CN103396675A - Raw material treatment method for injection molding grade micro-foaming wood-plastic composite material - Google Patents
Raw material treatment method for injection molding grade micro-foaming wood-plastic composite material Download PDFInfo
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- CN103396675A CN103396675A CN2013103047429A CN201310304742A CN103396675A CN 103396675 A CN103396675 A CN 103396675A CN 2013103047429 A CN2013103047429 A CN 2013103047429A CN 201310304742 A CN201310304742 A CN 201310304742A CN 103396675 A CN103396675 A CN 103396675A
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Abstract
The invention relates to a raw material treatment method for an injection molding grade micro-foaming wood-plastic composite material, which comprises the following steps: pulverizing bamboo and wood waste into 40-200 meshes, then screening to obtain powder having different finenesses, and blending the coarse and fine powder with bamboo and wood powder according to a certain ratio; under a nitrogen gas protective atmosphere, performing heat treatment on the blended bamboo and wood powder at 160-280 DEG C for 0.5-12 hours; under the condition of stirring at a high speed of 300-2800r/min, uniformly mixing the modified bamboo and wood powder with adsorbent, plastic, coupling agent, foaming agent, foaming promoter, pigment, compatilizer, lubricant, plasticizer and enhanced filler to prepare a mixture; and extruding and granulating the mixture through an extruder, thus obtaining the injection molding grade micro-foaming wood-plastic composite material. The wood-plastic composite material has the characteristics of high surface gloss, high strength and toughness, low cost and the like, and is suitable for various injection molding products of which the molding shape is relatively complex.
Description
Technical field
The present invention relates to the preparation method of wood plastic composite, be specifically related to the raw-material treatment process for injection grade fine foaming wood plastic composite materials.
Background technology
The appearance of wood plastic composite, make bamboo waste log and waste or used plastics be fully utilized, both can effectively improve the utilization ratio of bamboo timber, alleviate the contradiction that China's Forest Resources is poor, the bamboo wood supply is in short supply, can reduce again due to the environmental pollution of using plastics to bring.But because also there are some problem demanding prompt solutions in wood plastic composite, as badly in the interface compatibility of bamboo wood powder and plastics cause that product surface hardness is low, the shortcomings such as poor toughness, intensity are low, poor fluidity, easily craze and transfiguration, poor dimensional stability, life-span be short, special large for the goods difficulty of forming shape relative complex.Mainly all there is this problem of great amount of hydroxy group in the method for improving the interface compatibility of bamboo wood powder and plastics and proposes for bamboo and woods fiber.
1,, due to the existence of a large amount of polarity hydroxyls in bamboo wood powder surface, make the bamboo wood powder have stronger water absorption character., by measures such as heating, dryings, can reduce to a certain extent the water ratio of bamboo wood powder.Yet, be with the moisture control of bamboo wood powder very difficult below 0.5%.As everyone knows, when the bamboo wood powder is dried approaching drying, the dust explosion phenomenon occurring very easily, to process for processing, brings potential safety hazard.Therefore, the moisture of removing in the bamboo wood powder by common drying process not only is difficult to realize, and can greatly increases production cost.
2, in foaming process, the moisture in the bamboo wood powder can have a strong impact on foaming quality, causes micro-pore shape irregular, and size is uneven, and the hole phenomenon occurs.As everyone knows, the quality of foaming quality directly determines the performance difference of product, and therefore for the fine foaming wood plastic composite materials, the most important condition of production performance excellent product is to control the content of moisture in the bamboo wood powder.
3, the moulding of fine foaming wood plastic composite materials comprise nuclei of bubbles formation, grow up and the solidifying and setting three phases of abscess, wherein the formation stages of nuclei of bubbles is most important, selecting of little foaming nucleation agent is one of key factor that affects the micro-foaming material performance.One the foaming nucleation agent is dispersed bad in matrix slightly, thereby causes distribution of cells inhomogeneous, how to address these problems to optimize the processing condition of fine foaming wood plastic composite materials, realizes that effective control of microporous foam seems very important.
Summary of the invention
What the present invention will solve is the moisture that how to reduce or eliminate in the bamboo wood powder, improve the dispersiveness of little foaming nucleation agent in matrix, make its production that can be used for injection-molding wood plastic composite, improve that poor surface smoothness, intensity that existing wood plastic composite exists are low, fragility is large, can not injection moulding etc. problem.
The present invention adopts following technical scheme production injection grade fine foaming wood plastic composite materials:
1, pulverize batching: the bamboo waste log is ground into the 40-200 order, then it is sieved into the different components of 40-60 order, 60-80 order, 80-140 order and 140-200 order, (40-60 order) by weight: (60-80 order): (80-140 order): (140-200 order)=(10-35): (20-40): (10-20): (6-15) ratio matches the bamboo wood powder, controls simultaneously the tap density of bamboo wood powder at 0.2-0.5g/cm
3
2, modification: heat-treat through the employing microwave drying mode of bamboo wood powder under nitrogen protection of pulverizing batching, thermal treatment temp is 160-280 ℃, and the time is 0.5-12h, and preferred range is 190-230 ℃.
