Decorative edge banding tape made of PP (polypropylene) material with high factor value and preparation method of decorative edge banding tape

Abstract

The invention relates to the technical field of edge sealing belts, and mainly relates to a PP decorative edge sealing belt with a high factor value and a preparation method of the PP decorative edge sealing belt. The invention relates to a PP (Polypropylene) material decorative edge banding tape with a high factor value. The PP material decorative edge banding tape comprises an extrusion layer, a priming coat and a glue layer, the extrusion layer is prepared from the following components in parts by mass: 5 to 10 parts of PP-g-MAH modified microcapsules, 0.1 to 1 part of a curing agent, 70 to 80 parts of PP, 0.2 to 0.5 part of PE wax and 10 to 15 parts of a supplementary additive; the PP-g-MAH modified microcapsule is prepared from the following components in parts by mass: 50 to 70 parts of epoxy resin, 20 to 30 parts of urea resin prepolymer, 5 to 10 parts of maleic anhydride grafted polypropylene, 1 to 3 parts of polyvinyl alcohol, 0.1 to 0.3 part of dispersing agent and 80 to 120 parts of water; the bottom coating is formed by drying a bottom coating agent, and the bottom coating agent is a polyurethane bottom coating agent containing an epoxy group and an amino group. The bonding effect and the self-repairing property of the edge sealing tape can be effectively improved.

Description

Technical Field

[0001] This application relates to the field of edge banding technology, and mainly to a decorative edge banding tape made of PP material with a high y-value and its preparation method. Background Technology

[0002] Polypropylene (PP), a general-purpose thermoplastic resin, is widely used in various fields, including furniture, architectural decoration, and automotive interiors, due to its excellent cost-effectiveness, good processing performance, and recyclability. PP edge banding, as an important decorative material, is mainly used to cover the edges of furniture and boards, serving aesthetic, protective, and sealing purposes. However, PP material itself has some inherent defects that limit its application in the high-end edge banding field.

[0003] First, PP is a non-polar material with low surface energy, resulting in poor adhesion to common adhesives (such as acrylates and polyurethanes) and substrates like wood and metal. Traditional edge banding tapes typically use hot melt adhesives or pressure-sensitive adhesives, but due to insufficient interfacial forces between PP and the adhesive, problems such as detachment and cracking easily occur during use, especially in harsh environments such as high temperatures and humidity, where the bond strength decreases more significantly. Currently, the main methods commonly used in industry to improve PP adhesion are as follows: First, surface roughening treatments, such as sanding and chemical etching, increase the surface area to improve mechanical interlocking force, but this method easily damages the PP surface, affecting aesthetics, and the effect is not lasting; second, chemical modification, such as chlorination and grafting, introduces polar groups to increase surface energy, but this method is complex, costly, and may alter the intrinsic properties of PP; third, using a primer to coat the PP surface with an intermediate layer that has good adhesion to both PP and the adhesive, but the choice of primer and the coating process greatly affect the final bonding effect and pose environmental problems such as VOC emissions.

[0004] Secondly, PP material has low hardness and poor scratch resistance, making it susceptible to scratches and wear during use, affecting its appearance and lifespan. Traditional repair methods, such as grinding and polishing, are cumbersome, ineffective, and prone to causing secondary damage.

[0005] Therefore, existing technologies still need to be improved and developed. Summary of the Invention

[0006] In view of the shortcomings of the prior art, the purpose of this application is to provide a decorative edge banding tape made of PP material with a high gluten value and its preparation method, aiming to improve the bonding effect and self-healing property of the decorative edge banding tape made of PP material with a high gluten value.

[0007] The technical solution of this application is as follows: A decorative edge banding tape made of PP material with a high gluten value includes an extrusion layer, a base coating layer, and an adhesive layer; The extruded layer comprises, by weight, the following raw materials: 5-10 parts PP-g-MAH modified microcapsules, 0.1-1 parts curing agent, 70-80 parts PP, 0.2-0.5 parts PE wax, and 10-15 parts supplementary additives. The PP-g-MAH modified microcapsules, by weight, comprise the following raw materials: 50-70 parts epoxy resin, 20-30 parts urea-formaldehyde resin prepolymer, 5-10 parts maleic anhydride-grafted polypropylene, 1-3 parts polyvinyl alcohol, 0.1-0.3 parts dispersant, and 80-120 parts water. The base coating is formed by drying a primer, which is a polyurethane primer containing epoxy groups and amino groups.

[0008] The maleic anhydride groups of the PP-g-MAH modified microcapsules in the extruded layer undergo a ring-opening reaction with the epoxy / amino groups in the primer, generating stable amide bonds and constructing a chemically bonded layer on the non-polar surface of PP. This chemical bonding not only directly enhances the initial bond strength but also forms a physical barrier through the weather-resistant components of the primer (such as polyurethane segments), inhibiting the erosion of the interface by moisture and ultraviolet radiation, achieving durable adhesion under high temperature and high humidity environments. The PP-g-MAH modified microcapsules in the extruded layer are uniformly dispersed in the PP matrix through a melt blending process. Their maleic anhydride groups form covalent bonds with the polar groups in the primer, significantly improving interfacial adhesion. Simultaneously, the epoxy and amino groups in the primer can chemically react with PP-g-MAH to form a three-dimensional network structure, enhancing interfacial toughness.

