CN110922877A - Waterborne polyurethane coating and preparation method thereof - Google Patents
Waterborne polyurethane coating and preparation method thereof Download PDFInfo
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- CN110922877A CN110922877A CN201911284511.XA CN201911284511A CN110922877A CN 110922877 A CN110922877 A CN 110922877A CN 201911284511 A CN201911284511 A CN 201911284511A CN 110922877 A CN110922877 A CN 110922877A
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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
- 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
Abstract
The invention relates to a waterborne polyurethane coating and a preparation method thereof, wherein the waterborne polyurethane coating comprises a component A and a component B, wherein the component A comprises the following raw materials in parts by weight: 12-15 parts of deionized water, 40-65 parts of water-based polyol resin dispersoid, 1-2 parts of flatting agent, 0.5-1 part of defoaming agent, 0.5-1 part of base material wetting agent and 15-50 parts of pigment and filler color paste, wherein the component B comprises the following raw materials in parts by weight: 10-20 parts of solvent, 1-2 parts of auxiliary agent and 80-90 parts of polyisocyanate. The waterborne polyurethane coating provided by the invention breaks through the problems of slow drying, low hardness, poor water resistance, solvent resistance and other physical and chemical properties and the like of the existing waterborne polyurethane by optimizing the formula structure of the coating components, and has the advantages of high hardness, good abrasion resistance, good water resistance and solvent resistance, convenient construction and low cost.
Description
Technical Field
The invention relates to the technical field of coatings, in particular to a waterborne polyurethane coating and a preparation method thereof.
Background
With the health of environmental regulations and environmental awareness of people in various countries, the emission of Volatile Organic Compounds (VOC) and Harmful Air Pollutants (HAP) in traditional solvent-based coatings is increasingly restricted, and the development of low-pollution, high-performance and multifunctional environmental-friendly water-based coatings becomes the main direction of coating technology development. The aqueous polyurethane coating is a coating which takes aqueous polyurethane resin as a base material and water as a dispersion medium. The waterborne polyurethane coating modified by crosslinking has good storage stability, mechanical properties of a coating film, water resistance, solvent resistance and aging resistance, and the performance of the waterborne polyurethane coating is similar to that of the traditional solvent type polyurethane coating, so that the waterborne polyurethane coating is an important development direction of the waterborne polyurethane coating.
Along with the enhancement of the environmental awareness of people and the limitation of environmental laws and regulations of various countries on the discharge amount of Volatile Organic Compounds (VOC), the research and development of waterborne polyurethane are increasingly paid attention. The polyurethane coating in the prior art has the problems of slow drying, low hardness, easy re-adhesion, film fullness which is not higher than that of a solvent-based coating, poorer physicochemical properties such as water resistance, solvent resistance and the like, higher production cost, high construction environment requirement and complex coating process.
Disclosure of Invention
Based on the above, the invention aims to provide the waterborne polyurethane coating which has the advantages of high hardness, wear resistance, good environmental friendliness, difficult combustion, low cost, convenience in construction and good water resistance.
The waterborne polyurethane coating comprises a component A and a component B, wherein the component A comprises the following raw materials in parts by weight: 12-15 parts of deionized water, 40-65 parts of water-based polyol resin dispersoid, 1-2 parts of flatting agent, 0.5-1 part of defoaming agent, 0.5-1 part of base material wetting agent and 15-50 parts of pigment and filler color paste, wherein the component B comprises the following raw materials in parts by weight: 10-20 parts of solvent, 1-2 parts of auxiliary agent and 80-90 parts of polyisocyanate.
Compared with the prior art, the waterborne polyurethane coating provided by the invention breaks through the problems of slow drying, low hardness, poor water resistance, solvent resistance and other physical and chemical properties and the like of the existing waterborne polyurethane by optimizing the formula structure of the coating components, and has the advantages of high hardness, good abrasion resistance, good water resistance and good solvent resistance, convenient construction and low cost.
Further, the polyol resin dispersion is a polyacrylate polyol dispersion with a glass transition temperature of 40-60 ℃ and a hydroxyl functionality of at least 2, and by optimizing the polyol resin dispersion, further limitation of the glass transition temperature contributes to improvement of the drying property of the produced aqueous polyurethane coating, and simultaneously improves the weather resistance, water resistance and mechanical strength of the aqueous polyurethane coating film.
