CN111496949A - Formaldehyde-free moisture-proof shaving board and preparation process thereof - Google Patents
Formaldehyde-free moisture-proof shaving board and preparation process thereof Download PDFInfo
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- CN111496949A CN111496949A CN202010201289.9A CN202010201289A CN111496949A CN 111496949 A CN111496949 A CN 111496949A CN 202010201289 A CN202010201289 A CN 202010201289A CN 111496949 A CN111496949 A CN 111496949A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27D—WORKING VENEER OR PLYWOOD
- B27D1/00—Joining wood veneer with any material; Forming articles thereby; Preparatory processing of surfaces to be joined, e.g. scoring
- B27D1/04—Joining wood veneer with any material; Forming articles thereby; Preparatory processing of surfaces to be joined, e.g. scoring to produce plywood or articles made therefrom; Plywood sheets
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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
- B27N1/00—Pretreatment of moulding material
-
- 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
- B27N3/002—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
- B27N3/02—Manufacture of substantially flat articles, e.g. boards, from particles or fibres from particles
-
- 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
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B21/00—Layered products comprising a layer of wood, e.g. wood board, veneer, wood particle board
- B32B21/02—Layered products comprising a layer of wood, e.g. wood board, veneer, wood particle board the layer being formed of fibres, chips, or particles, e.g. MDF, HDF, OSB, chipboard, particle board, hardboard
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B21/00—Layered products comprising a layer of wood, e.g. wood board, veneer, wood particle board
- B32B21/13—Layered products comprising a layer of wood, e.g. wood board, veneer, wood particle board all layers being exclusively wood
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
- B32B7/04—Interconnection of layers
- B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/40—High-molecular-weight compounds
- C08G18/64—Macromolecular compounds not provided for by groups C08G18/42 - C08G18/63
- C08G18/6492—Lignin containing materials; Wood resins; Wood tars; Derivatives thereof
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/70—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the isocyanates or isothiocyanates used
- C08G18/72—Polyisocyanates or polyisothiocyanates
- C08G18/74—Polyisocyanates or polyisothiocyanates cyclic
- C08G18/76—Polyisocyanates or polyisothiocyanates cyclic aromatic
- C08G18/7657—Polyisocyanates or polyisothiocyanates cyclic aromatic containing two or more aromatic rings
- C08G18/7664—Polyisocyanates or polyisothiocyanates cyclic aromatic containing two or more aromatic rings containing alkylene polyphenyl groups
- C08G18/7671—Polyisocyanates or polyisothiocyanates cyclic aromatic containing two or more aromatic rings containing alkylene polyphenyl groups containing only one alkylene bisphenyl group
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J175/00—Adhesives based on polyureas or polyurethanes; Adhesives based on derivatives of such polymers
- C09J175/04—Polyurethanes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/70—Other properties
- B32B2307/732—Dimensional properties
- B32B2307/734—Dimensional stability
Abstract
The invention relates to the technical field of shaving boards, and particularly discloses an aldehyde-free moisture-proof shaving board which sequentially comprises an upper surface layer, a core layer and a lower surface layer from top to bottom, wherein the layers are bonded together by using an adhesive, and the adhesive is an MDI (diphenyl methane diisocyanate) moisture-proof adhesive; the upper surface layer, the core layer and the lower surface layer comprise wood shavings, and the wood shavings of the upper surface layer and the lower surface layer are 0.5-2.5 mm in length and 0.5-2.5 mm in width; the length of the wood shavings of the core layer is 2.5-50 mm, and the width of the wood shavings is 1.5-4 mm. The invention also provides a preparation method of the aldehyde-free moisture-proof shaving board. The formaldehyde-free moisture-proof shaving board does not contain formaldehyde, has good mechanical property, stable quality in a high-temperature and high-humidity environment, is not easy to expand after absorbing water, and has good moisture resistance.
Description
Technical Field
The invention belongs to the technical field of shaving boards, and particularly relates to an aldehyde-free moisture-proof shaving board and a preparation process thereof.
