CN101157241A - A method for preparing straw particle board - Google Patents
A method for preparing straw particle board Download PDFInfo
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- CN101157241A CN101157241A CNA2007101446151A CN200710144615A CN101157241A CN 101157241 A CN101157241 A CN 101157241A CN A2007101446151 A CNA2007101446151 A CN A2007101446151A CN 200710144615 A CN200710144615 A CN 200710144615A CN 101157241 A CN101157241 A CN 101157241A
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- straw
- particle board
- crushed aggregates
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- alkali lye
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Abstract
The invention discloses a straw particle board manufacture method, which relates to a particle board manufacture method. The invention solves the problem that the straw surface includes a plurality of waxy layers and SiO2 substance, common urea formaldehyde resin glue and phenolic resin are hard to wet the straw surface to cause a plurality of gluing difficulty. The invention has the method that: the straw is cut into pieces and performed ash removal at first, and straw crushed aggregates which are performed with the pretreatment through the blending ratio of the 1:4 to 5.0 according to the mass ratio of the straw and alkali liquor is soaked in the alkali liquor of 1.4 to 1.6 wt percent (mass) for 10 to 15 hours, and the straw particle board can be manufactured after drying, glue applying, paving, pre-pressing, hot pressing, and cooling. The equipment performance request of the straw particle board manufacture through the invention is low, the method is simple, and the operation parameter is easy to control. The method of the invention for performing chemical treatment to the straw raw material surface improves the wetting property of the raw material, greatly enhances the inner combination intensity, enlarges the application scope of the straw, releases the lack of the timber resources, and the invention has great economic and social efficiency in the situation that the conflict between supply and demand becomes more prominent.
Description
Technical field
The present invention relates to a kind of particle board manufacture method.
Background technology
China is poor woods big country, and the timber imbalance between supply and demand is very outstanding, and China is again large agricultural country, and annual crops straw output reaches 600,000,000 tons, and the straw of failing in a large number to utilize is all burned, and causes the very big pollution to environment.Contain a large amount of fibers in grass class, bast fiber etc. in the crops straw, can be used as wood substitutes and be used to produce various wood-based panel products, so the industrialized developing utilization of crops straw has great economy and social effect.Compare with the medium density fiber plate producing process with traditional wooden flake board, the straw wood-based plate exists on production technology because silica and wax coat content in the straw are higher, common urea formaldehyde resin glue and phenolic resins are difficult to the surface of wetting straw, cause its gummed difficulty big problem, and the overall performance that makes sheet material is difficult to the requirement that is up to state standards.
Summary of the invention
The objective of the invention is in order to solve when making straw particle board, because the architectural feature of straw cell and chemical constituent and timber are basic identical, a large amount of wax coats and SiO are contained in its surface
2Material, common urea formaldehyde resin glue and phenolic resins are difficult to the surface of wetting straw, cause its gummed difficulty big problem, and the overall performance that makes sheet material is difficult to the requirement that is up to state standards; And provide a kind of method of making straw particle board.The present invention makes the method for straw particle board and carries out according to the following steps: one, the preliminary treatment of straw: take from the straw that right gas is done, the crushed aggregates of straw that 0.3～3cm is grown in processing through the screening machine screening, is removed the dust in the crushed aggregates of straw more then; Two, handle with alkali lye: by crushed aggregates of straw and alkali lye mass ratio is that will to be immersed in mass percent concentration through pretreated crushed aggregates of straw be 10～15h in 1.4～1.6% the alkali lye for 1: 4～5.0 proportioning; Three, oven dry: under 80～120 ℃ of conditions, the crushed aggregates of straw after step 2 handled dry to moisture content be 2～4%; Four, applying glue: the crushed aggregates of straw surface after oven dry applies the isocyanate glue that accounts for crushed aggregates of straw weight 2.8～3.2% earlier, and applying in glue mixer and accounting for the crushed aggregates of straw weight ratio is 7.8～8.2% modified urea-formaldehyde glues, evenly stirs; Five, mat formation: the straw of glue mixing is evenly mated formation into slab; Six, precompressed: under room temperature and 1～1.5MPa condition, with the loose slab precompressed 20～30s that paves; Seven, hot pressing: carry out hot pressing under 135～195 ℃, 2.5～3.5MPa condition, hot pressing time is 18～22s/mm, then cooling at room temperature.
