CN104416643A - Density board and manufacture method thereof - Google Patents
Density board and manufacture method thereof Download PDFInfo
- Publication number
- CN104416643A CN104416643A CN201310365776.9A CN201310365776A CN104416643A CN 104416643 A CN104416643 A CN 104416643A CN 201310365776 A CN201310365776 A CN 201310365776A CN 104416643 A CN104416643 A CN 104416643A
- Authority
- CN
- China
- Prior art keywords
- isocyanates
- density board
- stalk fibre
- preparation
- density
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
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Classifications
-
- 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
- B27N3/04—Manufacture of substantially flat articles, e.g. boards, from particles or fibres from fibres
-
- 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
- B27N3/002—Manufacture of substantially flat articles, e.g. boards, from particles or fibres characterised by the type of binder
-
- 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
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J175/00—Adhesives based on polyureas or polyurethanes; Adhesives based on derivatives of such polymers
- C09J175/04—Polyurethanes
Abstract
The invention provides a density board and a manufacture method thereof. The density board is manufactured from, by weight, 90 to 98 of straw fibers and 2 to 10 of isocyanate. The manufacture method thereof includes subjecting the straw fibers and the isocyanate to full mixing and vacuum dewatering and drying so that the moisture content of the mixture is 5% to 15%; subjecting raw materials to mat formation by means of an external demolding manner and pre-pressing the raw materials under the pressure of 0.5MPa to 2.5MPa; subsequently, regulating the pressure into 2MPa to 6MPa and performing hot press molding at the temperature of 150 DEG C to 230 DEG C; performing demolding followed by processing to obtain a finished product. According to the density board, crop straws are used, and an adhesive is improved, so that the condition that strength of products is reduced due to deformation caused by water absorption is effectively avoided.
Description
Technical field
The present invention relates to building material technical field, particularly a kind of density board and preparation method thereof.
Background technology
Density board is the material that construction and decoration is often used, and can be divided into high-density plate, density board, low-density plank by the difference of its density.Density board is higher due to the soft impact strength of matter, suppresses rear even density, also easily reprocesses, and is a kind of good material making furniture.High-density plate, be that broken for the polishing of the small-bore timber glue that adds is suppressed at high temperature under high pressure and formed, its shortcoming is that damage ratio is more serious.But, also there is many defects in these products, as low in intensity, water absorption rate is high, yielding.In these products, mostly adopt Lauxite as adhesive, this will cause a large amount of formaldehyde gas to be released, harm health of human body.Therefore, these products need to improve.
Summary of the invention
Cause sweater to produce the problem polluted in order to the raw material solving middle and higher density plate of the prior art is unreasonable, the embodiment of the present invention proposes a kind of density board and preparation method thereof.Described technical scheme is as follows:
Embodiments of the invention propose a kind of density board, are made up of stalk fibre and isocyanates; The weight ratio of wherein said stalk fibre and isocyanates is; Stalk fibre: 90-98; Isocyanates (MDI): 2-10.
Preferred as technique scheme, the weight ratio of described stalk fibre and isocyanates is; Stalk fibre: 95; Isocyanates: 5.
Meanwhile, the embodiment of the present invention also proposed the preparation method of any one density board aforementioned, it is characterized in that, comprises
Stalk fibre is fully mixed with isocyanates, and carries out vacuum dehydration drying, to make the moisture content of described mixture for 5-15%;
By raw material adopt outer stripping means mat formation shaping after, under pressure is 0.5-2.5MPa, carry out precompressed;
Then adjusting pressure is 2-6MPa, carries out hot-forming at temperature 150-230 DEG C;
The laggard row relax of the demoulding obtains finished product.
Preferred as technique scheme, described process comprises: cut out and sand milling.
Preferred as technique scheme, described squeeze time is 20-120 second.
Preferred as technique scheme, the described hot-forming time is 100-250 second.
The invention has the beneficial effects as follows: the invention provides a kind of density board and preparation method thereof, wherein said density board can be medium-density plate or high-density plate.Agricultural crop straw as raw material, can be realized twice laid and guarantee environmental protection by the present invention, and timber intensity and internal bond strength significantly promote simultaneously.The embodiment of the present invention improves adhesive simultaneously, adopts isocyanates (MDI); The so not only cohesive force of reinforcement plate, also can eliminate Form aldehyde release.The reaction of moisture of isocyanates in stalk fibre is combined the problem that effectively can solve the rear intensity of density board water suction distortion and reduce simultaneously.
