CN109851735A - A kind of manufacturing method of low melamine amount modified urea-formaldehyde resin and its application in MDF production - Google Patents
A kind of manufacturing method of low melamine amount modified urea-formaldehyde resin and its application in MDF production Download PDFInfo
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Abstract
The invention belongs to the mating auxiliary material technical fields of fiberboard, are related to a kind of manufacturing method of low melamine amount modified urea-formaldehyde resin, using " alkali-Acid-Base-alkali " synthesis technology, formaldehyde, which divides 2 times, to feed intake, it feeds intake for urea points 3 times, feeds intake for melamine 1 time, be synthetically prepared；Whole preparation process is divided into alkaline addition reaction, an acid polycondensation, alkali secondary polycondensation and alkalinity post-processing four-stage.Synthesis step of the present invention is simple, monitors reaction process by control pH and viscosity, simple to operate.Obtained low melamine amount modified urea-formaldehyde resin, pH value 8.5~9.5,16~18s of viscosity, solid content 52~56%.It also discloses and adds the application of made low melamine amount modified urea-formaldehyde resin in impregnation process in MDF production, because of glue-joint strength height, completion of cure when hot pressing, physical and mechanical property and water resistance of fiberboard etc. enhance.Fibreboard Production cost can be reduced, hot pressing time is reduced, improves the performances such as the internal bond strength of fiberboard.
Description
Technical field
The invention belongs to the mating auxiliary material technical fields of fiberboard, are related to fiber board adhesive more particularly to a kind of low trimerization
The manufacturing method of cyanamide amount modified urea-formaldehyde resin and its application in MDF production.
Background technique
Medium density fibre board (MDF) (medium density fiberboard, MDF) is with wood fibre or other plant fiber
For raw material, through fiber preparation, apply synthetic resin, plate made of suppressing in the case where heating pressurized conditions.China's Forest Resources are tight
, when producing fiberboard, surplus material is mostly cut down with small firewood material, forest zone and processes " three surplus materials " such as remaining materials as raw material, by chipping,
Chip washing, fiber separation, pipeline sizing, fiber drying, is mated formation, hot-forming and sanding post-treating and other steps at thermophilic digestion
It is fabricated.Fiberboard is uniform in material, breadth is broad, stable structure, high mechanical properties, can carry out machining or veneer adds
Work is widely used in the industries such as furniture, indoor decoration, packaging, sound equipment, car and boat manufacture.
National Specification: indoor fiberboard must reach E1Grade standard, burst size of methanal are less than 8.0mg/100g
(perforation method).In the higher fiberboard of production environmental protection grade, need to reduce the molar ratio of synthetic resin, free formaldehyde in resin
Content reduces, and guarantees that the burst size of methanal of fiberboard meets the requirements.But using common synthetic technology of resins, molar ratio
Decline can bring following adverse effect: the water-soluble decline of adhesive, curing time extend, and storage period is short, and cohesive force is small.Use this
The fiberboard of kind of production of resins, is difficult to stability contorting in production process, the physical and mechanical property decline of plate, for example, in combine it is strong
Degree, thickness swelling rate etc..When therefore, using the production of resins fiberboard of low mole prop0rtion, need to add during synthetic resin
Enter a large amount of melamine and carrys out modified urea-formaldehyde resin, to improve crosslinking and the water resistance of resin, guarantee plate property is up to standard,
But the production cost that will lead to resin in this way sharply increases.
Summary of the invention
In view of the above-mentioned deficiencies in the prior art, the purpose of the present invention is disclose a kind of low melamine amount modified urea
The manufacturing method of urea formaldehyde and its application in MDF production.
In order to solve the above-mentioned technical problem, the present invention is implemented as follows:
The production method of low melamine amount modified urea-formaldehyde resin disclosed in this invention is closed using " alkali-Acid-Base-alkali "
It at technique, feeds intake for formaldehyde points 2 times, feeds intake for urea point 3 times, feed intake for melamine 1 time, be synthetically prepared；Whole preparation process
It is divided into alkaline addition reaction, an acid polycondensation, alkali secondary polycondensation and alkalinity 4 stages of post-processing.
