CN106883365B - A kind of E used for shaving board0Environment-friendly modified Lauxite of grade and preparation method thereof - Google Patents
A kind of E used for shaving board0Environment-friendly modified Lauxite of grade and preparation method thereof Download PDFInfo
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- CN106883365B CN106883365B CN201710098579.3A CN201710098579A CN106883365B CN 106883365 B CN106883365 B CN 106883365B CN 201710098579 A CN201710098579 A CN 201710098579A CN 106883365 B CN106883365 B CN 106883365B
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G12/00—Condensation polymers of aldehydes or ketones with only compounds containing hydrogen attached to nitrogen
- C08G12/02—Condensation polymers of aldehydes or ketones with only compounds containing hydrogen attached to nitrogen of aldehydes
- C08G12/40—Chemically modified polycondensates
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G12/00—Condensation polymers of aldehydes or ketones with only compounds containing hydrogen attached to nitrogen
- C08G12/02—Condensation polymers of aldehydes or ketones with only compounds containing hydrogen attached to nitrogen of aldehydes
- C08G12/26—Condensation polymers of aldehydes or ketones with only compounds containing hydrogen attached to nitrogen of aldehydes with heterocyclic compounds
- C08G12/34—Condensation polymers of aldehydes or ketones with only compounds containing hydrogen attached to nitrogen of aldehydes with heterocyclic compounds and acyclic or carbocyclic compounds
- C08G12/36—Ureas; Thioureas
- C08G12/38—Ureas; Thioureas and melamines
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L61/00—Compositions of condensation polymers of aldehydes or ketones; Compositions of derivatives of such polymers
- C08L61/20—Condensation polymers of aldehydes or ketones with only compounds containing hydrogen attached to nitrogen
- C08L61/32—Modified amine-aldehyde condensates
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Abstract
The invention discloses a kind of E used for shaving board0The environment-friendly modified Lauxite of grade.In addition, the invention also discloses the E used for shaving board0The preparation method of the environment-friendly modified Lauxite of grade, the method uses high-concentration formaldehyde and the urea of low mole prop0rtion for primary raw material, polyvinyl alcohol, melamine and reinforcing agent is added to be modified Lauxite, pass through being precisely controlled for synthesis technology, eliminate vacuum dewatering technique process, so that not only content of formaldehyde is low, Pre-pressure property is good, interior bonding strength and surface bonding intensity are high and at low cost for the Lauxite of preparation.
Description
Technical field
The present invention relates to a kind of Lauxites more particularly to a kind of modified urea-formaldehyde resin and preparation method thereof.
Background technique
Since the 21th century, China's wood-based panel industry high speed development, existing artificial board enterprise Wan Yujia, yield are more than 2
Billion cubic meter, more than 8,000 hundred million yuan of the output value, be the first big country of world's Wood-based Panel Production, consumption and foreign trade.2015, I
State's wood-based plate total output reaches 2.87 billion cubic meters, occupies No. 1 in the world for years.2012 are only wood-based plate glue consumption i.e.
Up to 2492.4 ten thousand tons, being converted into solid adhesive is 1312.2 ten thousand tons.And urea-formaldehyde resin adhesive accounts for wood-based plate glue consumption
90% or more, it is the maximum kind of dosage in adhesive.Lauxite is the cheapest kind of price in synthetic resin, as
Based Wood Adhesives have the characteristics that bonding property is excellent, technological operation performance is good, colourless, are the masters of indoor adhesive material product
Want glue kind.
With the development of wood-based panel industry, to urea-formaldehyde resin adhesive, more stringent requirements are proposed, especially in adhesive
Free formaldehyde content and wood-based plate in burst size of methanal, Europe, the U.S. and Japan and other countries are to artificial board formaldehyde burst size
There is stringent standard, in China, produce the urea-formaldehyde adhesive of low content of free formaldehyde, reduce the burst size of methanal in wood-based plate,
Become the hot issue of wood industry and people's common concern.
