CN113524379A - Flame-retardant veneer oriented strand board and preparation method thereof - Google Patents
Flame-retardant veneer oriented strand board and preparation method thereof Download PDFInfo
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- CN113524379A CN113524379A CN202110718052.2A CN202110718052A CN113524379A CN 113524379 A CN113524379 A CN 113524379A CN 202110718052 A CN202110718052 A CN 202110718052A CN 113524379 A CN113524379 A CN 113524379A
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- 239000003063 flame retardant Substances 0.000 title claims abstract description 119
- RNFJDJUURJAICM-UHFFFAOYSA-N 2,2,4,4,6,6-hexaphenoxy-1,3,5-triaza-2$l^{5},4$l^{5},6$l^{5}-triphosphacyclohexa-1,3,5-triene Chemical compound N=1P(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP=1(OC=1C=CC=CC=1)OC1=CC=CC=C1 RNFJDJUURJAICM-UHFFFAOYSA-N 0.000 title claims abstract description 115
- 238000002360 preparation method Methods 0.000 title claims abstract description 26
- 239000002994 raw material Substances 0.000 claims abstract description 140
- 239000012792 core layer Substances 0.000 claims abstract description 92
- 239000002344 surface layer Substances 0.000 claims abstract description 91
- 238000001035 drying Methods 0.000 claims abstract description 33
- 238000007731 hot pressing Methods 0.000 claims abstract description 16
- 238000004026 adhesive bonding Methods 0.000 claims abstract description 15
- 238000005520 cutting process Methods 0.000 claims abstract description 15
- 238000012216 screening Methods 0.000 claims abstract description 14
- 238000005507 spraying Methods 0.000 claims abstract description 13
- 239000002023 wood Substances 0.000 claims description 127
- 229920001661 Chitosan Polymers 0.000 claims description 46
- 239000000463 material Substances 0.000 claims description 43
- 239000003292 glue Substances 0.000 claims description 38
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims description 32
- 238000003756 stirring Methods 0.000 claims description 28
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 claims description 24
- 239000004202 carbamide Substances 0.000 claims description 24
- 239000004005 microsphere Substances 0.000 claims description 21
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 20
- LCTONWCANYUPML-UHFFFAOYSA-N Pyruvic acid Chemical compound CC(=O)C(O)=O LCTONWCANYUPML-UHFFFAOYSA-N 0.000 claims description 20
- GZCGUPFRVQAUEE-SLPGGIOYSA-N aldehydo-D-glucose Chemical class OC[C@@H](O)[C@@H](O)[C@H](O)[C@@H](O)C=O GZCGUPFRVQAUEE-SLPGGIOYSA-N 0.000 claims description 20
- 238000000034 method Methods 0.000 claims description 18
- 238000010438 heat treatment Methods 0.000 claims description 17
- 239000004816 latex Substances 0.000 claims description 17
- 229920000126 latex Polymers 0.000 claims description 17
- 238000004519 manufacturing process Methods 0.000 claims description 16
- 239000004408 titanium dioxide Substances 0.000 claims description 16
- BZQKBFHEWDPQHD-UHFFFAOYSA-N 1,2,3,4,5-pentabromo-6-[2-(2,3,4,5,6-pentabromophenyl)ethyl]benzene Chemical compound BrC1=C(Br)C(Br)=C(Br)C(Br)=C1CCC1=C(Br)C(Br)=C(Br)C(Br)=C1Br BZQKBFHEWDPQHD-UHFFFAOYSA-N 0.000 claims description 15
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 15
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N Phenol Chemical compound OC1=CC=CC=C1 ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 claims description 12
- 239000002174 Styrene-butadiene Substances 0.000 claims description 11
- MTAZNLWOLGHBHU-UHFFFAOYSA-N butadiene-styrene rubber Chemical compound C=CC=C.C=CC1=CC=CC=C1 MTAZNLWOLGHBHU-UHFFFAOYSA-N 0.000 claims description 11
- 239000006185 dispersion Substances 0.000 claims description 11
- 238000002156 mixing Methods 0.000 claims description 11
- 230000010355 oscillation Effects 0.000 claims description 11
- 239000001254 oxidized starch Substances 0.000 claims description 11
- 235000013808 oxidized starch Nutrition 0.000 claims description 11
- 239000011115 styrene butadiene Substances 0.000 claims description 11
- 229920003048 styrene butadiene rubber Polymers 0.000 claims description 11
- WNROFYMDJYEPJX-UHFFFAOYSA-K aluminium hydroxide Chemical compound [OH-].[OH-].[OH-].[Al+3] WNROFYMDJYEPJX-UHFFFAOYSA-K 0.000 claims description 10
- 239000000440 bentonite Substances 0.000 claims description 10
- 229910000278 bentonite Inorganic materials 0.000 claims description 10
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 claims description 10
- FOCAUTSVDIKZOP-UHFFFAOYSA-N chloroacetic acid Chemical compound OC(=O)CCl FOCAUTSVDIKZOP-UHFFFAOYSA-N 0.000 claims description 10
- 229940106681 chloroacetic acid Drugs 0.000 claims description 10
- 238000001816 cooling Methods 0.000 claims description 10
- ZLNQQNXFFQJAID-UHFFFAOYSA-L magnesium carbonate Chemical compound [Mg+2].[O-]C([O-])=O ZLNQQNXFFQJAID-UHFFFAOYSA-L 0.000 claims description 10
- 239000002245 particle Substances 0.000 claims description 10
- 229940107700 pyruvic acid Drugs 0.000 claims description 10
- 235000019832 sodium triphosphate Nutrition 0.000 claims description 10
- 238000006243 chemical reaction Methods 0.000 claims description 8
- 238000004513 sizing Methods 0.000 claims description 8
- 238000004321 preservation Methods 0.000 claims description 7
- 239000000853 adhesive Substances 0.000 claims description 6
- 230000001070 adhesive effect Effects 0.000 claims description 6
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 5
- 238000001914 filtration Methods 0.000 claims description 5
- 239000003546 flue gas Substances 0.000 claims description 5
- 238000001132 ultrasonic dispersion Methods 0.000 claims description 5
- 239000007921 spray Substances 0.000 claims 1
- 238000005452 bending Methods 0.000 abstract description 12
- 239000000779 smoke Substances 0.000 abstract description 10
- 230000003068 static effect Effects 0.000 abstract description 9
- 238000002485 combustion reaction Methods 0.000 abstract description 7
- 230000001988 toxicity Effects 0.000 abstract description 5
- 231100000419 toxicity Toxicity 0.000 abstract description 5
- 239000004566 building material Substances 0.000 abstract description 4
- 238000012360 testing method Methods 0.000 abstract description 4
- 239000010410 layer Substances 0.000 description 32
- 239000002699 waste material Substances 0.000 description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 12
