CN100551649C - The preparation method of E0 level plywood - Google Patents
The preparation method of E0 level plywood Download PDFInfo
- Publication number
- CN100551649C CN100551649C CNB2008100244693A CN200810024469A CN100551649C CN 100551649 C CN100551649 C CN 100551649C CN B2008100244693 A CNB2008100244693 A CN B2008100244693A CN 200810024469 A CN200810024469 A CN 200810024469A CN 100551649 C CN100551649 C CN 100551649C
- Authority
- CN
- China
- Prior art keywords
- urea
- formaldehyde
- preparation
- melamine
- add
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Landscapes
- Adhesives Or Adhesive Processes (AREA)
- Chemical And Physical Treatments For Wood And The Like (AREA)
- Phenolic Resins Or Amino Resins (AREA)
Abstract
The invention provides a kind of preparation method of E0 level plywood, the preparation technology of used urea-formaldehyde resin adhesive is simple, and repeatability is good, and cost is lower, and storage period is long.With the glued board (three-ply board, thick china and multi-layer sheet) that this glue is suppressed, bonding strength and burst size of methanal meet the requirement of E0 level plywood.Alkali-Acid-Base traditional handicraft is adopted in the preparation of the used Lauxite of the present invention, selected urea and melamine add in three batches, the urea gradation adds can play the effect that the molecular resin quality is regulated, especially for the second time the urea that adds, not only can degrade and reset big molecular moiety in the molecule, but also can reduce the wherein content of ehter bond, reduce the burst size of formaldehyde.The pH value of strict control polycondensation phase in building-up process, the method with the two-stage polycondensation can be carried out polycondensation reaction in order fast.
Description
Technical field
The present invention relates to a kind of preparation method of E0 level plywood, relate in particular to a kind of preparation method of cyanurotriamide modified urea resin glue system E0 level plywood.
Background technology
Urea aldehyde (UF) resin raw material is abundant, and is cheap, and wood fibre is have good adhesive force, has good cohesive strength, the wood-based plate of making has certain water proof bonding strength, handles and uses easily, thereby account for more than 70% of the used resin glue of wood-based panel industry.But the UF resin glue has the sensitiveness two big shortcomings of poor water resistance and burst size formaldehyde, and formaldehyde is harmful to health, is considered to possible carcinogen.
The resistance to water of improving Lauxite with melamine is the most frequently used effective ways.Melamine and urea all belong to aminated compounds, and melamine has six active groups, can generate melamine methylol with the formaldehyde addition reaction, promoted the crosslinked of Lauxite, form tridimensional network, seal many water imbibition groups simultaneously, improved the resistance to water of Lauxite greatly.The patent of this respect has comprised CN1834186, CN1616510 etc.
Many countries all make stipulations to the concentration of formaldehyde that environment allows, and then the burst size of methanal of wood-based plate has been made strict regulation.The various countries, Europe have just popularized E in the nineties in 20th century
1The production of level wood-based panel industry.For satisfying the market demands of low burst size of methanal wood-based plate, it is that glue is used for plywood production with the starch adhesive and the aqueous high molecular carbimide adhesive non-formaldehyde such as (API) of modification that the people is arranged.As a kind of preparation method with starch-base timber adhesive of good water resistance is provided among the CN100999651, the CN1982395 disclosure of the Invention cation branched-chain starch wood binder and preparation method, SY0800410102599.6 has proposed a kind of method that adopts the isocyanate resin spraying and glue blending to glue woody sheet material or the like, though the modified starch adhesive cost is low, the sheet material burst size of methanal of producing is low, but bonding strength is poor, do not meet the national standard requirement, the glued board burst size of methanal that API glue is made is low, intensity also can be up to standard, but cost costliness, moreover it is big to produce benzene type organic toxicity in the making sheet process, is difficult to produce in enormous quantities.
More scientific and technical personnel are devoted to the optimization of Modified UF resin glue prescription and technology, in the glue process, add various auxiliary agents, stabilizing agent, add suitable formaldehyde trapping agent during impregnation, optimize pressing plate technology or the wood-based plate of making is carried out the aldehydes removal post processing, CN1632025 has invented a kind of under the prerequisite that does not change formaldehyde resin and Wood-based Panel Production technology, invent the catalyst of development by using, can make the burst size of methanal of wood-based plate be reduced to E0 or FC
0Level.CN1570275 has invented the manufacture method of the compound high medium density fibre board (MDF) of a kind of environment-friendly type vegetation.With the plain plate of high medium density fibre board (MDF) after the hot pressing by hollow airtight the aldehyde process chamber falls, fall the aldehyde process chamber and feed ammonia, can be prepared into E by physics and chemical action
1The high medium density fibre board (MDF) of/E0 level environment-friendly type.CN1526528 has invented a kind of E
1The manufacture method of/E0 level environment friendly artificial board is more than or equal to E with free formaldehyde release
2The plain plate of level is handled with the ammonia vacuum method then, makes the burst size of methanal of sheet material reach E
1/ E0 level.Domestic at present directly with behind melamine～urea～formaldehyde resin adhesive pressing plate and do not do any technology that the aldehyde processing just can reach the E0 level of falling, almost also do not have.
