CN112358797B - Preparation method of water-based paint coating - Google Patents
Preparation method of water-based paint coating Download PDFInfo
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- CN112358797B CN112358797B CN202011632251.3A CN202011632251A CN112358797B CN 112358797 B CN112358797 B CN 112358797B CN 202011632251 A CN202011632251 A CN 202011632251A CN 112358797 B CN112358797 B CN 112358797B
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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
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D167/00—Coating compositions based on polyesters obtained by reactions forming a carboxylic ester link in the main chain; Coating compositions based on derivatives of such polymers
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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
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D129/00—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an alcohol, ether, aldehydo, ketonic, acetal, or ketal radical; Coating compositions based on hydrolysed polymers of esters of unsaturated alcohols with saturated carboxylic acids; Coating compositions based on derivatives of such polymers
- C09D129/02—Homopolymers or copolymers of unsaturated alcohols
- C09D129/04—Polyvinyl alcohol; Partially hydrolysed homopolymers or copolymers of esters of unsaturated alcohols with saturated carboxylic acids
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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
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/60—Additives non-macromolecular
- C09D7/61—Additives non-macromolecular inorganic
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- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
- D01D5/00—Formation of filaments, threads, or the like
- D01D5/0007—Electro-spinning
- D01D5/0015—Electro-spinning characterised by the initial state of the material
- D01D5/003—Electro-spinning characterised by the initial state of the material the material being a polymer solution or dispersion
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- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
- D01D5/00—Formation of filaments, threads, or the like
- D01D5/0007—Electro-spinning
- D01D5/0061—Electro-spinning characterised by the electro-spinning apparatus
- D01D5/0076—Electro-spinning characterised by the electro-spinning apparatus characterised by the collecting device, e.g. drum, wheel, endless belt, plate or grid
- D01D5/0084—Coating by electro-spinning, i.e. the electro-spun fibres are not removed from the collecting device but remain integral with it, e.g. coating of prostheses
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- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
- D01F1/00—General methods for the manufacture of artificial filaments or the like
- D01F1/02—Addition of substances to the spinning solution or to the melt
- D01F1/10—Other agents for modifying properties
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- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
- D01F8/00—Conjugated, i.e. bi- or multicomponent, artificial filaments or the like; Manufacture thereof
- D01F8/04—Conjugated, i.e. bi- or multicomponent, artificial filaments or the like; Manufacture thereof from synthetic polymers
- D01F8/10—Conjugated, i.e. bi- or multicomponent, artificial filaments or the like; Manufacture thereof from synthetic polymers with at least one other macromolecular compound obtained by reactions only involving carbon-to-carbon unsaturated bonds as constituent
-
- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
- D01F8/00—Conjugated, i.e. bi- or multicomponent, artificial filaments or the like; Manufacture thereof
- D01F8/04—Conjugated, i.e. bi- or multicomponent, artificial filaments or the like; Manufacture thereof from synthetic polymers
- D01F8/14—Conjugated, i.e. bi- or multicomponent, artificial filaments or the like; Manufacture thereof from synthetic polymers with at least one polyester as constituent
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- 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
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- Engineering & Computer Science (AREA)
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- Chemical Kinetics & Catalysis (AREA)
- Wood Science & Technology (AREA)
- Life Sciences & Earth Sciences (AREA)
- Materials Engineering (AREA)
- General Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
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- Dispersion Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Inorganic Chemistry (AREA)
- Application Of Or Painting With Fluid Materials (AREA)
Abstract
The invention discloses a preparation method of a water-based paint coating. The film-forming component is prepared into aqueous slurry, the aqueous slurry is ground into slurry with high fineness requirement by a low-temperature wet grinding process, and the curing component and the functional filler can be well dispersed; by means of the mechanism of electrostatic spinning, the slurry is sprayed to a metal substrate to form filaments through strong electric field force, comprehensive and uniform fiber covering is formed on the metal substrate through control of the moving speed of the substrate in the horizontal direction, and then a thin powder coating is obtained through curing treatment, and the hardness index is also ideal. No organic solvent is involved in the process, and the preparation method is very environment-friendly.
