CN110126052A - A kind of high-intensitive, high stability wood-plastic clad plate and preparation method thereof - Google Patents
A kind of high-intensitive, high stability wood-plastic clad plate and preparation method thereof Download PDFInfo
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- CN110126052A CN110126052A CN201910470053.2A CN201910470053A CN110126052A CN 110126052 A CN110126052 A CN 110126052A CN 201910470053 A CN201910470053 A CN 201910470053A CN 110126052 A CN110126052 A CN 110126052A
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- 238000000034 method Methods 0.000 claims abstract description 18
- 238000002156 mixing Methods 0.000 claims abstract description 17
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims abstract description 14
- XOOUIPVCVHRTMJ-UHFFFAOYSA-L zinc stearate Chemical compound [Zn+2].CCCCCCCCCCCCCCCCCC([O-])=O.CCCCCCCCCCCCCCCCCC([O-])=O XOOUIPVCVHRTMJ-UHFFFAOYSA-L 0.000 claims abstract description 13
- 239000004408 titanium dioxide Substances 0.000 claims abstract description 7
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- 229920001587 Wood-plastic composite Polymers 0.000 claims description 54
- 239000011155 wood-plastic composite Substances 0.000 claims description 54
- 229920000092 linear low density polyethylene Polymers 0.000 claims description 27
- 239000004707 linear low-density polyethylene Substances 0.000 claims description 27
- 238000004519 manufacturing process Methods 0.000 claims description 21
- 238000000465 moulding Methods 0.000 claims description 17
- 235000013312 flour Nutrition 0.000 claims description 13
- 238000003756 stirring Methods 0.000 claims description 12
- 238000005498 polishing Methods 0.000 claims description 11
- 238000001035 drying Methods 0.000 claims description 10
- 238000005303 weighing Methods 0.000 claims description 10
- 230000001105 regulatory effect Effects 0.000 claims description 9
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- 239000007787 solid Substances 0.000 claims description 7
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- 238000001816 cooling Methods 0.000 claims description 2
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- 239000000463 material Substances 0.000 abstract description 7
- 239000000758 substrate Substances 0.000 abstract description 6
- 238000007598 dipping method Methods 0.000 abstract description 5
- 229920010126 Linear Low Density Polyethylene (LLDPE) Polymers 0.000 abstract description 2
- 239000004640 Melamine resin Substances 0.000 abstract 2
- 230000000052 comparative effect Effects 0.000 description 20
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- 238000012360 testing method Methods 0.000 description 1
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27N—MANUFACTURE BY DRY PROCESSES OF ARTICLES, WITH OR WITHOUT ORGANIC BINDING AGENTS, MADE FROM PARTICLES OR FIBRES CONSISTING OF WOOD OR OTHER LIGNOCELLULOSIC OR LIKE ORGANIC MATERIAL
- B27N3/00—Manufacture of substantially flat articles, e.g. boards, from particles or fibres
- B27N3/002—Manufacture of substantially flat articles, e.g. boards, from particles or fibres characterised by the type of binder
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27N—MANUFACTURE BY DRY PROCESSES OF ARTICLES, WITH OR WITHOUT ORGANIC BINDING AGENTS, MADE FROM PARTICLES OR FIBRES CONSISTING OF WOOD OR OTHER LIGNOCELLULOSIC OR LIKE ORGANIC MATERIAL
- B27N3/00—Manufacture of substantially flat articles, e.g. boards, from particles or fibres
- B27N3/08—Moulding or pressing
- B27N3/10—Moulding of mats
- B27N3/12—Moulding of mats from fibres
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27N—MANUFACTURE BY DRY PROCESSES OF ARTICLES, WITH OR WITHOUT ORGANIC BINDING AGENTS, MADE FROM PARTICLES OR FIBRES CONSISTING OF WOOD OR OTHER LIGNOCELLULOSIC OR LIKE ORGANIC MATERIAL
- B27N3/00—Manufacture of substantially flat articles, e.g. boards, from particles or fibres
- B27N3/08—Moulding or pressing
- B27N3/20—Moulding or pressing characterised by using platen-presses
- B27N3/203—Moulding or pressing characterised by using platen-presses with heating or cooling means
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L97/00—Compositions of lignin-containing materials
- C08L97/02—Lignocellulosic material, e.g. wood, straw or bagasse
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
- C08K2003/2237—Oxides; Hydroxides of metals of titanium
- C08K2003/2241—Titanium dioxide
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
- C08L2205/025—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
