CN106313265A

CN106313265A - Method for producing high-temperature-resisting oriented particle board by using total-eucalyptus leftover material

Info

Publication number: CN106313265A
Application number: CN201610746809.8A
Authority: CN
Inventors: 陈正照
Original assignee: Guangxi Hengxian Xinweilin Plate Industry Co Ltd
Current assignee: Guangxi Hengxian Xinweilin Plate Industry Co Ltd
Priority date: 2016-08-29
Filing date: 2016-08-29
Publication date: 2017-01-11
Anticipated expiration: 2036-08-29
Also published as: CN106313265B

Abstract

The invention provides a method for producing a high-temperature-resisting oriented particle board by using a total-eucalyptus leftover material. The method comprises the steps of material preparation, drying, debarking, impurity removing, sorting, storage, respective gluing of a surface layer and a core layer, classified paving, pre-hot-pressing molding, sanding of an overcoating and the like, wherein the surface layer is coated with an isocyanate sawdust powder composite adhesive; the core layer is coated with a high-temperature-resisting composite urea resin adhesive; the core layer wood shaving is of a three-layer structure which comprises a core layer middle layer, a core layer upper surface layer and a core layer lower surface layer; the core layer middle layer is paved longitudinally; the core layer upper surface layer, the core layer lower surface layer and the surface layer are paved horizontally. The oriented particle board prepared by the method provided by the invention is 31MPa to 40MPa in parallel static bending intensity, 4605MPa to 4776MPa in parallel elasticity modulus, 1501MPa to 1770MPa in vertical elasticity modulus, 10% to 18% in thickness swelling rate of 24-h water absorption and as high as 89009N in vertical nail-holding power, and is good in dimensional stability and reliability. Moreover, the oriented particle board prepared by the method provided by the invention is also excellent in heat resistance.

Description

The method that full Eucalyptus leftover pieces produce high temperature resistant oriented wood chipboard

Technical field

The invention belongs to wood-based plate and manufacture field, a kind of full Eucalyptus leftover pieces produce high temperature resistant oriented wood chipboard Method.

Background technology

Oriented wood chipboard is one of particieboard new varieties.Wood shavings mat formation molding time, two top layers up and down of oriented wood chipboard Glue mixing wood shavings are arranged by its machine direction stringer, and sandwich layer wood shavings are transversely arranged, form three-decker plate embryo, and then hot pressing Become oriented wood chipboard.The wood shavings shape need length-width ratio of this particieboard is relatively big, and thickness is more thick than the wood shavings of ordinary particle board.

Oriented wood chipboard is log through peeling, is cut into along grain direction and has the flaking of certain geometrical shape, flaking chi Very little the longest 40～140 mm, wide 5～20 mm, thick 0.40～0.60 mm, then drying also apply synthetic resin gum And waterproofing agent, the fiber direction of simulation natural timber is oriented after mating formation into slab, then the one made through high temperature hot pressing Artificial engineering structural panel.

The shape of oriented wood chipboard watch core layer wood shavings, size are the same, simply use orienting spreading, sandwich layer wood shavings laterally to arrange Row, top layer wood shavings longitudinal arrangement, watch core layer wood shavings form certain orientation angle, so that the mechanics of oriented wood chipboard all directions Performance is identical, and the orienting spreading of oriented wood chipboard makes oriented wood chipboard have intensity height, good stability of the dimension, good processability Etc. feature, the advantage of plywood and ordinary particle board being united two into one, the wooden unit both having merged plywood is longer, level divides Feature bright, arranged in a uniform, has drawn again the spy that the ordinary particle board course of processing is simple and easy to operate, be produced on a large scale simultaneously Point, often replaces plywood to do structural wood and uses.

The raw material making oriented wood chipboard includes wood particulate, adhesive and additive, and wood particulate accounts for sheet material dry weight More than 90%, adhesive and additive account for about 10%；Wood particulate takes from forest zone thinnings more, (diameter is generally 8 for small dimension wood Below centimetre), logging residue and wood machining residues etc..Wood particulate includes slabbing, strip, needle-like, granular wood Sheet, wood shavings, wood wool, sawdust etc..Adhesive many uses modified urea-formaldehyde resin glue or melamine glue, or two brood lac be used in conjunction with.

Shaving shape is the deciding factor of oriented wood chipboard quality, therefore first has to produce qualified wood shavings.Timber In processing, the wood shavings of residue can be used as the sandwich layer of particieboard through reprocessing.Top layer wood shavings mainly with fell or processing in senior Residue (timber butt, edges of boards etc.) processing specially is produced.The length of wood shavings, thickness, wide dimensions is because of production method and is used for Make sandwich layer or top layer etc. and different.The process equipment preparing wood shavings has wood chipping equipment, desintegrator, polisher and defibrator, cuts The mode of cutting has cutting, cuts off and broken.For obtaining high-quality wood shavings, be through the process such as the most broken, polishing, the most broken and screening.

Manufactured goods oriented wood chipboard need not after drying, can directly use, and sound-absorbing and sound insulation value are the most fine.But it Also there is its intrinsic shortcoming, because edge roughness, easy moisture absorption, so just seeming special by the edge sealing of furniture technique of particle boards to manufacturing The most important.Relatively big additionally, due to particieboard volume, use its Hepplewhite, for other sheet materials, the most heavier.

