WO2016112554A1

WO2016112554A1 - Wood-plastic composite decorative panel and manufacturing method thereof

Info

Publication number: WO2016112554A1
Application number: PCT/CN2015/070955
Authority: WO
Inventors: 王清文; 易欣; 王小玉; 黄浪; 宗广功; 陈园; 谢延军; 于伸
Original assignee: 王清文; 易欣
Priority date: 2015-01-17
Filing date: 2015-01-17
Publication date: 2016-07-21
Also published as: CN107428133A

Abstract

A wood-plastic composite (WPC) decorative panel and manufacturing method thereof, the WPC decorative panel comprising: a shell layer composed of a thermoplastic WPC material and a core layer composed of a panel-shaped wood core. The core layer composed of the panel-shaped wood core is covered by the thermoplastic WPC shell layer, and a decorative layer printed by a thermal transfer technique is disposed on outside of the shell layer. The manufacturing method of the WPC decorative panel comprises: a, preparing the wood core; b, preparing thermoplastic WPC source materials, melting the WPC source materials by a co-extrusion device capable of receiving the wood core, and coextruding the melted source materials and the wood core to form a panel material comprising the wood core as an inside of the panel material and the thermoplastic WPC material as an outside of the panel material; c, performing a decorative processing on the extruded panel material; d, cooling and shaping the decorative processed panel material; e, cutting the cooled and shaped panel material; and f, sealing an end surface of the panel material. The WPC decorative panel manufactured by the method is resistant to creep, and has a good overall mechanical property and structural stability.

Description

Wood plastic composite decorative board and manufacturing method thereof

Technical field

The invention relates to a decorative board and a manufacturing method thereof, in particular to a wood plastic composite decorative board and a manufacturing method thereof.

Background technique

In the prior art, a method for manufacturing a wood-plastic composite (WPC) decorative sheet based on extrusion, molding or bonding, and the manufactured sheet has a tendency to creep and warp, resulting in furniture and interior decoration using the decorative panel. Defects in component deformation, poor decorative effect, and high density are too heavy to handle. Most of the solid wood decorative panels in the prior art are subject to the specifications of the materials. The wood-based wood-based panels need to be bonded with a large amount of adhesive on the substrate during the manufacturing process. The adhesive layer is easily exposed to the air. On the one hand, the exposed adhesive layer will continue to pollute the environment with the decomposition and volatilization of the adhesive. On the other hand, when the water molecules in the air enter the adhesive layer or the wood, it is easy to make The furniture panel is cracked, warped, deformed, reduced in strength, and mildewed and decayed. It is a problem in the prior art to create a decorative panel that solves the above problems in a new way.

technical problem

The invention solves the problem that the wood plastic composite decorative board is easy to creep, easy to warp and easily deform, and affects the decorative effect, and further proposes a wood plastic composite decorative board and a manufacturing method thereof.

Problem solution

Technical solution

The technical proposal adopted by the invention is: using a thermoplastic wood-plastic composite material after being melted and co-extruding with a wood core, and manufacturing a decorative board by a decorative process, the method comprising the steps of preparing a wood core; preparing a thermoplastic wood-plastic composite material mother And melting the wood-plastic composite masterbatch by a co-extrusion device that can feed the wood core, and co-extruding the sheet with the wood core; and performing the b-step extrusion of the sheet a step c of the decorative processing; a step d of cooling the shaped sheet; a step e of cutting the sheet; and a step f of closing the end surface of the sheet in the e step.

Advantageous effects of the invention

Beneficial effect

By feeding the wood core in the co-extrusion device and coextruding the wood-plastic composite masterbatch with the wood core, the wood core replaces a part of the wood plastic to reduce the overall density of the decorative board, due to the wood core to the wood-plastic The shortcomings of the wood plastics that are easily creepable are greatly weakened, so that the wood-plastic composite decorative board can be used normally under the condition of a certain temperature difference without being affected by the creep of wood plastic; by co-extrusion and after cutting The end face of the plate block is closed, which can solve the problem that the water molecules in the air enter the glue layer or the wood cells, so that the decorative plate has water resistance, avoiding the problems of cracking, warping, deformation, strength drop and mildew decay of the decorative plate. Normally, in order to facilitate the operation, the production of ordinary wood-plastic composite materials is cooled immediately after extrusion of the sheet material, and then subjected to decorative processing after being cooled, and the present invention is carried out on the sheet material extruded in step b. The decorative processing and cooling of the sheet after the step c of the decorative processing is completed, so that the wood-plastic composite has a longer time for the slow knot after the co-extrusion operation. Promote the uniformity and regularity of the crystalline polymer matrix, to reduce the internal stress and may decrease decorative wood-plastic composite plate is deformed and bent, help to improve the mechanical properties and dimensional stability of wood-plastic composite trim panel.