[0009] When the sealing tape is damaged, the PP-g-MAH modified microcapsules rupture due to stress concentration at the crack tip, releasing the encapsulated epoxy resin. The epoxy resin and curing agent undergo a rapid cross-linking polymerization reaction at the crack, generating a three-dimensional network structure that fills the crack and restores the material's integrity. This process not only repairs physical damage but also enhances interfacial bonding through chemical bonding—the epoxy groups of the epoxy resin undergo a ring-opening reaction with the amino groups in the primer to form covalent bonds, while the maleic anhydride groups in PP-g-MAH form amide bonds with the active amino groups in the curing agent, significantly improving the interfacial bonding strength.

[0010] Furthermore, the preparation method of the PP-g-MAH modified microcapsules includes the following steps: Step a: Prepare the urea-formaldehyde resin prepolymer; Step b: Heat the epoxy resin and the maleic anhydride-grafted polypropylene to 75-85°C and stir for 15-45 minutes to obtain the oil phase; Step c: Add the polyvinyl alcohol and the dispersant to water, heat to 85-95°C, and stir for 0.5-1.5 hours to obtain an aqueous phase; Step d: The oil phase and the aqueous phase are mixed and emulsified for 30-60 minutes to form an emulsion; Step e: The urea-formaldehyde resin prepolymer and the emulsion are mixed and stirred for 30-60 minutes; then stirred and reacted at 50-60℃ for 2-4 hours to obtain microcapsule slurry; Step f: Cool the microcapsule slurry, wash and dry it to obtain the PP-g-MAH modified microcapsules.

[0011] The blending of epoxy resin and maleic anhydride-grafted polypropylene in the oil phase ensures the compatibility of PP-g-MAH modified microcapsules with the PP matrix. In the aqueous phase, the synergistic effect of polyvinyl alcohol and dispersant forms a stable emulsion. The emulsification process controls the particle size distribution of microcapsules and avoids uneven repair caused by agglomeration.

[0012] The condensation reaction of urea-formaldehyde resin prepolymer at 50-60℃ forms a semi-permeable shell, which ensures the stability of encapsulation and allows the PP-g-MAH modified microcapsules to be released in a controlled manner when damaged.

[0013] In step e, the mixing and stirring of the prepolymer and emulsion achieves uniform coating of the shell layer, avoiding delayed rupture due to excessive thickness in some areas or premature leakage due to excessive thinness.

[0014] Furthermore, the preparation of the urea-formaldehyde resin prepolymer includes the following steps: Step a1: Adjust the pH of the formaldehyde solution to 8.0-8.5, add urea, and the molar ratio of formaldehyde to urea is (1.7-1.9):1; Step a2: Heat to 80-85℃ and react for 1.5-2 hours; Step a3: Cool down to below 50℃, adjust the pH to 5.0-5.5, and continue the reaction for 1-1.5 hours; Step a4: Concentrate and cool at 100-150 rpm and 55-65°C to obtain the urea-formaldehyde resin prepolymer.

[0015] Furthermore, the curing agent comprises, by weight, the following raw materials: 3-7 parts nano-silica, 60-80 parts anhydrous ethanol, 1-3 parts silane coupling agent, 3-7 parts diethylenetriamine, and 0.1-1 parts water.

[0016] The shell material of the PP-g-MAH modified microcapsules (such as urea-formaldehyde resin prepolymer) is precisely controlled in terms of particle size and loading rate through an emulsification-coating process, ensuring the controlled release of the PP-g-MAH modified microcapsules when damaged. The curing agent is a silane coupling agent used to modify diethylenetriamine, forming a slow-release system that reduces migration and loss caused by direct exposure, while increasing the contact area with epoxy resin and accelerating the cross-linking reaction. During the repair process, the rigidity of nano-silica inhibits the plastic deformation of PP, the flexible segments of diethylenetriamine improve toughness, and the chemically bonded interface enables effective stress transfer, enhancing self-healing performance. In addition, the self-healing process and the improvement of adhesive strength form a positive synergy: the repair agent not only repairs cracks but also strengthens the interfacial bonding between the substrate and the primer through chemical bonding, forming a dual effect of "repair-strengthening," significantly improving the overall durability and reliability of the edge banding.

[0017] Furthermore, the preparation method of the curing agent includes the following steps: Step A: The nano-silica and the anhydrous ethanol are ultrasonically dispersed to form a suspension; Step B: Add the silane coupling agent and the water to the suspension, and stir for 1.5-3.5 hours to obtain the modified suspension; Step C: Add diethylenetriamine to the modified suspension and stir for 1.5-2.5 hours to obtain the reaction solution; Step D: The reaction solution is transferred and centrifuged, washed, dried, and the precipitate is dried to obtain the curing agent.

