CN102408736A - Flame retardant high-wood content wood-plastic composite material and preparation method thereof - Google Patents
Flame retardant high-wood content wood-plastic composite material and preparation method thereof Download PDFInfo
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Abstract
A flame retardant high-wood content wood-plastic composite material and a preparation method thereof relate to a wood-plastic composite material and a preparation method thereof, wherein the problem of easy burning of the wood-plastic composite material with high wood content and the problems of high fire retardant addition amount, low anti-flaming efficiency and high cost of the existing flame retardant treatment technology are solved. The material is prepared from a fire retardant for wood fibers, a wood fiber material, thermoplastic plastics, a fire retardant for plastics, a coupling agent, a lubricant, an antioxidant, a smoke eliminating agent and auxiliaries. The method comprises the following steps of: weighing raw materials; preparing a flame retardant processing fluid; preparing a flame retardant wood fiber material; performing melting granulation on the thermoplastic plastics and the fire retardant for plastics to obtain flame retardant thermoplastic plastic base particles; mixing the flame wood fiber material with the flame retardant thermoplastic plastic base particles, the coupling agent, the lubricant, the antioxidant, the smoke eliminating agent and the auxiliaries, thereby obtaining a premix; performing melting compounding on the premix to obtain a melt material; and molding the melt material to obtain the flame retardant high-wood content wood-plastic composite material. The dosage of the fire retardant in the flame retardant high-wood content wood-plastic composite material is low; and the flame retardant high-wood content wood-plastic composite material is high in flame retardant efficiency and low in cost.
Description
Technical field
The present invention relates to wood plastic composite and preparation method thereof.
Background technology
Wood plastic composite be one type with timber or other lignocellulosic material as filling or strongthener, be matrix with the thermoplastic polymer, through a kind of advanced composite material that melt extrudes or technology such as injection molding is processed.Compare with traditional wood materials; Advantages such as that wood plastic composite has is water-fast, corrosion-resistant, ageing-resistant, anti-ly damage by worms, dimensional stability is good; Simultaneously can carry out secondary processing and recycling, help alleviating the timber resources pressure, solve the plastic pollution problem.At present, being applied to automobile inside plaque, construction and decoration, freight pallet, open-air tables and chairs, wrapping material, sleeper, furniture and war industry, is a kind of green material that has development prospect.
Along with the rapid expansion with industry size that improves constantly of wood plastic composite production technology, its application in fields such as upholstery, door and window, floor, furniture, automotive trims constantly increases.In order to improve surperficial woodiness touch and to reduce production costs, the wood plastic composite of actual production is pursued higher wood fibre addition as far as possible, reduces the consumption of plastics.Yet; As the matrix material of mainly being made up of lignocellulosic material and two kinds of combustible matls of plastics, wood plastic composite has the characteristics more inflammable and higher than combustion of wood calorific value than plastics, and fire hazard is very big; Fire hazard can not be ignored, and fire-retardant finish is extremely important.
At present, be employed in the mode of adding various fire retardants in the wood plastic composite more and improve its flame retardant properties.Though halogen containing flame-retardant can be obtained the good flame effect; But can produce corrodibility and toxic products such as hydrogen halide during this fire retardant material burning; Improved fire hazard greatly; Can not satisfy environmental requirement, therefore, adopt Halogen, nontoxic, non-corrosive fire retardant prepares flame-retardant wood-plastic composite becomes inexorable trend.Name is called in the patent of " flame-retardant wood-plastic composite and preparation method thereof (Chinese patent number: ZL200910072237.X; the applying date: on June 10th, 2009) " and discloses a kind of flame-retardant wood-plastic composite and preparation method thereof, and the fire retardant that is adopted is to be the main body, be that auxiliary char-forming agent,
molecular sieve are that synergist, zinc borate are for pressing down the expansion type flame-retarding system of fumicants formation with starch with melamine pyrophosphate salt or polyphosphoric acid melamine salt; Name is called in the patent of " flame-proof smoke-inhibiting wood-plastic composite material (Chinese patent number: ZL200710072794.2; the applying date: on September 12nd, 2007) " and discloses a kind of flame-proof smoke-inhibiting wood-plastic composite material; The expansion type flame retardant that is adopted is that 20: 1～8 ammonium polyphosphate and starch are formed by weight ratio, and the plastics that adopted are PS and/or the SE that has added thermo-stabilizer; Name is called in the patent of " flame-resistant plastic-wood composite materials and preparation method thereof (Chinese patent number: ZL200610039985.4; the applying date: on April 28th, 2006) " and discloses a kind of flame-resistant plastic-wood composite materials and preparation method thereof; The expansion type flame retardant that employing is made up of main body ammonium polyphosphate flame retardant, whipping agent and char-forming agent prepares flame-retardant wood-plastic composite material; These methods can obtain flame retardant properties preferably; But need the ammonium polyphosphate amount of adding bigger, this has not only increased the matrix material cost but also its mechanical property has been had disadvantageous effect.In addition; Name is called and adopts the plastic matrix that contains the boron silicone grafted polymers and vegetable fibre powder and other auxiliary agent blend to prepare organic silicon-boron flame-retardant wood-plastic composite material in the patent of " organic silicon-boron flame-retardant wood-plastic composite material and preparation method thereof (application number: 201010148882.8; applying date: on April 16th, 2010) "; Though keep mechanical property preferably, the material flame retardant effect is not good enough; Name is called in the patent of " a kind of flame-retardant wood-plastic composite material and preparation method thereof (application number: 201010288686.0; applying date: on September 21st, 2010) " and adopts alkali lye, alcoholic solution and trimeric cyanamide saturated hot-water solution-treated to obtain modified wood powder; Carry out the compound preparation flame-retardant wood-plastic composite material of fusion with hydrated metal oxide, polymeric matrix, treatment process is comparatively complicated.
On the whole; Prior art is primarily aimed at polymeric matrix, realizes the fire-retardant finish to matrix material through the mode that adds acid source and char-forming agent formation expansion type flame-retarding system, needs to add a large amount of fire retardants and obtain flame retardant effect preferably; This causes cost to increase, and flame retarding efficiency is not high.
Summary of the invention
The present invention seeks to be easy to burn and there is the problem that the fire retardant addition is big, flame retarding efficiency is not high, cost is bigger than normal in existing fire-retardant finish technology, and high wooden content wood plastic composite of a kind of flame retardant type and preparation method thereof is provided for the wood plastic composite that solves high wooden content.
