CN101298520A - Urea-formaldehyde resin additive, preparation thereof and urea-formaldehyde resin adhesive - Google Patents
Urea-formaldehyde resin additive, preparation thereof and urea-formaldehyde resin adhesive Download PDFInfo
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Abstract
The invention provides a urea-formaldehyde resin additive used for a wood-based panel, a preparation method thereof as well as urea-formaldehyde resin containing the additive, and the additive contains glycol chemical modification treated wood flour, a water soluble macro molecular compound and inorganic mineral salt. The additive and the urea-formaldehyde resin are combined to be used in the invention, thus essentially reducing the formaldehyde release of the wood-based panel by chemical reaction with formaldehyde during the wood-based panel hot pressing process, furthermore, the mechanical property of the prepared wood-base panel is not decreased, but increased somehow. By fully utilizing the rejects of wood processing, wood flour-the main raw material of the additive of the invention - is low in price, thus saving resources, protecting environment, decreasing production cost and having important economic and social benefits.
Description
Technical field
The present invention relates to a kind of additive and preparation method thereof of tackiness agent and contain the tackiness agent of this additive, particularly a kind of wood-based plate is with the additive of urea formaldehyde resin adhesive and preparation method thereof and the urea-formaldehyde resin that contains this additive.
Background technology
Reform and opening-up is over 30 years, and the timber industry of China has obtained fast development.2006,1,270 hundred million yuan of China's wood-based plate output values, wood-based plate ultimate production 7428.56 ten thousand steres, wherein glued board 2728.78 ten thousand steres, core-board 1155 ten thousand steres.Wood-based plate ultimate production, glued board output, core-board output all rank first in the world.Only glued board, the annual tackiness agent that consumes of core-board are up to 5,000,000 tons (50% solids content).In glued board, core-board production process, often to add the flour of gross weight 20-30% in the tackiness agent as filler, to improve tackiness agent precompressed performance, enhance productivity, reduce the tackiness agent consumption, reduce production costs, prevent seep through and starved, improve the tackiness agent utilising efficiency, improve glue-line ageing-resistant performance etc., to consume ten thousand tons of whole meal flour 100-150 for this reason every year, amount to Renminbi 15-30 hundred million yuan.
Simultaneously, because what generally adopt in the Wood-based Panel Production is that formaldehyde is tackiness agent, particularly use urea-formaldehyde resin adhesive in a large number, therefore causing wood-based plate and goods (furniture, timber floor, indoor wooden decorative material etc.) thereof to exist formaldehyde and discharge problem, is the main source that formaldehyde pollutes in the room air pollution.
Along with the raising day by day of health of people consciousness, indoor environment consciousness, quality of life consciousness, artificial board formaldehyde discharges the polluted air, the problem that impairs one's health that cause and more and more is subject to people's attention.Formaldehyde has hormesis to eye, mucous membrane and respiratory tract, can cause chronic respiratory tract disease, allergic rhinitis, lower immune function etc.; Being considered to the potential carcinogenic substance, may be the inducement of rhinocarcinoma, laryngocarcinoma, skin carcinoma.According to statistics, the death toll that exceeds the quata that China is caused by room air pollution every year reaches 11.1 ten thousand people, several 220,000 person-times of the outpatient service that exceeds the quata, several 4,300,000 person-times of the emergency treatment that exceeds the quata.Solve artificial board formaldehyde release problem and arrived instant stage.
At present,, in tackiness agent, add flour as the tackiness agent filler, also have research to adopt solid wood wood powder and talcum powder to improve the precompressed performance of tackiness agent as the tackiness agent filler except generally adopting in order to improve tackiness agent precompressed performance.Publication number is that the application for a patent for invention of 101089109A discloses a kind of glue additive for artificial board, by weight percentage, is formed by the solid wood wood powder of 70-100% and the talcum powder mixing and stirring of 0-30%.The solid wood wood powder is in the water ratio 10%, crosses the solid wood wood powder of 260/300 mesh sieve; Talcum powder is that water ratio is in 10%, crosses the talcum powder of 325/400 mesh sieve.The solid wood wood powder can be substituted by bamboo, stalk and vegetable material powder.Talcum powder can be substituted by terra alba, lime powder and other mineral powder.Advantage such as adopt the wood-based plate of this additive manufacturing to have smoothly, not ftracture, do not subside, do not go mouldy, but the burst size of methanal of prepared wood-based plate is big, and environmental pollution is serious.