In order to which the Lauxite of low content of free formaldehyde content is prepared, can by reduce formaldehyde and urea molar ratio,
The methods of control synthetic technological condition and use additive, but the molar ratio for reducing formaldehyde and urea can also make Lauxite gluing
The performance of agent declines, and such as adhesion strength decline (especially wet strength decline is more significant), storage stability is poor, curing time extension
Deng, it is difficult to meet the requirement of wood-processing industry.In Lauxite synthesis process, melamine, phenol, polyvinyl alcohol etc. is added
Lauxite is modified, reduces free formaldehyde content, the performance for improving adhesive is also effective method.This respect, state
Inside and outside to have a large amount of document report, China also achieves many research achievements, and is widely used in practice in production.
Process variability is big when greatest problem existing for Lauxite used for shaving board is synthesis, when synthesis temperature and pH value
And F/U molar ratio (that is, molar ratio of formaldehyde and urea) when varying slightly the performance of synthesized resin change, and synthesize
Process needs vacuum dehydration, exists as solid content fluctuation is big, slab Pre-pressure property is poor, and when burst size of methanal is low in shakiness when high
Determine state and other issues, accurately synthesizes control technology to keep its performance to stablize to need.
Summary of the invention
It is an object of the invention to provide a kind of environment-friendly modified Lauxite in place of overcome the deficiencies in the prior art, more
For specifically, the purpose of the present invention is to provide a kind of E used for shaving board0The environment-friendly modified Lauxite of grade.
Another object of the present invention is to provide the E used for shaving board0The preparation method of the environment-friendly modified Lauxite of grade.
The object of the invention is also to provide one kind to contain the E used for shaving board0The plane of the environment-friendly modified Lauxite of grade
Card.
To achieve the above object, the technical solution used in the present invention are as follows:
A kind of E used for shaving board0The environment-friendly modified Lauxite of grade, the raw material including following parts by weight: formaldehyde 45~52
Part, it is 40~68 parts of urea, 2~4 parts of melamine, 0.05~0.10 part of polyvinyl alcohol, 0.2~0.4 part of reinforcing agent, suitable
Bronsted lowry acids and bases bronsted lowry.
In the above-mentioned technical solutions, acid refers to acidic materials, not only includes traditional acid, further includes aobvious acidity in the solution
Salt.Alkali refers to alkaline matter, includes not only traditional alkali, further includes the salt of aobvious alkalinity in the solution.
As E used for shaving board of the present invention0The preferred embodiment of the environment-friendly modified Lauxite of grade, wherein described
Reinforcing agent is aqueous association type rheology modifier.It is further preferable that the reinforcing agent is polyurethanes association type rheology modifier.
It is further preferable that the polyurethanes association type rheology for the RM series that the reinforcing agent is HEUR or Rhom and Hass produces
At least one of modifying agent.In certain embodiments of the present invention, the reinforcing agent is the model of Rhom and Hass's production
For the polyurethanes association type rheology modifier of RM-12W.It is worth noting that, F/ (U+M) < 0.95 of the invention, and trimerization
The additional amount of cyanamide 4% hereinafter, its performance (such as glue-joint strength, water resistance, resistance to ag(e)ing, storage stability) all under
Drop, inventor have found after largely testing, and when the aqueous association type rheology modifier of 0.2-0.4% is added, not only may be used
Achieve the purpose that improve Adhensive performance, and also has facilitation to plate burst size of methanal is reduced.
In the present invention, the resin is synthesized using high-concentration formaldehyde (mass percent concentration is 44~50%), saved
The technical process for having gone vacuum dehydration can prepare non-dehydration E under the conditions of popular response temperature0Level shaving board environment-friendly type changes
Property Lauxite.As E used for shaving board of the present invention0The preferred embodiment of the environment-friendly modified Lauxite of grade, wherein institute
Stating formaldehyde is the formalin that mass percent concentration is 48%.
As E used for shaving board of the present invention0The preferred embodiment of the environment-friendly modified Lauxite of grade, wherein described
The parts by weight of formaldehyde are 47.5 parts, and the parts by weight of the urea are 49.37 parts, and the parts by weight of the melamine are
2.9 parts, the parts by weight of the polyvinyl alcohol are 0.08 part, and the parts by weight of the reinforcing agent are 0.3 part.
