CN113105612A - Polyester resin for wet-on-wet process and preparation method and application thereof - Google Patents
Polyester resin for wet-on-wet process and preparation method and application thereof Download PDFInfo
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- CN113105612A CN113105612A CN202110217413.5A CN202110217413A CN113105612A CN 113105612 A CN113105612 A CN 113105612A CN 202110217413 A CN202110217413 A CN 202110217413A CN 113105612 A CN113105612 A CN 113105612A
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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
- C08G63/00—Macromolecular compounds obtained by reactions forming a carboxylic ester link in the main chain of the macromolecule
- C08G63/02—Polyesters derived from hydroxycarboxylic acids or from polycarboxylic acids and polyhydroxy compounds
- C08G63/12—Polyesters derived from hydroxycarboxylic acids or from polycarboxylic acids and polyhydroxy compounds derived from polycarboxylic acids and polyhydroxy compounds
- C08G63/16—Dicarboxylic acids and dihydroxy compounds
- C08G63/20—Polyesters having been prepared in the presence of compounds having one reactive group or more than two reactive groups
- C08G63/21—Polyesters having been prepared in the presence of compounds having one reactive group or more than two reactive groups in the presence of unsaturated monocarboxylic acids or unsaturated monohydric alcohols or reactive derivatives thereof
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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
- C08G63/00—Macromolecular compounds obtained by reactions forming a carboxylic ester link in the main chain of the macromolecule
- C08G63/02—Polyesters derived from hydroxycarboxylic acids or from polycarboxylic acids and polyhydroxy compounds
- C08G63/12—Polyesters derived from hydroxycarboxylic acids or from polycarboxylic acids and polyhydroxy compounds derived from polycarboxylic acids and polyhydroxy compounds
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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
- C08G63/00—Macromolecular compounds obtained by reactions forming a carboxylic ester link in the main chain of the macromolecule
- C08G63/02—Polyesters derived from hydroxycarboxylic acids or from polycarboxylic acids and polyhydroxy compounds
- C08G63/12—Polyesters derived from hydroxycarboxylic acids or from polycarboxylic acids and polyhydroxy compounds derived from polycarboxylic acids and polyhydroxy compounds
- C08G63/16—Dicarboxylic acids and dihydroxy compounds
- C08G63/20—Polyesters having been prepared in the presence of compounds having one reactive group or more than two reactive groups
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D167/00—Coating compositions based on polyesters obtained by reactions forming a carboxylic ester link in the main chain; Coating compositions based on derivatives of such polymers
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D167/00—Coating compositions based on polyesters obtained by reactions forming a carboxylic ester link in the main chain; Coating compositions based on derivatives of such polymers
- C09D167/06—Unsaturated polyesters having carbon-to-carbon unsaturation
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Organic Chemistry (AREA)
- Health & Medical Sciences (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Wood Science & Technology (AREA)
- Polyesters Or Polycarbonates (AREA)
Abstract
The invention relates to a polyester resin for a wet-on-wet process and a preparation method and application thereof. The polyester resin comprises the following components in parts by weight: 100 parts of dihydric/polyhydric alcohol, 130-135 parts of dibasic/polybasic carboxylic acid and anhydride or ester thereof, and 45-55 parts of medium-long chain fatty acid. The polyester resin provided by the invention is introduced with a specific amount of medium-long chain fatty acid to replace the original binary/polycarboxylic acid and the derivative thereof, so that the polyester resin has good affinity to the base coats of various colors, can be directly constructed under the condition that the base coats are not dried and cured, has no phenomena of dissolution and repulsion to the base coats, and realizes a wet-on-wet process.
Description
Technical Field
The invention belongs to the technical field of chemical production, and particularly relates to a polyester resin for a wet-on-wet process, and a preparation method and application thereof.