At present, the method for reduction artificial board formaldehyde burst size mainly contains: 1) adopt low mol ratio modified urea-formaldehyde resin adhesive; 2) adopt other environmental-protection type adhesives; 3) add formaldehyde-trapping agent at wood-based plate in urea-formaldehyde resin adhesive; 4) wood-based plate is carried out aftertreatment.But these technological methods all exist number of drawbacks.As, 1) though adopt low mol ratio modified urea-formaldehyde resin adhesive can effectively reduce the burst size of methanal of wood-based panel product, the bonding strength of product also often reduces, and can not meet the demands; Prolong set time, and production efficiency reduces; 2) adopt other environmental-protection type adhesives, as the isocyanates tackiness agent, cause the production cost of wood-based plate often to increase considerably, enterprise and user are difficult to accept; 3) add formaldehyde-trapping agent at wood-based plate in urea-formaldehyde resin adhesive,, often reduce the bonding strength of wood-based plate simultaneously though can effectively reduce the free formaldehyde in artificial plate burst size; Simultaneously, general formaldehyde-trapping agent price often is higher than urea-formaldehyde resin adhesive far away, its adding has just improved product cost, reduced product competitiveness, for example the FC-5 formaldehyde-trapping agent price of the big deer development Co., Ltd. of Japan production is 50000 yuan/ton, if add 1%-2% in glue, urea-formaldehyde resin cost then per ton will improve 500～1000 yuan; 4) wood-based plate is carried out aftertreatment, it as publication number the manufacturing process that discloses a kind of E1/E0 level environment friendly artificial board in the application for a patent for invention of CN1526528, adopt the ammonia vacuum method, publication number is to disclose a kind of treatment unit that reduces artificial board formaldehyde burst size in the utility model patent of CN2394770, and is bigger but finishing apparatus is often invested.
Summary of the invention
The objective of the invention is problem at above prior art existence, a kind of wood-based plate additive with urea-formaldehyde resin and preparation method thereof is provided, the additive that obtains is that a kind of modified wood powder and lime carbonate are the material of main composition, this additive can substitute conventional flour additive and join in the urea-formaldehyde resin, during the preparation wood-based plate, give tackiness agent good precompressed, can effectively reduce artificial board formaldehyde burst size simultaneously, guarantee the wood-based plate physical and mechanical property.
Another object of the present invention provides a kind of wood-based plate urea formaldehyde resin adhesive.
For realizing purpose of the present invention, one aspect of the present invention provides a kind of urea-formaldehyde resin additive, contains wood powder, water-soluble high-molecular compound and inorganic mineral salt.
Wherein, described wood powder is the wood powder through glycol-modified processing, and the weight part proportioning of the wood powder after the modification, water-soluble high-molecular compound and inorganic mineral salt is 100: 0.5-7: 50-500 is preferably 100: 1-5: 100-300.
Particularly, ethylene glycol is that mass percent concentration is the ethylene glycol solution of 5-15%, and the weight part proportioning of wood powder and ethylene glycol solution is 100: 20-40 is preferably 100: 30; Water-soluble high-molecular compound is one or more in polyacrylamide, polyvinyl alcohol, polyacrylic acid, the sodium polyacrylate; Inorganic mineral salt is selected one or more in lime carbonate, calcium sulfate, Calucium Silicate powder, Magnesium Silicate q-agent, the magnesiumcarbonate, is preferably lime carbonate.
Particularly, the ethylene glycol chemical modification is handled wood powder and is: ethylene glycol solution and wood powder are mixed the back under 100-150 ℃, carry out chemical reaction, temperature of reaction is preferably 110-130 ℃, and the reaction times is 1-3 hour; Then the modified wood powder behind the chemical reaction is carried out drying, drying temperature is 100-120 ℃, is preferably 105 ℃, and the water ratio of modified wood powder reaches 3-5%.
The present invention provides a kind of preparation method of urea-formaldehyde resin additive on the other hand, comprises the steps: 1) glycol-modified processing wood powder; 2) modified wood powder, water-soluble high-molecular compound and inorganic mineral salt are mixed.
