CN110183919B - Aqueous coating liquid for high-weather-resistance and heat and humidity-resistance polyester film and preparation method thereof - Google Patents

Aqueous coating liquid for high-weather-resistance and heat and humidity-resistance polyester film and preparation method thereof Download PDF

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CN110183919B
CN110183919B CN201910524514.XA CN201910524514A CN110183919B CN 110183919 B CN110183919 B CN 110183919B CN 201910524514 A CN201910524514 A CN 201910524514A CN 110183919 B CN110183919 B CN 110183919B
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acrylic resin
coating liquid
polyester film
resistant
deionized water
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CN110183919A (en
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秦志凤
王猛
胡蓓
蒙钊
胡婧
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JIANGSU YUXING FILM TECHNOLOGY CO LTD
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JIANGSU YUXING FILM TECHNOLOGY CO LTD
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    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J7/00—Chemical treatment or coating of shaped articles made of macromolecular substances
    • C08J7/04—Coating
    • C08J7/0427—Coating with only one layer of a composition containing a polymer binder
    • 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
    • C09D133/04—Homopolymers or copolymers of esters
    • 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
    • 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
    • C09D7/63—Additives non-macromolecular organic
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2367/00—Characterised by the use of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Derivatives of such polymers
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2433/00—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Derivatives of such polymers
    • 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
    • C08K3/20—Oxides; Hydroxides
    • C08K3/22—Oxides; Hydroxides of metals
    • C08K2003/2237—Oxides; Hydroxides of metals of titanium
    • C08K2003/2241—Titanium dioxide
    • 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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Abstract

The invention belongs to the technical field of off-line coating of polyester films, and particularly relates to a high-weather-resistance and heat and humidity resistant aqueous coating liquid for a polyester film and a preparation method thereof, wherein the aqueous coating liquid comprises the following components in percentage by weight: 24-32% of main resin, 4-8% of curing agent, 1.5-3.0% of wetting dispersant, 0.8-2.5% of flatting agent, 15-20% of ultraviolet absorbent and the balance of deionized water. The polyester modified acrylic resin has good flexibility and very low shrinkage rate, has good adhesive force on plastics, and the thermoplastic acrylic resin has good weather resistance, light and color retention, water resistance and acid and alkali resistance.

Description

Aqueous coating liquid for high-weather-resistance and heat and humidity-resistance polyester film and preparation method thereof
Technical Field
The invention belongs to the technical field of off-line coating of polyester films, and particularly relates to a high-weather-resistance and heat and humidity resistant aqueous coating liquid for a polyester film and a preparation method thereof.
Background
Polyester films are widely used in photovoltaic and outdoor printing and advertising industries due to excellent physical and mechanical properties and good insulating properties. The harsh environmental requirements provide a severe challenge to the weather resistance and the like of the polyester film, the requirements of long-term outdoor use can be met, and in order to endow the polyester film with good weather resistance and enable the polyester film to adapt to severe and variable environmental changes, the requirements of weather resistance and the like are realized by coating a layer of fluorocarbon resin or solvent-type non-fluorocarbon resin on the surface of the polyester film in the current industry.
However, fluorocarbon resin or non-fluorocarbon solvent-based resin coating liquid belongs to a non-environment-friendly material, and a large amount of solvent is volatilized in the coating liquid preparation process and the coating process, so that harmful substances to the environment are generated, the human health is harmed, and the long-term continuous development is not facilitated.
Disclosure of Invention
In order to endow the polyester film with good performance and reduce the harm to the environment, the invention discloses an aqueous coating liquid for a high-weather-resistance and humidity-heat-resistance polyester film and a preparation method thereof.
In order to achieve the purpose, the invention adopts the following technical scheme:
an aqueous coating liquid for a high weather-resistant and damp-heat resistant polyester film comprises the following components in percentage by weight:
Figure BDA0002097742290000011
preferably, the host resin is a mixture of a polyester-modified acrylic resin and a thermoplastic acrylic resin.
Preferably, the mass ratio of the polyester-modified acrylic resin to the thermoplastic acrylic resin is 3: 1.
Preferably, the curing agent is a blocked polyisocyanate.
Preferably, the wetting and dispersing agent is one or two of DISPERBYK-180 and DISPERBYK-184.
Preferably, the leveling agent is one or two of TEGO Glide 410 and TEGO Glide 482.
