A flexible moldable technology plate and a method of making the same

Abstract

This application relates to the field of engineered wood panel manufacturing technology, and discloses a flexible, shapeable technological board and its preparation method. The technological board comprises two layers of reconstituted decorative veneers and a modified polyolefin adhesive film layer located between them. The adhesive film layer is made of metallocene propylene-based elastomer, polyolefin elastomer, maleic anhydride-grafted polyolefin initiator, crosslinking aid, and silane coupling agent. The preparation method includes: coating the surface of resin particles with liquid-phase additives, and obtaining an adhesive film with latent reactive activity through low-temperature extrusion casting; stacking the veneers and adhesive film layers, initiating crosslinking reaction and interfacial bonding through high-temperature hot pressing, and then holding the pressure and cooling for shaping. This invention solves the problems of high formaldehyde content and brittleness of traditional adhesives and poor heat resistance of ordinary thermoplastic films. The resulting board has excellent flexibility, heat creep resistance, and water-resistant bonding strength, meeting the requirements for irregular curved surface shaping.

Description

Technical Field

[0001] This invention relates to the field of engineered wood panel manufacturing technology, specifically to a flexible, shapeable technological panel and its preparation method. Background Technology

[0002] Reconstituted decorative materials, also known as engineered wood, are new types of materials made from fast-growing timber through processes such as rotary cutting, bleaching, dyeing, and reconstituted gluing. They not only correct inherent defects in natural wood such as knots and color variations, but also greatly improve wood utilization and possess the advantage of simulating the textures of precious woods. With the upgrading of the whole-house customization and interior decoration industries, the market demand for engineered wood panels in complex scenarios such as irregular curved surfaces and column cladding is increasing, placing higher requirements on the processing adaptability of materials.

[0003] The manufacturing of existing reconstituted decorative panels mainly relies on urea-formaldehyde resin or phenolic resin as adhesives. These thermosetting adhesives dominate the market due to their low cost and high bonding strength. To address the formaldehyde release issue associated with these adhesives, some processes are attempting to introduce thermoplastic polyolefin films to replace liquid adhesives. These films are then laminated and bonded to the veneers using a heating and melting process, aiming to achieve formaldehyde-free production of the panels and impart certain flexibility characteristics.

[0004] However, in practical applications, the existing technologies, after curing urea-formaldehyde or phenolic resins, form a network structure that is too rigid and brittle. When subjected to small-curvature bending, it is difficult to deform synchronously with the wood, easily leading to interlayer cracking or surface damage. While conventional thermoplastic polyolefin films offer flexibility, their heat resistance is a weakness; the lack of a cross-linked structure results in a low softening point, making them prone to creep slippage and blistering during subsequent high-temperature veneer or baking processes. Non-polar polyolefins and polar wood naturally have different interfacial energies, making simple physical bonding insufficient to withstand humid and hot environments, resulting in rapid attenuation of bond strength. Therefore, this invention provides a flexible, shapeable technological board and its preparation method to address the shortcomings of existing technologies. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a flexible, shapeable technological board and its preparation method, which solves the problems of existing reconstituted decorative boards that typically use urea-formaldehyde resin or phenolic resin as adhesives, resulting in high formaldehyde release, brittle adhesive layers, and inability to meet the requirements of irregular curved surface shaping.

[0006] To achieve the above objectives, the present invention provides the following technical solution: The first aspect of this invention provides a flexible, shapeable technology board, comprising two layers of reconstituted decorative veneers and a modified polyolefin film layer located between the two layers of reconstituted decorative veneers, the modified polyolefin film layer being made from raw materials comprising the following parts by weight: Metallocene propylene-based elastomer: 55-75 parts; Polyolefin elastomer: 20-30 parts; Maleic anhydride-grafted polyolefin: 5-15 parts; Peroxide initiator: 0.15-0.25 parts; Crosslinking aid: 0.6-1.0 parts; Vinyltrimethoxysilane: 0.3-0.5 parts; Polyethylene wax: 2-3 parts; Calcium pimecronate: 0.15-0.3 parts.

[0007] By employing the above technical solution, this invention utilizes a metallocene propylene-based elastomer as the matrix resin, combined with a polyolefin elastomer to construct a polymer network possessing both high toughness and low modulus, thereby endowing the adhesive film layer with excellent flexibility and wetting and spreading ability towards the adhered substrate. Maleic anhydride-grafted polyolefin, acting as a compatibilizer, utilizes the anhydride groups on its molecular chain to provide polar anchor points, improving the interfacial compatibility between the non-polar polyolefin matrix and the polar wood fibers.

[0008] This invention establishes a latent crosslinking reaction mechanism in the formulation system. At room temperature and during the film forming stage, the components maintain a physically mixed state or a low degree of grafting. During the high-temperature stage of hot pressing of the sheet, a series of chemical reactions are initiated through the synergistic effect of the peroxide initiator, crosslinking aid, and vinyltrimethoxysilane. The specific mechanism of action is as follows: Free radical initiation stage: Under hot-press and high-temperature excitation, the peroxide initiator undergoes thermal decomposition to generate primary free radicals. The primary free radicals take hydrogen atoms from the molecular chains of metallocene propylene elastomers and polyolefin elastomers to generate macromolecular chain free radicals.

[0009] Grafting and crosslinking stage: Macromolecular chain free radicals attack the double bonds of the crosslinking aid and the vinyl groups of vinyltrimethoxysilane. The crosslinking aid bridges different polymer molecular chains together through its multifunctional structure, forming a three-dimensional network structure, which improves the heat resistance and creep resistance of the adhesive layer; silane coupling agents are grafted onto the polymer backbone.

[0010] Interfacial chemical bonding stage: At the interface between the adhesive film and the reconstituted decorative veneer, the maleic anhydride groups grafted onto the molecular chain undergo esterification reaction with the hydroxyl groups on the surface of the wood fibers after ring opening; the silanol groups generated by the hydrolysis of the grafted silane coupling agent form strong silicon-oxygen bonds with the hydroxyl groups on the surface of the wood.

[0011] The dual strengthening mechanism of bulk cross-linking and interfacial bonding enables the technology board to achieve high strength while retaining the flexibility of the matrix resin, thus realizing the shapeability of the board. Preferably, the metallocene propylene-based elastomer is a random copolymer of propylene and ethylene with a melting point of 40°C to 100°C; the polyolefin elastomer is a copolymer of ethylene and octene or a copolymer of ethylene and butene. This selection of melting point range ensures good flow and wetting of the film at lower processing temperatures, avoiding problems such as carbonization or discoloration of the wood veneer due to excessively high processing temperatures.

[0012] Preferably, the peroxide initiator is tert-butyl peroxide-2-ethylhexanoate; the crosslinking aid is triallyl isocyanurate; and the vinyltrimethoxysilane is vinyltrimethoxysilane. This combination of aids has a matched half-life temperature, which ensures that no pre-crosslinking occurs during the extrusion granulation and casting stages, while the crosslinking reaction can be rapidly completed during the hot pressing stage.

