CN108690476B - Acrylate coating and preparation method thereof - Google Patents
Acrylate coating and preparation method thereof Download PDFInfo
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- CN108690476B CN108690476B CN201710136193.7A CN201710136193A CN108690476B CN 108690476 B CN108690476 B CN 108690476B CN 201710136193 A CN201710136193 A CN 201710136193A CN 108690476 B CN108690476 B CN 108690476B
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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
- C09D175/00—Coating compositions based on polyureas or polyurethanes; Coating compositions based on derivatives of such polymers
- C09D175/04—Polyurethanes
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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
- C08G73/00—Macromolecular compounds obtained by reactions forming a linkage containing nitrogen with or without oxygen or carbon in the main chain of the macromolecule, not provided for in groups C08G12/00 - C08G71/00
- C08G73/02—Polyamines
- C08G73/026—Wholly aromatic polyamines
- C08G73/0266—Polyanilines or derivatives thereof
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
- C08L2205/035—Polymer mixtures characterised by other features containing three or more polymers in a blend containing four or more polymers in a blend
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/14—Polymer mixtures characterised by other features containing polymeric additives characterised by shape
- C08L2205/16—Fibres; Fibrils
Abstract
The invention relates to an acrylate coating, which comprises the following components in parts by weight: 20-30 parts of acrylic resin; 23-30 parts of an isocyanate compound; 20-40 parts of a solvent; 5-10 parts of a catalyst; 8-10 parts of a leveling agent; 2-6 parts of a dispersing agent; 10-12 parts of a reinforcing agent; the reinforcing agent comprises polyaniline nanofibers. The reinforcing material is added into the acrylate coating, so that the bonding performance of the acrylate coating is enhanced, the strength of the coating is enhanced, and the coating effect of the acrylate coating is improved.
Description
Technical Field
The invention relates to the field of coatings, in particular to an acrylate coating and a preparation method thereof.
Background
Acrylate coating is a common coating with wider industrial application, and polyacrylate resin is prepared by taking acrylate as a basic monomer through addition polymerization. If the acrylate coating only contains a single acrylate, the performance of the acrylate coating in terms of elasticity and strength is poor, and the adaptability is limited.
Curing crosslinking agents are usually added to acrylate coatings to further improve the properties of the acrylate coatings in terms of elasticity, strength and weatherability. Because of high weather resistance and good adhesion performance, the coating can be used in non-long-term water immersion environments such as roofs, wall surfaces and the like. If acrylic resin coats under comparatively moist environment, there is a layer of thin water film between coating and the face of treating coating, can influence the coating effect of acrylic ester coating, and the later stage appears the tympanic bulla easily, the crack leads to the coating to drop, influences the use.
Disclosure of Invention
The invention aims to provide an acrylate coating and a preparation method thereof.
The above object of the present invention is achieved by the following technical solutions: an acrylate coating comprises the following components in parts by weight:
the reinforcing agent comprises polyaniline nanofibers.
By adopting the technical scheme, the acrylic resin is used as a coating main agent, the isocyanate compound is added into the acrylic resin to react and solidify with the acrylic resin, the catalyst further catalyzes the hydroxyl in the acrylic resin to react with the isocyanate group in the isocyanate compound, and the leveling agent and the dispersing agent can promote the solvent in the coating to disperse more uniformly and the surface to be smoother. In addition, in order to enhance the strength of the prepared coating, polyaniline nanofibers were added to the coating as a reinforcing agent. Meanwhile, secondary amine in polyaniline also plays a role in promoting the reaction of isocyanate groups and hydroxyl groups.
Preferably, the isocyanate compound is one of Hexamethylene Diisocyanate (HDI) biuret or HDI trimer.
Further, the solvent is one of ethyl acetate, butyl acetate or propylene glycol methyl ether acetate.
By adopting the technical scheme, Hexamethylene Diisocyanate (HDI) biuret and HDI tripolymer are aliphatic isocyanate compounds, and are easy to dissolve in solvents such as ethyl acetate, butyl acetate or propylene glycol monomethyl ether acetate.
Preferably, the catalyst is one of diazabicyclo [2.2.2] octane or dibutyltin dilaurate.
