CN108587382B - Water-based gloss oil for metal and preparation method thereof - Google Patents
Water-based gloss oil for metal and preparation method thereof Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F283/00—Macromolecular compounds obtained by polymerising monomers on to polymers provided for in subclass C08G
- C08F283/01—Macromolecular compounds obtained by polymerising monomers on to polymers provided for in subclass C08G on to unsaturated polyesters
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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
- C09D151/00—Coating compositions based on graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds; Coating compositions based on derivatives of such polymers
- C09D151/08—Coating compositions based on graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds; Coating compositions based on derivatives of such polymers grafted on to macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
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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
- C09D5/18—Fireproof paints including high temperature resistant paints
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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
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/65—Additives macromolecular
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
Abstract
In order to overcome the problem that the boiling resistance and the wear resistance of the existing pop can external gloss oil are insufficient, the invention provides water-based gloss oil for metal, which comprises the following components in parts by mass: 40-60 parts of polyester modified waterborne acrylic resin, 5-20 parts of liquid petroleum resin, 5-15 parts of amino resin, 2-8 parts of closed isocyanate, 0.1-0.5 part of organic acid catalyst, 5-15 parts of cosolvent and 10-20 parts of water. Meanwhile, the invention also discloses a preparation method of the water-based gloss oil for metals. The water-based gloss oil for metals provided by the invention has excellent high-temperature cooking resistance and wear resistance, can fully meet the requirements of pop cans in production and application processes, and each technical performance of a paint film reaches or exceeds the technical level of the existing like products.
Description
Technical Field
The invention belongs to the technical field of water-based paint, and particularly relates to water-based gloss oil for metal and a preparation method thereof.
Background
The pop can has the advantages of light weight, small volume, difficult breakage and convenient carrying, is popular with people and is widely applied to containing beer, carbonated beverage, herbal tea, milk and other foods. At present, the cans on the market are generally coated with printing ink and gloss oil to protect and beautify the can bodies, so that the gloss oil on the outermost layer is required to have good chemical stability and wear resistance in the production, storage and transportation processes of the cans. In the production process of part of pop can food, the contents of the pop can need to be steamed and sterilized, and therefore the external gloss oil of the pop can also needs to have the steaming-resistant characteristic. However, the existing pop can external gloss oil has defects in boiling resistance and wear resistance, especially in high-temperature boiling (such as boiling at 121 ℃). Therefore, it is necessary to develop a water-based varnish for metals, which is resistant to high temperature cooking and abrasion.
Disclosure of Invention
Aiming at the problem that the boiling resistance and the wear resistance of the existing pop can external gloss oil are insufficient, the invention provides water-based gloss oil for metal and a preparation method thereof.
The technical scheme adopted by the invention for solving the technical problems is as follows:
on one hand, the invention provides water-based gloss oil for metals, which comprises the following components in parts by mass:
40-60 parts of polyester modified waterborne acrylic resin, 5-20 parts of liquid petroleum resin, 5-15 parts of amino resin, 2-8 parts of closed isocyanate, 0.1-0.5 part of organic acid catalyst, 5-15 parts of cosolvent and 10-20 parts of water.
According to the water-based gloss oil for metals, the polyester modified water-based acrylic resin is adopted, and the liquid petroleum resin, the amino resin and the closed isocyanate are matched, so that the proportion of the compounds is adjusted and optimized, the reasonable crosslinking density is achieved, and the coating has good water resistance, high-temperature cooking resistance and hardness. The organic acid catalyst is beneficial to improving the curing efficiency of the organic acid catalyst. In addition, the synergistic use of the blocked isocyanate and the liquid petroleum resin also improves the mechanical processing property and the wear resistance of the paint film.
Optionally, the mass ratio of the polyester modified waterborne acrylic resin to the liquid petroleum resin to the amino resin to the blocked isocyanate is 45-55: 8-15: 5-10: 3 to 5.
Optionally, the polyester-modified waterborne acrylic resin is obtained by polymerizing a polymerization monomer, wherein the polymerization monomer comprises unsaturated polyester, an acrylate monomer, a hydroxyl-containing acrylate monomer and a carboxyl-containing acrylate monomer.