Preferably, the ultraviolet absorber is rutile TiO2。
A preparation method of an aqueous coating liquid for a high-weather-resistance and humidity-heat-resistance polyester film comprises the following steps:
(1) firstly, 1/2, an ultraviolet absorbent and a wetting dispersant which are contained in the polyester modified acrylic resin formula are respectively diluted by deionized water, and then are mixed and stirred for 30 min;
(2) grinding and dispersing the mixture by a ball mill until the particle size is less than 8 mu m;
(3) after grinding, slowly adding the rest of the polyester modified acrylic resin, the rest of the thermoplastic acrylic resin and the rest of the leveling agent respectively, and continuously stirring for 30 min;
(4) slowly adding the blocked polyisocyanate, adding the rest deionized water, and continuously stirring for 1h to obtain the product.
The invention has the following beneficial effects: (1) the polyester modified acrylic resin has good flexibility and very low shrinkage rate, has good adhesive force on plastics, and the thermoplastic acrylic resin has good weather resistance, light and color retention, water resistance and acid and alkali resistance;
(2) the mass ratio of the polyester modified acrylic resin to the thermoplastic acrylic resin is controlled to be 3:1, high weather resistance, high humidity resistance and the like can be obtained while ensuring high adhesive force and low volume shrinkage;
(3) the ultraviolet absorbent added in the application is rutile titanium dioxide, can effectively absorb ultraviolet rays, improves the weather resistance of the polyester film, expands the application of the polyester film in the photovoltaic field, and is also beneficial to reducing the volume shrinkage rate;
(4) the coating liquid of the invention takes water as a solvent, does not contain VOC and other environmentally unfriendly components, and is beneficial to environmental protection.
Detailed Description
The present invention will now be described in further detail with reference to examples.
In the step (1), 1/2, an ultraviolet absorbent and a wetting dispersant which are contained in the polyester modified acrylic resin are respectively diluted by deionized water, and then mixed and stirred for 30min, wherein the deionized water is used for diluting the components so as to facilitate the components to be easily mixed, and the used deionized water is proper; the "slow addition" in step (3) is to facilitate the uniform mixing of the components, and the skilled person will understand how the slow addition in step (3) should be; the "slow addition of blocked polyisocyanate" in step (4) is to prevent blocked polyisocyanate from being added too quickly and causing the system to cure rapidly, and therefore needs to be added slowly, and the skilled person will also understand how slowly in step (4) should be.
Example 1
Raw materials: 18% of polyester modified acrylic resin, 6% of thermoplastic acrylic resin, 4% of blocked polyisocyanate, DISPERBYK-1801.8%, TEGO Glide 4102.5%, and rutile TiO220 percent and the balance of deionized water.
The preparation method comprises the following steps:
(1) 1/2 and rutile TiO in the content of polyester modified acrylic resin formula2Respectively diluting DISPERBYK-180 with deionized water, and mixing and stirring for 30 min;
(2) grinding and dispersing for 2h by using a ball mill, and uniformly mixing;
(3) after grinding, slowly adding the rest of polyester modified acrylic resin, thermoplastic acrylic resin and TEGO Glide 410 respectively, and continuously stirring for 30 min;
(4) slowly adding the blocked polyisocyanate, adding the rest deionized water, and continuously stirring for 1h to obtain the product.
The coating liquid is uniformly coated on the surface of the polyester film through a slit coating head, and a coating layer with the thickness of 10 mu m can be obtained after drying and curing.
Example 2
Raw materials: 20% of polyester modified acrylic resin, 6.67% of thermoplastic acrylic resin, 5.5% of blocked polyisocyanate, DISPERBYK-1802%, DISPERBYK-1840.2%, TEGO Glide 4821%, and rutile TiO215 percent and the balance of deionized water.
The preparation method comprises the following steps:
(1) 1/2 and rutile TiO in the content of polyester modified acrylic resin formula2、DISPERBYKRespectively diluting 180 parts of DisPERBYK-184 with deionized water, and mixing and stirring for 30 min;
(2) grinding and dispersing for 2h by using a ball mill, and uniformly mixing;
(3) after grinding, slowly adding the rest of polyester modified acrylic resin, thermoplastic acrylic resin and TEGO Glide 482 respectively, and continuously stirring for 30 min;
(4) slowly adding the blocked polyisocyanate, adding the rest deionized water, and continuously stirring for 1h to obtain the product.
The coating liquid is uniformly coated on the surface of the polyester film through a slit coating head, and a coating layer with the thickness of 13 mu m can be obtained after drying and curing.
