CN108530974B - Application of aromatic polyamide material in water-based paint filler - Google Patents
Application of aromatic polyamide material in water-based paint filler Download PDFInfo
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- CN108530974B CN108530974B CN201810075464.7A CN201810075464A CN108530974B CN 108530974 B CN108530974 B CN 108530974B CN 201810075464 A CN201810075464 A CN 201810075464A CN 108530974 B CN108530974 B CN 108530974B
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 88
- 239000004760 aramid Substances 0.000 title claims abstract description 74
- 229920003235 aromatic polyamide Polymers 0.000 title claims abstract description 74
- 239000003973 paint Substances 0.000 title claims abstract description 63
- 239000000463 material Substances 0.000 title claims abstract description 51
- 239000000945 filler Substances 0.000 title claims abstract description 25
- 239000006185 dispersion Substances 0.000 claims abstract description 12
- 238000000034 method Methods 0.000 claims abstract description 9
- 239000007788 liquid Substances 0.000 claims abstract description 5
- ZMXDDKWLCZADIW-UHFFFAOYSA-N N,N-Dimethylformamide Chemical compound CN(C)C=O ZMXDDKWLCZADIW-UHFFFAOYSA-N 0.000 claims description 21
- 229920005989 resin Polymers 0.000 claims description 15
- 239000011347 resin Substances 0.000 claims description 15
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 12
- 150000001875 compounds Chemical class 0.000 claims description 10
- 239000002904 solvent Substances 0.000 claims description 8
- 238000005406 washing Methods 0.000 claims description 8
- 150000001263 acyl chlorides Chemical class 0.000 claims description 6
- -1 aromatic primary amine compound Chemical class 0.000 claims description 6
- 238000000227 grinding Methods 0.000 claims description 6
- 239000000203 mixture Substances 0.000 claims description 6
- 239000012265 solid product Substances 0.000 claims description 6
- UHOVQNZJYSORNB-UHFFFAOYSA-N benzene Substances C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 claims description 5
- YBRVSVVVWCFQMG-UHFFFAOYSA-N 4,4'-diaminodiphenylmethane Chemical compound C1=CC(N)=CC=C1CC1=CC=C(N)C=C1 YBRVSVVVWCFQMG-UHFFFAOYSA-N 0.000 claims description 4
- IAZDPXIOMUYVGZ-UHFFFAOYSA-N Dimethylsulphoxide Chemical compound CS(C)=O IAZDPXIOMUYVGZ-UHFFFAOYSA-N 0.000 claims description 4
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 4
- 239000011324 bead Substances 0.000 claims description 4
- 239000008367 deionised water Substances 0.000 claims description 4
- 229910021641 deionized water Inorganic materials 0.000 claims description 4
- 230000007935 neutral effect Effects 0.000 claims description 4
- 239000006228 supernatant Substances 0.000 claims description 4
- FXHOOIRPVKKKFG-UHFFFAOYSA-N N,N-Dimethylacetamide Chemical compound CN(C)C(C)=O FXHOOIRPVKKKFG-UHFFFAOYSA-N 0.000 claims description 3
- SECXISVLQFMRJM-UHFFFAOYSA-N N-Methylpyrrolidone Chemical compound CN1CCCC1=O SECXISVLQFMRJM-UHFFFAOYSA-N 0.000 claims description 2
- 239000007864 aqueous solution Substances 0.000 claims description 2
- 230000003472 neutralizing effect Effects 0.000 claims description 2
- RVTZCBVAJQQJTK-UHFFFAOYSA-N oxygen(2-);zirconium(4+) Chemical compound [O-2].[O-2].[Zr+4] RVTZCBVAJQQJTK-UHFFFAOYSA-N 0.000 claims description 2
- 229910001928 zirconium oxide Inorganic materials 0.000 claims description 2
- 238000000926 separation method Methods 0.000 claims 1
- 238000000576 coating method Methods 0.000 abstract description 15
- 239000011248 coating agent Substances 0.000 abstract description 13
- 238000002474 experimental method Methods 0.000 abstract description 2
- 239000000047 product Substances 0.000 description 13
- 229920005749 polyurethane resin Polymers 0.000 description 7
- 239000000126 substance Substances 0.000 description 6
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 5
- 238000010521 absorption reaction Methods 0.000 description 5
- 229910021389 graphene Inorganic materials 0.000 description 5
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 229910052751 metal Inorganic materials 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- 239000000243 solution Substances 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 3
- 239000011521 glass Substances 0.000 description 3
- 239000010445 mica Substances 0.000 description 3
- 229910052618 mica group Inorganic materials 0.000 description 3
- 239000000843 powder Substances 0.000 description 3
- 239000000654 additive Substances 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 239000012752 auxiliary agent Substances 0.000 description 2
- 230000004888 barrier function Effects 0.000 description 2
- UWCPYKQBIPYOLX-UHFFFAOYSA-N benzene-1,3,5-tricarbonyl chloride Chemical compound ClC(=O)C1=CC(C(Cl)=O)=CC(C(Cl)=O)=C1 UWCPYKQBIPYOLX-UHFFFAOYSA-N 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000002329 infrared spectrum Methods 0.000 description 2
