CN102634211A - Rice hull-hot melt adhesive composite powder for selective laser sintering and preparation method thereof - Google Patents
Rice hull-hot melt adhesive composite powder for selective laser sintering and preparation method thereof Download PDFInfo
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Abstract
A rice hull-hot melt adhesive composite powder for selective laser sintering and a preparation method thereof relate to a composite powder for selective laser sintering and a preparation method thereof. The invention chooses rice hull powder as main material for the composite powder for selective laser sintering, so that the production cost of the wood-plastic composite material can be greatly reduced, moreover, in the process of preparing the rice hull-hot melt adhesive composite powder for selective laser sintering, the rice hull powder does not need to be modified in a large quantity, consequently, the production cost is reduced, and moreover, while various properties of the wood-plastic composite material are guaranteed, the process is simplified. The rice hull-hot melt adhesive composite powder for selective laser sintering is prepared from hot melt adhesive powder, the dried rice hull powder, light stabilizer, coupling agent, initiator and organic filler. The preparation method includes the following steps of: (1) rice hull powder drying; (2) base stock preparation; and (3) high-rotation speed mixing. The invention is used in the preparation of the wood-plastic composite material.
Description
Technical field
The present invention relates to a kind of selective laser sintering composite powder and preparation method thereof.
Background technology
Rice husk is the sub product after the rice processing, and China is again that paddy rice is mainly planted country, so the rice husk source is abundant, has cheap advantage.According to statistical yearbooks in 2011 of China National Bureau of Statistics of China issue, the rice yield of China in 2010 is about 1.95 hundred million tons, has 25% rice husk rate to calculate according to minimum, and the rice husk output of China in 2010 reaches at least 4,875 ten thousand tons.
The method that Traditional use material removing method reaches part shape and precision has thoroughly been overturned in the rapid prototyping manufacturing, adopts brand-new " increasing material " mode job.Rapid prototyping technology provides true visible solid model for shortening New Product's Design assessment cycle to planner, mfr and user, carries out the function test experiment, carries out fast mould manufacturing and part manufacturing fast, and is significant.Rapid prototyping is manufactured on fields such as automobile, aviation, electrical equipment, medical treatment and is used widely.
Selective laser sintering (SLS) is a kind of of rapid prototyping manufacturing; Adopt laser apparatus to make the energy; Its working process is: the 3D solid cad model of at first in computingmachine, setting up part; Carry out slicing treatment with delamination software, obtain the information of each processing aspect, and be converted into electrical signal and control laser scanning system.The even very thin work material powder of layer overlay on worktable; Laser beam carries out sintering according to part layering profile selectively under computer control; By the work material powder smelting of laser beam irradiation and in process of cooling subsequently, bond together, just accomplished the processing of an aspect; Successively spread powder, successively scan sintering, the processing up to accomplishing last one deck produces three-dimensional entity model.All sintering remove the excessive processing material powder after intact, polish, subsequent disposal such as oven dry just obtains component again.This technology have the work material range of choice extensively, excess stock is easy to cleaning, advantages of wide application range, is applicable to the manufacturing of prototype and function part.
But because rice husk is surperficial jagged, extremely rough, be easy to generate jam, bridging between particle, mobile poor, belong to and be difficult for the fluidizing medium, and moisture is big in the rice husk, low molecule organic matter is many, thus cause its poor heat stability, and have water absorbability.Therefore, think that rice husk and powdered rice hulls are not suitable for selective laser sintering, perhaps can only add as auxiliary material.For example; " PVC/ powdered rice hulls composite structure and performance study " (Wuhan University of Technology; Application Doctor of engineering academic dissertation, postgraduate Hu Shengfei, instructor Chen Wen) select rice husk to use in the literary composition as selective laser sintering composite powder auxiliary material; And carry out the microwave induced modification of MMA for the water absorbability that reduces rice husk, simultaneously to also powdered rice hulls having been carried out the performance that a series of modification improves its each side.
Summary of the invention
The present invention selects powdered rice hulls as selective laser sintering composite powder main raw material; Can significantly reduce the production cost of wood plastic composite; And selective laser sintering of the present invention needn't carry out a large amount of modifications with rice husk hot melt adhesive composite powder to powdered rice hulls in the preparation process; Not only reduce production cost, and when guaranteeing wood plastic composite each item performance, simplified technology.
Selective laser sintering with rice husk hot melt adhesive composite powder by the hot melt adhesive powder, process through rice husk powder, photostabilizer, coupling agent, initiator and the organic filler of drying treatment; Wherein the hot melt adhesive powder is 5～3: 1 with weight ratio through the rice husk powder of drying treatment; Coupling agent be the hot melt adhesive powder with through 1%～5% of the rice husk powder total mass of drying treatment; Initiator be the hot melt adhesive powder with through 0.1%～2% of the rice husk powder total mass of drying treatment; Organic filler be the hot melt adhesive powder with through 2%～20% of the rice husk powder total mass of drying treatment, photostabilizer be the hot melt adhesive powder with through 0.2%～6% of the rice husk powder total mass of drying treatment; Organic filler is polypropylene powder or polyethylene powders.
Above-mentioned selective laser sintering prepares with the preparation method of rice husk hot melt adhesive composite powder according to the following steps: one, powdered rice hulls heat drying treatment; With powdered rice hulls under 140 ℃ of conditions dry 5 hours; And every separated 2h stirs once in the drying process, promptly obtains the rice husk powder through drying treatment; Two, will mix through the rice husk powder and the hot melt adhesive powder of drying treatment by hot melt adhesive powder and weight ratio through the rice husk powder 5～3: 1 of drying treatment; The acetone soln that will be dissolved with coupling agent and initiator is afterwards poured into; Continue to stir, obtain base-material; Three, base-material is dried in 45 ± 2 ℃ of environment; Then in hot melt adhesive powder and ratio through the rice husk powder total mass 2%～20% of drying treatment add organic filler, by hot melt adhesive powder and ratio adding photostabilizer through the rice husk powder total mass 0.2%～6% of drying treatment; And be to mix under 720～1440r/min condition at rotating speed, promptly obtain selective laser sintering with rice husk hot melt adhesive composite powder; Be the hot melt adhesive powder in coupling agent in the step 2 wherein and rice husk powder total mass 1%～5%, initiator through drying treatment is the hot melt adhesive powder and ratio through the rice husk powder total mass 0.1%～2% of drying treatment is dissolved in acetone with coupling agent and initiator; Organic filler is polypropylene powder or polyethylene powders in the step 3.
The present invention prepare selective laser sintering with in the step 1 of rice husk hot melt adhesive composite powder to the powdered rice hulls property advanced heat drying treatment; Thereby evaporative removal moisture in the rice husk; Concurrent first portion thermal destruction; The low material of thermostability is removed, formed more inner vesicular structure, adsorptivity (or water absorbability) obviously increases.Therefore; After the acetone soln that step 2 is dissolved with coupling agent and initiator is poured into; The vesicular structure of powdered rice hulls can adsorb more coupling agents and initiator, and acetone then volatilizees in the oven drying at low temperature process, and coupling agent and initiator are retained in the vesicular structure of powdered rice hulls; And then in selective laser sintering process, make coupling agent and initiator and powdered rice hulls, hot melt adhesive powder generation chemical reaction, not only shutoff the vesicular structure of powdered rice hulls, reduced wood and moulded the water absorbability that meets material; More strengthen interfacial bond power, improved the mechanical property of institute's job; And use that selective laser sintering of the present invention uses that the relative warpage rate of rice husk hot melt adhesive composite powder institute job is 0.24%～0.40%, surperficial roughness as Ra less than 0.01mm.
