CN105644074A - High strength wood-plastic coated coextruded composite material and preparation method thereof - Google Patents
High strength wood-plastic coated coextruded composite material and preparation method thereof Download PDFInfo
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Abstract
The invention provides a high strength wood-plastic coated coextruded composite material. The material is composed of a core layer and a coating layer. The coating layer coats the surface of the core layer through a co-extrusion technology, biomass powder in the core layer is improved to a biomass fiber material, because of a large length-diameter ratio, the biomass fiber material not only plays a "filling" role in a wood-plastic composite material, but also plays a "reinforcing" role, greatly improves the mechanical properties of the composite material, especially improves the impact resistance, creep resistance and other properties, thereby broadening the application scope of the wood-plastic composite material. In addition, the coating layer involved in the invention preferably contains ethylene-methyl acrylate copolymer resin, ethylene-vinyl alcohol copolymer resin and high strength fiber, thus being conducive to further enhancing the mechanical properties of the composite material and the binding force with the core layer.
Description
Technical field
The invention belongs to wood plastic composite technical field, it is specifically related to a kind of coated coextru-lamination material of high-intensity wood plastic and its preparation method.
Background technology
Wood plastic composite is taking agricultural-forestry biomass resource as main raw material, by the pre-treatment such as Mechanical Crushing, chemical modification, with a certain proportion of thermoplastic polymer in mixing facilities through melting, mixing, then through extruding, shape, a kind of advanced composite material of the technological forming such as cooling. What wood plastic composite combined the renewable of biomass resource and macromolecular material can machine-shaping feature, while making full use of abandoned biomass, can reduce again the usage quantity of non-degradable petroleum-based plastics, it is a kind of have development prospect " low carbon, green, capable of circulation " material. As a kind of novel matrix material; wood plastic composite is except having the significance in environment protection and the utilization of resources; its advantage also shows to have good over-all properties and the market competitiveness, as having the features such as good mechanical property, mechanical workout characteristic, environmental adaptability, surface property. At present, wood plastic composite, because having a lot of significantly advantage, has been widely used in multiple fields such as building, furniture, vehicle, packaging, transport, and development prospect is very wide, is one of demand growth is the fastest in all matrix materials in recent years product.
But, the place that wood plastic composite also comes with some shortcomings, as undesirable in performances such as low temperature wear-resisting, resistance to, shock resistance, uvioresistant, creep resistances. general dirt wear-resisting, anti-, the uvioresistant performance adopting coated co-extrusion technology to improve wood plastic composite material sections, namely has functional coating layer coated one layer of its core layer surface in Wood-plastic profiles extrusion moulding process at present. publication number is CN102757592A, CN103788555A, CN103240940A patent document discloses more relevant coated co-extrusion Wood-plastic profiles and its preparation methods, but core layer involved in above-mentioned patent documentation all selects biomass powder as raw material, Wood-plastic profiles is only played " filling " effect by it, and without " enhancing " effect, therefore to mould the mechanical property of coated co-extrusion section bar poor for wood, especially the performance such as shock resistance and creep resistance is not still further improved, by greatly limit, the strength of materials is had the range of application in the engineering field of particular requirement at some by wood plastic composite for this, in addition, coating layer involved in above-mentioned patent documentation take polymkeric substance as main component, its performance such as creep resistance and shock resistance, and and coating layer between bonding force still need to be improved further.
Summary of the invention
Mould the state of the art of coated coextru-lamination material for above-mentioned wood, it is desirable to provide a kind of coated coextru-lamination material of high-intensity wood plastic, it has the performances such as high strength, shock resistance, creep resistance.
The present invention realizes the technical scheme that above-mentioned technical purpose adopts: a kind of coated coextru-lamination material of high-intensity wood plastic, it is made up of core layer and coating layer, described coating layer is coated on core layer surface by coextrusion process, and described core layer comprises biological material and plastics; It is characterized in that: described biological material is xylon or bamboo fibers, its length is 0.1mm��4.0mm, and diameter is 10 ��m��100 ��m.
The preparation method of described biomass fiber does not limit, it is possible to be by the wood of small diameter grade, bamboo resource through the art breading such as steam explosion or defibrator process the obtained biomass fiber with certain length-to-diameter ratio, as preferably, its length-to-diameter ratio is 10:1��100:1.