As E used for shaving board of the present invention0The preferred embodiment of the environment-friendly modified Lauxite of grade, wherein described
Alkali be selected from one of sodium hydroxide, triethanolamine, wherein the range of the mass percent concentration of the aqueous slkali be 20~
99%.It is further preferable that it is that 30% sodium hydroxide solution, 99% triethanolamine are molten that the alkali, which is selected from mass percent concentration,
One of liquid.
As E used for shaving board of the present invention0The preferred embodiment of the environment-friendly modified Lauxite of grade, wherein described
Acid includes strong acid and weak acid.The strong acid is selected from one of hydrochloric acid, sulfuric acid, wherein the mass percent of the strong acid solution
The range of concentration is 15~30%.It is further preferable that the strong acid be selected from mass percent concentration be 20% hydrochloric acid solution,
One of 20% sulfuric acid solution.The weak acid is selected from one of formic acid, ammonium chloride, ammonium sulfate, the weak acid solution
The range of mass percent concentration is 15~30%.It is further preferable that it is 20% that the weak acid, which is selected from mass percent concentration,
One of formic acid solution, 20% ammonium chloride solution, 20% ammonium sulfate.
As E used for shaving board of the present invention0The preferred embodiment of the environment-friendly modified Lauxite of grade, wherein institute
State modified urea-formaldehyde resin viscosity be 150~300cp/23 DEG C (note: " cp/23 DEG C " refers to rotational viscometer under the conditions of 23 DEG C
Obtained viscosity number is detected, cp is viscosity unit's centipoise).
In addition, the present invention also provides above-described E used for shaving board0The preparation side of the environment-friendly modified Lauxite of grade
Method, comprising the following steps:
(1) formaldehyde is put into reaction kettle, stirred, adjusted pH=3.0 with acid, and be warming up to 45~55 DEG C, polyvinyl alcohol is added,
Heat preservation 25~35 minutes；
(2) first batch urea is added, keeps the temperature 25~35 minutes at 45~55 DEG C；
(3) plus alkali adjusts pH=7.0~7.5, and second lot urea and melamine are mixed in investment reaction kettle；
(4) 90~92 DEG C are warming up to, timing keeps the temperature 40~60 minutes, keeps pH >=6.5；
(5) cool down 83~93 DEG C, acid adding adjusts pH=4.8~5.2, carries out polycondensation to 150~180 cp/30 of target viscosities
DEG C when, terminate reaction；
(6) cool down, add adjusting PH with base=6.0~6.3, reaction kettle is added in third batch urea, keep the temperature 25 at 82~85 DEG C
~35 minutes, add adjusting PH with base=6.6~7.0, cools down；
(7) 65~75 DEG C are cooled to, reaction kettle is added in the 4th batch urea, reacted 18~30 minutes；
(8) 55~65 DEG C are cooled to, reaction kettle is added in the 5th batch urea, is reacted 18~30 minutes；
(9) plus alkali adjustment pH=7.5~8.0 continue to be cooled to 35~45 DEG C of dischargings in 45~55 DEG C of addition reinforcing agents；
Wherein, the amount of the first batch urea is the 5.9~15.0% of urea total amount, the amount of the second lot urea
It is the 22.1~50.0% of urea total amount, the amount of the third batch urea is the 17.6~45.0% of urea total amount, described
The amount of four batch urea is the 8.8~30.0% of urea total amount, the amount of the 5th batch urea be urea total amount 4.4~
20.0%.
As E used for shaving board of the present invention0The preferred implementation side of the preparation method of the environment-friendly modified Lauxite of grade
Formula, wherein the amount of the first batch urea is the 8.3% of urea total amount, and the amount of the second lot urea is urea total amount
34.6%, the amount of the third batch urea is the 33.8% of urea total amount, and the amount of the 4th batch urea is that urea is total
The 17.0% of amount, the amount of the 5th batch urea is the 6.3% of urea total amount.
