CN109366639A - A kind of production method of weather-proof low aldehyde type medium density fiber Special board for cabinet - Google Patents
A kind of production method of weather-proof low aldehyde type medium density fiber Special board for cabinet Download PDFInfo
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- CN109366639A CN109366639A CN201811319420.0A CN201811319420A CN109366639A CN 109366639 A CN109366639 A CN 109366639A CN 201811319420 A CN201811319420 A CN 201811319420A CN 109366639 A CN109366639 A CN 109366639A
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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
- B27D1/08—Manufacture of shaped articles; Presses specially designed therefor
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27L—REMOVING BARK OR VESTIGES OF BRANCHES; SPLITTING WOOD; MANUFACTURE OF VENEER, WOODEN STICKS, WOOD SHAVINGS, WOOD FIBRES OR WOOD POWDER
- B27L11/00—Manufacture of wood shavings, chips, powder, or the like; Tools therefor
- B27L11/08—Manufacture of wood shavings, chips, powder, or the like; Tools therefor of wood fibres, e.g. produced by tearing
-
- 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
- B27N7/00—After-treatment, e.g. reducing swelling or shrinkage, surfacing; Protecting the edges of boards against access of humidity
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21B—FIBROUS RAW MATERIALS OR THEIR MECHANICAL TREATMENT
- D21B1/00—Fibrous raw materials or their mechanical treatment
- D21B1/02—Pretreatment of the raw materials by chemical or physical means
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21B—FIBROUS RAW MATERIALS OR THEIR MECHANICAL TREATMENT
- D21B1/00—Fibrous raw materials or their mechanical treatment
- D21B1/04—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres
- D21B1/06—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres by dry methods
- D21B1/063—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres by dry methods using grinding devices
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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Wood Science & Technology (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Forests & Forestry (AREA)
- Chemical And Physical Treatments For Wood And The Like (AREA)
Abstract
The invention discloses a kind of production methods of weather-proof low aldehyde type medium density fiber Special board for cabinet, 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) edge sealing 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 Special board for cabinet
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.With the fast development of building decoration and upholstery, domestic timber demand
Sharp increase is measured, the notch of wood supply is more and more prominent, and increasing to the utilization scope of fiberboard is timber resources comprehensive utilization
Effective way, be conducive to alleviate China's timber imbalance between supply and demand.
Cupboard board is a huge market in Decoration Industry, and almost every household can all be used.For producing cupboard board
Plate be mainly wood-based plate and all kinds of solid wood boards, wherein wood-based plate is mainly density board and particieboard.Currently on the market
The door-plate of cabinet point can be divided into following several materials from material: solid wood, plastic uptake, double facings, baking vanish, uv paint, classic dumb light paint,
Acrylic, melamine plate etc..Disadvantage in existing cupboard board mainly has that easy to crack, easy to aging, service life is short, content of formaldehyde
More, humidity resistance is not good etc. enough, and the cupboard board of some high-quality is often expensive, promotes and applies very limited.Such as: gold
It is expensive to belong to plate, color is given people a kind of ice-cold feeling, lacked family's warmth sense, and be easily deformed, slightly based on cool tone
It is easy for leaving the hole point of groove-like after micro- collision, scratches more difficult reparation.Price is higher on the market for melamine decorative door-plate,
Fake products is also very much.The cold and hot coefficient of expansion of acrylic cabinet door plate is very big, because temperature change is considered as reserved flexible gap.It is real
Plank selects natural material, and scarcity of resources price is higher, and color is also to be determined by tree species, and alternative is few, excessively dry and tide
Wet environment is also unsuitable for solid wood, thus maintenance get up it is more troublesome, resistance to acid and alkali is poor；Domestic cabinet technological level at present
Still there is gap with the world, domestic solid wood door plate technique is not in place, the problems such as deformation, dry and cracked, surface crude easily occurs.
Therefore, it is good to develop a kind of weather resistance by the present invention, while content of formaldehyde is low, cost is relatively low, the cabinet of safety durable
Personality board has good development prospect, while being also can be to the effective way that waste wood is comprehensively utilized.
