CN108300003B - Water-based hot-melt PVDF (polyvinylidene fluoride) fluorocarbon coating as well as preparation method and application thereof - Google Patents
Water-based hot-melt PVDF (polyvinylidene fluoride) fluorocarbon coating as well as preparation method and application thereof Download PDFInfo
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- CN108300003B CN108300003B CN201610886135.1A CN201610886135A CN108300003B CN 108300003 B CN108300003 B CN 108300003B CN 201610886135 A CN201610886135 A CN 201610886135A CN 108300003 B CN108300003 B CN 108300003B
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- C09D127/00—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 a halogen; Coating compositions based on derivatives of such polymers
- C09D127/02—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 a halogen; Coating compositions based on derivatives of such polymers not modified by chemical after-treatment
- C09D127/12—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 a halogen; Coating compositions based on derivatives of such polymers not modified by chemical after-treatment containing fluorine atoms
- C09D127/16—Homopolymers or copolymers of vinylidene fluoride
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Abstract
The invention discloses a water-based hot-melt PVDF fluorocarbon coating, which comprises 50-70 wt% of film-forming substance, 15-25 wt% of inorganic pigment, 5-10 wt% of film-forming cosolvent and 5-20 wt% of deionized water. The invention also discloses a preparation method and application of the water-based hot-melt PVDF fluorocarbon coating. The water-based hot-melt PVDF fluorocarbon coating can be used for replacing a solvent-based hot-melt PVDF fluorocarbon coating, has the advantages of energy conservation, consumption reduction, environmental protection and emission reduction, and accords with the national long-term planning policy of energy conservation, emission reduction and environmental protection.
Description
Technical Field
The invention belongs to the field of coatings, and particularly relates to a water-based hot-melt PVDF fluorocarbon coating, a preparation method and application thereof.
Background
The prior aluminum alloy plate and section bar for exterior wall decoration curtain walls and the like use solvent hot-melt type PVDF fluorocarbon coating which has excellent long-term protective performance, because the structural main chain of fluororesin in a film forming substance is an F-C bond which is a chemical bond with the shortest bond length and the largest bond energy, the coating has excellent weather resistance, durability, chemical resistance, corrosion resistance and the like, and is applied to the coating of aluminum alloy plates and section bars for exterior wall decoration curtain walls of high-requirement buildings, airports and the like; the VOC content of the solvent hot-melt PVDF fluorocarbon coating is about 600g/L, the curing temperature of the base material is high (more than 230 ℃), the environmental pollution is serious, and the energy consumption is high.
As a substitute for solvent-based coatings, water-based coatings have the advantages of safety, environmental protection, energy conservation, health and the like, are rapidly developing and are a necessary trend in the future.
In conclusion, the safe, environment-friendly, energy-saving and healthy water-based hot-melt PVDF fluorocarbon coating is widely applied to aluminum alloys and metal substrates.
Disclosure of Invention
In view of the defects in the prior art, the invention aims to provide a water-based hot-melt PVDF fluorocarbon coating, a preparation method and application.
The purpose of the invention is realized by the following technical scheme:
a water-based hot-melt PVDF fluorocarbon coating comprises a film-forming substance, an inorganic pigment, a film-forming cosolvent and deionized water,
wherein the weight percentage of the film forming material, the inorganic pigment, the film forming cosolvent and the deionized water is 50-70 percent, 15-25 percent, 5-10 percent and 5-20 percent.
Preferably, the water-based hot-melt PVDF fluorocarbon coating comprises, by weight, 55-68% of a film-forming substance, 17-24% of an inorganic pigment, 5-8% of a film-forming cosolvent and 8-18% of deionized water.
Preferably, the water-based hot-melt PVDF fluorocarbon coating comprises, by weight, 58-65% of film-forming substances, 19-22% of inorganic pigments, 5-6% of film-forming cosolvent and 10-16% of deionized water.
According to the water-based hot-melt PVDF fluorocarbon coating, the film forming substance comprises polyvinylidene fluoride emulsion and acrylic emulsion, wherein the weight ratio of the polyvinylidene fluoride emulsion to the acrylic emulsion is 7: 3;
the fluorine content of the polyvinylidene fluoride emulsion is more than or equal to 60 percent, and the solid content is more than 45 percent;
the acrylic emulsion is mainly formed by polymerizing acrylic ester monomer emulsion and styrene monomer emulsion, wherein the solid content of the acrylic emulsion is 40-50%, and the glass transition temperature is 50-60 ℃.
The inorganic pigment of the waterborne hot-melt PVDF fluorocarbon coating mainly comprises rutile titanium dioxide and high-temperature resistant inorganic ceramic pigment.