- C08L2205/035—Polymer mixtures characterised by other features containing three or more polymers in a blend containing four or more polymers in a blend
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Wood Science & Technology (AREA)
- Manufacturing & Machinery (AREA)
- Forests & Forestry (AREA)
- Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Dry Formation Of Fiberboard And The Like (AREA)
- Casting Or Compression Moulding Of Plastics Or The Like (AREA)
Abstract
The present invention provides a kind of high-intensitive, high stability wood-plastic clad plates, including substrate and the decorating film for being covered on substrate surface, wherein, the substrate after following components mixing by weight by suppressing: 10~15 parts of pine powder, 10~15 parts of fir powder, 40~70 parts of Poplar Powder, 10~40 parts of melamine resin, 0.6~1.0 part of linear low density polyethylene (LLDPE), 0.01~0.2 part of titanium dioxide, 0.01~0.08 part of zinc stearate；The decorating film is made by the solid-state paper of melamine resin dipping.The present invention is reasonably combined by each component material, and combine the hot-forming optimal control to the technological parameters condition such as temperature, pressure in the process, so that wood-plastic clad plate items strength and stability index of the invention is far superior to the level of national standard, therefore greatly extend the application range of wood-plastic clad plate of the present invention.
Description
Technical Field
The invention belongs to the technical field of synthetic boards, and particularly relates to a high-strength and high-stability wood-plastic composite board and a manufacturing method thereof.
Background
The wood-plastic composite board is a novel synthetic board which is briskly developed in recent years, is prepared by mixing wood powder and plastic according to a certain proportion and then performing hot press molding, and has better strength and processing performance than the traditional wood board and other synthetic boards. Wherein, the wood powder is generally prepared by mixing waste plant fibers such as wood powder with high wood fiber content (such as pine wood powder, poplar wood powder, fir wood powder, bamboo wood powder and the like), rice hull, straw and the like. The plastic is usually thermosetting plastic such as amino resin, epoxy resin, etc., or thermoplastic such as High Density Polyethylene (HDPE), polypropylene (PP), polyvinyl chloride (PVC), etc.
However, due to the difference between the physical and chemical properties of wood flour and plastic, in the hot press molding process, if problems occur in the matching and fusion of the material components, the strength and processability of the board are easily poor, such as poor indexes of board surface nail-holding power, surface hardness, bending resistance and the like; on the other hand, if the thermal stress is gathered, the indexes of the plate, such as quality stability, size stability, surface flatness, surface bonding strength and the like, are poor, the plate is partially warped, and the decorative film is easy to wrinkle, peel, fall and the like.
Disclosure of Invention
In view of the above defects in the prior art, the present invention aims to provide a high-strength and high-stability wood-plastic composite board and a manufacturing method thereof, wherein through reasonable collocation of the components and materials and combined with optimized control of technological parameters such as temperature and pressure in the hot press molding process, various strength and stability indexes of the wood-plastic composite board are far superior to the national standard level, and therefore, the application range of the wood-plastic composite board is greatly expanded.
In order to achieve the above object, in one aspect, the present invention provides a high-strength and high-stability wood-plastic composite board, including a substrate and a decorative film covering a surface of the substrate, wherein the substrate is formed by mixing and pressing the following components by weight: 10-15 parts of pine wood powder, 10-15 parts of fir wood powder, 40-70 parts of poplar wood powder, 10-40 parts of melamine formaldehyde resin, 0.6-1.0 part of Linear Low Density Polyethylene (LLDPE), 0.01-0.2 part of titanium dioxide and 0.01-0.08 part of zinc stearate; the decorative film is made of solid paper impregnated with melamine formaldehyde resin.
Further, the linear low density polyethylene is powdery, and the melting point of the linear low density polyethylene is preferably 120-125 ℃.