Background
Polyester resins are generally prepared by condensation (or transesterification) polymerization of organic di/polycarboxylic acids (anhydrides or esters) with di-or polyhydric alcohols. The polyester resin has excellent adhesive force to metal base materials, and is widely used for preparing amino baking varnish type tin printing coatings and coil coatings. Such coatings typically require a base coat that provides good adhesion to the substrate and a top coat/varnish that further provides protective and decorative properties such as weatherability.
The amino baking varnish needs to be cured at high temperature, usually after the primer is cured, the coating ink is cured, and the coating varnish/gloss oil is further baked and cured. The wet-on-wet process refers to that the primer is coated and then the ink is coated, the gloss oil is directly coated without drying, and the one-time baking and curing are carried out. Gloss oil prepared by a common amino/polyester resin system is directly coated on the unbaked and cured printing ink, and the printing ink and the gloss oil mutually permeate or are agglomerated and shrunk to cause dry film glossing, blurred pattern boundaries and even bottom exposure, so that the requirements of a wet-on-wet process cannot be met.
The iron printing coating and the coil coating are cured at high temperature, the heat supply fuel and labor cost are main expenses, one-time baking can be reduced by adopting a wet-on-wet process, and the cost can be effectively reduced. The development of coating resins suitable for wet-on-wet processes has important practical and economic significance for energy conservation, environmental protection and cost saving.
The iron printing paint adopts epoxy ester resin to realize wet-on-wet process. However, the price of epoxy resin is relatively high, and free bisphenol A is limited by some legal laws, and acrylic resin is mainly used as wet-on-wet gloss oil at present. The acrylic resin gloss oil has a relatively common wet-on-wet effect, the distribution of the curing functional group hydroxyl of the acrylic resin is not uniform, and a higher hydroxyl value is required to meet the curing performance, so that the tensile property of the gloss oil is insufficient, and the gloss oil can only be used in occasions with low processing performance. The hydroxyl of the polyester resin is distributed at the tail end of the molecule, the crosslinking structure is regular, the flexibility and the hardness are easy to balance, the comprehensive performance is excellent, but the wet-on-wet effect is worse.
At present, researches on improving and optimizing the characteristic of polyester resin are carried out, for example, patent CN110938363A discloses a scheme for preparing a wet-on-wet high-performance waterborne polyurethane finish paint by compounding hydroxyl acrylic resin and polyester resin, but the researches are deficient.
Therefore, the development of a polyester resin that can be used in a wet-on-wet process has important research significance and economic value.
Disclosure of Invention
The invention aims to overcome the defect or deficiency of poor wet-on-wet effect of polyester resin in the prior art, and provides the polyester resin for the wet-on-wet process. The polyester resin provided by the invention is introduced with a specific amount of medium-long chain fatty acid to replace the original dicarboxylic acid, so that the polyester resin has good affinity to the base coats of various colors, can be directly constructed under the condition that the base coats are not dried and cured, has no phenomena of dissolution and repulsion to the base coats, and realizes a wet-on-wet process.
Another object of the present invention is to provide a method for preparing the polyester resin.
The invention also aims to provide application of the polyester resin in preparing metal printing coatings or coil coatings.
In order to achieve the purpose, the invention adopts the following technical scheme:
a polyester resin for a wet-on-wet process comprises the following components in parts by weight:
100 parts of binary/polyhydric alcohol,
130-135 parts of binary/polybasic carboxylic acid and anhydride or ester thereof,
45-55 parts of medium-long chain fatty acid.
The inventor of the invention researches repeatedly and discovers that the surface tension of the polyester resin is reduced by introducing medium-long chain fatty acid into a polyester system to replace the original di-or polycarboxylic acid and the derivative thereof (di-or polycarboxylic acid and anhydride or ester thereof), thereby improving the affinity of the polyester resin for priming coats with various colors; the use amount of the medium-long chain fatty acid has great influence on the affinity and other performances of the polyester resin, if the use amount of the medium-long chain fatty acid is too small, the improvement on the affinity is not obvious, and the gloss oil prepared from the obtained polyester resin has poor wet-on-wet effect; if the medium-long chain fatty acid is used in a large amount, the gloss oil coating prepared from the obtained polyester resin is soft, so that the paint film is easy to scratch, and even the plate surface is seriously adhered. The invention endows the polyester resin with good affinity to the base coats of various colors by selecting the medium-long chain fatty acid with proper dosage, can be directly constructed under the condition that the base coats are not dried and cured, has no phenomena of dissolution and exclusion to the base coats, and realizes a wet-on-wet process.
