CN114989725B - Corrosion-resistant water-based silicon modified polyester can-making paint and preparation method thereof - Google Patents
Corrosion-resistant water-based silicon modified polyester can-making paint and preparation method thereof Download PDFInfo
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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
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- C09D183/00—Coating compositions based on macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon, with or without sulfur, nitrogen, oxygen, or carbon only; Coating compositions based on derivatives of such polymers
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Abstract
The invention discloses a corrosion-resistant water-based silicon modified polyester can-making paint and a preparation method thereof, belonging to the technical field of industrial paint, and comprising the following components in percentage by mass: 35 to 60 parts of water-based silicon modified polyester resin, 5 to 15 parts of water-based hydroxypropyl resin, 10 to 25 parts of amino resin, 5 to 20 parts of pigment, 5 to 20 parts of filler, 0.2 to 2 parts of catalyst, 2 to 4 parts of dispersing agent, 0.5 to 1.5 parts of adhesion promoter, 0.3 to 1 part of leveling agent, 0.3 to 0.8 part of defoaming agent, 0.2 to 1.5 parts of thickening auxiliary agent, 1 to 10 parts of cosolvent, 10 to 40 parts of deionized water and 1 to 6 parts of pH regulator. The corrosion-resistant water-based silicon modified polyester can-making paint and the preparation method thereof provided by the invention have good weather resistance, salt fog resistance, corrosion resistance, rust resistance, folding resistance and other performances, and also have good environmental protection, so that the paint is a water-based protective paint very suitable for metal packaging can-making.
Description
Technical Field
The invention belongs to the technical field of industrial coatings, and particularly relates to a corrosion-resistant water-based silicon modified polyester can-making coating and a preparation method thereof
Background
The metal packaging container is a thin-wall packaging container manufactured by metal thin plates, and is widely applied to food packaging, medicine packaging, daily necessities packaging, instrument packaging, industrial product packaging, ordnance packaging and the like. Wherein the number for food packaging is maximized. Because of the material characteristics, the metal package has better pressure resistance than the common package, is convenient to transport and is not easy to damage. It has the following advantages: 1. the metal packaging container has excellent barrier properties, and can not only block gases such as air, oxygen, water vapor, carbon dioxide and the like, but also block light, particularly ultraviolet light, so that deliquescence, deterioration, putrefaction and fading and flavor change of the inner package are not caused. 2. The metal packaging container has high rigidity, easy operation, collision, vibration and stacking, and is convenient for transportation and storage, so that the selling radius of the commodity is greatly increased. 3. The heat conductivity is good, the heating and cooling efficiency of the food metal can is high, the high-temperature sterilization and rapid cooling effects can be improved, and the cooking in the can of the content can be possibly realized. 4. The metal has good processing adaptability, and can realize high-precision and high-speed production for complex forming processing due to good metal ductility. 5. The use is convenient, the metal packaging container is not easy to be broken, and the carrying is convenient. 6. The decoration is beautiful, the metal container generally has beautiful metallic luster, and the beautiful commodity appearance is further increased by matching with the graphic printing with bright colors. Because of this, people often prefer goods packaged in metal containers when giving gifts. 7. The metal container completely meets the requirements of the food container on sanitation and safety due to the use of proper paint. 8. The waste is easy to treat, and the metal container can be recycled after being used up. Not only recycling resources and saving energy, but also eliminating environmental pollution. Even if the metal is scattered in soil after being rusted, the metal does not cause adverse effect on the environment.
Although having certain advantages, metal packaging cans have problems such as poor chemical stability and easy rusting under the action of acid, alkali, salt and humid air. This limits its range of use to some extent. In general, a metal packaging can is coated with a coating to protect the metal packaging can, and the common metal coating on the market is mainly an oily product, and the performances such as corrosion resistance, folding resistance and the like are not ideal.
Disclosure of Invention
The invention aims at overcoming the defects of the prior art, and provides a corrosion-resistant water-based silicon modified polyester can-making paint and a preparation method thereof, so as to solve various problems in the prior art.