On the other hand, the invention also provides a manufacturing method of the high-strength and high-stability wood-plastic composite board, which comprises the following steps:
(1) drying: drying pine wood powder, fir wood powder and poplar wood powder;
(2) weighing: accurately weighing 10-15 parts of dried pine wood powder, 10-15 parts of Chinese fir powder, 40-70 parts of poplar powder, 10-40 parts of melamine formaldehyde resin, 0.6-1.0 part of linear low density polyethylene, 0.01-0.2 part of titanium dioxide and 0.01-0.08 part of zinc stearate by weight;
(3) mixing and stirring: mixing and uniformly stirring pine wood powder, fir wood powder, poplar wood powder, melamine formaldehyde resin, linear low-density polyethylene, titanium dioxide and zinc stearate weighed in the step (2);
(4) entering a mould to paste paper: introducing the uniformly stirred mixture obtained in the step (3) into a mould, and covering a decorative film on the surface of the mixture, wherein the decorative film is made by dipping melamine formaldehyde resin into solid paper;
(5) hot-press molding: and carrying out hot press molding on the contents in the die at the temperature of 130-150 ℃ and under the pressure of 8-23 MPa to obtain the high-strength and high-stability wood-plastic composite board.
Further, the manufacturing method can further comprise the following steps:
(6) finishing and polishing: and (5) finishing, polishing and deburring the high-strength and high-stability wood-plastic composite board obtained in the step (5), and finally forming a finished product of the wood-plastic composite board.
Further, the moisture content of the pine wood powder, the cedar wood powder and the poplar wood powder dried in the step (1) is preferably 3-20%. The too high water content of the wood powder is easy to cause plate explosion; the water content is too low, so that the control is difficult in the production process, and the water content can ensure that the wood-plastic composite board has no bubbling and layering and has higher hardness.
Further, the weight of the linear low density polyethylene in the step (2) is preferably about 1% of the sum of the weight of pine wood flour, fir wood flour and poplar wood flour. For example, when 10 parts of pine wood flour, 10 parts of cedar wood flour, and 40 parts of poplar wood flour are used, the linear low density polyethylene is about 0.6 part; when the pine wood powder is 15 parts, the Chinese fir wood powder is 15 parts and the poplar wood powder is 70 parts, the linear low density polyethylene is about 1.0 part.
Further, the stirring in the step (3) is performed by a swing side-blown stirrer or a ribbon stirrer, preferably a swing side-blown stirrer. The stirring time is preferably 2-4 h so as to achieve the ideal water content and uniform mixing degree.
Further, in the hot press molding process in the step (5), the temperature control is divided into three stages, namely an initial temperature rise stage, a constant temperature stage and a final temperature reduction stage. The pressure control is also divided into three stages, namely an initial pressure increasing stage, a pressure regulating stage and a final pressure reducing stage.
Further, regarding temperature control, the temperature in the mold is raised from the ambient temperature to a set temperature T in an initial temperature raising stage, wherein the temperature raising time is TT(ii) a Then entering a constant temperature stage, keeping the temperature in the die at the set temperature T unchanged until the pressure maintaining stage is finished(ii) a And then entering a final cooling stage, and reducing the temperature in the die from the set temperature T to the ambient temperature. Preferably, the initial warming phase employs a linear warming, i.e. the warming rate is substantially constant. Preferably, the temperature fluctuation in the constant temperature stage should be controlled to be less than 3 ℃.
Further, regarding the pressure control, the initial pressure increasing stage increases the pressure in the mold from the ambient pressure (about 0.1MPa) to the initial holding pressure of the set pressure adjusting stage, and the pressure increasing time is t0(ii) a Then entering a pressure regulating stage, and regulating the pressure in the mold according to a set pressure curve, for example, respectively setting different pressures and maintaining the pressure for a period of time; after the pressure maintaining is finished, in the final pressure reduction stage, the pressure in the die is reduced to the environmental pressure from the final pressure maintaining pressure in the pressure regulating stage.
