CN110643190A - Composition, base material, preparation method and wood-plastic composite decorative line - Google Patents
Composition, base material, preparation method and wood-plastic composite decorative line Download PDFInfo
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- CN110643190A CN110643190A CN201910926139.1A CN201910926139A CN110643190A CN 110643190 A CN110643190 A CN 110643190A CN 201910926139 A CN201910926139 A CN 201910926139A CN 110643190 A CN110643190 A CN 110643190A
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- 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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B21/00—Layered products comprising a layer of wood, e.g. wood board, veneer, wood particle board
- B32B21/02—Layered products comprising a layer of wood, e.g. wood board, veneer, wood particle board the layer being formed of fibres, chips, or particles, e.g. MDF, HDF, OSB, chipboard, particle board, hardboard
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B21/00—Layered products comprising a layer of wood, e.g. wood board, veneer, wood particle board
- B32B21/04—Layered products comprising a layer of wood, e.g. wood board, veneer, wood particle board comprising wood as the main or only constituent of a layer, which is next to another layer of the same or of a different material
- B32B21/042—Layered products comprising a layer of wood, e.g. wood board, veneer, wood particle board comprising wood as the main or only constituent of a layer, which is next to another layer of the same or of a different material of wood
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B21/00—Layered products comprising a layer of wood, e.g. wood board, veneer, wood particle board
- B32B21/04—Layered products comprising a layer of wood, e.g. wood board, veneer, wood particle board comprising wood as the main or only constituent of a layer, which is next to another layer of the same or of a different material
- B32B21/08—Layered products comprising a layer of wood, e.g. wood board, veneer, wood particle board comprising wood as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B21/00—Layered products comprising a layer of wood, e.g. wood board, veneer, wood particle board
- B32B21/14—Layered products comprising a layer of wood, e.g. wood board, veneer, wood particle board comprising wood board or veneer
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/18—Layered products comprising a layer of synthetic resin characterised by the use of special additives
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/18—Layered products comprising a layer of synthetic resin characterised by the use of special additives
- B32B27/22—Layered products comprising a layer of synthetic resin characterised by the use of special additives using plasticisers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/30—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers
- B32B27/304—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers comprising vinyl halide (co)polymers, e.g. PVC, PVDC, PVF, PVDF
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L27/00—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Compositions of derivatives of such polymers
- C08L27/02—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Compositions of derivatives of such polymers not modified by chemical after-treatment
- C08L27/04—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Compositions of derivatives of such polymers not modified by chemical after-treatment containing chlorine atoms
- C08L27/06—Homopolymers or copolymers of vinyl chloride
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/30—Properties of the layers or laminate having particular thermal properties
- B32B2307/306—Resistant to heat
- B32B2307/3065—Flame resistant or retardant, fire resistant or retardant
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/70—Other properties
- B32B2307/732—Dimensional properties
- B32B2307/734—Dimensional stability
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- 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
- C08K3/24—Acids; Salts thereof
- C08K3/26—Carbonates; Bicarbonates
- C08K2003/265—Calcium, strontium or barium carbonate
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2201/00—Properties
- C08L2201/02—Flame or fire retardant/resistant
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- 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
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- Engineering & Computer Science (AREA)
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- Wood Science & Technology (AREA)
- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Materials Engineering (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Abstract
The invention provides a composition for preparing a wood-plastic composite decorative line base material, a wood-plastic composite decorative line base material prepared from the composition, a preparation method of the wood-plastic composite decorative line base material, and a wood-plastic composite decorative line comprising the base material. The composition comprises the following components in parts by weight: 25-55 parts of plastic matrix, 30-50 parts of wood powder and 12-18 parts of calcium carbonate powder, wherein the plastic matrix is selected from one or more of polyvinyl chloride, polyethylene and polypropylene. According to the invention, the composition comprising the plastic matrix, the wood powder and the calcium carbonate powder is used, so that the crosslinking of the plastic material and the plant-based material is improved, the moisture absorption of the composite material is reduced, the stability of the formed wood-plastic composite decorative line is improved, and the wood-plastic composite decorative line is not easy to bend and warp.
