CN103483838B - A kind of pretreatment process of wood powder - Google Patents

A kind of pretreatment process of wood powder Download PDF

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CN103483838B
CN103483838B CN201310364967.3A CN201310364967A CN103483838B CN 103483838 B CN103483838 B CN 103483838B CN 201310364967 A CN201310364967 A CN 201310364967A CN 103483838 B CN103483838 B CN 103483838B
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wood powder
silicone oil
low viscosity
powder
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CN103483838A (en
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薛杨
张冬海
刘海弟
吴镇江
陈运法
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Institute of Process Engineering of CAS
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    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L97/00—Compositions of lignin-containing materials
    • C08L97/02—Lignocellulosic material, e.g. wood, straw or bagasse
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27N—MANUFACTURE BY DRY PROCESSES OF ARTICLES, WITH OR WITHOUT ORGANIC BINDING AGENTS, MADE FROM PARTICLES OR FIBRES CONSISTING OF WOOD OR OTHER LIGNOCELLULOSIC OR LIKE ORGANIC MATERIAL
    • B27N1/00—Pretreatment of moulding material

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  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Polymers & Plastics (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Manufacturing & Machinery (AREA)
  • Forests & Forestry (AREA)
  • Compositions Of Macromolecular Compounds (AREA)
  • Chemical And Physical Treatments For Wood And The Like (AREA)
  • Dry Formation Of Fiberboard And The Like (AREA)
  • Processes Of Treating Macromolecular Substances (AREA)

Abstract

A kind of pretreatment process of wood powder.The method of the invention is passed into by the mixture of silicone oil with low viscosity and active silicone oil the three-phase circulating fluidized bed of wood powder is housed, and carries out modification to wood powder.According to wood powder prepared by the method for the invention, possess excellent hydrophobicity, anti-getting damp property, the Wood-plastic material excellent performance of preparation, compared with prior art, the present invention also have capable of circulation, environment-friendly high-efficiency, technique simple, be convenient to the advantages such as industrialization.

Description

A kind of pretreatment process of wood powder
Technical field
The present invention relates to wood processing field, particularly, the present invention relates to a kind of pretreatment process of wood powder.
Background technology
Wood plastic composite has the premium properties of timber and plastics concurrently due to it and its environmentally friendly and feature that is recoverable is widely used in every field, and the wood industry of moulding obtains and develops rapidly.Because lumber fibre surface exists a large amount of hydroxyls, so timber has very strong polarity, and the easy moisture absorption, and most of resin is all nonpolar or polarity is less, therefore both compound tense consistencies are bad, there is obvious phase interface, thus cause the mechanical property of wood plastic composite not good.And a large amount of hydroxyls forms intermolecular hydrogen bonding on lumber fibre surface, timber is made to be not easy to disperse in non-polar polymer matrix, in the preparation process of matrix material, lumber fibre is tending towards mutual gathering, form fibrous mass, bundle, cause the probability of stress concentration and generation defect to increase, also cause the decline of material mechanical performance.Therefore, improve the bonding interface of wood plastic composite, interfacial adhesion effect and the dispersiveness of wood materials in resin matrix of resolving wood materials and resin improve the key issue of wood plastic composite performance, and this is also the Focal point and difficult point of research at present.
At present, conventional wood powder pretreatment process mainly comprises physically modified and chemical modification.Physically modified comprises thermal treatment, alkaline purification, radiotreatment, discharge process, gas explosion process etc.; chemical process mainly carries out modification on xylon surface by carrying out acidylate, etherificate, graft copolymerization etc. to polar functional group; it is made to generate nonpolar chemical functional group and have mobility; make wood surface polarity similar to resin surface; to reduce the repellence between resin matrix and wooden material surface, reach the object improving interfacial adhesion.From effect, chemical modification is better than physically modified, but chemical modification is often complicated than physically modified.
CN1876724A discloses agricultural stalk base wood plastic composite materials and combined technical method.It is cured that raw material comprises plasticizing agricultural stalk powder particles material, thermoplastics, lubricant comprises dimethyl silicone oil, stearic acid and polyester, expanding material is acrylicstyrene-maleic anhydride alternate copolymer, softening agent is dioctyl phthalate (DOP), and fire retardant is red iron oxide.Its preparation method is by above-mentioned raw materials mixing and stirring, sends into forming machine and obtains section bar.But the method adopts conventional hybrid mode, auxiliary agent mixes even not with stalk powder and plastics, can affect the interfacial adhesion of Wood-plastic material, and gas-liquid-solid three-phase fluid bed wood powder and the silicone oil of making that the present invention adopts is fully mixed and modified, and the continuity of operation can be realized.