Description
Technical Field
The invention belongs to the technical field of composite materials, and particularly relates to a preparation method of a water-based paint coating.
Background
Along with the development of society and the improvement of living standard of people, a series of environmental problems such as environmental pollution, greenhouse effect and the like are more prominent year by year, human beings further realize the urgency and importance of environmental protection, and energy conservation and environmental protection become two major subjects which are paid more attention to the economic development of countries in the world at present. Various countries devote themselves to the development of energy-saving products and strict environmental regulations. As a representative of environment-friendly coatings, powder coatings have derived different types of products in order to meet market demands in various application fields, and the applications of the powder coatings in the automobile field are also expanding, and the powder coatings are widely applied to the coating of engine hoods and automobile body parts in recent years, but the powder coatings are not applied to the coating of automobile exterior parts with high appearance requirements in a large amount due to the thicker coatings. In order to save cost and improve the quality of the coating film, the coating process needs to be improved, and the particle size of the coating is reduced so as to improve the thickness and the flatness of the coating film.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide a preparation method of a water-based paint coating.
The purpose of the invention is realized by the following scheme: a preparation method of a water paint coating comprises the steps of preparing a film forming component into water slurry, grinding the water slurry into slurry with high fineness requirement by a low-temperature wet grinding process, wherein a dispersion curing component and a functional filler can be well obtained; by means of an electrostatic spinning mechanism, slurry is sprayed to a metal substrate to form filaments through strong electric field force, comprehensive and uniform fiber covering is formed on a metal substrate through control of the moving speed of the substrate in the horizontal direction, and then a thin powder coating is obtained through curing treatment, and the method comprises the following steps:
(1) pulping: mixing resin powder, nano silicon dioxide, polyvinyl alcohol powder and deionized water according to a mass ratio of 100 (1-5): 20-90): 400-900, wherein the resin powder is a mixture of polyester and a curing agent, the initial particle size of each material is less than 150 meshes, pre-mixing the materials, then filling the materials into wet grinding equipment, grinding media are zirconium oxide microspheres, the grinding speed is 1700-2000 rpm, the temperature of the materials during grinding is controlled below 3 ℃, and when the particle size D of particles in the materials is90Discharging when the particle size is less than or equal to 0.5 mu m to obtain coating slurry;
(2) coating: adding coating slurry into a sizing trough, wherein the addition amount is that the bottom of a rubber roller is immersed into the slurry by 3-5 mm, simultaneously connecting a peristaltic pump slurry feeding circulation system, connecting the rubber roller with high voltage and rotating at a proper rotating speed for sizing, grounding a metal substrate right above the rubber trough and horizontally moving at a constant speed in a direction vertical to the axis of the rubber roller, enabling the slurry at the upper end of the rubber roller to form jet flow upwards under the action of high-voltage electrostatic field force, uniformly depositing on an upper substrate polar plate to form reticular fiber, and then baking the polar plate for 30-60 minutes at 185-200 ℃ to obtain a leveling cured coating.
The resin powder is a mixture of polyester and a curing agent, the polyester is carboxyl-terminated polyester, and the curing agent is triglycidyl isocyanurate (TGIC).
The polymerization degree of the polyvinyl alcohol powder is 1700-1800, and the alcoholysis degree is 88%.
The diameter of the grinding medium zirconia microspheres used for wet grinding is less than or equal to 0.1 mm.
When coating, a plurality of parallel rubber rollers are simultaneously placed in the sizing trough in the figure 1, the rubber rollers have the same specification, can be simultaneously electrified to rotate for sizing, and the rotating direction can be independently controlled.
The voltage range during coating is 70-100 KV, the distance h from the upper end of the rubber roller to the polar plate ranges from 170-200 mm, the horizontal movement speed v of the polar plate ranges from 0.2-1 m/s, the environmental temperature of a spraying space ranges from 50-60 ℃, and the humidity ranges from 45% to 60%.
