CN103361015B - Composite urea-formaldehyde glue composition and application method thereof - Google Patents
Composite urea-formaldehyde glue composition and application method thereof Download PDFInfo
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- CN103361015B CN103361015B CN201310342111.6A CN201310342111A CN103361015B CN 103361015 B CN103361015 B CN 103361015B CN 201310342111 A CN201310342111 A CN 201310342111A CN 103361015 B CN103361015 B CN 103361015B
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Abstract
The invention relates to a composite urea-formaldehyde glue composition and an application method thereof. The composition comprises urea-formaldehyde resin, bark powder, illite, pyrophyllite, muscovite, anion powder, halloysite, calcite, carbon fiber, shell powder and water. When a certain amount of larch bark powder, which contains abundant tannin and lignin, is added into a urea-formaldehyde resin glue in due time, the larch bark powder can perform the functions of substituting equal amount of glue, saving the glue and lowering the free phenols and aldehydes, and can also enhance the quality of the artificial board and prevent the artificial board from cracking. The bark is a wood production leftover, and is a pure natural nontoxic biomass material; and thus, when the bark is substituted for part of the urea-formaldehyde glue, the artificial board production technique, including gluing, hot pressing and the like, is not changed, the inspection proves that the produced artificial board satisfies the national standard, and the release amount of residual aldehydes can be greatly lowered.
Description
Technical field
The invention belongs to the Wood Science and Technology field in Forestry Engineering, be specifically related to a kind of compound urea-formaldehyde adhesive composition and application method thereof.
Background technology
Urea-formaldehyde resin adhesive is widely used tackiness agent in Wood-based Panel Production field, because its production technique is simple, cheap, glue performance is good, global Wood-based Panel Production does not replace it at performance, price and the process aspect glue more intact than urea-formaldehyde resin completely with glue so far.
But the major defect of urea-formaldehyde glue is: main raw material formaldehyde serious environment pollution and the injury human body of producing this glue.Have free formaldehyde to overflow at building board production process and use procedure, the house of the furniture and fixtures of making all discharges toxic gas formaldehyde, serious harm health of people and contaminate environment for a long time.In addition, due to after urea-formaldehyde resin solidifies, further decompose and emit formaldehyde, cause that glue-line shrinks, its ageing-resistant performance is poor, and the product of production easily chaps.Due to above reason, calendar year 2001, country just put into effect building and ornament materials pressure standard, wood-based plate has been proposed to strict formaldehyde and discharged running water standard.Glue producer, in order to reduce the free formaldehyde content of urea-formaldehyde glue, adopts various measures one after another, and some manufacturers take to reduce the mol ratio of urea and formaldehyde, although can make free formaldehyde content reduce, bonding quality also can reduce; Also have the trapping agent (zl01130562.2) of applying condensed tannin extracts as urea-formaldehyde glue, to reduce free formaldehyde content, although reduced free formaldehyde content as the trapping agent of urea-formaldehyde glue with condensed tannin extracts, but because condensed tannin extracts production cost is high, increase urea-formaldehyde glue cost, lose the market competitiveness, cannot use by spread.
The object of this invention is to provide a kind of urea-formaldehyde glue and substitute (agent) technology and using method, the tackiness agent that can substitute equal quantities in the time of Wood-based Panel Production is saved resin added, can reduce again burst size of methanal, can also improve wood-based plate quality simultaneously, the wood-based plate of producing is not chapped, and raw materials cost is low, pure natural, nontoxic, be easy to get, technique is simple, is applicable to the production of the extensive wood-based plate of industry.
The inventor after deliberation and test of many times, according to containing abundant tannin and xylogen in bark of dahurian larch powder, the phenolic hydroxyl group, the aldehyde radical principle of the synthesis material formaldehyde of alternative PF under certain condition that wherein contain, find to use bark of dahurian larch powder in due course between, add in urea-formaldehyde resin adhesive by a certain amount of, the tackiness agent that can play alternative equal quantities is economized on glue, is reduced free formaldehyde effect, can also improve wood-based plate quality, make it that effect of be full of cracks not occur.Bark of dahurian larch is timber productional surplus thing, is a kind of pure natural, nontoxic biological material.With its Substitute For Partial urea-formaldehyde adhesive, do not change the Wood-based Panel Production such as applying glue, hot pressing technique, the wood-based plate of production after testing quality meets national standard, and burst size of methanal can significantly reduce.
