CN102321439B - Additive agent of urea-formaldehyde resin adhesive and preparation method thereof - Google Patents

Additive agent of urea-formaldehyde resin adhesive and preparation method thereof Download PDF

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Publication number
CN102321439B
CN102321439B CN 201110225987 CN201110225987A CN102321439B CN 102321439 B CN102321439 B CN 102321439B CN 201110225987 CN201110225987 CN 201110225987 CN 201110225987 A CN201110225987 A CN 201110225987A CN 102321439 B CN102321439 B CN 102321439B
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urea
formaldehyde resin
additive
resin adhesive
formaldehyde
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CN102321439A (en
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李建章
张世锋
高强
周文瑞
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Beijing Forestry University
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Beijing Forestry University
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Abstract

The invention provides an additive agent of urea-formaldehyde resin adhesive and a preparation method thereof. The additive agent of the urea-formaldehyde resin adhesive is prepared from the following components in parts by weight: 100 parts of modified starch, 1-5 parts of polymer compound, 300-500 parts of desulfurization gypsum, and 0.1-2 parts of swelling agent which are mixed uniformly to obtain the additive agent. The additive agent of the urea-formaldehyde resin can replace flour to be added into urea-formaldehyde resin, the adhesive is endowed with favorable prepressing when artificial plates are prepared, the high production efficiency of the artificial plates is ensured, simultaneously the formaldehyde emission of the artificial plates can be reduced effectively, the problem of volume reduction in the process of preparing the urea-formaldehyde resin adhesive is solved, and the physical mechanical property of the artificial plates is improved.

Description

A kind of additive of urea-formaldehyde resin adhesive, its preparation method
Technical field
The present invention relates to a kind of additive of tackiness agent, particularly additive of a kind of urea-formaldehyde resin for artificial board tackiness agent and preparation method thereof.
Background technology
Over 30 years, the timber industry of China has obtained fast development.2009, China's wood-based plate ultimate production 1.1546 billion cubic meters, glued board output 4451.24 ten thousand steres, core-board 1478.71 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 6,000,000 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 more than 100 ten thousand tons of whole meal flours for this reason every year, amount to more than 20 hundred million yuan of Renminbi, cause great foodstuff waste, be unfavorable for the Sustainable development of wood-based plate industry.
Simultaneously, because what generally adopt in the Wood-based Panel Production is that formaldehyde is tackiness agent, particularly use in a large number urea-formaldehyde resin adhesive, therefore causing wood-based plate and goods (furniture, timber floor, Indoor Wooden finishing material etc.) thereof to exist the formaldehyde release And Spread of Solute, is the main source of formaldehyde pollution in the room air pollution.
Along with the day by day raising 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 potential carcinogenic substance, may be the inducement of rhinocarcinoma, laryngocarcinoma, skin carcinoma.According to statistics, China reaches more than ten ten thousand by the death toll that exceeds the quata that room air pollution causes every year, and outpatient service people number of times more than 20 ten thousand exceeds the quata.Solve the artificial board formaldehyde release And Spread of Solute and arrived instant stage.
The SO of coal-burning power plant 2Quantity discharged accounts for national SO 250% of total emission volumn.Desulfurated plaster (FGD) is the treatment S O of thermal power plant 2After the industry byproduct that obtains.At present, China's desulfurated plaster output is very huge, and annual production 10 million t solves the problem of utilizing of desulfurated plaster, has important economic and social profit.The porousness of gypsum is expected to reduce the burst size of methanal that urea-formaldehyde resin glueds joint goods as filler.
In the prior art, the report that desulfurated plaster is applied in preparation cement gel stick aspect is arranged.For example there is Chinese patent application number to be " a kind of method of utilizing incineration of refuse flyash to prepare fast gravity die cement-based adhesive " for the denomination of invention of 200910052851.X; It is that desulfurated plaster is applied in cement and the mortar that the name that " nonmetalliferous ore " magazine the 31st volume the 2nd periodical is stepped on is called " desulfurated plaster/flyash composite cementitious binder performance study " etc.But yet there are no it is applied in relevant report in the middle of the adhesion agent for artificial board.