The present invention sneaks into organic filler and photostabilizer after preparing the step 3 oven drying at low temperature of selective laser sintering with rice husk hot melt adhesive composite powder again, carries out mixed at high speed, has played and has mixed and the surperficial effect of polishing powdered rice hulls; Under the situation of not using viscosity-depression agent; Still can guarantee in " pushing away powder " (or be called " shop powder ") process powder mix evenly, adhesion assembles, the uniform in thickness of shop powder has reduced the roughness on relative warpage rate, internal stress and the surface of component; Under external impacts, be difficult for rupturing; Have safety in utilization, and profiled member receives to be difficult for oxidative degradation after the uviolizing, improved the mechanical property of its processing parts.
Selective laser sintering of the present invention has cheap, safe in utilization with rice husk hot melt adhesive composite powder, prepare easy advantage.
Embodiment
Technical scheme of the present invention is not limited to following cited embodiment, also comprises the arbitrary combination between each embodiment.
Embodiment one: this embodiment selective laser sintering with rice husk hot melt adhesive composite powder by the hot melt adhesive powder, process through rice husk powder, photostabilizer, coupling agent, initiator and the organic filler of drying treatment; Wherein the hot melt adhesive powder is 5～3: 1 with weight ratio through the rice husk powder of drying treatment; Coupling agent be the hot melt adhesive powder with through 1%～5% of the rice husk powder total mass of drying treatment; Initiator be the hot melt adhesive powder with through 0.1%～2% of the rice husk powder total mass of drying treatment; Organic filler be the hot melt adhesive powder with through 2%～20% of the rice husk powder total mass of drying treatment, photostabilizer be the hot melt adhesive powder with through 0.2%～6% of the rice husk powder total mass of drying treatment; Organic filler is polypropylene powder or polyethylene powders.
Rice husk is a kind of have certain toughness, porousness, the coarse polymer natural organic of low density and quality; Have the real density height and (be about 720kg/m
3) advantage, can significantly promote part machinery intensity.
The powdered rice hulls extexine is cellular, shape such as sand dune.See that from the transverse section appearance is corrugated.This structure of powdered rice hulls will increase contact surface greatly in making the wood plastic composite process.Powdered rice hulls inside is a kind of short texture, has a large amount of holes to exist.Inside mainly is made up of fiber, vascular and parenchyma, and the extexine of powdered rice hulls is lignifying, and inside and internal skin are non-lignifying.
Select for use this embodiment selective laser sintering to be merely 20%～26% of PVC/ powdered rice hulls matrix material with the cost of the prepared wood plastic composite of rice husk hot melt adhesive composite powder.
Photostabilizer is Ultraviolet Absorber UV-P, UV light absorber UV531, UV light absorber UV327, photostabilizer GW-540 or photostabilizer 744 in this embodiment.Carbonyl can serve as chromophoric group (aging initiator) has booster action to organic filler aging, causes composite material surface to fade, and makes the surface form the strong aged thin layer of one deck, and produces large-area embrittlement.The adding of photostabilizer can slow down aging, improves the use aesthetic property and the work-ing life of institute's job.
The adding of organic filler improves the biodurable and the weathering resistance of institute's job in this embodiment, but exceeding this embodiment institute restricted portion can increase fragility.
Embodiment two: the difference of this embodiment and embodiment one is: the hot melt adhesive powder is 4.5～3.5: 1 with weight ratio through the rice husk powder of drying treatment.Other is identical with embodiment one.
Embodiment three: this embodiment and embodiment one or two difference are: the hot melt adhesive powder is 4: 1 with weight ratio through the rice husk powder of drying treatment.Other is identical with embodiment one or two.
Embodiment four: this embodiment with embodiment one, two or three difference is: coupling agent is maleic anhydride or maleic anhydride inoculated polypropylene.Other is identical with embodiment one, two or three.
Embodiment five: this embodiment with the difference of one of embodiment one to four is: initiator is a Di Cumyl Peroxide 99.Other is identical with one of embodiment one to four.
The adding of coupling agent can also improve the interface compatibility of powdered rice hulls and organic filler; Coupling agent and Di Cumyl Peroxide 99 (DCP) are dissolved in acetone, can disperse reagent, and utilize the water absorbability of powdered rice hulls to increase contact area, reaction area.
Embodiment six: this embodiment with the difference of one of embodiment one to five is: the hot melt adhesive powder is PES hot melt adhesive powder or EVA hot melt adhesive powder.Other is identical with one of embodiment one to five.
Embodiment seven: the difference of one of this embodiment and embodiment one to six is: the hot melt adhesive powder, through the granularity of the rice husk powder of drying treatment and organic filler all less than 180 μ m.Other is identical with one of embodiment one to six.
Embodiment eight: this embodiment selective laser sintering prepares with the preparation method of rice husk hot melt adhesive composite powder according to the following steps: one, powdered rice hulls heat drying treatment; With powdered rice hulls under 140 ℃ of conditions dry 5 hours; And every separated 2h stirs once in the drying process, promptly obtains the rice husk powder through drying treatment; Two, will mix through the rice husk powder and the hot melt adhesive powder of drying treatment by hot melt adhesive powder and weight ratio through the rice husk powder 5～3: 1 of drying treatment; The acetone soln that will be dissolved with coupling agent and initiator is afterwards poured into; Continue to stir, obtain base-material; Three, base-material is dried in 45 ± 2 ℃ of environment; Then in hot melt adhesive powder and ratio through the rice husk powder total mass 2%～20% of drying treatment add organic filler, by hot melt adhesive powder and ratio adding photostabilizer through the rice husk powder total mass 0.2%～6% of drying treatment; And be to mix under 720～1440r/min condition at rotating speed, promptly obtain selective laser sintering with rice husk hot melt adhesive composite powder; Be the hot melt adhesive powder in coupling agent in the step 2 wherein and rice husk powder total mass 1%～5%, initiator through drying treatment is the hot melt adhesive powder and ratio through the rice husk powder total mass 0.1%～2% of drying treatment is dissolved in acetone with coupling agent and initiator; Organic filler is polypropylene powder or polyethylene powders in the step 3.
Though belonging to, powdered rice hulls is difficult for the fluidizing medium; But the powdered rice hulls outside surface is coated with slick, cornified silicon dioxide film; Formed a kind of nonpolar surface structure; So the silicon dioxide film of powdered rice hulls outside surface has played the effect of lubricant in selective laser sintering process, make the part of producing more closely knit, structure is tightr.
This embodiment has utilized the water absorbability of powdered rice hulls just, with having improved the performance index of selective laser sintering with rice husk hot melt adhesive composite powder.
Acetone in this embodiment step 2 can satisfy the needs of used coupling agent of dissolving and initiator, and reduces the time of drying of step 3 as much as possible.
Photostabilizer in this embodiment step 3 is Ultraviolet Absorber UV-P, UV light absorber UV531, UV light absorber UV327, photostabilizer GW-540 or photostabilizer 744.
