CN113087888A - Indoor mixed high-speed curing polyester resin and preparation method and application thereof - Google Patents
Indoor mixed high-speed curing polyester resin and preparation method and application thereof Download PDFInfo
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- CN113087888A CN113087888A CN202110453917.7A CN202110453917A CN113087888A CN 113087888 A CN113087888 A CN 113087888A CN 202110453917 A CN202110453917 A CN 202110453917A CN 113087888 A CN113087888 A CN 113087888A
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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
- C08G63/78—Preparation processes
- C08G63/82—Preparation processes characterised by the catalyst used
- C08G63/85—Germanium, tin, lead, arsenic, antimony, bismuth, titanium, zirconium, hafnium, vanadium, niobium, tantalum, or compounds 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
- C08G63/16—Dicarboxylic acids and dihydroxy compounds
- C08G63/18—Dicarboxylic acids and dihydroxy compounds the acids or hydroxy compounds containing carbocyclic rings
- C08G63/181—Acids containing aromatic rings
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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
- C08G63/18—Dicarboxylic acids and dihydroxy compounds the acids or hydroxy compounds containing carbocyclic rings
- C08G63/181—Acids containing aromatic rings
- C08G63/183—Terephthalic acids
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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
- C08G63/78—Preparation processes
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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
- C08G63/91—Polymers modified by chemical after-treatment
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- Polymers & Plastics (AREA)
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- General Chemical & Material Sciences (AREA)
- Paints Or Removers (AREA)
- Polyesters Or Polycarbonates (AREA)
Abstract
The invention provides an indoor mixed high-speed curing polyester resin and a preparation method and application thereof, wherein the polyester resin takes polyalcohol and polybasic acid as raw materials, and adopts a step-by-step catalytic esterification method by introducing proper polyfunctional monomers and using high-efficiency composite esterification catalysts, so that the branching degree and the esterification rate of the polyester resin are effectively improved, and the polyester resin meets the high-speed curing condition; meanwhile, the active crosslinking groups of the polyester resin are reduced, so that the reactive functionality of the polyester resin with a curing agent is improved, the reactive activity of the polyester resin is improved, and the problem of precuring of the polyester resin during high-temperature melt extrusion is solved. The prepared coating has good adhesive force to a base material and good impact resistance and bending performance, and the polyester resin applied to the powder coating can improve the curing rate, is suitable for an intelligent coating production line and a spraying robot, and has very wide application prospect.
Description
Technical Field
The invention belongs to the field of polyester resin preparation, and particularly relates to an indoor mixed type high-speed curing polyester resin, and a preparation method and application thereof.
Background
With the development of economy in China and the development of foreign coating technologies, the coating technologies in China begin to develop rapidly through technical introduction and communication with the foreign technologies, and intelligent coating production lines and spraying robots appear in the aspect of coating automatic production. However, the intelligent coating line and the spraying robot put into use also put higher demands on the production and application of polyester resin, and the market particularly needs a low-cost and economical mixed type polyester resin cured at high speed to prepare powder coating.
The literature reports a plurality of synthetic methods of polyester resin for fast curing powder coating, but the patent reports that high-speed curing type polyester resin is used for TGIC system powder coating, can be cured within 1 minute, and has good performances of leveling, bending, weather resistance and the like of the coating are few. Patents CN102002303A and CN101974280A report an epoxy powder coating, respectively, the curing time is 3 minutes, whether the curing time can be continuously shortened on the premise of ensuring the performance needs to be examined, and the weather resistance of the epoxy system is generally poor. Patent CN101469147A relates to a tribostatic spray-coating infrared curing powder coating for electromagnetic wires and enameled wires, and a preparation method and application thereof, wherein the prepared powder coating is cured by infrared for 2-6 minutes, whether thermal rapid curing is adopted can be realized, and the requirement on rapid curing performance is met. Patent CN102443148A discloses a polyester resin for a rapid-curing weatherable powder coating of beta-hydroxyalkylamide and a preparation method thereof, wherein the curing agent is beta-hydroxyalkylamide, which can be cured at 180 ℃/5-7min, but the curing rate is still low, and the requirements of an intelligent coating line cannot be better met, and if the curing rate is further improved, whether the performances such as bending and weatherproofing can meet the requirements needs to be examined.