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 Special board for cabinet, 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, weather 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 Special board for cabinet, specific steps are as follows:
(1) pretreatment of raw material: Eucalyptus leftover pieces are uniformly mixed with other weedtrees according to weight ratio 1:0.25~0.5, are cut into
The fragment of 3~5cm of length, 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 10~30min, it is then logical to cooker
Enter steam, holding pressure inside the tank is 0.17~0.20Mpa, 1~4min 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 2500~3000r/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 60~75 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 0.3~0.5Mpa, 15~30min 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 245~260 DEG C,
100~130s is suppressed under the conditions of 0.8~1.0Mpa, and 20~50s is suppressed under the conditions of 0.4~0.7Mpa, 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 2.5~the 5.0cm of plate thickness, 0.5~0.8g/cm of density3,
Moisture content is no more than 10%；
(9) veneer hot pressing: 2~3 pieces of medium density fibre board (MDF) smooth, in homogeneous thickness of selection, as substrate layer, with moisture-proof ureaformaldehyde tree
Rouge adhesive carries out assembly；One layer of decorative layer is sticked on surface, puts aluminum oxide wear layer again in decorative layer, into hot press into
Row hot pressing, hot pressing pressure are 1.0~1.5MPa, and hot pressing temperature is 120~130 DEG C, and hot pressing time is 2~4min；
(10) edge sealing: surrounding is with aluminium alloy fringing to get ground Special board for cabinet after cooling.
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 6~10kg modified paraffin lotion and the weather-proof urea-formaldehyde resin adhesive of 150~180kg.
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 para-aminophenol, 5~10 parts of rosin resin, alkyd resin 15~20
Part, 3~5 parts of formaldehyde catching agent, 2~5 parts of weather resisting agent, 10~15 parts of filler.
The formaldehyde catching agent is carboxymethyl cellulose, thiocarbamide, chitosan are mixed in any proportion；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 modified corn starch or modified tapioca starch.
The preparation method of the weather-proof urea-formaldehyde resin adhesive, urea are added in four times, and para-aminophenol adds in two times
Enter, the specific steps are as follows:
(1) formaldehyde is added in reactor, adds the urea of total weight 50~60%, 60~75% para-aminophenol, used
NaOH solution tune pH to 8.5~9.0 is to slowly warm up to 85~90 DEG C, reacts 40~50min；
(2) with formic acid tune pH to 5.0~5.5, the urea and rosin resin of total weight 20~30% is added, 85~90 DEG C of holding anti-
Answer 20~30min；
(3) with NaOH solution tune pH to 8.5~9.0, paraformaldehyde is added, then adds up the urea, remaining right of weight 10~20%
Amino-phenol and weather resisting agent keep 88~90 DEG C of 30~40min of reaction；
(4) with formic acid tune pH to 5.3~5.6, remaining urea is added, reacts 30~40min, adjusts pH to 7.0~7.4, it is cooling
To 35 DEG C or less blowings, para-aminophenol modified urea-formaldehyde resin is obtained；
(5) alkyd resin is added to stir evenly, while stirring addition filler and formaldehyde catching agent, 85~90 DEG C of reactions 30 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.
Rosin resin (rosin resin) it is tricyclic diterpene class compound, containing double-strand and carboxyl-reactive gene, have altogether
Yoke double bond and typical carboxyl reaction.It is dissolved in water, is dissolved in ethyl alcohol, benzene, chloroform, ether, acetone, carbon disulfide and dilute sodium hydroxide
Aqueous solution is mainly used for increase viscosity, change adhesive holds viscosity, cohesive performance.
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..
Thiocarbamide (Thiourea), also known as: thio urea, chemical formula CH4N2S, white and glossiness crystal.Water is dissolved in,
Ethyl alcohol can be dissolved in when heating, it is atomic to be dissolved in ether.Thiocarbamide, can be effectively as the formaldehyde catching agent in urea-formaldehyde resin adhesive
Reduce the content of formaldehyde in urea-formaldehyde resin adhesive.
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.
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 Special board for cabinet of the invention, using eucalyptus bark, branch and
Manufacturing discarded leftover pieces remained by plate is primary raw material, and it is miscellaneous to add pine, linden, birch, Manchurian ash, willow Eucalyptus etc.