In recent years, the Guangdong and Guangxi Provinces of south China, Yunnan, Fujian, Guizhou, Hainan etc. save and start to introduce a fine variety by state-owned east gate, Guangxi woods Field is cultivated and the fast-growing Eucalyptus kind in Guangdong, and fast-growing Eucalyptus is the leaf wood of a kind of light color, and wood grain is tight and irregular, sapwood layer ratio Wider, in white to pale pink；The light brown red that heartwood has.Fast-growing eucalyptus globulus fast growth, can become a useful person for 3 years at present, and hill farmer is big Amount plantation, has accounted for more than the 50% of the available timber in south, has added the arboreal growths such as original seeds such as pinaster, Cunninghamia lanceolata (Lamb.) Hook., margosa Relatively slow, it is no longer able to haggle as wildwood and cuts down, and the timber yield of 1 mu of fast-growing eucalyptus globulus is equivalent to the natural forest products of more than 5 mu Amount, Eucalyptus only accounts for the 13.7% of forest in Guangxi area, but solves Guangxi more than 80%, the timber demand in the whole nation more than 20%.

So fast-growing eucalyptus globulus sheet material manufacturing enterprise rapid emergence, its production method be Eucalyptus is cut down after be peeled into plate, dry With adhesive, plate being bonded into multi-layer sheet again after dry, this multi-layer sheet is also referred to as solid wood board, can be as the office appliance of high-quality, wood Floor, furniture and the multiple use of building-supporting plate, but multiple-plate production process produces substantial amounts of corner timber, either In cut-out, rotary-cut or adhesion process, all can produce many particles, these multi-layer sheet factories, particle is burnt only as fuel, Cause the great wasting of resources.

Chinese patent discloses some methods using culled wood to be raw material production oriented wood chipboard, such as:

1, Chinese patent, application number: 201510061938.9；Applicant: Lu Li wood industry company limited of Shouguang City；Denomination of invention: One can facing oriented wood chipboard and preparation technology thereof；Summary: the present invention relates to one can facing oriented wood chipboard and preparation thereof Technique, can include sandwich layer and top layer by facing oriented wood chipboard, and core layer raw material selects remaining rotary-cut list during plywood production Plate leftover bits and pieces, top layer raw material select integrated timber, core-board, particieboard or MDF production process produce sawdust, wood shavings, Useless fiber, sanding powder, described raw material drying, screening, applying glue, mat formation, slab saw is cut out and prepared after hot pressing can facing orientation plane Card, the MOR of oriented wood chipboard parallel direction can reach 22～30MPa, elastic modelling quantity can reach 3500～ 4800Mpa, surface roughness be less than 0.8 μm, can be directly used for process facing, can also extensively replace plywood, core-board, The wood-based plate such as particieboard, MDF.

2, Chinese patent, application number: 201410578503.7；Applicant's Dieffenbacher plant equipment service (Beijing) has Limit company；Denomination of invention: a kind of oriented structure chipboard production method and system；Summary: the invention discloses a kind of orientation knot Structure particieboard production method, comprises the following steps: S10, the broken veneer strip veneer longitudinal shear that will produce during plywood production Machine carries out length section；S15, employing veneer cross cut shears carry out width section to broken veneer strip；S20, pass through primary screening Obtain the wood shavings of qualified size；S30, it is dried wood shavings by drying machine；S35, sub-elected top layer wood shavings and core by postsearch screening Layer wood shavings；S40, respectively top layer wood shavings and sandwich layer wood shavings are carried out applying glue；S45, by the oriented paving machine wood shavings to having executed glue It is oriented and mats formation；S50, the slab that lays use hot press carry out hot pressing；S55, by the directive construction wood shavings after hot pressing Plate cuts into specification.The present invention can utilize broken veneer strip to produce the oriented structure chipboard of high intensity, improves timber Comprehensive utilization ratio.The invention also discloses a kind of oriented structure chipboard production system.

3, Chinese patent, application number: 201110084640.1；Applicant: Luli Group Co., Ltd；Denomination of invention: one Plant oriented wood chipboard and preparation technology；Summary: the invention discloses a kind of oriented wood chipboard and preparation technology, described particieboard For by adhesive bond three-decker together, including upper and lower two top layers and a middle sandwich layer；Described preparation work Skill, with remaining rotary cut venner leftover bits and pieces during plywood production as raw material, replaces path dimension stock, thus has saved a large amount of Timber, the production cost of reduction；Meanwhile, the length of oriented shaving can be lengthened by the method, thus improve oriented shaving In plate mechanical performance index so that it is there is higher bearing capacity；It is an advantage of the current invention that: with rotary cut venner leftover bits and pieces For raw material, thus save substantial amounts of timber, the production cost of reduction, the MOR of the oriented wood chipboard produced and elasticity Modulus synchronizes to increase, and bearing capacity is greatly improved.

During oriented wood chipboard disclosed in above-mentioned document discloses employing plywood production, remaining rotary cut venner is got a foothold The broken veneer strip produced when material is for raw material or plywood production is the method that raw material is pressed into oriented wood chipboard, but has no The report that corner timber is raw material production full Eucalyptus leftover pieces oriented wood chipboard of employing fast-growing eucalyptus globulus production process of plate, and not See and produce the oriented wood chipboard with high temperature resistant function.Often become because the most existing oriented wood chipboard runs into high temperature Shape, runs into high-strength ultraviolet irradiation or long-time ultraviolet irradiates and often ftractures, and produces to the life of people and makes troubles, and Cause economic loss.

Summary of the invention

For the technological deficiency of above-mentioned existence, it is an object of the invention to provide a kind of employing fast-growing eucalyptus plate production process Corner timber be the method that raw material production has the full Eucalyptus leftover pieces oriented wood chipboard of high temperature resistant function.