Disclosure of Invention
The invention aims to provide an indoor mixed type high-speed curing polyester resin, and a powder coating prepared from the polyester resin has good high-speed curing performance, good adhesive force to a base material and good impact resistance and bending performance.
The invention also aims to provide a preparation method of the indoor mixed type high-speed curing polyester resin, which optimizes the adding sequence and reaction parameters of the raw materials, uses the composite esterification catalyst to ensure that the prepared polyester resin has higher activity and lower softening point, and powder coating prepared by the method can be fully cured at high speed within a certain time. The powder coating prepared from the polyester resin produced by the technology is widely applicable to intelligent coating production lines and spraying robots.
The invention also aims to provide application of the indoor mixed type high-speed curing polyester resin, wherein the prepared high-speed curing polyester resin and the epoxy resin are mixed in a specific ratio, and the ethyl triphenyl phosphonium bromide curing accelerator is added to replace the traditional quaternary ammonium salt accelerator, so that the prepared coating can be cured at a high speed.
The specific technical scheme of the invention is as follows:
an indoor mixed type high-speed curing polyester resin comprises the following raw materials in parts by weight:
100 portions of polyhydric alcohol, 250 portions of acid, 150 portions of esterification catalyst, 1.5 to 2.5 portions of curing accelerator and 3 to 5 portions of curing accelerator;
the polyalcohol is one or more of neopentyl glycol, 1, 3-propylene glycol, 2-methyl-1, 3-propylene glycol, 1, 4-butanediol, 1, 3-butanediol, 1, 6-hexanediol, diethylene glycol, dipropylene glycol or triethylene glycol.
Preferably, the polyol is neopentyl glycol, 1, 3-propanediol, 2-methyl-1, 3-propanediol, and more preferably the polyol is neopentyl glycol.
The acid is selected from terephthalic acid, isophthalic acid, phthalic acid and naphthalene dicarboxylic acid; or the acid is trimellitic anhydride, pyromellitic acid and 1, 3, 5-trimellitic acid.
Preferably, the acid is selected from the group consisting of terephthalic acid, isophthalic acid, phthalic acid, trimellitic anhydride and 1, 3, 5-trimellitic acid.
The esterification catalyst is a composite esterification catalyst which is a titanium-tin bimetallic ion catalyst and is prepared by using delta-Al2O3And (4) loading. The preparation method comprises mixing delta-Al2O3Placing the mixture into a solution containing titanium ions and tin ions for dipping treatment, roasting, and then heating the mixture in a reducing atmosphere for reduction reaction to obtain the composite esterification catalyst. Compared with the existing esterification catalyst, the catalyst is delta-Al2O3The supported titanium-tin bimetallic catalyst has high catalytic efficiency, but the titanium salt and the tin salt are homogeneous catalysts, the post-treatment is complex after the catalytic esterification reaction, the delta-Al 2O3 is used as a carrier to support the titanium salt and the tin salt, the advantages of the two catalysts with high catalytic efficiency can be combined, the supported catalyst is a heterogeneous catalyst, and the catalyst can be continuously recycled after the catalytic esterification reaction is finished through filtration, cleaning and grinding, so that the raw material cost is saved; secondly, the surface particles of the esterification catalyst obtained by adopting delta-Al 2O3 as a carrier for loading are in a nanometer level, the surface area is larger, the stability is better, the activity is higher, and the catalytic activity is improved; thirdly, the esterification catalyst is nontoxic and harmless, and does not corrode a metal reaction kettle.
The curing accelerator is ammonium salt and phosphonium salt, preferably ethyl triphenyl phosphonium bromide or isopropyl triphenyl phosphonium bromide.