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) in the urea-formaldehyde resin for artificial board tackiness agent, add formaldehyde-trapping agent; 4) wood-based plate is carried out aftertreatment.But these technological methods all exist certain defect.As, 1) although 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, such as the isocyanates tackiness agent, because tackiness agent is expensive, cause the production cost of wood-based plate often to increase considerably, enterprise and user are difficult to accept; 3) in the urea-formaldehyde resin for artificial board tackiness agent, add formaldehyde-trapping agent, although can effectively reduce the free formaldehyde in artificial plate burst size, often reduce simultaneously the bonding strength of wood-based plate; Simultaneously, general formaldehyde-trapping agent price often is higher than urea-formaldehyde resin adhesive far away, its adding has improved product cost, reduced product competitiveness, for example the FC-5 formaldehyde-trapping agent price of the large deer development Co., Ltd. of Japan production is 50000 yuan/tons, if add 1%-2% in glue, then urea-formaldehyde resin cost per ton will improve 500~1000 yuan; 4) wood-based plate is carried out aftertreatment, it is 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 such as publication number, adopt the ammonia vacuum method, publication number is to disclose a kind for the treatment of unit that reduces artificial board formaldehyde burst size in the utility model patent of CN2394770, and is larger but finishing apparatus is often invested.
Chinese patent application a kind of additive of urea-formaldehyde resin adhesive that number has been 200810115888.8 Patent Application Publication, this additive contains wood powder, water-soluble high-molecular compound and inorganic mineral salt, although the urea-formaldehyde resin additive that this patent of invention provides has reduced the glued board burst size of methanal, but when replacing flour to carry out the urea-formaldehyde resin impregnation with this additive, resulting urea-formaldehyde resin adhesive is compared with adding flour, and volume reduces to some extent.This is unfavorable to the rate of utilization that improves urea-formaldehyde resin.
Summary of the invention
The objective of the invention is the problem for above prior art existence, a kind of additive of urea-formaldehyde resin for artificial board tackiness agent is provided.This additive is that a kind of treated starch and desulfurated plaster are the material of main composition, and this additive can substitute flour and join in the urea-formaldehyde resin.Described additive is grouped into by the one-tenth of following weight part meter:
100 parts of treated starches;
Macromolecular compound 1-5 part;
Swelling agent 0.1-2.0 part;
Desulfurated plaster 300-500 part.
Preferably, described additive is grouped into by the one-tenth of following weight part meter:
100 parts of treated starches;
Macromolecular compound 2-4 part;
Swelling agent 0.5-1.5 part
Desulfurated plaster 350-450 part.
Described treated starch is that starch pasting is made, and can adopt existing ordinary method to make.Specifically starch is dispersed in water among the present invention, is heated to 60-80 ℃, form even pasty state solution, then dehydrate, obtain treated starch.The treated starch water ratio that obtains is 4-10%.
Described treated starch is made by one or more that are selected from W-Gum, wheat starch, tapioca (flour), the acorn starch.
Described treated starch be fineness at 100-500 purpose powder, its objective is the cold-water solution and the thickening effectiveness that increase treated starch.
The water ratio of described treated starch is 4-10%.
Described desulfurated plaster is that fineness is the 200-600 order, to guarantee enough thickening effectivenesss.
Described macromolecular compound is selected from one or both in polyacrylamide, the polyvinyl alcohol.
Described swelling agent is selected from that Sodium dodecylbenzene sulfonate, sodium lauryl sulphate, dioctyl sodium sulfosuccinate, Sodium glycocholate, benzalkonium chloride, Morpan BB, polysorbate, glycerin fatty acid ester, lipid acid sorb are smooth, in the polysorbate one or more.
Described macromolecular compound under certain condition can with formaldehyde reaction, reduce artificial board formaldehyde burst size.
It is several that described swelling agent is not limited to enumerate, every can be in use, can be by stirring foaming effect, the material that increases the urea-formaldehyde resin adhesive volume all is applicable to the present invention.
Another object of the present invention provides the preparation method of described additive.
It comprises the steps:
1) starch is dispersed in water, is heated to 60-80 ℃, form even pasty state solution, then dehydrate, obtain treated starch;
2) treated starch and desulfurated plaster, macromolecular compound raw material mix.
A further object of the present invention provides a kind of urea-formaldehyde resin adhesive that contains described additive.
Described urea-formaldehyde resin adhesive contains urea-formaldehyde resin and described additive, and the mass ratio of described urea-formaldehyde resin and additive is 100: 20-30.
Described urea-formaldehyde resin adhesive also contains solidifying agent; Described solidifying agent is selected from a kind of in ammonium chloride, ammonium sulfate, the ammonium formiate, preferably sulfuric acid ammonium, ammonium chloride; The mass ratio of described urea-formaldehyde resin and described solidifying agent is 100: 0.2-2.0.