Preferably, the maximum pressure P on the pressure curve ismaxThe following relationship is approximately numerically (in MPa) to the set temperature T (in c): pmax3000/T. For example, when the set temperature T is 130 ℃, the maximum pressure Pmax3000/130 ≈ 23 MPa; when the set temperature T is 140 ℃, the maximum pressure Pmax3000/140 ≈ 21 MPa; when the set temperature T is 150 ℃, the maximum pressure Pmax3000/150 MPa. The numerical relation is successful experience obtained by a large number of experiments of the inventor, and very obvious effects can be obtained in a temperature range of 130-150 ℃, namely the strength and the stability of the obtained wood-plastic composite board are good.
Preferably, the initial warm-up phase and the initial boost phase start at the same time, but the initial warm-up phase ends before the initial boost phase or both ends at approximately the same time, i.e. tT≤t0This ensures that the temperature in the mould is substantially constant throughout the pressure regulation stage. Preferably, t isT≤t0≤3min。
Preferably, in the initial temperature rising stage and the initial pressure rising stage, at least one mold opening and air discharging operation is further included to avoid thermal stress concentration caused by excessive pressure in the mold, so as to ensure the surface flatness and the stability of strength and quality of the wood-plastic composite board. The operation of mold opening and air discharging is preferably 2-3 times, for example, once per minute.
Preferably, the pressure regulating stage includes five pressure maintaining stages, which are a first pressure maintaining stage, a second pressure maintaining stage, a third pressure maintaining stage, a fourth pressure maintaining stage and a fifth pressure maintaining stage. The first pressure maintaining stage sets the pressure to be a first pressure P1The dwell time is the first dwell time t1(ii) a Setting the pressure in the second pressure maintaining stage as the second pressure P2The dwell time is a second dwell time t2(ii) a Setting the pressure at the third pressure maintaining stage to be a third pressure P3The dwell time is the third dwell time t3(ii) a The fourth pressure maintaining stage sets the pressure to be a fourth pressure P4The dwell time is the fourth dwell time t4(ii) a The pressure is set to be the fifth pressure P in the fifth pressure maintaining stage5The dwell time is the fifth dwell time t5. Wherein, P1<P2<P4，P1<P3<P2And P is5<P1. This pressure curve, in which P is the successful experience of the inventors in a number of experiments on the formulations of the invention, is also the casemaxIs P4However, P1、P2、P3、P4Instead of being incrementally larger as in the typical prior art, a pressure callback process (i.e., P) is included3) This is to relieve possible thermal stresses inside the board on the one hand and to relieve possible stresses of the thermoplastic component LLDPE on the other hand, so that the surface flatness and stability of strength and quality of the wood-plastic composite board are further enhanced, in particular the flexural modulus of elasticity.
Preferably, P1＝11～14MPa，P2＝17～20MPa，P3＝14～17MPa，P4＝20～23MPa，P58-11 MPa. Preferably, t is1＝45～90s，t2＝45～90s，t3＝45～90s，t4＝45～90s，t5＝45～90s。
Further, the polishing in the step (6) adopts the drilling gypsum and the No. 320-800 oilstone to sequentially and repeatedly polish to the precision of 0.008 microns, so that the finished wood-plastic composite board is ensured to achieve high flatness, no bubbling, no scratch, no surface indentation, no bottom penetration, no pinhole gap, no color seam and no corner defect.
The beneficial technical effects of the invention are at least shown in the following aspects:
(1) the present invention innovatively adds thermoplastic LLDPE to systems with thermoset melamine formaldehyde resins, a combination which is considered to be avoided in the prior art. Since thermoplastics and thermosets generally differ greatly in their physical and chemical properties, such as molecular structure, polarity, rheology, etc., one skilled in the art will generally avoid mixing the two. Second, although polyethylene is also used in the prior art to make wood-plastic composite panels, it is not usually mixed with thermosetting plastics, and high density polyethylene HDPE is used instead of LDPE or LLDPE for strength. In fact, the LLDPE and the melamine formaldehyde resin are mixed in the invention, not intentionally, but because workers take a hopper with the LLDPE left in the production process by mistake, however, the performance of the prepared wood-plastic composite board is found not to be reduced as expected, but is obviously enhanced. Therefore, the inventors further studied the system and conducted a large number of experiments to find out the successful experience of the present invention.
