CN111363469A

CN111363469A - Environment-friendly interior wall heat-insulating coating and preparation method thereof

Info

Publication number: CN111363469A
Application number: CN202010324430.4A
Authority: CN
Inventors: 杨静丽
Original assignee: Guangzhou Zuiyang Environmental Protection Technology Co ltd
Current assignee: Guangzhou Zuiyang Environmental Protection Technology Co ltd
Priority date: 2020-04-22
Filing date: 2020-04-22
Publication date: 2020-07-03

Abstract

The invention discloses an environment-friendly interior wall heat-insulating coating which comprises the following components in percentage by weight: 15-25% of cork powder, 10-20% of waterborne polyurethane, 10-18% of shell powder, 14-24% of an auxiliary agent and the balance of water. The cork powder and the shell powder which account for a large proportion in the formula of the invention are natural environment-friendly materials, and the coating does not contain organic solvent, is healthy and has no pollution. The cork powder is prepared from waste wine cork, and the cell structure of the cork powder filled with air endows the cork powder with excellent heat insulation performance, has good compatibility with waterborne polyurethane and high elasticity, and can effectively solve the problems of coating cracking and the like. The shell powder is made of shells of shellfish organisms, and has the characteristics of removing formaldehyde, purifying air, preventing fire and retarding flame.

Description

Environment-friendly interior wall heat-insulating coating and preparation method thereof

Technical Field

The invention belongs to the technical field of interior wall coatings, and particularly relates to an environment-friendly interior wall heat-insulating coating and a preparation method thereof.

Background

China is a large wine consumption country, and data display of international grape and wine organizations is as follows: in 2018, China consumes 18 hundred million liters of wine. The consumption of a large amount of wine also means the mass production of wine bottles and bottle stoppers, and how to recycle the wine bottles and the bottle stoppers is a thought environmental protection subject.

The bottle stopper of wine is generally a cork stopper, and is made of cork. Microscopically, cork consists of many flat cells arranged radially, the cavities of which are filled with air, which is a poor conductor of electricity, heat and sound, and more than 5000 ten thousand cells per 1 cubic centimeter of cork, so that the powder made of cork can be regarded as a kind of hollow particles filled with air.

Under the vacuum state, molecular vibration heat conduction and convection heat conduction between substances can completely disappear, and by utilizing the characteristics, the high-performance heat-insulating material, namely the ceramic microbubble heat-insulating and heat-preserving paint, which is formed by filling hollow ceramic microspheres with the particle size of 6-10 mu m in a latex base material appears in the seventies of the last century. Therefore, the preparation of the heat-insulating coating with excellent performance by using the hollow particles as the filler becomes a hotspot of the research of the coating with special functions.

Patent CN201810759218.3 uses organic resin and hollow glass beads to prepare interior wall heat-insulating paint, and patent CN201310188539.X uses organic resin and borosilicate rock hollow beads to prepare interior wall heat-insulating paint. However, the resin proportion in the two patents is very high, and the proportion of the hollow microspheres is very small, and is less than 10 percent, because the compatibility of the hollow microspheres made of inorganic materials in organic resin is poor, and the mechanical property of the coating is poor if the content of the hollow microspheres is too high.

Disclosure of Invention

In order to solve the defects in the prior art, the invention aims to provide an environment-friendly interior wall heat-insulating coating and a preparation method thereof. The cork powder prepared from the waste wine cork is used as the thermal insulation material of the coating, the compatibility of the cork powder and waterborne polyurethane is good, the mechanical property of the coating cannot be influenced even if the content of the cork powder is high, the porous cell structure of the cork has natural elasticity, and the mechanical property of the coating can be improved after the cork powder is crosslinked with the waterborne polyurethane.

In order to achieve the purpose, the technical scheme adopted by the invention comprises the following aspects:

an environment-friendly interior wall heat-insulating coating comprises the following components in percentage by weight: 15-25% of cork powder, 10-20% of waterborne polyurethane, 10-18% of shell powder, 14-24% of an auxiliary agent and the balance of water.

According to researches, the cork powder and the waterborne polyurethane have good compatibility, and the mechanical property of the coating can be improved after the cork powder and the waterborne polyurethane are crosslinked. The dosage of the cork powder in the coating of the invention is up to 15-25 percent, while the dosage of the waterborne polyurethane is 10-20 percent, and the coating layer of the coating has excellent heat-insulating property and excellent mechanical property,

most preferably, the weight ratio of cork powder to aqueous polyurethane is 4: 3. Under the proportion, the coating layer of the coating is balanced in two aspects of heat insulation and mechanics, and the comprehensive performance of the coating layer is optimal.