Wherein, the ethylene glycol described in the step 1) is that mass percent concentration is the ethylene glycol solution of 5-15%, and the weight part proportioning of wood powder and ethylene glycol solution is 100: 20-40 is preferably 100: 30; Step 2) water-soluble high-molecular compound described in is selected from one or more in the polyacrylamide that can react with formaldehyde, polyvinyl alcohol, polyacrylic acid, the sodium polyacrylate; Described inorganic mineral salt is selected one or more in lime carbonate, calcium sulfate, Calucium Silicate powder, Magnesium Silicate q-agent, the magnesiumcarbonate, is preferably lime carbonate;
Particularly, the weight part proportioning of modified wood powder, water-soluble high-molecular compound and inorganic mineral salt is 100: 0.5-7: 50-500 is preferably 100: 1-5: 100-300.
Particularly, the spent glycol solution modification is handled wood powder for ethylene glycol solution and wood powder are mixed the back under 100-150 ℃, carries out chemical reaction, and temperature of reaction is preferably 110-130 ℃, and the reaction times is 1-3 hour; Then the modified wood powder behind the chemical reaction is carried out drying, drying temperature is 100-120 ℃, is preferably 105 ℃, makes the water ratio of modified wood powder reach 3-5%.
Particularly, the granularity of described wood powder is chosen as the 80-150 order, is preferably 100 orders; The granularity of described inorganic mineral salt is chosen as the 100-300 order, is preferably 200 orders.
Another aspect of the present invention provides a kind of urea formaldehyde resin adhesive, comprises urea-formaldehyde resin and above-mentioned described additive.
Wherein, the weight proportion of described additive and urea-formaldehyde resin is 15-40: 100, be preferably 20-30: 100.
The advantage applies of urea-formaldehyde resin additive of the present invention is in the following areas:
1, additive of the present invention and urea-formaldehyde resin adhesive have good mixing, can give urea-formaldehyde resin good precompressed, guarantee glued board, core-board production efficiency;
2, additive of the present invention is had an effect with formaldehyde in hot pressing of artificial board, fundamentally reduces artificial board formaldehyde burst size;
3, additive of the present invention mixes use with urea-formaldehyde resin adhesive, and the wood-based plate mechanical property of manufacturing not only can not reduce, and increases;
4, the manufacturing cost of additive of the present invention itself is utilized its substitute as flour well below flour, has therefore guaranteed that the manufacturing cost of wood-based plate can not improve, and has decreased;
5, additive main raw material wood powder of the present invention wide material sources not only are cheap, but also can make full use of the tankage of vast wood-working factory, saved resource, protected environment, have important economy and society benefit.
Embodiment
Describe content of the present invention in detail below by specific embodiment.
The present invention adopts the poplar powder, and its performance index are: water ratio is 5-10%; Granularity is 100 orders.
The wood powder that the present invention uses is made by the tankage that come from wood-working factory, can be the wood powder of simple poplar powder, linden powder, birch powder and other various trees, also can be the mixture of various wood powders.
It is 1: 1.2 urea-formaldehyde resin that the present invention adopts the mol ratio of urea and formaldehyde, and the performance index of urea-formaldehyde resin are as follows:
Solids content 50-55%
PH value 7.0-7.2
Viscosity (20 ℃) 150-300mPas
Free formaldehyde content＜0.3%
20-30 days storage period
The urea-formaldehyde resin that the present invention uses is not limited to this urea-formaldehyde resin, and various common urea-formaldehyde resin and modified urea-formaldehyde resin that factory generally adopts also all are suitable for; Also be applicable to simultaneously resol and melamine formaldehyde resin.
Embodiment 1
1) get the raw materials ready according to following weight proportion:
Aqueous glycol solution (mass percent concentration 10%) 30kg
Poplar powder (100 order) 100kg
2) wood powder is put into rotary mixer, aqueous glycol solution is evenly sprayed on wood powder, mix with spray gun.
3) wood powder and the ethylene glycol mixture that mixes being placed baking oven, is to carry out chemical modification reaction under 120 ℃ in temperature, reacts after 2 hours, and wood powder and ethylene glycol mixture were carried out drying 2 hours under 105 ℃, and the water ratio that makes modified wood powder is 5%.