- 235000021190 leftovers Nutrition 0.000 description 8
- FDYSSWYQRTVFIS-UHFFFAOYSA-N buta-1,3-diene 3-phenylprop-2-enoic acid Chemical group C=CC=C.C(=O)(O)C=CC1=CC=CC=C1 FDYSSWYQRTVFIS-UHFFFAOYSA-N 0.000 description 5
- 230000000052 comparative effect Effects 0.000 description 5
- 239000000835 fiber Substances 0.000 description 5
- 230000032683 aging Effects 0.000 description 4
- 239000003795 chemical substances by application Substances 0.000 description 4
- -1 gravels Substances 0.000 description 4
- 239000012535 impurity Substances 0.000 description 4
- 230000007774 longterm Effects 0.000 description 4
- 229910052751 metal Inorganic materials 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- 238000004806 packaging method and process Methods 0.000 description 4
- 239000004033 plastic Substances 0.000 description 4
- 229920003023 plastic Polymers 0.000 description 4
- 239000011120 plywood Substances 0.000 description 4
- 239000000843 powder Substances 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- 229920001807 Urea-formaldehyde Polymers 0.000 description 3
- ADCOVFLJGNWWNZ-UHFFFAOYSA-N antimony trioxide Chemical compound O=[Sb]O[Sb]=O ADCOVFLJGNWWNZ-UHFFFAOYSA-N 0.000 description 2
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- SMNNDVUKAKPGDD-UHFFFAOYSA-N 2-butylbenzoic acid Chemical compound CCCCC1=CC=CC=C1C(O)=O SMNNDVUKAKPGDD-UHFFFAOYSA-N 0.000 description 1
- 239000012752 auxiliary agent Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- IUTYMBRQELGIRS-UHFFFAOYSA-N boric acid;1,3,5-triazine-2,4,6-triamine Chemical compound OB(O)O.NC1=NC(N)=NC(N)=N1 IUTYMBRQELGIRS-UHFFFAOYSA-N 0.000 description 1
- LNEUSAPFBRDCPM-UHFFFAOYSA-N carbamimidoylazanium;sulfamate Chemical compound NC(N)=N.NS(O)(=O)=O LNEUSAPFBRDCPM-UHFFFAOYSA-N 0.000 description 1
- 238000004132 cross linking Methods 0.000 description 1
- 238000005034 decoration Methods 0.000 description 1
- GUJOJGAPFQRJSV-UHFFFAOYSA-N dialuminum;dioxosilane;oxygen(2-);hydrate Chemical compound O.[O-2].[O-2].[O-2].[Al+3].[Al+3].O=[Si]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O GUJOJGAPFQRJSV-UHFFFAOYSA-N 0.000 description 1
- 238000005886 esterification reaction Methods 0.000 description 1
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 1
- 230000002045 lasting effect Effects 0.000 description 1
- VTHJTEIRLNZDEV-UHFFFAOYSA-L magnesium dihydroxide Chemical compound [OH-].[OH-].[Mg+2] VTHJTEIRLNZDEV-UHFFFAOYSA-L 0.000 description 1
- 239000000347 magnesium hydroxide Substances 0.000 description 1
- 229910001862 magnesium hydroxide Inorganic materials 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 229910052901 montmorillonite Inorganic materials 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000035882 stress Effects 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- DQWPFSLDHJDLRL-UHFFFAOYSA-N triethyl phosphate Chemical compound CCOP(=O)(OCC)OCC DQWPFSLDHJDLRL-UHFFFAOYSA-N 0.000 description 1
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
- B27N3/08—Moulding or pressing
- B27N3/10—Moulding of mats
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27M—WORKING OF WOOD NOT PROVIDED FOR IN SUBCLASSES B27B - B27L; MANUFACTURE OF SPECIFIC WOODEN ARTICLES
- B27M1/00—Working of wood not provided for in subclasses B27B - B27L, e.g. by stretching
- B27M1/08—Working of wood not provided for in subclasses B27B - B27L, e.g. by stretching by multi-step processes
-
- 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
- B27N3/08—Moulding or pressing
- B27N3/10—Moulding of mats
- B27N3/14—Distributing or orienting the particles or fibres
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Wood Science & Technology (AREA)
- Forests & Forestry (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Dry Formation Of Fiberboard And The Like (AREA)
- Chemical And Physical Treatments For Wood And The Like (AREA)
Abstract
The preparation method of the flame-retardant veneer-faced oriented strand board comprises the steps of preparing a core layer raw material, preparing a surface layer raw material, spraying a flame retardant, drying the raw material, screening the raw material, gluing, paving, sawing, cutting, hot-pressing and post-treating. The internal bonding strength of the flame-retardant veneer oriented strand board is 0.72-0.85MPa, the parallel static bending strength is 45.4-47.1MPa, and the vertical static bending strength is 31.2-33.5 MPa; the combustibility reaches grade B1 specified in GB8624-2012 'building material and product combustion performance grading', the smoke-producing characteristic reaches grade s1, and the smoke toxicity reaches grade t 1; after 3 months of friction test, the combustibility reaches grade B1 specified in GB8624-2012 'building material and product combustion performance grading', the smoke-producing characteristic reaches grade s1, and the smoke toxicity reaches grade t 1.
Description
Technical Field
The invention relates to a flame-retardant veneer-faced oriented strand board and a preparation method thereof, belonging to the technical field of artificial boards.
Background
The oriented strand board is a multilayer structure board prepared by gluing wood shavings with specified properties and thickness, then directionally paving the wood shavings, and performing hot pressing on the wood shavings, wherein the wood shavings on the surface layer are directionally arranged along the length or width direction of the board; the oriented shaving board capable of being decorated is an oriented shaving board which can be directly decorated and processed, wherein the raw material of the surface layer is fine wood shavings, fine fibers and the like.
The surface layer shaving pieces of the veneerable oriented strand board are longitudinally arranged, the core layer shaving pieces are transversely arranged, the wood texture structure is recombined due to the criss-cross arrangement, the influence of wood internal stress on processing is thoroughly eliminated, the veneerable oriented strand board has excellent processability and moisture resistance, the interior of the veneerable oriented strand board is of an oriented structure, no joint, no gap and no crack exist, the integral uniformity is good, the internal bonding strength is extremely high, and therefore the veneerable oriented strand board is widely developed in recent years.