A kind of manufacturing method of low melamine amount modified urea-formaldehyde resin, includes the following steps:
A, into first time formaldehyde in reaction kettle, 35~40 DEG C are warming up to, soda bath tune pH to 8.4~8.6 is added；
B, it being added after first time urea and closes steam when being warming up to 80 DEG C immediately, automatic heating is to 95 DEG C, pH value 7.5~7.7,
The molar ratio of first time formaldehyde and first time urea is 2.0~2.2 at this time；
C, in 95 DEG C of heat preservations 20~22min, preferably 20min, the pH value 7.4~7.5 of system, 10.0~11.0s of viscosity；
D, 85~88 DEG C are cooled to, formic acid solution tune pH value is added to 4.4~4.6, is reacted at 92~94 DEG C, this stage
Terminal viscosity is in 16.0~17.0s；
E, with soda bath tune pH value to 8.5~9.0, fast cooling is added after second of formaldehyde to 90~92 DEG C to burn
Aqueous slkali tune pH value to 9.0~9.3, the molar ratio of (+second formaldehyde of first time the formaldehyde)/first time urea 2.2~
2.4；
F, melamine being added and second of urea, reaction system is warming up to 88 DEG C, melamine dissolves in temperature-rise period,
PH value 7.7~7.9,18.0~19.0s of viscosity, (+second formaldehyde of first time formaldehyde)/[(first time urea+second
Urea)+melamine)] molar ratio be 1.6~1.8；
G, 87~89 DEG C of Yu Wendu, pH value 7.7~8.0 are reacted, and every 5~10min surveys a viscosity, the stage terminal viscosity
In 20.0~22.0s；
H, plus soda bath tune pH value is to 9.5~9.8, while cooling to 70 DEG C, third time urea is added, to third
Secondary urea all dissolves, and continues to adjust pH value to 8.8~9.5；
I, 40 DEG C are cooled to, pH value 8.8~9.5,15.5~17.5s of viscosity discharges.
In the raw material of the present invention for participating in reaction, the molar ratio of the sum of formaldehyde and urea and melamine 0.8~
1.2, the quality of melamine accounts for 1% of resin quality or more.
In the more excellent disclosed example of the present invention, viscosity test is detected using applying -4 glasss；30 DEG C of viscosity procedural test temperature, viscosity
25 DEG C of terminal test temperature, when pH value is tested, 35 DEG C of temperature.
Low melamine amount modified urea-formaldehyde resin obtained by the present invention: pH value 8.5~9.5,16~18s of viscosity, solid
Content 52~56%.
The invention has the characteristics that
1, it is different from existing synthetic technology of resins and is added at one time formaldehyde, be divided to two for formaldehyde when synthetic resin of the present invention
Secondary addition.Formaldehyde generates sufficient amount of dimethylol urea at synthesis initial stage and a urea under weak basic condition, with
Initial stage Lauxite in acid condition afterwards, enhances the bonding force of resin.Secondary formaldehyde adds after a polycondensation reaction
Enter, significantly improve the content of formaldehyde in synthesis mid-term resin, is conducive to generate the higher resin of the degree of cross linking.
2, when synthetic resin, using cyanurotriamide modified urea resin, melamine is added after a polycondensation reaction.Three
Poly cyanamid has ring structure, and there are six active groups.It is added after a polycondensation reaction, is reacted with urea, formaldehyde and generate MUF
Resin largely promotes the crosslinking of adhesive, forms tridimensional network, closes a large amount of water suction groups, mentions significantly
The high water resistance and adhesive property of adhesive, can produce the fiberboard of high quality, the water suction for significantly reducing fiberboard is thick
Spend expansion rate performance；
3, urea is added in three times during synthetic resin.Urea is added by several times, the synthesis of each stage of resins synthesis rubs
You are than big, and reaction heat is few, and reaction speed is slow, and reaction is easy to control.Greater number of dihydroxy first is produced in the addition reaction stage
Base urea is conducive to the curing rate and storage stability that improve resin.In addition, urea is added by several times, keep urea and formaldehyde abundant
Reaction, advantageously reduces the free formaldehyde in resin.