4) preparation urea-formaldehyde resin additive: with exsiccant modified wood powder and polyacrylamide, lime carbonate is that 100: 1: 100 mixed is even by weight ratio, makes urea-formaldehyde resin additive of the present invention.
The quality index of the urea-formaldehyde resin additive of preparation is as shown in table 1.
The performance index of table 1 additive of the present invention
| Outward appearance | Tap density (g/cm 3) | 5% pH value of aqueous solution | Water ratio (%) |
| The white meal | 1.1-1.6 | 6.8-8.0 | 5-8 |
5) preparation urea formaldehyde resin adhesive: additive that the present invention is made and urea-formaldehyde resin are that 20: 100 mixed is even according to the weight part proportioning, obtain urea formaldehyde resin adhesive of the present invention.The quality index of the urea formaldehyde resin adhesive of preparation is as shown in table 4.
Embodiment 2
Except that the weight part proportioning of urea-formaldehyde resin additive of the present invention and urea-formaldehyde resin is 25: 100, all the other are identical with embodiment 1.
Embodiment 3
Except that the weight part proportioning of urea-formaldehyde resin additive of the present invention and urea-formaldehyde resin is 30: 100, all the other are identical with embodiment 1.
Embodiment 4
1) get the raw materials ready according to following weight proportion:
Aqueous glycol solution (mass percent concentration 15%) 20kg
Poplar powder (100 order) 100kg
2) wood powder is put into rotary mixer, aqueous glycol solution is evenly sprayed on wood powder, mix with spray gun.
3) wood powder and the ethylene glycol mixture that mixes being placed baking oven, is to carry out chemical modification reaction under 110 ℃ in temperature, reacts after 2 hours, and wood powder and ethylene glycol mixture were carried out drying 2 hours under 105 ℃, and the water ratio that makes modified wood powder is 4%.
4) preparation urea-formaldehyde resin additive: with exsiccant modified wood powder and polyacrylamide, lime carbonate is that 100: 3: 100 mixed is even by weight ratio, makes urea-formaldehyde resin additive of the present invention.
The quality index of the urea-formaldehyde resin additive of preparation is as shown in table 2.
The performance index of table 2 additive of the present invention
| Outward appearance | Tap density (g/cm 3) | 5% pH value of aqueous solution | Water ratio (%) |
| The white meal | 1.3-1.8 | 6.8-8.0 | 5-8 |
5) preparation urea formaldehyde resin adhesive: is that 20: 100 mixed is even with the additive that makes and urea-formaldehyde resin according to the weight part proportioning, obtains urea formaldehyde resin adhesive of the present invention.The quality index of the urea formaldehyde resin adhesive of preparation is as shown in table 4.
Embodiment 5
Except that the weight part proportioning of urea-formaldehyde resin additive of the present invention and urea-formaldehyde resin is 25: 100, all the other are identical with embodiment 4.
Embodiment 6
Except that the weight part proportioning of urea-formaldehyde resin additive of the present invention and urea-formaldehyde resin is 30: 100, all the other are identical with embodiment 4.
Embodiment 7
1) get the raw materials ready according to following weight proportion:
Aqueous glycol solution (mass percent concentration 5%) 40kg
Poplar powder (100 order) 100kg
2) wood powder is put into rotary mixer, aqueous glycol solution is evenly sprayed on wood powder, mix with spray gun.
3) wood powder and the ethylene glycol mixture that mixes being placed baking oven, is to carry out chemical modification reaction under 130 ℃ in temperature, reacts after 2 hours, and wood powder and ethylene glycol mixture were carried out drying 2 hours under 105 ℃, and the water ratio that makes modified wood powder is 3%.
4) preparation urea-formaldehyde resin additive: with exsiccant modified wood powder and polyacrylamide, lime carbonate is that 100: 3: 100 mixed is even by weight ratio, makes urea-formaldehyde resin additive of the present invention.
The quality index of the urea-formaldehyde resin additive of preparation is as shown in table 3.
