CN103433984B - Producing method of heat-resisting full eucalyptus laminated veneer - Google Patents

Producing method of heat-resisting full eucalyptus laminated veneer Download PDF

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CN103433984B
CN103433984B CN201310353332.3A CN201310353332A CN103433984B CN 103433984 B CN103433984 B CN 103433984B CN 201310353332 A CN201310353332 A CN 201310353332A CN 103433984 B CN103433984 B CN 103433984B
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temperature
hot pressing
formaldehyde
time
pressing
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CN103433984A (en
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肖文飞
王飞虎
邱金城
农志军
李同雨
欧阳先明
谢高专
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GUANGXI NANNING LUYUAN BEILIN WOOD INDUSTRY Co Ltd
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    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02PCLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P20/00Technologies relating to chemical industry
    • Y02P20/10Process efficiency
    • Y02P20/133Renewable energy sources, e.g. sunlight

Abstract

The invention relates to a producing method of a heat-resisting full eucalyptus laminated veneer. An artificial board is formed through high-temperature pressing and pasting melamine gummed paper and a substrate formed by multilayer eucalyptus single boards through adhesive bonding, and the producing method comprises the steps of single board sorting, gumming, cold pressing, hot pressing, stacking health maintenance and melamine gummed paper pasting. The producing method is characterized in that three-time cold pressing, three-time hot pressing, twice constant -temperature-room standing health maintenance and twice heat radiation health maintenance are adopted; the cold pressing temperature is room temperature, the cold pressing pressure is 0.5 to 0.8MPa, and the hot pressing pressure is 0.8 to 1.0MPa; the temperature of the first hot pressing is 115 to 120 DEG C; the temperature of the second hot pressing is 110 to 115 DEG C, and the temperature of the third hot pressing is 120 to 125 DEG C; the temperature of the constant-temperature-room standing health maintenance is 60 to 80 DEG C, and the time is 5 to 8 hours; the heat radiation health maintenance adopts the mode that the constant-temperature -room is cooled to the room temperature through natural ventilation, and the time is 3 to 4 hours.

Description

The working system of heat-resisting full Eucalyptus lamination decoration panel
Technical field
The present invention relates to a kind of Wood-based Panel Production method, particularly a kind of manufacture method of heat-resisting full Eucalyptus lamination decoration panel.
Background technology
Eucalyptus is the general designation that Myrtaceae Myrtaceae eucalyptus belongs to Eucalyptus plant, and eucalyptus strong adaptability also can grow in dead soil, and fast growth, nursing cost is low, and therefore cultivated area increases year by year.Eucalyptus Wood is red, glossy, without special odor, texture is staggered, structure is close, material is firmly heavy, flexible.Level larger eucalyptus in footpath is by being peeled into veneer, glued board or laminated veneer lumber is produced as central layer, and small diameter grade, brush wood or the eucalyptus that is difficult to rotary-cut are processed into wood chip, for papermaking or producd fibers plate, therefore the comprehensive utilization ratio of eucalyptus can be increased to more than 90%.China successfully developed high-performance Eucalyptus recombinant material, Eucalyptus laminated veneer lumber, bamboo eucalyptus matrix material, thick core eucalyptus composite plate made from solid wood and without aldehyde Eucalyptus plywood making technology etc. in recent years, and Eucalyptus is more and more universal in the application of wood-based plate.
Eucalyptus structure is close, material is hard, after Eucalyptus the laminated veneer lumber easy delamination, particularly life-time service of making or the moisture absorption, easily plays drum.The climate temperature in southern summer is high, high humidity, and Eucalyptus wood-based plate absorbs moisture, easy dilatational strain.The method addressed this is that at present is the resin added increasing unit surface, to improve Eucalyptus bonding force between layers.But resin added increases, and burst size of methanal is difficult to the burst size of methanal standard reaching national requirements.Adopt without aldehyde sizing agent, cost is difficult to again accept.
