CN104530739A - Thermotropic high-polymer liquid crystal reinforced/toughened polyolefin-base wood-plastic composite material and preparation method thereof - Google Patents
Thermotropic high-polymer liquid crystal reinforced/toughened polyolefin-base wood-plastic composite material and preparation method thereof Download PDFInfo
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Abstract
The invention relates to a wood-plastic composite material and a preparation method thereof, particularly a thermotropic high-polymer liquid crystal reinforced/toughened polyolefin-base wood-plastic composite material and a preparation method thereof. The invention aims to solve the problem that reinforcement and toughening modification can not be performed at the same time in the existing wood-plastic composite material mechanics. The wood-plastic composite material is prepared from polyolefin, plant fiber powder, a compatilizer, a lubricant and thermotropic liquid crystals. The preparation method comprises the following steps: evenly mixing the polyolefin, compatilizer and thermotropic liquid crystal, granulating with an extruder to obtain a liquid crystal reinforced polyolefin composite material; evenly mixing the plant fiber powder, lubricant and liquid crystal reinforced polyolefin composite material in a high-speed mixer, granulating with an extruder to obtain wood-plastic granules, and finally, carrying out contour machining on the wood-plastic granules to obtain the thermotropic high-polymer liquid crystal reinforced/toughened polyolefin-base wood-plastic composite material. The method is mainly used for preparing the thermotropic high-polymer liquid crystal reinforced/toughened polyolefin-base wood-plastic composite material.
Description
Technical field
The present invention relates to wood plastic composite and preparation method thereof.
Background technology
Vegetable fibre etc. adds in thermoplastics as filler or strongthener by wood plastic composite (WPC), and a kind of Novel environment-friendlymaterial material making the thermoplastics of vegetable fibre and molten state carry out compound by heating and obtain.There is following characteristics: (1) raw material sources are wide, low price; (2) good stability of the dimension, moisture absorption and water absorbing properties lower; (3) resistance toheat is better; (4) good corrosion resistance; (5) processing and recycle can be repeated.As a kind of type material, Application Areas comprises building, logistics, decoration, furniture, gardens etc.; As Structure type material, be mainly used in indoor floor, furniture and door and window; As decorative kind material, be mainly used in automotive trim and interior decoration accessory; In addition, also may be used for occasion environment being had to particular requirement.The development of wood plastic composite, is not only conducive to protecting forest resources, and can also solve the plastics de-referencing problem be on the rise in city, is conducive to society and economic Sustainable development.
Wood-plastic products is composited by hydrophilic plant fiber and hydrophobic plastic, in use there is the problem that mechanical strength is low and toughness is low.For the requirement of mechanical property in Material Field uses moulded by satisfied wood, mechanical property modification can be carried out: (1) adds fiber, rigid particles strengthens, but the dispersion in the composite of fiber and rigid particles and weak interface layer are the subject matter limiting its application, cost is higher in addition; (2) resin matrix selecting intensity higher, mechanical strength of resin height can along with fusing point and viscosity higher, cause processing difficulties; (3) foaming modification is carried out to wood plastic composite, the toughness of material can be improved, but the decline of rigidity and intensity can be caused; (4) add coupling agent, improve the interface compatibility between vegetable fibre and plastics by covalent linkage or Intermolecular Forces, thus reach the object improving material mechanical performance.But at present wood plastic composite mechanics modification exists the single problem of Application Areas, be that enhancing modified or toughening modifying all can along with another property loss of energies.Therefore, how accomplishing to mould the modification object of carrying out activeness and quietness to wood, is that industry problem demanding prompt solution moulded by wood.
Summary of the invention
The present invention will solve the problem that existing wood plastic composite mechanics cannot carry out activeness and quietness modification simultaneously, and provides polyolefin-based wood plastic composite of a kind of thermotropic high molecule liquid crystal activeness and quietness and preparation method thereof.
The polyolefin-based wood plastic composite of a kind of thermotropic high molecule liquid crystal activeness and quietness of the present invention is prepared from by 20 parts ~ 100 parts polyolefine, 30 parts ~ 200 parts vegetable fibre powders, 2 parts ~ 8 parts compatilizers, 1 part ~ 5 parts lubricants and 0.1 part ~ 5 parts thermotropic liquid crystals by mass fraction.