(2) The system of the invention only needs to add a small amount of LLDPE, and the obtained wood-plastic composite board achieves unexpected good effects on strength and stability, and indexes such as board surface nail-holding power, surface hardness, bending strength, bending elastic modulus, surface bonding strength and the like are far superior to the national standard level.
(3) The LLDPE has low price and small dosage, and the control method of parameters such as pressure, temperature and the like in the hot press molding process is simple, can be finished by using the existing equipment without additional investment, so that the performance of the plate can be greatly enhanced under the condition of hardly increasing the cost of the plate, and the invention has good economic benefit.
Drawings
FIG. 1 is a schematic view of a pressure curve used in the hot press molding process of examples 1 to 3 of the present invention;
wherein the time on the abscissa in FIG. 1 is not scaled, merely for visual and aesthetic reasons, and in fact the scale on the abscissa of each of embodiments 1-3 may be different, i.e., t for each of embodiments 1-30、t1、t2、t3、t4、t5May be different.
Detailed Description
The following examples are given to illustrate the present invention in detail, and the following examples are given to illustrate the detailed embodiments and specific procedures of the present invention, but the scope of the present invention is not limited to the following examples.
Example 1
In a preferred embodiment, the manufacturing method of the high-strength and high-stability wood-plastic composite board comprises the following steps:
(1) drying: drying pine wood powder, fir wood powder and poplar wood powder to the moisture content of about 5%;
(2) weighing: accurately weighing 15 parts of dried pine wood powder, 15 parts of Chinese fir powder, 70 parts of poplar wood powder, 40 parts of melamine formaldehyde resin, 1.0 part of linear low-density polyethylene, 0.2 part of titanium pigment and 0.08 part of zinc stearate by weight;
(3) mixing and stirring: adding the pine wood powder, the fir wood powder, the poplar wood powder, the melamine formaldehyde resin, the linear low-density polyethylene, the titanium pigment and the zinc stearate weighed in the step (2) into a swing side-blowing type stirrer, and mixing and stirring for 3 hours;
(4) entering a mould to paste paper: introducing the uniformly stirred mixture obtained in the step (3) into a mould, and covering a decorative film on the surface of the mixture, wherein the decorative film is made by dipping melamine formaldehyde resin into solid paper;
(5) hot-press molding: carrying out hot press molding on the contents in the mold at the temperature of 150 ℃ and under the pressure of 8-20 MPa to obtain the high-strength and high-stability wood-plastic composite board; as shown in fig. 1, the specific parameters of the pressure curve of example 1 are: t is t0＝tTAnd t is0Opening the mould and deflating for 3 times; p1＝11MPa，P2＝17MPa，P3＝14MPa，P4＝20MPa，P5＝8MPa，t1＝t2＝t3＝t4＝t5＝90s；
(6) Finishing and polishing: and (4) sequentially and repeatedly polishing the high-strength and high-stability wood-plastic composite board flash obtained in the step (5) to the precision of 0.008 microns by adopting the diamond gypsum and the No. 320-800 oilstone, and finally forming a finished product of the wood-plastic composite board.