Therefore, exploitation a kind of capable of circulation, environment-friendly high-efficiency, technique simple, be convenient to industrialization, and the wood powder method of modifying that the modified wood powder prepared has excellent physicals and a mechanical property is the technical barrier in affiliated field.
Summary of the invention
For the deficiencies in the prior art, an object of the present invention is the pretreatment process providing a kind of wood powder, and it adopts silicone oil to carry out modification to wood powder, compared with prior art, have capable of circulation, environment-friendly high-efficiency, technique simple, be convenient to the advantages such as industrialization.
The pretreatment process of described wood powder comprises: silicone oil with low viscosity, active silicone oil and wood powder are fully mixed, obtain modified wood powder, and wherein, the viscosity of described silicone oil with low viscosity 25 DEG C is 0.5-40mPa.s.
Preferably, be blended in described in fluidized-bed and carry out; Preferably, described fluidized-bed is gas-liquid-solid three-phase fluid bed.
Preferably, the pretreatment process of described wood powder comprises: after the mixture preheating of silicone oil with low viscosity and active silicone oil, respectively at the bottom of tower and tower side introduce gas-liquid-solid three-phase fluid bed, wood powder is introduced gas-liquid-solid three-phase fluid bed from bottom, at the bottom of tower, pass into warm air carry out fluidisation, obtain modified wood powder, wherein, the viscosity of described silicone oil with low viscosity 25 DEG C is 0.5-40mPa.s.
Preferably, described wood powder is the combination of any a kind or at least 2 kinds in trees powder, sawdust powder, Wood waste powder, shell powder or farm crop powder.
In this article, described active silicone oil refers to the silicone oil with reactive behavior.
Preferably, the particle diameter of described wood powder is 10 ~ 150 orders, and more preferably 15 ~ 120 orders, are particularly preferably 20 ~ 100 orders; If the particle diameter of wood powder is greater than described size, namely need to pulverize it in advance.
Preferably, described wood powder water content <3wt%, such as 2.9wt%, 2.8wt%, 2.5wt%, 2wt%, 1.8wt%, 1.5wt%, 1.2wt%, 1wt%, 0.8wt%, 0.5wt%, 0.2wt%, 0.1wt% or 0.05wt% etc.; If its water content >=3wt%, so carries out drying to it with regard to needs before mixing with silicone oil with low viscosity and active silicone oil; Preferably, described drying temperature is 50 ~ 150 DEG C, more preferably 70 ~ 130 DEG C, is particularly preferably 80 ~ 120 DEG C; Preferably, described time of drying is at least 0.5h, more preferably 0.8 ~ 6h, is particularly preferably 1 ~ 4h; Preferably, described drying is carried out in an oven.
Preferably, described silicone oil with low viscosity is the combination of any a kind or at least 2 kinds in polydimethylsiloxane, cyclopentasiloxane, cyclohexasiloxane, ring decamethylcyclopentaandoxane or ring ten diformazan basic ring six siloxanes.
Preferably, described silicone oil with low viscosity is low viscosity volatile silicone oils; Preferably, the viscosity of described low viscosity volatile silicone oils 25 DEG C is 1-27mPa.s; Preferably, the boiling point of described low viscosity volatile silicone oils is 200-300 DEG C, particularly preferably 220-270 DEG C.
The example of described silicone oil with low viscosity is as DOW CORNING pMX-0245, pMX-0246, pMX-0345, 2945, SHIN-ETSU HANTOTAI KF-96L, KF-995, watt gram AK10, Toshiba GE-9981 etc.
Preferably, described active silicone oil is amido silicon oil and/or hydroxy silicon oil; Preferably, the amino content of described amido silicon oil is 0.2-1.65wt%, particularly preferably 0.37-1.5wt%; Preferably, the hydroxy radical content of described hydroxy silicon oil is 2-16wt%, particularly preferably 2.5-7wt%.
Preferably, described activated silica oil viscosity is 38-120mPa.s, further preferred 45-100mPa.s, particularly preferably 50-75mPa.s.
Amido silicon oil specific product is as DOW CORNING oFX-8040, oFX-8630, oFX-8803, oFX-8813, oFX-8822 etc.; Hydroxy silicon oil specific product is as DOW CORNING pMX-0156, pMX-0930 etc.