Brief description of the drawing

DRAWINGS

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a flow chart showing the manufacturing method of the present invention.

BEST MODE FOR CARRYING OUT THE INVENTION

A method for manufacturing a wood-plastic composite decorative panel according to the embodiment, comprising the step a of preparing a wood core; preparing a thermoplastic wood-plastic composite master batch and passing the wood-plastic by a co-extrusion device that can feed the wood core a step b of co-extruding the composite masterbatch with the wood core; a step c of decorating the plate extruded in step b; and a step d of cooling and decorating the decorated plate a step e of cutting off the sheet; and a step f of closing the end surface of the sheet of the step e.

Invention embodiment

Embodiments of the invention

DETAILED DESCRIPTION OF THE INVENTION A method for manufacturing a wood-plastic composite decorative panel according to the present embodiment includes a step a of preparing a wood core, preparing a thermoplastic wood-plastic composite master batch, and co-extruding through the wood core that can be fed a step b of melt-extruding the wood-plastic composite masterbatch and coextruding the sheet with the wood core; a step c of decorating the sheet extruded by the step b; and a decorative processed sheet a step d of cooling setting; a step e of cutting off the sheet; and a step f of closing the end surface of the sheet in the step e.

The technical effect of the embodiment is that the overall density of the decorative panel is reduced by feeding the wood core in the co-extrusion device and coextruding the wood-plastic composite masterbatch with the wood core, so that the wood core replaces a part of the wood plastic. Due to the pinning of the wood core to the wood plastic, the shortcomings of the wood plastic original creep are greatly weakened, so that the wood plastic composite decorative board can be normally used under the condition of a certain temperature difference without being affected by the wood plastic creep; Co-extrusion and sealing of the cut end face of the sheet can solve the problem of water molecules entering the glue layer or wood cells in the air, so that the decorative board has water resistance and avoids cracking, warping, deformation and strength of the decorative board. The problem of falling and mildew decay; normal situation In order to facilitate the operation, the production of ordinary wood-plastic composite materials is cooled immediately after the sheet is extruded, and then subjected to decorative processing after being cooled, and the present invention is directed to step b. The extruded sheet is subjected to decorative processing and the sheet is cooled and shaped after the step c of the decorative processing is completed, so that the wood-plastic composite is after the co-extrusion operation Slower crystallization for a longer period of time, promote the crystal uniformity and regularity of the polymer matrix, reduce the internal stress and reduce the possibility of deformation and bending of the wood-plastic composite decorative panel, and improve the comprehensive mechanical properties of the wood-plastic composite decorative panel. And dimensional stability.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT 2: The difference between this embodiment and the specific embodiment 1 is that the wood core processing method in the step a is: firstly, a solid wood rotary cutting veneer is selected, and a vinyl acetate emulsion and an acrylic resin are applied on the surface of the veneer. , an acrylic-polyurethane resin, an isocyanate, a melamine-urea aldehyde, a urea-formaldehyde glue or a phenolic aldehyde glue, and then cross-stacked the composite panels in a warp and weft direction according to the veneer texture, and then applying pressure to the blank sheet and standing to obtain a laminate. The laminate is further subjected to a drying treatment, and the dried laminate is cut to obtain the wood core.