Embodiment nine: the difference of this embodiment and embodiment eight is: the hot melt adhesive powder is 4.5～3.5: 1 with weight ratio through the rice husk powder of drying treatment in the step 2.Other step and parameter are identical with embodiment eight.
Embodiment ten: the difference of this embodiment and embodiment eight is: the hot melt adhesive powder is 4: 1 with weight ratio through the rice husk powder of drying treatment in the step 2.Other step and parameter are identical with embodiment eight.
Embodiment 11: this embodiment with embodiment eight, nine or ten difference is: coupling agent is maleic anhydride or maleic anhydride inoculated polypropylene in the step 2.Other step and parameter are identical with embodiment eight, nine or ten.
Embodiment 12: this embodiment with the difference of one of embodiment eight to 11 is: initiator is a Di Cumyl Peroxide 99 in the step 2.Other step and parameter are identical with one of embodiment eight to 11.
Embodiment 13: this embodiment with the difference of one of embodiment eight to 12 is: the hot melt adhesive powder is PES hot melt adhesive powder or EVA hot melt adhesive powder in the step 2.Other step and parameter are identical with one of embodiment eight to 12.
Embodiment 14: the difference of one of this embodiment and embodiment eight to 13 is: the hot melt adhesive powder, through the granularity of the rice husk powder of drying treatment and organic filler all less than 180 μ m.Other step and parameter are identical with one of embodiment eight to 13.
Embodiment 1
Selective laser sintering prepares with the preparation method of rice husk hot melt adhesive composite powder according to the following steps:
One, powdered rice hulls heat drying treatment with powdered rice hulls under 140 ℃ of conditions dry 5 hours, and whenever in the drying process is stirred once at a distance from 2h, promptly obtains the rice husk powder through drying treatment; Two, by the hot melt adhesive powder with will mix through the rice husk powder and the hot melt adhesive powder of drying treatment through 3: 1 the weight ratio of rice husk powder of drying treatment, the acetone soln that will be dissolved with coupling agent and initiator is afterwards poured into, continues to stir, and obtains base-material; Three, base-material is dried in 45 ℃ of environment; Then in hot melt adhesive powder and ratio through the rice husk powder total mass 4% of drying treatment add organic filler, by hot melt adhesive powder and ratio adding photostabilizer (Ultraviolet Absorber UV-P) through the rice husk powder total mass 0.3% of drying treatment; And be to mix under the 720r/min condition at rotating speed, promptly obtain selective laser sintering with rice husk hot melt adhesive composite powder; Be the hot melt adhesive powder in coupling agent in the step 2 wherein and rice husk powder total mass 2%, initiator through drying treatment is the hot melt adhesive powder and ratio through the rice husk powder total mass 1.8% of drying treatment is dissolved in acetone with coupling agent and initiator; Organic filler is a polypropylene powder in the step 3; Initiator is a Di Cumyl Peroxide 99 in the step 2; Coupling agent is a maleic anhydride in the step 2; The hot melt adhesive powder is a PES hot melt adhesive powder in the step 2; The hot melt adhesive powder, be 100～120 μ m through the rice husk powder of drying treatment and the granularity of organic filler.
Compare experiment:
Divide 3 groups to compare experiment, the 1st group with this embodiment selective laser sintering with rice husk hot melt adhesive composite powder as the selective laser sintering rapid forming raw materials technology; The 2nd group with wood powder and the direct powder mix of hot melt adhesive powder as the selective laser sintering rapid forming raw materials technology; The 3rd group prepares the raw material of the foaming material shaped technology of PVC/ powdered rice hulls with PVC/ powdered rice hulls matrix material as extrusion molding, and wherein powdered rice hulls is 40 parts, carries out modification (" PVC/ powdered rice hulls composite structure and performance study ") with MMA.Laser sintering rapid forming equipment adopts the HPRS-III rapidform machine of the Central China University of Science and Technology.
The condition that processing is the most suitable: adopt the subregion scan mode; Laser output power is 30～50W, and the rate travel of scan laser light beam is 1800mm/s～2000mm/s, and the characteristic radius of laser facula is 0.3mm; The laser beam sweep span is 0.15mm, and lift height is 0.1～0.2mm.
Contrast and experiment: the relative warpage rate of the 1st group of prepared product is that the relative warpage rate of 0.28%, the 2 group of prepared product is that the relative warpage rate of 0.89%, the 3 group of prepared product is 0.75%.Explain that the product that this embodiment adopts selective laser sintering to prepare with rice husk hot melt adhesive composite powder has better Forming Quality.
The powder mix gathering that evenly, do not stick together in the 1st group of " pushing away powder " process, thus the thickness of shop powder evenly, unified, reduce so guaranteed the equilibrium of internal stress, surfaceness; Under illumination condition, be difficult for taking place photodegradation, stability is strong, and has improved each item mechanical index of the product of preparing (component); Wherein tensile strength on average can reach 0.15MPa; Shock strength on average can reach 1.495 kilojoules/square metre, flexural strength on average can reach 0.37MPa, the 2nd group of product of preparing (component) tensile strength is 0.014MPa; Shock strength be 0.567 kilojoule/square metre, flexural strength is 0.475MPa.The mechanical property that the prepared component that go out of the Wood-plastic composite powder of selecting for use this embodiment to be used for selective laser sintering rapid forming are described obviously is superior to the 2nd group.The 3rd group of product of preparing (component) tensile strength is 18.7MPa, shock strength be 5.27 kilojoules/square metre, bending elastic modulus 1536MPa.
Can further improve each item mechanical index of the 1st group of product of preparing (component) behind the waxdip, tensile strength on average can reach 1.474MPa, shock strength on average can reach 3.739 kilojoules/square metre, bending strength on average can reach 3.86MPa.
The surface roughness Ra of the 1st group of product of preparing (component) is 0.006～0.008mm; The surface roughness Ra of the 2nd group of product of preparing (component) is 0.06～0.094mm, and the surface roughness Ra of the 3rd group of product of preparing (component) is 0.1～0.2mm.
Present embodiment selects for use the laser sintered cost with the prepared wood plastic composite of rice husk hot melt adhesive composite powder of the 1st group selection property to be merely 21% of the 3rd group of PVC/ powdered rice hulls matrix material.
Embodiment 2
Selective laser sintering prepares with the preparation method of rice husk hot melt adhesive composite powder according to the following steps:
One, powdered rice hulls heat drying treatment with powdered rice hulls under 140 ℃ of conditions dry 5 hours, and whenever in the drying process is stirred once at a distance from 2h, promptly obtains the rice husk powder through drying treatment; Two, by the hot melt adhesive powder with will mix through the rice husk powder and the hot melt adhesive powder of drying treatment through 3.5: 1 the weight ratio of rice husk powder of drying treatment, the acetone soln that will be dissolved with coupling agent and initiator is afterwards poured into, continues to stir, and obtains base-material; Three, base-material is dried in 45 ℃ of environment; Then in hot melt adhesive powder and ratio through the rice husk powder total mass 18% of drying treatment add organic filler, by hot melt adhesive powder and ratio adding photostabilizer through the rice husk powder total mass 5.5% of drying treatment; And be to mix under the 780r/min condition at rotating speed, promptly obtain selective laser sintering with rice husk hot melt adhesive composite powder; Be the hot melt adhesive powder in coupling agent in the step 2 wherein and rice husk powder total mass 3%, initiator through drying treatment is the hot melt adhesive powder and ratio through the rice husk powder total mass 1% of drying treatment is dissolved in acetone with coupling agent and initiator; Organic filler is a polyethylene powders in the step 3; Initiator is a Di Cumyl Peroxide 99 in the step 2; Coupling agent is a maleic anhydride inoculated polypropylene in the step 2; The hot melt adhesive powder is an EVA hot melt adhesive powder in the step 2; The hot melt adhesive powder, be 100～120 μ m through the rice husk powder of drying treatment and the granularity of organic filler.