The preparation method of the polyolefin-based wood plastic composite of a kind of thermotropic high molecule liquid crystal activeness and quietness of the present invention carries out according to the following steps:
One, take: take 20 parts ~ 100 parts polyolefine, 30 parts ~ 200 parts vegetable fibre powders, 2 parts ~ 8 parts compatilizers, 1 part ~ 5 parts lubricants and 0.1 part ~ 5 parts thermotropic liquid crystals by mass fraction;
Two, 20 parts that step one are taken ~ 100 parts polyolefine, 2 parts ~ 8 parts compatilizers and 0.1 part ~ 5 parts thermotropic liquid crystals mix, obtain mixture A, mixture A forcing machine is carried out granulation, and prilling temperature is 170 DEG C ~ 250 DEG C, obtains liquid crystal and strengthens composite polyolefine material;
Three, 30 parts that step one are taken ~ 200 parts vegetable fibre powder, 1 part ~ 5 parts lubricants and liquid crystal enhancing composite polyolefine materials are even in high-speed mixer and mixing, obtain mixture B, then mixture B is carried out granulation by forcing machine, prilling temperature is 145 DEG C ~ 220 DEG C, obtains wood and moulds pellet;
Four, wood is moulded pellet and carry out forming process, namely obtain the polyolefin-based wood plastic composite of thermotropic high molecule liquid crystal activeness and quietness.
The invention has the beneficial effects as follows: the polyolefin-based wood plastic composite outstanding feature of thermotropic high molecule liquid crystal activeness and quietness prepared by the present invention is, by thermotropic liquid crystal higher for fusing point and TPO under the existence of compatilizer, melt blending is passed through at the temperature of coupling, under the effect of temperature and shearing force, form fento oriented structure, be present in polyolefin resin matrix with disperse phase, solve other wild phases and disperse uneven problem as fiber, nanoparticle are moulded in matrix at wood, under stress, thermotropic liquid crystal as disperse phase can cause crazing and shear zone, the stress concentration of Near A Crack Tip is relaxed, hinder the expansion of crackle, system consumes large energy, and the vegetable fibre that wild phase moulded by liquid crystal fine fibrilation and wood can play the collaborative effect strengthening polyolefin resin matrix, the intensity that the while of reaching, remarkable improvement wood is moulded and the effect of toughness, so wood prepared by the present invention moulds its intensity and toughness not only far above Traditional Wood moulding material, and performance is far above the thermotropic high molecule liquid crystal activeness and quietness composite polyolefine material do not added prepared by vegetable fibre powder, in addition thermotropic liquid crystal is moulded in matrix at wood and is uniformly dispersed, improve wooden rheological behaviour of moulding in the course of processing, and consumption is less, cost is lower, achieve and reach the object of wood being moulded to modification by modified resin matrix, WPC actual production research is had great importance.
The polyolefin-based wood plastic composite of thermotropic high molecule liquid crystal activeness and quietness prepared by the present invention, tensile strength improves 10% ~ 40%, flexural strength improves 20% ~ 40%, and shock strength improves 30-60%, makes wood plastic composite mechanics carry out activeness and quietness modification simultaneously.
The present invention is used for polyolefin-based wood plastic composite of a kind of thermotropic high molecule liquid crystal activeness and quietness and preparation method thereof.
Embodiment
Embodiment one: the polyolefin-based wood plastic composite of a kind of thermotropic high molecule liquid crystal activeness and quietness of present embodiment, the polyolefin-based wood plastic composite of a kind of thermotropic high molecule liquid crystal activeness and quietness is prepared from by 20 parts ~ 100 parts polyolefine, 30 parts ~ 200 parts vegetable fibre powders, 2 parts ~ 8 parts compatilizers, 1 part ~ 5 parts lubricants and 0.1 part ~ 5 parts thermotropic liquid crystals by mass fraction.
