CN109318333A - A kind of production method of weather-proof low aldehyde type medium density fiber wardrobe personality board - Google Patents
A kind of production method of weather-proof low aldehyde type medium density fiber wardrobe personality board Download PDFInfo
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- CN109318333A CN109318333A CN201811319430.4A CN201811319430A CN109318333A CN 109318333 A CN109318333 A CN 109318333A CN 201811319430 A CN201811319430 A CN 201811319430A CN 109318333 A CN109318333 A CN 109318333A
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- 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
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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
- B27N1/003—Pretreatment of moulding material for reducing formaldehyde gas emission
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27N—MANUFACTURE BY DRY PROCESSES OF ARTICLES, WITH OR WITHOUT ORGANIC BINDING AGENTS, MADE FROM PARTICLES OR FIBRES CONSISTING OF WOOD OR OTHER LIGNOCELLULOSIC OR LIKE ORGANIC MATERIAL
- B27N3/00—Manufacture of substantially flat articles, e.g. boards, from particles or fibres
- B27N3/04—Manufacture of substantially flat articles, e.g. boards, from particles or fibres from fibres
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27N—MANUFACTURE BY DRY PROCESSES OF ARTICLES, WITH OR WITHOUT ORGANIC BINDING AGENTS, MADE FROM PARTICLES OR FIBRES CONSISTING OF WOOD OR OTHER LIGNOCELLULOSIC OR LIKE ORGANIC MATERIAL
- B27N3/00—Manufacture of substantially flat articles, e.g. boards, from particles or fibres
- B27N3/08—Moulding or pressing
- B27N3/10—Moulding of mats
- B27N3/12—Moulding of mats from fibres
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27N—MANUFACTURE BY DRY PROCESSES OF ARTICLES, WITH OR WITHOUT ORGANIC BINDING AGENTS, MADE FROM PARTICLES OR FIBRES CONSISTING OF WOOD OR OTHER LIGNOCELLULOSIC OR LIKE ORGANIC MATERIAL
- B27N3/00—Manufacture of substantially flat articles, e.g. boards, from particles or fibres
- B27N3/08—Moulding or pressing
- B27N3/18—Auxiliary operations, e.g. preheating, humidifying, cutting-off
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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Wood Science & Technology (AREA)
- Forests & Forestry (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Chemical And Physical Treatments For Wood And The Like (AREA)
- Dry Formation Of Fiberboard And The Like (AREA)
Abstract
The invention discloses a kind of production methods of weather-proof low aldehyde type medium density fiber wardrobe personality board, it the steps include: (1) pretreatment of raw material, (2) screening, (3) boiling softening, (4) it grinds, (5) it is glued, is dry, (6) precompressed, (7) hot pressing, (8) saw sanction, sanding, (9) veneer hot pressing, (10) cutting edge is to get finished product.The present invention is primary raw material using discarded leftover pieces remained by eucalyptus bark, branch and manufacture plate, adds other weedtrees, turns waste into wealth, it can be achieved that making effective use of to timber resources；Add modified paraffin and weather-proof urea-formaldehyde resin adhesive, and strict control its production process, so that its water-proof climate resisting performance greatly promotes, content of formaldehyde is low, medium density fiber wardrobe personality board obtained, have the advantages that the low aldehyde of environmental protection, weather resistance are good, is the wardrobe personality board of safe and environment-friendly, low aldehyde.
Description
Technical field
The invention belongs to artificial board technology field, the life of specifically a kind of weather-proof low aldehyde type medium density fiber wardrobe personality board
Production method.
Background technique
Wood-based plate is centainly to be machined using timber or other non-wood plants as raw material and be separated into various unit materials
Afterwards, apply or do not apply adhesive and other additives it is glued made of plate or molded article.It mainly include glued board, wood shavings
The three categories product such as (particle) plate and fiberboard, extension product and deep processed product reach hundreds of.Glued board is softened by boiling
Log, be peeled into thin slice greatly, then be mutually perpendicular to place by each direction of wooden fibers, with the synthetic resin gum of water-tolerant
Plate made of bonding, then pressurized, dry, saw side, surfacing.Its number of plies claims respectively at odd number, generally 3~13 layers
Three-ply board, five-ply board etc..There are linden, birch, Manchurian ash, beech, color wood, willow Eucalyptus etc. for making the tree species of glued board.Plane
Card is using applying or do not apply the wood wool of sizing material or plate that wood-fibred material is pressed into, and particieboard density is small, material is equal
It is even but easy to moisture absorption, intensity is low.Fiberboard is to be crushed the waste materials such as bark, wood shavings, branch, impregnate, being ground into wood pulp, then passing through
Extrusion forming is dried and manufactured plate.Depending on its density, it is divided into high-density plate, medium-density plate and low-density plank.
Many wood wastes, such as treetop, branch and slab can be generated in production plywood process, traditional timber factory is all by these
Waste material regards boiler oil, causes very big waste.Therefore, the production for developing fiberboard and its product is that timber resources is comprehensive
The effective way utilized.With the fast development of building decoration and upholstery, domestic Wood demand sharp increase, wood supply
Notch it is more and more prominent.Develop wood-based panel industry to be conducive to alleviate China's timber imbalance between supply and demand, is the weight for saving timber resources
Want approach.
Currently, common wardrobe plate mainly has: woodwork plate, particieboard, fiberboard, solid wood finger-jointed plate, solid wood granule plate
And Europe deals etc..The internal solid-wood material of woodwork plate (being commonly called as lumber core) is different, and density is not of uniform size, only by simple dry
Dry processing, easily warp deformation；Its surface is relatively rough, usually to use a large amount of glue or paint, relatively not environmentally, Form aldehyde release
Amount is high, there is pungent smell.It is nutty structure inside particieboard, is not easy to milling type, be easy to cause showing for sudden and violent tooth when cutting out plate
As so more demanding to process equipment.Solid wood finger-jointed plate is easily deformed, cracking.Good solid wood board is substantially more expensive, it is difficult to
It is a wide range of to promote the use of.Conventional fiberboard moisture resistance is poor, and the coefficient of expansion is larger after absorbing moisture content.The present invention produces a kind of resistance to
Low aldehyde type medium density fiber wardrobe personality board is waited, is that one kind there can be fine the effective way that timber is comprehensively utilized
Development prospect.
Summary of the invention
The object of the present invention is to provide a kind of production method of weather-proof low aldehyde type medium density fiber wardrobe personality board, the party
Method is primary raw material using discarded leftover pieces remained by eucalyptus bark, branch and manufacture plate, adds other weedtrees,
Turn waste into wealth, it can be achieved that being made effective use of to timber resources；Modified paraffin and weather-proof urea-formaldehyde resin adhesive are added, and tight
Lattice control its production process, so that its water-proof climate resisting performance greatly promotes, content of formaldehyde is low, and medium density fiber wardrobe obtained is special
With plate, have the advantages that the low aldehyde of environmental protection, humidity resistance are good, use is safe and environment-friendly.
The invention is realized by the following technical scheme:
A kind of production method of weather-proof low aldehyde type medium density fiber wardrobe personality board, it is characterised in that: specific steps are as follows:
(1) pretreatment of raw material: Eucalyptus leftover pieces are uniformly mixed with other weedtrees according to weight ratio 1:0.3~0.5, growth is cut
Spend the fragment of 3~5cm, 0.5~1cm of width；
The Eucalyptus leftover pieces include eucalyptus bark, branch and manufacture plate remained by discarded leftover pieces；Described is miscellaneous
Wood includes pine, linden, birch, Manchurian ash, willow Eucalyptus etc.；Timber (is counted using preceding first hang 15~20 days after felling
When), and mouldy, generation blackspot is avoided, the wood waste by stacking easily crushes, and fragment pick-up rate is high.
