CN112126317A - Low-temperature-resistant novel water-based epoxy coating and preparation method thereof - Google Patents
Low-temperature-resistant novel water-based epoxy coating and preparation method thereof Download PDFInfo
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- CN112126317A CN112126317A CN202011043281.0A CN202011043281A CN112126317A CN 112126317 A CN112126317 A CN 112126317A CN 202011043281 A CN202011043281 A CN 202011043281A CN 112126317 A CN112126317 A CN 112126317A
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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
- C09D163/00—Coating compositions based on epoxy resins; Coating compositions based on derivatives of epoxy resins
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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
- C08G59/00—Polycondensates containing more than one epoxy group per molecule; Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups
- C08G59/18—Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups ; e.g. general methods of curing
- C08G59/40—Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups ; e.g. general methods of curing characterised by the curing agents used
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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
- C09D7/45—Anti-settling agents
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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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- 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
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/24—Acids; Salts thereof
- C08K3/26—Carbonates; Bicarbonates
- C08K2003/265—Calcium, strontium or barium carbonate
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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
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/32—Phosphorus-containing compounds
- C08K2003/321—Phosphates
- C08K2003/328—Phosphates of heavy metals
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- Life Sciences & Earth Sciences (AREA)
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- Chemical Kinetics & Catalysis (AREA)
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Abstract
The invention provides a novel low-temperature-resistant water-based epoxy coating and a preparation method thereof, wherein the coating comprises water-based epoxy resin, a curing agent, a defoaming agent, a base material wetting agent, a film-forming assistant, an anti-settling assistant, a filler, silica sol, konjac flour and water; the preparation method comprises the following steps: adding water into a stirrer, and then adding a base material wetting agent, an anti-settling auxiliary agent, a filler and a film-forming auxiliary agent into the stirrer to obtain a solution I; adding 2/3 of the total mass of the defoaming agent and the konjac flour into the solution I, uniformly stirring, then reducing the stirring speed to 500-600r/min, adding silica sol and a curing agent into the solution I, and stirring to obtain a solution II; and adding the aqueous epoxy resin into the solution II, adding the rest konjac flour into the solution II, and stirring to obtain a finished product. The raw materials of the coating are matched with the preparation method for use, the performance of the coating can be further improved, and the obtained coating has the advantages of high adhesive force, good film forming property and high pencil hardness at the temperature higher than-5 ℃.
Description
Technical Field
The invention relates to the technical field of water-based industrial coatings, in particular to a novel low-temperature-resistant water-based epoxy coating and a preparation method thereof.
Background
The paint is coated on the surfaces of machinery, walls and the like, and has the functions of enhancing aesthetic feeling, preventing corrosion and the like. The demand for coatings has increased with the development of machines, which have been used in different environments and have different requirements, and therefore coatings of various compositions have come into the spotlight.
Along with the enhancement of environmental protection consciousness of people, the market of the water-based paint is more and more extensive, and the water-based paint takes water as a medium to dilute and mix the raw material composition, so that the paint forms a product with certain concentration and certain consistency and is convenient to use; however, the aqueous paint has a big disadvantage that the performance of the aqueous paint is poor at low temperature, such as the paint is easy to peel off at low temperature, and the film forming performance is poor during the coating process, and the film is not easy to form, thereby affecting the low-temperature use of the aqueous paint.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a novel low-temperature-resistant water-based epoxy coating and a preparation method thereof, and the novel low-temperature-resistant water-based epoxy coating can form a film uniformly at the temperature higher than-5 ℃, the surface of the formed film is flat, the adhesive force is high, and the pencil hardness is high; the preparation method has the characteristics of strong orderliness and specificity, the performance of the coating can be further improved by matching the raw materials of the coating with the preparation method, and the obtained coating has the advantages of high adhesive force, good film-forming property and high pencil hardness at the temperature higher than-5 ℃.