The beneficial effect of present embodiment is: the polyolefin-based wood plastic composite outstanding feature of thermotropic high molecule liquid crystal activeness and quietness prepared by present embodiment is, by thermotropic liquid crystal higher for fusing point and TPO under the existence of compatilizer, melt blending is passed through at the temperature of coupling, under the effect of temperature and shearing force, form fento oriented structure, be present in polyolefin resin matrix with disperse phase, solve other wild phases and disperse uneven problem as fiber, nanoparticle are moulded in matrix at wood, under stress, thermotropic liquid crystal as disperse phase can cause crazing and shear zone, the stress concentration of Near A Crack Tip is relaxed, hinder the expansion of crackle, system consumes large energy, and the vegetable fibre that wild phase moulded by liquid crystal fine fibrilation and wood can play the collaborative effect strengthening polyolefin resin matrix, the intensity that the while of reaching, remarkable improvement wood is moulded and the effect of toughness, so wood prepared by the present invention moulds its intensity and toughness not only far above Traditional Wood moulding material, and performance is far above the thermotropic high molecule liquid crystal activeness and quietness composite polyolefine material do not added prepared by vegetable fibre powder, in addition thermotropic liquid crystal is moulded in matrix at wood and is uniformly dispersed, improve wooden rheological behaviour of moulding in the course of processing, and consumption is less, cost is lower, achieve and reach the object of wood being moulded to modification by modified resin matrix, WPC actual production research is had great importance.
The polyolefin-based wood plastic composite of thermotropic high molecule liquid crystal activeness and quietness prepared by present embodiment, tensile strength improves 10% ~ 40%, flexural strength improves 20% ~ 40%, and shock strength improves 30-60%, makes wood plastic composite mechanics carry out activeness and quietness modification simultaneously.
Embodiment two: present embodiment and embodiment one unlike: described polyolefine is a kind of or wherein several mixture in polyethylene, polypropylene, polyvinyl chloride and polystyrene; Described compatilizer is a kind of or wherein several mixture in the polyethylene of maleic anhydride graft, the polypropylene of maleic anhydride graft, titanic acid ester, isocyanide ester, aminosilane, vinyl silanes and methacryloxypropyl silane.Other is identical with embodiment one.
Embodiment three: one of present embodiment and embodiment one or two are that the Xydar series liquid crystal of P-hydroxybenzoic acid '-biphenyl diphenol terephthaldehyde acid copolymer, P-hydroxybenzoic acid are to a kind of or wherein several mixture in the Rodrun series liquid crystal of the Vectra series liquid crystal of hydroxynaphthoic acid multipolymer and ethylene glycol terephthalate P-hydroxybenzoic acid multipolymer unlike: described thermotropic liquid crystal; Described lubricant is a kind of or wherein several mixture in paraffin, polyethylene wax, Poly Propylene Wax, stearic acid, Metallic stearates and ethylene-acrylic acid copolymer metal-salt.Other is identical with embodiment one or two.
Embodiment four: present embodiment and embodiment one to three unlike: described vegetable fibre powder is a kind of or wherein several mixture in wood powder, bamboo powder, agricultural residues powder, shell powder, bagasse and powdered rice hulls.Other is identical with embodiment one to three.
Embodiment five: present embodiment and embodiment one to four unlike: described agricultural residues powder is maize straw, wheat stalk, soybean stalk or rice straw.Other is identical with embodiment one to four.
Embodiment six: the preparation method of the polyolefin-based wood plastic composite of a kind of thermotropic high molecule liquid crystal activeness and quietness described in present embodiment, carry out according to following steps:
One, take: take 20 parts ~ 100 parts polyolefine, 30 parts ~ 200 parts vegetable fibre powders, 2 parts ~ 8 parts compatilizers, 1 part ~ 5 parts lubricants and 0.1 part ~ 5 parts thermotropic liquid crystals by mass fraction;
Two, 20 parts that step one are taken ~ 100 parts polyolefine, 2 parts ~ 8 parts compatilizers and 0.1 part ~ 5 parts thermotropic liquid crystals mix, obtain mixture A, mixture A forcing machine is carried out granulation, and prilling temperature is 170 DEG C ~ 250 DEG C, obtains liquid crystal and strengthens composite polyolefine material;
Three, 30 parts that step one are taken ~ 200 parts vegetable fibre powder, 1 part ~ 5 parts lubricants and liquid crystal enhancing composite polyolefine materials are even in high-speed mixer and mixing, obtain mixture B, then mixture B is carried out granulation by forcing machine, prilling temperature is 145 DEG C ~ 220 DEG C, obtains wood and moulds pellet;
Four, wood is moulded pellet and carry out forming process, namely obtain the polyolefin-based wood plastic composite of thermotropic high molecule liquid crystal activeness and quietness.