Description
Technical Field
The invention relates to the field of composite materials, in particular to a modified wood-plastic composite decorative line and a preparation method thereof.
Background
The existing solid wood composite decorative line generally comprises a multilayer plywood, a medium density fiberboard and a veneer, and the line has the following defects: the solid wood composite decorative line base layer is mostly a density board or a multilayer board or all solid wood, and is influenced by the environmental humidity in use, the moisture content is greatly changed, so that the bending and buckling deformation of the solid wood composite decorative line are easily caused, and the production and the use are influenced. Meanwhile, the solid wood composite decorative line is relatively complex in process, low in production efficiency and high in manufacturing cost.
Disclosure of Invention
The invention aims to provide a wood-plastic composite decorative line which is obtained by mixing and extruding a plastic matrix, wood powder and calcium carbonate powder according to a specific proportion and has the advantages of long service life, no influence of environmental humidity and environmental protection.
According to one aspect of the invention, the composition for preparing the wood-plastic composite decorative line base material comprises the following components in parts by weight: 25-55 parts of plastic matrix, 30-50 parts of wood powder and 12-18 parts of calcium carbonate powder.
Preferably, the plastic matrix may be one or more of polyvinyl chloride (PVC), Polyethylene (PE), polypropylene (PP). The number average molecular weight of the plastic matrix is 5-11 ten thousand, the softening temperature is 77-90 ℃, and the plastic matrix mainly plays a role in bonding and shaping.
Preferably, the wood flour is selected from broadleaf wood flour, needle wood flour, miscellaneous wood flour, pine wood flour, rice bran flour, straw, and peanut shells.
Preferably, the composition further comprises the following auxiliary agents in parts by weight: 0.8 to 1.2 parts of lubricant, 1.1 to 4.5 parts of plasticizer, 1.5 to 3 parts of titanate coupling agent, 1.8 to 2.5 parts of heat stabilizer, 0.2 to 0.6 part of age inhibitor, 1 to 2 parts of chlorinated polyethylene and 2 to 5 parts of acrylate impact modifier.
The lubricant can be stearic acid, zinc stearate, calcium stearate, lead stearate, polyester wax, ethylene bis fatty acid amide, polyethylene wax, paraffin wax, oxidized polyethylene wax, etc.
The plasticizer can be one or two selected from phthalate and chlorinated polyethylene. Preferably, the plasticizer may be 0.1 to 2.5 parts of phthalate and 1 to 2 parts of chlorinated polyethylene. Wherein the number average molecular weight of the Chlorinated Polyethylene (CPE) is 5-25 ten thousand, the chlorine content is 25-45%, and the density is 0.93-0.96 g/cm3The plasticizer is a plasticizer of the wood-plastic composite material, and has excellent weather resistance, aging resistance and flame retardant property.
The above anti-aging agent may be a benzotriazole-based ultraviolet absorber (e.g., UV-P) or a benzophenone-based ultraviolet absorber (UV-531).
The above impact modifier may be, for example, methyl acrylate-Acrylate Copolymer (ACR), Chlorinated Polyethylene (CPE), methyl methacrylate-butadiene-styrene copolymer (MBS), acrylonitrile-butadiene-styrene copolymer (ABS), ethylene-vinyl acetate copolymer (EVA), etc.
The heat stabilizer can be one or more of zinc stearate and calcium stearate.
The above composition may further comprise other additives such as foaming agents, toughening agents and processing aids, as desired. The foaming agent may be, for example, zinc oxide, stearates, carbonates, phosphates, and the like. The toughening agent may be SEBS (polystyrene-polyethylene-polybutylene-polystyrene). The processing aid may be Struktol 60NSF, a light colored aliphatic hydrocarbon resin mixture or a Struktol WB16 calcium soap and saturated fatty acid amide mixture.