Summary of the invention
The object of this invention is to provide a kind of heat-resisting full Eucalyptus lamination decoration panel, can life-time service and nonhygroscopic distortion under the environment of high-temperature high-humidity for a long time, the present invention discloses the production method of this full Eucalyptus lamination decoration panel equally, being solved drum problem on the one hand, is reduce burst size of methanal on the one hand.
Technical scheme of the present invention is as follows:
In the production process of base material, adopt cold pressing for three times, three hot pressing, twice thermostatic chamber leave standstill health and overcome bulging phenomenon with the method for heat radiation health.Concrete production technique is as follows:
Manually select Eucalyptus veneer of the same size, coat above-mentioned sizing agent, resin added is generally 200 ~ 300g/m 2, assembly (3 ~ 15 layers), first time colds pressing, and temperature is normal temperature, and pressure is 0.5 ~ 0.8MPa, first time hot pressing, and temperature is 115 ~ 120 DEG C, and pressure is 0.8 ~ 1.0MPa; 60 ~ 80 DEG C of thermostatic chambers leave standstill health 5 ~ 8 hours, the naturally ventilated cooling of thermostatic chamber, heat radiation health 3 ~ 4h; Second time is colded pressing, and temperature is normal temperature, and pressure is 0.5 ~ 0.8MPa, second time hot pressing, and temperature is 110 ~ 115 DEG C, and pressure is 0.8 ~ 1.0MPa; Second time thermostatic chamber leaves standstill health, and thermostatic chamber temperature is 60 ~ 80 DEG C, time 90 ~ 120min, the naturally ventilated cooling of thermostatic chamber, heat radiation health 3 ~ 4h; Third time colds pressing, and temperature is normal temperature, and pressure is 0.5 ~ 0.8MPa, third time hot pressing, temperature is 120 ~ 125 DEG C, and pressure is 0.8 ~ 1.0MPa, determine thick with coarse sand and fine sandpaper polishing, paste low face side, polishing face side, face side sticks trimeric cyanamide gum dipped paper, hot pressing, and temperature is 120 DEG C, pressure is 1.5MPa, heat radiation arranges, and beats limit, obtains heat-resisting full Eucalyptus lamination decoration panel.
Reduce the burst size of formaldehyde, first will from improvement adhesive-preparing technology, by improving adhesive-preparing technology, making raw material formaldehyde almost or complete reaction, reducing the residual quantity of formaldehyde.The employing of this adhesive-preparing technology is disposable adds formaldehyde, adds urea at twice, and the method for a trimeric cyanamide promotes the complete reaction of formaldehyde.Formaldehyde is added in reactor, be 2 ~ 2.5 by formic acid adjust ph, add the polyvinyl alcohol of formaldehyde weight 0.5 ~ 0.6%, add the urea of formaldehyde weight 10%, be warming up to 50 DEG C, insulation reaction 30min, the pH value regulating reaction solution is 8 ~ 8.5, add the urea of formaldehyde weight 25%, add the trimeric cyanamide of formaldehyde weight 1%, be warming up to 90 ~ 95 DEG C, insulation reaction 90min, reaction terminates rear inspection, if also containing formaldehyde, add appropriate urea or trimeric cyanamide continuation reaction, until detect the content < 5mg/L of formaldehyde, adding alkali regulates the pH value of reaction end liquid to be 7.2 ~ 7.5.Amino generation polycondensation on aldehyde radical on formaldehyde molecule and urea or melamine molecule, generate macromolecular compound, along with constantly carrying out of condensation reaction, the molecular weight of the material that polycondensation generates constantly increases, reaction solution viscosity is caused to increase, mobility is deteriorated, reduce the probability of the collision of formaldehyde and the urea do not reacted, and the superpolymer embedding formaldehyde generated and urea, cause the formaldehyde outside superpolymer and urea effectively internally not to supplement, cause the inner polymericular weight generated low.Polymericular weight is