Forcing machine described in present embodiment step 2 is single screw extrusion machine or twin screw extruder.
Forcing machine described in present embodiment step 3 is single screw extrusion machine or twin screw extruder.
Liquid crystalline polymers (LCP) is a kind of to be made up of stiff molecule chain, can occur that the reactivity of existing liquid has again the polymer substance of the physicals anisotropic states (this state is called liquid crystal state) of crystal under certain physical condition.Thermotropic liquid crystal (TLCP), in its liquid crystal phase transition region, can form fento oriented structure, produces the self-enhancement of height, toughening effect.LCP can also play and cause crazing and shear zone effect in modified resin; easily form particle or fento under external force; be present in resin matrix with disperse phase; under stress; LCP as disperse phase can cause crazing and shear zone, and the stress concentration of Near A Crack Tip is relaxed, and hinders the expansion of crackle; system consumes large energy, thus resin toughness is improved.Due to the outspoken nature of TLCP molecular structure, can spontaneously streamwise orientation in the course of processing, produce obvious shear shinning behavior and self-enhancement effect, thus form in-situ composite.Fiber (as glass fibre, carbon fiber) wild phase ratio with traditional, can reduce the melt viscosity of TP, processing flowability is improved with TLCP modification, reduce machine-shaping energy consumption, improves the economy of processing.
The beneficial effect of present embodiment is: the polyolefin-based wood plastic composite outstanding feature of thermotropic high molecule liquid crystal activeness and quietness prepared by present embodiment is, by thermotropic liquid crystal higher for fusing point and TPO under the existence of compatilizer, melt blending is passed through at the temperature of coupling, under the effect of temperature and shearing force, form fento oriented structure, be present in polyolefin resin matrix with disperse phase, solve other wild phases and disperse uneven problem as fiber, nanoparticle are moulded in matrix at wood, under stress, thermotropic liquid crystal as disperse phase can cause crazing and shear zone, the stress concentration of Near A Crack Tip is relaxed, hinder the expansion of crackle, system consumes large energy, and the vegetable fibre that wild phase moulded by liquid crystal fine fibrilation and wood can play the collaborative effect strengthening polyolefin resin matrix, the intensity that the while of reaching, remarkable improvement wood is moulded and the effect of toughness, so wood prepared by the present invention moulds its intensity and toughness not only far above Traditional Wood moulding material, and performance is far above the thermotropic high molecule liquid crystal activeness and quietness composite polyolefine material do not added prepared by vegetable fibre powder, in addition thermotropic liquid crystal is moulded in matrix at wood and is uniformly dispersed, improve wooden rheological behaviour of moulding in the course of processing, and consumption is less, cost is lower, achieve and reach the object of wood being moulded to modification by modified resin matrix, WPC actual production research is had great importance.
The polyolefin-based wood plastic composite of thermotropic high molecule liquid crystal activeness and quietness prepared by present embodiment, tensile strength improves 10% ~ 40%, flexural strength improves 20% ~ 40%, and shock strength improves 30-60%, makes wood plastic composite mechanics carry out activeness and quietness modification simultaneously.
Embodiment seven: present embodiment and embodiment six unlike: the polyolefine described in step one is a kind of or wherein several mixture in polyethylene, polypropylene, polyvinyl chloride and polystyrene; Compatilizer described in step one is a kind of or wherein several mixture in the polyethylene of maleic anhydride graft, the polypropylene of maleic anhydride graft, titanic acid ester, isocyanide ester, aminosilane, vinyl silanes and methacryloxypropyl silane; Thermotropic liquid crystal described in step one is that the Xydar series liquid crystal of P-hydroxybenzoic acid '-biphenyl diphenol terephthaldehyde acid copolymer, P-hydroxybenzoic acid are to a kind of or wherein several mixture in the Rodrun series liquid crystal of the Vectra series liquid crystal of hydroxynaphthoic acid multipolymer and ethylene glycol terephthalate P-hydroxybenzoic acid multipolymer; Lubricant described in step one is a kind of or wherein several mixture in paraffin, polyethylene wax, Poly Propylene Wax, stearic acid, Metallic stearates and ethylene-acrylic acid copolymer metal-salt; Vegetable fibre powder described in step one is a kind of or wherein several mixture in wood powder, bamboo powder, agricultural residues powder, shell powder, bagasse and powdered rice hulls.Other is identical with embodiment six.