Urea-formaldehyde resin can be various common urea-formaldehyde resin and the modified urea-formaldehyde resin that factory generally adopts.
Urea-formaldehyde resin used in the present invention is that the mol ratio of urea and formaldehyde is 1: 1.1 urea-formaldehyde resin.Its performance index are as follows:
Additive provided by the invention also is applicable to resol and melamine formaldehyde resin.
The present invention also provides a kind of preparation method of described urea-formaldehyde resin adhesive, and it is urea-formaldehyde resin, additive, solidifying agent to be mixed make.
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;
2, the present invention makes up treated starch, macromolecular compound, desulfurated plaster, swelling agent according to a certain ratio, the additive of the urea-formaldehyde resin adhesive for preparing, use it for the preparation urea-formaldehyde resin adhesive, solved when the preparation urea-formaldehyde resin adhesive, when additive is mixed with urea-formaldehyde resin, the problem that volume reduces.
3, additive of the present invention can give urea-formaldehyde resin good precompressed, guarantees glued board and core-board production efficiency;
4, additive of the present invention can be in hot pressing of artificial board and formaldehyde generation chemical reaction, fundamentally reduces preferably artificial board formaldehyde burst size, guarantees the wood-based plate physical and mechanical property;
5, 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;
6, therefore the manufacturing cost of additive of the present invention itself has guaranteed that the manufacturing cost of wood-based plate can not improve, and has decreased well below flour;
7, additive main raw material wide material sources of the present invention are cheap, have important economic and social profit as the substitute products of flour.
Embodiment
Following examples are used for explanation the present invention, but are not used for limiting the scope of the invention.
Among the embodiment, the urea-formaldehyde resin performance index of employing are as follows:
The performance index of the urea-formaldehyde resin additive that the embodiment of the invention prepares such as table 1 are not.
Table 1
Outward appearance Tap density g/cm3 5% pH value of water solution Water ratio %
The white meal 0.8-1.6 5.0-7.0 3.0-8.0
The capability and performance index of the urea-formaldehyde resin adhesive of embodiment of the invention preparation such as table 2 are not.
Table 2
The preparation of embodiment 1 urea-formaldehyde resin adhesive
1) the 10kg wheat starch be dispersed in be heated to 60 ℃ in the 100kg water, form even pasty state solution, then in 105 ℃ lower dry 2 hours, obtain treated starch, the water ratio of the treated starch that obtains is 4%, fineness is 100 orders.
2) with the treated starch that obtains in the step 1, polyacrylamide, Sodium dodecylbenzene sulfonate, desulfurated plaster according to 100: 1: 0.1: 300 weight proportion is mixing in mixing machine, obtains urea-formaldehyde resin additive.The fineness of described desulfurated plaster is 200 orders.
3) with the urea-formaldehyde resin additive that makes according to urea-formaldehyde resin: urea-formaldehyde resin additive: the weight proportion of ammonium chloride=100: 20: 1 mixes, and obtains urea-formaldehyde resin adhesive of the present invention.
The preparation of embodiment 2 urea-formaldehyde resin adhesives
1) the 10kg wheat starch be dispersed in be heated to 60 ℃ in the 100kg water, form even pasty state solution, then in 105 ℃ lower dry 2 hours, obtain treated starch, the water ratio of the treated starch that obtains is 6%, fineness is 200 orders.
2) with the treated starch that obtains in the step 1, polyacrylamide, sodium lauryl sulphate, desulfurated plaster according to 100: 5: 2: 500 weight proportion is mixing in mixing machine, obtains urea-formaldehyde resin additive.The fineness of described desulfurated plaster is 300 orders.
3) with the urea-formaldehyde resin additive that makes according to urea-formaldehyde resin: urea-formaldehyde resin additive: the weight proportion of ammonium chloride=100: 30: 2 mixes, and obtains urea-formaldehyde resin adhesive of the present invention.
The preparation of embodiment 3 urea-formaldehyde resin adhesives
1) the 10kg wheat starch be dispersed in be heated to 60 ℃ in the 100kg water, form even pasty state solution, then in 105 ℃ lower dry 2 hours, obtain treated starch, the water ratio of the treated starch that obtains is 10%, fineness is 300 orders.