The present invention uses alkali lye that chemical treatment is carried out on the straw surface, strengthens the wettability and the bonding strength on its straw raw material surface.The present invention adopts isocyanate glue and twice pair of crushed aggregates of straw applying glue of urea-formaldehyde resin adhesive to make straw particle board, the one, reduced the high problem of independent use isocyanate glue applying glue expense, the 2nd, solve independent use urea-formaldehyde resin adhesive applying glue and made straw particle board intensity problem not up to standard.
That the equipment performance that the present invention makes straw particle board requires is low, method simple, operating parameter is easy to control.Of the present invention chemically treated method is carried out on the straw raw material surface, the wetability of raw material is improved, internal bond strength is greatly improved, improved the efficient utilization of straw, enlarged the range of application of straw, alleviated the timber resources shortage, the situation that disparities between supply and demand become increasingly conspicuous has great economic and social benefit.
The specific embodiment
The specific embodiment one: the method for making straw particle board in the present embodiment is carried out according to the following steps: one, the preliminary treatment of straw: take from the straw that right gas is done, the crushed aggregates of straw that 0.3～3cm is grown in processing, through the screening machine screening, remove the dust in the crushed aggregates of straw then again; Two, handle with alkali lye: by crushed aggregates of straw and alkali lye mass ratio is that will to be immersed in mass percent concentration through pretreated crushed aggregates of straw be 10～15h in 1.4～1.6% the alkali lye for 1: 4～5.0 proportioning; Three, oven dry: under 80～120 ℃ of conditions, the crushed aggregates of straw after step 2 handled dry to moisture content be 2～4%; Four, applying glue: the crushed aggregates of straw surface after oven dry applies the isocyanate glue that accounts for crushed aggregates of straw weight 2.8～3.2% earlier, and applying in glue mixer and accounting for the crushed aggregates of straw weight ratio is 7.8～8.2% modified urea-formaldehyde glues, evenly stirs; Five, mat formation: the straw of glue mixing is evenly mated formation into slab; Six, precompressed: under room temperature and 1～1.5MPa condition, with the loose slab precompressed 20～30s that paves; Seven, hot pressing: carry out hot pressing under 135～195 ℃, 2.5～3.5MPa condition, hot pressing time is 18～22s/mm, then cooling at room temperature.
The specific embodiment two: what present embodiment and the specific embodiment one were different is that 0.5～2cm crushed aggregates of straw is grown in the straw processing of in step 1 nature gas being done.Other reactions steps is identical with the specific embodiment one.
The specific embodiment three: what present embodiment and the specific embodiment one were different is that the 1cm crushed aggregates of straw is grown in the straw processing of in step 1 nature gas being done.Other reactions steps is identical with the specific embodiment one.
The specific embodiment four: present embodiment and the specific embodiment one are different is that the mass percent concentration of alkali lye in step 2 is 1.45～1.55%.Other reactions steps is identical with the specific embodiment one.
The specific embodiment five: present embodiment and the specific embodiment one are different is that the mass percent concentration of alkali lye in step 2 is 1.5%.Other reactions steps is identical with the specific embodiment one.
The specific embodiment six: present embodiment and the specific embodiment one are different is that crushed aggregates of straw and alkali lye mass ratio are 1: 4.2～4.8 in step 2.Other reactions steps is identical with the specific embodiment one.
The specific embodiment seven: present embodiment and the specific embodiment one are different is that crushed aggregates of straw and alkali lye mass ratio are 1: 4.5 in step 2.Other reactions steps is identical with the specific embodiment one.
The specific embodiment eight: present embodiment and the specific embodiment one are different is that the method that applies isocyanate glue in step 4 is the pneumatic spraying method.Other reactions steps is identical with the specific embodiment one.
The specific embodiment nine: what present embodiment and the specific embodiment one were different is that the consumption of isocyanate glue accounts for crushed aggregates of straw weight 3% in step 4.Other reactions steps is identical with the specific embodiment one.
The specific embodiment ten: what present embodiment and the specific embodiment one were different is that the consumption of modified urea-formaldehyde glue accounts for crushed aggregates of straw weight 8% in step 4.Other reactions steps is identical with the specific embodiment one.
