CN112552810A - Water-based steel pipe antirust coating and preparation method thereof - Google Patents
Water-based steel pipe antirust coating and preparation method thereof Download PDFInfo
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- CN112552810A CN112552810A CN202011587098.7A CN202011587098A CN112552810A CN 112552810 A CN112552810 A CN 112552810A CN 202011587098 A CN202011587098 A CN 202011587098A CN 112552810 A CN112552810 A CN 112552810A
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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
- 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
- C09D163/10—Epoxy resins modified by unsaturated compounds
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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
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/08—Anti-corrosive paints
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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
- C09D7/20—Diluents or solvents
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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
- C08L2203/00—Applications
- C08L2203/18—Applications used for pipes
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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
- C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
- C08L2205/025—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure
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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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- Organic Chemistry (AREA)
- Paints Or Removers (AREA)
Abstract
The invention relates to the technical field of antirust coatings, in particular to a water-based steel pipe antirust coating and a preparation method thereof. The water-based steel pipe antirust coating comprises the following components in parts by weight: 40-60 parts of aliphatic polyurethane aqueous dispersion; 20-40 parts of a water-based epoxy ester dispersion; 1-3 parts of polyethylene wax emulsion; 2-4 parts of a film-forming assistant; 1-3 parts of phosphorus-containing strontium silicate; 0.5-1.0 part of pigment; 0.1-0.3 part of defoaming agent; 0.1-0.5 part of thickening agent; 0.3-1.0 part of dispersant; 5-15 parts of deionized water. According to the invention, the aliphatic polyurethane aqueous dispersion, the aqueous epoxy ester dispersion, the polyethylene wax emulsion, the film forming additive, the strontium phosphosilicate, the pigment, the defoaming agent, the thickening agent, the dispersing agent and the deionized water with specific contents are mixed, so that the prepared aqueous steel pipe antirust coating can realize low VOC, is safe and environment-friendly, has more excellent antirust performance, and has good anticorrosion effect and drying performance, thus being capable of replacing solvent-based coatings and having excellent market prospect.
Description
Technical Field
The invention relates to the technical field of antirust coatings, in particular to a water-based steel pipe antirust coating and a preparation method thereof.
Background
With the development of science and technology, steel pipes are closely related to our lives, water and gas for daily life are conveyed by using the steel pipes, and the steel pipes are needed for capital construction, oil exploitation and the like. The annual domestic steel pipe yield is about 7000 ten thousand tons. In order to prevent the steel pipe from rusting in the processes of storage and transportation, the steel pipe needs to be sprayed or brushed with an antirust coating after being produced. With the increase in the demand for steel pipes, the demand for rust inhibitive paint has also increased in step.
At present, the antirust coating used for the steel pipe is mainly solvent-based coating. The solvent-based coating has excellent anti-corrosion effect and drying property, and is widely applied in the industrial field. But the solvent-based coating has hidden troubles in the aspects of safety and environmental protection. The VOC discharge accompanying the construction thereof can damage the ozone layer, cause pollution to the atmosphere and cause the construction personnel to suffer from diseases of the upper respiratory tract, the heart and the lung. With the increasing improvement of national policy and regulation, the emission limit of VOC by the country is more and more strict. The paint is imperative to environment-friendly upgrading, and the development prospect of water-based paint and other types of paint is bright.
Disclosure of Invention
The invention aims to provide a water-based steel pipe antirust coating.
The invention also aims to provide a preparation method of the water-based steel pipe antirust coating.
In order to solve the above problems, the following technical solutions are adopted.
The water-based steel pipe antirust coating comprises the following components in parts by weight: 40-60 parts of aliphatic polyurethane aqueous dispersion; 20-40 parts of a water-based epoxy ester dispersion; 1-3 parts of polyethylene wax emulsion; 2-4 parts of a film-forming assistant; 1-3 parts of phosphorus-containing strontium silicate; 0.5-1.0 part of pigment; 0.1-0.3 part of defoaming agent; 0.1-0.5 part of thickening agent; 0.3-1.0 part of dispersant; 5-15 parts of deionized water.