2) with the treated starch that obtains in the step 1, polyacrylamide, benzalkonium chloride, desulfurated plaster according to 100: 2: 1.5: 350 weight proportion is mixing in mixing machine, obtains urea-formaldehyde resin additive.The fineness of described desulfurated plaster is 300 orders.
3) with the urea-formaldehyde resin additive that makes according to urea-formaldehyde resin: urea-formaldehyde resin additive: the weight proportion of ammonium chloride=100: 30: 2 mixes, and obtains urea-formaldehyde resin adhesive of the present invention.
The preparation of embodiment 4 urea-formaldehyde resin adhesives
1) the 10kg wheat starch be dispersed in be heated to 60 ℃ in the 100kg water, form even pasty state solution, then in 105 ℃ lower dry 2 hours, obtain treated starch, the water ratio of the treated starch that obtains is 6%, fineness is 300 orders.
2) with the treated starch that obtains in the step 1, polyacrylamide, polysorbate, desulfurated plaster according to 100: 4: 0.5: 450 weight proportion is mixing in mixing machine, obtains urea-formaldehyde resin additive.The fineness of described desulfurated plaster is 300 orders.
3) with the urea-formaldehyde resin additive that makes according to urea-formaldehyde resin: urea-formaldehyde resin additive: the weight proportion of ammonium chloride=100: 30: 0.2 mixes, and obtains urea-formaldehyde resin adhesive of the present invention.
The preparation of embodiment 5 urea-formaldehyde resin adhesives
1) the 10kg wheat starch be dispersed in be heated to 60 ℃ in the 100kg water, form even pasty state solution, then in 105 ℃ lower dry 2 hours, obtain treated starch, the water ratio of the treated starch that obtains is 7%, fineness is 300 orders.
2) with the treated starch that obtains in the step 1, polyacrylamide, dioctyl sodium sulfosuccinate, desulfurated plaster according to 100: 3: 1: 400 weight proportion is mixing in mixing machine, obtains urea-formaldehyde resin additive.The fineness of described desulfurated plaster is 600 orders.
3) with the urea-formaldehyde resin additive that makes according to urea-formaldehyde resin: urea-formaldehyde resin additive: the weight proportion of ammonium chloride=100: 25: 0.6 mixes, and obtains urea-formaldehyde resin adhesive of the present invention.
The preparation of embodiment 6 urea-formaldehyde resin adhesives
1) 5kg W-Gum and 5kg acorn starch be dispersed in be heated to 70 ℃ in the 100kg water, form even pasty state solution, then in 105 ℃ lower dry 2 hours, obtain treated starch, the water ratio of the treated starch that obtains is 4%, fineness is 500 orders.
2) with the treated starch that obtains in the step 1, polyvinyl alcohol, Sodium dodecylbenzene sulfonate, desulfurated plaster according to 100: 3: 1.5: 400 weight proportion is mixing in mixing machine, obtains urea-formaldehyde resin additive.The fineness of described desulfurated plaster is 300 orders.
3) with the urea-formaldehyde resin additive that makes according to urea-formaldehyde resin: urea-formaldehyde resin additive: the weight proportion of ammonium sulfate=100: 25: 0.4 mixes, and obtains urea-formaldehyde resin adhesive of the present invention.
The preparation of embodiment 7 urea-formaldehyde resin adhesives
1) 5kg W-Gum and 5kg tapioca (flour) be dispersed in be heated to 70 ℃ in the 100kg water, form even pasty state solution, then in 105 ℃ lower dry 2 hours, obtain treated starch, the water ratio of the treated starch that obtains is 5%, fineness is 300 orders.
2) with the treated starch that obtains in the step 1, polyvinyl alcohol, polyacrylamide, sodium lauryl sulphate, desulfurated plaster according to 100: 1: 2: 1: 400 weight proportion is mixing in mixing machine, obtains urea-formaldehyde resin additive.The fineness of described desulfurated plaster is 600 orders.
3) with the urea-formaldehyde resin additive that makes according to urea-formaldehyde resin: urea-formaldehyde resin additive: the weight proportion of ammonium sulfate=100: 30: 0.6 mixes, and obtains urea-formaldehyde resin adhesive of the present invention.
The preparation of embodiment 8 urea-formaldehyde resin adhesives
1) 5kg W-Gum and 5kg tapioca (flour) be dispersed in be heated to 70 ℃ in the 100kg water, form even pasty state solution, then in 105 ℃ lower dry 2 hours, obtain treated starch, the water ratio of the treated starch that obtains is 7%, fineness is 500 orders.
