CN1724230A - Method for lowing free formaldehyde releasing volume of high and middle density fibre board - Google Patents
Method for lowing free formaldehyde releasing volume of high and middle density fibre board Download PDFInfo
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- CN1724230A CN1724230A CN 200510041009 CN200510041009A CN1724230A CN 1724230 A CN1724230 A CN 1724230A CN 200510041009 CN200510041009 CN 200510041009 CN 200510041009 A CN200510041009 A CN 200510041009A CN 1724230 A CN1724230 A CN 1724230A
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- fibre board
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- free formaldehyde
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Abstract
A method for decreasing the amount of free formaldehyde released from high-and medium-density fiberboard includes such steps as sawing wood to become wood strips, loading them in spiral feeder, applying low-pressure steam and urea solution, hot grinding in grinder to obtain slurry, separating fibers, adding urea-formaldehyde resin, and drying to obtain glued fibers.
Description
Technical field
The invention belongs to wood-based plate and technical field of composite materials, relate to a kind of method of making the high medium density fibre board (MDF) of environment-friendly type.
Background technology
High medium density fibre board (MDF) is to be raw material with timber and adhesive, by fiber separation, applying glue, drying, mat formation, artificial board that operation such as hot pressing and post-production is made, be widely used in fields such as interior decoration, furniture manufacturing, building, car and boat manufacturing, electron trade.At present, the high medium density fibre board (MDF) that China produces nearly all adopts urea-formaldehyde resin adhesive, is certainly existing free formaldehyde and is discharging problem.
At present, the main path of China's reduction free formaldehyde in artificial plate is: start with from adhesive (1): as prepare urea-formaldehyde resin adhesive, the interpolation formaldehyde catching agent that hangs down mol ratio.(2) start with from production technology: as the control hot pressing parameters.(3) start with from post-processed: as edge sealing veneer facture, vacuum ammonia facture etc.Though said method has the good aldehyde effect of falling, and has also brought the production cost rising simultaneously, the sheet material physical and mechanical property is influenced, and production capacity descends, and acquiring auxiliary equipment increases problems such as investment.
Summary of the invention
The purpose of this invention is to provide a kind of low cost, technology simply, does not influence the method for free burst size of methanal in the high medium density fibre board (MDF) production process of reduction of product physical and mechanical property and the use.
Purpose of the present invention can realize by following manner:
A kind of method that reduces high medium density fibre board (MDF) free formaldehyde release comprises:
(1) wood raw material is processed into the wood chip unit of certain specification size, send into feeding screw, inner 0.2～0.3Mpa low-pressure steam that feeds applies urea liquid (concentration 10～30% simultaneously, dosage is 0～30% of a glue weight, free formaldehyde content, panel density and structure on glue are decided), in defibrator, adopt 120～130 ℃ of temperature defibrinations, defibre, apply urea-formaldehyde resin adhesive, resin added is 10～12%, and drying gets the applying glue wood-fibred;
(2) wood raw material is processed into the wood chip unit of certain specification size, send into feeding screw, inner 0.6～1.0MPa steam that feeds adopts 160～180 ℃ of temperature defibrinations in defibrator, defibre, apply urea-formaldehyde resin adhesive, resin added is 10～12%, applies urea liquid (concentration 10～30% again, dosage is 0～30% of a glue weight, free formaldehyde content, panel density and structure on glue are decided), drying gets the applying glue wood-fibred.
By processing to wood chip and/or fiber, high medium density fibre board (MDF) free formaldehyde release rate of descent can reach 30～60%, the high medium density fibre board (MDF) that free formaldehyde release is exceeded standard reaches the requirement of E2 level, makes the high medium density fibre board (MDF) of E2 level reach the requirement of E1 even E0 level.
Advantage of the present invention:
(1) with low cost.According to measuring and calculating, adopt above-mentioned processing method, the high medium density fibre board (MDF) that original free formaldehyde release is exceeded standard reaches national E2 level or the requirement of E1 grade standard, and cost only increases by 10～50 yuan/m
3, make the high medium density fibre board (MDF) of E2 level reach the requirement of national E1 grade standard, cost only increases by 5～10 yuan/m
3(free formaldehyde content on glue is decided)
(2) technology is simple.Urea is soluble in water, and this method only need acquire easy urea liquid on production line and spraying system can be realized (as accompanying drawing 1).
(3) do not influence production technology and product physical and mechanical property.This processing method does not influence the performance of glue, thereby existing production technology is not exerted an influence, and the physical and mechanical property of product is not had a negative impact yet.
Description of drawings
Fig. 1 is urea liquid modulating system figure of the present invention.
The specific embodiment
Embodiment 1:
Wood raw material is processed into the wood chip unit, send into the horizontal spiral feeder, the inner 0.3MPa low-pressure steam that feeds, apply 20% urea liquid (concentration 30%) of glue weight simultaneously, in defibrator, adopt 130 ℃ of temperature defibrinations, defibre, execute the E2 grade urea-formaldehyde resin adhesive, resin added is 12%, and drying gets fiber sizing; Fiber sizing is entered the siccative storehouse, and medium density fibre board (MDF) (thickness 10mm, density 750g/cm are made in the moulding of mating formation, hot pressing, cutting edge, cooling and sanding
3).Its physical and mechanical property measurement result sees Table 1, meets the requirement of China medium density fibre board (MDF) standard GB11768-1999 standard.