Further, the polyisocyanate includes aliphatic and/or alicyclic polyisocyanate. By using the aliphatic or alicyclic polyisocyanate and optimally limiting the use ratio of the aliphatic or alicyclic polyisocyanate, the water solubility of the waterborne polyurethane coating is realized, and the water resistance of the waterborne polyurethane coating is improved.
Further, the aliphatic or alicyclic polyisocyanate is selected from one or more of hexamethylene diisocyanate, isophorone diisocyanate, and 4,4' -dicyclohexylmethane diisocyanate.
Further, the leveling agent is selected from one or more of a surfactant, polyacrylic acid and carboxymethyl cellulose, and can effectively reduce the surface tension of the finishing liquid, improve the leveling property and uniformity of the finishing liquid and contribute to forming a flat, smooth and uniform coating film.
Further, the defoaming agent is one or more of organic silicon polyether ester, mineral oil and C7-C9 alcohol, so that the surface tension of the coating is reduced, the foam is prevented from forming or reduced, the generation of surface defects is reduced, and the influence on the film forming performance is avoided.
Furthermore, the substrate wetting agent is one or more of polysiloxane Gemini surfactant, carbonate Gemini surfactant and phosphate Gemini surfactant, the Gemini surfactant contains two polar groups and two nonpolar groups in molecules, so that an adsorption layer with the nonpolar groups facing gas and the polar groups facing solid in oriented arrangement is formed on the solid surface more easily, the solid surface with high free energy is changed into a low free energy surface due to the coverage of a hydrocarbon chain, and the substrate wettability of the coating is improved.
Compared with the prior art, the waterborne polyurethane coating provided by the invention breaks through the problems of slow drying, low hardness, poor water resistance, solvent resistance and other physical and chemical properties and the like of the existing waterborne polyurethane by optimizing the formula structure of the coating components, and the prepared waterborne polyurethane coating has the advantages of high hardness, good abrasion resistance, good water resistance and good solvent resistance, and is convenient to construct and low in cost. The waterborne polyurethane coating is further preferably limited, and the hydrophilic polyisocyanate curing agent and the hydrophobic polyisocyanate curing agent are matched for use, and the use ratio is preferably selected, so that the water solubility of the waterborne polyurethane coating is realized, and the water resistance of the waterborne polyurethane coating is improved. Meanwhile, various processing aids are optimized, so that the physical and chemical properties and the processing performance of the water-based anticorrosive coating are comprehensively improved, and the prepared water-based anticorrosive coating has the advantages of good room-temperature storage stability, excellent mechanical properties and strong corrosion resistance.
In addition, the invention also provides a preparation method of the waterborne polyurethane coating, which comprises the following specific operation steps:
1) adding the aqueous polyol dispersoid and deionized water into a production cylinder, and uniformly dispersing;
2) adding the flatting agent, the defoaming agent and the wetting agent into the mixed liquid obtained in the step 1) while dispersing, and uniformly dispersing;
3) adding the pigment and filler color paste into the mixed liquid obtained in the step 2) while dispersing, and uniformly dispersing; filtering to obtain component A;
4) adding the solvent, the auxiliary agent and the polyisocyanate while dispersing, and uniformly dispersing; filtering to obtain component B;
5) and packaging according to the packaging requirement after uniform dispersion.
Further, the components are added in the steps 2) to 4) under the condition of 400-500rpm in a dispersing way.
Further, the step 1) is dispersing for 10-20min under the rotation speed condition of 500-1500 rpm; in the step 2), the dispersion is carried out for 10-30min under the rotation speed condition of 600-1500 rpm; in the step 3), dispersing for 35-60min under the rotation speed condition of 600-1500 rpm; in the step 4), the dispersion is carried out for 10-20min under the rotation speed conditions of 600-1500 rpm.
Compared with the prior art, the preparation method of the waterborne polyurethane coating provided by the invention has the advantages of reasonable process arrangement, simple and convenient operation, environmental friendliness, high quality of the prepared coating film and wide application prospect.
Detailed Description
Example 1
The embodiment provides an aqueous polyurethane coating, which comprises a component A and a component B, wherein the component A comprises the following raw materials in parts by weight: 12 parts of deionized water, 40 parts of water-based polyol resin dispersoid, 1 part of flatting agent, 0.5 part of defoaming agent, 0.5 part of base material wetting agent and 15 parts of pigment and filler color paste, wherein the component B comprises the following raw materials in parts by weight: 10 parts of solvent, 1 part of auxiliary agent and 80 parts of polyisocyanate.