The high wooden content wood plastic composite of flame retardant type by ratio of weight and the number of copies by 5～25 parts wood fibre with fire retardant, 50～70 parts lignocellulosic material, 30～50 parts thermoplastics, 5～25 parts plastics with fire retardant, 2～8 parts coupling agent, 1～3 part lubricant, 0.1～3 part oxidation inhibitor, 1～5 part but the auxiliary agent of fumicants and 0～5 part process; Wherein wood fibre uses fire retardant to be phosphoric acid guanylurea, fire retardant FR W, methylolation phosphoric acid guanylurea, ammonium polyphosphate, ammonium pyrophosphate, ammonium hydrogen phosphate, primary ammonium phosphate, ammonium sulfate, trimeric cyanamide or melamine pyrophosphate; Lignocellulosic material is one or more the mixture in wood powder, powdered rice hulls, bamboo bits, straw powder, shell powder, bagasse, the flaxen fiber; Thermoplastics is one or more the mixture in Vilaterm, Vestolen PP 7052, Vilaterm reclaimed materials or the Vestolen PP 7052 reclaimed materials; Plastics use fire retardant to be high-polymerization degree ammonium polyphosphate, red phosphorus, expansible black lead, melamine cyanurate or SULPHOSUCCINIC ACID ESTER; Coupling agent is one or more the mixture in the Vestolen PP 7052 of Vilaterm, modified by maleic acid anhydride graft of titanic acid ester, aluminic acid ester, isocyanic ester, silane coupling agent, modified by maleic acid anhydride graft; Lubricant is one or more the mixture in paraffin, polyethylene wax, Poly Propylene Wax, OPE, Triple Pressed Stearic Acid, the Metallic stearates; Oxidation inhibitor is oxidation inhibitor 168, antioxidant 1010, antioxidant 264, antioxidant 1076, antioxidant 2246, oxidation inhibitor 1035, antioxidant 3114, oxidation inhibitor 1790,2; The mixture of one or more in 6-di-tert-butyl-4-methy phenol, tricresyl phosphite (2, the 4-di-tert-butyl-phenyl) ester; Pressing down fumicants is zinc borate, Marinco H, white lake, molybdic oxide, ammonium octamolybdate, Cu
2The mixture of one or more among the O; Auxiliary agent is Paris white, talcum powder, flyash, carbon black or Calucium Silicate powder.
The preparation method of the high wooden content wood plastic composite of flame retardant type carries out according to the following steps: one, take by weighing by ratio of weight and the number of copies 5～25 parts wood fibre with fire retardant, 50～70 parts lignocellulosic material, 30～50 parts thermoplastics, 5～25 parts plastics with fire retardant, 2～8 parts coupling agent, 1～3 part lubricant, 0.1～3 part oxidation inhibitor, 1～5 part but the auxiliary agent of fumicants and 0～5 part; Two, the wood fibre that takes by weighing is hybridly prepared into fire-retardant treatment liquid with fire retardant and water; Three, the lignocellulosic material that takes by weighing is put in the high-speed mixer, and on lignocellulosic material, sprayed fire-retardant treatment liquid, get material, the water ratio that under 105 ℃, is dried in the material then is 0.5%～3%, obtains fire-retardant lignocellulosic material; Four, using fire retardant to place temperature in the thermoplastics that takes by weighing and plastics is that 140～180 ℃, screw speed are that the twin screw extruder of 50～100r/min carries out melt pelletization, obtains flame-proofed thermoplastic plastic substrate particle; Five, with fire-retardant lignocellulosic material, flame-proofed thermoplastic plastic substrate particle, coupling agent, lubricant, oxidation inhibitor, press down fumicants and auxiliary agent is put in the high-speed mixer, be to mix 5～20min under 70～120 ℃ the condition in temperature, obtain Preblend; Six, it is compound to place temperature to be that 135～170 ℃, screw speed are that the twin screw extruder of 30～50r/min carries out fusion Preblend, obtains melt material; Seven, melt material is through extruding, promptly obtaining the high wooden content wood plastic composite of flame retardant type after injection moulding, hot pressing or the compression molding; Wherein wood fibre uses fire retardant to be phosphoric acid guanylurea, fire retardant FR W, methylolation phosphoric acid guanylurea, ammonium polyphosphate, ammonium pyrophosphate, ammonium hydrogen phosphate, primary ammonium phosphate, ammonium sulfate, trimeric cyanamide or melamine pyrophosphate in the step 1; Lignocellulosic material is one or more the mixture in wood powder, powdered rice hulls, bamboo bits, straw powder, shell powder, bagasse, the flaxen fiber; Thermoplastics is one or more the mixture in Vilaterm, Vestolen PP 7052, Vilaterm reclaimed materials or the Vestolen PP 7052 reclaimed materials; Plastics use fire retardant to be high-polymerization degree ammonium polyphosphate, red phosphorus, expansible black lead, melamine cyanurate or SULPHOSUCCINIC ACID ESTER; Coupling agent is one or more the mixture in the Vestolen PP 7052 of Vilaterm, modified by maleic acid anhydride graft of titanic acid ester, aluminic acid ester, isocyanic ester, silane coupling agent, modified by maleic acid anhydride graft; Lubricant is one or more the mixture in paraffin, polyethylene wax, Poly Propylene Wax, OPE, Triple Pressed Stearic Acid, the Metallic stearates; Oxidation inhibitor is oxidation inhibitor 168, antioxidant 1010, antioxidant 264, antioxidant 1076, antioxidant 2246, oxidation inhibitor 1035, antioxidant 3114, oxidation inhibitor 1790,2; The mixture of one or more in 6-di-tert-butyl-4-methy phenol, tricresyl phosphite (2, the 4-di-tert-butyl-phenyl) ester; Pressing down fumicants is zinc borate, Marinco H, white lake, molybdic oxide, ammonium octamolybdate, Cu
2The mixture of one or more among the O; Auxiliary agent is Paris white, talcum powder, flyash, carbon black or Calucium Silicate powder; Wood fibre with fire retardant and water is according to ratio of weight and number 5～25 in the step 2: 125～175 mix.
The present invention adopts polyolefin plastics to prepare wood plastic composite as matrix; Make full use of its wide material sources, be easy to advantages such as forming process; Carry out fire-retardant to lignocellulosic material and thermoplastics respectively through adding different fire retardants to obtain cooperative flame retardant effect preferably; Make full use of the one-tenth charcoal effect of lignocellulosic material itself, reduce the fire retardant consumption, give the wood plastic composite good flame retardancy; Make that the Application Areas of wood plastic composite obtains expanding, can be widely used in indoor and the flame retardant properties public place that has certain requirements.
