CN108165218A - A kind of special adhesive of compact-panel and preparation method thereof - Google Patents
A kind of special adhesive of compact-panel and preparation method thereof Download PDFInfo
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- CN108165218A CN108165218A CN201711376183.7A CN201711376183A CN108165218A CN 108165218 A CN108165218 A CN 108165218A CN 201711376183 A CN201711376183 A CN 201711376183A CN 108165218 A CN108165218 A CN 108165218A
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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
- C09J161/30—Condensation polymers of aldehydes or ketones with only compounds containing hydrogen attached to nitrogen of aldehydes with heterocyclic and acyclic or carbocyclic compounds
-
- 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
-
- 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
-
- 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
- C09J11/08—Macromolecular additives
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/24—Acids; Salts thereof
- C08K3/26—Carbonates; Bicarbonates
- C08K2003/265—Calcium, strontium or barium carbonate
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K2201/00—Specific properties of additives
- C08K2201/011—Nanostructured additives
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
- C08L2205/035—Polymer mixtures characterised by other features containing three or more polymers in a blend containing four or more polymers in a blend
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- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Inorganic Chemistry (AREA)
- Adhesives Or Adhesive Processes (AREA)
Abstract
The invention discloses a kind of special adhesives of compact-panel, and component is formaldehyde, urea, melamine, accelerating agent, antifoaming agent, dispersant, modifying agent, nano-calcium carbonate calcium powder, black pigment, water.Preparation method is：(1) each component, heating melting are weighed；(2) bonus point powder, nano-calcium carbonate calcium powder and black pigment；(3) add formaldehyde, then add melamine and first urea；(4) add second batch urea, reaction；(5) plus accelerating agent, antifoaming agent and third criticize urea, reaction；(6) plus step (1) obtained material and step (2) obtained material heat preservation to get.Gained adhesive of the invention produces for existing high density fiberboard, especially act on compact-panel production, the result shows that, the internal bond strength and surface bonding strength of the special adhesive of compact-panel provided by the invention have exceeded the detection range of instrument, with extremely strong adhesive force, the more common urea-formaldehyde resin adhesive of adhesive usage amount reduces 8 15%.
Description
Technical field
The present invention relates to a kind of adhesive and preparation method thereof, the special adhesive of more particularly to a kind of compact-panel and its system
Preparation Method.
Background technology
Fiberboard is common one kind plank in our production and living, it is timber through flaking, boiling, defibrator process into wood-fibred
It recombinates hot pressing again afterwards to form, has many advantages, such as that plate face is bright and clean, processing performance is excellent, widely used, but water resistance is poor, thus
The bigger occasion of some ambient humidities, such as kitchen tools table top, washing table top and bath lavatory compartment can not also be used directly.At present
The plank made and formed is laminated the most commonly used is a kind of resin impregnating layers of kraft paper, market is commonly called as compact grade laminate plate or compact-panel.
This kind of panel density is high, and mechanical strength is big, and water resistance is excellent, but needs impregnating resin, and resin demand is big, low production efficiency,
Production cost is very high.Therefore, production performance excellent fiberboard replaces the application of above-mentioned plank to have important practical significance.
Fibreboard Production high degree of automation, takes advantage in production efficiency, it is important to improve the water-fast of fiberboard
Property.Currently used method is to increase adhesive dosage, improves panel density, but can also production cost be made significantly to carry in this way
Height loses price advantage.In order to reduce the dosage of adhesive, many enterprises can select to add some fillers, commonly use para arrowroot
Powder, soy meal etc., but additive amount can increase the water imbibition of plank, while also the mechanical strength of plank can be made substantially to drop later greatly
It is low.
The information for being disclosed in the background technology part is merely intended to increase the understanding of the general background to the present invention, without answering
When being considered as recognizing or imply that information composition has been the prior art well known to persons skilled in the art in any form.
Invention content
The present invention invents special adhesive of a kind of compact-panel and preparation method thereof for above-mentioned technical problem, it is intended to
It is high, water-tolerant so as to obtain a kind of intensity using the adhesive to the adhesive that a kind of production cost is low, adhesion strength is big
Fiberboard.