Compare experiment:
Divide 3 groups to compare experiment, the 1st group with this embodiment selective laser sintering with rice husk hot melt adhesive composite powder as the selective laser sintering rapid forming raw materials technology; The 2nd group with wood powder and the direct powder mix of hot melt adhesive powder as the selective laser sintering rapid forming raw materials technology; The 3rd group prepares the raw material of the foaming material shaped technology of PVC/ powdered rice hulls with PVC/ powdered rice hulls matrix material as extrusion molding, and wherein powdered rice hulls is 40 parts, carries out modification (" PVC/ powdered rice hulls composite structure and performance study ") with MMA.Laser sintering rapid forming equipment adopts the HPRS-III rapidform machine of the Central China University of Science and Technology.
The condition that processing is the most suitable: adopt the subregion scan mode; Laser output power is 30～50W, and the rate travel of scan laser light beam is 1800mm/s～2000mm/s, and the characteristic radius of laser facula is 0.3mm; The laser beam sweep span is 0.15mm, and lift height is 0.1～0.2mm.
Contrast and experiment: the relative warpage rate of the 1st group of prepared product is that the relative warpage rate of 0.29%, the 2 group of prepared product is that the relative warpage rate of 0.89%, the 3 group of prepared product is 0.75%.Explain that the product that this embodiment adopts selective laser sintering to prepare with rice husk hot melt adhesive composite powder has better Forming Quality.
The powder mix gathering that evenly, do not stick together in the 1st group of " pushing away powder " process, thus the thickness of shop powder evenly, unified, reduce so guaranteed the equilibrium of internal stress, surfaceness; Under illumination condition, be difficult for taking place photodegradation, stability is strong, and has improved each item mechanical index of the product of preparing (component); Wherein tensile strength on average can reach 0.16MPa; Shock strength on average can reach 1.501 kilojoules/square metre, flexural strength on average can reach 0.36MPa, the 2nd group of product of preparing (component) tensile strength is 0.014MPa; Shock strength be 0.567 kilojoule/square metre, flexural strength is 0.475MPa.The mechanical property that the prepared component that go out of the Wood-plastic composite powder of selecting for use this embodiment to be used for selective laser sintering rapid forming are described obviously is superior to the 2nd group.The 3rd group of product of preparing (component) tensile strength is 18.7MPa, shock strength be 5.27 kilojoules/square metre, bending elastic modulus 1536MPa.
Can further improve each item mechanical index of the 1st group of product of preparing (component) behind the waxdip, tensile strength on average can reach 1.533MPa, shock strength on average can reach 3.846 kilojoules/square metre, bending strength on average can reach 4.27MPa.
The surface roughness Ra of the 1st group of product of preparing (component) is 0.006～0.008mm; The surface roughness Ra of the 2nd group of product of preparing (component) is 0.06～0.094mm, and the surface roughness Ra of the 3rd group of product of preparing (component) is 0.1～0.2mm.
Present embodiment selects for use the laser sintered cost with the prepared wood plastic composite of rice husk hot melt adhesive composite powder of the 1st group selection property to be merely 23% of the 3rd group of PVC/ powdered rice hulls matrix material.
Embodiment 3
Selective laser sintering prepares with the preparation method of rice husk hot melt adhesive composite powder according to the following steps:
One, powdered rice hulls heat drying treatment with powdered rice hulls under 140 ℃ of conditions dry 5 hours, and whenever in the drying process is stirred once at a distance from 2h, promptly obtains the rice husk powder through drying treatment; Two, by the hot melt adhesive powder with will mix through the rice husk powder and the hot melt adhesive powder of drying treatment through 4: 1 the weight ratio of rice husk powder of drying treatment, the acetone soln that will be dissolved with coupling agent and initiator is afterwards poured into, continues to stir, and obtains base-material; Three, base-material is dried in 45 ℃ of environment; Then in hot melt adhesive powder and ratio through the rice husk powder total mass 17% of drying treatment add organic filler, by hot melt adhesive powder and ratio adding photostabilizer through the rice husk powder total mass 3% of drying treatment; And be to mix under the 840r/min condition at rotating speed, promptly obtain selective laser sintering with rice husk hot melt adhesive composite powder; Be the hot melt adhesive powder in coupling agent in the step 2 wherein and rice husk powder total mass 2%, initiator through drying treatment is the hot melt adhesive powder and ratio through the rice husk powder total mass 1.8% of drying treatment is dissolved in acetone with coupling agent and initiator; Organic filler is a polypropylene powder in the step 3; Initiator is a Di Cumyl Peroxide 99 in the step 2; Coupling agent is a maleic anhydride inoculated polypropylene in the step 2; The hot melt adhesive powder is a PES hot melt adhesive powder in the step 2; The hot melt adhesive powder, be 100～120 μ m through the rice husk powder of drying treatment and the granularity of organic filler.
Compare experiment:
Divide 3 groups to compare experiment, the 1st group with this embodiment selective laser sintering with rice husk hot melt adhesive composite powder as the selective laser sintering rapid forming raw materials technology; The 2nd group with wood powder and the direct powder mix of hot melt adhesive powder as the selective laser sintering rapid forming raw materials technology; The 3rd group prepares the raw material of the foaming material shaped technology of PVC/ powdered rice hulls with PVC/ powdered rice hulls matrix material as extrusion molding, and wherein powdered rice hulls is 40 parts, carries out modification (" PVC/ powdered rice hulls composite structure and performance study ") with MMA.Laser sintering rapid forming equipment adopts the HPRS-III rapidform machine of the Central China University of Science and Technology.
The condition that processing is the most suitable: adopt the subregion scan mode; Laser output power is 30～50W, and the rate travel of scan laser light beam is 1800mm/s～2000mm/s, and the characteristic radius of laser facula is 0.3mm; The laser beam sweep span is 0.15mm, and lift height is 0.1～0.2mm.
Contrast and experiment: the relative warpage rate of the 1st group of prepared product is that the relative warpage rate of 0.37%, the 2 group of prepared product is that the relative warpage rate of 0.89%, the 3 group of prepared product is 0.75%.Explain that the product that this embodiment adopts selective laser sintering to prepare with rice husk hot melt adhesive composite powder has better Forming Quality.
The powder mix gathering that evenly, do not stick together in the 1st group of " pushing away powder " process, thus the thickness of shop powder evenly, unified, reduce so guaranteed the equilibrium of internal stress, surfaceness; Under illumination condition, be difficult for taking place photodegradation, stability is strong, and has improved each item mechanical index of the product of preparing (component); Wherein tensile strength on average can reach 0.153MPa; Shock strength on average can reach 1.489 kilojoules/square metre, flexural strength on average can reach 0.39MPa, the 2nd group of product of preparing (component) tensile strength is 0.014MPa; Shock strength be 0.567 kilojoule/square metre, flexural strength is 0.475MPa.The mechanical property that the prepared component that go out of the Wood-plastic composite powder of selecting for use this embodiment to be used for selective laser sintering rapid forming are described obviously is superior to the 2nd group.The 3rd group of product of preparing (component) tensile strength is 18.7MPa, shock strength be 5.27 kilojoules/square metre, bending elastic modulus 1536MPa.
