CN1850900A - Composition for manufacturing polypropylene base wood-plastic composite material - Google Patents
Composition for manufacturing polypropylene base wood-plastic composite material Download PDFInfo
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Abstract
The invention discloses a manufacture formulation of polypropylene radical wood plastic compounding material that is made up from: 100/25-100/170 weight portions polypropylene/ wood powder, 1-40 weight portions nanometer rigidity intensifier; 0-10 portions chlorinated polyethylene; 1.0-3.0 weight portions antioxidant; 0.5-3.0 weight portions polyethylene wax, 0.5-3.0 portions stearic acid; and 2.0-10% of the wood powder and nanometer rigidity intensifier dispersing agent. The invention has good processing behavior, good mechanical property, and low cost.
Description
Technical field
The present invention relates to a kind of manufacturing prescription of polypropylene base wood-plastic composite material.
Background technology
Plastics/wood flour composite material is that to utilize thermoplastic and wood powder, bamboo powder, shell powder or agricultural crop straw powder etc. be primary raw material, through mixing and processing and forming and a kind of advanced composite material (ACM) that makes. It combines the advantage of plastic products and timber, have be not afraid of erosion by wind and rain, little, the infringement that is not subjected to mould or termite of contraction or expansion distortion under the varying environment condition, the various section bars that can be processed into difformity and color, easily machining and bonding, natural texture good, characteristics such as contaminated soil or underground water not. In addition, the recyclable recycling of wood plastic composite need not be maintained in the use procedure.
Wood plastic composite can be used for following aspect: the various profile shapes such as architectural movable dwellings, concrete blinding, wall, floor, balustrade; Industrial chemical industry and the builder's temporary shed of public place, model, bonnet, water pump shell, electrical equipment material; Dalle on family, office or the shipping vehicle; Various transporting boxes and furniture material etc., application is very extensive.
Production and the application of research and development wood plastic composite, not only will be for the development of the national economy increase a kind of inexpensive new material that has wide application prospects, and can open up a new way for the harm that reduces the waste or used plastics goods and the comprehensive utilization ratio that improves timber; Conversely, a large amount of wood chips and waste or used plastics are again for producing the wood plastic composite source that furnishes ample material, and be significant with energy savings to developing a circular economy.
The thermoplastic that wood plastic composite is used mainly is polypropylene (PP), polyvinyl chloride (PVC) and polyethylene (PE) at present. Different thermoplastics is that the performance of the wood plastic composite of matrix has than big difference.
The main component of wood powder (comprising bamboo powder, shell powder or agricultural crop straw powder) is ligno-ccllulose, a large amount of hydroxy functional groups is contained on the surface, make its surface show very strong chemical polarity and autohemagglutination effect, less with the poor and interaction force of hydrophobic polyacrylic compatibility, too high decomposes when easy of processing temperature; Because wood powder is the hard particles of lightweight, cause easily wood plastic composite in melt temperature current downflow difficulty when filling in a large number simultaneously, processing characteristics obviously descends. The hydrophobicity of polyacrylic strand is large, easily crystallization, rigidity is little, fragility is large, and it is narrow that melt is in the temperature range of elastic stage. More than all reasons cause easily wood powder in polypropylene, to be not easy to be uniformly dispersed, the processing temperature narrow range of polypropylene base wood-plastic composite material, melt flows difficulty, the combination property of product is poor.
In the research of carrying out polypropylene base wood-plastic composite material, how to make between hydrophilic wood powder surface and the hydrophobic polypropylene interface to have good compatibility, forefathers have done many work. At present, the producer of domestic production polypropylene base wood-plastic composite material and bibliographical information almost all adopt the coupling agent treatment wood powder or add the method for compatilizer, as adopt silane, isocyanates, the metatitanic acid ester, Aluminate, the coupling agent treatment wood powders such as the aluminium titanium is compound or adding CPE (haloflex), EVA (ethylene/vinyl acetate bipolymer), the compatilizers such as MES (methyl methacrylate/butyl acrylate/styrene copolymer) or ABS (acrylonitrile/butadiene/styrene terpolymer), to improve the combination of wood powder and acrylic resin, in the little situation of Wood flour filled amount, its effect also clearly, but ignored in the wood plastic composite molding process wood powder and the problem such as in polypropylene, disperseed, it is little to exist Wood flour filled amount, wood powder disperses bad in polypropylene, the melt flows difficulty, products appearance is coarse, rigidity is little, impact strength and heat distortion temperature are low, the shortcomings such as wearability and weatherability are poor, polypropylene base wood-plastic composite material is high volume applications out of doors.
