Preparation method of flame-retardant medium-density fiberboard

Abstract

The invention discloses a preparation method of a flame-retardant medium-density fiberboard and belongs to the technical field of building material preparation. According to the preparation method, salix fibers and biogas slurry are mixed for mildewing, washing and drying are conducted, and pre-treated salix fibers are obtained; then the pre-treated salix fibers are mixed with a saturated impregnation solution containing sodium nitrite and ammonium chloride for impregnation, then liquid nitrogen freezing is conducted, and frozen salix fibers are obtained; then the frozen salix fibers are fumigated through nitrogen carrying trimethyl aluminum and dried, and the fumigated salix fibers are obtained; and finally the fumigated salix fibers and resin adhesives are mixed and then laid to form a board blank, graded pressing formation and cutting are conducted, and accordingly the flame-retardant medium-density fiberboard is obtained. The obtained flame-retardant medium-density fiberboard has both the excellent flame-retardant performance and the excellent physical and mechanical performance.

Description

technical field

[0001] The invention discloses a method for preparing a flame-retardant medium-density fiberboard, which belongs to the technical field of building material preparation. Background technique

[0002] Medium-density fiberboard is made of wood fiber or other plant fiber, applied with synthetic resin or other suitable adhesives and additives, and pressed in a hot press under high temperature and certain pressure, with a density of 0.45-0.88g / cm 3 homogeneous plates. Medium density fiberboard has lower requirements on raw materials, uniform internal structure, moderate density, better physical and mechanical properties, bending strength, impact strength, internal bonding force, etc. are higher than ordinary particleboard. Secondly, the medium density fiberboard has a large format size, smooth surface, good coating performance and decorative veneer effect, good machining performance, sawing, drilling, birch opening, milling, sanding and other processing performan...

Examples

example 1

[0021] According to the mass ratio of 1:3, add salix wood fiber and biogas slurry into the mixer, stir and mix for 45 minutes at a speed of 500r / min to obtain a mixture, and then evenly spread the obtained mixture on a tray, and Move the trays into the greenhouse, under the conditions of temperature 32°C and humidity 80%, let it stand for moldy at constant temperature and humidity for 15 days, then wash the moldy mixture with deionized water 6 times, and move the washed mixture into the oven , dried at a temperature of 110°C to constant weight to obtain pretreated Salix wood fibers; then the pretreated Salix wood fibers and saturated impregnation solution were added to the water tank at a mass ratio of 1:60, and the temperature was 45 Under the condition of ℃, soak at constant temperature for 24 hours, filter to obtain the filter residue, drain the water, and dry it naturally until the moisture content of the filter residue is 30%, then spray and freeze the naturally dried filt...

example 2

[0023]According to the mass ratio of 1:2, add salix wood fiber and biogas slurry into the mixer, stir and mix for 40 minutes at a speed of 400r / min to obtain a mixture, and then evenly spread the obtained mixture on a tray, and Move the trays into the greenhouse, under the conditions of temperature 30°C and humidity 75%, let it stand for 13 days to mold at constant temperature and humidity, then wash the moldy mixture 5 times with deionized water, and move the washed mixture into the oven , dried at a temperature of 107°C to constant weight to obtain pretreated Salix wood fibers; Under the condition of ℃, soak at constant temperature for 18 hours, filter to obtain the filter residue, drain the water, and dry naturally until the moisture content of the filter residue is 25%, and then spray and freeze the naturally dried filter residue 50% with liquid nitrogen to obtain the frozen salix wood fiber Set up a layer of barbed wire in the middle of the reaction kettle, and evenly spr...