(2) it sieves: wood shavings obtained above is sieved, remove silt and partial size is less than the powder of 0.2cm, and
Iron is removed by strong magnetic inspiration row；
(3) boiling softens: wood shavings is transported in cooker, suitable quantity of water is added to impregnate 15~30min, it is then logical to cooker
Enter steam, holding pressure inside the tank is 0.15~0.18Mpa, 2~4min of boiling, obtained after boiling water content be 75~85% it is soft
Wood chip；
Boiling wood shavings needs the good boiling degree of strict control, and wood shavings boiling degree is inadequate, then in defibrination, energy consumption is high, mill
Machine is easy to damage, and digestion time is too long, then fiber color is deep, influences the quality of production board.
(4) grind: the cork sheet that boiling is obtained is transported to refiner and grinds, and 2000~3000r/min of revolving speed is ground
5~10min is ground, its fiber separation is made；
(5) it is glued, is dry: the fiber of milled being passed through in drying duct, is uniformly sprayed into from pipeline upper and lower ends with Sprayable
Modified paraffin lotion lotion and weather-proof urea-formaldehyde resin adhesive, are passed through hot wind and are dried, pipeline intake air temperature be 155~
165 DEG C, discharge port temperature be 60~70 DEG C, finally pass through cyclone separator or venturi separator, obtain moisture content be 7~
10% fiber delivers into feed bin storage；Exhaust steam is used to heat the water in cooker through over-heat-exchanger；
Exhaust steam is used to heat the water in cooker through over-heat-exchanger；Dried fiber moisture needs strict control, aqueous
Rate is low, and the slab after precompressed is easy to crack in cutting edge, truncation, and moisture content Gao Ze is explosive in precompressed slab.
(6) precompressed: fiber is mated formation into continuous fluffy slab band through spreading machine, and is put down by scraping plain-barreled roll, extra fibre
Dimension sends feed bin back to by blast system；After gauge check, qualified fluffy slab band enter continuous strip formula preformer into
Row precompressed, preload pressure are 0.5~0.7Mpa, 20~30min of squeeze time；
(7) hot pressing: the slab after precompressed is sent into hot press after cutting edge, truncation and carries out hot pressing, and hot pressing temperature is 230~245 DEG C,
120~155s is suppressed under the conditions of 0.8~1.1Mpa, and 30~60s is suppressed under the conditions of 0.5~0.7Mpa, obtains hot pressing
Plate；
(8) saw sanction, sanding: heating platen passes through 3~8min of cold front heavy rain, places 48~72h at room temperature, and saw is cut into fixed specification,
Two sides sanding is to get medium density fibre board (MDF)；Medium density fiber 2.0~the 5.0cm of plate thickness, 0.5~0.7g/cm of density3,
Moisture content is no more than 9%；
(9) it veneer hot pressing: selects medium density fibre board (MDF) smooth, in homogeneous thickness as substrate layer, is uniformly coated with one layer of weather-proof urea
Urea formaldehyde adhesive sticks decorative layer, then sticks one layer of aluminum oxide abrasion-proof paper on plate two sides, is put into hot press progress
Hot pressing, hot pressing pressure are 0.3~0.6MPa, and hot pressing temperature is 100~120 DEG C, and hot pressing time is 1~3min；
(10) cutting edge: it is cooling, cutting edge is carried out to get wardrobe personality board.
The straying quatity of modified paraffin lotion and weather-proof urea-formaldehyde resin adhesive described in step (5) are as follows: every cubic metre of timber
Fragment applies 5~10kg modified paraffin lotion and the weather-proof urea-formaldehyde resin adhesive of 170~200kg.
The modified paraffin is prepared from the following raw materials in parts by weight: 80~100 parts of solid paraffin, lauric acid 3~6
Part, 10~15 parts of hydrogenated rosin, 10~15 parts of polyethylene, raw 3~8 parts of tung oil, 10~15 parts of n-amyl alcohol, Boratex 5~10
Part, 2~5 parts of dodecyl sodium sulfate；The modified paraffin lotion the preparation method comprises the following steps: solid paraffin is heated to 55~65
DEG C dissolution, is added suitable water and remaining each raw material, stirs evenly, 60~90min is reacted under the conditions of 80~100 DEG C, cooling
Modified paraffin can be obtained in homogeneous afterwards.Modified paraffin prepared by the present invention belongs to macromolecule reaction type water repellent agent, Neng Goutong
It crosses electrostatic attraction and macromolecule winding effect and fiber carries out efficiently firm combine and achievees the purpose that be glued waterproof, be low cost
High-effect water-proof agent.
The weather-proof urea-formaldehyde resin adhesive is prepared from the following raw materials in parts by weight: 25~35 parts of paraformaldehyde, first
40~50 parts of aldehyde, 150~200 parts of urea, 10~20 parts of isocyanates, 5~10 parts of Resorcino, 5~10 parts of hydrogenated rosin, alcohol
15~20 parts of acid resin, 3~5 parts of formaldehyde catching agent, 2~5 parts of weather resisting agent, 10~15 parts of filler.
The formaldehyde catching agent is one of chitosan, styrene, polyvinyl alcohol, Essential Oil From Pine Needles or a variety of compositions；
The weather resisting agent is 2,4 dihydroxyl benzophenone, DBPC 2,6 ditertiary butyl p cresol, dilauryl thiodipropionate, hydroxide
One of calcium is a variety of；The filler is that modified corn starch or modified tapioca starch or the two are mixed in any proportion
It closes.
The preparation method of the weather-proof urea-formaldehyde resin adhesive, urea are added in four times, isocyanates, Resorcino point
It is added twice, the specific steps are as follows:
(1) formaldehyde is added in reactor, adds the urea of total weight 50~60%, 60~80% isocyanates, hexichol
Phenol is to slowly warm up to 80~85 DEG C with NaOH solution tune pH to 6.5~7.5, reacts 40~50min；
(2) with formic acid tune pH to 5.5~6.0, the urea and hydrogenated rosin of total weight 20~30% is added, 80~85 DEG C of holding anti-
Answer 20~30min；
(3) with NaOH solution tune pH to 6.5~7.5, paraformaldehyde is added, then adds up the urea, remaining different of weight 10~15%
Weather resisting agent is added in cyanate and Resorcino, keeps 88~92 DEG C of 30~40min of reaction；
(4) with formic acid tune pH to 5.5~6.0, remaining urea is added, reacts 30~40min, adjusts pH to 7.0~7.4, it is cooling
To 35 DEG C or less blowings, modified urea-formaldehyde resin is obtained；
(5) alkyd resin is added to stir evenly, while stirring addition filler and formaldehyde catching agent, 85~88 DEG C of reactions 40 of holding~
60min is cooled to room temperature, obtains weather-proof urea-formaldehyde resin adhesive.
Each raw material used in modified paraffin and urea-formaldehyde resin adhesive of the present invention is described below:
Lauric acid (Lauric acid) it is also known as dodecanoic acid, it is a kind of saturated fatty acid, molecular formula is C12H24O2, colourless needle
Shape crystal, is dissolved in methanol, is slightly soluble in acetone and petroleum ether, not soluble in water, nontoxic.Lauric acid is added to paraffin as modifying agent
In, the stability, toughness and plasticity of paraffin can be improved.