Wood is turned waste into wealth, and is the effective way of timber resources comprehensive utilization, is conducive to alleviate China's timber imbalance between supply and demand.Of the invention
Timber utilization rate is 2.5~3.5 times of traditional mask-making technology, and the Special board for cabinet quality product rate of preparation is more than 93%.
2, the production method of weather-proof low aldehyde type medium density fiber Special board for cabinet 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 cabinet 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 Special board for cabinet.
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 Special board for cabinet.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 Special board for cabinet of the invention, urea is added in four times, right
Amino-phenol is added in two portions, and weather-proof urea-formaldehyde resin adhesive obtained, has under the conditions of concrete technology of the present invention
Good weather-proof and waterproof performance, gumminess is good, and content of formaldehyde is low, and through detecting, free formaldehyde content is 0.15~0.17%,
Far below in GB/T 14732 " timber industry adhesive ureaformaldehyde, phenolic aldehyde, melamine resin "≤0.3% standard wants
It asks.
5, the weather-proof urea-formaldehyde resin adhesive that the present invention uses replaces part formaldehyde to be reacted using paraformaldehyde, and
Para-aminophenol is added to be modified it, hydrophobic bond is introduced by cocondensation in Lauxite, can effectively improve urea
The water-fast weatherability of urea formaldehyde；The rosin resin of addition is mainly used for increase viscosity, change adhesive holds viscosity, cohesive performance；
The alkyd resin of addition can promote the gloss and toughness of adhesive, and adhesive force is strong, and have good wearability, weatherability and absolutely
Edge.
6, the formaldehyde catching agent added in the weather-proof urea-formaldehyde resin adhesive of the present invention is gathered by carboxymethyl cellulose, thiocarbamide, shell
Sugar is mixed in any proportion, it is therefore an objective to reduce structure list that is degradable in Lauxite molecular structure or decomposing generation formaldehyde
Member, to be effectively reduced the release of formaldehyde in Lauxite slurry；Chitosan has macromolecular backbone, has in molecule
Free amine group is easily in cationic property, has positive charge, greatly strengthen polarity at salt in an acidic solution, can be certain
Free formaldehyde is adsorbed in degree, to reduce the content of free formaldehyde in urea-formaldehyde resin adhesive；On the long-chain of chitosan also
Many hydroxyls have certain water imbibition, water-fast, the weather resistance of urea-formaldehyde resin adhesive can be improved.
7, the weather resisting agent added in the weather-proof urea-formaldehyde resin adhesive of the present invention has the oxidation resistant effect of reinforced resin, moreover it is possible to
Certain ultraviolet light is absorbed, its fast light, weather resistance is enhanced.Added modified corn starch and modified tapioca starch can reduce
The brittleness of urea-formaldehyde resin adhesive, improves its toughness, gumminess and ageing-resistant performance, also containing lignin in tapioca
Polyphenol compound 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 Special board for cabinet, specific steps are as follows:
(1) pretreatment of raw material: Eucalyptus leftover pieces are uniformly mixed with other weedtrees according to weight ratio 1:0.25, length 3 is cut into
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 10min, is then passed through steaming to cooker
Vapour, holding pressure inside the tank are 0.20Mpa, boiling 1min, 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 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 70 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 0.4Mpa, 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 245 DEG C,
100s is suppressed under the conditions of 1.0Mpa, 25s is suppressed under the conditions of 0.7Mpa, obtains heating platen；
(8) saw sanction, sanding: heating platen passes through cold front heavy rain 3min, 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 2.5cm, density 0.5g/cm3, moisture content is no more than 10%；
(9) veneer hot pressing: 3 pieces of medium density fibre board (MDF) smooth, in homogeneous thickness of selection, as substrate layer, with moisture-proof Lauxite
Adhesive carries out assembly；One layer of decorative layer is sticked on surface, puts aluminum oxide wear layer again in decorative layer, is carried out into hot press
Hot pressing, hot pressing pressure 1.0MPa, hot pressing temperature are 130 DEG C, hot pressing time 2min；
(10) edge sealing: surrounding is with aluminium alloy fringing to get ground Special board for cabinet after cooling.
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 6kg modified paraffin lotion and the weather-proof urea-formaldehyde resin adhesive of 180kg.
