CN104690802A - Wood residue and rice hull multilayer composite plate and preparation method thereof - Google Patents
Wood residue and rice hull multilayer composite plate and preparation method thereof Download PDFInfo
- Publication number
- CN104690802A CN104690802A CN201510089764.7A CN201510089764A CN104690802A CN 104690802 A CN104690802 A CN 104690802A CN 201510089764 A CN201510089764 A CN 201510089764A CN 104690802 A CN104690802 A CN 104690802A
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- China
- Prior art keywords
- rice husk
- wood
- wood residue
- multilayer composite
- residue
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27N—MANUFACTURE BY DRY PROCESSES OF ARTICLES, WITH OR WITHOUT ORGANIC BINDING AGENTS, MADE FROM PARTICLES OR FIBRES CONSISTING OF WOOD OR OTHER LIGNOCELLULOSIC OR LIKE ORGANIC MATERIAL
- B27N1/00—Pretreatment of moulding material
- B27N1/02—Mixing the material with binding agent
- B27N1/0209—Methods, e.g. characterised by the composition of the agent
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27N—MANUFACTURE BY DRY PROCESSES OF ARTICLES, WITH OR WITHOUT ORGANIC BINDING AGENTS, MADE FROM PARTICLES OR FIBRES CONSISTING OF WOOD OR OTHER LIGNOCELLULOSIC OR LIKE ORGANIC MATERIAL
- B27N3/00—Manufacture of substantially flat articles, e.g. boards, from particles or fibres
- B27N3/02—Manufacture of substantially flat articles, e.g. boards, from particles or fibres from particles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27N—MANUFACTURE BY DRY PROCESSES OF ARTICLES, WITH OR WITHOUT ORGANIC BINDING AGENTS, MADE FROM PARTICLES OR FIBRES CONSISTING OF WOOD OR OTHER LIGNOCELLULOSIC OR LIKE ORGANIC MATERIAL
- B27N3/00—Manufacture of substantially flat articles, e.g. boards, from particles or fibres
- B27N3/08—Moulding or pressing
Abstract
The invention relates to a composite plate and a processing method thereof, in particular to a wood residue and rice hull multilayer composite plate, and a preparation method thereof, and solves the technical problems of high cost and difficult secondary processing of a rice hull plate during rice hull plate manufacturing. The wood residue and rice hull multilayer composite plate is characterized in that sizing is carried out after rice hulls are treated sequentially through grinding, screening and drying; sizing is carried out after wood residues are dried; a layer of the wood residues, a layer of the rice hulls, and another layer of the wood residues are laid in sequence, or a layer of the wood residues, a layer of the mixture of the rice hulls and the wood residues, and another layer of the wood residues are laid in sequence; the composite plate is obtained after prepressing and hot pressing; isocyanate adhesive is applied in the rice hulls, and urea-formaldehyde resin adhesive, in which an ammonium chloride solution serves as a curing agent, is applied in the wood residues. The wood residue and rice hull multilayer composite plate adopting the structure can avoid the plate sticking phenomenon in the ordinary rice hull plate hot pressing process, so as to dispense with oiling of a steel plate and other plate sticking prevention procedures in the ordinary rice hull plate hot pressing process, facilitate secondary processing of the formed plate, and improve the static bending intensity, elasticity modulus and internal bond strength.
Description
Technical field
The present invention relates to a kind of composite board and processing method thereof.
Background technology
Prior art is in the process manufacturing Hull board, nearly all obtain Hull board by hot-forming mode after being mixed with rice husk by isocyanate glue, but in the process of obtained Hull board, there will be the phenomenon of haftplatte, although some researchers have employed the problem that the mode of putting the oil on the steel plate of hot pressing solves haftplatte, this adds the cost of Hull board manufacture process undoubtedly, putting into production will be a troublesome procedure, and obtained Hull board is due to the rice husk directly exposed surface at plate, add the character of the non cohesive gel of rice husk own, very large difficulty can be run in the process of the secondary operations such as facing, directly affect Hull board decoration after manufacturing, the economic benefit of the Hull board of gained will decline greatly.