low, easily degrades, release formaldehyde.Therefore the one-step technology before, namely disposablely adds formaldehyde and urea, and easily cause reaction in early stage violent, embedding phenomenon is very serious.So-called embedding phenomenon is exactly in polyreaction, generate high molecular polymer encase polymerization single polymerization monomer, the also polymerization reaction take place of the monomer inside high molecular polymer, but due to outside monomer cannot give the inside reaction supplement, therefore, the polymericular weight that wraps of high molecular polymer is very little.The polymer substance molecular weight distribution that this phenomenon causes polyreaction to obtain is very wide, and level of residual monomers is very large.Because single stage method reaction in early stage is violent, reaction polymericular weight in early stage is very large, and later stage molecular weight is little, the formaldehyde of non-complete reaction is many, the sizing agent molecular weight distribution made is very wide, the artificial board formaldehyde burst size made with this sizing agent is very large, and high risks user's is healthy.Added the novel process of urea by gradation, avoid reaction in early stage too violent, the polymericular weight of reacting generation after adding urea for the first time can not be very large, because the amount that first time adds urea is little, the polymkeric substance generated is few, and viscosity is low, the good fluidity of material, do not have the phenomenon of embedding, therefore the molecular weight distribution of polymkeric substance is comparatively even, and second time adds urea, because the concentration of formaldehyde in reaction solution has reduced much, reaction is also relatively more steady, and it is not very serious for therefore embedding phenomenon.
Formaldehyde is complete reaction almost, molecular weight of polycondensates narrowly distributing, and molecular weight is high, difficult degradation, and as the sizing agent of veneer, burst size of methanal is naturally low.
The positively effect that the present invention produces is:
1. office furniture of the present invention adopt by full Eucalyptus lamination decoration panel production technique cold pressing for three times, three hot pressing, twice thermostatic chamber leaves standstill the production technique of health and twice heat radiation health, the stress of Eucalyptus intralamellar part can be eliminated, expand with heat and contract with cold after avoiding finished product to be heated to act on and hold the generation of yielding situation, and reduce the possibility that finished product meets water, the moisture absorption plays drum, is out of shape.Use the technique in the present invention, finished product burst size of methanal can also be reduced, protect the health of human consumer.
2. office furniture of the present invention is the technique adopting gradation to add urea with the urea-formaldehyde resin adhesive that full Eucalyptus lamination decoration panel adopts, formaldehyde monomers less residue, in conjunction with the repeatedly cold, hot pressure technique that the present invention adopts, the burst size of methanal of finished product is less, more environmental protection.
Embodiment
Embodiment 1
First sizing agent is prepared: add formaldehyde in a kettle., be 2 ~ 2.5 by formic acid adjust ph, add the polyvinyl alcohol of formaldehyde weight 0.5 ~ 0.6%, add the urea of formaldehyde weight 10%, be warming up to 50 DEG C, insulation reaction 30min, the pH value regulating reaction solution is 8 ~ 8.5, add the urea of formaldehyde weight 25%, add the trimeric cyanamide of formaldehyde weight 1%, be warming up to 90 ~ 95 DEG C, insulation reaction 90min, reaction terminates rear inspection, if also containing formaldehyde, add appropriate urea or trimeric cyanamide continuation reaction, until detect the content < 5mg/L of formaldehyde, adding alkali regulates the pH value of reaction end liquid to be 7.2 ~ 7.5.