The invention provides a preparation method of an indoor mixed type high-speed curing polyester resin, which comprises the following steps:
(1) the first stage is as follows: adding the acid with the formula amount into a reaction kettle, adding 50% of alcohol and 50% of composite esterification catalyst with the formula amount under the stirring condition, sealing the kettle, and heating for reaction;
(2) and a second stage: adding the rest alcohol and the composite esterification catalyst in the formula amount, and reacting at the temperature of 200-300 ℃;
(3) and a third stage: then, reacting at 150-250 ℃, adding isophthalic acid for end capping after first vacuum concentration, and performing second vacuum concentration until the acid value is 30-60 mgKOH/g and the viscosity is 50-80mpa.s/175 ℃; the molecular weight of the polyester resin is controlled to 5000-.
(4) A fourth stage: and finally, controlling the temperature of the kettle at 150-.
Effective effect
By introducing proper polyfunctional monomer and using high-efficiency composite esterification catalyst, the branching degree of the polyester resin is effectively improved and the esterification rate is improved by adopting a step-by-step catalytic esterification method, so that the polyester resin meets the condition of high-speed curing; meanwhile, the active crosslinking groups of the polyester resin are reduced, so that the reactive functionality of the polyester resin with a curing agent is improved, the reactive activity of the polyester resin is improved, and the problem of precuring of the polyester resin during high-temperature melt extrusion is solved. The prepared high-speed curing polyester resin and epoxy resin are mixed according to a specific mixing ratio, and the ethyl triphenyl phosphonium bromide curing accelerator is added to replace the traditional quaternary ammonium salt accelerator, so that the prepared coating can be cured at a high speed.
Detailed Description
Example 1: preparation of composite esterification catalyst 1
Mixing 1mol of titanium tetrachloride, 0.5mol of stannic chloride and 500ml of water to prepare a mixed salt solution, and adding spherical delta-Al2O3Soaking the carrier for 24h, evaporating the carrier to dryness, and roasting in a muffle furnace at 700 ℃ for 8h to obtain the modified Ti-Sn/delta-Al2O3Catalyst precursor, and then mixing the catalyst precursor and the catalyst precursor in a volume ratio of 1: 5H2/N2Reducing for 6 hours at 300 ℃ in mixed atmosphere to obtain the composite esterification catalyst Ti-Sn/delta-Al2O3Catalyst 1.
Example 2: preparation of composite esterification catalyst 2
Mixing 1mol of titanium tetrachloride and 1mol of stannic chloride with 500ml of water to prepare a mixed salt solution, and adding spherical delta-Al2O3Soaking the carrier for 24h, evaporating the carrier to dryness, and roasting in a muffle furnace at 700 ℃ for 8h to obtain the modified Ti-Sn/delta-Al2O3The amount of the catalyst precursor is such that,then, the volume ratio of the mixture is 1: 5H2/N2Reducing for 6 hours at 300 ℃ in mixed atmosphere to obtain the composite esterification catalyst Ti-Sn/delta-Al2O3Catalyst 2.
Example 3: preparation of composite esterification catalyst 3
Mixing 1mol of titanium tetrachloride, 0.75mol of stannic chloride and 500ml of water to prepare a mixed salt solution, and adding spherical delta-Al2O3Soaking the carrier for 24h, evaporating the carrier to dryness, and roasting in a muffle furnace at 700 ℃ for 8h to obtain the modified Ti-Sn/delta-Al2O3Catalyst precursor, and then mixing the catalyst precursor and the catalyst precursor in a volume ratio of 1: 5H2/N2Reducing for 6 hours at 300 ℃ in mixed atmosphere to obtain the composite esterification catalyst Ti-Sn/delta-Al2O3Catalyst 3.