Detailed description of the invention
Be clearly and completely described technical scheme of the present invention below, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
Embodiments of the invention propose a kind of density board, are made up of stalk fibre and isocyanates; The weight ratio of wherein said stalk fibre and isocyanates is; Stalk fibre: 90-98; Isocyanates (MDI): 2-10.Wherein preferred, the weight ratio of this stalk fibre and isocyanates is; Stalk fibre: 95; Isocyanates: 5.
Wherein said density board can be medium-density plate or high-density plate.Agricultural crop straw as raw material, can be realized twice laid and guarantee environmental protection by the present invention, and timber intensity and internal bond strength significantly promote simultaneously.The embodiment of the present invention improves adhesive simultaneously, adopts isocyanates (MDI); The so not only cohesive force of reinforcement plate, also can eliminate Form aldehyde release.The reaction of moisture of isocyanates in stalk fibre is combined the problem that effectively can solve the rear intensity of density board water suction distortion and reduce simultaneously.
Meanwhile, the embodiment of the present invention also proposed the preparation method of any one density board aforementioned, comprising:
Stalk fibre is fully mixed with isocyanates, and carries out vacuum dehydration drying, to make the moisture content of described mixture for 5-15%;
By raw material adopt outer stripping means mat formation shaping after, under pressure is 0.5-2.5MPa, carry out precompressed;
Then adjusting pressure is 2-6MPa, carries out hot-forming at temperature 150-230 DEG C;
The laggard row relax of the demoulding obtains finished product.
Wherein, described process comprises: cut out and sand milling.Described squeeze time is 20-120 second.The described hot-forming time is 100-250 second.
Prove that the intensity of the density board of the embodiment of the present invention is better than existing density board below by test:
According to national standard to invention product carry out quality testing, measurement result is as shown in table 1, and from the results shown in Table 1, stalk medium density fibre board (MDF) of the present invention meets national standard.
Table 1
Advantage of the present invention shows:
1) agricultural crop straw is first made stalk fibre with physicomechanical processes, prepare middle and higher density plate with fiber as raw material, the shortcoming that to have broken away from stalk powder or wood shavings be raw material.
2) adopt isocyanates (MDI) as adhesive, not only cohesive force is strong, does not also produce Form aldehyde release.
3) indices such as intensity is higher than artificial straw sheet material on market, can meet and exceed the requirement of GB to fiberboard.Utilize above-mentioned under the prerequisite not changing production equipment and the technological process of production, only changing section technical parameter just can realize the production (most high density 1.1) from low-density (least density 0.4) to high-density plate, and under same density become the sheet material indices of output close to or be better than with existing market what generally sell take timber as the sheet material of main material production, especially in internal bond, ubiquitous sheet material internal bond is at 0.3-0.6 in the market, the high-quality product internal bond > 0.55 of national Specification, the product internal bond utilizing my company technique to produce is the highest can > 1.5, therefore the range of application of product increases greatly, from floor, furniture, finishing can be suitable for light-duty liner.
4) in preparation technology, adopt vacuum low temperature dewatering drying process, can not only energy consumption be reduced, priorly raw aqueous rate is declined and contained humidity is mainly present in fibrous inside, be conducive to the bonding of adhesive and hot-forming, thus improve product strength.
The above; be only the specific embodiment of the present invention, protection scope of the present invention is not limited thereto, and is anyly familiar with those skilled in the art in the technical scope that the present invention discloses; change can be expected easily or replace, all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should described be as the criterion with the protection domain of claim.
Claims (6)
1. a density board, is characterized in that, is made up of stalk fibre and isocyanates; The weight ratio of wherein said stalk fibre and isocyanates is: stalk fibre: 90-98; Isocyanates: 2-10.
2. density board according to claim 1, is characterized in that, the weight ratio of described stalk fibre and isocyanates is: stalk fibre: 95; Isocyanates: 5.
3. a preparation method for density board as claimed in claim 1 or 2, is characterized in that, comprises
Stalk fibre is fully mixed with isocyanates, and carries out vacuum dehydration drying, to make the moisture content of described mixture for 5-15%;
By raw material adopt outer stripping means mat formation shaping after, under pressure is 0.5-2.5MPa, carry out precompressed;
Then adjusting pressure is 2-6MPa, carries out hot-forming at temperature 150-230 DEG C;
The laggard row relax of the demoulding obtains finished product.
4. preparation method according to claim 3, is characterized in that, described process comprises: cut out and sand mushroom.
5. preparation method according to claim 3, is characterized in that, described squeeze time is 20-120 second.
6. preparation method according to claim 3, is characterized in that, the described hot-forming time is 100-250 second.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310365776.9A CN104416643A (en) | 2013-08-21 | 2013-08-21 | Density board and manufacture method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310365776.9A CN104416643A (en) | 2013-08-21 | 2013-08-21 | Density board and manufacture method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104416643A true CN104416643A (en) | 2015-03-18 |
Family
ID=52967312
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310365776.9A Pending CN104416643A (en) | 2013-08-21 | 2013-08-21 | Density board and manufacture method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104416643A (en) |
Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1225866A (en) * | 1999-02-12 | 1999-08-18 | 王汉智 | Method for making plate using farm-crop straw and husk as raw material |
| CN1277095A (en) * | 2000-02-22 | 2000-12-20 | 陆仁书 | Middle-density fiber board made of isocyanic ester and wheat and rice starw, and its production process |
| CN1356202A (en) * | 2001-12-11 | 2002-07-03 | 南京林业大学 | Process for preparing middle-density rice straw board |
| CN1864958A (en) * | 2006-06-21 | 2006-11-22 | 南京大学 | Middle-density fiber board made by smooth cord grass and method for making same |
| CN1887550A (en) * | 2006-07-12 | 2007-01-03 | 南京大学 | Medium-density fiber board made with beach mallow stalk and its making process |
| WO2007025292A2 (en) * | 2005-08-26 | 2007-03-01 | Premomcne, L.L.C. | Medium density fibreboard |
| CN101037000A (en) * | 2007-04-12 | 2007-09-19 | 上海康拜环保科技有限公司 | Method for producing formaldehyde-free low-density crop straw grain board |
| CN101058207A (en) * | 2007-05-24 | 2007-10-24 | 石家庄铁道学院 | Maize stalk and/or wheat stalk composite board and its manufacturing method |
| TW200808509A (en) * | 2006-08-02 | 2008-02-16 | shi-zhong Xu | Method for manufacturing straw boards |
| US20110308694A1 (en) * | 2005-08-26 | 2011-12-22 | Promomcne, Llc | Medium Density Fibreboard |
-
2013
- 2013-08-21 CN CN201310365776.9A patent/CN104416643A/en active Pending
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1225866A (en) * | 1999-02-12 | 1999-08-18 | 王汉智 | Method for making plate using farm-crop straw and husk as raw material |
| CN1277095A (en) * | 2000-02-22 | 2000-12-20 | 陆仁书 | Middle-density fiber board made of isocyanic ester and wheat and rice starw, and its production process |
| CN1356202A (en) * | 2001-12-11 | 2002-07-03 | 南京林业大学 | Process for preparing middle-density rice straw board |
| WO2007025292A2 (en) * | 2005-08-26 | 2007-03-01 | Premomcne, L.L.C. | Medium density fibreboard |
| US20110308694A1 (en) * | 2005-08-26 | 2011-12-22 | Promomcne, Llc | Medium Density Fibreboard |
| CN1864958A (en) * | 2006-06-21 | 2006-11-22 | 南京大学 | Middle-density fiber board made by smooth cord grass and method for making same |
| CN1887550A (en) * | 2006-07-12 | 2007-01-03 | 南京大学 | Medium-density fiber board made with beach mallow stalk and its making process |
| TW200808509A (en) * | 2006-08-02 | 2008-02-16 | shi-zhong Xu | Method for manufacturing straw boards |
| CN101037000A (en) * | 2007-04-12 | 2007-09-19 | 上海康拜环保科技有限公司 | Method for producing formaldehyde-free low-density crop straw grain board |
| CN101058207A (en) * | 2007-05-24 | 2007-10-24 | 石家庄铁道学院 | Maize stalk and/or wheat stalk composite board and its manufacturing method |
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| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20150318 |