CN104830258B - High anti-wet fiber plate sticks agent with modified urea-formaldehyde resin glue - Google Patents

High anti-wet fiber plate sticks agent with modified urea-formaldehyde resin glue Download PDF

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CN104830258B
CN104830258B CN201410705633.2A CN201410705633A CN104830258B CN 104830258 B CN104830258 B CN 104830258B CN 201410705633 A CN201410705633 A CN 201410705633A CN 104830258 B CN104830258 B CN 104830258B
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urea
formaldehyde
melamine
added
fiberboard
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CN104830258A (en
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韦淇峰
詹满军
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Anhui Chizhou Fenglin Wood Industry Co ltd
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GUANGXI FENGLIN FORESTRY GROUP CO Ltd
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Abstract

Agent is sticked with modified urea-formaldehyde resin glue the invention discloses a kind of high anti-wet fiber plate, is raw material by formaldehyde, urea, a small amount of melamine and oxidized starch, by changing traditional handicraft, is prepared using the weak acid neutral weak base technique of the urea 3 times of formaldehyde 1 time.Adhesive is had the netted improved structure of Uron rings and three azacyclo-s concurrently, both improved the reactivity of methylol molecular radical and hot-press solidifying effect in adhesive, hydrophilic radical can be effectively closed again.Fiberboard is prepared using the present invention, the water resistance and bonding strength of fiberboard can be significantly improved, fiberboard easy dilatancy and the problems such as intensity difference under high humidity atmosphere is solved, with water-fast, environmentally friendly and extend the service life function of fiberboard woodwork.

