CN105670122A - Vermiculite-powder-modified polypropylene wood-plastic flame-retardant foamed composite material and preparation method thereof - Google Patents
Vermiculite-powder-modified polypropylene wood-plastic flame-retardant foamed composite material and preparation method thereof Download PDFInfo
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- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
- C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
- C08L23/10—Homopolymers or copolymers of propene
- C08L23/12—Polypropene
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- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
- C08J9/04—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent
- C08J9/06—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent by a chemical blowing agent
- C08J9/10—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent by a chemical blowing agent developing nitrogen, the blowing agent being a compound containing a nitrogen-to-nitrogen bond
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- C08J2203/00—Foams characterized by the expanding agent
- C08J2203/04—N2 releasing, ex azodicarbonamide or nitroso compound
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- C08J2323/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
- C08J2323/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
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- C08J2497/00—Characterised by the use of lignin-containing materials
- C08J2497/02—Lignocellulosic material, e.g. wood, straw or bagasse
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- C08L2205/00—Polymer mixtures characterised by other features
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- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/08—Polymer mixtures characterised by other features containing additives to improve the compatibility between two polymers
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Abstract
The invention belongs to the field of high-polymer composite material processing, and particularly relates to a vermiculite-powder-modified polypropylene wood-plastic flame-retardant foamed composite material and a preparation method thereof. The composite material is prepared from 20-40 parts of poplar powder, 10-20 parts of vermiculite powder, 50-70 parts of polypropylene, 5-10 parts of compatilizer, 2-3 parts of coupling agent, 1-2 parts of modified AC (azodicarbonamide) foaming agent, 10-15 parts of flame retardant, 3-5 parts of foaming regulator, 3 parts of lubricant, 2 parts of talcum powder and 1 part of antioxidant. The preparation method comprises the following steps: carrying out alkalifying pretreatment on the poplar powder, and mixing the raw materials at high speed to obtain a premix; adding into a double screw extruder, and carrying out melt extrusion; and adding into an injection machine, and carrying out machine shaping to obtain the composite material. By carrying out alkalifying pretreatment on the poplar powder and adding the coupling agent and compatilizer, the interface compatibility between the poplar powder and polypropylene is improved. The vermiculite powder is added instead of part of wood meal, thereby increasing the wear resistance of the composite material, reducing the density and enhancing the bending strength and impact strength of the composite material.
Description
Technical field
The invention belongs to polymer composite manufacture field, be specifically related to a kind of vermiculite power modified polypropene wood and mould flame-retardant expanded composite and preparation method thereof.
Background technology
Wood plastic composite refers to a kind of new material between timber and plastics that Plant fiber's powder and resin compounded through pretreatment obtain, it had both remained the characteristic of wooden outward appearance secondary operations acceptable with as timber, have again polyacrylic thermoplasticity, simultaneously, its dimensional stability is better than timber, have be not afraid of damage by worms, the advantage such as water absorption is low, repeatable utilization. Therefore it replaces timber and resin all to receive much concern in the field such as packaging, building, decoration, automobile, environmental conservation. But, owing to the hydrophilic wood fiber and hydrophobic plastic part cohesive force are little, cause that the mechanical property of wood plastic product is poorer than pure plastics, and the wood fiber is made the density of wood plastic product generally higher by compressing and compacting in the course of processing, and distribution of cells is uneven, fluidity of molten is poor.
Polypropylene wood-plastic composite material (PP-WPC) is as the succedaneum of timber when outdoor application, and the phenomenon that size is unstable occurs in the impact of easy climate. Such as, when the temperature varies, material there will be the phenomenon expanded with heat and contract with cold, and when rainy, dilatancy phenomenon can occur because of water suction in material. PP-WPC for high wood powder content, if plant fibre surface processes bad, more it is easily caused the consequence of imbibition deformation, therefore, require over the new formula of design and new technology to solve this problem, to prepare the Polypropylene wood-plastic composite material of dimensional stability height (thermal linear expansion coefficient is little, expansion rate of water absorption is low).
A lot of hydroxyl is there is in prior art in wood powder surface, there is very strong polarity, hydrophilic is very strong, therefore wood powder and nonpolar PP are difficult to compatible, if directly the mechanical property of the PP-WPC that mixing prepares is by very poor, mostly adopting again and add the compatilizer method to improve the interface compatibility of wood powder and PP, cost is high, weak effect. And the wood fiber is made the density of wood plastic product generally higher by compressing and compacting in the course of processing, and distribution of cells is uneven, and fluidity of molten is poor.
