidity control (30%-50%) prevents moisture absorption from affecting the adhesive performance. This claim, through precise control of process parameters, ensures batch stability of the product and is a necessary supplement to the "curing and molding" in the independent claim.

[0023] Furthermore, when the A-side adhesive layer is peeled off from the wall, there is no paint residue, and when the B-side adhesive layer is peeled off from the work surface, there is no paper tearing. The overall temperature resistance range is -20℃ to 80℃.

[0024] This claim is a product claim, defining the performance indicators of the final product. The "no paint residue" on side A is achieved through the synergistic effect of the low-viscosity adhesive and the PET film; the "no paper tearing" on side B relies on the flexibility of the crepe paper and the stress-dispersing design of the textured adhesive; the temperature resistance range (-20℃~80℃) is verified through adhesive weather resistance testing. This claim transforms the technical solution into quantifiable product characteristics, meeting the patent law requirements of "sufficient disclosure" and "support," and simultaneously, as a superior generalization of an independent claim, expands the scope of protection.

[0025] Advantages of this invention: This invention achieves the following breakthrough advantages through the synergistic design of "low-viscosity A-side adhesive + high-viscosity B-side adhesive + composite substrate": Improved adhesion stability and protection A-side low-viscosity adhesive: uses acrylic ester adhesive (peel strength 2-5N / cm), with moderate adhesion to avoid damaging the coating; combined with a PET film isolation layer, it further reduces the risk of direct contact between the adhesive layer and the wall, leaving no adhesive residue after peeling.

[0026] B-side high viscosity adhesive: Rubber-type double-sided textured adhesive (peel strength 8-12N / cm) increases friction through the textured pattern (depth 0.05-0.1mm), ensuring firm adhesion on the operating surface, and the elastic design of the adhesive layer can buffer peel stress and prevent paper tearing.

[0027] Material structure innovation and optimization Crepe paper substrate: Plant fiber pulping (30-50°SR), papermaking (basis weight 50-80g / m³) 2 Made using a combination of flexibility and tensile strength, as well as a doctor blade creping (angle 15°-30°) process, it has a tensile strength that is more than 30% higher than that of traditional wood pulp paper.

[0028] Composite membrane design: A thin PET film (10-20μm) and a polyester film (20-30μm) form a double-layer isolation barrier, extending the temperature resistance range to -20℃~80℃, and significantly enhancing UV resistance, making it suitable for outdoor construction.

[0029] Process compatibility and environmental friendliness Low-temperature curing technology: Side A adhesive is UV / heat cured (10-30 seconds), while side B adhesive is cured at room temperature, reducing energy consumption; antistatic agent (0.5%-2%) is added to the adhesive to prevent dust from adsorbing onto the working surface and improve the cleanliness of construction.

[0030] Non-toxic and harmless formula: The adhesive system does not contain benzene compounds, formaldehyde or other harmful substances, meets environmental protection standards, and is suitable for sensitive places such as food factories and hospitals.

[0031] Application scenario expansion Adaptability to complex curved surfaces: The tape can be applied to curved surfaces with a radius of ≥5mm, and its solvent resistance (resistance to toluene and ethanol wiping) is improved, making it suitable for delicate operations such as automotive painting and electronic component masking.

[0032] Economic optimization: Energy consumption is reduced through continuous production (coating speed 30-50m / min), and the unit area cost is reduced by 15%-20% compared with traditional products. Detailed Implementation

[0033] Example 1: High-stability masking tape adhesive for bamboo-wood composite substrate Material and process parameters: Crepe paper preparation: Raw materials: bamboo pulp (60%) + softwood pulp (40%), freeness 38°SR (softwood) / 24°SR (broadwood), paper basis weight 65g / m³ 2 .

[0034] Wrinkling process: scraper angle 22°, wrinkling rate 17%.

[0035] Coating treatment: The thin PET film is 18μm thick, with a light transmittance of 93%, a hot-pressing lamination temperature of 92℃, and a pressure of 0.38MPa.

[0036] Adhesive coating: A-side adhesive: Acrylic ester adhesive (solid content 48%, viscosity 2200mPa·s), with 0.3% defoamer added, UV curing time 22 seconds.

[0037] B-side adhesive: Double-sided fabric textured polyester film adhesive (polyester film thickness 28μm, fabric texture density 7 lines / cm) 2 (Elastic modulus 0.75 MPa).

[0038] Curing conditions: Temperature 72℃, time 7 minutes, humidity 42%.

[0039] Performance testing: Peel strength of surface A: 3.8 N / cm (cement wall), residual adhesive rate 0.07%.

[0040] Peel strength on side B: 10.2 N / cm (metal working surface), antistatic agent content 1.8%.

[0041] Temperature resistance: -22℃~82℃, no adhesive layer cracking.

[0042] Application scenario: Automotive paint masking, with a curved surface fit of ≥96% and a construction efficiency of 135m. 2 / h.

[0043] Example 2: Environmentally friendly masking tape backing adhesive based on pure bamboo pulp substrate Material and process parameters: Crepe paper preparation: Raw materials: 100% bamboo pulp fiber, freeness 36°SR, paper basis weight 72g / m³ 2 .

[0044] Wrinkling process: scraper angle 26°, wrinkling rate 20%.

[0045] Coating treatment: The thin PET film is 12μm thick with a light transmittance of 96%. The hot-pressing lamination temperature is 88℃ and the pressure is 0.28MPa.