Hydrogenated rosin (hydrogenated rosin) it is amorphous transparent hard resin, containing dihydroabietic acid 75%, relatively
Density 1.045,70~72 DEG C of softening point, refractive index 1.5270, viscosity (60% toluene solution) 3.6mPaS, acid value
162mgKOH/g, saponification number 167mgKOH/g, are dissolved in ethyl alcohol, acetone, dichloroethanes, carbon disulfide, toluene, pine by 203 DEG C of flash-point
In fuel-economizing, petroleum ether, industrial naptha and vegetable oil, have that antioxygenic property is good, brittleness is small, thermal stability is high, the spies such as of light color
Point can be used as antioxidant in adhesive.Its conventional production methods is using rosin as raw material, Pd/C for catalyst, using melting
Method, under 210~270 DEG C, the high temperature and pressure of 10.0~25.0MPa plus hydrogen is made.The present invention applies hydrogenated rosin in modification
In paraffin, as antioxidant and thickener, enhance the waterproof and weather resistance of paraffin.
Polyethylene (polyethylene, abbreviation PE) is a kind of aggregated thermoplastic resin obtained of ethylene, odorless, nothing
Poison, feel ceraceous have excellent resistance to low temperature, and chemical stability is good, are resistant to the erosion of most of soda acids, insoluble under room temperature
In common solvent, water imbibition is small, and electrical insulating property is excellent.Polyethylene is a kind of resinae modifying agent, helps to enhance paraffin crystal
Stability, improve the hardness and brightness of paraffin, improve its leakproofness.
Tung oil (Classification system:tung oil) be the tung oil tree fruit that will pick through mechanical expression, processing refine made of work
Industry vegetable oil, with fast drying, light specific gravity, glossiness is good, adhesive force is strong, heat-resisting, acidproof, alkaline-resisting, anti-corrosion, antirust, does not lead
The characteristics such as electricity, it is widely used.It is the primary raw material of manufacture paint, ink, is largely used as building, machinery, weapons, car and boat, fishing
Tool, the waterproof of electric appliance, anti-corrosion, antirusting paint, and oilcloth, oilpaper, soap, pesticide and pharmaceutical nauseant, insecticide can be made
Deng.Tung oil can be divided into raw tung oil and two kinds of boiled wood oil, and boiled wood oil is process by giving birth to tung oil, and the present invention uses not processed
Life tung oil can effectively improve waterproof, moisture-proof, the corrosion-resistant performance of paraffin as macromolecule film former and waterproofing agent.
Boratex is also referred to as borax or sodium tetraborate, molecular formula Na2B4O7.10H2O can be improved the heat resistance of paraffin
And caking property.Dodecyl sodium sulfate is surfactant, and n-amyl alcohol can improve each as cosurfactant, the two combination
The compatibility and stability of raw material.
Paraformaldehyde (Paraformaldehyde；Polyoxymethylene), alias: poly- formaldehyde, polymerization formaldehyde, secondary first
Aldehyde, solid formaldehyde polymerize formaldehyde, and white amorphous powder is the line polymer of formaldehyde, have formaldehyde odor, molecular formula:
HO-(CH2O)n-H,n=10-100.Paraformaldehyde is soluble in hot water and releases formaldehyde, slow to be dissolved in cold water, can be dissolved in caustic alkali and
Alkali metal carbonate solution, does not dissolve in pure and mild ether, and high polymer is not soluble in water.Low polymerization degree paraformaldehyde replaces unskilled labor
Industry formalin, in synthetic pesticide, synthetic resin, coating and the diversified formaldehyde downstream product such as produce fumigant
In, the energy consumption of dehydration can be not only reduced, but also wastewater treatment capacity can be greatly reduced, can be used as disinfectant, fungicide, insecticide.
Isocyanates (Isocyanate) it is the organic compound with high activity, the isocyanate group (- NCO) that it contains
It is a kind of height unsaturated group, thus has very high reactivity to many compounds, it is easy to carries out addition reaction.It is different
Cyanate has many advantages, such as excellent cementing property, preferable water resistance and resistance to ag(e)ing, formaldehydeless pollution, and to being glued
Material wide adaptation range, adhesive technology is preferable, acidproof, alkaline-resisting, chemical resistance is good, and bonding property is stablized, thus by its
Certain modified effect can be generated by being added in urea-formaldehyde resin adhesive.Moisture in isocyanates and urea-formaldehyde resin adhesive,
The active hydrogen that hydroxyl or amino etc. contain is occurred chemical reaction and is coupled in the form of covalent bond, to form reticular structure.It is common
Diisocyanate include toluene di-isocyanate(TDI) (TDI), isophorone diisocyanate (IPDI), two isocyanide of diphenyl methane
Acid esters (MDI), dicyclohexyl methyl hydride diisocyanate (HMDI), hexamethylene diisocyanate (HDI), lysine diisocyanate
Ester (LDI).
Resorcino (resorcinol) it is also known as l, 3 benzenediols are a kind of very important industrial chemicals, are soluble in
Water, ethyl alcohol, ether are dissolved in chloroform, carbon tetrachloride, do not dissolve in benzene.Since it has the hydroxyl (- OH) of 2 supplied for electronic, and
The conjugation balanced action of phenyl ring so that the hydrogen on C4 and C6 has very high activity, can occur plus hydrogen addition, halogenation, coupling,
The reaction such as acylation, amination, alkylation, nitrification and sulfonation.Using resorcinol-ureaformaldehyde tree of resorcinol and oxymethylene polymerization preparation
Rouge adhesive has many advantages, such as very excellent performance, not only has high bonding strength, enhanced water resistance and weatherability, Er Qie
It at room temperature can also be with rapid curing.
Hydrogenated rosin (hydrogenated rosin), it is amorphous transparent hard resin, contains dihydroabietic acid 75%, phase
To density 1.045,70~72 DEG C of softening point, refractive index 1.5270, viscosity (60% toluene solution) 3.6mPaS, acid value
162mgKOH/g, saponification number 167mgKOH/g, are dissolved in ethyl alcohol, acetone, dichloroethanes, carbon disulfide, toluene, pine by 203 DEG C of flash-point
In fuel-economizing, petroleum ether, industrial naptha and vegetable oil, have that antioxygenic property is good, brittleness is small, thermal stability is high, the spies such as of light color
Point can be used as antioxidant in adhesive.Its conventional production methods is using rosin as raw material, Pd/C for catalyst, using melting
Method, under 210~270 DEG C, the high temperature and pressure of 10.0~25.0MPa plus hydrogen is made.The present invention applies hydrogenated rosin in ureaformaldehyde
In Resin adhesive, hydrophobicity abietic acid (rosin main ingredient) is introduced in the polycondensation reaction of Lauxite and is used as side-chain radical,
The modification of structural unit is carried out to Lauxite.Since there is conjugated double bonds in abietic acid molecule, easily contract with methylolurea
Conjunction forms copolymer, meanwhile, the methylol in modified formaldehyde rosin is also easy to be condensed with imido grpup.Three kinds of condensation modes make hydroxyl first
Base rosin and Lauxite are cross-linked to form tridimensional network, effectively improve the molecular structure of Lauxite, reduce ureaformaldehyde tree
The speed of rouge release formaldehyde.