Preferably, the water-based steel pipe antirust coating comprises the following components: 50 parts of aliphatic polyurethane aqueous dispersion; 30 parts of an aqueous epoxy ester dispersion; 2 parts of polyethylene wax emulsion; 3 parts of a film-forming assistant; 2 parts of phosphorus-containing strontium silicate; 0.8 part of pigment; 0.2 part of defoaming agent; 0.2 part of thickening agent; 0.8 part of a dispersant; 11 parts of deionized water.
More preferably, the thickener is a polyurethane associative thickener.
More preferably, the pigment is carbon black.
More preferably, the coalescent is selected from one or a combination of dipropylene glycol methyl ether and dipropylene glycol butyl ether.
The method for preparing the water-based steel pipe antirust coating comprises the following steps:
step one, sequentially adding the aqueous epoxy ester dispersoid, strontium phosphomolybdate, carbon black and a dispersant into a stirring kettle, stirring and mixing uniformly, and then grinding the obtained product to prepare a material A;
step two, sequentially adding the aliphatic polyurethane aqueous dispersion, the polyethylene wax emulsion, the film forming additive and the defoaming agent into deionized water, and then uniformly stirring and mixing to prepare a material B;
and step three, adding the material B into a stirring kettle, adding the material A and the thickening agent while stirring, and continuing stirring for 0.5-1 hour after all the materials are added.
Preferably, in the first step of the above preparation method, the resultant is ground to a fineness of 20 μm or less.
Compared with the prior art, the invention has the following beneficial effects:
according to the invention, the aliphatic polyurethane aqueous dispersion, the aqueous epoxy ester dispersion, the polyethylene wax emulsion, the film forming additive, the strontium phosphosilicate, the pigment, the defoaming agent, the thickening agent, the dispersing agent and the deionized water with specific contents are mixed, so that the prepared aqueous steel pipe antirust coating can realize low VOC, is safe and environment-friendly, has more excellent antirust performance, and has good anticorrosion effect and drying performance, thus being capable of replacing solvent-based coatings and having excellent market prospect.
Detailed Description
The following examples are given to illustrate the present invention and it should be noted that the following examples are only for illustrative purposes and should not be construed as limiting the scope of the present invention, and that the modification and modification of the present invention by those of ordinary skill in the art are not essential to the present invention.
Examples 1-10 preparation of aqueous Steel pipe antirust coatings:
according to the formula of the table 1, the following steps are carried out:
step one, sequentially adding the aqueous epoxy ester dispersoid, strontium phosphomolybdate, pigment and dispersant into a stirring kettle, stirring and mixing uniformly, and then grinding the obtained product to prepare a material A;
step two, sequentially adding the aliphatic polyurethane aqueous dispersion, the polyethylene wax emulsion, the film forming additive and the defoaming agent into deionized water, and then uniformly stirring and mixing to prepare a material B;
and step three, adding the material B into a stirring kettle, adding the material A and the thickening agent while stirring, and continuing stirring for 0.5-1 hour after all the materials are added.
Regarding the first step, the obtained object can be ground to the fineness of less than or equal to 20 microns, so that the pigment fineness is finer, the dispersibility and uniformity in the base material are better, the smoothness of the coating film is better, and the glossiness of the coating is improved.