As preferably, described core layer is made up of biomass fiber, recycled plastic, coupling agent, lubricant, and its mass percentage content is respectively: biomass fiber is 50%��65%, recycled plastic is 30%��40%, coupling agent is 2%��10%, lubricant is 1%��5%.
Described recycled plastic is one or both in Low Density Polyethylene, high density polyethylene(HDPE).
Described coupling agent is one or more the mixing in maleic anhydride, maleic anhydride grafted polyethylene, maleic anhydride-ethylene copolymer, silane coupling agent, aluminic acid ester, titanic acid ester etc.
Described lubricant is one or more mixing in paraffin, polyethylene wax, stearic acid, stearate, ethylene bis stearamide etc.
As preferably, described coating layer is made up of polyethylene, polypropylene, ethylene-methyl acrylate copolymer, ethylene-vinyl alcohol copolymer, high strength fibre, mineral filler, anti UV agent, look mother, and its mass percentage is respectively: polyethylene is 20%��60%, polypropylene is 5%��40%, ethylene-methyl acrylate copolymer is 10%��40%, ethylene-vinyl alcohol copolymer is 5%��25%, high strength fibre is 5%��30%, mineral filler is 2%��10%, anti UV agent is 0.1%��0.8%, look mother is 0.2%��0.8%.
Described polyethylene is preferably high density polyethylene(HDPE).
Described high-intensity fiber is one or more the mixing material in glass fibre, flaxen fiber, carbon fiber, nylon fiber, superhigh molecular weight polyethylene fibers, polyimide fiber, aramid fiber, ceramic fiber, boron fibre, steel fiber etc.
Described mineral filler is one or more the mixing material in calcium carbonate, talcum powder, white carbon black, clay, polynite, mica etc.
Described anti UV agent is one or more the mixing material in salicylate class, benzophenone class, benzotriazole category etc.
As preferably, described coating thickness is 0.2mm��2.0mm.
Present invention also offers a kind of method preparing the coated coextru-lamination material of above-mentioned high-intensity wood plastic, comprise the steps:
(1) core layer material is added in high-speed mixer, add after mixing parallel double-screw extruder carries out mixing, extrude, granulation, cooling, obtain core layer material particle;
(2) coating layer material is added in high-speed mixer, add after mixing parallel double-screw extruder carries out mixing, extrude, granulation, cooling, obtain coating layer material particle;
(3) adding in twin screw extruder by core layer material particle, under temperature is 175��185 DEG C of conditions, melting is extruded in co-extruding mould runner; Adding in twin screw extruder by coating layer material particle, under temperature is 170��180 DEG C of conditions, melting is extruded in co-extruding mould runner; Core layer material and coated material after melting converge in double-layer coextrusion mould, make coating layer be coated on core layer surface, then enter in stock mould and shape, and finally enter in cooling trough and cool.
As preferably, in described step (1), core layer material, in high-speed mixer, mixes 10��30min at temperature 100��110 DEG C.
As preferably, in described step (1), core layer material adds parallel double-screw extruder after mixing, carry out under temperature 150��170 DEG C, rotating speed 60��90r/min mixing, extrude, granulation, cooling, obtain core layer material particle.
As preferably, in described step (2), coating layer material, in high-speed mixer, mixes 10��30min at temperature 60��80 DEG C.
As preferably, in described step (2), coating layer material adds parallel double-screw extruder after mixing, carry out when temperature 170��190 DEG C, rotating speed 60��90r/min mixing, extrude, granulation, cooling, obtain coating layer material particle.
As preferably, in described step (3), core layer particle adds in conical double screw extruder, when temperature 175��185 DEG C, rotating speed 70��80r/min, melting is extruded.
As preferably, in described step (3), coating layer particle adds in parallel double-screw extruder, when temperature 170��180 DEG C, rotating speed 70��80r/min, melting is extruded.
As preferably, the obtained wood of described step (3) mould coated coextru-lamination material on request length cut, then carry out embossing process, coated co-extruded composite section finished product moulded by obtained wood.