Owing to excessively developing of natural resources made timber price go up in recent years, high wood powder addition makes molding composite board cost increase, and wood powder and PP broadly fall into combustibles, wood plastic composite very easily burns, and combustion process can produce thick smoke, very easily initiation fire cause great loss of personal property in routine use process. The shortcomings such as not foamed PP wood moulds density greatly, and poor mechanical property is not easily processed, and aesthetics and practicality are not enough and easily aging in outdoor utilization process simultaneously, not wear-resisting. These shortcomings all strongly limit the application of Wood Plastics Composite Product.
Summary of the invention
The present invention is directed to the deficiencies in the prior art, it is therefore intended that provide a kind of vermiculite power modified polypropene wood to mould flame-retardant expanded composite and preparation method thereof.
For achieving the above object, the technical solution used in the present invention is:
The preparation method that flame-retardant expanded composite moulded by a kind of vermiculite power modified polypropene wood, comprises the steps:
(1) wood powder alkalization pretreatment: be at room temperature soaked in by Poplar Powder in NaOH solution and carry out alkalization pretreatment, is washed to neutrality subsequently, dries, and the Poplar Powder obtained is standby;
(2) each raw material components is calculated by weight as: step (1) gained Poplar Powder 20～40 parts, vermiculite power 10～20 parts, polypropylene 50～70 parts, compatilizer 5～10 parts, coupling agent 2～3 parts, modified AC foaming agent 1～2 part, fire retardant 10～15 parts, foaming control agent 3～5 parts, lubricant 3 parts, Pulvis Talci 2 parts, 1 part of antioxidant, each raw material components is placed in high-speed mixer high speed and is mixed and made into premix material;
(3) preparation of polypropylene flame redardant Wood-plastic foam composite master batch: step (2) gained premix material is added in double screw extruder and melt extrudes, extruded stock is cooled, obtain polypropylene flame redardant Wood-plastic foam composite master batch after pelletize;
(4) preparation of polypropylene flame redardant Wood-plastic foam composite: added in injector by polypropylene flame redardant Wood-plastic foam composite master batch, uses the vermiculite power modified polypropene wood that required form prepared by corresponding mould to mould flame-retardant expanded composite.
In such scheme, the mass concentration of step (1) described NaOH solution is 5%, and the time of alkalization pretreatment is 24h.
In such scheme, step (2) described compatilizer is maleic anhydride inoculated polypropylene.
In such scheme, step (2) described coupling agent is Silane coupling agent KH550.
In such scheme, the modifying agent of the described modified AC foaming agent of step (2) is zinc oxide, and described modified AC foaming agent is to be mixed with obtained by modifying agent zinc oxide and AC foaming agent.
In such scheme, step (2) described fire retardant is response type environmental protection P, N, Br compound system fire retardant FR 8000.
In such scheme, step (2) described foaming control agent is cinnamic acrylic ester based terpolymers (St-ACR), it is prepared through multi-step emulsion polymerizations reaction by methyl methacrylate, butyl acrylate and styrene monomer, is a kind of super high molecular weight polymer with multiple structure.
In such scheme, step (2) described lubricant is stearic acid and liquid paraffin.
In such scheme, step (2) described antioxidant is 2,6-tri-grades of butyl-4-methylphenols.
In such scheme, the rotating speed of step (2) described mixed at high speed is 900～1100 revs/min, and incorporation time is 5min.
In such scheme, the temperature in each district of step (3) described double screw extruder is T1=190 DEG C, T2=195 DEG C, T3=195 DEG C, T4=195 DEG C, TMould=200 DEG C, extruded velocity 0.6m/min.
In such scheme, the processing and forming temperature of step (4) described injector is 185～195 DEG C.