Summary of the invention
The invention solves the technical problem of the high and Hull board secondary operations difficulty of cost in Hull board manufacture process; And wood residue-rice husk multilayer composite sheet and preparation method thereof is provided.The present invention adopts layering to mat formation, it is that the urea-formaldehyde resin adhesive of curing agent is to Timber residuals applying glue that top layer adopts with ammonium chloride solution, sandwich layer adopts isocyanate glue to rice husk applying glue, the flooring mode on top layer-sandwich layer-top layer is adopted to mat formation, interpenetrate through precompressed with between hot-forming top layer and sandwich layer, between define transition zone, linked into an integrated entity by transition zone, obtained sheet material both there will not be haftplatte phenomenon in hot pressing, facilitate again the secondary operations in rice husk composite plate later stage, such preparation method is simple and effective solve Hull board produce in and later-stage secondary difficult processing with the problem overcome, the production cost of rice husk composite plate will be reduced, improve the economic benefit of rice husk composite plate.
Wood residue in the present invention-rice husk multilayer composite sheet is that rice husk carries out grinding, sieving and dry process after dryer sizing successively, the dry after dryer sizing of wood residue, then mat formation, then through precompressed, hot-forming composite plate by the order of the mixture-wood residue of wood residue-rice husk-wood residue or wood residue-rice husk and wood residue; Wherein, rice husk applies isocyanate glue, and wood residue applying take ammonium chloride solution as the urea-formaldehyde resin adhesive of curing agent.
The preparation method of wood residue in the present invention-rice husk multilayer composite sheet carries out in the steps below:
Step one, respectively following process is carried out to rice husk and wood residue:
Ground by rice husk, dry after screening, apply isocyanate glue, isocyanates consumption is 4.5% ~ 10% of rice husk absolute dry mass,
Wood residue is dry, applying take ammonium chloride solution as the urea-formaldehyde resin adhesive of curing agent, Lauxite consumption is 7% ~ 16% of wood particle absolute dry mass, and ammonium chloride solution accounts for 4% ~ 13% of Lauxite quality, and the mass percent concentration of ammonium chloride solution is 20%;
Step 2, then mat formation by the order of the mixture-wood residue of wood residue-rice husk-wood residue or wood residue-rice husk and wood residue, precompressed, obtains wood residue-rice husk multilayer composite sheet after hot-forming.
Further restriction, in step one, rice husk is dried to moisture content≤6%.
In step one, wood residue particle drying is to moisture content≤6%, the convenient moisture content controlling upper and lower top layer slab, some water or paraffin water repellent (controlling the mat moisture content of wood shavings layer 12%-13%) can be added in the process of applying glue, be also convenient to spraying of urea-formaldehyde glue.
The solids content of Lauxite described in step one was 60% ~ 65% (in mass).
Wood residue described in step one is wood particle, wood chip, sawdust or wood powder.
Hot pressing temperature described in step 2 is 170 DEG C ~ 200 DEG C, and hot pressing time is 20s/mm ~ 40s/mm, and hot pressing pressure is 3MPa ~ 4MPa.
Squeeze time described in step 2 is 30s ~ 50s.
The plate property of wood residue of the present invention-rice husk multilayer composite sheet is as follows: MOR >=15MPa, MOE >=3000MPa, internal bond strength >=0.35MPa, 2h thickness swelling rate≤8.0%, each performance indications all meet the regulation of GB GB/T4897.3-2003.
The present invention is novel composite plate Materials And Manufacturing Processes, both by the wood utilization of leftover pieces remaining in industrial production, having improved the utilization rate of timber, can be used agriculturally remaining a large amount of rice husks again, the atmosphere pollution that minimizing is burned discarded rice husk and caused, has public welfare.
