CN111454624A - Water-based industrial dip-coating paint and preparation process thereof - Google Patents
Water-based industrial dip-coating paint and preparation process thereof Download PDFInfo
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- CN111454624A CN111454624A CN201911411722.5A CN201911411722A CN111454624A CN 111454624 A CN111454624 A CN 111454624A CN 201911411722 A CN201911411722 A CN 201911411722A CN 111454624 A CN111454624 A CN 111454624A
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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
- C09D133/00—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 only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; 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
- 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
- C09D167/08—Polyesters modified with higher fatty oils or their acids, or with natural resins or resin 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
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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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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Wood Science & Technology (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Paints Or Removers (AREA)
Abstract
The invention discloses a preparation process of a water-based industrial dip-coating paint, which is prepared by the following steps: dispersing: sequentially adding water-soluble resin, deionized water, a functional assistant, high-pigment carbon black, an anti-rust pigment and a filler into a stirring tank according to the formula amount, rotating speed of 800r/min, and dispersing for 15 min; grinding: grinding the dispersed slurry on a sand mill, and performing fineness detection every 15min until the fineness of the slurry is less than or equal to 30 mu m; diluting: and (3) putting the slurry with qualified grinding fineness into a paint mixing container, and adjusting to the required viscosity to obtain the water-based industrial dip coating. The process can improve the paint preparation efficiency.
Description
Technical Field
The invention relates to a preparation process of a water-based industrial dip-coating paint, and also relates to the water-based industrial dip-coating paint suitable for the preparation process.
Background
The surface of the metal material is easily damaged to form rust due to the oxidation of air in the using process, so that the metal material needs to be protected by anticorrosive coating, and the metal material is not influenced before and after application. The anticorrosion coating mode is various, and common modes include spraying, brushing, roller coating, dip coating, curtain coating and the like. The dip-coating construction mode has the advantages of simple operation of the application process, high coating production efficiency, high utilization rate of the coating, low labor intensity of workers and continuous production, and is widely applied to a plurality of fields. In the field of motor vehicles, the parts are particularly suitable for coating in a dip-coating construction mode as special-shaped components due to the characteristics of small size, multiple types and complex structure, and the industrial application prospect is particularly wide.
In recent years, energy-saving and environment-friendly water-based anticorrosive coatings are rapidly developed, and water is used as a dispersion medium to replace organic solvents completely or partially, so that the water-based dip coating has the advantages of low VOC content, environmental friendliness and the like, and is a focus and a hot point of research at present. Most of the research on the development and application of the paint and the construction process is more, but the influence factors of the preparation process of the dip-coating paint are rarely analyzed.
Disclosure of Invention
The invention aims to provide a preparation process of an aqueous industrial dip-coating paint, which can improve the paint preparation efficiency.
A preparation process of an aqueous industrial dip-coating paint comprises the following steps:
dispersing: sequentially adding water-soluble resin, deionized water, a functional assistant, high-pigment carbon black, an anti-rust pigment and a filler into a stirring tank according to the formula amount, rotating speed of 800r/min, and dispersing for 15 min;
grinding: grinding the dispersed slurry on a sand mill, and performing fineness detection every 15min until the fineness of the slurry is less than or equal to 30 mu m;
diluting: and (3) putting the slurry with qualified grinding fineness into a paint mixing container, and adjusting to the required viscosity to obtain the water-based industrial dip coating.
Further, in the grinding stage, zirconium beads with a diameter of 1.4mm were selected, and the volume ratio of the zirconium beads to the slurry was 1/4.
Further, the water-soluble resin is a waterborne alkyd modified acrylic resin.
Furthermore, the functional auxiliary agent comprises a neutralizing agent, a wetting dispersant, a defoaming agent and a drier.
Furthermore, the functional auxiliary agent is added according to the sequence of a neutralizer, a wetting dispersant, a defoaming agent and a drier.
Further, the addition amount of the neutralizing agent is 2 percent.
Further, the addition amount of the wetting dispersant is 1.5 percent.
Further, the addition amount of the defoaming agent is 0.08%.
Further, the addition amount of the drier is 1.1%.
The paint suitable for the preparation process of the water-based industrial dip-coating paint comprises the following raw materials in percentage by weight:
the preparation process of the water-based industrial dip-coating paint has the following beneficial effects:
the best grinding efficiency can be achieved in the water-soluble resin according to the charging sequence of the functional auxiliary agent, the high-pigment carbon black and the antirust pigment which are finally added into the filler. The pigment filler has certain oil absorption as solid powder in the dispersion process of the sizing agent, and the high-pigment carbon black needs to be added preferentially after the functional auxiliary agent is added because the oil absorption of the pigment filler is larger than that of the filler, so that the resin liquid and the functional auxiliary agent can fully soak the carbon black, and the rest antirust pigment and filler with smaller oil absorption are added, and the powder of the whole system is optimally filled without flocculation after being wetted in the resin liquid, thereby better dispersing, reducing the grinding time and improving the grinding efficiency.