Summary of the invention
Technical problem: the invention provides a kind of preparation method of E0 level plywood, the preparation technology of used urea-formaldehyde resin adhesive is simple, and repeatability is good, and cost is lower, and storage period is long.With the glued board (three-ply board, thick china and multi-layer sheet) that this glue is suppressed, bonding strength and burst size of methanal meet the requirement of E0 level plywood.
Technical scheme: a kind of preparation method of E0 level plywood, it is characterized in that preparation process is: the first step: the Lauxite of preparation low content of free formaldehyde: 1): with formalin, the polyvinyl alcohol that accounts for formaldehyde quality 0.5～1.5%, first melamine that accounts for formaldehyde quality 2～3%, and first urea add reactor, adjust pH to 7.0～9.0, be warming up to 80 ℃～95 ℃, reaction 20～90min, the mol ratio of above-mentioned urea and melamine integral molar quantity and formaldehyde is 1: 2.0～2.2; 2): the pH value of step 1) gained solution is transferred to 5.0～5.4, and 80～95 ℃ are reacted to cloud point; 3): with step 2) the pH value of gained solution transfers to 6.5～6.9, the melamine that adds second batch of urea and second batch and the same quality of step 1), the urea that accumulative total adds and the mol ratio of melamine integral molar quantity and formaldehyde are 1: 1.48～1.54,80～90 ℃ reaction 30～70min; 4): the pH value of step 3) gained solution is transferred to 7.5～8.0, add the 3rd batch of melamine that accounts for initial formaldehyde quality 9～11%, 80-90 ℃ of reaction 20～80min; 5): add the 3rd batch of urea, and the urea that adds of accumulative total and the mol ratio of melamine integral molar quantity and formaldehyde be 1: 0.9～1.1, continue to react 20～80min, cooling discharging; Second step: will made Lauxite and account for the flour of Lauxite quality 15～25%, 5～15% formaldehyde trapping agent, the curing agent of 1-2%, 0.8～1.5% isocyanates and mix, and with the epoxy glue that stirs by 280～320g/m
2Be evenly coated on the veneer, and under 0.8～1.2MPa, 105～115 ℃ of conditions, press the time compacting glued board of 1min/mm thickness of slab.The adjust pH agents useful for same is triethanolamine, NaOH or potassium hydroxide in the first step; Formic acid, acetate, hydrochloric acid or ammonium chloride.Described formaldehyde trapping agent is the porous mineral material.Described curing agent is NH
4Cl and (NH
4)
2S
2O
8, (NH
4)
2HPO
4, H
3PO
4, the bi-component curative systems that constitutes of oxalic acid, tartaric acid or formic acid.Veneer is poplar, linden or weedtree.Described bi-component curative systems is: NH
4Cl and (NH
4)
2S
2O
8, NH
4Cl and (NH
4)
2HPO
4, NH
4Cl and H
3PO
4, NH
4Cl and oxalic acid, NH
4Cl and tartaric acid or NH
4Cl and formic acid.
Beneficial effect: alkali-Acid-Base traditional handicraft is adopted in the preparation of the used Lauxite of the present invention, selected urea and melamine add in three batches, the urea gradation adds can play the effect that the molecular resin quality is regulated, especially for the second time the urea that adds, not only can degrade and reset big molecular moiety in the molecule, but also can reduce the wherein content of ehter bond, reduce the burst size of formaldehyde.The pH value of strict control polycondensation phase in building-up process, the method with the two-stage polycondensation can be carried out polycondensation reaction in order fast.Adopt alkali stage to add first urea and melamine, the triazine ring of melamine has six active groups, thereby the reactivity height, can shorten acid polycondensation reaction time 1～2h.The melamine methylol that generates enters on the main chain backbone of UMF resin by polycondensation reaction, has introduced the melamine molecule of polyfunctionality, has improved the crosslinking degree of resin, and favourable it is further crosslinked, has strengthened the glue performance of sheet material, improves bonding strength.The methyl ether chain that polycondensation produces between melamine methylol is comparatively stable, methylene ether chain unlike condensation between the methylolurea, easily decompose and emit formaldehyde, thereby add and cyanurotriamide modifiedly not only can improve the burst size of methanal that bonding strength can also reduce wood-based plate.