[0018] A sustained-release system is constructed by coating diethylenetriamine (DETA) with nano-silica to achieve a balance between curing activity and stability. Nano-silica (particle size 20-50nm) serves as a carrier, and amino groups are introduced through surface modification with a silane coupling agent (such as KH-550) to form chemical bonds with DETA, preventing substrate aging caused by curing agent migration.

[0019] Anhydrous ethanol is used as a solvent to ensure uniform dispersion of the system, while diethylenetriamine, as a multifunctional curing agent, undergoes a rapid cross-linking reaction with epoxy resin after the microcapsules rupture, achieving immediate repair of cracks.

[0020] The bridging effect of the silane coupling agent enhances the inorganic-organic interfacial bonding force, ensuring uniform dispersion of the curing agent in the PP matrix (dispersion < 5 μm) and improving repair efficiency. This design, through a synergistic mechanism of "encapsulation-slow release-crosslinking," enables the sealing tape to maintain stable repair performance over a wide temperature range, significantly outperforming the durability of traditional external self-healing systems.

[0021] Furthermore, the supplementary additive includes talc.

[0022] Furthermore, the nano-silica has a particle size of 20-50 nm and a specific surface area of ​​≥100 m² / g.

[0023] Furthermore, the silane coupling agent is γ-aminopropyltriethoxysilane.

[0024] The synergy between the curing agent and PP-g-MAH modified epoxy resin microcapsules is mainly achieved through chemical bonding and interfacial reinforcement mechanisms. After SiO2 nanoparticles are modified with KH-550, amino groups are introduced onto their surface. These amino groups then react with DETA to form a coating layer rich in active amino groups. When the PP-g-MAH modified epoxy resin microcapsules rupture, they can undergo a ring-opening reaction with the epoxy groups in the released epoxy resin. At the same time, the maleic anhydride groups in PP-g-MAH can also form amide bonds with the amino groups on the surface of the curing agent, which significantly improves the compatibility between the inorganic filler and the polypropylene matrix, reduces phase separation, and enhances interfacial bonding.

[0025] In terms of self-healing function, when the edge sealing material is damaged, the microcapsules rupture to release epoxy resin repair agent. The amino groups in the curing agent can accelerate the cross-linking reaction of epoxy resin. The nanoparticles are uniformly dispersed around the crack to provide more active sites, shortening the repair time and improving the repair efficiency. The mechanical properties are improved by the rigidity of SiO2 nanoparticles inhibiting the plastic deformation of polypropylene, the flexible segments of DETA improving toughness, and the chemical bonding interface realizing the effective transfer of stress. The enhanced thermal stability is achieved through the thermal conduction barrier effect of SiO2 particles and the high heat resistance of the epoxy-DETA cross-linking network.

[0026] This application also provides a method for preparing a decorative edge banding tape made of PP material with a high factor value, comprising the following steps: Step 1: The PP-g-MAH modified microcapsules, the PP, the PE wax, and the supplementary additives are melt-blended, and then the curing agent is added and blended to obtain the extruded material; Step 2: The extruded material is extruded and molded to obtain an extruded layer; Step 3: The primer is coated on one side of the extruded layer; the primer, after drying, becomes the base layer. Step 4: After the primer dries, apply adhesive to the back of the coating using a corona discharge method; after drying, the decorative edge banding tape with a high glyph value is obtained. The glue, after drying, becomes the glue layer.

[0027] Furthermore, during extrusion, the extrusion temperature is 170-190℃, the die temperature is 200-215℃, the extrusion speed is 750-850m / h, and the cooling water temperature is 15-30℃.

[0028] Compared with the prior art, this application has the following beneficial effects: 1. The maleic anhydride groups in the PP-g-MAH modified microcapsules undergo a ring-opening reaction with the epoxy / amino groups of the primer, generating stable amide and ester bonds, thus constructing a high-density chemically bonded layer on the non-polar surface of PP. This chemical bonding not only directly enhances the initial peel strength but also forms a three-dimensional network barrier through the weather-resistant components of the primer, effectively blocking moisture and ultraviolet radiation from eroding the interface and ensuring the durability of the bond strength under high temperature and high humidity conditions.

[0029] 2. PP-g-MAH modified microcapsules achieve efficient self-repair through precise synergy of "microcapsule rupture - repair agent release - chemical reaction". When the sealing tape is damaged by external force, the microcapsule shell (such as urea-formaldehyde resin prepolymer) ruptures due to stress concentration from cracks, releasing the internally encapsulated epoxy resin and curing agent (diethylenetriamine coated with nano silica).

[0030] The epoxy groups of the epoxy resin rapidly undergo cross-linking polymerization with the active amino groups in the curing agent, generating a three-dimensional network structure to fill the cracks. The semi-permeable shell design of the microcapsules ensures controlled release of the repair agent, avoiding pre-curing issues; the silane coupling agent-modified nano-silica carrier chemically bonds and fixes the curing agent, reducing migration and loss, and extending the repair life. This mechanism enables the sealing tape to undergo multiple repairs, significantly improving material durability.