It is to be understood that the dihydric/polyhydric alcohol represents either a dihydric alcohol or a polyhydric alcohol (trihydric and tetrahydric alcohols, etc.) or a mixture of dihydric or polyhydric alcohols.
Similarly, the di/poly carboxylic acid and the anhydride or ester thereof refer to any one or more of the mixture of di-carboxylic acid, di-acid anhydride, di-acid ester, poly carboxylic acid, poly acid anhydride and poly acid ester.
Under the formula condition of the invention, the content of medium-long chain fatty acid is 20-25%.
Any di/polyhydric alcohol, di/polybasic carboxylic acid and anhydride or ester thereof conventional in the art may be used in the present invention.
Preferably, the dihydric/polyhydric alcohol is one or more of ethylene glycol, propylene glycol, methyl propylene glycol, neopentyl glycol or trimethylolpropane.
Preferably, the di/polycarboxylic acid and the anhydride or ester thereof are one or more of phthalic acid, phthalic anhydride, dimethyl benzene, adipic acid or trimellitic anhydride.
Preferably, the medium-long chain fatty acid is C8～20Fatty acids of (2), for example, isooctanoic acid, isononanoic acid, lauric acid, coconut oil acid, soya oil acid, dehydrated ricinoleic acid, stearic acid and the like
More preferably, the medium-long chain fatty acid is in liquid form C8～20Such as isooctanoic acid, isononanoic acid, coconut oleic acid, soya oleic acid, dehydrated ricinoleic acid and the like.
It should be understood that the liquid form C8～20The fatty acid is liquid at ordinary temperatureC of state8～20The fatty acid of (2). The liquid fatty acid has an irregular structure compared with the solid fatty acid with the same molecular weight, and is favorable for the solvent dissolution stability of the synthetic polyester resin.
Preferably, the hydroxyl value of the polyester resin is 20 to 40 mgKOH/g.
The hydroxyl value of the polyester resin has certain influence on the performance of the polyester resin, for example, the hydroxyl value is too high, the molecular weight is low, more amino curing agents are required to be added for achieving good crosslinking, and the flexibility of a paint film is poor; if the hydroxyl value is too low, the molecular weight is high, the addition amount of the amino curing agent is low, and the hardness of a paint film is poor.
More preferably, the hydroxyl value of the polyester resin is 25 to 35 mgKOH/g.
Preferably, the polyester resin further includes a solvent (e.g., ethylene glycol monobutyl ether, propylene glycol methyl ether acetate, isophorone, 100# solvent oil, 150# solvent oil, etc.).
The polyester resin can be adjusted to a specific solids content (e.g., 40-75%) using a solvent; meanwhile, after the product is reasonably diluted, the leveling property and stability of the product can be improved.
The preparation method of the polyester resin comprises the following steps: mixing binary/polyhydric alcohol, binary/polybasic carboxylic acid and anhydride or ester thereof, medium-long chain fatty acid and catalyst, and reacting to obtain the polyester resin.
Preferably, the catalyst is one or more of tin catalysts (such as monobutyl tin oxide, stannous octoate) and titanium catalysts, and can be obtained commercially.