Another object of the present invention is that disclosing the glutinous agent of the low melamine amount modified urea-formaldehyde resin glue exists
Application in MDF production.
Specifically, Fibreboard Production process mainly has: log debarking, chip, wood chip screening, washing, pre-cooked, boiling,
Defibrator process, impregnation, drying, fiber sort, mat formation, precompressed, hot pressing, turnover panel cooling, stacking health, sanding, cutting, product inspection,
Packaging and warehousing.
In the more excellent disclosed example of the present invention, in the impregnation process, apply adhesive, curing agent and drop in fiber blow-off pipe
Aldehyde agent, wherein the adhesive is low melamine amount modified urea-formaldehyde resin, applied amount hard resin and bone dry fiber weight
Percentage 10~12%；The curing agent be ammonium sulfate, additive amount relative to over dry glue weight 1.5~2%.
In the more excellent disclosed example of the present invention, in the drying process, by impregnation treated fiber moisture it is dry to 9~
10%, by pneumatic separation, removal of impurities, acceptable fiber enters process of mating formation.
Compared with producing the fiberboard of performance requirement of the same race using common adhesive, used low melamine amount is modified
Lauxite, melamine additive amount is less when synthetic resin, and the production cost of adhesive reduces；Due to the friendship of such adhesive
It is high to join performance, cohesive force is strong, and resin added reduces by 10~20kg/m than original when producing fiberboard3, the production cost drop of fiberboard
It is low.
Using low melamine amount modified urea-formaldehyde resin, plastic bonding performance is good, stable production process and is easy to control, plate
Base hot pressing time is reduced, and yield and yield rate improve, and production efficiency improves.When hot pressing slab, resin solidification is complete, the object of plate
Reason mechanical property, especially internal bond strength obtain larger raising；Thickness swelling rate reduces, and is not easy in use
The problems such as recurring structure deformation and moisture expantion.
Beneficial effect
Synthesis step of the present invention is simple, monitors reaction process by control pH and viscosity, simple to operate.Using this
Low melamine amount modified urea-formaldehyde resin made from invention disclosed method can reduce the production cost of fiberboard, and production process is steady
Determine and be easy to control, reduce slab hot pressing time, improves production efficiency, improve the physical and mechanical property and water resistance of fiberboard
Deng.
Specific embodiment
The following describes the present invention in detail with reference to examples, so that those skilled in the art more fully understand this hair
It is bright, but the invention is not limited to following embodiments.
Unless otherwise defined, term (including scientific and technical terminology) used herein above should be construed as having as belonging to the present invention
The identical meaning that those skilled in the art are commonly understood by.It will also be understood that term used herein above should be explained
To have the meaning consistent with their meanings in the content of this specification and the relevant technologies, and should not be with idealization
Or excessive form is explained, unless expressly so limiting here.
Embodiment 1
1, the production method of low melamine amount modified urea-formaldehyde resin
The amount of melamine accounts for the 4.5% of weight resin, and the molar ratio control of the sum of formaldehyde and urea and melamine exists
0.86；It feeds intake for formaldehyde points 2 times, 3 batches, urea point feeds intake, and feeds intake for melamine 1 time.