The present invention adds polyvinyl alcohol in the initial reaction stage of the preparation of Lauxite, polyvinyl alcohol and formaldehyde react under acid condition and generate polyvinyl formal, improved the structure of Lauxite, also reduce the content of the free methylol of hydrophilic radical in the Lauxite, improved the resistance to water of Lauxite.And the polyvinyl formal strand embeds in the macromolecular chain of Lauxite, introduce flexibility ehter bond preferably, synthetic resin molecule chain flexibility and original viscosity have been improved, improved the fragility of resin, resin can be stretched along with the variation of stress within the specific limits, reduce the influence of stress, improved the bonding strength of resin resinoid bond intensity.The adding of polyvinyl formal had simultaneously both suppressed between urea and formaldehyde to play the microcapsules effect again because of reacting the too drastic insoluble methylene urea white precipitate that generates, and prolonged the bin stability of resin.
The mol ratio of the present invention F/U in the preparation of Lauxite is lower, and added the melamine of certain mass and adopt in the low temperature synthesis technique further promoted the abundant reaction of formaldehyde, so the free formaldehyde in institute's synthetic resin is very low, is low toxic and environment-friendly type Lauxite.And melamine adds quality less than 9.0% of UMF resin gross mass, so the glue cost is lower.
Among the present invention during impregnation added curing agent be the bi-component curing agent, mainly be by NH
4Cl and acid curing agent constitute, and adopt the bi-component curing agent than NH
4Cl, (NH
4)
2SO
4Etc. traditional single curing agent more superiority is arranged, not only can reduce the pH value of resin glue with composite curing system, improve the curing rate and the bonding strength of colding pressing, improve prefabricating condition, but also can make low F/U mol ratio UF resin solidification complete, bonding strength improves, and can reduce the burst size of methanal of sheet material.We are 1.03 and 1.01 UMF resin to F/ (U+M) mol ratio, add NH respectively
4Cl and H
3PO
4, oxalic acid, tartaric acid, formic acid compacting poplar three-ply board, detect bonding strength and burst size of methanal.Respectively these two kinds of UMF resins are added NH then
4Cl and H
3PO
4, the bi-component curative systems that constitutes of oxalic acid, tartaric acid, formic acid, compacting poplar three-ply board detects bonding strength and burst size of methanal.And pH value, the curing rate that adds various single curing agents and bi-component curing agent and the bonding strength of colding pressing compared.Result of the test is seen attached list.
Used formaldehyde trapping agent is the porous type mineral material among the present invention, can absorb the formaldehyde that resin discharges in hot pressing, and the glue performance of raising resin that can be appropriate, can reduce the burst size of methanal of plate, improve the bonding strength of plate, and the price of this formaldehyde trapping agent is lower, can reduce the cost of plate.
The present invention adds isocyanates when impregnation because its molecule two ends contain active group, can with-OH ,-NH-,-NH
2Deng functional group reactions.When Lauxite solidifies, in isocyanates and the resin-CH
2OH ,-NH-reaction, generates firm ammonia ester bond and allophanic acid ester bond, improved the crosslinking degree of resin, the while can also with the hydroxyl reaction in the lumber fibre, thereby reach the purpose of raising glue performance.And the bridged bond of these formation and methylol, methylene ether link are different, they are being heated and quite stable during hydrolysis, can not decompose and emit formaldehyde gas, the adding of isocyanates can become stable bridged bond with unsettled groups converted in the urea-formaldehyde resin adhesive, thereby has significantly reduced burst size of methanal.In an embodiment in the preparation of three-ply board and thick china because the glue-line of three-ply board and thick china thereof is less, spread is less, consider cost, when impregnation, do not add isocyanates, and multiple-plate glue-line is many, total spread is big, so need also need add isocyanates except adding formaldehyde trapping agent when impregnation.
The preparation technology of Lauxite is simple among the present invention, and repeatability is good.The degree of polymerization of the resin that is synthesized is moderate, and the viscosity of resin is lower, and contained amino in the condensation polymer, imino group are less, the good stability of resin, and storage period is long.Place 7～10 days burst size of methanal promptly less than 0.5mg/L behind the three-ply board with the resin compacting of being synthesized, do not need to pass through any aldehyde post processing of falling, simple to operate.
The specific embodiment
Embodiment 1 (preparation three-ply board)
The first step: in the 500ml four-hole boiling flask, add 320g formalin, first melamine 7g, reach first urea 108g adding reactor, with triethanolamine adjust pH to 7.5, be warming up to 85 ℃, reaction 40min.
Second step: the formic acid with 50% transfers to 4.8,90 ℃ of reactions to required viscosity with the pH value.
The 3rd step: with triethanolamine the pH value is transferred to 6.5, add second crowd of melamine 7g and second crowd of urea 42g, 90 ℃ of reaction 50min.