example 3

[0025] According to the mass ratio of 1:1, add salix wood fiber and biogas slurry into the mixer, stir and mix for 30 minutes at a speed of 300r / min to obtain a mixture, and then evenly spread the obtained mixture on a tray, and Move the tray into the greenhouse, and let it stand for 10 days at constant temperature and humidity under the conditions of temperature 28°C and humidity 70% to mold, then wash the moldy mixture 4 times with deionized water, and move the washed mixture into the oven , dried at a temperature of 105°C to constant weight to obtain pretreated Salix wood fibers; Under the condition of ℃, soak at a constant temperature for 12 hours, filter to obtain the filter residue, drain the water, and dry it naturally until the moisture content of the filter residue is 20%, then spray and freeze the naturally dried filter residue for 40 seconds with liquid nitrogen to obtain the frozen salix wood fiber Set up a layer of barbed wire in the middle of the reactor, and eve...

technical field

[0001] The invention discloses a method for preparing a flame-retardant medium-density fiberboard, which belongs to the technical field of building material preparation. Background technique

[0002] Medium-density fiberboard is made of wood fiber or other plant fiber, applied with synthetic resin or other suitable adhesives and additives, and pressed in a hot press under high temperature and certain pressure, with a density of 0.45-0.88g / cm 3 homogeneous plates. Medium density fiberboard has lower requirements on raw materials, uniform internal structure, moderate density, better physical and mechanical properties, bending strength, impact strength, internal bonding force, etc. are higher than ordinary particleboard. Secondly, the medium density fiberboard has a large format size, smooth surface, good coating performance and decorative veneer effect, good machining performance, sawing, drilling, birch opening, milling, sanding and other processing performan...

Examples

example 1

[0021] According to the mass ratio of 1:3, add salix wood fiber and biogas slurry into the mixer, stir and mix for 45 minutes at a speed of 500r / min to obtain a mixture, and then evenly spread the obtained mixture on a tray, and Move the trays into the greenhouse, under the conditions of temperature 32°C and humidity 80%, let it stand for moldy at constant temperature and humidity for 15 days, then wash the moldy mixture with deionized water 6 times, and move the washed mixture into the oven , dried at a temperature of 110°C to constant weight to obtain pretreated Salix wood fibers; then the pretreated Salix wood fibers and saturated impregnation solution were added to the water tank at a mass ratio of 1:60, and the temperature was 45 Under the condition of ℃, soak at constant temperature for 24 hours, filter to obtain the filter residue, drain the water, and dry it naturally until the moisture content of the filter residue is 30%, then spray and freeze the naturally dried filt...

example 2

[0023]According to the mass ratio of 1:2, add salix wood fiber and biogas slurry into the mixer, stir and mix for 40 minutes at a speed of 400r / min to obtain a mixture, and then evenly spread the obtained mixture on a tray, and Move the trays into the greenhouse, under the conditions of temperature 30°C and humidity 75%, let it stand for 13 days to mold at constant temperature and humidity, then wash the moldy mixture 5 times with deionized water, and move the washed mixture into the oven , dried at a temperature of 107°C to constant weight to obtain pretreated Salix wood fibers; Under the condition of ℃, soak at constant temperature for 18 hours, filter to obtain the filter residue, drain the water, and dry naturally until the moisture content of the filter residue is 25%, and then spray and freeze the naturally dried filter residue 50% with liquid nitrogen to obtain the frozen salix wood fiber Set up a layer of barbed wire in the middle of the reaction kettle, and evenly spr...

example 3

[0025] According to the mass ratio of 1:1, add salix wood fiber and biogas slurry into the mixer, stir and mix for 30 minutes at a speed of 300r / min to obtain a mixture, and then evenly spread the obtained mixture on a tray, and Move the tray into the greenhouse, and let it stand for 10 days at constant temperature and humidity under the conditions of temperature 28°C and humidity 70% to mold, then wash the moldy mixture 4 times with deionized water, and move the washed mixture into the oven , dried at a temperature of 105°C to constant weight to obtain pretreated Salix wood fibers; Under the condition of ℃, soak at a constant temperature for 12 hours, filter to obtain the filter residue, drain the water, and dry it naturally until the moisture content of the filter residue is 20%, then spray and freeze the naturally dried filter residue for 40 seconds with liquid nitrogen to obtain the frozen salix wood fiber Set up a layer of barbed wire in the middle of the reactor, and eve...