[0031] 3. The maleic anhydride groups of PP-g-MAH not only form covalent bonds with the primer to enhance the initial bonding strength, but also generate amide bonds with the released curing agent during the self-healing process, strengthening the interfacial bonding force after repair. During repair, the epoxy groups of the epoxy resin react with the amino groups of the primer to form a cross-linked network, while the reaction between PP-g-MAH and the curing agent further strengthens the interface, achieving the dual effect of "repair as strengthening".

[0032] Furthermore, high surface energy promotes uniform wetting of cracks by PP-g-MAH modified microcapsules, the rigidity of nano-silica inhibits PP plastic deformation, and the flexible segments of diethylenetriamine improve toughness. These three factors work synergistically to achieve effective stress transfer and rapid repair. This synergistic mechanism ensures the edge banding maintains stable performance, and the bond strength does not decrease after repair, meeting the performance requirements of high-end decorative materials. Detailed Implementation

[0033] To facilitate understanding of this application, the following embodiments are provided. Those skilled in the art should understand that these embodiments are merely illustrative and should not be construed as limiting the scope of this application.

[0034] This application provides a decorative edge banding tape made of PP material with a high coefficient of performance, including an extrusion layer, a base coating layer, and an adhesive layer; The extruded layer, by weight, includes the following raw materials: 5-10 parts PP-g-MAH modified microcapsules, 0.1-1 parts curing agent, 70-80 parts PP, 0.2-0.5 parts PE wax, and 10-15 parts supplementary additives.

[0035] PP is commercially available; homopolymer or copolymer PP is preferred. Specifically, it is BorShape FB1120 from Borealis.

[0036] PE wax is commercially available and has no special requirements.

[0037] The supplementary additive is talc.

[0038] PP-g-MAH modified microcapsules, by weight, include the following raw materials: 50-70 parts epoxy resin, 20-30 parts urea-formaldehyde resin prepolymer, 5-10 parts maleic anhydride grafted polypropylene (PP-g-MAH), 1-3 parts polyvinyl alcohol, 0.1-0.3 parts dispersant, and 80-120 parts water.

[0039] The epoxy resin is commercially available, with E-51 being the preferred choice.

[0040] Polyvinyl alcohol is commercially available, with preferred specifications being 85-90% degree of alcoholysis and 78,000-82,000 molecular weight.

[0041] The preferred dispersant is sodium dodecyl sulfate.

[0042] The preparation method of PP-g-MAH modified microcapsules includes the following steps: Step a: Prepare urea-formaldehyde resin prepolymer, including the following steps: Step a1: Add 37% formaldehyde solution to the reactor, adjust the pH to 8.0-8.5 with ammonia, and then add urea, controlling the molar ratio of formaldehyde to urea to be (1.7-1.9):1.

[0043] Step a2: Heat to 80-85℃ and react for 1.5-2 hours.

[0044] Step a3: Cool down to below 50°C, adjust the pH to 5.0-5.5 with formic acid, and continue the reaction for 1-1.5 hours.

[0045] Step a4: Vacuum concentrate the product at 100-150 rpm and 55-65℃ until the solid content is 50±2%, then cool it to room temperature to obtain the urea-formaldehyde resin prepolymer.

[0046] Step b: Heat the epoxy resin and PP-g-MAH to 75-85℃ and stir for 15-45 minutes to dissolve the PP-g-MAH in the epoxy resin, thus obtaining the oil phase.

[0047] Step c: Add polyvinyl alcohol and dispersant to deionized water, heat to 85-95℃, and stir for 0.5-1.5 hours to dissolve polyvinyl alcohol and dispersant in water to obtain an aqueous phase.

[0048] Step d: Slowly add the oil phase to the aqueous phase and emulsify with a high-speed stirrer at 7500-8500 rpm for 30-60 minutes to form a uniform emulsion.

[0049] Step e: Add the urea-formaldehyde resin prepolymer to the emulsion and continue stirring for 30-60 minutes. Then stir and react at 50-60℃ for 2-4 hours to solidify the urea-formaldehyde resin, forming microcapsules, and obtain the microcapsule slurry.

[0050] Step f: Cool the microcapsule slurry to room temperature, wash it several times with deionized water, and then dry it in a vacuum freeze dryer for 18-36 hours to obtain PP-g-MAH modified microcapsules.

[0051] The raw materials for preparing the curing agent, by mass parts, include the following: 3-7 parts nano silica (particle size 20-50nm, specific surface area ≥100m² / g), 60-80 parts anhydrous ethanol, 1-3 parts silane coupling agent, 3-7 parts diethylenetriamine, and 0.1-1 parts deionized water.

[0052] The preferred silane coupling agent is γ-aminopropyltriethoxysilane (KH-550, purity ≥95%). The preparation method of the curing agent includes the following steps: Step A: Add nano-silica to anhydrous ethanol and ultrasonically disperse for 20-40 minutes (power 200-400W, pulse mode: on for 4-6s / off for 1-3s) to break up soft agglomerates and form a uniform suspension.