Because lignocellulosic material mainly is made up of Mierocrystalline cellulose, semicellulose and xylogen; Therefore itself be the many carbon superpolymer that contains a large amount of alcoholic extract hydroxyl groups and phenolic hydroxyl group, have good carbon-forming performance, for the wood plastic composite of the wooden content of height; Can utilize wood fibre to become charcoal, cooperate plastics to constitute the expansion type flame-retarding system to realize fire-retardant to wood plastic composite with fire retardant with fire retardant catalysis wood fibre; Not only do not need extra interpolation char-forming agent, and the fire retardant consumption is few, flame retarding efficiency is high; Technology is simple, and cost is low.
The high wooden content wood plastic composite of the flame retardant type of the present invention's preparation not only has fire-retardant preferably and smoke suppressing; And kept its original imitative wood effect and mechanical property preferably, can be widely used in fields such as building decoration, furniture manufacturing, interior decoration, automotive trim and door-window section bar.
Embodiment
Embodiment one: the high wooden content wood plastic composite of this embodiment flame retardant type by ratio of weight and the number of copies by 5～25 parts wood fibre with fire retardant, 50～70 parts lignocellulosic material, 30～50 parts thermoplastics, 5～25 parts plastics with fire retardant, 2～8 parts coupling agent, 1～3 part lubricant, 0.1～3 part oxidation inhibitor, 1～5 part but the auxiliary agent of fumicants and 0～5 part process; Wherein wood fibre uses fire retardant to be phosphoric acid guanylurea, fire retardant FR W, methylolation phosphoric acid guanylurea, ammonium polyphosphate, ammonium pyrophosphate, ammonium hydrogen phosphate, primary ammonium phosphate, ammonium sulfate, trimeric cyanamide or melamine pyrophosphate; Lignocellulosic material is one or more the mixture in wood powder, powdered rice hulls, bamboo bits, straw powder, shell powder, bagasse, the flaxen fiber; Thermoplastics is one or more the mixture in Vilaterm, Vestolen PP 7052, Vilaterm reclaimed materials or the Vestolen PP 7052 reclaimed materials; Plastics use fire retardant to be high-polymerization degree ammonium polyphosphate, red phosphorus, expansible black lead, melamine cyanurate or SULPHOSUCCINIC ACID ESTER; Coupling agent is one or more the mixture in the Vestolen PP 7052 of Vilaterm, modified by maleic acid anhydride graft of titanic acid ester, aluminic acid ester, isocyanic ester, silane coupling agent, modified by maleic acid anhydride graft; Lubricant is one or more the mixture in paraffin, polyethylene wax, Poly Propylene Wax, OPE, Triple Pressed Stearic Acid, the Metallic stearates; Oxidation inhibitor is oxidation inhibitor 168, antioxidant 1010, antioxidant 264, antioxidant 1076, antioxidant 2246, oxidation inhibitor 1035, antioxidant 3114, oxidation inhibitor 1790,2; The mixture of one or more in 6-di-tert-butyl-4-methy phenol, tricresyl phosphite (2, the 4-di-tert-butyl-phenyl) ester; Pressing down fumicants is zinc borate, Marinco H, white lake, molybdic oxide, ammonium octamolybdate, Cu
2The mixture of one or more among the O; Auxiliary agent is Paris white, talcum powder, flyash, carbon black or Calucium Silicate powder.
Press when lignocellulosic material is formed for two or more material in this embodiment arbitrarily than mixing; When forming for two or more material, presses thermoplastics arbitrarily than mixing; When using fire retardant to form for two or more material, press in plastics arbitrarily than mixing; When forming for two or more material, presses by coupling agent arbitrarily than mixing; When forming for two or more material, presses lubricant arbitrarily than mixing; When forming for two or more material, presses by oxidation inhibitor arbitrarily than mixing; Press down when fumicants is formed for two or more material and press arbitrarily than mixing.
Embodiment two: this embodiment and embodiment one are different be the high wooden content wood plastic composite of flame retardant type by ratio of weight and the number of copies by 5 parts wood fibre with fire retardant, 50 parts lignocellulosic material, 50 parts thermoplastics, 5 parts plastics with fire retardant, 2 parts coupling agent, 1 part lubricant, 0.1 part oxidation inhibitor and 1 part but fumicants process.Other is identical with embodiment one.
Embodiment three: this embodiment and embodiment one are different be the high wooden content wood plastic composite of flame retardant type by ratio of weight and the number of copies by 25 parts wood fibre with fire retardant, 70 parts lignocellulosic material, 30 parts thermoplastics, 25 parts plastics with fire retardant, 8 parts coupling agent, 3 parts lubricant, 3 parts oxidation inhibitor, 5 parts but the auxiliary agent of fumicants and 5 parts process.Other is identical with embodiment one.
Embodiment four: this embodiment and embodiment one are different be the high wooden content wood plastic composite of flame retardant type by ratio of weight and the number of copies by 10～20 parts wood fibre with fire retardant, 55～65 parts lignocellulosic material, 35～45 parts thermoplastics, 10～20 parts plastics with fire retardant, 3～7 parts coupling agent, 1.5～2.5 parts lubricant, 0.5～2 part oxidation inhibitor, 2～4 parts but the auxiliary agent of fumicants and 1～4 part process.Other is identical with embodiment one.
Embodiment five: this embodiment and embodiment one are different be the high wooden content wood plastic composite of flame retardant type by ratio of weight and the number of copies by 15 parts wood fibre with fire retardant, 60 parts lignocellulosic material, 40 parts thermoplastics, 15 parts plastics with fire retardant, 5 parts coupling agent, 2 parts lubricant, 1 part oxidation inhibitor, 3 parts but the auxiliary agent of fumicants and 3 parts process.Other is identical with embodiment one.
Embodiment six: this embodiment is different with one of embodiment one to five is that the particle order number of lignocellulosic material is 10～300 orders.Other is identical with one of embodiment one to five.
Embodiment seven: this embodiment is different with one of embodiment one to five is that the particle order number of lignocellulosic material is 50 orders.Other is identical with one of embodiment one to five.
Embodiment eight: this embodiment is different with one of embodiment one to five is that the particle order number of lignocellulosic material is 100 orders.Other is identical with one of embodiment one to five.