Compared with prior art, tool of the present invention has the following advantages:
(1) the biomass powder in core layer is improved to biomass fiber material, owing to the length-to-diameter ratio of biomass fiber material is bigger, not only wood plastic sectional matrix material is played " filling " effect, and play " enhancing " effect, substantially increase the mechanical property of matrix material, especially improve its performance such as shock resistance and creep resistance, thus widen the range of application of wood plastic sectional matrix material;
(2) in order to improve the mechanical property of matrix material further, coating layer preferably includes ethylene-methyl acrylate copolymer and ethylene-vinyl alcohol copolymer resin, also includes the high strength fibres such as glass fibre, flaxen fiber, carbon fiber; Wherein, ethylene-methyl acrylate copolymer and ethylene-vinyl alcohol copolymer both can improve the barrier of composite material surface, wear resistance, anti-scratch colored property, also can improve the bonding force between core layer and coating layer, reduce the risk that comes off of coating layer, thus add the work-ing life of product; High strength fibre contributes to promoting further the performance such as creep resistance and shock resistance of matrix material.
Accompanying drawing explanation
Fig. 1 is the schematic cross-section that coated co-extrusion section bar moulded by the wood in the embodiment of the present invention 1;
Fig. 2 is the schematic cross-section that coated co-extrusion section bar moulded by the wood in the embodiment of the present invention 2.
Embodiment
Below in conjunction with accompanying drawing embodiment, the present invention is described in further detail, it should be noted that, the following stated embodiment is intended to be convenient to the understanding of the present invention, and it does not play any restriction effect.
Embodiment 1:
In the present embodiment, wood is moulded coated co-extrusion section bar and is square upright post type, and its schematic cross-section is as shown in Figure 1. This wood is moulded coated co-extrusion section bar and is made up of coating layer and core layer, and coating layer is coated on core layer surface by coextrusion process.
By mass percentage, described core layer is made up of following component:
Xylon 55%, and the length of described xylon is 0.1��4.0mm, and length-to-diameter ratio is 10:1��100:1
Recycle polyethylene 40%
Coupling agent-maleic anhydride grafted polyethylene 2%
Mineral filler-calcium carbonate 2%
Lubricant-polyethylene wax 1%.
By mass percentage, described coating layer is made up of following component:
High density polyethylene(HDPE) 40%
Polypropylene 10%
Ethylene-methyl acrylate copolymer 20%
Ethylene-vinyl alcohol copolymer 17%
High strength fibre-glass fibre 10%
Mineral filler-calcium carbonate 2%
Anti UV agent-benzophenone class 0.5%
Look mother 0.5%.
The preparation method that coated co-extrusion section bar moulded by above-mentioned wood comprises the steps:
(1) wood fibre, recycle polyethylene, coupling agent, lubricant, mineral filler are added in high-speed mixer by above-mentioned each constituent mass percentage ratio, at temperature 105 DEG C, mix 10min; Then being added in the parallel double-screw extruder of length-to-diameter ratio 50:1 by the material mixed, setting forcing machine processing temperature is 165 DEG C, screw speed is 70r/min, extrudes, granulation, obtained core layer material particle;
(2) high density polyethylene(HDPE), polypropylene, ethylene-methyl acrylate copolymer, ethylene-vinyl alcohol copolymer, high strength fibre, mineral filler, anti UV agent, look mother are added in high-speed mixer by above-mentioned each constituent mass percentage ratio, at temperature 70 DEG C, mix 20min; Then being added in the parallel double-screw extruder of length-to-diameter ratio 50:1 by the material mixed, setting forcing machine processing temperature is 170 DEG C, screw speed is 70r/min, extrudes, granulation, obtains coating layer material particle.
(3) being added in conical double screw extruder by core layer material particle, setting forcing machine processing temperature is 170 DEG C, screw speed is 80r/min, and material is delivered in co-extruding mould runner after plasticizing; Meanwhile, being added in parallel double-screw extruder by coating layer particle, setting forcing machine processing temperature is 180 DEG C, screw speed is 40r/min, and material is also delivered in co-extruding mould runner after melting, plasticizing; Coated material melt and core layer material converge in double-layer coextrusion mould, and wherein coated material melt composition thin film is coated on the outside surface of core layer, then through techniques such as sizing, cooling, cutting, embossing, and the obtained square column Wood-plastic profiles with coating layer.