Background
The shaving board is also called particle board and bagasse board, and is a board made up by using wood leftover bits and pieces or other wood cellulose material through the processes of gluing and hot-pressing, and its shaving board structure is uniform, good in processing property, possesses good sound-absorbing and sound-insulating functions and low in production cost, so that it is extensive in application. The particle board is an important board in the artificial boards, compared with other boards, the particle board has the advantages of relatively less production investment, less energy consumption, low cost and low requirement on the quality of raw materials, and fast growing wood, recycled waste wood and some non-wood materials can be used as raw materials of the particle board, so the particle board has unique advantages in the development of the particle board industry in China with deficient wood resources. The quality of the shaving board is mainly related to the production process, and some process factors including the size of the shavings, the moisture content of the plate blank, adhesives, paving, hot pressing process parameters and the like can influence the quality of the shaving board. Most shaving boards are poor in mechanical property due to the fact that shaving is not properly treated due to the fact that the existing shaving boards are deficient in production technology, and the produced shaving boards are poor in mechanical property, poor in appearance due to the fact that boards deform and deteriorate due to damp expansion in a damp and hot environment, the service life of the shaving boards is shortened, so that the manufactured shaving boards are only suitable for being used in dry rooms, and application of the shaving boards is limited. Urea-formaldehyde resin is mostly adopted as an adhesive for preparing the shaving board at present, and has the advantages of cheap and easily available raw materials, no strict limitation on curing temperature and the like, but the cured resin has hydrophilic free hydroxymethyl, is easily combined with water and has poor moisture resistance; the urea-formaldehyde resin also has the defects of environmental pollution, harm to human health and the like due to the release of free formaldehyde. The development of the aldehyde-free moisture-proof shaving board has important significance for popularization and application of the shaving board.
Disclosure of Invention
The invention aims to provide an aldehyde-free moisture-proof shaving board and a preparation process thereof, thereby overcoming the defects that the existing shaving board contains formaldehyde and has poor moisture resistance.
In order to achieve the purpose, the invention provides an aldehyde-free moisture-proof shaving board which sequentially comprises an upper surface layer, a core layer and a lower surface layer from top to bottom, wherein the layers are bonded together by adopting an adhesive, and the adhesive is an MDI moisture-proof adhesive; the upper surface layer, the core layer and the lower surface layer comprise wood shavings, and the wood shavings of the upper surface layer and the lower surface layer are 0.5-2.5 mm in length and 0.5-2.5 mm in width; the length of the wood shavings of the core layer is 2.5-50 mm, and the width of the wood shavings is 1.5-4 mm.
Preferably, in the aldehyde-free moisture-proof particle board, the preparation method of the MDI moisture-proof adhesive comprises the following steps:
①, putting 1 part of MDA, 10-30 parts of DMC and 0.01-0.02 part of catalyst into a closed reaction kettle, and reacting for 1-5 h under the conditions that the temperature is 145-160 ℃ and the pressure is 2.5 KPa-3.0 MPa to obtain MDC, wherein the catalyst is zinc oxide, zinc powder, dibutyltin dilaurate, dibutyltin didodecyl sulfide or stannous octoate;
②, placing 30-60 parts of MDC obtained in the step ①, 1 part of nano zinc oxide and 60-120 parts of n-hexadecane in a flask of a rotary evaporator, heating to 195-250 ℃ for reaction for 2-5 h, vacuumizing in the reaction process, cooling to room temperature, and filtering to obtain a filtrate;
③, adding TPP into the filtrate obtained in the step ①, and uniformly mixing to obtain the MDI dampproof adhesive, wherein the mass of the TPP is 0.1-5% of that of the filtrate.
A preparation process of the formaldehyde-free moisture-proof shaving board comprises the following steps:
(1) preparing materials: selecting branch wood, miscellaneous wood or wood chips as raw materials, wherein the water content of the raw materials is 30-50%;
(2) chipping and slicing: chipping the raw material in the step (1) to obtain wood chips with the length of less than 100 mm; then, slicing is carried out to obtain wet wood shavings, the thickness of the wet wood shavings is controlled to be less than 1.5mm, and the length of the wet wood shavings is controlled to be less than 40 mm;
(3) and (3) drying: drying the wet wood shavings obtained in the step (2), wherein the water content of the dried wood shavings is 2.0-5.0%;
(4) screening: separating the dried wood shavings according to the size, taking the wood shavings with the length and the width of 0.5-2.5 mm as the wood shavings for the surface layer, and taking the rest wood shavings as the wood shavings for the core layer;
(5) mixing and sizing: respectively spraying a curing agent and an MDI (diphenylmethane diisocyanate) moisture-proof adhesive on the surface of the screened wood shaving, wherein the adhesive application amount is 3-8% of the weight of the wood shaving, the curing agent is 0.15-1.0% of the weight of the wood shaving, the water content of the wood shaving in the core layer after adhesive application is 8-12%, and the water content of the wood shaving in the surface layer is 10-15%;
(6) paving: directionally paving the wood shavings into a slab, wherein the density of the paved slab is 620-680 kg/m3；
(7) Hot pressing: carrying out hot press molding on the plate blank obtained in the step (6), and cooling to obtain a plate;
(8) edge sawing: and (4) sawing the board obtained in the step (7) to prepare the aldehyde-free moisture-proof shaving board.