[0053] Step B: While maintaining a stirring speed of 300-500 rpm, add KH-550 to the suspension and slowly add deionized water dropwise over a period of 4-6 minutes.

[0054] Stir at room temperature for 20-40 minutes to promote the hydrolysis of KH-550 into silanol groups (-Si-OH).

[0055] Continue stirring for 1.5-2.5 hours to allow the silanol groups to undergo a condensation reaction with the hydroxyl groups (-OH) on the surface of silicon dioxide, forming Si-O-Si bonds and introducing amino groups.

[0056] A modified suspension was obtained.

[0057] Step C: Increase the rotation speed to 400-600 rpm, add DETA to the modified suspension, and stir at room temperature for 1.5-2.5 hours to obtain the reaction solution.

[0058] The amino groups in DETA combine with the amino groups on the silica surface through hydrogen bonds or chemical bonds (such as amide bonds) to form a stable coating layer.

[0059] Step D: Transfer the reaction solution to a centrifuge tube and centrifuge at 9000-11000 rpm for 10-20 minutes. Discard the supernatant (containing unreacted DETA).

[0060] The precipitate was washed multiple times with anhydrous ethanol, and centrifuged (9000-11000 rpm, 5-15 minutes) after each wash to completely remove residual KH-550 and DETA.

[0061] The washed precipitate was placed in a vacuum drying oven and dried at 55-65℃ for 8-24 hours to obtain the curing agent.

[0062] Primer, commercially available, preferably a polyurethane primer containing epoxy and amino groups. For example, BASF Basonol PU 4200.

[0063] This application also provides a method for preparing a decorative edge banding tape made of PP material with a high y-value, comprising the following steps: Step 1: PP-g-MAH modified microcapsules, PP, PE wax, and supplementary additives are added to a twin-screw extruder for melt blending, and then a curing agent is added for blending to obtain the extruded material.

[0064] Step 2: The extruded material is extruded and formed by a twin-screw extruder to obtain an extruded layer.

[0065] The single-screw extrusion temperature is 170-190℃, the die temperature is 200-215℃, the extrusion speed is 800m / h, and the cooling water temperature is controlled at 15-30℃.

[0066] Step 3: Apply a primer to one side of the extruded layer, with the primer application amount controlled at 5-10 g / m². 2 .

[0067] The primer layer is formed after the primer dries.

[0068] Step 4: After the primer dries, apply adhesive to the back of the coating using a corona discharge process. After drying at room temperature, roll it up to obtain a decorative edge-sealing tape made of PP material with a high y-value.

[0069] After the glue dries, it becomes the glue layer.

[0070] If a pattern needs to be printed, after drying at room temperature and rewinding, the texture and pattern can be printed by a roller coating printing machine.

[0071] The present application will be further described below through specific embodiments.

[0072] Example 1 A decorative edge banding tape made of PP material with a high gluten value, comprising, in sequence, an extrusion layer, a base coating layer, and an adhesive layer.

[0073] The extruded layer comprises the following raw materials: 8kg PP-g-MAH modified microcapsules, 0.3kg curing agent, 75kg PP, 0.2-0.5kg PE wax, 10-15kg supplementary additives, and primer.

[0074] The PP is commercially available; the specific model is BorShape FB1120 from Borealis.

[0075] The supplementary additive is talc.

[0076] PP-g-MAH modified microcapsules comprise the following raw materials: 60 kg epoxy resin, 25 kg urea-formaldehyde resin prepolymer, 7.5 kg maleic anhydride-grafted polypropylene (PP-g-MAH), 2 kg polyvinyl alcohol, 0.2 kg dispersant, and 100 kg water.

[0077] The epoxy resin is commercially available, specifically E-51.

[0078] Maleic anhydride-grafted polypropylene is commercially available, specifically ExxonMobil PO1015.

[0079] Polyvinyl alcohol is commercially available, with specific specifications of 88% degree of alcoholysis and 80,000 molecular weight.

[0080] The dispersant is sodium dodecyl sulfate.

[0081] The preparation method of PP-g-MAH modified microcapsules includes the following steps: Step a: Prepare urea-formaldehyde resin prepolymer, including the following steps: Step a1: Add 37% formaldehyde solution to the reaction vessel, adjust the pH to 8.2 with ammonia, and then add urea, controlling the molar ratio of formaldehyde to urea to be 1.8:1.

[0082] Step a2: Heat to 82°C and react for 2 hours.

[0083] Step a3: Cool to 50°C, adjust pH to 5.2 with formic acid, and continue the reaction for 1.5 hours.

[0084] Step a4: Vacuum concentrate the product at 150 rpm and 60°C until the solid content is 50 ± 2%, then cool it to room temperature to obtain the urea-formaldehyde resin prepolymer.

[0085] Step b: Heat the epoxy resin and PP-g-MAH to 80°C and stir for 30 minutes to dissolve the PP-g-MAH in the epoxy resin, thus obtaining the oil phase.

[0086] Step c: Add polyvinyl alcohol and dispersant to deionized water, heat to 90°C, and stir for 1 hour to dissolve polyvinyl alcohol and dispersant in water to obtain an aqueous phase.