Alkyd resin is a kind of through being condensed the polymer acetified, by polyalcohol, phthalic anhydride and fatty acid or oil
Oil modified polyester resin made of (fatty acid triglyceride) condensation polymerization.After alkyd resin film-forming, glossy and toughness,
Adhesive force is strong, and there is good wearability, weatherability and insulating properties etc..
Chitosan (chitosan) it is also known as chitosan, it is the chitin that is widely present by nature by deacetylated
What effect obtained, chemical name are as follows: Chitosan (1-4) -2- amino-B-D glucose.Pure chitosan is a kind of white or grey
The sheet or powdery solid of white translucent, tasteless, odorless, non-toxic, pure chitosan slightly pearly luster.Chitosan has big
Molecule backbone has free amine group in molecule, is easily in cationic property, has positive charge, greatly at salt in an acidic solution
Polarity is enhanced greatly, free formaldehyde can be adsorbed to a certain extent, to reduce free formaldehyde in urea-formaldehyde resin adhesive
Content；Hydroxyl there are many more on the long-chain of chitosan has certain water imbibition, the resistance to of urea-formaldehyde resin adhesive can be improved
Water, weather resistance.The chitosan that chitosan used in the present invention is deacetylation >=90%, granularity is 30~100 microns.
Polyvinyl alcohol (polyvinyl alcohol,vinylalcohol polymer), white plates, cotton-shaped or powder
Shape solid, it is tasteless, be dissolved in water (95 DEG C or more), be slightly soluble in dimethyl sulfoxide, insoluble in gasoline, kerosene, vegetable oil, benzene, toluene,
Dichloroethanes, carbon tetrachloride, acetone, ethyl acetate, methanol, ethylene glycol etc..It can be used for manufacturing Pioloform, polyvinyl acetal, resistance to gasoline pipe
Road and vinylon synthetic fibers, fabric-treating agent, emulsifier, paper coating, adhesive, glue etc..Applied in Lauxite
The extra free formaldehyde of absorbable release, reduces the free formaldehyde content in Lauxite, can also improve the resistance to of Lauxite
Aqueous and adhesion strength.
Essential Oil From Pine Needles (Pine needle oil) essential oil that is extracted from pine needle.Various compounds in essential oil can
To be complexed, be aoxidized with formaldehyde, addition etc. react, to destroy and decompose free formaldehyde, reaction both is made to generate water, dioxy
Change carbon and nontoxic reaction product, to achieve the purpose that eliminate the free formaldehyde in urea-formaldehyde resin adhesive.
Dilauryl thiodipropionate (dilauryl thiodipropionate, DLTP), white flock crystalline solid,
It is a kind of thioether substance with special fragrant and sweet breath and lipoid smell, molecular formula C10H58O4S.It is a kind of oil-soluble antioxygen
Agent, its not only small toxicity, but also there is good antioxygenic property and stability, work is cooperateed with phenol antioxidant
With antioxygenic property can be improved.2,4 dihydroxyl benzophenone and DBPC 2,6 ditertiary butyl p cresol, calcium hydroxide are as anti-oxidant
Agent and ultraviolet absorbing agent, for improving the weather resistance of urea-formaldehyde resin adhesive.
Modified corn starch and modified tapioca starch can reduce the brittleness of urea-formaldehyde resin adhesive, improve its toughness, gluing
Property and ageing-resistant performance.The also polyphenol compound containing lignin in tapioca, can react with formaldehyde, to reduce ureaformaldehyde
The content of free formaldehyde in Resin adhesive.
The beneficial effects of the present invention are:
1, the production method of weather-proof low aldehyde type medium density fiber wardrobe personality board of the invention, be using eucalyptus bark, branch with
And discarded leftover pieces remained by manufacture plate are raw material, production obtains medium density fibre board (MDF), it is special to be further processed into wardrobe
With plate, the wardrobe personality board waterproof performance is good, and intensity is high, good toughness, moreover it is possible to improve the utilization rate of timber, timber benefit of the invention
Wardrobe personality board quality product rate with 2.5~3 times that rate is traditional mask-making technology, preparation is more than 90%.
2, the production method of weather-proof low aldehyde type medium density fiber wardrobe personality board of the present invention, timber are first dried in the air using preceding
15~20 days (timing after felling) is set, mouldy, generation blackspot is avoided, the wood waste by stacking easily crushes, timber
Fragment pick-up rate is high；Strict control good boiling degree when boiling wood shavings, modified paraffin and weather-proof urea-formaldehyde resin adhesive
Straying quatity also passes through stringent control, in order to avoid influence the quality of production board.According to medium density fiber wardrobe made from strict technology
Personality board, weather resistance is good, and water-tolerant, content of formaldehyde is low, and intensity is high, and good toughness is safe and environment-friendly, beautiful, wear-resisting reality
With type wardrobe personality board.
3, the modified paraffin that is added of the present invention belongs to macromolecule reaction type water repellent agent by being specifically formulated and technique is made,
Efficiently firm combine can be carried out by electrostatic attraction and macromolecule winding effect and fiber to achieve the purpose that be glued waterproof, be
The high-effect water-proof agent of low cost, can be improved the water-fast weatherability and compressive property of wardrobe personality board.Wherein, the life tung oil of addition is made
For macromolecule film former and waterproofing agent, waterproof, moisture-proof, the corrosion-resistant performance of paraffin can effectively improve；The polyethylene of addition helps
In the stability of enhancing paraffin crystal, the hardness and brightness of paraffin are improved, its leakproofness is improved.
4, the production method of weather-proof low aldehyde type medium density fiber wardrobe personality board of the invention, urea is added in four times, different
Cyanate and Resorcino are added in two portions, the weather-proof Lauxite gluing obtained under the conditions of concrete technology of the present invention
Agent has good weather-proof and waterproof performance, and gumminess is good, and content of formaldehyde is low, through detecting, free formaldehyde content is 0.15~
0.17% ,≤0.3% is far below in GB/T 14732 " timber industry adhesive ureaformaldehyde, phenolic aldehyde, melamine resin "
Standard requirements.
5, the weather-proof urea-formaldehyde resin adhesive that the present invention uses replaces part formaldehyde to be reacted using paraformaldehyde, and
Isocyanates, Resorcino and hydrogenated rosin etc. is added to be modified it, is introduced and is dredged by cocondensation in Lauxite
Water key can effectively improve the water-fast weatherability of Lauxite.The hydrogenated rosin of addition can be in the polycondensation reaction of Lauxite
Middle introducing hydrophobicity abietic acid (rosin main ingredient) is used as side-chain radical, and the modification of structural unit is carried out to Lauxite；Due to
There is conjugated double bonds in abietic acid molecule, and condensation easily occurs with methylolurea and forms copolymer, meanwhile, in modified formaldehyde rosin
Methylol is also easy to be condensed with imido grpup, and three kinds of condensation modes make methylol rosin and Lauxite be cross-linked to form three-dimensional netted knot
Structure effectively improves the molecular structure of Lauxite, reduces the speed of Lauxite release formaldehyde.Resorcinol has 2 confessions
The conjugation balanced action of the hydroxyl (- OH) and phenyl ring of electronics can be with so that the hydrogen on C4 and C6 has very high activity
Occur to add the reaction such as hydrogen addition, halogenation, coupling, acylation, amination, alkylation, nitrification and sulfonation, there is urea-formaldehyde resin adhesive
The advantages that high bonding strength, enhanced water resistance and weatherability.Moisture, hydroxyl of the isocyanates in reaction and in urea-formaldehyde resin adhesive
The active hydrogen that base or amino etc. contain is occurred chemical reaction and is coupled in the form of covalent bond, to form reticular structure.In addition, plus
The alkyd resin entered can promote the gloss and toughness of adhesive, and adhesive force is strong, and have good wearability, weatherability and insulation
Property.