- 150000003141 primary amines Chemical class 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- 238000002834 transmittance Methods 0.000 description 2
- 239000013053 water resistant agent Substances 0.000 description 2
- 239000004952 Polyamide Substances 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 125000003368 amide group Chemical group 0.000 description 1
- 125000003277 amino group Chemical group 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 239000002612 dispersion medium Substances 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000002360 explosive Substances 0.000 description 1
- 239000011256 inorganic filler Substances 0.000 description 1
- 229910003475 inorganic filler Inorganic materials 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 231100000252 nontoxic Toxicity 0.000 description 1
- 230000003000 nontoxic effect Effects 0.000 description 1
- 239000011368 organic material Substances 0.000 description 1
- 125000001997 phenyl group Chemical group [H]C1=C([H])C([H])=C(*)C([H])=C1[H] 0.000 description 1
- 239000000049 pigment Substances 0.000 description 1
- 229920002647 polyamide Polymers 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 238000000870 ultraviolet spectroscopy Methods 0.000 description 1
- 239000012855 volatile organic compound Substances 0.000 description 1
- 230000004584 weight gain Effects 0.000 description 1
- 235000019786 weight gain Nutrition 0.000 description 1
Images
Classifications
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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
- C08G69/00—Macromolecular compounds obtained by reactions forming a carboxylic amide link in the main chain of the macromolecule
- C08G69/02—Polyamides derived from amino-carboxylic acids or from polyamines and polycarboxylic acids
- C08G69/26—Polyamides derived from amino-carboxylic acids or from polyamines and polycarboxylic acids derived from polyamines and polycarboxylic acids
- C08G69/32—Polyamides derived from amino-carboxylic acids or from polyamines and polycarboxylic acids derived from polyamines and polycarboxylic acids from aromatic diamines and aromatic dicarboxylic acids with both amino and carboxylic groups aromatically bound
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- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Paints Or Removers (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Abstract
The invention provides an application of an aromatic polyamide material in a water-based paint filler, belonging to the technical field of water-based paints. The invention also provides a using method of the aromatic polyamide material applied to the water-based paint filler, the prepared aromatic polyamide material is prepared into aromatic polyamide material dispersion liquid, and then the aromatic polyamide material dispersion liquid is mixed with the water-based paint. Experiments prove that after the aromatic polyamide material is used as the water-resistant filler of the water-based paint for preparing the paint, the water resistance of the obtained coating is obviously improved, and the color and the transparency of the original paint are not influenced.
Description
Technical Field
The invention belongs to the technical field of water-based paint, and particularly relates to application of an aromatic polyamide material to water-based paint or water-based resin water-resistant filler.
Background
The water paint is mainly composed of four components of water, water resin, pigment and filler, auxiliary agent and the like. Because water is used as a solvent or a dispersion medium, the water-based paint is non-toxic and environment-friendly, contains few volatile organic compounds, has small smell, is not explosive and non-combustible, and is very safe in various links such as production, storage, transportation, use and the like. Therefore, with the increasing awareness of people on safety, environmental protection and health, the water-based paint is more and more popular, and the water-based paint is a necessary trend for the development of the paint industry to replace the oil-based paint. The clear text of the city areas of more provinces and provinces in China is stipulated, and the existing oil paint is gradually changed into environment-friendly water paint. However, the water-soluble resin or water-dispersible resin used for the water-based paint has a certain hydrophilicity, and thus the water-based paint has poor water resistance. This disadvantage greatly limits the service life and the field of application of aqueous coatings. Therefore, it is an important problem in this field to solve the problem of poor water resistance of the aqueous coating material. The problems of poor water resistance, short service life, limited application range and the like of the water-based paint can be simply and efficiently improved by adding a proper amount of water-resistant additive.