By adopting the technical scheme, diazabicyclo [2.2.2] octane and dibutyltin dilaurate are used as catalysts to promote the reaction of acrylic resin and isocyanate compound and promote curing.
Preferably, the leveling agent is an organopolysiloxane.
By adopting the technical scheme, the organic polysiloxane is used as the leveling agent, so that the adhesion of the coating and the surface of the base material can be promoted, the surface tension of the coating can be reduced, and the leveling property and uniformity of the surface of the coating can be improved.
Preferably, the dispersant is polyvinyl alcohol.
By adopting the technical scheme, the polyvinyl alcohol is used as the dispersing agent, the proportion of hydroxyl groups and isocyanate groups in the coating can be adjusted, the gloss of the coating can be improved, and the stability of the coating can be maintained.
Preferably, the acrylate coating comprises the following components in parts by weight:
through multiple tests, the adhesive property between the acrylate coating prepared by the above proportion and a base material and the strength of the coating are greatly improved.
Further, a method for preparing the acrylate coating of any one of claims 1-7, comprising the steps of:
step 1: preparing polyaniline nano-fibers: dissolving 5 parts of aniline monomer and 25 parts of ammonium persulfate in 400 parts of 50% acetic acid to obtain a premix; carrying out ultrasonic treatment on the premix at 20 ℃ for 30min, and standing for 3h to obtain polyaniline nanofiber dispersion liquid; filtering and washing the polyaniline nanofiber dispersion solution, and freeze-drying to obtain polyaniline nanofibers;
step 2: putting the polyaniline nano-fiber prepared in the step 1 and acrylic resin in a solvent, and stirring for 20min to obtain a mixture, wherein the temperature is 20-25 ℃;
and step 3: adding a leveling agent and a dispersing agent into the mixture prepared in the step 2, and stirring for 20min to obtain an emulsified mixture;
and 4, step 4: and (3) adding an isocyanate compound and a catalyst into the emulsified mixture prepared in the step (3), and stirring for 10min to obtain the acrylate coating.
By adopting the technical scheme, the polyaniline nano-fiber exists in a fiber form, and the polyaniline nano-fiber is prepared by using a freeze-drying method. And then, placing the polyaniline nano-fiber and the acrylic resin in a solvent and stirring to uniformly disperse the polyaniline nano-fiber in the solvent. In addition, a leveling agent and a dispersing agent are further added into the mixture to prepare a relatively uniform emulsified mixture, and finally, an isocyanate compound and a catalyst are added for curing and crosslinking. The surface of the polyaniline nano-fiber contains secondary amine groups, so that the curing effect can be promoted, in addition, the fibrous polyaniline nano-fiber and other components have physical crosslinking effect, and on the other hand, the strength of the coating can be macroscopically enhanced.
In conclusion, the invention has the following beneficial effects:
1. the polyaniline nano-fiber is used as a reinforcing agent, the functional groups on the surface of the polyaniline nano-fiber can be combined with other components in the coating by Van der Waals force, and meanwhile, the polyaniline nano-fiber can also be combined with other components in the coating in a macroscopic view, so that the overall strength of the coating is enhanced. In addition, the polyaniline nanofibers also function as a dispersant.
2. The polyaniline nano-fiber is prepared by a freeze-drying method, and the polyaniline nano-fiber prepared by the method has better strength.
3. Besides leveling agent can make the surface of the coating smoother, the flatting agent can also enhance the bonding strength of the coating and the substrate.
Drawings
FIG. 1 is a process flow diagram for preparing acrylate waterproof coating.
Detailed Description
All the components used in the invention are commercially available except that the polyaniline nanofibers are prepared by themselves. The present invention will be described in further detail with reference to fig. 1.
