CN114311177A - Preparation method of low-carbon formaldehyde-free ecological plate - Google Patents
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Abstract
The invention relates to the technical field of ecological plates and discloses a preparation method of a low-carbon aldehyde-free ecological plate, wherein a single-layer plate is coated according to the coating amount of 1.25-2.5g/m3Coating nano core-shell high-efficiency wave absorbing agent slurry, adding a urea-formaldehyde adhesive, laminating a plurality of single-layer plates to form a plate blank, and pressing the plate blank into a plywood by using a microwave heating machine; the ecological plate prepared by the preparation method of the low-carbon formaldehyde-free ecological plate has excellent mechanical property and formaldehyde releaseLow amount and environmental protection; the urea-formaldehyde resin adhesive prepared by the specific method is used as the adhesive, and has the characteristics of short drying time and high bonding strength.
Description
Technical Field
The invention relates to the technical field of ecological plates, in particular to a preparation method of a low-carbon aldehyde-free ecological plate.
Background
Today, with the rapid development of economy, the quality of life of people is greatly improved, and the requirements of people on the indoor air quality are stricter. The rise and popularization of indoor decoration causes a series of air pollution problems, so that the indoor air quality is more and more concerned by people. The urea-formaldehyde resin adhesive used for interior decoration materials such as wooden furniture, artificial boards and the like contains a large amount of formaldehyde, and the formaldehyde is slowly released in an indoor environment, so that the formaldehyde becomes a main pollutant of indoor air. Aiming at the characteristics of low concentration, long release period and the like of formaldehyde, people do a great deal of research work on how to remove indoor formaldehyde.
In order to solve the problem of overproof indoor formaldehyde concentration, researchers propose various solutions for controlling and eliminating formaldehyde, such as a physical adsorption method and a chemical degradation method. Compared with physical adsorption, chemical degradation can thoroughly eliminate formaldehyde, and is an effective formaldehyde pollution control means at present. In addition, attempts have been made to add a wave absorber to the widely used urea resin adhesive to improve curing efficiency, reduce heating time, and reduce formaldehyde emissions. In the actual production of artificial composite boards, the urea-formaldehyde adhesive is widely applied due to excellent performance and low cost. Although the prior invention provides a plurality of novel adhesives, the preparation process is more complex, the cost is higher, and certain limitations still exist in the practical application. Therefore, it is an urgent problem to provide a panel that can effectively prevent formaldehyde from being released into the indoor environment while adding urea formaldehyde adhesive.
Based on the above, a preparation method of a low-carbon aldehyde-free ecological plate is provided, and hopes are made to solve the defects in the prior art.
Disclosure of Invention
Technical problem to be solved
Aiming at the defects of the prior art, the invention provides a preparation method of a low-carbon aldehyde-free ecological plate.
(II) technical scheme
In order to achieve the purpose, the invention provides the following technical scheme:
a preparation method of a low-carbon formaldehyde-free ecological plate comprises the step of coating a single-layer plate according to the coating amount of 1.25-2.5g/m3Coating the nano core-shell high-efficiency wave absorbing agent slurry, adding a urea-formaldehyde adhesive, laminating a plurality of single-layer plates to form a plate blank, and pressing the plate blank into a plywood by using a microwave heating machine.
As a further technical scheme: the preparation method of the nano core-shell efficient wave absorber slurry comprises the following steps:
the core-shell nano material consists of central particles and a coating layer, wherein the core is connected with the shell through physical or chemical action;
and mixing the core-shell nano material with deionized water according to the mass ratio of 1:20 to obtain the nano material.
As a further technical solution, the central particles are silicon carbide particles.
As a further technical scheme, the coating layer is made of cyclodextrin loaded outer layer particles, and the outer layer particles are one or more of iron, cobalt and nickel.
As a further technical scheme: the mol ratio of the cyclodextrin to the silicon carbide particles to the outer layer particles is 1: 1-1.2: 0.10-0.25.