However, when the veneered oriented strand board is applied to indoor occasions such as interior decoration and furniture manufacturing, if a fire disaster occurs, the hidden danger of the fire disaster is accelerated and enlarged by the wood material, so the wood material which is not subjected to flame retardant treatment is classified as a combustible wood material, and therefore, the fireproof flame retardant treatment of the veneered oriented strand board is very important.
When the flame-retardant veneerable oriented strand board is prepared in the prior art, the flame retardant is easy to lose in the long-term use process, and meanwhile, the compatibility of the flame retardant and an adhesive is poor, so that the prepared flame-retardant veneerable oriented strand board has the following defects:
(1) the loss of the flame retardant is large in the long-term use process, and the combustion performance is reduced quickly;
(2) if the content of the flame retardant is increased, the internal bonding strength and the static bending strength of the oriented strand board are reduced;
(3) the flame-retardant wood shaving board has low bending elastic modulus, internal bonding strength, surface bonding strength and the like.
Therefore, the problem that the flame retardant faced oriented strand board which is good in flame retardant effect, difficult in loss of the flame retardant in the flame retardant faced oriented strand board and high in internal bonding strength and static bending strength is needed to be solved urgently at present is prepared.
Patent CN112829037A discloses a preparation method of flame-retardant shaving board and the flame-retardant shaving board, comprising: uniformly mixing and paving the core layer dry wood shavings, the core layer flame retardant and the core layer adhesive, wherein the core layer flame retardant is prepared from magnesium hydroxide, montmorillonite and guanidine sulfamate in a mass ratio of 100: (0-3.5): (0-1.5), wherein the mass ratio of the core layer flame retardant to the core layer dry wood shavings is 3-5%, and the mass ratio of the core layer adhesive to the core layer dry wood shavings is 8-12%; uniformly mixing and paving the surface layer dry wood shavings, the surface layer flame retardant and the surface layer adhesive, wherein the surface layer flame retardant is prepared from melamine borate, antimony trioxide and triethyl phosphate according to the mass ratio of 100: (5-10): (3-6), the mass ratio of the surface layer flame retardant to the surface layer dry wood shavings is 7-15%, and the glue application amount of the surface layer adhesive to the surface layer dry wood shavings is 8-10%, but the flame retardant is added into the core layer and the surface layer, so that the internal bonding strength and the static bending strength of the surface layer of the flame-retardant shaving board are influenced.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a flame-retardant veneer oriented strand board and a preparation method thereof, and the following purposes are realized:
(1) the loss of the flame retardant in the long-term use process of the flame-retardant shaving board is reduced;
(2) the flame retardance of the flame-retardant veneered oriented strand board is improved, and meanwhile, the influence on the internal bonding strength and static bending strength of the oriented strand board is reduced;
(3) the indexes of the flame-retardant wood shaving board such as bending elastic modulus, internal bonding strength, surface bonding strength and the like are improved.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
a preparation method of a flame-retardant veneer oriented strand board comprises the steps of preparing a core layer raw material, preparing a surface layer raw material, spraying a flame retardant, drying the raw material, screening the raw material, gluing, paving, sawing, cutting, hot-pressing and post-treating.
The method comprises the steps of preparing a core layer raw material, carrying out primary airing, ventilating and natural drying on rotary-cut veneer leftovers left in the production process of the plywood until the water content is 15% -30%, and then slicing the rotary-cut veneer leftovers by a re-crusher and a flaker to prepare the core layer shaving raw material with the length of 40-140mm, the width of 5-20mm and the thickness of 0.20-0.60 mm.
The surface layer raw material is prepared by collecting sawdust, wood shavings, waste fibers, sanding powder and other waste materials generated in the production process of the artificial board, primarily airing, ventilating and naturally drying until the water content is 15-30%, and slicing the waste materials by a re-crusher and a flaker to prepare the surface layer wood shavings raw material with the length of 40-140mm, the width of 5-20mm and the thickness of 0.20-0.60 mm.
And the flame retardant is uniformly sprayed on the surface layer wood shaving raw material and the core layer wood shaving raw material respectively by spraying the flame retardant, so that the core layer wood shaving raw material and the surface layer wood shaving raw material with the flame retardant are obtained.
Wherein the mass ratio of the surface layer wood shaving raw material to the flame retardant is 100:2-3, and the mass ratio of the core layer wood shaving raw material to the flame retardant is 100: 4-5.
The flame retardant comprises, by weight, 20-23 parts of carboxylated chitosan microspheres, 7-9 parts of anhydrous magnesium carbonate, 2-3 parts of powdered decabromodiphenylethane, 8-10 parts of nano-scale titanium dioxide, 5-7 parts of oxidized starch, 1-2 parts of bentonite, 4-5 parts of aluminum hydroxide and 100-110 parts of anhydrous ethanol.
The particle size of the powdery decabromodiphenylethane is 6-10 mu m.
The particle size of the nano-scale titanium dioxide is 80-150 nm.
The preparation method of the flame retardant comprises the steps of adding carboxylated chitosan microspheres, anhydrous magnesium carbonate, powdered decabromodiphenylethane and nano-scale titanium dioxide into anhydrous ethanol, then carrying out ultrasonic oscillation dispersion for 20-25min at the ultrasonic oscillation dispersion power of 600-700W and the ultrasonic dispersion temperature of 20-30 ℃, then adding oxidized starch, bentonite, aluminum hydroxide and anhydrous ethanol, stirring at 40-45 ℃ and a stirring speed of 100-120rpm for 40-50min, and then carrying out low-temperature reduced pressure concentration under a vacuum condition until the relative density is 1.25-1.35 to obtain the flame retardant, wherein the low-temperature reduced pressure concentration temperature is 70-85 ℃, and the vacuum degree is-0.07 MPa to-0.05 MPa.
The carboxylated chitosan microspheres are prepared by dissolving chitosan in 10-12% hydrochloric acid solution by mass, then adding chloroacetic acid and pyruvic acid, and stirring at the temperature of 30-35 ℃ and the stirring speed of 120-150rpm for 35-40min to obtain a carboxylated chitosan solution; and then adding sodium tripolyphosphate into the chitosan solution, stirring at the stirring speed of 80-90rpm at 50-55 ℃ for 1.5-2h, filtering, and drying filter residues at 80-85 ℃ to obtain the carboxylated chitosan microspheres.
Wherein, the weight ratio of chitosan: 10-12% by mass of hydrochloric acid solution: chloroacetic acid: pyruvic acid: the mass ratio of the sodium tripolyphosphate is 20-22:60-70:5-6:8-10: 13-15.