Can further improve each item mechanical index of the 1st group of product of preparing (component) behind the waxdip, tensile strength on average can reach 1.624MPa, shock strength on average can reach 3.715 kilojoules/square metre, bending strength on average can reach 3.95MPa.
The surface roughness Ra of the 1st group of product of preparing (component) is 0.006～0.008mm; The surface roughness Ra of the 2nd group of product of preparing (component) is 0.06～0.094mm, and the surface roughness Ra of the 3rd group of product of preparing (component) is 0.1～0.2mm.
Present embodiment selects for use the laser sintered cost with the prepared wood plastic composite of rice husk hot melt adhesive composite powder of the 1st group selection property to be merely 23% of the 3rd group of PVC/ powdered rice hulls matrix material.
Embodiment 4
Selective laser sintering prepares with the preparation method of rice husk hot melt adhesive composite powder according to the following steps:
One, powdered rice hulls heat drying treatment with powdered rice hulls under 140 ℃ of conditions dry 5 hours, and whenever in the drying process is stirred once at a distance from 2h, promptly obtains the rice husk powder through drying treatment; Two, by the hot melt adhesive powder with will mix through the rice husk powder and the hot melt adhesive powder of drying treatment through 5: 1 the weight ratio of rice husk powder of drying treatment, the acetone soln that will be dissolved with coupling agent and initiator is afterwards poured into, continues to stir, and obtains base-material; Three, base-material is dried in 45 ℃ of environment; Then in hot melt adhesive powder and ratio through the rice husk powder total mass 20% of drying treatment add organic filler, by hot melt adhesive powder and ratio adding photostabilizer through the rice husk powder total mass 6% of drying treatment; And be to mix under the 1440r/min condition at rotating speed, promptly obtain selective laser sintering with rice husk hot melt adhesive composite powder; Be the hot melt adhesive powder in coupling agent in the step 2 wherein and rice husk powder total mass 5%, initiator through drying treatment is the hot melt adhesive powder and ratio through the rice husk powder total mass 2% of drying treatment is dissolved in acetone with coupling agent and initiator; Organic filler is a polypropylene powder in the step 3; Initiator is a Di Cumyl Peroxide 99 in the step 2; Coupling agent is a maleic anhydride inoculated polypropylene in the step 2; The hot melt adhesive powder is an EVA hot melt adhesive powder in the step 2; The hot melt adhesive powder, be 100～120 μ m through the rice husk powder of drying treatment and the granularity of organic filler.
Compare experiment:
Divide 3 groups to compare experiment, the 1st group with this embodiment selective laser sintering with rice husk hot melt adhesive composite powder as the selective laser sintering rapid forming raw materials technology; The 2nd group with wood powder and the direct powder mix of hot melt adhesive powder as the selective laser sintering rapid forming raw materials technology; The 3rd group prepares the raw material of the foaming material shaped technology of PVC/ powdered rice hulls with PVC/ powdered rice hulls matrix material as extrusion molding, and wherein powdered rice hulls is 40 parts, carries out modification (" PVC/ powdered rice hulls composite structure and performance study ") with MMA.Laser sintering rapid forming equipment adopts the HPRS-III rapidform machine of the Central China University of Science and Technology.
The condition that processing is the most suitable: adopt the subregion scan mode; Laser output power is 30～50W, and the rate travel of scan laser light beam is 1800mm/s～2000mm/s, and the characteristic radius of laser facula is 0.3mm; The laser beam sweep span is 0.15mm, and lift height is 0.1～0.2mm.
Contrast and experiment: the relative warpage rate of the 1st group of prepared product is that the relative warpage rate of 0.25%, the 2 group of prepared product is that the relative warpage rate of 0.89%, the 3 group of prepared product is 0.75%.Explain that the product that this embodiment adopts selective laser sintering to prepare with rice husk hot melt adhesive composite powder has better Forming Quality.
The powder mix gathering that evenly, do not stick together in the 1st group of " pushing away powder " process, thus the thickness of shop powder evenly, unified, reduce so guaranteed the equilibrium of internal stress, surfaceness; Under illumination condition, be difficult for taking place photodegradation, stability is strong, and has improved each item mechanical index of the product of preparing (component); Wherein tensile strength on average can reach 0.162MPa; Shock strength on average can reach 1.537 kilojoules/square metre, flexural strength on average can reach 0.384MPa, the 2nd group of product of preparing (component) tensile strength is 0.014MPa; Shock strength be 0.567 kilojoule/square metre, flexural strength is 0.475MPa.The mechanical property that the prepared component that go out of the Wood-plastic composite powder of selecting for use this embodiment to be used for selective laser sintering rapid forming are described obviously is superior to the 2nd group.The 3rd group of product of preparing (component) tensile strength is 18.7MPa, shock strength be 5.27 kilojoules/square metre, bending elastic modulus 1536MPa.
Can further improve each item mechanical index of the 1st group of product of preparing (component) behind the waxdip, tensile strength on average can reach 1.634MPa, shock strength on average can reach 3.802 kilojoules/square metre, bending strength on average can reach 3.98MPa.
The surface roughness Ra of the 1st group of product of preparing (component) is 0.005～0.007mm; The surface roughness Ra of the 2nd group of product of preparing (component) is 0.06～0.094mm, and the surface roughness Ra of the 3rd group of product of preparing (component) is 0.1～0.2mm.
Present embodiment selects for use the laser sintered cost with the prepared wood plastic composite of rice husk hot melt adhesive composite powder of the 1st group selection property to be merely 26% of the 3rd group of PVC/ powdered rice hulls matrix material.
Embodiment 5
Selective laser sintering prepares with the preparation method of rice husk hot melt adhesive composite powder according to the following steps:
One, powdered rice hulls heat drying treatment with powdered rice hulls under 140 ℃ of conditions dry 5 hours, and whenever in the drying process is stirred once at a distance from 2h, promptly obtains the rice husk powder through drying treatment; Two, by the hot melt adhesive powder with will mix through the rice husk powder and the hot melt adhesive powder of drying treatment through 4.5: 1 the weight ratio of rice husk powder of drying treatment, the acetone soln that will be dissolved with coupling agent and initiator is afterwards poured into, continues to stir, and obtains base-material; Three, base-material is dried in 45 ℃ of environment; Then in hot melt adhesive powder and ratio through the rice husk powder total mass 15% of drying treatment add organic filler, by hot melt adhesive powder and ratio adding photostabilizer through the rice husk powder total mass 2% of drying treatment; And be to mix under the 1200r/min condition at rotating speed, promptly obtain selective laser sintering with rice husk hot melt adhesive composite powder; Be the hot melt adhesive powder in coupling agent in the step 2 wherein and rice husk powder total mass 3.5%, initiator through drying treatment is the hot melt adhesive powder and ratio through the rice husk powder total mass 1.5% of drying treatment is dissolved in acetone with coupling agent and initiator; Organic filler is a polyethylene powders in the step 3; Initiator is a Di Cumyl Peroxide 99 in the step 2; Coupling agent is a maleic anhydride inoculated polypropylene in the step 2; The hot melt adhesive powder is a PES hot melt adhesive powder in the step 2; The hot melt adhesive powder, be 100～120 μ m through the rice husk powder of drying treatment and the granularity of organic filler.