Manually select Eucalyptus veneer of the same size, coat above-mentioned sizing agent, resin added is 300g/ ㎡, assembly 5 layers, and first time colds pressing, and temperature is normal temperature, and pressure is 0.5MPa, first time hot pressing, and temperature is 115 ~ 120 DEG C, and pressure is 0.8MPa; 60 ~ 80 DEG C of thermostatic chambers leave standstill health 5 ~ 8 hours, the naturally ventilated cooling of thermostatic chamber, heat radiation health 3 ~ 4h; Second time is colded pressing, and temperature is normal temperature, and pressure is 0.5MPa, second time hot pressing, and temperature is 110 ~ 115 DEG C, and pressure is 0.8MPa; Second time thermostatic chamber leaves standstill health, and thermostatic chamber temperature is 60 ~ 80 DEG C, time 90 ~ 120min, the naturally ventilated cooling of thermostatic chamber, heat radiation health 3 ~ 4h; Third time colds pressing, and temperature is normal temperature, and pressure is 0.5MPa, third time hot pressing, temperature is 120 ~ 125 DEG C, and pressure is 0.8MPa, determine thick with coarse sand and fine sandpaper polishing, paste low face side, polishing face side, face side sticks trimeric cyanamide gum dipped paper, hot pressing, and temperature is 120 DEG C, pressure is 1.5MPa, heat radiation arranges, and beats limit, obtains heat-resisting full Eucalyptus lamination decoration panel.
Embodiment 2
Manually select Eucalyptus veneer of the same size, coat the sizing agent of embodiment 1, resin added is 250g/ ㎡, assembly (7 layers), and first time colds pressing, and temperature is normal temperature, and pressure is 0.65MPa, first time hot pressing, and temperature is 115 ~ 120 DEG C, and pressure is 0.9MPa; 60 ~ 80 DEG C of thermostatic chambers leave standstill health 5 ~ 8 hours, the naturally ventilated cooling of thermostatic chamber, heat radiation health 3 ~ 4h; Second time is colded pressing, and temperature is normal temperature, and pressure is 0.65MPa, second time hot pressing, and temperature is 110 ~ 115 DEG C, and pressure is 0.9MPa; Second time thermostatic chamber leaves standstill health, and thermostatic chamber temperature is 60 ~ 80 DEG C, time 90 ~ 120min, the naturally ventilated cooling of thermostatic chamber, heat radiation health 3 ~ 4h; Third time colds pressing, and temperature is normal temperature, and pressure is 0.65MPa, third time hot pressing, temperature is 120 ~ 125 DEG C, and pressure is 0.9MPa, determine thick with coarse sand and fine sandpaper polishing, paste low face side, polishing face side, face side sticks trimeric cyanamide gum dipped paper, hot pressing, and temperature is 120 DEG C, pressure is 1.5MPa, heat radiation arranges, and beats limit, obtains heat-resisting full Eucalyptus lamination decoration panel.
Embodiment 3
Manually select Eucalyptus veneer of the same size, coat the sizing agent of embodiment 1, resin added is 200g/ ㎡, assembly (9 layers), and first time colds pressing, and temperature is normal temperature, and pressure is 0.8MPa, first time hot pressing, and temperature is 115 ~ 120 DEG C, and pressure is 1.0MPa; 60 ~ 80 DEG C of thermostatic chambers leave standstill health 5 ~ 8 hours, the naturally ventilated cooling of thermostatic chamber, heat radiation health 3 ~ 4h; Second time is colded pressing, and temperature is normal temperature, and pressure is 0.8MPa, second time hot pressing, and temperature is 110 ~ 115 DEG C, and pressure is 1.0MPa; Second time thermostatic chamber leaves standstill health, and thermostatic chamber temperature is 60 ~ 80 DEG C, time 90 ~ 120min, the naturally ventilated cooling of thermostatic chamber, heat radiation health 3 ~ 4h; Third time colds pressing, and temperature is normal temperature, and pressure is 0.8MPa, third time hot pressing, temperature is 120 ~ 125 DEG C, and pressure is 1.0MPa, determine thick with coarse sand and fine sandpaper polishing, paste low face side, polishing face side, face side sticks trimeric cyanamide gum dipped paper, hot pressing, and temperature is 120 DEG C, pressure is 1.5MPa, heat radiation arranges, and beats limit, obtains heat-resisting full Eucalyptus lamination decoration panel.