Preferably, the polyester resin is prepared by the following process: mixing dihydric/polyhydric alcohol, dibasic/polybasic carboxylic acid and anhydride or ester thereof and medium-long chain fatty acid, heating to 80-120 ℃, adding a catalyst, continuing to heat, controlling the temperature of distillate to be not more than 100 ℃, slowly heating to 210-250 ℃, and preserving heat; and (3) after the temperature of the distillate is reduced to below 80 ℃, taking the reaction material for observation, adding a reflux solvent for reflux when the reaction material is completely uniform and transparent, and diluting the reflux solvent into the target solvent type resin by using the solvent when the acid value reaches a set index (for example, 0-10, preferably 0-5).
The application of the polyester resin in preparing the metal printing coating or the coil coating is also within the protection scope of the invention.
Compared with the prior art, the invention has the following beneficial effects:
the polyester resin provided by the invention is introduced with a specific amount of medium-long chain fatty acid to replace the original binary/polycarboxylic acid and the derivative thereof, so that the polyester resin has good affinity to the base coats of various colors, can be directly constructed under the condition that the base coats are not dried and cured, has no phenomena of dissolution and repulsion to the base coats, and realizes a wet-on-wet process.
Detailed Description
The invention is further illustrated by the following examples. These examples are intended to illustrate the invention and are not intended to limit the scope of the invention. Experimental procedures without specific conditions noted in the examples below, generally according to conditions conventional in the art or as suggested by the manufacturer; the raw materials, reagents and the like used are, unless otherwise specified, those commercially available from the conventional markets and the like. Any insubstantial changes and substitutions made by those skilled in the art based on the present invention are intended to be covered by the claims.
Example 1
The examples provide a polyester resin having a fatty acid content of 20% and prepared as follows.
In a transparent reaction vessel, 167.76g of neopentyl glycol, 48.90g of propylene glycol, 96.90g of coconut oil acid, 111.56g of terephthalic acid, 114.58g of isophthalic acid and 66.02g of trimellitic anhydride were charged. The temperature is raised to 100 ℃, 0.30g of catalyst monobutyl tin oxide is added, and stirring is started. And continuously raising the temperature, and controlling the temperature of the distillate to be less than 94 ℃. The temperature is maintained at 220 ℃ and 230 ℃. After the materials are transparent and the temperature of the distillate is reduced to 70 ℃, 21.40g of dimethylbenzene is added, the temperature is maintained at 210 ℃ and 220 ℃, reflux dehydration is carried out, the acid value is tested every 1 hour, and when the acid value is less than 5mgKOH/g, 306.52g of 150# solvent oil (aromatic hydrocarbon mixture at 180 ℃ and 210 ℃) and 32.08g of ethylene glycol monobutyl ether are added and stirred uniformly. And discharging when the temperature is reduced to 120 ℃. The theoretical hydroxyl value of the obtained product is 32.2mgKOH/g, the color number is 1# (Fe-Co), the acid value is 2.40mgKOH/g, the viscosity is 1000mpas/25 ℃, and the solid content is 59.20%.
Example 2
This example provides a polyester resin having a fatty acid content of 25% and prepared as follows.
In a transparent reaction vessel, 163.05g of neopentyl glycol, 48.74g of propylene glycol, 114.69g of dehydrated ricinoleic acid, 108.66g of terephthalic acid, 114.20g of isophthalic acid and 54.33g of trimellitic anhydride were charged. The temperature is raised to 100 ℃, 0.30g of catalyst monobutyl tin oxide is added, and stirring is started. And continuously raising the temperature, and controlling the temperature of the distillate to be less than 94 ℃. The temperature is maintained at 220 ℃ and 230 ℃. After the materials are transparent and the temperature of the distillate is reduced to 70 ℃, adding 21.33g of dimethylbenzene, maintaining the temperature at 210 ℃ and 220 ℃, refluxing and dehydrating, testing the acid value every 1 hour, adding 306.52g of 150# solvent oil and 32.08g of ethylene glycol monobutyl ether when the acid value is less than 5mgKOH/g, and uniformly stirring. And discharging when the temperature is reduced to 120 ℃. The theoretical hydroxyl value of the obtained product is 30.4mgKOH/g, the color number is 1-2# (Fe-Co), the acid value is 2.45mgKOH/g, the viscosity is 800mpas/25 ℃, and the solid content is 59.20%.