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, 10 parts of polyethylene, raw 5 parts of tung oil, 15 parts of n-amyl alcohol, 5 parts of Boratex, 2 parts of dodecyl sodium sulfate；The modification
Dissolving the preparation method comprises the following steps: solid paraffin is heated to 65 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: 35 parts of paraformaldehyde, formaldehyde 40
Part, 165 parts of urea, 12 parts of para-aminophenol, 10 parts of rosin resin, 15 parts of alkyd resin, 5 parts of formaldehyde catching agent, weather resisting agent 5
Part, 15 parts of filler.
The formaldehyde catching agent is carboxymethyl cellulose, thiocarbamide, chitosan ratio 1:2:1 by weight are mixed；Institute
The weather resisting agent stated is 2,4 dihydroxyl benzophenone, DBPC 2,6 ditertiary butyl p cresol, dilauryl thiodipropionate and hydroxide
Calcium；The filler is modified corn starch.
The preparation method of the weather-proof urea-formaldehyde resin adhesive, urea are added in four times, and para-aminophenol adds in two times
Enter, the specific steps are as follows:
(1) formaldehyde is added in reactor, the urea of total weight 55%, 70% para-aminophenol is added, with NaOH solution tune
PH to 8.8 is to slowly warm up to 85 DEG C, reacts 50min；
(2) with formic acid tune pH to 5.0, the urea and rosin resin of total weight 25% is added, keeps 85 DEG C of reaction 30min；
(3) with NaOH solution tune pH to 8.8, paraformaldehyde is added, then adds up the urea of weight 15%, remaining para-aminophenol
And weather resisting agent, keep 90 DEG C of reaction 30min；
(4) with formic acid tune pH to 5.3, remaining urea is added, reacts 30min, adjusts pH to 7.0, is cooled to 35 DEG C or less blowings,
Obtain para-aminophenol modified urea-formaldehyde resin；
(5) alkyd resin is added to stir evenly, filler and formaldehyde catching agent is added while stirring, keeps 90 DEG C of reaction 60min, 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 Special board for cabinet, specific steps are as follows:
(1) pretreatment of raw material: Eucalyptus leftover pieces are uniformly mixed with other weedtrees according to weight ratio 1:0.35, 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 20min, is then passed through steaming to cooker
Vapour, holding pressure inside the tank are 0.18Mpa, boiling 2.5min, and the cork sheet that water content is 78% is obtained after boiling；
(4) grind: the cork sheet that boiling is obtained is transported to refiner and grinds, revolving speed 3000r/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 65 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 15min；
(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 250 DEG C,
115s is suppressed under the conditions of 0.9Mpa, 30s is suppressed under the conditions of 0.5Mpa, 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 3.0cm, density 0.58g/cm3, moisture content is no more than
10%；
(9) veneer hot pressing: 2 pieces of medium density fibre board (MDF) smooth, in homogeneous thickness of selection, as substrate layer, with moisture-proof Lauxite
Adhesive carries out assembly；One layer of decorative layer is sticked on surface, puts aluminum oxide wear layer again in decorative layer, is carried out into hot press
Hot pressing, hot pressing pressure 1.2MPa, hot pressing temperature are 125 DEG C, hot pressing time 3min；
(10) edge sealing: surrounding is with aluminium alloy fringing to get ground Special board for cabinet after cooling.
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 165kg.
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, 15 parts of polyethylene, raw 8 parts of tung oil, 12 parts of n-amyl alcohol, 10 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, 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: 30 parts of paraformaldehyde, formaldehyde 45
Part, 180 parts of urea, 20 parts of para-aminophenol, 8 parts of rosin resin, 20 parts of alkyd resin, 4 parts of formaldehyde catching agent, 4 parts of weather resisting agent,
13 parts of filler.
The formaldehyde catching agent is carboxymethyl cellulose, thiocarbamide, chitosan ratio 1:1:1 by weight are mixed；Institute
The weather resisting agent stated is 2,4 dihydroxyl benzophenone, DBPC 2,6 ditertiary butyl p cresol and dilauryl thiodipropionate composition；Institute
The filler stated is modified tapioca starch.
