CN113930149A - Production process of high weather-resistant coating for track traffic PC glass plate - Google Patents
Production process of high weather-resistant coating for track traffic PC glass plate Download PDFInfo
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- CN113930149A CN113930149A CN202111121832.5A CN202111121832A CN113930149A CN 113930149 A CN113930149 A CN 113930149A CN 202111121832 A CN202111121832 A CN 202111121832A CN 113930149 A CN113930149 A CN 113930149A
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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
- C09D175/06—Polyurethanes from polyesters
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/08—Processes
- C08G18/10—Prepolymer processes involving reaction of isocyanates or isothiocyanates with compounds having active hydrogen in a first reaction step
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/30—Low-molecular-weight compounds
- C08G18/38—Low-molecular-weight compounds having heteroatoms other than oxygen
- C08G18/3802—Low-molecular-weight compounds having heteroatoms other than oxygen having halogens
- C08G18/3804—Polyhydroxy compounds
- C08G18/3812—Polyhydroxy compounds having fluorine atoms
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/40—High-molecular-weight compounds
- C08G18/42—Polycondensates having carboxylic or carbonic ester groups in the main chain
- C08G18/4236—Polycondensates having carboxylic or carbonic ester groups in the main chain containing only aliphatic groups
- C08G18/4238—Polycondensates having carboxylic or carbonic ester groups in the main chain containing only aliphatic groups derived from dicarboxylic acids and dialcohols
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/65—Low-molecular-weight compounds having active hydrogen with high-molecular-weight compounds having active hydrogen
- C08G18/66—Compounds of groups C08G18/42, C08G18/48, or C08G18/52
- C08G18/6633—Compounds of group C08G18/42
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/70—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the isocyanates or isothiocyanates used
- C08G18/72—Polyisocyanates or polyisothiocyanates
- C08G18/74—Polyisocyanates or polyisothiocyanates cyclic
- C08G18/75—Polyisocyanates or polyisothiocyanates cyclic cycloaliphatic
- C08G18/751—Polyisocyanates or polyisothiocyanates cyclic cycloaliphatic containing only one cycloaliphatic ring
- C08G18/752—Polyisocyanates or polyisothiocyanates cyclic cycloaliphatic containing only one cycloaliphatic ring containing at least one isocyanate or isothiocyanate group linked to the cycloaliphatic ring by means of an aliphatic group
- C08G18/753—Polyisocyanates or polyisothiocyanates cyclic cycloaliphatic containing only one cycloaliphatic ring containing at least one isocyanate or isothiocyanate group linked to the cycloaliphatic ring by means of an aliphatic group containing one isocyanate or isothiocyanate group linked to the cycloaliphatic ring by means of an aliphatic group having a primary carbon atom next to the isocyanate or isothiocyanate group
- C08G18/755—Polyisocyanates or polyisothiocyanates cyclic cycloaliphatic containing only one cycloaliphatic ring containing at least one isocyanate or isothiocyanate group linked to the cycloaliphatic ring by means of an aliphatic group containing one isocyanate or isothiocyanate group linked to the cycloaliphatic ring by means of an aliphatic group having a primary carbon atom next to the isocyanate or isothiocyanate group and at least one isocyanate or isothiocyanate group linked to a secondary carbon atom of the cycloaliphatic ring, e.g. isophorone diisocyanate
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G2150/00—Compositions for coatings
Abstract
The invention relates to a production process of a high weather-resistant coating for a track traffic PC glass plate, which comprises the following steps: step S1, preparing an intermediate 1; step S2, preparing a prepolymer; step S3, adding polyester polyol into butyl acetate, adding prepolymer and dibutyltin dilaurate after stirring at a constant speed for 15min, adding defoaming agent after stirring at a constant speed for 5min, coating the mixture on the surface of a PC glass plate by using a film coating device after stirring uniformly, and standing the mixture at room temperature for 30min to form a high weather-resistant coating; the coating has good transparency, does not influence the use of the PC glass plate, and introduces fluorocarbon chains in the preparation process, thereby not only endowing the prepared reaction product with excellent weather resistance and preventing the prepared coating from yellowing, but also having lower surface energy, friction coefficient and excellent hydrophobic and oleophobic properties.