In order to achieve the purpose of the invention, the following technical scheme is adopted: a corrosion-resistant water-based silicon modified polyester can-making paint and a preparation method thereof are characterized in that: the composition of the material in percentage by weight is as follows: 35 to 60 parts of water-based silicon modified polyester resin, 5 to 15 parts of water-based hydroxypropyl resin, 10 to 25 parts of amino resin, 5 to 20 parts of pigment, 5 to 20 parts of filler, 0.2 to 2 parts of catalyst, 2 to 4 parts of dispersing agent, 0.5 to 1.5 parts of adhesion promoter, 0.3 to 1 part of leveling agent, 0.3 to 0.8 part of defoaming agent, 0.2 to 1.5 parts of thickening auxiliary agent, 1 to 10 parts of cosolvent, 10 to 40 parts of deionized water and 1 to 6 parts of pH regulator.
As a preferable technical scheme of the invention, the corrosion-resistant water-based silicon modified polyester can-making paint and the preparation method thereof comprise the following components: 35 to 45 parts of water-based silicon modified polyester resin, 5 to 15 parts of water-based hydroxypropyl resin, 10 to 20 parts of amino resin, 5 to 10 parts of pigment, 5 to 10 parts of filler, 0.2 to 1.5 parts of catalyst, 2 to 3 parts of dispersing agent, 0.5 to 1 part of adhesion promoter, 0.3 to 1 part of leveling agent, 0.3 to 0.6 part of defoaming agent, 0.2 to 1 part of thickening auxiliary agent, 1 to 8 parts of cosolvent, 10 to 20 parts of deionized water and 1 to 4 parts of pH regulator.
As a further preferable technical scheme of the invention, the corrosion-resistant water-based silicon modified polyester can-making paint and the preparation method thereof comprise the following components: 40 parts of aqueous silicon modified polyester resin, 10 parts of aqueous hydroxypropyl resin, 15 parts of amino resin, 10 parts of pigment, 8 parts of filler, 0.5 part of catalyst, 2 parts of dispersing agent, 0.5 part of adhesion promoter, 0.3 part of leveling agent, 0.3 part of defoaming agent, 0.5 part of thickening auxiliary agent, 4 parts of cosolvent, 20 parts of deionized water and 3 parts of pH regulator.
The invention provides a corrosion-resistant water-based silicon modified polyester can-making paint and a preparation method thereof, and the corrosion-resistant water-based silicon modified polyester can-making paint comprises the following steps:
(1) Synthesis of aqueous silicon modified polyester resin: adding polybasic acid, polyhydric alcohol and catalyst into a reaction kettle according to a certain proportion, and filling N 2 Heating to 170deg.C, maintaining the temperature for 0.6 hr, continuously heating to 225 deg.C, maintaining the temperature for esterification for about 3 hr, sampling, and determining acid value of the reactant to obtain about 10mgKOH/g, and stopping introducing N when the reaction is completed 2 . Obtaining hydroxyl-terminated polyester resin with a certain branching degree;
(2) Cooling the synthesized hydroxyl-terminated polyester resin to 155 ℃, adding an organic silicon resin and a titanium compound catalyst under the stirring state, starting a vacuum pump to control the vacuum degree of a reaction system to be 0.01MPa, slowly heating to 200 ℃, preserving heat for 1h, finishing the organic silicon modification of the polyester resin, closing the vacuum pump, cooling to about 160 ℃, adding ethylene glycol diethyl ether with the mass of 20% of the resin, stirring uniformly, adding calculated amount of trimellitic anhydride, heating to 210 ℃, preserving heat for about 2h, sampling to measure the acid value, and after the acid value approaches to the theoretical value, finishing the end-capping reaction, cooling to below 100 ℃, adding DMEA (dimethyl ether) to neutralize until the pH value is 7.5-9, thus obtaining the water-based silicon modified polyester resin;
(3) Sequentially weighing 30-50 parts of water-based silicon modified polyester resin, 15-30 parts of pigment, 2-8 parts of dispersing agent, 10-40 parts of water, 0.2-0.6 part of defoaming agent and 1-4 parts of pH regulator into a dispersing cylinder, dispersing the materials for 40min under the condition of 800r/min until the materials are uniformly dispersed, and grinding the materials with a sand mill until the fineness is less than or equal to 10 mu m to prepare color paste for standby;
(4) According to the weight portion, sequentially weighing 20 to 40 portions of water-based silicon modified polyester resin, 5 to 15 portions of water-based hydroxypropyl resin, 10 to 25 portions of amino resin, 5 to 20 portions of filler, 0.2 to 2 portions of catalyst, 0.5 to 1.5 portions of adhesion promoter, 0.3 to 1 portion of flatting agent, 0.3 to 0.8 portion of defoamer, 0.2 to 1.5 portions of thickening auxiliary agent, 1 to 10 portions of cosolvent, 10 to 40 portions of deionized water and 1 to 6 portions of pH regulator, and uniformly dispersing the materials under the condition of 1200r/min to prepare gloss oil for standby;
(5) And (3) mixing the color paste obtained in the step (3) and the gloss oil obtained in the step (4) according to a certain proportion, dispersing uniformly, and adjusting the mixture to a certain viscosity by using water to prepare the corrosion-resistant water-based silicon modified polyester can-making paint.