The technical solution used in the present invention is as follows:

The method that full Eucalyptus leftover pieces produce high temperature resistant oriented wood chipboard, comprises the steps:

1) by produce the leftover pieces of Eucalyptus plate through first separation metal and stone, chip, deliver to wood chip storage compartment after simple screening Carry out transition storage, then deliver to veneer longitudinal shear machine with transporter and carry out length section, by above-mentioned leftover pieces along longitudinally cutting Become the wood shavings of a length of 50-80 millimeter；Wood shavings after length is cut into slices are transported to veneer cross cut shears and carry out width Wood shavings are transversely cut into the wood shavings that width is 5-20 millimeter by section；Carried out in wet wood shavings feed bin delivered to by transporter again Cross storage；The water content percent by weight of wet wood shavings should be maintained at less than 20%；

The leftover pieces of above-described production Eucalyptus plate be make many Eucalyptus laminate after rotary-cut Eucalyptus plate during unavailable Waste material.

2) wet wood shavings are dried in roller drier delivered to by transporter, and the moisture content controlling wood shavings is 3.0%- 5.0%；

3) dried wood shavings are isolated veneer；Second time separates metal and sandstone；

The method of described separation veneer uses winnower, and in winnower, veneer is blown off owing to proportion is less, and veneer can Using the fuel as air stove；Separate metal and sandstone uses gravity sieve extension set.

4) through the wood shavings that are dried by screening and sorting, length at 50-80 millimeter and width at the watch core of 5-20 millimeter The dry wood shavings of layer are sent to watch core layer dry wood shavings material transitional storehouse by transporter and store, and length is more than 80 millimeters and width is more than 20 millimeters Wood shavings are sent to watch core layer dry wood shavings material transitional storehouse after again shearing and store；

5) the qualified dry wood shavings of watch core layer transport through transporter, deliver in glue mixer, use machinery after the metering of chip metering feed bin Formula glue mixing carries out applying glue respectively to top layer and sandwich layer, and top layer applies isocyanates wood powder end composite adhesive, and resin added is 4% ～8%, resin added is on the basis of over dry glue is to the mass ratio of over dry wood shavings, and sandwich layer applies high temperature resistant composite urea formaldehyde resin adhesive, Applied amount is 3%～6%, and applied amount is on the basis of over dry glue is to the mass ratio of over dry wood shavings；

6) wood shavings after applying glue are delivered to mechanical classification spreading machine through belt conveyer and are mated formation top layer wood shavings and sandwich layer wood shavings, and top layer is dug Spending and longitudinally mat formation, its center core layer wood shavings are divided into 3-tier architecture, including sandwich layer intermediate layer, sandwich layer upper epidermis and sandwich layer layer, mat formation During core material, sandwich layer intermediate layer is for longitudinally mating formation, and the upper and lower surface layer of sandwich layer is mated formation sandwich layer wood shavings, for laterally mating formation, sandwich layer Upper and lower Surface pavement top layer wood shavings, obtain the particle mat of uniform ground, determine particle mat according to hot press size Size specification；

7) particle mat being carried out precompressed, the pressure of precompressed is 0.8～0.9MPa, the time 5～8min；Finally carry out heat Pressure, hot pressing pressure 2.5～3MPa, temperature is 200～210 DEG C, and hot pressing time is every millimeter of thickness of slab 80s～85s, then delivers to Balance in storehouse quenched, prepare particieboard substrate；

8) the particieboard substrate of step 7) being carried out coarse sand sanding, sand falls 0.8-1.5 millimeter；Then by the particieboard base after coarse sand Plate carries out fine sand sanding, and sand falls 0.5-0.8 millimeter, obtains sanding substrate；It is combined toward sanding substrate coating isocyanates wood powder end Adhesive, the poplar decoration panel that patch 8mm is thick, obtain poplar skin thick china, in pressure of colding pressing be 13-15 MPa carry out colding pressing 2 little Shi Hou, utilizes hot pressing pressure machine to carry out hot-forming, hot pressing pressure 15-20MPa, and temperature is 110-120 DEG C, and last fine sand is thrown Light, saws limit, sorting packing, obtains high temperature resistant oriented wood chipboard.

Above-mentioned steps 5) and step 8) described in isocyanates wood powder end composite adhesive, be with isocyanates for this Body, will add Carbimide. to through the wood powder end of processing according to the 10-20% that wood powder end addition is isocyanate weight In ester, after stirring, form uniform isocyanates wood powder end composite adhesive.

The course of processing at described wood powder end is: by length in wood chip shear history, less than 50 millimeters and width is less than 5 The wood shavings of millimeter grind to form wood powder end, and controlling its particle diameter is 0.1-3 micron, and are dried at wood powder end to moisture content and are less than Less than 3%.

High temperature resistant composite urea formaldehyde resin adhesive described in step 5), is made up of the raw material of following parts by weight:

Cyanurotriamide modified urea resin 50～100 parts；

Oxytarch 20～30 parts；

Polyvinyl alcohol 1～3 parts；

Hydrogenated rosin 3～8 parts；

Propanediol polyoxypropylene polyvinylether 2～3 parts；

Polyisocyanate 4～6 parts；

Isobutyl triethoxy silane 0.5～5 parts；

Phenolate lignin 5～10 parts；

Clear water 100～200 parts；

High temperature resistant filler 2～5 parts.

Described high temperature resistant filler is the one in flake asbestos, mica powder and titanium dioxide powder or a combination thereof thing.

The production method of above-mentioned high temperature resistant composite urea formaldehyde resin: first the clear water of parts by weight is put in reactor, heating To 80-100 DEG C, it is subsequently adding the poly-second of the hydrogenated rosin of parts by weight, isobutyl triethoxy silane and propanediol polyoxypropylene Alkene ether, stirs 10 minutes to 30 minutes, adds the polyvinyl alcohol of parts by weight, phenolate lignin, be allowed to dissolve, and adds weight The amount cyanurotriamide modified urea resin of number, Oxytarch and high temperature resistant filler, keep 80-90 DEG C of stirring reaction 2-5 hour, The polyisocyanate adding parts by weight in 10-20 minute before use, mixing and stirring can use.