The first embodiment is as follows:
the specific process for preparing the acrylate waterproof coating comprises the following steps:
step 1: preparing polyaniline nano-fibers: 5kg of aniline monomer and 25kg of ammonium persulfate are dissolved in 400kg of 50% acetic acid to obtain a premix; carrying out ultrasonic treatment on the premix at 20 ℃ for 30min, and standing for 3h to obtain polyaniline nanofiber dispersion liquid; filtering and washing the polyaniline nanofiber dispersion solution, and freeze-drying to obtain polyaniline nanofibers;
step 2: weighing 12kg of polyaniline nano-fiber prepared in the step 1 and 20kg of acrylic resin, and placing the polyaniline nano-fiber and the acrylic resin in 30kg of ethyl acetate to stir for 20min to obtain a mixture, wherein the temperature is 20-25 ℃;
and step 3: adding 9kg of organopolysiloxane and 4kg of polyvinyl alcohol into the mixture prepared in the step 2, and stirring for 20min to obtain an emulsified mixture;
and 4, step 4: and (3) adding 25kg of Hexamethylene Diisocyanate (HDI) biuret and 7kg of diazabicyclo [2.2.2] octane into the emulsified mixture prepared in the step (3), and stirring for 10min to obtain the acrylate coating.
Other examples are different from the first example in the components and the mixture ratio thereof, and the components of each example are shown in table 2.
Table 2 components and proportions in the examples
Preparing the acrylate coating according to the above mixture ratio, and carrying out performance test on the acrylate coating. The test basis is as follows: GB/T9286-1998 cut and check test of gas film of color paint and varnish; and (3) hardness testing: GB/T6739-2006 pencil method for measuring coating hardness; heat resistance: testing according to GB/T1735; impact resistance as tested according to GB/T1732-1993; tensile strength and elongation at break were tested according to GB/T1040-92.
The acrylate coatings prepared in the above examples were tested according to the above standards, and the specific test results are shown in table 2.
TABLE 2 test results of the examples
From the results of table 2, it can be seen that the acrylate coatings prepared by the above examples all have relatively strong adhesion and relatively good heat resistance. In the aspect of mechanical property, the impact resistance of the coating can reach 80cm at most, the tensile strength can reach 4.1MPa at most, and the elongation at break can reach 367 at most. The polyaniline nanofiber is added into the coating, the polyaniline nanofiber is in lap joint with other sheet layer components to form a three-dimensional network structure, the polyaniline nanofiber is similar to a lap joint framework, and the tensile strength, the impact resistance and the elongation at break of the coating are improved. Besides being used as a leveling agent, the organopolysiloxane can also enhance the bonding effect between the coating and the base material and enhance the adhesive force.
Comparative example:
the following comparative examples are different in composition from example one, and the components of the comparative examples are shown in table 3.
TABLE 3 Components and proportions in proportions for each pair
The above comparative examples were tested according to the methods of the examples, and the test results are shown in Table 4.
Table 4 comparative test results
The reinforcing agent of the comparative example I is polyaniline solution, the reinforcing agent of the comparative example II is not added, the leveling agent of the comparative example III is not added, the dispersing agent of the comparative example IV is not added, and the commercially available polyaniline is used as the reinforcing agent of the comparative example V. From the data in Table 4, it is understood that if no reinforcing agent is added to the coating material, the impact resistance of the coating material is greatly reduced, and the tensile strength and elongation at break are also greatly reduced, and it is seen that polyaniline nanofibers as reinforcing agents can improve the impact resistance of the coating material. If the polyaniline nanofibers in the coating are replaced with polyaniline solution, the polyaniline exists in the solution in the form of a film, and the reinforcing agent is overlapped with other components in the coating in the form of sheets, so that the strength is reduced. The coating of the third comparative example, in which no leveling agent was added, had a decreased bonding ability with the substrate. No dispersant is added in the coating, so that the components in the coating can be unevenly dispersed, and the tensile strength of the coating is poor.
The present embodiment is only for explaining the present invention, and it is not limited to the present invention, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present invention.
Claims (8)
1. An acrylate coating characterized by: the composition comprises the following components in parts by weight:
20-30 parts of acrylic resin;
23-30 parts of an isocyanate compound;
20-40 parts of a solvent;
5-10 parts of a catalyst;
8-10 parts of a leveling agent;
2-6 parts of a dispersing agent;
10-12 parts of a reinforcing agent;
the reinforcing agent comprises polyaniline nanofibers;
preparing the polyaniline nano-fiber: dissolving 5 parts of aniline monomer and 25 parts of ammonium persulfate in 400 parts of 50% acetic acid to obtain a premix; carrying out ultrasonic treatment on the premix at 20 ℃ for 30min, and standing for 3h to obtain polyaniline nanofiber dispersion liquid; and filtering and washing the polyaniline nanofiber dispersion solution, and freeze-drying to obtain the polyaniline nanofiber.