As E used for shaving board of the present invention0The preferred implementation side of the preparation method of the environment-friendly modified Lauxite of grade
Formula, wherein in the step (1), acid is strong acid.Preferably, the strong acid is selected from one of hydrochloric acid, sulfuric acid, wherein described
The range of the mass percent concentration of strong acid solution is 15~30%.It is further preferable that the strong acid is dense selected from mass percent
Spend one of the hydrochloric acid solution for 20%, 20% sulfuric acid solution.In the step (5), acid is weak acid.Preferably, described
Weak acid is selected from one of formic acid, ammonium chloride, ammonium sulfate, and the range of the mass percent concentration of the weak acid solution is 15~
30%.It is further preferable that the weak acid be selected from mass percent concentration be 20% formic acid solution, 20% ammonium chloride solution,
One of 20% ammonium sulfate.
In addition, the present invention also provides a kind of E0Level shaving board, the technical solution taken are as follows:
A kind of particieboard, the particieboard contain above-mentioned E used for shaving board0The environment-friendly modified Lauxite of grade.
By E used for shaving board of the present invention0Particieboard made by the environment-friendly modified Lauxite of grade, content of formaldehyde
It is low, far below the E of plate burst size of methanal0Grade standard (≤5.0mg/100g).
Definition:
Herein, term " formaldehyde " refers to that formaldehyde is usually with formalin from the formalin bought on the market
Form exists, and the mass percent concentration of formaldehyde is 42~48% in formalin.
In term " F/ (U+M) ", the amount of the substance of F formaldehyde, U refers to the amount of the substance of urea, and M refers to the substance of melamine
Amount, therefore, " F/ (U+M) " be the amount of the substance of formaldehyde and the substance of urea and melamine amount and ratio.It is similar
, term " F/U " is the ratio of the amount of the amount of the substance of formaldehyde and the substance of urea.
Herein, term " HEUR " refers to hydrophobically modified ethoxy based polyurethanes (" hydrophobically
modified ethoxylate urethanes").HEUR is a kind of non-ionic polymer, usually poly- containing different length
Glycol glycerin ester units, are connected by carbamic acid, and end is hydrophobic grouping.
Compared with prior art, technical solution of the present invention has the advantages that
(1) in the synthesis technology of environment-friendly modified Lauxite, by applying the preactivated formaldehyde technology of strong acid, adding
At suitable polyvinyl alcohol is added before reaction, the hydroxyl in polyvinyl alcohol molecule, which can carry out reacting with formaldehyde, generates a part of poly- second
Enol formal, reduces the content of diether linkage structure in resin, therefore reduces the content of free formaldehyde；
(2) it is big to react generation for the methylolurea that the hydroxyl in polyvinyl alcohol molecule can also be generated with Lauxite reaction process
The condensation polymer of molecular weight, this can be such that the bonding force of Lauxite is improved, while reduce the generation of Lauxite reaction process
Methylolurea content, also just reduce the burst size of formaldehyde；
(3) polyvinyl alcohol itself is linear polymer, has good toughness and elasticity, can be embedded in ureaformaldehyde tree
In rouge macromolecular, improve the structure of Lauxite, improves the pre-compressed effect of Lauxite.
(4) in the synthesis technology of environment-friendly modified Lauxite, suitable melamine is added in the addition reaction stage
The content of free formaldehyde in urea-formaldehyde resin can be reduced.From the point of view of melamine structure, melamine has a cyclic structure, has
Six active groups can largely promote the crosslinking of Lauxite using cyanurotriamide modified urea resin, be formed
Tridimensional network, while many water suction groups are closed, to substantially increase the water resistance of Lauxite.
