CN110003829A - A kind of preparation method of environment-friendly modified urea-formaldehyde resin adhesive - Google Patents
A kind of preparation method of environment-friendly modified urea-formaldehyde resin adhesive Download PDFInfo
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- CN110003829A CN110003829A CN201910235644.1A CN201910235644A CN110003829A CN 110003829 A CN110003829 A CN 110003829A CN 201910235644 A CN201910235644 A CN 201910235644A CN 110003829 A CN110003829 A CN 110003829A
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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
- C08G12/04—Condensation polymers of aldehydes or ketones with only compounds containing hydrogen attached to nitrogen of aldehydes with acyclic or carbocyclic compounds
- C08G12/10—Condensation polymers of aldehydes or ketones with only compounds containing hydrogen attached to nitrogen of aldehydes with acyclic or carbocyclic compounds with acyclic compounds having the moiety X=C(—N<)2 in which X is O, S or —N
- C08G12/12—Ureas; Thioureas
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J11/00—Features of adhesives not provided for in group C09J9/00, e.g. additives
- C09J11/02—Non-macromolecular additives
- C09J11/04—Non-macromolecular additives inorganic
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J161/00—Adhesives based on condensation polymers of aldehydes or ketones; Adhesives based on derivatives of such polymers
- C09J161/20—Condensation polymers of aldehydes or ketones with only compounds containing hydrogen attached to nitrogen
- C09J161/22—Condensation polymers of aldehydes or ketones with only compounds containing hydrogen attached to nitrogen of aldehydes with acyclic or carbocyclic compounds
- C09J161/24—Condensation polymers of aldehydes or ketones with only compounds containing hydrogen attached to nitrogen of aldehydes with acyclic or carbocyclic compounds with urea or thiourea
Abstract
The invention belongs to adhesive technology fields, and in particular to a kind of preparation method of environment-friendly modified urea-formaldehyde resin adhesive.The present invention prepares modified hydrotalcite by coprecipitation using titanate esters and Dopamine as modifying agent, is used to prepare environment-friendly modified urea-formaldehyde resin adhesive as additive.Environment-friendly modified urea-formaldehyde resin adhesive free formaldehyde content prepared by the present invention is low and has excellent glue-joint strength, and shear strength reaches as high as 2.68MPa；The glued board burst size of methanal of environment-friendly modified urea-formaldehyde resin adhesive preparation is only 0.019mg/L, may be directly applied to interior, safety and environmental protection.
Description
Technical field
The invention belongs to adhesive technology fields, and in particular to a kind of preparation side of environment-friendly modified urea-formaldehyde resin adhesive
Method.
Background technique
Lauxite (UF) is the higher, solidification rate with glue-joint strength as made of urea (U) and formaldehyde (F) polycondensation
Comparatively fast, operating characteristics preferably, lower production costs and abundant raw material the advantages that being easy to get, thus be widely used.However,
That there are still water resistances is poor by UF, cured glue layer brittleness is larger, ageing-resistant performance is not good enough and free F content is higher etc. lacks
Point.
The UF and its adhesive that glue-joint strength is high, free formaldehyde content is few how are prepared at present, are the research fields
Technical bottleneck.Currently, domestic and foreign scholars have conducted extensive research in terms of the synthesis of low content of free formaldehyde UF, a variety of drops are had found
The method of low content of free formaldehyde content.The source analysis generated from formaldehyde, the most effective approach for reducing free formaldehyde are to reduce n (first
Aldehyde): n (urea) ratio (utilization rate for improving formaldehyde), addition formaldehyde catching agent and adsorbent (reduce composite decomposition type formaldehyde
Content) and UF is modified.In the reaction process of synthesis UF, structure, the object of n (formaldehyde): n (urea) ratio and UF
Rationality energy etc. is closely related；In general, n (formaldehyde): n (urea) ratio is smaller, and free formaldehyde content is fewer, but UF adhesive
Glue-joint strength is substantially reduced.Porous montmorillonite or active carbon are common formaldehyde adsorbent, but such adsorbent exists centainly
Defect i.e. with urea-formaldehyde resin adhesive poor compatibility, and later period formaldehyde absorbing the phenomenon that there are adsorption saturations.
Formaldehyde degradation by photocatalytic oxidation process is another important channel for reducing free formaldehyde in urea-formaldehyde resin adhesive, is such as used
TiO2It is used to catalytic degradation formaldehyde as additive；But its effect is limited, Sino-South African Forestry University of Science and Technology Liu Wenjie et al. (China
Adhesive, 2018,27 (10): 563-567, melamine/nano-TiO2Combined modified urea-formaldehyde resin adhesive research) with nanometer
TiO2It is that modifying agent synthesizes Lauxite with melamine, free formaldehyde content is still 0.41%.
So urea-formaldehyde resin adhesive that develop low content of free formaldehyde content, that properties are excellent has important reality meaning
Justice.
Summary of the invention
The purpose of the present invention is overcoming deficiency in the prior art, a kind of environment-friendly modified urea-formaldehyde resin adhesive is provided；
The present invention prepares modified hydrotalcite by coprecipitation using titanate esters and Dopamine as modifying agent, as additive
It is used to prepare environment-friendly modified urea-formaldehyde resin adhesive.Environment-friendly modified urea-formaldehyde resin adhesive free formaldehyde prepared by the present invention
Content is low and has excellent glue-joint strength, and shear strength reaches as high as 2.68MPa；Environment-friendly modified urea-formaldehyde resin adhesive
The glued board burst size of methanal of preparation is only 0.019mg/L, may be directly applied to interior, safety and environmental protection.
The present invention provides a kind of preparation method of environment-friendly modified urea-formaldehyde resin adhesive, by urea-formaldehyde resin adhesive with
Modified hydrotalcite mixing, stirs to obtain environment-friendly modified urea-formaldehyde resin adhesive at 20-80 DEG C；
The modified hydrotalcite using magnesium chloride and aluminum sulfate as raw material, using sodium hydroxide and sodium carbonate as alkali, with titanate esters
It is modifying agent with Dopamine, is stirred is prepared in aqueous solution.
Preferably, the weight ratio of the modified hydrotalcite and urea-formaldehyde resin adhesive is 0-20:100, further preferably
0.5-10.0:100；It is still more preferably 3-8:100；
Preferably, the specific preparation method of the modified hydrotalcite includes the following steps:
1) by 25g magnesium chloride and 13g aluminum sulfate it is soluble in water magnalium mixed solution；2.0g titanate esters are dissolved in methanol
Obtain titanate coupling agent solution；Then metatitanic acid ester solution is added drop-wise in magnalium mixed solution and stirs evenly to obtain the first mixed liquor；
2) 13g sodium hydroxide and 2.5g sodium carbonate formation alkaline solution soluble in water is spare；
3) methanol solution for 10-20mmol Dopamine being dissolved in formation Dopamine in methanol is spare；Catechol
The mole dosage of ethamine is more preferably 15-16mmol；
4) the first mixed liquor is warming up to 40-70 DEG C, then respectively simultaneously by the methanol of alkaline solution and Dopamine
Solution is added drop-wise in the first mixed liquor, insulation reaction 1-2h after completion of dropwise addition；Then aqueous hydrochloric acid solution regulation system pH is added dropwise extremely
5-6 is warming up to filtering, washing after back flow reaction 6-8h, is dried under reduced pressure, is crushed to partial size as 2 microns or less and obtains modified hydrotalcite.
Preferably, the titanate esters are isopropyl three (dioctylphyrophosphoric acid acyloxy) titanate esters (TMC-201), isopropyl
Three (dioctyl phosphoric acid acyloxy) titanate esters (TMC-102) or two oleic acid acyloxy of isopropyl (dioctyl phosphoric acid acyloxy) metatitanic acid
Ester (TMC-101)；
Preferably, the preparation method of the urea-formaldehyde resin adhesive includes the following steps:
A) formalin is added in reactor, is warming up to 40-50 DEG C, using sodium hydroxide regulation system pH=9-10；
B) urea is added in three batches, the 40-45% of urea total amount is added in first；80-90 DEG C is warming up to after stirring and dissolving
React 1-2h；Then second batch urea reaction 0.5-1h, second batch urea is added after 5%V formic acid regulation system pH=4-5 is added
Additional amount accounts for the 45-50% of total amount；Using ammonia water conditioning system pH=7.5-8.0, remaining urea reaction 0.5-1h is then added,
It is cooled to 40-45 DEG C of ammonia water conditioning system pH=8.0, room temperature is cooled to and obtains urea-formaldehyde resin adhesive.
Preferably, the molar ratio of the formaldehyde and urea is 1.1-1.6:1；In general, n (formaldehyde): n (urea) ratio is got over
Small, free formaldehyde content is fewer, but the glue-joint strength of UF adhesive is substantially reduced.
Hydrotalcite is a kind of layered double-hydroxide, and surface has great amount of hydroxy group, Yi Jiju, is divided in Lauxite
It is poor to dissipate property；The present invention adds titanate coupling agent using coprecipitation method in the preparation process of hydrotalcite and is modified to it, even
The Dopamine that is incorporated as of connection agent provides a large amount of binding sites on the surface of hydrotalcite and the polymerization of interlayer.It is modified not only
The defect that hydrotalcite itself is easy the bad dispersibility in organic substance is overcome, and hydrotalcite can be made as methanal trapping agent
(its distinctive layer structure, and great amount of hydroxy group is contained on surface, can form hydrogen bond with formaldehyde gas), makes formaldehyde in hydrotalcite table
Face and interlayer can in Dopamine amino and phenolic hydroxyl group polymerize, to play the effect of removal formaldehyde.
Environment-friendly modified urea-formaldehyde resin adhesive prepared by the present invention can be used for preparing glued board, the method is as follows:
1) match glue: according to the environment-friendly modified urea-formaldehyde resin adhesive of weight ratio: ammonium chloride=100: 1, the two is mixed equal
It is even；
2) Sakhu veneer: breadth is 100mm × 25mm × 1mm, and moisture content is 8%~12%, and two-sided resin added is 360g/
m2；
3) hot-press solidifying technique: hot pressing temperature is 110 DEG C, and hot pressing pressure is (1.0 ± 0.1) MPa, and hot pressing time is
1min/mm。
The present invention prepares modified hydrotalcite by coprecipitation using titanate esters and Dopamine as modifying agent, is made
It is used to prepare environment-friendly modified urea-formaldehyde resin adhesive for additive, compared with prior art, the present invention has the advantage that
1) the present invention provides a kind of environment-friendly modified urea-formaldehyde resin adhesives of low content of free formaldehyde；
2) there is excellent glue-joint strength, shearing using the environment-friendly modified urea-formaldehyde resin adhesive of modified hydrotalcite preparation
Intensity reaches as high as 2.68MPa；
3) the glued board burst size of methanal of environment-friendly modified urea-formaldehyde resin adhesive preparation prepared by the present invention is
0.019mg/L may be directly applied to interior, safety and environmental protection.
Specific embodiment
In order to make the objectives, technical solutions and advantages of the present invention clearer, With reference to embodiment, to this
Invention is further described.It should be understood that these descriptions are merely illustrative, and it is not intended to limit the scope of the invention.
Adhesive basic performance (viscosity, solid content, curing time) test: it is carried out according to GB/T14074-2006 standard
Measurement；
Adhesive glue-joint strength (being indicated with shear strength) test: glued according to II class in GB/T 17657-2013 standard
Plate is measured, and microcomputer controlled electronic universal tester is used to be measured (rate of extension 50mm/min；Test specimen is through 63 DEG C of water
After impregnating 3h, 25 DEG C of measurements).
The test of adhesive free formaldehyde: it is surveyed according to the method under 3.16.2 in GB/T 14074-2006 standard
Amount.
The test of glued board burst size of methanal: it according to GB/T 17657-2013 standard, is surveyed using ultraviolet specrophotometer
It is fixed.
Embodiment 1
Modified hydrotalcite is prepared as follows:
1) 25g magnesium chloride and 13g aluminum sulfate are dissolved in 200ml water and stir evenly to obtain magnalium mixed solution；2.0g is different
(dioctylphyrophosphoric acid acyloxy) titanate esters of propyl three (TMC-201), which are dissolved in 20ml methanol, obtains titanate coupling agent solution；So
Metatitanic acid ester solution is added drop-wise in magnalium mixed solution afterwards, uniform the first mixed liquor is stirred at room temperature；
2) by 13g sodium hydroxide and 2.5g sodium carbonate be dissolved in 100ml water formed alkaline solution it is spare；
3) methanol solution for 15-16mmol Dopamine being dissolved in formation Dopamine in 50ml methanol is spare；
4) the first mixed liquor is warming up to 45 ± 5 DEG C, then respectively simultaneously by the methanol of alkaline solution and Dopamine
Solution is added drop-wise in the first mixed liquor, insulation reaction 1-2h after completion of dropwise addition；Then aqueous hydrochloric acid solution regulation system pH is added dropwise extremely
5-6 is warming up to filtering, washing after back flow reaction 6-8h, is dried under reduced pressure at 50 DEG C to constant weight, being crushed to partial size is 2 microns or less
It obtains modified hydrotalcite (being abbreviated as LDH).
Embodiment 1-A
Compared with Example 1, titanate coupling agent is not added in preparation process, is substituted, is prepared using 2.0g methanol
Modified hydrotalcite is defined as LDH-A.
Embodiment 1-B
Compared with Example 1, do not add Dopamine in preparation process, using etc. weight percent methanols substitute, prepare
Modified hydrotalcite is defined as LDH-B.
Embodiment 2
It is used to prepare environment-friendly type as additive using LDH, LDH-A, LDH-B prepared by above-described embodiment 1,1-A, 1-B
Modified urea-formaldehyde resin glue sticks agent, prepares urea-formaldehyde resin adhesive first, the method is as follows:
A) aqueous solution of 37wt% formaldehyde is added in reactor, is warming up to 40-50 DEG C, it is water-soluble using 10wt% sodium hydroxide
Liquid regulation system pH=9-10；
B) urea (molar ratio of formaldehyde and urea total amount is 1.4:1.0) is added in three batches, urea total amount is added in first
40-45%；80-90 DEG C of reaction 1-2h is warming up to after stirring and dissolving；Then add after 5V% formic acid regulation system pH=4-5 is added
Enter second batch urea reaction 0.5-1h, second batch urea additional amount accounts for the 45-50% of total amount；Using ammonia water conditioning system pH=
Then 7.5-8.0 is added remaining urea reaction 0.5-1h, is cooled to 40-45 DEG C of ammonia water conditioning system pH=8.0, is cooled to room
It is warm to obtain urea-formaldehyde resin adhesive.
Using LDH, LDH-A or LDH-B as additive and urea-formaldehyde resin adhesive at 30-40 DEG C, R=1000rpm
Revolving speed under stirring 30min be uniformly mixed to obtain modified urea-formaldehyde resin glue stick agent；The wherein weight of additive and urea-formaldehyde resin adhesive
Amount is than being 10:100.Performance detection is carried out to the urea-formaldehyde resin adhesive that different modifying agent are prepared, the results are shown in Table 1；
The performance for the urea-formaldehyde resin adhesive that the different modifying agent of table 1 are prepared
Note: ND, which refers to, is not added any additive；Additive is in ureaformaldehyde after the uniformity refers to room temperature sealing placement 120 days
Whether there is accumulation phenomena in Resin adhesive, to reflect the compatibility of additive and Lauxite, wherein "-", which represents, divides
It dissipates uniformly, does not occur accumulation phenomena, it is good with the compatibility of Lauxite to represent it；"+", which then represents, there is accumulation phenomena, with urea
The poor compatibility of urea formaldehyde.
Test result shows the urea-formaldehyde resin adhesive free formaldehyde prepared in any additive of no addition, is glued
Intensity is respectively 0.3658% and 0.56MPa, and especially glue-joint strength performance is poor, is the formaldehyde due to being added in preparation process
Mole is much larger than urea mole；In general, n (formaldehyde): n (urea) ratio is smaller, and free formaldehyde content is fewer, but UF glue
The glue-joint strength of stick is substantially reduced.It is significantly improved using LDH, LDH-A or LDH-B as glue-joint strength after additive, especially
It is the urea-formaldehyde resin adhesive free formaldehyde prepared as additive using LDH is only 0.0019%；Dissociate in LDH-A system
Formaldehyde is 0.2952%, free formaldehyde is 0.1337% in LDH-B system, shows that titanate coupling agent and youngster must be added simultaneously
Tea Alcopar, it may be possible to since the addition of acid esters coupling agent promotes compatibility of the modified hydrotalcite in Lauxite, thus
It preferably interacts with Lauxite matrix, achievees the purpose that absorption and removal free formaldehyde, the two has significant collaboration
Effect.
Embodiment 3
Invention further contemplates the modified hydrotalcites (being abbreviated as LDH) of the preparation of embodiment 1 in Lauxite gluing
Influence (weight ratio LDH: urea-formaldehyde resin adhesive (be abbreviated as UF)=1-20:100) of the agent additional amount to adhesive property, wherein
Urea-formaldehyde resin adhesive preparation method is such as embodiment 2；The modified urea-formaldehyde tree that the additional amount of different modified hydrotalcite LDH is prepared
The property of rouge adhesive is as shown in table 2:
2 modified hydrotalcite additional amount of table sticks the influence of agent to modified urea-formaldehyde resin glue
Test result shows gradually to decline with the increase free formaldehyde content of modified hydrotalcite LDH dosage, shears simultaneously
Intensity is stepped up；It is due to introducing modified hydrotalcite LDH in Lauxite, by the formaldehyde adsorption performance and catechu of hydrotalcite
Alcopar and/or its polymer greatly enhance the absorption and removal of free formaldehyde, therefore free formaldehyde content reduces；Another party
Face, modified hydrotalcite LDH itself containing great amount of hydroxy group, plus a large amount of amino contained in Dopamine monomer and polymer,
Phenolic hydroxyl group is equal to methylolurea, amino in Lauxite etc. and generates hydrogen bond action, to make the shear strength of adhesive significantly
Enhancing；But modified hydrotalcite LDH additional amount is more than to keep system viscosity excessive after 10%, and cracking is easy after adhesive solidification, therefore
Shear strength is gradually reduced again；Comprehensively consider, modified hydrotalcite LDH: urea-formaldehyde resin adhesive (being abbreviated as UF)=8:100.
Embodiment 4
With modified hydrotalcite LDH: the environment-friendly modified ureaformaldehyde that urea-formaldehyde resin adhesive (being abbreviated as UF)=8:100 is prepared
Resin adhesive is used to prepare glued board, the method is as follows:
1) match glue: according to the environment-friendly modified urea-formaldehyde resin adhesive of weight ratio: ammonium chloride=100: 1, the two is mixed equal
It is even；
2) Sakhu veneer: breadth is 100mm × 25mm × 1mm, and moisture content is 8%~12%, and two-sided resin added is 360g/
m2；
3) hot-press solidifying technique: hot pressing temperature is 110 DEG C, and hot pressing pressure is (1.0 ± 0.1) MPa, and hot pressing time is
1min/mm。
Using ultraviolet specrophotometer, system is measured according to the method under 4.60 in GB/T 17657-2013 standard
The burst size of methanal of standby glued board out, result 0.019mg/L, the glued board for showing that the present invention prepares may be directly applied to
Interior, safety and environmental protection.
Although embodiments of the present invention are described in detail, it should be understood that, without departing from of the invention
In the case where spirit and scope, embodiments of the present invention can be made with various changes, replacement and change.
Claims (9)
1. a kind of preparation method of environment-friendly modified urea-formaldehyde resin adhesive, it is characterised in that: by urea-formaldehyde resin adhesive with change
Property hydrotalcite mixing, environment-friendly modified urea-formaldehyde resin adhesive is stirred to obtain at 20-80 DEG C；
The modified hydrotalcite using magnesium chloride and aluminum sulfate as raw material, using sodium hydroxide and sodium carbonate as alkali, with titanate esters and youngster
Tea Alcopar is modifying agent, is stirred is prepared in aqueous solution.
2. preparation method according to claim 1, it is characterised in that: the modified hydrotalcite and urea-formaldehyde resin adhesive
Weight ratio is 0.5-10.0:100.
3. preparation method according to claim 2, it is characterised in that: the modified hydrotalcite and urea-formaldehyde resin adhesive
Weight ratio is 3-8:100.
4. preparation method according to claim 1-3, it is characterised in that: the preparation method of the modified hydrotalcite
Include the following steps:
1) by 25g magnesium chloride and 13g aluminum sulfate it is soluble in water magnalium mixed solution；2.0g titanate esters are dissolved in methanol and obtain titanium
Acid esters coupling agent solution；Then metatitanic acid ester solution is added drop-wise in magnalium mixed solution and stirs evenly to obtain the first mixed liquor；
2) 13g sodium hydroxide and 2.5g sodium carbonate formation alkaline solution soluble in water is spare；
3) methanol solution for 10-20mmol Dopamine being dissolved in formation Dopamine in methanol is spare；
4) the first mixed liquor is warming up to 40-70 DEG C, then respectively simultaneously by the methanol solution of alkaline solution and Dopamine
It is added drop-wise in the first mixed liquor, insulation reaction 1-2h after completion of dropwise addition；Then aqueous hydrochloric acid solution regulation system pH to 5-6 is added dropwise,
It is warming up to filtering after back flow reaction 6-8h, washing, is dried under reduced pressure, crushes to obtain modified hydrotalcite.
5. preparation method according to claim 1-3, it is characterised in that: the titanate esters are isopropyl three (two
Octyl pyrophosphoric acid acyloxy) titanate esters, (the dioctyl phosphoric acid acyloxy) titanate esters of isopropyl three or two oleic acid acyloxy of isopropyl
(dioctyl phosphoric acid acyloxy) titanate esters.
6. preparation method according to claim 1, it is characterised in that: the preparation method of the urea-formaldehyde resin adhesive includes
Following steps:
A) formalin is added in reactor, is warming up to 40-50 DEG C, using sodium hydroxide regulation system pH=9-10；
B) urea is added in three batches, the 40-45% of urea total amount is added in first；80-90 DEG C of reaction 1- is warming up to after stirring and dissolving
2h；Then second batch urea reaction 0.5-1h is added after 5%V formic acid regulation system pH=4-5 is added, second batch urea additional amount accounts for
The 45-50% of total amount；Using ammonia water conditioning system pH=7.5-8.0, remaining urea reaction 0.5-1h is then added, is cooled to 40-
45 DEG C of ammonia water conditioning system pH=8.0, are cooled to room temperature and obtain urea-formaldehyde resin adhesive.
7. preparation method according to claim 6, it is characterised in that: the molar ratio of the formaldehyde and urea is 1.1-1.6:
1。
8. a kind of purposes of the environment-friendly modified urea-formaldehyde resin adhesive of any one of claim 1-7 preparation method preparation,
It is characterized by: being used to prepare glued board.
9. purposes according to claim 8, it is characterised in that: specifically comprise the following steps:
1) match glue: according to the environment-friendly modified urea-formaldehyde resin adhesive of weight ratio: ammonium chloride=100: 1, the two is uniformly mixed i.e.
It can；
2) Sakhu veneer: breadth is the mm × 1 of 100 mm × 25 mm, and moisture content is 8% ~ 12%, and two-sided resin added is 360
g/m2；
3) hot-press solidifying technique: hot pressing temperature is 110 DEG C, and hot pressing pressure is (1.0 ± 0.1) MPa, and hot pressing time is 1 min/
mm。
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| CN111303809A (en) * | 2020-04-07 | 2020-06-19 | 香河众旺木业有限公司 | Medium-density fiberboard urea-formaldehyde glue and preparation method thereof |
| CN112592685A (en) * | 2020-12-21 | 2021-04-02 | 苏州中材非金属矿工业设计研究院有限公司 | Environment-friendly modified urea-formaldehyde resin adhesive and preparation method thereof |
| CN114057968A (en) * | 2021-11-18 | 2022-02-18 | 嘉兴学院 | Preparation and application of environment-friendly urea-formaldehyde resin |
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| CN111303809A (en) * | 2020-04-07 | 2020-06-19 | 香河众旺木业有限公司 | Medium-density fiberboard urea-formaldehyde glue and preparation method thereof |
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| CN114057968B (en) * | 2021-11-18 | 2023-07-28 | 嘉兴学院 | Preparation and application of environment-friendly urea-formaldehyde resin |
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