As a further technical scheme: the preparation method of the urea-formaldehyde adhesive comprises the following steps:
adding formaldehyde into a reaction kettle, adjusting the pH value to 7.1, adding a first batch of urea and cerium oxide, heating to 80 ℃, keeping the temperature for 30min, adjusting the pH value to 5.0, stirring for 40min, then adding a second batch of urea and rosin resin, adjusting the pH value to 7.0, cooling to 65 ℃, continuing stirring for 2 h, cooling to 45 ℃, and discharging.
As a further technical scheme, the molar ratio of the formaldehyde to the urea is 1.48: 1, and the adding mass ratio of the first batch of urea to the second batch of urea is 1: 2;
cerium oxide accounts for 1 percent of the mass of the urea;
the mass ratio of the rosin to the urea is 1: 5.
As a further technical scheme, the rosin resin is hydrogenated rosin resin.
As a further means, the hydrogenated rosin resin contained 75% of dihydroabietic acid, a relative density of 1.045, a softening point of 72 ℃, an acid value of 162mgKOH/g, and a saponification value of 167 mgKOH/g.
As a further technical scheme, the pressure of the pressing is 5-8MPa, the temperature is 150-180 ℃, and the time is 1-2 min.
The urea-formaldehyde adhesive prepared by the invention can show an almost amorphous structure, has higher curing speed and higher crosslinking degree, has the characteristic of higher density compared with the conventional urea-formaldehyde adhesive, and the adhesive strength is improved by 58.7 percent.
According to the invention, a small amount of cerium oxide is introduced, the viscosity of the urea-formaldehyde resin is changed without obvious agglomeration, but the glass transition point and the gel temperature of the urea-formaldehyde resin are changed, and the formaldehyde release in the curing process of the urea-formaldehyde resin at high temperature can be effectively reduced.
By introducing hydrogenated rosin containing a certain amount of pimaric acid, which reacts with formaldehyde to form 12, 14-dimethylolpimaric acid (i.e. hydroxymethyl rosin), the hydroxymethyl rosin is further bonded with urea-formaldehyde resin to form a copolymer similar to an ewron structure, which not only has higher chemical stability, but also can effectively reduce the number of hydroxymethyl end groups, and the interaction of hydroxymethyl and water is effectively inhibited due to the introduction of the hydrogenated rosin structure, so that the urea-formaldehyde resin is not easy to hydrolyze during use.
Quasi-drug
(III) advantageous effects
Compared with the prior art, the invention provides a preparation method of a low-carbon aldehyde-free ecological plate, which has the following beneficial effects:
the ecological plate prepared by the preparation method of the low-carbon formaldehyde-free ecological plate has excellent mechanical properties, and has the characteristics of low formaldehyde release amount, environmental friendliness and the like;
the urea-formaldehyde resin adhesive prepared by the specific method is used as the adhesive, and has the characteristics of short drying time and high bonding strength.
Drawings
FIG. 1 is a diagram showing the influence of different parts by weight of nano core-shell wave absorbers on electromagnetic shielding performance.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
A preparation method of a low-carbon formaldehyde-free ecological plate comprises the step of coating a single-layer plate according to the coating amount of 1.25-2.5g/m3Coating the nano core-shell high-efficiency wave absorbing agent slurry, adding a urea-formaldehyde adhesive, laminating a plurality of single-layer plates to form a plate blank, and pressing the plate blank into a plywood by using a microwave heating machine.
As a further technical scheme: the preparation method of the nano core-shell efficient wave absorber slurry comprises the following steps:
the core-shell nano material consists of central particles and a coating layer, wherein the core is connected with the shell through physical or chemical action;
and mixing the core-shell nano material with deionized water according to the mass ratio of 1:20 to obtain the nano material.
As a further technical solution, the central particles are silicon carbide particles.
As a further technical scheme, the coating layer is made of cyclodextrin loaded outer layer particles, and the outer layer particles are one or more of iron, cobalt and nickel.