The performance index of table 3 additive of the present invention
| Outward appearance | Tap density (g/cm 3) | 5% pH value of aqueous solution | Water ratio (%) |
| The white meal | 1.5-2.0 | 6.8-8.0 | 5-8 |
5) preparation urea formaldehyde resin adhesive: is that 20: 100 mixed is even with the additive that makes and urea-formaldehyde resin according to the weight part proportioning, obtains urea formaldehyde resin adhesive of the present invention.The quality index of the urea formaldehyde resin adhesive of preparation is as shown in table 4.
Embodiment 8
Except that the weight part proportioning of urea-formaldehyde resin additive of the present invention and urea-formaldehyde resin is 25: 100, all the other are identical with embodiment 7.
Embodiment 9
Except that the weight part proportioning of urea-formaldehyde resin additive of the present invention and urea-formaldehyde resin is 30: 100, all the other are identical with embodiment 7.
The quality index of the urea-formaldehyde resin adhesive of preparation is as shown in table 4.
Table 4 additive of the present invention is made the urea-formaldehyde resin adhesive capability and performance index of filler
| The pH value | Solids content (%) | Viscosity (20 ℃) (mPas) | Free formaldehyde content (%) | Working life (h) | |
| Embodiment 1-9 | 6.0-7.2 | 55-65 | 1000-3000 | ＜0.3 | ＞8 |
Embodiment 10
Except preparation during urea-formaldehyde resin additive with the modified wood powder of embodiment 1 and polyvinyl alcohol, 100: 1: 100 by weight mixed of lime carbonate evenly, all the other are identical with embodiment 1.
The quality index of the urea-formaldehyde resin additive of preparation is as shown in table 5, and the quality index such as the table 8 of the urea formaldehyde resin adhesive of preparation show.
The performance index of table 5 additive of the present invention
| Outward appearance | Tap density (g/cm 3) | 5% pH value of aqueous solution | Water ratio (%) |
| The white meal | 1.3-1.8 | 6.8-8.0 | 5-8 |
Embodiment 11
Except that the weight part proportioning of urea-formaldehyde resin additive of the present invention and urea-formaldehyde resin is 25: 100, all the other are identical with embodiment 10.
Embodiment 12
Except that the weight part proportioning of urea-formaldehyde resin additive of the present invention and urea-formaldehyde resin is 30: 100, all the other are identical with embodiment 10.
Embodiment 13
Except preparation during urea-formaldehyde resin additive with the modified wood powder of embodiment 4 and polyvinyl alcohol, 100: 3: 200 by weight mixed of lime carbonate evenly, all the other are identical with embodiment 4.
The quality index of the urea-formaldehyde resin additive of preparation is as shown in table 6.The quality index such as the table 8 of the urea formaldehyde resin adhesive of preparation show.
The performance index of table 6 additive of the present invention
| Outward appearance | Tap density (g/cm 3) | 5% pH value of aqueous solution | Water ratio (%) |
| The white meal | 1.5-2.0 | 6.8-8.0 | 5-8 |
Embodiment 14
Except that the weight part proportioning of urea-formaldehyde resin additive of the present invention and urea-formaldehyde resin is 25: 100, all the other are identical with embodiment 13.
Embodiment 15
Except that the weight part proportioning of urea-formaldehyde resin additive of the present invention and urea-formaldehyde resin is 30: 100, all the other are identical with embodiment 13.
Embodiment 16
Except preparation during urea-formaldehyde resin additive with the modified wood powder of embodiment 7 and polyvinyl alcohol, 100: 5: 300 by weight mixed of lime carbonate evenly, all the other are identical with embodiment 7.
The quality index of the urea-formaldehyde resin additive of preparation is as shown in table 7.The quality index such as the table 8 of the urea formaldehyde resin adhesive of preparation show.
The performance index of table 7 additive of the present invention
| Outward appearance | Tap density (g/cm 3) | 5% pH value of aqueous solution | Water ratio (%) |
| The white meal | 1.5-2.0 | 6.8-8.0 | 5-8 |
Embodiment 17
Except that the weight part proportioning of urea-formaldehyde resin additive of the present invention and urea-formaldehyde resin is 25: 100, all the other are identical with embodiment 16.
Embodiment 18
Except that the weight part proportioning of urea-formaldehyde resin additive of the present invention and urea-formaldehyde resin is 30: 100, all the other are identical with embodiment 16.
The quality index of the urea formaldehyde resin adhesive of preparation is as shown in table 8.