Drying the raw materials, namely pneumatically conveying the core layer wood shaving raw materials and the surface layer wood shaving raw materials with the flame retardant to a single-channel roller type drying machine through a fan respectively, and drying the core layer wood shaving raw materials and the surface layer wood shaving raw materials by using mixed flue gas at 400-plus-500 ℃ to obtain the dried core layer wood shaving raw materials and the dried surface layer wood shaving raw materials, wherein the drying time is 5-8s, and the water content of the dried materials is 2-4%.
And in the raw material screening, impurities such as metal substances, gravels, plastics and the like contained in the dried core layer wood shaving raw material and the dried surface layer wood shaving raw material are respectively removed through mechanical screening, so that the screened core layer wood shaving raw material and the screened surface layer wood shaving raw material are obtained.
And gluing, namely gluing the screened core layer wood shaving raw material and the screened surface layer wood shaving raw material respectively by adopting mechanical glue mixing to obtain the glued core layer raw material and surface layer raw material.
Wherein, the surface layer glue application amount is 2-3%, the glue application amount is based on the mass ratio of the absolute glue to the absolute dry wood shavings, the core layer glue application amount is 2-2.5%, and the application amount is based on the mass ratio of the absolute glue to the absolute dry wood shavings.
The sizing agent is carboxyl styrene-butadiene latex modified urea-formaldehyde resin.
The preparation method of the modified urea-formaldehyde resin comprises the steps of uniformly mixing carboxylic styrene-butadiene latex and phenol, adjusting the pH value to 5-6, heating to 70-80 ℃, preserving heat for 30-40min, adding a first batch of urea, heating to 75-80 ℃, preserving heat and reacting for 25-30 min; then adjusting the pH value to 8-9, cooling to 20-25 ℃, adding a second batch of urea, heating to 90-100 ℃, and then carrying out heat preservation reaction for 35-40min to obtain the modified urea-formaldehyde resin.
Wherein, the carboxylic styrene-butadiene latex: phenol: first batch of urea: the mass ratio of the second batch of urea is 30-40:13-15:7-9: 11-15.
Paving, paving the core layer raw materials after glue application through five paving heads respectively to obtain a core layer material, and paving the surface layer material after glue application on the upper surface and the lower surface of the core layer material to obtain a plate blank.
The sandwich layer material is divided into a three-layer structure which comprises a middle sandwich layer, an upper sandwich layer and a lower sandwich layer from top to bottom in sequence, wherein the middle sandwich layer is paved transversely, and the upper sandwich layer and the lower sandwich layer are paved longitudinally.
The surface layer material is laid with the wood shavings arranged longitudinally.
The core layer material accounts for 70-80% of the total mass of the oriented strand board, and the surface layer material accounts for 20-30% of the total mass of the oriented strand board.
And sawing, namely compacting the plate blank through a prepress, and sawing the plate blank into the required plate blank width through the plate blank cutting edge to obtain the sawn plate blank.
And hot pressing, namely placing the sawn plate blank in a hot press, and hot pressing for 15-17min at the temperature of 135-.
And (3) performing post-treatment, namely performing cross cutting on the hot-pressed finished board, cooling a turning plate, aging and storing, cutting the board according to specifications, inspecting, classifying, packaging and warehousing to obtain the flame-retardant veneer oriented strand board.
Compared with the prior art, the invention has the beneficial effects that:
(1) the flame-retardant veneerable oriented strand board prepared by the invention can greatly reduce the influence of a flame retardant on the internal bonding strength and the static bending strength, and the flame-retardant veneerable oriented strand board has the internal bonding strength of 0.72-0.85MPa, the parallel static bending strength of 45.4-47.1MPa and the vertical static bending strength of 31.2-33.5 MPa;
(2) the flame-retardant veneerable oriented strand board prepared by the invention has the advantages that the combustion performance reaches B1 level specified in GB8624-2012 'combustion performance grading of building materials and products', the smoke production characteristic reaches s1 level, and the smoke toxicity reaches t1 level;
(3) according to the preparation method of the flame-retardant veneer oriented strand board, the chitosan is partially carboxylated, the carboxylated chitosan can absorb the flame retardant and the auxiliary agent, and the carboxyl of the carboxylated chitosan and the hydroxyl on the surface of the wood are subjected to esterification reaction in the drying process, so that the loss of the flame retardant is reduced; the carboxyl styrene-butadiene latex modified urea-formaldehyde resin is provided with carboxyl and has good compatibility with carboxylated chitosan, and a crosslinking reaction is carried out in a hot pressing process, so that the bonding strength is improved, the loss of a flame retardant in the long-term use process of the flame-retardant shaving board is further reduced, after 3 months of friction test, the combustibility still reaches the B1 level specified in GB8624-2012 'building material and product combustion performance grade', the smoke production characteristic reaches the s1 level, and the smoke toxicity reaches the t1 level;
(4) the flame-retardant veneer oriented strand board prepared by the invention has the parallel bending elastic modulus of 4895-.
Detailed Description
In order to more clearly understand the technical features, objects, and effects of the present invention, specific embodiments of the present invention will now be described.
Example 1
A preparation method of a flame-retardant veneer oriented strand board sequentially comprises the steps of preparing a core layer raw material, preparing a surface layer raw material, spraying a flame retardant, drying the raw material, screening the raw material, gluing, paving, sawing, hot-pressing and post-treating.
Preparing a core layer raw material, namely primarily airing, ventilating and naturally drying the rotary-cut veneer leftovers left in the production process of the plywood until the water content is 15%, and then slicing the rotary-cut veneer leftovers by a re-crusher and a flaker to prepare the core layer shaving raw material with the length of 40mm, the width of 5mm and the thickness of 0.20 mm.
The surface layer raw material is prepared by collecting sawdust, wood shavings, waste fibers, sanding powder and other waste materials generated in the production process of the artificial board, preliminarily airing, ventilating and naturally drying until the water content is 15%, and slicing the waste materials by a re-crusher and a flaker to prepare the surface layer wood shavings raw material with the length of 40mm, the width of 5mm and the thickness of 0.20 mm.
And the flame retardant is uniformly sprayed on the surface layer wood shaving raw material and the core layer wood shaving raw material respectively by spraying the flame retardant, so that the core layer wood shaving raw material and the surface layer wood shaving raw material with the flame retardant are obtained.
Wherein the mass ratio of the surface layer wood shaving raw material to the flame retardant is 100:2, and the mass ratio of the core layer wood shaving raw material to the flame retardant is 100: 4.