(5) urea of the present invention feeds intake in five times, it has following effect: a. due to using urea is added several times, then adding every time
The amount of urea is than total amount much less, and synthesis molar ratio is big, and reaction heat is few, and reaction speed is slow, reacts easy to control；B. in the addition stage
A certain number of dihydroxy ureas are produced, the curing rate and storage stability that improve Lauxite are conducive to；C. it can make urea
It is sufficiently reacted with formaldehyde, particularly the addition of last batch of urea is conducive to capture unreacted formaldehyde in resin, so as to have
Effect reduces the free formaldehyde content of prepared environment-friendly modified Lauxite, reaches and substantially improves production environment and use ring
The purpose in border.Reinforcing agent is added simultaneously, the water resistance of synthesized resin can be effectively enhanced, to improve wood shavings slab products
Interior bonding strength, the glue performances such as surface bonding intensity.
(6) present invention synthesizes the resin due to using high-concentration formaldehyde, prepares under the conditions of popular response temperature
Non- dehydration E0The environment-friendly modified Lauxite of level shaving board, have technological specification, easy to operate, non-environmental-pollution, it is easy to implement,
The features such as at low cost, reaching reduces energy consumption, the requirement of the clean manufacturing of no wastewater discharge.
In short, the method for synthesis environment-friendly modified Lauxite used for shaving board of the present invention uses the height of low mole prop0rtion
Concentration formaldehyde and urea are primary raw material, and polyvinyl alcohol, melamine and reinforcing agent is added and is modified to Lauxite, passes through
Synthesis technology is precisely controlled, and eliminates vacuum dewatering technique process, so that not only content of formaldehyde is low, pre- for the Lauxite of preparation
Good performance, interior bonding strength and surface bonding intensity height are pressed, and at low cost.
Specific embodiment
To better illustrate the object, technical solutions and advantages of the present invention, the present invention is made combined with specific embodiments below
It further illustrates.
Embodiment 1
E used for shaving board of the present invention0One embodiment of the environment-friendly modified Lauxite of grade.In the present embodiment,
The synthesis of the Lauxite the following steps are included:
(1) formaldehyde is put into reaction kettle, stirred, adjust pH=3.0 with acid, and be warming up to 45 DEG C, polyvinyl alcohol, heat preservation is added
35 minutes；
(2) first batch urea is added, keeps the temperature 35 minutes at 45 DEG C；
(3) plus alkali adjusts pH=7.0~7.5, and second lot urea and melamine are mixed in investment reaction kettle；
(4) 90 DEG C are warming up to, timing keeps the temperature 60 minutes, checks pH >=6.5；
(5) cool down 83 DEG C, acid adding adjusting pH=4.8~5.2, progress polycondensation to cp/30 DEG C of target viscosities 150~180,
Terminate reaction；
(6) cool down, add adjusting PH with base=6.0~6.3, reaction kettle is added in third batch urea, keep the temperature 35 points at 82 DEG C
Clock adds adjusting PH with base=6.6~7.0, cooling；
(7) 65 DEG C are cooled to, reaction kettle is added in the 4th batch urea, reacted 30 minutes；
(8) 55 DEG C are cooled to, reaction kettle is added in the 5th batch urea, is reacted 30 minutes；
(9) plus alkali adjustment pH=7.5~8.0 continue to be cooled to 35 DEG C of dischargings in 45 DEG C of addition reinforcing agents；
Wherein, the concentration of the formaldehyde is 50%；The alkali is the triethanolamine solution that mass percent concentration is 99%；
In the step (1), the acid is the hydrochloric acid solution that mass percent concentration is 20%；In the step (5), the acid
The formic acid solution for being 20% for mass percent concentration；The polyvinyl alcohol is the polyvinyl alcohol of model 20-99；The reinforcing agent
For the RM-12W polyurethanes association type rheology modifier of Rhom and Hass's production；
The parts by weight of the formaldehyde are 45 parts, and the parts by weight of the urea are 40 parts, the weight of the melamine
Number is 2 parts, and the parts by weight of the polyvinyl alcohol are 0.05 part, and the parts by weight of the reinforcing agent are 0.2 part；Wherein, institute
The parts by weight for stating first batch urea to the 5th batch urea are respectively 4 parts, 15 parts, 12 parts, 6 parts and 3 parts.