The specific embodiment 11: that present embodiment and the specific embodiment one are different is preload pressure 1.2～1.5MPa in step 6.Other reactions steps is identical with the specific embodiment one.
The specific embodiment 12: that present embodiment and the specific embodiment one are different is preload pressure 1.5MPa in step 6.Other reactions steps is identical with the specific embodiment one.
The specific embodiment 13: present embodiment and the specific embodiment one are different is to carry out hot pressing in step 7 under 150～190 ℃, 2.8～3.2MPa condition, and hot pressing time is 19～21s/mm.Other reactions steps is identical with the specific embodiment one.
The specific embodiment 14: present embodiment and the specific embodiment one are different is to carry out hot pressing in step 7 under 170 ℃, 3.0MPa condition, and hot pressing time is 20s/mm.Other reactions steps is identical with the specific embodiment one.
The specific embodiment 15: present embodiment is made the method for straw particle board and is carried out according to the following steps: one, the preliminary treatment of straw: take from the straw that right gas is done the September, 0.3～3cm crushed aggregates of straw is grown in processing, through the screening machine screening, remove the dust in the crushed aggregates of straw then again; Two, handle with alkali lye: by crushed aggregates of straw and NaOH solution quality ratio is that will to be immersed in mass percent concentration through pretreated crushed aggregates of straw be 10～15h in 1.5% the NaOH solution for 1: 4.5 proportioning; Three, oven dry: under 100 ℃ of conditions, the crushed aggregates of straw after step 2 handled dry to moisture content be 2～4%; Four, applying glue: the crushed aggregates of straw surface after oven dry applies the isocyanate glue that accounts for crushed aggregates of straw weight 3% earlier, and applying weight ratio again in glue mixer is 8% modified urea-formaldehyde glue, evenly stirs; Five, mat formation: the straw of glue mixing is evenly mated formation into slab; Six, precompressed: under room temperature and 1.5MPa condition, with the slab precompressed 20～30s that paves; Seven, hot pressing: carry out hot pressing under 170 ℃ and 3.0MPa condition, hot pressing time is 20s/mm, then cooling at room temperature.
The method of employing present embodiment is made the straw particle board of crossing without the NaOH solution-treated under the straw particle board that the NaOH solution-treated is crossed and the same terms, (GB/T4897.3-2003) test its internal bond strength, density and moisture content with reference to national standard " furniture and the interior decoration used under drying regime require with plate ", the result is shown in table 1, table 2, table 3.
Table 1
| Without the NaOH solution-treated | Through the NaOH solution-treated | |||
| Maximum load Pmax/kN | Internal bond strength IB/MPa | Maximum load Pmax/kN | Internal bond strength IB/MPa | |
| Test 1 test 2 tests 3 tests 4 tests 5 tests 6 are average | 0.5977 1.0535 0.4617 0.9617 0.4290 1.0348 0.7564 | 0.232 0.406 0.179 0.371 0.166 0.394 0.2913 | 1.0333 1.4366 0.7878 1.394 0.8892 1.0651 1.1010 | 0.4245 0.5905 0.3232 0.5619 0.3691 0.4412 0.451733 |
Table 2
| Density | Test 1 | Test 2 | Test 3 | Test 4 | Test 5 | Test 6 | On average |
| Without the NaOH solution-treated through the NaOH solution-treated | 0.8525698 0.8777395 | 0.8562948 0.8261792 | 0.8752636 0.9425242 | 0.7598627 0.8967699 | 0.8560028 0.8724607 | 0.8481386 0.9306313 | 0.841355 0.891051 |
Table 3
| Moisture content (W/%) | Test 1 | Test 2 | Test 3 | Test 4 | Test 5 | Test 6 | On average |
| Without the NaOH solution-treated through the NaOH solution-treated | 5.572 7.632 | 5.552 6.943 | 5.354 8.103 | 4.671 7.9 | 4.82 8.207 | 4.783 8.347 | 5.5388 7.85533 |
By table 1-3 as seen, the straw particle board that the NaOH solution-treated is crossed is compared with the straw particle board of crossing without the NaOH solution-treated, density and moisture content change little, but internal bond strength has improved about 2 times, reached the national standard requirement, illustrated that alkali lye is handled fine and close wax coat and the SiO that has destroyed the crushed aggregates of straw surface to a certain extent
2Deng material, improved straw wettability of the surface energy, help the gummed of crushed aggregates of straw.
