CN103214870A - Preparation method of environment-friendly wood-plastic composite material - Google Patents
Preparation method of environment-friendly wood-plastic composite material Download PDFInfo
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- CN103214870A CN103214870A CN2013101563837A CN201310156383A CN103214870A CN 103214870 A CN103214870 A CN 103214870A CN 2013101563837 A CN2013101563837 A CN 2013101563837A CN 201310156383 A CN201310156383 A CN 201310156383A CN 103214870 A CN103214870 A CN 103214870A
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Abstract
The invention discloses a preparation method of an environment-friendly wood-plastic composite material. The preparation method is characterized by crushing the waste preservative wood treated with a preservative and grinding the crushed waste preservative wood into powdery wood fibers, immersing the powdery wood fibers into a sodium hypochlorite solution to be oscillated at 20-30 DEG C for 0.5-1 hour, then heating the solution to 40 DEG C, and carrying out extraction for 3-4 hours; and then, drying the wood fibers and then mixing the dried wood fibers with thermoplastic materials and maleic anhydride grafted polypropylene according to a certain weight ratio, and carrying out extrusion forming on the mixture to prepare a wood-plastic floor. The preparation method has the beneficial effects that the waste preservative wood is utilized to prepare the wood-plastic composite material, and the waste CCA (copper chrome arsenate) preservative wood is fully utilized to produce outdoor garden landscape and building materials, so that not only can the wood resources be protected but also pollution can be eliminated and the environment can be purified; therefore, the preparation method has important significance for developing the economies in various regions, saving plenty of wood and implementing the strategy of sustainable development; and the boards prepared by the method have better and stronger color stability, corrosion resistance and mechanical properties, and are better than most wood-plastic composite materials in the market.
Description
Technical field
The present invention relates to a kind of wood plastic composite, relate in particular to a kind of preparation method of environmental protection wood plastic composite.
Background technology
When timber uses out of doors, need the process rotproofing to improve rotten performance of corrosion resistant and pest-resistant harmful performance usually, can improve more than 5 times its work-ing life at least.The CCA(chromated copper arenate) be a kind of Water Soluble Compound sanitas, characteristics such as the easy japanning of timber, cost colourless, tasteless because of it, that handle are relatively low, at home and abroad preserving timber has obtained widespread use in handling.China every year through antiseptic about 100,000 m
3Agricultural material, construction timber, gardens are with in the material, and CCA handles timber and accounts for 90%, and other sanitass processing materials only account for about 10%.In addition, the CCA of China's import in recent years preserving timber amplification is also bigger, and is annual from import preserving timbers such as the U.S., Canada, Finland, New Zealand, wherein all is that CCA handles material more than 80 %.
The CCA preserving timber has certain working life, reaches the processing that all will go out of use working life.Because in main component chromium, arsenic and the copper of CCA sanitas, chromium and arsenic are hypertoxic heavy metal or metalloid, its recovery method has certain potential safety hazard.Present most of depleted CCA preserving timber all adopts the mode of the mode of burying or burning to handle, and causes the huge waste and the environmental pollution of soil, discarded anticorrosion wooden resource, also can cause potential harm to HUMAN HEALTH.
Therefore,, not only can make the influence of the anticorrosion wood minimizing of discarded CCA, and can turn waste into wealth, have higher environmental benefit and economic benefit HUMAN HEALTH and environment if the discarded anticorrosion wood of CCA is handled and recycling.
It is less to utilize the CCA waste preservative timber to carry out the method for recycling at present, for example publication number is that CN 101597469B application for a patent for invention discloses a kind of waste preservative timber synthetic synvaren and preparation method thereof that utilizes, this method comprises at first will carry out liquefaction processing through preserving timber and the phenol that sanitas is handled under catalyzer, inhibitor action, obtain preserving timber liquefaction thing; Then preserving timber is liquefied thing and formaldehyde carries out polyreaction in basic solution, obtain synvaren.Do not find as yet to utilize discarded CCA preserving timber to prepare the method for environmental protection wood plastic composite.The present invention utilizes waste preservative timber to prepare wood plastic composite; make full use of discarded CCA preserving timber and produce outdoor gardening view, material of construction; not only can protect timber resources; and can decontamination, environment purification; be development various places economy and save a large amount of timber, and significant to implementation of sustainable development.Sheet material by this method preparation has better stronger colour stability and anti-decadent nature and mechanical property, is better than commercially available wood plastic composite.
