CN113105612B - 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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- CN113105612B CN113105612B CN202110217413.5A CN202110217413A CN113105612B CN 113105612 B CN113105612 B CN 113105612B CN 202110217413 A CN202110217413 A CN 202110217413A CN 113105612 B CN113105612 B CN 113105612B
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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
-
- 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 wet-on-wet technology, 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 dihydric/polyhydric 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 dicarboxylic acid/polybasic carboxylic acid and derivatives thereof, so that the polyester resin is endowed with good affinity to the base coat with various colors, the polyester resin can be directly constructed under the condition that the base coat is not dried and solidified, and the base coat is free from dissolution and rejection phenomena, thereby realizing 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 capable of being used for a wet-on-wet process, and a preparation method and application thereof.
Background
Polyester resins are generally polymerized by condensation (or transesterification) of an organic di/polycarboxylic acid (anhydride or ester) with a di or polyol. Polyester resin has excellent adhesive force to metal base material and is widely used in preparing amino baking paint type iron printing paint and coiled material paint. Such coatings generally require a primer to provide good adhesion to the substrate and a top coat/gloss oil to further provide protective and decorative properties such as weatherability.
Amino baking lacquers require curing at high temperatures, typically after the primer is cured, the ink is applied to cure and the topcoat/gloss oil is applied to further bake cure. The wet-on-wet process refers to that after the primer is coated, the printing ink is coated, the varnish is directly coated without drying, and the primer is baked and cured once. The gloss oil prepared by the common amino/polyester resin system is directly coated on the unbaked and solidified ink, and the ink and the gloss oil permeate or agglomerate and shrink, so that the dry film is light-lost, the boundary of the pattern is fuzzy and even the bottom is exposed, and therefore, the requirements of wet-on-wet process cannot be met.
The high-temperature curing of the iron printing coating and the coiled material coating is carried out, the heat supply fuel and the labor cost are main cost, and the wet-on-wet process can reduce one-time baking and can effectively reduce the cost. The development of the paint resin suitable for wet-on-wet technology has important practical and economic significance for energy conservation, environmental protection and cost saving.
The prior art of iron printing coating mainly adopts epoxy ester resin to realize wet-on-wet technology. However, the price of epoxy resin is relatively high, and free bisphenol A is limited by some legal laws, and acrylic resin is currently adopted as the main material of wet-on-wet gloss oil. The wet-on-wet effect of the acrylic resin gloss oil is relatively general, the hydroxyl groups of the curing functional groups of the acrylic resin are unevenly distributed, and a higher hydroxyl value is required to meet the curing performance, so that the gloss oil is insufficient in tensile performance, and can only be used in occasions with low processing performance. The hydroxyl groups of the polyester resin are distributed at the tail ends of molecules, the crosslinked structure is regular, the flexibility and the hardness are easy to balance, the comprehensive performance is excellent, but the wet-on-wet effect is poorer.
At present, research on improving and optimizing the characteristic of polyester resin is carried out, for example, patent CN110938363A discloses a scheme for preparing a wet-on-wet high-performance aqueous polyurethane finishing paint by compounding hydroxyl acrylic resin and polyester resin, but the research is relatively lack.
Therefore, the development of a polyester resin that can be used in wet-on-wet processes has significant research and economic value.
Disclosure of Invention
The invention aims to overcome the defect or defect of poor wet-on-wet effect of polyester resin in the prior art and provides polyester resin which can be used for 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 is endowed with good affinity to the base coat with various colors, the polyester resin can be directly constructed under the condition that the base coat is not dried and solidified, and the polyester resin has no dissolution and rejection phenomena to the base coat, thereby realizing a wet-on-wet process.
Another object of the present invention is to provide a method for producing the above polyester resin.
It is another object of the present invention to provide the use of the above polyester resin for the preparation of iron printing coatings or coil coatings.
In order to achieve the aim of the invention, the invention adopts the following technical scheme:
the polyester resin for the wet-on-wet process comprises the following components in parts by weight:
100 parts of a dihydric/polyhydric alcohol,
130 to 135 parts of di/poly carboxylic acid and anhydride or ester thereof,
45-55 parts of medium-long chain fatty acid.