As a further technical scheme: the mol ratio of the cyclodextrin to the silicon carbide particles to the outer layer particles is 1: 1-1.2: 0.10-0.25.
As a further technical scheme: the preparation method of the urea-formaldehyde adhesive comprises the following steps:
adding formaldehyde into a reaction kettle, adjusting the pH value to 7.1, adding a first batch of urea and cerium oxide, heating to 80 ℃, keeping the temperature for 30min, adjusting the pH value to 5.0, stirring for 40min, then adding a second batch of urea and rosin resin, adjusting the pH value to 7.0, cooling to 65 ℃, continuing stirring for 2 h, cooling to 45 ℃, and discharging.
As a further technical scheme, the molar ratio of the formaldehyde to the urea is 1.48: 1, and the adding mass ratio of the first batch of urea to the second batch of urea is 1: 2;
cerium oxide accounts for 1 percent of the mass of the urea;
the mass ratio of the rosin to the urea is 1: 5.
As a further technical scheme, the rosin resin is hydrogenated rosin resin.
As a further means, the hydrogenated rosin resin contained 75% of dihydroabietic acid, a relative density of 1.045, a softening point of 72 ℃, an acid value of 162mgKOH/g, and a saponification value of 167 mgKOH/g.
As a further technical scheme, the pressure of the pressing is 5-8MPa, the temperature is 150-180 ℃, and the time is 1-2 min.
The following are specific examples:
example 1
A preparation method of a low-carbon formaldehyde-free ecological plate comprises the step of coating a single-layer plate according to the coating amount of 1.25g/m3Coating the nano core-shell high-efficiency wave absorbing agent slurry, adding a urea-formaldehyde adhesive, laminating a plurality of single-layer plates to form a plate blank, and pressing the plate blank into a plywood by using a microwave heating machine.
The preparation method of the nano core-shell efficient wave absorber slurry comprises the following steps:
the core-shell nano material consists of a central particle and a coating layer, wherein the core is connected with the shell through physical or chemical action.
The central particles are silicon carbide particles;
and mixing the core-shell nano material with deionized water according to the mass ratio of 1:20 to obtain the nano material.
The coating layer is made of cyclodextrin loaded outer layer particles, and the outer layer particles are one or more of iron, cobalt and nickel.
The mol ratio of the cyclodextrin to the silicon carbide particles to the outer layer particles is 1: 1: 0.10.
the preparation method of the urea-formaldehyde adhesive comprises the following steps:
adding formaldehyde into a reaction kettle, adjusting the pH value to 7.1, adding a first batch of urea and cerium oxide, heating to 80 ℃, keeping the temperature for 30min, adjusting the pH value to 5.0, stirring for 40min, then adding a second batch of urea and rosin resin, adjusting the pH value to 7.0, cooling to 65 ℃, continuing stirring for 2 h, cooling to 45 ℃, and discharging.
The molar ratio of the formaldehyde to the urea is 1.48: 1, and the adding mass ratio of the first batch of urea to the second batch of urea is 1: 2;
cerium oxide accounts for 1 percent of the mass of the urea;
the mass ratio of the rosin to the urea is 1: 5.
The rosin resin is hydrogenated rosin resin.
The hydrogenated rosin resin contains 75% of dihydroabietic acid, and has a relative density of 1.045, a softening point of 72 ℃, an acid value of 162mgKOH/g and a saponification value of 167 mgKOH/g.
The pressing pressure is 5MPa, the temperature is 150 ℃, and the pressing time is 1 min.
Example 2
A preparation method of a low-carbon formaldehyde-free ecological plate comprises the step of coating a single-layer plate according to the coating amount of 1.3g/m3Coating the nano core-shell high-efficiency wave absorbing agent slurry, adding a urea-formaldehyde adhesive, laminating a plurality of single-layer plates to form a plate blank, and pressing the plate blank into a plywood by using a microwave heating machine.