[0013] Preferably, one layer of the two-layer reconstituted decorative veneer has a longitudinal grain direction, while the other layer has a longitudinal grain direction, and they are bonded together by cross-lamination of modified polyolefin adhesive film layers. This orthogonal laying structure, combined with the stress transfer effect of the intermediate flexible adhesive layer, effectively eliminates the anisotropic stress of the wood, making the board less prone to interlayer cracking or surface wrinkling when bent and shaped.

[0014] A second aspect of this invention provides a method for preparing a flexible, shapeable technological board, comprising the following steps: Step S1: Premix the peroxide initiator, crosslinking aid, and vinyltrimethoxysilane into a uniform active liquid phase coating agent. Mix the metallocene propylene elastomer, polyolefin elastomer, and maleic anhydride-grafted polyolefin particles, spray the above active liquid phase coating agent, stir until the particle surface is wetted, and then add polyethylene wax and calcium pimecroate to obtain surface-loaded reactive particles.

[0015] Step S2: The above-mentioned surface-loaded reactive particles are added to an extruder for extrusion casting, and then rapidly cooled and wound to obtain a modified polyolefin film.

[0016] Step S3: Select two reconstituted decorative veneers, adjust the moisture content, and stack them in the order of veneer, modified polyolefin film, and veneer.

[0017] Step S4: Send the assembled board into a hot press for hot pressing. After hot pressing, maintain pressure and cool to obtain a flexible and malleable technology board.

[0018] By adopting the above technical solution, in step S1, the initiator and crosslinking agent are uniformly adsorbed onto the surface of resin particles by premixing the active liquid phase and spraying it for coating. Compared with direct dry mixing, this avoids the phenomenon of local crosslinking crystal points or local uncured phenomena caused by uneven dispersion of trace additives, thus ensuring the consistency of the film's reactive activity.

[0019] In step S2, the low melting point of the metallocene propylene-based elastomer is utilized to achieve low-temperature extrusion molding of the film. The key to this step is controlling the thermal process during extrusion, ensuring that only the physical plasticization and molding of the resin are completed, while inhibiting the occurrence of chemical cross-linking reactions, thereby preparing a thermoplastic film with latent reactivity.

[0020] In step S4, the high temperature and high pressure environment of the hot press simultaneously completes the pressing and molding of the sheet material and the chemical cross-linking and curing of the adhesive film. The pressure holding and cooling process helps to fix the crystalline morphology of the polymer, eliminate thermal stress, and prevent the sheet material from springing back and deforming after the pressure is released.

[0021] Preferably, the specific operation in step S1 is as follows: metallocene propylene elastomer, polyolefin elastomer and maleic anhydride grafted polyolefin particles are put into a low-speed mixer to form a resin particle mixture; peroxide initiator, crosslinking aid and vinyltrimethoxysilane are premixed to prepare a uniform active liquid phase coating agent; the mixer is started and the active liquid phase coating agent is sprayed onto the surface of the resin particle mixture and stirred for 3 to 5 minutes until the particle surface is wet; polyethylene wax and calcium pimecrolate are added and stirred for another 2 to 5 minutes to allow the powdered additives to adhere to the wet particle surface.

[0022] Preferably, in step S2, the extruder temperature is set as follows: zone one temperature 90°C to 110°C, zone two temperature 100°C to 120°C, and zone three and die head temperature 105°C to 130°C. After the melt is extruded and cast through the die head, it is immediately subjected to rapid cooling and shaping on rollers at a temperature of 5°C to 10°C. Precise control of this temperature range is key to balancing plasticization quality and preventing early crosslinking. Rapid cooling and shaping reduces the crystallinity of the film, maintaining its soft feel and transparency.

[0023] Preferably, in step S4, the hot-pressing temperature is set to 135°C to 145°C, and the unit pressure is set to 10 kgf / cm². 2 Up to 12 kgf / cm 2 The hot-pressing time is set to 10 to 15 minutes; during the pressure holding and cooling step, the pressure is released when the center temperature of the board drops to 40°C to 50°C. These process parameters ensure that the peroxide initiator fully decomposes and initiates cross-linking, while allowing the glue melt sufficient time and pressure to penetrate into the micropores of the wood surface, forming a "glue nail" effect and further enhancing the physical anchoring force.

[0024] This invention provides a flexible, shapeable technological board and its preparation method. It has the following beneficial effects: 1. This invention constructs a latent crosslinking system by introducing peroxide initiators and crosslinking aids into a metallocene propylene-based elastomer and a polyolefin elastomer matrix. This system maintains thermoplasticity during the film extrusion stage, facilitating processing and molding; during the high-temperature stage of hot pressing of the sheet, a chemical crosslinking reaction occurs, forming a three-dimensional network structure. This improves the heat creep resistance of the adhesive layer, enabling it to withstand the high-temperature environment of subsequent finishing processes without slippage or delamination, while retaining the excellent flexibility of the matrix resin to meet the processing requirements of irregular curved surfaces.

[0025] 2. This invention achieves high-strength chemical bonding between non-polar polyolefin films and polar wood veneers through the synergistic effect of maleic anhydride-grafted polyolefins and vinyltrimethoxysilane. Maleic anhydride groups undergo esterification with the hydroxyl groups on the wood surface, while vinyltrimethoxysilane is grafted onto the polymer backbone and hydrolyzes to form silicon-oxygen bonds with the wood. This dual chemical bonding mechanism overcomes the shortcomings of traditional thermoplastic films that rely solely on physical anchoring, resulting in poor water resistance. It improves the bonding strength and boiling water resistance of the boards, ensuring that the boards do not crack during long-term use in humid environments.

[0026] 3. This invention employs an active liquid-phase coating process combined with low-temperature extrusion technology, effectively ensuring the consistency of the film's reactivity and appearance quality. By premixing initiators and other liquid-phase additives and uniformly coating them onto the surface of resin particles, the problem of uneven dispersion of trace additives is avoided. Combined with a strictly controlled low-temperature extrusion process, pre-crosslinking during film preparation is suppressed, eliminating crystal point defects in the adhesive layer. The addition of calcium pimecrolate, combined with the pressure holding and cooling process after hot pressing, regulates the polymer's crystal morphology, reduces internal stress, and further improves the dimensional stability and surface smoothness of the sheet. Attached Figure Description

[0027] Figure 1 This is a flowchart of the preparation method of the present invention; Figure 2 This is a schematic diagram comparing the bonding strength under normal conditions and in boiling water resistance of the present invention. Figure 3 This is a schematic diagram comparing the flexibility and shapeability limits of the sheet metal of the present invention. Detailed Implementation

[0028] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. 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.

[0029] The main raw materials and reagents used in the following examples and comparative examples have the following sources and specifications. Reagents not specifically mentioned are all commercially available analytical grade or higher grade products.