Compare experiment:
Divide 3 groups to compare experiment, the 1st group with this embodiment selective laser sintering with rice husk hot melt adhesive composite powder as the selective laser sintering rapid forming raw materials technology; The 2nd group with wood powder and the direct powder mix of hot melt adhesive powder as the selective laser sintering rapid forming raw materials technology; The 3rd group prepares the raw material of the foaming material shaped technology of PVC/ powdered rice hulls with PVC/ powdered rice hulls matrix material as extrusion molding, and wherein powdered rice hulls is 40 parts, carries out modification (" PVC/ powdered rice hulls composite structure and performance study ") with MMA.Laser sintering rapid forming equipment adopts the HPRS-III rapidform machine of the Central China University of Science and Technology.
The condition that processing is the most suitable: adopt the subregion scan mode; Laser output power is 30～50W, and the rate travel of scan laser light beam is 1800mm/s～2000mm/s, and the characteristic radius of laser facula is 0.3mm; The laser beam sweep span is 0.15mm, and lift height is 0.1～0.2mm.
Contrast and experiment: the relative warpage rate of the 1st group of prepared product is that the relative warpage rate of 0.34%, the 2 group of prepared product is that the relative warpage rate of 0.89%, the 3 group of prepared product is 0.75%.Explain that the product that this embodiment adopts selective laser sintering to prepare with rice husk hot melt adhesive composite powder has better Forming Quality.
The powder mix gathering that evenly, do not stick together in the 1st group of " pushing away powder " process, thus the thickness of shop powder evenly, unified, reduce so guaranteed the equilibrium of internal stress, surfaceness; Under illumination condition, be difficult for taking place photodegradation, stability is strong, and has improved each item mechanical index of the product of preparing (component); Wherein tensile strength on average can reach 0.171MPa; Shock strength on average can reach 1.514 kilojoules/square metre, flexural strength on average can reach 0.381MPa, the 2nd group of product of preparing (component) tensile strength is 0.014MPa; Shock strength be 0.567 kilojoule/square metre, flexural strength is 0.475MPa.The mechanical property that the prepared component that go out of the Wood-plastic composite powder of selecting for use this embodiment to be used for selective laser sintering rapid forming are described obviously is superior to the 2nd group.The 3rd group of product of preparing (component) tensile strength is 18.7MPa, shock strength be 5.27 kilojoules/square metre, bending elastic modulus 1536MPa.
Can further improve each item mechanical index of the 1st group of product of preparing (component) behind the waxdip, tensile strength on average can reach 1.534MPa, shock strength on average can reach 3.906 kilojoules/square metre, bending strength on average can reach 3.94MPa.
The surface roughness Ra of the 1st group of product of preparing (component) is 0.006～0.007mm; The surface roughness Ra of the 2nd group of product of preparing (component) is 0.06～0.094mm, and the surface roughness Ra of the 3rd group of product of preparing (component) is 0.1～0.2mm.
Present embodiment selects for use the laser sintered cost with the prepared wood plastic composite of rice husk hot melt adhesive composite powder of the 1st group selection property to be merely 23% of the 3rd group of PVC/ powdered rice hulls matrix material.
Embodiment 6
Selective laser sintering prepares with the preparation method of rice husk hot melt adhesive composite powder according to the following steps:
One, powdered rice hulls heat drying treatment with powdered rice hulls under 140 ℃ of conditions dry 5 hours, and whenever in the drying process is stirred once at a distance from 2h, promptly obtains the rice husk powder through drying treatment; Two, by the hot melt adhesive powder with will mix through the rice husk powder and the hot melt adhesive powder of drying treatment through 4: 1 the weight ratio of rice husk powder of drying treatment, the acetone soln that will be dissolved with coupling agent and initiator is afterwards poured into, continues to stir, and obtains base-material; Three, base-material is dried in 45 ℃ of environment; Then in hot melt adhesive powder and ratio through the rice husk powder total mass 10% of drying treatment add organic filler, by hot melt adhesive powder and ratio adding photostabilizer through the rice husk powder total mass 5% of drying treatment; And be to mix under the 960r/min condition at rotating speed, promptly obtain selective laser sintering with rice husk hot melt adhesive composite powder; Be the hot melt adhesive powder in coupling agent in the step 2 wherein and rice husk powder total mass 2%, initiator through drying treatment is the hot melt adhesive powder and ratio through the rice husk powder total mass 0.8% of drying treatment is dissolved in acetone with coupling agent and initiator; Organic filler is a polyethylene powders in the step 3; Initiator is a Di Cumyl Peroxide 99 in the step 2; Coupling agent is a maleic anhydride in the step 2; The hot melt adhesive powder is a PES hot melt adhesive powder in the step 2; The hot melt adhesive powder, be 100～120 μ m through the rice husk powder of drying treatment and the granularity of organic filler.
Compare experiment:
Divide 3 groups to compare experiment, the 1st group with this embodiment selective laser sintering with rice husk hot melt adhesive composite powder as the selective laser sintering rapid forming raw materials technology; The 2nd group with wood powder and the direct powder mix of hot melt adhesive powder as the selective laser sintering rapid forming raw materials technology; The 3rd group prepares the raw material of the foaming material shaped technology of PVC/ powdered rice hulls with PVC/ powdered rice hulls matrix material as extrusion molding, and wherein powdered rice hulls is 40 parts, carries out modification (" PVC/ powdered rice hulls composite structure and performance study ") with MMA.Laser sintering rapid forming equipment adopts the HPRS-III rapidform machine of the Central China University of Science and Technology.
The condition that processing is the most suitable: adopt the subregion scan mode; Laser output power is 30～50W, and the rate travel of scan laser light beam is 1800mm/s～2000mm/s, and the characteristic radius of laser facula is 0.3mm; The laser beam sweep span is 0.15mm, and lift height is 0.1～0.2mm.
Contrast and experiment: the relative warpage rate of the 1st group of prepared product is that the relative warpage rate of 0.34%, the 2 group of prepared product is that the relative warpage rate of 0.89%, the 3 group of prepared product is 0.75%.Explain that the product that this embodiment adopts selective laser sintering to prepare with rice husk hot melt adhesive composite powder has better Forming Quality.
The powder mix gathering that evenly, do not stick together in the 1st group of " pushing away powder " process, thus the thickness of shop powder evenly, unified, reduce so guaranteed the equilibrium of internal stress, surfaceness; Under illumination condition, be difficult for taking place photodegradation, stability is strong, and has improved each item mechanical index of the product of preparing (component); Wherein tensile strength on average can reach 0.164MPa; Shock strength on average can reach 1.520 kilojoules/square metre, flexural strength on average can reach 0.387MPa, the 2nd group of product of preparing (component) tensile strength is 0.014MPa; Shock strength be 0.567 kilojoule/square metre, flexural strength is 0.475MPa.The mechanical property that the prepared component that go out of the Wood-plastic composite powder of selecting for use this embodiment to be used for selective laser sintering rapid forming are described obviously is superior to the 2nd group.The 3rd group of product of preparing (component) tensile strength is 18.7MPa, shock strength be 5.27 kilojoules/square metre, bending elastic modulus 1536MPa.