Mica powder, glass flakes, aluminum powder, graphene oxide and other materials are stable in chemical property, and can generate barrier effect similar to a barrier when added into a coating, so that the transmission path of corrosive media in the coating is prolonged, the corrosion resistance of the coating against water molecules or other corrosive media is improved, the protection effect of the coating is improved, and the service life of the coating is prolonged. In the common flaky materials in the coating industry, mica powder and glass flakes belong to inorganic fillers, but the mica powder and the glass flakes have relatively high density, high oil absorption and easy formation of precipitates; the aluminum powder is a flaky metal filler, but is unstable under acidic or alkaline conditions because of being an amphoteric metal; the graphene/graphene oxide has good chemical resistance to acid, alkali, salt and the like, but the graphene/graphene oxide is black, so that the colorless or light-colored paint is easily colored.
Particularly for water-based coatings with transparency requirements, no filler has been reported, which cannot change or affect the transparency of the original coating due to the addition of a water-resistant agent.
The subject group of the teaching of Xuyu xi of the university of Compound Dan takes 1,3, 5-benzene tricarboxychloride as a raw material to react with 1, 4-p-phenylenediamine and 4,4' -diaminodiphenylmethane respectively to prepare two aromatic polyamide two-dimensional materials. The chemical composition of the material is characterized and the microscopic morphology of the material is confirmed by testing means such as an infrared spectrometer, an atomic force microscope, a transmission electron microscope, a scanning electron microscope and the like. The two-dimensional aromatic polyamide has the following structural formula:
however, no relevant documents or reports about the application of aromatic polyamide as a water-resistant agent in the field of water-based paint exist so far.
See literature: yang, F.X, Bu, J.J.Liu, I.Shakir and Y.X.Xu.mechanical synthesis of two-dimensional aromatic polyamides [ J ]. Chemical Communications,2017,53(54):7481-7484.
Disclosure of Invention
The invention aims to apply an aromatic polyamide material to a water-resistant filler of a water-based paint.
Experiments prove that after the aromatic polyamide material is used as the water-resistant filler of the water-based paint for preparing the paint, the water resistance of the obtained coating is obviously improved, and the color and the transparency of the original paint are not influenced.
The application of the aromatic polyamide material to the water-based paint filler is characterized in that the aromatic polyamide material is a mixture containing an aromatic polyamide compound, and the structure of the aromatic polyamide compound is shown as the following formula:
r is selected from
The aromatic polyamide material is prepared by the following method:
adding zirconium oxide beads with the diameter of 5mm into a grinding tank, and then adding 1,3, 5-benzene trimethyl acyl chloride and a multifunctional aromatic primary amine compound, wherein the feeding molar ratio of the 1,3, 5-benzene trimethyl acyl chloride to the multifunctional aromatic primary amine compound is 0.5-0.99:1.0, and the multifunctional aromatic primary amine compound is any one of 1, 4-p-phenylenediamine and 4,4' -diaminodiphenylmethane;
then, grinding the mixture by a ball mill for 3 to 10 minutes at the speed of 600-900 rpm to obtain the aromatic polyamide material, wherein the mass percentage of the aromatic polyamide compound is 75 to 85 percent.
The aromatic polyamide material is applied to a water-based paint filler, and is further mixed with any one of water-based resin, paint auxiliary agents and additives to prepare a paint.
The filler is used for improving the water resistance of the water-based paint or the water-based resin and prolonging the service life.
The aromatic polyamide material provided by the invention can be applied to a water-based paint filler to obviously improve the water resistance of the paint, has good dispersion stability and stable chemical properties in a water-based paint/water-based resin, and does not influence the color and transparency of the original paint after being added.
The application method of the aromatic polyamide material in the water-based paint filler comprises the steps of preparing the prepared aromatic polyamide material into aromatic polyamide material dispersion liquid, and then mixing the aromatic polyamide material with the water-based paint.
The application method of the aromatic polyamide material applied to the water-based paint filler further comprises the following preparation steps of:
neutralizing the prepared aromatic polyamide material with a 5 wt% sodium hydroxide aqueous solution, separating by using a centrifuge, washing a separated solid product with absolute ethyl alcohol until a supernatant is colorless, washing with deionized water until a water phase is neutral, and dispersing the washed solid product in a solvent to prepare the aromatic polyamide material dispersion liquid with the concentration of (1-3) mg/mL, wherein the solvent is any one or a mixture of N, N-dimethylformamide, N-dimethylacetamide, dimethylsulfoxide and N-methylpyrrolidone.