Description

High anti-wet fiber plate sticks agent with modified urea-formaldehyde resin glue
Technical field
The invention belongs to fiberboard manufacturing technology field, more particularly to a kind of Midst density anti-wet fiber plate modified urea-formaldehyde The technology of preparing of Resin adhesive.
Background technology
Medium density fibre board (MDF) is, using wood fibre or other plant fiber as raw material, to be prepared by fiber, apply adhesive Or other additives, under heating pressurized conditions, thickness is pressed into not less than 1.5mm, and nominal density scope is in 0.65g/cm3- Sheet material between 0.80g/cm3.
Medium density fibre board (MDF) is with the closely knit exquisiteness of uniform in material, structure, and surfacing is bright and clean, and performance is stable, radiationless and easy In advantages such as processing, at present in Furniture manufacture and decorative craft of building using accounting for more than 90%, but most fibers Plate is the furniture type or plain edition medium density fibre board (MDF) that use under drying regime, it is impossible to meet fiber under moist or climax wet condition Plate is used to manufacture the use such as high-grade office furniture, integral cabinet, toilet furniture, partition of toilet, bath cabinet, bag storage cabinet and locker On the way, the definition and requirement according to national standard GB/T11718-2009 to fiberboard under moist or climax wet condition, not only require fiber Plate has minimum burst size of methanal(Environmental protection)And it is necessary to tested by humidity resistance(It is moistureproof), to prove that fiberboard has Water resistance and preferable intensity, so as to ensure that woodwork furniture or ornaments that fiberboard is made are difficult to expand, ftracture, deform or distort Destruction.But most domestic artificial board enterprise only produces the plain edition fiberboard used under drying regime, water resistance compared with Difference, not only thickness swelling rate is higher, and often boils the i.e. expansion in 2 hours of 2 hours or 70 DEG C hot bubbly waters in boiling water and fall apart Or be not molded, each index of mechanical strength etc. can not be more detected, to reach high moistureproof and waterproof purpose, it is necessary to which Fibreboard Production is used Urea-formaldehyde adhesive and technique carry out synthesis improvement research.
The content of the invention
For the medium density fibre board (MDF) thickness swelling rate that is used under existing drying regime is high, moisture-sensitive deformation and intolerant to The defects such as water, influence product uses scope and the service life of timber product's furniture.The invention provides a kind of high anti-wet fiber Plate sticks agent with modified urea-formaldehyde resin glue, for manufacturing moistureproof medium density fibre board (MDF), and fiberboard mechanical property can be made to be better than GB/ Climax wet condition player whose turn comes next tool type uses medium density fibre board (MDF) as defined in T11718-2009(MDF-FN HMR), free formaldehyde reaches Environmentally friendly E1/E0 grades, moistureproof and waterproof effect is obvious, expands fiberboard and uses scope and extension woodwork furniture service life.
The technical problem to be solved in the present invention is to provide a kind of high anti-wet fiber plate adhesive of function admirable.The present invention Another to be solved technical problem provides a kind of easy and with low cost anti-wet fiber plate of production operation with modified urea-formaldehyde tree Fat adhesive manufacture method.
In order to solve the above technical problems, the present invention uses following technical scheme:
High anti-wet fiber plate sticks agent, including following raw material weight proportioning of soup processed component with modified urea-formaldehyde resin glue:Formaldehyde 50.0- 55.0 parts, 30.0-35.0 parts of urea, 5.0-8.0 parts of melamine, 0.5-1.0 parts of oxidized starch and appropriate acid solution, alkali lye.
Preparation method includes following processing step:
1)Formaldehyde is disposably put into reactor, the lower acid solution that adds of stirring adjusts pH to be 3.5-5.0;
2)First time urea and oxidized starch are added, the addition of urea is the 40.0-44.0% of total colloid amount, and oxidation is formed sediment The addition of powder is the 0.2-1.0% of total colloid amount;
3)40-50 DEG C is heated to, in 60-80 degree insulation reactions 20-60min;
4)Addition lye pH adjustment is 6.0-7.0, adds second of urea and melamine, and urea accounts for glue gross mass 27.0- 30.0%, melamine accounts for glue gross mass 1-3%, in 80-90 DEG C of insulation reaction 20-60min;
5)Lye pH adjustment=7.5-8.5 is added, second of melamine is added, melamine accounts for glue gross mass 4-7%, in 80-90 DEG C of insulation 20-60min;
6)70-75 DEG C is cooled to, third time urea is added, urea addition is total colloid amount 26.0-30.0%, is incubated 20- 60min;
7)Less than 45 DEG C are cooled to, lye pH adjustment=7.5-8.5 is added, discharging is made the high moistureproof medium density fiber of environmental protection Plate sticks agent with modified urea-formaldehyde resin glue.
Modified urea-formaldehyde resin glue sticks agent preparation process and uses 1 formaldehyde, 2 feeding modes of -3 urea-melamines, and Reacted successively in weak acid-neutrality-weak alkaline medium.
Adhesive of the present invention is prepared using the technique of weak acid-neutrality-weak base, and adds small amounts starch and melamine Comprehensively modifying is carried out, adhesive is had the improved structure of Uron rings and three azacyclo-s concurrently, methylol point in Lauxite has both been improved The reactivity and hot-press solidifying effect of subbase group, can effectively close hydrophilic radical again, so as to shorten adhesive in fiberboard heat The hardening time of pressure and improve its bonding strength, be finally reached and improve the waterproof water resistance of fiberboard, with high mechanical strength and The distinguishing features such as good stability of the dimension, solve fiberboard easy dilatancy and the problems such as intensity difference under high humidity atmosphere.This hair Bright formaldehyde feeds intake for 1 time, urea feeds intake for three times, and melamine feeds intake twice, and makes raw material successively in pH=3.5-5.0,6.0-7.0 And after being reacted in tri- kinds of media environments of 7.5-8.5, finally prepare the water-repellent modified urea-formaldehyde resin adhesive of inexpensive high-quality. With water-fast, environmentally friendly and extension fiberboard woodwork service life function.