The thickness of the coating of the solidified powder obtained by construction is less than or equal to 25 mu m, and the hardness reaches 2H.
The resin powder, the nano silicon dioxide, the polyvinyl alcohol powder and other film-forming components are prepared into aqueous slurry, the aqueous slurry is ground into slurry with high fineness requirement through a low-temperature wet grinding process, and meanwhile, the curing component and the functional filler can be well dispersed. By means of the mechanism of electrostatic spinning, the slurry is sprayed to a metal substrate to form filaments through strong electric field force, comprehensive and uniform fiber covering is formed on the metal substrate through control of the moving speed of the substrate in the horizontal direction, and then a thin powder coating is obtained through curing treatment, and the hardness index is also ideal. No organic solvent is involved in the process, and the preparation method is very environment-friendly.
Drawings
FIG. 1: the invention has a simple process flow diagram of electrostatic spinning process equipment;
FIG. 2: is a schematic side view of fig. 1;
FIG. 3: example 1 photograph of fiber layer observed by electronic scanning mirror during electrostatic filamentation;
the reference numbers in the figures illustrate:
1-glue groove;
2-slurry supplement groove; 21. 22-peristaltic pumps one, two;
3-spiral rubber roller; 4-metal substrate.
Detailed Description
The present invention is described in detail by the following specific examples, but the scope of the present invention is not limited to these examples.
Example 1:
a water paint coating, film-forming component prepares into aqueous slurry, through the low-temperature wet grinding process, disperse and solidify component and functional filler; by means of electrostatic spinning, slurry is sprayed to a metal substrate to form filaments through strong electric field force, comprehensive and uniform fiber covering is formed on a metal substrate through control of the moving speed of the substrate in the horizontal direction, and then a thin powder coating is obtained through curing treatment, and the preparation method comprises the following steps:
(1) pulping: taking 100g of polyester and TGIC powder, 1g of nano silicon dioxide, 20g of polyvinyl alcohol powder and 400g of deionized water, wherein the initial particle size of each material is less than 150 meshes, premixing, and then pouring into wet grinding equipment, wherein the grinding medium is zirconia microspheres, the grinding speed is 1700rpm, the temperature of the material during grinding is controlled below 3 ℃, and when the particle size D of particles in the material is smaller than90Discharging when the particle size is less than or equal to 0.1 mu m to obtain coating slurry;
(2) coating: an electrostatic spinning device is adopted as shown in figures 1 and 2, coating slurry is added into a sizing material groove 1, the adding amount is that the bottom of a rubber roller is immersed into the slurry by 3-5 mm, meanwhile, a material supplementing circulation system comprising a peristaltic pump I, a peristaltic pump II, a peristaltic pump I, a peristaltic pump II and a slurry material supplementing groove 2 is connected, the rubber roller of the embodiment adopts a spiral rubber roller 3 to replace a state that a plurality of rubber rollers are connected in parallel, the spiral rubber roller 3 is connected with 70KV high voltage and rotates at a proper rotating speed for gluing, a metal substrate 4 right above the sizing material groove 1 is grounded and moves horizontally at a constant speed in a direction vertical to the axis of the rubber roller, the slurry at the upper end of the rubber roller upwards forms jet flow under the action of high-voltage electrostatic field force, the slurry is uniformly deposited on a substrate pole plate above to form reticular fiber, the moving speed of the metal substrate 4 is 1m/s, the height h =170mm of the upper thread, the environmental temperature of a spraying space is 60 ℃, and the humidity is 45%; the metal substrate 4 was then baked at 185 ℃ for 30 minutes to obtain a flat cured coating, the image of which, viewed with an electronic scanning mirror, is the same as that shown in FIG. 3 for the fibre layer during electrostatic filamentation. The coating test results are shown in table 1.