The shell powder is made of shells of shellfish organisms, is a natural environment-friendly material, and has the effects of removing formaldehyde, purifying air, preventing fire and retarding flame. The mechanical property of the coating can be reduced by adding too much shell powder, and the effective air purifying, fireproof and flame-retardant effects cannot be achieved by adding too little shell powder. When the shell powder is added according to the formula amount, the air purifying effect and the fireproof flame-retardant effect of the coating are good, and the mechanical property of the coating is not influenced.

Preferably, the auxiliary agent is titanium dioxide, aluminum magnesium silicate, a dispersing agent and a bactericide.

Preferably, the weight percentage content of the titanium dioxide in the paint is 5-10%.

Preferably, the weight percentage content of the aluminum magnesium silicate in the coating is 5-10%.

Preferably, the dispersant is present in the coating in an amount of 2% by weight.

Preferably, the dispersant is sodium alkyl sulfonate, preferably sodium stearyl sulfonate.

Preferably, the weight percentage of the bactericide in the paint is 2%.

Preferably, the bactericide is an oily wood bactericide, more preferably Federal S-547.

Preferably, the particle size of the cork powder is 500-800 meshes. The particle size of cork powder affects the heat insulating properties and workability of the coating. When 500-800-mesh cork powder is used, the coating has excellent heat-insulating property and good construction property and compatibility.

Preferably, the particle size of the shell powder is 800-1200 meshes. The shell powder with the particle size has a good using effect.

Preferably, the aqueous polyurethane is an aqueous polyurethane emulsion with a solid content of 30%. The solid content of the aqueous polyurethane emulsion is too high, so that the aqueous polyurethane emulsion is easy to agglomerate in the synthesis process; if the solid content is too low, the cost increases. The aqueous polyurethane emulsion with the solid content of 30 percent is not easy to agglomerate in the synthesis process, and the use cost is lower.

The synthetic method of the waterborne polyurethane comprises the following steps: putting dried PEG600 (polyethylene glycol 600) into a reaction kettle, heating to 80 ℃, adding isophorone diisocyanate, dripping dibutyltin dilaurate, and reacting for 4h at 80 ℃; then cooling to 60 ℃, adding dried dimethylolbutyric acid or dimethylolpropionic acid, and reacting for 30 min; adding triethylamine to adjust the pH value to 6.5-7.5, adding water into the prepolymer under high-speed stirring, and emulsifying for 20 min; and removing acetone by rotary evaporation to obtain the aqueous polyurethane emulsion.

Preferably, in the synthetic method of the waterborne polyurethane, the mass ratio of PEG600 to isophorone diisocyanate to dimethylol butyric acid or dimethylol propionic acid is 42:47:11, and the using amount of dibutyltin dilaurate is 0.05% of the mass of all reactants.

The preparation method of the cork powder comprises the following steps: screening and classifying the recycled cork, cleaning, boiling in boiling water for 7-12 h, drying, and crushing to obtain cork powder.

The preparation method of the shell powder comprises the following steps: screening and classifying shells, standing and aging, cleaning, drying, calcining and crushing to obtain the shell powder. Preferably, the calcination process is: the temperature is 900 ℃ and the time is 24 h.

The preparation method of the environment-friendly interior wall heat-insulating coating comprises the following steps: (1) uniformly mixing the cork powder with part of water to obtain a cork powder water dispersion; (2) uniformly mixing shell powder with part of water to obtain a shell powder water dispersion; (3) mixing the cork powder aqueous dispersion, the shell powder aqueous dispersion, the titanium dioxide, the aluminum-magnesium silicate and the bactericide, adding the dispersant while stirring, then adding the waterborne polyurethane, stirring uniformly, and finally adding the balance of water to adjust the viscosity, thereby preparing the environment-friendly interior wall heat-insulating coating.

When the coating is prepared, the cork powder and the shell powder are respectively prepared into water dispersion, and then are mixed with other components, so that the cork powder and the shell powder can be prevented from being bonded, and the cork powder and the shell powder can be easily and uniformly dispersed in a system.

Compared with the prior art, the invention has the following advantages:

1) in the formula of the invention, the cork powder and the shell powder which account for the largest proportion are both natural environment-friendly materials. The cork powder is made of waste wine cork, and the cell structure filled with air endows the cork powder with excellent heat insulation performance, is rich in elasticity, and can effectively solve the problems of coating cracking and the like. The shell powder is made of shells of shellfish organisms, and has the characteristics of removing formaldehyde, purifying air, preventing fire and retarding flame.

2) Compared with other interior wall heat-insulating coatings, the coating has the advantages of high content of heat-insulating materials and good heat-insulating effect. According to the invention, the cork powder is used for replacing an inorganic hollow microsphere material, the cork powder is an organic matter containing a large amount of hydroxyl, is good in compatibility with waterborne polyurethane, has a high proportion, does not influence the mechanical property of a coating, can be filled and used in a large amount, but simultaneously needs to improve the color of the coating by using titanium dioxide, and needs to add a bactericide to prolong the service life of the cork powder.