3, bamboo wood powder and the sorbent material after modification, plastics, coupling agent, whipping agent, frothing aid, pigment, compatilizer, lubricant, softening agent, reinforcing filler, mix and make mixture under high-speed stirring.The raw material that adds by weight, each component is: modified bamboo wood powder 20-70 part, sorbent material 0-10 part, plastics 20-60 part, coupling agent 0-10 part, whipping agent 0.5-5 part, frothing aid 0.5-3 part, pigment 1-3 part, compatilizer 1-10 part, lubricant 0.5-10 part, softening agent 0.5-10 part, reinforcing filler 0-30 part.
4, after first (1800-2800 rev/min) mixes 10-15 minute at a high speed with the sorbent material nano calcium oxide with wood powder.
5, after adding unclassified stores, above-mentioned material after at a high speed (1800-2800 rev/min), low speed (300-800 rev/min) mix 30-40 minute, 10-15 minute, is obtained mixture.
6, mixture is reacted and extrudes in twin screw extruder.The screw rod melt temperature is 150-200 ℃, and the residence time of mixture in screw rod is 8-15min.
7, after the material of extruding is cooling, through the dicing machine pelletizing, obtains pellet or through injection moulding, obtain injection grade fine foaming wood plastic composite materials.
Sorbent material of the present invention is that particle diameter is 200-400nm, and purity is greater than the nano calcium oxide of 98%wt.
Plastics of the present invention are polyethylene, polypropylene, polystyrene, polyvinyl chloride, polyethylene terephthalate or acrylonitrile-butadiene-styrene copolymer, and any one or the mixture of several arbitrary proportions wherein that comprise the plastics recovery material of above-mentioned plastics variety.
Coupling agent of the present invention is a kind of in silane coupling agent, titanate coupling agent or aluminate coupling agent or several arbitrary proportion mixture wherein.
Whipping agent of the present invention is sodium bicarbonate, Cellmic C 121,4, a kind of in 4 '-two-sulfonyl hydrazide phenyl ether or p-toluene sulfonylsemicarbazide or several arbitrary proportion mixture wherein.
Frothing aid of the present invention is a kind of in zinc oxide, zinc acetate, zinc carbonate, glycerine or Zinic stearas or several arbitrary proportion mixture wherein.
Lubricant of the present invention is a kind of in lipid acid and lipid, fatty acid acyl amine, metal soap, hydro carbons or silicon organic compound series lubricant agent or several arbitrary proportion mixture wherein.
Compatilizer of the present invention is maleic anhydride series, saturated acetic acid acid anhydride series, succinyl oxide is serial, butyryl oxide is serial or the serial compatilizer of stearic anhydride in a kind of or several arbitrary proportion mixture wherein.
Softening agent of the present invention is stearic acid or stearates, comprises a kind of in calcium stearate, barium stearate etc., diethyl phthalate, tributyl acetylcitrate, oxidic polyethylene, polyurethane plasticizer or Polyurethane Plasticizer or several arbitrary proportion mixture wherein.
Reinforcing filler of the present invention comprises common filling additive used in modifying plastics processing, and as calcium carbonate, talcum powder, kaolin, glass fibre, flyash, carbon black etc., preferable particle size is 5-30 μ m.
Except described above, use needs according to complete processing and product, the wood plastic composite of above-mentioned preparation can add some other auxiliary agents man-hour adding, as oxidation inhibitor, stablizer, whipping agent, fire retardant etc.
Can first by twin screw extruder, prepare the wood plastic composite pellet in the preparation method of wood plastic composite of the present invention, then adopt the injection moulding mode to carry out the forming process of wood plastic composite.
The present invention is a kind of raw-material treatment process for injection grade fine foaming wood plastic composite materials, and employing microwave drying bamboo wood powder and interpolation nano calcium oxide sorbent material reduce or eliminate the moisture in the bamboo wood powder.Improve the dispersiveness of little foaming nucleation agent in matrix by the thickness ratio of control bamboo wood powder and the tap density of bamboo wood powder, thereby improve performance and the quality that improves wood plastic composite.Its action principle and advantage are:
1, traditional bamboo wood powder drying means,, as flame, hot blast, steam, electrically heated etc., be the indirect heating drying, and after material Surface absorption heat, through thermal conduction, heat infiltrates into material inside, heats up immediately dry.The problems such as the dry easily generation of employing traditional drying method uneven drying is even.Microwave drying is to utilize hertzian wave as heating source, the material basis that is dried a kind of drying mode as heating element.Wet stock is in extremely short microwave high-frequency electric field period of oscillation, its inner water molecules can polarize and along the direction proper alignment of microwave electric field, then rotate with the mutual variation of high-frequency alternating direction of an electric field rapidly, and produce violent collision and friction (can reach p.s. more than one hundred million times), result part micro-wave energy is converted into the molecular motion energy, and with the form of heat, show, make the temperature of water raise and leave material, thereby make material obtain abundant drying.