Can further improve each item mechanical index of the 1st group of product of preparing (component) behind the waxdip, tensile strength on average can reach 1.602MPa, shock strength on average can reach 3.842 kilojoules/square metre, bending strength on average can reach 3.865MPa.
The surface roughness Ra of the 1st group of product of preparing (component) is 0.006～0.008mm; The surface roughness Ra of the 2nd group of product of preparing (component) is 0.06～0.094mm, and the surface roughness Ra of the 3rd group of product of preparing (component) is 0.1～0.2mm.
Present embodiment selects for use the laser sintered cost with the prepared wood plastic composite of rice husk hot melt adhesive composite powder of the 1st group selection property to be merely 24% of the 3rd group of PVC/ powdered rice hulls matrix material.
Embodiment 7
Selective laser sintering prepares with the preparation method of rice husk hot melt adhesive composite powder according to the following steps:
One, powdered rice hulls heat drying treatment with powdered rice hulls under 140 ℃ of conditions dry 5 hours, and whenever in the drying process is stirred once at a distance from 2h, promptly obtains the rice husk powder through drying treatment; Two, by the hot melt adhesive powder with will mix through the rice husk powder and the hot melt adhesive powder of drying treatment through 3.5: 1 the weight ratio of rice husk powder of drying treatment, the acetone soln that will be dissolved with coupling agent and initiator is afterwards poured into, continues to stir, and obtains base-material; Three, base-material is dried in 45 ℃ of environment; Then in hot melt adhesive powder and ratio through the rice husk powder total mass 12% of drying treatment add organic filler, by hot melt adhesive powder and ratio adding photostabilizer through the rice husk powder total mass 3.5% of drying treatment; And be to mix under the 1200r/min condition at rotating speed, promptly obtain selective laser sintering with rice husk hot melt adhesive composite powder; Be the hot melt adhesive powder in coupling agent in the step 2 wherein and rice husk powder total mass 4%, initiator through drying treatment is the hot melt adhesive powder and ratio through the rice husk powder total mass 0.5% of drying treatment is dissolved in acetone with coupling agent and initiator; Organic filler is a polyethylene powders in the step 3; Initiator is a Di Cumyl Peroxide 99 in the step 2; Coupling agent is a maleic anhydride in the step 2; The hot melt adhesive powder is an EVA hot melt adhesive powder in the step 2; The hot melt adhesive powder, be 100～120 μ m through the rice husk powder of drying treatment and the granularity of organic filler.
Compare experiment:
Divide 3 groups to compare experiment, the 1st group with this embodiment selective laser sintering with rice husk hot melt adhesive composite powder as the selective laser sintering rapid forming raw materials technology; The 2nd group with wood powder and the direct powder mix of hot melt adhesive powder as the selective laser sintering rapid forming raw materials technology; The 3rd group prepares the raw material of the foaming material shaped technology of PVC/ powdered rice hulls with PVC/ powdered rice hulls matrix material as extrusion molding, and wherein powdered rice hulls is 40 parts, carries out modification (" PVC/ powdered rice hulls composite structure and performance study ") with MMA.Laser sintering rapid forming equipment adopts the HPRS-III rapidform machine of the Central China University of Science and Technology.
The condition that processing is the most suitable: adopt the subregion scan mode; Laser output power is 30～50W, and the rate travel of scan laser light beam is 1800mm/s～2000mm/s, and the characteristic radius of laser facula is 0.3mm; The laser beam sweep span is 0.15mm, and lift height is 0.1～0.2mm.
Contrast and experiment: the relative warpage rate of the 1st group of prepared product is that the relative warpage rate of 0.27%, the 2 group of prepared product is that the relative warpage rate of 0.89%, the 3 group of prepared product is 0.75%.Explain that the product that this embodiment adopts selective laser sintering to prepare with rice husk hot melt adhesive composite powder has better Forming Quality.
The powder mix gathering that evenly, do not stick together in the 1st group of " pushing away powder " process, thus the thickness of shop powder evenly, unified, reduce so guaranteed the equilibrium of internal stress, surfaceness; Under illumination condition, be difficult for taking place photodegradation, stability is strong, and has improved each item mechanical index of the product of preparing (component); Wherein tensile strength on average can reach 0.155MPa; Shock strength on average can reach 1.532 kilojoules/square metre, flexural strength on average can reach 0.384MPa, the 2nd group of product of preparing (component) tensile strength is 0.014MPa; Shock strength be 0.567 kilojoule/square metre, flexural strength is 0.475MPa.The mechanical property that the prepared component that go out of the Wood-plastic composite powder of selecting for use this embodiment to be used for selective laser sintering rapid forming are described obviously is superior to the 2nd group.The 3rd group of product of preparing (component) tensile strength is 18.7MPa, shock strength be 5.27 kilojoules/square metre, bending elastic modulus 1536MPa.
Can further improve each item mechanical index of the 1st group of product of preparing (component) behind the waxdip, tensile strength on average can reach 1.627MPa, shock strength on average can reach 3.831 kilojoules/square metre, bending strength on average can reach 3.87MPa.
The surface roughness Ra of the 1st group of product of preparing (component) is 0.006～0.007mm; The surface roughness Ra of the 2nd group of product of preparing (component) is 0.06～0.094mm, and the surface roughness Ra of the 3rd group of product of preparing (component) is 0.1～0.2mm.
Present embodiment selects for use the laser sintered cost with the prepared wood plastic composite of rice husk hot melt adhesive composite powder of the 1st group selection property to be merely 22% of the 3rd group of PVC/ powdered rice hulls matrix material.
Embodiment 8
Selective laser sintering prepares with the preparation method of rice husk hot melt adhesive composite powder according to the following steps:
One, powdered rice hulls heat drying treatment with powdered rice hulls under 140 ℃ of conditions dry 5 hours, and whenever in the drying process is stirred once at a distance from 2h, promptly obtains the rice husk powder through drying treatment; Two, by the hot melt adhesive powder with will mix through the rice husk powder and the hot melt adhesive powder of drying treatment through 3: 1 the weight ratio of rice husk powder of drying treatment, the acetone soln that will be dissolved with coupling agent and initiator is afterwards poured into, continues to stir, and obtains base-material; Three, base-material is dried in 45 ℃ of environment; Then in hot melt adhesive powder and ratio through the rice husk powder total mass 9% of drying treatment add organic filler, by hot melt adhesive powder and ratio adding photostabilizer through the rice husk powder total mass 1% of drying treatment; And be to mix under the 1440r/min condition at rotating speed, promptly obtain selective laser sintering with rice husk hot melt adhesive composite powder; Be the hot melt adhesive powder in coupling agent in the step 2 wherein and rice husk powder total mass 4%, initiator through drying treatment is the hot melt adhesive powder and ratio through the rice husk powder total mass 1.4% of drying treatment is dissolved in acetone with coupling agent and initiator; Organic filler is a polypropylene powder in the step 3; Initiator is a Di Cumyl Peroxide 99 in the step 2; Coupling agent is a maleic anhydride in the step 2; The hot melt adhesive powder is an EVA hot melt adhesive powder in the step 2; The hot melt adhesive powder, be 100～120 μ m through the rice husk powder of drying treatment and the granularity of organic filler.