Embodiment eight: one of present embodiment and embodiment six or seven unlike: described agricultural residues powder is maize straw, wheat stalk, soybean stalk or rice straw.Other is identical with embodiment six or seven.
Embodiment nine: one of present embodiment and embodiment six to eight unlike: the forming process described in step 4 is extrusion moulding, injection moulding or hot-forming.Other is identical with embodiment six to eight.
Embodiment ten: one of present embodiment and embodiment six to nine unlike: when described forming process is extrusion moulding, extrusion temperature is 140 DEG C ~ 200 DEG C, and die temperature is 140 DEG C ~ 200 DEG C; When described forming process is injection moulding, injecting machine material tube temperature is 160 DEG C ~ 240 DEG C, and nozzle temperature is 160 DEG C ~ 240 DEG C, and injection pressure is 30MPa ~ 60MPa; When described forming process is hot-forming, hot pressing temperature is 140 DEG C ~ 200 DEG C, and pressure is 1.5MPa ~ 7.5MPa, sizing after cooling.Other is identical with embodiment six to nine.
Extrusion moulding described in present embodiment uses single screw extrusion machine or twin screw extruder.
Following examples are adopted to verify beneficial effect of the present invention:
Embodiment one:
The preparation method of the polyolefin-based wood plastic composite of a kind of thermotropic high molecule liquid crystal activeness and quietness described in the present embodiment, specifically carries out according to following steps:
One, take: take 40 parts of polyolefine, 55 parts of vegetable fibre powders, 3 parts of compatilizers, 2 parts of lubricants and 1.2 parts of thermotropic liquid crystals by mass fraction;
Two, 40 parts of polyolefine step one taken, 3 parts of compatilizers and 1.2 parts of thermotropic liquid crystals mix, obtain mixture A, mixture A twin screw extruder is carried out granulation, prilling temperature one to seven district is followed successively by 195 DEG C, 200 DEG C, 210 DEG C, 220 DEG C, 220 DEG C, 215 DEG C and 205 DEG C, screw speed is 30r/min, obtains liquid crystal and strengthens composite polyolefine material;
Three, it is even in high-speed mixer and mixing that 55 parts of vegetable fibre powders step one taken, 2 parts of lubricants and liquid crystal strengthen composite polyolefine material, obtain mixture B, then mixture B is carried out granulation by twin screw extruder, prilling temperature one to seven district is followed successively by 145 DEG C, 150 DEG C, 155 DEG C, 160 DEG C, 165 DEG C, 160 DEG C and 155 DEG C, screw speed is 30r/min, obtains wood and moulds pellet;
Four, wood is moulded pellet and carry out forming process, obtain the polyolefin-based wood plastic composite of thermotropic high molecule liquid crystal activeness and quietness.
Polyolefine described in step one is polyethylene: trade mark 5000S, Daqing petrochemical;
Compatilizer described in step one is the polyethylene of maleic anhydride graft, and percentage of grafting is 1wt%, melting index >=50g/10min, Rizhisheng New Technology Development Co., Ltd., Shanghai;
Thermotropic liquid crystal model described in step one is A950, for P-hydroxybenzoic acid is to the Vectra series liquid crystal of hydroxynaphthoic acid multipolymer, and Dongguan City camphorwood Tou Huaxin plastic material company limited;
Lubricant described in step one is paraffin, commercially available;
Vegetable fibre powder described in step one is Poplar Powder, 20 order ~ 80 orders, water ratio≤3%.
Forming process described in step 4 be Single screw extrusion shaping time, set a district and be followed successively by 145 DEG C, 150 DEG C, 160 DEG C and 165 DEG C to four district's temperature, mould temperature is 170 DEG C, and screw speed is 15r/min.
Embodiment two: present embodiment and embodiment one unlike: take 40 parts of polyolefine, 55 parts of vegetable fibre powders, 3 parts of compatilizers, 2 parts of lubricants and 2.4 parts of thermotropic liquid crystals by mass fraction in step one.Other is identical with embodiment one.