Description
Technical Field
The invention belongs to the technical field of weather-resistant coatings, and particularly relates to a production process of a high weather-resistant coating for a track traffic PC glass plate.
Background
After being coated, the coating forms a uniform and continuous coating film on the surface of the high-speed rail PC glass plate, the coating film has certain thickness, flexibility and hardness, and has the characteristics of wear resistance, water resistance, acid-base corrosion resistance, pollution resistance, ultraviolet light irradiation resistance, weather change resistance, mildew corrosion resistance and the like, the damage effect of atmosphere, moisture, acid rain, dust and microorganisms on buildings can be reduced or eliminated, and a plurality of factors influencing the service life of the coating are summarized as follows: ultraviolet rays, humidity, ozone, high temperature, acid rain, industrial waste gas, and the like;
however, the coating currently used on the surface of the high-iron PC glass plate can be yellowed after long-time ultraviolet irradiation and the influence of outdoor environmental climate, which affects the service life of the coating.
Disclosure of Invention
The invention aims to provide a production process of a high weather-resistant coating for a track traffic PC glass plate.
The purpose of the invention can be realized by the following technical scheme:
a production process of a high weather-resistant coating for a track traffic PC glass plate comprises the following steps:
step S1, adding diethanolamine and hexafluorobutyl methacrylate into absolute ethyl alcohol, heating in a water bath at 55-60 ℃, reacting for 8h to obtain a crude product, extracting with deionized water for three times, and distilling under reduced pressure to obtain an intermediate 1, wherein the molar ratio of the diethanolamine to the hexafluorobutyl methacrylate to the absolute ethyl alcohol is controlled to be 1: 1;
in the step S1, the anhydrous ethanol is used as a solvent, and diethanolamine and hexafluorobutyl methacrylate react to generate an intermediate 1, wherein the reaction process is as follows:
structurally, the intermediate 1 is a fluorine-containing diol.
Step S2, adding isophorone diisocyanate and the intermediate 1 into N, N-dimethylformamide, stirring at a constant speed, adding dibutyltin dilaurate, heating to 90-100 ℃, stirring at a constant speed, reacting, monitoring the content of isocyanate groups in the reaction process until the content of the isocyanate groups is unchanged, stopping the reaction to obtain a prepolymer, and controlling the molar ratio of the isophorone diisocyanate to the intermediate 1 to be 7-10: 1, wherein the amount of the N, N-dimethylformamide is the sum of the weight of the isophorone diisocyanate and the weight of the intermediate 1, and the amount of the dibutyltin dilaurate is 0.1-0.15% of the weight of the isophorone diisocyanate;
in the step S2, isophorone diisocyanate reacts with the intermediate 1 to generate a prepolymer, which is an isocyanate group-terminated polymer and into which fluorine is introduced.
And step S3, adding polyester polyol into butyl acetate, adding prepolymer and dibutyltin dilaurate after stirring at a constant speed for 15min, adding a defoaming agent after stirring at a constant speed for 5min, uniformly stirring, coating the surface of a PC glass plate with a film coating device, standing at room temperature for 30min, and curing at 65 ℃ for 5 days to form a high weather-resistant coating, wherein the weight ratio of the polyester polyol to the prepolymer to the butyl acetate is controlled to be 1: 1.5: 10, the amount of dibutyltin dilaurate is 1.5-1.8% of the weight of the polyester polyol, and the amount of the defoaming agent is 10 times of the weight of the dibutyltin dilaurate.
Further: the polyester polyol is prepared by the following steps:
mixing succinic acid and 1, 4-butanediol, stirring at a constant speed, adding a catalyst, introducing carbon dioxide to discharge air, uninterruptedly introducing the carbon dioxide, placing in a 180 ℃ salt bath with 150 ℃ plus materials, reacting for 2h at the temperature, stopping introducing the carbon dioxide after the reaction is finished, vacuumizing, and reacting for 2h in a vacuum system to obtain the polyester polyol.