The preparation method of the weather-proof urea-formaldehyde resin adhesive, urea are added in four times, and para-aminophenol adds in two times
Enter, the specific steps are as follows:
(1) formaldehyde is added in reactor, the urea of total weight 60%, 75% para-aminophenol is added, with NaOH solution tune
PH to 9.0 is to slowly warm up to 90 DEG C, reacts 40min；
(2) with formic acid tune pH to 5.5, the urea and rosin resin of total weight 25% is added, keeps 90 DEG C of reaction 20min；
(3) with NaOH solution tune pH to 9.0, paraformaldehyde is added, then adds up the urea of weight 10%, remaining para-aminophenol
And weather resisting agent, keep 90 DEG C of reaction 40min；
(4) with formic acid tune pH to 5.3, remaining urea is added, reacts 30min, adjusts pH to 7.2, is cooled to 35 DEG C or less blowings,
Obtain para-aminophenol modified urea-formaldehyde resin；
(5) alkyd resin is added to stir evenly, filler and formaldehyde catching agent is added while stirring, keeps 85 DEG C of reaction 45min, 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 Special board for cabinet, specific steps are as follows:
(1) pretreatment of raw material: Eucalyptus leftover pieces are uniformly mixed with other weedtrees according to weight ratio 1:0.5, cut into length 3~
The fragment of 5cm, 0.5~0.8cm 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 0.20Mpa, 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 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 165 DEG C,
Discharge port temperature be 75 DEG C, finally pass through cyclone separator or venturi separator, obtain moisture content be 7% 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 0.3Mpa, 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 260 DEG C,
130s is suppressed under the conditions of 0.8Mpa, 45s is suppressed under the conditions of 0.6Mpa, obtains heating platen；
(8) saw sanction, sanding: heating platen passes through cold front heavy rain 3min, 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 5.0cm, density 0.6g/cm3, moisture content is no more than 10%；
(9) veneer hot pressing: 2 pieces of medium density fibre board (MDF) smooth, in homogeneous thickness of selection, as substrate layer, with moisture-proof Lauxite
Adhesive carries out assembly；One layer of decorative layer is sticked on surface, puts aluminum oxide wear layer again in decorative layer, is carried out into hot press
Hot pressing, hot pressing pressure 1.5MPa, hot pressing temperature are 120 DEG C, hot pressing time 4min；
(10) edge sealing: surrounding is with aluminium alloy fringing to get ground Special board for cabinet after cooling.
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 155kg.
The modified paraffin is prepared from the following raw materials in parts by weight: 90 parts of solid paraffin, 5 parts of lauric acid, and hydrogenation pine
It is 12 parts fragrant, 13 parts of polyethylene, raw 6 parts of tung oil, 15 parts of n-amyl alcohol, 6 parts of Boratex, 3.5 parts of dodecyl sodium sulfate；Described
Dissolving the preparation method comprises the following steps: solid paraffin is heated to 60 DEG C for modified paraffin lotion, is added suitable water and remaining each raw material, stirs
It mixes uniformly, 90min is reacted under the conditions of 95 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, 200 parts of urea, 20 parts of para-aminophenol, 5 parts of rosin resin, 20 parts of alkyd resin, 3 parts of formaldehyde catching agent, 2 parts of weather resisting agent,
15 parts of filler.
The formaldehyde catching agent is carboxymethyl cellulose, thiocarbamide, chitosan are mixed by any example；Described is weather-proof
Agent is 2,4 dihydroxyl benzophenone, DBPC 2,6 ditertiary butyl p cresol and calcium hydroxide；The filler is modified tapioca starch.