Preferably, the volume ratio of described silicone oil with low viscosity and active silicone oil is 0.2:1-6:1, particularly preferably 0.5:1-4.5:1.
Preferably, the total amount of described silicone oil with low viscosity and active silicone oil and the mass ratio of wood powder are 0.001:1-0.01:1, particularly preferably 0.003:1-0.006:1.
Gas, liquid, solid three-phase in described gas-liquid-solid three-phase circulating fluidized bed is respectively air, silicon oil mixture and wood powder.
Preferably, in described gas-liquid-solid three-phase circulating fluidized bed, gas flow rate is 0.0100-2.1300m/s, further preferred 0.0250-1.8500m/s, particularly preferably 0.0410-1.2000m/s.
Preferably, the temperature after the mixture preheating of described silicone oil with low viscosity and active silicone oil is 80 ~ 150 DEG C, more preferably 90 ~ 130 DEG C, particularly preferably 100-120 DEG C.
Preferably, the temperature of described warm air is 50 ~ 110 DEG C, more preferably 55 ~ 100 DEG C, particularly preferably 60-95 DEG C.
Preferably, the described fluidization treatment time is 10-95 minute, particularly preferably 15-50 minute.
Preferably, modified wood powder is mixed with plastic powder and extrude, granulation, finally compacting or injection moulding; Preferably, described mixing time is at least 4min, more preferably 5 ~ 25min, is particularly preferably 5 ~ 15min; Preferably, be blended in described in high-speed mixer and carry out; Describedly extrude employing twin screw extruder; Preferably, the temperature of screw rod is 140 DEG C-220 DEG C, and screw speed is 12-250r/min, and rate of feeding is 10-57r/min, and pelletizing speed is 60-160r/min.
Preferably, the pretreatment process of described wood powder comprises the following steps:
(1) pulverized and sieved by wood powder, particle diameter is 10 ~ 150 orders, then by wood powder 50 ~ 150 DEG C of dryings at least 0.5h to water content <3wt%;
(2) after the mixture of silicone oil with low viscosity and active silicone oil being preheated to 80 ~ 150 DEG C, respectively at the bottom of tower and tower side introduce gas-liquid-solid three-phase fluid bed, (1) wood powder described in is introduced gas-liquid-solid three-phase fluid bed from bottom, the warm air that temperature is 50 ~ 110 DEG C is passed at the bottom of tower, fluidisation 10-95 minute, obtains modified wood powder; Wherein, the volume ratio of silicone oil with low viscosity and active silicone oil is 0.2:1-6:1, and the weight ratio of silicon oil mixture and wood powder is 0.001:1-0.01:1, and control gas flow rate is 0.0100-2.1300m/s.
Two of object of the present invention is to provide a kind of modified wood powder, and described modified wood powder is prepared by the method for the invention.
According to wood powder prepared by the method for the invention, contact angle is greater than 100 ° after tested, 300h rate of moisture absorption is less than 2%, illustrate that it modifiedly possesses excellent hydrophobicity and anti-performance of getting damp, compared with prior art, the present invention also have capable of circulation, environment-friendly high-efficiency, technique simple, be convenient to the advantages such as industrialization.
Embodiment
For ease of understanding the present invention, it is as follows that the present invention enumerates embodiment.Those skilled in the art should understand, described embodiment is only help to understand the present invention, should not be considered as concrete restriction of the present invention.
In following embodiment, following methods is adopted to carry out performance test to modified wood powder:
The wood powder hydrophobic performance after process is measured: by wood powder tabletted on powder compressing machine with German Kruss company DSA100 static contact angle determinator, pressure is 20MPa, pressurize 5min, forms the uniform thin rounded flakes of thickness, measures the contact angle of water droplet on wood powder compressing tablet.
According to wood powder prepared by the method for the invention, after twin-screw extrusion, wood plastic composite is obtained with plastics powder, repressed or the injection moulding of granulation, its flexural strength measures according to GB/T9341-2008, Young's modulus test measures according to GB/T17657-1999, tensile property test measures according to GB/T1040-92, and shock strength measures according to GB/T1043.1-2008, and hardness test measures according to GB9342-88.
Hygroscopic property is tested: put into by wood plastic composite test specimen on climatic chamber inner jar dividing plate, takes out claim quality, according to calculating rate of moisture absorption of poor quality by humidity exposure time 300h.