2, dried bamboo wood powder at first separately and sorbent material nano calcium oxide high-speed mixing, utilizes the remaining micro-moisture in the good bamboo wood powder of the stronger water absorption character absorption dehydration of lime powder.Microwave drying is also added two measures of nano calcium oxide sorbent material and is carried out simultaneously substantially can reducing or eliminating moisture in the bamboo wood powder.In addition, generate calcium hydroxide after the calcium oxide suction, utilize its alkaline characteristic, can, with the dissolvings such as colloid on wood powder surface, improve consistency and interface binding power between wood powder and resin matrix.
3, the present invention adopts the collocation of bamboo wood powder thickness ratio, and after batch mixing, whole bamboo wood powder homogeneity is good, has avoided the phenomenon of bamboo wood powder appearance " bridging " or " frame branch " after the batch mixing, is conducive to little foaming nucleation agent dispersed in matrix.Controlling bamboo wood powder tap density can make the melting matrix material have better mobility, lower molding shrinkage and the modulus in flexure of Geng Gao.
Embodiment
Following specific examples is used for that the invention will be further described, rather than limits scope of the present invention.
Embodiment 1
1, pulverize batching: the bamboo waste log is ground into the 40-200 order, then it is sieved into the different components of 40-60 order, 60-80 order, 80-140 order and 140-200 order, in (40-60 order): (60-80 order): (80-140 order): (140-200 order)=30:40:15:15 ratio matches the bamboo wood powder, controls simultaneously the tap density of bamboo wood powder at 0.45g/cm
3
2, modification: heat-treat through the employing microwave drying mode of bamboo wood powder under nitrogen protection of pulverizing batching, thermal treatment temp is 200 ℃, and the time is 10h.
3, with 40 parts of bamboo wood powders after modification with after 5 parts of high speeds of sorbent material nano calcium oxide (2500 rev/mins) are mixed 12 minutes.Again by the following unclassified stores that is metered into: 50 parts, plastics, 2 parts of coupling agents, 3 parts of whipping agents, 1 part of frothing aid, 1.5 parts of pigment, 3 parts of compatilizers, 2 parts of lubricants, 3 parts, softening agent, 2 parts of reinforcing fillers.Above-mentioned material is obtained mixture through (2500 rev/mins) mixing 40 minutes at a high speed, low speed (600 rev/mins) mixing after 12 minutes.
4, mixture is reacted and extrudes in twin screw extruder.The screw rod melt temperature is 180 ℃, and the residence time of mixture in screw rod is 10min.
5, after the material of extruding is cooling, through the dicing machine pelletizing, obtains pellet or through injection moulding, obtain injection grade fine foaming wood plastic composite materials.
Embodiment 2
1, pulverize batching: the bamboo waste log is ground into the 40-200 order, then it is sieved into the different components of 40-60 order, 60-80 order, 80-140 order and 140-200 order, in (40-60 order): (60-80 order): (80-140 order): (140-200 order)=35:30:20:15 ratio matches the bamboo wood powder, controls simultaneously the tap density of bamboo wood powder at 0.4g/cm
3
2, modification: heat-treat through the employing microwave drying mode of bamboo wood powder under nitrogen protection of pulverizing batching, thermal treatment temp is 220 ℃, and the time is 8h.
3, with 45 parts of bamboo wood powders after modification with after 6 parts of high speeds of sorbent material nano calcium oxide (2600 rev/mins) are mixed 10 minutes.Again by the following unclassified stores that is metered into: 55 parts, plastics, 3 parts of coupling agents, 4 parts of whipping agents, 1.5 parts of frothing aids, 1.8 parts of pigment, 3.5 parts of compatilizers, 2.5 parts of lubricants, 3.5 parts, softening agent, 3 parts of reinforcing fillers.Above-mentioned material is obtained mixture through (2600 rev/mins) mixing 35 minutes at a high speed, low speed (500 rev/mins) mixing after 15 minutes.
4, mixture is reacted and extrudes in twin screw extruder.The screw rod melt temperature is 170 ℃, and the residence time of mixture in screw rod is 8min.
5, after the material of extruding is cooling, through the dicing machine pelletizing, obtains pellet or through injection moulding, obtain injection grade fine foaming wood plastic composite materials.