At present poisoning in research process urea-formaldehyde resin adhesive is low, in order to reduce free formaldehyde content, mostly adopt and in glue process or in use procedure, add various additives or properties-correcting agent, although can have certain effect to reducing free formaldehyde release, the defect facing remains other physicochemical property declines, the Wood-based Panel Production Efficiency Decreasings (hot pressing time prolongation) etc. such as the bonding strength of high cost, modified resin.Have not yet to see direct use biological material without modification, do not change under hot pressing technique with regard to the report aspect alternative urea-formaldehyde resin adhesive compacting wood-based plate.
As everyone knows, urea-formaldehyde resin also has some obvious shortcomings, and except ageing resistance is poor, hot water resistance is poor, can not serve as outdoor wood-based plate with glue, its fatal shortcoming is that the wood-based plate glueing joint exists formaldehyde release And Spread of Solute.Along with the raising day by day of the outdoor interior Environmental awareness of people, health perception, quality of life consciousness, people more and more notice that urea-formaldehyde resin adhesive in use can emit formaldehyde, it glueds joint wood-based plate also can constantly discharge formaldehyde in the process using, polluted air, infringement people's is healthy; Particularly in urea-formaldehyde resin production process used for shaving board, be with in addition formaldehyde pollution emission problem, very large to surrounding environment harm
Summary of the invention
For above-mentioned deficiency of the prior art, the object of this invention is to provide a kind of compound urea-formaldehyde adhesive composition and application method thereof, the tackiness agent that can substitute equal quantities in the time of Wood-based Panel Production is saved resin added, can reduce again burst size of methanal, can also improve wood-based plate quality, the wood-based plate of producing is not chapped simultaneously.Specifically, the invention discloses a kind of urea-formaldehyde resin adhesive substituting agent and operation technique, in order to reduce urea-formaldehyde glue resin added, fall low-free formaldehyde release, to improve wood-based plate quality.The present invention uses bark of dahurian larch for raw material, and this raw material is timber production or plant produced residuum or waste, and bark of dahurian larch is pulverized, and before Wood-based Panel Production gluing, joins in the glue modulating and can use.Prove through shop test, in urea-formaldehyde glue, use this product, when hot pressing, formaldehyde odor obviously reduces, and production cost reduces, and bonding strength improves, and product is put for a long time and do not occurred to chap.
In order to realize foregoing invention object, the application provides following technical scheme:
A kind of compound urea-formaldehyde adhesive composition, the weight part of described composition consists of
Urea-formaldehyde resin 60-80 part
Tree bark powder 10-20 part
Illite 1-5 part
Pyrophyllite 1-5 part
White mica 1-5 part
Negative ion powder 1-2 part
Xuyong soil 1-5 part
Calcite 1-5 part
Carbon fiber 1-2 part
Oyster shell whiting 1-5 part
Water 2-20 part.
Described carbon fiber is of a size of 100nm-200nm, and the particle diameter of described tree bark powder is 80-150 order, and the particle diameter of other mineral and oyster shell whiting is 100-120 order.
The raw material of described tree bark powder is selected from least one in the bark of tamarack, willow, black wattle plant, fir, Cortex Fraxini mandshuricae, toothed oak tree, elm, Chinese hemlock spruce, dragon spruce, Korean pine, fish-scale floss, evergreen chinquapin, Horsetail Beefwood, pinus sylvestris var. mongolica, mangrove, maple, eucalyptus, hard wood, acacia rachii, Albizzia kalkora or black wattle plant.
To produce shaving board as example, the application method of described composition is as follows:
(1) dry, by ready raw material, utilize drying plant be dried to water ratio be 2%, 80～100 DEG C, proper extension time of drying, make dry as far as possible evenly;
(2) raw material pulverizing, grinds to form 80-150 object tree bark powder by plant bark, and carbon fiber is broken into 100nm-200nm, and oyster shell whiting grinds to form 100-120 order, and other mineral powders are ground to form to 100-120 order;
(3) mix; By weight ratio, tree bark powder is heated to 50 DEG C, by other raw materials except urea-formaldehyde resin, is added to the water respectively, limit adds, and stir on limit, obtains compound, for subsequent use, also can, in applying glue equipment, first in proportion by two kinds of particle mix and blend 1～2min, then carry out applying glue;
(4) applying glue adopts ring type glue mixer;
(5) mat formation and mixing raw material is mated formation into grading structure slab with mechanical forming machine;
(6) according to glue consumption needs, the urea-formaldehyde resin modulating is deducted to 10%-30%, add the compound in the step 3 modulating of equivalent weight, stir, can add spreadometer to use, after precompressed, 160 DEG C of hot pressing temperatures, unit pressure 3.5MPa, hot-forming under hot pressing time 30s/mm thickness of slab condition, make shaving board hair plates, through cooling, cutting edge, plate facing sand light.