Cyanurotriamide modified urea resin of the present invention uses Guangxi Nanning Green Park Beilin Wood Industry Co., Ltd. to study Cyanurotriamide modified urea resin, number of patent application: CN 201310353442.X；The applying date: 2013.08.14；Open (public Accuse) number: CN 103408711A；Application (patent right) people: Guangxi Nanning Green Park Beilin Wood Industry Co., Ltd., this tripolycyanamide changes Property Lauxite primary raw material be formaldehyde, tripolycyanamide and carbamide, use disposably add formaldehyde, several times add carbamide and The method of tripolycyanamide, controls reaction rate, it is to avoid the generation of gelatin phenomenon, promotes the reaction completely of formaldehyde.Repeatedly add urine Element, the carbamide every time added is the most different with the polymerization rate of formaldehyde and condition, after being divided into prepolymerization, being polymerized and be polymerized Phase three phases, the amount that each stage adds carbamide is different, and reaction temperature is the most different, by this technique, it is to avoid The generation of polymerization process gelatin phenomenon, the Lauxite narrow molecular weight distribution of gained, residual formaldehyde is low, is used for producing artificial Plate, it is possible to decrease the burst size of methanal of wood-based plate.

Above-described high temperature resistant composite urea formaldehyde resin adhesive, the function of each raw material is as follows:

Cyanurotriamide modified urea resin, for adhesive major ingredient.Urea-formaldehyde resin adhesive is a kind of thermosetting polymer adhesive. Owing to its technique is simple, cheaper starting materials, the advantages such as adhesive strength is high, water white transparency, be widely used in plywood, particieboard, The industries such as medium density fibre board (MDF), the production of artificial board and interior decoration, can buy in Market of Adhesives.Band ring molecule Tripolycyanamide introduce in Lauxite, form tridimensional network, enclose many hydrophilic groups, change resin matrix knot Structure, promotes resin crosslinks, thus has reached to improve the adhesion strength of resin, resistance to water and the purpose of ageing resistance, the most again Avoid the shortcoming that simple melamine resin is relatively costly.

Oxytarch be starch in acid, alkali, neutral medium with oxidant effect, make starch oxidation and a kind of change of obtaining Property starch.Oxytarch product colour is pure white, sticks with paste transparent, good film-forming property, and freeze-thaw resistance is good, is the thickening of low viscosity high concentration Agent, is widely used in weaving, papermaking, food and Fine Chemical.Oxytarch, can be multiple with more aldehyde radical and carboxyl During closing Lauxite polymer reaction, generate acetal and hemiacetal structure, thus improve the ageing-resistant performance of Lauxite； Simultaneous oxidation starch can be combined with the free formaldehyde in cyanurotriamide modified urea resin, can reduce free formaldehyde content；Oxidation On the other hand starch, can reduce cyanurotriamide modified urea resin addition as viscosity complexing agent again, reduce and produce Cost.

Polyvinyl alcohol, for toughener so that the oriented wood chipboard intensity produced increases.

Hydrogenated rosin, for antioxidant so that the oriented wood chipboard produced is not easy to go bad, and extends the life-span, anti-old Change.

Propanediol polyoxypropylene polyvinylether, for defoamer, prevents adhesive from having bubble cavity to produce during using.

Polyisocyanate is firming agent, is characterized in having the highest wearability, and stable chemical nature, and intensity is high, The crosslinked action itself having, can improve heat-resisting, water, plasticizer and the performance of solvent of adhesive.

Bridging agent, selects isobutyl triethoxy silane, and its one end can be combined with Lauxite carbonyl, and the other end can be with The hydroxy combining of starch, strengthens its plank intensity.

Lignin molecular mass after phenolate is reacted reduces, and increases reaction active groups, can eliminate part free formaldehyde. The preparation method of phenolate lignin is: is placed in separation container by the black liquid using alkaline boiling method slurrying, removes with screen cloth Undissolved float, settles 4 hours after stirring, discharge lower floor silt, takes the upper strata black liquor vacuum drying containing alkali lignin Machine carries out vacuum spray drying process, obtains powdery alkali lignin；Take powdery alkali lignin and put in acidifier, add 70wt% sulphuric acid, after stirring, is warming up to 140-160 DEG C, sulfonating reaction 1-2 hour；Evaporate through standard vertical-tubes Device, circulation rate is 0.4m/s-0.5m/s, and controlling discharging moisture is 30wt%, precipitation, through filtering, being dried to water content For 15wt%；By lignin: phenol weight ratio is 1:1 addition phenol, control temperature 85-95 DEG C, insulation reaction 1 hour, Finally i.e. obtain phenolate lignin with 30wt% sodium hydroxide regulation pH to 6.5-7.0.

The preparation of described Oxytarch:

(1), select glass apparatus and assemble synthesizer:

JJ600 electronic balance；Digital display thermostat water bath；Digital display constant speed stirrer；There-necked flask；Electric heating constant-temperature blowing drying box； NDJ-79 Rotary Viscosimeter.

(2) reagent chemicals:

Raw material: tapioca (moisture 13.8%)；

Reagent: hydrogen peroxide (30%), Copper hydrate, copper sulfate, sodium sulfite (being AR).

(3) preparation principle:

Starch is under oxidant effect, and the hydroxyl oxidable one-tenth carboxyl (-COOH) on glucose unit, it makes binding agent Stability be improved significantly.Oxidation decreases the quantity of hydroxyl in starch molecule, makes molecular association be obstructed, thus subtracts The weak binding ability of intermolecular hydrogen chain.Meanwhile, glucosides chain break, make macromolecules degradation, starch molecule amount reduces, thus increases Dissolubility, mobility and caking property are added.In the presence of liquid caustic soda, the hydroxy combining not oxidized with starch, destroy part hydrogen Key, makes declines between macromole, thus easy swelling gelatinizing, give its caking property.