comparative example 1
Manually select Eucalyptus veneer of the same size, coat the sizing agent of embodiment 1, resin added is 300g/ ㎡, and assembly (11 layers), colds pressing, and temperature is normal temperature, and pressure is 2MPa, hot pressing, and temperature is 120 ~ 125 DEG C, and pressure is 3MPa; 60 ~ 80 DEG C of thermostatic chambers leave standstill health 5 ~ 8 hours, the naturally ventilated cooling of thermostatic chamber, heat radiation health 3 ~ 4h; Determine thick with coarse sand and fine sandpaper polishing, paste low face side, polishing face side, face side sticks trimeric cyanamide gum dipped paper, hot pressing, and temperature is 160 DEG C, and pressure is 1.5MPa, and heat radiation arranges, and beats limit, obtains heat-resisting full Eucalyptus lamination decoration panel.
comparative example 2
Manually select Eucalyptus veneer of the same size, coat the sizing agent of embodiment 1, resin added is 300g/ ㎡, assembly (11 layers), and first time colds pressing, and temperature is normal temperature, and pressure is 1.5MPa, first time hot pressing, and temperature is 115 ~ 120 DEG C, and pressure is 2.0MPa; 60 ~ 80 DEG C of thermostatic chambers leave standstill health 5 ~ 8 hours, the naturally ventilated cooling of thermostatic chamber, heat radiation health 3 ~ 4h; Second time is colded pressing, and temperature is normal temperature, and pressure is 1.5MPa, second time hot pressing, and temperature is 110 ~ 115 DEG C, and pressure is 2.0MPa; Second time thermostatic chamber leaves standstill health, and thermostatic chamber temperature is 60 ~ 80 DEG C, time 90 ~ 120min, the naturally ventilated cooling of thermostatic chamber, heat radiation health 3 ~ 4h; Determine thick with coarse sand and fine sandpaper polishing, paste low face side, polishing face side, face side sticks trimeric cyanamide gum dipped paper, hot pressing, and temperature is 160 DEG C, and pressure is 1.5MPa, and heat radiation arranges, and beats limit, obtains heat-resisting full Eucalyptus lamination decoration panel.
comparative example 3
Manually select Eucalyptus veneer of the same size, coat that market is bought or that ordinary process is produced urea-formaldehyde resin adhesive, resin added is 200g/ ㎡, assembly (9 layers), first time colds pressing, and temperature is normal temperature, and pressure is 0.8MPa, first time hot pressing, temperature is 115 ~ 120 DEG C, and pressure is 1.0MPa; 60 ~ 80 DEG C of thermostatic chambers leave standstill health 5 ~ 8 hours, the naturally ventilated cooling of thermostatic chamber, heat radiation health 3 ~ 4h; Second time is colded pressing, and temperature is normal temperature, and pressure is 0.8MPa, second time hot pressing, and temperature is 110 ~ 115 DEG C, and pressure is 1.0MPa; Second time thermostatic chamber leaves standstill health, and thermostatic chamber temperature is 60 ~ 80 DEG C, time 90 ~ 120min, the naturally ventilated cooling of thermostatic chamber, heat radiation health 3 ~ 4h; Third time colds pressing, and temperature is normal temperature, and pressure is 0.8MPa, third time hot pressing, temperature is 120 ~ 125 DEG C, and pressure is 1.0MPa, determine thick with coarse sand and fine sandpaper polishing, paste low face side, polishing face side, face side sticks trimeric cyanamide gum dipped paper, hot pressing, and temperature is 120 DEG C, pressure is 1.5MPa, heat radiation arranges, and beats limit, obtains heat-resisting full Eucalyptus lamination decoration panel.