Example 3
Raw materials: 21% of polyester modified acrylic resin, 7% of thermoplastic acrylic resin, 6% of blocked polyisocyanate, DISPERBYK-1842.1%, TEGO Glide 4101.0%, TEGO Glide 4820.4%, and rutile TiO218 percent and the balance of deionized water.
The preparation method comprises the following steps:
(1) 1/2 and rutile TiO in the content of polyester modified acrylic resin formula2Respectively diluting DISPERBYK-184 with deionized water, and mixing and stirring for 30 min;
(2) grinding and dispersing for 2h by using a ball mill, and uniformly mixing;
(3) after grinding, slowly adding the rest of polyester modified acrylic resin, thermoplastic acrylic resin, TEGO Glide 410 and TEGO Glide 482 respectively, and continuously stirring for 30 min;
(4) slowly adding the blocked polyisocyanate, adding the rest deionized water, and continuously stirring for 1h to obtain the product.
The coating liquid is uniformly coated on the surface of the polyester film through a slit coating head, and a coating layer with the thickness of 15 microns can be obtained after drying and curing.
Example 4
Raw materials: 22% of polyester modified acrylic resin, 7.33% of thermoplastic acrylic resin, 6.4% of blocked polyisocyanate, DISPERBYK-1803.0%, TEGO Glide 4102.3%, and rutile TiO220% ofThe balance of ionized water.
The preparation method comprises the following steps:
(1) 1/2 and rutile TiO in the content of polyester modified acrylic resin formula2Respectively diluting DISPERBYK-180 with deionized water, and mixing and stirring for 30 min;
(2) grinding and dispersing for 2h by using a ball mill, and uniformly mixing;
(3) after grinding, slowly adding the rest of polyester modified acrylic resin, thermoplastic acrylic resin and TEGO Glide 410 respectively, and continuously stirring for 30 min;
(4) slowly adding the blocked polyisocyanate, adding the rest deionized water, and continuously stirring for 1h to obtain the product.
The coating liquid is uniformly coated on the surface of the polyester film through a slit coating head, and a coating layer with the thickness of 20 microns can be obtained after drying and curing.
Example 5
Raw materials: 23% of polyester modified acrylic resin, 7.67% of thermoplastic acrylic resin, 7% of blocked polyisocyanate, DISPERBYK-1842.2%, TEGO Glide 4821.8%, and rutile TiO216 percent and the balance of deionized water.
The preparation method comprises the following steps:
(1) 1/2 and rutile TiO in the content of polyester modified acrylic resin formula2Respectively diluting DISPERBYK-184 with deionized water, and mixing and stirring for 30 min;
(2) grinding and dispersing for 2h by using a ball mill, and uniformly mixing;
(3) after grinding, slowly adding the rest of polyester modified acrylic resin, thermoplastic acrylic resin and TEGO Glide 482 respectively, and continuously stirring for 30 min;
(4) slowly adding the blocked polyisocyanate, adding the rest deionized water, and continuously stirring for 1h to obtain the product.
The coating liquid is uniformly coated on the surface of the polyester film through a slit coating head, and a coating layer with the thickness of 22 mu m can be obtained after drying and curing.
Example 6
Raw materials: 24% of polyester modified acrylic resin and thermoplastic8% of acrylic resin, 8% of blocked polyisocyanate, 8% of DISPERBYK-1801.5%, TEGO Glide 4100.8%, and rutile TiO215 percent and the balance of deionized water.
The preparation method comprises the following steps:
(1) 1/2 and rutile TiO in the content of polyester modified acrylic resin formula2Respectively diluting DISPERBYK-180 with deionized water, and mixing and stirring for 30 min;
(2) grinding and dispersing for 2h by using a ball mill, and uniformly mixing;
(3) after grinding, slowly adding the rest of polyester modified acrylic resin, thermoplastic acrylic resin and TEGO Glide 410 respectively, and continuously stirring for 30 min;
(4) slowly adding the blocked polyisocyanate, adding the rest deionized water, and continuously stirring for 1h to obtain the product.
The coating liquid is uniformly coated on the surface of the polyester film through a slit coating head, and a coating layer with the thickness of 25 mu m can be obtained after drying and curing.
Comparative example 1
Raw materials: 15% of polyester modified acrylic resin, 5% of thermoplastic acrylic resin, 4% of blocked polyisocyanate, DISPERBYK-1841.5%, TEGO Glide 4103.5%, and rutile TiO225% and the balance of deionized water.