Embodiment nine: this embodiment is different with one of embodiment one to five is that the particle order number of lignocellulosic material is 200 orders.Other is identical with one of embodiment one to five.
Embodiment ten: this embodiment is different with one of embodiment one to nine is that the polymerization degree of high-polymerization degree ammonium polyphosphate is greater than 1000.Other is identical with one of embodiment one to nine.
Embodiment 11: the preparation method of the high wooden content wood plastic composite of this embodiment flame retardant type carries out according to the following steps: one, take by weighing by ratio of weight and the number of copies 5～25 parts wood fibre with fire retardant, 50～70 parts lignocellulosic material, 30～50 parts thermoplastics, 5～25 parts plastics with fire retardant, 2～8 parts coupling agent, 1～3 part lubricant, 0.1～3 part oxidation inhibitor, 1～5 part but the auxiliary agent of fumicants and 0～5 part; Two, the wood fibre that takes by weighing is hybridly prepared into fire-retardant treatment liquid with fire retardant and water; Three, the lignocellulosic material that takes by weighing is put in the high-speed mixer, and on lignocellulosic material, sprayed fire-retardant treatment liquid, get material, the water ratio that under 105 ℃, is dried in the material then is 0.5%～3%, obtains fire-retardant lignocellulosic material; Four, using fire retardant to place temperature in the thermoplastics that takes by weighing and plastics is that 140～180 ℃, screw speed are that the twin screw extruder of 50～100r/min carries out melt pelletization, obtains flame-proofed thermoplastic plastic substrate particle; Five, with fire-retardant lignocellulosic material, flame-proofed thermoplastic plastic substrate particle, coupling agent, lubricant, oxidation inhibitor, press down fumicants and auxiliary agent is put in the high-speed mixer, be to mix 5～20min under 70～120 ℃ the condition in temperature, obtain Preblend; Six, it is compound to place temperature to be that 135～170 ℃, screw speed are that the twin screw extruder of 30～50r/min carries out fusion Preblend, obtains melt material; Seven, melt material is through extruding, promptly obtaining the high wooden content wood plastic composite of flame retardant type after injection moulding, hot pressing or the compression molding; Wherein wood fibre uses fire retardant to be phosphoric acid guanylurea, fire retardant FR W, methylolation phosphoric acid guanylurea, ammonium polyphosphate, ammonium pyrophosphate, ammonium hydrogen phosphate, primary ammonium phosphate, ammonium sulfate, trimeric cyanamide or melamine pyrophosphate in the step 1; Lignocellulosic material is one or more the mixture in wood powder, powdered rice hulls, bamboo bits, straw powder, shell powder, bagasse, the flaxen fiber; Thermoplastics is one or more the mixture in Vilaterm, Vestolen PP 7052, Vilaterm reclaimed materials or the Vestolen PP 7052 reclaimed materials; Plastics use fire retardant to be high-polymerization degree ammonium polyphosphate, red phosphorus, expansible black lead, melamine cyanurate or SULPHOSUCCINIC ACID ESTER; Coupling agent is one or more the mixture in the Vestolen PP 7052 of Vilaterm, modified by maleic acid anhydride graft of titanic acid ester, aluminic acid ester, isocyanic ester, silane coupling agent, modified by maleic acid anhydride graft; Lubricant is one or more the mixture in paraffin, polyethylene wax, Poly Propylene Wax, OPE, Triple Pressed Stearic Acid, the Metallic stearates; Oxidation inhibitor is oxidation inhibitor 168, antioxidant 1010, antioxidant 264, antioxidant 1076, antioxidant 2246, oxidation inhibitor 1035, antioxidant 3114, oxidation inhibitor 1790,2; The mixture of one or more in 6-di-tert-butyl-4-methy phenol, tricresyl phosphite (2, the 4-di-tert-butyl-phenyl) ester; Pressing down fumicants is zinc borate, Marinco H, white lake, molybdic oxide, ammonium octamolybdate, Cu
2The mixture of one or more among the O; Auxiliary agent is Paris white, talcum powder, flyash, carbon black or Calucium Silicate powder; Wood fibre with fire retardant and water is according to ratio of weight and number 5～25 in the step 2: 125～175 mix.
Press when lignocellulosic material is formed for two or more material in this embodiment step 1 arbitrarily than mixing; When forming for two or more material, presses thermoplastics arbitrarily than mixing; When using fire retardant to form for two or more material, press in plastics arbitrarily than mixing; When forming for two or more material, presses by coupling agent arbitrarily than mixing; When forming for two or more material, presses lubricant arbitrarily than mixing; When forming for two or more material, presses by oxidation inhibitor arbitrarily than mixing; Press down when fumicants is formed for two or more material and press arbitrarily than mixing.
Injection moulding is that melt material is injected die cavity in this embodiment step 7, behind cooling curing, obtains molding.
Embodiment 12: this embodiment and embodiment 11 are different be take by weighing by ratio of weight and the number of copies in the step 1 20 parts wood fibre with fire retardant, 55 parts lignocellulosic material, 45 parts thermoplastics, 20 parts plastics with fire retardant, 6 parts coupling agent, 2 parts lubricant, 1 part oxidation inhibitor and 2 parts press down fumicants.Other step and parameter are identical with embodiment 11.
Embodiment 13: this embodiment and embodiment 11 are different be take by weighing by ratio of weight and the number of copies in the step 1 10 parts wood fibre with fire retardant, 60 parts lignocellulosic material, 40 parts thermoplastics, 10 parts plastics with fire retardant, 3 parts coupling agent, 1 part lubricant, 1.5 parts oxidation inhibitor, 3 parts the auxiliary agent that presses down fumicants and 2 parts.Other step and parameter are identical with embodiment 11.
Embodiment 14: this embodiment is different with one of embodiment 11 to 13 is that the particle order number of lignocellulosic material in the step 1 is 10～300 orders.Other is identical with one of embodiment one to five.Other step and parameter are identical with one of embodiment 11 to 13.
Embodiment 15: this embodiment is different with one of embodiment 11 to 14 is that the polymerization degree of high-polymerization degree ammonium polyphosphate in the step 1 is greater than 1000.Other step and parameter are identical with one of embodiment 11 to 14.
Embodiment 16: what this embodiment was different with one of embodiment 11 to 15 is that the water ratio that under 105 ℃, is dried in the step 3 in the material is 0.5%.Other step and parameter are identical with one of embodiment 11 to 15.