The technical scheme of the invention is as follows:
a novel low-temperature-resistant water-based epoxy coating comprises the following components in parts by weight:
30-50 parts of water-based epoxy resin, 50-80 parts of curing agent, 0.1-0.3 part of defoaming agent, 0.2-0.6 part of base material wetting agent, 1-4 parts of film-forming additive, 0.5-1.5 parts of anti-settling additive, 10-30 parts of filler, 3-10 parts of silica sol, 3-8 parts of konjac flour and 20-30 parts of water.
Preferably, the novel low-temperature-resistant water-based epoxy coating comprises the following components in parts by weight:
40 parts of waterborne epoxy resin, 65 parts of curing agent, 0.2 part of defoaming agent, 0.4 part of base material wetting agent, 2.5 parts of film-forming additive, 1.3 parts of anti-settling additive, 20 parts of filler, 7.4 parts of silica sol, 4.8 parts of konjac flour and 25 parts of water.
Preferably, the curing agent is HT-808 curing agent and kvd31 curing agent, and the mass ratio of the HT-808 curing agent to the HT-808 curing agent is 2: 3.4-5.5.
Preferably, the anti-settling auxiliary agent is bentonite.
Preferably, the filler consists of zinc phosphate and calcium carbonate, and the mass ratio of the zinc phosphate to the calcium carbonate is 1.7-2.3: 1.
Preferably, in the konjac flour, the content of glucomannan is 78-86%, and the particle size of the konjac flour with the particle size of less than or equal to 0.425mm accounts for more than 90% of the total mass.
The preparation method of the low-temperature-resistant novel water-based epoxy coating comprises the following steps:
(1) adding water into a stirrer, starting stirring at the stirring speed of 800-1200r/min, then adding a base material wetting agent, an anti-settling auxiliary agent, a filler and a film-forming auxiliary agent, and uniformly stirring to obtain a solution I;
(2) adding 2/3 of the total mass of the defoaming agent and the konjac flour into the solution I obtained in the step (1), uniformly stirring at 1500r/min, then reducing the stirring speed to 500-600r/min, adding silica sol and a curing agent into the solution I, and stirring at 1000-1200r/min for 15-25min to obtain a solution II;
(3) adding the aqueous epoxy resin into the solution II in the step (2), stirring for 20-30min under the condition of 400r/min, then adding the rest konjac flour, and stirring for 10-15min under the condition of 700-800r/min to obtain a finished product.
Preferably, in the step (3), after the aqueous epoxy resin is added, 25min is performed at 400r/min, and after the konjac flour is added, 13min is stirred at 780 r/min.
Compared with the prior art, the invention has the beneficial effects that: by using the curing agent and limiting the amount of the curing agent, the curing time of the coating is controlled, and a stable system is formed between the epoxy resin in the coating and the raw materials by matching with the silica sol, the konjac flour and the anti-settling auxiliary agent in the coating, so that the components are relatively stable in the coating process, the uniform performance of a formed film is realized, and the adhesive force and the pencil hardness of the film are improved; in addition, the paint has low-temperature resistance and excellent adhesion under low-temperature conditions by matching with the preparation method of the invention.
Detailed Description
In order to make those skilled in the art better understand the technical solutions in the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to 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.
Example 1
A novel low-temperature-resistant water-based epoxy coating comprises the following components in parts by weight:
40kg of water-based epoxy resin, 65kg of curing agent, 0.2kg of defoaming agent, 0.4kg of base material wetting agent, 2.5kg of film-forming additive, 1.3kg of bentonite, 20kg of filler, 7.4kg of silica sol, 4.8kg of konjac flour and 25kg of water.
The curing agent consists of HT-808 curing agent (22.41kg) and kvd31 curing agent (42.59 kg); the filler consisted of zinc phosphate (13.71kg) and calcium carbonate (6.29 kg); in the konjac flour, the content of glucomannan is 83 percent, and the particle size of the konjac flour with the particle size less than or equal to 0.425mm accounts for 95 percent of the total mass.