The 4th step: with triethanolamine the pH value is transferred to 7.5, add the 3rd crowd of melamine 35g, 80 ℃ of reaction 40min.
The 5th step: be cooled to 70 ℃, add the 3rd crowd of urea 55g, 50 ℃ are continued reaction 30min, cooling discharging.Test its performance respectively, the results are shown in subordinate list 1,
The 6th step: get made Lauxite 60g, add the flour that accounts for Lauxite quality 25%, 10% formaldehyde trapping agent, 1% NH
4Cl and 0.5% H
3PO
4For curing agent stirs evenly.
The 7th step: with the epoxy glue that stirs evenly by 280g/m
2Be evenly coated on the veneer, and under 1.0～1.2MPa, 105 ℃ of conditions, press the time compacting three-ply board of 1min/mm thickness of slab.Test result sees attached list 2.
Embodiment 2 (preparation three-ply board)
The first step: in the 500ml four-hole boiling flask, add 320g formalin, first melamine 8g, reach first urea 108g adding reactor, with triethanolamine adjust pH to 8.0, be warming up to 85 ℃, reaction 50min.
Second step: the formic acid with 50% transfers to 5.2,90 ℃ of reactions to required viscosity with the pH value.
The 3rd step: with triethanolamine the pH value is transferred to 6.7, add second crowd of melamine 8g and second crowd of urea 42g, 90 ℃ of reaction 50min.
The 4th step: with triethanolamine the pH value is transferred to 8.0, add the 3rd crowd of melamine 33g, 90 ℃ of reaction 40min.
The 5th step: be cooled to 70 ℃, add the 3rd crowd of urea 60g, 55 ℃ are continued reaction 30min, cooling discharging.Test its performance respectively, the results are shown in subordinate list 1,
The 6th step: get made Lauxite 60g, add the flour that accounts for Lauxite quality 20%, 10% formaldehyde trapping agent, 1% NH
4Cl and 0.5% H
3PO
4For curing agent stirs evenly.
The 7th step: with the epoxy glue that stirs evenly by 300g/m
2Be evenly coated on the veneer, and under 1.0～1.2MPa, 110 ℃ of conditions, press the time of 1min/mm thickness of slab and press the compacting three-ply board.Test result sees attached list 2.
Embodiment 3 (preparation three-ply board)
The first step: in the 500ml four-hole boiling flask, add 320g formalin, first melamine 9g, reach first urea 108g adding reactor, with triethanolamine adjust pH to 8.5, be warming up to 90 ℃, reaction 40～50min.
Second step: the formic acid with 50% transfers to 5.5,90 ℃ of reactions to required viscosity with the pH value.
The 3rd step: with triethanolamine pH value is transferred to 6.2, add second crowd of melamine and second crowd of urea 42g with the same quality of the first step, 90 ℃ are reacted 50min.
The 4th step: with triethanolamine the pH value is transferred to 8.0, add the 3rd crowd of melamine 32g, 90 ℃ of reaction 40min.
The 5th step: be cooled to 70 ℃, add the 3rd crowd of urea 63g, 60 ℃ are continued reaction 20min, cooling discharging.Test its performance respectively, the results are shown in subordinate list 1.
The 6th step: get made Lauxite 60g, add the flour that accounts for Lauxite quality 15%, 15% formaldehyde trapping agent, 1% NH
4Cl and 0.5% H
3PO
4For curing agent stirs evenly.
The 7th step: with the epoxy glue that stirs evenly by 320g/m
2Be evenly coated on the veneer, and under 1.2MPa, 115 ℃ of conditions, press the time of 1min/mm thickness of slab and press the compacting three-ply board.Test result sees attached list 2.
Embodiment 4 (preparation three-ply board)
The first step: in the 500ml four-hole boiling flask, add 320g formalin, first melamine 8g, reach first urea 108g adding reactor, with triethanolamine adjust pH to 7.5～8.5, be warming up to 80 ℃～90 ℃, reaction 40～50min.
Second step: the formic acid with 50% transfers to 5.5,90 ℃ of reactions to required viscosity with the pH value.
The 3rd step: with triethanolamine the pH value is transferred to 6.5～6.9, add second crowd of melamine 8g and second crowd of urea 42g, 90 ℃ of reaction 50min.
The 4th step: with triethanolamine the pH value is transferred to 7.5～8.0, add the 3rd crowd of melamine 33g, 80-90 ℃ of reaction 40min.
The 5th step: be cooled to 70 ℃, add the 3rd crowd of urea 66g, 50～60 ℃ are continued reaction 40min, cooling discharging.Test its performance respectively, the results are shown in subordinate list 1.
The 6th step: get made Lauxite 60g, add the flour that accounts for Lauxite quality 20%, 10% formaldehyde trapping agent, 1% NH
4Cl and 0.5% H
3PO
4For curing agent stirs evenly.
