CN113087888B - Indoor mixed high-speed cured polyester resin and preparation method and application thereof - Google Patents
Indoor mixed high-speed cured polyester resin and preparation method and application thereof Download PDFInfo
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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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Abstract
The invention provides an indoor mixed high-speed cured polyester resin, a preparation method and application thereof, wherein the polyester resin takes polyalcohol and polybasic acid as raw materials, and adopts a stepwise catalytic esterification method to effectively improve the branching degree and the esterification rate of the polyester resin by introducing proper polyfunctional monomers and using an efficient composite esterification catalyst, so that the polyester resin meets the condition of high-speed curing; meanwhile, the reactive crosslinking groups of the polyester resin are reduced, so that the functionality capable of reacting with the curing agent is improved, the reactivity of the polyester resin is improved, and the problem that the polyester resin is pre-cured during high-temperature melt extrusion is solved. The prepared coating has good adhesive force to a substrate and good impact resistance and bending performance, and the polyester resin can improve the curing rate when applied to powder coating, is suitable for intelligent coating production lines and spraying robots, and has very broad application prospects.
Description
Technical Field
The invention belongs to the field of preparation of polyester resins, and particularly relates to an indoor mixed high-speed cured polyester resin, and a preparation method and application thereof.
Background
Along with the development of the economy in China and the development of the foreign coating technology, the technology in China starts to develop rapidly through the introduction and communication of the technology with the foreign technology, and an intelligent coating production line and a spraying robot are arranged in the aspect of coating automatic production. However, the intelligent coating production line and the spraying robot put into use also put higher demands on the production and application of polyester resin, and the market at present particularly needs a low-cost and economical mixed high-speed cured polyester resin to prepare the powder coating.
Some synthetic methods of polyester resin for fast curing powder coating are reported in the literature, but the high-speed curing polyester resin is used for TGIC system powder coating, can be cured in a short time of 1 minute, and has few patent reports on good leveling, bending, weather resistance and the like of coating. Patent CN102002303A, CN101974280a reports that an epoxy powder coating has a curing time of 3 minutes, and whether the curing time is continuously shortened under the premise of ensuring performance is still to be checked, and the weather resistance of an epoxy system is generally poor. Patent CN101469147A relates to friction electrostatic spraying infrared curing powder coating for electromagnetic wires and enamelled wires, a preparation method and application thereof, and whether the prepared powder coating is cured for 2-6 minutes by infrared curing can be judged by adopting heat to cure rapidly and meets the requirements of rapid curing performance. Patent CN102443148A discloses a polyester resin for quick curing weather-resistant powder coating of beta-hydroxyalkylamide and a preparation method thereof, wherein the curing agent is beta-hydroxyalkylamide, and can be cured under the condition of 180 ℃/5-7min, but the curing rate is still low, so that the requirements of an intelligent coating line cannot be better met, and if the curing rate is further improved, the performances of bending, weather resistance and the like can be met, and the requirements are yet to be examined.
Disclosure of Invention
The invention aims to provide an indoor mixed high-speed cured polyester resin, and a powder coating prepared from the polyester resin has good high-speed curing performance, good adhesion to a base material and good impact resistance and bending performance.
The invention also aims to provide a preparation method of the indoor mixed high-speed cured polyester resin, which optimizes the addition sequence and reaction parameters of raw materials, and uses a composite esterification catalyst to ensure that the prepared polyester resin has higher activity and lower softening point, and the powder coating prepared by using the preparation method can be fully cured at a high speed within a certain time. The powder coating made of the polyester resin produced by the technology is widely applicable to intelligent coating production lines and spraying robots.
The invention also aims to provide an application of the indoor mixed high-speed cured polyester resin, wherein the prepared high-speed cured polyester resin and the epoxy resin adopt a specific mixing proportion, and the ethyl triphenyl phosphorus 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 high-speed cured polyester resin comprises the following raw materials in parts by weight:
100-200 parts of polyalcohol, 150-250 parts of acid, 1.5-2.5 parts of esterification catalyst and 3-5 parts of curing accelerator;
the polyalcohol is selected from 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.
