CN110964180A - Polyester resin for delustering powder coating, powder coating and preparation method of powder coating - Google Patents
Polyester resin for delustering powder coating, powder coating and preparation method of powder coating 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
- C08G63/02—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
- C08G63/02—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
- C08G63/185—Acids containing aromatic rings containing two or more 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
- C08G63/66—Polyesters containing oxygen in the form of ether groups
- C08G63/668—Polyesters containing oxygen in the form of ether groups derived from polycarboxylic acids and polyhydroxy compounds
- C08G63/672—Dicarboxylic acids and dihydroxy 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
- C08G63/68—Polyesters containing atoms other than carbon, hydrogen and oxygen
- C08G63/685—Polyesters containing atoms other than carbon, hydrogen and oxygen containing nitrogen
- C08G63/6854—Polyesters containing atoms other than carbon, hydrogen and oxygen containing nitrogen derived from polycarboxylic acids and polyhydroxy compounds
- C08G63/6856—Dicarboxylic acids and dihydroxy compounds
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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
- C09D167/02—Polyesters derived from dicarboxylic acids and dihydroxy compounds
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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
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/03—Powdery paints
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Abstract
The invention discloses a polyester resin for a delustering powder coating, a powder coating and a preparation method thereof, belonging to the technical field related to the powder coating; the polyester resin for the extinction type powder coating is prepared from the following components in parts by weight: 35-50 parts of polyol, 60-75 parts of aromatic polybasic acid, 0-5 parts of aliphatic polybasic acid, 0-1 part of branching agent, 0.05-0.2 part of esterification catalyst, 5-15 parts of acidifying agent, 0.05-0.2 part of heat stabilizer, 0.1-0.5 part of antioxidant and 0.1-1 part of curing accelerator; the powder coating has good leveling property, good impact resistance and bending resistance, and excellent curing film forming property, and can meet the requirement of industrial mass production; the powder coating can obtain 5-7% of low gloss and excellent dulling performance under the condition of adding a dulling agent.
Description
Technical Field
The invention relates to the technical field related to powder coatings, in particular to polyester resin for a delustering powder coating, a powder coating and a preparation method thereof.
Background
Compared with other types of powder coatings, the polyester resin powder coating has unique properties, particularly better weather resistance and ultraviolet light resistance than epoxy resin. In addition, because the polyester resin has polar groups, the powder coating rate is higher than that of epoxy resin, yellowing is not easy to occur in the baking process, the glossiness is high, the leveling property is good, a paint film is plump, the color is light, and the like, so that the decorative effect is good. Generally, the multifunctional electric refrigerator is widely applied to the fields of refrigerators, washing machines, dust collectors, instrument shells, bicycles, furniture and the like. The coating of powder coatings can be divided into high gloss, semi-gloss, low gloss and matte depending on the gloss, with high gloss products occupying a large proportion. However, as the application of the high-light type products becomes wider and more popular, the light pollution is caused.
The traditional low-gloss saturated polyester resin generally uses a chemical flatting agent to obviously reduce the surface gloss of the coating, but the chemical flatting has the defects of high cost, easy pollution generation and the like; if a physical delustering agent which is more environment-friendly and more cost-effective is used for delustering, higher requirements are required to be put on the saturated polyester resin. The polyester resin on the market at present has difficulty in achieving the desired effect.
Disclosure of Invention
Aiming at the technical problem of unsatisfactory extinction effect in the prior art, the invention provides a polyester resin for an extinction powder coating, the powder coating and a preparation method thereof.
In order to achieve the purpose, the technical scheme of the invention is as follows:
a polyester resin for a delustering powder coating is prepared from the following components in parts by weight: 35-50 parts of polyol, 60-75 parts of aromatic polybasic acid, 0-5 parts of aliphatic polybasic acid, 0-1 part of branching agent, 0.05-0.2 part of esterification catalyst, 5-15 parts of acidifying agent, 0.05-0.2 part of heat stabilizer, 0.1-0.5 part of antioxidant and 0.1-1 part of curing accelerator.
Preferably, the polyalcohol is one or more of neopentyl glycol, 2-methyl-1, 3-propanediol, 2-amino-2-methyl-1, 3-propanediol, higher diol, ethylene glycol and diethylene glycol;
the aromatic polybasic acid is one or two of terephthalic acid and isophthalic acid;
the fatty polybasic acid is one or more of adipic acid, aspartic acid, 1, 4-cyclohexanedicarboxylic acid and diethyl 3-oxoglutarate.