The 7th step: with the epoxy glue that stirs evenly by 280～320g/m
2Be evenly coated on the veneer, and under 1.2MPa, 105～115 ℃ of conditions, press the time of 1min/mm thickness of slab and press the compacting three-ply board.Test result sees attached list 2.
Embodiment 5 (preparation three-ply board)
The first step: in the 2t reactor, add 1280kg formalin, 14.6kg polyvinyl alcohol, first melamine 32kg, reach first urea 430kg adding reactor, with triethanolamine adjust pH to 7.5～8.0, be warming up to 80 ℃～90 ℃, reaction 40～50min.
Second step: the formic acid with 50% transfers to 5.0～5.4 with the pH value, and 90 ℃ of reactions are to required viscosity.
The 3rd step: with triethanolamine the pH value is transferred to 6.5～6.9, add second crowd of melamine 32g and second crowd of urea 170kg, 90 ℃ of reaction 50min.
The 4th step: with triethanolamine the pH value is transferred to 7.5～8.0, add the 3rd batch and account for melamine 132kg, 80～90 ℃ of reaction 40min.
The 5th step: be cooled to 70 ℃, add the 3rd crowd of urea 240kg, 50～60 ℃ are continued reaction 30min, cooling discharging.Test its performance respectively, the results are shown in subordinate list 1.
The 6th step: get made Lauxite and add the flour that accounts for Lauxite quality 20%, 10% formaldehyde trapping agent, 1% NH
4Cl and 0.5% H
3PO
4For curing agent stirs evenly.
The 7th step: with the epoxy glue that stirs evenly by 300～320g/m
2Be evenly coated on the veneer, and under 1.0MPa, 110～115 ℃ of conditions, press the time compacting three-ply board of 1min/mm thickness of slab.Test result sees attached list 2.
Embodiment 6 (preparation thick china)
The first step: in the 3t reactor, add 1800kg formalin, 10kg polyvinyl alcohol, first melamine 45kg, reach first urea 600kg adding reactor, with triethanolamine adjust pH to 7.5～8.0, be warming up to 80 ℃～90 ℃, reaction 40～50min.
Second step: the formic acid with 50% transfers to 5.0～5.4 with the pH value, and 90 ℃ of reactions are to required viscosity.
The 3rd step: with triethanolamine the pH value is transferred to 6.5～6.9, add second crowd of melamine 45kg and second crowd of urea 240kg, 90 ℃ of reaction 50min.
The 4th step: with triethanolamine the pH value is transferred to 7.5～8.0, add the 3rd crowd of melamine 185kg, 80-90 ℃ of reaction 40min.
The 5th step: be cooled to 70 ℃, add the 3rd crowd of urea 336kg, 50～60 ℃ are continued reaction 30min, cooling discharging.Test its performance respectively, the results are shown in subordinate list 1,
The 6th step: get made Lauxite and add the flour that accounts for Lauxite quality 20%, 10% formaldehyde trapping agent, 1% NH
4Cl and 0.5% H
3PO
4For curing agent stirs evenly.
The 7th step: with the epoxy glue that stirs evenly by 280～300g/m
2Be evenly coated on the veneer, and under 1.2MPa, 105～115 ℃ of conditions, press the time of 1min/mm thickness of slab and press the compacting three-ply board.And behind the scratch brushing with the three-ply board suppressed, coat masking agent, display 5-7 days after, by above-mentioned spread gluing, and press down the system thick china in same pressing plate condition.Test result sees attached list 2.
Embodiment 7 (preparation multi-layer sheet)
The first step: adopt 6 glues of embodiment and add the flour that accounts for Lauxite quality 20%, 10% formaldehyde trapping agent, 1% isocyanates, 1% NH
4Cl and 0.5% H
3PO
4For curing agent stirs evenly.
Second step: with the epoxy glue that stirs evenly by 280～300g/m
2Be evenly coated on the veneer, and under 1.0MPa, 105～110 ℃ of conditions, suppress 5 laminates by the time of 1min/mm thickness of slab.Test result sees attached list 2.
Embodiment 8 (preparation three-ply board)
Adopt 1 glue of embodiment, NH with 1%
4Cl is the curing agent pressing plate, and test result sees attached list 2.
Embodiment 9 (preparation three-ply board)
Adopt 2 glues of embodiment, NH with 1%
4Cl is the curing agent pressing plate, and test result sees attached list 2.
Embodiment 10 (preparation three-ply board)
Adopt 1 glue of embodiment, the isocyanates with 1%, 1% NH
4Cl and 0.5% H
3PO
4Be the curing agent pressing plate, test result sees attached list 2.