Preferably, in the preparation process, in the step (3), the drying temperature is 120-150 ℃; in the step (7), the hot pressing process parameters are as follows: the temperature is 185-245 ℃, the unit pressure is 3.0-3.3 MPa, and the hot pressing time is 5-8 s/mm.
Preferably, in the above preparation process, in the step (5), the curing agent is prepared by the following method: mixing an organic solvent and water, adding a pH regulator to regulate the pH to 6.5-7.5, and obtaining a curing agent; the organic solvent is one or more of ethylene glycol, diethanolamine, glycerol and cyclohexanol.
Preferably, in the preparation process, the volume ratio of the organic solvent to the water is 1:4, and the pH regulator is one or more of acetic acid, oxalic acid and benzoic acid.
Preferably, in the preparation process, in the step (7), before hot pressing, a release agent is coated on the upper and lower surfaces of the plate blank, wherein the release agent comprises 5-10% by mass of isomeric alcohol polyoxyethylene ether, 30-35% by mass of lauryl phosphate and 55-65% by mass of ethanol.
Compared with the prior art, the invention has the following beneficial effects:
1. the formaldehyde-free moisture-proof shaving board does not contain formaldehyde, has good mechanical property, stable quality in a high-temperature and high-humidity environment, is not easy to expand after absorbing water, and has good moisture resistance. In the preparation process, the quality of the shaving board is ensured by controlling the process parameters in the production process.
2. The MDI moisture-proof adhesive does not contain formaldehyde, is an environment-friendly adhesive, and enables the prepared shaving board to achieve a higher environment-friendly grade. The adhesive bonding of the invention belongs to chemical bonding, and the whole wood shavings form a macromolecular reticular structure in an anchoring mode through the reaction of-NCO groups in molecules, hydroxyl groups in wood fibers and binding water, so that the prepared shaving board has higher internal bonding strength. After the MDI moisture-proof adhesive is bonded and cured, hydrolysis after reaction does not exist, so that the prepared shaving board has extremely low water absorption expansion rate and good water resistance, and can be used outdoors.
Detailed Description
The following detailed description of specific embodiments of the invention is provided, but it should be understood that the scope of the invention is not limited to the specific embodiments.
Example 1
An aldehyde-free moisture-proof shaving board sequentially comprises an upper surface layer, a core layer and a lower surface layer from top to bottom, wherein the layers are bonded together by MDI (diphenylmethane diisocyanate) moisture-proof adhesive, the upper surface layer, the core layer and the lower surface layer comprise wood shavings, the lengths of the wood shavings of the upper surface layer and the lower surface layer are 0.5-2.5 mm, and the widths of the wood shavings of the upper surface layer and the lower surface layer are 0.5-2.5 mm; the length of the core layer wood shavings is 2.5-50 mm, and the width is 1.5-4 mm.
The preparation method of the MDI moisture-proof adhesive comprises the following steps:
① placing 1 part of MDA (4,4 '-diaminodiphenylmethane), 10 parts of DMC (dimethyl carbonate) and 0.01 part of zinc oxide into a closed reaction kettle, and reacting for 2h at 145 ℃ and 3.0MPa to obtain high-purity MDC (4,4' -diphenylmethane methyl dicarbamate);
② placing 30 parts of MDC obtained in step ①, 1 part of nano zinc oxide and 60 parts of n-hexadecane in a flask of a rotary evaporator, heating to 200 ℃ for reaction for 5 hours, vacuumizing in the reaction process, cooling to room temperature, and filtering to obtain filtrate;
③, adding TPP (tricresyl phosphate) into the filtrate obtained in the step ①, wherein the mass of the TPP is 2% of that of the filtrate, and uniformly mixing to obtain the MDI (diphenylmethane diisocyanate) moisture-proof adhesive.
The preparation process of the aldehyde-free moisture-proof shaving board comprises the following steps:
(1) preparing materials: selecting eucalyptus twigs, miscellaneous trees or wood chips as raw materials, wherein the water content of the raw materials is 30-50%;
(2) chipping and slicing: chipping the raw material in the step (1) by using a chipping machine, wherein the length of the chipped wood chips is less than 100 mm; slicing by using a slicing machine to obtain wet wood shavings, wherein the thickness of the wet wood shavings is controlled to be less than 1.5mm, and the length of the wet wood shavings is controlled to be less than 40 mm;
(3) and (3) drying: conveying the wet wood shavings obtained in the step (2) to a wet material bin through a conveying belt, and drying the wet wood shavings in the wet material bin through a dryer, wherein the drying temperature is 120 ℃, and the moisture content of the dried wood shavings is 2.0-5.0%;
(4) screening: separating the dried wood shavings according to the size, taking the wood shavings with the length and the width of 0.5-2.5 mm as the wood shavings for the surface layer, and taking the rest wood shavings as the wood shavings for the core layer;
(5) mixing and sizing: respectively spraying a curing agent and an MDI (diphenyl-methane-diisocyanate) moisture-proof adhesive on the surface of the screened wood shaving, wherein the glue application amount is 5% of the weight of the wood shaving, the curing agent amount is 0.3% of the weight of the wood shaving, the water content of the wood shaving in the core layer after glue application is 8-12%, and the water content of the wood shaving in the surface layer is 10-15%;
(6) paving: the wood shavings are directionally paved into a plate blank by a paving machine, and the density of the paved plate blank is 650kg/m3；
(7) Hot pressing: and (5) carrying out hot press molding on the plate blank obtained in the step (6), wherein the hot press technological parameters are as follows: the temperature is 240 ℃, the unit pressure is 3.0MPa, the hot pressing time is 5s/mm, and the total hot pressing time is cooled according to the thickness of the finished shaving board to obtain a board;
(8) edge sawing: and (4) sawing the board obtained in the step (7) to prepare the aldehyde-free moisture-proof shaving board.
In the step (5), the preparation process of the curing agent is as follows: mixing ethylene glycol and water at a volume ratio of 1:4 at normal temperature, and adding acetic acid to adjust the pH value to 7 to obtain the curing agent.
In the step (7), before hot pressing, the upper surface and the lower surface of the plate blank are coated with a release agent, wherein the release agent consists of 6 mass percent of isomeric alcohol polyoxyethylene ether, 32 mass percent of lauryl phosphate and 62 mass percent of ethanol. When the formaldehyde-free shaving board is produced, the shaving board is easy to press and stick to the steel belt after hot pressing, and the shaving board is conveniently taken down from the steel belt by coating the release agent, so that the shaving board is protected from being damaged.
The thickness of the aldehyde-free moisture-proof shaving board prepared in the embodiment is 20mm, the physical and chemical properties of the shaving board are detected according to the method in the GB/T17657-2013 standard, and the detection results are shown in Table 1.
Example 2
An aldehyde-free moisture-proof shaving board sequentially comprises an upper surface layer, a core layer and a lower surface layer from top to bottom, wherein the layers are bonded together by MDI (diphenylmethane diisocyanate) moisture-proof adhesive, the upper surface layer, the core layer and the lower surface layer comprise wood shavings, the lengths of the wood shavings of the upper surface layer and the lower surface layer are 0.5-2.5 mm, and the widths of the wood shavings of the upper surface layer and the lower surface layer are 0.5-2.5 mm; the length of the core layer wood shavings is 2.5-50 mm, and the width of the core layer wood shavings is 1.5-4 mm.
The preparation method of the MDI moisture-proof adhesive comprises the following steps:
① putting 1 part of MDA, 20 parts of DMC and 0.02 part of zinc powder into a closed reaction kettle, and reacting for 4 hours at the temperature of 160 ℃ and the pressure of 5kPa to obtain MDC with higher purity;
② placing 50 parts of MDC obtained in step ①, 1 part of nano zinc oxide and 120 parts of n-hexadecane in a rotary evaporator flask, heating to 250 ℃ for reaction for 2 hours, vacuumizing in the reaction process, cooling to room temperature, and filtering to obtain a filtrate;
③, adding TPP into the filtrate obtained in the step ①, wherein the mass of the TPP is 0.5% of that of the filtrate, and uniformly mixing to obtain the MDI moisture-proof adhesive.
The preparation process of the aldehyde-free moisture-proof shaving board comprises the following steps:
(1) preparing materials: selecting eucalyptus twigs, miscellaneous trees or wood chips as raw materials, wherein the water content of the raw materials is 30-50%;
(2) chipping and slicing: chipping the raw material in the step (1) by using a chipping machine, wherein the length of the chipped wood chips is less than 100 mm; slicing by using a slicing machine to obtain wet wood shavings, wherein the thickness of the wet wood shavings is controlled to be less than 1.5mm, and the length of the wet wood shavings is controlled to be less than 40 mm;
(3) and (3) drying: conveying the wet wood shavings obtained in the step (2) to a wet material bin through a conveying belt, and drying the wet wood shavings in the wet material bin through a dryer, wherein the drying temperature is 150 ℃, and the moisture content of the dried wood shavings is 2.0-5.0%;
(4) screening: separating the dried wood shavings according to the size, taking the wood shavings with the length and the width of 0.5-2.5 mm as the wood shavings for the surface layer, and taking the rest wood shavings as the wood shavings for the core layer;
(5) mixing and sizing: respectively spraying a curing agent and an MDI (diphenyl-methane-diisocyanate) moisture-proof adhesive on the surfaces of the screened wood shavings, wherein the glue application amount is 8 percent of the weight of the wood shavings, the curing agent is 1 percent of the weight of the wood shavings, the water content of the wood shavings of the core layer after glue application is 8-12 percent, and the water content of the wood shavings of the surface layer is 10-15 percent;
(6) paving: the wood shavings are directionally paved into a plate blank by a paving machine, and the density of the paved plate blank is 650kg/m3；
(7) Hot pressing: and (5) carrying out hot press molding on the plate blank obtained in the step (6), wherein the hot press technological parameters are as follows: the temperature is 200 ℃, the unit pressure is 3.3MPa, the hot pressing time is 8s/mm, and the total hot pressing time is cooled according to the thickness of the finished shaving board to obtain a board;
(8) edge sawing: and (4) sawing the board obtained in the step (7) to prepare the aldehyde-free moisture-proof shaving board.
In the step (5), the preparation process of the curing agent comprises the following steps: and mixing diethanol amine and water at a volume ratio of 1:4 at normal temperature, adding oxalic acid, and adjusting the pH to 7 to obtain the curing agent.
In the step (7), before hot pressing, the upper surface and the lower surface of the plate blank are coated with a release agent, wherein the release agent consists of 8 mass percent of isomeric alcohol polyoxyethylene ether, 35 mass percent of lauryl phosphate and 57 mass percent of ethanol.
The thickness of the prepared aldehyde-free moisture-proof shaving board is 20mm, the physical and chemical properties of the shaving board are detected according to the method in the GB/T17657-2013 standard, and the detection results are shown in Table 1.
Example 3
An aldehyde-free moisture-proof shaving board sequentially comprises an upper surface layer, a core layer and a lower surface layer from top to bottom, wherein the layers are bonded together by MDI (diphenylmethane diisocyanate) moisture-proof adhesive, the upper surface layer, the core layer and the lower surface layer comprise wood shavings, the lengths of the wood shavings of the upper surface layer and the lower surface layer are 0.5-2.5 mm, and the widths of the wood shavings of the upper surface layer and the lower surface layer are 0.5-2.5 mm; the length of the core layer wood shavings is 2.5-50 mm, and the width of the core layer wood shavings is 1.5-4 mm.
The preparation method of the MDI moisture-proof adhesive comprises the following steps:
① putting 1 part of MDA, 25 parts of DMC and 0.012 part of dibutyltin dilaurate into a closed reaction kettle, and reacting for 3 hours at the temperature of 150 ℃ and the pressure of 1MPa to obtain high-purity MDC;
② placing 60 parts of MDC obtained in step ①, 1 part of nano zinc oxide and 110 parts of n-hexadecane in a flask of a rotary evaporator, heating to 220 ℃ for reaction for 4 hours, vacuumizing in the reaction process, cooling to room temperature, and filtering to obtain a filtrate;
③, adding TPP into the filtrate obtained in the step ①, wherein the mass of the TPP is 4% of that of the filtrate, and uniformly mixing to obtain the MDI moisture-proof adhesive.
The preparation process of the aldehyde-free moisture-proof shaving board comprises the following steps:
(1) preparing materials: selecting eucalyptus twigs, miscellaneous trees or wood chips as raw materials, wherein the water content of the raw materials is 30-50%;
(2) chipping and slicing: chipping the raw material in the step (1) by using a chipping machine, wherein the length of the chipped wood chips is less than 100 mm; slicing by using a slicing machine to obtain wet wood shavings, wherein the thickness of the wet wood shavings is controlled to be less than 1.5mm, and the length of the wet wood shavings is controlled to be less than 40 mm;
(3) and (3) drying: conveying the wet wood shavings obtained in the step (2) to a wet material bin through a conveying belt, and drying the wet wood shavings in the wet material bin through a dryer, wherein the drying temperature is 135 ℃, and the moisture content of the dried wood shavings is 2.0-5.0%;
(4) screening: separating the dried wood shavings according to the size, taking the wood shavings with the length and the width of 0.5-2.5 mm as the wood shavings for the surface layer, and taking the rest wood shavings as the wood shavings for the core layer;
(5) mixing and sizing: respectively spraying a curing agent and an MDI (diphenyl-methane-diisocyanate) moisture-proof adhesive on the surface of the screened wood shaving, wherein the glue application amount is 3% of the weight of the wood shaving, the curing agent is 0.2% of the weight of the wood shaving, the water content of the wood shaving in the core layer after glue application is 8-12%, and the water content of the wood shaving in the surface layer is 10-15%;
(6) paving: the wood shavings are directionally paved into a plate blank by a paving machine, and the density of the paved plate blank is 650kg/m3；
(7) Hot pressing: and (5) carrying out hot press molding on the plate blank obtained in the step (6), wherein the hot press technological parameters are as follows: the temperature is 185 ℃, the unit pressure is 3.2MPa, the hot pressing time is 7s/mm, and the total hot pressing time is determined according to the thickness of the finished shaving board and is cooled to obtain a board;
(8) edge sawing: and (4) sawing the board obtained in the step (7) to prepare the aldehyde-free moisture-proof shaving board.
In the step (5), the curing agent preparation process comprises the following steps: mixing glycerol, diethanolamine and water at a volume ratio of 0.5:0.5:4 at normal temperature, adding a benzoic acid regulator, and regulating the pH to 6.5 to obtain the curing agent.
In the step (7), before hot pressing, the upper surface and the lower surface of the plate blank are coated with a release agent, wherein the release agent is composed of 5% of isomeric alcohol polyoxyethylene ether, 30% of lauryl phosphate and 65% of ethanol in percentage by mass.
The thickness of the prepared aldehyde-free moisture-proof shaving board is 20mm, the physical and chemical properties of the shaving board are detected according to the method in the GB/T17657-2013 standard, and the detection results are shown in Table 1.
Comparative example 1
The shaving board is prepared by adopting Wanhua MDI glue, the preparation process and parameters are the same as those in the example 1, the thickness of the prepared aldehyde-free moisture-proof shaving board is 20mm, the physicochemical properties of the shaving board are detected according to the method in the GB/T17657-2013 standard, and the detection results are shown in Table 1.
Table 1 physicochemical indices of particleboards prepared in the examples of the invention and in the comparative examples
As can be seen from Table 1, the bonding strength and the bending strength in the particle board prepared by the embodiment of the invention are similar to those of the comparative example, but the expansion rate of the water absorption thickness of the embodiment for 24 hours is lower than that of the comparative example, the bending strength after the immersion treatment in the water at 70 ℃ is obviously higher than that of the comparative example, and the moisture resistance of the embodiment of the invention is better than that of the particle board of the comparative example. The formaldehyde-free moisture-proof shaving board disclosed by the invention is good in mechanical property, good in moisture-proof property, free of formaldehyde release, relatively stable in quality under a high-temperature and high-humidity environment, and wide in application prospect.
The foregoing descriptions of specific exemplary embodiments of the present invention have been presented for purposes of illustration and description. It is not intended to limit the invention to the precise form disclosed, and obviously many modifications and variations are possible in light of the above teaching. The exemplary embodiments were chosen and described in order to explain certain principles of the invention and its practical application to enable one skilled in the art to make and use various exemplary embodiments of the invention and various alternatives and modifications as are suited to the particular use contemplated. It is intended that the scope of the invention be defined by the claims and their equivalents.
Claims (7)
1. The formaldehyde-free moisture-proof shaving board is characterized by sequentially comprising an upper surface layer, a core layer and a lower surface layer from top to bottom, wherein the layers are bonded together by adopting an adhesive, and the adhesive is MDI moisture-proof adhesive; the upper surface layer, the core layer and the lower surface layer comprise wood shavings, and the wood shavings of the upper surface layer and the lower surface layer are 0.5-2.5 mm in length and 0.5-2.5 mm in width; the length of the wood shavings of the core layer is 2.5-50 mm, and the width of the wood shavings is 1.5-4 mm.
2. The aldehyde-free moisture-proof particle board according to claim 1, wherein the preparation method of the MDI moisture-proof adhesive comprises the following steps:
3. A process for the preparation of an aldehyde-free moisture-proof particle board as claimed in any of claims 1-2, comprising the steps of:
(1) preparing materials: selecting branch wood, miscellaneous wood or wood chips as raw materials, wherein the water content of the raw materials is 30-50%;
(2) chipping and slicing: chipping the raw material in the step (1) to obtain wood chips with the length of less than 100 mm; then, slicing is carried out to obtain wet wood shavings, the thickness of the wet wood shavings is controlled to be less than 1.5mm, and the length of the wet wood shavings is controlled to be less than 40 mm;
(3) and (3) drying: drying the wet wood shavings obtained in the step (2), wherein the water content of the dried wood shavings is 2.0-5.0%;
(4) screening: separating the dried wood shavings according to the size, taking the wood shavings with the length and the width of 0.5-2.5 mm as the wood shavings for the surface layer, and taking the rest wood shavings as the wood shavings for the core layer;
(5) mixing and sizing: respectively spraying a curing agent and an MDI (diphenyl-methane-diisocyanate) moisture-proof adhesive on the surface of the screened wood shaving, wherein the amount of the applied adhesive is 3-8% of the weight of the wood shaving, the amount of the curing agent is 0.15-1.0% of the weight of the wood shaving, the water content of the wood shaving in the core layer after glue application is 8-12%, and the water content of the wood shaving in the surface layer is 10-15%;
(6) paving: directionally paving the wood shavings into a slab, wherein the density of the paved slab is 620-680 kg/m3；
(7) Hot pressing: carrying out hot press molding on the plate blank obtained in the step (6), and cooling to obtain a plate;
(8) edge sawing: and (4) sawing the board obtained in the step (7) to prepare the aldehyde-free moisture-proof shaving board.
4. The preparation process according to claim 3, wherein in the step (3), the drying temperature is 120-150 ℃; in the step (7), the hot pressing process parameters are as follows: the temperature is 185-245 ℃, the unit pressure is 3.0-3.3 MPa, and the hot pressing time is 5-8 s/mm.
5. The preparation process according to claim 3, wherein in the step (5), the curing agent is prepared by the following method: mixing an organic solvent and water, adding a pH regulator to regulate the pH to 6.5-7.5 to obtain the curing agent, wherein the organic solvent is one or more of ethylene glycol, diethanolamine, glycerol and cyclohexanol.
6. The preparation process according to claim 5, wherein the volume ratio of the organic solvent to the water is 1:4, and the pH regulator is one or more of acetic acid, oxalic acid and benzoic acid.
7. The preparation process according to claim 3, wherein in the step (7), before hot pressing, the upper and lower surfaces of the plate blank are coated with a release agent, and the release agent comprises 5-10% by mass of isomeric alcohol polyoxyethylene ether, 30-35% by mass of lauryl phosphate and 55-65% by mass of ethanol.
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