The inventor of the invention finds through repeated research that medium-long chain fatty acid is introduced into a polyester system to replace original dicarboxylic acid/polycarboxylic acid and derivatives thereof (dicarboxylic acid/polycarboxylic acid and anhydride or ester thereof), so that the surface tension of polyester resin is reduced, and the affinity of the polyester resin to the base coat of various colors is improved; the usage amount of the medium-long chain fatty acid has a great influence on the affinity and other properties of the polyester resin, for example, the usage amount of the medium-long chain fatty acid is too small, the improvement on the affinity is not obvious, and the gloss oil wet-on-wet effect prepared from the obtained polyester resin is poor; if the amount of the medium-long chain fatty acid is large, the gloss oil coating prepared from the obtained polyester resin is softer, so that the coating is easy to scratch, and serious even plate surface adhesion is caused. The polyester resin has good affinity to the base coat with various colors by selecting the medium-long chain fatty acid with proper dosage, can be directly constructed under the condition that the base coat is not dried and solidified, has no dissolution and rejection phenomena to the base coat, and realizes the wet-on-wet process.
It should be understood that the diols/polyols are represented by either diols or polyols (triols, tetrols, etc.), or by a mixture of diols or polyols.
Similarly, di/polycarboxylic acids and anhydrides or esters thereof refer to any one or more of the classes of dicarboxylic acids, dicarboxylic anhydrides, dicarboxylic esters, polycarboxylic acids, polybasic anhydrides, polybasic acid esters.
Under the formula condition of the invention, the content of the medium-long chain fatty acid is 20-25%.
Di/polyols, di/polycarboxylic acids and anhydrides or esters 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/poly carboxylic acid and its anhydride or ester is one or more of phthalic acid, phthalic anhydride, dimethyl benzene, adipic acid or trimellitic anhydride.
Preferably, the medium-long chain fatty acid is C 8～20 Fatty acids of (C), e.g. isooctanoic acid, isononanoic acid, lauric acid, coconut acid, bean acid, dehydrated ricinoleic acid, stearic acid, etc
More preferably, the medium-long chain fatty acid is liquid C 8～20 For example, isooctanoic acid, isononanoic acid, coconut oleic acid, bean oleic acid, dehydrated ricinoleic acid, and the like.
It should be understood that liquid C 8～20 Refers to C which is liquid at normal temperature 8～20 Is a fatty acid of (a). The liquid fatty acid has irregular structure compared with 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 40mgKOH/g.
The hydroxyl value of the polyester resin has a certain influence on the performance, for example, the hydroxyl value is too high, the molecular weight is low, more amino curing agent is 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 paint film hardness is poor.
More preferably, the hydroxyl value of the polyester resin is 25 to 35mgKOH/g.
Preferably, the polyester resin further comprises a solvent (e.g., ethylene glycol monobutyl ether, propylene glycol methyl ether acetate, isophorone, 100# solvent oil, 150# solvent oil, etc.).
The polyester resin may be adjusted to a specific solids content (e.g., 40-75%) using a solvent; meanwhile, after reasonable dilution, the leveling property and stability of the product can be improved.
The preparation method of the polyester resin comprises the following steps: mixing the binary/polyhydric alcohol, the binary/polybasic carboxylic acid and anhydride or ester thereof, the medium-long chain fatty acid and the catalyst, and reacting to obtain the polyester resin.
Preferably, the catalyst is one or more of tin-based catalysts (such as monobutyl tin oxide, stannous octoate) and titanium-based catalysts, which are commercially available.
Preferably, the polyester resin is prepared by the following process: mixing the dihydric/polyhydric alcohol, the dihydric/polyhydric carboxylic acid and anhydride or ester thereof and the medium-long chain fatty acid, heating to 80-120 ℃, adding a catalyst, continuously heating, controlling the temperature of the distillate to be not more than 100 ℃, slowly heating to 210-250 ℃, and preserving heat; after the temperature of the distillate is reduced to below 80 ℃, the reaction materials are taken for observation, the reaction materials are completely uniform and transparent, then the reflux solvent is added for reflux, and when the acid value reaches a set index (for example, 0 to 10, preferably 0 to 5), the target solvent resin is diluted by the solvent.
The application of the polyester resin in preparing the metal printing paint or the coiled material paint 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 dicarboxylic acid/polybasic carboxylic acid and derivatives thereof, so that the polyester resin is endowed with good affinity to the base coat with various colors, the polyester resin can be directly constructed under the condition that the base coat is not dried and solidified, and the base coat is free from dissolution and rejection phenomena, thereby realizing a wet-on-wet process.
Detailed Description
The invention is further illustrated below with reference to examples. These examples are only for illustrating the present invention and are not intended to limit the scope of the present invention. The experimental procedures in the examples below, without specific details, are generally performed under conditions conventional in the art or recommended by the manufacturer; the raw materials, reagents and the like used, unless otherwise specified, are those commercially available from conventional markets and the like. Any insubstantial changes and substitutions made by those skilled in the art in light of the above teachings are intended to be within the scope of the invention as claimed.