Preferably, the polyol is neopentyl glycol, 1, 3-propanediol, 2-methyl-1, 3-propanediol, 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 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 passes delta-Al 2 O 3 And (3) loading. The preparation method comprises the steps of mixing delta-Al 2 O 3 Placing the catalyst in a solution containing titanium ions and tin ions for immersion treatment, roasting, and then heating the catalyst in a reducing atmosphere for reduction reaction to obtain the composite esterification catalyst. Compared with the prior esterification catalyst, the catalyst is delta-Al 2 O 3 The supported titanium-tin bimetallic catalyst, titanium salt and tin salt have higher catalytic efficiency, but both are homogeneous catalysts, the post-treatment after the catalytic esterification reaction is complex, delta-Al 2O3 is used as a carrier to support the titanium-tin bimetallic catalyst, the advantages of higher catalytic efficiency of the titanium-tin bimetallic catalyst and the titanium-tin bimetallic catalyst can be combined, the supported catalyst is a heterogeneous catalyst, and the catalyst can be recycled after the catalytic esterification reaction is completed, and the catalyst can be cleaned and ground to save the raw material cost; secondly, the surface particles of the esterification catalyst obtained by adopting delta-Al 2O3 as a carrier are of nano-scale, the surface area is larger, the stability is better, the activity is higher, and the catalysis is improvedActivity of the enzyme; and the esterification catalyst is nontoxic and harmless, and does not corrode a metal reaction kettle.
The curing accelerator is ammonium salt and phosphorus salt, preferably ethyl triphenyl phosphonium bromide or isopropyl triphenyl phosphonium bromide.
The invention provides a preparation method of indoor mixed high-speed cured polyester resin, which comprises the following steps:
(1) The first stage: adding the acid with the formula amount into a reaction kettle, adding alcohol with the formula amount being 50% and a composite esterification catalyst with the formula amount being 50% 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 ℃, carrying out first vacuum concentration, adding isophthalic acid for end sealing, and carrying out 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 be 5000-20000 daltons.
(4) Fourth stage: finally, controlling the kettle temperature at 150-200 ℃, adding curing accelerator in the formula amount, completing the reaction, and discharging to obtain the indoor mixed high-speed curing polyester resin.
Effective effects of
By introducing proper polyfunctional monomers and using a 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 solidification; meanwhile, the reactive crosslinking groups of the polyester resin are reduced, so that the functionality capable of reacting with the curing agent is improved, the reactivity of the polyester resin is improved, and the problem that the polyester resin is pre-cured during high-temperature melt extrusion is solved. The prepared high-speed cured polyester resin and epoxy resin adopt a specific mixing proportion, and an ethyl triphenyl phosphorus bromide curing accelerator is added to replace a 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
1mol of titanium tetrachloride and 0.5mol of tin tetrachloride are mixed with 500ml of water to prepare a mixed salt solution, and the mixed salt solution is put into spherical delta-Al 2 O 3 Soaking the carrier for 24h, evaporating the carrier, heating to 700 ℃ in a muffle furnace, and roasting for 8h to obtain modified Ti-Sn/delta-Al 2 O 3 The volume ratio of the catalyst precursor is 1: 5H 2 /N 2 Reducing for 6 hours at 300 ℃ under the mixed atmosphere to obtain the composite esterification catalyst Ti-Sn/delta-Al 2 O 3 Catalyst 1.