Example 2:
a water-borne paint coating, similar to example 1, prepared by the following steps:
(1) pulping: taking 100g of polyester and TGIC powder, 5g of nano silicon dioxide, 90g of polyvinyl alcohol powder and 900g of deionized water as auxiliary materials, premixing, and then pouring into wet grinding equipment, wherein a grinding medium is zirconia microspheres, the grinding speed is 2000rpm, the temperature of the material during grinding is controlled below 3 ℃, and discharging when the particle size D90=0.5 μm in the material to obtain coating slurry;
(2) coating: the electrostatic spinning equipment is the same as that of the embodiment 1, coating slurry is added into a glue trough 1, a peristaltic pump slurry feeding circulation system is connected at the same time, a spiral glue roller 3 is connected with 100KV high voltage and rotates to apply glue at a proper rotating speed, a metal substrate 4 right above the glue trough 1 is grounded and moves horizontally at a constant speed in a direction vertical to the axis of the glue roller, the moving speed is 0.2m/s, the height h =200mm of the fed silk, the environment temperature of a spraying space is 55 ℃, and the humidity is 50%; the sizing agent at the upper end of the spiral rubber roller 3 forms jet flow upwards under the action of high-voltage electrostatic field force, evenly deposits on the upper substrate pole plate to form reticular fibers, and then the pole plate is baked for 60 minutes at 190 ℃ to obtain a cured coating, and the test result is shown in table 1.
Example 3:
a water-borne paint coating, similar to example 1, prepared by the following steps:
(1) pulping: taking 100g of polyester and TGIC powder, 2g of nano silicon dioxide, 50g of polyvinyl alcohol powder and 600g of deionized water as auxiliary materials, premixing, and then pouring into wet grinding equipment, wherein a grinding medium is zirconia microspheres, the grinding speed is 1800rpm, the temperature of the material during grinding is controlled below 3 ℃, and discharging when the particle size D90=0.3 μm in the material to obtain coating slurry;
(2) coating: the electrostatic spinning equipment was the same as in example 1, the coating slurry was added to the sizing tank and simultaneously the peristaltic pump slurry feed circulation system was switched on. The rubber roller is connected with 80KV high voltage and rotates at a proper rotating speed for gluing, the metal substrate right above the trough is grounded and moves horizontally at a constant speed in a direction perpendicular to the axis of the rubber roller, the moving speed is 0.4m/s, the thread feeding height h =180mm, the environmental temperature of a spraying space is 60 ℃, and the humidity is 45%. The sizing agent at the upper end of the rubber roller forms jet flow upwards under the action of high-voltage electrostatic field force, the jet flow is uniformly deposited on the upper substrate pole plate to form reticular fibers, then the pole plate is baked for 40 minutes at 185 ℃ to obtain a cured coating, and the test result is shown in table 1.
Example 4:
a water-borne paint coating, similar to example 1, prepared by the following steps:
(1) pulping: taking 100g of polyester and TGIC powder, 4g of nano silicon dioxide, 70g of polyvinyl alcohol powder and 800g of deionized water, premixing, and then pouring into wet grinding equipment, wherein a grinding medium is zirconia microspheres, the grinding speed is 1900rpm, the temperature of the material during grinding is controlled below 3 ℃, and when the particle size D90=0.4 μm in the material, discharging to obtain coating slurry;
(2) coating: the electrostatic spinning equipment was the same as in example 1, the coating slurry was added to the sizing tank and simultaneously the peristaltic pump slurry feed circulation system was switched on. The rubber roller is connected with 90KV high voltage and rotates at a proper rotating speed for gluing, the metal substrate right above the trough is grounded and moves horizontally at a constant speed in a direction perpendicular to the axis of the rubber roller, the moving speed is 0.6m/s, the thread feeding height h =190mm, the environmental temperature of the spraying space is 50 ℃, and the humidity is 60%. The slurry on the upper end of the rubber roller forms a jet upwards under the action of high-voltage electrostatic field force, is uniformly deposited on the upper substrate pole plate to form reticular fibers, and then the pole plate is baked for 50 minutes at 195 ℃ to obtain a cured coating, and table 1 shows the test results of the coating samples obtained in examples 1-4:
Claims (7)
1. a preparation method of a water-based paint coating is characterized in that a film-forming component is prepared into water-based slurry, and a curing component and a functional filler are dispersed through a low-temperature wet grinding process; with the help of electrostatic spinning, thick liquids pass through the strong electric field power to the metal substrate sprays filamentation, through the control of horizontal direction to the base plate translation speed, forms comprehensive even fibre to the metal substrate and covers, again through solidification processing, obtains very thin solidification powder coating, includes the following step:
(1) pulping: mixing resin powder, nano silicon dioxide, polyvinyl alcohol powder and deionized water according to a mass ratio of 100 (1-5): 20-90): 400-900, wherein the resin powder is a mixture of polyester and a curing agent, the initial particle size of each material is less than 150 meshes, pre-mixing the materials, then filling the materials into wet grinding equipment, grinding media are zirconium oxide microspheres, the grinding speed is 1700-2000 rpm, the temperature of the materials during grinding is controlled below 3 ℃, and when the particle size D of particles in the materials is90Discharging when the particle size is less than or equal to 0.5 mu m to obtain coating slurry;
(2) coating: adding coating slurry into a sizing trough, wherein the addition amount is that the bottom of a rubber roller is immersed into the slurry by 3-5 mm, simultaneously connecting a peristaltic pump slurry feeding circulation system, connecting the rubber roller with high voltage and rotating at a proper rotating speed for sizing, grounding a metal substrate right above the rubber trough and horizontally moving at a constant speed in a direction vertical to the axis of the rubber roller, enabling the slurry at the upper end of the rubber roller to form jet flow upwards under the action of high-voltage electrostatic field force, uniformly depositing on an upper substrate polar plate to form reticular fiber, and then baking the polar plate for 30-60 minutes at 185-200 ℃ to obtain the leveling cured powder coating.
2. The method of claim 1, wherein in the step (1), the resin powder is a mixture of carboxyl-terminated polyester and curing agent triglycidyl isocyanurate (TGIC).
3. The method for preparing a water-based paint coating according to claim 1, wherein in the step (1), the polymerization degree of the polyvinyl alcohol powder is 1700-1800, and the alcoholysis degree is 88%.
4. The method for preparing the water-based paint coating of claim 1, wherein in the step (1), the diameter of the grinding medium zirconia microspheres used for wet grinding is less than or equal to 0.1 mm.
5. The method for preparing the water-based paint coating according to claim 1, wherein in the step (2), a plurality of rubber rollers which are parallel to each other are simultaneously placed in a sizing trough during coating, the rubber rollers have the same specification, can be simultaneously electrified for rotary sizing, and the rotating direction can be independently controlled.
6. The preparation method of the water-based paint coating as claimed in claim 1, wherein the voltage range during coating is 70-100 KV, the distance h between the upper end of the rubber roll and the polar plate is 170-200 mm, the horizontal movement velocity v of the polar plate is 0.2-1 m/s, the environmental temperature of the spraying space is 50-60 ℃, and the humidity is 45-60%.
7. The preparation method of the water-based paint coating according to claim 1, characterized in that the thickness of the coating of the solidified powder obtained by construction is less than or equal to 25 μm, and the hardness reaches 2H.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106987184A (en) * | 2017-05-18 | 2017-07-28 | 聂超 | It is a kind of it is freeze proof split, waterproof, weather resistant building coating and preparation method thereof |
| CN107541135A (en) * | 2017-07-31 | 2018-01-05 | 上海纳米技术及应用国家工程研究中心有限公司 | A kind of preparation method of powdery paints coating and products thereof and application |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106987184A (en) * | 2017-05-18 | 2017-07-28 | 聂超 | It is a kind of it is freeze proof split, waterproof, weather resistant building coating and preparation method thereof |
| CN107541135A (en) * | 2017-07-31 | 2018-01-05 | 上海纳米技术及应用国家工程研究中心有限公司 | A kind of preparation method of powdery paints coating and products thereof and application |
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