CN116535622A - Self-drying/baking dual-purpose hydrolysis-resistant alkyd resin and preparation method thereof - Google Patents

Self-drying/baking dual-purpose hydrolysis-resistant alkyd resin and preparation method thereof Download PDF

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CN116535622A
CN116535622A CN202310511120.7A CN202310511120A CN116535622A CN 116535622 A CN116535622 A CN 116535622A CN 202310511120 A CN202310511120 A CN 202310511120A CN 116535622 A CN116535622 A CN 116535622A
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acid
alkyd resin
self
drying
hydrolysis
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崔国栋
王瑞晓
邵瑞峰
路建
邢勇
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Chambroad Chemical Industry Research Institute Co Ltd
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    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08GMACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G63/00Macromolecular compounds obtained by reactions forming a carboxylic ester link in the main chain of the macromolecule
    • C08G63/02Polyesters derived from hydroxycarboxylic acids or from polycarboxylic acids and polyhydroxy compounds
    • C08G63/12Polyesters derived from hydroxycarboxylic acids or from polycarboxylic acids and polyhydroxy compounds derived from polycarboxylic acids and polyhydroxy compounds
    • C08G63/46Polyesters chemically modified by esterification
    • C08G63/48Polyesters chemically modified by esterification by unsaturated higher fatty oils or their acids; by resin acids
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    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
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    • C08G63/00Macromolecular compounds obtained by reactions forming a carboxylic ester link in the main chain of the macromolecule
    • C08G63/02Polyesters derived from hydroxycarboxylic acids or from polycarboxylic acids and polyhydroxy compounds
    • C08G63/12Polyesters derived from hydroxycarboxylic acids or from polycarboxylic acids and polyhydroxy compounds derived from polycarboxylic acids and polyhydroxy compounds
    • C08G63/52Polycarboxylic acids or polyhydroxy compounds in which at least one of the two components contains aliphatic unsaturation
    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08GMACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G63/00Macromolecular compounds obtained by reactions forming a carboxylic ester link in the main chain of the macromolecule
    • C08G63/68Polyesters containing atoms other than carbon, hydrogen and oxygen
    • C08G63/682Polyesters containing atoms other than carbon, hydrogen and oxygen containing halogens
    • C08G63/6824Polyesters containing atoms other than carbon, hydrogen and oxygen containing halogens derived from polycarboxylic acids and polyhydroxy compounds
    • C08G63/6828Polycarboxylic acids and polyhydroxy compounds in which at least one of the two components contains aliphatic unsaturation
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    • C09DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
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    • C09D167/00Coating compositions based on polyesters obtained by reactions forming a carboxylic ester link in the main chain; Coating compositions based on derivatives of such polymers
    • C09D167/08Polyesters modified with higher fatty oils or their acids, or with natural resins or resin acids
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02PCLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P20/00Technologies relating to chemical industry
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Abstract

The invention belongs to the technical field of alkyd resin preparation, and in particular relates to an air-drying/baking dual-purpose hydrolysis-resistant multipurpose alkyd resin and a preparation method thereof, wherein the alkyd resin has a molecular weight of 3000-15000, an acid value of 15-60mgKOH/g, a hydroxyl value of 50-120mgKOH/g, a solid content of 65-80% and a neutralization degree of 50-100%. The resin is pure alkyd resin, so that the gloss under the high humidity condition is improved; the alkyd resin can be self-dried at room temperature and used for alkyd self-drying paint, and has the characteristics of high gloss, high solid-dry hardness and excellent water resistance; the coating can also participate in the crosslinking reaction of amino resin, is used for alkyd baking varnish, has excellent flexibility on the basis of keeping high hardness and high gloss, and can be applied to common water-based metal baking varnish and water-based coiled material baking varnish; the alkyd resin has excellent hydrolysis resistance and excellent storage stability.