The polyol resin dispersion is a polyacrylate polyol dispersion with a glass transition temperature of 40-60 ℃, and the hydroxyl functionality of the polyol resin dispersion is at least 2; the polyisocyanate comprises aliphatic or alicyclic polyisocyanate, the aliphatic or alicyclic polyisocyanate is hexamethylene diisocyanate and isophorone diisocyanate, and the ratio of the aliphatic or alicyclic polyisocyanate to the isophorone diisocyanate is 1: 2; the leveling agent is an organic silicon leveling agent, the defoaming agent is organic silicon polyether ester, and the base material wetting agent is polysiloxane Gemini surfactant.
Example 2
The embodiment provides an aqueous polyurethane coating, which comprises a component A and a component B, wherein the component A comprises the following raw materials in parts by weight: 15 parts of deionized water, 65 parts of water-based polyol resin dispersoid, 2 parts of flatting agent, 1 part of defoaming agent, 1 part of base material wetting agent and 50 parts of pigment and filler color paste, wherein the component B comprises the following raw materials in parts by weight: 20 parts of solvent, 2 parts of auxiliary agent and 90 parts of polyisocyanate.
The polyol resin dispersion is a polyacrylate polyol dispersion with a glass transition temperature of 40-60 ℃, and the hydroxyl functionality of the polyol resin dispersion is at least 2; the polyisocyanate comprises aliphatic or alicyclic polyisocyanate, and the aliphatic or alicyclic polyisocyanate is isophorone diisocyanate; the leveling agent is a fluorocarbon leveling agent, the defoaming agent is mineral oil, and the base material wetting agent is a carbonate Gemini surfactant.
Example 3
The embodiment provides an aqueous polyurethane coating, which comprises a component A and a component B, wherein the component A comprises the following raw materials in parts by weight: 13 parts of deionized water, 50 parts of water-based polyol resin dispersoid, 1.5 parts of flatting agent, 0.8 part of defoaming agent, 0.8 part of base material wetting agent and 30 parts of pigment and filler color paste, wherein the component B comprises the following raw materials in parts by weight: 15 parts of solvent, 1.5 parts of auxiliary agent and 85 parts of polyisocyanate.
The polyol resin dispersion is a polyacrylate polyol dispersion with a glass transition temperature of 40-60 ℃, and the hydroxyl functionality of the polyol resin dispersion is at least 2; the polyisocyanate comprises aliphatic or alicyclic polyisocyanate which is hexamethylene diisocyanate and 4,4' -dicyclohexylmethane diisocyanate in a ratio of 1: 1.5; the leveling agent is a fluorocarbon leveling agent and an acrylate leveling agent, the defoaming agent is C7-C9 alcohol, and the base material wetting agent is a carbonate Gemini surfactant and a phosphate salt Gemini surfactant.
Compared with the prior art, the waterborne polyurethane coating provided by the invention breaks through the problems of slow drying, low hardness, poor water resistance, solvent resistance and other physical and chemical properties and the like of the existing waterborne polyurethane by optimizing the formula structure of the coating components, and the prepared waterborne polyurethane coating has the advantages of high hardness, good abrasion resistance, good water resistance and good solvent resistance, and is convenient to construct and low in cost. The waterborne polyurethane coating is further preferably limited, and the hydrophilic polyisocyanate curing agent and the hydrophobic polyisocyanate curing agent are matched for use, and the use ratio is preferably selected, so that the water solubility of the waterborne polyurethane coating is realized, and the water resistance of the waterborne polyurethane coating is improved. Meanwhile, various processing aids are optimized, so that the physical and chemical properties and the processing performance of the water-based anticorrosive coating are comprehensively improved, and the prepared water-based anticorrosive coating has the advantages of good room-temperature storage stability, excellent mechanical properties and strong corrosion resistance.