Example 1
The example provides a polyester resin with 20% fatty acid content, which is prepared by the following process.
Into a transparent reaction vessel were charged 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. Heating to 100 ℃, adding 0.30g of catalyst monobutyl tin oxide, and starting stirring. Continuing to heat, controlling the temperature of the distillate to be less than 94 ℃. And (5) heating to 220-230 ℃ and preserving heat. After the material is transparent and the temperature of the distillate is reduced to 70 ℃, 21.40g of dimethylbenzene is added, the temperature is maintained at 210-220 ℃, reflux dehydration is carried out, the acid value is tested every 1 hour, when the acid value is less than 5mgKOH/g, 306.52g of 150# solvent oil (aromatic hydrocarbon mixture at 180-210 ℃) and 32.08g of ethylene glycol monobutyl ether are added, and stirring is carried out uniformly. And cooling to 120 ℃ and discharging. 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%, which is prepared by the following process.
Into a transparent reaction vessel was charged 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. Heating to 100 ℃, adding 0.30g of catalyst monobutyl tin oxide, and starting stirring. Continuing to heat, controlling the temperature of the distillate to be less than 94 ℃. And (5) heating to 220-230 ℃ and preserving heat. After the material is transparent and the temperature of the distillate is reduced to 70 ℃, 21.33g of dimethylbenzene is added, the temperature is maintained at 210-220 ℃, reflux dehydration is carried out, the acid value is tested every 1 hour, when the acid value is less than 5mgKOH/g, 306.52g of 150# solvent oil and 32.08g of ethylene glycol monobutyl ether are added, and stirring is uniform. And cooling to 120 ℃ and discharging. 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
The comparative example provides a polyester resin having a fatty acid content of 0, which is prepared by the following process.
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. Heating to 100 ℃, adding 0.30g of catalyst monobutyl tin oxide, and starting stirring. Continuing to heat, controlling the temperature of the distillate to be less than 94 ℃. And (5) heating to 220-230 ℃ and preserving heat. After the material is transparent and the temperature of the distillate is reduced to 70 ℃, 21.0g of dimethylbenzene is added, the temperature is maintained at 210-220 ℃, 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 150# solvent oil is added and stirred uniformly. And cooling to 120 ℃ and discharging. The theoretical hydroxyl value of the obtained product is 30.03mgKOH/g, color number <1# (Fe-Co), acid value is 2.33mgKOH/g, viscosity is 7500mpas/25 ℃, and solid content is 59.45%.
Comparative example 2
This example provides a polyester resin having a fatty acid content of 15%, which is prepared by the following process.
Into a transparent reaction vessel was charged 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. Heating to 100 ℃, adding 0.30g of catalyst monobutyl tin oxide, and starting stirring. Continuing to heat, controlling the temperature of the distillate to be less than 94 ℃. And (5) heating to 220-230 ℃ and preserving heat. After the material is transparent and the temperature of the distillate is reduced to 70 ℃, 21.50g of dimethylbenzene is added, the temperature is maintained at 210-220 ℃, reflux dehydration is carried out, the acid value is tested every 1 hour, and when the acid value is less than 5mgKOH/g, 307.11g of 150# solvent oil and 32.24g of ethylene glycol monobutyl ether are added and stirred uniformly. And cooling to 120 ℃ and discharging. 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, the steel plate is coated with the base coat, dried and solidified, the printing ink with different colors is coated on the roller coating under the condition of no drying, and then the steel plate is dried. The wet-on-wet is bad, the wet film which is not dried and solidified has shrinkage, even has open bottom, the color is mutually penetrated (ink dissolution phenomenon), even has open bottom; the color of the coating film after curing is mutually interfered, the pattern is blurred, the light is lost, and even the bottom is exposed when serious.
Laboratory tests are carried out, wherein various colors of printing ink are generally pulled on a steel plate after the precoating and the priming and curing, under the condition that the steel plate is not baked, the wet-on-wet gloss oil is pulled on by using a pull rod, whether the wet film is shrunk or even exposed, whether the colors are mutually penetrated or not is observed, and then the steel plate is dried, whether the colors are mutually interfered or not, whether the patterns are fuzzy or not and whether some parts are exposed or not is further observed.
The coating was prepared according to the following coating formulation:
65% of the polyester resins prepared in each of the examples and comparative examples,
10% of the methylated amino resin is used for preparing the catalyst,
10% of isophorone of the formula I,
15% of 150# solvent oil,
0.2% of BYK110 defoamer,
0.2% BYK310 leveling agent.