3) The coating disclosed by the invention is a water-based system, does not contain organic solvents such as formaldehyde and the like, is small in construction smell, and is healthy and environment-friendly.

Detailed Description

To better illustrate the objects, aspects and advantages of the present invention, the present invention is further illustrated by the following examples. It is apparent that the following examples are only a part of the embodiments of the present invention, and not all of them. It should be understood that the embodiments of the present invention are only for illustrating the technical effects of the present invention, and are not intended to limit the scope of the present invention.

Examples 1 to 5:

examples 1 to 5 provide an environmentally friendly interior wall thermal insulation coating, whose formulation composition is shown in table 1.

TABLE 1 coating formulations

Note: in the table, "-" indicates that the component was not added.

The preparation method of the environment-friendly interior wall heat-insulating coating of the embodiments 1 to 5 includes the following steps:

(1) mixing and stirring the cork powder and water uniformly according to the weight ratio of 1:1 to obtain a cork powder water dispersion;

(2) mixing and stirring shell powder and water uniformly according to the weight ratio of 1:1 to obtain a shell powder water dispersion;

(3) mixing the cork powder aqueous dispersion, the shell powder aqueous dispersion, the titanium pigment, the aluminum magnesium silicate and the Federal s-547, adding the sodium octadecyl sulfonate under high-speed stirring, then adding the aqueous polyurethane emulsion, stirring at high speed for 30min to uniformly mix the materials, and finally adding the rest water to adjust the viscosity, thereby preparing the environment-friendly interior wall heat-insulating coating.

The preparation method of the cork powder comprises the following steps: screening and classifying the recovered wine cork, and removing the cork seriously polluted; and (3) washing the screened cork stopper, boiling the cork stopper in boiling water for 7-12 hours, and crushing the cork stopper by using a crusher after completely drying to obtain cork stopper powder.

The preparation method of the shell powder comprises the following steps: screening and classifying shells, and removing the severely polluted shells; and (3) placing the screened shell for aging for 200 days, washing the shell with sand, drying the washed shell, calcining the washed shell at 900 ℃ for 24 hours, and crushing the shell by using a crusher to obtain the shell powder.

The synthetic method of the waterborne polyurethane comprises the following steps: putting a certain amount of dried PEG600 into a reaction kettle, heating to 80 ℃, stirring and mixing uniformly, adding metered isophorone diisocyanate, dripping a small amount of dibutyltin dilaurate, and reacting for 4 hours at 80 ℃; then cooling to 60 ℃, adding a proper amount of dried dimethylolbutyric acid or dimethylolpropionic acid, and reacting for 30 min; adding triethylamine to adjust the pH value to 6.5-7.5, adding water into the prepolymer under high-speed stirring, and emulsifying for 20 min; and removing acetone by rotary evaporation to obtain the aqueous polyurethane emulsion with the solid content of 30%. In the synthesis method, the mass ratio of the PEG600 to the isophorone diisocyanate to the dimethylol succinic acid (propionic acid) is 42:47: 11; dibutyltin dilaurate was used in an amount of 0.05% by mass of all reactants.

Comparative example 1 provides a coating material containing no cork powder, whose formulation composition is shown in table 1, and whose preparation method is according to the preparation methods of examples 1 to 5.

The coatings obtained in examples 1-5 and comparative example 1 were tested according to the part of the heat-insulating midway paint in the national standard GB/T25261-2018, and the test results are shown in Table 2:

TABLE 2 paint functionality requirement and basic Performance requirement test results

And (4) analyzing results: the coatings of the embodiments 1 to 5 have good heat insulation performance and mechanical property, and other basic properties can also meet the use requirements. Comparing examples 1 to 3, it can be seen that example 2 is the most excellent in terms of both heat insulating properties and adhesive strength, and thus the optimum ratio of cork powder to aqueous polyurethane is 4:3 (weight ratio). Comparing example 1, example 4 and example 5, it can be seen that the heat insulation performance and mechanical property of the coating can not be affected significantly when the amount of the shell powder is varied within the range of 10% to 18%. Comparing example 1 with comparative example 1, it can be seen that the thermal insulation performance of the coating of comparative example 1 is significantly reduced and the mechanical properties of the coating are also significantly reduced mainly due to the absence of the cork powder, which shows that the thermal insulation performance of the coating can be significantly improved by adding the cork powder, and the mechanical properties of the coating can be significantly improved after the cork powder is crosslinked with the waterborne polyurethane.