Example 2
In a preferred embodiment, the manufacturing method of the high-strength and high-stability wood-plastic composite board comprises the following steps:
(1) drying: drying pine wood powder, fir wood powder and poplar wood powder to the moisture content of about 10%;
(2) weighing: accurately weighing 12 parts of dried pine wood powder, 13 parts of Chinese fir powder, 55 parts of poplar powder, 30 parts of melamine formaldehyde resin, 0.8 part of linear low-density polyethylene, 0.1 part of titanium pigment and 0.05 part of zinc stearate by weight;
(3) mixing and stirring: adding the pine wood powder, the fir wood powder, the poplar wood powder, the melamine formaldehyde resin, the linear low-density polyethylene, the titanium pigment and the zinc stearate weighed in the step (2) into a swing side-blowing type stirrer, and mixing and stirring for 4 hours;
(4) entering a mould to paste paper: introducing the uniformly stirred mixture obtained in the step (3) into a mould, and covering a decorative film on the surface of the mixture, wherein the decorative film is made by dipping melamine formaldehyde resin into solid paper;
(5) hot-press molding: carrying out hot press molding on the contents in the mold at the temperature of 140 ℃ and under the pressure of 9-21 MPa to obtain the high-strength and high-stability wood-plastic composite board; as shown in fig. 1, the specific parameters of the pressure curve of example 2 are: t is t0＝tTAnd t is0Opening the mould and deflating for 2 times; p1＝12MPa，P2＝18MPa，P3＝15MPa，P4＝21MPa，P5＝9MPa，t1＝t2＝t3＝t4＝t5＝60s；
(6) Finishing and polishing: and (4) sequentially and repeatedly polishing the high-strength and high-stability wood-plastic composite board flash obtained in the step (5) to the precision of 0.008 microns by adopting the diamond gypsum and the No. 320-800 oilstone, and finally forming a finished product of the wood-plastic composite board.
Example 3
In a preferred embodiment, the manufacturing method of the high-strength and high-stability wood-plastic composite board comprises the following steps:
(1) drying: drying pine wood powder, fir wood powder and poplar wood powder to water content of about 3%;
(2) weighing: accurately weighing 10 parts of dried pine wood powder, 10 parts of Chinese fir powder, 40 parts of poplar wood powder, 10 parts of melamine formaldehyde resin, 0.6 part of linear low-density polyethylene, 0.01 part of titanium pigment and 0.01 part of zinc stearate by weight;
(3) mixing and stirring: adding the pine wood powder, the fir wood powder, the poplar wood powder, the melamine formaldehyde resin, the linear low-density polyethylene, the titanium pigment and the zinc stearate weighed in the step (2) into a swing side-blowing type stirrer, and mixing and stirring for 2 hours;
(4) entering a mould to paste paper: introducing the uniformly stirred mixture obtained in the step (3) into a mould, and covering a decorative film on the surface of the mixture, wherein the decorative film is made by dipping melamine formaldehyde resin into solid paper;
(5) hot-press molding: carrying out hot press molding on the contents in the mold at the temperature of 130 ℃ and under the pressure of 11-23 MPa to obtain the high-strength and high-stability wood-plastic composite board; as shown in fig. 1, the specific parameters of the pressure curve of example 3 are: t is t0＝tTAnd t is0Opening the mould and deflating for 1 time; p1＝14MPa，P2＝20MPa，P3＝17MPa，P4＝23MPa，P5＝11MPa，t1＝t2＝t3＝t4＝t5＝45s；
(6) Finishing and polishing: and (4) sequentially and repeatedly polishing the high-strength and high-stability wood-plastic composite board flash obtained in the step (5) to the precision of 0.008 microns by adopting the diamond gypsum and the No. 320-800 oilstone, and finally forming a finished product of the wood-plastic composite board.
Comparative examples 1 to 3
The manufacturing methods of the wood-plastic composite panels of comparative examples 1 to 3 are substantially the same as those of examples 1 to 3, respectively, except that the raw materials of comparative examples 1 to 3 do not contain linear low density polyethylene.
Comparative example 4
The manufacturing method of the wood-plastic composite board of the comparative example 4 is basically the same as that of the embodiment 1, and the difference is only that the set pressure of the five pressure maintaining stages of the hot press forming of the step (5) in the comparative example 4 is different, specifically as follows: p1＝11MPa，P2＝14MPa，P3＝17MPa，P4＝20MPa，P58 MPa. In the pressure curve of comparative example 4, P is compared to example 12And P3Is carried out at the set value ofExchange, i.e. P1、P2、P3、P4Is a step up, no pressure back-off process.
Comparative example 5
The manufacturing method of the wood-plastic composite board of the comparative example 5 is basically the same as that of the embodiment 2, and the difference is only that the set pressure of the five pressure maintaining stages of the hot press forming of the step (5) in the comparative example 5 is different, specifically as follows: p1＝12MPa，P2＝15MPa，P3＝18MPa，P4＝21MPa，P59 MPa. In the pressure curve of comparative example 5, P is compared to example 22And P3Are interchanged, i.e. P1、P2、P3、P4Is a step up, no pressure back-off process.