Example 4: preparation of composite esterification catalyst 4
Mixing 1mol of titanium tetrachloride, 0.8mol of stannic chloride and 500ml of water to prepare a mixed salt solution, and adding spherical delta-Al2O3Soaking the carrier for 24h, evaporating the carrier to dryness, and roasting in a muffle furnace at 700 ℃ for 8h to obtain the modified Ti-Sn/delta-Al2O3Catalyst precursor, and then mixing the catalyst precursor and the catalyst precursor in a volume ratio of 1: 5H2/N2Reducing for 6 hours at 300 ℃ in mixed atmosphere to obtain the composite esterification catalyst Ti-Sn/delta-Al2O3Catalyst 4.
Example 5: preparation of composite esterification catalyst 5
Mixing 1mol of titanium tetrachloride, 0.6mol of stannic chloride and 500ml of water to prepare a mixed salt solution, and adding spherical delta-Al2O3Soaking the carrier for 24h, evaporating the carrier to dryness, and roasting in a muffle furnace at 700 ℃ for 8h to obtain the modified Ti-Sn/delta-Al2O3Catalyst precursor, and then mixing the catalyst precursor and the catalyst precursor in a volume ratio of 1: 5H2/N2Reducing for 6 hours at 300 ℃ in mixed atmosphere to obtain the composite esterification catalyst Ti-Sn/delta-Al2O3Catalyst 5.
Example 6: preparation of indoor-mixing type high-speed curing polyester resin 6
(1) The first stage is as follows: putting 150Kg of terephthalic acid and 100Kg of water into a reaction kettle, adding 50Kg of neopentyl glycol and 0.75Kg of the composite esterification catalyst 1 prepared in the embodiment 1 under the stirring condition, sealing the kettle, heating and reacting at the temperature of 130-160 ℃ for 2 hours;
(2) and a second stage: then 50Kg of neopentyl glycol and 0.75Kg of the composite esterification catalyst 1 prepared in example 1 are added and reacted for 3 hours at the temperature of 200-300 ℃;
(3) and a third stage: then, carrying out first vacuum polycondensation at the temperature of 200-250 ℃ until the acid value is 10-20mgKOH/g, then adding 3.5kg of acid hydrolysis agent isophthalic acid for end capping, and when the acid value reaches 70-80mgKOH/g, carrying out second vacuum pumping for acid hydrolysis reaction to obtain polyester resin with the viscosity of 60-80mpa.s/175 ℃; the molecular weight of the polyester resin is 10000-.
(4) A fourth stage: and finally, controlling the temperature of the kettle at 150-.
Examples 7 to 10: preparation of indoor mixing type high-speed curing polyester resin 7-10
The preparation method of example 6 was followed, and composite esterification catalyst 2-5 prepared in examples 2-5 was used as the composite esterification catalyst.
Example 11: preparation of indoor-mix type high-speed curing polyester resin 11
(1) The first stage is as follows: putting 200Kg of terephthalic acid and 150Kg of water into a reaction kettle, adding 75Kg of neopentyl glycol and 1.0Kg of the composite esterification catalyst 1 prepared in the embodiment 1 under the stirring condition, sealing the kettle, heating and reacting at the temperature of 150-170 ℃, and reacting for 1.5 h;
(2) and a second stage: then adding 75Kg of neopentyl glycol and 1.0Kg of the composite esterification catalyst 1 prepared in the embodiment 1, and reacting for 3 hours at the temperature of 200-300 ℃;
(3) and a third stage: then, carrying out first vacuum polycondensation at the temperature of 200-250 ℃ until the acid value is 15-25mgKOH/g, then adding 5.0kg of acid hydrolysis agent isophthalic acid for end capping, and when the acid value reaches 60-70mgKOH/g, carrying out second vacuum pumping for acid hydrolysis reaction to obtain polyester resin with the viscosity of 55-70mpa.s/175 ℃; the molecular weight of the polyester resin is 10000-.
(4) A fourth stage: and finally, controlling the temperature of the kettle at 150-.
Examples 12 to 15: preparation of indoor-mixing type high-speed curing polyester resin 12-15
The preparation method of example 11 was followed, and composite esterification catalyst 2-5 prepared in examples 2-5 was used as the composite esterification catalyst.