The film-forming cosolvent of the waterborne hot-melt PVDF fluorocarbon coating comprises one or more than two of propylene glycol methyl ether, ethylene glycol butyl ether, dipropylene glycol methyl ether, dipropylene glycol butyl ether, tripropylene glycol butyl ether or K-Flex 850S.
The water-based hot-melt PVDF fluorocarbon coating also comprises an anti-settling rheological agent, a defoaming agent, a wetting agent and a thickening rheological agent.
A preparation method of a water-based hot-melt PVDF fluorocarbon coating comprises the following steps:
(1) adding deionized water in a cylinder in a metering manner, adding an anti-settling rheological agent, a defoaming agent, a wetting agent and an inorganic pigment in a stirring state, and uniformly dispersing at a high speed;
(2) grinding with sand mill to fineness less than 15 μm;
(3) adding film forming matter, film forming cosolvent and thickening rheological agent;
(4) filtering and packaging to obtain the product.
The application of the water-based hot-melt PVDF fluorocarbon coating in aluminum alloy or metal substrates.
Compared with the prior art, the water-based hot-melt PVDF fluorocarbon coating provided by the invention achieves the following technical effects: 1. the coating can be used for replacing solvent type hot-melt PVDF fluorocarbon coating, has the advantages of energy conservation, consumption reduction, environmental protection and emission reduction, and accords with the long-term planning policy of national energy conservation, emission reduction and environmental protection; 2. the high-performance water-based hot-melt PVDF fluorocarbon coating which is prepared from polyvinylidene fluoride emulsion/acrylic emulsion as a film forming substance and high-temperature-resistant inorganic pigment, a film forming cosolvent, deionized water and the like has excellent chemical resistance and weather resistance, and each index is equivalent to the performance of a solvent type coating; 3. the inorganic pigment adopts rutile titanium dioxide, high-temperature resistant inorganic pigment and the like, so that excellent durability and color fastness during high-temperature curing are ensured; 4. deionized water is used for formula dilution and construction to reduce viscosity; 5. does not contain phthalate plasticizers such as DMP and the like; 6. the curing temperature may be equal to or as low as 200 ℃ curing; 7. the VOC content in the water-based hot-melt PVDF fluorocarbon coating is less than or equal to 60 g/L; 8. the performance of the water-based hot-melt PVDF fluorocarbon coating can reach or exceed the standard requirements of < HG/T3793-2005> or American < AAMA-2605> of the solvent hot-melt PVDF fluorocarbon coating: the nitric acid resistance is more than or equal to 30min, the accelerated weather resistance test reaches or exceeds 4000 hours, and the humidity resistance, heat resistance and neutral salt spray resistance reach or exceeds 4000 hours.
The following detailed description of the embodiments of the present invention is provided in connection with the examples to facilitate understanding and understanding of the technical solutions.
Detailed Description
The process of the present invention is illustrated below by means of specific examples, but the present invention is not limited thereto. The experimental methods described in the following examples are all conventional methods unless otherwise specified; the reagents and materials are commercially available without specific reference, and the following examples are not intended to limit the scope of the present invention, and all equivalent implementations or modifications without departing from the scope of the present invention are intended to be included in the scope of the present invention.
Embodiment 1 aqueous hot-melt type PVDF fluorocarbon coating and preparation method thereof
42g of polyvinylidene fluoride emulsion, 18g of acrylic emulsion, 12g of rutile titanium dioxide, 10g of high-temperature-resistant inorganic ceramic pigment, 5g of dipropylene glycol butyl ether, 11.4g of deionized water, 0.2g of anti-settling rheological agent, 0.3g of defoaming agent, 0.5g of wetting agent and 0.6g of thickening rheological agent;
the polyvinylidene fluoride emulsion is formed by polymerizing polyvinylidene fluoride under a high-pressure state, the fluorine content of the polyvinylidene fluoride emulsion is more than or equal to 60 percent, and the solid content of the polyvinylidene fluoride emulsion is more than 45 percent; the acrylic emulsion is mainly formed by polymerizing acrylic ester monomer emulsion and styrene monomer emulsion, wherein the solid content of the acrylic emulsion is 40-50%, and the glass transition temperature is 50-60 ℃.
The preparation method of the water-based hot-melt PVDF fluorocarbon coating comprises the following steps:
(1) 11.4g of deionized water is metered into a cylinder, 0.2g of anti-settling rheological agent, 0.3g of defoaming agent, 0.5g of wetting agent, 12g of rutile titanium dioxide and 10g of high-temperature resistant inorganic ceramic pigment are added under the stirring state, and the materials are uniformly dispersed at a high speed;
(2) grinding with sand mill to fineness less than 15 μm;
(3) supplementing 42g of polyvinylidene fluoride emulsion, 18g of acrylic emulsion, 5g of dipropylene glycol butyl ether and 0.6g of thickening rheological agent;
(4) filtering and packaging to obtain the product.