Acid solution of the present invention is that any one or two kinds and the above in hydrochloric acid, formic acid, ammonium sulfate or ammonium chloride are mixed Compound, and concentration of polymer solution is 20-50%.Described alkali lye be caustic soda, potassium hydroxide and triethanolamine in any one or Two kinds and thing mixed above, and concentration of polymer solution is 20-50%.Described formalin mass fraction is 36.4-37.5%, institute Urea purity >=98.0% stated, described melamine purity >=99.0%.
Invention adhesive quality is:Outward appearance is white viscous liquid, free formaldehyde≤0.08%, viscosity=16-25 seconds (20 DEG C, T-4 glasss), hardening time=100-250 seconds, solids content=54 ± 1.0%, pH value=7.5-8.5, storage period >=20 day 。
Invention adhesive usage amount is 150-250kg/m3, is passed through at the defibrator process blow-off pipe that medium density fibre board (MDF) is produced Screw pump is applied, and appropriate adjustment heat pressing process is constant, and fiberboard physical and mechanical properties can be made and humidity resistance is better than state Mark《GB/T11718-2009 medium density fibre board (MDF)s》The furniture type medium density fibre board (MDF) used under high- humility state(FN-MDF HMR)Specified in index request, meanwhile, burst size of methanal is≤5.0mg/100g, far below national standard《GB18580-2001 rooms Interior trim finishing material wood-based plate and product Form aldehyde release limitation》It is defined E1 grades(≤9.0 mg/100g).
Embodiment
Technical scheme is described further with reference to example, it is of the present invention in addition to special indicate Degree is mass percentage content.
Embodiment 1:
1st, raw material proportioning
Raw material Weight(㎏) Content(%) Remarks
Formaldehyde 500 37.0
Urea 300 46.3 U1=15、U2=70 U3=80
Melamine 50 99.5 M1=10、M2=40
Oxidized starch 5 Technical grade
Acid solution In right amount 20-50
Alkali lye In right amount 20-50
2nd, synthesis technique step:
1)Formaldehyde is disposably put into reactor, the lower acid solution that adds of stirring adjusts pH to be 3.5-4.0.
2)First time urea and oxidized starch are added, the addition of urea is 45.0 % of total colloid amount.
3)40-50 DEG C is heated to, in 60-80 degree insulation reactions 20-30min.
4)Addition lye pH adjustment is 6.0-6.5, adds second of urea(Account for glue amount 20.0-25.0%)And melamine(Account for The 1-2% of glue amount), in 80-90 DEG C of insulation reaction 20-60min.
5)Lye pH adjustment=7.5-8.5 is added, second of melamine is added(Account for the 4-5% of glue amount), in 80-90 DEG C of insulation 30-60min。
6)70-75 DEG C is cooled to, third time urea is added(Addition is the 25.0-30.0% of total colloid amount)It is incubated 20- 60min。
3)Less than 45 DEG C are cooled to, lye pH adjustment=7.5-8.5 dischargings are added.
3rd, product quality indicator:
Viscosity 16.8S(T-4 glasss, 20 DEG C) Density 1.20㎏/m3
Solids content 54.4% Hardening time 132S
PH value 7.82 Outward appearance Milky homogeneous liquid
Free formaldehyde 0.05% Working life >=20 days
Embodiment 2:
1st, raw material proportioning
Raw material Weight(㎏) Content(%) Remarks
Formaldehyde 600 37.0
Urea 350 46.3 U1=185、U2=75 U3=90
Melamine 80 99.5 M1=20、M2=60
Oxidized starch 10 Technical grade
Acid solution In right amount 20-50
Alkali lye In right amount 20-50
2nd, synthesis technique step:
1)Formaldehyde is disposably put into reactor, the lower acid solution that adds of stirring adjusts pH to be 4.0-4.5.
2)First time urea and oxidized starch are added, the addition of urea is the 50.0% of total rubber.
3)40-50 DEG C is heated to, in 60-80 DEG C of insulation reaction 30-40min.
4)Addition lye pH adjustment is 6.5-7.0, adds second of urea(Account for the 20.0-25.0% of glue amount)And melamine (Account for the 1-3% of glue gross mass), in 80-90 DEG C of insulation reaction 30-40min.
5)Lye pH adjustment=7.8-8.0 is added, second of melamine is added(Account for the 4-7% of glue amount), in 80-90 DEG C of insulation 20-40min。
6)70-75 DEG C is cooled to, third time urea is added(Addition is the 25.0-30.0% of total colloid amount)It is incubated 20- 40min。
7)Less than 45 degree are cooled to, lye pH adjustment=7.5-8.5 dischargings are added,
3rd, product quality indicator:
Viscosity 21.2S(T-4 glasss, 20 DEG C) Density 1.20㎏/m3
Solids content 55.1% Hardening time 167S
PH value 8.15 Outward appearance Milky homogeneous liquid
Free formaldehyde 0.03% Working life >=20 days
Embodiment 3:
1st, raw material proportioning
Raw material Weight(㎏) Content(%) Remarks
Formaldehyde 500 37.0
Urea 350 46.3 U1=170、U2=100 U3=80
Melamine 80 99.5 M1=12、M2=18
Oxidized starch 10 Technical grade
Acid solution In right amount 20-50
Alkali lye In right amount 20-50
2nd, synthesis technique step:
1)Formaldehyde is disposably put into reactor, the lower acid solution that adds of stirring adjusts pH to be 4.5-5.0.
2)First time urea and oxidized starch are added, the addition of urea is the 48% of total rubber.
3)40-50 DEG C is heated to, in 60-80 degree insulation reactions 40-60min.
4)Addition lye pH adjustment is 6.0-6.5, adds second of urea(Account for the 20.0-25.0% of glue amount)And melamine (Account for the 1-3% of glue gross mass), in 80-90 DEG C of insulation reaction 50-60min.
5)Lye pH adjustment=8.0-8.5 is added, second of melamine is added(Account for the 4-7% of glue amount), in 80-90 DEG C of insulation 50-60min。
6)70-75 DEG C is cooled to, third time urea is added(Account for the 25.0-30.0% of glue amount)It is incubated 40-60min.
7)Less than 45 DEG C are cooled to, lye pH adjustment=7.5-8.5 dischargings are added.
3rd, product quality indicator:
Viscosity 20.6S(T-4 glasss, 20 DEG C) Density 1.20㎏/m3
Solids content 54.9% Hardening time 235S
PH value 8.43 Outward appearance Milky homogeneous liquid
Free formaldehyde 0.01% Working life >=20 days