The water-soluble resin is added according to the formula amount in the dispersing stage, the efficiency is highest under the condition of whole material grinding, because the whole material grinding takes the resin base material as a carrier in the grinding process of the sizing agent, and the pigment and the filler can realize the best infiltration and coating under the action of the functional auxiliary agent, so that the whole sizing agent system is ground under the best dispersing state, thereby achieving the best grinding effect.
The functional auxiliary agent is added according to the sequence of the neutralizer, the wetting dispersant, the defoamer and the drier, the neutralizer is added into the system firstly, and then the water solubility of the resin is increased, so that the wetting and wrapping effect of the resin on the pigment filling is improved, the dispersing and grinding efficiency is further improved, the neutralizer can effectively adjust the pH value of the system in a water-soluble resin system, and the system is endowed with good pH stability. Not only has salifying function, but also has auxiliary solvent function. Has the function of high-efficiency dispersion assistance, and the addition amount of the dispersion assistance directly influences the water solubility and the stability of the resin, so that different results are shown in the dispersion grinding stage. When the dosage of the neutralizing agent reaches 2%, the resin neutralization state reaches the best, the water solubility is better, and the effect of coating pigments and fillers is better.
During the dispersion of the pigment/filler, mechanical force applies energy to the system, causing the pigment/filler to form smaller particles. But these fine particles will tend to break away from the high energy state and revert back to the original low energy state. During the pigment grinding process, the pigment agglomerates become progressively smaller; it is desirable to obtain stable particles. An agglomerate is a "collection" of pigment particles, the interior spaces between individual particles of pigment containing air and moisture. The particles are in contact with each other at edges and corners, and the interaction between the particles is relatively small, so that the force can be overcome by a general dispersing device. The order of addition of the wetting dispersing aids can affect the wetting of the resin on the pigment agglomerates, thereby affecting the dispersion grinding effect. Each process of pigment grinding can be divided into three steps, the first step, all air and moisture on the pigment surface are driven out and replaced by resin solution. The resin solution must penetrate into the spaces between the agglomerates. The second step is the actual pigment grinding process, whereby the pigment agglomerates are broken up by mechanical energy (impact and shear forces) and the particle size is reduced. In the final third step, the pigment dispersion must be stabilized to prevent the formation of uncontrolled flocculation. Wetting and stabilization may be affected by the adjuvant. The wetting dispersion aid can accelerate wetting of the pigment agglomerates by the resin, and improve stability of the pigment dispersion, thereby improving dispersion grinding efficiency. When the dosage of the wetting dispersant is 1.5 percent, the dosage can well accelerate the wetting of the resin liquid to the pigment and filler, and the defects of flocculation, gloss reduction, floating and floating, precipitation and the like are prevented.
The reduction of foams in the dispersion stage can effectively improve the acting force of mechanical shearing on the pigment filler in the grinding stage, thereby shortening the dispersion grinding time of the pigment filler and improving the dispersion grinding efficiency. And adding a defoaming agent after wetting the dispersing agent, wherein the wetting agent accelerates the wetting of the resin liquid on the pigments and fillers so that air on the surfaces of the pigments and fillers is easily removed. When the dosage of the defoaming agent is 0.08%, the dosage can well remove bubbles in the resin liquid and on the surface of the pigment and filler caused by mechanical stirring.
The drier is related to the compatibility of the system, the addition sequence of the drier can directly influence the dispersion grinding effect of the system, and the drier is a substance capable of accelerating the film forming and curing of the air-drying alkyd resin, and the addition sequence of the drier can generate adverse influence on the wetting and dispersion of the system. The drier is added with other auxiliary agents to facilitate the dispersion and grinding of the system. When the consumption of the drier is 1.1%, the drier can enable metal soap components contained in the drier to fully adsorb pigments and fillers in the later period in the resin liquid, so that the problems of flocculation and the like are prevented, and the grinding efficiency is the best.
Detailed Description
Based on the design idea of the invention, the preparation process of the aqueous industrial dip-coating paint of the invention is further described in detail with reference to the following specific examples:
the aqueous industrial dip-coating paint formulation was designed as follows:
example 1
The preparation process of the water-based industrial dip coating paint according to the formula comprises the following steps:
dispersing: sequentially adding the waterborne alkyd modified acrylic resin, deionized water, a neutralizing agent, a wetting dispersant, a defoaming agent, a drier, high-pigment carbon black, an anti-rust pigment and a filler into a stirring tank according to the formula amount, and dispersing for 15min at the rotating speed of 800 r/min;
grinding: grinding the dispersed slurry on a sand mill, and performing fineness detection every 15min until the fineness of the slurry is less than or equal to 30 mu m;
diluting: and (3) putting the slurry with qualified grinding fineness into a paint mixing container, and adjusting to the required viscosity to obtain the water-based industrial dip coating.