The flame retardant comprises, by weight, 20 parts of carboxylated chitosan microspheres, 7 parts of anhydrous magnesium carbonate, 2 parts of powdered decabromodiphenylethane, 8 parts of nano-scale titanium dioxide, 5 parts of oxidized starch, 1 part of bentonite, 4 parts of aluminum hydroxide and 100 parts of anhydrous ethanol.
The particle size of the powdery decabromodiphenylethane is 6 mu m.
The particle size of the nano-scale titanium dioxide is 80 nm.
The preparation method of the flame retardant comprises the steps of adding the carboxylated chitosan microspheres, anhydrous magnesium carbonate, powdered decabromodiphenylethane and nano-scale titanium dioxide into anhydrous ethanol, then carrying out ultrasonic oscillation dispersion for 20min at the ultrasonic oscillation dispersion power of 600W at the ultrasonic dispersion temperature of 20 ℃, then adding oxidized starch, bentonite, aluminum hydroxide and anhydrous ethanol, stirring at 40 ℃ at a stirring speed of 100rpm for 40min, and then carrying out low-temperature reduced pressure concentration under a vacuum condition until the relative density is 1.25 to obtain the flame retardant, wherein the temperature of the low-temperature reduced pressure concentration is 70 ℃ and the vacuum degree is-0.07 MPa.
The carboxylated chitosan microspheres are prepared by dissolving chitosan in 10% hydrochloric acid solution by mass, then adding chloroacetic acid and pyruvic acid, and stirring at 30 ℃ and 120rpm for 35min to obtain a carboxylated chitosan solution; and then adding sodium tripolyphosphate into the chitosan solution, stirring at 50 ℃ and a stirring speed of 80rpm for 1.5h, filtering, and drying filter residues at 80 ℃ to obtain the carboxylated chitosan microspheres.
Wherein, the weight ratio of chitosan: 10% by mass of hydrochloric acid solution: chloroacetic acid: pyruvic acid: the mass ratio of the sodium tripolyphosphate is 20:60:5:8: 13.
The method comprises the following steps of drying raw materials, namely conveying a core layer wood shaving raw material and a surface layer wood shaving raw material with a flame retardant to a single-channel roller type dryer through a fan respectively, drying the core layer wood shaving raw material and the surface layer wood shaving raw material by using mixed flue gas at 400 ℃, obtaining the dried core layer wood shaving raw material and the dried surface layer wood shaving raw material, wherein the drying time is 5s, and the water content of the dried materials is 2%.
And in the raw material screening, impurities such as metal substances, gravels, plastics and the like contained in the dried core layer wood shaving raw material and the dried surface layer wood shaving raw material are respectively removed through mechanical screening, so that the screened core layer wood shaving raw material and the screened surface layer wood shaving raw material are obtained.
And gluing, namely gluing the screened core layer wood shaving raw material and the screened surface layer wood shaving raw material respectively by adopting mechanical glue mixing to obtain the glued core layer raw material and surface layer raw material.
Wherein, the surface layer glue application amount is 2 percent, the glue application amount is based on the mass ratio of the absolute glue to the absolute dry wood shavings, the core layer glue application amount is 2 percent, and the application amount is based on the mass ratio of the absolute glue to the absolute dry wood shavings.
The sizing agent is carboxyl styrene-butadiene latex modified urea-formaldehyde resin.
The preparation method of the modified urea-formaldehyde resin comprises the steps of uniformly mixing carboxylic styrene-butadiene latex and phenol, adjusting the pH value to 5, heating to 70 ℃, keeping the temperature for 30min, adding a first batch of urea, heating to 75 ℃, keeping the temperature and reacting for 25 min; and then adjusting the pH value to 8, cooling to 20 ℃, adding a second batch of urea, heating to 90 ℃, and then carrying out heat preservation reaction for 35min to obtain the modified urea-formaldehyde resin.
Wherein, the carboxylic styrene-butadiene latex: phenol: first batch of urea: the mass ratio of the second batch of urea is 30:13:7: 11.
Paving, paving the core layer raw materials after glue application through five paving heads respectively to obtain a core layer material, and paving the surface layer material after glue application on the upper surface and the lower surface of the core layer material to obtain a plate blank.
The sandwich layer material is divided into a three-layer structure which comprises a middle sandwich layer, an upper sandwich layer and a lower sandwich layer from top to bottom in sequence, wherein the middle sandwich layer is paved transversely, and the upper sandwich layer and the lower sandwich layer are paved longitudinally.
The surface layer material is laid with the wood shavings arranged longitudinally.
The core layer material accounts for 70% of the total mass of the oriented strand board, and the surface layer material accounts for 30% of the total mass of the oriented strand board.
And sawing, namely compacting the plate blank through a prepress, and sawing the plate blank into the required plate blank width through the plate blank cutting edge to obtain the sawn plate blank.
And (3) hot pressing, namely placing the sawn plate blank in a hot press, and hot pressing for 15min at the temperature of 135 ℃ and the pressure of 3.5Mpa to obtain a hot-pressed finished plate.
And (3) performing post-treatment, namely performing cross cutting on the hot-pressed finished board, cooling a turning plate, aging and storing, cutting the board according to specifications, inspecting, classifying, packaging and warehousing to obtain the flame-retardant veneer oriented strand board.
Example 2
A preparation method of a flame-retardant veneer oriented strand board sequentially comprises the steps of preparing a core layer raw material, preparing a surface layer raw material, spraying a flame retardant, drying the raw material, screening the raw material, gluing, paving, sawing, hot-pressing and post-treating.
The method comprises the steps of preparing a core layer raw material, carrying out primary airing, ventilating and natural drying on the rotary-cut veneer leftovers left in the production process of the plywood until the water content is 20%, and then slicing the rotary-cut veneer leftovers by a re-crusher and a flaker to prepare the core layer shaving raw material with the length of 70mm, the width of 10mm and the thickness of 0.40 mm.
The surface layer raw material is prepared by collecting sawdust, wood shavings, waste fibers, sanding powder and other waste materials generated in the production process of the artificial board, preliminarily airing, ventilating and naturally drying until the water content is 20%, and slicing the waste materials by a re-crusher and a flaker to prepare the surface layer wood shavings raw material with the length of 70mm, the width of 10mm and the thickness of 0.40 mm.
And the flame retardant is uniformly sprayed on the surface layer wood shaving raw material and the core layer wood shaving raw material respectively by spraying the flame retardant, so that the core layer wood shaving raw material and the surface layer wood shaving raw material with the flame retardant are obtained.
Wherein the mass ratio of the surface layer wood shaving raw material to the flame retardant is 100:3, and the mass ratio of the core layer wood shaving raw material to the flame retardant is 100: 4.