The preparation method comprises the following steps:
(1) 1/2 and rutile TiO in the content of polyester modified acrylic resin formula2Respectively diluting DISPERBYK-184 with deionized water, and mixing and stirring for 30 min;
(2) grinding and dispersing for 2h by using a ball mill, and uniformly mixing;
(3) after grinding, slowly adding the rest of polyester modified acrylic resin, thermoplastic acrylic resin and TEGO Glide 410 respectively, and continuously stirring for 30 min;
(4) slowly adding the blocked polyisocyanate, adding the rest deionized water, and continuously stirring for 1h to obtain the product.
The coating liquid is uniformly coated on the surface of the polyester film through a slit coating head, and a coating layer with the thickness of 10 mu m can be obtained after drying and curing.
Comparative example 2
Raw materials: 21% of polyester modified acrylic resin, 7% of thermoplastic acrylic resin, 5% of blocked polyisocyanate, DISPERBYK-1800.7%, and rutile TiO220 percent and the balance of deionized water.
The preparation method comprises the following steps:
(1) 1/2 and rutile TiO in the content of polyester modified acrylic resin formula2Respectively diluting DISPERBYK-180 with deionized water, and mixing and stirring for 30 min;
(2) grinding and dispersing for 2h by using a ball mill, and uniformly mixing;
(3) after grinding, slowly adding the rest of the polyester modified acrylic resin and the rest of the thermoplastic acrylic resin respectively, and continuously stirring for 30 min;
(4) slowly adding the blocked polyisocyanate, adding the rest deionized water, and continuously stirring for 1h to obtain the product.
The coating liquid is uniformly coated on the surface of the polyester film through a slit coating head, and a coating layer with the thickness of 15 microns can be obtained after drying and curing.
Comparative example 3
Raw materials: 24% of polyester modified acrylic resin, 8% of thermoplastic acrylic resin, 7% of blocked polyisocyanate, DISPERBYK-1802%, TEGO Glide 4101.5%, and rutile TiO215 percent and the balance of deionized water.
The preparation method comprises the following steps:
(1) 1/2 and rutile TiO in the content of polyester modified acrylic resin formula2Respectively diluting DISPERBYK-180 with deionized water, and mixing and stirring for 30 min;
(2) grinding and dispersing for 2h by using a ball mill, and uniformly mixing;
(3) after grinding, slowly adding the rest of polyester modified acrylic resin, thermoplastic acrylic resin and TEGO Glide 410 respectively, and continuously stirring for 30 min;
(4) slowly adding the blocked polyisocyanate, adding the rest deionized water, and continuously stirring for 1h to obtain the product.
The coating liquid is uniformly coated on the surface of the polyester film through a slit coating head, and a coating layer with the thickness of 19 microns can be obtained after drying and curing.
Comparative example 4
Raw materials: 25% of polyester modified acrylic resin, 8.33% of thermoplastic acrylic resin, 8.5% of blocked polyisocyanate, TEGO Glide 4821.7%, and rutile TiO216 percent and the balance of deionized water.
The preparation method comprises the following steps:
(1) 1/2 and rutile TiO in the content of polyester modified acrylic resin formula2Diluting with deionized water, mixing and stirring for 30 min;
(2) grinding and dispersing for 2h by using a ball mill, and uniformly mixing;
(3) after grinding, slowly adding the rest of polyester modified acrylic resin, thermoplastic acrylic resin and TEGO Glide 482 respectively, and continuously stirring for 30 min;
(4) slowly adding the blocked polyisocyanate, adding the rest deionized water, and continuously stirring for 1h to obtain the product.
The coating liquid is uniformly coated on the surface of the polyester film through a slit coating head, and a coating layer with the thickness of 26 microns can be obtained after drying and curing.
Comparative example 5
Raw materials: 29.33% of polyester modified acrylic resin, 6.4% of blocked polyisocyanate, DISPERBYK-1803.0%, TEGO Glide 4102.3%, and rutile TiO220 percent and the balance of deionized water.
The preparation method comprises the following steps:
(1) 1/2 and rutile TiO in the content of polyester modified acrylic resin formula2Respectively diluting DISPERBYK-180 with deionized water, and mixing and stirring for 30 min;
(2) grinding and dispersing for 2h by using a ball mill, and uniformly mixing;
(3) after grinding, slowly adding the rest of polyester modified acrylic resin and TEGO Glide 410 respectively, and continuously stirring for 30 min;
(4) slowly adding the blocked polyisocyanate, adding the rest deionized water, and continuously stirring for 1h to obtain the product.
And (3) uniformly coating the coating liquid on the surface of the polyester film through a slit coating head, and drying and curing to obtain a coating with the thickness of 20 microns.