Requirement owing to polypropylene and the structural reason of wood powder and polypropylene base wood-plastic composite material processing and combination property, must improve with the nano redigity reinforcing agent heat distortion temperature, rigidity and the impact strength of composite, and the loading of increase wood powder, this need to solve wood powder and the scattering problem of nano redigity reinforcing agent in polypropylene technically, thereby improve the combination property of composite, expand the application of polypropylene base wood-plastic composite material.
Summary of the invention
The purpose of this patent provides a kind of manufacturing prescription of polypropylene base wood-plastic composite material. The inventor herein thinks, polypropylene base wood-plastic composite material will have preferably comprehensive physical mechanical performance and processing characteristics, except must solution how making between hydrophilic wood powder surface and the hydrophobic polypropylene interface have the problem of good compatibility, main key problem in technology is that the wood powder and the nano redigity reinforcing agent that how to solve high filler loading capacity reach fine dispersion in polypropylene, so that wood powder is coated fully by polypropylene and the nano redigity reinforcing agent really plays enhancing and toughening effect in polypropylene, thereby improves the combination property of polypropylene base wood-plastic composite material.
The chemical composition of wood powder makes its surface show very strong chemical polarity and autohemagglutination effect, if wood powder can not better disperse in polypropylene, wood powder can not be coated fully by polypropylene, fluidity of molten is poor in the time of will causing composite processing, physical and mechanical properties is uneven, the defectives such as product surface is coarse, and the little and weatherability of Wood flour filled amount is poor; Equally, the nano redigity reinforcing agent is reunited very easily because particle diameter is little, if can not reach fine dispersion in polypropylene, the hot strength of composite, heat distortion temperature, rigidity and impact strength can not improve.
One of main contents of this patent are to have added the nano redigity reinforcing agent in polypropylene base wood-plastic composite material; Two of the main contents of this patent are to have added a class dispersant in polypropylene base wood-plastic composite material, have strengthened wood powder and nano redigity reinforcing agent and polyacrylic interface compatibility and wood powder and the dispersiveness of nano redigity reinforcing agent in polypropylene. Compare with the method for coupling agent treatment wood powder, the adding of nano redigity reinforcing agent and dispersant, greatly increased the loading of wood powder, improve the processing characteristics of polypropylene base wood-plastic composite material, improved rigidity, hot strength, impact strength, heat distortion temperature, weatherability and the presentation quality of polypropylene base wood-plastic composite material.
The adding of nano redigity reinforcing agent and dispersant when greatly having increased Wood flour filled amount, has improved the processing characteristics of polypropylene base wood-plastic composite material and the physical and mechanical properties of goods on the whole. Trace it to its cause, mainly in the following aspects:
(1) in the polypropylene and wood powder mixed process of molten condition, because the fusing point of dispersant is less than polypropylene, dispersant plays lubricated, obstruct and peptizaiton to wood powder particle and nano redigity reinforcing agent mixing the incipient stage, reduce the autohemagglutination effect of wood powder and nano redigity reinforcing agent, thereby wood powder and the dispersiveness of nano redigity reinforcing agent in melt polypropylene have been improved, thereby promote the nano redigity reinforcing agent to play enhancing and toughening effect, promoted wood powder to be coated fully by polypropylene;
(2) wood powder and the dispersion effect of nano redigity reinforcing agent in polypropylene, be decided by whether melt polypropylene is in the optimum viscosity state in limited processing temperature scope, melt polypropylene with optimum viscosity is greater than its agglomeration power because of shearing force that distortion passes to wood powder and nano redigity reinforcing agent (being aggregate before disperseing) in process, favourable to the dispersion of wood powder and nano redigity reinforcing agent. If melt polypropylene viscosity is too small, the shearing force that passes to the filler aggregate in its deformation process is less, and then the filler aggregate is sneaked into easily, but can not be broken and can't reach fine dispersion. Under the normal processing technology condition, the adding of dispersant has improved polypropylene and has been in the temperature range of elastic stage, thereby the aggregate that makes wood powder and nano redigity reinforcing agent is in limited processing temperature scope, be subject to very large shearing force, promoted its dispersion in melt polypropylene;
(3) because dispersant molecule is certain polarity, the interaction at wood powder and nano redigity reinforcing agent and polypropylene interface is strengthened, increased interfacial layer thickness;
(4) be solid-state in this class novel dispersant normal temperature scope, the intensity of itself is higher, has reduced the stress of boundary layer between polypropylene and wood powder and the nano redigity reinforcing agent and has concentrated, and has improved on the whole the comprehensive physical mechanical performance of composite;
(5) because wood powder and nano redigity reinforcing agent have reached fine dispersion in melt polypropylene, in limited processing temperature scope, reduce on the whole the viscosity of polypropylene base wood-plastic composite material melt, improved its flowability, provide possibility for increasing Wood flour filled amount;
(6) because the nano redigity reinforcing agent plays the effect of nucleator in polypropylene base wood-plastic composite material, make polypropylene even at the machine-shaping post crystallization, avoid the generation of large spherocrystal, thereby improved the dimensional stability of impact strength, heat distortion temperature and the product of composite.