Embodiment 2 aqueous hot-melt type PVDF fluorocarbon coating and preparation method thereof
44.8g of polyvinylidene fluoride emulsion, 19.2g of acrylic emulsion, 3g of rutile titanium dioxide, 16g of high-temperature-resistant inorganic ceramic pigment, 2g of dipropylene glycol methyl ether, 3g of dipropylene glycol butyl ether, 10.4g of deionized water, 0.2g of anti-settling rheological agent, 0.3g of defoaming agent, 0.5g of wetting agent and 0.6g of thickening rheological agent;
the polyvinylidene fluoride emulsion is formed by polymerizing polyvinylidene fluoride under a high-pressure state, the fluorine content of the polyvinylidene fluoride emulsion is more than or equal to 60 percent, and the solid content of the polyvinylidene fluoride emulsion is more than 45 percent; the acrylic emulsion is mainly formed by polymerizing acrylic ester monomer emulsion and styrene monomer emulsion, wherein the solid content of the acrylic emulsion is 40-50%, and the glass transition temperature is 50-60 ℃.
The preparation method of the water-based hot-melt PVDF fluorocarbon coating comprises the following steps:
(1) 10.4g of deionized water is metered into a cylinder, 0.2g of anti-settling rheological agent, 0.3g of defoaming agent, 0.5g of wetting agent, 3g of rutile titanium dioxide and 16g of high-temperature resistant inorganic ceramic pigment are added under the stirring state, and the materials are uniformly dispersed at a high speed;
(2) grinding with sand mill to fineness less than 15 μm;
(3) supplementing 44.8g of polyvinylidene fluoride emulsion, 19.2g of acrylic emulsion, 2g of dipropylene glycol methyl ether, 3g of dipropylene glycol butyl ether and 0.6g of thickening rheological agent;
(4) filtering and packaging to obtain the product.
Embodiment 3 aqueous hot-melt type PVDF fluorocarbon coating and preparation method thereof
39.9g of polyvinylidene fluoride emulsion, 17.1g of acrylic emulsion, 17g of rutile titanium dioxide, 4g of high-temperature resistant inorganic ceramic pigment, 1g of propylene glycol methyl ether, 1g of ethylene glycol butyl ether, 3g of dipropylene glycol butyl ether, 15.2g of deionized water, 0.2g of anti-settling rheological agent, 0.3g of defoaming agent, 0.5g of wetting agent and 0.8g of thickening rheological agent;
the polyvinylidene fluoride emulsion is formed by polymerizing polyvinylidene fluoride under a high-pressure state, the fluorine content of the polyvinylidene fluoride emulsion is more than or equal to 60 percent, and the solid content of the polyvinylidene fluoride emulsion is more than 45 percent; the acrylic emulsion is mainly formed by polymerizing acrylic ester monomer emulsion and styrene monomer emulsion, wherein the solid content of the acrylic emulsion is 40-50%, and the glass transition temperature is 50-60 ℃.
The preparation method of the water-based hot-melt PVDF fluorocarbon coating comprises the following steps:
(1) 15.2g of deionized water is added into a cylinder in a metering way, 0.2g of anti-settling rheological agent, 0.3g of defoaming agent, 0.5g of wetting agent, 17g of rutile titanium dioxide and 4g of high-temperature resistant inorganic ceramic pigment are added under the stirring state, and the materials are uniformly dispersed at a high speed;
(2) grinding with sand mill to fineness less than 15 μm;
(3) supplementing 39.9g of polyvinylidene fluoride emulsion, 17.1g of acrylic emulsion, 1g of propylene glycol methyl ether, 1g of ethylene glycol butyl ether, 3g of dipropylene glycol butyl ether and 0.8g of thickening rheological agent;
(4) filtering and packaging to obtain the product.
Example 4 construction Process of Water-based fluorocarbon coating
Diluting the water-based hot-melt PVDF fluorocarbon coating prepared in the embodiment 1 to 25-30S/4 cups by using deionized water, and spraying the diluted coating on the surface of the aluminum alloy by using a spray gun, wherein the film thickness is 25-30 microns; leveling at normal temperature for about 5min after spraying, flashing at 80 ℃ for 5min, and curing at 200 ℃ for 10-15 min.