6, the formaldehyde catching agent added in the weather-proof urea-formaldehyde resin adhesive of the present invention by chitosan, styrene, polyvinyl alcohol,
One of Essential Oil From Pine Needles or a variety of compositions, it is therefore an objective to reduce degradable in Lauxite molecular structure or decomposition and generate formaldehyde
Structural unit, to be effectively reduced the release of formaldehyde in Lauxite slurry；Chitosan has macromolecular backbone, molecule
In have free amine group, in an acidic solution easily at salt, be in cationic property, have positive charge, greatly strengthen polarity, can be with
Free formaldehyde is adsorbed to a certain extent, to reduce the content of free formaldehyde in urea-formaldehyde resin adhesive；The long-chain of chitosan
Hydroxyl there are many more upper has certain water imbibition, water-fast, the weather resistance of urea-formaldehyde resin adhesive can be improved.Pine needle
Various compounds in essential oil can be complexed with formaldehyde, be aoxidized, addition etc. is reacted, so that free formaldehyde is destroyed and decomposes,
So that the two reaction is generated water, carbon dioxide and nontoxic reaction product, eliminates dissociating in urea-formaldehyde resin adhesive to reach
The purpose of formaldehyde.The extra free formaldehyde of the absorbable release of polyvinyl alcohol, reduces the free formaldehyde content in Lauxite, may be used also
To improve the water resistance and adhesion strength of Lauxite.
7, the weather resisting agent added in the weather-proof urea-formaldehyde resin adhesive of the present invention is 2,4 dihydroxyl benzophenone, bis- uncle of 2,6-
One of butyl paracresol, dilauryl thiodipropionate, calcium hydroxide are a variety of, and the inoxidizability of resin can be enhanced
It can, moreover it is possible to absorb certain ultraviolet light, enhance its fast light, weather resistance.Added modified corn starch and modified para arrowroot
Powder can reduce the brittleness of urea-formaldehyde resin adhesive, improve its toughness, gumminess and ageing-resistant performance, also contain wood in tapioca
The polyphenol compound of quality class can be reacted with formaldehyde, to reduce the content of free formaldehyde in urea-formaldehyde resin adhesive.
Specific embodiment
Technical solution of the present invention is introduced in order to more detailed, below with reference to embodiment, the present invention is done furtherly
It is bright.
Embodiment 1
A kind of production method of weather-proof low aldehyde type medium density fiber wardrobe personality board, it is characterised in that: specific steps are as follows:
(1) pretreatment of raw material: Eucalyptus leftover pieces are uniformly mixed with other weedtrees according to weight ratio 1:0.3, cut into length 3~
The fragment of 5cm, 0.5~0.7cm of width；
(2) it sieves: wood shavings obtained above is sieved, remove silt and partial size is less than the powder of 0.2cm, and pass through
Strong magnetic inspiration row removes iron；
(3) boiling softens: wood shavings being transported in cooker, adds suitable quantity of water to impregnate 15min, is then passed through steaming to cooker
Vapour, holding pressure inside the tank are 0.18Mpa, boiling 2min, and the cork sheet that water content is 75% is obtained after boiling；
(4) grind: the cork sheet that boiling is obtained is transported to refiner and grinds, revolving speed 2000r/min, grinds 10min, makes
Its fiber separation；
(5) it is glued, is dry: the fiber of milled being passed through in drying duct, is uniformly sprayed into from pipeline upper and lower ends with Sprayable
Modified paraffin lotion lotion and weather-proof urea-formaldehyde resin adhesive, are passed through hot wind and are dried, and pipeline intake air temperature is 155 DEG C,
Discharge port temperature is 60 DEG C, finally passes through cyclone separator or venturi separator, obtains the fiber that moisture content is 10%, conveying
It is stored into feed bin；Exhaust steam is used to heat the water in cooker through over-heat-exchanger；
(6) precompressed: fiber is mated formation into continuous fluffy slab band through spreading machine, and is put down by scraping plain-barreled roll, extra fiber is logical
It crosses blast system and sends feed bin back to；After gauge check, qualified fluffy slab band, which enters continuous strip formula preformer, to be carried out in advance
Pressure, preload pressure 0.5Mpa, squeeze time 30min；
(7) hot pressing: the slab after precompressed is sent into hot press after cutting edge, truncation and carries out hot pressing, and hot pressing temperature is 245 DEG C,
145s is suppressed under the conditions of 1.0Mpa, 60s is suppressed under the conditions of 0.5Mpa, obtains heating platen；
(8) saw sanction, sanding: heating platen passes through cold front heavy rain 8min, places 48h at room temperature, and saw is cut into fixed specification, two facing sands
Light is to get medium density fibre board (MDF)；Medium density fiber the plate thickness 2.0cm, density 0.7g/cm3, moisture content is no more than 9%；
(9) it veneer hot pressing: selects medium density fibre board (MDF) smooth, in homogeneous thickness as substrate layer, is uniformly coated with one layer of weather-proof urea
Urea formaldehyde adhesive sticks decorative layer, then sticks one layer of aluminum oxide abrasion-proof paper on plate two sides, is put into hot press progress
Hot pressing, hot pressing pressure 0.6MPa, hot pressing temperature are 100 DEG C, hot pressing time 3min；
(10) cutting edge: it is cooling, cutting edge is carried out to get wardrobe personality board.
The straying quatity of modified paraffin lotion and weather-proof urea-formaldehyde resin adhesive described in step (5) are as follows: every cubic metre of timber
Fragment applies 5kg modified paraffin lotion and the weather-proof urea-formaldehyde resin adhesive of 200kg.
The modified paraffin is prepared from the following raw materials in parts by weight: 90 parts of solid paraffin, 4 parts of lauric acid, and hydrogenation pine
It is 12 parts fragrant, 15 parts of polyethylene, raw 6 parts of tung oil, 10 parts of n-amyl alcohol, 5 parts of Boratex, 3 parts of dodecyl sodium sulfate；Described changes
Property paraffin wax emulsions the preparation method comprises the following steps: by solid paraffin be heated to 60 DEG C dissolution, suitable water and remaining each raw material is added, stir
Uniformly, 80min is reacted under the conditions of 90 DEG C, modified paraffin can be obtained in homogeneous after cooling.
The weather-proof urea-formaldehyde resin adhesive is prepared from the following raw materials in parts by weight: 25 parts of paraformaldehyde, formaldehyde 50
Part, 170 parts of urea, 15 parts of isocyanates, 5 parts of Resorcino, 10 parts of hydrogenated rosin, 15 parts of alkyd resin, formaldehyde catching agent 5
Part, 2 parts of weather resisting agent, 10 parts of filler.
The formaldehyde catching agent is that chitosan, polyvinyl alcohol and Essential Oil From Pine Needles form in any proportion；Described is weather-proof
Agent is 2,4 dihydroxyl benzophenone, DBPC 2,6 ditertiary butyl p cresol, dilauryl thiodipropionate, calcium hydroxide by any ratio
Example composition；The filler is that modified corn starch and modified tapioca starch mix in any proportion.