The technical effect of the embodiment is that the wood core is manufactured by using the method for manufacturing a laminate, which is advantageous for overcoming the heterogeneity of the mechanical properties of the wood in all directions, and the obtained wood core is not easily deformed or warped. The mechanical properties of the finished decorative panel are more stable, and the decorative panel is not easily warped or deformed.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT 3: The difference between this embodiment and the specific embodiment 2 is that the wood core processing method in the step a further comprises: processing the both ends of the dried laminated wood core by a milling cutter to obtain a mutual fit Finger jointing hoe, and then treating the mutually matching finger joints with melamine-urea aldehyde, urea-formaldehyde glue or phenolic glue, and then applying opposing pressure on both ends of the laminate wood core to splicing the laminate wood core end-to-end, Get the wood core.

The technical effect of the embodiment is that the wooden core can be made shorter by manufacturing the finger joints which are matched with each other and treating the mutually matching finger joints with polyvinyl acetate emulsion, melamine-urea, urea-formaldehyde or phenolic glue. The material is obtained by long-splicing and splicing, which can realize long-term use of short materials and large-scale use of materials; since the method of co-extrusion of wood core and wood-plastic composite material is adopted, the wood core is enclosed in the wood-plastic composite material, so the external The moisture does not enter the interior of the wood-plastic composite decorative board, so that the water-based adhesive and the emulsion adhesive which are not suitable for the manufacture of the decorative board can be used for the wood-plastic composite decorative board, and the method can help reduce the wood-plastic composite decoration. The manufacturing cost of the board; at the same time, the volatile emissions that may be generated by the adhesive of the wood core adhered to the interior of the decorative board are not released into the environment, and the thermosetting resin adhesives which are not suitable for the manufacture of the decorative board are all unsuitable. Can be used to make wood-plastic composite decorative panels.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT 4: The difference between this embodiment and any one of Embodiments 1 to 3 is that the step of coextruding the sheet in step b requires simultaneous feeding of a plurality of narrow strips of wood core by a co-extrusion apparatus. The narrow strips of wood that are fed flat are not in direct contact and separated by a certain distance, and the molten wood-plastic composite masterbatch is coextruded with a plurality of said narrow strips of wood core.

The technical effect of the embodiment is that by feeding a plurality of the wood cores in parallel at the same time, each wood core is not directly contacted and separated by a certain distance, so that it is convenient to be in the wood core and wood according to the width after the decorative sheet is manufactured. The wood-plastic composite part between the cores is cut without exposing the wood core of the processed wood-plastic composite decorative board to the air, thereby avoiding cracking, warping, deformation, strength reduction of the wood-plastic composite decorative board, and The problem of mildew decay and other problems can improve the application field of wood-plastic composite decorative panels and simplify the production process of wood-plastic composite decorative panels; since wood is an anisotropic material, parallel feeding of multiple wood cores can balance wood The anisotropy may bring stress to the sheet, which makes the sheet obtained by processing more flat and less deformable.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT 5: The present embodiment differs from Embodiment 4 in that the co-extrusion apparatus described in the step b includes a wood-plastic extruder, a co-extrusion mold, and a wood core conveying device, and the co-extrusion mold has a mold body and a plurality of a root wood co-feed end, a wood-plastic whole plate discharge end, and the co-extrusion die is mounted on the head of the wood-plastic extruder in step b, so that the plurality of wood cores are fed together The wood plastic whole board discharge end is at Arranging in the same plane and in the same direction, the plurality of wood core co-feeding ends and the wood-plastic whole plate discharge ends are respectively located on two sides of the co-extrusion die, thereby further melting the thermoplastic wood-plastic composite The material masterbatch coats the wood core in a co-extrusion mold to obtain a coextruded sheet material wrapped with a thermoplastic wood-plastic composite material and having a plurality of wood cores.

The technical effect of the embodiment is that the wood-plastic extruder, the co-extrusion die and the wood core conveying device are arranged to ensure that the plurality of wood cores are controlled by the wood core transmission at the same time, and maintain a stable rate to ensure the plate material. Quality; by setting multiple wood core co-feed ends and wood-plastic whole plate discharge ends in the same direction on the same plane, it is possible to ensure that the co-extruded sheets are flat.