The corrosion-resistant water-base silicon modified polyester paint for making can is prepared through rolling coating to metal substrate and baking at 180-200 deg.c for 10-30S. The coating thickness is 3-20 μm.
The corrosion-resistant water-based silicon modified polyester can-making paint can be used for tinplate, cold-rolled steel plates, galvanized steel plates, aluminized zinc plates and the like.
Compared with oily products, the corrosion-resistant water-based silicon modified polyester can-making paint can reduce VOC (volatile organic compound) emission by more than 10 ten thousand tons per year in China.
The corrosion-resistant water-based silicon modified polyester can-making paint is environment-friendly, and has the advantages of high T-bend resistance, stamping resistance, excellent post-processing performance, high flexibility, acid resistance, alkali resistance, salt mist resistance, uv resistance, good quick drying performance and the like.
The invention solves the defects of the water-based can-making paint that the performances such as weather resistance, bending resistance and the like are inferior to those of oily products.
The invention solves the adhesion problem of the substrate and can meet the requirement of high performance of the coating by selecting adhesion promoters with different characteristics.
The invention successfully solves the problem of overlong baking time required by the water-based can-making paint by reasonably proportioning the silicon modified polyester resin, the hydroxyl resin and the amino and selecting the variety of the acid catalyst, particularly by reasonably selecting the dosage of the acid catalyst when different amino resins are proportioned, thereby reaching or being superior to the curing time required by the oily similar paint.
The water-based can-making paint belongs to water-based products, has low VOC, plays a great role in protecting the health of production personnel, has extremely high economic and social benefits, and promotes the healthy development of society and enterprises.
Detailed Description
In order to better explain the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described in the following in conjunction with examples in the embodiments of the present invention, and the described embodiments are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art without making any inventive effort, are intended to be within the scope of the present invention.
Embodiment one:
(1) Synthesis of aqueous silicon modified polyester resin: adding 5 parts of pentaerythritol, 15 parts of 1, 4-butanediol, 80 parts of trimethylolpropane, 70 parts of isophthalic acid, 10 parts of terephthalic acid, 40 parts of adipic acid and 0.5 part of catalyst into a reaction kettle in sequence, and filling N 2 Heating to 170 ℃, preserving heat for 0.6h, continuously heating to 225 ℃, preserving heat for esterification for about 3h, sampling and measuring the acid value of the reactantStopping introducing N when the acid value reaches about 10mgKOH/g and the reaction is completed 2 . Obtaining hydroxyl-terminated polyester resin with a certain branching degree;
(2) Cooling the synthesized hydroxyl-terminated polyester resin to 155 ℃, adding 80 parts of organosilicon resin dakangnin R-0806 under the stirring state, adding 0.6 part of titanium compound catalyst, starting a vacuum pump to control the vacuum degree of a reaction system to be 0.01MPa, slowly heating to 200 ℃, preserving heat for 1h, finishing organosilicon modification of the polyester resin, closing the vacuum pump, cooling to about 160 ℃, adding ethylene glycol diethyl ether with the mass of 20% of the resin, stirring uniformly, adding 50 parts of trimellitic anhydride, heating to 210 ℃, preserving heat for about 2h, sampling and measuring an acid value, cooling to below 100 ℃ according to the completion of the end-capping reaction when the acid value is close to the theoretical value, and adding DMEA to neutralize to the pH value of 7.5-9 to obtain the water-based silicon modified polyester resin;
(3) Sequentially weighing 35 parts of the water-based silicone modified polyester resin synthesized by the steps, 15 parts of red pigment, 2 parts of dispersing agent, 40 parts of water, 0.2 part of defoaming agent and 2 parts of pH regulator into a dispersing cylinder according to parts by weight, dispersing the materials for 40min under the condition of 800r/min until the materials are uniformly dispersed, and grinding the materials with a sand mill until the fineness is less than or equal to 10 mu m to prepare color paste for standby;
(4) 40 parts of water-based silicon modified polyester resin, 15 parts of water-based hydroxypropyl resin with the hydroxyl value of 80mgKOH/g, 15 parts of amino resin, 10 parts of aluminum phosphate, 2 parts of catalyst, 0.5 part of adhesion promoter, 0.3 part of flatting agent, 0.3 part of defoamer, 1.5 parts of thickening aid, 5 parts of cosolvent, 40 parts of deionized water and 2 parts of pH regulator are sequentially weighed according to parts by weight, and the materials are uniformly dispersed under the condition of 1200r/min to prepare gloss oil for standby;
(5) And (3) mixing the color paste obtained in the step (3) and the gloss oil obtained in the step (4) according to a certain proportion, dispersing uniformly, and adjusting the mixture to a certain viscosity by using water to prepare the corrosion-resistant water-based silicon modified polyester can-making paint.