The preparation method of the low-temperature-resistant novel water-based epoxy coating comprises the following steps:
(1) adding water into a stirrer, starting stirring at the stirring speed of 1000r/min, then adding a base material wetting agent, an anti-settling auxiliary agent, a filler and a film-forming auxiliary agent, and uniformly stirring to obtain a solution I;
(2) adding 3.2kg of defoaming agent and konjac flour into the solution I obtained in the step (1), stirring uniformly under the condition of 1500r/min, then reducing the stirring speed to 500r/min, adding silica sol and curing agent into the solution I, and stirring for 15-25min under the condition of 1000r/min to obtain a solution II;
(3) and (3) adding the aqueous epoxy resin into the solution II in the step (2), stirring for 25min under the condition of 400r/min, then adding 1.6kg of the rest konjac flour into the solution, and stirring for 13min under the condition of 780r/min to obtain a finished product.
Example 2
A novel low-temperature-resistant water-based epoxy coating comprises the following components in parts by weight:
30kg of water-based epoxy resin, 50kg of curing agent, 0.1kg of defoaming agent, 0.2kg of base material wetting agent, 1kg of film-forming additive, 0.5kg of bentonite, 10kg of filler, 3kg of silica sol, 3kg of konjac flour and 20kg of water.
The curing agent consists of HT-808 curing agent (18.52kg) and kvd31 curing agent (31.48 kg); the filler is composed of zinc phosphate (6.30kg) and calcium carbonate (3.70 kg); in the konjac flour, the content of glucomannan is 78 percent, and the granularity of which is less than or equal to 0.425mm accounts for 92 percent of the total mass.
The preparation method of the low-temperature-resistant novel water-based epoxy coating comprises the following steps:
(1) adding water into a stirrer, starting stirring at the stirring speed of 800r/min, then adding a base material wetting agent, an anti-settling auxiliary agent, a filler and a film-forming auxiliary agent, and uniformly stirring to obtain a solution I;
(2) adding 2kg of defoaming agent and konjac flour into the solution I obtained in the step (1), uniformly stirring at 1500r/min, then reducing the stirring speed to 500r/min, adding silica sol and curing agent into the solution, and stirring at 1000r/min for 15min to obtain a solution II;
(3) and (3) adding the aqueous epoxy resin into the solution II in the step (2), stirring for 20min under the condition of 400r/min, then adding 1kg of the rest konjac flour into the solution, and stirring for 10min under the condition of 700r/min to obtain a finished product.
Example 3
A novel low-temperature-resistant water-based epoxy coating comprises the following components in parts by weight:
50kg of water-based epoxy resin, 80kg of curing agent, 0.3kg of defoaming agent, 0.6kg of base material wetting agent, 4kg of film-forming additive, 1.5kg of bentonite, 30kg of filler, 10kg of silica sol, 8kg of konjac flour and 30kg of water.
The curing agent consists of HT-808 curing agent (21.33kg) and kvd31(58.67kg) curing agent; the filler consisted of zinc phosphate (20.91kg) and calcium carbonate (9.09 kg); in the konjac flour, the content of glucomannan is 86 percent, and the particle size of which is less than or equal to 0.425mm accounts for 94 percent of the total mass.
The preparation method of the low-temperature-resistant novel water-based epoxy coating comprises the following steps:
(1) adding water into a stirrer, starting stirring at the stirring speed of 1200r/min, then adding a base material wetting agent, an anti-settling auxiliary agent, a filler and a film-forming auxiliary agent, and uniformly stirring to obtain a solution I;
(2) adding 5.33kg of defoaming agent and konjac flour into the solution I obtained in the step (1), uniformly stirring at 1500r/min, then reducing the stirring speed to 600r/min, adding silica sol and curing agent into the solution I, and stirring at 1200r/min for 25min to obtain a solution II;
(3) and (3) adding the aqueous epoxy resin into the solution II in the step (2), stirring for 30min at the speed of 400r/min, then adding 2.67kg of the rest konjac flour into the solution II, and stirring for 15min at the speed of 800r/min to obtain a finished product.