Subordinate list 1:E0 level plywood muf resin glue technical indicator
| Free aldehyde % | Viscosity mp.s | Admittedly contain % | Curing rate S | The storage life sky | |
| Embodiment 1 | 0.11 | 62 | 55.45 | 220 | ＞30 |
| Embodiment 2 | 0.09 | 48 | 56.35 | 315 | ＞30 |
| Embodiment 3 | 0.068 | 145 | 56.6 | 208 | ＞30 |
| Embodiment 4 | 0.067 | 103 | 56.3 | 202 | ＞30 |
| Embodiment 5 | 0.083 | 385 | 55.4 | 206 | ＞20 |
| Embodiment 6 | 0.062 | 320 | 56.0 | 196 | ＞20 |
Subordinate list 2: pressing plate test result
Annotate: Strength of Plywood is 14 test specimen testing results in the subordinate list 2, and molecule is average bonding strength, and denominator is minimum intensity～maximum intensity.
The different curative systems compacting of subordinate list 3:UMF glue poplar three-ply board result of the test
4 two kinds of UMF resins of the subordinate list pH value and curing rate of different curing system
Subordinate list 5 different curing system add two kinds of UMF resins gummed result that colds pressing
The detection of above-mentioned UMF resin: 3.5 regulations that solids content is pressed GB/T14074-2006 detect; 3.3 regulations that viscosity is pressed GB/T14074-2006 detect; 3.7 regulations of pressing GB/T14074-2006 hardening time detect; Free formaldehyde is pressed 3.16 of GB/T14074-2006 and is detected.
The detection of glued board: the glued board room temperature of compacting is placed after 5～7 days and is detected.Bonding strength is pressed 4.15 regulation detections among the GB/T17657-1999; Burst size of methanal detects by 4.12 drier methods among the GB/T17657-1999.
Claims (5)
1. the preparation method of an E0 level plywood is characterized in that preparation process is:
The first step: the Lauxite of preparation low content of free formaldehyde:
1): with formalin, the polyvinyl alcohol that accounts for formaldehyde quality 0.5～1.5%, first melamine that accounts for formaldehyde quality 2～3%, and first urea add reactor, adjust pH to 7.0～9.0, be warming up to 80 ℃～95 ℃, reaction 20～90min, the mol ratio of above-mentioned urea and melamine integral molar quantity and formaldehyde is 1: 2.0～2.2;
2): the pH value of step 1) gained solution is transferred to 4.8～5.5, and 80～95 ℃ are reacted to cloud point;
3): with step 2) the pH value of gained solution transfers to 6.2～6.9, the melamine that adds second batch of urea and second batch and the same quality of step 1), the urea that accumulative total adds and the mol ratio of melamine integral molar quantity and formaldehyde are 1: 1.48～1.54,80～90 ℃ reaction 30～70min;
4): the pH value of step 3) gained solution is transferred to 7.5～8.0, add the 3rd batch of melamine that accounts for initial formaldehyde quality 9～11%, 80～90 ℃ of reaction 20～80min;
5): add the 3rd batch of urea, and the urea that adds of accumulative total and the mol ratio of melamine integral molar quantity and formaldehyde be 1: 0.9～1.1, continue to react 20～80min, cooling discharging;
Second step: will made Lauxite and account for the flour of Lauxite quality 15～25%, 10～15% formaldehyde trapping agent, 1～2% curing agent, 0.8～1.5% isocyanates and mix, and with the epoxy glue that stirs by 280～320g/m
2Be evenly coated on the veneer, and under 1.0～1.2MPa, 105～115 ℃ of conditions, press the time compacting glued board of 1min/mm thickness of slab.
2. the preparation method of E0 level plywood according to claim 1 is characterized in that the adjust pH agents useful for same is triethanolamine, NaOH or potassium hydroxide in the first step; Formic acid, acetate, hydrochloric acid or ammonium chloride.
3. the preparation method of E0 level plywood according to claim 1 is characterized in that described formaldehyde trapping agent is the porous mineral material.
4. the preparation method of E0 level plywood according to claim 1 is characterized in that described curing agent is NH
4C1 and (NH
4) X
2S
2O
8, (NH
4)
2HPO
4, H
3PO
4, the bi-component curative systems that constitutes of oxalic acid, tartaric acid or formic acid.