Embodiment 6: The difference between this embodiment and Embodiment 5 is that the co-extrusion die used in step b further includes a wood core guiding edge, a co-extrusion flow channel, a split flow channel on the mold body, and the wood core a plurality of the wood core guiding ribs are disposed on the inner wall of the feeding end, and the coextrusion flow passage is distributed by a plurality of places circumferentially distributed along the inner wall of the feeding end of the wood core and communicating with the inner wall of the feeding end of the wood core a split flow channel communicating component, the split flow channel is a tapered flow channel, and a corner of the plurality of split flow channels has a corner, and the split flow channel is connected to the wood core feed end on the mold body The profile discharge end on the mold body is wrapped around the coextrusion flow passage.

The technical effect of the embodiment is that the wood core guiding rib is provided to help the wood core enter the mold body in a predetermined direction, so that the relative position of the wood core and the coextrusion flow passage does not change during the feeding process, and The wood-plastic composite material that ensures that the wood core is melted inside the co-extrusion mold maintains a stable feed under pressure, and finally ensures that the position of the wood core relative to the outer surface of the wood-plastic composite floor is fixed.

BEST MODE FOR CARRYING OUT THE INVENTION 7: The difference between this embodiment and any one of Embodiments 1 to 6 is that the decorative processing described in the step c is after the molten co-extrusion of the sheet material, and the high temperature of the surface of the sheet after melt extrusion is passed. The thermal transfer device adheres the thermal transfer decorative layer to the outer surface of the plate to realize thermal transfer of the pattern, and the thermal transfer speed parameter is consistent with the speed parameter of the plate extrusion, and the step of setting the transfer pattern Before the step of cooling the setting.

The technical effect of the embodiment is that since the plate which has just been co-extruded has the large heat after the co-extrusion of the wood-plastic composite, the plate is still in a high temperature state inside and outside the wood-plastic composite material, and the co-extruded plate is The thermal transfer decorative processing not only makes the decorative processing process save energy without additional heating of the sheet, but also makes the thermal transfer decorative layer obtained by thermal transfer more firmly because of the high temperature hot processing; ordinary thermal transfer The pressure applied to the surface of the object is generally 4 to 6 kg/cm ² to ensure that the thermal transfer decorative layer adheres firmly to the printed matter, and the phenomenon of pattern deformation and the printing layer is too thin, and the method of the present invention is used. If the plate has not been completely cooled and solidified, it is only necessary to use a pressure of 0.1 to 5 kg/cm ² in the process of transferring the pattern to make the thermal transfer decorative layer adhere to the plate firmly and uniformly, and obtain better performance; In addition, the step of setting the cooling setting after the step of transferring the pattern is completed is advantageous for obtaining a thermoplastic wood-plastic composite shell layer having a uniform thickness, which can make the appearance of the wood-plastic composite floor more smooth and smooth. More stable, the sheet material can obtain a surface having a stable performance.

Embodiment 8: The difference between this embodiment and Embodiment 7 is that the thermoplastic wood-plastic composite masterbatch in step b is obtained by the following steps: weigh 30-60 parts of thermoplastics, 40~ by mass parts. 70 parts of lignocellulosic material, 0-8 parts of reinforcing material, 1-10 parts of coupling agent or interfacial compatibilizer, 0.1-6 parts of lubricant, 0-6 parts of coloring agent, 0.1-3 parts Anti-aging agent, 0～7 parts of heat stabilizer, 0～20 parts of flame retardant, 0～15 parts of mineral filler, put the weighed raw materials into high-speed mixer, control temperature is 25°C～ The thermoplastic wood-plastic composite masterbatch is obtained by mixing at 500 ° C for 5 min to 20 min, and the wood-plastic composite masterbatch directly enters the co-extrusion equipment to participate in co-extrusion.

The technical effect of the embodiment is that by using the above method to manufacture a thermoplastic wood-plastic composite masterbatch, a wood-plastic composite material with sufficient mixing, uniform material, good fluidity and stable performance can be obtained with minimum energy consumption, so that The wood-plastic composite decorative board can make the wood-plastic composite decorative board base material uniform in color, small in color difference and stable in performance, and it is not easy to cause warping deformation of wood-plastic composite decorative board due to internal stress of wood-plastic composite material. The wood-plastic composite masterbatch directly enters the co-extrusion equipment to participate in co-extrusion, which helps to reduce operational complexity, reduce worker workload, reduce energy consumption, and improve production efficiency of wood-plastic composite decorative panels.