Sheet material of the present invention is sandwich structure, layering hot pressing of mating formation is adopted to form, upper layer is the wood residue layer applying with ammonium chloride the Lauxite applying glue being curing agent, intermediate core layer is apply the rice husk layer of isocyanates applying glue or the mixed layer of applying glue rice husk and wood residue, this structure can avoid the haftplatte phenomenon produced in general Hull board hot pressing, decrease in general Hull board hot pressing the operation of Antistickings such as putting the oil on steel plate, facilitate again the secondary operations after plate forming, and top layer wood shavings layer effectively can improve MOR and the elastic modelling quantity of Hull board, sandwich layer is the interpolation of composite board due to wood shavings of the mixture of Timber residuals and rice husk, the internal bond strength of rice husk composite plate effectively can be improved in original performance basis.And the flooring mode of flooring mode and particieboard is similar, the process equipment can produced with reference to particieboard in large-scale production, is convenient to the large-scale production promoted from now on.Sheet material burst size of methanal of the present invention is all less than about 5.0mg/100g.So no matter from environmental angle or the angle of performance, a new direction of sheet material development after all can yet be regarded as.
Detailed description of the invention one: in present embodiment, wood shavings-rice husk multilayer composite sheet composite plate design density is 0.77g/cm
3, composite plate thickness is 20mm; Rice husk and the maximum absolute dry mass of wood shavings are than being 13:7, and concrete preparation method carries out in the steps below:
Step one, respectively following process is carried out to rice husk and wood residue:
Sieve after rice husk is ground, removing fine debris, be dried to moisture content less than 6%, then use isocyanates glue mixing, isocyanates consumption is 6% of rice husk oven dry weight,
Be less than 6% by particle drying to moisture content, applying take ammonium chloride solution as the Lauxite glue mixing of curing agent again, Lauxite consumption is 9% of wood residue oven dry weight, ammonium chloride solution accounts for 6.0% of Lauxite quality, the mass percent concentration of described ammonium chloride solution is 20%, and the solids content of Lauxite is 61.5%;
Step 2, then mat formation by the order of wood shavings-rice husk-wood shavings (levels mat formation wood shavings consumption identical), precompressed 30s (compacting), obtains wood shavings-rice husk multilayer composite sheet after hot-forming;
Hot pressing temperature wherein described in step 2 is 180 DEG C, and hot pressing time is 40s/mm, and hot pressing pressure is 4.5MPa.
The MOR of the wood shavings-rice husk multilayer composite sheet of present embodiment is 19.0MPa, MOE is 3490MPa, and internal bond strength is 0.50MPa, 2h thickness swelling rate is 6.9%.
Detailed description of the invention two: present embodiment and detailed description of the invention one unlike: in step one, isocyanates consumption is 7% of rice husk oven dry weight, Lauxite consumption is 14% of wood residue oven dry weight, ammonium chloride solution accounts for 6.0% of Lauxite weight, rice husk and wood shavings absolute dry mass are than being 7:3 (levels mat formation wood shavings consumption identical), and composite plate design density is 0.77g/cm
3, in step 2, hot pressing temperature is 190 DEG C, and hot pressing time is 25s/mm, and hot pressing pressure is 4MPa.Other step is identical with detailed description of the invention one with parameter.
The MOR of the wood shavings-rice husk multilayer composite sheet of present embodiment is 19.3MPa, MOE is 3410MPa, and internal bond strength is 0.66MPa, 2h thickness swelling rate is 6.6%.
Detailed description of the invention three: present embodiment and detailed description of the invention one unlike: in step one, isocyanates consumption is 7% of rice husk oven dry weight, Lauxite consumption is 13% of wood residue oven dry weight, ammonium chloride solution accounts for 7.0% of Lauxite weight, rice husk and wood shavings absolute dry mass are than being 11:9 (levels mat formation wood shavings consumption identical), and composite plate design density is 0.79g/cm
3, in step 2, hot pressing temperature is 180 DEG C, and hot pressing time is 25s/mm, and hot pressing pressure is 4.5MPa.Other step is identical with detailed description of the invention one with parameter.
The MOR of the wood shavings-rice husk multilayer composite sheet of present embodiment is 22.7MPa, MOE is 4130MPa, and internal bond strength is 0.82MPa, 2h thickness swelling rate is 6.0%.