The present invention, it is the final result that contriver obtains through a large amount of performing creative labours, find after deliberation, tree bark powder is under the effect of a small amount of inorganic mineral powder, without the processing through early stage, directly Substitute For Partial urea-formaldehyde resin, play the effect of sizing agent, simultaneously, these inorganic mineral powders interact, when only reaching best proportioning, bond effect is the most obvious, although had tree bark powder be applied to the report in modified urea-formaldehyde resin in prior art, but its great majority are that tree bark powder is after basic solution is processed, Substitute For Partial phenol, in the present invention, tree bark powder is as the mode of action that directly substitutes urea-formaldehyde resin, also rarely has in the prior art report, even if there are indivedual reports, its effect aspect inhibition free phenol and aldehyde, and bond effect aspect is also not as the present invention.
Although, known as this area, mineral filler add-on is more, can reduce and use glue cost, and addition is too much, can extend the set time of resin, reduces the water tolerance of bonding strength and resin.To be those skilled in the art decide as the cost of work viscosity, coating, ageing-resistant performance, intensity, hardness, gummed power and goods according to the situation concentration of resin, the specification of quality that glueds joint goods the amount of counting of mineral filler, although its effect can be estimated, but in the selection of raw material type, effect each other, and in concrete best proportioning, need to pay performing creative labour can obtain, and is not only that the test of limited number of time can reach.
beneficial effect
Tackiness agent gummed intensity and wood-breaking rate after bark of dahurian larch powder substitutes
In laboratory and production plant carry out test of many times, do not changing three layers of glued board suppressing under plywood hot-pressing processing parameter condition, by state-set standard detect bonding strength and wood failure rate index as follows:
Bonding strength >=2MPa wood failure rate=100%
All reach and exceed national Specification.
Free formaldehyde obviously reduces
Dazzling, pungent formaldehyde taste completely dissolve when hot pressing, replaces a kind of fragrance road of sticking with paste.The glued board of producing after testing burst size of methanal is average 1mg/100g, reaches E
0grade standard (≤9mg/100g).
The long-term placement of glued board of producing is not chapped.
1, can reach 20%-40% by the alternative amount of the directly alternative urea-formaldehyde resin adhesives such as tree bark powder, can reduce urea-formaldehyde glue Amount of spread, reduce the production cost of wood-based plate.
2,, due to the adding of tree bark powder, reduced free aldehyde and discharged; Improve bonding strength 10%; Improve ageing-resistant performance, wood-based plate is not chapped, adding of negative ion powder simultaneously, effectively reduce the generation of the especially free aldehyde of objectionable impurities.
3, use operating procedure simple, this substituting agent does not change adhesive-preparing technology and wood-based plate heat pressing process.
Embodiment
Embodiment 1
60 parts of urea-formaldehyde resins
20 parts of tree bark powder
1 part of illite
1 part of pyrophyllite
1 part of white mica
2 parts of negative ion powders
1 part, Xuyong soil
1 part, calcite
1 part, carbon fiber
2 parts of oyster shell whitings
20 parts, water.
Described carbon fiber is of a size of 100nm, and the particle diameter of described tree bark powder is 80 orders, and the particle diameter of other mineral and oyster shell whiting is 100 orders.
For the production of 3 layers of glued board: veneer thickness 1.3-1.4mm, Veneer moisture≤8%, Amount of spread 300g/cm
2(two-sided), hot pressing pressure 3.5MPa, 160 DEG C of temperature, hot pressing time 7 minutes, displays 24 hours after unloading plate.Get 2cm × 2cm test specimen, with 60 DEG C of hot-water soaks, within 72 hours, do experiment, the bonding strength of glued board, 2MPa, wood-breaking rate 100%, burst size of methanal 0.1 mg/L.