Comparative example 6
The manufacturing method of the wood-plastic composite board of the comparative example 6 is basically the same as that of the embodiment 3, and the difference is only that the set pressure of the five pressure maintaining stages of the hot press forming of the step (5) in the comparative example 6 is different, specifically as follows: p1＝14MPa，P2＝17MPa，P3＝20MPa，P4＝23MPa，P511 MPa. In the pressure curve of comparative example 6, P is compared with example 32And P3Are interchanged, i.e. P1、P2、P3、P4Is a step up, no pressure back-off process.
The strength and stability related performance indexes of the wood-plastic composite boards prepared in the examples and the comparative examples are tested according to the regulations of the national standard GB/T24137-2009 Wood-plastic decorative board, and the results are shown in the following table.
Table 1: test results of indexes related to strength and stability of wood-plastic composite boards of each embodiment and comparative example
As can be seen from the data in the above table, the indexes related to the strength and stability of the wood-plastic composite board prepared in the embodiments 1 to 3 of the present invention are far higher than the national standard, and the performance requirements of high strength and high stability are completely met, so that the application range of the wood-plastic composite board of the present invention is greatly expanded, and the wood-plastic composite board can be applied to scenes with high requirements on strength and stability, high-end furniture or equipment, and the like.
As can be seen from the comparison of examples 1-3, comparative examples 4-6 and comparative examples 1-3, the thermoplastic LLDPE was introduced in the present invention, but no significant effect was seen on the surface hardness and surface bond strength of the sheet.
As can be seen from comparison between examples 1-3 and comparative examples 1-6, the temperature and pressure curve scheme adopted in the hot press forming process of the invention can obviously enhance the indexes of the plate, such as plate surface nail holding capacity, bending strength, bending elasticity modulus and the like. In addition, the narrow range of the bending strength values (i.e. the difference between the average value and the minimum value) measured by sampling at different positions of the plate material indicates that the plate material can maintain consistent high strength at different positions of the plate material, i.e. the quality stability of the plate material is enhanced.
The foregoing detailed description of the preferred embodiments of the invention has been presented. It should be understood that numerous modifications and variations could be devised by those skilled in the art in light of the present teachings without departing from the inventive concepts. Therefore, the technical solutions available to those skilled in the art through logic analysis, reasoning and limited experiments based on the prior art according to the concept of the present invention should be within the scope of protection defined by the claims.
Claims (10)
1. The utility model provides a high strength, high stability wood-plastic composite board which characterized in that, wood-plastic composite board includes the base plate and covers the decorating film on base plate surface, wherein, the base plate is pressed after mixing by the following component by weight and is formed: 10-15 parts of pine wood powder, 10-15 parts of fir wood powder, 40-70 parts of poplar wood powder, 10-40 parts of melamine formaldehyde resin, 0.6-1.0 part of linear low density polyethylene, 0.01-0.2 part of titanium dioxide and 0.01-0.08 part of zinc stearate; the decorative film is made of solid paper impregnated with melamine formaldehyde resin.
2. The high-strength high-stability wood-plastic composite board according to claim 1, wherein the linear low-density polyethylene has a melting point of 120 to 125 ℃.
3. A manufacturing method of a high-strength and high-stability wood-plastic composite board is characterized by comprising the following steps:
(1) drying: drying pine wood powder, fir wood powder and poplar wood powder;
(2) weighing: accurately weighing 10-15 parts of dried pine wood powder, 10-15 parts of Chinese fir powder, 40-70 parts of poplar powder, 10-40 parts of melamine formaldehyde resin, 0.6-1.0 part of linear low density polyethylene, 0.01-0.2 part of titanium dioxide and 0.01-0.08 part of zinc stearate by weight;
(3) mixing and stirring: mixing and uniformly stirring pine wood powder, fir wood powder, poplar wood powder, melamine formaldehyde resin, linear low-density polyethylene, titanium dioxide and zinc stearate weighed in the step (2);
(4) entering a mould to paste paper: introducing the uniformly stirred mixture obtained in the step (3) into a mould, and covering a decorative film on the surface of the mixture, wherein the decorative film is made of melamine formaldehyde resin impregnated solid paper;
(5) hot-press molding: and carrying out hot press molding on the contents in the mold at the temperature of 130-150 ℃ and under the pressure of 8-23 MPa to obtain the high-strength and high-stability wood-plastic composite board.