Preparation process is as follows:
A, into first time formaldehyde in reaction kettle, when being warming up to 38~40 DEG C, soda bath tune pH to 8.4~8.6 is added；
B, first time urea (molar ratio of formaldehyde and urea is 2.06) is added, pass when steam is warming up to 80 DEG C is opened after adding
Steam, automatic heating survey pH value to 95 DEG C；
C, 20 minutes are kept the temperature at 95 DEG C, surveys pH value and viscosity, pH value: 6.3~6.5；
D, 85~88 DEG C are cooled to, formic acid solution tune pH value is added to 4.5~4.6, is reacted at 92~94 DEG C, surveys pH value
And viscosity, the stage terminal viscosity were controlled at 16.0~17.0 seconds；
E, after reaching viscosity, add soda bath tune pH value to 8.5~9.0, fast cooling is added second to 90~92 DEG C
Formaldehyde (molar ratio of formaldehyde and urea is 2.26), adds soda bath tune pH value to 9.0~9.3；
F, second of urea and melamine is added, and (molar ratio of the sum of formaldehyde and urea and melamine exists at this time
1.65), while 86 DEG C being warming up to.Check that melamine dissolves situation, surveys pH value and viscosity in temperature-rise period；
G, at 85~89 DEG C of temperature, pH=7.7~8.0 are lower to react, the viscosity of survey in every 5~10 minutes, the stage terminal
Viscosity was controlled at 20.0~22.0 seconds；
H, plus soda bath tune pH value is to 9.5~9.8, cools simultaneously.70 DEG C are cooled to, third time urea is added
(molar ratio of the sum of formaldehyde and urea and melamine is 1.10 at this time).It is all dissolved to third time urea, surveys pH value and glue
Degree adjusts pH value to 8.8~9.5；Continue to be cooled to 40 DEG C, pH value and viscosity are surveyed in sampling, out resin.
Low melamine amount modified urea-formaldehyde resin pH value obtained by the present embodiment: 8.8~9.5, viscosity: 16.5~
18.5s, solid content: 54~55%.
7.7mmE0 grade fibre board manufacturing process
It is produced by the producing principle of general fibre plate and process flow.After timber peeling, be made after sliced it is long by 15~
20mm, 15~20mm, the wood chip that thickness is 3~4mm filter out size in the qualification wood of 4~55mm by wood chip Screening Treatment
Piece, then washed, silt and metal impurities are removed, guarantee the cleaning of wood chip；Soften wood chip, cooking pressure by boiling
8.9bar, digestion time 4min；Wood chip is threaded into defibrator by discharging, while to adding melt paraffin, paraffin in grinding machine
Applied amount about 1.5% (opposite and bone dry fiber), abrasive disk space grind chamber pressure 8.2bar in -3mm or so；It is sprayed in fiber
Apply novel low melamine amount modified urea-formaldehyde resin glue on pipeline and stick agent, resin added is 210~215kg/m3, curing agent sulfuric acid
Ammonium additive amount is 2% (relative to over dry glue weight)；Through drying system that fiber moisture is dry to 9~10%, fiber passes through
Enter molding of mating formation after sorting；Weight of mating formation is adjusted, guarantees 860~870kg/m of slab density3；Enter hot pressing after slab precompressed
Machine carries out hot pressing under the conditions of 180-230 DEG C of temperature, using 5 sections of temperature subregions: 230 DEG C, 228 DEG C, 208 DEG C, 188 DEG C, 180
℃.Hot pressing pressure distribution: entrance pressure rises to 3.0~3.5MPa, and rebound section pressure is gradually down to 1.4~1.8MPa, sandwich layer
Soaking zone gradually drops to 0.10~0.18MPa, 1.5~1.7MPa of fixed thickness section pressure.Using above-mentioned hot pressing temperature and pressure, pressure
Machine speed 510-520mm/s；The plate of press health 48h after turnover panel is cooling carries out sanding processing, the 4 sanding sand amounts of cutting point out
With as follows: first of sand amount of cutting accounts for 55~60% (30~40 mesh abrasive bands), the second sand amount of cutting accounts for 20~25% (50~60 mesh sand
Band), the third road sand amount of cutting accounts for 10~15% (80~100 mesh abrasive bands), the 4th sand amount of cutting accounts for 5~10% (120~150 mesh sand
Band)；Substrate sorting after sanding is packed in storage after examining.