Preparation process is as follows:

Weighing 200g tapioca in 1000mL there-necked flask, add water furnishing 18～the starch milk of 21 ° of B é, stirs, slowly The slow sodium hydroxide solution dripping a certain amount of 5%～7% concentration.After water-bath rises to design temperature, add the copper sulfate of 0.01%.So A certain amount of hydrogen peroxide of rear addition, after isothermal reaction certain time, adds 0.4g sodium sulfite, and stirring 10min terminates reaction. Reaction terminate after, with in dilute hydrochloric acid and reacting liquid pH value be 5.5～6.0.Sucking filtration is dehydrated, washes clean, places 40-50 in baking oven Dry at DEG C, pulverize, sieve and i.e. obtain product.The Oxytarch of above-mentioned use can produce with jumbo reactor.

Compared with prior art, the positive effect of the present invention is:

1, using unavailable waste material during rotary-cut Eucalyptus plate multilamellar Eucalyptus plate---i.e. the leftover pieces hot pressing of Eucalyptus is raw Produce oriented wood chipboard, owing to Eucalyptus is a kind of fast growing wood, be peeled into plate after felling, with adhesive, plate bonded the most again This multi-layer sheet is become to be also referred to as solid wood board, can be as the multiple use of the office appliance of high-quality, timber floor, furniture and building-supporting plate On the way, but multiple-plate production process produces a large amount of either in cut-out, rotary-cut or adhesion process, all can produce many particles, These multi-layer sheet factories, particle is burnt only as fuel, causes the great wasting of resources, and the present invention effectively utilizes Eucalyptus Waste material in the material course of processing, forms the zero-emission of timber waste, and cost of material reduces about 55%, has both saved resource, Protect again environment, in today that wood raw material lacks day by day, be the Resource comprehensive utilization method that a kind of benefit is the highest, and processing Operation is simple, reasonable, and processing cost is low, and energy consumption reduces at least 15%, and cost of labor reduces at least 10%, and crudy is high, suitable For industrialized production.

2, for Eucalyptus bark problem, we use winnower to remove bark, enhance product performance.

3, the present invention is for cost-effective (isocyanates is without aldehyde adhesive, and cost is high), uses top layer to add isocyanide Acid esters wood powder end adhesive, sandwich layer uses the method for fire-retardant composite urea formaldehyde resin adhesive,

4, in the present invention, isocyanates gluing agent is dispersed in wood powder end, utilizes the loose structure on surface, wood powder end, Carbimide gluing agent is adsorbed onto in tiny wood powder end, forms uniform isocyanates wood powder end composite adhesive, Reduce the permeability of isocyanates gluing agent.

5, in the present invention, the characteristic produced according to Eucalyptus plate (raw material of oriented wood chipboard is the leftover pieces of Eucalyptus) uses Cyanurotriamide modified urea resin, as adhesive major ingredient, has technique simple, cheaper starting materials, and adhesive strength is high, water white transparency Etc. advantage, and the release of low formaldehyde gas, it is a kind of environmental type resin, the resistance to water of Lauxite can be improved, and prevent Glue-line shrinks and reduces internal stress, improves ageing-resistant performance, increases glue solid content, viscosity and tack, extends working life.And use Hydrogenated rosin is antioxidant so that the oriented wood chipboard produced is not easy to go bad, and extends the life-span, anti-aging；Use poly- Vinyl alcohol is toughener so that the oriented wood chipboard intensity produced increases；Use propanediol polyoxypropylene polyvinylether, for Defoamer, prevents adhesive from having bubble cavity to produce during using；Employing polyisocyanate is firming agent；Select isobutyl group three Ethoxysilane is as bridging agent, and its one end can be combined with Lauxite carbonyl, and the other end can strengthen with the hydroxy combining of starch Its plank intensity；Containing a large amount of active groups in phenolate lignin, as formaldehyde catching agent, part free formaldehyde can be eliminated； Use Oxytarch, as viscosity complexing agent, cyanurotriamide modified urea resin addition can be reduced, cost-effective；Asbestos One in powder, mica powder and titanium dioxide powder or a combination thereof thing, as the high temperature resistant filler of the present invention, organic-inorganic is high temperature resistant Raw material combines so that heat-resisting effect is more preferably.

6, being prepared by the method for the present invention the oriented wood chipboard obtained, residual formaldehyde amount is low, and fire resistance is good, intensity/hard Degree is 3-5 times of conventional panels, and automobile is all pressed constantly, and bearing is good, indeformable, and Hepplewhite ruggedness is good, processing characteristics Good, can saw, can dig, can bore, can follow closely, engrave milling, slot, carve, it is adaptable to timber structure room, decorations, furniture floor, load-bearing knot Structure material automobile, container floor etc..

7, the oriented wood chipboard obtained it is prepared by the method for the present invention, with product specification 2440 × 1220 × 15(mm), hold Support plate material, measures under the conditions of drying regime, and its burst size of methanal is 0.114～0.116 mg/ m³, the quiet Qu Qiang of parallel direction Degree is 31～40 MPa, and parallel flexible modulus is 4605～4776 MPa；Vertical spring modulus is 1501～1770MPa, 24 h Thickness swelling rate is 10%～18%, has the water resistance of excellence, and vertical nail-holding ability is up to 89009N, dimensional stability and Good reliability, is understood its mechanical property every and expansion character by above-mentioned data and burst size of methanal is superior to standard.Further, The oriented wood chipboard that the inventive method prepares also has the heat resistance of excellence, irradiates or long at high temperature, high-strength ultraviolet Time ultraviolet irradiates lower without the situation that substantially ftractures, and reduces economic loss.