The preparation method of the weather-proof urea-formaldehyde resin adhesive, urea are added in four times, isocyanates, Resorcino point
It is added twice, the specific steps are as follows:
(1) formaldehyde is added in reactor, adds the urea of total weight 50%, 60% isocyanates, Resorcino, uses NaOH
Solution tune pH to 7.5 is to slowly warm up to 80 DEG C, reacts 50min；
(2) with formic acid tune pH to 5.5, the urea and hydrogenated rosin of total weight 25% is added, keeps 80 DEG C of reaction 30min；
(3) with NaOH solution tune pH to 7.5, paraformaldehyde is added, then add up the urea of weight 15%, remaining isocyanates and
Resorcino is added weather resisting agent, keeps 90 DEG C of reaction 30min；
(4) with formic acid tune pH to 5.5, remaining urea is added, reacts 30min, adjusts pH to 7.0, is cooled to 35 DEG C or less blowings,
Obtain modified urea-formaldehyde resin；
(5) alkyd resin is added to stir evenly, filler and formaldehyde catching agent is added while stirring, keeps 88 DEG C of reaction 50min, drop
It warms to room temperature, obtains weather-proof urea-formaldehyde resin adhesive.
Embodiment 2
A kind of production method of weather-proof low aldehyde type medium density fiber wardrobe personality board, it is characterised in that: specific steps are as follows:
(1) pretreatment of raw material: Eucalyptus leftover pieces are uniformly mixed with other weedtrees according to weight ratio 1:0.4, cut into length 3~
The fragment of 5cm, 0.5~1cm of width；
(2) it sieves: wood shavings obtained above is sieved, remove silt and partial size is less than the powder of 0.2cm, and pass through
Strong magnetic inspiration row removes iron；
(3) boiling softens: wood shavings being transported in cooker, adds suitable quantity of water to impregnate 20min, is then passed through steaming to cooker
Vapour, holding pressure inside the tank are 0.16Mpa, boiling 3min, and the cork sheet that water content is 80% is obtained after boiling；
(4) grind: the cork sheet that boiling is obtained is transported to refiner and grinds, revolving speed 2500r/min, grinds 8min, makes
Its fiber separation；
(5) it is glued, is dry: the fiber of milled being passed through in drying duct, is uniformly sprayed into from pipeline upper and lower ends with Sprayable
Modified paraffin lotion lotion and weather-proof urea-formaldehyde resin adhesive, are passed through hot wind and are dried, and pipeline intake air temperature is 160 DEG C,
Discharge port temperature be 65 DEG C, finally pass through cyclone separator or venturi separator, obtain moisture content be 8% fiber, convey into
Pan feeding storage is deposited；Exhaust steam is used to heat the water in cooker through over-heat-exchanger；
(6) precompressed: fiber is mated formation into continuous fluffy slab band through spreading machine, and is put down by scraping plain-barreled roll, extra fiber is logical
It crosses blast system and sends feed bin back to；After gauge check, qualified fluffy slab band, which enters continuous strip formula preformer, to be carried out in advance
Pressure, preload pressure 0.7Mpa, squeeze time 20min；
(7) hot pressing: the slab after precompressed is sent into hot press after cutting edge, truncation and carries out hot pressing, and hot pressing temperature is 230 DEG C,
155s is suppressed under the conditions of 1.1Mpa, 30s is suppressed under the conditions of 0.7Mpa, obtains heating platen；
(8) saw sanction, sanding: heating platen passes through cold front heavy rain 5min, places 48h at room temperature, and saw is cut into fixed specification, two facing sands
Light is to get medium density fibre board (MDF)；Medium density fiber the plate thickness 3.5cm, density 0.55g/cm3, moisture content is no more than 9%；
(9) it veneer hot pressing: selects medium density fibre board (MDF) smooth, in homogeneous thickness as substrate layer, is uniformly coated with one layer of weather-proof urea
Urea formaldehyde adhesive sticks decorative layer, then sticks one layer of aluminum oxide abrasion-proof paper on plate two sides, is put into hot press progress
Hot pressing, hot pressing pressure 0.5MPa, hot pressing temperature are 110 DEG C, hot pressing time 2min；
(10) cutting edge: it is cooling, cutting edge is carried out to get wardrobe personality board.
The straying quatity of modified paraffin lotion and weather-proof urea-formaldehyde resin adhesive described in step (5) are as follows: every cubic metre of timber
Fragment applies 8kg modified paraffin lotion and the weather-proof urea-formaldehyde resin adhesive of 185kg.
The modified paraffin is prepared from the following raw materials in parts by weight: 100 parts of solid paraffin, 6 parts of lauric acid, and hydrogenation pine
It is 15 parts fragrant, 12 parts of polyethylene, raw 5 parts of tung oil, 12 parts of n-amyl alcohol, 8 parts of Boratex, 5 parts of dodecyl sodium sulfate；The modification
Dissolving the preparation method comprises the following steps: solid paraffin is heated to 55 DEG C for paraffin wax emulsions, is added suitable water and remaining each raw material, and stirring is equal
It is even, 60min is reacted under the conditions of 100 DEG C, modified paraffin can be obtained in homogeneous after cooling.
The weather-proof urea-formaldehyde resin adhesive is prepared from the following raw materials in parts by weight: 30 parts of paraformaldehyde, formaldehyde 45
Part, 190 parts of urea, 20 parts of isocyanates, 10 parts of Resorcino, 5 parts of hydrogenated rosin, 18 parts of alkyd resin, formaldehyde catching agent 4
Part, 4 parts of weather resisting agent, 13 parts of filler.
The formaldehyde catching agent is that styrene, polyvinyl alcohol and Essential Oil From Pine Needles form in any proportion；Described is weather-proof
Agent is that 2,4 dihydroxyl benzophenone and dilauryl thiodipropionate form in any proportion；The filler is modified cassava
Starch.
The preparation method of the weather-proof urea-formaldehyde resin adhesive, urea are added in four times, isocyanates, Resorcino point
It is added twice, the specific steps are as follows:
(1) formaldehyde is added in reactor, adds the urea of total weight 55%, 70% isocyanates, Resorcino, uses NaOH
Solution tune pH to 7.0 is to slowly warm up to 85 DEG C, reacts 40min；
(2) with formic acid tune pH to 5.8, the urea and hydrogenated rosin of total weight 30% is added, keeps 85 DEG C of reaction 20min；
(3) with NaOH solution tune pH to 7.0, paraformaldehyde is added, then add up the urea of weight 10%, remaining isocyanates and
Resorcino is added weather resisting agent, keeps 92 DEG C of reaction 30min；
(4) with formic acid tune pH to 5.8, remaining urea is added, reacts 30min, adjusts pH to 7.4, is cooled to 35 DEG C or less blowings,
Obtain modified urea-formaldehyde resin；
(5) alkyd resin is added to stir evenly, filler and formaldehyde catching agent is added while stirring, keeps 88 DEG C of reaction 60min, drop
It warms to room temperature, obtains weather-proof urea-formaldehyde resin adhesive.