According to another aspect of the invention, a wood-plastic composite decorative molding base material is provided, which is formed by extrusion of the composition.
According to another aspect of the invention, a wood-plastic composite decorative line is provided, which comprises the wood-plastic composite decorative line base material and a wood skin coated and attached on the wood-plastic composite decorative line base material.
According to another aspect of the invention, a preparation method of the wood-plastic composite decorative line base material is provided, which comprises the following steps:
step 1, controlling the water content of 25-55 parts by weight of plastic matrix, 30-50 parts by weight of wood powder and 12-18 parts by weight of calcium carbonate powder within 1%, and mixing at 90-100 ℃ to obtain a mixed material;
and step 6, molding and extruding the mixed material to obtain the wood-plastic composite decorative line base material.
Preferably, the preparation method further comprises the following steps between step 1 and step 6 in sequence:
step 2, adding 1.5-3 parts by weight of titanate coupling agent into the mixed material prepared in the step 1, and mixing at the temperature of 113-118 ℃;
step 3, adding 1.8-2.5 parts by weight of heat stabilizer into the mixed material prepared in the step 2, and mixing at 75-85 ℃;
step 4, adding 0.8 to 1.2 weight parts of lubricant, 1.1 to 4.5 weight parts of plasticizer, 0.2 to 0.6 weight part of anti-aging agent and 2 to 5 weight parts of impact modifier into the mixed material prepared in the step 3, and mixing at the temperature of 95 to 100 ℃;
and 5, discharging powder from the mixed material prepared in the step 4 at the temperature of 122-125 ℃, and cooling to 40-45 ℃ for granulation or melt plasticization.
The novel composite material is prepared by mixing the specific plastic matrix, the wood powder and the auxiliary agent, improves the crosslinking of the plastic matrix and the plant-based material, seals the hydrophilic hydroxyl of the wood material to the maximum extent, reduces the hygroscopicity, and improves the stability of the wood-plastic composite decorative line, so that the wood-plastic composite decorative line is not bent or warped.
Compared with the prior art, the invention has the following beneficial effects:
1. product standardization: the wood-plastic production completely depends on professional equipment and a die, the produced product can fundamentally meet the fine requirements of the product on size, appearance and the like, the efficient production can be realized, and the problems of product size deviation and the like caused by the traditional process are solved.
2. The cost is saved: (1) the plastic-wood section has the lowest loss, and the wood plastic is the section, so that the material with the specified length can be produced according to the actual requirement. The wood is difficult to produce in full size; (2) the wood plastic is a section, the hollow specification is more, the material is saved, the hollow can reduce the weight and increase the strength, and the wood cannot be hollow; (3) the service life of the wood plastic can generally reach 3-4 times of that of common wood; (4) and the waste excess materials in the wood-plastic production can be recycled by hundreds.
3. And (3) environmental protection: the research focus is mainly focused on the aspect of composite materials which are prepared by using thermoplastic plastics such as Polyethylene (PE), polypropylene (PP), polyvinyl chloride (PVC), Polystyrene (PS) and the like and wood powder such as wood powder, plant straw powder, plant seed shells and the like as raw materials through extrusion, injection molding and compression molding. From the production raw materials, the raw materials of the wood-plastic composite material can adopt various waste plastics, waste wood and residues of crops as raw materials. Therefore, the development and the wide application of the wood-plastic composite material are beneficial to slowing down the pollution of plastic wastes and reducing the pollution of the environment caused by burning agricultural wastes. The production and use of the wood-plastic composite material can not emit volatile matters harmful to human health to the surrounding environment, and the material can be recycled, so that the wood-plastic composite material is a brand new green environment-friendly product and is also an ecological clean composite material.
4. Safety: the product does not contain benzene substances, the formaldehyde content is lower than 0.2 and lower than the E0 grade standard, the product is the European grade-defining environmental protection standard, the product can be recycled, the wood use amount is greatly saved, the product is suitable for the national policy of sustainable development, and the product has high fire resistance, can effectively resist flame, has the fire rating reaching B1 grade, is self-extinguished when meeting fire, and does not generate any toxic gas.