Detailed description of the invention

Embodiment 1

5) the qualified dry wood shavings of watch core layer transport through transporter, deliver in glue mixer, use machinery after the metering of chip metering feed bin Formula glue mixing carries out applying glue respectively to top layer and sandwich layer, and top layer applies isocyanates wood powder end composite adhesive, and resin added is 4%, resin added is on the basis of over dry glue is to the mass ratio of over dry wood shavings, and sandwich layer applies high temperature resistant composite urea formaldehyde resin adhesive, executes Dosage is 3%, and applied amount is on the basis of over dry glue is to the mass ratio of over dry wood shavings；

7) particle mat being carried out precompressed, the pressure of precompressed is 0.8MPa, time 8min；Finally carry out hot pressing, hot pressing pressure Power 2.5MPa, temperature is 210 DEG C, and hot pressing time is every millimeter of thickness of slab 80s～85s, then delivers in balance storehouse quenched, prepares Particieboard substrate；

8) the particieboard substrate of step 7) being carried out coarse sand sanding, sand falls 0.8-1.5 millimeter；Then by the particieboard base after coarse sand Plate carries out fine sand sanding, and sand falls 0.5-0.8 millimeter, obtains sanding substrate；It is combined toward sanding substrate coating isocyanates wood powder end Adhesive, the poplar decoration panel that patch 8mm is thick, obtain poplar skin thick china, be that 13 MPa carry out colding pressing 2 hours in pressure of colding pressing After, utilize hot pressing pressure machine to carry out hot-forming, hot pressing pressure 15MPa, temperature is 120 DEG C, and last fine sand polishes, and saws limit, point Choosing packing, obtains high temperature resistant oriented wood chipboard.

Above-mentioned steps 5) and step 8) described in isocyanates wood powder end composite adhesive, be with isocyanates for this Body, will add isocyanates to through the wood powder end of processing according to 10% that wood powder end addition is isocyanate weight In, after stirring, form uniform isocyanates wood powder end composite adhesive.

Cyanurotriamide modified urea resin 50 parts；

Oxytarch 20 parts；

Polyvinyl alcohol 1 part；

Hydrogenated rosin 3 parts；

Propanediol polyoxypropylene polyvinylether 2 parts；

Polyisocyanate 4 parts；

Isobutyl triethoxy silane 0.5 part；

Phenolate lignin 5 parts；

100 parts of clear water；

Flake asbestos 1 part；

Mica powder 1 part.

The production method of above-mentioned high temperature resistant composite urea formaldehyde resin: first the clear water of parts by weight is put in reactor, heating To 80 DEG C, it is subsequently adding the hydrogenated rosin of parts by weight, isobutyl triethoxy silane and propanediol polyoxypropylene polyvinylether, Stir 30 minutes, add the polyvinyl alcohol of parts by weight, phenolate lignin, be allowed to dissolve, add the trimerization of parts by weight Cyanamide modified urea-formaldehyde resin, Oxytarch, flake asbestos and mica powder, keep 80 DEG C of stirring reactions 5 hours, 10-20 before use Minute add parts by weight polyisocyanate, mixing and stirring can use.

Embodiment 2

5) the qualified dry wood shavings of watch core layer transport through transporter, deliver in glue mixer, use machinery after the metering of chip metering feed bin Formula glue mixing carries out applying glue respectively to top layer and sandwich layer, and top layer applies isocyanates wood powder end composite adhesive, and resin added is 6%, resin added is on the basis of over dry glue is to the mass ratio of over dry wood shavings, and sandwich layer applies high temperature resistant composite urea formaldehyde resin adhesive, executes Dosage is 5%, and applied amount is on the basis of over dry glue is to the mass ratio of over dry wood shavings；

7) particle mat being carried out precompressed, the pressure of precompressed is 0.8MPa, time 7min；Finally carry out hot pressing, hot pressing pressure Power 2.8MPa, temperature is 205 DEG C, and hot pressing time is every millimeter of thickness of slab 80s～85s, then delivers in balance storehouse quenched, prepares Particieboard substrate；

8) the particieboard substrate of step 7) being carried out coarse sand sanding, sand falls 0.8-1.5 millimeter；Then by the particieboard base after coarse sand Plate carries out fine sand sanding, and sand falls 0.5-0.8 millimeter, obtains sanding substrate；It is combined toward sanding substrate coating isocyanates wood powder end Adhesive, the poplar decoration panel that patch 8mm is thick, obtain poplar skin thick china, be after 14MPa carries out colding pressing 2 hours in pressure of colding pressing, Utilizing hot pressing pressure machine to carry out hot-forming, hot pressing pressure 18MPa, temperature is 115 DEG C, and last fine sand polishes, and saws limit, and sorting is beaten Bag, obtains high temperature resistant oriented wood chipboard.

Above-mentioned steps 5) and step 8) described in isocyanates wood powder end composite adhesive, be with isocyanates for this Body, will add isocyanates to through the wood powder end of processing according to 15% that wood powder end addition is isocyanate weight In, after stirring, form uniform isocyanates wood powder end composite adhesive.

Cyanurotriamide modified urea resin 80 parts；

Oxytarch 25 parts；

Polyvinyl alcohol 2 parts；

Hydrogenated rosin 5 parts；

Propanediol polyoxypropylene polyvinylether 2.5 parts；

Polyisocyanate 5 parts；

Isobutyl triethoxy silane 3 parts；

Phenolate lignin 8 parts；

150 parts of clear water；

Mica powder 2 parts；

Titanium dioxide powder 2 parts.

The production method of above-mentioned high temperature resistant composite urea formaldehyde resin: first the clear water of parts by weight is put in reactor, heating To 90 DEG C, it is subsequently adding the hydrogenated rosin of parts by weight, isobutyl triethoxy silane and propanediol polyoxypropylene polyvinylether, Stir 20 minutes, add the polyvinyl alcohol of parts by weight, phenolate lignin, be allowed to dissolve, add the trimerization of parts by weight Cyanamide modified urea-formaldehyde resin, Oxytarch, mica powder and titanium dioxide powder, keep 85 DEG C of stirring reactions 3 hours, before use The polyisocyanate adding parts by weight in 10-20 minute, mixing and stirring can use.