Embodiment two:
(1) Synthesis of aqueous silicon modified polyester resin: 15 parts of 1, 2-propylene glycol, 15 parts of 1, 4-butanediol, 10 parts of 1, 6-hexanediol and trimethylol70 parts of base propane, 60 parts of isophthalic acid, 15 parts of terephthalic acid, 45 parts of glutaric acid and 0.5 part of catalyst are sequentially added into a reaction kettle, and N is filled in 2 Heating to 175 ℃, preserving heat for 0.6h, continuously heating to 230 ℃, preserving heat for esterification for about 3h, sampling and measuring the acid value of the reactant, and stopping introducing N according to the completion of the reaction when the acid value reaches about 10mgKOH/g 2 . Obtaining hydroxyl-terminated polyester resin with a certain branching degree;
(2) Cooling the synthesized hydroxyl-terminated polyester resin to 155 ℃, adding 40 parts of organosilicon resin dakaning R-6018 and 35 parts of R-0249 under the stirring state, adding 0.5 part of titanium compound catalyst, starting a vacuum pump to control the vacuum degree of a reaction system to be 0.01MPa, slowly heating to 200 ℃, preserving heat for 1h, finishing organosilicon modification of the polyester resin, closing the vacuum pump, cooling to about 160 ℃, adding ethylene glycol diethyl ether with the mass of 22% of the resin, uniformly stirring, adding 30 parts of succinic anhydride and 15 parts of acetic anhydride, heating to 210 ℃, preserving heat for about 2h, sampling and measuring an acid value, and when the acid value approaches to a theoretical value, finishing the end-capping reaction, cooling to below 100 ℃, adding DMEA to neutralize to the pH value to 7.5-9 to obtain the water-based silicon modified polyester resin;
(3) Sequentially weighing 38 parts of the water-based silicon modified polyester resin synthesized in the steps, 12 parts of blue pigment, 2 parts of dispersing agent, 35 parts of water, 0.3 part of defoaming agent and 2 parts of pH regulator into a dispersing cylinder according to parts by weight, dispersing the materials for 40min under the condition of 800r/min until the materials are uniformly dispersed, and grinding the materials with a sand mill until the fineness is less than or equal to 10 mu m to prepare color paste for standby;
(4) 38 parts of aqueous silicon modified polyester resin, 18 parts of aqueous hydroxypropyl resin with the hydroxyl value of 100mgKOH/g, 13 parts of amino resin, 10 parts of barium sulfate, 2 parts of catalyst, 0.5 part of adhesion promoter, 0.3 part of flatting agent, 0.3 part of defoamer, 1 part of thickening aid, 3 parts of cosolvent, 35 parts of deionized water and 2 parts of pH regulator are sequentially weighed according to parts by weight, and the materials are uniformly dispersed under the condition of 1200r/min to prepare gloss oil for standby;
(5) And (3) mixing the color paste obtained in the step (3) and the gloss oil obtained in the step (4) according to a certain proportion, dispersing uniformly, and adjusting the mixture to a certain viscosity by using water to prepare the corrosion-resistant water-based silicon modified polyester can-making paint.