Further: the mol ratio of the succinic acid to the 1, 4-butanediol is 1.2: 1, and the dosage of the catalyst is 1.5-2% of the sum of the weight of the succinic acid and the weight of the 1, 4-butanediol.
Further: the thickness of the coating film in step S3 is 0.15-0.3 mm.
The invention has the beneficial effects that:
the high weather-resistant coating can be applied to the field of PC glass plates, the surface of the PC glass plate is coated, then the coating is kept stand at room temperature for 30min, and the coating is cured for 5 days at 65 ℃ to form the high weather-resistant coating, in the process of preparing the coating, diethanol amine and hexafluorobutyl methacrylate react to generate an intermediate 1, structurally, the intermediate 1 is fluorine-containing dihydric alcohol, isophorone diisocyanate reacts with the intermediate 1 to generate a prepolymer, the prepolymer is an isocyanate-terminated polymer, fluorine element is introduced into the prepolymer, the prepolymer and polyester polyol are mixed and react, finally, a reaction product is coated to prepare the high weather-resistant coating, firstly, the coating has good transparency, the use of the PC glass plate cannot be influenced, secondly, fluorocarbon chains are introduced in the preparation process, and the prepared reaction product has excellent weather resistance, the prepared coating is prevented from yellowing, and has lower surface energy, friction coefficient and excellent hydrophobic and oleophobic properties.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
A production process of a high weather-resistant coating for a track traffic PC glass plate comprises the following steps:
step S1, adding diethanolamine and hexafluorobutyl methacrylate into absolute ethyl alcohol, heating in a water bath at 55 ℃, reacting for 8 hours to obtain a crude product, extracting with deionized water for three times, and distilling under reduced pressure to obtain an intermediate 1, wherein the molar ratio of the diethanolamine to the hexafluorobutyl methacrylate to the absolute ethyl alcohol is controlled to be 1: 1;
step S2, adding isophorone diisocyanate and the intermediate 1 into N, N-dimethylformamide, stirring at a constant speed, adding dibutyltin dilaurate, heating to 90 ℃, stirring at a constant speed, reacting, monitoring the content of isocyanate groups in the reaction process until the content of the isocyanate groups is unchanged, stopping the reaction to obtain a prepolymer, controlling the molar ratio of the isophorone diisocyanate to the intermediate 1 to be 7: 1, controlling the using amount of the N, N-dimethylformamide to be the sum of the weight of the isophorone diisocyanate and the weight of the intermediate 1, and controlling the using amount of the dibutyltin dilaurate to be 0.1% of the weight of the isophorone diisocyanate;
step S3, adding polyester polyol into butyl acetate, adding prepolymer and dibutyltin dilaurate after stirring at a constant speed for 15min, adding defoamer BYK141 after stirring at a constant speed for 5min, coating the mixture on the surface of a PC glass plate by using a film coating device after stirring uniformly, standing the mixture at room temperature for 30min, and curing the mixture at 65 ℃ for 5 days to form a high weather-resistant coating, wherein the weight ratio of the polyester polyol to the prepolymer to the butyl acetate is controlled to be 1: 1.5: 10, the amount of dibutyltin dilaurate is 1.5% of the weight of the polyester polyol, and the amount of the defoamer BYK141 is 10 times of the weight of the dibutyltin dilaurate.
The polyester polyol is prepared by the following steps:
mixing succinic acid and 1, 4-butanediol, stirring at a constant speed, adding tetrabutyl titanate, introducing carbon dioxide to discharge air, uninterruptedly introducing carbon dioxide, placing in a salt bath at 150 ℃, reacting for 2h at the temperature, stopping introducing the carbon dioxide after the reaction is finished, vacuumizing, and reacting for 2h in a vacuum system to prepare polyester polyol, wherein the molar ratio of the succinic acid to the 1, 4-butanediol is 1.2: 1, and the dosage of the tetrabutyl titanate is 1.5 percent of the sum of the weight of the succinic acid and the 1, 4-butanediol.