Comparative example 1: preparation of cured polyester resins
(1) The first stage is as follows: putting 150Kg of terephthalic acid and 100Kg of water into a reaction kettle, adding 50Kg of neopentyl glycol and 0.75Kg of monobutyl dihydroxy tin chloride under the stirring condition, sealing the kettle, heating and reacting at the temperature of 130-160 ℃, and reacting for 2 hours;
(2) and a second stage: then 50Kg of neopentyl glycol and 0.75Kg of monobutyl dihydroxy tin chloride are added to react for 3 hours at the temperature of 200-300 ℃;
(3) and a third stage: then, under the condition of 200-250 ℃, carrying out first vacuum polycondensation till the acid value is 10-20mgKOH/g, then adding 3.5kg of acid hydrolysis agent isophthalic acid for end capping, when the acid value reaches 70-80mgKOH/g, carrying out second vacuum pumping for acid hydrolysis reaction to obtain the polyester resin with the viscosity of 200-260mpa.s/175 ℃.
(4) A fourth stage: and finally, controlling the temperature of the kettle at 150-. Comparative example 2: preparation of cured polyester resins
(1) The first stage is as follows: putting 150Kg of terephthalic acid and 100Kg of water into a reaction kettle, adding 50Kg of neopentyl glycol and 0.75Kg of isopropyl titanate under the stirring condition, sealing the kettle, heating and reacting at the temperature of 130-160 ℃ for 2 h;
(2) and a second stage: then 50Kg of neopentyl glycol and 0.75Kg of isopropyl titanate are added and reacted for 3 hours at the temperature of 200-300 ℃;
(3) and a third stage: then, under the condition of 200-250 ℃, carrying out first vacuum polycondensation till the acid value is 10-20mgKOH/g, then adding 3.5kg of acid hydrolysis agent isophthalic acid for end capping, when the acid value reaches 70-80mgKOH/g, carrying out second vacuum pumping for acid hydrolysis reaction to obtain the polyester resin with the viscosity of 300-330mpa.s/175 ℃.
(4) A fourth stage: and finally, controlling the temperature of the kettle at 150-. Comparative example 3: preparation of cured polyester resins
Putting 150Kg of terephthalic acid and 100Kg of water into a reaction kettle, adding 100Kg of neopentyl glycol and 1.5Kg of the composite esterification catalyst 1 prepared in the embodiment under the stirring condition, sealing the kettle, heating for reaction at 200-250 ℃ for 2h, carrying out first vacuum polycondensation until the acid value is 10-20mgKOH/g, then adding 3.5Kg of acid hydrolysis agent isophthalic acid for end capping, and carrying out second vacuum-pumping for acidolysis reaction when the acid value reaches 70-80mgKOH/g to obtain the polyester resin with the viscosity of 180-220mpa.s/175 ℃. And finally, controlling the temperature of the kettle at 150-.
Example 16: performance testing
The high-speed curing polyester resin prepared by the methods of examples 6-15 and the curing polyester resin prepared by the comparative examples 1-3 are respectively applied to powder coating, and the application process comprises the steps of uniformly mixing the polyester resin, the epoxy resin, the curing agent, the titanium dioxide and the silicon micropowder according to the ratio of 50:50:15:15:3, extruding and tabletting through a double-screw extruder, cooling, crushing, sieving and electrostatic spraying. The coating is subjected to a performance test according to the national standard, the gel time is tested according to GB/T16942-.
Table 1: performance testing of coatings prepared from polyester resins
The test result shows that the coating has good adhesive force to the base material and good impact resistance and bending performance, and the polyester resin can be cured at high speed when being applied to the powder coating, is suitable for an intelligent coating production line and has very wide application prospect.