Description

Self-drying/baking dual-purpose hydrolysis-resistant alkyd resin and preparation method thereof
Technical Field
The invention belongs to the technical field of alkyd resin preparation, and particularly relates to self-drying/baking dual-purpose hydrolysis-resistant alkyd resin and a preparation method thereof.
Background
The alkyd paint is gradually converted into a water-based product from a solvent type according to environmental protection and industry requirements, the alkyd resin is used as a main body of the paint product, the hydrolysis resistance, the gloss, the surface dry-real dryness, the hardness, the water resistance of a paint film and other comprehensive performances are greatly reduced, in practical application, the resin is expected to be used for self-drying paint and baking paint in the market, and the resin has higher requirements on the resin performance due to different use mechanisms and application standards of the two types of paint.
Most of the alkyd resins with excellent hydrolysis resistance sold in the market are acrylic resin modified alkyd, but certain ungrafted acrylic resin components exist in the reaction, so that the gloss and adhesive force of a paint film are affected, and the gloss of the existing alkyd resin is difficult to reach a gloss with an angle of 20 degrees being more than 90 degrees under the condition of high humidity; whereas pure alkyd (non-modified) resins face the difficult problem of easy hydrolysis on long-term storage.
Disclosure of Invention
Aiming at the technical problems existing at present, the invention provides an air-drying/baking dual-purpose hydrolysis-resistant alkyd resin and a preparation method thereof, wherein the resin is pure alkyd resin, and excellent wettability of the resin can ensure excellent gloss after film formation, and especially the gloss under high humidity condition is improved; the alkyd resin can be self-dried at room temperature and used for alkyd self-drying paint, and has the characteristics of high gloss, high solid-dry hardness and excellent water resistance; the coating can also participate in the crosslinking reaction of amino resin, is used for alkyd baking varnish, has excellent flexibility on the basis of keeping high hardness and high gloss, and can be applied to common water-based metal baking varnish and water-based coiled material baking varnish; the alkyd resin has excellent hydrolysis resistance and excellent storage stability.
According to the invention, a special monomer is introduced, and is branched to a resin main chain in a side chain group mode, so that an umbrella cap structure is formed, easily-hydrolyzed groups on the resin are protected, and the problem of unstable storage of the water-based alkyd resin is solved; by introducing double bonds and hydroxyl groups into the special monomer, the special monomer has the dual functions of self-drying and crosslinking curing, and side chain groups participate in oxidative crosslinking due to the structure of the double bonds, so that the crosslinking density under the self-drying condition is improved, the water resistance of a paint film is improved, and meanwhile, the gloss of the paint film under the high humidity condition is improved due to the reactivity of the side chains, so that the paint film has the self-drying performance of water soaking resistance, quick surface drying and quick upper hardness; meanwhile, the special monomer has a hydroxyl structure, the hydroxyl content of the resin is improved, and the special monomer is matched with amino resin to be applied to baking varnish, is resistant to MEK (methyl ethyl ketone) solvent wiping, has excellent various resistance indexes, and widens the application field of the water-based alkyd resin. The specific technical scheme is as follows:
an air-drying/baking dual-purpose hydrolysis-resistant alkyd resin has a molecular weight of 3000-15000, an acid value of 15-60mgKOH/g, a hydroxyl value of 50-120mgKOH/g, a solid content of 65-80% and a neutralization degree of 50-100%.
Preferably, the alkyd resin has a solids content of 65-75%.
Preferably, the alkyd resin comprises special monomers in preparation raw materials, and the preparation method of the special monomers is as follows: dimethylol propionic acid and allyl glycerol ether are mixed, heated to 120-150 ℃ and reacted for 2-5 hours to obtain a special monomer; the allyl glycidyl ether is one of glycidyl methacrylate, allyl-2, 3-glycidyl ether, o-diallyl bisphenol A diglycidyl ether, cardanol glycidyl ether, allyl fluorine-containing glycidyl ether and ethylene glycol diglycidyl ether dimethacrylate phosphate; the mass ratio of dihydroxypropionic acid to allyl glycerol ether is 1:0.8-1.5.