2. The acrylate coating according to claim 1, characterized in that: the isocyanate compound is one of Hexamethylene Diisocyanate (HDI) biuret or HDI trimer.
3. The acrylate coating according to claim 1, characterized in that: the solvent is one of ethyl acetate, butyl acetate or propylene glycol methyl ether acetate.
4. The acrylate coating according to claim 1, characterized in that: the catalyst is one of diazabicyclo [2.2.2] octane or dibutyltin dilaurate.
5. The acrylate coating according to claim 1, characterized in that: the leveling agent is organic polysiloxane.
6. The acrylate coating according to claim 1, characterized in that: the dispersant is polyvinyl alcohol.
7. The acrylate coating according to claim 1, characterized in that: the composition comprises the following components in parts by weight:
20 parts of acrylic resin;
25 parts of an isocyanate compound;
30 parts of a solvent;
7 parts of a catalyst;
9 parts of a leveling agent;
4 parts of a dispersing agent;
and 12 parts of a reinforcing agent.
8. A method of preparing the acrylate coating of any of claims 1-7, characterized in that: the method comprises the following steps:
step 1: preparing polyaniline nano-fibers: dissolving 5 parts of aniline monomer and 25 parts of ammonium persulfate in 400 parts of 50% acetic acid to obtain a premix; carrying out ultrasonic treatment on the premix at 20 ℃ for 30min, and standing for 3h to obtain polyaniline nanofiber dispersion liquid; filtering and washing the polyaniline nanofiber dispersion solution, and freeze-drying to obtain polyaniline nanofibers;
step 2: putting the polyaniline nano-fiber prepared in the step 1 and acrylic resin in a solvent, and stirring for 20min to obtain a mixture, wherein the temperature is 20-25 ℃;
and step 3: adding a leveling agent and a dispersing agent into the mixture prepared in the step 2, and stirring for 20min to obtain an emulsified mixture;
and 4, step 4: and (3) adding an isocyanate compound and a catalyst into the emulsified mixture prepared in the step (3), and stirring for 10min to obtain the acrylate coating.
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| CN112745707A (en) * | 2020-12-29 | 2021-05-04 | 石家庄磊盛科技有限公司 | Environment-friendly coating and preparation method and application thereof |
| CN114958101A (en) * | 2022-05-09 | 2022-08-30 | 南通欣然粉末涂料有限公司 | Polyaniline-reinforced high-hydrophobicity coating and preparation process thereof |
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| WO2012162356A2 (en) * | 2011-05-23 | 2012-11-29 | E. I. Du Pont De Nemours And Company | Anti-corrosion coating composition and use thereof |
| CN103145982B (en) * | 2013-03-25 | 2015-04-08 | 北京科技大学 | Controllable synthesis method of level structure of polyaniline |
| CN105720272B (en) * | 2016-02-24 | 2018-08-24 | 哈尔滨工业大学（威海） | A kind of air electrode nitrogen phosphorus codope porous carbon nanofiber material preparation method |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1935911A (en) * | 2006-10-24 | 2007-03-28 | 查培法 | Bottom-surface-in-one fluorocarbon enamelled paint and its preparing method |
| CN101693810A (en) * | 2009-10-30 | 2010-04-14 | 株洲市九华新材料涂装实业有限公司 | Locomotive header skid-resistant coating material and preparation method of same |
| CN102010652A (en) * | 2010-10-28 | 2011-04-13 | 华南理工大学 | Two-component polyurethane coating used for automobile and preparation method thereof |
| CN104610864A (en) * | 2015-01-13 | 2015-05-13 | 航天材料及工艺研究所 | Preparation method of insulating high-thermal radiation coating suitable for various base materials |
| CN104927515A (en) * | 2015-05-27 | 2015-09-23 | 芜湖县双宝建材有限公司 | Waterproof high-adhesive-force corrosion-resistant coating for ships |
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