Detailed description of the invention four: present embodiment and detailed description of the invention one unlike: in step one, isocyanates consumption is 5% of rice husk oven dry weight, Lauxite consumption is 12% of wood residue oven dry weight, ammonium chloride solution accounts for 6.0% of Lauxite weight, rice husk and wood shavings absolute dry mass are than being 3:2 (levels mat formation wood shavings consumption identical), and composite plate design density is 0.79g/cm
3, in step 2, hot pressing temperature is 200 DEG C, and hot pressing time is 20s/mm, and hot pressing pressure is 3.5MPa.Other step is identical with detailed description of the invention one with parameter.
The MOR of the wood shavings-rice husk multilayer composite sheet of present embodiment is 21.3MPa, MOE is 4090MPa, and internal bond strength is 0.47MPa, 2h thickness swelling rate is 6.4%.
Detailed description of the invention five: present embodiment and detailed description of the invention one unlike: in step one, isocyanates consumption is 5% of rice husk oven dry weight, Lauxite consumption is 13% of wood residue oven dry weight, ammonium chloride solution accounts for 8.0% of Lauxite weight, rice husk and wood shavings absolute dry mass are than being 11:9 (levels mat formation wood shavings consumption identical), and composite plate design density is 0.83g/cm
3, in step 2, hot pressing temperature is 180 DEG C, and hot pressing time is 45s/mm, and hot pressing pressure is 2.5MPa.Other step is identical with detailed description of the invention one with parameter.
The MOR of the wood shavings-rice husk multilayer composite sheet of present embodiment is 20.6MPa, MOE is 3860MPa, and internal bond strength is 0.47MPa, 2h thickness swelling rate is 7.5%.
Detailed description of the invention six: present embodiment and detailed description of the invention one unlike: in step one, isocyanates consumption is 6% of rice husk oven dry weight, Lauxite consumption is 14% of wood residue oven dry weight, ammonium chloride solution accounts for 10.0% of Lauxite weight, rice husk and wood shavings absolute dry mass are than being 9:11 (levels mat formation wood shavings consumption identical), and composite plate design density is 0.83g/cm
3, in step 2, hot pressing temperature is 170 DEG C, and hot pressing time is 30s/mm, and hot pressing pressure is 4MPa.Other step is identical with detailed description of the invention one with parameter.
The MOR of the wood shavings-rice husk multilayer composite sheet of present embodiment is 21.6MPa, MOE is 4440MPa, and internal bond strength is 0.56MPa, 2h thickness swelling rate is 4.6%.
Detailed description of the invention seven: present embodiment unlike: in step one, isocyanates consumption is 5% of rice husk oven dry weight, Lauxite consumption is 11% of wood residue oven dry weight, the ammonium chloride solution of 20% accounts for 9.0% of Lauxite weight, rice husk and wood shavings absolute dry mass are than being 1:1 (levels mat formation wood shavings consumption identical), and composite plate design density is 0.85g/cm
3, in step 2, hot pressing temperature is 170 DEG C, and hot pressing time is 20s/mm, hot pressing pressure: 3MPa.Other step is identical with detailed description of the invention one with parameter.
The MOR of the wood shavings-rice husk multilayer composite sheet of present embodiment is 21.0MPa, MOE is 4030MPa, and internal bond strength is 0.50MPa, 2h thickness swelling rate is 7.1%.
Detailed description of the invention eight: in present embodiment, the preparation method of wood residue-rice husk multilayer composite sheet carries out in the steps below:
The composite plate design density of wood shavings in present embodiment-rice husk multilayer composite sheet is 0.78g/cm
3, composite plate thickness is 20mm, and top layer is 2:3 with the absolute dry mass ratio of sandwich layer, and concrete preparation method carries out in the steps below:
Step one, respectively following process is carried out to rice husk and wood residue:
Sieve after being ground by rice husk, being dried to moisture content is less than 6%, then uses isocyanates glue mixing, and isocyanates consumption is 6% of rice husk oven dry weight,
Be less than 6% by particle drying to moisture content, be divided into after two parts respectively with ammonium chloride solution and Lauxite glue mixing that mass percent concentration is 20%, wood shavings Lauxite consumption used in top layer is 12.5% of top layer wood residue oven dry weight, sandwich layer wood shavings Lauxite consumption used is 9.5% of sandwich layer ovendriedwood residue weight, ammonium chloride solution accounts for 6.0% of Lauxite weight, and the solids content of described Lauxite is 63.21%;
Step 2, then to mat formation by the order of wood shavings-rice husk and wood shavings mixture (rice husk namely executing isocyanate glue and the mixture after the top layer wood shavings Homogeneous phase mixing executing urea-formaldehyde resin adhesive)-wood shavings (levels mat formation wood shavings consumption identical), precompressed 30s (compacting), obtains wood shavings-rice husk multilayer composite sheet after hot-forming;
Hot pressing temperature wherein described in step 2 is 180 DEG C, and hot pressing time is 25s/mm, and hot pressing pressure is 3.1MPa, and its mesexine wood shavings, sandwich layer wood shavings are 50:6:69 with the absolute dry mass ratio of rice husk.