Injection grade fine foaming wood plastic composite materials all technical of the present invention all detects according to GB24137-2009, GB24508-2009 and other relevant criterion.
The detected result of embodiment 1-2 is as shown in table 1:
| Test item | Embodiment 1 | Embodiment 2 | Common wood plastic product |
| Tensile strength (MPa) | ≥11 | ≥10 | ≥6 |
| Flexural strength (MPa) | ≥12 | ≥11 | ≥9 |
| Bending elastic modulus (MPa) | ≥1680 | ≥1650 | ≥1300 |
| Compressive strength (MPa) | ≥32 | ≥35 | ≥28 |
| Shore hardness (D) | ≥65 | ≥63 | ≥55 |
| Relative density (g/cm 3) | 0.8-1.2 | 0.9-1.1 | 1.0-1.4 |
| Specific absorption (%) | 1-3 | 1-3 | 2-5 |
| Nail-holding ability (N) | ≥3500 | ≥3200 | ≥2600 |
| Heat-drawn wire (℃) | ≥100 | ≥100 | ≥100 |
Can find out through bamboo wood powder and the Compatibility in Plastics of modification better by upper table, the wood plastic composite properties of preparation is excellent.Extrude on complex-shaped mould with the particle that this formula is produced, the regular shape of hollow hole, molding shrinkage is little, good stability of the dimension.
Above demonstration and described ultimate principle of the present invention and principal character and advantage of the present invention.The technology of the industry should be understood; the present invention is not restricted to the described embodiments; that describes in above-described embodiment and specification sheets just illustrates principle of the present invention; without departing from the spirit and scope of the present invention; the present invention also has various changes and modifications, and these changes and improvements all fall in the claimed scope of the invention.The claimed scope of the present invention is by appending claims and equivalent circle thereof.
Claims (5)
1. raw-material treatment process that is used for injection grade fine foaming wood plastic composite materials is characterized in that: comprise the following steps:
(1) pulverize batching: the bamboo waste log is ground into the 40-200 order, then it is sieved into the different thicknesses powder, the thickness powder matches the bamboo wood powder in proportion;
(2) modification: heat-treat under nitrogen protection through the bamboo wood powder of pulverizing batching, thermal treatment temp is 160-280 ℃, and the time is 0.5-12h;
(3) mixing granulation: bamboo wood powder and sorbent material after modification, plastics, coupling agent, whipping agent, frothing aid, pigment, compatilizer, lubricant, softening agent, reinforcing filler, mix and make mixture under the high-speed stirring of 300-2800r/min; Mixture after the forcing machine extruding pelletization, is obtained injection grade fine foaming wood plastic composite materials.
2. the raw-material treatment process for injection grade fine foaming wood plastic composite materials according to claim 1, it is characterized in that: described bamboo waste log is ground into the 40-200 order, is sieved into the different components of 40-60 order, 60-80 order, 80-140 order and 140-200 order; Arrange in pairs or groups by following weight ratio: 40-60 order: 10-35 part, 60-80 order: 20-40 part, 80-140 order: 10-20 part, 140-200 order: 6-15 part.
3. a kind of raw-material treatment process for injection grade fine foaming wood plastic composite materials according to claim 1, is characterized in that the described bamboo wood powder that matches in proportion, and controlling bamboo wood powder tap density scope is 0.2-0.5g/cm
3
4. the raw-material treatment process for injection grade fine foaming wood plastic composite materials according to claim 1, is characterized in that described heat treated preferred range is 190-230 ℃.
5. the raw-material treatment process for injection grade fine foaming wood plastic composite materials according to claim 1, is characterized in that described thermal treatment employing microwave mode.
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| CN108727724A (en) * | 2017-04-21 | 2018-11-02 | 培恩特塔亚洲有限公司 | The application of composition, profiled part and profiled part |
| CN109971098A (en) * | 2019-04-28 | 2019-07-05 | 湖南恒信新型建材有限公司 | A kind of manufacturing method of bamboo and woods fiber circuit board |
| CN110079033A (en) * | 2019-05-29 | 2019-08-02 | 六盘水康博木塑科技有限公司 | A kind of high-intensity wood mould plate and preparation method thereof |
| CN110577752A (en) * | 2019-09-27 | 2019-12-17 | 安徽可尔海思塑业有限公司 | high-strength wood-plastic plate and preparation method thereof |
| CN110862609A (en) * | 2019-11-29 | 2020-03-06 | 湖南工业大学 | Composite material of polydisperse plant fiber reinforced polymer |
| US11884824B2 (en) * | 2019-04-15 | 2024-01-30 | Prisma Renewable Composites, Llc | Thermoplastic acrylonitrile containing copolymer/lignin blends |
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