Example 2
The preparation process of the water-based industrial dip coating paint according to the formula comprises the following steps:
dispersing: sequentially adding the waterborne alkyd modified acrylic resin, deionized water, a neutralizing agent, a drier, a defoaming agent, a wetting dispersant, high-pigment carbon black, an anti-rust pigment and a filler into a stirring tank according to the formula amount, and dispersing for 15min at the rotating speed of 800 r/min;
grinding: grinding the dispersed slurry on a sand mill, and performing fineness detection every 15min until the fineness of the slurry is less than or equal to 30 mu m;
diluting: and (3) putting the slurry with qualified grinding fineness into a paint mixing container, and adjusting to the required viscosity to obtain the water-based industrial dip coating.
The above-mentioned fineness of 30 μm can be achieved by 1.5 hours of grinding in example 1, and the fineness of 30 μm can be achieved by 2 hours of grinding in example 2.
Claims (10)
1. A preparation process of an aqueous industrial dip-coating paint is characterized by comprising the following steps: the preparation method comprises the following steps:
dispersing: sequentially adding water-soluble resin, deionized water, a functional assistant, high-pigment carbon black, an anti-rust pigment and a filler into a stirring tank according to the formula amount, rotating speed of 800r/min, and dispersing for 15 min;
grinding: grinding the dispersed slurry on a sand mill, and performing fineness detection every 15min until the fineness of the slurry is less than or equal to 30 mu m;
diluting: and (3) putting the slurry with qualified grinding fineness into a paint mixing container, and adjusting to the required viscosity to obtain the water-based industrial dip coating.
2. The process for the preparation of an aqueous industrial dip-coating paint according to claim 1, characterized in that: in the grinding stage, zirconium beads with a diameter of 1.4mm were selected, and the volume ratio of the zirconium beads to the slurry was 1/4.
3. The process for the preparation of an aqueous industrial dip-coating paint according to claim 1, characterized in that: the water-soluble resin is water-based alkyd modified acrylic resin.
4. Process for the preparation of an aqueous industrial dip-coating paint according to claim 3, characterized in that: the functional assistant comprises a neutralizer, a wetting dispersant, a defoaming agent and a drier.
5. Process for the preparation of an aqueous industrial dip-coating paint according to claim 4, characterized in that: the functional auxiliary agent is added according to the sequence of a neutralizer, a wetting dispersant, a defoaming agent and a drier.
6. Process for the preparation of an aqueous industrial dip-coating paint according to claim 4, characterized in that: the addition amount of the neutralizing agent is 2 percent.
7. Process for the preparation of an aqueous industrial dip-coating paint according to claim 4, characterized in that: the addition amount of the wetting dispersant is 1.5 percent.
8. Process for the preparation of an aqueous industrial dip-coating paint according to claim 4, characterized in that: the addition of the defoaming agent is 0.08 percent.
9. Process for the preparation of an aqueous industrial dip-coating paint according to claim 4, characterized in that: the addition amount of the drier is 1.1 percent.
10. A coating suitable for use in the process for the preparation of an aqueous industrial dip-coating paint according to any one of claims 1 to 9, characterized in that: the material consists of the following raw materials in percentage by weight:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911411722.5A CN111454624A (en) | 2019-12-31 | 2019-12-31 | Water-based industrial dip-coating paint and preparation process thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911411722.5A CN111454624A (en) | 2019-12-31 | 2019-12-31 | Water-based industrial dip-coating paint and preparation process thereof |
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| CN111454624A true CN111454624A (en) | 2020-07-28 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201911411722.5A Pending CN111454624A (en) | 2019-12-31 | 2019-12-31 | Water-based industrial dip-coating paint and preparation process thereof |
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Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109181439A (en) * | 2018-06-13 | 2019-01-11 | 河北晨阳工贸集团有限公司 | A kind of low-VOC aqueous dip painting and preparation method thereof |
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- 2019-12-31 CN CN201911411722.5A patent/CN111454624A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109181439A (en) * | 2018-06-13 | 2019-01-11 | 河北晨阳工贸集团有限公司 | A kind of low-VOC aqueous dip painting and preparation method thereof |
Non-Patent Citations (2)
| Title |
|---|
| 卢少忠: "《建筑涂料工程 性能•生产•施工》", 31 August 2007, 中国建材工业出版社 * |
| 朱万强: "《涂料基础教程》", 30 June 2012, 西南交通大学出版社 * |
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Application publication date: 20200728 |