[0087] Step d: Slowly add the oil phase to the aqueous phase and emulsify for 30 minutes at 8000 rpm using a high-speed stirrer to form a uniform emulsion.

[0088] Step e: Add the urea-formaldehyde resin prepolymer to the emulsion and continue stirring for 30 minutes. Then stir and react at 55°C for 3 hours to solidify the urea-formaldehyde resin, forming microcapsules, and obtain the microcapsule slurry.

[0089] Step f: Cool the microcapsule slurry to room temperature, wash it three times with deionized water, and then dry it in a vacuum freeze dryer for 24 hours to obtain PP-g-MAH modified microcapsules.

[0090] The curing agent comprises the following raw materials: 5 kg nano silica (particle size 20-50 nm, specific surface area 100 m² / g), 75 kg anhydrous ethanol, 1.5 kg γ-aminopropyltriethoxysilane (KH-550, purity ≥95%), 5 kg diethylenetriamine, and 0.3 kg deionized water.

[0091] The preparation method of the curing agent includes the following steps: Step A: Add nano-silica to anhydrous ethanol and ultrasonically disperse for 30 minutes (power 300W, pulse mode: 5s on / 2s off) to break up soft agglomerates and form a uniform suspension.

[0092] Step B: While maintaining a stirring speed of 400 rpm, add KH-550 to the suspension, and slowly add deionized water dropwise over a period of 5 minutes.

[0093] The mixture was stirred at room temperature for 2 hours and 30 minutes to obtain the modified suspension.

[0094] Step C: Increase the rotation speed to 500 rpm, add DETA to the modified suspension, and stir at room temperature for 2 hours to obtain the reaction solution.

[0095] Step D: Transfer the reaction solution to a centrifuge tube, centrifuge at 10,000 rpm for 15 minutes, and discard the supernatant.

[0096] The precipitate was washed three times with anhydrous ethanol, and centrifuged (10,000 rpm, 10 minutes) after each wash to completely remove residual KH-550 and DETA.

[0097] The washed precipitate was placed in a vacuum drying oven and dried at 60°C for 12 hours to obtain the curing agent.

[0098] A commercially available primer, preferably a polyurethane primer containing epoxy and amino groups. In this example, BASF's Basonol PU 4200 is used.

[0099] There are no special requirements for the adhesive; commercially available PP-specific adhesive is preferred.

[0100] This application also provides a method for preparing a decorative edge banding tape made of PP material with a high y-value, comprising the following steps: Step 1: PP-g-MAH modified microcapsules, PP, PE wax, and supplementary additives are added to a twin-screw extruder for melt blending, and then a curing agent is added for blending to obtain the extruded material.

[0101] Step 2: The extruded material is extruded and formed by a twin-screw extruder to obtain an extruded layer.

[0102] The preferred single-screw extrusion temperature is 170-190℃, die temperature is 200-215℃, extrusion speed is 800m / h, and cooling water temperature is controlled at 15-30℃. Specific adjustments should be made based on actual production conditions.

[0103] Step 3: Apply a primer to one side of the extruded layer, controlling the primer application amount to 8g / m². 2 .

[0104] The primer layer is formed after the primer dries.

[0105] Step 4: After the primer dries, apply adhesive to the back of the coating using a corona discharge process. After drying at room temperature, roll it up to obtain a decorative edge-sealing tape made of PP material with a high y-value.

[0106] After the glue dries, it becomes the glue layer.

[0107] Perform performance testing on the product: 1. Self-healing efficiency test: Scratches were created on the surface of the edge banding using a scratching method, with a depth of 0.2 mm and a width of 0.1 mm. The scratched edge banding was placed in an environment of 25°C, and the repair status of the scratches was recorded after different times (24 hours, 48 ​​hours, and 72 hours).

[0108] The degree of repair of the scratches was observed using an optical microscope, and the width of the scratches was measured.

[0109] Self-repair rate (%) = (Initial scratch width - Repaired scratch width) / Initial scratch width × 100% Test results: 72% after 24 hours, 88% after 48 hours, and 96% after 72 hours.

[0110] 2. Peel strength test: According to GB / T 2792-2014 "Test method for peel strength of adhesive tape", the edge banding tape is adhered to the substrate and peeled at a constant speed, and the peel force is recorded; the peel angle is 180°.

[0111] Test result: 22 N / cm.

[0112] 3. Tensile strength test: Use a universal testing machine (such as a PP tape tensile testing machine) to test the tensile strength according to GB / T 1040 standard.

[0113] Test result: 35MPa.

[0114] 4. Durability test: The edge banding tape was placed in an 80℃ oven to accelerate aging, and test samples of edge banding tape aged for 3 days, 7 days, and 14 days were obtained respectively.

[0115] Repeat the "self-healing efficiency test" on the test sample 1 and record the repair status of the scratches after 24 hours; repeat the test 2 and 3 on the 14-day edge banding test sample and record the test results.

[0116] Test results: (1) Self-repair rate: 70% in 3 days, 67% in 7 days, and 65% in 14 days.