The MOR of the wood shavings-rice husk multilayer composite sheet of present embodiment is 20.0MPa, MOE is 3370MPa, and internal bond strength is 0.41MPa, 2h thickness swelling rate is 6.6%.
Detailed description of the invention nine: present embodiment and detailed description of the invention eight unlike: top layer wood shavings, sandwich layer wood shavings and rice husk absolute dry mass are than being 50:12:63 (levels mat formation wood shavings consumption identical).Other step is identical with detailed description of the invention eight with parameter.
The MOR of the wood shavings-rice husk multilayer composite sheet of present embodiment is 20.0MPa, MOE is 3810MPa, and internal bond strength is 0.43MPa, 2h thickness swelling rate is 5.9%.
Detailed description of the invention ten: present embodiment and detailed description of the invention eight unlike: top layer wood shavings, sandwich layer wood shavings and rice husk absolute dry mass are than being 50:18:57 (levels mat formation wood shavings consumption identical).Other step is identical with detailed description of the invention eight with parameter.
The MOR of the wood shavings-rice husk multilayer composite sheet of present embodiment is 21.5MPa, MOE is 3660MPa, and internal bond strength is 0.50MPa, 2h thickness swelling rate is 5.2%.
Detailed description of the invention 11: present embodiment and detailed description of the invention eight unlike: top layer wood shavings, sandwich layer wood shavings and rice husk absolute dry mass are than being 50:24:51 (levels mat formation wood shavings consumption identical).Other step is identical with detailed description of the invention eight with parameter.
The MOR of the wood shavings-rice husk multilayer composite sheet of present embodiment is 20.9MPa, MOE is 3510MPa, and internal bond strength is 0.51MPa, 2h thickness swelling rate is 6.8%.
Detailed description of the invention 12: present embodiment and detailed description of the invention eight unlike: top layer wood shavings, sandwich layer wood shavings and rice husk absolute dry mass are than being 50:30:45 (levels mat formation wood shavings consumption identical).Other step is identical with detailed description of the invention eight with parameter.
The MOR of the wood shavings-rice husk multilayer composite sheet of present embodiment is 21.1MPa, MOE is 3490MPa, and internal bond strength is 0.55MPa, 2h thickness swelling rate is 5.7%.
Claims (10)
1. wood residue-rice husk multilayer composite sheet, it is characterized in that wood residue-rice husk multilayer composite sheet is that rice husk carries out grinding, sieving and dry process after dryer sizing successively, the dry after dryer sizing of wood residue, then mat formation, then through precompressed, hot-forming composite plate by the order of the mixture-wood residue of wood residue-rice husk-wood residue or wood residue-rice husk and wood residue; Wherein, rice husk applies isocyanate glue, and wood residue applying take ammonium chloride solution as the urea-formaldehyde resin adhesive of curing agent.