Summary of the invention
The objective of the invention is with xylon and thermoplastics in the discarded anticorrosion wood of CCA is main raw material, by operations such as metal, height in broken, grinding, the discarded anticorrosion wood of CCA of extraction mix, melt extrude, makes the environmental protection wood plastic composite.
Technical solution problem of the present invention adopts following technical scheme:
A kind of preparation method of environmental protection wood plastic composite, its characteristics are, comprise the steps:
(1) the broken and shape xylon of claying into power of the waste preservative timber that sanitas is handled in the filter bag of then xylon being packed into, is submerged to and vibrated under temperature 20-30 ℃ condition in the extracting solution 0.5-1 hour, is heated to 40 ℃ then and extracts 3-4 hour; Described extracting solution is an aqueous sodium hypochlorite solution, and chlorinity is 8%, and extracting liquid pH value is 7.1＜pH＜8;
(2) filter bag of step (1) is taken out after, with deionized water washing and filtering bag, treat seasoning after, take out xylon; Cross the 30-100 mesh sieve handle the xylon particle, drying treatment then, the average moisture content that makes xylon is less than 3%;
(3) putting into miniature high-speed blending dispersion machine by weight the maleic anhydride inoculated polypropylene of the high density polyethylene(HDPE) of xylon that will obtain in the 50-60% step (2), 35%-48%, 2%-5%, to carry out height mixed;
(4) pellet that mixes is put into micro-twin screw extruder and carry out blend, 165 ℃-175 ℃ of temperature, revolution 50-65 rpm, blend time 10-20min, extrude, granulation, utilize thermocompressor 170 ℃-180 ℃ of hot pressing temperatures, hot pressing time 5-6min, under the pressure 3-4Mpa condition, compression molding.
Wherein, the waste preservative timber of the processing of the sanitas described in the step (1) is meant the timber that adopts chromated copper arenate Water Soluble Compound sanitas (CCA) to handle.
Drying treatment in the step (2) is meant drying treatment under 105 ℃ of temperature condition of baking oven.
Compared with the prior art, beneficial effect of the present invention is embodied in:
The present invention proposes to utilize waste preservative timber to prepare wood plastic composite; make full use of discarded CCA preserving timber and produce outdoor gardening view, material of construction; not only can protect timber resources; and can decontamination, environment purification; be development various places economy and save a large amount of timber, and significant to implementation of sustainable development.
Because the mixture of copper, chromium and arsenic exists, in the wood cell wall that CCA handles, there is abundant solid deposits.And wood surface presents hydrophobicity, help to increase the interface compatibility between timber and the thermoplastics, therefore the sheet material of the inventive method preparation has better stronger colour stability and anti-decadent nature and mechanical property, be better than commercially available normal wood plastic composite materials, and chromium, arsenic, copper extraction process are simple, the percentage extraction height, and wherein the extraction yield of chromium is more than 94%, the extraction yield of arsenic is more than 95%, and the extraction yield of copper is more than 97%.
The present invention adopts clorox to extract chromium, arsenic, the copper of discarding in the anticorrosion wood, and the chlorine bleach liquor easily is decomposed to form hypochlorous acid, wherein, discharges hypochlorite ion ClO under alkaline environment
-, ClO
-Tervalent chromium ion (deleterious) can be oxidized to sexivalent chromium ion (nontoxic), along with OH
-Consumption, and H
+Existence, the pH value in the solution is dropped rapidly to below 4, continue under the tart environment with CCA in Cu, replacement(metathesis)reaction takes place in As.
The environmental protection wood plastic composite of the present invention's preparation can be widely used in industries such as outdoor flooring, garden landscape, outdoor furniture, has good market outlook.
Embodiment
Below by embodiment technical solution of the present invention is done further and to be explained.
The test of GB/T 24137-2009 prescriptive procedure is pressed in the wood plastic composite bending strength of each embodiment, anti-artificial weathering, and the test of GB/T 24508-2009 prescriptive procedure is pressed in anti-fungi corrosion.
In following examples; the discarded anticorrosion wood of CCA is taken from the discarded floor (specification 90mm is wide * 24mm is thick * 300mm is long) in park, Nanjing; utilize the x-ray fluorescence spectrometry method; according to the american wood protection A9-99 of association (AWPA) testing method, the original content that records chromium, arsenic, the copper of sawdust sample is 6.23 milligrams/gram, 5.19 milligrams/gram, 3.28 milligrams/gram.
More than explanation that employed discarded floor among the embodiment is carried out be not to be technology limiting to technical solution of the present invention, adopt the anticorrosion wood of other discarded CCA all to be applicable to technical solution of the present invention, do not influence technique effect of the present invention.