Example 2: preparation of composite esterification catalyst 2
1mol of titanium tetrachloride and 1mol of tin tetrachloride were mixed with 500ml of water to prepare a mixed salt solution, and the mixed salt solution was put into spherical delta-Al 2 O 3 Soaking the carrier for 24h, evaporating the carrier, heating to 700 ℃ in a muffle furnace, and roasting for 8h to obtain modified Ti-Sn/delta-Al 2 O 3 The volume ratio of the catalyst precursor is 1: 5H 2 /N 2 Reducing for 6 hours at 300 ℃ under the mixed atmosphere to obtain the composite esterification catalyst Ti-Sn/delta-Al 2 O 3 Catalyst 2.
Example 3: preparation of composite esterification catalyst 3
1mol of titanium tetrachloride and 0.75mol of tin tetrachloride are mixed with 500ml of water to prepare a mixed salt solution, and the mixed salt solution is put into spherical delta-Al 2 O 3 Soaking the carrier for 24h, evaporating the carrier, heating to 700 ℃ in a muffle furnace, and roasting for 8h to obtain modified Ti-Sn/delta-Al 2 O 3 The volume ratio of the catalyst precursor is 1: 5H 2 /N 2 Reducing for 6 hours at 300 ℃ under the mixed atmosphere to obtain the composite esterification catalyst Ti-Sn/delta-Al 2 O 3 And a catalyst 3.
Example 4: preparation of composite esterification catalyst 4
1mol of titanium tetrachloride and 0.8mol of tin tetrachloride are mixed with 500ml of water to prepare a mixed salt solution, and the mixed salt solution is put into spherical delta-Al 2 O 3 Impregnation of the supportTreating for 24h, evaporating the carrier, heating to 700 ℃ in a muffle furnace, and roasting for 8h to obtain modified Ti-Sn/delta-Al 2 O 3 The volume ratio of the catalyst precursor is 1: 5H 2 /N 2 Reducing for 6 hours at 300 ℃ under the mixed atmosphere to obtain the composite esterification catalyst Ti-Sn/delta-Al 2 O 3 Catalyst 4.
Example 5: preparation of composite esterification catalyst 5
1mol of titanium tetrachloride and 0.6mol of tin tetrachloride are mixed with 500ml of water to prepare a mixed salt solution, and the mixed salt solution is put into spherical delta-Al 2 O 3 Soaking the carrier for 24h, evaporating the carrier, heating to 700 ℃ in a muffle furnace, and roasting for 8h to obtain modified Ti-Sn/delta-Al 2 O 3 The volume ratio of the catalyst precursor is 1: 5H 2 /N 2 Reducing for 6 hours at 300 ℃ under the mixed atmosphere to obtain the composite esterification catalyst Ti-Sn/delta-Al 2 O 3 And a catalyst 5.
Example 6: preparation of indoor hybrid high-rate cured polyester resin 6
(1) The first stage: 150Kg of terephthalic acid and 100Kg of water are put into a reaction kettle, 50Kg of neopentyl glycol and 0.75Kg of the composite esterification catalyst 1 prepared in the example 1 are added under the stirring condition, the kettle is sealed, the reaction is heated, the temperature is 130-160 ℃, and the reaction is carried out for 2 hours;
(2) And a second stage: then adding 50Kg of neopentyl glycol and 0.75Kg of the composite esterification catalyst 1 prepared in the example 1, and reacting for 3 hours at the temperature of 200-300 ℃;
(3) And a third stage: then, carrying out the first vacuum polycondensation under 200-250 ℃ until the acid value is 10-20mgKOH/g, then adding 3.5kg of acidolysis agent isophthalic acid for end capping, and carrying out the second vacuum pumping for acidolysis reaction when the acid value is 70-80mgKOH/g to obtain polyester resin with the viscosity of 60-80mpa.s/175 ℃; the molecular weight of the polyester resin is controlled to 10000-20000 daltons.
(4) Fourth stage: finally, controlling the kettle temperature at 150-200 ℃, adding 3Kg of curing accelerator ethyl triphenyl phosphonium bromide to complete the reaction, and discharging to obtain the indoor mixed high-speed curing polyester resin.
