CN102848447B - The preparation method of medium density fibre board (MDF) - Google Patents
The preparation method of medium density fibre board (MDF) Download PDFInfo
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- CN102848447B CN102848447B CN201210358165.7A CN201210358165A CN102848447B CN 102848447 B CN102848447 B CN 102848447B CN 201210358165 A CN201210358165 A CN 201210358165A CN 102848447 B CN102848447 B CN 102848447B
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Abstract
The invention provides a kind of preparation method of medium density fibre board (MDF), by pinus khasys timber is whittled into wood chip, and dry, then carries out defibrator process and soften to being decomposed into fiber, then boiling obtains fibre stuff; Then to add cured to urea-formaldehyde resin adhesive, liquid respectively in fibre stuff and to mix, then carry out drying and spread heap, being then pressed into slab in advance; Finally carry out hot pressing, more namely obtain medium density fibre board (MDF) after cooling, modified, sanding.The present invention with pinus khasys is that main material, steady quality, distortion are little, plate face flat smooth, safe and reliable; Mainly solve long problem low molar ratio urea-formaldehyde resin hardening time, glue consumption is little, improves production efficiency, to reduce cost high; The burst size of methanal of gained medium density fibre board (MDF) is 5.0 ~ 6.0 milligrams/100 grams, reaches environmental protection E0, E1 level.
Description
Technical field
The present invention relates to a kind of preparation method of medium density fibre board (MDF), belong to timber resources and utilize technical field.
Background technology
Medium density fibre board (MDF) (abbreviation MDF) because of its be of close texture, even structure, mechanical property be good, and the feature such as processing characteristics is excellent, make it be widely used, develop swift and violent, become the important board kind that wood-based panel industry is very important.At present, the mdf production line total capacity that China is building reaches 5,680,000 m
3/ a, will put into operation during 2011 in 2010, and wherein continuous strand line ball adds up production capacity is 3,730,000 m
3/ a, accounts for and is building 66% of mdf production line ability.Expect 2010 the end of the year China's MDF total productive capacity will more than 3,650 ten thousand m
3/ a.
There is following problem in existing medium density fibre board (MDF): (1) often occurs that moisture resistance is poor, the problem that after absorption moisture content, the coefficient of expansion is larger; (2) medium density fiber intralamellar part is floury structure, and nail-holding ability is poor, is easy to occur to loosen after screw screws; (3) medium density fibre board (MDF) intensity is not high, and the height making furniture can not be too high, and the overwhelming majority is highly only 2100mm; (4) medium density fibre board (MDF) is when producing, and because of its internal structural characteristic, glue consumption is comparatively large, and environmental protection coefficient is low to a certain extent; (5) moisture content of adhesive to fiber of existing E0, E1 level is more responsive, make in production process medium density fibre board (MDF) super thick and layering wayward; (6) there is the problems such as production cost is high, production efficiency range of decrease degree is large in the medium density fibre board (MDF) arriving environmental protection E0, E1 level.
Summary of the invention
For solving the existing medium density fibre board (MDF) problems such as glue consumption is comparatively large when producing, environmental protection coefficient is low, production cost is high, the invention provides a kind of preparation method of medium density fibre board (MDF), being realized by following technical proposal.
A preparation method for medium density fibre board (MDF), through following each processing step:
(1) get the raw materials ready: pinus khasys timber is whittled into length is 16 ~ 30mm, width is 15 ~ 25mm, thickness is the wood chip of 16 ~ 30mm, and to be dried to moisture content be 34 ~ 50%;
(2) defibrator process: step (1) gained wood chip is carried out defibrator process and softens to being decomposed into fiber, then boiling 6 ~ 8min obtains fibre stuff under temperature 160 ~ 180 DEG C, pressure 0.6 ~ 0.8MPa;
(3) applying glue and cured: to add cured to urea-formaldehyde resin adhesive, liquid respectively in step (2) gained fibre stuff and to mix; Wherein, the addition of urea-formaldehyde resin adhesive is every m
3add 175 ~ 200kg in fibre stuff, the addition of the cured amount of liquid is every m
33.5 ~ 6.5m is added in fibre stuff
3;
(4) dry: by step (3) gained applying glue and cured after the fibre stuff moisture content that carries out being dried to fiber be 8 ~ 12%;
(5) precompressed: step (4) gained fiber is carried out paving heap, then precompressed becomes, and length is 2490mm, width is the slab of 1290mm;
(6) hot pressing: step (5) gained slab is carried out hot pressing, more namely medium density fibre board (MDF) is obtained after cooling, modified, sanding.