2) with the modification wheat starch that obtains in the step 1, polyvinyl alcohol, sodium lauryl sulphate, polysorbate, desulfurated plaster according to 100: 3: 0.5: 0.5: 400 weight proportion is mixing in mixing machine, obtains urea-formaldehyde resin additive.The fineness of described desulfurated plaster is 200 orders.
3) with the urea-formaldehyde resin additive that makes according to urea-formaldehyde resin: urea-formaldehyde resin additive: the weight proportion of ammonium sulfate=100: 30: 1 mixes, and obtains urea-formaldehyde resin adhesive of the present invention.
The performance of the urea-formaldehyde resin additive that obtains embodiment 1-8 step 2) is as shown in table 3 below.
Table 3
The capability and performance of the urea-formaldehyde resin adhesive of embodiment of the invention 1-8 preparation such as table 4 are not.
Table 4
Comparative example 1
Employing flour is additive, urea-formaldehyde resin: flour: ammonium chloride=100: 20: 1 mixes as a comparative example 1.(unit is kg)
Comparative example 2
Employing flour is additive, urea-formaldehyde resin: flour: ammonium chloride=100: 30: 1 mixes as a comparative example 2.(unit is kg)
The capability and performance of the urea-formaldehyde resin adhesive of embodiment of the invention comparative example 1-2 preparation is as shown in table 5.
Table 5 flour is made the urea-formaldehyde resin adhesive capability and performance index of filler
Experimental example
Adopt respectively the urea-formaldehyde resin of embodiment of the invention 1-7 method preparation and the common urea-formaldehyde resin of comparative example 1-2 to make three layers of glued board, preparation technology parameter is as follows:
Board using poplar board: water ratio 5~8%; Thick 1.6mm;
Tackiness agent: adopt the urea-formaldehyde resin adhesive of embodiment of the invention 1-7 and the urea-formaldehyde resin adhesive of comparative example 1-2.
Prepare glued board by following normal process:
Applying glue: adopt manual gluing mode, central layer (interlayer) double spread, Amount of spread is 260g/m 2
Aging and time: closed ageing, ageing 20 minutes.
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 technique is as shown in table 11, wherein by GB/T17657-1999 " wood-based plate and face artificial board physicochemical property experimental technique " detection method the plywood product of production is carried out Performance Detection.
The precompressed of table 6 tackiness agent rate of expansion tackiness agent reaches
Burst size of methanal and the bonding strength of glueing joint glued board
* explanation: " rate of expansion contrast " is when preparing tackiness agent, the volume contrast after adding additive in the urea-formaldehyde resin and adding flour, and the volume behind the interpolation flour is by 100%.
Experimental result shows, adopts additive of the present invention to make filler and prepares glued board for urea-formaldehyde resin adhesive, and tackiness agent precompressed, volume and flour are suitable, and the burst size of methanal of glued board descends to some extent, and rate of descent reaches more than 20%.
Simultaneously, by it can also be seen that in the table 6, when adopting the filler 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 be different from general merely for reducing artificial board formaldehyde burst size so that the common urea-formaldehyde resin additive that its mechanical property also reduces simultaneously.
Adopting Chinese patent application number is that the rate of expansion of the urea-formaldehyde resin adhesive that makes of disclosed embodiment 10 prepares in 200810115888.8 the application for a patent for invention urea-formaldehyde resin binding agent and the embodiment among the present invention and comparative example compares as shown in table 7.Comparative result be the additive of the urea-formaldehyde resin adhesive for preparing of the present invention when the preparation urea-formaldehyde resin adhesive, solved and in urea-formaldehyde resin, added the problem that volume reduces behind the additive.The tackiness agent that embodiment 10 prepares for embodiment 10 in application number 200810115888.8 application documents in the table.
The contrast of table 7 tackiness agent rate of expansion
The * explanation: the rate of expansion contrast is for when preparing tackiness agent, the additive that adds the present invention's preparation in the urea-formaldehyde resin and the volume contrast of adding behind the additive that embodiment 10 provides in application number 200810115888.8 application documents, comparative example 1 is for adding volume behind the flour by 100% in the urea-formaldehyde resin.