Detailed Description
Example 1
The composition for preparing the wood-plastic composite decorative line base material comprises the following raw materials in parts by weight: 25 parts of polyvinyl chloride raw material, 30 parts of wood powder, 12 parts of calcium carbonate powder, 0.8 part of lubricant stearic acid, 0.1 part of plasticizer phthalate, 1.5 parts of titanate coupling agent isopropyl dioleate acyloxy titanate, 1.8 parts of heat stabilizer calcium stearate, 0.2 part of anti-aging agent benzotriazole ultraviolet absorbent UV-P, 1 part of chlorinated polyethylene and 2 parts of acrylate impact modifier (ACR).
The wood flour is broadleaf wood flour.
The preparation method of the modified wood-plastic composite decorative line comprises the following steps:
(1) controlling the water content of the filler calcium carbonate powder and the polyvinyl chloride-wood powder mixed material within 1%, placing the materials in a mixing pot, starting mixing the materials at the temperature of 90 ℃ for 25min, and stopping the mixing pot; adding titanate coupling agent according to the raw material ratio, mixing at 113 ℃, and stopping mixing after lasting for 3 min; adding a PVC heat stabilizer at the temperature of 80 ℃; adding lubricant and other auxiliary agent components, and mixing at 100 deg.C; then adding a processing aid Struktol 60NSF accounting for 4% of the mass of PVC and a foaming agent zinc oxide accounting for 2% of the mass of PVC, discharging powder at 120 ℃, and granulating or adding into a double screw for melting and plasticizing after cooling the powder to 40 ℃ in a cold mixing barrel.
(2) Extruding through a die of a machine head, wherein the extrusion conditions are as follows: the temperature of the material barrel (185-180 ℃ in the first section, 175-170 ℃ in the second section, 165-160 ℃ in the third section and 165-160 ℃ in the fourth section), the temperature of the transition section is 165 ℃, the temperature of the machine head is 170-165 ℃, the temperature of the die (175-165 ℃ in the first section, 165-160 ℃ in the second section and 160-155 ℃ in the third section) and the rotation speed of the screw is 15-20 r/min.
(3) And (3) shaping and cooling the extruded product through a shaping table, and after cooling, drawing and conveying the product to an operation table by a tractor for saw cutting to form the wood-plastic composite base material.
(4) And coating natural wood skin on the surface of the wood-plastic composite base material and then performing surface coating.
Example 2
The composition for preparing the wood-plastic composite decorative line base material comprises the following raw materials in parts by weight: 55 parts of polyvinyl chloride raw material, 50 parts of wood powder, 18 parts of calcium carbonate powder, 1.2 parts of lubricant polyethylene wax, 2.5 parts of plasticizer phthalate, 3 parts of titanate coupling agent isopropyl dioleate acyloxy titanate, 2.5 parts of heat stabilizer zinc stearate, 2 parts of anti-aging agent benzophenone ultraviolet absorbent UV-5310.6 parts, 2 parts of chlorinated polyethylene and 5 parts of acrylate impact modifier (ACR).
The wood powder is pine wood powder.
The preparation method of the modified wood-plastic composite decorative line comprises the following steps:
(1) controlling the water content of the filler calcium carbonate powder and the polyvinyl chloride-wood powder mixed material within 1%, placing the materials in a mixing pot, starting mixing the materials at the temperature of 97 ℃, and stopping the mixing pot after the materials last for 33 min; adding titanate coupling agent according to the raw material ratio, mixing at the temperature of 118 ℃, and stopping mixing after lasting for 7 min; adding a PVC heat stabilizer at the temperature of 75 ℃; adding a lubricant and other auxiliary agent components, and mixing at the temperature of 95 ℃; then adding a processing aid Struktol 60NSF accounting for 4% of the mass of PVC and a foaming agent sodium bicarbonate accounting for 2% of the mass of PVC, discharging powder at the temperature of 125 ℃, and granulating or adding the powder into a double screw for melting and plasticizing after cooling the powder to 42 ℃ in a cold mixing barrel.