Embodiment 3
A kind of production method of weather-proof low aldehyde type medium density fiber wardrobe personality board, it is characterised in that: specific steps are as follows:
(1) pretreatment of raw material: Eucalyptus leftover pieces are uniformly mixed with other weedtrees according to weight ratio 1:0.45, length 3 is cut into
The fragment of~5cm, 0.8~1cm of width；
(2) it sieves: wood shavings obtained above is sieved, remove silt and partial size is less than the powder of 0.2cm, and pass through
Strong magnetic inspiration row removes iron；
(3) boiling softens: wood shavings being transported in cooker, adds suitable quantity of water to impregnate 30min, is then passed through steaming to cooker
Vapour, holding pressure inside the tank are 0.15Mpa, boiling 4min, and the cork sheet that water content is 85% is obtained after boiling；
(4) grind: the cork sheet that boiling is obtained is transported to refiner and grinds, revolving speed 3000r/min, grinds 5min, makes
Its fiber separation；
(5) it is glued, is dry: the fiber of milled being passed through in drying duct, is uniformly sprayed into from pipeline upper and lower ends with Sprayable
Modified paraffin lotion lotion and weather-proof urea-formaldehyde resin adhesive, are passed through hot wind and are dried, and pipeline intake air temperature is 165 DEG C,
Discharge port temperature is 70 DEG C, finally passes through cyclone separator or venturi separator, obtains the fiber that moisture content is 7.8%, conveying
It is stored into feed bin；Exhaust steam is used to heat the water in cooker through over-heat-exchanger；
(6) precompressed: fiber is mated formation into continuous fluffy slab band through spreading machine, and is put down by scraping plain-barreled roll, extra fiber is logical
It crosses blast system and sends feed bin back to；After gauge check, qualified fluffy slab band, which enters continuous strip formula preformer, to be carried out in advance
Pressure, preload pressure 0.6Mpa, squeeze time 25min；
(7) hot pressing: the slab after precompressed is sent into hot press after cutting edge, truncation and carries out hot pressing, and hot pressing temperature is 240 DEG C,
155s is suppressed under the conditions of 0.85Mpa, 40s is suppressed under the conditions of 0.6Mpa, obtains heating platen；
(8) saw sanction, sanding: heating platen passes through cold front heavy rain 5min, places 72h at room temperature, and saw is cut into fixed specification, two facing sands
Light is to get medium density fibre board (MDF)；Medium density fiber the plate thickness 4.5cm, density 0.5g/cm3, moisture content is no more than 9%；
(9) it veneer hot pressing: selects medium density fibre board (MDF) smooth, in homogeneous thickness as substrate layer, is uniformly coated with one layer of weather-proof urea
Urea formaldehyde adhesive sticks decorative layer, then sticks one layer of aluminum oxide abrasion-proof paper on plate two sides, is put into hot press progress
Hot pressing, hot pressing pressure 0.5MPa, hot pressing temperature are 120 DEG C, hot pressing time 1min；
(10) cutting edge: it is cooling, cutting edge is carried out to get wardrobe personality board.
The straying quatity of modified paraffin lotion and weather-proof urea-formaldehyde resin adhesive described in step (5) are as follows: every cubic metre of timber
Fragment applies 10kg modified paraffin lotion and the weather-proof urea-formaldehyde resin adhesive of 175kg.
The modified paraffin is prepared from the following raw materials in parts by weight: 80 parts of solid paraffin, 3 parts of lauric acid, and hydrogenation pine
It is 10 parts fragrant, 15 parts of polyethylene, raw 3 parts of tung oil, 15 parts of n-amyl alcohol, 5 parts of Boratex, 5 parts of dodecyl sodium sulfate；Described changes
Property paraffin wax emulsions the preparation method comprises the following steps: by solid paraffin be heated to 65 DEG C dissolution, suitable water and remaining each raw material is added, stir
Uniformly, 90min is reacted under the conditions of 80 DEG C, modified paraffin can be obtained in homogeneous after cooling.
The weather-proof urea-formaldehyde resin adhesive is prepared from the following raw materials in parts by weight: 35 parts of paraformaldehyde, formaldehyde 40
Part, 150 parts of urea, 10 parts of isocyanates, 6 parts of Resorcino, 5 parts of hydrogenated rosin, 20 parts of alkyd resin, 5 parts of formaldehyde catching agent,
2 parts of weather resisting agent, 15 parts of filler.
The formaldehyde catching agent is that chitosan, styrene, polyvinyl alcohol and Essential Oil From Pine Needles form in any proportion；It is described
Weather resisting agent be 2,4 dihydroxyl benzophenone, DBPC 2,6 ditertiary butyl p cresol and calcium hydroxide form in any proportion；It is described
Filler be modified corn starch.
The preparation method of the weather-proof urea-formaldehyde resin adhesive, urea are added in four times, isocyanates, Resorcino point
It is added twice, the specific steps are as follows:
(1) formaldehyde is added in reactor, adds the urea of total weight 60%, 80% isocyanates, Resorcino, uses NaOH
Solution tune pH to 6.5 is to slowly warm up to 80 DEG C, reacts 40min；
(2) with formic acid tune pH to 5.5, the urea and hydrogenated rosin of total weight 20% is added, keeps 80 DEG C of reaction 30min；
(3) with NaOH solution tune pH to 6.5, paraformaldehyde is added, then add up the urea of weight 10%, remaining isocyanates and
Resorcino is added weather resisting agent, keeps 88 DEG C of reaction 30min；
(4) with formic acid tune pH to 5.5, remaining urea is added, reacts 35min, adjusts pH to 7.0, is cooled to 35 DEG C or less blowings,
Obtain modified urea-formaldehyde resin；
(5) alkyd resin is added to stir evenly, filler and formaldehyde catching agent is added while stirring, keeps 88 DEG C of reaction 50min, drop
It warms to room temperature, obtains weather-proof urea-formaldehyde resin adhesive.
Application Example
1, Hengxian County's wood-based plate Co., Ltd produces medium density fiber wardrobe personality board using method of the invention, through examining
It surveys, the phenomenon that trial production does not have rubber granule and layering over the past half year, in plate layer, sand trace and sand leakage phenomenon occurs less than 1%, it is raw
Obtained high-class product is produced up to 93% or more.