[0030] Metallocene propylene-based elastomer (m-PBE): a random copolymer of propylene and ethylene, with ethylene repeating units content of 16 wt% and a density of 0.862 g / cm³. 3 The melt mass flow rate (230℃, 2.16kg) is 9.1g / 10min, and the melting point is 40-100℃.

[0031] Polyolefin elastomer (POE): Ethylene-octene copolymer, octene repeating unit content 38wt%, density 0.870 g / cm³ 3 The melt mass flow rate (190℃, 2.16kg) is 1.0g / 10min, and the melting point is 60℃.

[0032] Maleic anhydride-grafted polyolefin: Maleic anhydride was grafted onto an ethylene-octene copolymer matrix with a grafting rate of 0.8 wt% and a density of 0.87 g / cm³. 3 The melt mass flow rate (190℃, 2.16kg) is 1.6g / 10min.

[0033] tert-butyl peroxide-2-ethylhexanoate (TBEC): purity ≥98%, 1-hour half-life temperature 117℃, CAS No. 34443-12-4.

[0034] Triallyl isocyanurate (TAIC): Purity ≥99%, CAS No. 1025-15-6.

[0035] Vinyltrimethoxysilane (VTMO): purity ≥99%, CAS No. 2768-02-7.

[0036] Calcium pimecronate (β-crystal nucleating agent): purity ≥98%, particle size D50≤5μm, CAS No. 19455-20-0.

[0037] Polyethylene wax: molecular weight 2000-3000, softening point 105℃, CAS number 9002-88-4.

[0038] Dicumyl peroxide (DCP): purity ≥99%, CAS number 80-43-3.

[0039] Modified urea-formaldehyde resin: Commercially available E0 grade, solid content 52%.

[0040] Water-based polyurethane adhesive: Commercially available single-component woodworking adhesive with a solids content of 45%.

[0041] Reconstituted decorative veneer: poplar wood base, 0.5mm thick, moisture content 8%-10%.

[0042] Preparation Example 1: This preparation example provides a method for preparing a modified polyolefin film, including the following steps: (1) Weigh 70 parts of metallocene propylene elastomer, 20 parts of polyolefin elastomer, and 10 parts of maleic anhydride grafted polyolefin particles, and put them into a low-speed mixer to form a resin particle mixture. (2) 0.15 parts of tert-butyl peroxide-2-ethylhexanoate, 0.6 parts of triallyl isocyanurate, and 0.3 parts of vinyltrimethoxysilane are premixed to form a uniform active liquid phase coating agent; (3) Start the mixer, spray the active liquid phase coating agent onto the surface of the resin particles, stir for 3 minutes until the particles are wet, then add 2 parts of polyethylene wax and 0.15 parts of calcium pimecronate powder, and continue stirring for 2 minutes to obtain surface-loaded reactive particles. (4) Add the granules to a single screw extruder, set the temperature of zone 1 to 110℃, zone 2 to 120℃, and zone 3 and die head to 130℃, extrude and cast, and cool rapidly on a roller at 5-10℃, and then roll up to obtain a film with a thickness of 0.1mm.

[0043] Preparation Example 2: This preparation example provides a method for preparing a modified polyolefin film, including the following steps: (1) Weigh 70 parts of metallocene propylene elastomer, 20 parts of polyolefin elastomer, and 10 parts of maleic anhydride-grafted polyolefin particles and put them into a low-speed mixer. (2) 0.25 parts of tert-butyl peroxide-2-ethylhexanoate, 1.0 part of triallyl isocyanurate, and 0.5 parts of vinyltrimethoxysilane are premixed to form a uniform active liquid phase coating agent; (3) Start the mixer, spray the active liquid phase coating agent onto the surface of the resin particles, stir for 5 minutes until the particles are wet, then add 3 parts of polyethylene wax and 0.3 parts of calcium pimecronate powder, and continue stirring for 5 minutes to obtain surface-loaded reactive particles. (4) Add the granules to a single screw extruder, set the temperature of zone 1 to 90℃, zone 2 to 100℃, and zone 3 and die head to 105℃, extrude and cast, and cool rapidly on a roller at 5-10℃, and then roll up to obtain a film with a thickness of 0.1mm.

[0044] Preparation Example 3: This preparation example provides a method for preparing a modified polyolefin film, including the following steps: (1) Weigh 55 parts of metallocene propylene elastomer, 30 parts of polyolefin elastomer, and 15 parts of maleic anhydride grafted polyolefin particles and put them into a low-speed mixer. (2) 0.15 parts of tert-butyl peroxide-2-ethylhexanoate, 0.6 parts of triallyl isocyanurate, and 0.3 parts of vinyltrimethoxysilane are premixed to form a uniform active liquid phase coating agent; (3) Start the mixer, spray the active liquid phase coating agent onto the surface of the resin particles, stir for 3 minutes until the particles are wet, then add 2 parts of polyethylene wax and 0.15 parts of calcium pimecronate powder, and continue stirring for 2 minutes to obtain surface-loaded reactive particles. (4) Add the granules to a single screw extruder, set the temperature of zone 1 to 90℃, zone 2 to 100℃, and zone 3 and die head to 105℃, extrude and cast, and cool rapidly on a roller at 5-10℃, and then roll up to obtain a film with a thickness of 0.1mm.

[0045] Preparation Example 4: This preparation example provides a method for preparing a modified polyolefin film, including the following steps: (1) Weigh 75 parts of metallocene propylene elastomer, 20 parts of polyolefin elastomer, and 5 parts of maleic anhydride grafted polyolefin particles and put them into a low-speed mixer. (2) 0.15 parts of tert-butyl peroxide-2-ethylhexanoate, 0.6 parts of triallyl isocyanurate, and 0.3 parts of vinyltrimethoxysilane are premixed to form a uniform active liquid phase coating agent; (3) Start the mixer, spray the active liquid phase coating agent onto the surface of the resin particles, stir for 3 minutes until the particles are wet, then add 2 parts of polyethylene wax and 0.15 parts of calcium pimecronate powder, and continue stirring for 2 minutes to obtain surface-loaded reactive particles. (4) Add the granules to a single screw extruder, set the temperature of zone 1 to 90℃, zone 2 to 100℃, and zone 3 and die head to 105℃, extrude and cast, and cool rapidly on a roller at 5-10℃, and then roll up to obtain a film with a thickness of 0.1mm.

[0046] Preparation Example 5: This preparation example provides a method for preparing a modified polyolefin film (without using a liquid phase coating process), including the following steps: (1) Weigh 70 parts of metallocene propylene elastomer, 20 parts of polyolefin elastomer, and 10 parts of maleic anhydride grafted polyolefin particles and put them into a mixer. (2) Directly add 0.15 parts of tert-butyl peroxide-2-ethylhexanoate, 0.6 parts of triallyl isocyanurate, 0.3 parts of vinyltrimethoxysilane, 2 parts of polyethylene wax and 0.15 parts of calcium pimecronate powder; (3) After mixing and stirring for 5 minutes for simple physical mixing, no obvious uniform wetting of the particle surface was observed, and some droplets were aggregated. (4) Add the mixture to a single screw extruder, set the temperature of zone 1 to 90°C, zone 2 to 100°C, and zone 3 and die head to 105°C, extrude and cast, and cool rapidly on a roller at 5-10°C, and then roll up to obtain a film with a thickness of 0.1 mm.