Embodiment three: present embodiment and embodiment one unlike: take 40 parts of polyolefine, 55 parts of vegetable fibre powders, 3 parts of compatilizers, 2 parts of lubricants and 3.6 parts of thermotropic liquid crystals by mass fraction in step one.Other is identical with embodiment one.
Simultaneous test one: the simultaneous test of embodiment one to three, present embodiment and embodiment one unlike: take 40 parts of polyolefine, 55 parts of vegetable fibre powders, 3 parts of compatilizers and 2 parts of lubricants by mass fraction in step one.Other is identical with embodiment one.
Embodiment four:
A kind of thermotropic high molecule liquid crystal activeness and quietness composite polyolefine material described in the present embodiment, specifically carries out according to following steps:
One, take: take 40 parts of polyolefine, 3 parts of compatilizers and 1.2 parts of thermotropic liquid crystals by mass fraction;
Two, 40 parts of polyolefine step one taken, 3 parts of compatilizers and 1.2 parts of thermotropic liquid crystals mix, obtain mixture A, mixture A twin screw extruder is carried out granulation, prilling temperature one to seven district is followed successively by 195 DEG C, 200 DEG C, 210 DEG C, 220 DEG C, 220 DEG C, 215 DEG C and 205 DEG C, screw speed is 30r/min, obtains liquid crystal and strengthens composite polyolefine material;
Three, liquid crystal is strengthened composite polyolefine material and carry out forming process, obtain thermotropic high molecule liquid crystal activeness and quietness composite polyolefine material.
Polyolefine described in step one is polyethylene: trade mark 5000S, Daqing petrochemical;
Compatilizer described in step one is the polyethylene of maleic anhydride graft, and percentage of grafting is 1wt%, melting index >=50g/10min, Rizhisheng New Technology Development Co., Ltd., Shanghai;
Thermotropic liquid crystal model described in step one is A950, for P-hydroxybenzoic acid is to the Vectra series liquid crystal of hydroxynaphthoic acid multipolymer, and Dongguan City camphorwood Tou Huaxin plastic material company limited;
Forming process described in step 3 be Single screw extrusion shaping time, set a district and be followed successively by 145 DEG C, 150 DEG C, 160 DEG C and 165 DEG C to four district's temperature, mould temperature is 170 DEG C, and screw speed is 15r/min.
Embodiment five: present embodiment and embodiment four unlike: take 40 parts of polyolefine, 3 parts of compatilizers and 2.4 parts of thermotropic liquid crystals by mass fraction in step one.Other is identical with embodiment four.
Embodiment six: present embodiment and embodiment four unlike: take 40 parts of polyolefine, 3 parts of compatilizers and 3.6 parts of thermotropic liquid crystals by mass fraction in step one.Other is identical with embodiment four.
Simultaneous test two: the simultaneous test of embodiment four to six, present embodiment and embodiment four unlike: take 40 parts of polyolefine and 3 parts of compatilizers by mass fraction in step one.Other is identical with embodiment four.
Matrix material prepared by the polyolefin-based wood plastic composite of thermotropic high molecule liquid crystal activeness and quietness prepare embodiment one to three and simultaneous test one carries out static mechanical property test, and stretch, bend and shock strength test, result is as shown in table 1.
Matrix material prepared by the thermotropic high molecule liquid crystal activeness and quietness composite polyolefine material prepare embodiment four to six and simultaneous test two carries out static mechanical property test, and stretch, bend and shock strength test, result is as shown in table 2.