The preparation method of the weather-proof urea-formaldehyde resin adhesive, urea are added in four times, and para-aminophenol adds in two times
Enter, the specific steps are as follows:
(1) formaldehyde is added in reactor, the urea of total weight 50%, 60% para-aminophenol is added, with NaOH solution tune
PH to 8.5 is to slowly warm up to 85 DEG C, reacts 40min；
(2) with formic acid tune pH to 5.5, the urea and rosin resin of total weight 30% is added, keeps 85 DEG C of reaction 30min；
(3) with NaOH solution tune pH to 8.5, paraformaldehyde is added, then adds up the urea of weight 12%, remaining para-aminophenol
And weather resisting agent, keep 88 DEG C of reaction 40min；
(4) with formic acid tune pH to 5.3, remaining urea is added, reacts 30min, adjusts pH to 7.4, is cooled to 35 DEG C or less blowings,
Obtain para-aminophenol modified urea-formaldehyde resin；
(5) alkyd resin is added to stir evenly, filler and formaldehyde catching agent is added while stirring, keeps 90 DEG C of reaction 30min, 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 Special board for cabinet 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 Special board for cabinet, 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 1:0.25~0.5, are cut into
The fragment of 3~5cm of length, 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 10~30min, it is then logical to cooker
Enter steam, holding pressure inside the tank is 0.17~0.20Mpa, 1~4min 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, 2500~3000r/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 60~75 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 0.3~0.5Mpa, 15~30min 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 245~260 DEG C,
100~130s is suppressed under the conditions of 0.8~1.0Mpa, and 20~50s is suppressed under the conditions of 0.4~0.7Mpa, 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) veneer hot pressing: 2~3 pieces of medium density fibre board (MDF) smooth, in homogeneous thickness of selection, as substrate layer, with moisture-proof ureaformaldehyde tree
Rouge adhesive carries out assembly；One layer of decorative layer is sticked on surface, puts aluminum oxide wear layer again in decorative layer, into hot press into
Row hot pressing, hot pressing pressure are 1.0~1.5MPa, and hot pressing temperature is 120~130 DEG C, and hot pressing time is 2~4min；
(10) edge sealing: surrounding is with aluminium alloy fringing to get ground Special board for cabinet after cooling.
2. the production method of weather-proof low aldehyde type medium density fiber Special board for cabinet 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 6
~10kg modified paraffin lotion and the weather-proof urea-formaldehyde resin adhesive of 150~180kg.
3. the production method of weather-proof low aldehyde type medium density fiber Special board for cabinet according to claim 1, it is characterised in that:
Medium density fiber 2.5~5.0cm of plate thickness, 0.5~0.8g/cm of density described in step (8)3, moisture content is no more than 10%.
4. the production method of weather-proof low aldehyde type medium density fiber Special board for cabinet 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 Special board for cabinet 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 para-aminophenol, 5~10 parts of rosin resin, 15~20 parts of alkyd resin, formaldehyde is caught
Catch 3~5 parts of 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 Special board for cabinet according to claim 5, it is characterised in that:
The formaldehyde catching agent is carboxymethyl cellulose, thiocarbamide, chitosan are mixed in any proportion；The weather resisting agent is 2,
One of 4- dihydroxy benaophenonel, DBPC 2,6 ditertiary butyl p cresol, dilauryl thiodipropionate, calcium hydroxide are more
Kind；The filler is modified corn starch or modified tapioca starch.
7. the production method of weather-proof low aldehyde type medium density fiber Special board for cabinet 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 para-aminophenol is added in two portions, specific to walk
It is rapid as follows:
(1) formaldehyde is added in reactor, adds the urea of total weight 50~60%, 60~75% para-aminophenol, used
NaOH solution tune pH to 8.5~9.0 is to slowly warm up to 85~90 DEG C, reacts 40~50min；
(2) with formic acid tune pH to 5.0~5.5, the urea and rosin resin of total weight 20~30% is added, 85~90 DEG C of holding anti-
Answer 20~30min；
(3) with NaOH solution tune pH to 8.5~9.0, paraformaldehyde is added, then adds up the urea, remaining right of weight 10~20%
Amino-phenol and weather resisting agent keep 88~90 DEG C of 30~40min of reaction；
(4) with formic acid tune pH to 5.3~5.6, remaining urea is added, reacts 30~40min, adjusts pH to 7.0~7.4, it is cooling
To 35 DEG C or less blowings, para-aminophenol modified urea-formaldehyde resin is obtained；
(5) alkyd resin is added to stir evenly, while stirring addition filler and formaldehyde catching agent, 85~90 DEG C of reactions 30 of holding~
60min is cooled to room temperature, obtains weather-proof urea-formaldehyde resin adhesive.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111037675A (en) * | 2019-12-24 | 2020-04-21 | 杭州好迪装饰家私有限公司 | Wood edge pressing process |
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2018
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111037675A (en) * | 2019-12-24 | 2020-04-21 | 杭州好迪装饰家私有限公司 | Wood edge pressing process |
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Application publication date: 20190222 |