The 7.7mmE0 grade fibre board produced through above step, is detected by GB/T 11718-2009 standard requirements, is tied
Fruit such as the following table 1:
Table 1
Embodiment 2
1, the production method of low melamine amount modified urea-formaldehyde resin
The amount of melamine accounts for the 1.1% of weight resin, mole of the sum of formaldehyde and polyvinyl alcohol, urea and melamine
Than controlling 1.04；It feeds intake for formaldehyde points 2 times, 3 batches, urea point feeds intake, and feeds intake for melamine 1 time.
Preparation process is as follows:
A, into first time formaldehyde in reaction kettle, when being warming up to 38~40 DEG C, soda bath tune pH to 8.4~8.6 is added；
B, first time urea (molar ratio of formaldehyde and urea is 2.05) is added, pass when steam is warming up to 80 DEG C is opened after adding
Steam, automatic heating survey pH value to 95 DEG C；
C, 20 minutes are kept the temperature at 95 DEG C, surveys pH value and viscosity, pH value: 6.3~6.5；
D, 85~88 DEG C are cooled to, formic acid solution tune pH value is added to 4.4~4.6, is reacted at 92~94 DEG C, surveys pH value
And viscosity, the stage terminal viscosity were controlled at 16.0~17.0 seconds；
E, after reaching viscosity, add soda bath tune pH value to 8.5~9.0, fast cooling is added second to 90~92 DEG C
Formaldehyde (molar ratio of formaldehyde and urea is 2.23), adds soda bath tune pH value to 9.0~9.3；
F, second of urea and melamine is added, and (molar ratio of the sum of formaldehyde and urea and melamine exists at this time
1.65), while 88 DEG C being warming up to.Check that melamine dissolves situation, surveys pH value and viscosity in temperature-rise period；
G, at 87~89 DEG C of temperature, pH=8.0~8.5 are lower to react, the viscosity of survey in every 5~10 minutes, the stage terminal
Viscosity was controlled at 20.0~22.0 seconds；
H, plus soda bath tune pH value is to 9.5~9.8, cools simultaneously.70 DEG C are cooled to, third time urea is added
(molar ratio of the sum of formaldehyde and urea and melamine is 1.22 at this time).It is all dissolved to third time urea, surveys pH value and glue
Degree adjusts pH value to 8.8~9.5；Continue to be cooled to 40 DEG C, pH value and viscosity are surveyed in sampling, out resin.
Low melamine amount modified urea-formaldehyde resin pH value obtained by the present embodiment: 9.0~9.5, viscosity: 17~19s, Gu
Body content: 52~54%.
12mmE1 grade fibre board manufacturing process
It is produced by the producing principle of general fibre plate and process flow.After timber peeling, be made after sliced it is long by 15~
20mm, 15~20mm, the wood chip that thickness is 3~4mm filter out size in the qualification wood of 4~55mm by wood chip Screening Treatment
Piece, then washed, silt and metal impurities are removed, guarantee the cleaning of wood chip；Soften wood chip by boiling, cooking pressure exists
8.5bar, 3.5~4min of digestion time；Wood chip is threaded into defibrator by discharging, while to adding melt paraffin in grinding machine,
Paraffin applied amount about 1.2% (opposite and bone dry fiber), abrasive disk space grind chamber pressure 8.0bar in -3mm or so；It is sprayed in fiber
Apply low melamine amount modified urea-formaldehyde resin glue on pipeline out and stick agent, resin added is 205~210kg/m3, curing agent sulfuric acid
Ammonium additive amount is 1.5%；It is through drying system that fiber moisture is dry to 8~9%, molding of mating formation is entered after sorting；Adjustment paving
Weight is filled, guarantees 840~850kg/m of slab density3；Slab is after precompressed, into continuous hot press.In 180-240 DEG C of temperature
Hot pressing is carried out under the conditions of degree, using 5 sections of temperature subregions: 235 DEG C, 230 DEG C, 212 DEG C, 192 DEG C, 180 DEG C.Hot pressing pressure distribution:
Entrance pressure rises to 2.8~3.3MPa, and rebound section pressure is gradually down to 1.2~1.5MPa, and sandwich layer soaking zone gradually drops to
0.06~0.08MPa, 1.4~1.6MPa of fixed thickness section pressure.Using above-mentioned hot pressing temperature and pressure, press speed 370-380mm/
s；The plate of press health 48h after turnover panel is cooling carries out sanding processing out, and the 4 sanding sand amounts of cutting are allocated as follows: first of sand
The amount of cutting accounts for 55~60% (30~40 mesh abrasive bands), the second sand amount of cutting accounts for 20~25% (50~60 mesh abrasive bands), third road sand is cut
Amount accounts for 10~15% (80~100 mesh abrasive bands), the 4th sand amount of cutting accounts for 5~10% (120~150 mesh abrasive bands)；Base after sanding
Storage is put in storage after material sorting.
The 12mmE1 grade fibre board produced through above step, is detected, as a result by GB/T 11718-2009 standard requirements
Such as the following table 2:
Table 2
The above description is only an embodiment of the present invention, is not intended to limit the scope of the invention, all to utilize this hair
Equivalent structure or equivalent flow shift made by bright specification is applied directly or indirectly in other relevant technical fields,
Similarly it is included within the scope of the present invention.
Claims (9)
1. a kind of manufacturing method of low melamine amount modified urea-formaldehyde resin, which comprises the steps of:
A, into first time formaldehyde in reaction kettle, 35~40 DEG C are warming up to, soda bath tune pH to 8.4~8.6 is added；
B, it is added after first time urea and closes steam when being warming up to 80 DEG C immediately, automatic heating is to 95 DEG C, pH value 7.5~7.7, at this time
The molar ratio of first time formaldehyde and first time urea is 2.0~2.2；
C, in 95 DEG C of 20~22min of heat preservation, the pH value 7.4~7.5 of system, 10.0~11.0s of viscosity；
D, 85~88 DEG C are cooled to, formic acid solution tune pH value is added to 4.4~4.6, is reacted at 92~94 DEG C, this stage terminal
Viscosity is in 16.0~17.0s；
E, with soda bath tune pH value to 8.5~9.0, fast cooling is molten with caustic soda after second of formaldehyde of addition to 90~92 DEG C
Liquid tune pH value is to 9.0~9.3, and the molar ratio of (+second formaldehyde of first time the formaldehyde)/first time urea is 2.2~2.4；
F, melamine is added and second of urea, reaction system is warming up to 88 DEG C, melamine dissolves in temperature-rise period, pH value
7.7~7.9,18.0~19.0s of viscosity, (+second formaldehyde of first time formaldehyde)/[(+second urea of first time urea)
+ melamine)] molar ratio be 1.6~1.8；
G, 87~89 DEG C of Yu Wendu, pH value 7.7~8.0 are reacted, and every 5~10min surveys a viscosity, which exists
20.0~22.0s；
H, plus soda bath tune pH value is to 9.5~9.8, while cooling to 70 DEG C, third time urea is added, to urinate for the third time
Plain all dissolutions, continue to adjust pH value to 8.8~9.5；
I, 40 DEG C are cooled to, pH value 8.8~9.5,15.5~17.5s of viscosity discharges.
2. the manufacturing method of low melamine amount modified urea-formaldehyde resin according to claim 1, it is characterised in that: step C institute
It states in 95 DEG C of heat preservation 20min.
3. the manufacturing method of low melamine amount modified urea-formaldehyde resin according to claim 1, it is characterised in that: participate in reaction
Raw material in, for the molar ratio of the sum of formaldehyde and urea and melamine 1.0~1.2, the quality of melamine accounts for resin quality
1% or more.
4. the manufacturing method of low melamine amount modified urea-formaldehyde resin according to claim 1, it is characterised in that: viscosity test
Using -4 viscosimeters of painting, wherein step C, when step D, step F, step G detection viscosity, 30 DEG C of temperature；Step I detects viscosity
When, 25 DEG C of temperature.