Embodiment 2
80 parts of urea-formaldehyde resins
10 parts of tree bark powder
1 part of illite
1 part of pyrophyllite
1 part of white mica
1 part of negative ion powder
1 part, Xuyong soil
Calcite 1
1 part, carbon fiber
1 part of oyster shell whiting
2 parts, water.
Described carbon fiber is of a size of 200nm, and the particle diameter of described tree bark powder is 150 orders, and the particle diameter of other mineral and oyster shell whiting is 120 orders.
For the production of 5 layers of birch plywood: veneer thickness 1.3-1.4mm, Veneer moisture≤7%, Amount of spread 280g/cm
2(two-sided), hot pressing pressure 1.0MPa, temperature 100-120 DEG C, hot pressing time 7 minutes, displays 24 hours after unloading plate.Get 2cm × 2cm test specimen, within 72 hours, do experiment with 60 DEG C of hot-water soaks, the bonding strength of glued board, 2.5MPa, wood-breaking rate 100%, burst size of methanal 0.1 mg/L.The glued board more than suppressing is deposited and is not all chapped above for 1 year.
Finally it should be noted that: obviously, above-described embodiment is only for the application's example is clearly described, and the not restriction to embodiment.For those of ordinary skill in the field, can also make other changes in different forms on the basis of the above description.Here without also giving exhaustive to all embodiments.And the apparent variation of being amplified out thus or variation are still among protection scope of the present invention.
Claims (2)
1. a compound urea-formaldehyde adhesive composition, is characterized in that: the weight part of described composition consists of
Urea-formaldehyde resin 60-80 part
Tree bark powder 10-20 part
Illite 1-5 part
Pyrophyllite 1-5 part
White mica 1-5 part
Negative ion powder 1-2 part
Xuyong soil 1-5 part
Calcite 1-5 part
Carbon fiber 1-2 part
Oyster shell whiting 1-5 part
Water 2-20 part, described carbon fiber is of a size of 100nm-200nm, the particle diameter of described tree bark powder is 80-150 order, the particle diameter of other mineral and oyster shell whiting is 100-120 order, and the raw material of described tree bark powder is selected from least one in the bark of tamarack, willow, fir, Cortex Fraxini mandshuricae, toothed oak tree, elm, Chinese hemlock spruce, dragon spruce, Korean pine, fish-scale floss, evergreen chinquapin, Horsetail Beefwood, pinus sylvestris var. mongolica, mangrove, maple, eucalyptus, hard wood, acacia rachii, Albizzia kalkora or black wattle plant.
2. an application method for composition described in claim 1, is characterized in that, applying step is as follows:
(1) dry, by ready raw material, utilize drying plant be dried to water ratio be 2%, 80～100 DEG C, proper extension time of drying, make dry as far as possible evenly;
(2) raw material pulverizing, grinds to form 80-150 object tree bark powder by plant bark, and carbon fiber is broken into 100nm-200nm, and oyster shell whiting grinds to form 100-120 order, and other mineral powders are ground to form to 100-120 order;
(3) mix; By weight ratio, tree bark powder is heated to 50 DEG C, by other raw materials except urea-formaldehyde resin, is added to the water respectively, limit adds, and stir on limit, obtains compound, for subsequent use, also can, in applying glue equipment, first in proportion by two kinds of particle mix and blend 1-2min, then carry out applying glue;
(4) applying glue adopts ring type glue mixer;
(5) mat formation and mixing raw material is mated formation into grading structure slab with mechanical forming machine;
(6) according to glue consumption needs, the urea-formaldehyde resin modulating is deducted to 10%-30%, add the compound in the step 3 modulating of equivalent weight, stir, can add spreadometer to use, after precompressed, 160 DEG C of hot pressing temperatures, unit pressure 3.5MPa, hot-forming under hot pressing time 30s/mm thickness of slab condition, make shaving board hair plates, through cooling, cutting edge, plate facing sand light.
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| CN201310342111.6A CN103361015B (en) | 2013-08-08 | 2013-08-08 | Composite urea-formaldehyde glue composition and application method thereof |
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| CN104762042B (en) * | 2015-03-30 | 2017-08-29 | 广西宾阳县荣良新材料科技有限公司 | A kind of modified urea-formaldehyde resin glue sticks agent and preparation method thereof |
| CN108556089A (en) * | 2018-02-26 | 2018-09-21 | 赖东 | A kind of environment-friendly type raw wooden skin synthesis technology |
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