The application method of the aromatic polyamide material in the water-based paint filler is characterized in that the aromatic polyamide material accounts for 0.1-0.3% of the mass of the water-based resin in the water-based paint, wherein the mass of the water-based resin accounts for 20-90% of the mass of the water-based paint.
The aromatic polyamide compound is two-dimensional aromatic polyamide, has a regular rigid annular skeleton molecular structure and a large diameter-thickness ratio, is a two-dimensional organic material with excellent mechanical property, heat resistance and chemical stability, and can be well dispersed in N, N-dimethylformamide. The synthesized aromatic polyamide has small density (about 1000 kg/m)3) The water-resistant filler has relatively narrow size distribution, large ratio of diameter to thickness and good dispersibility in a solvent, and is ideal in the field of water-based resin or water-based paint.
Compared with the existing coating waterproof filler, the aromatic polyamide is less in added parts by weight, good in dispersion and storage stability, and does not affect the color and transparency of the water-based coating after film formation.
In addition, the aromatic polyamide material has poor conductivity and does not react with metal to form a primary battery, so that the water-based paint added with a small amount of the aromatic polyamide material does not affect the corrosion resistance of the metal substrate.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a Scanning Electron Microscope (SEM) picture of the aromatic polyamide produced in example 1.
FIG. 2 is an infrared spectrum of the aromatic polyamide produced in example 1.
FIG. 3 is a photograph showing the effect of the aromatic polyamide prepared in example 1 on N, N-dimethylformamide (left) for 1 week and on an aqueous polyurethane resin (right) for 1 month.
The concentration of the aromatic polyamide prepared in example 1 in N, N-dimethylformamide was 2mg/mL, and the amount of the aromatic polyamide prepared in example 1 added was 0.3% by mass of the aqueous polyurethane resin.
FIG. 4 is a graph showing the effect of the aromatic polyamide prepared in example 1 on the transparency of an aqueous polyurethane resin.
FIG. 5 is a graph showing the influence of the amount of 0.1% of the aromatic polyamide produced in example 1 on the water diffusion resistance of the aqueous polyurethane resin.
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.
The following specific examples are provided to further illustrate the invention.
Example 1:
1) zirconia beads 5mm in diameter were added to the jar, followed by 1,3, 5-benzenetricarboxylic acid chloride and 1, 4-p-phenylenediamine. Grinding for 10 minutes by a ball mill at the speed of 600 revolutions per minute; and controlling the feeding molar ratio of acyl chloride to primary amine to be 0.99:1.0 to obtain a product, wherein the mass of the aromatic polyamide compound in the product accounts for 80%.
As shown in the microscopic appearance of the product in figure 1, the scale in the figure is 100 μm, the aromatic polyamide of the product has a lamellar structure, the side length is below 20-30 μm, and the size dispersibility is small. FIG. 2 is a Fourier infrared spectrum of the dried product at a wavenumber of 3300cm-1The absorption peak at (A) is ascribed to the absorption peak of the amine group at a wave number of 1650cm-1The absorption peak at (A) is ascribed to C ═ O in the amide group, and the wave number is 1510cm-1The absorption peak at (a) is attributed to C ═ C bond in the benzene ring structure, indicating that the obtained product is the target product.
2) The product was first neutralized with 15mL of 5% aqueous sodium hydroxide solution and then separated by a centrifuge. Washing the obtained solid product with absolute ethyl alcohol until the supernatant is colorless, and then washing with deionized water until the water phase is neutral. Then, the product was dispersed in N, N-dimethylformamide (prepared at a concentration of 2mg/mL) as a solvent for use.
3) The dispersion is mixed with water-based resin (the mass fraction of the aromatic polyamide added water-based paint is 0.1%), and after a paint film is dried, the water-resistant time is increased by 30% compared with that of a paint film without the aromatic polyamide material.
As shown in FIG. 3, the dispersion was left alone for 1 week and 1 month, respectively, and the appearance was not significantly changed, and the aromatic polyamide was well dispersed in N, N-dimethylformamide and the aqueous polyurethane resin and was storage-stable.
The two curves in FIG. 4 show the transparency of the film formed from the aqueous polyurethane resin with the polyamide layer added in amounts of 0.0 wt% and 0.3 wt%, respectively, as measured by UV spectroscopy, and the light transmittance of the dried film at a visible wavelength of 600nm is 89.2% and 78.9%, respectively, indicating that the transparency of the dried film is not substantially affected by the addition of 0.3 wt% of the aromatic polyamide to the aqueous polyurethane resin.