Example 2
A production process of a high weather-resistant coating for a track traffic PC glass plate comprises the following steps:
step S1, adding diethanolamine and hexafluorobutyl methacrylate into absolute ethyl alcohol, heating in a water bath at 55 ℃, reacting for 8 hours to obtain a crude product, extracting with deionized water for three times, and distilling under reduced pressure to obtain an intermediate 1, wherein the molar ratio of the diethanolamine to the hexafluorobutyl methacrylate to the absolute ethyl alcohol is controlled to be 1: 1;
step S2, adding isophorone diisocyanate and the intermediate 1 into N, N-dimethylformamide, stirring at a constant speed, adding dibutyltin dilaurate, heating to 90 ℃, stirring at a constant speed, reacting, monitoring the content of isocyanate groups in the reaction process until the content of the isocyanate groups is unchanged, stopping the reaction to obtain a prepolymer, controlling the molar ratio of the isophorone diisocyanate to the intermediate 1 to be 8: 1, controlling the using amount of the N, N-dimethylformamide to be the sum of the weight of the isophorone diisocyanate and the weight of the intermediate 1, and controlling the using amount of the dibutyltin dilaurate to be 0.12% of the weight of the isophorone diisocyanate;
step S3, adding polyester polyol into butyl acetate, adding prepolymer and dibutyltin dilaurate after stirring at a constant speed for 15min, adding defoamer BYK141 after stirring at a constant speed for 5min, coating the mixture on the surface of a PC glass plate by using a film coating device after stirring uniformly, standing the mixture at room temperature for 30min, and curing the mixture at 65 ℃ for 5 days to form a high weather-resistant coating, wherein the weight ratio of the polyester polyol to the prepolymer to the butyl acetate is controlled to be 1: 1.5: 10, the amount of dibutyltin dilaurate is 1.6% of the weight of the polyester polyol, and the amount of the defoamer BYK141 is 10 times of the weight of the dibutyltin dilaurate.
The polyester polyol is prepared by the following steps:
mixing succinic acid and 1, 4-butanediol, stirring at a constant speed, adding tetrabutyl titanate, introducing carbon dioxide to discharge air, uninterruptedly introducing carbon dioxide, placing in a salt bath at 160 ℃, reacting for 2 hours at the temperature, stopping introducing the carbon dioxide after the reaction is finished, vacuumizing, and reacting for 2 hours in a vacuum system to prepare polyester polyol, wherein the molar ratio of the succinic acid to the 1, 4-butanediol is 1.2: 1, and the dosage of the tetrabutyl titanate is 1.8 percent of the sum of the weight of the succinic acid and the 1, 4-butanediol.
Example 3
A production process of a high weather-resistant coating for a track traffic PC glass plate comprises the following steps:
step S1, adding diethanolamine and hexafluorobutyl methacrylate into absolute ethyl alcohol, heating in a water bath at 60 ℃, reacting for 8 hours to obtain a crude product, extracting with deionized water for three times, and distilling under reduced pressure to obtain an intermediate 1, wherein the molar ratio of the diethanolamine to the hexafluorobutyl methacrylate to the absolute ethyl alcohol is controlled to be 1: 1;
step S2, adding isophorone diisocyanate and the intermediate 1 into N, N-dimethylformamide, stirring at a constant speed, adding dibutyltin dilaurate, heating to 100 ℃, stirring at a constant speed, reacting, monitoring the content of isocyanate groups in the reaction process until the content of the isocyanate groups is unchanged, stopping the reaction to obtain a prepolymer, controlling the molar ratio of the isophorone diisocyanate to the intermediate 1 to be 9: 1, controlling the using amount of the N, N-dimethylformamide to be the sum of the weight of the isophorone diisocyanate and the weight of the intermediate 1, and controlling the using amount of the dibutyltin dilaurate to be 0.14% of the weight of the isophorone diisocyanate;
step S3, adding polyester polyol into butyl acetate, adding prepolymer and dibutyltin dilaurate after stirring at a constant speed for 15min, adding defoamer BYK141 after stirring at a constant speed for 5min, coating the mixture on the surface of a PC glass plate by using a film coating device after stirring uniformly, standing the mixture at room temperature for 30min, and curing the mixture at 65 ℃ for 5 days to form a high weather-resistant coating, wherein the weight ratio of the polyester polyol to the prepolymer to the butyl acetate is controlled to be 1: 1.5: 10, the amount of dibutyltin dilaurate is 1.7 percent of the weight of the polyester polyol, and the amount of the defoamer BYK141 is 10 times of the weight of the dibutyltin dilaurate.