Comparative example 1
This comparative example provides a polyester resin having a fatty acid content of 0, which was prepared as follows.
Into a transparent reaction vessel were charged 163.01g of neopentyl glycol, 48.68g of propylene glycol, 158.73g of terephthalic acid, 114.25g of isophthalic acid, and 57.35g of trimellitic anhydride. The temperature is raised to 100 ℃, 0.30g of catalyst monobutyl tin oxide is added, and stirring is started. And continuously raising the temperature, and controlling the temperature of the distillate to be less than 94 ℃. The temperature is maintained at 220 ℃ and 230 ℃. After the materials are transparent and the temperature of the distillate is reduced to 70 ℃, 21.0g of dimethylbenzene is added, the temperature is maintained at 210 ℃ and 220 ℃, reflux dehydration is carried out, the acid value is tested every 1 hour, and when the acid value is less than 5mgKOH/g, 264.3g of No. 150 solvent oil is added and stirred uniformly. And discharging when the temperature is reduced to 120 ℃. The theoretical hydroxyl value of the obtained product is 30.03mgKOH/g, the color number is <1# (Fe-Co), the acid value is 2.33mgKOH/g, the viscosity is 7500mpas/25 ℃, and the solid content is 59.45%.
Comparative example 2
This example provides a polyester resin having a fatty acid content of 15% and prepared as follows.
In a transparent reaction vessel, 175.26g of neopentyl glycol, 49.14g of propylene glycol, 73.02g of dehydrated ricinoleic acid, 112.10g of terephthalic acid, 115.13g of isophthalic acid and 83.92g of trimellitic anhydride were charged. The temperature is raised to 100 ℃, 0.30g of catalyst monobutyl tin oxide is added, and stirring is started. And continuously raising the temperature, and controlling the temperature of the distillate to be less than 94 ℃. The temperature is maintained at 220 ℃ and 230 ℃. After the materials are transparent and the temperature of the distillate is reduced to 70 ℃, adding 21.50g of dimethylbenzene, maintaining the temperature at 210 ℃ and 220 ℃, refluxing and dehydrating, testing the acid value every 1 hour, adding 307.11g of 150# solvent oil and 32.24g of ethylene glycol monobutyl ether when the acid value is less than 5mgKOH/g, and uniformly stirring. And discharging when the temperature is reduced to 120 ℃. The theoretical hydroxyl value of the obtained product is 28.8mgKOH/g, the color number is 1# (Fe-Co), the acid value is 2.35mgKOH/g, the viscosity is 1800mpas/25 ℃, and the solid content is 59.70%.
Application example 1
When the iron printing is produced, a steel plate is coated with a base coat, dried and cured, and is coated with the ink with the roller number, and the ink with various colors is coated on the steel plate in an unbaked state and then dried. The wet-on-wet is not good, the wet film which is not dried and solidified shrinks, even the bottom is exposed, the colors are mutually permeated (ink dissolving phenomenon), even the bottom is exposed; after curing, the colors of the coating films are mutually interfered, the patterns are fuzzy, the light is lost, and even the bottom is exposed when the patterns are serious.
Laboratory tests show that on a steel plate which is pre-coated with a base coat and cured, various colors of printing ink are pulled by a pull rod, under the condition that the steel plate is not dried, wet-on-wet gloss oil is pulled by the pull rod, whether the wet film shrinks or even shows bottom exposure or not and whether the colors mutually permeate or not are observed, and then drying is carried out, whether the colors mutually interfere or not, whether the pattern is fuzzy or not and whether some parts show bottom exposure or not are further observed.
The coating was prepared according to the following coating formulation:
65% of the polyester resins obtained in each of examples and comparative examples,
10 percent of methyl-etherified amino resin,
10% of isophorone (isophorone),
15 percent of No. 150 solvent oil and the like,
0.2 percent of BYK110 defoaming agent,
0.2 percent of BYK310 leveling agent.