[0047] Preparation Example 6: This preparation example provides a method for preparing a modified polyolefin film, including the following steps: (1) Weigh 70 parts of metallocene propylene elastomer, 20 parts of polyolefin elastomer, and 10 parts of maleic anhydride-grafted polyolefin particles and put them into a low-speed mixer. (2) 0.15 parts of tert-butyl peroxide-2-ethylhexanoate, 0.6 parts of triallyl isocyanurate, and 0.3 parts of vinyltrimethoxysilane are premixed to form a uniform active liquid phase coating agent; (3) Start the mixer, spray the active liquid phase coating agent onto the surface of the resin particles, stir for 3 minutes until the particles are wet, then add 2 parts of polyethylene wax and 0.15 parts of calcium pimecronate powder, and continue stirring for 2 minutes to obtain surface-loaded reactive particles. (4) Add the granules to a single screw extruder and set the temperature of zone 1 to 110°C, zone 2 to 120°C, and zone 3 and die head to 130°C. During the extrusion process, it was observed that the pressure at the die head outlet fluctuated greatly and crystal points occasionally appeared on the film surface. The film was cast, cooled and wound up to obtain a film with a thickness of 0.1 mm.

[0048] Example 1: This embodiment provides a method for preparing a flexible, shapeable technological board, including the following steps: S1. Select two reconstituted decorative veneers with dimensions of 1.24m×2.44m×0.5mm, adjust the moisture content to 8%-10%, one with a longitudinal grain direction and the other with a transverse grain direction. S2. The film prepared by longitudinal veneer - preparation of film obtained in Example 1 - oriented veneer is stacked and assembled to ensure that the film is laid flat without wrinkles. S3. Feed the assembled sheet metal into the hot press, setting the hot pressing temperature to 140℃ and the unit pressure to 10 kgf / cm². 2 (Approximately 1.0 MPa), hot pressing time is 12 minutes; S4. After hot pressing is completed, keep the pressure constant and introduce cooling water to cool the board. When the center temperature of the board drops to 45℃, release the pressure and take out the board. S5. Perform a fixed-thickness sanding treatment on the surface of the board to make the surface roughness Ra≤0.8μm, thus obtaining a flexible and malleable technology board.

[0049] Example 2: This embodiment provides a method for preparing a flexible, shapeable technological board, including the following steps: S1. Select two reconstituted decorative veneers with dimensions of 1.24m×2.44m×0.5mm, adjust the moisture content to 8%-10%, one with the grain direction longitudinally and the other with the grain direction parallel. S2. The preform is assembled by laminating longitudinal veneers, preparing the adhesive film obtained in Example 2, and then forward veneers. S3. Feed the assembled sheet metal into the hot press, setting the hot pressing temperature to 140℃ and the unit pressure to 12 kgf / cm². 2 (Approximately 1.2 MPa), hot pressing time is 15 minutes; S4. After hot pressing is completed, keep the pressure constant and introduce cooling water to cool the board. When the center temperature of the board drops to 50°C, release the pressure and remove the board. S5. Perform a fixed-thickness sanding treatment on the surface of the board to make the surface roughness Ra≤0.8μm, thus obtaining a high heat-resistant flexible technology board.

[0050] Example 3: This embodiment provides a method for preparing a flexible, shapeable technological board, including the following steps: S1. Select two reconstituted decorative veneers with dimensions of 1.24m×2.44m×0.5mm, adjust the moisture content to 8%-10%, one with the grain direction longitudinally and the other with the grain direction parallel. S2. The preforms are stacked in the order of "longitudinal veneer - adhesive film prepared in Example 3 - forward veneer"; S3. Feed the assembled sheet metal into the hot press, setting the hot pressing temperature to 140℃ and the unit pressure to 10 kgf / cm². 2 (Approximately 1.0 MPa), hot pressing time is 10 minutes; S4. After hot pressing is completed, keep the pressure constant and introduce cooling water to cool the board. When the center temperature of the board drops to 40℃, release the pressure and take out the board. S5. Perform a fixed-thickness sanding treatment on the surface of the board to make the surface roughness Ra≤0.8μm, thus obtaining a highly flexible and tough flexible technology board.

[0051] Example 4: This embodiment provides a method for preparing a flexible, shapeable technological board, including the following steps: S1. Select two reconstituted decorative veneers with dimensions of 1.24m×2.44m×0.5mm, adjust the moisture content to 8%-10%, one with the grain direction longitudinally and the other with the grain direction parallel. S2. The preforms are stacked in the order of "longitudinal veneer - adhesive film prepared in Example 1 - forward veneer"; S3. Feed the assembled sheet metal into the hot press, set the hot pressing temperature to 135℃ and the unit pressure to 10 kgf / cm².2 (Approximately 1.0 MPa), hot pressing time is 15 minutes; S4. After hot pressing is completed, keep the pressure constant and introduce cooling water to cool the board. When the center temperature of the board drops to 45℃, release the pressure and take out the board. S5. Perform a fixed-thickness sanding treatment on the surface of the board to obtain the flexible technology board.

[0052] Example 5: This embodiment provides a method for preparing a flexible, shapeable technological board, including the following steps: S1. Select two reconstituted decorative veneers with dimensions of 1.24m×2.44m×0.5mm, adjust the moisture content to 8%-10%, one with the grain direction longitudinally and the other with the grain direction parallel. S2. The preforms are stacked in the order of "longitudinal veneer - adhesive film prepared in Example 1 - forward veneer"; S3. Feed the assembled sheet metal into the hot press, setting the hot pressing temperature to 145℃ and the unit pressure to 12 kgf / cm². 2 (Approximately 1.2 MPa), hot pressing time is 10 minutes; S4. After hot pressing is completed, keep the pressure constant and introduce cooling water to cool the board. When the center temperature of the board drops to 45℃, release the pressure and take out the board. S5. Perform a fixed-thickness sanding treatment on the surface of the board to obtain the flexible technology board.

[0053] Comparative Example 1: Compared to Example 1, the difference lies in that: instead of using a modified polyolefin film, a commercially available modified urea-formaldehyde adhesive is used as the binder; and a coating process is employed, with a coating amount of 140 g / m². 2 And at 120℃ and 10kgf / cm 2 The hot pressing is carried out for 8 minutes, and the specifications of the remaining single boards are the same as those of the pretreatment.

[0054] Comparative Example 2: Compared to Example 1, the difference lies in that: instead of using a modified polyolefin film, a commercially available water-based polyurethane adhesive is used as the bonding agent; and a coating process is employed, with a coating amount of 150 g / m². 2 It was then cold-pressed at room temperature for 4 hours, and all other steps were the same.

[0055] Comparative Example 3: Compared with Example 1, the difference is that the modified polyolefin film used did not contain tert-butyl peroxide-2-ethylhexanoate (TBEC) and triallyl isocyanurate (TAIC) during the preparation process, and relied solely on physical melt bonding. The remaining raw material ratios, preparation, and hot pressing processes were the same.

[0056] Comparative Example 4: The difference lies in the fact that, during the preparation of the modified polyolefin film, the low-temperature active TBEC is replaced in equal molar form with the high-temperature active dicumyl peroxide (DCP), while all other aspects remain the same.

[0057] Comparative Example 5: The difference from Example 1 is that the modified polyolefin film used was not prepared with vinyltrimethoxysilane (VTMO) and lacked a chemical dehydration mechanism; otherwise, they were the same.

[0058] Comparative Example 6: The difference is that the pressure holding and cooling step is eliminated in the hot pressing process. After hot pressing, the pressure is released and the mold is opened directly at a high temperature of 140℃, followed by natural cooling. Everything else is the same.

[0059] Comparative Example 7: Compared with Example 1, the difference is that the film prepared in Example 6 was used. The film was extruded at a temperature as high as 130°C during the preparation process, which caused pre-crosslinking and the presence of crystal points inside the film. The rest of the preform assembly and hot pressing process were the same.

[0060] Test Example 1: Test description: To verify whether the adhesive layer underwent a chemical cross-linking reaction during the hot pressing process at 140℃.

[0061] Test steps: Sample preparation: Take the original adhesive film after extrusion and cooling in Preparation Example 1 as sample A; take the boards prepared in Examples 1, 2, 4 and Comparative Example 3 and obtain the intermediate adhesive layer by physical peeling; take the adhesive film after extrusion and cooling in Comparative Example 7 (without hot pressing) as sample F; cut the above samples into fragments with a particle size of about 1 mm × 1 mm as subsequent test samples.

[0062] Weighing Sample Preparation: Cut 120-mesh stainless steel wire mesh into squares, fold them into a mesh bag shape, and weigh the mesh bag, recording the mass as follows. Accurately weigh approximately 500g of the sample to be tested and place it in a mesh bag. After sealing, weigh the total mass of the mesh bag and the sample, and record it as follows: .

[0063] Solvent extraction: Add xylene solvent to the flat-bottomed flask of the Soxhlet extractor, and add reagent-grade antioxidant 1010 (concentration approximately 0.5%) to prevent oxidative degradation during the extraction process. Place the mesh bag containing the sample in the reflux tube of the extractor, heat to boiling of xylene, control the reflux rate at 4-6 times per hour, and continue reflux extraction for 12 hours.

[0064] Drying and Weighing: After extraction, remove the mesh bag and place it in a fume hood to evaporate naturally for 2 hours to remove most of the solvent. Then, transfer it to a vacuum oven and vacuum dry at 100℃ and -0.1MPa for 6 hours until constant weight. Remove it and place it in a desiccator to cool to room temperature. Weigh the total mass of the mesh bag and residue after extraction and record it as follows: .

[0065] Data calculation: According to the formula Calculate the gel content by performing three parallel tests on each sample group and taking the arithmetic mean.

[0066] The test data is shown in Table 1: Table 1: Results of Crosslinking Degree (Gel Content) Test for Each Group of Samples

[0067] (Note: The fluctuations in the data for sample D are mainly due to testing errors and impurity quality, and are considered as non-crosslinked.) According to the appendix Figure 1 According to the data in Table 1, the average gel content of sample A (original film) is only 0.12%, which is close to zero. This indicates that under the low-temperature extrusion process of 90-105℃, the peroxide initiator TBEC in the formulation is in a latent state and no obvious decomposition reaction occurs. The polyolefin matrix maintains good thermoplasticity, which verifies the effectiveness of the low-temperature limited shear extrusion process in preventing machine failure.

[0068] Sample B (Example 1) showed a gel content jump to 59.85% after hot pressing at 140°C for 12 minutes, demonstrating that within the set hot pressing temperature window, TBEC rapidly decomposed and triggered a free radical reaction, successfully transforming the linear m-PBE / POE molecular chains into a three-dimensional network structure using the crosslinking agent TAIC. This value falls within the ideal range of 40%-75%, ensuring sufficient crosslinking density to resist high-temperature creep while retaining some non-crosslinked segments to maintain the material's flexibility.

[0069] Comparing samples B and D (39.21%), the gel content decreased when the hot-pressing temperature dropped to 135℃. This is consistent with the Arrhenius kinetics of peroxide decomposition, indicating that 135℃ is in the critical region where the TBEC half-life changes rapidly, leading to incomplete reaction and potential fluctuations in heat resistance. This confirms the necessity of the 140℃ process setting. Sample F (Comparative Example 7) showed a gel content of 10.93%, indicating that during the high-temperature extrusion process at 130℃, some initiator decomposed prematurely, resulting in pre-crosslinking. Although this level of pre-crosslinking is not high, it is sufficient to form microscopic gel particles (crystal points) during film casting, disrupting the uniformity of the film appearance and affecting the melt penetration ability during subsequent hot pressing.

[0070] The extremely low gel content of sample C (Comparative Example 3) confirms that polyolefins without initiator systems are difficult to form chemical networks under physical hot pressing, and physical entanglement alone is insufficient to meet the high-temperature resistance requirements.

[0071] Test Example 2: Test description: To investigate the effects of different formulations on bond strength and the water-removing anchoring effect of silane.

[0072] Test steps: Specimen Preparation: Test specimens were cut from the central area of ​​the boards prepared in Examples 1-5 and Comparative Examples 1-7. Following GB / T 17657-2013 "Test Methods for Physical and Chemical Properties of Wood-based Panels and Decorative Wood-based Panels", the boards were cut into strips 100 mm long and 25 mm wide. Tensile shear strength testing was conducted, with grooves machined at both ends of the specimens, and the effective bonding area was set to 25 mm × 25 mm. Twelve parallel specimens were prepared for each group, randomly divided into two groups, one for normal strength testing and the other for boiling water resistance testing.

[0073] Normal strength test (dry state): The first group of specimens was placed in a constant temperature and humidity environment of 23±2℃ and 50±5% for 48 hours to reach equilibrium moisture content. Using a universal testing machine (equipped with a 10kN sensor), the tensile speed was set to 10mm / min, and the specimens were subjected to axial tension until failure. The maximum breaking load was recorded. And according to the formula Calculate the normal bonding strength, where For the width of the specimen, This represents the glued length.

[0074] Boiling water resistance test (damp heat cycling): The second group of specimens was completely immersed in a boiling water bath and kept boiling for 4 hours. The specimens were then removed and placed in a 60±2℃ forced-air drying oven for 3 hours to remove surface moisture and stabilize the interface, and then transferred to a desiccator to cool to room temperature. Tensile shear tests were performed using the same parameters as above, the failure load was recorded, and the boiling water resistance bond strength was calculated.

[0075] Failure mode recording: While recording the values, observe whether the fracture occurs inside the adhesive layer (cohesive failure), the wood layer (wood breakage), or the interface between the adhesive layer and the wood (interface failure).

[0076] The test data is shown in Table 2: Table 2: Test results of bonding strength of each group of samples under normal conditions and boiling water resistance

[0077] (Note: Strength retention rate = boiling water resistance strength / normal bonding strength × 100%; in Comparative Example 3, the adhesive layer melted and was lost during boiling, so the strength was recorded as 0.) According to the appendix Figure 2 According to the data in Table 2, Examples 1-3 and 5 all exhibited excellent bonding performance under both normal and boiling water conditions. Example 1 had a normal strength of 2.14 MPa, and after 4 hours of boiling and drying cycles, the strength remained at 1.88 MPa (87.9% retention), with the failure mode primarily being wood matrix failure (high wood breakage rate). This confirms that the vinyltrimethoxysilane (VTMO) in the formulation efficiently completed the dehydration and coupling reactions during the 140°C hot-pressing stage. The silanol groups generated by silane hydrolysis formed a hydrolysis-resistant Si-OC covalent bond structure with the hydroxyl groups on the wood fiber surface, maintaining interfacial stability even under boiling water attack.

[0078] The test results of Comparative Example 5 (silane-free) showed a stark contrast. Although its normal strength reached 1.78 MPa (mainly due to physical anchoring), after boiling water treatment, the strength plummeted to 0.24 MPa, with a retention rate of only 13.5%, and the fracture surface exhibited smooth interfacial delamination. This data directly demonstrates the unreliability of physical interlocking under humid and hot conditions, and the decisive role of chemical bonding mechanisms in water resistance.

[0079] Comparative Example 3 (uncrosslinked) disintegrated in the boiling water test, with its strength dropping to zero. This is because the uncrosslinked polyolefin matrix has a low melting point (m-PBE approximately 100°C), causing it to soften or even melt and flow in boiling water at 100°C, thus losing its cohesive strength. In contrast, the Example group, due to the crosslinking network constructed by TAIC and TBEC, restricted the thermal movement of the molecular chains, allowing it to maintain solid strength even at temperatures above the matrix's melting point.

[0080] The normal strength of Comparative Example 7 (high-temperature extrusion pre-crosslinking) was only 0.89 MPa, far lower than that of Example 1. This indicates that pre-crosslinking during the extrusion process increases the melt viscosity and reduces the flow and penetration capacity of the adhesive layer during hot pressing, making it difficult for the adhesive to fully wet the wood vessels to form effective "adhesive nails" for anchoring. This verifies the necessity of controlling the extrusion temperature within the initiator latency period.

[0081] Although Comparative Example 1 (urea-formaldehyde resin) has the highest normal strength (2.65 MPa, due to its high rigidity), its boiling water resistance is extremely poor (retention rate 16.2%). This is because the urethane bonds and ether bonds in urea-formaldehyde resin are easily hydrolyzed and broken under high temperature and high humidity.

[0082] Test Example 3: Test Description: This test aims to evaluate the bending performance of the prepared technical board under different radii of curvature, and to test the crack resistance of the adhesive layer under complex stress conditions and its toughness transfer effect on the wood veneer.

[0083] Test steps: Specimen Preparation: From the boards prepared in Examples 1-3, Example 5, and Comparative Examples 1 (urea-formaldehyde resin) and 6 (without pressure holding and cooling), strip specimens measuring 200mm × 50mm were cut along the direction perpendicular to the grain of the veneer. The direction perpendicular to the grain was chosen to maximize the tensile stress applied to the adhesive layer and wood fibers, simulating the most demanding shaping conditions. Five parallel specimens were prepared for each group.

[0084] Environmental conditioning: All specimens were placed in an environment with a temperature of 23±2℃ and a relative humidity of 50±5% for 24 hours to eliminate the influence of temperature and humidity differences on the material modulus.

[0085] Winding Test: Prepare standard steel cylindrical molds with diameters of 100mm, 50mm, 30mm, and 15mm. Wind the specimen 180° tightly against the mold surface and hold it stationary for 5 seconds at the bending endpoint. The test sequence proceeds from the largest diameter to the smallest diameter. If the specimen fails at a certain diameter, stop testing for subsequent smaller diameters.

[0086] Destruction judgment: Observe the bent part of the specimen under strong light, and the judgment criteria are as follows: Pass: No cracks on the specimen surface, no delamination or cracking of the adhesive layer on the sides, and the structure remains intact after rebound. Microcracks: Tiny cracks appear on the wood surface, but the adhesive layer does not break, and the board does not break. Failure: The wood breaks completely, or the adhesive layer undergoes brittle fracture or delamination. Limiting Diameter Record: Record the smallest cylindrical diameter that each group of specimens can pass (including "pass" and "microcrack" states, based on the condition that the board as a whole does not undergo structural separation).

[0087] The test data is shown in Table 3: Table 3: Test Records of Cylindrical Winding Flexibility of Each Group of Sheets

[0088] (Note: "-" indicates that the preceding test was broken and this test was not performed.) According to the data in Table 3, Example 3 (high flexibility formulation), due to the increased proportion of polyolefin elastomer (POE), did not exhibit any cracks even at a limiting radius of 15 mm. This indicates that the high content of octene comonomer effectively reduced the crystallinity and modulus of the system, giving the board conformability. Example 1 also passed the 15 mm test, with only some samples showing micro-cracks, proving that the standard m-PBE / POE formulation ensures sufficient deformation capacity while maintaining strength. Comparative Example 1 (urea-formaldehyde resin) experienced brittle fracture in a 100 mm diameter test, with the minimum passing diameter exceeding 100 mm. This is determined by the highly cross-linked thermosetting rigid network of urea-formaldehyde resin, which has an extremely low elongation at break, making it difficult to withstand the tensile stress generated on the wood surface during bending, resulting in "glue breaking and wood fracture".

[0089] Comparative Example 6 (without pressure holding and cooling) had the same formulation as Example 1, but its minimum through diameter was only 50mm-100mm, and the fracture surface showed a whitening phenomenon. This confirmed the effect of the "restricted crystallization" process: during the process of direct depressurization and natural cooling at high temperature, the polypropylene matrix easily forms large-sized spherulites (α-crystals). This crystal structure is dense and has a clear interface, which are defect points of stress concentration, leading to the material becoming brittle. In contrast, Example 1, through pressure holding and cooling and the addition of a β-nucleating agent, induced the formation of bundle-like β-crystals. This crystal structure is relatively loose and can dissipate energy through crystal slippage and micro-silvering under stress. Example 2 (highly cross-linked) failed at 15mm, indicating that although the excessively high cross-linking density improved the heat resistance, it also restricted the movement of molecular chain segments, sacrificing some flexibility. This shows that there is a balance window for the amount of cross-linking agent, and a trade-off between heat resistance and flexibility needs to be made according to the specific application scenario.

[0090] Test Example 4: Test Description: This test aims to evaluate the high-temperature creep resistance of plywood when subjected to downstream finishing processes (such as impregnated paper lamination, paint curing, etc.) and to verify whether the adhesive layer has transformed from a thermoplastic state into a thermosetting network structure with heat resistance and dimensional stability.

[0091] Test steps: Specimen Preparation: Specimens were cut from the boards prepared in Examples 1, 2, and 4, as well as Comparative Example 2 (water-based PU adhesive), Comparative Example 3 (non-crosslinked adhesive film), and Comparative Example 4 (DCP initiator). The specimen size was 100mm × 25mm, with two veneers overlapped by an intermediate adhesive layer. The effective overlap area was strictly controlled to be 25mm × 25mm (i.e., 625mm). 2 This ensures that the stress-bearing area of ​​each group is consistent.

[0092] Marking and pretreatment: Draw a baseline (mark) across the upper and lower layers of veneer on the side of the overlapping area of ​​the specimen for subsequent measurement of the sliding distance. Place the specimen in a 23℃ environment for 1 hour to allow it to acclimate.

[0093] Applying the load: A 500g standard weight (generating approximately 0.08MPa shear stress) is suspended from the lower end of the specimen, which is then fixed to a stainless steel hanger at the upper end. This load setting is intended to simulate the shrinkage stress or self-weight stress exerted by the finishing material on the substrate during the finishing process.

[0094] High-temperature suspension: Quickly move the loaded rack into a precision forced-air drying oven preheated to 180±2℃ and start timing. This temperature is higher than the melting point of the polypropylene matrix (approximately 160-165℃) and is in the complete melting range.

[0095] Observation Record: Maintain at 180℃ for 30 minutes. If the specimen detaches within 30 minutes, record the failure time; if it does not detach after 30 minutes, remove the specimen, cool it to room temperature, and use vernier calipers to measure the misalignment distance (creep distance) of the baseline, accurate to 0.01 mm.

[0096] The test data is shown in Table 4: Table 4: Creep Resistance Test Record under Constant Temperature Load at 180℃

[0097] (Note: "-" indicates that it is not applicable, i.e. the sample has completely detached; creep distance only applies to samples that pass the 30-minute test.) According to the data in Table 4, Examples 1 and 2 maintained the integrity of their connections under harsh conditions of 180°C and a 500g load, without any detachment. The average creep distance of Example 1 was approximately 1.0 mm, while that of Example 2 was only about 0.28 mm. This confirms that the chemical crosslinking network constructed by the initiator TBEC and the co-crosslinking agent TAIC was fully formed during the preparation process at 140°C. Even though the ambient temperature exceeded the crystal melting point of the matrix resins m-PBE and POE, although the physical crystals had melted, the chemical covalent bond network restricted the macroscopic flow of the molecular chains, exhibiting highly elastic rather than viscous flow characteristics, thus endowing the material with excellent high-temperature resistance and creep resistance. The smaller creep distance of Example 2 further confirms that the high TAIC content increased the crosslinking density, making the network structure more compact and rigid. Comparative Example 3 failed within about 2 minutes after being placed in the oven, which is typical rheological behavior of thermoplastic polymers. At 180℃, the uncrosslinked polyolefin molecular chains completely untangled, and the viscosity dropped sharply, making it unable to withstand any external force, proving that simple physical modification cannot meet the requirements of high-temperature finishing processes.

[0098] The data from Comparative Example 4 showed instability, failing within the 18-28 minute range or exhibiting significant slippage. This kinetically validates the criticality of initiator selection: DCP's 1-hour half-life temperature is 137℃, and its decomposition rate is slow under the 140℃ hot-pressing process, leading to incomplete cross-linking and leaving a large number of unreacted linear molecular chains. In the subsequent 180℃ test, although DCP began to decompose rapidly, the specimen was already under load, and the viscous flow of the uncross-linked portion caused interface damage. Comparative Example 2 failed in about 10 minutes, indicating that conventional single-component wood adhesives undergo phase separation or softening of their hard and soft segments above 100℃, making them unable to withstand the high-temperature environment of finishing processes.

[0099] Test Example 5: Test Description: This test aims to comprehensively evaluate the environmental odor characteristics and surface micro-defects of the finished technology board, verify the influence of the initiator system selection on residual odor, and the actual effect of extrusion process and dehydration formula on eliminating surface crystal points and bubbling.

[0100] Test steps: Sample preparation: 300mm × 300mm square samples were cut from the sheets prepared in Example 1, Comparative Example 4 (DCP initiator), Comparative Example 5 (silane-free), Comparative Example 6 (without pressure holding and cooling), and Comparative Example 7 (high-temperature extrusion). Three parallel samples were selected from each group.

[0101] Odor rating: Using the heated bag method, the sample was quickly placed into an odorless polytetrafluoroethylene (Tealr) sampling bag, filled with 3L of high-purity nitrogen, and sealed. The sampling bag was then placed in a constant temperature chamber at 60±1℃ for 2 hours to simulate the release of volatiles under high temperature conditions. After removal, five trained professional odor assessors evaluated the odor through olfactory orifices. Rating criteria: Level 1 (no odor or only wood odor) to Level 5 (strong, pungent, or unbearable chemical odor).

[0102] Surface bubbling observation: In a dark room, illuminate the sample surface with a panel of LED lights with an illuminance of 1000 Lux at an incident angle of 45° (side lighting method). Observe and record the number of circular protrusions (bubbles) with a diameter greater than 0.5 mm on the sample surface, and convert them into the number per square meter.

[0103] Crystal point (gel point) count: Use a high-brightness flashlight held close to the back of the board for transmission inspection (for 0.5mm veneer with some light transmittance), or use a magnifying glass with side lighting to observe the surface. Count the transparent, hard, and insoluble tiny particles (0.2mm-2mm in diameter) present inside or on the surface of the adhesive layer; these are crystal points. Record the number per square meter.

[0104] Surface smoothness (orange peel effect): Visually assess whether there are microscopic unevennesses on the surface of the board that resemble orange peel, and record them as "smooth", "slight orange peel" or "severe orange peel".

[0105] The experimental data are shown in Table 5: Table 5: Sensory Odor and Surface Appearance Quality Inspection Records of Technology Boards

[0106] According to the data in Table 5, Example 1 exhibited the best overall quality across all test dimensions, with an odor rating of only 1.2-1.4 (close to the smell of natural wood), and a surface free of bubbles, crystal points, and exhibiting high smoothness. This verifies the effectiveness of the "TBEC initiator + VTMO dehydration + low-temperature extrusion + pressure holding and cooling" full-process control technology used in this test example. Comparative Example 4 had a severe irritating odor problem. This is because dicumyl peroxide (DCP) produces byproducts such as acetophenone and 2-phenyl-2-propanol during decomposition. Acetophenone has a persistent and unpleasant odor and is difficult to completely volatilize during hot pressing. In contrast, the TBEC decomposition products used in Example 1 are mainly acetone and tert-butanol, which are highly volatile and have no obvious odor, meeting the environmental protection requirements for interior decoration materials.

[0107] Comparative Example 5 had a surface bubble count as high as 35-42 per m. 2 This directly confirms the importance of in-situ chemical dehydration mechanisms. Under hot pressing at 140°C, the adsorbed water remaining inside the veneer rapidly vaporizes. Due to the lack of hydrolysis consumption by vinyl silane (VTMO), water vapor accumulates at the interface between the adhesive layer and the veneer, forming high-pressure gas pockets, which manifest as visible bubbles upon cooling. In Example 1, the water is converted into small alcohol molecules through silane hydrolysis and forms chemical bonds, eliminating the risk of bubbles at the source.

[0108] Comparative Example 7 showed a large number of crystal spots (28-33 per m). 2 These crystal points are due to the extrusion temperature (130°C) exceeding the initial decomposition temperature of the initiator TBEC, causing some polymers to undergo early crosslinking (scorch) within the screw. These pre-crosslinked gel particles have extremely high melting points and cannot melt and flow during subsequent hot pressing, forming appearance defects and potentially becoming stress concentration fracture sources. This conversely demonstrates the necessity of strictly controlling the extrusion temperature below 105°C (initiator latency) in this invention.

[0109] Comparative Example 6 (without pressure holding and cooling) showed fewer bubbles and crystal points, but exhibited severe "orange peel" texture and warping. This is because the polypropylene matrix was directly depressurized at high temperature, resulting in a large melt volume shrinkage rate and uncontrolled crystallization, forming large spherulite structures and increasing surface roughness. Example 1 used pressure holding and cooling combined with a β-nucleating agent, which resulted in finer crystals with uniform orientation, ensuring a smooth and clean surface on the sheet.

Claims

1. A flexible, shapeable technological board, characterized in that, It comprises two layers of reconstituted decorative veneer and a modified polyolefin film layer located between the two layers of reconstituted decorative veneer, the modified polyolefin film layer being made from raw materials comprising the following parts by weight: Metallocene propylene-based elastomer: 55-75 parts; Polyolefin elastomer: 20-30 parts; Maleic anhydride-grafted polyolefin: 5-15 parts; Peroxide initiator: 0.15-0.25 parts; Crosslinking aid: 0.6-1.0 parts; Vinyltrimethoxysilane: 0.3-0.5 parts; Polyethylene wax: 2-3 parts; Calcium pimecronate: 0.15-0.3 parts.

2. The flexible, shapeable technological board according to claim 1, characterized in that, The metallocene propylene-based elastomer is a propylene-ethylene random copolymer with a melting point of 40-100℃; the polyolefin elastomer is an ethylene-octene copolymer or an ethylene-butene copolymer.

3. The flexible, malleable technology board according to claim 1, characterized in that, The peroxide initiator is tert-butyl peroxide-2-ethylhexanoate; the crosslinking aid is triallyl isocyanurate; and the vinyltrimethoxysilane is vinyltrimethoxysilane.

4. The flexible, shapeable technological board according to claim 1, characterized in that, One of the two layers of reconstituted decorative veneer has a longitudinal texture, while the other has a longitudinal texture. The two layers of reconstituted decorative veneer are bonded together by interlacing the modified polyolefin film layers.

5. A method for preparing a flexible, malleable technological board, used to prepare the flexible, malleable technological board according to any one of claims 1-4, characterized in that, Includes the following steps: S1. A peroxide initiator, crosslinking aid, and vinyltrimethoxysilane are premixed into a uniform active liquid phase coating agent. Metallocene propylene elastomer, polyolefin elastomer, and maleic anhydride-grafted polyolefin particles are mixed and sprayed with the active liquid phase coating agent. The mixture is stirred until the particle surface is wetted, and then polyethylene wax and calcium pimecronate are added to obtain surface-loaded reactive particles. S2. The surface-loaded reactive particles are added to an extruder for extrusion casting, and then rapidly cooled and wound to obtain a modified polyolefin film. S3. Select two reconstituted decorative veneers, adjust the moisture content, and stack them in the order of veneer-modified polyolefin film-veneer. S4. The assembled board is sent to a hot press for hot pressing. After hot pressing, the board is held under pressure and cooled to obtain a flexible and malleable technology board.

6. The method for preparing a flexible, malleable technological board according to claim 5, characterized in that, Step S1 further includes: Metallocene propylene-based elastomer, polyolefin elastomer, and maleic anhydride-grafted polyolefin particles are fed into a low-speed mixer to form a resin particle mixture. A uniform active liquid-phase coating agent is prepared by premixing a peroxide initiator, a crosslinking aid, and a vinyltrimethoxysilane. Start the mixer and spray the active liquid phase coating agent onto the surface of the resin particles, and stir for 3-5 minutes until the particle surface is wet; Add polyethylene wax and calcium pimecronate, and continue stirring for 2-5 minutes to allow the powder additives to adhere to the moist particle surface, thus obtaining surface-loaded reactive particles.

7. The method for preparing a flexible, malleable technological board according to claim 5, characterized in that, Step S2 further includes: The surface-loaded reactive particles are added to a single-screw extruder for plasticizing and extrusion. The extruder temperature is set as follows: Zone 1 temperature 90-110℃, Zone 2 temperature 100-120℃, Zone 3 and die temperature 105-130℃. After the melt is extruded and cast through the die, it is immediately cooled and shaped on a roller at a temperature of 5-10℃, and then wound up to obtain an uncrosslinked modified polyolefin film with a thickness of 0.1mm.

8. The method for preparing a flexible, malleable technological board according to claim 5, characterized in that, In step S3, the pretreatment and assembly steps of the reconstituted decorative veneer include: Select two pieces of reconstituted decorative veneer and adjust their moisture content to 8%-10%; One of the two reconstituted decorative panels has a vertical grain direction, while the other panel has a horizontal grain direction. The preforms are stacked in the following order: longitudinal veneer - modified polyolefin film - oriented veneer, ensuring that the film is laid flat without wrinkles.

9. The method for preparing a flexible, malleable technological board according to claim 5, characterized in that, Step S4 further includes: The two reconstituted decorative veneers that have been stacked and assembled are fed into a hot press, and the hot pressing temperature is set to 135-145℃ to initiate the cross-linking reaction in the adhesive film layer and the interfacial chemical bonding. The unit pressure is set at 10-12 kgf / cm. 2 ; Set the hot pressing time to 10-15 minutes.

10. The method for preparing a flexible, malleable technological board according to claim 9, characterized in that, In step S4, the pressure holding and cooling process includes: After hot pressing, while keeping the unit pressure constant, cooling water is introduced to cool the two reconstituted decorative panels. When the center temperature of the two reconstituted decorative veneers drops to 40-50℃, the pressure is released and the two reconstituted decorative veneers are removed. The surfaces of the two reconstituted decorative veneers are subjected to a fixed-thickness sanding process to obtain a flexible, shapeable technology board.

Images