Embodiment 1
1 will discard the anticorrosion wooden fragmentation of CCA after, put into pulverizing mill and wear into xylon, with xylon pack into filter paper bag after, put into the flask that contains aqueous sodium hypochlorite solution, the aqueous sodium hypochlorite solution chlorinity is 8%, pH=7.1.Flask is put into gyrate shaker, is 200rpm/min at rotating speed, and temperature is to vibrate 0.5-1 hour under 25 ℃ of conditions, is heated to 40 ℃ of constant temperature then and extracts 3-4 hour.
2 with after the filter bag taking-up, with deionized water washing and filtering bag, removes the residual extract of chromium, arsenic and copper on filter bag and xylon surface, treats to take out xylon after the seasoning.Through sieve method handle 30 order particles, under 105 ℃ of temperature condition of baking oven, carry out 24 hours drying treatment, make the average moisture content of xylon be reduced to less than 3%; The content of chromium, arsenic, copper is respectively 0.32 milligram/gram, 0.26 milligram/gram, 0.09 milligram/gram in the xylon after testing, collects washing fluid and extracting solution simultaneously and carries out toxicological harmless and handle.
3 put into miniature high-speed blending dispersion machine with 60% xylon, 35% high density polyethylene(HDPE), 5% maleic anhydride grafted polyethylene carries out height and mixes.
4 put into micro-twin screw extruder with the pellet that mixes carries out blend, and 175 ℃ of temperature, revolution 50 rpm, blend time 10min extrude, granulation, utilize thermocompressor 180 ℃ of hot pressing temperatures, hot pressing time 5min is under the pressure 4Mpa condition, according to certain mould compression molding.
After tested, the wood plastic composite bending strength of present embodiment requires bending strength 〉=20MPa) for 65MPa(GB/T 24137-2009, bending strength retention rate 92%, colour fastness to light are 5 grades (GB/T 24137-2009 requires bending strength retention rate 〉=80%, colour fastness to light for 〉=3 grades) in the anti-artificial weathering test, and rate of weight loss in the corrosion test of anti-fungi the≤1%(GB/T 24508-2009 requires rate of weight loss in the corrosion test of anti-fungi the≤24%).
Embodiment 2
1, will discard the anticorrosion wooden fragmentation of CCA after, put into pulverizing mill and wear into xylon, with xylon pack into filter paper bag after, put into the flask that contains aqueous sodium hypochlorite solution, the aqueous sodium hypochlorite solution chlorinity is 8%, pH=8.Flask is put into gyrate shaker, is 200rpm/min at rotating speed, and temperature is to vibrate 0.5-1 hour under 30 ℃ of conditions, is heated to 40 ℃ of constant temperature then and extracts 3-4 hour.
2, filter bag is taken out after, after rinsing well with deionized water, treat to take out after the seasoning.Handle back 100 order particles through sieve method, under 105 ℃ of temperature condition of baking oven, carry out 24 hours drying treatment, make the average moisture content of xylon be reduced to less than 3%, the content of chromium, arsenic, copper is respectively 0.31 milligram/gram, 0.25 milligram/gram, 0.08 milligram/gram in the xylon after testing, collects washing fluid and extracting solution simultaneously and carries out toxicological harmless and handle.
3,50% xylon, 48% high density polyethylene(HDPE), 2% maleic anhydride grafted polyethylene being put into miniature high-speed blending dispersion machine carries out height and mixes.
4, the pellet that mixes is put into micro-twin screw extruder and carry out blend, 165 ℃ of temperature, revolution 65 rpm, blend time 20min extrude, granulation, utilize thermocompressor 170 ℃ of hot pressing temperatures, hot pressing time 6min is under the pressure 3Mpa condition, according to certain mould compression molding.
After tested, the wood plastic composite bending strength of present embodiment requires bending strength 〉=20MPa) for 59MPa(GB/T 24137-2009, bending strength retention rate 90%, colour fastness to light are 5 grades (GB/T 24137-2009 requires bending strength retention rate 〉=80%, colour fastness to light for 〉=3 grades) in the anti-artificial weathering test, and rate of weight loss in the corrosion test of anti-fungi the≤2%(GB/T 24508-2009 requires rate of weight loss in the corrosion test of anti-fungi the≤24%).