[0046] Adhesive coating: A-side adhesive: Bio-based acrylic adhesive (42% solids content, 1800 mPa·s viscosity), containing 1% antistatic agent, UV curing time 18 seconds.

[0047] B-side adhesive: Rubber-type double-sided textured adhesive (polyester film thickness 32μm, texture depth 0.09mm, with 1.5% added antioxidant).

[0048] Curing conditions: Temperature 68℃, time 9 minutes, humidity 38%.

[0049] Performance testing: Peel strength of side A: 3.2 N / cm (wood panel wall), residual adhesive rate 0.05%.

[0050] Peel strength on side B: 11.5 N / cm (plastic working surface), strength retention rate of 96% in weather resistance test (UV 500h).

[0051] Environmental friendliness: Bio-based content ≥55%, compliant with FSC certification.

[0052] Application scenario: Outdoor billboard shielding, service life ≥ 3 years.

[0053] Example 3: High-elasticity masking paper backing adhesive for mixed fiber substrate Material and process parameters: Crepe paper preparation: Raw materials: wood pulp (50%) + bagasse pulp (50%), freeness 42°SR, paper basis weight 58g / m² 2 .

[0054] Wrinkling process: scraper angle 19°, wrinkling rate 14%.

[0055] Coating treatment: The thin PET film is 20μm thick with a light transmittance of 91%, and the hot-pressing lamination temperature is 94℃ with a pressure of 0.42MPa.

[0056] Adhesive coating: Adhesive A: Modified acrylic adhesive (50% solids content, 2500 mPa·s viscosity), with 0.5% tackifying resin added, thermosetting temperature 78℃.

[0057] B-side adhesive: Fabric texture adhesive (fabric texture density 9 lines / cm) 2 Elastic recovery rate ≥92%, Shore hardness 65A.

[0058] Curing conditions: Temperature 78℃, time 5 minutes, humidity 48%.

[0059] Performance testing: Peel strength of side A: 4.5 N / cm (tile wall), residual adhesive rate 0.04%.

[0060] Peel strength on side B: 12.0 N / cm (glass operating surface), tensile strength: 5.8 kN / m.

[0061] Chemical resistance: Resistant to 50 toluene rubs without peeling.

[0062] Application scenarios: Shielding of 3C electronic components, fitting complex curved surfaces (R angle ≥ 3mm).

[0063] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A method for preparing masking tape backing adhesive that can protect wall coatings, characterized in that, Includes the following steps: (1) Crepe paper is made from plant fiber as raw material through pulping, papermaking and creping processes; (2) A thin PET film is laminated onto the surface of the crepe paper to form a laminated crepe paper; (3) Apply a special curing adhesive to side A (the side in contact with the wall) of the laminated crepe paper; (4) Coat the B side (operating side) of the laminated crepe paper with double-sided polyester film textured double-sided adhesive; (5) Each adhesive layer is cured to obtain the masking tape backing adhesive.

2. The method for preparing masking tape backing adhesive that can protect wall coatings according to claim 1, characterized in that, The plant fiber mentioned in step (1) is wood pulp, bamboo pulp or a mixture of both, and the beating degree is 30-50°SR.

3. The method for preparing masking tape backing adhesive that can protect wall coatings according to claim 1, characterized in that, The paper basis weight of the papermaking process described in step (1) is 50-80 g / m³. 2 The wrinkling process uses a scraper with a scraper angle of 15°-30° and a wrinkling rate of 10%-20%.

4. The method for preparing masking tape backing adhesive that can protect wall coatings according to claim 1, characterized in that, The thin PET film in step (2) has a thickness of 10-20 μm and a light transmittance of ≥90%. It is hot-pressed with the crepe paper at a temperature of 80-100℃ and a pressure of 0.2-0.5 MPa.

5. The method for preparing masking tape backing adhesive that can protect wall coatings according to claim 1, characterized in that, The special curing adhesive mentioned in step (3) is an acrylic adhesive with a solid content of 40%-50%, a viscosity of 1000-3000 mPa·s (25℃), and a curing method of UV curing or heat curing with a curing time of 10-30 seconds.

6. The method for preparing masking tape backing adhesive that can protect wall coatings according to claim 1, characterized in that, The peel strength of the special curing adhesive described in step (3) is 2-5 N / cm (peeling from the cement wall), and there is no residual adhesive after curing.

7. The method for preparing masking tape backing adhesive that can protect wall coatings according to claim 1, characterized in that, In step (4), the polyester film thickness of the double-sided textured double-sided adhesive tape is 20-30 μm, the depth of the texture pattern is 0.05-0.1 mm, and the density is 5-10 stripes / cm. 2 The adhesive layer is a rubber-based acrylic adhesive with a peel strength of 8-12 N / cm (peeling from the working surface).

8. The method for preparing masking tape backing adhesive that can protect wall coatings according to claim 1, characterized in that, In step (4), 0.5%-2% of antistatic agent is added to the adhesive layer of the double-sided polyester film textured double-sided adhesive to prevent dust from adsorbing onto the operating surface.

9. The method for preparing masking tape backing adhesive that can protect wall coatings according to claim 1, characterized in that, The curing process in step (5) is carried out at a temperature of 60-80℃ for 5-10 minutes and at an ambient humidity of 30%-50%.

10. A method for preparing masking tape backing adhesive that can protect wall coatings, as described in any one of claims 1-9, characterized in that, When the A-side adhesive layer is peeled off from the wall, there is no paint residue; when the B-side adhesive layer is peeled off from the work surface, there is no paper tearing; and the overall temperature resistance range is -20℃ to 80℃.