Further preferably, the alkyd resin comprises the following preparation raw materials in parts by weight: 10-30wt% of polyalcohol, 10-30wt% of polybasic acid, 10-20wt% of fatty acid, 1-15wt% of special monomer, 0.01-1wt% of catalyst, 1-5wt% of neutralizer, 1-5wt% of water-based monomer and the balance of hydrophilic solvent.
Further preferably, the polybasic acid is two or any one of isophthalic acid, phthalic acid, terephthalic acid, succinic acid, glutaric acid, phthalic anhydride, adipic acid, cyclohexanedicarboxylic acid, benzoic acid, dimer acid and maleic anhydride.
Further preferably, the polyalcohol is one or more of dihydric alcohol, trihydric alcohol and tetrahydric alcohol in any proportion. More preferably, one or more of propylene glycol, glycerol, methylpropanediol, cyclohexanol, trimethylolpropane, butanediol, neopentyl glycol, pentanediol, octanediol, heptanediol, cyclohexanedimethanol, pentaerythritol, and trihydroxyethane are used in any proportion.
Further preferably, the water-based monomer is one or more of phthalic anhydride, trimellitic anhydride, tetrahydrophthalic anhydride, hexahydrophthalic anhydride, dimethylolpropionic acid, sodium metaxylylene sulfonate and polyethylene glycol, which are mixed in any proportion.
Further preferably, the fatty acid is one or more of soybean oil fatty acid, linoleic acid, eleostearic acid, ricinoleic acid, dehydrated ricinoleic acid and tall oil acid.
Further preferably, the catalyst is one of antimony, organotin catalyst and hypophosphorous acid, and the hydrophilic solvent is one or more selected from ethylene glycol monobutyl ether, propylene glycol methyl ether, propylene glycol butyl ether, dipropylene glycol methyl ether, diethylene glycol butyl ether, ethylene glycol methyl ether acetate, ethanol, n-butanol, isopropanol and butanol.
Further preferably, the neutralizing agent is selected from one of ammonia water, N-dimethylethanolamine, diethanolamine, triethanolamine, triethylamine, 1-methyldiethanolamine, and sodium hydroxide.
The preparation method of the self-drying/baking dual-purpose hydrolysis-resistant alkyd resin comprises the following steps:
(1) Mixing dihydroxypropionic acid with allyl glycerol ether, heating and reacting to obtain a special monomer;
(2) Putting polyalcohol, polybasic acid, special monomer and fatty acid into a reactor, slowly heating to 100-120 ℃, putting a catalyst into the reactor, slowly heating to 130-150 ℃, and preserving heat for 1-1.5h;
(3) Continuously heating to 5-10 ℃ per hour until the temperature reaches 210-240 ℃, carrying out heat preservation reaction, observing the water yield of the reaction, starting to measure the acid value when the water yield is 88-93%, and cooling to 150-160 ℃ after the acid value is less than 5-20 mgKOH/g;
(4) Then adding an aqueous monomer, reacting for 0.5-1h, and then cooling to 60-80 ℃;
(5) Adding hydrophilic solvent and neutralizing agent, and stirring completely and uniformly to obtain alkyd resin.
The preparation method is simple, short in time and safe in process, and the alkyd tree synthesized by the method has no abnormality after special monomers are introduced into the alkyd tree and stored in a 50 ℃ incubator for 12 months.
The alkyd resin disclosed by the invention can be self-dried at room temperature and used for alkyd self-drying paint, and has the characteristics of high gloss, high solid-dry hardness and excellent water resistance; the polyurethane can also participate in the crosslinking reaction of amino resin, is used for alkyd baking varnish, has excellent flexibility on the basis of keeping high hardness and high gloss, and can be applied to common water-based metal baking varnish and water-based coiled material baking varnish.