To achieve the above object, technical solution provided by the invention is as follows：
A kind of special adhesive of compact-panel, includes following components：Formaldehyde, urea, melamine, accelerating agent, antifoaming agent,
Dispersant, modifying agent, nano-calcium carbonate calcium powder, black pigment, water.
Preferably, the special adhesive of the compact-panel includes following components according to ratio of weight and number：Formaldehyde 100
Part, 75~80 parts of urea, 5-10 parts of melamine, 5-10 parts of accelerating agent, 1-2 parts of antifoaming agent, 2-5 parts of dispersant, modifying agent 5-
10 parts, 30-50 parts of nano-calcium carbonate calcium powder, 5-10 parts of black pigment, 100-200 parts of water.
Preferably, the accelerating agent is polyacrylamide；The dispersant is polyvinyl alcohol or lignin sulfonic acid
Sodium.
Preferably, the antifoaming agent is silicone emulsion, dimethyl silicone polymer, polyoxypropylene ethylene oxide glycerin ether
In any one.
A kind of preparation method of the special adhesive of compact-panel as described above, includes the following steps：
(1) following components is weighed：Formaldehyde, urea, melamine, accelerating agent, antifoaming agent, dispersant, modifying agent, nano-sized carbon
Then sour calcium powder, black pigment, water add in modifying agent in storage tank a, being warming up to 70-80 DEG C makes its melting；
(2) step (1) is weighed gained dispersant, nano-calcium carbonate calcium powder and black pigment to add in storage tank b, mixing is equal
It is even；
(3) step (1) is weighed into gained formaldehyde and adds in reaction kettle, adjusted pH value 8-9 in reaction kettle, be warming up to 40-50 DEG C,
Then it adds in step (1) and weighs gained melamine and first urea, react 30-40min；
(4) pH value 4-6 in reaction kettle is adjusted, in 85-93 DEG C of polycondensation reaction 110-130min, then adds second batch urine
Element reacts 30-40min under the conditions of 70-80 DEG C；
(5) it adjusts pH value in reaction kettle and, to 7-8, accelerating agent, antifoaming agent and third batch urea is added in, in 70-80 DEG C of condition
Lower reaction 30-40min；
(6) it adjusts pH value in reaction kettle and, to 7-8, adds in step (1) storage tank a obtained material and step (2) storage after melting
Obtained material after being mixed in tank b, 30min is kept the temperature under the conditions of 50-60 DEG C, is then cooled to 40 DEG C hereinafter, to obtain the final product.
Preferably, the amount of first urea added in step (3) accounts for step (1) and weighs gained urea total amount
50%.
Preferably, the amount of the second batch urea added in step (4) accounts for step (1) and weighs gained urea total amount
35%.
Preferably, the amount of third batch urea added in step (5) accounts for step (1) and weighs gained urea total amount
15%.
Preferably, used in step (3) step (5) and step (6) mass concentration for 30% sodium hydroxide solution tune
Save pH value in reaction kettle.
Preferably, use in step (4) mass concentration for 20~30% first acid for adjusting pH value.
Compared with prior art, the present invention has the advantages that：
Gained adhesive of the invention produces for existing high density fiberboard, especially acts on compact-panel production, system
Performance detection is carried out after obtaining plank, the results showed that, the internal bond strength and table of the special adhesive of compact-panel provided by the invention
Face bond strength has exceeded the detection range of instrument, has extremely strong adhesive force, the more common ureaformaldehyde tree of adhesive usage amount
Fat adhesive reduces 8-15%.
Specific embodiment
It is described in detail With reference to embodiment, it is to be understood that protection scope of the present invention is not by specific
The limitation of embodiment.The instrument that pH value is detected in embodiment is thunder magnetic acidometer PHS-3C, the modifying agent used in embodiment
The A-924 type modifying agent provided for Guangzhou Leker import and export corporations.