Embodiment 1
First with pulverizing mill, wood powder is crushed to 100 orders, then wood powder is put into 110 DEG C of dry 1h(water content <3wt% of baking oven), be then cooled to 40 DEG C.By silicone oil with low viscosity pMX-0244 and amido silicon oil oFX-8040 mixes according to 0.2:1 (V/V), after being preheated to 100 DEG C, respectively at the bottom of tower and tower side introduce gas-liquid-solid three-phase fluid bed, wood powder is according to silicon oil mixture: wood powder weight ratio 0.001:1 introduces gas-liquid-solid three-phase fluid bed from bottom, at the bottom of tower, pass into temperature is that the warm air of 60 DEG C carries out fluidisation, control gas flow rate is 0.0100m/s, and the treatment time is 15 minutes, obtains modified wood powder.Modified wood powder is mixed 5min with PE powder in high-speed mixer, and then by batch mixing reactive extrursion in twin screw extruder, the temperature arranging screw rod is 220 DEG C, and screw speed is 25r/min, and rate of feeding is 57r/min, and pelletizing speed is 160r/min; Through compacting or injection moulding after the composite cools down granulation of extruding.
Modified wood powder tabletted, measuring the contact angle of water droplet on wood powder compressing tablet is 103.05 °, and the tensile strength of the wood plastic composite obtained is 42.8MPa, and shock strength is 6.2kJ/m 2, flexural strength is 51.7MPa, Young's modulus 1954.45MPa, and hardness is 43.1, and rate of moisture absorption is 1.5%.
Embodiment 2
First with pulverizing mill, wood powder is crushed to 40 orders, then wood powder is put into 80 DEG C of dry 4h(water content <3wt% of baking oven), be then cooled to 30 DEG C.By silicone oil with low viscosity pMX-0246 and amido silicon oil oFX-8630 mixes according to 6:1 (V/V), after being preheated to 120 DEG C, respectively at the bottom of tower and tower side introduce gas-liquid-solid three-phase fluid bed, wood powder is according to silicon oil mixture: wood powder weight ratio 0.01:1 introduces gas-liquid-solid three-phase fluid bed from bottom, at the bottom of tower, pass into temperature is that the warm air of 70 DEG C carries out fluidisation, control gas flow rate is 1.2000m/s, and the treatment time is 30 minutes, obtains modified wood powder.Modified wood powder is mixed 15min with PP powder in high-speed mixer, and then by batch mixing reactive extrursion in twin screw extruder, the temperature arranging screw rod is 200 DEG C, and screw speed is 12r/min, and rate of feeding is 10r/min, and pelletizing speed is 60r/min; Through compacting or injection moulding after the composite cools down granulation of extruding.
Modified wood powder tabletted, measuring the contact angle of water droplet on wood powder compressing tablet is 134.73 °, and the tensile strength of the wood plastic composite obtained is 53.3MPa, and shock strength is 8.4kJ/m 2, flexural strength is 74.9MPa, Young's modulus 2107.36MPa, and hardness is 33.5, and rate of moisture absorption is 0.4%.
Embodiment 3
First with pulverizing mill, wood powder is crushed to 80 orders, then wood powder is put into 90 DEG C of dry 2h(water content <3wt% of baking oven), be then cooled to 40 DEG C.By silicone oil with low viscosity pMX-0245 and hydroxy silicon oil pMX-0156 mixes according to 0.2:1 (V/V), after being preheated to 110 DEG C, respectively at the bottom of tower and tower side introduce gas-liquid-solid three-phase fluid bed, wood powder is according to silicon oil mixture: wood powder weight ratio 0.003:1 introduces gas-liquid-solid three-phase fluid bed from bottom, at the bottom of tower, pass into temperature is that the warm air of 80 DEG C carries out fluidisation, control gas flow rate is 2.1300m/s, and the treatment time is 45 minutes, obtains modified wood powder.Modified wood powder is mixed 10min with PVC powder in high-speed mixer, and then by batch mixing reactive extrursion in twin screw extruder, the temperature arranging screw rod is 140 DEG C, and screw speed is 20r/min, and rate of feeding is 30r/min, and pelletizing speed is 80r/min; Through compacting or injection moulding after the composite cools down granulation of extruding.
Modified wood powder tabletted, measuring the contact angle of water droplet on wood powder compressing tablet is 110.92 °, and the tensile strength of the wood plastic composite obtained is 62.4MPa, and shock strength is 9.7kJ/m 2, flexural strength is 73.2MPa, Young's modulus 2454.38MPa, and hardness is 51.8, and rate of moisture absorption is 1.2%.