Urea-formaldehyde resin adhesive in described step (3) is through the following step and obtains:
(1) formaldehyde of 100 mass parts is warming up to 35 ~ 40 DEG C, with the NaOH solution adjust pH to 7.8 that mass concentration is 30%, add the auxiliary agent A of 0.0028 ~ 0.0030 mass parts and the urea of 34.23 ~ 35.61 mass parts again, after being warming up to 70 DEG C of stopping heating, treat that it is warming up to 88 ~ 90 DEG C of reaction 25 ~ 35min naturally;
(2) by mass concentration be 38 ~ 40% pH value to 4.4 ~ 4.6 of CHOOH solution regulating step (1) gained mixture, then react to cloud point at 88 ~ 92 DEG C; Then be NaOH solution adjust ph to 6.2 ~ 6.3 of 25 ~ 30% by mass concentration, finally add the auxiliary agent A of 0.0032 ~ 0.0039 mass parts, stir and auxiliary agent A is dissolved completely;
(3) in step (2) gained mixture, add the urea of 17.89 ~ 18.56 mass parts, at 85 ~ 92 DEG C reaction to when mixture instillation 70 ~ 75 DEG C of water in be white vaporific time cessation reaction, be NaOH solution adjust ph to 7.5 ~ 7.8 of 25 ~ 30% again by mass concentration, in time being cooled to 75 ~ 80 DEG C, add the urea of 15.45 ~ 16.38 mass parts, then at 65 ~ 70 DEG C, 20min is reacted, add the urea of 8.16 ~ 9.32 mass parts, be stirred to temperature again and be down to 35 ~ 45 DEG C, finally regulate pH value to 7.2 ~ 7.5 by the NaOH solution that mass concentration is 25 ~ 30%, namely urea-formaldehyde resin adhesive is obtained.
Described auxiliary agent A is tapioca.
The hot pressing of described step (6) completes under following pressure and time conditions: first in 20 ~ 30 seconds, boost to 13.5 ~ 19MPa, pressurize 60 ~ 120s again, then in 10 ~ 15 seconds, 3.5 ~ 5.5MPa is decompressed to, in 10 ~ 15 seconds, 6 ~ 8.5MPa is boosted to again after pressurize 65 ~ 135s, continue pressurize 50 ~ 75s, finally in 30 ~ 45 seconds, be decompressed to 0MPa.
The advantage that the present invention has and effect:
(1) the present invention with pinus khasys be that main material, steady quality, distortion are little, plate face flat smooth, safe and reliable;
(2) mainly solve long problem low molar ratio urea-formaldehyde resin hardening time, glue consumption is little, improves production efficiency, to reduce cost high;
(3) burst size of methanal of gained medium density fibre board (MDF) is 5.0 ~ 6.0 milligrams/100 grams, and (burst size of methanal≤5.0 milligram/100 grams, reach environmental protection E to reach environmental protection E0, E1 level
0; And burst size of methanal≤8.0 milligram/100 grams, reach environmental protection E
1level).
Detailed description of the invention
Below in conjunction with embodiment, the present invention will be further described.