And coating commercially available alkyd metal decorating ink with various colors on a steel plate precoated with primer by using a 10# pull rod, leveling for 5 minutes, then hiking the coating by using the 10# pull rod, observing for 10 minutes, and putting into an oven to bake for 10-15 minutes. Actual production showed that the yellow and black inks were relatively difficult to wet on wet, and the following experiments were conducted using yellow, black and red inks for wet on wet testing, with the results shown in Table 1
Table 1 wet on wet process results
| Resin for paint | Example 1 | Example 2 | Comparative example 1 | Comparative example 2 |
| Red ink wet film | Non-solvent ink | Non-solvent ink | Light soluble ink | Non-solvent ink |
| Red ink dry film | No abnormality | No abnormality | Light loss | No abnormality |
| Black ink wet film | Non-solvent ink | Non-solvent ink | Dissolving ink seriously and exposing the bottom | Light soluble ink |
| Black ink dry film | No abnormality | No abnormality | Local bottom exposure | Light loss |
| Yellow ink wet film | Non-solvent ink | Non-solvent ink | Dissolving ink seriously and exposing the bottom | Ink dissolving |
| Yellow ink wet film | No abnormality | No abnormality | Local bottom exposure | Pattern boundary blurring |
As can be seen from Table 1, the polyester resin of each example of the invention has good affinity to the base coats of various colors, can be directly constructed under the condition that the base coats are not dried and cured, has no phenomena of dissolution and repulsion to the base coats, and realizes a wet-on-wet process. Whereas neither the addition of medium-long chain fatty acids (as in comparative example 1) nor the addition of too small an amount of medium-long chain fatty acids (as in comparative example 2) leads to a better wet-on-wet process.
It will be appreciated by those of ordinary skill in the art that the examples provided herein are intended to assist the reader in understanding the principles of the invention and are to be construed as being without limitation to such specifically recited examples and embodiments. Those skilled in the art can make various other specific changes and combinations based on the teachings of the present invention without departing from the spirit of the invention, and these changes and combinations are within the scope of the invention.
Claims (10)
1. The polyester resin for the wet-on-wet process is characterized by comprising the following components in parts by weight:
100 parts of binary/polyhydric alcohol,
130-135 parts of binary/polybasic carboxylic acid and anhydride or ester thereof,
45-55 parts of medium-long chain fatty acid.
2. The polyester resin according to claim 1, wherein the di/polyol is one or more selected from ethylene glycol, propylene glycol, methyl propylene glycol, neopentyl glycol and trimethylolpropane.
3. The polyester resin according to claim 1, wherein the di/polycarboxylic acid and the anhydride or ester thereof is one or more of phthalic acid, phthalic anhydride, dimethyl phthalate, adipic acid, and trimellitic anhydride.
4. The polyester resin according to claim 1, wherein the medium-long chain fatty acid is C8～20The fatty acid of (2).
5. The polyester resin according to claim 4, wherein the medium-long chain fatty acid is in the liquid form C8～20The fatty acid of (2).
6. The polyester resin according to claim 1, wherein the hydroxyl value of the polyester resin is 20 to 40 mgKOH/g.
7. The polyester resin according to claim 6, wherein the hydroxyl value of the polyester resin is 25 to 35 mgKOH/g.
8. A process for producing the polyester resin according to any one of claims 1 to 7, which comprises the steps of: mixing binary/polyhydric alcohol, binary/polybasic carboxylic acid and anhydride or ester thereof, medium-long chain fatty acid and catalyst, and reacting to obtain the polyester resin.
9. The preparation method according to claim 8, wherein the catalyst is one or more of a tin-based catalyst and a titanium-based catalyst.
10. Use of the polyester resin according to any one of claims 1 to 7 for the preparation of a tin printing coating or a coil coating.
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