It is worth mentioning that the water-based antirust coating is safer and more environment-friendly than the oil-based antirust coating. The aliphatic polyurethane aqueous dispersion as a main film forming agent has the characteristics of excellent early stackability, high hardness, fast drying and good fullness, can greatly improve the defects of lower hardness and poorer drying performance of a water-based coating compared with a solvent-based coating, contains extremely low or no Volatile Organic Compound (VOC), can be dried at low temperature, and is beneficial to reducing the using amount of a film forming aid, so that the VOC is effectively reduced, wherein the aliphatic polyurethane aqueous dispersion has higher molecular weight and higher porosity among molecular chains, and cannot provide good antirust performance, so the aliphatic polyurethane aqueous dispersion needs to be compounded; the aqueous epoxy ester dispersion is used as a secondary film forming agent, the main effect is that the excellent antirust performance of the aqueous epoxy ester dispersion is utilized to improve the salt spray resistance duration of the product, the molecular weight of the aqueous epoxy ester dispersion is small, gaps of the molecular structure of the aliphatic polyurethane aqueous dispersion can be effectively supplemented, a more compact coating structure is provided, and the combination of the two can ensure that the coating effect of the coating is better; the polyethylene wax emulsion can greatly improve the anti-adhesion performance of the coating under the condition of not influencing the glossiness of the coating, and prevent the problem that a large number of paint films are adhered and fall off due to excessive extrusion in the later packing process of the steel pipe; the antirust additive contains strontium phosphosilicate as a coating, contains no zinc and heavy metal, can form a compact oxide layer on the surface of the steel pipe, prevents corrosion medium erosion, and can greatly improve the antirust performance of the coating; the film-forming assistant can dissolve and swell polymer particles in the emulsion, so that the particles can generate plastic flow and elastic deformation along with the volatilization of water at a lower temperature to coalesce into a film, but can volatilize and escape within a shorter time after the film is formed, the glass transition temperature of the film is not influenced, and the film does not stick back at a high temperature.
The pigment is carbon black, a black coating effect can be provided, the appearance of the hot-rolled steel pipe is more attractive, the carbon black and strontium phosphomolybdate can be stably dispersed by the dispersant, the carbon black and the strontium phosphomolybdate can be stably dispersed in the coating without sedimentation and agglomeration, and the dispersant can be a Dispuer S19 dispersant; the thickening agent is a polyurethane associative thickening agent and is a viscosity adjusting and rheological additive, so that the anti-sagging capacity of the coating in the construction process can be improved, and the neutralizing agent can adjust the pH value, so that the coating is alkalescent, and the polyurethane associative thickening agent is ensured to play a thickening role; the defoaming agent can play a role in controlling foam, the coating effect of the coating is improved, and the defoaming agent can be a TEGO825 defoaming agent.
It is noted that polyurethane associative thickeners (HEUR) are a class of highly effective associative thickeners, and both in pure water and in emulsions, the thickening mechanism is a physical network cross-linked structure formed by hydrophobic association, and a good thickening effect can be achieved. The association between the polyurethane associative thickener and the latex system particles increases molecular potential energy, keeps higher apparent viscosity under the action of high shear, and thus effectively improves the fullness of a latex coating. Meanwhile, with the disappearance of the shearing force, the network structure of the system is gradually recovered, so that the leveling property of the latex paint is improved.
In the embodiment, the film forming assistant is selected from one or a combination of two of dipropylene glycol methyl ether and dipropylene glycol butyl ether, so that the film forming effect of the coating in low-temperature construction can be ensured, and the cracking of a coating film can be prevented.
Comparative examples 1-6 preparation of anticorrosive coatings:
prepared according to the formulation of table 1, according to the preparation method of examples 1-10 above.
Performance data testing method
The water-based steel pipe antirust paint prepared in each example and the antirust paint prepared in each comparative example were sprayed onto five hot-rolled steel pipes by a spray gun, baked at 60-70 ℃ for 20 minutes, and naturally dried for 24 hours, and then the performance of the coating film was tested according to the following criteria.