Table 8 additive of the present invention is made the urea-formaldehyde resin adhesive capability and performance index of filler
| The pH value | Solids content (%) | Viscosity (20 ℃) (mPas) | Free formaldehyde content (%) | Working life (h) | |
| Embodiment 10-18 | 6.0-7.2 | 55-65 | 1000-3000 | ＜0.3 | ＞8 |
Reference examples 1
Adopting flour as additive, is that 20: 100 mixed is even according to the weight part proportioning of flour and urea-formaldehyde resin, and example 1 in contrast.
Reference examples 2
Adopting flour as additive, is that 25: 100 mixed is even according to the weight part proportioning of flour and urea-formaldehyde resin, and example 2 in contrast.
Reference examples 3
Adopting flour as additive, is that 30: 100 mixed is even according to the weight part proportioning of flour and urea-formaldehyde resin, and example 3 in contrast.
Adopt flour as shown in table 9 as the capability and performance index of the urea formaldehyde resin adhesive of urea-formaldehyde resin additive preparation.
Table 9 flour is made the urea-formaldehyde resin adhesive capability and performance index of filler
| The pH value | Solids content (%) | Viscosity (20 ℃) (mPas) | Free formaldehyde content (%) | Working life (h) | |
| Reference examples 1-3 | 6.0-7.2 | 55-65 | 1000-3000 | ＜0.3 | ＞8 |
Experimental example 1
Adopt the embodiment of the invention 1, embodiment 4, embodiment 7, embodiment 10, embodiment 13, the urea formaldehyde resin adhesive of embodiment 16 methods preparation and the urea formaldehyde resin adhesive of reference examples 1 to make three layers of glued board respectively, preparation technology parameter is as follows:
Board using poplar board: water ratio 5～8%; Thick 1.6mm;
Tackiness agent: adopt the embodiment of the invention 1, embodiment 4, embodiment 7, embodiment 10, embodiment 13, the urea-formaldehyde resin of embodiment 16 and the urea-formaldehyde resin of comparative example 1.
Prepare glued board by following normal process:
Impregnation: the weight part proportioning of urea formaldehyde resin adhesive and ammonium chloride is in harmonious proportion evenly with 120: 1 ratio;
Applying glue: adopt manual gluing mode, central layer (interlayer) double spread, Amount of spread is 220～300g/m
2
Ageing mode and time: closed ageing, ageing 10-30 minute.
Preload pressure and time: pressure 1.0MPa, precompressed 60 minutes.
Hot pressing: hot pressing pressure 1.2MPa, hot pressing temperature is 120 ℃, hot pressing time is 60s/mm.
The performance test results of three layers of glued board making by above-mentioned technology is as shown in table 10, wherein by GB/T17657-1999 " wood-based plate and face artificial board physicochemical property experimental technique " detection method the glued board product of production is carried out Performance Detection.
The precompressed of table 10 tackiness agent and the burst size of methanal and the bonding strength of glueing joint glued board
| Test specimen | Precompressed | Burst size of methanal (mg/L) | Burst size of methanal reduced rate (%) | Bonding strength (MPa) |
| Embodiment 1 | Well | 1.02 | 23.9 | 1.23 |
| Embodiment 4 | Well | 0.99 | 26.1 | 1.40 |
| Embodiment 7 | Well | 1.12 | 16.4 | 1.40 |
| Embodiment 10 | Well | 1.01 | 24.6 | 1.18 |
| Embodiment 13 | Well | 0.91 | 32.1 | 1.31 |
| Embodiment 16 | Well | 1.02 | 23.9 | 1.27 |
| Reference examples 1 | Well | 1.34 | / | 1.16 |
Experimental example 2
Except adopting the embodiment of the invention 2, embodiment 5, embodiment 8, embodiment 11, embodiment 14, the urea formaldehyde resin adhesive of embodiment 17 preparations and the urea formaldehyde resin adhesive of reference examples 2, tackiness agent makes three layers of glued board, and the weight part proportioning of urea-formaldehyde resin adhesive and ammonium chloride is outside 125: 1 during impregnation, and all the other are identical with experimental example 1.
The performance test results of three layers of glued board making is as shown in table 11.