Embodiment 3

5) the qualified dry wood shavings of watch core layer transport through transporter, deliver in glue mixer, use machinery after the metering of chip metering feed bin Formula glue mixing carries out applying glue respectively to top layer and sandwich layer, and top layer applies isocyanates wood powder end composite adhesive, and resin added is 8%, resin added is on the basis of over dry glue is to the mass ratio of over dry wood shavings, and sandwich layer applies high temperature resistant composite urea formaldehyde resin adhesive, executes Dosage is 6%, and applied amount is on the basis of over dry glue is to the mass ratio of over dry wood shavings；

7) particle mat being carried out precompressed, the pressure of precompressed is 0.9MPa, time 5min；Finally carry out hot pressing, hot pressing pressure Power 3MPa, temperature is 210 DEG C, and hot pressing time is every millimeter of thickness of slab 80s～85s, then delivers in balance storehouse quenched, prepares plane Card substrate；

8) the particieboard substrate of step 7) being carried out coarse sand sanding, sand falls 0.8-1.5 millimeter；Then by the particieboard base after coarse sand Plate carries out fine sand sanding, and sand falls 0.5-0.8 millimeter, obtains sanding substrate；It is combined toward sanding substrate coating isocyanates wood powder end Adhesive, the poplar decoration panel that patch 8mm is thick, obtain poplar skin thick china, be that 15 MPa carry out colding pressing 2 hours in pressure of colding pressing After, utilize hot pressing pressure machine to carry out hot-forming, hot pressing pressure 20MPa, temperature is 120 DEG C, and last fine sand polishes, and saws limit, point Choosing packing, obtains high temperature resistant oriented wood chipboard.

Above-mentioned steps 5) and step 8) described in isocyanates wood powder end composite adhesive, be with isocyanates for this Body, will add isocyanates to through the wood powder end of processing according to 20% that wood powder end addition is isocyanate weight In, after stirring, form uniform isocyanates wood powder end composite adhesive.

Cyanurotriamide modified urea resin 100 parts；

Oxytarch 30 parts；

Polyvinyl alcohol 3 parts；

Hydrogenated rosin 8 parts；

Propanediol polyoxypropylene polyvinylether 3 parts；

Polyisocyanate 6 parts；

Isobutyl triethoxy silane 5 parts；

Phenolate lignin 10 parts；

200 parts of clear water；

Titanium dioxide powder 5 parts.

The production method of above-mentioned high temperature resistant composite urea formaldehyde resin: first the clear water of parts by weight is put in reactor, heating To 100 DEG C, it is subsequently adding the hydrogenated rosin of parts by weight, isobutyl triethoxy silane and propanediol polyoxypropylene polyethylene Ether, stirs 10 minutes, adds the polyvinyl alcohol of parts by weight, phenolate lignin, be allowed to dissolve, add the three of parts by weight Poly cyanamid modified urea-formaldehyde resin, Oxytarch and titanium dioxide powder, keep 90 DEG C of stirring reactions 2 hours, and 10-20 divides before use Clock adds the polyisocyanate of parts by weight, and mixing and stirring can use.

Comparative example 3

The method that full Eucalyptus leftover pieces produce oriented wood chipboard, comprises the steps:

5) the qualified dry wood shavings of watch core layer transport through transporter, deliver in glue mixer, use machinery after the metering of chip metering feed bin Formula glue mixing carries out applying glue respectively to top layer and sandwich layer, and top layer applies isocyanates wood powder end composite adhesive, and resin added is 8%, resin added is on the basis of over dry glue is to the mass ratio of over dry wood shavings, and sandwich layer applies urea-formaldehyde resin adhesive (purchased from Zibo Hua Sen Binding agent company limited), applied amount is 6%, and applied amount is on the basis of over dry glue is to the mass ratio of over dry wood shavings；

8) the particieboard substrate of step 7) being carried out coarse sand sanding, sand falls 0.8-1.5 millimeter；Then by the particieboard base after coarse sand Plate carries out fine sand sanding, and sand falls 0.5-0.8 millimeter, obtains sanding substrate；It is combined toward sanding substrate coating isocyanates wood powder end Adhesive, the poplar decoration panel that patch 8mm is thick, obtain poplar skin thick china, be that 15 MPa carry out colding pressing 2 hours in pressure of colding pressing After, utilize hot pressing pressure machine to carry out hot-forming, hot pressing pressure 20MPa, temperature is 120 DEG C, and last fine sand polishes, and saws limit, point Choosing packing, obtains oriented wood chipboard.

According to LY/T1580-2000 " oriented wood chipboard " products obtained therefrom (drying regime in embodiment and contrast are implemented Under the conditions of carry sheet material) relevant mechanical property be measured, the product specification of embodiment and comparative example is 2440 × 1220 × 15(mm), the mensuration of burst size of methanal is according to 1m³Climate box method is carried out by GB 18580 regulation；Test specimen is from constant temperature and humidity After case takes out, being the most vertically placed in the water that temperature is 20 DEG C ± 2 DEG C immersion 72h ± 1 h, then test specimen is at-12 DEG C to-20 DEG C Refrigerator freezes 24h ± 0.25h, puts into temperature 70 C ± 1 DEG C drying baker after frost and be dried 72h ± 1 h, after three circulate Carry out the mensuration of MOR；Elastic modelling quantity is measured according to the regulation of GB/T 17657；Measure according to the regulation of GB/T 17657 Vertical nail-holding ability；Measure 24 h thickness swelling rates according to the regulation of GB/T 17657, at a temperature of testing at 300 DEG C, observe The deformation of oriented wood chipboard and cracking situation.Each Product checking three times, data are averaged, every testing result such as following table Shown in:

From the data of above-described embodiment 1-3, it is prepared by the method for the present invention the oriented wood chipboard obtained, with product specification 2440 × 1220 × 15(mm), carry sheet material, measure under the conditions of drying regime, its burst size of methanal is 0.114～0.116 mg/ m³, the MOR of parallel direction is 31～40 MPa, and parallel flexible modulus is 4605～4776 MPa；Vertical spring modulus Being 1501～1770MPa, 24 h thickness swelling rates are 10%～18%, have the water resistance of excellence, and vertical nail-holding ability is high Reach 89009N, dimensional stability and good reliability, above-mentioned data understand its mechanical property every and expansion character and formaldehyde Burst size is superior to standard.

From the data of comparative example 3, its burst size of methanal 0.345 mg/ m³The peak of the standard of being significantly larger than 0.124 mg/ m³, MOR, 24 h thickness swelling rates, elastic modelling quantity (parallel), elastic modelling quantity (vertically) and vertical These several mechanical properties of nail-holding ability and standard difference are little, but at a temperature of testing at 300 DEG C, oriented wood chipboard serious cracking, Deformation is big, high temperature resistant out of condition.

Therefore, by upper table is found out, during producing high temperature resistant oriented wood chipboard by the method for the present invention, this Bright high temperature resistant composite urea formaldehyde resin and isocyanates wood powder end composite adhesive produce high temperature resistant oriented wood chipboard relative to Oriented wood chipboard prepared by common urea-formaldehyde resin adhesive and isocyanates wood powder end composite adhesive has prominent advantage, It is mainly manifested in: the high temperature resistant oriented wood chipboard that the method for the present invention produces has Stability Analysis of Structures, is unlikely to deform, and water resistance is excellent Different, stability and the feature of good reliability；Also have excellent resistance to elevated temperatures, there is preferable application and popularization value.

Claims

1. the method that full Eucalyptus leftover pieces produce high temperature resistant oriented wood chipboard, it is characterised in that: comprise the steps:

The leftover pieces of above-described production Eucalyptus plate be make many Eucalyptus laminate after rotary-cut Eucalyptus plate during unavailable Waste material；

2) wet wood shavings are dried in roller drier delivered to by transporter, and the moisture content controlling wood shavings is 3.0%-5.0%；

The method of described separation veneer uses winnower, and in winnower, veneer is blown off owing to proportion is less, and veneer can Using the fuel as air stove；Separate metal and sandstone uses gravity sieve extension set；

4) wood shavings through being dried are done at the watch core layer of 5-20 millimeter at 50-80 millimeter and width by screening and sorting, length Wood shavings are sent to watch core layer dry wood shavings material transitional storehouse by transporter and store, and length is more than 80 millimeters and the width wood shavings more than 20 millimeters After again shearing, it is sent to watch core layer dry wood shavings material transitional storehouse store；

Full Eucalyptus leftover pieces the most according to claim 1 produce the method for high temperature resistant oriented wood chipboard, it is characterised in that: step Rapid 5) the isocyanates wood powder end composite adhesive and described in step 8), is with isocyanates as body, according to wood powder end Addition is that the wood powder end passing through processing is added in isocyanates by the 10-20% of isocyanate weight, stirs After, form uniform isocyanates wood powder end composite adhesive.

Full Eucalyptus leftover pieces the most according to claim 2 produce the method for high temperature resistant oriented wood chipboard, it is characterised in that: institute The course of processing at the wood powder end stated is: by the wood shavings that length in wood chip shear history is less than 50 millimeters and width is less than 5 millimeters Grinding to form wood powder end, controlling its particle diameter is 0.1-3 micron, and is dried at wood powder end to moisture content less than less than 3%.

Full Eucalyptus leftover pieces the most according to claim 1 produce the method for high temperature resistant oriented wood chipboard, it is characterised in that: step Rapid 5) the high temperature resistant composite urea formaldehyde resin adhesive described in, is made up of the raw material of following parts by weight:

Cyanurotriamide modified urea resin 50～100 parts；

Oxytarch 20～30 parts；

Polyvinyl alcohol 1～3 parts；

Hydrogenated rosin 3～8 parts；

Propanediol polyoxypropylene polyvinylether 2～3 parts；

Polyisocyanate 4～6 parts；

Isobutyl triethoxy silane 0.5～5 parts；

Phenolate lignin 5～10 parts；

Clear water 100～200 parts；

High temperature resistant filler 2～5 parts.

Full Eucalyptus leftover pieces the most according to claim 4 produce the method for high temperature resistant oriented wood chipboard, it is characterised in that: institute The high temperature resistant filler stated is the one in flake asbestos, mica powder and titanium dioxide powder or a combination thereof thing.

Full Eucalyptus leftover pieces the most according to claim 4 produce the method for high temperature resistant oriented wood chipboard, it is characterised in that on: State the production method of high temperature resistant composite urea formaldehyde resin: be first put in reactor by the clear water of parts by weight, be heated to 80-100 DEG C, It is subsequently adding the hydrogenated rosin of parts by weight, isobutyl triethoxy silane and propanediol polyoxypropylene polyvinylether, stirs 10 Minute to 30 minutes, add the polyvinyl alcohol of parts by weight, phenolate lignin, be allowed to dissolve, add the three of parts by weight Poly cyanamid modified urea-formaldehyde resin, Oxytarch and high temperature resistant filler, keep 80-90 DEG C of stirring reaction 2-5 hour, before use The polyisocyanate adding parts by weight in 10-20 minute, mixing and stirring can use.