Embodiment 2
E used for shaving board of the present invention0One embodiment of the environment-friendly modified Lauxite of grade.In the present embodiment,
The synthesis of the Lauxite the following steps are included:
(1) formaldehyde is put into reaction kettle, stirred, with strong acid tune pH=3.0, and be warming up to 55 DEG C, polyvinyl alcohol is added, protected
Temperature 25 minutes；
(2) first batch urea is added, keeps the temperature 25 minutes at 55 DEG C；
(3) plus alkali adjusts pH=7.0~7.5, and second lot urea and melamine are mixed in investment reaction kettle；
(4) 92 DEG C are warming up to, timing keeps the temperature 40 minutes, checks pH >=6.5；
(5) cool down 93 DEG C, acid adding adjusting pH=4.8~5.2, progress polycondensation to cp/30 DEG C of target viscosities 150~180,
Terminate reaction；
(6) cool down, add adjusting PH with base=6.0~6.3, reaction kettle is added in third batch urea, keep the temperature 25 points at 85 DEG C
Clock adds adjusting PH with base=6.6~7.0, cooling；
(7) 75 DEG C are cooled to, reaction kettle is added in the 4th batch urea, reacted 18 minutes；
(8) 65 DEG C are cooled to, reaction kettle is added in the 5th batch urea, is reacted 18 minutes；
(9) plus alkali adjustment pH=7.5~8.0 continue to be cooled to 45 DEG C of dischargings in 55 DEG C of addition reinforcing agents；
Wherein, the concentration of the formaldehyde is 44%；The alkali is the sodium hydroxide solution that mass percent concentration is 30%；
In the step (1), the acid is the hydrochloric acid solution that mass percent concentration is 20%；In the step (5), the acid
The ammonium chloride solution for being 20% for mass percent concentration；The polyvinyl alcohol is the polyvinyl alcohol of model 20-99；The enhancing
Agent is HEUR；
The parts by weight of the formaldehyde are 52 parts, and the parts by weight of the urea are 68 parts, the weight of the melamine
Number is 4 parts, and the parts by weight of the polyvinyl alcohol are 0.10 part, and the parts by weight of the reinforcing agent are 0.4 part；Wherein, institute
The parts by weight for stating first batch urea to the 5th batch urea are respectively 6 parts, 20 parts, 18 parts, 12 parts and 8 parts.
Embodiment 3
E used for shaving board of the present invention0One embodiment of the environment-friendly modified Lauxite of grade.In the present embodiment,
The synthesis of the Lauxite the following steps are included:
(1) formaldehyde is put into reaction kettle, stirred, with strong acid tune pH=3.0, and be warming up to 50 DEG C, polyvinyl alcohol is added, protected
Temperature 30 minutes；
(2) first batch urea is added, keeps the temperature 30 minutes at 50 DEG C；
(3) plus alkali adjusts pH=7.0~7.5, and second lot urea and melamine are mixed in investment reaction kettle；
(4) 90 DEG C are warming up to, timing keeps the temperature 50 minutes, checks pH >=6.5；
(5) cool down 88 DEG C, acid adding adjusting pH=4.8~5.2, progress polycondensation to cp/30 DEG C of target viscosities 150~180,
Terminate reaction；
(6) cool down, add adjusting PH with base=6.0~6.3, reaction kettle is added in third batch urea, keep the temperature 30 points at 85 DEG C
Clock adds adjusting PH with base=6.6~7.0, cooling；
(7) 70 DEG C are cooled to, reaction kettle is added in the 4th batch urea, reacted 20 minutes；
(8) 60 DEG C are cooled to, reaction kettle is added in the 5th batch urea, is reacted 20 minutes；
(9) plus alkali adjustment pH=7.5~8.0 continue to be cooled to 40 DEG C of dischargings in 50 DEG C of addition reinforcing agents；
Wherein, the concentration of the formaldehyde is 48%；The alkali is the sodium hydroxide solution that mass percent concentration is 20%；
In the step (1), the acid is the sulfuric acid solution that mass percent concentration is 20%；In the step (5), the acid
The ammonium sulfate for being 20% for mass percent concentration；The polyvinyl alcohol is the polyvinyl alcohol of model 20-99；The enhancing
Agent is the RM-12W polyurethanes association type rheology modifier of Rhom and Hass's production；
The parts by weight of the formaldehyde are 47.4 parts, and the parts by weight of the urea are 49.37 parts, the melamine
Parts by weight are 2.9 parts, and the parts by weight of the polyvinyl alcohol are 0.08 part, and the parts by weight of the reinforcing agent are 0.3 part；Its
In, the parts by weight of first batch urea to the 5th batch urea be respectively 4.1 parts, 17.07 parts, 16.7 parts, 8.4 parts and
3.1 part.