(2) Extruding through a head die, wherein the extrusion conditions are as follows: the temperature of the material barrel (185-180 ℃ in the first section, 175-170 ℃ in the second section, 165-160 ℃ in the third section and 165-160 ℃ in the fourth section), the temperature of the transition section is 165 ℃, the temperature of the machine head is 170-165 ℃, the temperature of the die (175-165 ℃ in the first section, 165-160 ℃ in the second section and 160-155 ℃ in the third section) and the rotation speed of the screw is 15-20 r/min.
(3) And (3) shaping and cooling the extruded product through a shaping table, and after cooling, drawing and conveying the product to an operation table by a tractor for saw cutting to form the wood-plastic composite base material.
(4) And coating natural wood skin on the surface of the wood-plastic composite base material and then performing surface coating.
Example 3
The composition for preparing the wood-plastic composite decorative line base material comprises the following raw materials in parts by weight: 30 parts of polyvinyl chloride raw material, 37 parts of wood powder, 14 parts of calcium carbonate powder, 1.0 part of lubricant paraffin, 0.18 part of plasticizer phthalate, 1.8 parts of titanate coupling agent isopropyl dioleate acyloxy titanate, 2.2 parts of heat stabilizer calcium stearate, 0.3 part of anti-aging agent benzotriazole ultraviolet absorbent UV-P, 1.6 parts of chlorinated polyethylene and 3.5 parts of acrylate impact modifier (ACR).
The wood flour is miscellaneous wood flour.
The preparation method of the modified wood-plastic composite decorative line comprises the following steps:
(1) controlling the water content of the filler calcium carbonate powder and the polyvinyl chloride-wood powder mixed material within 1%, placing the materials in a mixing pot, starting mixing the materials at the temperature of 95 ℃, and stopping the mixing pot after the materials last for 32 min; adding titanate coupling agent according to the raw material ratio, mixing at the temperature of 115 ℃, and stopping mixing after lasting for 5 min; adding a PVC heat stabilizer at the temperature of 78 ℃; adding a lubricant and other auxiliary agent components, and mixing at the temperature of 92 ℃; then adding a processing aid Struktol 60NSF accounting for 4% of the mass of PVC and a foaming agent zinc oxide accounting for 2% of the mass of PVC, discharging powder at 125 ℃, cooling the powder to 40 ℃ in a cold mixing barrel, and granulating or adding the powder into a double screw for melting and plasticizing.
(2) Extruding through a head die, wherein the extrusion conditions are as follows: the temperature of the material barrel (185-180 ℃ in the first section, 175-170 ℃ in the second section, 165-160 ℃ in the third section and 165-160 ℃ in the fourth section), the temperature of the transition section is 165 ℃, the temperature of the machine head is 170-165 ℃, the temperature of the die (175-165 ℃ in the first section, 165-160 ℃ in the second section and 160-155 ℃ in the third section) and the rotation speed of the screw is 15-20 r/min.
(3) And (3) shaping and cooling the extruded product through a shaping table, and after cooling, drawing and conveying the product to an operation table by a tractor for saw cutting to form the wood-plastic composite base material.
(4) And coating natural wood skin on the surface of the wood-plastic composite base material and then performing surface coating.
Performance testing
The modified wood-plastic composite decorative lines prepared according to examples 1 to 3 were measured for formaldehyde content, stability and bending and warping properties, and the test procedure was as follows.
The formaldehyde release amount test refers to GB18580-2017 Formaldehyde release limit in artificial boards and products thereof for interior decoration and finishing materials, the stability test refers to GB/T19367-2009 dimension determination for artificial boards, and the bending and warping performance test refers to GB/T24137-2009 Wood-Plastic decorative boards and LY/T2714-2016-Wood-Plastic door pocket line.