Embodiment III:
(1) Synthesis of aqueous silicon modified polyester resin: 15 parts of 1, 2-propylene glycol, 18 parts of dipropylene glycol, 8 parts of 1, 6-hexanediol, 65 parts of trimethylolpropane, 60 parts of isophthalic acid, 15 parts of terephthalic acid, 45 parts of glutaric acid, 10 parts of succinic acid and 0.5 part of catalyst are sequentially added into a reaction kettle, and N is filled in 2 Heating to 175 ℃, preserving heat for 0.6h, continuously heating to 230 ℃, preserving heat for esterification for about 3h, sampling and measuring the acid value of the reactant, and stopping introducing N according to the completion of the reaction when the acid value reaches about 10mgKOH/g 2 . Obtaining hydroxyl-terminated polyester resin with a certain branching degree;
(2) Cooling the synthesized hydroxyl-terminated polyester resin to 155 ℃, adding 20 parts of organosilicon resin dakaning R-6018 and 30 parts of dakaning R-5314 under the stirring state, adding 0.5 part of titanium compound catalyst, starting a vacuum pump to control the vacuum degree of a reaction system to be 0.01MPa, slowly heating to 200 ℃, preserving heat for 1h, finishing organosilicon modification of the polyester resin, closing the vacuum pump, cooling to about 160 ℃, adding ethylene glycol diethyl ether with the mass of 25%, stirring uniformly, adding 35 parts of succinic anhydride and 15 parts of propionic anhydride, heating to 210 ℃, preserving heat for about 2h, sampling to determine an acid value, and when the acid value is close to a theoretical value, according to the completion of end-capping reaction, cooling to below 100 ℃, adding DMEA to neutralize to the pH value to 7.5-9 to obtain the water-based silicon-modified polyester resin;
(3) Sequentially weighing 39 parts of the water-based silicone modified polyester resin synthesized in the steps, 10 parts of yellow pigment, 2 parts of dispersing agent, 35 parts of water, 0.3 part of defoaming agent and 2 parts of pH regulator into a dispersing cylinder according to parts by weight, dispersing the materials for 40min under the condition of 800r/min until the materials are uniformly dispersed, and grinding the materials with a sand mill until the fineness is less than or equal to 10 mu m to prepare color paste for standby;
(4) 37 parts of water-based silicon modified polyester resin, 20 parts of water-based hydroxypropyl resin with the hydroxyl value of 110mgKOH/g, 17 parts of amino resin, 10 parts of mica powder, 2 parts of catalyst, 0.5 part of adhesion promoter, 0.3 part of flatting agent, 0.3 part of defoamer, 1 part of thickening auxiliary agent, 3 parts of cosolvent, 35 parts of deionized water and 2 parts of pH regulator are sequentially weighed according to parts by weight, and the materials are uniformly dispersed under the condition of 1200r/min to prepare gloss oil for standby;
(5) And (3) mixing the color paste obtained in the step (3) and the gloss oil obtained in the step (4) according to a certain proportion, dispersing uniformly, and adjusting the mixture to a certain viscosity by using water to prepare the corrosion-resistant water-based silicon modified polyester can-making paint.
Embodiment four:
(1) Synthesis of aqueous silicon modified polyester resin: adding 5 parts of ethylene glycol, 10 parts of 1, 2-propylene glycol, 15 parts of dipropylene glycol, 9 parts of 1, 6-hexanediol, 68 parts of trimethylolpropane, 60 parts of succinic acid, 15 parts of terephthalic acid, 40 parts of glutaric acid, 10 parts of adipic acid and 0.5 part of catalyst into a reaction kettle in sequence, and filling N 2 Heating to 175 ℃, preserving heat for 0.6h, continuously heating to 230 ℃, preserving heat for esterification for about 3h, sampling and measuring the acid value of the reactant, and stopping introducing N according to the completion of the reaction when the acid value reaches about 10mgKOH/g 2 . Obtaining hydroxyl-terminated polyester resin with a certain branching degree;
(2) Cooling the synthesized hydroxyl-terminated polyester resin to 155 ℃, adding 25 parts of organosilicon resin dakaning R-0804 and 35 parts of dakaning R-0805 under the stirring state, adding 0.6 part of titanium compound catalyst, starting a vacuum pump to control the vacuum degree of a reaction system to be 0.01MPa, slowly heating to 200 ℃, preserving heat for 1h, finishing organosilicon modification of the polyester resin, closing the vacuum pump, cooling to about 160 ℃, adding ethylene glycol diethyl ether with the mass of 25%, stirring uniformly, adding 35 parts of pyromellitic anhydride and 15 parts of maleic anhydride, heating to 210 ℃, preserving heat for about 2h, sampling to determine an acid value, and when the acid value is close to a theoretical value, finishing the end-capping reaction, cooling to below 100 ℃, adding DMEA to neutralize until the pH value is 7.5-9, thus obtaining the water-based silicon modified polyester resin;