Embodiment 4
First with pulverizing mill, wood powder is crushed to 60 orders, then wood powder is put into 100 DEG C of dry 1.5h(water content <3wt% of baking oven), be then cooled to 30 DEG C.By silicone oil with low viscosity pMX-0344 and hydroxy silicon oil pMX-0930 mixes according to 3:1 (V/V), after being preheated to 105 DEG C, respectively at the bottom of tower and tower side introduce gas-liquid-solid three-phase fluid bed, wood powder is according to silicon oil mixture: wood powder weight ratio 0.006:1 introduces gas-liquid-solid three-phase fluid bed from bottom, at the bottom of tower, pass into temperature is that the warm air of 90 DEG C carries out fluidisation, control gas flow rate is 0.0410m/s, and the treatment time is 25 minutes, obtains modified wood powder.Modified wood powder is mixed 7min with PS powder in high-speed mixer, and then by batch mixing reactive extrursion in twin screw extruder, the temperature arranging screw rod is 190 DEG C, and screw speed is 60r/min, and rate of feeding is 57r/min, and pelletizing speed is 110r/min; Through compacting or injection moulding after the composite cools down granulation of extruding.
Modified wood powder tabletted, measuring the contact angle of water droplet on wood powder compressing tablet is 113.06 °, and the tensile strength of the wood plastic composite obtained is 45.1MPa, and shock strength is 5.7kJ/m 2, flexural strength is 59.3MPa, Young's modulus 2954.38MPa, and hardness is 39.2, and rate of moisture absorption is 1.0%.
Embodiment 5
First with pulverizing mill, wood powder is crushed to 90 orders, then wood powder is put into 105 DEG C of dry 2h(water content <3wt% of baking oven), be then cooled to 40 DEG C.By silicone oil with low viscosity and amido silicon oil PMX-0345(217) oFX-8803 according to 1.7:1 (V/V), respectively at the bottom of tower and tower side introduce, introduce gas-liquid-solid three-phase fluid bed with wood powder according to weight ratio 0.005:1, control gas flow rate is 1.8500m/s, and the treatment time is 50 minutes, obtains modified wood powder.Modified wood powder is mixed 13min with PS powder in high-speed mixer, and then by batch mixing reactive extrursion in twin screw extruder, the temperature arranging screw rod is 180 DEG C, and screw speed is 40r/min, and rate of feeding is 35r/min, and pelletizing speed is 70r/min; Through compacting or injection moulding after the composite cools down granulation of extruding.
Modified wood powder tabletted, measuring the contact angle of water droplet on wood powder compressing tablet is 129.40 °, and the tensile strength of the wood plastic composite obtained is 48.8MPa, and shock strength is 7.1kJ/m 2, flexural strength is 65.7MPa, Young's modulus 1762.14MPa, and hardness is 53.6, and rate of moisture absorption is 0.7%.
Embodiment 6
First with pulverizing mill, wood powder is crushed to 50 orders, then wood powder is put into 85 DEG C of dry 3h(water content <3wt% of baking oven), be then cooled to 30 DEG C.By silicone oil with low viscosity KF-96L and amido silicon oil oFX-8813 mixes according to 0.5:1 (V/V), after being preheated to 115 DEG C, respectively at the bottom of tower and tower side introduce gas-liquid-solid three-phase fluid bed, wood powder is according to silicon oil mixture: wood powder weight ratio 0.004:1 introduces gas-liquid-solid three-phase fluid bed from bottom, at the bottom of tower, pass into temperature is that the warm air of 95 DEG C carries out fluidisation, control gas flow rate is 0.0250m/s, and the treatment time is 40 minutes, obtains modified wood powder.Modified wood powder is mixed 15min with ABS powder in high-speed mixer, then by batch mixing reactive extrursion in twin screw extruder, the temperature arranging screw rod is 210 DEG C, and screw speed is 12-250r/min, rate of feeding is 10-57r/min, and pelletizing speed is 60-160r/min; Through compacting or injection moulding after the composite cools down granulation of extruding.
Modified wood powder tabletted, measuring the contact angle of water droplet on wood powder compressing tablet is 106.10 °, and the tensile strength of the wood plastic composite obtained is 67.7MPa, and shock strength is 12.4kJ/m 2, flexural strength is 98.5MPa, Young's modulus 3325.11MPa, and hardness is 54.8, and rate of moisture absorption is 1.1%.