Claims (1)

1. a kind of high anti-wet fiber plate sticks the preparation method of agent with modified urea-formaldehyde resin glue, it is characterised in that
The raw material is:50.0-55.0 parts of formaldehyde, 30.0-35.0 parts of urea, 5.0-8.0 parts of melamine, oxidized starch 0.5- 1.0 parts and acid solution, alkali lye;Its preparation method includes following processing step:
1)Formaldehyde is disposably put into reactor, the lower acid solution that adds of stirring adjusts pH to be 3.5-5.0;
2)First time urea and oxidized starch are added, the addition of oxidized starch is the 0.2-1.0% of total colloid amount;
3)40-50 DEG C is heated to, in 60-80 degree insulation reactions 20-60min;
4)Addition lye pH adjustment is 6.0-7.0, adds second of urea and melamine, and melamine accounts for glue gross mass 1-3%, In 80-90 DEG C of insulation reaction 20-60min;
5)Lye pH adjustment=7.5-8.5 is added, second of melamine is added, melamine accounts for glue gross mass 4-7%, in 80-90 DEG C insulation 20-60min;
6)70-75 DEG C is cooled to, third time urea is added, 20-60min is incubated;
7)Less than 45 DEG C are cooled to, lye pH adjustment=7.5-8.5 dischargings are added, that is, the high moistureproof medium density fibre board (MDF) of environmental protection is made and uses Modified urea-formaldehyde resin glue sticks agent.
CN201410705633.2A 2014-11-28 2014-11-28 High anti-wet fiber plate sticks agent with modified urea-formaldehyde resin glue Active CN104830258B (en)

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CN105599101A (en) * 2015-12-25 2016-05-25 广西丰林木业集团股份有限公司 Method for producing mold-proof function fiberboard
CN107030841B (en) * 2017-04-05 2019-09-10 大亚人造板集团有限公司 Milling fiberboard and its production method are engraved in a kind of E0 grades of low imbibition
CN106883798A (en) * 2017-04-18 2017-06-23 广西丰林木业集团股份有限公司 The consolidated floor base material manufacture adhesive that is modified
CN109096967A (en) * 2018-06-28 2018-12-28 广西丰林木业集团股份有限公司 A kind of preparation method of composite modified gluing agent and the manufacturing method of anti-wet fiber plate
CN110724485A (en) * 2019-11-06 2020-01-24 徐州盛安化工科技有限公司 Urea-formaldehyde resin adhesive and preparation method thereof
CN113136049B (en) * 2021-04-21 2023-03-21 广西三威家居新材股份有限公司 Urea-formaldehyde resin reinforcing auxiliary agent, urea-formaldehyde resin for fiber board and preparation method
CN114855504A (en) * 2022-05-16 2022-08-05 广东轻工职业技术学院 Glue applying combination for fluorine-free food paper and preparation method and application thereof

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CN102408855A (en) * 2011-07-18 2012-04-11 广西大学 Urea-formaldehyde resin adhesive for moisture-proof environment-friendly medium density fiberboard, production method and composite additive

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JPS61157567A (en) * 1984-12-28 1986-07-17 Daicel Chem Ind Ltd Adhesive for plywood

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Publication number Priority date Publication date Assignee Title
CN102408855A (en) * 2011-07-18 2012-04-11 广西大学 Urea-formaldehyde resin adhesive for moisture-proof environment-friendly medium density fiberboard, production method and composite additive

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Effective date of registration: 20231017

Address after: 247100 guogang village, Meilong Town, Guichi District, Chizhou City, Anhui Province

Patentee after: Anhui Chizhou Fenglin Wood Industry Co.,Ltd.

Address before: 530031 No. 22 Baisha Avenue, Nanning, the Guangxi Zhuang Autonomous Region

Patentee before: GUANGXI FENGLIN WOOD INDUSTRY GROUP CO.,LTD.