Examples 7 to 10: preparation of indoor mixed high-speed cured polyester resin 7-10
According to the preparation method of example 6, the composite esterification catalyst was 2-5 using the composite esterification catalysts prepared in examples 2-5.
Example 11: preparation of indoor hybrid high-rate cured polyester resin 11
(1) The first stage: 200Kg of terephthalic acid and 150Kg of water are put into a reaction kettle, 75Kg of neopentyl glycol and 1.0Kg of the composite esterification catalyst 1 prepared in the example 1 are added under the stirring condition, the kettle is sealed, the reaction is heated, the temperature is 150-170 ℃, and the reaction lasts for 1.5 hours;
(2) And a second stage: then 75Kg of neopentyl glycol and 1.0Kg of the composite esterification catalyst 1 prepared in the example 1 are added for reaction for 3 hours at the temperature of 200-300 ℃;
(3) And a third stage: then, carrying out the first vacuum polycondensation under 200-250 ℃ until the acid value is 15-25mgKOH/g, then adding 5.0kg of isophthalic acid serving as an acidolysis agent for end capping, and carrying out the second vacuum pumping for acidolysis reaction when the acid value is 60-70mgKOH/g to obtain polyester resin with the viscosity of 55-70mpa.s/175 ℃; the molecular weight of the polyester resin is controlled to 10000-20000 daltons.
(4) Fourth stage: finally, controlling the kettle temperature at 150-200 ℃, adding 5Kg of curing accelerator ethyl triphenyl phosphonium bromide to complete the reaction, and discharging to obtain the indoor mixed high-speed curing polyester resin.
Examples 12 to 15: preparation of indoor mixed high-speed cured polyester resin 12-15
The composite esterification catalyst was used in the preparation method of example 11, using the composite esterification catalysts 2 to 5 prepared in examples 2 to 5.
Comparative example 1: preparation of cured polyester resin
(1) The first stage: 150Kg of terephthalic acid and 100Kg of water are put into a reaction kettle, 50Kg of neopentyl glycol and 0.75Kg of monobutyl dihydroxy tin chloride are added under the stirring condition, the kettle is sealed, heated and reacted for 2 hours at the temperature of 130-160 ℃;
(2) And a second stage: then 50Kg of neopentyl glycol and 0.75Kg of monobutyl dihydroxy tin chloride are added for reaction for 3 hours at the temperature of 200-300 ℃;
(3) And a third stage: then, carrying out the first vacuum polycondensation under 200-250 ℃ until the acid value is 10-20mgKOH/g, then adding 3.5kg of acidolysis agent isophthalic acid for end capping, and carrying out the second vacuum pumping for acidolysis reaction when the acid value is 70-80mgKOH/g, thus obtaining the polyester resin with the viscosity of 200-260mpa.s/175 ℃.
(4) Fourth stage: finally, controlling the kettle temperature at 150-200 ℃, adding 3Kg of curing accelerator ethyl triphenyl phosphonium bromide, completing the reaction, and discharging to obtain the curing polyester resin. Comparative example 2: preparation of cured polyester resin
(1) The first stage: 150Kg of terephthalic acid and 100Kg of water are put into a reaction kettle, 50Kg of neopentyl glycol and 0.75Kg of isopropyl titanate are added under the stirring condition, the kettle is sealed, heated and reacted for 2 hours at the temperature of 130-160 ℃;
(2) And a second stage: then 50Kg of neopentyl glycol and 0.75Kg of isopropyl titanate are added for reaction for 3 hours at the temperature of 200-300 ℃;
(3) And a third stage: then, carrying out the first vacuum polycondensation under 200-250 ℃ until the acid value is 10-20mgKOH/g, then adding 3.5kg of acidolysis agent isophthalic acid for end capping, and carrying out the second vacuum pumping for acidolysis reaction when the acid value is 70-80mgKOH/g, thus obtaining the polyester resin with the viscosity of 300-330mpa.s/175 ℃.