According to GB18580-2001 " in indoor decorating and refurnishing materials wood-based plate and goods thereof burst size of methanal limitation ", the burst size of methanal of products obtained therefrom in embodiment is measured; According to GB/T9846---the bonding strength of method to embodiment products obtained therefrom detected in 2004 " glued boards " measures; The mensuration playing drum phenomenon of wood-based plate adopts water-boiling method, namely wood-based plate is cut out as 80cm(length) × 30cm(is wide) specification, the thermostat(t)ed water putting into 80 DEG C soaks, record wood-based plate plays the drum time used, and the time is longer, illustrates that the quality of wood-based plate is better, under normal circumstances uses, more difficult drum.Each embodiment products obtained therefrom detects three times, and data are averaged, and every detected result is as shown in the table:
It can be seen from the table, heat-resisting full Eucalyptus lamination decoration panel of the present invention adopt cold pressing for three times, three hot pressing, the production technique that twice thermostatic chamber leaves standstill health and twice heat radiation health can improve the bonding strength of wood-based plate, reduce burst size of methanal, because reduce the stress that full Eucalyptus lamination decoration panel inside produces, also easily can not be out of shape even if wood-based plate expands with heat and contract with cold because being heated, improve the thermotolerance of wood-based plate; The reduction of burst size of methanal is except outside the Pass having with production technique; also relevant with the production technique of urea-formaldehyde resin adhesive; therefore the production technique and employing Wood-based Panel Production technique of the present invention of improving urea-formaldehyde resin adhesive is only had; the burst size of methanal of wood-based plate could be reduced to greatest extent, protection living environment.Heat-resisting full Eucalyptus lamination decoration panel good heat resistance of the present invention, can under high humidity, hot environment life-time service, be adapted at southern area use.

Claims (2)

1. the production method of heat-resisting full Eucalyptus lamination decoration panel, the base material that this heat-resisting full Eucalyptus lamination decoration panel is bondd by sizing agent by multilayer Eucalyptus veneer and trimeric cyanamide gum dipped paper high temperature overlay and form, comprise veneer sorting, gluing, cold pressing, hot pressing, stacking health and paste trimeric cyanamide gum dipped paper step, it is characterized in that: adopt and cold pressing for three times and three hot pressing, twice thermostatic chamber leaves standstill health and twice heat radiation health; Described temperature of colding pressing is room temperature, and pressure is 0.5 ~ 0.8MPa, and hot pressing pressure is 0.8 ~ 1.0MPa; The temperature of first time hot pressing is 115 ~ 120 DEG C; The temperature of second time hot pressing is 110 ~ 115 DEG C, and the temperature of third time hot pressing is 120 ~ 125 DEG C; It is 60 ~ 80 DEG C that described thermostatic chamber leaves standstill health temperature, and the time is 5 ~ 8h; Described heat radiation health is that thermostatic chamber natural ventilation is cooled to room temperature, and the time is 3 ~ 4h; The temperature of base material pasting trimeric cyanamide gum dipped paper is 120 DEG C, and pressure is 1.5Mpa;
The production technique of described sizing agent is as follows: adhesive-preparing technology employing is disposable adds formaldehyde, adds urea at twice, and the method for a trimeric cyanamide promotes the complete reaction of formaldehyde, add formaldehyde in a kettle., be 2 ~ 2.5 by formic acid adjust ph, add the polyvinyl alcohol of formaldehyde weight 0.5 ~ 0.6%, add the urea of formaldehyde weight 10%, be warming up to 50 DEG C, insulation reaction 30min, the pH value regulating reaction solution is 8 ~ 8.5, add the urea of formaldehyde weight 25%, add the trimeric cyanamide of formaldehyde weight 1%, be warming up to 90 ~ 95 DEG C, insulation reaction 90min, reaction terminates rear inspection, if also containing formaldehyde, add appropriate urea or trimeric cyanamide continuation reaction, until detect the content < 5mg/L of formaldehyde, adding alkali regulates the pH value of reaction end liquid to be 7.2 ~ 7.5.
2. the heat-resisting full Eucalyptus lamination decoration panel obtained by production method according to claim 1.
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CN104760107B (en) * 2015-03-30 2017-03-08 广西宾阳县荣良新材料科技有限公司 A kind of scavenger reduces the production method of solid wooden compound floor formaldehyde

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