The special monomer is introduced into the invention and grafted on the side chain of the resin, so that the resin has excellent hydrolysis resistance and excellent storage stability, and solves the problems of poor hydrolysis resistance and difficult application commonly existing in water-based pure alkyd resin (non-acrylic acid modified alkyd resin). The special monomer has a double bond structure, so that side chain groups participate in oxidative crosslinking, the crosslinking density under the self-drying condition is improved, the water resistance of a paint film is improved, and meanwhile, the gloss of the paint film under the high humidity condition is improved due to the reactivity of the side chain; meanwhile, the special monomer has a hydroxyl structure, the hydroxyl content of the resin is improved, and the special monomer is matched with amino resin to be applied to baking varnish, so that various resistance indexes are excellent, and the application field of the water-based alkyd resin is widened. The self-drying/baking dual-purpose hydrolysis-resistant alkyd resin provided by the invention is used as a water-based alkyd resin, so that the solvent usage amount in the paint is effectively reduced, the VOC emission is reduced, and the alkyd resin is safe and environment-friendly.
The self-drying/baking dual-purpose hydrolysis-resistant alkyd resin and the preparation method thereof provided by the invention are pure alkyd resins, so that the gloss under the high humidity condition is improved, the hydrolysis resistance is excellent, and the storage stability is excellent. The alkyd resin can be self-dried at room temperature and used for alkyd self-drying paint, and has the characteristics of high gloss, high solid-dry hardness and excellent water resistance; the alkyd resin can also participate in the crosslinking reaction of amino resin, is used for alkyd baking varnish, has excellent flexibility on the basis of keeping high hardness and high gloss, can be applied to general water-based metal baking varnish and water-based coiled material baking varnish, has excellent various resistance indexes, widens the application field of the water-based alkyd resin, effectively reduces the use amount of solvents in the paint, reduces VOC (volatile organic compound) emission, and is safe and environment-friendly.
Detailed Description
The above-described aspects of the present invention will be described in further detail by way of the following embodiments, but it should not be construed that the scope of the above-described subject matter of the present invention is limited to the following examples. All techniques realized based on the above description of the present invention are within the scope of the present invention, and the following examples are accomplished by conventional techniques unless otherwise specified.
Example 1
Self-drying/baking dual-purpose hydrolysis-resistant multipurpose alkyd resin:
synthesis of special monomers: mixing dimethylol propionic acid with allyl-2, 3-epoxypropyl ether and other substances, heating to 130 ℃, reacting for 5 hours to obtain a special monomer, and filtering for later use;
86g of neopentyl glycol, 250g of soybean oil fatty acid, 43g of special monomer, 120g of trimethylolpropane, 10g of adipic acid, 190g of isophthalic acid and 6g of maleic anhydride are added into a four-neck flask provided with a thermometer, a stirring device and a condensation water-dividing device, and the mixture is heated and slowly heated to completely melt solid materials, and stirring is started; adding 0.3g of tin oxide serving as a catalyst under the material melting condition of 120 ℃, adjusting the material temperature to 150 ℃ within 2 hours, preserving heat for reaction for 1 hour, controlling the heating rate to 10 ℃/hour, gradually heating to 220 ℃, preserving heat for reaction at the temperature, continuously observing the water yield in the reaction process, starting to measure the acid value when the water yield reaches 90% of the theoretical water yield, cooling the material to 160 ℃, adding 30g of trimellitic anhydride, reacting for 0.5 hour, measuring the acid value to be less than 50mgKOH/g, and cooling to 60 ℃;
cooling to 60 ℃, adding 25g of neutralizing agent, namely N, N-dimethylethanolamine, stirring and reacting for 0.5 hour, adding 200g of hydrophilic solvent, namely ethylene glycol monobutyl ether, and adjusting the solid content of the product to 75wt%, thus obtaining the self-drying/baking dual-purpose hydrolysis-resistant alkyd resin with 8000 molecular weight, 75% of neutralization degree and 18mgKOH/g acid value.