And (3) hardness testing: testing the first hot-rolled steel pipe according to GB/T6739-2006 'determination of paint film hardness by using a colored paint and varnish pencil method';
and (4) grid scribing adhesion testing: the second hot-rolled steel tube was tested according to GB/T9286-1998 test for marking out paint films of colored paint and varnish;
and (3) testing the glossiness: the third hot-rolled steel pipe was tested according to GB/T9754-2007 determination of 20 °, 60 ° and 85 ° specular gloss of pigmented paint films in which the paints and varnishes do not contain metallic pigments;
impact resistance test, namely testing the fourth hot-rolled steel pipe according to GB/T1732-1993 paint film impact resistance testing method, and observing paint films under the high impact of 40cm, 50cm and 60cm by using a 4-time magnifier to determine whether cracks, wrinkles and peeling exist;
and (3) testing neutral salt spray resistance: testing a fifth hot-rolled steel pipe according to GB/T1771-2007 'determination of neutral salt spray resistance of colored paint and varnish', placing the fifth hot-rolled steel pipe in a salt spray box, and observing an experimental phenomenon after 240 hours;
the specific test results of the above five experiments are shown in table 2 below.
TABLE 1 formulation of anticorrosive coating for water-based steel pipes in examples 1-10 and formulation (parts by weight) of anticorrosive coating in comparative examples 1-6
TABLE 2 results of testing the Performance data of examples 1-10 and comparative examples 1-6
As is apparent from Table 2, the aqueous rust inhibitive coatings for steel pipes in examples 1 to 10 exhibited better performance than the rust inhibitive coatings for steel pipes in comparative examples 1 to 6, and the paint films were free from cracks, wrinkles and peeling under impact tests at heights of 40cm, 50cm and 60cm, i.e., the aqueous rust inhibitive coatings for steel pipes in the present invention exhibited excellent impact resistance, and also exhibited the characteristics of high hardness, good cross-hatch adhesion and good gloss, and in addition, exhibited excellent neutral salt spray resistance.
Claims (7)
1. The water-based steel pipe antirust coating is characterized by comprising the following components in parts by weight: the paint comprises the following components in parts by weight: 40-60 parts of aliphatic polyurethane aqueous dispersion; 20-40 parts of a water-based epoxy ester dispersion; 1-3 parts of polyethylene wax emulsion; 2-4 parts of a film-forming assistant; 1-3 parts of phosphorus-containing strontium silicate; 0.5-1.0 part of pigment; 0.1-0.3 part of defoaming agent; 0.1-0.5 part of thickening agent; 0.3-1.0 part of dispersant; 5-15 parts of deionized water.
2. The aqueous steel pipe anticorrosive paint according to claim 1, characterized in that: the paint comprises the following components in parts by weight: 50 parts of aliphatic polyurethane aqueous dispersion; 30 parts of an aqueous epoxy ester dispersion; 2 parts of polyethylene wax emulsion; 3 parts of a film-forming assistant; 2 parts of phosphorus-containing strontium silicate; 0.8 part of pigment; 0.2 part of defoaming agent; 0.2 part of thickening agent; 0.8 part of a dispersant; 11 parts of deionized water.
3. The aqueous steel pipe anticorrosive paint according to claim 1 or 2, characterized in that: the thickener is a polyurethane associative thickener.
4. The aqueous steel pipe anticorrosive paint according to claim 1 or 2, characterized in that: the pigment is carbon black.
5. The aqueous steel pipe anticorrosive paint according to claim 1 or 2, characterized in that: the film forming assistant is selected from one or a combination of two of dipropylene glycol methyl ether and dipropylene glycol butyl ether.
6. A method for producing the aqueous steel pipe anticorrosive paint of any one of claims 1 to 5, characterized in that: the method comprises the following steps:
step one, sequentially adding the aqueous epoxy ester dispersoid, strontium phosphomolybdate, pigment and dispersant into a stirring kettle, stirring and mixing uniformly, and then grinding the obtained product to prepare a material A;
step two, sequentially adding the aliphatic polyurethane aqueous dispersion, the polyethylene wax emulsion, the film forming additive and the defoaming agent into deionized water, and then uniformly stirring and mixing to prepare a material B;
and step three, adding the material B into a stirring kettle, adding the material A and the thickening agent while stirring, and continuing stirring for 0.5-1 hour after all the materials are added.