Comparative example 1
The difference from example 1 is that the curing agent is HT-808 curing agent 65 kg.
Comparative example 2
The difference from example 1 is that the curing agent was kvd31, 65kg of curing agent.
Comparative example 3
The difference from example 1 is that no konjac flour was added, and the amount of bentonite added was 6.1 kg.
Comparative example 4
The difference from example 1 is that the preparation method is as follows:
(1) adding water into a stirrer, starting stirring at the stirring speed of 1000r/min, adding 3.2kg of defoaming agent and konjac flour, uniformly stirring at the speed of 1500r/min, then reducing the stirring speed to 500r/min, adding silica sol and curing agent, and stirring at the speed of 1000r/min for 15-25min to obtain a solution I;
(2) adding a base material wetting agent, an anti-settling auxiliary agent, a filler and a film-forming auxiliary agent into the solution I obtained in the step (1), and uniformly stirring to obtain a solution II;
(3) and (3) adding the aqueous epoxy resin and 1.6kg of the residual konjac flour into the solution II in the step (2), and stirring for 38min under the condition of 400r/min to obtain a finished product.
The coatings of examples 1-3 and comparative examples 1-4 were subjected to performance tests, the results of which are shown in tables 1, 2, 3 and 4, as follows:
TABLE 1 measurement results (-5 ℃ C. Properties)
TABLE 2 measurement results (-3 ℃ C. Properties)
TABLE 3 measurement results (Performance at 0 ℃ C.)
TABLE 4 measurement results (Properties at 5 ℃ C.)
The samples are respectively prepared at-5 ℃, 3 ℃, 0 ℃ and 5 ℃ in the preparation process by adopting a roller coating mode, and the prepared samples are respectively dried at-5 ℃, 3 ℃, 0 ℃ and 5 ℃ for 15 days, 10 days, 5 days and 5 days.
As can be seen from the table, the coating disclosed by the invention has good performance under the conditions of-5 ℃, 3 ℃, 0 ℃ and 5 ℃, the appearance of a paint film is flat, complete and smooth, the adhesive force is more than or equal to grade 4, and the pencil hardness is high, which indicates that a product obtained by using the method disclosed by the invention can be suitable for low-temperature use and has excellent low-temperature performance.
Although the present invention has been described in detail by referring to the preferred embodiments, the present invention is not limited thereto. Various equivalent modifications or substitutions can be made on the embodiments of the present invention by those skilled in the art without departing from the spirit and scope of the present invention, and these modifications or substitutions are within the scope of the present invention/any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (8)
1. The novel low-temperature-resistant water-based epoxy coating is characterized by comprising the following components in parts by weight:
30-50 parts of water-based epoxy resin, 50-80 parts of curing agent, 0.1-0.3 part of defoaming agent, 0.2-0.6 part of base material wetting agent, 1-4 parts of film-forming additive, 0.5-1.5 parts of anti-settling additive, 10-30 parts of filler, 3-10 parts of silica sol, 3-8 parts of konjac flour and 20-30 parts of water.
2. The novel low-temperature-resistant water-based epoxy coating as claimed in claim 1, which comprises the following components in parts by weight:
40 parts of waterborne epoxy resin, 65 parts of curing agent, 0.2 part of defoaming agent, 0.4 part of base material wetting agent, 2.5 parts of film-forming additive, 1.3 parts of anti-settling additive, 20 parts of filler, 7.4 parts of silica sol, 4.8 parts of konjac flour and 25 parts of water.