[0117] (2) Peel strength: 19 N / cm.

[0118] (3) Tensile strength: 33MPa.

[0119] 5. Dyne value: 42.

[0120] Example 2 A decorative edge banding tape made of PP material with a high y-value differs from Example 1 in that the curing agent of the extruded layer is commercially available diethylenetriamine.

[0121] Test results: 1. Self-repair efficiency test: 70% in 24h, 76% in 48h, and 88% in 72h.

[0122] 2. Peel strength test: 17 N / cm.

[0123] 3. Tensile strength test: 30MPa.

[0124] 4. Durability test: (1) Self-repair rate: 62% in 3 days, 58% in 7 days, and 52% in 14 days.

[0125] (2) Peel strength: 14 N / cm.

[0126] (3) Tensile strength: 25MPa.

[0127] Example 3 A decorative edge banding tape made of PP material with a high y-value differs from Example 1 in that the nano-silica in the raw materials for preparing the curing agent is omitted in the extruded layer.

[0128] Test results: 1. Self-repair efficiency test: 73% in 24h, 80% in 48h, and 91% in 72h.

[0129] 2. Peel strength test: 20 N / cm.

[0130] 3. Tensile strength test: 31MPa.

[0131] 4. Durability test: (1) Self-repair rate: 65% in 3 days, 62% in 7 days, and 58% in 14 days.

[0132] (2) Peel strength: 16 N / cm.

[0133] (3) Tensile strength: 26MPa.

[0134] Example 4 A decorative edge banding tape made of PP material with a high y-value differs from Example 1 in that the extruded layer comprises the following raw materials: 5 kg PP-g-MAH modified microcapsules, 0.1 kg curing agent, 70 kg PP, 0.2 kg PE wax, and 10 kg supplementary additives.

[0135] Example 5 A decorative edge banding tape made of PP material with a high y-value differs from Example 1 in that the extruded layer comprises the following raw materials: 10 kg PP-g-MAH modified microcapsules, 1 kg curing agent, 80 kg PP, 0.5 kg PE wax, and 15 kg supplementary additives.

[0136] Comparative Example 1 A decorative edge-sealing tape made of PP material differs from Example 1 in that maleic anhydride-grafted polypropylene is omitted from the raw materials for preparing PP-g-MAH modified microcapsules.

[0137] Test results: 1. Self-repair efficiency test: 68% for 24h, 75% for 48h, and 84% for 72h.

[0138] 2. Peel strength test: 15.5 N / cm.

[0139] 3. Tensile strength test: 26MPa.

[0140] 4. Durability test: (1) Self-repair rate: 60% in 3 days, 55% in 7 days, and 49% in 14 days.

[0141] (2) Peel strength: 12.5 N / cm.

[0142] (3) Tensile strength: 22MPa.

[0143] Comparative Example 2 A decorative edge banding tape made of PP material differs from Example 1 in that the PP-g-MAH modified microcapsules in the raw material of the extrusion layer are omitted.

[0144] Test results: 1. Self-repair efficiency test: 0.5% for 24h, 1% for 48h, and 1.5% for 72h.

[0145] 2. Peel strength test: 12N / cm.

[0146] 3. Tensile strength test: 21MPa.

[0147] 4. Durability test: (1) Self-repair rate: 0 for 3 days, 0 for 7 days, and 0 for 14 days.

[0148] (2) Peel strength: 10 N / cm.

[0149] (3) Tensile strength: 16.5 MPa.

[0150] According to the test data, compared with the edge banding tapes of Examples 1-3 and Comparative Example 1, the PP decorative edge banding tape of Comparative Example 2 has almost no self-healing ability, lower peel strength and tensile strength, and poor durability. This indicates that the PP-g-MAH modified microcapsules play an important role in the system.

[0151] While the PP decorative edge banding tape of Comparative Example 1 exhibits better self-healing properties than Comparative Example 2, and its peel strength, tensile strength, and durability are also acceptable, its overall performance is still significantly inferior to that of Example 1. Example 2, based on Example 1, uses a commercially available curing agent. Example 2 shows some differences compared to Example 1 in terms of self-healing, adhesion, and durability. However, the performance of Example 2 is slightly better than that of Comparative Example 1.

[0152] Therefore, it can be concluded that the use of PP-g-MAH modified microcapsules can improve the performance of PP decorative edge banding tape with high gen values; on this basis, if the use of curing agent can be further limited and it can be used in combination with PP-g-MAH modified microcapsules, the performance of the edge banding tape can be further significantly improved.

[0153] In other words, although PP-g-MAH modified microcapsules play an important role in the system, and PP-g-MAH is also very important, it is not the PP-g-MAH material alone that can improve the performance in all aspects. PP-g-MAH plays an important bridging role, which enables various synergistic processes to proceed smoothly, thereby improving the performance of PP decorative edge banding tape with high y-value.

[0154] Example 3 differs from Example 1 in that the raw materials used to prepare the curing agent are changed. Test data shows that the performance improvements in Example 3 are not as significant as those in Example 1.