Claims (10)
1. An indoor mixed type high-speed curing polyester resin is characterized by comprising the following raw materials in parts by weight:
100 portions of polyhydric alcohol, 250 portions of acid, 150 portions of esterification catalyst, 1.5 to 2.5 portions of curing accelerator and 3 to 5 portions of curing accelerator;
the polyalcohol is one or a mixture of more of neopentyl glycol, 1, 3-propylene glycol, 2-methyl-1, 3-propylene glycol, 1, 4-butanediol, 1, 3-butanediol, 1, 6-hexanediol, diethylene glycol, dipropylene glycol or triethylene glycol;
the acid is selected from terephthalic acid, isophthalic acid, phthalic acid and naphthalene dicarboxylic acid; or the acid is trimellitic anhydride, pyromellitic acid and 1, 3, 5-trimellitic acid.
2. The indoor hybrid high rate cure polyester resin of claim 1, wherein said polyol is neopentyl glycol, 1, 3-propanediol, 2-methyl-1, 3-propanediol.
3. The indoor hybrid high rate cure polyester resin of claim 1, wherein said polyol is neopentyl glycol.
4. The indoor hybrid high speed cure polyester resin according to claim 1, wherein said acid is selected from the group consisting of terephthalic acid, isophthalic acid, phthalic acid, trimellitic anhydride, and 1, 3, 5-trimellitic acid.
5. The indoor hybrid high rate cure polyester resin of claim 1, wherein said esterification catalyst is a composite esterification catalyst which is a titanium-tin bi-metal ion catalyst, as measured by delta-Al2O3And (4) loading.
6. The indoor hybrid high rate cure polyester resin of claim 5 wherein the hybrid esterification catalyst is prepared by reacting delta-Al2O3Placing the mixture into a solution containing titanium ions and tin ions for dipping treatment, roasting, and then heating the mixture in a reducing atmosphere for reduction reaction to obtain the composite esterification catalyst.
7. An indoor hybrid high rate curing polyester resin according to claim 1 characterized in that said cure accelerator is an ammonium salt and a phosphonium salt, preferably ethyltriphenylphosphonium bromide or isopropyltriphenylphosphonium bromide.
8. The method of making an indoor hybrid high rate cure polyester resin of claim 1 comprising the steps of:
(1) the first stage is as follows: adding the acid with the formula amount into a reaction kettle, adding 50% of alcohol and 50% of composite esterification catalyst with the formula amount under the stirring condition, sealing the kettle, and heating for reaction;
(2) and a second stage: adding the rest alcohol and the composite esterification catalyst in the formula amount, and reacting at the temperature of 200-300 ℃;
(3) and a third stage: then reacting at 150-250 ℃, adding isophthalic acid for end capping after first vacuum concentration, and performing second vacuum concentration until the acid value is 30-60 mgKOH/g and the viscosity is 50-80mpa.s/175 ℃; the molecular weight of the polyester resin is controlled to 5000-;
(4) a fourth stage: and finally, controlling the temperature of the kettle at 150-.
9. Use of an indoor hybrid type high speed curing polyester resin according to claim 1 wherein the coating is prepared by mixing the prepared indoor hybrid type high speed curing polyester resin with an epoxy resin and adding an ethyl triphenyl phosphonium bromide curing accelerator.
10. Use of an indoor hybrid high rate cure polyester resin according to claim 9, characterized in that the weight ratio of polyester resin to epoxy resin is 50: 50.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113861813A (en) * | 2021-10-29 | 2021-12-31 | 倪春燕 | Cured polyester resin coating and preparation method thereof |
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| CN103240071A (en) * | 2013-05-21 | 2013-08-14 | 卡松科技有限公司 | Preparation method of esterification catalyst and base oil of lubricant |
| CN104277208A (en) * | 2014-10-31 | 2015-01-14 | 安徽神剑新材料股份有限公司 | Low-temperature setting polyester resin |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103240071A (en) * | 2013-05-21 | 2013-08-14 | 卡松科技有限公司 | Preparation method of esterification catalyst and base oil of lubricant |
| CN104277208A (en) * | 2014-10-31 | 2015-01-14 | 安徽神剑新材料股份有限公司 | Low-temperature setting polyester resin |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113861813A (en) * | 2021-10-29 | 2021-12-31 | 倪春燕 | Cured polyester resin coating and preparation method thereof |
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