The manufacturing prescription of polypropylene base wood-plastic composite material provided by the invention, described polypropylene base wood-plastic composite material is mixed by mass fraction by following raw materials according: the consumption of polypropylene/wood powder is 100/25～100/170 quality part; The consumption of nano redigity reinforcing agent is 1～40 quality part; The consumption of haloflex is 0～10 quality part; The consumption of antioxidant is 1.0～3.0 quality parts; The consumption of Tissuemat E is 0.5～3.0 quality part; Stearic consumption is 0.5～3.0 quality part; Dispersant dosage is 2.0%～10% of wood powder and nano redigity reinforcing agent.
The consumption of above-mentioned polypropylene/wood powder is 100/50～100/150, and the nano redigity reinforcing agent is that nano grade inorganic active reinforcing agent consumption is 10～30 quality parts.
Above-mentioned dispersant is molecular weight at 4000～300000 hydroxyl or the synthetic resin of carboxyl and the mixture of interfacial agent thereof.
The consumption of above-mentioned haloflex is 10 quality parts; Antioxidant is that the phenol stabilizer consumption is 2.0 quality parts; The consumption of Tissuemat E is 1.0 quality parts; Stearic consumption is 1.0 quality parts.
Above-mentioned nano redigity reinforcing agent is light color nanometer level inorganic active reinforcing agent.
Above-mentioned nano redigity reinforcing agent is white carbon or nano-calcium carbonate or nano-sized magnesium hydroxide.
Above-mentioned wood powder is any or its mixture in common wood powder, bamboo powder, shell powder, the agricultural crop straw powder.
More than the prepared polypropylene wood plastic composite materials of prescription has good processing characteristics and physical and mechanical properties, smooth, the Wood flour filled amount of product surface are uniformly dispersed greatly and easily, the advantage such as cheap for manufacturing cost. Composition of the present invention can be used for producing high-grade polypropylene base wood-plastic composite material, and alternative natural timber is widely used in fields such as indoor and outdoor decoration, building industry, packed and transported industries. Generally speaking, in polypropylene base wood-plastic composite material, add an amount of dispersant and nano redigity reinforcing agent, compare with the method for coupling agent treatment wood powder, strengthened the combination at wood powder and nano redigity reinforcing agent and polypropylene interface, promote wood powder in polypropylene dispersion and coated fully by polypropylene, thereby can greatly increase the loading of wood powder, obviously improve the outward appearance of physical and mechanical properties, moulding processability and the goods of the basic plastic composite materials of polypropylene, cheap for manufacturing cost.
The specific embodiment
Object lesson is seen basic recipe and the result of the test shown in lower tabulation 1 and the table 2.