Embodiment 1
(1) get the raw materials ready: pinus khasys timber is whittled into length is 30mm, width is 15mm, thickness is the wood chip of 20mm, and to be dried to moisture content be 50%;
(2) defibrator process: step (1) gained wood chip is carried out defibrator process and softens to being decomposed into fiber, then boiling 6min obtains fibre stuff under temperature 180 DEG C, pressure 0.7MPa;
(3) applying glue and cured: to add cured to urea-formaldehyde resin adhesive, liquid respectively in step (2) gained fibre stuff and to mix; Wherein, the addition of urea-formaldehyde resin adhesive is every m
3add 200kg in fibre stuff, the addition of the cured amount of liquid is every m
34.5m is added in fibre stuff
3; Wherein, urea-formaldehyde resin adhesive is through the following step acquisition:
A. the formaldehyde of 100 mass parts is warming up to 40 DEG C, with the NaOH solution adjust pH to 7.8 that mass concentration is 30%, add the tapioca of 0.0028 mass parts and the urea of 35.2 mass parts again, after being warming up to 70 DEG C of stopping heating, treat that it is warming up to 90 DEG C of reaction 25min naturally;
B. be the pH value to 4.6 of CHOOH solution regulating step (1) the gained mixture of 39% by mass concentration, then react to cloud point at 92 DEG C; Then be the NaOH solution adjust ph to 6.2 of 25% by mass concentration, finally add the tapioca of 0.0036 mass parts, stir and tapioca is dissolved completely;
C. in step (2) gained mixture, add the urea of 18.56 mass parts, at 90 DEG C reaction to when mixture instill in 70 DEG C of water be white vaporific time cessation reaction, be the NaOH solution adjust ph to 7.6 of 30% again by mass concentration, in time being cooled to 75 DEG C, add the urea of 15.45 mass parts, then at 68 DEG C, 20min is reacted, add the urea of 9.32 mass parts, be stirred to temperature again and be down to 35 DEG C, finally regulate pH value to 7.4 by the NaOH solution that mass concentration is 28%, namely obtain urea-formaldehyde resin adhesive;
(4) dry: by step (3) gained applying glue and cured after the fibre stuff moisture content that carries out being dried to fiber be 12%;
(5) precompressed: step (4) gained fiber is carried out paving heap, then precompressed becomes, and length is 2490mm, width is the slab of 1290mm;
(6) hot pressing: step (5) gained slab is carried out hot pressing under following pressure and time conditions: first boosted to 19MPa in 20 seconds, pressurize 90s again, then in 10 seconds, 4.5MPa is decompressed to, in 15 seconds, 7.5MPa is boosted to again after pressurize 95s, continue pressurize 50s, finally in 45 seconds, be decompressed to 0MPa; Namely medium density fibre board (MDF) is obtained again after cooling, modified, sanding.
Embodiment 2
(1) get the raw materials ready: pinus khasys timber is whittled into length is 20mm, width is 20mm, thickness is the wood chip of 30mm, and to be dried to moisture content be 40%;
(2) defibrator process: step (1) gained wood chip is carried out defibrator process and softens to being decomposed into fiber, then boiling 7min obtains fibre stuff under temperature 170 DEG C, pressure 0.6MPa;
(3) applying glue and cured: to add cured to urea-formaldehyde resin adhesive, liquid respectively in step (2) gained fibre stuff and to mix; Wherein, the addition of urea-formaldehyde resin adhesive is every m
3add 190kg in fibre stuff, the addition of the cured amount of liquid is every m
33.5m is added in fibre stuff
3; Wherein, urea-formaldehyde resin adhesive is through the following step acquisition:
A. the formaldehyde of 100 mass parts is warming up to 38 DEG C, with the NaOH solution adjust pH to 7.8 that mass concentration is 30%, add the tapioca of 0.0029 mass parts and the urea of 34.23 mass parts again, after being warming up to 70 DEG C of stopping heating, treat that it is warming up to 88 DEG C of reaction 30min naturally;
B. be the pH value to 4.5 of CHOOH solution regulating step (1) the gained mixture of 38% by mass concentration, then react to cloud point at 90 DEG C; Then be the NaOH solution adjust ph to 6.3 of 28% by mass concentration, finally add the tapioca of 0.0032 mass parts, stir and tapioca is dissolved completely;
C. in step (2) gained mixture, add the urea of 18.21 mass parts, at 85 DEG C reaction to when mixture instill in 72 DEG C of water be white vaporific time cessation reaction, be the NaOH solution adjust ph to 7.5 of 28% again by mass concentration, in time being cooled to 78 DEG C, add the urea of 16.12 mass parts, then at 70 DEG C, 20min is reacted, add the urea of 8.82 mass parts, be stirred to temperature again and be down to 40 DEG C, finally regulate pH value to 7.5 by the NaOH solution that mass concentration is 25%, namely obtain urea-formaldehyde resin adhesive;
(4) dry: by step (3) gained applying glue and cured after the fibre stuff moisture content that carries out being dried to fiber be 10%;
(5) precompressed: step (4) gained fiber is carried out paving heap, then precompressed becomes, and length is 2490mm, width is the slab of 1290mm;
(6) hot pressing: step (5) gained slab is carried out hot pressing under following pressure and time conditions: first boosted to 15MPa in 25 seconds, pressurize 60s again, then in 12 seconds, 3.5MPa is decompressed to, in 12 seconds, 6MPa is boosted to again after pressurize 135s, continue pressurize 65s, finally in 35 seconds, be decompressed to 0MPa; Namely medium density fibre board (MDF) is obtained again after cooling, modified, sanding.