The precompressed of table 11 tackiness agent and the burst size of methanal and the bonding strength of glueing joint glued board
| Test specimen | Precompressed | Burst size of methanal (mg/L) | Burst size of methanal reduced rate (%) | Bonding strength (MPa) |
| Embodiment 2 | Well | 0.97 | 26.5 | 1.18 |
| Embodiment 5 | Well | 0.92 | 30.3 | 1.27 |
| Embodiment 8 | Well | 0.93 | 29.5 | 1.32 |
| Embodiment 11 | Well | 0.92 | 30.3 | 1.25 |
| Embodiment 14 | Well | 0.89 | 32.6 | 1.19 |
| Embodiment 17 | Well | 0.92 | 30.3 | 1.14 |
| Reference examples 2 | Well | 1.32 | / | 1.18 |
Experimental example 3
Except adopting the embodiment of the invention 3, embodiment 6, embodiment 9, embodiment 12, embodiment 15, the urea formaldehyde resin adhesive of embodiment 18 preparations and the urea formaldehyde resin adhesive of reference examples 3, tackiness agent makes three layers of glued board, and the weight part proportioning of urea-formaldehyde resin adhesive and ammonium chloride is outside 130: 1 during impregnation, and all the other are identical with experimental example 1.
The performance test results of three layers of glued board making is as shown in table 12.
The precompressed of table 12 tackiness agent and the burst size of methanal and the bonding strength of glueing joint glued board
| Test specimen | Precompressed | Burst size of methanal (mg/L) | Burst size of methanal reduced rate (%) | Bonding strength (MPa) |
| Embodiment 3 | Well | 0.90 | 32.3 | 1.21 |
| Embodiment 6 | Well | 0.85 | 36.1 | 1.19 |
| Embodiment 9 | Well | 0.84 | 36.8 | 1.34 |
| Embodiment 12 | Well | 0.87 | 34.6 | 1.27 |
| Embodiment 15 | Well | 1.00 | 24.8 | 1.32 |
| Embodiment 18 | Well | 0.86 | 35.3 | 1.29 |
| Reference examples 3 | Well | 1.33 | / | 1.20 |
Experimental result shows, adopt the urea formaldehyde resin adhesive of the present invention's preparation to prepare glued board, tackiness agent precompressed and flour are suitable, the burst size of methanal of glued board meets the II class glued board requirement of GB/T17657-1999 " wood-based plate and face artificial board physicochemical property experimental technique ", and formaldehyde has discharged remarkable decline, and rate of descent reaches 16.4-36.8%.Therefore, the modified wood powder that adopts the inventive method preparation can effectively reduce the burst size of methanal that glueds joint goods during as urea-formaldehyde resin additive.
The burst size of methanal and the physical and mechanical property index request of II class glued board are as follows: E1 level, burst size of methanal≤1.5mg/L; The E2 level, burst size of methanal≤5.0mg/L; Poplar plywood bonding strength 〉=0.7MPa.
By in table 10, table 11, the table 12 as can be seen, when adopting the modified wood powder for preparing through the inventive method to be used as urea-formaldehyde resin additive, the bonding strength of glueing joint goods does not only descend, increase on the contrary, this is different from general merely for reducing the common urea-formaldehyde resin additive that artificial board formaldehyde burst size makes that its mechanical property also reduces simultaneously.
In addition, the cost of additive of the present invention is about 1000 yuan/ton, and the long patent flour price is about 2000 yuan/ton.Application of Additives of the present invention is promoted, and when saving a large amount of flour, can effectively reduce the wood-based plate manufacturing cost.
Claims (10)
1, a kind of urea-formaldehyde resin additive is characterized in that containing wood powder, water-soluble high-molecular compound and inorganic mineral salt.
2, additive as claimed in claim 1 is characterized in that, described wood powder is the wood powder through glycol-modified processing.
3, additive as claimed in claim 2 is characterized in that, described ethylene glycol is that mass percent concentration is the solution of 5-15%.
4, as claim 2 or 3 described additives: the weight part proportioning that it is characterized in that wood powder, water-soluble high-molecular compound and inorganic mineral salt is 100: 0.5-7: 50-500.