The flame retardant comprises, by weight, 22 parts of carboxylated chitosan microspheres, 8 parts of anhydrous magnesium carbonate, 2 parts of powdered decabromodiphenylethane, 9 parts of nano-scale titanium dioxide, 6 parts of oxidized starch, 1 part of bentonite, 4 parts of aluminum hydroxide and 105 parts of anhydrous ethanol.
The particle size of the powdery decabromodiphenylethane is 8 mu m.
The particle size of the nano-scale titanium dioxide is 100 nm.
The preparation method of the flame retardant comprises the steps of adding the carboxylated chitosan microspheres, anhydrous magnesium carbonate, powdered decabromodiphenylethane and nano-scale titanium dioxide into anhydrous ethanol, then carrying out ultrasonic oscillation dispersion for 22min, wherein the ultrasonic oscillation dispersion power is 650W, the ultrasonic dispersion temperature is 25 ℃, then adding oxidized starch, bentonite, aluminum hydroxide and anhydrous ethanol, stirring for 45min at a stirring speed of 110rpm at 42 ℃, and then carrying out low-temperature reduced pressure concentration under a vacuum condition until the relative density is 1.3 to obtain the flame retardant, wherein the low-temperature reduced pressure concentration temperature is 80 ℃ and the vacuum degree is-0.06 MPa.
The carboxylated chitosan microspheres are prepared by dissolving chitosan in a hydrochloric acid solution with the mass fraction of 11%, then adding chloroacetic acid and pyruvic acid, and stirring at the temperature of 32 ℃ and the stirring speed of 130rpm for 37min to obtain a carboxylated chitosan solution; and then adding sodium tripolyphosphate into the chitosan solution, stirring at the stirring speed of 85rpm at 52 ℃ for 1.8h, filtering, and drying filter residues at 82 ℃ to obtain the carboxylated chitosan microspheres.
Wherein, the weight ratio of chitosan: 10-12% by mass of hydrochloric acid solution: chloroacetic acid: pyruvic acid: the mass ratio of the sodium tripolyphosphate is 21:65:5:9: 14.
The method comprises the following steps of drying raw materials, namely conveying a core layer wood shaving raw material and a surface layer wood shaving raw material with a flame retardant to a single-channel roller type dryer through a fan respectively, drying the core layer wood shaving raw material and the surface layer wood shaving raw material by using mixed flue gas at 450 ℃ to obtain the dried core layer wood shaving raw material and the dried surface layer wood shaving raw material, wherein the drying time is 6s, and the water content of the dried materials is 3%.
And in the raw material screening, impurities such as metal substances, gravels, plastics and the like contained in the dried core layer wood shaving raw material and the dried surface layer wood shaving raw material are respectively removed through mechanical screening, so that the screened core layer wood shaving raw material and the screened surface layer wood shaving raw material are obtained.
And gluing, namely gluing the screened core layer wood shaving raw material and the screened surface layer wood shaving raw material respectively by adopting mechanical glue mixing to obtain the glued core layer raw material and surface layer raw material.
Wherein, the surface layer glue application amount is 2.5 percent, the glue application amount is based on the mass ratio of the absolute glue to the absolute dry wood shavings, the core layer glue application amount is 2 percent, and the application amount is based on the mass ratio of the absolute glue to the absolute dry wood shavings.
The sizing agent is carboxyl styrene-butadiene latex modified urea-formaldehyde resin.
The preparation method of the modified urea-formaldehyde resin comprises the steps of uniformly mixing carboxylic styrene-butadiene latex and phenol, adjusting the pH value to 5, heating to 75 ℃, keeping the temperature for 35min, adding a first batch of urea, heating to 78 ℃, keeping the temperature and reacting for 28 min; and then adjusting the pH value to 8, cooling to 22 ℃, adding a second batch of urea, heating to 95 ℃, and then carrying out heat preservation reaction for 38min to obtain the modified urea-formaldehyde resin.
Wherein, the carboxylic styrene-butadiene latex: phenol: first batch of urea: the mass ratio of the second batch of urea is 35:14:8: 13.
Paving, paving the core layer raw materials after glue application through five paving heads respectively to obtain a core layer material, and paving the surface layer material after glue application on the upper surface and the lower surface of the core layer material to obtain a plate blank.
The sandwich layer material is divided into a three-layer structure which comprises a middle sandwich layer, an upper sandwich layer and a lower sandwich layer from top to bottom in sequence, wherein the middle sandwich layer is paved transversely, and the upper sandwich layer and the lower sandwich layer are paved longitudinally.
The surface layer material is laid with the wood shavings arranged longitudinally.
The core layer material accounts for 80% of the total mass of the oriented strand board, and the surface layer material accounts for 20% of the total mass of the oriented strand board.
And sawing, namely compacting the plate blank through a prepress, and sawing the plate blank into the required plate blank width through the plate blank cutting edge to obtain the sawn plate blank.
And (3) hot pressing, namely placing the sawn plate blank in a hot press, and hot pressing for 16min at the temperature of 138 ℃ and the pressure of 4Mpa to obtain a hot-pressed finished plate.
And (3) performing post-treatment, namely performing cross cutting on the hot-pressed finished board, cooling a turning plate, aging and storing, cutting the board according to specifications, inspecting, classifying, packaging and warehousing to obtain the flame-retardant veneer oriented strand board.
Example 3
A preparation method of a flame-retardant veneer oriented strand board sequentially comprises the steps of preparing a core layer raw material, preparing a surface layer raw material, spraying a flame retardant, drying the raw material, screening the raw material, gluing, paving, sawing, hot-pressing and post-treating.
The method comprises the steps of preparing a core layer raw material, carrying out primary airing, ventilating and natural drying on the rotary-cut veneer leftovers left in the production process of the plywood until the water content is 30%, and then slicing the rotary-cut veneer leftovers by a re-crusher and a flaker to prepare the core layer shaving raw material with the length of 140mm, the width of 20mm and the thickness of 0.60 mm.
The surface layer raw material is prepared by collecting sawdust, wood shavings, waste fibers, sanding powder and other waste materials generated in the production process of the artificial board, preliminarily airing, ventilating and naturally drying until the water content is 30%, and slicing the waste materials by a re-crusher and a flaker to prepare the surface layer wood shavings raw material with the length of 140mm, the width of 20mm and the thickness of 0.60 mm.
And the flame retardant is uniformly sprayed on the surface layer wood shaving raw material and the core layer wood shaving raw material respectively by spraying the flame retardant, so that the core layer wood shaving raw material and the surface layer wood shaving raw material with the flame retardant are obtained.
Wherein the mass ratio of the surface layer wood shaving raw material to the flame retardant is 100:3, and the mass ratio of the core layer wood shaving raw material to the flame retardant is 100: 5.
The flame retardant comprises, by weight, 23 parts of carboxylated chitosan microspheres, 9 parts of anhydrous magnesium carbonate, 3 parts of powdered decabromodiphenylethane, 10 parts of nano-scale titanium dioxide, 7 parts of oxidized starch, 2 parts of bentonite, 5 parts of aluminum hydroxide and 110 parts of anhydrous ethanol.
The particle size of the powdery decabromodiphenylethane is 10 mu m.
The particle size of the nano-scale titanium dioxide is 150 nm.
The preparation method of the flame retardant comprises the steps of adding the carboxylated chitosan microspheres, anhydrous magnesium carbonate, powdered decabromodiphenylethane and nano-scale titanium dioxide into anhydrous ethanol, then carrying out ultrasonic oscillation dispersion for 25min at the ultrasonic oscillation dispersion power of 700W at the ultrasonic dispersion temperature of 30 ℃, then adding oxidized starch, bentonite, aluminum hydroxide and anhydrous ethanol, stirring at 45 ℃ and a stirring speed of 120rpm for 50min, and then carrying out low-temperature reduced pressure concentration under a vacuum condition until the relative density is 1.35 to obtain the flame retardant, wherein the temperature of the low-temperature reduced pressure concentration is 85 ℃ and the vacuum degree is-0.05 MPa.
The carboxylated chitosan microspheres are prepared by dissolving chitosan in a hydrochloric acid solution with the mass fraction of 12%, then adding chloroacetic acid and pyruvic acid, and stirring at the stirring speed of 150rpm at 35 ℃ for 40min to obtain a carboxylated chitosan solution; and then adding sodium tripolyphosphate into the chitosan solution, stirring at the stirring speed of 90rpm at 55 ℃ for 2h, filtering, and drying filter residues at 85 ℃ to obtain the carboxylated chitosan microspheres.
Wherein, the weight ratio of chitosan: 12% by mass of hydrochloric acid solution: chloroacetic acid: pyruvic acid: the mass ratio of the sodium tripolyphosphate is 22:70:6:10: 15.
The method comprises the steps of drying raw materials, namely conveying a core layer wood shaving raw material and a surface layer wood shaving raw material with a flame retardant to a single-channel roller type dryer through a fan respectively, drying the core layer wood shaving raw material and the surface layer wood shaving raw material by using 500-DEG C mixed flue gas, and obtaining the dried core layer wood shaving raw material and the dried surface layer wood shaving raw material, wherein the drying time is 8s, and the water content of the dried materials is 4%.
And in the raw material screening, impurities such as metal substances, gravels, plastics and the like contained in the dried core layer wood shaving raw material and the dried surface layer wood shaving raw material are respectively removed through mechanical screening, so that the screened core layer wood shaving raw material and the screened surface layer wood shaving raw material are obtained.
And gluing, namely gluing the screened core layer wood shaving raw material and the screened surface layer wood shaving raw material respectively by adopting mechanical glue mixing to obtain the glued core layer raw material and surface layer raw material.
Wherein, the surface layer glue application amount is 3 percent, the glue application amount is based on the mass ratio of the absolute glue to the absolute dry wood shavings, the core layer glue application amount is 2.5 percent, and the application amount is based on the mass ratio of the absolute glue to the absolute dry wood shavings.
The sizing agent is carboxyl styrene-butadiene latex modified urea-formaldehyde resin.
The preparation method of the modified urea-formaldehyde resin comprises the steps of uniformly mixing carboxylic styrene-butadiene latex and phenol, adjusting the pH value to 6, heating to 80 ℃, keeping the temperature for 40min, adding a first batch of urea, heating to 80 ℃, keeping the temperature and reacting for 30 min; and then adjusting the pH value to 9, cooling to 25 ℃, adding a second batch of urea, heating to 100 ℃, and then carrying out heat preservation reaction for 40min to obtain the modified urea-formaldehyde resin.
Wherein, the carboxylic styrene-butadiene latex: phenol: first batch of urea: the mass ratio of the second batch of urea is 40:15:9: 15.
Paving, paving the core layer raw materials after glue application through five paving heads respectively to obtain a core layer material, and paving the surface layer material after glue application on the upper surface and the lower surface of the core layer material to obtain a plate blank.
The sandwich layer material is divided into a three-layer structure which comprises a middle sandwich layer, an upper sandwich layer and a lower sandwich layer from top to bottom in sequence, wherein the middle sandwich layer is paved transversely, and the upper sandwich layer and the lower sandwich layer are paved longitudinally.
The surface layer material is laid with the wood shavings arranged longitudinally.
The core layer material accounts for 75% of the total mass of the oriented strand board, and the surface layer material accounts for 25% of the total mass of the oriented strand board.
And sawing, namely compacting the plate blank through a prepress, and sawing the plate blank into the required plate blank width through the plate blank cutting edge to obtain the sawn plate blank.
And (3) hot pressing, namely placing the sawn plate blank in a hot press, and hot pressing for 17min at the temperature of 140 ℃ and under the pressure of 4Mpa to obtain a hot-pressed finished plate.
And (3) performing post-treatment, namely performing cross cutting on the hot-pressed finished board, cooling a turning plate, aging and storing, cutting the board according to specifications, inspecting, classifying, packaging and warehousing to obtain the flame-retardant veneer oriented strand board.
Example 4
The method of making flame retardant faced oriented strand board as described in examples 1-3 was used in conjunction with comparative runs 1-3 for comparison.
Comparative example 1: the method of making a flame retardant faced oriented strand board as described in example 1 was used with the following exceptions: in the step of spraying the flame retardant, chitosan is used for replacing carboxylated chitosan microspheres in the preparation of the flame retardant.
Comparative example 2: the method of making a flame retardant faced oriented strand board as described in example 1 was used with the following exceptions: in the sizing step, urea-formaldehyde resin is used to replace carboxyl butylbenzene latex modified urea-formaldehyde resin, and the preparation method of the urea-formaldehyde resin comprises the steps of adding a first batch of urea into phenol, heating to 75 ℃, and carrying out heat preservation reaction for 25 min; and then adjusting the pH value to 8, cooling to 20 ℃, adding a second batch of urea, heating to 90 ℃, and then carrying out heat preservation reaction for 35min to obtain the urea-formaldehyde resin.
Wherein, the ratio of phenol: first batch of urea: the mass ratio of the second batch of urea is 13:7: 11.
Comparative example 3: the method of making a flame retardant faced oriented strand board as described in example 1 was used with the following exceptions: in the step of spraying the flame retardant, the nano-scale titanium dioxide and oxidized starch are not added in the preparation of the flame retardant.
The fire retardant faced oriented strand board prepared in examples 1-3 and comparative examples 1-3 had the following criteria:
the test procedure for the 3 month friction test was: and rubbing the surface of the flame-retardant veneerable oriented strand board sample back and forth by using canvas at the speed of 30 times/minute, and testing the combustion performance, smoke generation performance and smoke toxicity of the flame-retardant veneerable oriented strand board sample after lasting for 3 months.
All percentages used in the present invention are mass percentages unless otherwise indicated.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The preparation method of the flame-retardant veneer oriented strand board is characterized by comprising the steps of preparing a core layer raw material, preparing a surface layer raw material, spraying a flame retardant, drying the raw material, screening the raw material, gluing, paving, sawing, cutting, hot pressing and post-treating.
2. The method of claim 1, wherein the spraying of the fire retardant uniformly sprays the fire retardant onto the surface layer wood shaving material and the core layer wood shaving material, respectively, to obtain the core layer wood shaving material and the surface layer wood shaving material with the fire retardant.
3. The method of claim 2, wherein the mass ratio of the surface layer wood shaving raw material to the flame retardant is 100:2-3, and the mass ratio of the core layer wood shaving raw material to the flame retardant is 100: 4-5.
4. The method for preparing the flame-retardant veneerable oriented strand board as claimed in claim 2, wherein the flame retardant comprises, by weight, 20-23 parts of carboxylated chitosan microspheres, 7-9 parts of anhydrous magnesium carbonate, 2-3 parts of powdered decabromodiphenylethane, 8-10 parts of nanoscale titanium dioxide, 5-7 parts of oxidized starch, 1-2 parts of bentonite, 4-5 parts of aluminum hydroxide, and 100-110 parts of anhydrous ethanol;
the particle size of the powdery decabromodiphenylethane is 6-10 mu m;
the particle size of the nano-scale titanium dioxide is 80-150 nm.
5. The preparation method of the flame-retardant veneerable oriented strand board as claimed in claim 2, wherein the preparation method of the flame retardant comprises the steps of adding the carboxylated chitosan microspheres, the anhydrous magnesium carbonate, the powdered decabromodiphenylethane and the nano-scale titanium dioxide into the anhydrous ethanol, then carrying out ultrasonic oscillation dispersion, wherein the ultrasonic oscillation dispersion time is 20-25min, the ultrasonic oscillation dispersion power is 600-700W, the ultrasonic dispersion temperature is 20-30 ℃, then adding the oxidized starch, the bentonite, the aluminum hydroxide and the anhydrous ethanol, stirring at 40-45 ℃ and a stirring speed of 100-120rpm for 40-50min, then carrying out low-temperature reduced pressure concentration under a vacuum condition until the relative density is 1.25-1.35 to obtain the flame retardant, wherein the low-temperature reduced pressure concentration temperature is 70-85 ℃, the vacuum degree is between-0.07 MPa and-0.05 MPa.
6. The method for preparing the flame-retardant veneerable oriented strand board as claimed in claim 4, wherein the carboxylated chitosan microspheres are prepared by dissolving chitosan in 10-12% hydrochloric acid solution by mass, then adding chloroacetic acid and pyruvic acid, and stirring at 30-35 ℃ and at a stirring speed of 120-150rpm for 35-40min to obtain a carboxylated chitosan solution; adding sodium tripolyphosphate into the chitosan solution, stirring at 50-55 deg.C and 80-90rpm for 1.5-2h, filtering, and drying the filter residue at 80-85 deg.C to obtain carboxylated chitosan microsphere;
wherein, the weight ratio of chitosan: 10-12% by mass of hydrochloric acid solution: chloroacetic acid: pyruvic acid: the mass ratio of the sodium tripolyphosphate is 20-22:60-70:5-6:8-10: 13-15.
7. The method for preparing the flame-retardant veneerable oriented strand board as claimed in claim 1, wherein the raw material is dried, the core layer wood shaving raw material and the surface layer wood shaving raw material with the flame retardant are respectively conveyed to a single-channel roller dryer by a fan, the core layer wood shaving raw material and the surface layer wood shaving raw material are dried by using mixed flue gas with the temperature of 400-.
8. The method of claim 1, wherein the sizing comprises sizing the screened core layer wood shaving material and the screened surface layer wood shaving material with a mechanical size mixer to obtain the sized core layer wood shaving material and the sized surface layer wood shaving material;
wherein, the surface layer glue application amount is 2-3%, the glue application amount is based on the mass ratio of the absolute glue to the absolute dry wood shavings, the core layer glue application amount is 2-2.5%, and the application amount is based on the mass ratio of the absolute glue to the absolute dry wood shavings.
9. The method of claim 8, wherein the sizing and adhesive is a carboxylated styrene-butadiene latex modified urea-formaldehyde resin;
the preparation method of the modified urea-formaldehyde resin comprises the steps of uniformly mixing carboxylic styrene-butadiene latex and phenol, adjusting the pH value to 5-6, heating to 70-80 ℃, preserving heat for 30-40min, adding a first batch of urea, heating to 75-80 ℃, preserving heat and reacting for 25-30 min; then adjusting the pH value to 8-9, cooling to 20-25 ℃, adding a second batch of urea, heating to 90-100 ℃, and then carrying out heat preservation reaction for 35-40min to obtain the modified urea-formaldehyde resin.
10. The method of making a flame retardant veneer-able oriented strand board of claim 8, wherein the ratio of carboxylated styrene butadiene latex: phenol: first batch of urea: the mass ratio of the second batch of urea is 30-40:13-15:7-9: 11-15.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114653563A (en) * | 2022-02-11 | 2022-06-24 | 北新国际木业有限公司 | Surface flame-retardant treatment method for OSB (oriented strand board) and flame-retardant OSB |
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| CN113524379B (en) | 2022-08-05 |
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Effective date of registration: 20231121 Address after: 262700 Huanghai Road East Changjiang West Street North, Hou Town, Shouguang City, Weifang City, Shandong Province Patentee after: SHOUGUANG LULI WOOD CO.,LTD. Patentee after: Jiangxi Luli Wood Co.,Ltd. Patentee after: Hunan Luli Wood Industry Co.,Ltd. Address before: 262724 Huanghai Road East Changjiang West Street North, Hou Town, Shouguang City, Weifang City, Shandong Province Patentee before: SHOUGUANG LULI WOOD CO.,LTD. |