Table 1: polypropylene base wood-plastic composite material basic recipe
| Formula number | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 |
| Wood powder | 25 | 50 | 50 | 50 | 50 | 50 | 100 | 100 | 100 | 100 | 100 | 100 | 150 | 150 | 17 0 |
| Reinforcing agent | / | / | / | 10 | 20 | 40 | / | 10 | / | 10 | 30 | 40 | / | 10 | 10 |
| Coupling agent | 0.8 | 1.5 | / | 1.8 | / | / | 3.0 | 3.3 | / | / | / | / | / | / | / |
| Dispersant | / | / | 1.0 | / | 1.4 | 1.8 | / | / | 1.0 | 2.2 | 6.5 | 14 | 7.5 | 19. 2 | 17 |
Annotate: all the other components of basic recipe following (quality part) in the table 1: polypropylene, 100; Antioxidant, 2.0; Tissuemat E, 1.0; Stearic acid, 1.0; Haloflex, 10. Reinforcing agent is that nano grade inorganic active reinforcing agent present embodiment uses white carbon, can also use nano-calcium carbonate or nano-sized magnesium hydroxide; Coupling agent is titanate coupling agent; Dispersant is molecular weight at 4000～300000 hydroxyl or the synthetic resin of carboxyl and the mixture of interfacial agent thereof, and consumption is 1.0%～12% of wood powder and nano redigity reinforcing agent. (this is the test consumption)
Table 2: polypropylene base wood-plastic composite material performance
| Formula number | Hot strength/MPa | Impact strength/(KJ/m2) | Heat distortion temperature/℃ | Water absorption rate/% | Laboratory plastics processing mill mixed refining process process phenomenon is described |
| 1 | 25.2 | 8.43 | 111 | 0.43 | Material is easy to rolling forming, and is mobile fine, smooth surface. |
| 2 | 18.7 | 5.78 | 113 | 0.95 | Material can rolling forming, and mobile general, there is a small amount of cavity surface and inside. |
| 3 | 23.3 | 7.66 | 116 | 0.65 | Material is easy to rolling forming, and is mobile general, smooth surface. |
| 4 | 17.1 | 6.79 | 113 | 0.72 | Material can rolling forming, and mobile general, there is a small amount of cavity surface and inside. |
| 5 | 27.2 | 12.4 | 119 | 0.54 | Material is easy to rolling forming, and is better mobile, and smooth surface is inner without the cavity. |
| 6 | 28.3 | 11.2 | 126 | 0.66 | Material can rolling forming, poor fluidity, and smooth surface, inner without the cavity. |
| 7 | 8.37 | 2.81 | 105 | 1.34 | The more difficult rolling forming of material, poor fluidity, rough surface, there are a large amount of cavities inside. |
| 8 | 10.2 | 3.86 | 109 | 1.59 | The more difficult rolling forming of material, poor fluidity, rough surface, there are a large amount of cavities inside. |
| 9 | 16.3 | 8.83 | 113 | 0.55 | Material can rolling forming, and is mobile general, rough surface, inner a small amount of cavity. |
| 10 | 18.4 | 11.2 | 120 | 0.65 | Material is easy to rolling forming, and is better mobile, and smooth surface is inner without the cavity. |
| 11 | 19.2 | 12.6 | 127 | 0.47 | Material can rolling forming, and is mobile general, and smooth surface is inner without the cavity. |
| 12 | 17.9 | 9.35 | 128 | 0.42 | Material can rolling forming, poor fluidity, and smooth surface, inner without the cavity. |
| 13 | 11.6 | 7.36 | 124 | 0.96 | Material can rolling forming, and is mobile general, rough surface, and there is a small amount of cavity inside. |
| 14 | 12.5 | 5.43 | 125 | 0.87 | Material can rolling forming, poor fluidity, and rough surface, there is a small amount of cavity inside. |
| 15 | 10.1 | 4.11 | 119 | 1.17 | The more difficult rolling forming of material, poor fluidity, rough surface, there are a large amount of cavities inside. |
With the object lesson of laboratory test, in basic recipe ratio each 50kg for preparing burden, after mixing on double screw extruder extruding pelletization, use again exhaust-type single-screw extrusion molding polypropylene base wood-plastic composite material section bar. Test obtains following result:
(1) example 1,3,5,6,10,11 material extruding pelletization are easy; Bath surface is glossy during extrusion molding, flows steadily, and finished surface is smooth and glossy, is the light yellow shape of wood powder. But example 3 nano redigity reinforcing agents useless, heat distortion temperature is less; The reinforcing agent consumption of example 6 is too large, poor fluidity; The finished product of example 1 is few because of the wood powder consumption, without the texture of timber;
(2) example 2,4,9,12,13,14 material extruding pelletization difficulty, pellet has powder; The bath surface part is glossy when example 2,4,9,12 extrusion molding, and finished surface is more coarse, and there is a small amount of cavity inside; Bath surface does not have gloss when example 13,14 extrusion molding, and finished surface is coarse, and there is the cavity inside. This is because example 2,4 is used titanate coupling agent; The dispersant dosage of example 9 very little, and reinforcing agent useless, heat distortion temperature is less; The reinforcing agent large usage quantity of example 12, poor fluidity; Example 13,14 wood powder large usage quantity;
(3) example 7,8,15 material extruding pelletization difficulty, pellet is a large amount of powderies; Bath surface is buff during extrusion molding, and the spot of black is arranged, and it is not steady to flow; Finished surface is coarse, and there are a lot of cavities surface and inside. This is because the wood powder consumption of example 7,8 usefulness titanate coupling agents and example 15 is too large.