Table 1 is pressed the physical and mechanical property of the medium density fibre board (MDF) of embodiment 1 and is measured
| The mensuration project | Sheet material is untreated | Handle sheet material |
| Free formaldehyde release (mg/100g) | 20.68 | 8.32 |
| MOR MOR (MPa) | 24.56 | 25.47 |
| Elastic modelling quantity MOE (MPa) | 3214.61 | 3213.4 |
| Internal bond strength IB (MPa) | 0.513 | 0.525 |
| Thickness swelling rate TS (%) | 8.30 | 8.14 |
Embodiment 2:
Wood raw material is processed into the wood chip unit, send into the horizontal spiral feeder, the inner 0.6Mpa low-pressure steam that feeds, adopt 160 ℃ of temperature defibrinations in defibrator, defibre is executed the E2 grade urea-formaldehyde resin adhesive, resin added is 12%, apply 5% urea liquid (concentration 30%) of glue weight again, drying, fiber sizing; Fiber sizing is entered the siccative storehouse, and medium density fibre board (MDF) (thickness 10mm, density 750g/cm are made in the moulding of mating formation, hot pressing, cutting edge, cooling and sanding
3).Its physical and mechanical property measurement result sees Table 2, meets the requirement of China medium density fibre board (MDF) standard GB11768-1999 standard.
Table 2 is pressed the physical and mechanical property of the medium density fibre board (MDF) of embodiment 2 and is measured
| The mensuration project | Sheet material is untreated | Handle sheet material |
| Free formaldehyde release (mg/100g) | 10.38 | 6.30 |
| MOR MOR (MPa) | 29.23 | 28.70 |
| Elastic modelling quantity MOE (MPa) | 2648.92 | 2630.21 |
| Internal bond strength IB (MPa) | 0.550 | 0.543 |
| Thickness swelling rate TS (%) | 7.19 | 7.92 |
Claims (2)
1, a kind of method that reduces high medium density fibre board (MDF) free formaldehyde release is characterized in that:
(1) wood raw material is processed into the wood chip unit of certain specification size, send into feeding screw, inner 0.2～0.3Mpa low-pressure steam that feeds, apply urea liquid simultaneously, in defibrator, adopt 120～130 ℃ of temperature defibrinations, defibre, apply urea-formaldehyde resin adhesive, resin added is 10～12%, and drying gets the applying glue wood-fibred; Or
(2) wood raw material is processed into the wood chip unit of certain specification size, send into feeding screw, inner 0.6～1.0MPa steam that feeds, adopt 160～180 ℃ of temperature defibrinations in defibrator, defibre applies urea-formaldehyde resin adhesive, resin added is 10～12%, apply urea liquid again, drying gets the applying glue wood-fibred.
2, the method for the high medium density fibre board (MDF) free formaldehyde release of reduction according to claim 1 is characterized in that: urea concentration is 10～30%, and dosage is 0～30% of a glue weight.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200510041009 CN1724230A (en) | 2005-07-13 | 2005-07-13 | Method for lowing free formaldehyde releasing volume of high and middle density fibre board |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200510041009 CN1724230A (en) | 2005-07-13 | 2005-07-13 | Method for lowing free formaldehyde releasing volume of high and middle density fibre board |
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| Publication Number | Publication Date |
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| CN1724230A true CN1724230A (en) | 2006-01-25 |
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| CN 200510041009 Pending CN1724230A (en) | 2005-07-13 | 2005-07-13 | Method for lowing free formaldehyde releasing volume of high and middle density fibre board |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101879729A (en) * | 2010-07-01 | 2010-11-10 | 辽宁精化科技有限公司 | Process for modifying synthetic resin impregnated wood |
| CN102041890A (en) * | 2010-11-12 | 2011-05-04 | 湖南康派木业有限公司 | Method for manufacturing composite floor with low formaldehyde emission through heat treatment |
| CN103906607A (en) * | 2011-10-05 | 2014-07-02 | 马来西亚棕榈油总署 | Method for producing fibreboards utilizing palm biomass |
| CN104697942A (en) * | 2013-12-05 | 2015-06-10 | 张双保 | Comparison of determination methods for formaldehyde content of wood-based plates |
-
2005
- 2005-07-13 CN CN 200510041009 patent/CN1724230A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101879729A (en) * | 2010-07-01 | 2010-11-10 | 辽宁精化科技有限公司 | Process for modifying synthetic resin impregnated wood |
| CN102041890A (en) * | 2010-11-12 | 2011-05-04 | 湖南康派木业有限公司 | Method for manufacturing composite floor with low formaldehyde emission through heat treatment |
| CN103906607A (en) * | 2011-10-05 | 2014-07-02 | 马来西亚棕榈油总署 | Method for producing fibreboards utilizing palm biomass |
| CN103906607B (en) * | 2011-10-05 | 2016-06-08 | 马来西亚棕榈油总署 | A kind of method of utilizing palm living beings producd fibers plate |
| CN104697942A (en) * | 2013-12-05 | 2015-06-10 | 张双保 | Comparison of determination methods for formaldehyde content of wood-based plates |
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