After special monomers are introduced into the alkyd tree synthesized by the invention, the alkyd resin is stored for 12 months in a 50 ℃ incubator without abnormality, and the alkyd resin without the special monomers is stored for 15 days in the 50 ℃ incubator with turbidity and layering.
Example 2
Self-drying/baking dual-purpose hydrolysis-resistant multipurpose alkyd resin:
synthesis of special monomers: dimethylolpropionic acid and glycidyl methacrylate and other substances are mixed, the temperature is raised to 130 ℃, the special monomer is obtained after reaction for 5 hours, and the mixture is filtered for standby;
80g of pentaerythritol, 260g of soybean oil fatty acid, 43g of special monomer, 110g of trimethylolpropane, 200g of phthalic anhydride and 4g of maleic anhydride are added into a four-neck flask provided with a thermometer, a stirring device and a condensation water diversion device, and the mixture is heated and slowly heated to completely melt solid materials, and stirring is started; adding 0.3g of hypophosphorous acid serving as a catalyst under the material melting condition of 120 ℃, adjusting the material temperature to 150 ℃ within 2 hours, preserving heat for reaction for 1 hour, controlling the heating rate to 10 ℃/hour, gradually heating to 220 ℃, preserving heat for reaction at the temperature, continuously observing the water yield in the reaction process, when the water yield reaches 90% of the theoretical water yield, starting to measure the acid value, when the theoretical acid value is less than 5mgKOH/g, cooling the material to 160 ℃, adding 35g of trimellitic anhydride, reacting for 0.5 hour, measuring the acid value to be less than 50mgKOH/g, and cooling to 60 ℃;
cooling to 60 ℃, adding 20g of neutralizing agent, namely N, N-dimethylethanolamine, stirring and reacting for 0.5 hour, adding 200g of hydrophilic solvent, namely ethylene glycol monobutyl ether, and adjusting the solid content of the product to 75wt%, thus obtaining the self-drying/baking dual-purpose hydrolysis-resistant alkyd resin with the molecular weight of 7000, the neutralization degree of 70% and the acid value of 15mgKOH/g.
Example 3
Self-drying/baking dual-purpose hydrolysis-resistant multipurpose alkyd resin:
synthesis of special monomers: mixing dimethylolpropionic acid with the amount of substances such as o-diallyl bisphenol A diglycidyl ether, heating to 130 ℃, reacting for 5 hours to obtain a special monomer, and filtering for later use;
80g of trimethylolpropane, 260g of soybean oil fatty acid, 40g of special monomer, 110g of glycerol, 200g of phthalic anhydride and 4.5g of maleic anhydride are added into a four-neck flask provided with a thermometer, a stirring device and a condensation water-dividing device, and the mixture is heated and slowly heated to completely melt solid materials, and stirring is started; adding 0.3g of hypophosphorous acid serving as a catalyst under the material melting condition of 120 ℃, adjusting the material temperature to 150 ℃ within 2 hours, preserving heat for reaction for 1 hour, controlling the heating rate to 10 ℃/hour, gradually heating to 220 ℃, preserving heat for reaction at the temperature, continuously observing the water yield in the reaction process, when the water yield reaches 90% of the theoretical water yield, starting to measure the acid value, when the theoretical acid value is less than 5mgKOH/g, cooling the material to 160 ℃, adding 35g of trimellitic anhydride, reacting for 0.5 hour, measuring the acid value to be less than 50mgKOH/g, and cooling to 60 ℃;
cooling to 60 ℃, adding 30g of N, N dimethylethanolamine as a neutralizing agent, stirring for reacting for 0.5 hour, adding 200g of ethylene glycol monobutyl ether as a hydrophilic solvent, and adjusting the solid content to 75wt% to obtain the self-drying/baking dual-purpose hydrolysis-resistant alkyd resin, wherein the molecular weight of the resin is 7500, the neutralization degree is 80%, and the acid value is 20mgKOH/g.