5. the preparation method of E0 level plywood according to claim 1 is characterized in that described veneer is poplar, linden or weedtree.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2008100244693A CN100551649C (en) | 2008-03-21 | 2008-03-21 | The preparation method of E0 level plywood |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2008100244693A CN100551649C (en) | 2008-03-21 | 2008-03-21 | The preparation method of E0 level plywood |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101244571A CN101244571A (en) | 2008-08-20 |
| CN100551649C true CN100551649C (en) | 2009-10-21 |
Family
ID=39945356
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2008100244693A Expired - Fee Related CN100551649C (en) | 2008-03-21 | 2008-03-21 | The preparation method of E0 level plywood |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN100551649C (en) |
Families Citing this family (32)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101481593B (en) * | 2009-01-14 | 2012-02-01 | 中国林业科学研究院林产化学工业研究所 | Preparation of urea-melamine-formaldehyde resin adhesive for E0-grade floor |
| CN101979455B (en) * | 2010-10-15 | 2015-04-01 | 蔡正文 | Urea-formaldehyde glue and preparation method thereof |
| CN101987881B (en) * | 2010-10-15 | 2011-09-21 | 钱彤 | Method for synthesizing urea-formaldehyde resin |
| CN102060967A (en) * | 2010-12-01 | 2011-05-18 | 刘有志 | Preparation method of melamin resin for impregnating wood grain paper |
| CN102391805B (en) * | 2011-07-18 | 2013-09-04 | 广西大学 | Modified urea-formaldehyde resin adhesive for concrete formwork and production method of adhesive |
| CN102605929B (en) * | 2012-03-14 | 2014-02-26 | 广州厚邦木业制造有限公司 | Manual multi-layer solid wood floor and production process thereof |
| CN102634310B (en) * | 2012-04-21 | 2013-11-13 | 安徽肯帝亚皖华人造板有限公司 | Preparation method of urea formaldehyde resin adhesive |
| CN102766424B (en) * | 2012-08-06 | 2014-06-11 | 广东始兴县华洲木业有限公司 | Preparation method of environment-friendly moistureproof glue |
| CN102977826B (en) * | 2012-12-04 | 2014-03-26 | 广西华峰林业集团股份有限公司 | E1 grade environment-friendly moisture-proof urea-formaldehyde resin adhesive for medium-density fiberboards |
| CN103101100A (en) * | 2012-12-28 | 2013-05-15 | 廊坊华日家具股份有限公司 | Environment friendly recombination bamboo artificial board and manufacturing method thereof |
| RU2534550C1 (en) * | 2013-04-25 | 2014-11-27 | Вячеслав Ефимович Цветков | Method of production of urea-formaldehyde oligomer |
| CN103433984B (en) * | 2013-08-14 | 2015-04-29 | 广西南宁绿园北林木业有限公司 | Producing method of heat-resisting full eucalyptus laminated veneer |
| CN103496025B (en) * | 2013-09-26 | 2015-11-25 | 广西三威林产工业有限公司 | The manufacture method of ultra-low formaldehyde emission medium-to-high density fiberboard |
| CN103540283A (en) * | 2013-10-18 | 2014-01-29 | 巫溪县迪纳木业有限公司 | Urea-formaldehyde glue adhesive and preparation method thereof |
| CN103756608B (en) * | 2013-12-18 | 2015-09-30 | 上海东和胶粘剂有限公司 | A kind of High frequency heating tackiness agent |
| CN104086730B (en) * | 2014-07-28 | 2016-04-27 | 广西大学 | Prepare the two-step approach of environment friendly artificial board modified urea-formaldehyde glue |
| CN104762039A (en) * | 2015-04-30 | 2015-07-08 | 黄琳 | Adhesive for indoor plywood |
| CN105348465B (en) * | 2015-12-04 | 2017-09-26 | 广西南宁德源胶粘剂有限公司 | A kind of preparation method of E0 grades of cyanurotriamide modified urea resin |
| CN105348464B (en) * | 2015-12-20 | 2017-10-31 | 江西绿洲环保新材料股份有限公司 | The preparation method of environment-friendly modified urea-formaldehyde resin adhesive |
| CN106189967A (en) * | 2016-07-08 | 2016-12-07 | 安徽东平木业股份有限公司 | A kind of sheet material glue processing technology |
| CN106336840A (en) * | 2016-08-29 | 2017-01-18 | 南宁市创锦胶合板有限责任公司 | Anticorrosion compound urea resin and production method thereof |
| CN106244065A (en) * | 2016-08-29 | 2016-12-21 | 南宁市创锦胶合板有限责任公司 | Vermins-proof mildew-proof composite urea formaldehyde resin and production method thereof |
| CN106381108A (en) * | 2016-08-31 | 2017-02-08 | 广西玉麒木业股份有限公司 | Environment-friendly glue for sheet material and preparation method thereof |
| CN107033309A (en) * | 2017-03-28 | 2017-08-11 | 曾华 | A kind of preparation method of fiberboard adhesive |
| CN107325243B (en) * | 2017-08-16 | 2020-01-07 | 常熟理工学院 | Preparation method of environment-friendly urea-formaldehyde resin |