Embodiment 3
(1) get the raw materials ready: pinus khasys timber is whittled into length is 16mm, width is 25mm, thickness is the wood chip of 16mm, and to be dried to moisture content be 34%;
(2) defibrator process: step (1) gained wood chip is carried out defibrator process and softens to being decomposed into fiber, then boiling 8min obtains fibre stuff under temperature 160 DEG C, pressure 0.8MPa;
(3) applying glue and cured: to add cured to urea-formaldehyde resin adhesive, liquid respectively in step (2) gained fibre stuff and to mix; Wherein, the addition of urea-formaldehyde resin adhesive is every m
3add 175kg in fibre stuff, the addition of the cured amount of liquid is every m
36.5m is added in fibre stuff
3; Wherein, urea-formaldehyde resin adhesive is through the following step acquisition:
A. the formaldehyde of 100 mass parts is warming up to 35 DEG C, with the NaOH solution adjust pH to 7.8 that mass concentration is 30%, add the tapioca of 0.0030 mass parts and the urea of 35.61 mass parts again, after being warming up to 70 DEG C of stopping heating, treat that it is warming up to 89 DEG C of reaction 35min naturally;
B. be the pH value to 4.4 of CHOOH solution regulating step (1) the gained mixture of 40% by mass concentration, then react to cloud point at 88 DEG C; Then be the NaOH solution adjust ph to 6.3 of 30% by mass concentration, finally add the tapioca of 0.0039 mass parts, stir and tapioca is dissolved completely;
C. in step (2) gained mixture, add the urea of 17.89 mass parts, at 92 DEG C reaction to when mixture instill in 75 DEG C of water be white vaporific time cessation reaction, be the NaOH solution adjust ph to 7.8 of 25% again by mass concentration, in time being cooled to 80 DEG C, add the urea of 16.38 mass parts, then at 65 DEG C, 20min is reacted, add the urea of 8.16 mass parts, be stirred to temperature again and be down to 45 DEG C, finally regulate pH value to 7.2 by the NaOH solution that mass concentration is 30%, namely obtain urea-formaldehyde resin adhesive;
(4) dry: by step (3) gained applying glue and cured after the fibre stuff moisture content that carries out being dried to fiber be 8%;
(5) precompressed: step (4) gained fiber is carried out paving heap, then precompressed becomes, and length is 2490mm, width is the slab of 1290mm;
(6) hot pressing: step (5) gained slab is carried out hot pressing under following pressure and time conditions: first boosted to 13.5MPa in 30 seconds, pressurize 120s again, then in 15 seconds, 5.5MPa is decompressed to, in 10 seconds, 8.5MPa is boosted to again after pressurize 65s, continue pressurize 75s, finally in 30 seconds, be decompressed to 0MPa; Namely medium density fibre board (MDF) is obtained again after cooling, modified, sanding.
Claims (3)
1. a preparation method for medium density fibre board (MDF), is characterized in that through following each processing step:
(1) pinus khasys timber is whittled into length is 16 ~ 30mm, width is 15 ~ 25mm, thickness is the wood chip of 16 ~ 30mm, and to be dried to moisture content be 34 ~ 50%;
(2) step (1) gained wood chip is carried out defibrator process to soften to being decomposed into fiber, then boiling 6 ~ 8min obtains fibre stuff under temperature 160 ~ 180 DEG C, pressure 0.6 ~ 0.8MPa;
(3) urea-formaldehyde resin adhesive, liquid wax to be added respectively in step (2) gained fibre stuff and to mix; Wherein, the addition of urea-formaldehyde resin adhesive is add 175 ~ 200kg in every cubic metre of fibre stuff, and the addition of liquid wax amount is add 3.5 ~ 6.5m in every cubic metre of fibre stuff
3;
(4) moisture content step (3) gained applying glue and the fibre stuff after executing liquid wax being carried out being dried to fiber is 8 ~ 12%;
(5) step (4) gained fiber is carried out paving heap, then precompressed becomes, and length is 2490mm, width is the slab of 1290mm;
(6) step (5) gained slab is carried out hot pressing, namely medium density fibre board (MDF) is obtained again after cooling, modified, sanding, wherein hot pressing completes under following pressure and time conditions: first in 20 ~ 30 seconds, boost to 13.5 ~ 19MPa, pressurize 60 ~ 120 seconds again, then in 10 ~ 15 seconds, 3.5 ~ 5.5MPa is decompressed to, pressurize boosted to 6 ~ 8.5MPa after 65 ~ 135 seconds in 10 ~ 15 seconds again, continued pressurize 50 ~ 75 seconds, finally in 30 ~ 45 seconds, was decompressed to 0MPa.
2. the preparation method of medium density fibre board (MDF) according to claim 1, is characterized in that: the urea-formaldehyde resin adhesive in described step (3) is through the following step and obtains:
A, the formaldehyde of 100 mass parts is warming up to 35 ~ 40 DEG C, with the NaOH solution adjust pH to 7.8 that mass concentration is 30%, add the auxiliary agent A of 0.0028 ~ 0.0030 mass parts and the urea of 34.23 ~ 35.61 mass parts again, after being warming up to 70 DEG C of stopping heating, treat that it is warming up to 88 ~ 90 DEG C of reaction 25 ~ 35min naturally;
B, be pH value to 4.4 ~ 4.6 of the CHOOH solution regulating step a gained mixture of 38 ~ 40% by mass concentration, then react to cloud point at 88 ~ 92 DEG C; Then be NaOH solution adjust ph to 6.2 ~ 6.3 of 25 ~ 30% by mass concentration, finally add the auxiliary agent A of 0.0032 ~ 0.0039 mass parts, stir and auxiliary agent A is dissolved completely;
C, the urea of 17.89 ~ 18.56 mass parts is added in step b gained mixture, at 85 ~ 92 DEG C reaction to when mixture instillation 70 ~ 75 DEG C of water in be white vaporific time cessation reaction, be NaOH solution adjust ph to 7.5 ~ 7.8 of 25 ~ 30% again by mass concentration, in time being cooled to 75 ~ 80 DEG C, add the urea of 15.45 ~ 16.38 mass parts, then at 65 ~ 70 DEG C, 20min is reacted, add the urea of 8.16 ~ 9.32 mass parts, be stirred to temperature again and be down to 35 ~ 45 DEG C, finally regulate pH value to 7.2 ~ 7.5 by the NaOH solution that mass concentration is 25 ~ 30%, namely urea-formaldehyde resin adhesive is obtained.
3. the preparation method of medium density fibre board (MDF) according to claim 2, is characterized in that: described auxiliary agent A is tapioca.
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| CN105382889A (en) * | 2016-01-22 | 2016-03-09 | 栾金榜 | Hot pressing process for plywood |
| CN107880230A (en) * | 2017-12-11 | 2018-04-06 | 云南新泽兴人造板有限公司 | A kind of adhesive-preparing technology of ultralow mole of glue |
| CN108214809A (en) * | 2017-12-29 | 2018-06-29 | 佛山市高明高森木业有限公司 | A kind of production method of fiberboard |
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