Embodiment 7
First with pulverizing mill, wood powder is crushed to 70 orders, then wood powder is put into 95 DEG C of dry 2.5h(water content <3wt% of baking oven), be then cooled to 40 DEG C.By silicone oil with low viscosity 2945(200) and amido silicon oil oFX-8822 mixes according to 4.5:1 (V/V), after being preheated to 107 DEG C, respectively at the bottom of tower and tower side introduce gas-liquid-solid three-phase fluid bed, wood powder is according to silicon oil mixture: wood powder weight ratio 0.007:1 introduces gas-liquid-solid three-phase fluid bed from bottom, at the bottom of tower, pass into temperature is that the warm air of 85 DEG C carries out fluidisation, control gas flow rate is 0.1300m/s, and the treatment time is 35 minutes, obtains modified wood powder.Modified wood powder is mixed 8min with PET powder in high-speed mixer, and then by batch mixing reactive extrursion in twin screw extruder, the temperature arranging screw rod is 210 DEG C, and screw speed is 50r/min, and rate of feeding is 27r/min, and pelletizing speed is 90r/min; Through compacting or injection moulding after the composite cools down granulation of extruding.
Modified wood powder tabletted, measuring the contact angle of water droplet on wood powder compressing tablet is 115.56 °, and the tensile strength of the wood plastic composite obtained is 53.6MPa, and shock strength is 8.2kJ/m 2, flexural strength is 65.3MPa, Young's modulus 2497.12MPa, and hardness is 45.9, and rate of moisture absorption is 0.9%.
Embodiment 8
First with pulverizing mill, wood powder is crushed to 10 orders, then wood powder is put into 150 DEG C of dry 0.5h(water content <3wt% of baking oven), be then cooled to 40 DEG C.By silicone oil with low viscosity 2945(200) and amido silicon oil oFX-8822 mixes according to 0.5:1 (V/V), after being preheated to 80 DEG C, respectively at the bottom of tower and tower side introduce gas-liquid-solid three-phase fluid bed, wood powder is according to silicon oil mixture: wood powder weight ratio 0.007:1 introduces gas-liquid-solid three-phase fluid bed from bottom, at the bottom of tower, pass into temperature is that the warm air of 50 DEG C carries out fluidisation, control gas flow rate is 0.0200m/s, and the treatment time is 75 minutes, obtains modified wood powder.Modified wood powder is mixed 4min with PET powder in high-speed mixer, and then by batch mixing reactive extrursion in twin screw extruder, the temperature arranging screw rod is 200 DEG C, and screw speed is 15r/min, and rate of feeding is 12r/min, and pelletizing speed is 130r/min; Through compacting or injection moulding after the composite cools down granulation of extruding.
Modified wood powder tabletted, measuring the contact angle of water droplet on wood powder compressing tablet is 102.16 °, and the tensile strength of the wood plastic composite obtained is 49.1MPa, and shock strength is 7.5kJ/m 2, flexural strength is 60.9MPa, Young's modulus 2318.63MPa, and hardness is 37.2, and rate of moisture absorption is 1.6%.
Embodiment 9
First with pulverizing mill, wood powder is crushed to 150 orders, then wood powder is put into 50 DEG C of dry 10h(water content <3wt% of baking oven), be then cooled to 40 DEG C.By silicone oil with low viscosity 2945(200) and amido silicon oil oFX-8822 mixes according to 5:1 (V/V), after being preheated to 150 DEG C, respectively at the bottom of tower and tower side introduce gas-liquid-solid three-phase fluid bed, wood powder is according to silicon oil mixture: wood powder weight ratio 0.002:1 introduces gas-liquid-solid three-phase fluid bed from bottom, at the bottom of tower, pass into temperature is that the warm air of 110 DEG C carries out fluidisation, control gas flow rate is 2.0000m/s, and the treatment time is 25 minutes, obtains modified wood powder.Modified wood powder is mixed 10min with PET powder in high-speed mixer, and then by batch mixing reactive extrursion in twin screw extruder, the temperature arranging screw rod is 180 DEG C, and screw speed is 180r/min, and rate of feeding is 45r/min, and pelletizing speed is 70r/min; Through compacting or injection moulding after the composite cools down granulation of extruding.
Modified wood powder tabletted, measuring the contact angle of water droplet on wood powder compressing tablet is 100.43 °, and the tensile strength of the wood plastic composite obtained is 45.2MPa, and shock strength is 6.8kJ/m 2, flexural strength is 54.7MPa, Young's modulus 2293.05MPa, and hardness is 38.6, and rate of moisture absorption is 1.9%.
It should be noted that and understand, when not departing from the spirit and scope of the present invention required by accompanying claim, various amendment and improvement can be made to the present invention of foregoing detailed description.Therefore, the scope of claimed technical scheme is not by the restriction of given any specific exemplary teachings.
Applicant states, the present invention illustrates detailed process equipment and process flow process of the present invention by above-described embodiment, but the present invention is not limited to above-mentioned detailed process equipment and process flow process, namely do not mean that the present invention must rely on above-mentioned detailed process equipment and process flow process and could implement.Person of ordinary skill in the field should understand, any improvement in the present invention, to equivalence replacement and the interpolation of ancillary component, the concrete way choice etc. of each raw material of product of the present invention, all drops within protection scope of the present invention and open scope.

Claims (51)

1. a pretreatment process for wood powder, comprising: silicone oil with low viscosity, active silicone oil and wood powder are fully mixed, obtain modified wood powder, and wherein, the viscosity of described silicone oil with low viscosity 25 DEG C is 0.5-40mPa.s; The volume ratio of described silicone oil with low viscosity and active silicone oil is 0.2:1-6:1.
2. the method for claim 1, it is characterized in that, the pretreatment process of described wood powder comprises: after the mixture preheating of silicone oil with low viscosity and active silicone oil, respectively at the bottom of tower and tower side introduce gas-liquid-solid three-phase fluid bed, wood powder is introduced gas-liquid-solid three-phase fluid bed from bottom, pass into warm air and carry out fluidisation, obtain modified wood powder at the bottom of tower, wherein, the viscosity of described silicone oil with low viscosity 25 DEG C is 0.5-40mPa.s.
3. method as claimed in claim 1 or 2, is characterized in that, described wood powder is the combination of any a kind or at least 2 kinds in trees powder, sawdust powder, Wood waste powder, shell powder or farm crop powder.
4. method as claimed in claim 1 or 2, it is characterized in that, the particle diameter of described wood powder is 10 ~ 150 orders.
5. method as claimed in claim 4, it is characterized in that, the particle diameter of described wood powder is 15 ~ 120 orders.
6. method as claimed in claim 4, it is characterized in that, the particle diameter of described wood powder is 20 ~ 100 orders.
7. method as claimed in claim 1 or 2, is characterized in that, described wood powder water content <3wt%.
8. method as claimed in claim 1 or 2, is characterized in that, if described wood powder water content >=3wt%, carry out drying to it.
9. method as claimed in claim 8, it is characterized in that, described drying temperature is 50 ~ 150 DEG C.
10. method as claimed in claim 9, it is characterized in that, described drying temperature is 70 ~ 130 DEG C.
11. methods as claimed in claim 9, it is characterized in that, described drying temperature is 80 ~ 120 DEG C.
12. methods as claimed in claim 8, is characterized in that, described time of drying is at least 0.5h.
13. methods as claimed in claim 12, it is characterized in that, described time of drying is 0.8 ~ 6h.
14. methods as claimed in claim 12, it is characterized in that, described time of drying is 1 ~ 4h.
15. methods as claimed in claim 8, it is characterized in that, described drying is carried out in an oven.
16. methods as claimed in claim 1 or 2, it is characterized in that, described silicone oil with low viscosity is the combination of any a kind or at least 2 kinds in polydimethylsiloxane, cyclopentasiloxane, cyclohexasiloxane, ring decamethylcyclopentaandoxane or ring ten diformazan basic ring six siloxanes.
17. methods as claimed in claim 1 or 2, is characterized in that, described silicone oil with low viscosity is low viscosity volatile silicone oils.
18. methods as claimed in claim 17, is characterized in that, the viscosity of described low viscosity volatile silicone oils 25 DEG C is 1-27mPa.s.
19. methods as claimed in claim 17, is characterized in that, the boiling point of described low viscosity volatile silicone oils is 200-300 DEG C.
20. methods as claimed in claim 19, is characterized in that, the boiling point of described low viscosity volatile silicone oils is 220-270 DEG C.
21. methods as claimed in claim 1 or 2, it is characterized in that, described active silicone oil is amido silicon oil and/or hydroxy silicon oil.
22. methods as claimed in claim 21, is characterized in that, the amino content of described amido silicon oil is 0.2-1.65wt%.
23. methods as claimed in claim 22, is characterized in that, the amino content of described amido silicon oil is 0.37-1.5wt%.
24. methods as claimed in claim 21, is characterized in that, the hydroxy radical content of described hydroxy silicon oil is 2-16wt%.
25. methods as claimed in claim 24, is characterized in that, the hydroxy radical content of described hydroxy silicon oil is particularly preferably 2.5-7wt%.