Embodiment 17: what this embodiment was different with one of embodiment 11 to 15 is that the water ratio that under 105 ℃, is dried in the step 3 in the material is 3%.Other step and parameter are identical with one of embodiment 11 to 15.
Embodiment 18: what this embodiment was different with one of embodiment 11 to 15 is that the water ratio that under 105 ℃, is dried in the step 3 in the material is 1%.Other step and parameter are identical with one of embodiment 11 to 15.
Embodiment 19: this embodiment is different with one of embodiment 11 to 18 is that to use fire retardant to place temperature in the thermoplastics that takes by weighing and plastics in the step 4 be that 140～180 ℃, screw speed carry out melt pelletization as the twin screw extruder of 100r/min.Other step and parameter are identical with one of embodiment 11 to 18.
Embodiment 20: this embodiment is different with one of embodiment 11 to 18 is that to use fire retardant to place temperature in the thermoplastics that takes by weighing and plastics in the step 4 be that 140～180 ℃, screw speed carry out melt pelletization as the twin screw extruder of 50r/min.Other step and parameter are identical with one of embodiment 11 to 18.
Embodiment 21: this embodiment is different with one of embodiment 11 to 18 is that to use fire retardant to place temperature in the thermoplastics that takes by weighing and plastics in the step 4 be that 140～180 ℃, screw speed carry out melt pelletization as the twin screw extruder of 80r/min.Other step and parameter are identical with one of embodiment 11 to 18.
Embodiment 22: this embodiment is different with one of embodiment 11 to 21 is under temperature is 70 ℃ condition, to mix 20min in the step 5, obtains Preblend.Other step and parameter are identical with one of embodiment 11 to 21.
Embodiment 23: this embodiment is different with one of embodiment 11 to 21 is under temperature is 120 ℃ condition, to mix 5min in the step 5, obtains Preblend.Other step and parameter are identical with one of embodiment 11 to 21.
Embodiment 24: this embodiment is different with one of embodiment 11 to 21 is under temperature is 100 ℃ condition, to mix 10min in the step 5, obtains Preblend.Other step and parameter are identical with one of embodiment 11 to 21.
Embodiment 25: this embodiment is different with one of embodiment 11 to 24 is that to place temperature to be that 135～170 ℃, screw speed are that the twin screw extruder of 50r/min carries out fusion Preblend in the step 6 compound, obtains melt material.Other step and parameter are identical with one of embodiment 11 to 24.
Embodiment 26: this embodiment is different with one of embodiment 11 to 24 is that to place temperature to be that 135～170 ℃, screw speed are that the twin screw extruder of 30r/min carries out fusion Preblend in the step 6 compound, obtains melt material.Other step and parameter are identical with one of embodiment 11 to 24.
Embodiment 27: this embodiment is different with one of embodiment 11 to 24 is that to place temperature to be that 135～170 ℃, screw speed are that the twin screw extruder of 40r/min carries out fusion Preblend in the step 6 compound, obtains melt material.Other step and parameter are identical with one of embodiment 11 to 24.
Embodiment 28: this embodiment is different with one of embodiment 11 to 27 is that to extrude in the step 7 be to adopt conical double screw extruder, parallel double-screw extruder or single screw rod bar forcing machine with the melt material extrusion moulding.Other step and parameter are identical with one of embodiment 11 to 27.
Embodiment 29: this embodiment is different with one of embodiment 11 to 28 is that hot pressing or compression molding are melt material to be placed be hot pressed into sheet material or special-shaped product on the thermocompressor in the step 7.Other step and parameter are identical with one of embodiment 11 to 28.
Embodiment 30: the preparation method of the high wooden content wood plastic composite of this embodiment flame retardant type carries out according to the following steps: one, take by weighing by ratio of weight and the number of copies 6 parts wood fibre with fire retardant, 60 parts lignocellulosic material, 40 parts thermoplastics, 12 parts plastics with fire retardant, 3 parts coupling agent, 2 parts lubricant, 1 part oxidation inhibitor and 2 parts but fumicants; Two, the wood fibre that takes by weighing is hybridly prepared into fire-retardant treatment liquid with fire retardant and water; Three, the lignocellulosic material that takes by weighing is put in the high-speed mixer, and on lignocellulosic material, sprayed fire-retardant treatment liquid, get material, the water ratio that under 105 ℃, is dried in the material then is 2%, obtains fire-retardant lignocellulosic material; Four, using fire retardant to place temperature in the thermoplastics that takes by weighing and plastics is that 140～180 ℃, screw speed carry out melt pelletization as the twin screw extruder of 70r/min, obtains flame-proofed thermoplastic plastic substrate particle; Five, with fire-retardant lignocellulosic material, flame-proofed thermoplastic plastic substrate particle, coupling agent, lubricant, oxidation inhibitor, press down fumicants and auxiliary agent is put in the high-speed mixer, be to mix 15min under 80 ℃ the condition in temperature, obtain Preblend; Six, it is compound to place temperature to be that 135～170 ℃, screw speed are that the twin screw extruder of 30r/min carries out fusion Preblend, obtains melt material; Seven, melt material is through promptly obtaining the high wooden content wood plastic composite of flame retardant type after hot-forming; Wherein wood fibre uses fire retardant to be the phosphoric acid guanylurea in the step 1; Lignocellulosic material is a wood powder; Thermoplastics is a Vilaterm; Plastics use fire retardant to be the high-polymerization degree ammonium polyphosphate; Coupling agent is the Vilaterm of modified by maleic acid anhydride graft; Lubricant is a paraffin; Oxidation inhibitor is antioxidant 1010; Pressing down fumicants is zinc borate; Wood fibre is to mix at 6: 150 according to ratio of weight and number with fire retardant and water in the step 2.
The particle order number of lignocellulosic material is 80～100 orders in this embodiment step 1.
Hot-forming in this embodiment step 7 is that melt material is placed on the thermocompressor, is at platen temperature up and down that hot pressing 2～3min forms sheet material under 150～160 ℃ the condition.
It is as shown in table 1, visible that this embodiment prepares the performance index of the high wooden content wood plastic composite of obtained flame-retardant type, and mechanical property and flame retardant properties that this embodiment prepares the high wooden content wood plastic composite of obtained flame-retardant type are good.