Preferably, the branching agent is trimethylolpropane;
the esterification catalyst is one or more of tricyclohexyl tin hydroxide, dibutyl tin dilaurate, monobutyl tin oxide, dibutyl tin diacetate and tetrabutyl titanate.
Preferably, the acidifying agent is one or more of ethane tricarboxylic acid, trimellitic anhydride, phthalic acid, oxalic acid, adipic acid, 1, 4-cyclohexanedicarboxylic acid.
Preferably, the heat stabilizer is triphenyl phosphite.
Preferably, the antioxidant is one or more of hypophosphorous acid, triphenyl phosphate, 2' -methylenebis (6-cyclohexyl-4-methylphenol), β (octadecyl 3, 5-di-tert-butyl-4-hydroxyphenyl) propionate and 3, 5-di-tert-butyl-4-hydroxybenzyl diethyl phosphonate;
the curing accelerator is one or more of triphenylphosphine, anilino formyl imidazole and phenyl imidazoline.
A preparation method of the polyester resin for the delustering powder coating comprises the following steps:
s1) adding the polyol and the branching agent into a reactor according to the proportion, and heating to raise the temperature until the materials are molten;
s2) adding the aromatic polybasic acid, the aliphatic polybasic acid and the esterification catalyst into the reactor according to the proportion, introducing nitrogen, heating to 190-210 ℃, and beginning to distill off water generated in the esterification reaction; then slowly heating to 240-250 ℃, reacting until no obvious distillate is evaporated and the acid value of the reactant is 15-25 mgKOH/g;
s3) adding the acidifying agent into the reactor according to the proportion, and reacting for 3-5 h;
s4) adding the heat stabilizer into the reactor according to the proportion, vacuumizing to 0.03-0.1 MPa, and performing polycondensation reaction for 2-6 h until the acid value reaches 5-10 mgKOH/g;
s5) adding the antioxidant and the curing accelerator into the reactor according to the proportion, stirring and dispersing uniformly, reacting for 0.5-1 h, cooling and discharging to obtain the product.
A powder coating comprising the polyester resin for a matting powder coating according to any one of the preceding claims.
Further, the light extinction type powder coating comprises 200-250 parts by weight of polyester resin for the light extinction type powder coating, and also comprises the following components in parts by weight: 100-120 parts of curing agent, 4-6 parts of flatting agent, 90-100 parts of pigment and filler, 2-4 parts of auxiliary agent and 15-20 parts of flatting agent.
A preparation method of the powder coating comprises the steps of uniformly mixing the components, carrying out melt extrusion, crushing and sieving.
The invention has the following advantages:
1. the powder coating has good leveling property, good impact resistance and bending resistance, and excellent curing film forming property, and can meet the requirement of industrial mass production;
2. the powder coating can obtain 5-7% of low gloss and excellent dulling performance under the condition of adding the dulling agent.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic diagram of the preparation process of the powder coating of the present invention.
Detailed Description
The following further describes embodiments of the present invention with reference to the drawings. It should be noted that the description of the embodiments is provided to help understanding of the present invention, but the present invention is not limited thereto. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
As shown in FIG. 1, the preparation method of the polyester resin for matte powder coating is as shown in examples A1-6
Example A1
S1) adding 35 parts of neopentyl glycol into the reactor according to the weight ratio, heating and raising the temperature until the materials are molten;
s2) adding 60 parts of phthalic acid, adipic acid and 0.05 part of tricyclohexyl tin hydroxide into a reactor according to the weight ratio, introducing nitrogen, heating to 190 ℃, and distilling off water generated in the esterification reaction; then slowly heating to 240 ℃, reacting until no obvious distillate is evaporated and the acid value of the reactant is 15 mgKOH/g;
s3) adding 5 parts of ethane tricarboxylic acid into the reactor according to the weight ratio to react for 3 hours;
s4) adding 0.05 part of triphenyl phosphite into the reactor according to the proportion, vacuumizing to 0.03MPa, and carrying out polycondensation reaction for 2h until the acid value reaches 5 mgKOH/g;
s5) adding 0.1 part of hypophosphorous acid and 0.1 part of triphenylphosphine into the reactor according to the weight ratio, stirring and dispersing uniformly, reacting for 0.5h, cooling and discharging to obtain the catalyst.