Can find out that from above result of the test patent of the present invention adds a class dispersant in polypropylene base wood-plastic composite material, solve the wood powder of high filler loading capacity and the nano redigity reinforcing agent reaches fine dispersion in polypropylene key technical problem; Add the nano redigity reinforcing agent, obviously improved heat distortion temperature, hot strength and the impact strength of wood plastic composite. But the consumption that adds the nano redigity reinforcing agent is too large, the mobile obviously variation of wood plastic composite, and wood powder/nano redigity reinforcing agent is 50～150/30～10 suitable.
In a word, compare with the method for coupling agent treatment wood powder, the application of dispersant has promoted wood powder and nano redigity reinforcing agent dispersiveness and the wood powder in polypropylene to be coated fully by polypropylene greatly, wood powder and polyacrylic compatibility have been strengthened simultaneously, thereby can greatly increase the loading of wood powder, reduced the cost of raw material of polypropylene wood plastic composite materials, improve simultaneously the outward appearance of physical and mechanical properties, moulding processability and the goods of polypropylene base wood-plastic composite material, had obvious superiority of effectiveness; Add the nano redigity reinforcing agent, obviously improved the physical and mechanical properties of wood plastic composite.
Laboratory test methods:
First with wood powder at 80 ℃ * 2 hours oven dryings, under the normal temperature wood powder, polypropylene and other compounding ingredient mixed in homogenizer after 5 minutes and take out, obtain compound. With compound 190 ℃ plastics processing mill plasticizing 3 minutes, slice, range estimation sheet material outward appearance under the ordinary ray, 180 ℃ * 10MPa of hot pressing on purl machine * 3 minutes, colded pressing at normal temperatures 5 minutes, sample preparation on the plastics model machine is with reference to hot strength, impact strength, heat distortion temperature and the water absorption rate of concerned countries standard test composite. Wherein, heat distortion temperature is measured under little loading condiction, and water absorption rate is the mass change that keeps 48 hours front and back in 80 ℃ water.
The extrusion profile method:
Be on the double screw extruder of 35mm behind the extruding pelletization at screw diameter with above-mentioned compound, at the sheet material of single screw extrusion machine extrusion molding 50 * 10mm, each section of extruder temperature is 120 ℃～200 ℃. Condition of molding also can be decided according to section bar specification and extruder model.
Specifications of raw materials is as follows:
Polypropylene granules, T30S, Period In Maoming petrifaction ethylene industrial group; Wood powder, 120 orders, Linan City jewel bamboo wood powder Co., Ltd product; Titanate coupling agent KR-238S, Guangzhou monarch's leaf coupling agent Co., Ltd product; White carbon (255N), Jiangxi Nan Ji chemical industry Co., Ltd product; Nano-calcium carbonate, Shanghai Yaohua Nano-Tech Co., Ltd.'s product; Nano-sized magnesium hydroxide, Dalian Yatai Science and Technology New Material Co., Ltd.'s product; Haloflex (135A type), stearic acid, Tissuemat E, antioxidant, Dongshan, dispersant Guangzhou industrial chemicals Co., Ltd sell product.
Claims (7)
1. the manufacturing prescription of a polypropylene base wood-plastic composite material, it is characterized in that: described polypropylene base wood-plastic composite material is mixed by mass fraction by following raw materials according: the consumption of polypropylene/wood powder is 100/25～100/170 quality part; The consumption of nano redigity reinforcing agent is 1～40 quality part; The consumption of haloflex is 0～10 quality part; The consumption of antioxidant is 1.0～3.0 quality parts; The consumption of Tissuemat E is 0.5～3.0 quality part; Stearic consumption is 0.5～3.0 quality part; Dispersant dosage is 2.0%～10% of wood powder and nano redigity reinforcing agent.
2. the manufacturing prescription of a kind of polypropylene base wood-plastic composite material according to claim 1, it is characterized in that: the consumption of above-mentioned polypropylene/wood powder is 100/50～100/150, and the nano redigity reinforcing agent is that nano grade inorganic active reinforcing agent consumption is 10～30 quality parts.