Table 1
The embodiment hentriaconta-: the preparation method of the high wooden content wood plastic composite of this embodiment flame retardant type carries out according to the following steps: one, take by weighing by ratio of weight and the number of copies 14 parts wood fibre with fire retardant, 70 parts lignocellulosic material, 30 parts thermoplastics, 5 parts plastics with fire retardant, 3.5 parts coupling agent, 2 parts lubricant, 2 parts oxidation inhibitor and 2 parts but fumicants; Two, the wood fibre that takes by weighing is hybridly prepared into fire-retardant treatment liquid with fire retardant and water; Three, the lignocellulosic material that takes by weighing is put in the high-speed mixer, and on lignocellulosic material, sprayed fire-retardant treatment liquid, get material, the water ratio that under 105 ℃, is dried in the material then is 2%, obtains fire-retardant lignocellulosic material; Four, using fire retardant to place temperature in the thermoplastics that takes by weighing and plastics is that 140～180 ℃, screw speed carry out melt pelletization as the twin screw extruder of 50r/min, obtains flame-proofed thermoplastic plastic substrate particle; Five, with fire-retardant lignocellulosic material, flame-proofed thermoplastic plastic substrate particle, coupling agent, lubricant, oxidation inhibitor, press down fumicants and auxiliary agent is put in the high-speed mixer, be to mix 15min under 80 ℃ the condition in temperature, obtain Preblend; Six, it is compound to place temperature to be that 135～170 ℃, screw speed are that the twin screw extruder of 30r/min carries out fusion Preblend, obtains melt material; Seven, melt material is through promptly obtaining the high wooden content wood plastic composite of flame retardant type after hot-forming; Wherein wood fibre uses fire retardant to be the phosphoric acid guanylurea in the step 1; Lignocellulosic material is a wood powder; Thermoplastics is a Vilaterm; Plastics use fire retardant to be the high-polymerization degree ammonium polyphosphate; Coupling agent is the Vilaterm of modified by maleic acid anhydride graft; Lubricant is the mixture of paraffin and polyethylene wax; Oxidation inhibitor is antioxidant 1010; Pressing down fumicants is zinc borate; Wood fibre is to mix at 14: 175 according to ratio of weight and number with fire retardant and water in the step 2.
Lubricant is that paraffin and polyethylene wax mixed in 1: 1 by volume in this embodiment step 1.
The particle order number of lignocellulosic material is 80～100 orders in this embodiment step 1.
Hot-forming in this embodiment step 7 is that melt material is placed on the thermocompressor, is at platen temperature up and down that hot pressing 2～3min forms sheet material under 150～160 ℃ the condition.
It is as shown in table 2, visible that this embodiment prepares the performance index of the high wooden content wood plastic composite of obtained flame-retardant type, and mechanical property and flame retardant properties that this embodiment prepares the high wooden content wood plastic composite of obtained flame-retardant type are good.
Table 2
Embodiment 32: the preparation method of the high wooden content wood plastic composite of this embodiment flame retardant type carries out according to the following steps: one, take by weighing by ratio of weight and the number of copies 12 parts wood fibre with fire retardant, 60 parts lignocellulosic material, 40 parts thermoplastics, 6 parts plastics with fire retardant, 3 parts coupling agent, 2 parts lubricant, 1 part oxidation inhibitor, 2 parts but the auxiliary agent of fumicants and 1 part; Two, the wood fibre that takes by weighing is hybridly prepared into fire-retardant treatment liquid with fire retardant and water; Three, the lignocellulosic material that takes by weighing is put in the high-speed mixer, and on lignocellulosic material, sprayed fire-retardant treatment liquid, get material, the water ratio that under 105 ℃, is dried in the material then is 2%, obtains fire-retardant lignocellulosic material; Four, using fire retardant to place temperature in the thermoplastics that takes by weighing and plastics is that 140～180 ℃, screw speed carry out melt pelletization as the twin screw extruder of 50r/min, obtains flame-proofed thermoplastic plastic substrate particle; Five, with fire-retardant lignocellulosic material, flame-proofed thermoplastic plastic substrate particle, coupling agent, lubricant, oxidation inhibitor, press down fumicants and auxiliary agent is put in the high-speed mixer, be to mix 10min under 100 ℃ the condition in temperature, obtain Preblend; Six, it is compound to place temperature to be that 135～170 ℃, screw speed are that the twin screw extruder of 30r/min carries out fusion Preblend, obtains melt material; Seven, melt material is through promptly obtaining the high wooden content wood plastic composite of flame retardant type after hot-forming; Wherein wood fibre uses fire retardant to be the phosphoric acid guanylurea in the step 1; Lignocellulosic material is a wood powder; Thermoplastics is a Vestolen PP 7052; Plastics use fire retardant to be the high-polymerization degree ammonium polyphosphate; Coupling agent is the Vestolen PP 7052 of modified by maleic acid anhydride graft; Lubricant is an OPE; Oxidation inhibitor is antioxidant 1076; Pressing down fumicants is Marinco H; Auxiliary agent is a Paris white; Wood fibre is to mix at 12: 150 according to ratio of weight and number with fire retardant and water in the step 2.
The particle order number of lignocellulosic material is 80～100 orders in this embodiment step 1.
Hot-forming in this embodiment step 7 is that melt material is placed on the thermocompressor, is at platen temperature up and down that hot pressing 2～3min forms sheet material under 150～160 ℃ the condition.
It is as shown in table 3, visible that this embodiment prepares the performance index of the high wooden content wood plastic composite of obtained flame-retardant type, and mechanical property and flame retardant properties that this embodiment prepares the high wooden content wood plastic composite of obtained flame-retardant type are good.
Table 3
Embodiment 33: the preparation method of the high wooden content wood plastic composite of this embodiment flame retardant type carries out according to the following steps: one, take by weighing by ratio of weight and the number of copies 6 parts wood fibre with fire retardant, 60 parts lignocellulosic material, 40 parts thermoplastics, 12 parts plastics with fire retardant, 3 parts coupling agent, 2 parts lubricant, 1.5 parts oxidation inhibitor, 3 parts but the auxiliary agent of fumicants and 2 parts; Two, the wood fibre that takes by weighing is hybridly prepared into fire-retardant treatment liquid with fire retardant and water; Three, the lignocellulosic material that takes by weighing is put in the high-speed mixer, and on lignocellulosic material, sprayed fire-retardant treatment liquid, get material, the water ratio that under 105 ℃, is dried in the material then is 2%, obtains fire-retardant lignocellulosic material; Four, using fire retardant to place temperature in the thermoplastics that takes by weighing and plastics is that 140～180 ℃, screw speed carry out melt pelletization as the twin screw extruder of 50r/min, obtains flame-proofed thermoplastic plastic substrate particle; Five, with fire-retardant lignocellulosic material, flame-proofed thermoplastic plastic substrate particle, coupling agent, lubricant, oxidation inhibitor, press down fumicants and auxiliary agent is put in the high-speed mixer, be to mix 15min under 80 ℃ the condition in temperature, obtain Preblend; Six, it is compound to place temperature to be that 135～170 ℃, screw speed are that the twin screw extruder of 30r/min carries out fusion Preblend, obtains melt material; Seven, melt material is through promptly obtaining the high wooden content wood plastic composite of flame retardant type after hot-forming; Wherein wood fibre uses fire retardant to be ammonium polyphosphate in the step 1; Lignocellulosic material is a straw powder; Thermoplastics is the Vilaterm reclaimed materials; Plastics use fire retardant to be melamine cyanurate; Coupling agent is the modified by maleic acid anhydride graft Vilaterm; Lubricant is a polyethylene wax; Oxidation inhibitor is oxidation inhibitor 1035; Pressing down fumicants is white lake; Auxiliary agent is a talcum powder; Wood fibre is to mix at 6: 150 according to ratio of weight and number with fire retardant and water in the step 2.
The particle order number of lignocellulosic material is 80～100 orders in this embodiment step 1.
Hot-forming in this embodiment step 7 is that melt material is placed on the thermocompressor, is at platen temperature up and down that hot pressing 2～3min forms sheet material under 150～160 ℃ the condition.
It is as shown in table 4, visible that this embodiment prepares the performance index of the high wooden content wood plastic composite of obtained flame-retardant type, and mechanical property and flame retardant properties that this embodiment prepares the high wooden content wood plastic composite of obtained flame-retardant type are good.
Table 4
Embodiment 34: the preparation method of the high wooden content wood plastic composite of this embodiment flame retardant type carries out according to the following steps: one, take by weighing by ratio of weight and the number of copies 9 parts wood fibre with fire retardant, 60 parts lignocellulosic material, 40 parts thermoplastics, 9 parts plastics with fire retardant, 3 parts coupling agent, 2 parts lubricant, 1 part oxidation inhibitor, 2 parts but the auxiliary agent of fumicants and 3 parts; Two, the wood fibre that takes by weighing is hybridly prepared into fire-retardant treatment liquid with fire retardant and water; Three, the lignocellulosic material that takes by weighing is put in the high-speed mixer, and on lignocellulosic material, sprayed fire-retardant treatment liquid, get material, the water ratio that under 105 ℃, is dried in the material then is 2%, obtains fire-retardant lignocellulosic material; Four, using fire retardant to place temperature in the thermoplastics that takes by weighing and plastics is that 140～180 ℃, screw speed carry out melt pelletization as the twin screw extruder of 50r/min, obtains flame-proofed thermoplastic plastic substrate particle; Five, with fire-retardant lignocellulosic material, flame-proofed thermoplastic plastic substrate particle, coupling agent, lubricant, oxidation inhibitor, press down fumicants and auxiliary agent is put in the high-speed mixer, be to mix 10min under 100 ℃ the condition in temperature, obtain Preblend; Six, it is compound to place temperature to be that 135～170 ℃, screw speed are that the twin screw extruder of 30r/min carries out fusion Preblend, obtains melt material; Seven, melt material is through promptly obtaining the high wooden content wood plastic composite of flame retardant type after hot-forming; Wherein wood fibre uses fire retardant to be the phosphoric acid guanylurea in the step 1; Lignocellulosic material is a powdered rice hulls; Thermoplastics is a Vilaterm; Plastics use fire retardant to be the high-polymerization degree ammonium polyphosphate; Coupling agent is the modified by maleic acid anhydride graft Vilaterm; Lubricant is a paraffin; Oxidation inhibitor is antioxidant 1010; Pressing down fumicants is zinc borate; Auxiliary agent is a Calucium Silicate powder; Wood fibre is to mix at 9: 150 according to ratio of weight and number with fire retardant and water in the step 2.
The particle order number of lignocellulosic material is 100～120 orders in this embodiment step 1.
Hot-forming in this embodiment step 7 is that melt material is placed on the thermocompressor, is at platen temperature up and down that hot pressing 2～3min forms sheet material under 150～160 ℃ the condition.
It is as shown in table 5, visible that this embodiment prepares the performance index of the high wooden content wood plastic composite of obtained flame-retardant type, and mechanical property and flame retardant properties that this embodiment prepares the high wooden content wood plastic composite of obtained flame-retardant type are good.
Table 5
Claims (9)
1. the high wooden content wood plastic composite of flame retardant type, it is characterized in that the high wooden content wood plastic composite of flame retardant type by ratio of weight and the number of copies by 5～25 parts wood fibre with fire retardant, 50～70 parts lignocellulosic material, 30～50 parts thermoplastics, 5～25 parts plastics with fire retardant, 2～8 parts coupling agent, 1～3 part lubricant, 0.1～3 part oxidation inhibitor, 1～5 part but the auxiliary agent of fumicants and 0～5 part process; Wherein wood fibre uses fire retardant to be phosphoric acid guanylurea, fire retardant FR W, methylolation phosphoric acid guanylurea, ammonium polyphosphate, ammonium pyrophosphate, ammonium hydrogen phosphate, primary ammonium phosphate, ammonium sulfate, trimeric cyanamide or melamine pyrophosphate; Lignocellulosic material is one or more the mixture in wood powder, powdered rice hulls, bamboo bits, straw powder, shell powder, bagasse, the flaxen fiber; Thermoplastics is one or more the mixture in Vilaterm, Vestolen PP 7052, Vilaterm reclaimed materials or the Vestolen PP 7052 reclaimed materials; Plastics use fire retardant to be high-polymerization degree ammonium polyphosphate, red phosphorus, expansible black lead, melamine cyanurate or SULPHOSUCCINIC ACID ESTER; Coupling agent is one or more the mixture in the Vestolen PP 7052 of Vilaterm, modified by maleic acid anhydride graft of titanic acid ester, aluminic acid ester, isocyanic ester, silane coupling agent, modified by maleic acid anhydride graft; Lubricant is one or more the mixture in paraffin, polyethylene wax, Poly Propylene Wax, OPE, Triple Pressed Stearic Acid, the Metallic stearates; Oxidation inhibitor is oxidation inhibitor 168, antioxidant 1010, antioxidant 264, antioxidant 1076, antioxidant 2246, oxidation inhibitor 1035, antioxidant 3114, oxidation inhibitor 1790,2; The mixture of one or more in 6-di-tert-butyl-4-methy phenol, tricresyl phosphite (2, the 4-di-tert-butyl-phenyl) ester; Pressing down fumicants is zinc borate, Marinco H, white lake, molybdic oxide, ammonium octamolybdate, Cu
2The mixture of one or more among the O; Auxiliary agent is Paris white, talcum powder, flyash, carbon black or Calucium Silicate powder.
2. the high wooden content wood plastic composite of flame retardant type according to claim 1, it is characterized in that the high wooden content wood plastic composite of flame retardant type by ratio of weight and the number of copies by 10～20 parts wood fibre with the lignocellulosic material of 55～65 parts of fire retardants, 35～45 parts thermoplastics, 10～20 parts plastics with fire retardant, 3～7 parts coupling agent, 1.5～2.5 parts lubricant, 0.5～2 part oxidation inhibitor, 2～4 parts but the auxiliary agent of fumicants and 1～4 part process.
3. the high wooden content wood plastic composite of flame retardant type according to claim 1, it is characterized in that the high wooden content wood plastic composite of flame retardant type by ratio of weight and the number of copies by 15 parts wood fibre with fire retardant, 60 parts lignocellulosic material, 40 parts thermoplastics, 15 parts plastics with fire retardant, 5 parts coupling agent, 2 parts lubricant, 1 part oxidation inhibitor, 3 parts but the auxiliary agent of fumicants and 3 parts process.
4. according to claim 1, the high wooden content wood plastic composite of 2 or 3 described flame retardant types, it is characterized in that the particle order number of lignocellulosic material is 10～300 orders.
5. the high wooden content wood plastic composite of flame retardant type according to claim 1, the polymerization degree that it is characterized in that the high-polymerization degree ammonium polyphosphate is greater than 1000.
6. the method for preparing the high wooden content wood plastic composite of flame retardant type as claimed in claim 1 is characterized in that the preparation method of the high wooden content wood plastic composite of flame retardant type carries out according to the following steps: one, take by weighing by ratio of weight and the number of copies 5～25 parts wood fibre with fire retardant, 50～70 parts lignocellulosic material, 30～50 parts thermoplastics, 5～25 parts plastics with fire retardant, 2～8 parts coupling agent, 1～3 part lubricant, 0.1～3 part oxidation inhibitor, 1～5 part but the auxiliary agent of fumicants and 0～5 part; Two, the wood fibre that takes by weighing is hybridly prepared into fire-retardant treatment liquid with fire retardant and water; Three, the lignocellulosic material that takes by weighing is put in the high-speed mixer, and on lignocellulosic material, sprayed fire-retardant treatment liquid, get material, the water ratio that under 105 ℃, is dried in the material then is 0.5%～3%, obtains fire-retardant lignocellulosic material; Four, using fire retardant to place temperature in the thermoplastics that takes by weighing and plastics is that 140～180 ℃, screw speed are that the twin screw extruder of 50～100r/min carries out melt pelletization, obtains flame-proofed thermoplastic plastic substrate particle; Five, with fire-retardant lignocellulosic material, flame-proofed thermoplastic plastic substrate particle, coupling agent, lubricant, oxidation inhibitor, press down fumicants and auxiliary agent is put in the high-speed mixer, be to mix 5～20min under 70～120 ℃ the condition in temperature, obtain Preblend; Six, it is compound to place temperature to be that 135～170 ℃, screw speed are that the twin screw extruder of 30～50r/min carries out fusion Preblend, obtains melt material; Seven, melt material is through extruding, promptly obtaining the high wooden content wood plastic composite of flame retardant type after injection moulding, hot pressing or the compression molding; Wherein wood fibre uses fire retardant to be phosphoric acid guanylurea, fire retardant FR W, methylolation phosphoric acid guanylurea, ammonium polyphosphate, ammonium pyrophosphate, ammonium hydrogen phosphate, primary ammonium phosphate, ammonium sulfate, trimeric cyanamide or melamine pyrophosphate in the step 1; Lignocellulosic material is one or more the mixture in wood powder, powdered rice hulls, bamboo bits, straw powder, shell powder, bagasse, the flaxen fiber; Thermoplastics is one or more the mixture in Vilaterm, Vestolen PP 7052, Vilaterm reclaimed materials or the Vestolen PP 7052 reclaimed materials; Plastics use fire retardant to be high-polymerization degree ammonium polyphosphate, red phosphorus, expansible black lead, melamine cyanurate or SULPHOSUCCINIC ACID ESTER; Coupling agent is one or more the mixture in the Vestolen PP 7052 of Vilaterm, modified by maleic acid anhydride graft of titanic acid ester, aluminic acid ester, isocyanic ester, silane coupling agent, modified by maleic acid anhydride graft; Lubricant is one or more the mixture in paraffin, polyethylene wax, Poly Propylene Wax, OPE, Triple Pressed Stearic Acid, the Metallic stearates; Oxidation inhibitor is oxidation inhibitor 168, antioxidant 1010, antioxidant 264, antioxidant 1076, antioxidant 2246, oxidation inhibitor 1035, antioxidant 3114, oxidation inhibitor 1790,2; The mixture of one or more in 6-di-tert-butyl-4-methy phenol, tricresyl phosphite (2, the 4-di-tert-butyl-phenyl) ester; Pressing down fumicants is zinc borate, Marinco H, white lake, molybdic oxide, ammonium octamolybdate, Cu
2The mixture of one or more among the O; Auxiliary agent is Paris white, talcum powder, flyash, carbon black or Calucium Silicate powder; Wood fibre with fire retardant and water is according to ratio of weight and number 5～25 in the step 2: 125～175 mix.
7. the preparation method of the high wooden content wood plastic composite of flame retardant type according to claim 6 is characterized in that in the step 4 that using fire retardant to place temperature in the thermoplastics that takes by weighing and plastics is that 140～180 ℃, screw speed carry out melt pelletization as the twin screw extruder of 80r/min.
8. according to the preparation method of claim 6 or the high wooden content wood plastic composite of 7 described flame retardant types, it is characterized in that extruding in the step 7 is to adopt conical double screw extruder, parallel double-screw extruder or single screw rod bar forcing machine with the melt material extrusion moulding.
9. according to the preparation method of claim 6 or the high wooden content wood plastic composite of 7 described flame retardant types, it is characterized in that in the step 7 that hot pressing or compression molding are melt material to be placed be hot pressed into sheet material or special-shaped product on the thermocompressor.
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