The preparation method of the nano core-shell efficient wave absorber slurry comprises the following steps:
the core-shell nano material consists of central particles and a coating layer, wherein the core is connected with the shell through physical or chemical action;
and mixing the core-shell nano material with deionized water according to the mass ratio of 1:20 to obtain the nano material.
The central particles are silicon carbide particles.
The coating layer is made of cyclodextrin loaded outer layer particles, and the outer layer particles are one or more of iron, cobalt and nickel.
The mol ratio of the cyclodextrin to the silicon carbide particles to the outer layer particles is 1: 1.1: 0.15.
the preparation method of the urea-formaldehyde adhesive comprises the following steps:
adding formaldehyde into a reaction kettle, adjusting the pH value to 7.1, adding a first batch of urea and cerium oxide, heating to 80 ℃, keeping the temperature for 30min, adjusting the pH value to 5.0, stirring for 40min, then adding a second batch of urea and rosin resin, adjusting the pH value to 7.0, cooling to 65 ℃, continuing stirring for 2 h, cooling to 45 ℃, and discharging.
The molar ratio of the formaldehyde to the urea is 1.48: 1, and the adding mass ratio of the first batch of urea to the second batch of urea is 1: 2;
cerium oxide accounts for 1 percent of the mass of the urea;
the mass ratio of the rosin to the urea is 1: 5.
The rosin resin is hydrogenated rosin resin.
The hydrogenated rosin resin contains 75% of dihydroabietic acid, and has a relative density of 1.045, a softening point of 72 ℃, an acid value of 162mgKOH/g and a saponification value of 167 mgKOH/g.
The pressing pressure is 6MPa, the temperature is 155 ℃, and the pressing time is 1.5 min.
Example 3
A preparation method of a low-carbon formaldehyde-free ecological plate comprises the step of coating a single-layer plate according to the coating amount of 1.5g/m3Coating the nano core-shell high-efficiency wave absorbing agent slurry, adding a urea-formaldehyde adhesive, laminating a plurality of single-layer plates to form a plate blank, and pressing the plate blank into a plywood by using a microwave heating machine.
The preparation method of the nano core-shell efficient wave absorber slurry comprises the following steps:
the core-shell nano material consists of central particles and a coating layer, wherein the core is connected with the shell through physical or chemical action;
and mixing the core-shell nano material with deionized water according to the mass ratio of 1:20 to obtain the nano material.
The central particles are silicon carbide particles.
The coating layer is made of cyclodextrin loaded outer layer particles, and the outer layer particles are one or more of iron, cobalt and nickel.
The mol ratio of the cyclodextrin to the silicon carbide particles to the outer layer particles is 1: 1.5: 0.18.
the preparation method of the urea-formaldehyde adhesive comprises the following steps:
adding formaldehyde into a reaction kettle, adjusting the pH value to 7.1, adding a first batch of urea and cerium oxide, heating to 80 ℃, keeping the temperature for 30min, adjusting the pH value to 5.0, stirring for 40min, then adding a second batch of urea and rosin resin, adjusting the pH value to 7.0, cooling to 65 ℃, continuing stirring for 2 h, cooling to 45 ℃, and discharging.
The molar ratio of the formaldehyde to the urea is 1.48: 1, and the adding mass ratio of the first batch of urea to the second batch of urea is 1: 2;
cerium oxide accounts for 1 percent of the mass of the urea;
the mass ratio of the rosin to the urea is 1: 5.
The rosin resin is hydrogenated rosin resin.
The hydrogenated rosin resin contains 75% of dihydroabietic acid, and has a relative density of 1.045, a softening point of 72 ℃, an acid value of 162mgKOH/g and a saponification value of 167 mgKOH/g.
The pressing pressure is 5.5MPa, the temperature is 158 ℃, and the time is 1.5 min.