Embodiment 1
A kind of preparation method of the special adhesive of compact-panel, operating procedure are as follows：
(1) following components is weighed as unit of ton：5 tons of formaldehyde, 3.75 tons of urea, 0.25 ton of melamine, accelerating agent gather
0.25 ton of acrylamide, 0.05 ton of antifoaming agent silicone emulsion, 0.1 ton of polyethylene of dispersing agent alcohol, 0.25 ton of modifying agent, nano-calcium carbonate
Then 1.5 tons of calcium powder, 0.25 ton of black pigment, 6 tons of tap water add in modifying agent in storage tank a, being warming up to 75 DEG C makes it molten
Melt；
(2) step (1) is weighed gained dispersant, nano-calcium carbonate calcium powder and black pigment to add in storage tank b, mixing is equal
It is even；
(3) by step (1) weigh gained formaldehyde add in reaction kettle, use mass concentration for 30% sodium hydroxide solution tune
PH value 8 in reaction kettle is saved, is warming up to 40 DEG C, then addition step (1) weighs gained melamine and first urea (accounts for step
(1) the 50% of gained urea total amount is weighed), react 30min；
(4) mass concentration is used to adjust pH value 4 in reaction kettle for 25% formic acid, in 85 DEG C of polycondensation reaction 110min, so
Second batch urea (accounting for step (1) weighs gained urea total amount 35%) is added afterwards, reacts 30min under the conditions of 70 DEG C；
(5) mass concentration is used to adjust pH value in reaction kettle for 30% sodium hydroxide solution, to 8, to add in accelerating agent, disappear
Infusion and third batch urea (accounting for step (1) weighs gained urea total amount 15%), react 30min under the conditions of 70 DEG C；
(6) mass concentration is used to adjust pH value in reaction kettle for 30% sodium hydroxide solution, to 8, to add in step (1) and store up
Obtained material after being mixed in obtained material and step (2) storage tank b after being melted in tank a is uniformly mixed, is kept the temperature under the conditions of 50 DEG C
30min, be then cooled to 40 DEG C hereinafter, discharging to get.
Embodiment 2
A kind of preparation method of the special adhesive of compact-panel, operating procedure are as follows：
(1) following components is weighed as unit of ton：5 tons of formaldehyde, 4 tons of urea, 0.5 ton of melamine, accelerating agent polypropylene
0.5 ton of amide, 0.1 ton of antifoaming agent dimethyl silicone polymer, 0.25 ton of dispersant sodium lignin sulfonate, modifying agent 0.5 ton, nanometer
Then modifying agent is added in storage tank a, is warming up to 80 DEG C by 2.5 tons of calcium carbonate powder, 0.5 ton of black pigment, 100 tons of tap water
Make its melting；
(2) step (1) is weighed gained dispersant, nano-calcium carbonate calcium powder and black pigment to add in storage tank b, mixing is equal
It is even；
(3) by step (1) weigh gained formaldehyde add in reaction kettle, use mass concentration for 30% sodium hydroxide solution tune
PH value 9 in reaction kettle is saved, is warming up to 50 DEG C, then addition step (1) weighs gained melamine and first urea (accounts for step
(1) the 50% of gained urea total amount is weighed), react 40min；
(4) mass concentration is used to adjust pH value 6 in reaction kettle for 20% formic acid, in 93 DEG C of polycondensation reaction 130min, so
Second batch urea (accounting for step (1) weighs gained urea total amount 35%) is added afterwards, reacts 40min under the conditions of 80 DEG C；
(5) mass concentration is used to adjust pH value in reaction kettle for 30% sodium hydroxide solution, to 8, to add in accelerating agent, disappear
Infusion and third batch urea (accounting for step (1) weighs gained urea total amount 15%), react 30min under the conditions of 80 DEG C；
(6) mass concentration is used to adjust pH value in reaction kettle for 30% sodium hydroxide solution, to 8, to add in step (1) and store up
Obtained material after being mixed in obtained material and step (2) storage tank b after being melted in tank a is uniformly mixed, is kept the temperature under the conditions of 60 DEG C
30min, be then cooled to 40 DEG C hereinafter, discharging to get.