Claims (10)
1. method of making straw particle board, it is characterized in that the method for making straw particle board carries out according to the following steps: one, the preliminary treatment of straw: take from the straw that right gas is done, the crushed aggregates of straw that 0.3～3cm is grown in processing through the screening machine screening, is removed the dust in the crushed aggregates of straw more then; Two, handle with alkali lye: by crushed aggregates of straw and alkali lye mass ratio is that will to be immersed in mass percent concentration through pretreated crushed aggregates of straw be 10～15h in 1.4～1.6% the alkali lye for 1: 4～5.0 proportioning; Three, oven dry: under 80～120 ℃ of conditions, the crushed aggregates of straw after step 2 handled dry to moisture content be 2～4%; Four, applying glue: the crushed aggregates of straw surface after oven dry applies the isocyanate glue that accounts for crushed aggregates of straw weight 2.8～3.2% earlier, and applying in glue mixer and accounting for the crushed aggregates of straw weight ratio is 7.8～8.2% modified urea-formaldehyde glues, evenly stirs; Five, mat formation: the straw of glue mixing is evenly mated formation into slab; Six, precompressed: under room temperature and 1～1.5MPa condition, with the loose slab precompressed 20～30s that paves; Seven, hot pressing: carry out hot pressing under 135～195 ℃, 2.5～3.5MPa condition, hot pressing time is 18～22s/mm, then cooling at room temperature.
2. a kind of method of making straw particle board according to claim 1, the mass percent concentration that it is characterized in that alkali lye in step 2 is 1.45～1.55%.
3. a kind of method of making straw particle board according to claim 1, the mass percent concentration that it is characterized in that alkali lye in step 2 is 1.5%.
4. a kind of method of making straw particle board according to claim 1 is characterized in that the mass ratio of crushed aggregates of straw and alkali lye is 1: 4.2～4.8 in step 2.
5. a kind of method of making straw particle board according to claim 1 is characterized in that the mass ratio of crushed aggregates of straw and alkali lye is 1: 4.5 in step 2.
6. according to claim 1,2,3,4 or 5 described a kind of methods of making straw particle board, it is characterized in that alkali lye is NaOH.
7. according to the described a kind of method of making straw particle board of claim, it is characterized in that preload pressure 1.2～1.5MPa in step 6.
8. according to the described a kind of method of making straw particle board of claim, it is characterized in that preload pressure 1.5MPa in step 6.
9. according to the described a kind of method of making straw particle board of claim, it is characterized in that in step 7 under 150～190 ℃, 2.8～3.2MPa condition, carrying out hot pressing, hot pressing time is 19～21s/mm.
10. according to the described a kind of method of making straw particle board of claim, it is characterized in that in step 7 under 170 ℃, 3.0MPa condition, carrying out hot pressing, hot pressing time is 20s/mm.