5, the preparation method of urea-formaldehyde resin additive as claimed in claim 1 is characterized in that, comprises the steps: 1) adopt ethylene glycol that wood powder is carried out the modification processing; 2) wood powder, water-soluble high-molecular compound and the inorganic mineral salt with modification mixes.
6, the preparation method of urea-formaldehyde resin additive as claimed in claim 5 is characterized in that, the ethylene glycol described in the step 1) is that mass percent concentration is the solution of 5-15%, and the weight part proportioning of wood powder and ethylene glycol solution is 100: 20-40.
7, as the preparation method of claim 5 or 6 described urea-formaldehyde resin additives, it is characterized in that described glycol-modified processing wood powder is: ethylene glycol solution and wood powder are mixed, then with the wood powder that mixes and ethylene glycol under 100-150 ℃, carry out chemical reaction.
8, as the preparation method of claim 5 or 6 described urea-formaldehyde resin additives, it is characterized in that step 2) described in water-soluble high-molecular compound be selected from polyacrylamide, polyvinyl alcohol, polyacrylic acid, the sodium polyacrylate one or more.
9, as the preparation method of claim 5 or 6 described urea-formaldehyde resin additives, it is characterized in that step 2) described in the weight part proportioning of wood powder, water-soluble high-molecular compound and inorganic mineral salt of modification be 100: 0.5-7: 50-500.
10, a kind of urea formaldehyde resin adhesive comprises urea-formaldehyde resin, it is characterized in that also containing just like the arbitrary described additive of claim 1 to 3.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102408848A (en) * | 2011-08-08 | 2012-04-11 | 北京林业大学 | Additive of urea formaldehyde resin adhesive and preparation method thereof |
| CN103254860A (en) * | 2013-05-27 | 2013-08-21 | 新凯骅实业发展有限公司 | UFIM adhesive and preparation method thereof and UFIM glued ecological plant fiber board and particle board |
| CN103361015A (en) * | 2013-08-08 | 2013-10-23 | 周广胜 | Composite urea-formaldehyde glue composition and application method thereof |
| WO2015086035A1 (en) * | 2013-12-12 | 2015-06-18 | Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. | Wood material product or natural-fiber composite material product and use of a formaldehyde-free amino or amide resin to produce said product |
| CN105985746A (en) * | 2015-03-06 | 2016-10-05 | 尤殿凯 | Additive of urea-formaldehyde resin adhesive for artificial board and preparation method of adhesive |
| CN106584610A (en) * | 2016-12-21 | 2017-04-26 | 陈永钦 | Special glue regulating agent for plywood industry |
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2008
- 2008-06-30 CN CN2008101158888A patent/CN101298520B/en not_active Expired - Fee Related
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102408848A (en) * | 2011-08-08 | 2012-04-11 | 北京林业大学 | Additive of urea formaldehyde resin adhesive and preparation method thereof |
| CN102408848B (en) * | 2011-08-08 | 2013-05-22 | 北京林业大学 | Additive of urea formaldehyde resin adhesive and preparation method thereof |
| CN103254860A (en) * | 2013-05-27 | 2013-08-21 | 新凯骅实业发展有限公司 | UFIM adhesive and preparation method thereof and UFIM glued ecological plant fiber board and particle board |
| CN103254860B (en) * | 2013-05-27 | 2014-06-11 | 新凯骅实业发展有限公司 | UFIM adhesive and preparation method thereof and UFIM glued ecological plant fiber board and particle board |
| CN103361015A (en) * | 2013-08-08 | 2013-10-23 | 周广胜 | Composite urea-formaldehyde glue composition and application method thereof |
| CN103361015B (en) * | 2013-08-08 | 2014-08-20 | 周广胜 | Composite urea-formaldehyde glue composition and application method thereof |
| WO2015086035A1 (en) * | 2013-12-12 | 2015-06-18 | Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. | Wood material product or natural-fiber composite material product and use of a formaldehyde-free amino or amide resin to produce said product |
| CN105985746A (en) * | 2015-03-06 | 2016-10-05 | 尤殿凯 | Additive of urea-formaldehyde resin adhesive for artificial board and preparation method of adhesive |
| CN106584610A (en) * | 2016-12-21 | 2017-04-26 | 陈永钦 | Special glue regulating agent for plywood industry |
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|---|---|
| CN101298520B (en) | 2010-08-18 |
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