5. the manufacturing method of low melamine amount modified urea-formaldehyde resin according to claim 1, it is characterised in that: synthesis process
In, when pH value is tested, 35 DEG C of temperature.
6. low melamine amount modified urea-formaldehyde resin made from -5 any the methods according to claim 1, it is characterised in that: institute
State resin pH value 8.5~9.5,16~18s of viscosity, solid content 52~56%.
7. a kind of application of low melamine amount modified urea-formaldehyde resin as claimed in claim 6, it is characterised in that: be applied to
The production of MDF.
8. the application of low melamine amount modified urea-formaldehyde resin according to claim 7, it is characterised in that: in MDF production
In impregnation process, apply adhesive, curing agent and formaldehyde reducing agent in fiber blow-off pipe, wherein the adhesive is low melamine
Measure modified urea-formaldehyde resin, the percentage 10~12% of applied amount hard resin and bone dry fiber weight；The curing agent is sulfuric acid
Ammonium, additive amount relative to over dry glue weight 1.5~2%；The additive amount of formaldehyde reducing agent relative to resin liquid weight 2~7%.
9. the application of low melamine amount modified urea-formaldehyde resin according to claim 7, it is characterised in that: in MDF production
It is in drying process, impregnation treated fiber moisture is dry to 9~10%, by pneumatic separation, removal of impurities, acceptable fiber into
Enter process of mating formation.
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| CN110358249A (en) * | 2019-06-21 | 2019-10-22 | 中煤第五建设有限公司 | Low aldehyde type modified urea-formaldehyde resin grouting for water blocking material of a kind of environmental protection and preparation method thereof |
| CN110359119A (en) * | 2019-07-30 | 2019-10-22 | 中原工学院 | A method of circulation acid-base method prepares ureaformaldehyde fiber |
| CN112223480A (en) * | 2020-10-20 | 2021-01-15 | 大亚人造板集团有限公司 | Method for preparing outdoor fiberboard by MUF-MDI glue |
| CN112375523A (en) * | 2020-11-25 | 2021-02-19 | 大亚人造板集团有限公司 | Production process of high-strength high-water-resistance adhesive |
| CN114262418A (en) * | 2021-12-20 | 2022-04-01 | 大亚人造板集团有限公司 | Preparation method of melamine modified urea-formaldehyde resin with ultralow free formaldehyde content and water resistance and application of melamine modified urea-formaldehyde resin to commercial floor base material |
| CN114262418B (en) * | 2021-12-20 | 2024-04-26 | 大亚人造板集团有限公司 | Preparation method of ultra-low free formaldehyde content water-resistant melamine modified urea formaldehyde resin and application of ultra-low free formaldehyde content water-resistant melamine modified urea formaldehyde resin to commercial floor base material |
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| CN110359119A (en) * | 2019-07-30 | 2019-10-22 | 中原工学院 | A method of circulation acid-base method prepares ureaformaldehyde fiber |
| CN112223480A (en) * | 2020-10-20 | 2021-01-15 | 大亚人造板集团有限公司 | Method for preparing outdoor fiberboard by MUF-MDI glue |
| CN112375523A (en) * | 2020-11-25 | 2021-02-19 | 大亚人造板集团有限公司 | Production process of high-strength high-water-resistance adhesive |
| CN114262418A (en) * | 2021-12-20 | 2022-04-01 | 大亚人造板集团有限公司 | Preparation method of melamine modified urea-formaldehyde resin with ultralow free formaldehyde content and water resistance and application of melamine modified urea-formaldehyde resin to commercial floor base material |
| CN114262418B (en) * | 2021-12-20 | 2024-04-26 | 大亚人造板集团有限公司 | Preparation method of ultra-low free formaldehyde content water-resistant melamine modified urea formaldehyde resin and application of ultra-low free formaldehyde content water-resistant melamine modified urea formaldehyde resin to commercial floor base material |
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