Example A2
S1) adding 40 parts of 2-methyl-1, 3-propanediol and 0.2 part of trimethylolpropane into a reactor according to the weight ratio, and heating until the materials are molten;
s2) adding 63 parts of isophthalic acid, 2 parts of aspartic acid and 0.1 part of dibutyl tin dilaurate into a reactor according to the weight ratio, introducing nitrogen, heating to 195 ℃, and beginning to distill off water generated by the esterification reaction; then slowly heating to 243 ℃, reacting until no obvious distillate is evaporated and the acid value of the reactant is 18 mgKOH/g;
s3) adding 8 parts of trimellitic anhydride into the reactor according to the weight ratio, and reacting for 3.5 h;
s4) adding 0.1 part of triphenyl phosphite into the reactor according to the proportion, vacuumizing to 0.06MPa, and carrying out polycondensation reaction for 3h until the acid value reaches 8 mgKOH/g;
s5) adding 0.2 part of triphenyl phosphate and 0.2 part of benzoyl imidazole into the reactor according to the weight ratio, stirring and dispersing uniformly, reacting for 0.6h, cooling and discharging to obtain the product.
Example A3
S1) adding 40 parts of 2-amino-2-methyl-1, 3-propanediol and 0.4 part of branching agent into a reactor according to the weight ratio, and heating until the materials are molten;
s2) adding 3 parts of 1, 4-cyclohexanedicarboxylic acid and 0.15 part of monobutyltin oxide into an isophthalic acid mixture of 65 parts of aromatic polybasic acid phthalic acid in a reactor according to the weight ratio, introducing nitrogen, heating to 200 ℃, and beginning to distill off water generated by an esterification reaction; then slowly heating to 245 ℃, reacting until no obvious distillate is evaporated and the acid value of the reactant is 20 mgKOH/g;
s3) adding 10 parts of acidifier phthalic acid into the reactor according to the weight ratio, and reacting for 4 hours;
s4) adding 0.15 part of heat stabilizer into the reactor according to the proportion, vacuumizing to 0.09MPa, and carrying out polycondensation reaction for 4h until the acid value reaches 10 mgKOH/g;
s5) adding 0.3 part of antioxidant 2,2' -methylene bis (6-cyclohexyl-4-methylphenol) and 0.6 part of phenyl imidazoline into the reactor according to the weight ratio, stirring and dispersing uniformly, reacting for 0.8h, cooling and discharging to obtain the product.
Example A4
S1) adding 45 parts of high-root diol and 0.8 part of branching agent into a reactor according to the weight ratio, and heating until the materials are molten;
s2) adding 73 parts of isophthalic acid, 4 parts of diethyl 3-oxoglutarate and 0.18 part of dibutyltin oxide into a reactor according to the weight ratio, introducing nitrogen, heating to 205 ℃, and starting distilling off water generated by the esterification reaction; then slowly heating to 248 ℃, reacting until no obvious distillate is evaporated and the acid value of the reactant is 23 mgKOH/g;
s3) adding 13 parts of oxalic acid into the reactor according to the weight ratio to react for 4.5 h;
s4) adding 0.18 part of triphenyl phosphite into the reactor according to the proportion, vacuumizing to 0.09MPa, and carrying out polycondensation reaction for 5 hours until the acid value reaches 8 mgKOH/g;
s5) adding 0.4 part of β - (3, 5-di-tert-butyl-4-hydroxyphenyl) octadecyl propionate and 0.8 part of phenyl imidazoline into a reactor according to the weight ratio, stirring and dispersing uniformly, reacting for 0.8h, cooling and discharging to obtain the catalyst.
Example A5
S1) adding 45 parts of ethylene glycol and 0.9 part of branching agent into a reactor according to the weight ratio, and heating to melt the materials;
s2) adding 73 parts of aromatic polybasic acid phthalic acid, 4 parts of diethyl 3-oxoglutarate and 0.18 part of dibutyltin diacetate into a reactor according to the weight ratio, introducing nitrogen, heating to 208 ℃, and starting distilling off water generated by the esterification reaction; then slowly heating to 245 ℃, reacting until no obvious distillate is evaporated and the acid value of the reactant is 23 mgKOH/g;
s3) adding 13 parts of adipic acid into the reactor according to the weight ratio and reacting for 5 hours;
s4) adding 0.2 part of heat stabilizer into the reactor according to the proportion, and then carrying out polycondensation reaction for 6h, wherein the acid value reaches 9 mgKOH/g;
s5) adding 0.4 part of octadecyl propionate and 0.8 part of phenyl imidazoline into the reactor according to the weight ratio, stirring and dispersing uniformly, reacting for 0.8h, cooling and discharging to obtain the catalyst.