(3) Sequentially weighing 30 parts of the water-based silicon modified polyester resin synthesized in the steps, 30 parts of white pigment, 1.5 parts of dispersing agent, 30 parts of water, 0.3 part of defoaming agent and 2 parts of pH regulator into a dispersing cylinder according to parts by weight, dispersing the materials for 40min under the condition of 800r/min until the materials are uniformly dispersed, and grinding the materials with a sand mill until the fineness is less than or equal to 10 mu m to prepare color paste for standby;
(4) According to the weight portion, 35 portions of water-based silicon modified polyester resin, 18 portions of water-based hydroxypropyl resin with the hydroxyl value of 95mgKOH/g, 16 portions of amino resin, 10 portions of zinc phosphate, 2 portions of catalyst, 0.5 portion of adhesion promoter, 0.3 portion of flatting agent, 0.3 portion of defoamer, 1 portion of thickening auxiliary agent, 3 portions of cosolvent, 30 portions of deionized water and 2 portions of pH regulator are sequentially weighed, and the materials are uniformly dispersed under the condition of 1200r/min to prepare gloss oil for standby;
(5) And (3) mixing the color paste obtained in the step (3) and the gloss oil obtained in the step (4) according to a certain proportion, dispersing uniformly, and adjusting the mixture to a certain viscosity by using water to prepare the corrosion-resistant water-based silicon modified polyester can-making paint.
Comparative example one:
(1) Sequentially weighing 30 parts of common polyester resin, 30 parts of white pigment, 1.5 parts of dispersing agent, 30 parts of water, 0.3 part of defoaming agent and 2 parts of pH regulator according to parts by weight into a dispersing cylinder, dispersing the materials for 40min under the condition of 800r/min until the materials are uniformly dispersed, and grinding the materials with a sand mill until the fineness is less than or equal to 10 mu m to prepare color paste for later use;
(2) According to the weight portion, 45 portions of common polyester resin, 16 portions of amino resin, 10 portions of zinc phosphate, 2 portions of catalyst, 0.5 portion of adhesion promoter, 0.3 portion of flatting agent, 0.3 portion of defoamer, 1 portion of thickening auxiliary agent, 3 portions of cosolvent, 30 portions of deionized water and 2 portions of pH regulator are sequentially weighed, and the materials are uniformly dispersed under the condition of 1200r/min to prepare gloss oil for standby;
(3) And (3) mixing the color paste obtained in the step (1) and the gloss oil obtained in the step (2) according to a certain proportion, uniformly dispersing, and adjusting the mixture to a certain viscosity by using water to prepare the polyester can-making paint.
Control II:
(1) Weighing 40 parts of common polyester resin, 15 parts of blue pigment, 3 parts of dispersing agent, 30 parts of water, 0.3 part of defoaming agent and 2 parts of pH regulator in sequence according to parts by weight, dispersing the materials for 40min under the condition of 800r/min until the materials are uniformly dispersed, and grinding the materials with a sand mill until the fineness is less than or equal to 10 mu m to prepare color paste for later use;
(2) 40 parts of common polyester resin, 13 parts of amino resin, 10 parts of barium sulfate, 2 parts of catalyst, 0.5 part of adhesion promoter, 0.3 part of flatting agent, 0.3 part of defoamer, 1 part of thickening aid, 3 parts of cosolvent, 30 parts of deionized water and 2 parts of pH regulator are sequentially weighed according to parts by weight, and the materials are uniformly dispersed to prepare gloss oil for standby under the condition of 1200 r/min;
(3) And (3) mixing the color paste obtained in the step (1) and the gloss oil obtained in the step (2) according to a certain proportion, uniformly dispersing, and adjusting the mixture to a certain viscosity by using water to prepare the polyester can-making paint.
The performance of the paint film coatings prepared by the products of the first to fourth examples and the first to second comparative examples is compared and tested, and the test results are shown in the attached table 1, and the performances of corrosion resistance, folding resistance, hardness and the like are obviously better than those of the comparative examples.
Table 1
The above examples are only illustrative of the invention and are not intended to limit the embodiments of the invention. Other variations and modifications of the various aspects will be apparent to those of skill in the art and it is not necessary nor intended to be exhaustive of all embodiments. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the invention are desired to be protected by the following claims.