Example 4
A preparation method of a low-carbon formaldehyde-free ecological plate comprises the step of coating a single-layer plate according to the coating amount of 1.8g/m3Coating the nano core-shell high-efficiency wave absorbing agent slurry, adding a urea-formaldehyde adhesive, laminating a plurality of single-layer plates to form a plate blank, and pressing the plate blank into a plywood by using a microwave heating machine.
The preparation method of the nano core-shell efficient wave absorber slurry comprises the following steps:
the core-shell nano material consists of central particles and a coating layer, wherein the core is connected with the shell through physical or chemical action;
and mixing the core-shell nano material with deionized water according to the mass ratio of 1:20 to obtain the nano material.
The central particles are silicon carbide particles.
The coating layer is made of cyclodextrin loaded outer layer particles, and the outer layer particles are one or more of iron, cobalt and nickel.
The mol ratio of the cyclodextrin to the silicon carbide particles to the outer layer particles is 1: 1.1: 0.20.
the preparation method of the urea-formaldehyde adhesive comprises the following steps:
adding formaldehyde into a reaction kettle, adjusting the pH value to 7.1, adding a first batch of urea and cerium oxide, heating to 80 ℃, keeping the temperature for 30min, adjusting the pH value to 5.0, stirring for 40min, then adding a second batch of urea and rosin resin, adjusting the pH value to 7.0, cooling to 65 ℃, continuing stirring for 2 h, cooling to 45 ℃, and discharging.
The molar ratio of the formaldehyde to the urea is 1.48: 1, and the adding mass ratio of the first batch of urea to the second batch of urea is 1: 2;
cerium oxide accounts for 1 percent of the mass of the urea;
the mass ratio of the rosin to the urea is 1: 5.
The rosin resin is hydrogenated rosin resin.
The hydrogenated rosin resin contains 75% of dihydroabietic acid, and has a relative density of 1.045, a softening point of 72 ℃, an acid value of 162mgKOH/g and a saponification value of 167 mgKOH/g.
The pressing pressure is 6MPa, the temperature is 160 ℃, and the time is 1.5 min.
Example 5
A preparation method of a low-carbon formaldehyde-free ecological plate comprises the step of coating a single-layer plate according to the coating amount of 2.0g/m3Coating the nano core-shell high-efficiency wave absorbing agent slurry, adding a urea-formaldehyde adhesive, laminating a plurality of single-layer plates to form a plate blank, and pressing the plate blank into a plywood by using a microwave heating machine.
The preparation method of the nano core-shell efficient wave absorber slurry comprises the following steps:
the core-shell nano material consists of central particles and a coating layer, wherein the core is connected with the shell through physical or chemical action;
and mixing the core-shell nano material with deionized water according to the mass ratio of 1:20 to obtain the nano material.
The central particles are silicon carbide particles.
The coating layer is made of cyclodextrin loaded outer layer particles, and the outer layer particles are one or more of iron, cobalt and nickel.
The mol ratio of the cyclodextrin to the silicon carbide particles to the outer layer particles is 1: 1.1: 0.22.
the preparation method of the urea-formaldehyde adhesive comprises the following steps:
adding formaldehyde into a reaction kettle, adjusting the pH value to 7.1, adding a first batch of urea and cerium oxide, heating to 80 ℃, keeping the temperature for 30min, adjusting the pH value to 5.0, stirring for 40min, then adding a second batch of urea and rosin resin, adjusting the pH value to 7.0, cooling to 65 ℃, continuing stirring for 2 h, cooling to 45 ℃, and discharging.
The molar ratio of the formaldehyde to the urea is 1.48: 1, and the adding mass ratio of the first batch of urea to the second batch of urea is 1: 2;
cerium oxide accounts for 1 percent of the mass of the urea;
the mass ratio of the rosin to the urea is 1: 5.
The rosin resin is hydrogenated rosin resin.
The hydrogenated rosin resin contains 75% of dihydroabietic acid, and has a relative density of 1.045, a softening point of 72 ℃, an acid value of 162mgKOH/g and a saponification value of 167 mgKOH/g.