The results obtained by the measurement are as follows.
Compared with the existing solid wood composite decorative line, the base material of the wood-plastic composite decorative line according to embodiments 1 to 3 is made of a novel composite material by mixing polyvinyl chloride, wood powder and a modification auxiliary agent, and is manufactured by a one-time continuous extrusion forming process, so that the crosslinking of a plastic matrix and a plant-based material is improved, hydrophilic hydroxyl groups of the wood material are sealed to the greatest extent, the moisture absorption is reduced, the static bending strength and the elastic modulus of the wood-plastic composite decorative line base material are improved, the stability of the wood-plastic composite decorative line is improved, the size of the wood-plastic composite decorative line is stable, and bending and warping deformation are avoided.
Other embodiments of the invention will be apparent to those skilled in the art from consideration of the specification and practice of the invention disclosed herein. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the invention being indicated by the following claims.
Claims (9)
1. The composition for preparing the wood-plastic composite decorative line base material is characterized by comprising the following components in parts by weight: 25-55 parts of plastic matrix, 30-50 parts of wood powder and 12-18 parts of calcium carbonate powder; the plastic matrix is selected from one or more of polyvinyl chloride, polyethylene and polypropylene.
2. The composition for preparing a wood-plastic composite decorative molding substrate according to claim 1, the wood flour being selected from one or more of broadleaf wood flour, coniferous wood flour, miscellaneous wood flour, pine wood flour, rice bran flour, straw and peanut shell.
3. The composition for preparing a wood-plastic composite decorative molding substrate according to claim 1, further comprising the following additives in parts by weight: 0.8 to 1.2 portions of lubricant, 1.1 to 4.5 portions of plasticizer, 0.2 to 0.6 portion of age inhibitor and 2 to 5 portions of impact modifier.
4. The composition for preparing a wood-plastic composite decorative line substrate according to claim 3, wherein the auxiliary agent further comprises 1.5-3 parts by weight of titanate coupling agent and 1.8-2.5 parts by weight of heat stabilizer.
5. A wood-plastic composite molding substrate extruded from the composition of any one of claims 1 to 4.
6. A wood-plastic composite molding comprising the wood-plastic composite molding base material of claim 5 and a veneer coated on the wood-plastic composite molding base material.
7. A preparation method of a wood-plastic composite decorative line base material comprises the following steps:
step 1, controlling the water content of 25-55 parts by weight of plastic matrix, 30-50 parts by weight of wood powder and 12-18 parts by weight of calcium carbonate powder within 1%, and mixing at 90-100 ℃ to obtain a mixed material;
step 6, molding and extruding the mixed material to obtain the wood-plastic composite decorative line base material;
wherein the plastic matrix is selected from one or more of polyvinyl chloride, polyethylene and polypropylene.
8. The method for preparing the wood-plastic composite decorative line base material according to claim 7, further comprising the following steps between the step 1 and the step 6 in sequence:
step 2, adding 1.5-3 parts by weight of titanate coupling agent into the mixed material prepared in the step 1, and mixing at the temperature of 113-118 ℃;
step 3, adding 1.8-2.5 parts by weight of heat stabilizer into the mixed material prepared in the step 2, and mixing at 75-85 ℃;
step 4, adding 0.8 to 1.2 weight parts of lubricant, 1.1 to 4.5 weight parts of plasticizer, 0.2 to 0.6 weight part of anti-aging agent and 2 to 5 weight parts of impact modifier into the mixed material prepared in the step 3, and mixing at the temperature of 95 to 100 ℃;
and 5, discharging powder from the mixed material prepared in the step 4 at the temperature of 122-125 ℃, and cooling to 40-45 ℃ for granulation or melt plasticization.
9. The method for preparing a wood-plastic composite decorative molding substrate according to claim 7, wherein the wood flour is selected from one or more of broadleaf wood flour, needle leaf wood flour, miscellaneous wood flour, pine wood flour, rice bran flour, straw and peanut shell.
Priority Applications (1)
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