From the rate of weight gain of the coating of fig. 5, it can be seen that the addition of 0.1% of aromatic polyamide can significantly improve the water resistance of the aqueous resin.
Example 2:
1) zirconia beads 5mm in diameter were added to the jar, followed by 1,3, 5-benzenetricarboxylic acid chloride and 4,4' -diaminodiphenylmethane. Grinding for 3 minutes by a ball mill at the speed of 900 revolutions per minute; and controlling the feeding molar ratio of acyl chloride to primary amine to be 0.5:1.0 to obtain a product, wherein the mass of the aromatic polyamide compound in the product accounts for 82%.
2) The product was first neutralized with 15mL of 5% aqueous sodium hydroxide solution and then separated by a centrifuge. Washing the obtained solid product with absolute ethyl alcohol until the supernatant is colorless, and then washing with deionized water until the water phase is neutral. Then, the product was dispersed in N, N-dimethylacetamide (prepared at a concentration of 2mg/mL) as a solvent for use.
3) The dispersion is mixed with a water-based paint (0.15 percent of the aromatic polyamide layered material is added), after a paint film is dried, the light transmittance of the paint film is 79.6 percent, and the water-resistant time of the paint film is increased by 40-50 percent compared with the paint film without the prepared aromatic polyamide material.
Although the preferred embodiments of the present invention have been described in detail, the present invention is not limited to the details of the embodiments, and various equivalent modifications can be made within the technical spirit of the present invention, and the scope of the present invention is also within the scope of the present invention.
It should be noted that the various features described in the above embodiments may be combined in any suitable manner without departing from the scope of the invention. The invention is not described in detail in order to avoid unnecessary repetition. In addition, any combination of the various embodiments of the present invention is also possible, and the same should be considered as the disclosure of the present invention as long as it does not depart from the spirit of the present invention.
Claims (5)
1. The application of an aromatic polyamide material to a water-based paint waterproof filler comprises an aromatic polyamide compound, wherein the aromatic polyamide compound is a two-dimensional aromatic polyamide and has the following structure:
the aromatic polyamide material is prepared by the following method:
adding zirconium oxide beads with the diameter of 5mm into a grinding tank, and then adding 1,3, 5-benzene trimethyl acyl chloride and a multifunctional aromatic primary amine compound, wherein the feeding molar ratio of the 1,3, 5-benzene trimethyl acyl chloride to the multifunctional aromatic primary amine compound is (0.5-0.99):1, and the multifunctional aromatic primary amine compound is any one of 1, 4-p-phenylenediamine and 4,4' -diaminodiphenylmethane;
then, grinding the mixture by a ball mill for 3 to 10 minutes at the speed of 600-900 rpm to obtain the aromatic polyamide material, wherein the mass percentage of the aromatic polyamide compound is 75 to 85 percent.
2. The use of the aromatic polyamide material as claimed in claim 1 as a water-resistant filler for water-based paints, wherein the aromatic polyamide material is mixed with any one of water-based resins and paint auxiliaries to form the paint.
3. The method of using the aromatic polyamide material as claimed in claim 1 for water-based paint water-resistant filler, wherein the aromatic polyamide material is prepared as an aromatic polyamide material dispersion and then mixed with the water-based paint.
4. The method for using the aromatic polyamide material as claimed in claim 3 in the application of water-based paint water-resistant filler, characterized in that the aromatic polyamide material dispersion is prepared by the following steps:
neutralizing the aromatic polyamide material with a 5 wt% sodium hydroxide aqueous solution, separating by using a centrifuge, washing a solid product obtained by separation with absolute ethyl alcohol until a supernatant is colorless, washing with deionized water until a water phase is neutral, and dispersing the washed solid product in a solvent to obtain the aromatic polyamide material dispersion liquid with the concentration of (1-3) mg/mL, wherein the solvent is any one or a mixture of N, N-dimethylformamide, N-dimethylacetamide, dimethyl sulfoxide and N-methylpyrrolidone.
5. The method for using the aromatic polyamide material in the water-based paint waterproof filler according to claim 4, wherein the aromatic polyamide material accounts for 0.1-0.3% of the mass of the water-based resin in the water-based paint, and the water-based resin accounts for 20-90% of the mass of the water-based paint.
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