Example 5 construction Process of Water-based fluorocarbon coating
Diluting the water-based hot-melt PVDF fluorocarbon coating prepared in the example 1 to 25-30S/4 cup with deionized water, and spraying the diluted coating on the surface of a metal substrate by a spray gun, wherein the thickness of the coating is 25-30 microns; leveling at normal temperature for about 5min after spraying, flashing at 80 ℃ for 5min, and curing at 200 ℃ for 10-15 min.
Example 6 Performance testing of aqueous Hot melt PVDF fluorocarbon coatings
Various indexes of the water-based hot-melt PVDF fluorocarbon coating reach or exceed the performance of the solvent hot-melt PVDF fluorocarbon coating,
the VOC of the water-based hot-melt PVDF fluorocarbon coating is less than or equal to 60g/L, and the curing temperature can be as low as 200 ℃ for curing.
The performance of the water-based hot-melt PVDF fluorocarbon coating reaches or exceeds the standard requirements of < HG/T3793-2005> or < AAMA-2605> in the United states of America of the solvent hot-melt PVDF fluorocarbon coating: the nitric acid resistance is more than or equal to 30min, the accelerated weather resistance test reaches or exceeds 4000 hours, and the humidity resistance, heat resistance and neutral salt spray resistance reach or exceeds 4000 hours.
The foregoing description shows and describes several preferred embodiments of the invention, but as aforementioned, it is to be understood that the invention is not limited to the forms disclosed herein, but is not to be construed as excluding other embodiments and is capable of use in various other combinations, modifications, and environments and is capable of changes within the scope of the inventive concept as expressed herein, commensurate with the above teachings, or the skill or knowledge of the relevant art. And that modifications and variations may be effected by those skilled in the art without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (7)
1. A water-based hot-melt PVDF fluorocarbon coating is characterized by comprising a film-forming substance, an inorganic pigment, a film-forming cosolvent and deionized water,
wherein, the film forming material comprises the following components in percentage by weight: inorganic pigment: film-forming cosolvent: 50-70% of deionized water: 15-25%: 5-10%: 5 to 20 percent;
the film forming material comprises polyvinylidene fluoride emulsion and acrylic emulsion, wherein the polyvinylidene fluoride emulsion comprises the following components in percentage by weight: the acrylic emulsion is 7: 3;
the fluorine content of the polyvinylidene fluoride emulsion is more than or equal to 60 percent, and the solid content is more than 45 percent;
the acrylic emulsion is mainly formed by polymerizing acrylic ester monomer emulsion and styrene monomer emulsion, wherein the solid content of the acrylic emulsion is 40-50%, and the glass transition temperature is 50-60 ℃;
the application of the water-based hot-melt PVDF fluorocarbon coating in aluminum alloy.
2. The water-based hot-melt PVDF fluorocarbon coating as claimed in claim 1, wherein the weight percentage of the film-forming substance is as follows: inorganic pigment: film-forming cosolvent: the deionized water is 55-68%: 17-24%: 5-8%: 8 to 18 percent.
3. The water-based hot-melt PVDF fluorocarbon coating as claimed in claim 1, wherein the weight percentage of the film-forming substance is as follows: inorganic pigment: film-forming cosolvent: 58-65% of deionized water: 19-22%: 5-6%: 10 to 16 percent.
4. The aqueous hot melt PVDF fluorocarbon coating of claim 1, wherein the inorganic pigments consist essentially of rutile titanium dioxide and high temperature resistant inorganic ceramic pigments.
5. The waterborne hot melt PVDF fluorocarbon coating of claim 1, wherein the film forming cosolvent comprises one or more of propylene glycol methyl ether, ethylene glycol butyl ether, dipropylene glycol methyl ether, dipropylene glycol butyl ether, tripropylene glycol butyl ether, or K-Flex 850S.
6. The aqueous hot melt PVDF fluorocarbon coating of claim 1, further comprising an anti-settling rheology agent, a defoamer, a wetting agent, a thickening rheology agent.
7. A method for preparing the water-based hot-melt PVDF fluorocarbon coating as defined in any one of claims 1-6, comprising the following steps:
(1) adding deionized water in a cylinder in a metering manner, adding an anti-settling rheological agent, a defoaming agent, a wetting agent and an inorganic pigment in a stirring state, and uniformly dispersing at a high speed;
(2) grinding with sand mill to fineness less than 15 μm;
(3) adding film forming matter, film forming cosolvent and thickening rheological agent;
(4) filtering and packaging to obtain the product.
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| CN112980257A (en) * | 2021-03-24 | 2021-06-18 | 珠海市氟特科技有限公司 | Water-based normal-temperature self-drying PVDF (polyvinylidene fluoride) coating as well as preparation method and application thereof |
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