Obtained carrying out Mechanics Performance Testing with the square column Wood-plastic profiles of coating layer to above-mentioned, test result is as shown in table 1 below.
The mechanical property of the square column of coated co-extrusion section bar moulded by the obtained wood of table 1 embodiment 1
Embodiment 2:
In the present embodiment, coated co-extrusion section bar moulded by wood is solid floor, and its schematic cross-section is as shown in Figure 2. This is moulded coated co-extrusion section bar and is made up of coating layer and core layer, and coating layer is coated on core layer surface by coextrusion process.
By mass percentage, described core layer is made up of following component:
Bamboo fibers 50%, and the length of described bamboo fibers is 0.1��4.0mm, and length-to-diameter ratio is about 10:1��100:1
Recycle polyethylene 45%
Coupling agent-titanic acid ester 1.8%
Mineral filler-talcum powder 2.2%
Lubricant-form 1% by the polyethylene wax of the stearic acid of 40% quality and 60% quality.
By mass percentage, described coating layer is made up of following component:
High density polyethylene(HDPE) 55%
Polypropylene 7.5%
Ethylene-methyl acrylate copolymer 15.5%
Ethylene-vinyl alcohol copolymer 10%
High strength fibre-sisal hemp 11%
Anti UV agent-salicylate class 0.7%
Look mother 0.3%.
The preparation method that coated co-extrusion section bar moulded by above-mentioned wood comprises the steps:
(1) bamboo fibers, recycle polyethylene, coupling agent, lubricant, mineral filler are added in high-speed mixer by above-mentioned each constituent mass percentage ratio, at temperature 100 DEG C, mix 20min; Then being added in the parallel double-screw extruder of length-to-diameter ratio 50:1 by the material mixed, setting forcing machine processing temperature is 170 DEG C, screw speed is 65r/min, extrudes, granulation, obtained core layer material particle.
(2) high density polyethylene(HDPE), polypropylene, ethylene-methyl acrylate copolymer, ethylene-vinyl alcohol copolymer, high strength fibre anti ultraviolet agent, look mother are added in high-speed mixer by above-mentioned each constituent mass percentage ratio, at temperature 65 DEG C, mix 25min; Then being added in the parallel double-screw extruder of length-to-diameter ratio 50:1 by the material mixed, setting forcing machine processing temperature is 175 DEG C, screw speed is 65r/min, extrudes, granulation, obtains coating layer material particle.
(3) being added in conical double screw extruder by core layer material particle, setting forcing machine processing temperature is 170 DEG C, screw speed is 70r/min, and material is delivered in co-extruding mould runner after plasticizing; Meanwhile, being added in parallel double-screw extruder by coating layer particle, setting forcing machine processing temperature is 175 DEG C, screw speed is 35r/min, and material is also delivered in co-extruding mould runner after melting, plasticizing; Coated material melt and core layer material converge in double-layer coextrusion mould, and wherein coated material melt composition thin film is coated on the outside surface of core layer, then through techniques such as sizing, cooling, cutting, embossing, and the obtained solid floor Wood-plastic profiles with coating layer.
Obtained carrying out Mechanics Performance Testing with the square column Wood-plastic profiles of coating layer to above-mentioned, test result is as shown in table 2 below.
The mechanical property of coated co-extrusion section bar solid floor moulded by the obtained wood of table 2 embodiment 2
The technical scheme of the present invention has been described in detail by above-described embodiment; it it should be understood that and the foregoing is only specific embodiments of the invention; it is not limited to the present invention; all any amendments and improvement etc. made in the spirit of the present invention, all should be included within protection scope of the present invention.
Claims (10)
1. the coated coextru-lamination material of high-intensity wood plastic, is made up of core layer and coating layer, and described coating layer is coated on core layer surface by coextrusion process, and described core layer comprises biological material and plastics; It is characterized in that: described biological material is xylon or bamboo fibers, its length is 0.1mm��4.0mm, and diameter is 10 ��m��100 ��m.
2. the coated coextru-lamination material of high-intensity wood plastic as claimed in claim 1, is characterized in that: described xylon or the length-to-diameter ratio of bamboo fibers are 10:1��100:1.