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| CNB2007101446151A CN100526038C (en) | 2007-11-16 | 2007-11-16 | A method for preparing straw particle board |
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| CNB2007101446151A CN100526038C (en) | 2007-11-16 | 2007-11-16 | A method for preparing straw particle board |
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| CN101157241A true CN101157241A (en) | 2008-04-09 |
| CN100526038C CN100526038C (en) | 2009-08-12 |
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Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102501283A (en) * | 2011-11-23 | 2012-06-20 | 东北林业大学 | Facing decoration method utilizing wheat straws |
| CN102501285A (en) * | 2011-11-23 | 2012-06-20 | 东北林业大学 | Method for preparing base material of composite floor by adopting corn straw skins |
| CN102976681A (en) * | 2012-12-06 | 2013-03-20 | 青岛文创科技有限公司 | Preparation method of peanut shell cement particle board |
| CN106079022A (en) * | 2016-06-15 | 2016-11-09 | 中南林业科技大学 | A kind of ultra-low formaldehyde release household material preparation method based on fast-growing grass |
| CN106079018A (en) * | 2016-06-15 | 2016-11-09 | 中南林业科技大学 | A kind of preparation method of prosthetic Form aldehyde release household material based on fast-growing grass |
| CN106079021A (en) * | 2016-06-15 | 2016-11-09 | 中南林业科技大学 | Prosthetic Form aldehyde release biology plate preparation method based on fast-growing grass |
| CN107009476A (en) * | 2017-03-29 | 2017-08-04 | 曾华 | A kind of production method of super E0 grades of medium/high density fiber boards |
| CN107382259A (en) * | 2017-06-28 | 2017-11-24 | 常州水精灵环保设备有限公司 | A kind of preparation method of the compound flakeboard of inorganic straw |
| CN107498685A (en) * | 2017-06-16 | 2017-12-22 | 河南安朝板材科技有限公司 | Green straw stalk sheet production method |
| CN107498680A (en) * | 2017-06-16 | 2017-12-22 | 河南安朝板材科技有限公司 | Green rice husk sheet production method |
| CN107498683A (en) * | 2017-06-16 | 2017-12-22 | 河南安朝板材科技有限公司 | Green rice husk, straw stalk sheet production method |
| CN107498684A (en) * | 2017-06-16 | 2017-12-22 | 河南安朝板材科技有限公司 | Green straw, Wheat Straw sheet production method |
| CN109773936A (en) * | 2019-01-23 | 2019-05-21 | 南京林业大学 | A kind of straw board and preparation method thereof and the method for adjusting hardness |
| CN110450258A (en) * | 2019-08-01 | 2019-11-15 | 李珂 | A kind of artificial straw compression plate and preparation method thereof |
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2007
- 2007-11-16 CN CNB2007101446151A patent/CN100526038C/en not_active Expired - Fee Related
Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102501283A (en) * | 2011-11-23 | 2012-06-20 | 东北林业大学 | Facing decoration method utilizing wheat straws |
| CN102501285A (en) * | 2011-11-23 | 2012-06-20 | 东北林业大学 | Method for preparing base material of composite floor by adopting corn straw skins |
| CN102501285B (en) * | 2011-11-23 | 2014-07-02 | 东北林业大学 | Method for preparing base material of composite floor by adopting corn straw skins |
| CN102976681A (en) * | 2012-12-06 | 2013-03-20 | 青岛文创科技有限公司 | Preparation method of peanut shell cement particle board |
| CN106079021A (en) * | 2016-06-15 | 2016-11-09 | 中南林业科技大学 | Prosthetic Form aldehyde release biology plate preparation method based on fast-growing grass |
| CN106079018A (en) * | 2016-06-15 | 2016-11-09 | 中南林业科技大学 | A kind of preparation method of prosthetic Form aldehyde release household material based on fast-growing grass |
| CN106079022A (en) * | 2016-06-15 | 2016-11-09 | 中南林业科技大学 | A kind of ultra-low formaldehyde release household material preparation method based on fast-growing grass |
| CN107009476A (en) * | 2017-03-29 | 2017-08-04 | 曾华 | A kind of production method of super E0 grades of medium/high density fiber boards |
| CN107498685A (en) * | 2017-06-16 | 2017-12-22 | 河南安朝板材科技有限公司 | Green straw stalk sheet production method |
| CN107498680A (en) * | 2017-06-16 | 2017-12-22 | 河南安朝板材科技有限公司 | Green rice husk sheet production method |
| CN107498683A (en) * | 2017-06-16 | 2017-12-22 | 河南安朝板材科技有限公司 | Green rice husk, straw stalk sheet production method |
| CN107498684A (en) * | 2017-06-16 | 2017-12-22 | 河南安朝板材科技有限公司 | Green straw, Wheat Straw sheet production method |
| CN107382259A (en) * | 2017-06-28 | 2017-11-24 | 常州水精灵环保设备有限公司 | A kind of preparation method of the compound flakeboard of inorganic straw |
| CN109773936A (en) * | 2019-01-23 | 2019-05-21 | 南京林业大学 | A kind of straw board and preparation method thereof and the method for adjusting hardness |
| CN110450258A (en) * | 2019-08-01 | 2019-11-15 | 李珂 | A kind of artificial straw compression plate and preparation method thereof |
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| CN100526038C (en) | 2009-08-12 |
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