Comparative example 6
Raw materials: 29.33% of thermoplastic acrylic resin, 6.4% of blocked polyisocyanate, DISPERBYK-1803.0%, TEGO Glide 4102.3%, and rutile TiO220 percent and the balance of deionized water.
The preparation method comprises the following steps:
(1) firstly, 1/2 rutile type TiO with the formula content of thermoplastic acrylic resin2Respectively diluting DISPERBYK-180 with deionized water, and mixing and stirring for 30 min;
(2) grinding and dispersing for 2h by using a ball mill, and uniformly mixing;
(3) after grinding, slowly adding the rest of thermoplastic acrylic resin and TEGO Glide 410 respectively, and continuously stirring for 30 min;
(4) slowly adding the blocked polyisocyanate, adding the rest deionized water, and continuously stirring for 1h to obtain the product.
And (3) uniformly coating the coating liquid on the surface of the polyester film through a slit coating head, and drying and curing to obtain a coating with the thickness of 20 microns.
Comparative example 7
Raw materials: 20% of polyester modified acrylic resin, 9.33% of thermoplastic acrylic resin, 6.4% of blocked polyisocyanate, DISPERBYK-1803.0%, TEGO Glide 4102.3%, and rutile TiO220 percent and the balance of deionized water.
The preparation method comprises the following steps:
the preparation method comprises the following steps:
(1) 1/2 and rutile TiO in the content of polyester modified acrylic resin formula2Respectively diluting DISPERBYK-180 with deionized water, and mixing and stirring for 30 min;
(2) grinding and dispersing for 2h by using a ball mill, and uniformly mixing;
(3) after grinding, slowly adding the rest of polyester modified acrylic resin, thermoplastic acrylic resin and TEGO Glide 410 respectively, and continuously stirring for 30 min;
(4) slowly adding the blocked polyisocyanate, adding the rest deionized water, and continuously stirring for 1h to obtain the product.
And (3) uniformly coating the coating liquid on the surface of the polyester film through a slit coating head, and drying and curing to obtain a coating with the thickness of 20 microns.
Comparative example 8
Raw materials: 24% of polyester modified acrylic resin, 5.33% of thermoplastic acrylic resin, 6.4% of blocked polyisocyanate, DISPERBYK-1803.0%, TEGO Glide 4102.3%, and rutile TiO220 percent and the balance of deionized water.
The preparation method comprises the following steps:
(1) 1/2 and rutile TiO in the content of polyester modified acrylic resin formula2Respectively diluting DISPERBYK-180 with deionized water, and mixing and stirring for 30 min;
(2) grinding and dispersing for 2h by using a ball mill, and uniformly mixing;
(3) after grinding, slowly adding the rest of polyester modified acrylic resin, thermoplastic acrylic resin and TEGO Glide 410 respectively, and continuously stirring for 30 min;
(4) slowly adding the blocked polyisocyanate, adding the rest deionized water, and continuously stirring for 1h to obtain the product.
And (3) uniformly coating the coating liquid on the surface of the polyester film through a slit coating head, and drying and curing to obtain a coating with the thickness of 20 microns.
Comparative example 9
Raw materials: 22% of polyester modified acrylic resin, 7.33% of thermoplastic acrylic resin, 6.4% of blocked polyisocyanate, DISPERBYK-1803.0%, TEGO Glide 4102.3% and the balance of deionized water.
The preparation method comprises the following steps:
(1) 1/2 and DISPERBYK-180 in the formula content of the polyester modified acrylic resin are respectively diluted by deionized water and then mixed and stirred for 30 min;
(2) grinding and dispersing for 2h by using a ball mill, and uniformly mixing;
(3) after grinding, slowly adding the rest of polyester modified acrylic resin, thermoplastic acrylic resin and TEGO Glide 410 respectively, and continuously stirring for 30 min;
(4) slowly adding the blocked polyisocyanate, adding the rest deionized water, and continuously stirring for 1h to obtain the product.
The coating liquid is uniformly coated on the surface of the polyester film through a slit coating head, and a coating layer with the thickness of 17 mu m can be obtained after drying and curing.
Comparative example 10 is a commercially available fluorocarbon coated polyester film a.
Comparative example 11 is a commercially available fluorocarbon-coated polyester film B.
Comparative example 12 is a commercially available fluorocarbon coated polyester film C.
The coatings obtained in examples 1-6 and comparative examples 1-12 were tested for their performance according to the relevant entries in GB/T31034-2014, the results of which are shown in Table 1.