3. the coated coextru-lamination material of high-intensity wood plastic as claimed in claim 1, is characterized in that: described core layer is made up of xylon or bamboo fibers, recycled plastic, coupling agent, lubricant, and its mass percentage content is respectively:
Xylon or bamboo fibers 50%��65%
Recycled plastic 30%��40%
Coupling agent 2%��10%
Lubricant 1%��5%.
4. the coated coextru-lamination material of high-intensity wood plastic as claimed in claim 3, is characterized in that: described recycled plastic is one or both in Low Density Polyethylene, high density polyethylene(HDPE).
5. the coated coextru-lamination material of high-intensity wood plastic as claimed in claim 3, is characterized in that: described coupling agent is one or more the mixing in maleic anhydride, maleic anhydride grafted polyethylene, maleic anhydride-ethylene copolymer, silane coupling agent, aluminic acid ester, titanic acid ester.
6. the coated coextru-lamination material of high-intensity wood plastic as claimed in claim 3, is characterized in that: described lubricant is one or more mixing in paraffin, polyethylene wax, stearic acid, stearate, ethylene bis stearamide.
7. the coated coextru-lamination material of high-intensity wood plastic as claimed in claim 1, it is characterized in that: described coating layer is made up of polyethylene, polypropylene, ethylene-methyl acrylate copolymer, ethylene-vinyl alcohol copolymer, high strength fibre, mineral filler, anti UV agent, look mother, and its mass percentage is as follows:
Polyethylene 20%��60%
Polypropylene 5%��40%
Ethylene-methyl acrylate copolymer 10%��40%
Ethylene-vinyl alcohol copolymer 5%��25%
High strength fibre 5%��30%
Mineral filler 2%��10%
Anti UV agent 0.1%��0.8%
Look mother 0.2%��0.8%
Described high-intensity fiber is one or more the mixing material in glass fibre, flaxen fiber, carbon fiber, nylon fiber, superhigh molecular weight polyethylene fibers, polyimide fiber, aramid fiber, ceramic fiber, boron fibre, steel fiber.
8. the coated coextru-lamination material of high-intensity wood plastic as claimed in claim 7, is characterized in that: described mineral filler is one or more the mixing material in calcium carbonate, talcum powder, white carbon black, clay, polynite, mica; As preferably, described anti UV agent is one or more the mixing material in salicylate class, benzophenone class, benzotriazole category.
9. the coated coextru-lamination material of high-intensity wood plastic as claimed in claim 1, is characterized in that: described coating thickness is 0.2mm��2.0mm.
10. preparation is such as the method for the coated coextru-lamination material of high-intensity wood plastic as described in any claim in claim 1 to 9, it is characterized in that: comprise the steps:
(1) core layer material is added in high-speed mixer, add after mixing parallel double-screw extruder carries out mixing, extrude, granulation, cooling, obtain core layer material particle;
As preferably, core layer material adds parallel double-screw extruder after mixing, carry out under temperature 150��170 DEG C, rotating speed 60��90r/min mixing, extrude, granulation, cooling, obtain core layer material particle;
(2) coating layer material is added in high-speed mixer, add after mixing parallel double-screw extruder carries out mixing, extrude, granulation, cooling, obtain coating layer material particle;
As preferably, coating layer material adds parallel double-screw extruder after mixing, carry out when temperature 170��190 DEG C, rotating speed 60��90r/min mixing, extrude, granulation, cooling, obtain coating layer material particle;
(3) adding in twin screw extruder by core layer material particle, under temperature is 175��185 DEG C of conditions, melting is extruded in co-extruding mould runner; Adding in twin screw extruder by coating layer material particle, under temperature is 170��180 DEG C of conditions, melting is extruded in co-extruding mould runner; Core layer material and coated material after melting converge in double-layer coextrusion mould, make coating layer be coated on core layer surface, then enter in stock mould and shape, and finally enter in cooling trough and cool;
As preferably, core layer particle adds in conical double screw extruder, when temperature 175��185 DEG C, rotating speed 70��80r/min, melting is extruded; Coating layer particle is added in parallel double-screw extruder, and when temperature 170��180 DEG C, rotating speed 70��80r/min, melting is extruded.
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