Embodiment 4:
E used for shaving board of the present invention0The quality index of the environment-friendly modified Lauxite of grade is as shown in table 1 below:
Table 1
The detection of the above indices be according to national standards GB/T 14732-2006 timber industry adhesive ureaformaldehyde,
Phenolic aldehyde, melamine resin and GB/T 14074-2006 wood adhesive and its resin method of inspection carry out.
As can be seen from Table 1, E used for shaving board of the present invention0The environment-friendly modified urea-formaldehyde resin solids content of grade is high,
Free formaldehyde content is low.Usual resins are generally used 37% commercially available formaldehyde, improve solid by vacuum dehydration in synthesis process
Content is just able to satisfy the technique requirement of particieboard, and there are synthesis process energy consumption height, solid content fluctuations greatly, the waste water of abjection needs specially
The problem of processing.Distinctive feature of the invention is to be added before addition reaction by applying the preactivated formaldehyde technology of strong acid
Appropriate melamine is added in the addition reaction stage, then is transferred to solutions of weak acidity to make itself and urea, formaldehyde in suitable polyvinyl alcohol
Sufficiently copolymerization, reinforcing agent is added in the phase in post synthesis, to improve E0The comprehensive performance of the environment-friendly modified Lauxite of level shaving board
And stability, it realizes the low advantage of similar adhesive cost of material, non-dehydration E is prepared under the conditions of popular response temperature0Grade
The environment-friendly modified Lauxite of particieboard.
Technique of the invention, which is precisely controlled, to be embodied in: the pH value of general formalin needs to use strong acid between 4.3-4.8
PH value is adjusted, achievees the purpose that activate formaldehyde, by preferably thinking at pH=3.0,30 minutes time process conditions, first
The acetal effect of aldehyde and polyvinyl alcohol is preferable；This technique is to reduce cost, as much as possible in the case where ensuring Adhensive performance
The additional amount for reducing melamine thinks that less amount of melamine is best in synthesis phase addition effect by optimization；This hair
Bright F/ (U+M) < 0.95, and the additional amount of melamine is below 4%, performance (such as glue-joint strength, water resistance, ageing-resistant
Property, storage stability etc.) all declined, improve its performance to meet requirement, through excessive by the way that reinforcing agent is added thus
The experiment of amount, for inventor's discovery when the aqueous association type rheology modifier of 0.2-0.4% is added, can reach improves adhesive
The purpose of energy, while also found that the reinforcing agent also has facilitation to plate burst size of methanal is reduced, it is detailed in the following table 2.
Embodiment 5:
The present embodiment, which has detected performance of the reinforcing agent on modified urea-formaldehyde resin of the present invention for plate compacting, to be influenced, knot
Fruit is as shown in table 2 below:
Table 2
Remarks: in upper table 3, A scheme is synthesis modification Lauxite according to the method described in the present invention, B scheme and the side A
The difference of case is only that during the preparation process A scheme joined reinforcing agent, and reinforcing agent is not added for B scheme.In the present embodiment
In, the reinforcing agent is the RM-12W polyurethanes association type rheology modifier of Rhom and Hass's production, but when use
When HEUR is as reinforcing agent, it may have similar effect.