BEST MODE FOR CARRYING OUT THE INVENTION 9: The difference between this embodiment and Embodiment 8 is that the thermoplastic wood-plastic composite masterbatch in step b also needs to be obtained by cooling the wood-plastic composite material mixed by a high-speed mixer. At room temperature, a premix is obtained, and the premix is placed in a twin-screw granulator at a controlled temperature of 145 ° C to 235 ° C, a rotation speed of 30 r / min to 100 r / min, and then obtained by cooling and cutting process. Granular wood-plastic composite masterbatch, the granular wood-plastic composite masterbatch is reserved.

The technical effect of the embodiment is that: by adjusting the temperature and the rotation speed of the twin-screw granulator, the above-mentioned thermoplastic wood-plastic composite material is properly melted without destroying the lignocellulosic material. The properties and effects of reinforcing materials, coupling agents or interfacial compatibilizers, lubricants, colorants, anti-aging agents, heat stabilizers, flame retardants and mineral fillers in wood-plastic composite decorative panels are produced by the above method. The thermoplastic wood-plastic composite masterbatch and the use of the granular wood-plastic composite masterbatch obtained by the method to manufacture the wood-plastic composite decorative board can better realize the melt extrusion process in the step b, since the granular wood-plastic material will be prepared The process of the composite masterbatch is separated from the other processes in step b, so that the preparation of the masterbatch and the co-extrusion process may not be completed at the same time, thereby making the extrusion process of the wood-plastic composite decorative panel easy to control, so that the co-extrusion The quality of wood-plastic composite decorative board products is more stable and reliable.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 10: This embodiment differs from Embodiment 8 in that the thermoplastic described in step b is polypropylene, polyethylene, polystyrene, acrylonitrile-butadiene-styrene copolymer and polychlorinated a mixture of one or more of ethylene, or a thermoplastic which is a maleic anhydride graft modified product of one or a mixture of polypropylene, polyethylene, polystyrene, a thermoplastic being a raw material, a recycled material Or a mixture of a raw material and a recycled material; the lignocellulosic material is a mixture of one or more of wood fiber powder, rice husk powder, bamboo fiber powder, hemp fiber powder, cotton fiber powder, and straw fiber powder; The reinforcing material is polyamide fiber, polyester fiber or carbon fiber; the coupling agent is a silane coupling agent, a titanate coupling agent, maleic anhydride, maleic anhydride grafted polyolefin and isocyanate a mixture of one or more of the following; the lubricant is a mixture of one or more of polyethylene wax, polypropylene wax, paraffin wax, stearic acid, zinc stearate, and calcium stearate; Colorant for oxidation a mixture of one or more of titanium dioxide, carbon black, indigo blue, and indigo green; the anti-aging agent is UV absorber UV-9, UV absorber UV-P, UV absorber UV-326, UV absorber UV327, UV absorber UV328, UV absorber UV329, UV absorber UV531, antioxidant tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propanoate] pentaerythritol ester, β -(3,5-di-tert-butyl-4-hydroxyphenyl)propionic acid n-octadecyl ester, antioxidant 2,6-di-tert-butyl-4-methylphenol, antioxidant 2,2 ,-methylene-bis(4-methyl-6-tert-butylphenol), antioxidant tris(2,4-di-tert-butylphenyl)phosphite, and 4,4,-thiobis ( a mixture of one or more of 3-methyl-6-tert-butylphenol; the heat stabilizer is dibutyltin dilaurate, dioctyltin dilaurate, dialkyltin maleate, bis ( Monobutyl maleate) dibutyltin, dioctyltin maleate, dioctyltin bis(isobutyl thioglycolate) or dioctyltin bis(isooctyl thioglycolate); the flame retardant is ammonium polyphosphate, boric acid Or metaboric acid, sodium octaborate, zinc borate And a mixture of one or more of expandable graphite; the mineral filler is calcium carbonate powder, calcium silicate powder, talc a mixture of one or more of powder and hot fly ash.

The technical effect of the embodiment is that the above embodiment solves the problem of compatibility between different plastic components in the waste plastic, and can use an inexpensive mixture, and on the other hand, solves the problem of plastic and lignocellulosic materials. A high-performance wood-plastic composite material with compatibility problems. The wood-plastic composite flooring produced by this method is beneficial to the recycling of recycled plastics and biomass waste, thereby helping to reduce the wood-plastic composite floor. The manufacturing cost, and the wood-plastic composite floor produced by the method can be recycled, crushed, melted and put into use after being discarded; using the method to manufacture the wood-plastic composite floor can also make the floor end face closed without using glue The adhesive is melt-bonded with a thermoplastic, thereby avoiding the problem that the adhesive is not resistant to water due to the end face closure, and the adhesive is not safe to release the adhesive.

BEST MODE FOR CARRYING OUT THE INVENTION 11: The present embodiment differs from any of Embodiments 1 to 10 in that it further includes a step of dip-coating a paraffin or a water repellent paint on the end surface in a step e of closing the end surface.

The technical effect of the embodiment is that the process of dip-coating the paraffin or the waterproof coating on the exposed wooden core is simple and convenient to realize the industrial operation, and the waterproof and moisture-proof of the end portion can be effectively realized, thereby ensuring the quality of the wood-plastic composite decorative panel.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT 12: A method for manufacturing a wood-plastic composite decorative panel according to the present embodiment is: preparing a wood core having a cross section of 20 mm×20 mm by pine shaving; and weighing 38 high density poly by mass parts. Ethylene plastic, 62 parts of 40-80 mesh wood fiber powder, 1 part polyester fiber, 3 parts of silane coupling agent, 1 part of polyethylene wax, 1 part of graphite, 1 part of UV absorber UV-9, 1 part of laurel Dibutyltin acid, 1.5 parts of expandable graphite, 5 parts of calcium carbonate powder, the weighed raw materials are placed in a high-speed mixer, the temperature is controlled at 100 ° C, mixed for 15 min to obtain a thermoplastic wood-plastic composite masterbatch, which can be fed through The wood core co-extrusion device melts the wood-plastic composite masterbatch and coextrudes the sheet with the wood core; performs thermal transfer processing on the extruded sheet; and performs thermal transfer processing The plate is cooled and shaped; the plate is cut to length; the end face of the plate is closed.

The technical effect of the embodiment is that the preparation of the wood core composite by using the pine wood square and the wood fiber powder of 40-80 mesh is beneficial to improve the creep resistance of the board.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT 13: A method for manufacturing a wood-plastic composite decorative panel according to the embodiment is: selecting a solid wood rotary-cut veneer, applying a vinyl acetate emulsion on the surface of the veneer, and crossing the veneer texture according to the veneer texture Laminated assembled panels, pressure applied to the blanks and allowed to stand to obtain a laminate, which is dried, and the dried laminate is cut to obtain a laminate having a cross-section of 20 mm×20 mm. a wooden core, which is processed by a milling head at both ends of the dried laminated wood core to obtain mutually matching finger joints, and then the mutually matching finger joints are treated with melamine-urea, urea-formaldehyde or phenolic glue, and then Applying opposing pressure to both ends of the laminate wood core to make the wood core of the laminate spliced end to end to obtain a wood core; weighing 40 parts of polypropylene plastic and 60 parts of 40-80 mesh wood fiber powder by mass parts. 4 parts of coupling agent or interfacial compatibilizer, 1.5 parts of lubricant, 1 part of anti-aging agent, 1 part of heat stabilizer, put the weighed raw materials into high-speed mixer, control temperature is 105 ° C, mix for 20 min Obtaining a thermoplastic wood-plastic composite masterbatch, melting the wood-plastic composite masterbatch by co-extrusion equipment that can feed the wood core, and coextruding the sheet with the wood core; Plate for thermal transfer processing; will be subjected to thermal transfer processing Cooling and shaping plate material; length limitation no longer than 2.4 meters plate, the plate material fixed length truncation; the end face plate for blocking.

The technical effect of the embodiment is that the wood-plastic composite decorative board is prepared by adopting the embodiment, so that the creep resistance and the heat deformation resistance of the decorative board are further improved, and the aging test has no penetration and no deformation.