Embodiment 3
A kind of preparation method of the special adhesive of compact-panel, operating procedure are as follows：
(1) following components is weighed as unit of ton：5 tons of formaldehyde, 3.85 tons of urea, 0.35 ton of melamine, accelerating agent gather
0.35 ton of acrylamide, 0.05 ton of antifoaming agent polyoxypropylene ethylene oxide glycerin ether, 0.15 ton of polyethylene of dispersing agent alcohol, modifying agent
0.35 ton, 2 tons of nano-calcium carbonate calcium powder, 0.4 ton of black pigment, 7.5 tons of tap water, then modifying agent is added in storage tank a, is risen
Temperature makes its melting to 75 DEG C；
(2) step (1) is weighed gained dispersant, nano-calcium carbonate calcium powder and black pigment to add in storage tank b, mixing is equal
It is even；
(3) by step (1) weigh gained formaldehyde add in reaction kettle, use mass concentration for 30% sodium hydroxide solution tune
PH value 8 in reaction kettle is saved, is warming up to 45 DEG C, then addition step (1) weighs gained melamine and first urea (accounts for step
(1) the 50% of gained urea total amount is weighed), react 35min；
(4) mass concentration is used to adjust pH value 5 in reaction kettle for 30% formic acid, in 89 DEG C of polycondensation reaction 120min, so
Second batch urea (accounting for step (1) weighs gained urea total amount 35%) is added afterwards, reacts 35min under the conditions of 75 DEG C；
(5) mass concentration is used to adjust pH value in reaction kettle for 30% sodium hydroxide solution, to 8, to add in accelerating agent, disappear
Infusion and third batch urea (accounting for step (1) weighs gained urea total amount 15%), react 35min under the conditions of 75 DEG C；
(6) mass concentration is used to adjust pH value in reaction kettle for 30% sodium hydroxide solution, to 8, to add in step (1) and store up
Obtained material after being mixed in obtained material and step (2) storage tank b after being melted in tank a is uniformly mixed, is kept the temperature under the conditions of 55 DEG C
30min, be then cooled to 40 DEG C hereinafter, discharging to get.
It prepares gained adhesive properties to embodiment 1 to be detected, testing result is as shown in table 1：
Table 1
Gained compact-panel quantitative measurement is prepared using adhesive of the present invention in embodiment 1：Interior combination is more than
2.0MPa, static bending strength are more than 50.0MPa, and thickness swelling rate is less than 5.0%, and Extraction method is surveyed burst size of methanal and is less than
7.0mg/100g (Extraction method) meets national GB18580-2001 standards), adhesive can save 8-15%.
The description of the aforementioned specific exemplary embodiment to the present invention is in order to illustrate and illustration purpose.These descriptions
It is not wishing to limit the invention to disclosed precise forms, and it will be apparent that according to the above instruction, can much be changed
And variation.The purpose of selecting and describing the exemplary embodiment is that explain that the specific principle of the present invention and its reality should
With so that those skilled in the art can realize and utilize the present invention a variety of different exemplary implementations and
Various chooses and changes.The scope of the present invention is intended to be limited by claims and its equivalents.
Claims (10)
1. a kind of special adhesive of compact-panel, which is characterized in that include following components：Formaldehyde, urea, melamine, promotion
Agent, antifoaming agent, dispersant, modifying agent, nano-calcium carbonate calcium powder, black pigment, water.
2. the special adhesive of compact-panel according to claim 1, which is characterized in that the special gluing of the compact-panel
Agent includes following components according to ratio of weight and number：100 parts of formaldehyde, 75~80 parts of urea, 5-10 parts of melamine, accelerating agent 5-10
Part, 1-2 parts of antifoaming agent, 2-5 parts of dispersant, 5-10 parts of modifying agent, 30-50 parts of nano-calcium carbonate calcium powder, 5-10 parts of black pigment,
100-200 parts of water.
3. the special adhesive of compact-panel according to claim 1, it is characterised in that the accelerating agent is polyacrylamide
Amine；The dispersant is polyvinyl alcohol or sodium lignin sulfonate.
4. the special adhesive of compact-panel according to claim 1, it is characterised in that the antifoaming agent for silicone emulsion,
Any one in dimethyl silicone polymer, polyoxypropylene ethylene oxide glycerin ether.