TABLE 1
Adhesion (grade) Weather resistance (kWh. m)-2) Moisture and Heat resistance (h)
Example 1 0 120 2800
Example 2 0 100 2700
Example 3 0 90 3200
Example 4 0 120 3500
Example 5 0 100 2600
Example 6 0 80 2900
Comparative example 1 1 45 800
Comparative example 2 2 15 500
Comparative example 3 0 60 800
Comparative example 4 1 30 1200
Comparative example 5 0 5 500
Comparative example 6 3 80 800
Comparative example 7 1 60 1800
Comparative example 8 0 45 1500
Comparative example 9 0 5 2800
Comparative example 10 0 30 1300
Comparative example 11 0 60 3000
Comparative example 12 0 45 2200
In light of the foregoing description of the preferred embodiment of the present invention, many modifications and variations will be apparent to those skilled in the art without departing from the spirit and scope of the invention. The technical scope of the present invention is not limited to the content of the specification, and must be determined according to the scope of the claims.

Claims (6)

1. An aqueous coating liquid for a high weather-resistant and heat and humidity resistant polyester film, which is characterized in that: the composition comprises the following components in percentage by weight:
24-32% of main body resin
4 to 8 percent of curing agent
1.5 to 3.0 percent of wetting dispersant
0.8 to 2.5 percent of flatting agent
15 to 20 percent of ultraviolet absorbent
The balance of deionized water;
the main resin is a mixture of polyester modified acrylic resin and thermoplastic acrylic resin;
the mass ratio of the polyester modified acrylic resin to the thermoplastic acrylic resin is 3: 1.
2. The aqueous coating liquid for highly weather-resistant and moisture-and-heat-resistant polyester film according to claim 1, wherein: the curing agent is blocked polyisocyanate.
3. The aqueous coating liquid for highly weather-resistant and moisture-and-heat-resistant polyester film according to claim 1, wherein: the wetting dispersant is one or two of DISPERBYK-180 and DISPERBYK-184.
4. The aqueous coating liquid for highly weather-resistant and moisture-and-heat-resistant polyester film according to claim 1, wherein: the leveling agent is one or two of TEGO Glide 410 and TEGO Glide 482.
5. The aqueous coating liquid for highly weather-resistant and moisture-and-heat-resistant polyester film according to claim 1, wherein: the ultraviolet absorbent is rutile TiO 2.
6. A method for preparing the aqueous coating liquid for the highly weather-resistant and heat and humidity resistant polyester film as claimed in any one of claims 1 to 5, wherein: the method comprises the following steps:
(1) firstly, 1/2, an ultraviolet absorbent and a wetting dispersant which are contained in the polyester modified acrylic resin formula are respectively diluted by deionized water, and then are mixed and stirred for 30 min;
(2) grinding and dispersing the mixture by a ball mill until the particle size is less than 8 mu m;
(3) after grinding, slowly adding the rest of the polyester modified acrylic resin, the rest of the thermoplastic acrylic resin and the rest of the leveling agent respectively, and continuously stirring for 30 min;
(4) slowly adding the blocked polyisocyanate, adding the rest deionized water, and continuously stirring for 1h to obtain the product.
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CN103320006A (en) * 2013-07-17 2013-09-25 北京国泰瑞华精藻硅特种材料有限公司 High speed train body surface matching middle and top coating
CN104513583A (en) * 2013-09-28 2015-04-15 江苏锋华车辆科技有限公司 Automotive topcoat
CN105949984A (en) * 2016-05-24 2016-09-21 江苏裕兴薄膜科技股份有限公司 Universal online coating liquid for polyester films and method for manufacturing universal online coating liquid
CN106609104A (en) * 2015-10-27 2017-05-03 丹阳市海信涂料化工厂 Waterborne sun protection and heat insulation coating

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Publication number Priority date Publication date Assignee Title
CN101081957A (en) * 2007-06-26 2007-12-05 广东雅图化工有限公司 Automobile finishing varnish containing water dispersible acrylic ester and preparation method thereof
CN103320006A (en) * 2013-07-17 2013-09-25 北京国泰瑞华精藻硅特种材料有限公司 High speed train body surface matching middle and top coating
CN104513583A (en) * 2013-09-28 2015-04-15 江苏锋华车辆科技有限公司 Automotive topcoat
CN106609104A (en) * 2015-10-27 2017-05-03 丹阳市海信涂料化工厂 Waterborne sun protection and heat insulation coating
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