Example 4
Self-drying/baking dual-purpose hydrolysis-resistant multipurpose alkyd resin:
synthesis of special monomers: mixing dimethylolpropionic acid with cardanol glycidyl ether and other substances, heating to 130 ℃, reacting for 5 hours to obtain a special monomer, and filtering for later use;
80g of trimethylolpropane, 260g of linoleic acid, 40g of special monomer, 110g of glycerol, 200g of phthalic acid and 4.5g of maleic anhydride are added into a four-neck flask provided with a thermometer, a stirring device and a condensation water diversion device, and the mixture is heated and slowly heated to completely melt the solid materials, and stirring is started; adding 0.3g of hypophosphorous acid serving as a catalyst under the material melting condition of 120 ℃, adjusting the material temperature to 150 ℃ within 2 hours, preserving heat for reaction for 1 hour, controlling the heating rate to 10 ℃/hour, gradually heating to 220 ℃, preserving heat for reaction at the temperature, continuously observing the water yield in the reaction process, when the water yield reaches 90% of the theoretical water yield, starting to measure the acid value, when the theoretical acid value is less than 5mgKOH/g, cooling the material to 160 ℃, adding 35g of trimellitic anhydride, reacting for 0.5 hour, measuring the acid value to be less than 50mgKOH/g, and cooling to 60 ℃;
cooling to 60 ℃, adding 18g of neutralizing agent, namely N, N-dimethylethanolamine, stirring and reacting for 0.5 hour, adding 200g of hydrophilic solvent, namely propylene glycol methyl ether, and adjusting the solid content of the product to 75wt%, thus obtaining the self-drying/bakeable dual-purpose hydrolysis-resistant alkyd resin, wherein the molecular weight of the resin is 9000, the neutralization degree is 65%, and the acid value is 15mgKOH/g.
Example 5
Self-drying/baking dual-purpose hydrolysis-resistant multipurpose alkyd resin:
synthesis of special monomers: dimethylol propionic acid and allyl fluorine-containing glycidyl ether and other substances are mixed, the temperature is raised to 130 ℃, the special monomer is obtained after reaction for 5 hours, and the mixture is filtered for standby;
80g of trimethylolpropane, 260g of dehydrated ricinoleic acid, 40g of special monomer, 110g of pentaerythritol, 215g of phthalic anhydride and 4.5g of maleic anhydride are added into a four-neck flask provided with a thermometer, a stirring device and a condensation water-dividing device, and the mixture is heated and slowly heated to completely melt solid materials, and stirring is started; adding 0.3g of hypophosphorous acid serving as a catalyst under the material melting condition of 120 ℃, adjusting the material temperature to 150 ℃ within 2 hours, preserving heat for reaction for 1 hour, controlling the heating rate to 10 ℃/hour, gradually heating to 220 ℃, preserving heat for reaction at the temperature, continuously observing the water yield in the reaction process, when the water yield reaches 90% of the theoretical water yield, starting to measure the acid value, when the theoretical acid value is less than 5mgKOH/g, cooling the material to 160 ℃, adding 35g of trimellitic anhydride, reacting for 0.5 hour, measuring the acid value to be less than 50mgKOH/g, and cooling to 60 ℃;
cooling to 60 ℃, adding 30g of neutralizing agent N, N dimethylethanolamine, stirring for reacting for 0.5 hour, adding 200g of hydrophilic solvent propylene glycol methyl ether, and adjusting the solid content to 75wt% to obtain the self-drying/bakeable dual-purpose hydrolysis-resistant alkyd resin, wherein the molecular weight of the resin is 10000, the neutralization degree is 85%, and the acid value is 20mgKOH/g.
The alkyd resin disclosed by the invention is not modified by acrylic resin, and the comprehensive performance of the alkyd resin exceeds that of acrylic modified alkyd resins sold in the market.