5. a kind of preparation method of the special adhesive of compact-panel as described in claim 1, which is characterized in that including following step
Suddenly：
(1) following components is weighed：Formaldehyde, urea, melamine, accelerating agent, antifoaming agent, dispersant, modifying agent, nano-calcium carbonate
Then powder, black pigment, water add in modifying agent in storage tank a, being warming up to 70-80 DEG C makes its melting；
(2) step (1) is weighed gained dispersant, nano-calcium carbonate calcium powder and black pigment to add in storage tank b, is uniformly mixed；
(3) step (1) is weighed into gained formaldehyde and adds in reaction kettle, adjusted pH value 8-9 in reaction kettle, be warming up to 40-50 DEG C, then
It adds in step (1) and weighs gained melamine and first urea, react 30-40min；
(4) pH value 4-6 in reaction kettle is adjusted, in 85-93 DEG C of polycondensation reaction 110-130min, then adds second batch urea,
30-40min is reacted under the conditions of 70-80 DEG C；
(5) it adjusts pH value in reaction kettle and, to 7-8, adds in accelerating agent, antifoaming agent and third batch urea, under the conditions of 70-80 DEG C instead
Answer 30-40min；
(6) pH value in reaction kettle is adjusted, to 7-8, to add in step (1) storage tank a after melting in obtained material and step (2) storage tank b
Obtained material after mixing, keeps the temperature 30min under the conditions of 50-60 DEG C, is then cooled to 40 DEG C hereinafter, to obtain the final product.
6. preparation method according to claim 5, it is characterised in that：The amount of first urea added in step (3) accounts for
Step (1) weighs the 50% of gained urea total amount.
7. preparation method according to claim 5, it is characterised in that：The amount of the second batch urea added in step (4) accounts for
Step (1) weighs the 35% of gained urea total amount.
8. preparation method according to claim 5, it is characterised in that：The amount of third batch urea added in step (5) accounts for
Step (1) weighs the 15% of gained urea total amount.
9. preparation method according to claim 5, it is characterised in that：Matter is used in step (3) step (5) and step (6)
The sodium hydroxide solution for measuring a concentration of 30% adjusts pH value in reaction kettle.
10. preparation method according to claim 5, it is characterised in that：Mass concentration is used as 20~30% in step (4)
First acid for adjusting pH value.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711376183.7A CN108165218B (en) | 2017-12-19 | 2017-12-19 | Special adhesive for anti-doublet plate and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711376183.7A CN108165218B (en) | 2017-12-19 | 2017-12-19 | Special adhesive for anti-doublet plate and preparation method thereof |
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| Publication Number | Publication Date |
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| CN108165218A true CN108165218A (en) | 2018-06-15 |
| CN108165218B CN108165218B (en) | 2021-01-01 |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102061141A (en) * | 2009-11-11 | 2011-05-18 | 青岛生物能源与过程研究所 | Method for preparing environmentally-friendly adhesive for lignin-based timber |
| CN102086295A (en) * | 2010-06-28 | 2011-06-08 | 永港伟方（北京）科技股份有限公司 | Urea-formaldehyde resin for non-dewatering particleboard and preparation method thereof |
| CN104194696A (en) * | 2014-08-21 | 2014-12-10 | 北京林业大学 | Boiling-water-resistant modified urea formaldehyde resin adhesive and preparation method thereof |
| US20170342229A1 (en) * | 2015-05-07 | 2017-11-30 | Rui Ye | Method for preparing high-performance melamine foam |
-
2017
- 2017-12-19 CN CN201711376183.7A patent/CN108165218B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102061141A (en) * | 2009-11-11 | 2011-05-18 | 青岛生物能源与过程研究所 | Method for preparing environmentally-friendly adhesive for lignin-based timber |
| CN102086295A (en) * | 2010-06-28 | 2011-06-08 | 永港伟方（北京）科技股份有限公司 | Urea-formaldehyde resin for non-dewatering particleboard and preparation method thereof |
| CN104194696A (en) * | 2014-08-21 | 2014-12-10 | 北京林业大学 | Boiling-water-resistant modified urea formaldehyde resin adhesive and preparation method thereof |
| US20170342229A1 (en) * | 2015-05-07 | 2017-11-30 | Rui Ye | Method for preparing high-performance melamine foam |
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