(4) Fourth stage: finally, controlling the kettle temperature at 150-200 ℃, adding 3Kg of curing accelerator ethyl triphenyl phosphonium bromide, completing the reaction, and discharging to obtain the curing polyester resin. Comparative example 3: preparation of cured polyester resin
150Kg of terephthalic acid and 100Kg of water are put into a reaction kettle, 100Kg of neopentyl glycol and 1.5Kg of the composite esterification catalyst 1 prepared in the embodiment are added under stirring, the kettle is sealed, the reaction is heated at 200-250 ℃ for 2 hours, the first vacuum polycondensation is carried out until the acid value is 10-20mgKOH/g, then 3.5Kg of isophthalic acid serving as an acidolysis agent is added for end sealing, when the acid value reaches 70-80mgKOH/g, the acidolysis reaction is carried out for the second vacuum pumping, and the polyester resin is obtained, wherein the viscosity is 180-220mpa.s/175 ℃. Finally, controlling the kettle temperature at 150-200 ℃, adding 3Kg of curing accelerator ethyl triphenyl phosphonium bromide, completing the reaction, and discharging to obtain the curing polyester resin.
Example 16: performance testing
The high-speed cured polyester resin prepared according to the methods of examples 6-15 and the cured polyester resin prepared in comparative examples 1-3 are respectively applied to powder coatings, wherein the application process comprises the steps of uniformly mixing the polyester resin, the epoxy resin, the curing agent, the titanium pigment and the silicon micropowder according to the proportion of 50:50:15:15:3, extruding the mixture through a double-screw extruder, tabletting, crushing the mixture after cooling, sieving the mixture and carrying out electrostatic spraying. The coatings were tested according to national standards for performance, gel time according to GB/T16995-1997, gloss according to GB/T9754-2007, impact according to GB/T1732-1993, and the test results are shown in Table 1.
Table 1: coating Performance test from polyester resin
From the test results, 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 a high speed when applied to powder coating, is suitable for intelligent coating production lines, and has very broad application prospect.
Claims (3)
1. An indoor mixed high-speed cured polyester resin is characterized by comprising the following raw materials in parts by weight:
100-200 parts of polyalcohol, 150-250 parts of acid, 1.5-2.5 parts of esterification catalyst and 3-5 parts of curing accelerator;
the polyol is selected from neopentyl glycol; the acid is selected from terephthalic acid and isophthalic acid;
the esterification catalyst is a composite esterification catalyst, whichIs a titanium tin bimetallic ion catalyst, and is prepared by delta-Al 2 O 3 A load; the preparation method of the composite esterification catalyst comprises the steps of mixing delta-Al 2 O 3 Placing the catalyst in a solution containing titanium ions and tin ions for immersion treatment, roasting, and then heating the catalyst in a reducing atmosphere for reduction reaction to obtain a composite esterification catalyst;
the curing accelerator is ethyl triphenyl phosphonium bromide or isopropyl triphenyl phosphonium bromide;
the preparation method of the indoor mixed high-speed cured polyester resin comprises the following steps:
(1) The first stage: adding the acid with the formula amount into a reaction kettle, adding alcohol with the formula amount being 50% and a composite esterification catalyst with the formula amount being 50% 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 sealing after performing 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 be 5000-20000 daltons;
(4) Fourth stage: and finally, controlling the kettle temperature to be 150-200 ℃, adding a formula amount of curing accelerator, completing the reaction, and discharging to obtain the indoor mixed high-speed curing polyester resin.
2. The use of the indoor mixed type high-speed cured polyester resin according to claim 1, wherein the prepared indoor mixed type high-speed cured polyester resin is mixed with epoxy resin, and ethyl triphenyl phosphorus bromide curing accelerator is added to prepare the coating.
3. Use of an indoor mixed high speed cure polyester resin according to claim 2, characterized in that the weight ratio of polyester resin to epoxy resin is 50:50.
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