7. The method of producing an aqueous rust inhibitive coating for hot rolled steel pipes according to claim 6, characterized in that: in the first step, the obtained object is ground to the fineness of less than or equal to 20 microns.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011587098.7A CN112552810A (en) | 2020-12-29 | 2020-12-29 | Water-based steel pipe antirust coating and preparation method thereof |
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| CN202011587098.7A CN112552810A (en) | 2020-12-29 | 2020-12-29 | Water-based steel pipe antirust coating and preparation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6264872A (en) * | 1985-09-18 | 1987-03-23 | Nippon Paint Co Ltd | Primer composition for metallic material and method of coating |
| CN102559026A (en) * | 2011-11-25 | 2012-07-11 | 中国科学院金属研究所 | High-performance aqueous non-toxic and anti-corrosion coating and preparation method thereof |
| CN103436136A (en) * | 2013-07-24 | 2013-12-11 | 广州擎天材料科技有限公司 | Room-temperature-curable aqueous anticorrosion primer used for coating external surface of construction crane and preparation method of primer |
| CN107286798A (en) * | 2017-07-10 | 2017-10-24 | 湖南邦弗特新材料技术有限公司 | A kind of salt spray resistance, ageing-resistant water paint and preparation method thereof |
| CN108250927A (en) * | 2018-01-12 | 2018-07-06 | 哈尔滨雨阳佳泰环保新材料有限公司 | A kind of aqueous polyurethane severe anti-corrosion primer and preparation method thereof |
| CN109554091A (en) * | 2018-11-12 | 2019-04-02 | 安徽科创美涂料科技股份有限公司 | A kind of preparation method of low temperature resistant high rigidity lacquer |
| CN110499079A (en) * | 2019-08-20 | 2019-11-26 | 成都拜迪新材料有限公司 | Watersoluble modified acrylic acid iron oxide red anti-corrosive primer of resistance to greasy dirt and preparation method thereof |
| CN111995945A (en) * | 2020-09-03 | 2020-11-27 | 邦弗特新材料股份有限公司 | Quick-drying type water-based acrylic acid-polyurethane-epoxy ester ternary anti-corrosion emulsion and preparation method thereof |
-
2020
- 2020-12-29 CN CN202011587098.7A patent/CN112552810A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6264872A (en) * | 1985-09-18 | 1987-03-23 | Nippon Paint Co Ltd | Primer composition for metallic material and method of coating |
| CN102559026A (en) * | 2011-11-25 | 2012-07-11 | 中国科学院金属研究所 | High-performance aqueous non-toxic and anti-corrosion coating and preparation method thereof |
| CN103436136A (en) * | 2013-07-24 | 2013-12-11 | 广州擎天材料科技有限公司 | Room-temperature-curable aqueous anticorrosion primer used for coating external surface of construction crane and preparation method of primer |
| CN107286798A (en) * | 2017-07-10 | 2017-10-24 | 湖南邦弗特新材料技术有限公司 | A kind of salt spray resistance, ageing-resistant water paint and preparation method thereof |
| CN108250927A (en) * | 2018-01-12 | 2018-07-06 | 哈尔滨雨阳佳泰环保新材料有限公司 | A kind of aqueous polyurethane severe anti-corrosion primer and preparation method thereof |
| CN109554091A (en) * | 2018-11-12 | 2019-04-02 | 安徽科创美涂料科技股份有限公司 | A kind of preparation method of low temperature resistant high rigidity lacquer |
| CN110499079A (en) * | 2019-08-20 | 2019-11-26 | 成都拜迪新材料有限公司 | Watersoluble modified acrylic acid iron oxide red anti-corrosive primer of resistance to greasy dirt and preparation method thereof |
| CN111995945A (en) * | 2020-09-03 | 2020-11-27 | 邦弗特新材料股份有限公司 | Quick-drying type water-based acrylic acid-polyurethane-epoxy ester ternary anti-corrosion emulsion and preparation method thereof |
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