[0155] It should be understood that the application of this application is not limited to the examples above. Those skilled in the art can make improvements or modifications based on the above description, and all such improvements and modifications should fall within the protection scope of this application.

Claims

1. A decorative edge banding tape made of PP material with a high coefficient of performance, characterized in that, Includes extrusion layer, base coat, and adhesive layer; The extruded layer comprises, by weight, the following raw materials: 5-10 parts PP-g-MAH modified microcapsules, 0.1-1 parts curing agent, 70-80 parts PP, 0.2-0.5 parts PE wax, and 10-15 parts supplementary additives. The PP-g-MAH modified microcapsules, by weight, comprise the following raw materials: 50-70 parts epoxy resin, 20-30 parts urea-formaldehyde resin prepolymer, 5-10 parts maleic anhydride-grafted polypropylene, 1-3 parts polyvinyl alcohol, 0.1-0.3 parts dispersant, and 80-120 parts water. The base coating is formed by drying a primer, which is a polyurethane primer containing epoxy groups and amino groups.

2. The decorative edge banding tape made of PP material with a high glyph value according to claim 1, characterized in that, The preparation method of the PP-g-MAH modified microcapsules includes the following steps: Step a: Prepare the urea-formaldehyde resin prepolymer; Step b: Heat the epoxy resin and the maleic anhydride-grafted polypropylene to 75-85°C and stir for 15-45 minutes to obtain the oil phase; Step c: Add the polyvinyl alcohol and the dispersant to water, heat to 85-95°C, and stir for 0.5-1.5 hours to obtain an aqueous phase; Step d: The oil phase and the aqueous phase are mixed and emulsified for 30-60 minutes to form an emulsion; Step e: The urea-formaldehyde resin prepolymer and the emulsion are mixed and stirred for 30-60 minutes; then stirred and reacted at 50-60℃ for 2-4 hours to obtain microcapsule slurry; Step f: Cool the microcapsule slurry, wash and dry it to obtain the PP-g-MAH modified microcapsules.

3. The decorative edge banding tape made of PP material with a high glyph value according to claim 2, characterized in that, The preparation of the urea-formaldehyde resin prepolymer includes the following steps: Step a1: Adjust the pH of the formaldehyde solution to 8.0-8.5, add urea, and the molar ratio of formaldehyde to urea is (1.7-1.9):1; Step a2: Heat to 80-85℃ and react for 1.5-2 hours; Step a3: Cool down to below 50℃, adjust the pH to 5.0-5.5, and continue the reaction for 1-1.5 hours; Step a4: Concentrate and cool at 100-150 rpm and 55-65°C to obtain the urea-formaldehyde resin prepolymer.

4. The decorative edge banding tape made of PP material with a high glyph value according to claim 1, characterized in that, The curing agent comprises, by weight, the following raw materials: 3-7 parts nano silica, 60-80 parts anhydrous ethanol, 1-3 parts silane coupling agent, 3-7 parts diethylenetriamine, and 0.1-1 parts water.

5. The decorative edge banding tape made of PP material with a high glyph value according to claim 4, characterized in that, The preparation method of the curing agent includes the following steps: Step A: The nano-silica and the anhydrous ethanol are ultrasonically dispersed to form a suspension; Step B: Add the silane coupling agent and the water to the suspension, and stir for 1.5-3.5 hours to obtain the modified suspension; Step C: Add diethylenetriamine to the modified suspension and stir for 1.5-2.5 hours to obtain the reaction solution; Step D: The reaction solution is transferred and centrifuged, washed, dried, and the precipitate is dried to obtain the curing agent.

6. The decorative edge banding tape made of PP material with a high glyph value according to claim 1, characterized in that, The supplementary additives include talc.

7. The decorative edge banding tape made of PP material with a high glyph value according to claim 1, characterized in that, The nano-silica has a particle size of 20-50 nm and a specific surface area of ​​≥100 m² / g.

8. The decorative edge banding tape made of PP material with a high glyph value according to claim 1, characterized in that, The silane coupling agent is γ-aminopropyltriethoxysilane.

9. A method for preparing a decorative edge banding tape made of PP material with a high coefficient of performance as described in any one of claims 1-8, characterized in that, Includes the following steps: Step 1: The PP-g-MAH modified microcapsules, the PP, the PE wax, and the supplementary additives are melt-blended, and then the curing agent is added and blended to obtain the extruded material; Step 2: The extruded material is extruded and molded to obtain an extruded layer; Step 3: The primer is coated on one side of the extruded layer; the primer, after drying, becomes the base layer. Step 4: After the primer dries, apply adhesive to the back of the coating using a corona discharge method; after drying, the decorative edge banding tape with a high glyph value is obtained. The glue, after drying, becomes the glue layer.

10. The method for preparing PP material decorative edge banding tape with a high coefficient of performance according to claim 9, characterized in that, During extrusion, the extrusion temperature is 170-190℃, the die temperature is 200-215℃, the extrusion speed is 750-850m / h, and the cooling water temperature is 15-30℃.