The pressing pressure is 7MPa, the temperature is 170 ℃, and the time is 1.5 min.
Example 6
A preparation method of a low-carbon formaldehyde-free ecological plate comprises the step of coating a single-layer plate according to the coating amount of 2.5g/m3Coating the nano core-shell high-efficiency wave absorbing agent slurry, adding a urea-formaldehyde adhesive, laminating a plurality of single-layer plates to form a plate blank, and pressing the plate blank into a plywood by using a microwave heating machine.
The preparation method of the nano core-shell efficient wave absorber slurry comprises the following steps:
the core-shell nano material consists of central particles and a coating layer, wherein the core is connected with the shell through physical or chemical action;
and mixing the core-shell nano material with deionized water according to the mass ratio of 1:20 to obtain the nano material.
The central particles are silicon carbide particles.
The coating layer is made of cyclodextrin loaded outer layer particles, and the outer layer particles are one or more of iron, cobalt and nickel.
The mol ratio of the cyclodextrin to the silicon carbide particles to the outer layer particles is 1: 1.2: 0.25.
the preparation method of the urea-formaldehyde adhesive comprises the following steps:
adding formaldehyde into a reaction kettle, adjusting the pH value to 7.1, adding a first batch of urea and cerium oxide, heating to 80 ℃, keeping the temperature for 30min, adjusting the pH value to 5.0, stirring for 40min, then adding a second batch of urea and rosin resin, adjusting the pH value to 7.0, cooling to 65 ℃, continuing stirring for 2 h, cooling to 45 ℃, and discharging.
The molar ratio of the formaldehyde to the urea is 1.48: 1, and the adding mass ratio of the first batch of urea to the second batch of urea is 1: 2;
cerium oxide accounts for 1 percent of the mass of the urea;
the mass ratio of the rosin to the urea is 1: 5.
The rosin resin is hydrogenated rosin resin.
The hydrogenated rosin resin contains 75% of dihydroabietic acid, and has a relative density of 1.045, a softening point of 72 ℃, an acid value of 162mgKOH/g and a saponification value of 167 mgKOH/g.
The pressing pressure is 8MPa, the temperature is 180 ℃, and the pressing time is 2 min.
Test of
The adhesive strength of the examples and comparative examples was tested with reference to the method for measuring the adhesive strength of ordinary plywood as defined in GB9846.2, and compared:
TABLE 1
| Bonding strength/MPa | |
| Example 1 | 1.62 |
| Example 2 | 1.65 |
| Example 3 | 1.66 |
| Example 4 | 1.69 |
| Example 5 | 1.71 |
| Example 6 | 1.70 |
| Comparative example 1 | 1.21 |
| Comparative example 2 | 1.43 |
Comparative example 1: the difference from the example 1 is that no cerium oxide is added in the preparation process of the urea-formaldehyde adhesive;
comparative example 2: the difference from the example 1 is that no rosin resin is added in the preparation process of the urea-formaldehyde adhesive;
as can be seen from Table 1, the ecological plate prepared by the method has excellent bonding strength, and the performance of the adhesive can be further improved and the bonding strength is remarkably improved by introducing a certain amount of synergistic cooperation of cerium oxide and rosin resin in the preparation process of the urea-formaldehyde adhesive.