The particle size of the cork powder was tested for its effect on the properties of the coating:

the test groups in table 3 are designed, the coatings are prepared by adopting the cork powder with the corresponding mesh number of each test group and referring to the formula and the preparation method of the example 1, the workability and the thermal conductivity coefficient of the coatings obtained by each test group are tested according to the national standard GB/T25261-2018, and the test results are shown in table 4.

TABLE 3 mesh number of cork powders used in test groups 1-7

Group of	The mesh number of the cork powder
		Test group 1	100 mesh
Test group 2	400 mesh
		Test group 3	500 mesh
Test group 4	650 mesh
		Test group 5	800 mesh
Test group 6	900 mesh screen
		Test group 7	1000 mesh

TABLE 4 influence of cork powder mesh number on coating properties

From the test results of test groups 1 to 7, it can be seen that: the larger the particle size of the cork powder is, the smaller the heat conductivity coefficient is, and the better the heat insulation effect is; the smaller the particle size of the cork powder is, the larger the heat conductivity coefficient is, and the poorer the heat insulation effect is; however, when the particle size of the cork powder is larger than 500 mesh, the reduction range of the thermal conductivity coefficient becomes small and tends to be smooth (see test group 1 and test group 2); when the particle size of the cork powder is smaller than 800 mesh, the thermal conductivity increases and the reduction of the heat insulation effect becomes more remarkable (see test group 6 and test group 7). In addition, when the particle size of the cork powder is more than 500 mesh, the compatibility is deteriorated, and the coating material has a hard lump after stirring, which is in an uneven state, and the workability is poor. Therefore, the cork powder is combined with various performances, the particle size of the cork powder is preferably 500-800 meshes, and the cork powder has low thermal conductivity and good construction performance and can meet the use requirements.

Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting the protection scope of the present invention, and although the present invention is described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions can be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention.

Claims

1. The environment-friendly interior wall heat-insulating coating is characterized by comprising the following components in percentage by weight: 15-25% of cork powder, 10-20% of waterborne polyurethane, 10-18% of shell powder, 14-24% of an auxiliary agent and the balance of water.

2. The environment-friendly interior wall thermal insulation coating of claim 1, wherein the weight ratio of the cork powder to the aqueous polyurethane is 4: 3.

3. The environment-friendly interior wall thermal insulation coating of claim 1, wherein the cork powder has a particle size of 500 to 800 mesh.

4. The environment-friendly interior wall heat-insulating coating material of claim 1, wherein the aqueous polyurethane is an aqueous polyurethane emulsion; preferably, the solid content of the aqueous polyurethane emulsion is 30%.

5. The environment-friendly interior wall heat-insulating coating as claimed in claim 1, wherein the auxiliary agent is titanium dioxide, aluminum magnesium silicate, a dispersant and a bactericide;

preferably, the weight percentage content of the titanium dioxide in the paint is 5-10%;

preferably, the weight percentage content of the aluminum magnesium silicate in the coating is 5% -10%;

preferably, the weight percentage content of the dispersant in the coating is 2%;

preferably, the weight percentage of the bactericide in the paint is 2%.

6. The environment-friendly interior wall heat-insulating coating material of claim 5, wherein the dispersant is sodium alkylsulfonate; more preferably, the dispersant is sodium stearyl sulfonate.

7. The environment-friendly interior wall thermal insulation coating material according to claim 5, wherein the bactericide is an oily wood bactericide; more preferably, the fungicide is Federal s-547.

8. The preparation method of the environment-friendly interior wall heat-insulating coating as claimed in any one of claims 1 to 7, characterized by comprising the following steps:

(1) uniformly mixing the cork powder with part of water to obtain a cork powder water dispersion;

(2) uniformly mixing shell powder with part of water to obtain a shell powder water dispersion;

(3) mixing the cork powder aqueous dispersion, the shell powder aqueous dispersion, the titanium dioxide, the aluminum-magnesium silicate and the bactericide, adding the dispersant while stirring, then adding the waterborne polyurethane, stirring uniformly, and finally adding the balance of water to adjust the viscosity, thereby preparing the environment-friendly interior wall heat-insulating coating.

9. The method for preparing the environment-friendly interior wall thermal insulation coating according to claim 8, wherein the cork powder is prepared by the following steps: screening and classifying the recycled cork, cleaning, boiling in boiling water for 7-12 h, drying, and crushing to obtain cork powder.

10. The preparation method of the environment-friendly interior wall heat-insulating coating as claimed in claim 8, wherein the preparation method of the shell powder comprises the following steps: screening and classifying shells, standing and aging, cleaning, drying, calcining and crushing to obtain shell powder; preferably, the particle size of the shell powder is 800-1200 meshes; preferably, the calcination process is: the temperature is 900 ℃ and the time is 24 h.