The polyester polyol is prepared by the following steps:
mixing succinic acid and 1, 4-butanediol, stirring at a constant speed, adding tetrabutyl titanate, introducing carbon dioxide to discharge air, uninterruptedly introducing the carbon dioxide, placing in a salt bath at 180 ℃, reacting for 2 hours at the temperature, stopping introducing the carbon dioxide after the reaction is finished, vacuumizing, and reacting for 2 hours in a vacuum system to prepare polyester polyol, wherein the molar ratio of the succinic acid to the 1, 4-butanediol is 1.2: 1, and the dosage of the catalyst is 1.8 percent of the sum of the weight of the succinic acid and the 1, 4-butanediol.
Example 4
A production process of a high weather-resistant coating for a track traffic PC glass plate comprises the following steps:
step S1, adding diethanolamine and hexafluorobutyl methacrylate into absolute ethyl alcohol, heating in a water bath at 60 ℃, reacting for 8 hours to obtain a crude product, extracting with deionized water for three times, and distilling under reduced pressure to obtain an intermediate 1, wherein the molar ratio of the diethanolamine to the hexafluorobutyl methacrylate to the absolute ethyl alcohol is controlled to be 1: 1;
step S2, adding isophorone diisocyanate and the intermediate 1 into N, N-dimethylformamide, stirring at a constant speed, adding dibutyltin dilaurate, heating to 100 ℃, stirring at a constant speed, reacting, monitoring the content of isocyanate groups in the reaction process until the content of the isocyanate groups is unchanged, stopping the reaction to obtain a prepolymer, controlling the molar ratio of the isophorone diisocyanate to the intermediate 1 to be 10: 1, controlling the using amount of the N, N-dimethylformamide to be the sum of the weight of the isophorone diisocyanate and the weight of the intermediate 1, and controlling the using amount of the dibutyltin dilaurate to be 0.15% of the weight of the isophorone diisocyanate;
step S3, adding polyester polyol into butyl acetate, adding prepolymer and dibutyltin dilaurate after stirring at a constant speed for 15min, adding defoamer BYK141 after stirring at a constant speed for 5min, coating the mixture on the surface of a PC glass plate by using a film coating device after stirring uniformly, standing the mixture at room temperature for 30min, and curing the mixture at 65 ℃ for 5 days to form a high weather-resistant coating, wherein the weight ratio of the polyester polyol to the prepolymer to the butyl acetate is controlled to be 1: 1.5: 10, the amount of dibutyltin dilaurate is 1.8% of the weight of the polyester polyol, and the amount of the defoamer BYK141 is 10 times of the weight of the dibutyltin dilaurate.
The polyester polyol is prepared by the following steps:
mixing succinic acid and 1, 4-butanediol, stirring at a constant speed, adding tetrabutyl titanate, introducing carbon dioxide to discharge air, uninterruptedly introducing carbon dioxide, placing in a salt bath at 180 ℃, reacting for 2h at the temperature, stopping introducing the carbon dioxide after the reaction is finished, vacuumizing, and reacting for 2h in a vacuum system to prepare polyester polyol, wherein the molar ratio of the succinic acid to the 1, 4-butanediol is 1.2: 1, and the dosage of the catalyst is 2% of the sum of the weight of the succinic acid and the 1, 4-butanediol.
Comparative example 1
This comparative example compared to example 1, replacing hexafluorobutyl methacrylate with n-butyl methacrylate.
Comparative example 2
This comparative example is a clear polyurethane coating produced by a commercially available company.
The coatings prepared in examples 1-4 and comparative examples 1-2 were passed through a GP/UV weathering chamber test and the time to embrittlement yellowing was calculated and the results are shown in the following table.