Further experiments, the samples of the examples and the comparative examples are tested according to the national standard GB/T39598-:
TABLE 2
| Formaldehyde emission mg/m3 | |
| Example 1 | 0.00125 |
| Example 2 | 0.00132 |
| Example 3 | 0.00128 |
| Example 4 | 0.00130 |
| Example 5 | 0.00124 |
| Example 6 | 0.00125 |
| Comparative example 1 | 0.01055 |
| Comparative example 2 | 0.00984 |
| Comparative example 3 | 0.01543 |
Comparative example 1: the difference from the example 1 is that no cerium oxide is added in the preparation process of the urea-formaldehyde adhesive;
comparative example 2: the difference from the example 1 is that no rosin resin is added in the preparation process of the urea-formaldehyde adhesive;
comparative example 3: the difference from the example 1 is that the nano core-shell high-efficiency wave absorbing agent slurry is not coated;
as can be seen from Table 2, the release of formaldehyde of the ecological plate prepared by the invention is greatly inhibited, and the formaldehyde can be fixed to a great extent and the release of the formaldehyde is reduced by introducing the actions of cerium oxide, rosin resin and coating nano core-shell high-efficiency wave absorber slurry.
Further experiments, the properties of the examples and comparative examples were compared according to the national standard GB/T11718-1999:
TABLE 3
As can be seen from table 3, the ecological plate prepared by the present invention has excellent static bending strength.
Based on the sample of example 1, the influence of the mass percentage of cerium oxide in urea on the bonding strength was compared.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (10)
1. The preparation method of the low-carbon formaldehyde-free ecological plate is characterized in that a single-layer plate is coated according to the coating amount of 1.25-2.5g/m3Coating the nano core-shell high-efficiency wave absorbing agent slurry, adding a urea-formaldehyde adhesive, laminating a plurality of single-layer plates to form a plate blank, and pressing the plate blank into a plywood by using a microwave heating machine.
2. The method for preparing the low-carbon aldehyde-free ecological plate according to claim 1, which is characterized in that: the preparation method of the nano core-shell efficient wave absorber slurry comprises the following steps:
the core-shell nano material consists of central particles and a coating layer, wherein the core is connected with the shell through physical or chemical action;
and mixing the core-shell nano material with deionized water according to the mass ratio of 1:20 to obtain the nano material.
3. The method for preparing the low-carbon aldehyde-free ecological plate as claimed in claim 2, wherein the central particles are silicon carbide particles.
4. The method for preparing the low-carbon aldehyde-free ecological plate as claimed in claim 3, wherein the coating layer is made of cyclodextrin loaded outer layer particles, and the outer layer particles are one or more of iron, cobalt and nickel.
5. The method for preparing the low-carbon aldehyde-free ecological plate according to claim 4, wherein the method comprises the following steps: the mol ratio of the cyclodextrin to the silicon carbide particles to the outer layer particles is 1: 1-1.2: 0.10-0.25.
6. The method for preparing the low-carbon aldehyde-free ecological plate according to claim 1, which is characterized in that: the preparation method of the urea-formaldehyde adhesive comprises the following steps:
adding formaldehyde into a reaction kettle, adjusting the pH value to 7.1, adding a first batch of urea and cerium oxide, heating to 80 ℃, keeping the temperature for 30min, adjusting the pH value to 5.0, stirring for 40min, then adding a second batch of urea and rosin resin, adjusting the pH value to 7.0, cooling to 65 ℃, continuing stirring for 2 h, cooling to 45 ℃, and discharging.
7. The method for preparing the low-carbon aldehyde-free ecological plate as claimed in claim 6, wherein the molar ratio of the formaldehyde to the urea is 1.48: 1, and the mass ratio of the first urea to the second urea is 1: 2;
cerium oxide accounts for 1 percent of the mass of the urea;
the mass ratio of the rosin to the urea is 1: 5.
8. The method for preparing the low-carbon aldehyde-free ecological plate as claimed in claim 6, wherein the rosin resin is hydrogenated rosin resin.
9. The method for preparing a low-carbon aldehyde-free ecological plate according to claim 1, wherein the hydrogenated rosin resin contains 75% dihydroabietic acid, has a relative density of 1.045, a softening point of 72 ℃, an acid value of 162mgKOH/g, and a saponification value of 167 mgKOH/g.
10. The method as claimed in claim 1, wherein the pressing pressure is 5-8MPa, the temperature is 150-180 ℃, and the pressing time is 1-2 min.
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