Claims (7)
1. a kind of production method of weather-proof low aldehyde type medium density fiber wardrobe personality board, it is characterised in that: specific steps are as follows:
(1) pretreatment of raw material: Eucalyptus leftover pieces are uniformly mixed with other weedtrees according to weight ratio 1:0.3~0.5, growth is cut
Spend the fragment of 3~5cm, 0.5~1cm of width；
(2) it sieves: wood shavings obtained above is sieved, remove silt and partial size is less than the powder of 0.2cm, and pass through
Strong magnetic inspiration row removes iron；
(3) boiling softens: wood shavings is transported in cooker, suitable quantity of water is added to impregnate 15~30min, it is then logical to cooker
Enter steam, holding pressure inside the tank is 0.15~0.18Mpa, 2~4min of boiling, obtained after boiling water content be 75~85% it is soft
Wood chip；
(4) grind: the cork sheet that boiling is obtained is transported to refiner and grinds, 2000~3000r/min of revolving speed, grinding 5
~10min makes its fiber separation；
(5) it is glued, is dry: the fiber of milled being passed through in drying duct, is uniformly sprayed into from pipeline upper and lower ends with Sprayable
Modified paraffin lotion lotion and weather-proof urea-formaldehyde resin adhesive, are passed through hot wind and are dried, pipeline intake air temperature be 155~
165 DEG C, discharge port temperature be 60~70 DEG C, finally pass through cyclone separator or venturi separator, obtain moisture content be 7~
10% fiber delivers into feed bin storage；Exhaust steam is used to heat the water in cooker through over-heat-exchanger；
(6) precompressed: fiber is mated formation into continuous fluffy slab band through spreading machine, and is put down by scraping plain-barreled roll, extra fiber is logical
It crosses blast system and sends feed bin back to；After gauge check, qualified fluffy slab band, which enters continuous strip formula preformer, to be carried out in advance
Pressure, preload pressure are 0.5~0.7Mpa, 20~30min of squeeze time；
(7) hot pressing: the slab after precompressed is sent into hot press after cutting edge, truncation and carries out hot pressing, and hot pressing temperature is 230~245 DEG C,
120~155s is suppressed under the conditions of 0.8~1.1Mpa, and 30~60s is suppressed under the conditions of 0.5~0.7Mpa, obtains hot pressing
Plate；
(8) saw sanction, sanding: heating platen passes through 3~8min of cold front heavy rain, places 48~72h at room temperature, and saw is cut into fixed specification,
Two sides sanding is to get medium density fibre board (MDF)；
(9) it veneer hot pressing: selects medium density fibre board (MDF) smooth, in homogeneous thickness as substrate layer, is uniformly coated with one layer of weather-proof urea
Urea formaldehyde adhesive sticks decorative layer, then sticks one layer of aluminum oxide abrasion-proof paper on plate two sides, is put into hot press progress
Hot pressing, hot pressing pressure are 0.3~0.6MPa, and hot pressing temperature is 100~120 DEG C, and hot pressing time is 1~3min；
(10) cutting edge: it is cooling, cutting edge is carried out to get wardrobe personality board.
2. the production method of weather-proof low aldehyde type medium density fiber wardrobe personality board according to claim 1, it is characterised in that:
The straying quatity of modified paraffin lotion and weather-proof urea-formaldehyde resin adhesive described in step (5) are as follows: every cubic metre of wood shavings applies 5
~10kg modified paraffin lotion and the weather-proof urea-formaldehyde resin adhesive of 170~200kg.
3. the production method of weather-proof low aldehyde type medium density fiber wardrobe personality board according to claim 1, it is characterised in that:
Medium density fiber 2.0~5.0cm of plate thickness, 0.5~0.7g/cm of density described in step (8)3, moisture content is no more than 9%.
4. the production method of weather-proof low aldehyde type medium density fiber wardrobe personality board according to claim 1, it is characterised in that:
The modified paraffin is prepared from the following raw materials in parts by weight: 80~100 parts of solid paraffin, 3~6 parts of lauric acid, and hydrogenation pine
It is 10~15 parts fragrant, 10~15 parts of polyethylene, raw 3~8 parts of tung oil, 10~15 parts of n-amyl alcohol, 5~10 parts of Boratex, dodecyl
2~5 parts of sodium sulfonate；Dissolving the preparation method comprises the following steps: solid paraffin is heated to 55~65 DEG C for the modified paraffin lotion, is added
Suitable water and remaining each raw material, stir evenly, and 60~90min, homogeneous after cooling are reacted under the conditions of 80~100 DEG C
Obtain modified paraffin.
5. the production method of weather-proof low aldehyde type medium density fiber wardrobe personality board according to claim 1, it is characterised in that:
The weather-proof urea-formaldehyde resin adhesive is prepared from the following raw materials in parts by weight: 25~35 parts of paraformaldehyde, formaldehyde 40~50
Part, 150~200 parts of urea, 10~20 parts of isocyanates, 5~10 parts of Resorcino, 5~10 parts of hydrogenated rosin, alkyd resin 15
~20 parts, 3~5 parts of formaldehyde catching agent, 2~5 parts of weather resisting agent, 10~15 parts of filler.
6. the production method of weather-proof low aldehyde type medium density fiber wardrobe personality board according to claim 5, it is characterised in that:
The formaldehyde catching agent is one of chitosan, styrene, polyvinyl alcohol, Essential Oil From Pine Needles or a variety of compositions；Described is resistance to
Time agent is 2,4 dihydroxyl benzophenone, DBPC 2,6 ditertiary butyl p cresol, dilauryl thiodipropionate, one in calcium hydroxide
Kind is a variety of；The filler is that modified corn starch or modified tapioca starch or the two mix in any proportion.
7. the production method of weather-proof low aldehyde type medium density fiber wardrobe personality board according to claim 5, it is characterised in that:
The preparation method of the weather-proof urea-formaldehyde resin adhesive, urea are added in four times, and isocyanates, Resorcino add in two times
Enter, the specific steps are as follows:
(1) formaldehyde is added in reactor, adds the urea of total weight 50~60%, 60~80% isocyanates, hexichol
Phenol is to slowly warm up to 80~85 DEG C with NaOH solution tune pH to 6.5~7.5, reacts 40~50min；
(2) with formic acid tune pH to 5.5~6.0, the urea and hydrogenated rosin of total weight 20~30% is added, 80~85 DEG C of holding anti-
Answer 20~30min；
(3) with NaOH solution tune pH to 6.5~7.5, paraformaldehyde is added, then adds up the urea, remaining different of weight 10~15%
Weather resisting agent is added in cyanate and Resorcino, keeps 88~92 DEG C of 30~40min of reaction；
(4) with formic acid tune pH to 5.5~6.0, remaining urea is added, reacts 30~40min, adjusts pH to 7.0~7.4, it is cooling
To 35 DEG C or less blowings, modified urea-formaldehyde resin is obtained；
(5) alkyd resin is added to stir evenly, while stirring addition filler and formaldehyde catching agent, 85~88 DEG C of reactions 40 of holding~
60min is cooled to room temperature, obtains weather-proof urea-formaldehyde resin adhesive.
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| CN201811319430.4A CN109318333A (en) | 2018-11-07 | 2018-11-07 | A kind of production method of weather-proof low aldehyde type medium density fiber wardrobe personality board |
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| CN201811319430.4A CN109318333A (en) | 2018-11-07 | 2018-11-07 | A kind of production method of weather-proof low aldehyde type medium density fiber wardrobe personality board |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110509368A (en) * | 2019-09-20 | 2019-11-29 | 中国林业科学研究院木材工业研究所 | A kind of complexing plant fiber, complexing fiberboard and its manufacturing method |
| CN112553949A (en) * | 2020-12-11 | 2021-03-26 | 临泉县四红木业有限公司 | Melamine formaldehyde resin adhesive, wear-resistant paper and laminate flooring |
| CN114227853A (en) * | 2021-12-20 | 2022-03-25 | 大亚人造板集团有限公司 | Method for manufacturing high-density fiberboard for mirror-surface floor |
-
2018
- 2018-11-07 CN CN201811319430.4A patent/CN109318333A/en not_active Withdrawn
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110509368A (en) * | 2019-09-20 | 2019-11-29 | 中国林业科学研究院木材工业研究所 | A kind of complexing plant fiber, complexing fiberboard and its manufacturing method |
| CN112553949A (en) * | 2020-12-11 | 2021-03-26 | 临泉县四红木业有限公司 | Melamine formaldehyde resin adhesive, wear-resistant paper and laminate flooring |
| CN114227853A (en) * | 2021-12-20 | 2022-03-25 | 大亚人造板集团有限公司 | Method for manufacturing high-density fiberboard for mirror-surface floor |
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Application publication date: 20190212 |