Claims (8)
1. The corrosion-resistant water-based silicon modified polyester can-making paint is characterized by being prepared by the following preparation method:
adding polybasic acid, polyhydric alcohol and catalyst into a reaction kettle according to a certain proportion, and filling N 2 Heating to 170 ℃, preserving heat for 0.6h, continuously heating to 225 ℃, preserving heat for esterification for 3h, sampling and measuring the acid value of the reactant to obtain the acid value reaching 10mgKOH/g,stopping the N flow when the reaction is completed 2 Obtaining hydroxyl-terminated polyester resin with a certain branching degree;
cooling the synthesized hydroxyl-terminated polyester resin to 155 ℃, adding an organic silicon resin and a titanium compound catalyst under the stirring state, starting a vacuum pump to control the vacuum degree of a reaction system to be 0.01MPa, slowly heating to 200 ℃, preserving heat for 1h, finishing the organic silicon modification of the polyester resin, closing the vacuum pump, cooling to 160 ℃, adding ethylene glycol diethyl ether with the mass of 20% of the resin, uniformly stirring, adding calculated amount of trimellitic anhydride, heating to 210 ℃, preserving heat for 2h, sampling to determine an acid value, and when the acid value is close to a theoretical value, finishing the end-capping reaction, cooling to 100 ℃ or lower, adding DMEA, and neutralizing until the pH value is 7.5-9, thus obtaining the water-based silicon modified polyester resin;
sequentially weighing 30-50 parts of water-based silicon modified polyester resin, 15-30 parts of pigment, 2-8 parts of dispersing agent, 10-40 parts of water, 0.2-0.6 part of defoaming agent and 1-4 parts of pH regulator into a dispersing cylinder according to parts by weight, dispersing the materials for 40min under the condition of 800r/min until the materials are uniformly dispersed, and grinding the materials with a sand mill until the fineness is less than or equal to 10 mu m to prepare color paste for standby;
according to the weight portion, sequentially weighing 20 to 40 portions of water-based silicon modified polyester resin, 5 to 15 portions of water-based hydroxypropyl resin, 10 to 25 portions of amino resin, 5 to 20 portions of filler, 0.2 to 2 portions of catalyst, 0.5 to 1.5 portions of adhesion promoter, 0.3 to 1 portion of flatting agent, 0.3 to 0.8 portion of defoamer, 0.2 to 1.5 portions of thickening auxiliary agent, 1 to 10 portions of cosolvent, 10 to 40 portions of deionized water and 1 to 6 portions of pH regulator, and uniformly dispersing the materials under the condition of 1200r/min to prepare gloss oil for standby; the adhesion promoter is as follows: any one or more of silane coupling agent, titanate coupling agent and aluminate coupling agent are mixed;
and (3) mixing the color paste obtained in the step A and the gloss oil obtained in the step B according to a certain proportion, uniformly dispersing, and adjusting the mixture to a certain viscosity by using water to prepare the corrosion-resistant water-based silicon modified polyester can-making paint.
2. The corrosion resistant aqueous silicon modified polyester can coating of claim 1, wherein the aqueous hydroxypropyl resin used is: one or more of phenylpropoxy resin and pure propyloxy resin; the amino resin is as follows: at least one of a fully methylated amino resin, a partially methylated amino resin, a butylated amino resin and a methyl butyl mixed etherified amino resin.
3. The corrosion resistant aqueous silicon modified polyester can coating of claim 1, wherein the pigment is: one or more of violet pigment, organic green pigment, organic red pigment, iron oxide yellow pigment; the filler is one or more of titanium dioxide, carbon black, barium sulfate, extinction powder, zinc phosphate, aluminum tripolyphosphate and mica powder.
4. The corrosion resistant aqueous silicon modified polyester can-making paint of claim 1, wherein the catalyst is: one or more combinations of p-toluenesulfonic acid, dodecylbenzenesulfonic acid, isooctanoic acid, modified dinonylnaphthalene disulfonic acid, modified dinonylnaphthalene sulfonic acid; the defoamer is as follows: any one or more of polyether siloxane, acrylic ester, polyether modified dimethyl siloxane and polyester modified polysiloxane are mixed.
5. The corrosion resistant aqueous silicon modified polyester can-making paint of claim 1, wherein the dispersant is: one or more of anionic wetting dispersant, cationic wetting dispersant, nonionic wetting dispersant, amphoteric wetting dispersant, and electrically neutral wetting agent.