As can be seen from the above table, the Testing index of A scheme reaches and is better than in GB/T 4897-2015 national standard dry
The regulation of the furniture shaving board physical and mechanical property requirement used under state, due to there is extremely micro trip in plate obtained
From formaldehyde, there is Anti-moth-eating or fungi-proofing effect, performance is better than formaldehydeless wood-based plate.Although B scheme burst size of methanal is up to standard,
But other performances are poor.
Finally, it should be noted that the above embodiments are merely illustrative of the technical solutions of the present invention rather than protects to the present invention
The limitation of range is protected, although the invention is described in detail with reference to the preferred embodiments, those skilled in the art should
Understand, it can be with modification or equivalent replacement of the technical solution of the present invention are made, without departing from the essence of technical solution of the present invention
And range.
Claims (6)
1. a kind of E0 used for shaving board grades of environment-friendly modified Lauxites, which is characterized in that the raw material including following parts by weight: first
45~52 parts of aldehyde, 40~68 parts of urea, 2~4 parts of melamine, 0.05~0.10 part of polyvinyl alcohol, rheology modifier 0.2~
0.4 part, the polyurethanes of suitable bronsted lowry acids and bases bronsted lowry, the RM series that the rheology modifier is HEUR and Rhom and Hass produces is formed
At least one of mould assembly rheology modifier.
2. E0 used for shaving board grades of environment-friendly modified Lauxites according to claim 1, which is characterized in that the formaldehyde is
The formalin that mass percent concentration is 44~50%.
3. E0 used for shaving board grades of environment-friendly modified Lauxites according to claim 1 or 2, which is characterized in that the first
The parts by weight of aldehyde are 47.5 parts, and the parts by weight of the urea are 49.37 parts, and the parts by weight of the melamine are 2.9
Part, the parts by weight of the polyvinyl alcohol are 0.08 part, and the parts by weight of the rheology modifier are 0.3 part.
4. E0 used for shaving board grades of environment-friendly modified Lauxites according to claim 1, which is characterized in that the modified urea
The viscosity of urea formaldehyde is 150~300cp/23 DEG C.
5. the preparation method of E0 grades of environment-friendly modified Lauxite used for shaving board described in a kind of any one of Claims 1 to 4,
The following steps are included:
(1) formaldehyde is put into reaction kettle, stirred, adjust pH=3.0 with acid, and be warming up to 45~55 DEG C, polyvinyl alcohol, heat preservation is added
25~35 minutes；
(2) first batch urea is added, keeps the temperature 25~35 minutes at 45~55 DEG C；
(3) plus alkali adjusts pH=7.0~7.5, and second lot urea and melamine are mixed in investment reaction kettle；
(4) 90~92 DEG C are warming up to, timing keeps the temperature 40~60 minutes, keeps pH >=6.5；
(5) 83~88 DEG C are cooled to, acid adding adjusts pH=4.8~5.2, carries out polycondensation to 150~180cp/30 DEG C of target viscosities
When, terminate polycondensation reaction；
(6) cool down, add adjusting PH with base=6.0~6.3, reaction kettle is added in third batch urea, keep the temperature 25~35 at 82~85 DEG C
Minute, add adjusting PH with base=6.6~7.0, cools down；
(7) 65~75 DEG C are cooled to, reaction kettle is added in the 4th batch urea, reacted 18~30 minutes；
(8) 55~65 DEG C are cooled to, reaction kettle is added in the 5th batch urea, is reacted 18~30 minutes；
(9) plus alkali adjustment pH=7.5~8.0 continue to be cooled to 35~45 DEG C of dischargings in 45~55 DEG C of addition rheology modifiers；
Wherein, the amount of the first batch urea is the 5.9~15.0% of urea total amount, and the amount of the second lot urea is urine
The 22.1~50.0% of plain total amount, the amount of the third batch urea are the 17.6~45.0% of urea total amount, described 4th batch
The amount of secondary urea is the 8.8~30.0% of urea total amount, the amount of the 5th batch urea be urea total amount 4.4~
20.0%.
6. a kind of particieboard, the particieboard contains E0 grades of environment-friendly type used for shaving board synthesized by Claims 1 to 5 any one
Modified urea-formaldehyde resin.
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