26. methods as claimed in claim 1 or 2, it is characterized in that, described activated silica oil viscosity is 38-120mPa.s.
27. methods as claimed in claim 26, it is characterized in that, described activated silica oil viscosity is 45-100mPa.s.
28. methods as claimed in claim 26, it is characterized in that, described activated silica oil viscosity is 50-75mPa.s.
29. methods as claimed in claim 1 or 2, is characterized in that, the volume ratio of described silicone oil with low viscosity and active silicone oil is 0.5:1-4.5:1.
30. methods as claimed in claim 1 or 2, it is characterized in that, the total amount of described silicone oil with low viscosity and active silicone oil and the mass ratio of wood powder are 0.001:1-0.01:1.
31. methods as claimed in claim 30, it is characterized in that, the total amount of described silicone oil with low viscosity and active silicone oil and the mass ratio of wood powder are 0.003:1-0.006:1.
32. methods as claimed in claim 2, it is characterized in that, in described gas-liquid-solid three-phase circulating fluidized bed, gas flow rate is 0.0100-2.1300m/s.
33. methods as claimed in claim 32, it is characterized in that, in described gas-liquid-solid three-phase circulating fluidized bed, gas flow rate is 0.0250-1.8500m/s.
34. methods as claimed in claim 32, it is characterized in that, in described gas-liquid-solid three-phase circulating fluidized bed, gas flow rate is 0.0410-1.2000m/s.
35. methods as claimed in claim 2, it is characterized in that, the temperature after the mixture preheating of described silicone oil with low viscosity and active silicone oil is 80 ~ 150 DEG C.
36. methods as claimed in claim 35, it is characterized in that, the temperature after the mixture preheating of described silicone oil with low viscosity and active silicone oil is 90 ~ 130 DEG C.
37. methods as claimed in claim 35, it is characterized in that, the temperature after the mixture preheating of described silicone oil with low viscosity and active silicone oil is 100-120 DEG C.
38. methods as claimed in claim 2, is characterized in that, the temperature of described warm air is 50 ~ 110 DEG C.
39. methods as claimed in claim 38, is characterized in that, the temperature of described warm air is 55 ~ 100 DEG C.
40. methods as claimed in claim 38, is characterized in that, the temperature of described warm air is 60-95 DEG C.
41. methods as claimed in claim 2, it is characterized in that, the described fluidization treatment time is 10-95 minute.
42. methods as claimed in claim 41, it is characterized in that, the described fluidization treatment time is 15-50 minute.
43. methods as claimed in claim 1 or 2, it is characterized in that, the pretreatment process of described wood powder comprises the following steps:
(1) pulverized and sieved by wood powder, particle diameter is 10 ~ 150 orders, then by wood powder 50 ~ 150 DEG C of dryings at least 0.5h to water content <3wt%;
(2) after the mixture of silicone oil with low viscosity and active silicone oil being preheated to 80 ~ 150 DEG C, respectively at the bottom of tower and tower side introduce gas-liquid-solid three-phase fluid bed, (1) wood powder described in is introduced gas-liquid-solid three-phase fluid bed from bottom, the warm air that temperature is 50 ~ 110 DEG C is passed at the bottom of tower, fluidisation 10-95 minute, obtains modified wood powder; Wherein, the volume ratio of silicone oil with low viscosity and active silicone oil is 0.2:1-6:1, and the weight ratio of silicon oil mixture and wood powder is 0.001:1-0.01:1, and control gas flow rate is 0.0100-2.1300m/s.
44. methods as claimed in claim 1 or 2, is characterized in that, modified wood powder is mixed with plastic powder and extrude, granulation, finally compacting or injection moulding.
45. methods as claimed in claim 44, is characterized in that, described mixing time is at least 4min.
46. methods as claimed in claim 44, it is characterized in that, described mixing time is 5 ~ 25min.
47. methods as claimed in claim 44, it is characterized in that, described mixing time is 5 ~ 15min.
48. methods as claimed in claim 44, is characterized in that, described in be blended in high-speed mixer and carry out.
49. methods as claimed in claim 44, is characterized in that, described in extrude employing twin screw extruder.
50. methods as claimed in claim 49, is characterized in that, the temperature of screw rod is 140 DEG C-220 DEG C, and screw speed is 12-250r/min, and rate of feeding is 10-57r/min, and pelletizing speed is 60-160r/min.
51. 1 kinds of modified wood powders, is characterized in that, described modified wood powder is prepared by method described in any one of claim 1-50.
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