| CN107805479A (en) * | 2017-11-29 | 2018-03-16 | 柳州市鸿联木业有限公司 | Timber processing adhesive and preparation method thereof |
| CN108276540B (en) * | 2018-03-09 | 2019-06-11 | 东北林业大学 | A kind of melamine-urea cocondensation resin and preparation method thereof and a kind of adhesive |
| CN108795352A (en) * | 2018-07-18 | 2018-11-13 | 大连康能涂料有限公司 | A kind of preparation method of 0 grade of waterproof floor glue of new E |
| CN111303810B (en) * | 2020-04-07 | 2022-09-16 | 广州市长安粘胶制造有限公司 | Preparation method of E0-grade modified urea-formaldehyde resin for bent plate |
| CN114292610B (en) * | 2022-01-25 | 2023-10-27 | 山东百沃生物科技有限公司 | Carbohydrate derived adhesive, and preparation method and application thereof |
| CN116355563B (en) * | 2023-02-10 | 2023-11-10 | 河北枞柏木业有限公司 | Modified melamine adhesive and preparation method thereof |
| CN116478647B (en) * | 2023-04-20 | 2023-11-17 | 西南林业大学 | Preparation method of mixed resin for steam-induced-cured ENF-grade shaving board |
-
2008
- 2008-03-21 CN CNB2008100244693A patent/CN100551649C/en not_active Expired - Fee Related
Non-Patent Citations (4)
| Title |
|---|
| E0级胶合板用低成本UMF树脂胶的研制. 王春鹏，赵临五，卜洪忠，金立维，穆有炳，储富祥.林产工业，第2007年卷第6期. 2007 |
| E0级胶合板用低成本UMF树脂胶的研制. 王春鹏，赵临五，卜洪忠，金立维，穆有炳，储富祥.林产工业，第2007年卷第6期. 2007 * |
| E1级三聚氰胺改性脲醛树脂的制备与性能研究. 金立维，王春鹏，赵临五，刘奕，蒋煜.林产化学与工业，第25卷第1期. 2005 |
| E1级三聚氰胺改性脲醛树脂的制备与性能研究. 金立维，王春鹏，赵临五，刘奕，蒋煜.林产化学与工业，第25卷第1期. 2005 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101244571A (en) | 2008-08-20 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN100551649C (en) | The preparation method of E0 level plywood | |
| CN102086257B (en) | Environment-friendly urea resin for laminating plywoods from high water-content veneers and preparation and application thereof | |
| CN101550323A (en) | E0Preparation method of low-cost UMF resin adhesive for grade plywood | |
| US8372900B2 (en) | Cellulosic composite with binder comprising salt of inorganic acid | |
| CN101519483A (en) | Novel environment-friendly urea-formaldehyde resin and preparation method thereof | |
| CN101565492B (en) | Low toxic and environment-friendly urea-formaldehyde resin and preparation method thereof | |
| CN106883366B (en) | A kind of E0Grade cyanurotriamide modified urea resin adhesive | |
| CN102241826A (en) | Modified lignin and urea-formaldehyde resin synthesized from same and preparation methods of modified lignin and urea-formaldehyde resin | |
| Liu et al. | Free formaldehyde reduction in urea-formaldehyde resin adhesive: Modifier addition effect and physicochemical property characterization | |
| CN101121774A (en) | Method for preparing oxidization starch modified urea-formaldehyde resin | |
| CN102775571A (en) | Method for preparing melamine-urea-formaldehyde resin adhesives for outdoor plywood low in formaldehyde release | |
| CN101481593B (en) | Preparation of urea-melamine-formaldehyde resin adhesive for E0-grade floor | |
| CN102604021A (en) | Method for synthesizing urea-formaldehyde resin containing micro free formaldehyde for E0-level artificial boards | |
| CN102443369B (en) | Timber adhesive and preparation method thereof | |
| CN106883800A (en) | A kind of Resin adhesive and preparation method thereof | |
| AU595090B2 (en) | Amino resin and methods for its production | |
| EP0277926A2 (en) | A method for the production of amino resin | |
| CN103965425A (en) | Preparation method for water-glass modified amino resin | |
| CA2653337C (en) | Aminoplast resin of high performance for lignocellulosic materials | |
| CN102532447B (en) | Urea resin prepared by multilevel segmentation control, and continuous synthesis method | |
| JP7348999B1 (en) | Wooden board and its manufacturing method | |
| SK287450B6 (en) | Method for the preparation of board material | |
| CN113461888A (en) | Highly branched urea-polyamine-formaldehyde copolycondensation resin and preparation method thereof | |
| CN109824841A (en) | A kind of preparation method of the Abietyl modified urea-formaldehyde resin adhesive of methylol | |
| CN114751994B (en) | Acetylated oxidized starch and preparation method thereof, modified urea-formaldehyde resin adhesive and preparation method and application thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20091021 Termination date: 20160321 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |