CN105773784A - Thin type moisture-proof medium-density fiberboard and preparation method thereof - Google Patents
Thin type moisture-proof medium-density fiberboard and preparation method thereof Download PDFInfo
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- CN105773784A CN105773784A CN201610292170.0A CN201610292170A CN105773784A CN 105773784 A CN105773784 A CN 105773784A CN 201610292170 A CN201610292170 A CN 201610292170A CN 105773784 A CN105773784 A CN 105773784A
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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
- 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
- B27N3/04—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
- B27N3/08—Moulding or pressing
-
- 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
- B27N3/10—Moulding of mats
- B27N3/12—Moulding of mats 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
- B27N3/08—Moulding or pressing
- B27N3/18—Auxiliary operations, e.g. preheating, humidifying, cutting-off
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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Wood Science & Technology (AREA)
- Forests & Forestry (AREA)
- Dry Formation Of Fiberboard And The Like (AREA)
Abstract
The invention discloses a thin type moisture-proof medium-density fiberboard. The fiberboard comprises the following raw materials: fiber raw material, isocyanate accounting for 2-6% of the fiber raw material by weight and emulsion paraffin accounting for 0.8-1.2% of the fiber raw material by weight. The preparation method comprises the following steps: (1) taking the fiber raw material which has been dried until the water content is 4-6%; (2) adding the emulsion paraffin into the fiber raw material, uniformly stirring and mixing to obtain an initial mixing material; (3) adding the isocyanate into the initial mixing material, uniformly stirring and mixing to obtain a final mixing material; (4) subjecting the final mixing material to spreading, prepressing treatment and hot briquetting, so as to obtain the thin type moisture-proof medium-density fiberboard. The fiberboard has excellent strength and water-proof effect, the preparation method is simple, the production efficiency is high, the emulsion paraffin is used as the water-proof agent and good in dispersion and liquidity, the amount of the water-proof agent is reduced; the isocyanate is used as the glue, and after gluing, resistance to boiling and aging is excellent.
Description
Technical field
The present invention relates to medium density fibre board (MDF) manufacture field, relate in particular to a kind of slim moistureproof medium density fibre board (MDF) and preparation method thereof
Background technology
Medium density fibre board (MDF) (MDF) is through mechanical separation and chemical treatment means by timber or Plant fiber, add adhesive and waterproofing agent etc., then through a kind of artificial board that high temperature, high-pressure molding are made, it is make the artificial board that furniture is ideal, and moistureproof medium density fibre board (MDF) is used for kitchen furniture, the contour dampness environment of decorations.Meanwhile, recently as the development of various sheet materials, the market competition of MDF cut deal (10～19mm) is growing more intense, and benefit situation allows of no optimist.What the domestic manufacturer of about more than 80% produced is thickness 12mm and above cut deal, but along with furniture, the fast development fitting up particularly packing business, thickness increases in the thin plate market demand of below 12mm (2.5-8mm).
The patent No. is CN103878859A, name is called the preparation method that the Chinese patent of " preparation method of a kind of slim medium density fibre board (MDF) of high protection against the tide " discloses a kind of slim medium density fibre board (MDF) of high protection against the tide, it is mixed to get mixed wood including by raw material pine and fresh poplar, by mixed wood through pre-cooked, steaming and decocting processes, the paraffin defibrator process solution adding molten state is fine, fiber after defibrator process applies phenol-modified tripolycyanamide arteries and veins urea formaldehyde and liquid composite curing agent, fiber sizing is dried, dry run adds powder body waterproofing agent, dried fiber is sorted, mat formation and formed by continuous flat compacting after molding.This invention uses melt paraffin to do waterproofing agent, mobility and bad dispersibility；Wayward, there is the safety problems such as operator's scald；Carrying pipe to need insulation in production, pipeline easily blocks；In the equivalent situation of melt paraffin and paraffin wax emulsions unit consumption, the paraffin consumption using melt paraffin is big, hence it is evident that affect cost.
The patent No. is CN105150350A, name is called that the Chinese patent of " manufacture method of high moistureproof medium and high density fibre panel " discloses the manufacture method of a kind of high moistureproof medium and high density fibre panel, including chipping, screen, steaming and decocting softening, defibrator process, execute waterproofing agent, applying glue, applying firming agent and dyestuff, dry, selecting crude drugs with winnower negative pressure, mat formation, precompressed, hot pressing, cooling, last sanding cutting edge, identifies packaging on request by the stock board after sawing.This invention waterproofing agent addition is the 1.2%～2.0% of fibrous raw material, and waterproofing agent consumption is big；And this invention production sheet material is thickness specification 18mm cut deal.
Summary of the invention
The technical problem to be solved is to provide a kind of intensity and water resistance is excellent, waterproofing agent consumption is few slim moistureproof medium density fibre board (MDF).
In order to solve above-mentioned technical problem, the present invention adopts the following technical scheme that a kind of slim moistureproof medium density fibre board (MDF), including following raw material: fibrous raw material, accounts for the isocyanates of fibrous raw material weight 2～6% and accounts for the emulsified wax of fibrous raw material weight 0.8～1.2%.
Further, the density of described slim moistureproof medium density fibre board (MDF) is 0.84g/cm3, thickness is 2.8～3.2mm.Through overtesting, panel density is less than 0.8g/cm3Time, the fibre board of production is extremely difficult to the standard-required in GB/T11718 2009 medium density fibre board (MDF) national standard.
The preparation method that the present invention also provides for a kind of above-mentioned slim moistureproof medium density fibre board (MDF), comprises the following steps:
(1) take and be dried to the fibrous raw material that moisture content is 4～6%；
(2) emulsified wax is applied in fibrous raw material, is uniformly mixed, obtain just batch mixing；
(3) isocyanates is applied in first batch mixing, is uniformly mixed, obtains whole batch mixing；
(4) whole batch mixing is mated formation, precompressed processes, finally hot-forming, obtains described slim moistureproof medium density fibre board (MDF).
Further, hot-forming condition is: temperature 170～185 DEG C, time 30～36s, pressure 1.5～3.5MPa.Pressure, time, temperature are the hot pressing three elements in Wood-based Panel Production, and for medium density fibre board (MDF), high temperature also can increase timber plasticity while accelerating adhesive solidification, it is simple to compresses slab；High temperature can shorten hot pressing time simultaneously, if overlong time, glue-line occurs aging, affects bonding strength；In hot pressing, temperature is too high, and slab internal steam pressure increases, and release easily occurs slab layering or plate bursting phenomenon too soon；Considering factors above, the present invention selects above-mentioned process conditions can improve the success rate of sheet material hot pressing, and board quality is better.
The invention have the benefit that
1. the present invention adopts emulsified wax as waterproofing agent, emulsion molecule one end in emulsified wax is hydrophilic, one end oleophylic, being a kind of and hydrophilic emulsion hydrophobic again, one end and paraffin form physical bond absorption, to meet waterproof requirement, another activity end, with wood formation hydrogen bonded, or can react to a certain extent with adhesive, and then strengthen the waterproof effect of paraffin；Reduction oil water interfacial tension that can be bigger, forms the interfacial film with certain mechanical strength, and forms a degree of adhesive force between paraffin and timber in wax water termination；Additionally emulsified wax is in use without adding heat fusing or dissolving with solvent, and stability is high, good fluidity, and granule is tiny, and diffusibility and uniformity are good, form certain mechanical strength in wax water termination so that interface film strength increases.Therefore, adopt emulsified wax to be used for the production of MDF as waterproofing agent, paraffin consumption can be reduced, while improving MDF water resistance, can guarantee that again mechanical strength.
2. the present invention adopts isocyanates as adhesive, compared with urea-formaldehyde resin adhesive conventional in medium density fibre board (MDF) production process, isocyanates has stronger reactivity, is particularly suited for the gluing on free energy surface, and water boiling resistance, the ageing-resistant performance after gluing is excellent；And as long as isocyanate glue forms monolayer and can complete glued effect, resin added is greatly reduced.
3. the preparation method of the slim moistureproof medium density fibre board (MDF) of the present invention is simple, it does not have increasing extra production technology, production efficiency is high；The present invention adopts emulsified wax as waterproofing agent, paraffin particles is little, dispersibility and good fluidity, it it is a kind of not only hydrophilic but also hydrophobic emulsion, one end and paraffin form physical bond absorption, to meet waterproof requirement, another activity end, can with wood formation hydrogen bonded, or react to a certain extent with adhesive, and then strengthen the waterproof effect of paraffin, and waterproofing agent consumption can be reduced, the addition of conventional melt paraffin waterproofing agent is 1.0%～2.0% (accounting for fibrous raw material percentage by weight), and waterproofing agent consumption of the present invention is 0.8%～1.2% (accounting for fibrous raw material percentage by weight).
4. the slim moistureproof medium density fibre board (MDF) of the present invention has excellent intensity and waterproof effect, fully achieves or be better than the requirement of country's working standard.
Detailed description of the invention
Below in conjunction with embodiment, the invention will be further described:
The various raw materials that following example use, as being not specifically noted, are commercially available prod well known in the art.Wherein fibrous raw material is purchased from Shanghai, Fuyang thousand wood-based plate Manufacturing Co., Ltd, and in fibrous raw material, the content of crude fibre (staying the fiber on 14 orders) is less than 20%, and the content that fiber fines (stays the fiber of 200 orders) is less than 30%；Surplus is medium-length fibre (staying the fiber of 28-100 order).Fiber separation is meticulous, and fiber fines is too many, and the consumption of adhesive not only can be made to increase, and all can produce harmful effect for dry, molding, hot pressing process, affects exhaust performance when slab pre-compressed effect and hot pressing.The present invention adopts the fibrous raw material of above-mentioned screening value, and between pressed sheet internal fiber, contact surface is big, strong in conjunction with intertexture, sheet material machinability and good mechanical performance；
Isocyanates is purchased from Bayer (China) Co., Ltd.；
Emulsified wax is bought from Han Sheng group, the paraffin wax emulsions made with the mixture of styrene and propenyl benzene and high molecular surfactant (HS) that derivant is monomer thereof and the low-molecular-weight surfactant (LS) of alkylbenzene polyoxy agent vinyl Ether derivant, its solid content is 60%.
Embodiment 1
A kind of slim moistureproof medium density fibre board (MDF), including following raw material: fibrous raw material, account for the isocyanates of fibrous raw material weight 4% and account for the emulsified wax of fibrous raw material weight 0.8%, the density of slim moistureproof medium density fibre board (MDF) is 0.84g/cm3, thickness is 2.8mm.
The preparation method of above-mentioned slim moistureproof medium density fibre board (MDF) comprises the following steps:
(1) take and be dried to the fibrous raw material that moisture content is 4%, stand-by；
(2) blender idle running, puts into fibrous raw material in blender and stirs, and is sprayed by emulsified wax simultaneously and is applied in fibrous raw material, is sufficiently stirred for so as to mix homogeneously, obtains just batch mixing；
(3) under stirring, isocyanates is applied in first batch mixing, is sufficiently stirred for so as to mix homogeneously, obtains whole batch mixing, then hang 5min stand-by；
(4) whole batch mixing is mated formation, precompressed processes, finally hot-forming, obtains described slim moistureproof medium density fibre board (MDF), and hot-forming condition is: temperature 180 DEG C, time 30s, pressure 3.5MPa.
Embodiment 2
A kind of slim moistureproof medium density fibre board (MDF), including following raw material: fibrous raw material, account for the isocyanates of fibrous raw material weight 2% and account for the emulsified wax of fibrous raw material weight 1.0%, the density of slim moistureproof medium density fibre board (MDF) is 0.84g/cm3, thickness is 3.0mm.
The preparation method of above-mentioned slim moistureproof medium density fibre board (MDF) comprises the following steps:
(1) take and be dried to the fibrous raw material that moisture content is 5%, stand-by；
(2) blender idle running, puts into fibrous raw material in blender and stirs, and is sprayed by emulsified wax simultaneously and is applied in fibrous raw material, is sufficiently stirred for so as to mix homogeneously, obtains just batch mixing；
(3) under stirring, isocyanates is applied in first batch mixing, is sufficiently stirred for so as to mix homogeneously, obtains whole batch mixing, then hang 8min stand-by；
(4) whole batch mixing is mated formation, precompressed processes, finally hot-forming, obtains described slim moistureproof medium density fibre board (MDF), and hot-forming condition is: temperature 170 DEG C, time 33s, pressure 2.5MPa.
Embodiment 3
A kind of slim moistureproof medium density fibre board (MDF), including following raw material: fibrous raw material, account for the isocyanates of fibrous raw material weight 6% and account for the emulsified wax of fibrous raw material weight 1.2%, the density of slim moistureproof medium density fibre board (MDF) is 0.84g/cm3, thickness is 3.2mm.
The preparation method of above-mentioned slim moistureproof medium density fibre board (MDF) comprises the following steps:
(1) take and be dried to the fibrous raw material that moisture content is 6%, stand-by；
(2) blender idle running, puts into fibrous raw material in blender and stirs, and is sprayed by emulsified wax simultaneously and is applied in fibrous raw material, is sufficiently stirred for so as to mix homogeneously, obtains just batch mixing；
(3) under stirring, isocyanates is applied in first batch mixing, is sufficiently stirred for so as to mix homogeneously, obtains whole batch mixing, then hang 10min stand-by；
(4) whole batch mixing is mated formation, precompressed processes, finally hot-forming, obtains described slim moistureproof medium density fibre board (MDF), and hot-forming condition is: temperature 185 DEG C, time 36s, pressure 1.5MPa.
Embodiment 4
Performance comparison test
The slim moistureproof medium density fibre board (MDF) of embodiment 1 to 3 is carried out performance test after Balance Treatment, sanding, and contrast with matched group, comparison system adopts the slim medium density fibre board (MDF) that melt paraffin is suppressed as waterproofing agent, melt paraffin addition is 2.0% (accounting for fibrous raw material percentage ratio), and result is shown in table 1 below.
Table 1 performance comparison result
Note: the numerical value of " 3mmMDF Grade A " in form is national Specification numerical value.
As can be seen from the above results, the intensity of the slim moistureproof medium density fibre board (MDF) of the present invention and waterproof effect will be substantially better than matched group and national standard.
Embodiment 5
The performance impact test to slim moistureproof medium density fibre board (MDF) of the hot-forming condition
Hot pressing three elements (time, pressure, temperature) are done Three factors-levels orthogonal test, experimental level and result and see table 2 below and table 3 (for three's impact on MOR):
Table 2 orthogonal test factor level table L9(33)
Table 3 orthogonal experiments
By orthogonal experiments it can be seen that hot pressing time extends, the MOR of fibre board increases, but overlong time, can have a negative impact；Hot pressing pressure increases so that fiber combining point increases, and MOR increases；Hot pressing temperature from 160 DEG C increase to 180 DEG C time, the MOR of sheet material adds about 19.2%, but when temperature is increased to 200 DEG C by 180 DEG C, and MOR increases inconspicuous.Thus present invention determine that preferably hot-forming condition is: hot pressing time 30s～36s, hot pressing pressure 3.0～3.5MPa, hot pressing temperature 170～185 DEG C.
Being to be understood that example as herein described and embodiment are only for illustrating, those skilled in the art can make various amendment or change according to it, when without departing from spirit of the invention, broadly falls into protection scope of the present invention.
Claims (4)
1. a slim moistureproof medium density fibre board (MDF), it is characterised in that include following raw material: fibrous raw material, account for the isocyanates of fibrous raw material weight 2～6% and account for the emulsified wax of fibrous raw material weight 0.8～1.2%.
2. slim moistureproof medium density fibre board (MDF) as claimed in claim 1, it is characterised in that the density of described slim moistureproof medium density fibre board (MDF) is 0.84g/cm3, thickness is 2.8～3.2mm.
3. the preparation method of slim moistureproof medium density fibre board (MDF) as claimed in claim 1 or 2, it is characterised in that comprise the following steps:
(1) take and be dried to the fibrous raw material that moisture content is 4～6%；
(2) emulsified wax is applied in fibrous raw material, is uniformly mixed, obtain just batch mixing；
(3) isocyanates is applied in first batch mixing, is uniformly mixed, obtains whole batch mixing；
(4) whole batch mixing is mated formation, precompressed processes, finally hot-forming, obtains described slim moistureproof medium density fibre board (MDF).
4. the preparation method of slim moistureproof medium density fibre board (MDF) as claimed in claim 3, it is characterised in that hot-forming condition is: temperature 170～185 DEG C, time 30～36s, pressure 1.5～3.5MPa.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610292170.0A CN105773784A (en) | 2016-04-29 | 2016-04-29 | Thin type moisture-proof medium-density fiberboard and preparation method thereof |
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| CN201610292170.0A CN105773784A (en) | 2016-04-29 | 2016-04-29 | Thin type moisture-proof medium-density fiberboard and preparation method thereof |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1227154A (en) * | 1999-01-22 | 1999-09-01 | 南京林业大学 | Method for producing wheat straw flakeboard |
| CN1356202A (en) * | 2001-12-11 | 2002-07-03 | 南京林业大学 | Process for preparing middle-density rice straw board |
| CN1631632A (en) * | 2004-12-23 | 2005-06-29 | 南京林业大学 | Industrialized production method of wheat straw flakeboard |
| CN1785624A (en) * | 2005-10-28 | 2006-06-14 | 南京林业大学 | Industrial production method of aldehyde less thin straw board |
| CN101786287A (en) * | 2010-02-05 | 2010-07-28 | 浙江省林业科学研究院 | Manufacturing method of environment-friendly antiflaming middle and high density fiberboard |
| CN103878859A (en) * | 2014-03-05 | 2014-06-25 | 东营正和木业有限公司 | Method for preparing highly-damp-proof thin type medium density fiberboard |
-
2016
- 2016-04-29 CN CN201610292170.0A patent/CN105773784A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1227154A (en) * | 1999-01-22 | 1999-09-01 | 南京林业大学 | Method for producing wheat straw flakeboard |
| CN1356202A (en) * | 2001-12-11 | 2002-07-03 | 南京林业大学 | Process for preparing middle-density rice straw board |
| CN1631632A (en) * | 2004-12-23 | 2005-06-29 | 南京林业大学 | Industrialized production method of wheat straw flakeboard |
| CN1785624A (en) * | 2005-10-28 | 2006-06-14 | 南京林业大学 | Industrial production method of aldehyde less thin straw board |
| CN101786287A (en) * | 2010-02-05 | 2010-07-28 | 浙江省林业科学研究院 | Manufacturing method of environment-friendly antiflaming middle and high density fiberboard |
| CN103878859A (en) * | 2014-03-05 | 2014-06-25 | 东营正和木业有限公司 | Method for preparing highly-damp-proof thin type medium density fiberboard |
Non-Patent Citations (2)
| Title |
|---|
| 周定国: "《人造板工艺学》", 30 June 2011, 中国林业出版社 * |
| 顾继友: "《胶粘剂与涂料》", 31 January 2007 * |
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