Compare experiment:
Divide 3 groups to compare experiment, the 1st group with this embodiment selective laser sintering with rice husk hot melt adhesive composite powder as the selective laser sintering rapid forming raw materials technology; The 2nd group with wood powder and the direct powder mix of hot melt adhesive powder as the selective laser sintering rapid forming raw materials technology; The 3rd group prepares the raw material of the foaming material shaped technology of PVC/ powdered rice hulls with PVC/ powdered rice hulls matrix material as extrusion molding, and wherein powdered rice hulls is 40 parts, carries out modification (" PVC/ powdered rice hulls composite structure and performance study ") with MMA.Laser sintering rapid forming equipment adopts the HPRS-III rapidform machine of the Central China University of Science and Technology.
The condition that processing is the most suitable: adopt the subregion scan mode; Laser output power is 30～50W, and the rate travel of scan laser light beam is 1800mm/s～2000mm/s, and the characteristic radius of laser facula is 0.3mm; The laser beam sweep span is 0.15mm, and lift height is 0.1～0.2mm.
Contrast and experiment: the relative warpage rate of the 1st group of prepared product is that the relative warpage rate of 0.36%, the 2 group of prepared product is that the relative warpage rate of 0.89%, the 3 group of prepared product is 0.75%.Explain that the product that this embodiment adopts selective laser sintering to prepare with rice husk hot melt adhesive composite powder has better Forming Quality.
The powder mix gathering that evenly, do not stick together in the 1st group of " pushing away powder " process, thus the thickness of shop powder evenly, unified, reduce so guaranteed the equilibrium of internal stress, surfaceness; Under illumination condition, be difficult for taking place photodegradation, stability is strong, and has improved each item mechanical index of the product of preparing (component); Wherein tensile strength on average can reach 0.164MPa; Shock strength on average can reach 1.564 kilojoules/square metre, flexural strength on average can reach 0.384MPa, the 2nd group of product of preparing (component) tensile strength is 0.014MPa; Shock strength be 0.567 kilojoule/square metre, flexural strength is 0.475MPa.The mechanical property that the prepared component that go out of the Wood-plastic composite powder of selecting for use this embodiment to be used for selective laser sintering rapid forming are described obviously is superior to the 2nd group.The 3rd group of product of preparing (component) tensile strength is 18.7MPa, shock strength be 5.27 kilojoules/square metre, bending elastic modulus 1536MPa.
Can further improve each item mechanical index of the 1st group of product of preparing (component) behind the waxdip, tensile strength on average can reach 1.673MPa, shock strength on average can reach 3.845 kilojoules/square metre, bending strength on average can reach 3.91MPa.
The surface roughness Ra of the 1st group of product of preparing (component) is 0.005～0.007mm; The surface roughness Ra of the 2nd group of product of preparing (component) is 0.06～0.094mm, and the surface roughness Ra of the 3rd group of product of preparing (component) is 0.1～0.2mm.
Present embodiment selects for use the laser sintered cost with the prepared wood plastic composite of rice husk hot melt adhesive composite powder of the 1st group selection property to be merely 22% of the 3rd group of PVC/ powdered rice hulls matrix material.
Claims (8)
1. selective laser sintering is with rice husk hot melt adhesive composite powder, it is characterized in that selective laser sintering with rice husk hot melt adhesive composite powder by the hot melt adhesive powder, process through rice husk powder, photostabilizer, coupling agent, initiator and the organic filler of drying treatment; Wherein the hot melt adhesive powder is 5～3: 1 with weight ratio through the rice husk powder of drying treatment; Coupling agent be the hot melt adhesive powder with through 1%～5% of the rice husk powder total mass of drying treatment; Initiator be the hot melt adhesive powder with through 0.1%～2% of the rice husk powder total mass of drying treatment; Organic filler be the hot melt adhesive powder with through 2%～20% of the rice husk powder total mass of drying treatment, photostabilizer be the hot melt adhesive powder with through 0.2%～6% of the rice husk powder total mass of drying treatment; Organic filler is polypropylene powder or polyethylene powders.
2. selective laser sintering according to claim 1 is with rice husk hot melt adhesive composite powder, it is characterized in that hot melt adhesive powder and weight ratio through the rice husk powder of drying treatment are 4.5～3.5: 1.
3. selective laser sintering according to claim 1 is with rice husk hot melt adhesive composite powder, it is characterized in that hot melt adhesive powder and weight ratio through the rice husk powder of drying treatment are 4: 1.
According to claim 1,2 or 3 described selective laser sinterings with rice husk hot melt adhesive composite powder, it is characterized in that coupling agent is maleic anhydride or maleic anhydride inoculated polypropylene.
5. selective laser sintering according to claim 4 is characterized in that with rice husk hot melt adhesive composite powder initiator is a Di Cumyl Peroxide 99.
6. selective laser sintering according to claim 5 is characterized in that with rice husk hot melt adhesive composite powder the hot melt adhesive powder is PES hot melt adhesive powder or EVA hot melt adhesive powder.
7. selective laser sintering according to claim 6 is with rice husk hot melt adhesive composite powder, it is characterized in that the hot melt adhesive powder, through the granularity of the rice husk powder of drying treatment and organic filler all less than 180 μ m.
According to claim 1 selective laser sintering with the preparation method of rice husk hot melt adhesive composite powder; It is characterized in that selective laser sintering prepares with the preparation method of rice husk hot melt adhesive composite powder according to the following steps: one, powdered rice hulls heat drying treatment; With powdered rice hulls under 140 ℃ of conditions dry 5 hours; And every separated 2h stirs once in the drying process, promptly obtains the rice husk powder through drying treatment; Two, will mix through the rice husk powder and the hot melt adhesive powder of drying treatment by hot melt adhesive powder and weight ratio through the rice husk powder 5～3: 1 of drying treatment; The acetone soln that will be dissolved with coupling agent and initiator is afterwards poured into; Continue to stir, obtain base-material; Three, base-material is dried in 45 ± 2 ℃ of environment; Then in hot melt adhesive powder and ratio through the rice husk powder total mass 2%～20% of drying treatment add organic filler, by hot melt adhesive powder and ratio adding photostabilizer through the rice husk powder total mass 0.2%～6% of drying treatment; And be to mix under 720～1440r/min condition at rotating speed, promptly obtain selective laser sintering with rice husk hot melt adhesive composite powder; Be the hot melt adhesive powder in coupling agent in the step 2 wherein and rice husk powder total mass 1%～5%, initiator through drying treatment is the hot melt adhesive powder and ratio through the rice husk powder total mass 0.1%～2% of drying treatment is dissolved in acetone with coupling agent and initiator; Organic filler is polypropylene powder or polyethylene powders in the step 3.
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| CN106589941A (en) * | 2016-03-16 | 2017-04-26 | 东北林业大学 | Glass-fiber-reinforced walnut shell composite powder material for laser sintering 3D printing technology |
| CN106589941B (en) * | 2016-03-16 | 2018-12-25 | 东北林业大学 | Laser sintered 3D printing technique fiberglass reinforced walnut shell composite powder material |
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Application publication date: 20120815 |