Industrial applicability

By feeding the wood core in the co-extrusion device and coextruding the wood-plastic composite masterbatch with the wood core, the wood core replaces a part of the wood plastic to reduce the overall density of the decorative board, due to the wood core to the wood-plastic The shortcomings of the wood plastics that are easily creepable are greatly weakened, so that the wood-plastic composite decorative board can be used normally under the condition of a certain temperature difference without being affected by the creep of wood plastic; by co-extrusion and after cutting The end face of the plate block is closed, which can solve the problem that the water molecules in the air enter the glue layer or the wood cells, so that the decorative plate has water resistance, avoiding the problems of cracking, warping, deformation, strength drop and mildew decay of the decorative plate. Normally, in order to facilitate the operation, the production of ordinary wood-plastic composite materials is cooled immediately after extrusion of the sheet material, and then subjected to decorative processing after being cooled, and the present invention is carried out on the sheet material extruded in step b. The decorative processing and cooling of the sheet after the step c of the decorative processing is completed, so that the wood-plastic composite has a longer time for the slow knot after the co-extrusion operation. Promote the uniformity and regularity of the crystalline polymer matrix, to reduce the internal stress and may decrease decorative wood-plastic composite plate is deformed and bent, help to improve the mechanical properties and dimensional stability of wood-plastic composite trim panel. DETAILED DESCRIPTION OF THE INVENTION 1 The relevant performance indicators of 2-13 products are shown in Table 1.

Table 1 Specific implementation mode 12-13 product related performance indicators

材料material	抗弯强度(MPa)Bending strength (MPa)	弯曲弹性模量(GPa)Flexural modulus of elasticity (GPa)	弯曲极限载荷(N)Bending ultimate load (N)	蠕变恢复率(%)Creep recovery rate (%)
普通木塑板Ordinary wood-plastic board	22-2522-25	3~53~5	130~190130~190	7575
具体实施方式12DETAILED DESCRIPTION 12	80~9580~95	12~1512~15	400~650400~650	85.585.5
具体实施方式13DETAILED DESCRIPTION 13	85~10085~100	16~2116~21	700~850700~850	9090

Note: The above ordinary wood-plastic board has not been co-extruded with the wood core and does not contain wood core.

It should be noted that the above embodiments are merely illustrative of the technical solutions of the present invention, and are not intended to be limiting; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art will understand that The technical solutions described in the foregoing embodiments may be modified, or some or all of the technical features may be equivalently replaced; and the modifications or substitutions do not deviate from the technical solutions of the embodiments of the present invention. range.