It can be seen from the above table that examples 1-4 have excellent weather resistance.
In the description herein, references to the description of "one embodiment," "an example," "a specific example" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The foregoing is illustrative and explanatory only and is not intended to be exhaustive or to limit the invention to the precise embodiments described, and various modifications, additions, and substitutions may be made by those skilled in the art without departing from the scope of the invention or exceeding the scope of the claims.
Claims (7)
1. A production process of a high weather-resistant coating for a track traffic PC glass plate is characterized by comprising the following steps: the method comprises the following steps:
step S1, adding diethanolamine and hexafluorobutyl methacrylate into absolute ethyl alcohol, heating in a water bath at 55-60 ℃, reacting for 8h to obtain a crude product, extracting with deionized water for three times, and distilling under reduced pressure to obtain an intermediate 1;
step S2, adding isophorone diisocyanate and the intermediate 1 into N, N-dimethylformamide, stirring at a constant speed, adding dibutyltin dilaurate, heating to 90-100 ℃, stirring at a constant speed, reacting, monitoring the content of isocyanate groups in the reaction process until the content of the isocyanate groups is unchanged, and terminating the reaction to obtain a prepolymer;
and step S3, adding polyester polyol into butyl acetate, stirring at a constant speed for 15min, adding prepolymer and dibutyltin dilaurate, stirring at a constant speed for 5min, adding a defoaming agent, stirring uniformly, coating the surface of a PC glass plate by using a film coating device, standing at room temperature for 30min, and curing at 65 ℃ for 5 days to form the high weather-resistant coating.
2. The process for producing the weather-resistant coating for the PC glass plate for rail transit according to claim 1, wherein the weather-resistant coating comprises the following steps: in step S1, the molar ratio of diethanolamine, hexafluorobutyl methacrylate and absolute ethyl alcohol is controlled to be 1: 1.
3. The process for producing the weather-resistant coating for the PC glass plate for rail transit according to claim 1, wherein the weather-resistant coating comprises the following steps: in the step S2, the molar ratio of isophorone diisocyanate to intermediate 1 is controlled to be 7-10: 1, the dosage of N, N-dimethylformamide is the sum of the weight of isophorone diisocyanate and intermediate 1, and the dosage of dibutyltin dilaurate is 0.1-0.15% of the weight of isophorone diisocyanate.
4. The process for producing the weather-resistant coating for the PC glass plate for rail transit according to claim 1, wherein the weather-resistant coating comprises the following steps: in step S3, the weight ratio of the polyester polyol to the prepolymer to the butyl acetate is controlled to be 1: 1.5: 10, the amount of the dibutyltin dilaurate is 1.5-1.8% of the weight of the polyester polyol, and the amount of the defoamer is 10 times of the weight of the dibutyltin dilaurate.
5. The process for producing the weather-resistant coating for the PC glass plate for rail transit according to claim 1, wherein the weather-resistant coating comprises the following steps: the polyester polyol is prepared by the following steps:
mixing succinic acid and 1, 4-butanediol, stirring at a constant speed, adding a catalyst, introducing carbon dioxide to discharge air, uninterruptedly introducing the carbon dioxide, placing in a 180 ℃ salt bath with 150 ℃ plus materials, reacting for 2h at the temperature, stopping introducing the carbon dioxide after the reaction is finished, vacuumizing, and reacting for 2h in a vacuum system to obtain the polyester polyol.
6. The process for producing the weather-resistant coating for the PC glass plate for rail transit according to claim 5, wherein the weather-resistant coating comprises the following steps: the mol ratio of the succinic acid to the 1, 4-butanediol is 1.2: 1, and the dosage of the catalyst is 1.5-2% of the sum of the weight of the succinic acid and the weight of the 1, 4-butanediol.
7. The process for producing the weather-resistant coating for the PC glass plate for rail transit according to claim 1, wherein the weather-resistant coating comprises the following steps: the thickness of the coating film in step S3 is 0.15-0.3 mm.
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| GB9211794D0 (en) * | 1992-06-04 | 1992-07-15 | Ici Resins Bv | Aqueous coating compositions |
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