Table 1: the polyolefin-based wood plastic composite mechanical experimental results of thermotropic high molecule liquid crystal activeness and quietness
| Test event | Tensile strength (MPa) | Bending strength (MPa) | Shock strength (kJ/m 2) |
| Testing method | ASTM D638-03 | ASTM D790-03 | ASTM D4812 |
| Embodiment one | 38.76±0.40 | 64.32±0.88 | 11.95±0.77 |
| Embodiment two | 39.40±0.59 | 66.00±1.73 | 12.09±0.77 |
| Embodiment three | 40.33±0.44 | 66.44±2.43 | 11.98±1.03 |
| Simultaneous test one | 30.13±1.03 | 52.12±2.20 | 8.75±0.44 |
Table 2: thermotropic high molecule liquid crystal activeness and quietness composite polyolefine material mechanical experimental results
| Test event | Tensile strength (MPa) | Bending strength (MPa) | Shock strength (kJ/m 2) |
| Testing method | ASTM D638-03 | ASTM D790-03 | ASTM D256 |
| Embodiment four | 32.32±1.6 | 49.57±4.54 | 25.36±0.97 |
| Embodiment five | 31.23±1.93 | 55.09±2.11 | 26.24±1.77 |
| Embodiment six | 32.17±3.04 | 55.21±4.43 | 26.5±1.33 |
| Simultaneous test two | 29.98±1.39 | 46.06±1.8 | 22.05±1.12 |
As seen from table, embodiment one, two, three and simultaneous test one all under identical experiment condition granulation extrude, when thermotropic liquid crystal adds 1.2,2.4,3.6 parts respectively, the polyolefin-based wood plastic composite tensile strength of thermotropic high molecule liquid crystal activeness and quietness improves 28.64%, 30.77%, 33.85% respectively; Bending strength improves 23.41%, 26.63%, 27.48% respectively; Shock strength improves 36.57%, 38.17%, 36.91% respectively; Embodiment four, five with six all under identical experiment condition granulation extrude, do not add vegetable fibre powder, the thermotropic high molecule liquid crystal activeness and quietness composite polyolefine material tensile strength prepared is substantially constant compared with embodiment one, two and three; Bending strength improves 7.6%, 19.6%, 19.87% respectively; Shock strength improves 15.01%, 19.0%, 20.18% respectively.As known from the above, add intensity and toughness that thermotropic liquid crystal can improve polyolefine material, and add vegetable fibre powder, the vegetable fibre moulding wild phase due to liquid crystal fine fibrilation and wood can play the collaborative effect strengthening polyolefin resin matrix, so add intensity and the toughness that thermotropic liquid crystal can improve wood plastic composite simultaneously, and improved performance is better, there is important meaning to the raising of its mechanical property.
Claims (10)
1. the polyolefin-based wood plastic composite of thermotropic high molecule liquid crystal activeness and quietness, is characterized in that the polyolefin-based wood plastic composite of a kind of thermotropic high molecule liquid crystal activeness and quietness is prepared from by 20 parts ~ 100 parts polyolefine, 30 parts ~ 200 parts vegetable fibre powders, 2 parts ~ 8 parts compatilizers, 1 part ~ 5 parts lubricants and 0.1 part ~ 5 parts thermotropic liquid crystals by mass fraction.
2. the polyolefin-based wood plastic composite of a kind of thermotropic high molecule liquid crystal activeness and quietness according to claim 1, is characterized in that described polyolefine is a kind of or wherein several mixture in polyethylene, polypropylene, polyvinyl chloride and polystyrene; Described compatilizer is a kind of or wherein several mixture in the polyethylene of maleic anhydride graft, the polypropylene of maleic anhydride graft, titanic acid ester, isocyanide ester, aminosilane, vinyl silanes and methacryloxypropyl silane.
3. the polyolefin-based wood plastic composite of a kind of thermotropic high molecule liquid crystal activeness and quietness according to claim 1, is characterized in that described thermotropic liquid crystal is that the Xydar series liquid crystal of P-hydroxybenzoic acid '-biphenyl diphenol terephthaldehyde acid copolymer, P-hydroxybenzoic acid are to a kind of or wherein several mixture in the Rodrun series liquid crystal of the Vectra series liquid crystal of hydroxynaphthoic acid multipolymer and ethylene glycol terephthalate P-hydroxybenzoic acid multipolymer; Described lubricant is a kind of or wherein several mixture in paraffin, polyethylene wax, Poly Propylene Wax, stearic acid, Metallic stearates and ethylene-acrylic acid copolymer metal-salt.
4. the polyolefin-based wood plastic composite of a kind of thermotropic high molecule liquid crystal activeness and quietness according to claim 1, is characterized in that described vegetable fibre powder is a kind of or wherein several mixture in wood powder, bamboo powder, agricultural residues powder, shell powder, bagasse and powdered rice hulls.
5. the polyolefin-based wood plastic composite of a kind of thermotropic high molecule liquid crystal activeness and quietness according to claim 4, is characterized in that described agricultural residues powder is maize straw, wheat stalk, soybean stalk or rice straw.
6. prepare the method for the polyolefin-based wood plastic composite of a kind of thermotropic high molecule liquid crystal activeness and quietness according to claim 1, it is characterized in that the preparation method of the polyolefin-based wood plastic composite of a kind of thermotropic high molecule liquid crystal activeness and quietness carries out according to the following steps:
One, take: take 20 parts ~ 100 parts polyolefine, 30 parts ~ 200 parts vegetable fibre powders, 2 parts ~ 8 parts compatilizers, 1 part ~ 5 parts lubricants and 0.1 part ~ 5 parts thermotropic liquid crystals by mass fraction;
Two, 20 parts that step one are taken ~ 100 parts polyolefine, 2 parts ~ 8 parts compatilizers and 0.1 part ~ 5 parts thermotropic liquid crystals mix, obtain mixture A, mixture A forcing machine is carried out granulation, and prilling temperature is 170 DEG C ~ 250 DEG C, obtains liquid crystal and strengthens composite polyolefine material;
Three, 30 parts that step one are taken ~ 200 parts vegetable fibre powder, 1 part ~ 5 parts lubricants and liquid crystal enhancing composite polyolefine materials are even in high-speed mixer and mixing, obtain mixture B, then mixture B is carried out granulation by forcing machine, prilling temperature is 145 DEG C ~ 220 DEG C, obtains wood and moulds pellet;
Four, wood is moulded pellet and carry out forming process, namely obtain the polyolefin-based wood plastic composite of thermotropic high molecule liquid crystal activeness and quietness.
7. the preparation method of the polyolefin-based wood plastic composite of a kind of thermotropic high molecule liquid crystal activeness and quietness according to claim 6, is characterized in that the polyolefine described in step one is a kind of or wherein several mixture in polyethylene, polypropylene, polyvinyl chloride and polystyrene; Compatilizer described in step one is a kind of or wherein several mixture in the polyethylene of maleic anhydride graft, the polypropylene of maleic anhydride graft, titanic acid ester, isocyanide ester, aminosilane, vinyl silanes and methacryloxypropyl silane; Thermotropic liquid crystal described in step one is that the Xydar series liquid crystal of P-hydroxybenzoic acid '-biphenyl diphenol terephthaldehyde acid copolymer, P-hydroxybenzoic acid are to a kind of or wherein several mixture in the Rodrun series liquid crystal of the Vectra series liquid crystal of hydroxynaphthoic acid multipolymer and ethylene glycol terephthalate P-hydroxybenzoic acid multipolymer; Lubricant described in step one is a kind of or wherein several mixture in paraffin, polyethylene wax, Poly Propylene Wax, stearic acid, Metallic stearates and ethylene-acrylic acid copolymer metal-salt; Vegetable fibre powder described in step one is a kind of or wherein several mixture in wood powder, bamboo powder, agricultural residues powder, shell powder, bagasse and powdered rice hulls.
8. the preparation method of the polyolefin-based wood plastic composite of a kind of thermotropic high molecule liquid crystal activeness and quietness according to claim 7, is characterized in that described agricultural residues powder is maize straw, wheat stalk, soybean stalk or rice straw.
9. the preparation method of the polyolefin-based wood plastic composite of a kind of thermotropic high molecule liquid crystal activeness and quietness according to claim 6, is characterized in that the forming process described in step 4 is extrusion moulding, injection moulding or hot-forming.
10. the preparation method of the polyolefin-based wood plastic composite of a kind of thermotropic high molecule liquid crystal activeness and quietness according to claim 9, it is characterized in that when described forming process is extrusion moulding, extrusion temperature is 140 DEG C ~ 200 DEG C, and die temperature is 140 DEG C ~ 200 DEG C; When described forming process is injection moulding, injecting machine material tube temperature is 160 DEG C ~ 240 DEG C, and nozzle temperature is 160 DEG C ~ 240 DEG C, and injection pressure is 30MPa ~ 60MPa; When described forming process is hot-forming, hot pressing temperature is 140 DEG C ~ 200 DEG C, and pressure is 1.5MPa ~ 7.5MPa, sizing after cooling.
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