Claims

A method for manufacturing a wood-plastic composite decorative panel, comprising: step a, preparing a wood core; step b, preparing a thermoplastic wood-plastic composite masterbatch, and passing through a co-extrusion device that can feed the wood core The wood-plastic composite masterbatch is melted, and the molten masterbatch and the wood core are co-extruded into a wood core-external wood-plastic sheet; in step c, the sheet extruded through the step b is performed. The decorative processing; in step d, the decorative processed sheet is cooled and shaped; in step e, the cooled shaped sheet is cut off; and in step f, the end surface of the sheet in step e is closed.
The method for manufacturing a wood-plastic composite decorative panel according to claim 1, wherein the decorative processing described in the step c is performed after the sheet is melt-co-extruded, and the thermal transfer decorative layer is adhered to the thermal transfer device. The outer surface of the plate realizes thermal transfer of the pattern, and the pressure between the thermal transfer decorative layer and the plate in the process of transferring the pattern to the outer surface of the plate is 0.1-5 kg/cm 2 , and the thermal transfer speed parameter and The speed parameters of the sheet extrusion are kept consistent, and the step of transferring the pattern is set before the step of cooling the setting.
The method for manufacturing a wood-plastic composite decorative panel according to claim 1, wherein the wood core processing method in the step a is: first selecting a solid wood rotary cutting veneer, and applying vinyl acetate on the surface of the veneer An emulsion, an acrylic resin, an acrylic-urethane resin, an isocyanate, a melamine-urea aldehyde, a urea-formaldehyde sol, or a phenolic aldehyde, and then the laminated panels are cross-laminated in a warp and weft direction according to the veneer texture, after which the pressure is applied to the blank and allowed to stand. A laminate is obtained, and the laminate is further subjected to a drying treatment, and the dried laminate is cut to obtain the wood core.
The method for manufacturing a wood-plastic composite decorative panel according to claim 1, 2 or 3, wherein the step of coextruding the sheet in step b requires simultaneous feeding of a plurality of wood cores in parallel by a co-extrusion apparatus, said parallel The fed wood core and the wood core are not in direct contact with each other and separated by a certain distance, and the molten wood-plastic composite masterbatch is coextruded with a plurality of the wood cores.
The method of manufacturing a wood-plastic composite decorative panel according to claim 4, wherein the co-extrusion device according to step b comprises a wood-plastic extruder, a co-extrusion die, and a wood core conveying device, wherein the co-extrusion die has Mold body, multiple wood core common feeding end, wood plastic whole board At the material end, the co-extrusion die is installed on the head of the wood-plastic extruder in step b, so that the plurality of wood core co-feed ends and the wood-plastic whole plate discharge end are in the same plane And disposed in the same direction, wherein the plurality of wood core co-feeding ends and the wood-plastic whole plate discharge ends are respectively located on two sides of the co-extrusion die, thereby further melting the thermoplastic wood-plastic composite material mother The wood core is coated in a co-extrusion mold to obtain a coextruded sheet wrapped with a thermoplastic wood-plastic composite material and having a plurality of wood cores.
The method for manufacturing a wood-plastic composite decorative panel according to claim 5, wherein the co-extrusion die used in step b further comprises a wood core guiding rib, a co-extruded flow channel, and a split flow channel on the mold body. The inner wall of the wood core feeding end is provided with a plurality of the wood core guiding edges, and the coextrusion flow channel is circumferentially distributed along the inner wall of the feeding end of the wood core and communicates with the inner wall of the feeding end of the wood core a plurality of the split flow passages are connected to each other, the split flow passage is a tapered flow passage, and a corner exists at an intersection of the plurality of split flow passages, the split flow passage and the wooden core on the mold body The feed end is in communication, and the profile discharge end on the mold body is wrapped around the coextrusion flow passage.
The method for manufacturing a wood-plastic composite decorative panel according to claim 4, wherein the thermoplastic wood-plastic composite masterbatch in the step b is obtained by the following steps: weighing 30 to 60 parts of thermoplastics by mass parts. Plastic, 40 to 70 parts of lignocellulosic material, 0 to 8 parts of reinforcing material, 1 to 10 parts of coupling agent or interfacial compatibilizer, 0.1 to 6 parts of lubricant, 0 to 6 parts of coloring agent, 0.1 ～3 parts of anti-aging agent, 0～7 parts of heat stabilizer, 0～20 parts of flame retardant, 0～15 parts of mineral filler, put the weighed raw materials into high-speed mixer, control temperature The thermoplastic wood-plastic composite masterbatch is obtained by mixing at 25 ° C to 130 ° C for 5 min to 20 min.
The method for manufacturing a wood-plastic composite decorative panel according to claim 7, wherein the thermoplastic wood-plastic composite masterbatch in step b is further prepared by the step of mixing the wood by a high-speed mixer. The plastic composite is cooled to room temperature to obtain a premix, and the premix is placed in a twin-screw granulator at a temperature of 145 ° C to 235 ° C, a rotation speed of 30 r / min to 100 r / min, and then cooled. And the cutting process results in a granular wood-plastic composite masterbatch.
A wood-plastic composite decorative board, which is formed from a thermoplastic wood-plastic composite material by a melt extrusion process, and is characterized in that: a shell layer composed of a thermoplastic wood-plastic composite material and a core layer composed of a plate-shaped wood core, a core layer composed of a plate-like wood core is covered by the thermoplastic wood-plastic composite shell layer, and the core layer end portion of the plate-shaped wood core has a sealing layer connected to the shell layer, and the shell layer has a shell layer outside A decorative layer printed by thermal transfer technology.
A wood-plastic composite decorative board according to claim 9, wherein the plate-shaped wood core is a solid wood rotary-cut veneer which is laminated by a glue, and the shell layer is covered by a plurality of wood cores. a plurality of core layers, the plurality of wood cores being parallel to each other and not in direct contact, and the wood core and the wood core are separated by a certain distance.