3. the manufacturing prescription of a kind of polypropylene base wood-plastic composite material according to claim 1 and 2 is characterized in that: above-mentioned dispersant is molecular weight at 4000～300000 hydroxyl or the synthetic resin of carboxyl and the mixture of interfacial agent thereof.
4. the manufacturing prescription of a kind of polypropylene base wood-plastic composite material according to claim 1 and 2, it is characterized in that: the consumption of above-mentioned haloflex is 10 quality parts; Antioxidant is that the phenol stabilizer consumption is 2.0 quality parts; The consumption of Tissuemat E is 1.0 quality parts; Stearic consumption is 1.0 quality parts.
5. the manufacturing prescription of a kind of polypropylene base wood-plastic composite material according to claim 1 and 2, it is characterized in that: above-mentioned nano redigity reinforcing agent is light color nanometer level inorganic active reinforcing agent.
6. the manufacturing prescription of a kind of polypropylene base wood-plastic composite material according to claim 1 and 2, it is characterized in that: above-mentioned nano redigity reinforcing agent is white carbon or nano-calcium carbonate or nano-sized magnesium hydroxide.
7. the manufacturing prescription of a kind of PP base wood-plastic composite material according to claim 1 and 2, it is characterized in that: above-mentioned wood powder is any or its mixture in common wood powder, bamboo powder, shell powder, the agricultural crop straw powder.
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| CN101525496A (en) * | 2009-03-27 | 2009-09-09 | 林朝枝 | Formulation of particles |
| CN101602871B (en) * | 2009-06-30 | 2011-04-13 | 东北林业大学 | Wood-plastic composite powder for selective laser sintering rapid forming and preparation method thereof |
| CN102516666A (en) * | 2011-12-15 | 2012-06-27 | 山东理工大学 | Polypropylene-based microcellular foaming wood-plastic composite material and production method thereof |
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| CN103436041A (en) * | 2013-07-26 | 2013-12-11 | 东莞利丰塑木有限公司 | Polypropylene plastic-wood composites and production technology thereof |
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| CN108864566A (en) * | 2018-06-22 | 2018-11-23 | 深圳市中京科林环保塑料技术有限公司 | The methods and applications of nanometer particle-modified bamboo powder |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101525496A (en) * | 2009-03-27 | 2009-09-09 | 林朝枝 | Formulation of particles |
| CN101602871B (en) * | 2009-06-30 | 2011-04-13 | 东北林业大学 | Wood-plastic composite powder for selective laser sintering rapid forming and preparation method thereof |
| CN102516666A (en) * | 2011-12-15 | 2012-06-27 | 山东理工大学 | Polypropylene-based microcellular foaming wood-plastic composite material and production method thereof |
| CN102952317B (en) * | 2012-10-19 | 2015-11-25 | 芜湖太平洋塑胶有限公司 | A kind of Plastic-wooden composite tray and preparation method thereof |
| CN102952317A (en) * | 2012-10-19 | 2013-03-06 | 芜湖太平洋塑胶有限公司 | Plastic-wooden composite tray and preparation method thereof |
| CN103436041A (en) * | 2013-07-26 | 2013-12-11 | 东莞利丰塑木有限公司 | Polypropylene plastic-wood composites and production technology thereof |
| CN105062112A (en) * | 2015-08-13 | 2015-11-18 | 许超群 | Anti-aging wood-plastic composite material and preparation method thereof |
| CN105670075A (en) * | 2016-01-19 | 2016-06-15 | 华南理工大学 | Method for preparing polyolefin wood-plastic composite material from pretreated crop straws |
| CN105670075B (en) * | 2016-01-19 | 2018-12-11 | 华南理工大学 | The method for preparing polyolefin wood-plastic composite using pretreatment agricultural crop straw |
| CN108864566A (en) * | 2018-06-22 | 2018-11-23 | 深圳市中京科林环保塑料技术有限公司 | The methods and applications of nanometer particle-modified bamboo powder |
| CN110964286A (en) * | 2018-09-28 | 2020-04-07 | 中国石油化工股份有限公司 | Polypropylene plastic-wood composite material and preparation method thereof |
| CN110797495A (en) * | 2019-09-28 | 2020-02-14 | 合肥国轩高科动力能源有限公司 | High-strength composite PE diaphragm and preparation method thereof |
| CN110797495B (en) * | 2019-09-28 | 2021-08-10 | 合肥国轩高科动力能源有限公司 | High-strength composite PE diaphragm and preparation method thereof |
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