Application number is that the concrete preparation method of 200810115888.8 disclosed embodiment 10 preparation urea formaldehyde resin adhesives is as follows:
1) get the raw materials ready according to following weight proportion:
Aqueous glycol solution (mass percent concentration 10%) 30kg
Poplar Powder (100 order) 1000kg
2) wood powder is put into stirrer, with spray gun aqueous glycol solution is evenly sprayed on wood powder, mix.
3) wood powder and the ethylene glycol mixture that mixes placed baking oven, after 2 hours, wood powder and ethylene glycol mixture were carried out drying 2 hours in 120 ℃ of lower reactions of temperature under 105 ℃, making the modified wood powder water ratio is 5%.
4) modified wood powder and polyvinyl alcohol, 100: 1: 100 by weight the ratio of calcium carbonate with drying mixes, and obtains the additive of urea-formaldehyde resin adhesive.
5) preparation urea formaldehyde resin adhesive: the additive of the urea-formaldehyde resin adhesive that makes and the urea-formaldehyde resin weight proportion according to 20: 100 is mixed, obtain urea formaldehyde resin adhesive.
Adopt the above-mentioned urea formaldehyde resin adhesive that makes to make three layers of glued board, preparation technology parameter is as follows:
Board using poplar board: water ratio 5~8%; Thick 1.6mm;
Tackiness agent: adopt the above-mentioned urea formaldehyde resin adhesive that makes
Prepare glued board by following normal process:
Impregnation: urea formaldehyde resin adhesive and weight ammonium chloride part proportioning are 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
Aging and time: closed ageing, ageing 20 minutes.
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.
In addition, the cost of additive of the present invention is about 1200 yuan/tons, and the long patent flour price is about 2000 yuan/tons.The application of additive of the present invention when saving a large amount of flour, can effectively reduce the wood-based plate manufacturing cost.

Claims (6)

1. the additive of a urea-formaldehyde resin adhesive is characterized in that, described additive is grouped into by the one-tenth of following weight part meter:
100 parts of treated starches;
Macromolecular compound 1-5 part;
Swelling agent 0.1-2 part;
Desulfurated plaster 300-500 part;
Described treated starch is that fineness is at 100-500 purpose powder, described desulfurated plaster is that fineness is the 200-600 order, described macromolecular compound is selected from one or both in polyacrylamide, the polyvinyl alcohol, and described swelling agent is selected from smooth one or more of Sodium dodecylbenzene sulfonate, sodium lauryl sulphate, dioctyl sodium sulfosuccinate, Sodium glycocholate, benzalkonium chloride, Morpan BB, polysorbate, glycerin fatty acid ester, lipid acid sorb.
2. the additive of urea-formaldehyde resin adhesive according to claim 1 is characterized in that, described additive is grouped into by the one-tenth of following weight part meter:
100 parts of treated starches;
Macromolecular compound 2-4 part;
Swelling agent 0.5-1.5 part;
Desulfurated plaster 350-450 part.
3. a method for preparing the additive of claim 1 or 2 described urea-formaldehyde resin adhesives is characterized in that, it comprises the steps:
1) starch is dispersed in water, is heated to 60-80 ℃, form even pasty state solution, then dehydrate, obtain treated starch;
2) treated starch and desulfurated plaster, swelling agent, macromolecular compound raw material mix.
4. a urea-formaldehyde resin adhesive that contains claim 1 or 2 described additives is characterized in that, described urea-formaldehyde resin adhesive contains urea-formaldehyde resin and described additive, and the mass ratio of described urea-formaldehyde resin and described additive is 100:20-30.
5. urea-formaldehyde resin adhesive according to claim 4 is characterized in that, it also contains solidifying agent; The mass ratio of described urea-formaldehyde resin and solidifying agent is 100:0.2-2.0.
6. a preparation method who prepares urea-formaldehyde resin adhesive claimed in claim 5 is characterized in that, it is urea-formaldehyde resin, additive, solidifying agent to be mixed make.
CN 201110225987 2011-08-08 2011-08-08 Additive agent of urea-formaldehyde resin adhesive and preparation method thereof Expired - Fee Related CN102321439B (en)

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CN106182316A (en) * 2016-08-29 2016-12-07 广西横县新威林板业有限公司 The method that full Eucalyptus leftover pieces produce fire-retardant oriented wood chipboard
CN106479393B (en) * 2016-11-09 2018-07-24 林添波 A kind of filler for Wood industry adhesive
CN108901559B (en) * 2018-07-23 2021-01-26 中国水利水电科学研究院 Vegetation restoration method for coal mining area

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