Beneficial effects of the present invention:
(1) wood powder is carried out alkalization pretreatment by the present invention, is also added into coupling agent, compatilizer, significantly improves the wood fiber and polyacrylic interface compatibility, makes the water absorption rate of wood plastic composite reduce and improve the mechanical property of wood plastic composite;
(2) present invention adds inorganic vermiculite powder and serves as filler and fire retarding synergist, the addition of appropriate inorganic vermiculite powder can improve bending property and the impact property of wood plastic composite, and vermiculite power has excellent heat stability and dimensional stability, also there is the properties such as heat insulation, fire-retardant, sound absorption, high abrasion simultaneously; Vermiculite power is less than wood powder density and inexpensive as inorganic filler, for reducing density and the water absorption rate of composite in wood plastic composite further, can also improve fire resistance and the friction resistant ability of composite simultaneously;
(3) AC foaming agent is modified by the present invention by adding nano oxygen agent, reduces the decomposition temperature of AC foaming agent so that the decomposition temperature of foaming agent is lower than 200 DEG C, it is to avoid too high processing temperature makes wood powder gelatinizing and produces energy waste, it is additionally added polyacrylate foaming control agent simultaneously, foaming aperture and density are adjusted, optimize foaming effect and the melt strength of composite, strengthen Stress Transfer, the mechanical performance and the processing characteristics that make composite are strengthened, wood plastic composite has good foam structure, crack tip can be passivated, stop the extension of crackle, thus it is big efficiently against common wood-plastic composite fragility, ductility and the low shortcoming of shock resistance stress, and reduce the density of material, not only conservation, and sound insulation, heat-proof quality is also better, there is more accurate apparent size, surface property is more outstanding, and have more woodiness touch,
(4) present invention is by adding FR8000 efficient flame-retarding agent, forms synergistic fire retarding effect with the inorganic vermiculite powder added, it is possible to while reducing fire retardant addition, promotes the flame retardant effect of composite.
Accompanying drawing explanation
Fig. 1 is the micro-SEM figure that flame-retardant expanded composite moulded by the vermiculite power modified polypropene wood that the present invention prepares.
Fig. 2 moulds the micro-SEM figure of flame-retardant expanded composite for the vermiculite power modified polypropene wood that the present invention prepares.
Fig. 3 is the TGA figure that flame-retardant expanded composite moulded by the vermiculite power modified polypropene wood that embodiment 3,4,7 prepares.
Fig. 4 is the DTG figure that flame-retardant expanded composite moulded by the vermiculite power modified polypropene wood that embodiment 3,4,7 prepares.
Detailed description of the invention
In order to be more fully understood that the present invention, it is further elucidated with present disclosure below in conjunction with embodiment, but present disclosure is not limited solely to the following examples.
In following example, described foaming control agent is cinnamic acrylic ester based terpolymers (St-ACR), it is prepared through multi-step emulsion polymerizations reaction by methyl methacrylate, butyl acrylate and styrene monomer, being a kind of super high molecular weight polymer with multiple structure, concrete preparation method is with reference to patent CN103980413A.
Embodiment 1
Flame-retardant expanded composite moulded by a kind of vermiculite power modified polypropene wood, comprises following material component: Poplar Powder 40 parts; Vermiculite power 10 parts; Polypropylene 50 parts; Maleic anhydride inoculated polypropylene 5 parts; Silane coupling agent KH550 2 parts; Modified AC foaming agent 1 part (AC foaming agent 0.9 part, nano zine oxide 0.1 part); FR8000 fire retardant 15 parts; Foaming control agent 3 parts; Lubricant 3 parts (stearic acid 1 part, liquid paraffin 2 parts); Pulvis Talci 2 parts; 2,6-tri-grades of butyl-4-methylphenols 1 part.
The preparation method that flame-retardant expanded composite moulded by above-mentioned vermiculite power modified polypropene wood is as follows:
(1) material pretreatment: take required quality Poplar Powder, it is soaked in equipped with in the vessel that mass fraction is 5%NaOH solution under room temperature, wood powder tap water basification crossed after 24h is to neutral, being dried to moisture content in air dry oven under 105 DEG C of conditions is about 3%, and powder process is standby; Unclassified stores is placed in air dry oven 80 DEG C dry 12h.
(2) dispensing: successively the raw material such as Poplar Powder after pretreatment, polypropylene (PP), compatilizer, coupling agent, modified AC foaming agent, fire retardant, foaming control agent, lubricant, Pulvis Talci, antioxidant is undertaken weighing standby by required quality.
(3) wood powder, polypropylene, processing aid high speed premix: each material being placed in high-speed mixer high speed and is mixed and made into premix material, dry for standby, the rotating speed of described mixed at high speed is 900 revs/min, and incorporation time is 5min.
(4) prepared by polypropylene flame redardant Wood-plastic foam composite master batch: preparation premix material is added in double screw extruder and melt extrudes, extruded stock is cooled, pelletize obtains polypropylene flame redardant Wood-plastic foam composite master batch, and the temperature in each district of described double screw extruder is T1=190 DEG C, T2=195 DEG C, T3=195 DEG C, T4=195 DEG C, TMould=200 DEG C, extruded velocity 0.6m/min.
(5) preparation of polypropylene flame redardant Wood-plastic foaming composite board material: being added in injector by polypropylene flame redardant Wood-plastic foam composite master batch, injector processing and forming temperature is 185 DEG C, uses corresponding mould to prepare the sheet material of required form.
Embodiment 2
Flame-retardant expanded composite moulded by a kind of vermiculite power modified polypropene wood, comprises following material component: Poplar Powder 30 parts; Vermiculite power 10 parts; Polypropylene 60 parts; Maleic anhydride inoculated polypropylene 5 parts; Silane coupling agent KH550 3 parts; Modified AC foaming agent 1 part (AC foaming agent 0.9 part, nano zine oxide 0.1 part); FR8000 fire retardant 15 parts; Foaming control agent 3 parts; Lubricant 3 parts (stearic acid 1 part, liquid paraffin 2 parts); Pulvis Talci 2 parts, 2,6-tri-grades of butyl-4-methylphenols 1 part.
The preparation method that flame-retardant expanded composite moulded by above-mentioned vermiculite power modified polypropene wood is as follows:
(1) material pretreatment: take required quality Poplar Powder, it is soaked in equipped with in the vessel that mass fraction is 5%NaOH solution under room temperature, wood powder tap water basification crossed after 24h is to neutral, being dried to moisture content in air dry oven under 105 DEG C of conditions is about 3%, and powder process is standby; Unclassified stores is placed in air dry oven 80 DEG C dry 12h.
(2) dispensing: successively the raw material such as Poplar Powder after pretreatment, polypropylene (PP), compatilizer, coupling agent, modified AC foaming agent, fire retardant, foaming control agent, lubricant, Pulvis Talci, antioxidant is undertaken weighing standby by required quality.
(3) wood powder, polypropylene, processing aid high speed premix: each material being placed in high-speed mixer high speed and is mixed and made into premix material, dry for standby, the rotating speed of described mixed at high speed is 1000 revs/min, and incorporation time is 5min.
(4) prepared by polypropylene flame redardant Wood-plastic foam composite master batch: preparation premix material is added in double screw extruder and melt extrudes, extruded stock is cooled, pelletize obtains polypropylene flame redardant Wood-plastic foam composite master batch, and the temperature in each district of described double screw extruder is T1=190 DEG C, T2=195 DEG C, T3=195 DEG C, T4=195 DEG C, TMould=200 DEG C, extruded velocity 0.6m/min.
(5) preparation of polypropylene flame redardant Wood-plastic foaming composite board material: being added in injector by polypropylene flame redardant Wood-plastic foam composite master batch, injector processing and forming temperature is 190 DEG C, uses corresponding mould to prepare the sheet material of required form.
Embodiment 3
Flame-retardant expanded composite moulded by a kind of vermiculite power modified polypropene wood, comprises following material component: Poplar Powder 20 parts; Vermiculite power 10 parts; Polypropylene 70 parts; Maleic anhydride inoculated polypropylene 5 parts; Silane coupling agent KH550 2 parts; Modified AC foaming agent 1 part (AC foaming agent 0.9 part, nano zine oxide 0.1 part); FR8000 fire retardant 15 parts; Foaming control agent 3 parts; Lubricant 3 parts (stearic acid 1 part, liquid paraffin 2 parts); Pulvis Talci 2 parts, 2,6-tri-grades of butyl-4-methylphenols 1 part.
The preparation method that flame-retardant expanded composite moulded by above-mentioned vermiculite power modified polypropene wood is as follows:
(1) material pretreatment: take required quality Poplar Powder, it is soaked in equipped with in the vessel that mass fraction is 5%NaOH solution under room temperature, wood powder tap water basification crossed after 24h is to neutral, being dried to moisture content in air dry oven under 105 DEG C of conditions is about 3%, and powder process is standby; Unclassified stores is placed in air dry oven 80 DEG C dry 12h.
(2) dispensing: successively the raw material such as Poplar Powder after pretreatment, polypropylene (PP), compatilizer, coupling agent, modified AC foaming agent, fire retardant, foaming control agent, lubricant, Pulvis Talci, antioxidant is undertaken weighing standby by required quality.
(3) wood powder, polypropylene, processing aid high speed premix: each material being placed in high-speed mixer high speed and is mixed and made into premix material, dry for standby, the rotating speed of described mixed at high speed is 1100 revs/min, and incorporation time is 5min.
(4) prepared by polypropylene flame redardant Wood-plastic foam composite master batch: preparation premix material is added in double screw extruder and melt extrudes, extruded stock is cooled, pelletize obtains polypropylene flame redardant Wood-plastic foam composite master batch, and the temperature in each district of described double screw extruder is T1=190 DEG C, T2=195 DEG C, T3=195 DEG C, T4=195 DEG C, TMould=200 DEG C, extruded velocity 0.6m/min.
(5) preparation of polypropylene flame redardant Wood-plastic foaming composite board material: being added in injector by polypropylene flame redardant Wood-plastic foam composite master batch, injector processing and forming temperature is 195 DEG C, uses corresponding mould to prepare the sheet material of required form.
Embodiment 4
Flame-retardant expanded composite moulded by a kind of vermiculite power modified polypropene wood, comprises following material component: Poplar Powder 20 parts; Vermiculite power 10 parts; Polypropylene 70 parts; Maleic anhydride inoculated polypropylene 5 parts; Silane coupling agent KH550 2 parts; Modified AC foaming agent 1 part (AC foaming agent 0.9 part, nano zine oxide 0.1 part); FR8000 fire retardant 10 parts; Foaming control agent 3 parts; Lubricant 3 parts (stearic acid 1 part, liquid paraffin 2 parts); Pulvis Talci 2 parts, 2,6-tri-grades of butyl-4-methylphenols 1 part.
The preparation method that flame-retardant expanded composite moulded by above-mentioned vermiculite power modified polypropene wood is as follows:
(1) material pretreatment: take required quality Poplar Powder, it is soaked in equipped with in the vessel that mass fraction is 5%NaOH solution under room temperature, wood powder tap water basification crossed after 24h is to neutral, being dried to moisture content in air dry oven under 105 DEG C of conditions is about 3%, and powder process is standby; Unclassified stores is placed in air dry oven 80 DEG C dry 12h.
(2) dispensing: successively the raw material such as Poplar Powder after pretreatment, polypropylene (PP), compatilizer, coupling agent, modified AC foaming agent, fire retardant, foaming control agent, lubricant, Pulvis Talci, antioxidant is undertaken weighing standby by required quality.
(3) wood powder, polypropylene, processing aid high speed premix: each material being placed in high-speed mixer high speed and is mixed and made into premix material, dry for standby, the rotating speed of described mixed at high speed is 1100 revs/min, and incorporation time is 5min.
(4) prepared by polypropylene flame redardant Wood-plastic foam composite master batch: preparation premix material is added in double screw extruder and melt extrudes, extruded stock is cooled, pelletize obtains polypropylene flame redardant Wood-plastic foam composite master batch, and the temperature in each district of described double screw extruder is T1=190 DEG C, T2=195 DEG C, T3=195 DEG C, T4=195 DEG C, TMould=200 DEG C, extruded velocity 0.6m/min.
(5) preparation of polypropylene flame redardant Wood-plastic foaming composite board material: being added in injector by polypropylene flame redardant Wood-plastic foam composite master batch, injector processing and forming temperature is 195 DEG C, uses corresponding mould to prepare the sheet material of required form.
Embodiment 5
Flame-retardant expanded composite moulded by a kind of vermiculite power modified polypropene wood, comprises following material component: Poplar Powder 15 parts; Vermiculite power 15 parts; Polypropylene 70 parts; Maleic anhydride inoculated polypropylene 5 parts; Silane coupling agent KH550 2 parts; Modified AC foaming agent 1 part (AC foaming agent 0.9 part, nano zine oxide 0.1 part); FR8000 fire retardant 10 parts; Foaming control agent 3 parts; Lubricant 3 parts (stearic acid 1 part, liquid paraffin 2 parts); Pulvis Talci 2 parts, 2,6-tri-grades of butyl-4-methylphenols 1 part.
The preparation method that flame-retardant expanded composite moulded by above-mentioned vermiculite power modified polypropene wood is as follows:
(1) material pretreatment: take required quality Poplar Powder, it is soaked in equipped with in the vessel that mass fraction is 5%NaOH solution under room temperature, wood powder tap water basification crossed after 24h is to neutral, being dried to moisture content in air dry oven under 105 DEG C of conditions is about 3%, and powder process is standby; Unclassified stores is placed in air dry oven 80 DEG C dry 12h.
(2) dispensing: successively the raw material such as Poplar Powder after pretreatment, polypropylene (PP), compatilizer, coupling agent, modified AC foaming agent, fire retardant, foaming control agent, lubricant, Pulvis Talci, antioxidant is undertaken weighing standby by required quality.
(3) wood powder, polypropylene, processing aid high speed premix: each material being placed in high-speed mixer high speed and is mixed and made into premix material, dry for standby, the rotating speed of described mixed at high speed is 1100 revs/min, and incorporation time is 5min.
(4) prepared by polypropylene flame redardant Wood-plastic foam composite master batch: preparation premix material is added in double screw extruder and melt extrudes, extruded stock is cooled, pelletize obtains polypropylene flame redardant Wood-plastic foam composite master batch, and the temperature in each district of described double screw extruder is T1=190 DEG C, T2=195 DEG C, T3=195 DEG C, T4=195 DEG C, TMould=200 DEG C, extruded velocity 0.6m/min.
(5) preparation of polypropylene flame redardant Wood-plastic foaming composite board material: being added in injector by polypropylene flame redardant Wood-plastic foam composite master batch, injector processing and forming temperature is 195 DEG C, uses corresponding mould to prepare the sheet material of required form.
Embodiment 6
Flame-retardant expanded composite moulded by a kind of vermiculite power modified polypropene wood, comprises following material component: Poplar Powder 10 parts; Vermiculite power 20 parts; Polypropylene 70 parts; Maleic anhydride inoculated polypropylene 5 parts; Silane coupling agent KH550 2 parts; Modified AC foaming agent 1 part (AC foaming agent 0.9 part, nano zine oxide 0.1 part); FR8000 fire retardant 15 parts; Foaming control agent 3 parts; Lubricant 3 parts (stearic acid 1 part, liquid paraffin 2 parts); Pulvis Talci 2 parts, 2,6-tri-grades of butyl-4-methylphenols 1 part.
The preparation method that flame-retardant expanded composite moulded by above-mentioned vermiculite power modified polypropene wood is as follows:
(1) material pretreatment: take required quality Poplar Powder, it is soaked in equipped with in the vessel that mass fraction is 5%NaOH solution under room temperature, wood powder tap water basification crossed after 24h is to neutral, being dried to moisture content in air dry oven under 105 DEG C of conditions is about 3%, and powder process is standby; Unclassified stores is placed in air dry oven 80 DEG C dry 12h.
(2) dispensing: successively the raw material such as Poplar Powder after pretreatment, polypropylene (PP), compatilizer, coupling agent, modified AC foaming agent, fire retardant, foaming control agent, lubricant, Pulvis Talci, antioxidant is undertaken weighing standby by required quality.
(3) wood powder, polypropylene, processing aid high speed premix: each material being placed in high-speed mixer high speed and is mixed and made into premix material, dry for standby, the rotating speed of described mixed at high speed is 1100 revs/min, and incorporation time is 5min.
(4) prepared by polypropylene flame redardant Wood-plastic foam composite master batch: preparation premix material is added in double screw extruder and melt extrudes, extruded stock is cooled, pelletize obtains polypropylene flame redardant Wood-plastic foam composite master batch, and the temperature in each district of described double screw extruder is T1=190 DEG C, T2=195 DEG C, T3=195 DEG C, T4=195 DEG C, TMould=200 DEG C, extruded velocity 0.6m/min.
(5) preparation of polypropylene flame redardant Wood-plastic foaming composite board material: being added in injector by polypropylene flame redardant Wood-plastic foam composite master batch, injector processing and forming temperature is 195 DEG C, uses corresponding mould to prepare the sheet material of required form.
Embodiment 7
Flame-retardant expanded composite moulded by a kind of vermiculite power modified polypropene wood, comprises following material component: Poplar Powder 20 parts; Vermiculite power 10 parts; Polypropylene 70 parts; Maleic anhydride inoculated polypropylene 5 parts; Silane coupling agent KH550 2 parts; Modified AC foaming agent 1.2 parts (AC foaming agent 1 part, nano zine oxide 0.2 part); FR8000 fire retardant 10 parts; Foaming control agent 5 parts; Lubricant 3 parts (stearic acid 1 part, liquid paraffin 2 parts); Pulvis Talci 2 parts, 2,6-tri-grades of butyl-4-methylphenols 1 part.
The preparation method that flame-retardant expanded composite moulded by above-mentioned vermiculite power modified polypropene wood is as follows:
(1) material pretreatment: take required quality Poplar Powder, it is soaked in equipped with in the vessel that mass fraction is 5%NaOH solution under room temperature, wood powder tap water basification crossed after 24h is to neutral, being dried to moisture content in air dry oven under 105 DEG C of conditions is about 3%, and powder process is standby; Unclassified stores is placed in air dry oven 80 DEG C dry 12h.
(2) dispensing: successively the raw material such as Poplar Powder after pretreatment, polypropylene (PP), compatilizer, coupling agent, modified AC foaming agent, fire retardant, foaming control agent, lubricant, Pulvis Talci, antioxidant is undertaken weighing standby by required quality.
(3) wood powder, polypropylene, processing aid high speed premix: each material being placed in high-speed mixer high speed and is mixed and made into premix material, dry for standby, the rotating speed of described mixed at high speed is 1100 revs/min, and incorporation time is 5min.
(4) prepared by polypropylene flame redardant Wood-plastic foam composite master batch: preparation premix material is added in double screw extruder and melt extrudes, extruded stock is cooled, pelletize obtains polypropylene flame redardant Wood-plastic foam composite master batch, and the temperature in each district of described double screw extruder is T1=190 DEG C, T2=195 DEG C, T3=195 DEG C, T4=195 DEG C, TMould=200 DEG C, extruded velocity 0.6m/min.
(5) preparation of polypropylene flame redardant Wood-plastic foaming composite board material: being added in injector by polypropylene flame redardant Wood-plastic foam composite master batch, injector processing and forming temperature is 195 DEG C, uses corresponding mould to prepare the sheet material of required form.
The stone powder modified polypropene wood that the present invention prepares is moulded the microstructure of flame-retardant expanded composite and is seen Fig. 1 and Fig. 2, from Fig. 1～2 it can be seen that the aperture of composite is less and cell size is comparatively uniform. The vermiculite power modified polypropene wood that embodiment 3,4,7 is prepared is moulded flame-retardant expanded composite and is carried out thermodynamic property test, result is shown in Fig. 3～4, from Fig. 3～4 it can be seen that adopt inorganic vermiculite powder can partly substitute wood powder, it is possible to be effectively improved heat insulation, fire resistance.
Flame-retardant expanded composite quantitative measurement moulded by the vermiculite power modified polypropene wood that embodiment 1～7 is prepared, and test result is shown in table 1 below. the result of table 1 describes: wood powder carries out alkalization pretreatment, adds coupling agent, compatilizer etc. and can significantly improve the wood fiber and polyacrylic interface compatibility, add appropriate inorganic vermiculite powder and can improve bending property and the impact property of wood plastic composite, and vermiculite power has excellent heat stability and dimensional stability, also there is the properties such as heat insulation, fire-retardant, sound absorption, high abrasion simultaneously, vermiculite power is less than wood powder density and inexpensive as inorganic filler, for reduce further density and the water absorption rate of composite in wood plastic composite, can also improve fire resistance and the friction resistant ability of composite simultaneously, the present invention is also by adding modified AC foaming agent, polyacrylate foaming control agent etc., optimize foaming effect and the melt strength of composite, strengthen Stress Transfer, the mechanical performance and the processing characteristics that make composite are strengthened, preparation-obtained wood plastic composite has good foam structure (see Fig. 1 and Fig. 2), crack tip can be passivated, stop the extension of crackle, thus it is big efficiently against common wood-plastic composite fragility, ductility and the low shortcoming of shock resistance stress, and reduce the density of material, not only conservation, and sound insulation, heat-proof quality is also better, there is more accurate apparent size, surface property is more outstanding, and have more woodiness touch.
The quantitative measurement result of flame-retardant expanded composite moulded by table 1 vermiculite power modified polypropene wood
| Embodiment | 1 | 2 | 3 | 4 | 5 | 6 | 7 |
| Average pore size (μm) | 41 | 35 | 32 | 27 | 33 | 30 | 24 |
| The concordance of cell size | Poor | Well | Outstanding | Outstanding | Well | Well | Outstanding |
| Panel density (g cm-3) | 1.29 | 1.21 | 1.18 | 1.17 | 1.07 | 1.03 | 1.16 |
| Fusion time (s) | 28.6 | 27.8 | 26.5 | 25.9 | 26.1. | 26.9 | 26.2 |
| Peak torque (N m) | 45.5 | 40.3 | 34.9 | 35.2 | 36.0 | 36.7 | 35.8 |
| Hot strength (MPa) | 25.3 | 29.7 | 36.8 | 35.6 | 33.9 | 31.2 | 37.7 |
| Impact strength (KJ/m2) | 14.3 | 15.2 | 16.0 | 15.8 | 16.2 | 15.3 | 16.4 |
| Bending strength (MPa) | 30.3 | 32.2 | 34.7 | 34.3 | 35.2 | 36.5 | 34.8 |
| Limited oxygen index LOI (%) | 30.1 | 30.9 | 35.3 | 34.2 | 34.5 | 34.7 | 33.6 |
Obviously, above-described embodiment is only for clearly demonstrating the example made, and is not the restriction to embodiment. For those of ordinary skill in the field, can also make other changes in different forms on the basis of the above description. Here without also cannot all of embodiment be given exhaustive. And the apparent change therefore amplified or variation are still within the protection domain of the invention.
Claims (9)
1. the preparation method that flame-retardant expanded composite moulded by a vermiculite power modified polypropene wood, it is characterised in that comprise the steps:
(1) wood powder alkalization pretreatment: be at room temperature soaked in by Poplar Powder in NaOH solution and carry out alkalization pretreatment, is washed to neutrality, dried subsequently, and the Poplar Powder obtained is standby;
(2) each raw material components is calculated by weight as: step (1) gained Poplar Powder 20 ~ 40 parts, vermiculite power 10 ~ 20 parts, polypropylene 50 ~ 70 parts, compatilizer 5 ~ 10 parts, coupling agent 2 ~ 3 parts, modified AC foaming agent 1 ~ 2 part, fire retardant 10 ~ 15 parts, foaming control agent 3 ~ 5 parts, lubricant 3 parts, Pulvis Talci 2 parts, 1 part of antioxidant, each raw material components is placed in high-speed mixer high speed and is mixed and made into premix material;
(3) preparation of polypropylene flame redardant Wood-plastic foam composite master batch: step (2) gained premix material is added in double screw extruder and melt extrudes, extruded stock is cooled, obtain polypropylene flame redardant Wood-plastic foam composite master batch after pelletize;
(4) preparation of polypropylene flame redardant Wood-plastic foam composite: added in injector by polypropylene flame redardant Wood-plastic foam composite master batch, uses the vermiculite power modified polypropene wood that required form prepared by corresponding mould to mould flame-retardant expanded composite.
2. preparation method according to claim 1, it is characterised in that the mass concentration of step (1) described NaOH solution is 5%, the time of alkalization pretreatment is 24h.
3. preparation method according to claim 1, it is characterised in that step (2) described compatilizer is maleic anhydride inoculated polypropylene; Described coupling agent is Silane coupling agent KH550; Described fire retardant is fire retardant FR 8000; Described lubricant is stearic acid and liquid paraffin; Described antioxidant is 2,6-tri-grades of butyl-4-methylphenols.
4. preparation method according to claim 1, it is characterised in that the modifying agent of the described modified AC foaming agent of step (2) is zinc oxide, described modified AC foaming agent is to be mixed with obtained by modifying agent zinc oxide and AC foaming agent.
5. preparation method according to claim 1, it is characterized in that, step (2) described foaming control agent is cinnamic acrylic ester based terpolymers, is prepared by multi-step emulsion polymerizations reaction by methyl methacrylate, butyl acrylate and styrene monomer.
6. preparation method according to claim 1, it is characterised in that the rotating speed of step (2) described mixed at high speed is 900 ~ 1100 revs/min, incorporation time is 5min.
7. preparation method according to claim 1, it is characterised in that the temperature in each district of step (3) described double screw extruder is T1=190 DEG C, T2=195 DEG C, T3=195 DEG C, T4=195 DEG C, TMould=200 DEG C, extruded velocity 0.6m/min.
8. preparation method according to claim 1, it is characterised in that the processing and forming temperature of step (4) described injector is 185 ~ 195 DEG C.
9. flame-retardant expanded composite moulded by the vermiculite power modified polypropene wood that the arbitrary described preparation method of claim 1 ~ 8 prepares.
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| CN106084505A (en) * | 2016-08-27 | 2016-11-09 | 冯可发 | A kind of novel stone wood plastic composite |
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| CN110524983A (en) * | 2019-07-24 | 2019-12-03 | 宣城福美达新材料有限公司 | A kind of environment-friendly type wood-plastic composite floor and its production method |
| CN111909534A (en) * | 2020-08-12 | 2020-11-10 | 无锡啄木鸟环保建材有限公司 | Preparation method of sound-insulation noise-reduction light foaming type wood-plastic board |
| CN111909534B (en) * | 2020-08-12 | 2022-02-25 | 无锡啄木鸟环保建材有限公司 | Preparation method of sound-insulation noise-reduction light foaming type wood-plastic board |
| CN113354874A (en) * | 2021-06-10 | 2021-09-07 | 湖北工程学院 | Preparation method of composite additive, wood-plastic board and preparation method thereof |
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