6. The corrosion resistant aqueous silicon modified polyester can-making paint of claim 1, wherein the pH adjuster is: one or more of dimethylethanolamine, monoethanolamine, ammonia, and AMP 95.
7. A corrosion resistant aqueous silicon modified polyester can coating according to any one of claims 1 to 6, prepared by the following method:
adding polybasic acid, polyhydric alcohol and catalyst into a reaction kettle according to a certain proportion, and filling N 2 Heating to 170deg.C, maintaining the temperature for 0.6 hr, continuously heating to 225 deg.C, maintaining the temperature for esterification for 3 hr, sampling, and determining acid value of reactant to obtain acid value of 10mgKOH/g, and stopping introducing N when the reaction is completed 2 Obtaining hydroxyl-terminated polyester resin with a certain branching degree;
cooling the synthesized hydroxyl-terminated polyester resin to 155 ℃, adding an organic silicon resin and a titanium compound catalyst under the stirring state, starting a vacuum pump to control the vacuum degree of a reaction system to be 0.01MPa, slowly heating to 200 ℃, preserving heat for 1h, finishing the organic silicon modification of the polyester resin, closing the vacuum pump, cooling to 160 ℃, adding ethylene glycol diethyl ether with the mass of 20% of the resin, uniformly stirring, adding calculated amount of trimellitic anhydride, heating to 210 ℃, preserving heat for 2h, sampling to determine an acid value, and when the acid value is close to a theoretical value, finishing the end-capping reaction, cooling to 100 ℃ or lower, adding DMEA, and neutralizing until the pH value is 7.5-9, thus obtaining the water-based silicon modified polyester resin;
the polyol is as follows: one or more of pentaerythritol, ethylene glycol 1, 2-propylene glycol, 1, 4-butanediol, 1, 6-hexanediol, 1, 4-cyclohexanedimethanol, neopentyl glycol, 1, 5-pentanediol, neopentyl glycol, diethylene glycol, dipropylene glycol, trimethylolpropane and glycerol;
the polyacid is as follows: one or more of isophthalic acid, terephthalic acid, succinic acid, adipic acid, hexahydrophthalic anhydride, glutaric acid and 1, 4-cyclohexanedicarboxylic acid;
the organic silicon resin comprises the following components: one or more of R-0806, R-6018, R-0249, R-5314, R-0805, R-0804 of Dow Corning.
8. The corrosion-resistant aqueous silicon-modified polyester can-making paint as claimed in any one of claims 2 to 6, characterized in that the preparation method thereof comprises the steps of:
sequentially weighing 30-50 parts by weight of water-based silicon modified polyester resin, 15-30 parts by weight of pigment, 2-8 parts by weight of dispersing agent, 10-40 parts by weight of water, 0.2-0.6 part by weight of defoaming agent and 1-4 parts by weight of pH regulator into a dispersing cylinder, dispersing the materials for 40min under the condition of 800r/min until the materials are uniformly dispersed, and grinding the materials to fineness by a sand mill
Making color paste with the thickness of less than or equal to 10 mu m for standby;
the preparation method comprises the following steps of sequentially weighing 20-40 parts by weight of water-based silicon modified polyester resin, 5-15 parts by weight of water-based hydroxypropyl resin, 10-25 parts by weight of amino resin, 5-20 parts by weight of filler, 0.2-2 parts by weight of catalyst, 0.5-1.5 parts by weight of adhesion promoter, 0.3-1 part by weight of flatting agent, 0.3-0.8 part by weight of defoamer, 0.2-1.5 parts by weight of thickening auxiliary agent, 1-10 parts by weight of cosolvent, 10-40 parts by weight of deionized water and 1-6 parts by weight of pH regulator, and uniformly dispersing the materials under the condition of 1200r/min to prepare gloss oil for later use;
and C, mixing the color paste obtained in the step A and the gloss oil obtained in the step B according to a certain proportion, dispersing uniformly, and adjusting the viscosity to a certain viscosity by using water to prepare the corrosion-resistant water-based silicon modified polyester can-making paint.
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| CN110577614B (en) * | 2019-10-18 | 2021-07-20 | 江苏富琪森新材料有限公司 | Preparation of high-solid-content hydroxy acrylic acid dispersion |
| CN114456685B (en) * | 2021-12-30 | 2023-08-01 | 杭州吉华高分子材料股份有限公司 | Water-based heat-resistant anticorrosive paint with magnetic conduction function and preparation method thereof |
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