2. the preparation method of wood residue according to claim 1-rice husk multilayer composite sheet, is characterized in that the preparation method of wood residue-rice husk multilayer composite sheet carries out in the steps below:
Step one, respectively following process is carried out to rice husk and wood residue:
Ground by rice husk, dry after screening, apply isocyanate glue, isocyanates consumption is 4.5% ~ 10% of rice husk absolute dry mass,
Wood residue is dry, applying take ammonium chloride solution as the urea-formaldehyde resin adhesive of curing agent, Lauxite consumption is 7% ~ 16% of wood particle absolute dry mass, and ammonium chloride solution accounts for 4% ~ 13% of Lauxite quality, and the mass percent concentration of ammonium chloride solution is 20%;
Step 2, then mat formation by the order of the mixture-wood residue of wood residue-rice husk-wood residue or wood residue-rice husk and wood residue, precompressed, obtains wood residue-rice husk multilayer composite sheet after hot-forming.
3. the preparation method of wood residue according to claim 2-rice husk multilayer composite sheet, is characterized in that in step one, rice husk is dried to moisture content≤6%.
4. the preparation method of wood residue according to claim 3-rice husk multilayer composite sheet, is characterized in that in step one, wood residue is dried to moisture content≤6%.
5. the preparation method of wood residue according to claim 4-rice husk multilayer composite sheet, is characterized in that the solids content of Lauxite described in step one is 60% ~ 65%.
6. the preparation method of wood residue according to claim 5-rice husk multilayer composite sheet, is characterized in that rice husk grinds by step one, carries out drying after removing tiny rice husk with 20 mesh sieve screenings.
7. the preparation method of wood residue according to claim 6-rice husk multilayer composite sheet, is characterized in that wood residue described in step one is wood shavings, wood chip, sawdust or wood powder.
8. according to the preparation method of the wood residue in claim 2-7 described in any one claim-rice husk multilayer composite sheet, it is characterized in that the hot pressing temperature described in step 2 is 170 DEG C ~ 200 DEG C, hot pressing time is 20s/mm ~ 40s/mm, and hot pressing pressure is 3MPa ~ 4MPa.
9., according to the preparation method of the wood residue in claim 2-7 described in any one claim-rice husk multilayer composite sheet, it is characterized in that the hot pressing temperature described in step 2 is 180 DEG C, hot pressing time is 30s/mm, and hot pressing pressure is 4MPa.
10. the preparation method of wood residue according to claim 8-rice husk multilayer composite sheet, is characterized in that the squeeze time described in step 2 is 30s ~ 50s.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510089764.7A CN104690802A (en) | 2015-02-27 | 2015-02-27 | Wood residue and rice hull multilayer composite plate and preparation method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510089764.7A CN104690802A (en) | 2015-02-27 | 2015-02-27 | Wood residue and rice hull multilayer composite plate and preparation method thereof |
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| CN104690802A true CN104690802A (en) | 2015-06-10 |
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| CN201510089764.7A Pending CN104690802A (en) | 2015-02-27 | 2015-02-27 | Wood residue and rice hull multilayer composite plate and preparation method thereof |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105599109A (en) * | 2015-12-30 | 2016-05-25 | 卓达新材料科技集团有限公司 | Cement-rice hull exterior wall decoration board and production method thereof |
| CN106346588A (en) * | 2016-08-21 | 2017-01-25 | 天津市吉利光大包装有限公司 | Method for manufacturing packaging boards from leftover materials |
| CN115213986A (en) * | 2022-07-26 | 2022-10-21 | 北京林业大学 | Outdoor plant shell-based glue layer-coating integrated formed paint-free artificial board |
-
2015
- 2015-02-27 CN CN201510089764.7A patent/CN104690802A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105599109A (en) * | 2015-12-30 | 2016-05-25 | 卓达新材料科技集团有限公司 | Cement-rice hull exterior wall decoration board and production method thereof |
| CN105599109B (en) * | 2015-12-30 | 2018-05-22 | 卓达新材料科技集团有限公司 | A kind of cement rice husk decorative plate of outer wall and preparation method thereof |
| CN106346588A (en) * | 2016-08-21 | 2017-01-25 | 天津市吉利光大包装有限公司 | Method for manufacturing packaging boards from leftover materials |
| CN115213986A (en) * | 2022-07-26 | 2022-10-21 | 北京林业大学 | Outdoor plant shell-based glue layer-coating integrated formed paint-free artificial board |
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Application publication date: 20150610 |