4. The method for manufacturing a high-strength high-stability wood-plastic composite board according to claim 3, further comprising the steps of:
(6) finishing and polishing: and (5) finishing, polishing and deburring the high-strength and high-stability wood-plastic composite board obtained in the step (5), and finally forming a finished product of the wood-plastic composite board.
5. The method for manufacturing a high-strength and high-stability wood-plastic composite board according to claim 3 or 4, wherein the moisture content of the pine wood flour, fir wood flour and poplar wood flour dried in the step (1) is 3-20%.
6. A method for making a high-strength and high-stability wood-plastic composite board according to claim 3 or 4, wherein the weight of the linear low-density polyethylene in the step (2) is approximately 1% of the sum of the weight of pine wood flour, fir wood flour and poplar wood flour.
7. The manufacturing method of a high-strength and high-stability wood-plastic composite board according to claim 3 or 4, wherein in the hot press molding process in the step (5), the temperature control is divided into three stages, namely an initial temperature rise stage, a constant temperature stage and a final temperature drop stage; the pressure control is also divided into three stages, namely an initial pressure increasing stage, a pressure regulating stage and a final pressure reducing stage; wherein,
in the initial temperature rise stage, raising the temperature in the mold from the ambient temperature to a set temperature T for a temperature rise time TT(ii) a Then entering the constant temperature stage, and keeping the temperature in the mold unchanged at a set temperature T until the pressure maintaining stage is finished; then entering the final cooling stage, and reducing the temperature in the mold from a set temperature T to an ambient temperature;
in the initial pressure increasing stage, increasing the pressure in the mold from the ambient pressure to the set initial pressure maintaining pressure in the pressure regulating stage, wherein the pressure increasing time is t0(ii) a Then entering the pressure regulating stage, and regulating the pressure in the die according to a set pressure curve; in the final pressure reduction stage, reducing the pressure in the mold from the final holding pressure in the pressure regulation stage to the ambient pressure;
maximum pressure P on the pressure curvemaxThe values in MPa and the set temperature T in ° c have approximately the following relationship: pmax＝3000/T。
8. The high strength of claim 7The manufacturing method of the high-stability wood-plastic composite board is characterized in that the initial temperature rising stage and the initial pressure rising stage start at the same time, but the initial temperature rising stage ends earlier than the initial pressure rising stage or the initial pressure rising stage ends at approximately the same time, namely tT≤t0And t isT≤t0≤3min。
9. The method for manufacturing a high-strength high-stability wood-plastic composite board according to claim 8, further comprising at least one of opening the mold and deflating in the initial temperature rising stage and the initial pressure rising stage.
10. The method of manufacturing a high-strength high-stability wood-plastic composite board according to claim 9, wherein the pressure-regulating stage includes five pressure-maintaining stages, which are a first pressure-maintaining stage, a second pressure-maintaining stage, a third pressure-maintaining stage, a fourth pressure-maintaining stage and a fifth pressure-maintaining stage, respectively; wherein,
the first pressure maintaining stage sets the pressure to be a first pressure P1The dwell time is the first dwell time t1(ii) a The set pressure of the second pressure maintaining stage is a second pressure P2The dwell time is a second dwell time t2(ii) a The set pressure of the third pressure maintaining stage is a third pressure P3The dwell time is the third dwell time t3(ii) a The fourth pressure maintaining stage sets the pressure to be a fourth pressure P4The dwell time is the fourth dwell time t4(ii) a The pressure is set to be the fifth pressure P in the fifth pressure maintaining stage5The dwell time is the fifth dwell time t5(ii) a Wherein,
P1<P2<P4，P1<P3<P2and P is5<P1。
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