As self-drying resin, the following excellent properties were obtained
As a baking varnish type resin (amino resin) having the following excellent properties
Gloss of the product Excellent wettability, high glossiness of 20 DEG angle > 90, 60 DEG angle > 95
MEK wiping More than or equal to 150 times
Hardness of The hardness of the pencil is more than or equal to 2H
Storage stability Stored at 50℃for 14 days
T-bend ≤3T
Adhesion force Level 0
Storage stability 50 ℃ storageStored for 14 days
Test examples
The product in example 1 was selected, and a normal temperature air-dried top coat was formulated according to the following formulation, and the performance evaluation results were as follows:
table 1 air-drying top-coat formulation
Raw material name Proportioning, wt%
Alkyd resins 35
Ethylene glycol monobutyl ether 5
NN dimethylethanolamine 0.8
Defoaming agent 810 0.2
Leveling agent 450 0.1
Substrate wetting agent 4100 0.1
Titanium white powder 15
Red powder 8
Deionized water 35.8
Totals to 100
Table 2 results of testing the Performance of the Normal temperature air-dried topcoat
The product of example 1 was selected and the baking varnish was formulated according to the following formulation, with the following performance evaluation results:
table 3 baking varnish formulation
Raw material name Proportioning, wt%
Alkyd resins 35
Ethylene glycol monobutyl ether 5
NN dimethylethanolamine 0.8
Defoaming agent A10 0.2
Leveling agent 450 0.1
Substrate wetting agent 4100 0.1
Titanium white powder 15
325 amino resin 7
Deionized water 36.8
Totals to 100
TABLE 4 stoving varnish performance test results
Through color paint performance evaluation, the performance of the water-based resin reaches the application standard of the oleoresin, and the performance is excellent.
The self-drying/baking dual-purpose hydrolysis-resistant alkyd resin and the preparation method thereof provided by the invention are pure alkyd resins, so that the gloss under the high humidity condition is improved, the hydrolysis resistance is excellent, and the storage stability is excellent. The alkyd resin can be self-dried at room temperature and used for alkyd self-drying paint, and has the characteristics of high gloss, high solid-dry hardness and excellent water resistance; the alkyd resin can also participate in the crosslinking reaction of amino resin, is used for alkyd baking varnish, has excellent flexibility on the basis of keeping high hardness and high gloss, can be applied to general water-based metal baking varnish and water-based coiled material baking varnish, has excellent various resistance indexes, widens the application field of the water-based alkyd resin, effectively reduces the use amount of solvents in the paint, reduces VOC (volatile organic compound) emission, and is safe and environment-friendly.

Claims (10)

1. The self-drying/baking dual-purpose hydrolysis-resistant alkyd resin is characterized in that the molecular weight of the alkyd resin is 3000-15000, the acid value is 15-60mgKOH/g, the hydroxyl value is 50-120mgKOH/g, the solid content is 65-80%, and the neutralization degree is 50-100%.
2. The self-drying/baking dual-purpose hydrolysis-resistant alkyd resin as claimed in claim 1, wherein the alkyd resin comprises special monomers as raw materials, and the preparation method of the special monomers is as follows: dimethylol propionic acid and allyl glycerol ether are mixed, heated to 120-150 ℃ and reacted for 2-5 hours to obtain a special monomer; the allyl glycidyl ether is one of glycidyl methacrylate, allyl-2, 3-glycidyl ether, o-diallyl bisphenol A diglycidyl ether, cardanol glycidyl ether, allyl fluorine-containing glycidyl ether and ethylene glycol diglycidyl ether dimethacrylate phosphate;
the mass ratio of the dihydroxypropionic acid to the allyl glycerol ether is 1:0.8-1.5.