Example A6
S1) adding 50 parts of diethylene glycol and 1 part of branching agent into the reactor according to the weight ratio, and heating to melt the materials;
s2) adding 75 parts of a mixture of phthalic acid and isophthalic acid, 5 parts of diethyl 3-oxoglutarate and 0.2 part of tetrabutyl titanate into a reactor according to the weight ratio, introducing nitrogen, heating to 210 ℃, and starting distilling off water generated by an esterification reaction; then slowly heating to 250 ℃, reacting until no obvious distillate is evaporated and the acid value of the reactant is 25 mgKOH/g;
s3) adding 15 parts of 1, 4-cyclohexanedicarboxylic acid into the reactor according to the weight ratio to react for 5 hours;
s4) adding 0.2 part of heat stabilizer into the reactor according to the proportion, and then carrying out polycondensation reaction for 6h, wherein the acid value reaches 10 mgKOH/g;
s5) adding 0.5 part of 3, 5-di-tert-butyl-4-hydroxybenzyl diethyl phosphonate and 1 part of phenyl imidazoline into a reactor according to the weight ratio, stirring and dispersing uniformly, reacting for 1h, cooling and discharging to obtain the catalyst.
In the above examples, all the components having the same functions may be substituted for each other, for example, adipic acid, aspartic acid, 1, 4-cyclohexanedicarboxylic acid and diethyl 3-oxoglutarate in different examples are aliphatic polybasic acids, and the adipic acid used in example A1 may be substituted with one or more of aspartic acid, 1, 4-cyclohexanedicarboxylic acid and diethyl 3-oxoglutarate; the adipic acid of example A1 is also useful in other examples; the substitution of other components of the same kind is the same, and the description is omitted.
Examples B1 to 3: preparation of matt powder coatings
Example B1
Accurately weighing 200 parts by weight of polyester resin for the delustering powder coating, 100 parts by weight of curing agent, 4 parts by weight of flatting agent, 90 parts by weight of pigment and filler, 2 parts by weight of auxiliary agent and 15 parts by weight of delustering agent, uniformly mixing, melting, extruding, crushing and sieving to obtain the required powder coating.
Example B2
225 parts of polyester resin for the extinction type powder coating, 110 parts of curing agent, 5 parts of flatting agent, 95 parts of pigment and filler, 3 parts of auxiliary agent and 18 parts of extinction agent are accurately weighed according to parts by weight, and the required powder coating is prepared by uniformly mixing, melt extrusion, crushing and sieving.
Example B3
250 parts of polyester resin for the extinction type powder coating, 120 parts of curing agent, 6 parts of flatting agent, 100 parts of pigment and filler, 4 parts of auxiliary agent and 20 parts of extinction agent are accurately weighed according to the parts by weight, and the required powder coating is prepared by uniformly mixing, melt extrusion, crushing and sieving.
Example B4
Accurately weighing 210 parts of polyester resin for the extinction type powder coating, 115 parts of curing agent, 5 parts of flatting agent, 90 parts of pigment and filler, 4 parts of auxiliary agent and 18 parts of extinction agent in parts by weight, uniformly mixing, melting, extruding, crushing and sieving to obtain the required powder coating.
In the embodiment B1-4, one or more of titanium dioxide, kaolin, talc, lithopone, mica powder, calcium carbonate, bentonite, iron oxide, aluminum silicate, barium sulfate, copper gold powder, aluminum paste, and the like may be optionally selected according to the color requirements in actual use.
Through detection, after the extinction type powder coating prepared from the polyester resin for the extinction type powder coating is baked for 15min at 180 ℃, 60-degree gloss can reach 5-7%, the adhesion is strong, the impact resistance and the bending resistance are good, the comprehensive performance is good, and the cost performance is high; in addition, the invention is a physical extinction product and has the advantage of environmental protection.
The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the described embodiments. It will be apparent to those skilled in the art that various changes, modifications, substitutions and alterations can be made in the embodiments without departing from the principles and spirit of the invention, and these embodiments are within the scope of the invention.
Claims (10)
1. A polyester resin for a delustering powder coating is characterized in that: the adhesive is prepared from the following components in parts by weight: 35-50 parts of polyol, 60-75 parts of aromatic polybasic acid, 0-5 parts of aliphatic polybasic acid, 0-1 part of branching agent, 0.05-0.2 part of esterification catalyst, 5-15 parts of acidifying agent, 0.05-0.2 part of heat stabilizer, 0.1-0.5 part of antioxidant and 0.1-1 part of curing accelerator.