3. The novel low-temperature-resistant water-based epoxy coating as claimed in claim 1 or 2, wherein the curing agent is HT-808 curing agent and kvd31 curing agent, and the mass ratio of the HT-808 curing agent to the HT-808 curing agent is 2: 3.4-5.5.
4. The novel low temperature-resistant water-based epoxy coating material according to claim 1 or 2, wherein the anti-settling additive is bentonite.
5. A novel low temperature-resistant aqueous epoxy coating composition according to claim 1 or 2, wherein the filler is composed of zinc phosphate and calcium carbonate in a mass ratio of 1.7 to 2.3: 1.
6. The novel low temperature-resistant water-based epoxy paint as claimed in claim 1 or 2, wherein the konjac flour contains 78-86% of glucomannan, and has a particle size of 0.425mm or less of 90% or more of the total mass.
7. The method for preparing the novel low temperature resistant water-based epoxy coating according to any one of claims 1 to 6, characterized in that the process is as follows:
(1) adding water into a stirrer, starting stirring at the stirring speed of 800-1200r/min, then adding a base material wetting agent, an anti-settling auxiliary agent, a filler and a film-forming auxiliary agent, and uniformly stirring to obtain a solution I;
(2) adding 2/3 of the total mass of the defoaming agent and the konjac flour into the solution I obtained in the step (1), uniformly stirring at 1500r/min, then reducing the stirring speed to 500-600r/min, adding silica sol and a curing agent into the solution I, and stirring at 1000-1200r/min for 15-25min to obtain a solution II;
(3) adding the aqueous epoxy resin into the solution II in the step (2), stirring for 20-30min under the condition of 400r/min, then adding the rest konjac flour, and stirring for 10-15min under the condition of 700-800r/min to obtain a finished product.
8. The method of claim 7, wherein in the step (3), the aqueous epoxy resin is added and then stirred at 400r/min for 25min, and the konjac flour is added and then stirred at 780r/min for 13 min.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011043281.0A CN112126317A (en) | 2020-09-28 | 2020-09-28 | Low-temperature-resistant novel water-based epoxy coating and preparation method thereof |
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| CN202011043281.0A CN112126317A (en) | 2020-09-28 | 2020-09-28 | Low-temperature-resistant novel water-based epoxy coating and preparation method thereof |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106634448A (en) * | 2016-12-30 | 2017-05-10 | 上海美东生物材料股份有限公司 | Waterborne epoxy flash-rust preventing paint |
| CN106752689A (en) * | 2016-11-30 | 2017-05-31 | 深圳市创智成功科技有限公司 | Paints Curing under Water and preparation method thereof |
| CN107779040A (en) * | 2016-08-27 | 2018-03-09 | 江苏冠军涂料科技集团股份有限公司 | A kind of anti-corrosion Environmental Protective Water-paint and preparation method thereof |
| CN110078883A (en) * | 2019-05-22 | 2019-08-02 | 西华大学 | A kind of water paint resin, preparation method and composition based on konjaku flour |
-
2020
- 2020-09-28 CN CN202011043281.0A patent/CN112126317A/en not_active Withdrawn
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107779040A (en) * | 2016-08-27 | 2018-03-09 | 江苏冠军涂料科技集团股份有限公司 | A kind of anti-corrosion Environmental Protective Water-paint and preparation method thereof |
| CN106752689A (en) * | 2016-11-30 | 2017-05-31 | 深圳市创智成功科技有限公司 | Paints Curing under Water and preparation method thereof |
| CN106634448A (en) * | 2016-12-30 | 2017-05-10 | 上海美东生物材料股份有限公司 | Waterborne epoxy flash-rust preventing paint |
| CN110078883A (en) * | 2019-05-22 | 2019-08-02 | 西华大学 | A kind of water paint resin, preparation method and composition based on konjaku flour |
Non-Patent Citations (1)
| Title |
|---|
| 吕中华等: "《特产蔬菜栽培与病虫害防治技术》", 31 January 2004, 中国农业出版社 * |
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