Claims (3)
1. the preparation method of an environmental protection wood plastic composite is characterized in that, comprises the steps:
(1) the broken and shape xylon of claying into power of the waste preservative timber that sanitas is handled in the filter bag of then xylon being packed into, is submerged to and vibrated under temperature 20-30 ℃ condition in the extracting solution 0.5-1 hour, is heated to 40 ℃ then and extracts 3-4 hour; Described extracting solution is an aqueous sodium hypochlorite solution, and chlorinity is 8%, and extracting liquid pH value is 7.1＜pH＜8;
(2) filter bag of step (1) is taken out after, with deionized water washing and filtering bag, treat seasoning after, take out xylon; Cross the 30-100 mesh sieve handle the xylon particle, drying treatment then, the average moisture content that makes xylon is less than 3%;
(3) putting into miniature high-speed blending dispersion machine by weight the maleic anhydride inoculated polypropylene of the high density polyethylene(HDPE) of xylon that will obtain in the 50-60% step (2), 35%-48%, 2%-5%, to carry out height mixed;
(4) pellet that mixes is put into micro-twin screw extruder and carry out blend, 165 ℃-175 ℃ of temperature, revolution 50-65 rpm, blend time 10-20min, extrude, granulation, utilize thermocompressor 170 ℃-180 ℃ of hot pressing temperatures, hot pressing time 5-6min, under the pressure 3-4Mpa condition, compression molding.
2. the preparation method of a kind of environmental protection wood plastic composite according to claim 1 is characterized in that, the waste preservative timber that the sanitas described in the step (1) is handled is meant the timber that adopts chromated copper arenate Water Soluble Compound sanitas (CCA) to handle.
3. the preparation method of a kind of environmental protection wood plastic composite according to claim 1 is characterized in that, the drying treatment in the described step (2) is meant drying treatment under 105 ℃ of temperature condition of baking oven.
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| CN201310156383.7A CN103214870B (en) | 2013-04-28 | 2013-04-28 | A kind of preparation method of environment-friendlywood-plastic wood-plastic composite material |
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| CN201310156383.7A CN103214870B (en) | 2013-04-28 | 2013-04-28 | A kind of preparation method of environment-friendlywood-plastic wood-plastic composite material |
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| CN103214870B CN103214870B (en) | 2015-08-26 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103589475A (en) * | 2013-11-13 | 2014-02-19 | 天津中材工程研究中心有限公司 | Production method of derived fuel of CCA (chromated copper arsenate) wood hazardous waste |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040225173A1 (en) * | 2003-05-09 | 2004-11-11 | Lin Lianzhen | Process for detoxification of CCA-treated wood |
| CN102140255A (en) * | 2011-04-14 | 2011-08-03 | 浙江工商大学 | Hot-press type wood plastic composite for toy and preparation method thereof |
| US8043399B1 (en) * | 2010-07-15 | 2011-10-25 | Board of Supervisors of Louisiana State University and Agricultural and Mechanical College LSU Inc | Process for rapid microwave-enhanced detoxification of CCA-treated wood |
-
2013
- 2013-04-28 CN CN201310156383.7A patent/CN103214870B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040225173A1 (en) * | 2003-05-09 | 2004-11-11 | Lin Lianzhen | Process for detoxification of CCA-treated wood |
| US8043399B1 (en) * | 2010-07-15 | 2011-10-25 | Board of Supervisors of Louisiana State University and Agricultural and Mechanical College LSU Inc | Process for rapid microwave-enhanced detoxification of CCA-treated wood |
| CN102140255A (en) * | 2011-04-14 | 2011-08-03 | 浙江工商大学 | Hot-press type wood plastic composite for toy and preparation method thereof |
Non-Patent Citations (4)
| Title |
|---|
| D.PASCAL KAMDEM ET AL.: ""Properties of wood plastic composites made of recycled HDPE and wood flour from CCA-treated wood removed from service"", 《COMPOSITES PART A：APPLIED SCIENCE AND MANUFACTURING》 * |
| E.D.GEZER ET AL.: ""Factors affecting sodium hypochlorite extraction of CCA from treated wood"", 《WASTE MANAGEMENT》 * |
| 伍波等: ""木塑复合材料界面化学改性研究进展"", 《化工新型材料》 * |
| 程青民等: ""界面改性增强塑木复合材料力学性能的研究进展"", 《材料导报》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103589475A (en) * | 2013-11-13 | 2014-02-19 | 天津中材工程研究中心有限公司 | Production method of derived fuel of CCA (chromated copper arsenate) wood hazardous waste |
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| CN103214870B (en) | 2015-08-26 |
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