Example 4
The embodiment provides a preparation method of a water-based polyurethane coating, which comprises the following specific operation steps:
1) adding the aqueous polyol dispersoid and deionized water into a production cylinder, and dispersing for 10-20min at the rotating speed of 500-1500 rpm;
2) dispersing and simultaneously adding a flatting agent, a defoaming agent and a wetting agent into the mixed solution obtained in the step 1) under the rotation speed condition of 400-1500 rpm, and dispersing for 10-30min under the rotation speed condition of 600-1500 rpm;
3) dispersing the pigment and filler color paste under the rotation speed conditions of 400 plus materials and 500rpm, adding the pigment and filler color paste into the mixed liquid obtained in the step 2), and dispersing for 35-60min under the rotation speed conditions of 600 plus materials and 1500 rpm; filtering to obtain component A;
4) adding the solvent, the auxiliary agent and the polyisocyanate under the rotation speed conditions of 400-1500 rpm for dispersing for 10-20min and uniformly dispersing; filtering to obtain component B;
compared with the prior art, the preparation method of the waterborne polyurethane coating provided by the invention has the advantages of reasonable process arrangement, simple and convenient operation, environmental friendliness, high quality of the prepared coating film and wide application prospect.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention.
Claims (10)
1. The invention relates to a waterborne polyurethane coating and a preparation method thereof, which are characterized by comprising a component A and a component B, wherein the component A comprises the following raw materials in parts by weight: 12-15 parts of deionized water, 40-65 parts of water-based polyol resin dispersoid, 1-2 parts of flatting agent, 0.5-1 part of defoaming agent, 0.5-1 part of base material wetting agent and 15-50 parts of pigment and filler color paste, wherein the component B comprises the following raw materials in parts by weight: 10-20 parts of solvent, 1-2 parts of auxiliary agent and 80-90 parts of polyisocyanate.
2. The aqueous polyurethane coating according to claim 1, characterized in that: the polyol resin dispersion is a polyacrylate polyol dispersion having a glass transition temperature of 40-60 ℃ and a hydroxyl functionality of at least 2.
3. The aqueous polyurethane coating according to claim 1, characterized in that: the polyisocyanate includes aliphatic and/or alicyclic polyisocyanate.
4. The aqueous polyurethane coating according to claim 2, characterized in that: the aliphatic or alicyclic polyisocyanate is selected from one or more of hexamethylene diisocyanate, isophorone diisocyanate and 4,4' -dicyclohexylmethane diisocyanate.
5. The aqueous polyurethane coating according to claim 1, characterized in that: the leveling agent is selected from one or more of an organic silicon leveling agent, a fluorocarbon leveling agent and an acrylate leveling agent.
6. The aqueous polyurethane coating according to claim 1, characterized in that: the defoaming agent is one or more of organic silicon polyether ester, mineral oil and C7-C9 alcohol.
7. The aqueous polyurethane coating according to claim 1, characterized in that: the base material wetting agent is one or more of polysiloxane Gemini surfactant, carbonate Gemini surfactant and phosphate Gemini surfactant.
8. The preparation method of the waterborne polyurethane coating is characterized by comprising the following specific operation steps:
1) adding the aqueous polyol dispersoid and deionized water into a production cylinder, and uniformly dispersing;
2) adding the flatting agent, the defoaming agent and the wetting agent into the mixed liquid obtained in the step 1) while dispersing, and uniformly dispersing;
3) adding the pigment and filler color paste into the mixed liquid obtained in the step 2) while dispersing, and uniformly dispersing; filtering to obtain component A;
4) adding the solvent, the auxiliary agent and the polyisocyanate while dispersing, and uniformly dispersing; filtering to obtain component B;
5) and packaging according to the packaging requirement after uniform dispersion.
9. The method for preparing an aqueous polyurethane coating according to claim 8, characterized in that: in the steps 2) to 4), all the components are added under the conditions of 400-500rpm and dispersion.
10. The method for preparing an aqueous polyurethane coating according to claim 8, characterized in that: in the step 1), the dispersion is carried out for 10-20min under the rotation speed condition of 500-1500 rpm; in the step 2), the dispersion is carried out for 10-30min under the rotation speed condition of 600-1500 rpm; in the step 3), dispersing for 35-60min under the rotation speed condition of 600-1500 rpm; in the step 4), the dispersion is carried out for 10-20min under the rotation speed conditions of 600-1500 rpm.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911284511.XA CN110922877A (en) | 2019-12-13 | 2019-12-13 | Waterborne polyurethane coating and preparation method thereof |
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| CN201911284511.XA CN110922877A (en) | 2019-12-13 | 2019-12-13 | Waterborne polyurethane coating and preparation method thereof |
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| CN1494561A (en) * | 2000-09-04 | 2004-05-05 | Aqueous zk PUR systems | |
| CN105985710A (en) * | 2015-02-04 | 2016-10-05 | 常州市武进晨光金属涂料有限公司 | Waterborne short-process flashing base coat and coating method thereof |
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Application publication date: 20200327 |