2. A polyester resin for flatting powder paint according to claim 1, characterized in that: the polyalcohol is one or more of neopentyl glycol, 2-methyl-1, 3-propylene glycol, 2-amino-2-methyl-1, 3-propylene glycol, higher diol, ethylene glycol and diethylene glycol;
the aromatic polybasic acid is one or two of terephthalic acid and isophthalic acid;
the fatty polybasic acid is one or more of adipic acid, aspartic acid, 1, 4-cyclohexanedicarboxylic acid and diethyl 3-oxoglutarate.
3. A polyester resin for flatting powder paint according to claim 1, characterized in that: the branching agent is trimethylolpropane;
the esterification catalyst is one or more of tricyclohexyl tin hydroxide, dibutyl tin dilaurate, monobutyl tin oxide, dibutyl tin diacetate and tetrabutyl titanate.
4. A polyester resin for flatting powder paint according to claim 1, characterized in that: the acidifier is one or more of ethane tricarboxylic acid, trimellitic anhydride, phthalic acid, oxalic acid, adipic acid and 1, 4-cyclohexanedicarboxylic acid.
5. A polyester resin for flatting powder paint according to claim 1, characterized in that: the heat stabilizer is triphenyl phosphite.
6. A polyester resin for a matted powder coating according to claim 1, wherein said antioxidant is one or more of hypophosphorous acid, triphenyl phosphate, 2' -methylenebis (6-cyclohexyl-4-methylphenol), β - (3, 5-di-tert-butyl-4-hydroxyphenyl) octadecyl propionate, 3, 5-di-tert-butyl-4-hydroxybenzyl diethyl phosphonate;
the curing accelerator is one or more of triphenylphosphine, anilino formyl imidazole and phenyl imidazoline.
7. A method for preparing a polyester resin for a flatting powder coating according to any one of claims 1 to 6, characterized in that: the method comprises the following steps:
s1) adding the polyol and the branching agent into a reactor according to the proportion, and heating to raise the temperature until the materials are molten;
s2) adding the aromatic polybasic acid, the aliphatic polybasic acid and the esterification catalyst into the reactor according to the proportion, introducing nitrogen, heating to 190-210 ℃, and beginning to distill off water generated in the esterification reaction; then slowly heating to 240-250 ℃, reacting until no obvious distillate is evaporated and the acid value of the reactant is 15-25 mgKOH/g;
s3) adding the acidifying agent into the reactor according to the proportion, and reacting for 3-5 h;
s4) adding the heat stabilizer into the reactor according to the proportion, vacuumizing to 0.03-0.1 MPa, and performing polycondensation reaction for 2-6 h until the acid value reaches 5-10 mgKOH/g;
s5) adding the antioxidant and the curing accelerator into the reactor according to the proportion, stirring and dispersing uniformly, reacting for 0.5-1 h, cooling and discharging to obtain the product.
8. A powder coating characterized by: a delustering powder coating composition comprising the polyester resin for a delustering powder coating according to any one of claims 1 to 6.
9. The powder coating of claim 8, wherein: the polyester resin for the extinction type powder coating comprises 200-250 parts by weight of the polyester resin for the extinction type powder coating, and also comprises the following components in parts by weight: 100-120 parts of curing agent, 4-6 parts of flatting agent, 90-100 parts of pigment and filler, 2-4 parts of auxiliary agent and 15-20 parts of flatting agent.
10. A process for the preparation of a powder coating according to claim 8 or 9, characterized in that: the composition is prepared by uniformly mixing the components, melting, extruding, crushing and sieving.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911130082.0A CN110964180A (en) | 2019-11-18 | 2019-11-18 | Polyester resin for delustering powder coating, powder coating and preparation method of powder coating |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911130082.0A CN110964180A (en) | 2019-11-18 | 2019-11-18 | Polyester resin for delustering powder coating, powder coating and preparation method of powder coating |
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| CN110964180A true CN110964180A (en) | 2020-04-07 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116199870A (en) * | 2023-02-14 | 2023-06-02 | 江苏达美瑞新材料有限公司 | Polyester resin containing isobutyl side group structure, powder coating and preparation method thereof |
-
2019
- 2019-11-18 CN CN201911130082.0A patent/CN110964180A/en not_active Withdrawn
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116199870A (en) * | 2023-02-14 | 2023-06-02 | 江苏达美瑞新材料有限公司 | Polyester resin containing isobutyl side group structure, powder coating and preparation method thereof |
| CN116199870B (en) * | 2023-02-14 | 2024-01-26 | 江苏达美瑞新材料有限公司 | Polyester resin containing isobutyl side group structure, powder coating and preparation method thereof |
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