3. The self-drying/baking dual-purpose hydrolysis-resistant alkyd resin as claimed in claim 2, wherein the alkyd resin comprises the following raw materials in parts by weight: 10-30wt% of polyalcohol, 10-30wt% of polybasic acid, 10-20wt% of fatty acid, 1-15wt% of special monomer, 0.01-1wt% of catalyst, 1-5wt% of neutralizer, 1-5wt% of water-based monomer and the balance of hydrophilic solvent.
4. A self-drying/bakeable dual-purpose hydrolysis-resistant alkyd resin according to claim 3, wherein the polyacids are two or more of isophthalic acid, phthalic acid, terephthalic acid, succinic acid, glutaric acid, phthalic anhydride, adipic acid, cyclohexanedicarboxylic acid, dimer acid and maleic anhydride.
5. The self-drying/baking dual-purpose hydrolysis-resistant alkyd resin as recited in claim 3, wherein the polyol is one or more of dihydric alcohol, trihydric alcohol and tetrahydric alcohol in any proportion.
6. The self-drying/baking dual-purpose hydrolysis-resistant alkyd resin as claimed in claim 3, wherein the water-based monomer is one or more of phthalic anhydride, trimellitic anhydride, tetrahydrophthalic anhydride, hexahydrophthalic anhydride, dimethylolpropionic acid, sodium metaxylylene sulfonate and polyethylene glycol.
7. A self-drying/bakeable dual-purpose hydrolysis-resistant alkyd resin as recited in claim 3, wherein the fatty acid is one or more of soybean oil fatty acid, linoleic acid, eleostearic acid, ricinoleic acid, dehydrated ricinoleic acid, tall oil acid, or any ratio thereof.
8. A self-drying/bakeable dual-purpose hydrolysis-resistant alkyd resin according to claim 3, wherein the catalyst is one of antimony-based, organotin-based, hypophosphorous acid; the hydrophilic solvent is selected from one or more of ethylene glycol monobutyl ether, propylene glycol methyl ether, propylene glycol butyl ether, dipropylene glycol methyl ether, diethylene glycol butyl ether, ethylene glycol methyl ether acetate, ethanol, n-butanol, isopropanol and butanol.
9. A self-drying/bakeable dual-purpose hydrolysis-resistant alkyd resin according to claim 3, wherein the neutralizing agent is selected from one of ammonia, N dimethylethanolamine, diethanolamine, triethanolamine, triethylamine, 1-methyldiethanolamine, sodium hydroxide.
10. A method for preparing the self-drying/baking dual-purpose hydrolysis-resistant alkyd resin as claimed in any one of claims 1 to 9, which comprises the following steps:
(1) Mixing dimethylol propionic acid and allyl glycerol ether, heating and reacting to obtain a special monomer;
(2) Putting polyalcohol, polybasic acid, special monomer and fatty acid into a reactor, slowly heating to 100-120 ℃, putting a catalyst into the reactor, slowly heating to 130-150 ℃, and preserving heat for 1-1.5h;
(3) Continuously heating to 5-10 ℃ per hour until the temperature reaches 210-240 ℃, carrying out heat preservation reaction, observing the water yield of the reaction, starting to measure the acid value when the water yield is 88-93%, and cooling to 150-160 ℃ after the acid value is less than 5-20 mgKOH/g;
(4) Then adding an aqueous monomer, reacting for 0.5-1h, and then cooling to 60-80 ℃;
(5) Adding hydrophilic solvent and neutralizing agent, and stirring completely and uniformly to obtain alkyd resin.
CN202310511120.7A 2023-05-05 2023-05-05 Self-drying/baking dual-purpose hydrolysis-resistant alkyd resin and preparation method thereof Pending CN116535622A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117186369A (en) * 2023-10-13 2023-12-08 山西天宁新材料有限公司 Hyperbranched nonionic water-based alkyd resin and preparation method thereof

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117186369A (en) * 2023-10-13 2023-12-08 山西天宁新材料有限公司 Hyperbranched nonionic water-based alkyd resin and preparation method thereof

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