Coating the steel plate with the precoated primer with 10# pull rod to form commercial alkyd iron printing ink with various colors, leveling for 5 minutes, using 10# pull rod to hike the coating, observing for 10 minutes, and putting into an oven to bake for 10-15 minutes. The actual production showed that yellow and black inks were relatively difficult to wet, and the following experiments were conducted with yellow, black and red inks as wet tests, the results of which are 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-soluble ink | Non-soluble ink | Slightly soluble ink | Non-soluble ink |
| Red ink dry film | No abnormality | No abnormality | Light-loss | No abnormality |
| Black ink wet film | Non-soluble ink | Non-soluble ink | Yan Chongrong ink, exposed bottom | Slightly soluble ink |
| Black ink dry film | No abnormality | No abnormality | Local exposed bottom | Light-loss |
| Yellow ink wet film | Non-soluble ink | Non-soluble ink | Yan Chongrong inkExposed bottom | Ink dissolving |
| Yellow ink wet film | No abnormality | No abnormality | Local exposed bottom | Pattern boundary blurring |
As can be seen from Table 1, the polyester resins of the examples of the present invention have good affinity for various color base coats, can be directly applied without drying and curing the base coats, and have no dissolution or rejection phenomenon for the base coats, thereby realizing wet-on-wet processes. However, neither medium-long chain fatty acid (e.g., comparative example 1) nor medium-long chain fatty acid (e.g., comparative example 2) was added in too small an amount to achieve a good wet-on-wet process.
Those of ordinary skill in the art will recognize that the embodiments herein are intended to assist the reader in understanding the principles of the invention and should be understood that the scope of the invention is not limited to such specific statements and embodiments. Those of ordinary skill in the art can make various other specific modifications and combinations from the teachings of the present disclosure without departing from the spirit thereof, and such modifications and combinations remain within the scope of the present disclosure.
Claims (6)
1. The polyester resin for the wet-on-wet process is characterized by comprising the following components in parts by weight:
100 parts of a dihydric/polyhydric alcohol,
130-135 parts of di/poly carboxylic acid and anhydride or ester thereof,
45-55 parts of medium-long chain fatty acid;
the dihydric/polyhydric alcohol is neopentyl glycol and propylene glycol;
the di/poly carboxylic acid and its anhydride or ester are terephthalic acid, isophthalic acid and trimellitic anhydride;
the medium-long chain fatty acid is C 8~20 Fatty acids of (a); the content of the medium-long chain fatty acid in the polyester resin is 20-25%; the hydroxyl value of the polyester resin is 20-40 mgKOH/g.
2. The polyester resin according to claim 1, wherein the medium-long chain fatty acid is liquid C 8~20 Is a fatty acid of (a).
3. The polyester resin according to claim 1, wherein the hydroxyl value of the polyester resin is 25 to 35mgKOH/g.
4. A method for producing a polyester resin according to any one of claims 1 to 3, comprising the steps of: mixing the binary/polyhydric alcohol, the binary/polybasic carboxylic acid and anhydride or ester thereof, the medium-long chain fatty acid and the catalyst, and reacting to obtain the polyester resin.
5. The method according to claim 4, wherein the catalyst is one or more of tin-based catalyst and titanium-based catalyst.
6. Use of the polyester resin according to any one of claims 1 to 3 for the preparation of iron printing coatings or coil coatings.
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1342198A (en) * | 1972-04-21 | 1973-12-25 | Whittaker Corp | Preparation of polyester resins and polyester resins so prepared |
| CN107417894A (en) * | 2017-05-19 | 2017-12-01 | 江苏三木化工股份有限公司 | A kind of coil finish paint alkyd resin and preparation method |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4115948A1 (en) * | 1991-05-16 | 1992-11-19 | Basf Lacke & Farben | Coating compsn. for forming metal-pigmented base coat - for clear top coat in wet-on-wet process contains polyurethane or polyurea elastomer, polyester, and etherified aminoplast polycondensate |
| JP4407728B2 (en) * | 2007-08-07 | 2010-02-03 | Ｂａｓｆコーティングスジャパン株式会社 | Multi-layer coating formation method |
| CN102516511B (en) * | 2011-11-14 | 2014-06-18 | 中国电器科学研究院有限公司 | Polyester resin for high-performance aqueous coating and preparation method thereof |
| CN112175459B (en) * | 2019-07-03 | 2022-03-15 | 立邦涂料（中国）有限公司 | Varnish coating composition and application thereof |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1342198A (en) * | 1972-04-21 | 1973-12-25 | Whittaker Corp | Preparation of polyester resins and polyester resins so prepared |
| CN107417894A (en) * | 2017-05-19 | 2017-12-01 | 江苏三木化工股份有限公司 | A kind of coil finish paint alkyd resin and preparation method |
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