Optionally, the unsaturated polyester contains a cyclic structure, the solid content is 70%, the glass transition temperature is-20 ℃, the acid value is 15-35 mg KOH/g, and the unsaturation degree is 10-15; the acrylate monomer is selected from at least two of styrene, methyl (meth) acrylate and butyl (meth) acrylate; the hydroxyl-containing acrylate monomer is hydroxyethyl (meth) acrylate; the carboxyl-containing acrylate monomer is (methyl) acrylic acid.
Optionally, the liquid petroleum resin is a C9/C10 unsaturated aromatic hydrocarbon polymer.
Optionally, the liquid petroleum resin is selected from one or more of novals TD90, TD90D, TD100 and TD 100D.
Optionally, the amino resin is selected from one or more of Resimene 717, Resimene 747, CYMEL 303, CYMEL 350 and OS 303-98 amino resin.
Optionally, the blocked isocyanate is selected from one or more of Takenate WB-3021, VESTANAT B1358/100, Rhodocoat WT1000, Bayhydrol BL 5140 and Bayhydrol D155.
Optionally, the organic acid catalyst is selected from one or more of Powderlink MTSI, AD3325 DNNDSA, NACURE 155DNNDSA, AD3315DNNSA and AD3302W p-TSA.
Optionally, the cosolvent is selected from one or more of isopropanol, n-butanol, isobutanol, ethylene glycol monobutyl ether and diethylene glycol monobutyl ether.
Optionally, the aqueous gloss oil for metals further comprises 0.1-0.5 part by mass of a defoaming agent.
The defoaming agent is selected from one or more of BYK-020, BYK-024, Tech-371w, Tego-810 and Tego Airex 901 w.
Optionally, the aqueous gloss oil for metals further comprises 0.1-0.5 part by mass of a leveling agent.
The leveling agent is selected from one or more of BYK-380N, BYK-381, BYK-378, EFKA-3035 and EFKA-3772.
Optionally, the aqueous gloss oil for metals further comprises 0.5-2 parts by mass of polyfluorinated wax.
The polyfluoro wax is selected from one or more of Polyfluo120, Polyfluo150, Polyfluo190, Polyfluo200 and Polyfluo 400.
On the other hand, the invention provides a preparation method of the water-based gloss oil for metals, which comprises the following steps:
feeding: sequentially adding the polyester modified waterborne acrylic resin, part of cosolvent, liquid petroleum resin, amino resin, blocked isocyanate and organic acid catalyst into part of water under stirring, and uniformly stirring;
adjusting the viscosity: sampling to test the viscosity, adding the rest water and the rest cosolvent, and adjusting the viscosity to 90 +/-10 s;
obtaining the water-based varnish for metals.
Optionally, the stirring speed is 600-800 r/min.
The water-based gloss oil for metals prepared by the preparation method has excellent high-temperature cooking resistance and wear resistance, can fully meet the requirements of pop cans in production and application processes, and has various technical properties of a paint film reaching or exceeding the technical level of the existing like products.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects solved by the present invention more apparent, the present invention is further described in detail below with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The embodiment of the invention provides water-based gloss oil for metals, which comprises the following components in parts by mass:
40-60 parts of polyester modified waterborne acrylic resin, 5-20 parts of liquid petroleum resin, 5-15 parts of amino resin, 2-8 parts of closed isocyanate, 0.1-0.5 part of organic acid catalyst, 5-15 parts of cosolvent and 10-20 parts of water.
According to the water-based gloss oil for metals, the polyester modified water-based acrylic resin is adopted, and the liquid petroleum resin, the amino resin and the closed isocyanate are matched, so that the proportion of the compounds is adjusted and optimized, the reasonable crosslinking density is achieved, and the coating has good water resistance, high-temperature cooking resistance and hardness. The organic acid catalyst is beneficial to improving the curing efficiency of the organic acid catalyst. In addition, the synergistic use of the blocked isocyanate and the liquid petroleum resin also improves the mechanical processing property and the wear resistance of the paint film.
In some preferred embodiments, the mass ratio of the polyester modified waterborne acrylic resin to the liquid petroleum resin to the amino resin to the blocked isocyanate is 45-55: 8-15: 5-10: 3 to 5.
The inventor finds through a large number of experiments that the polyester-modified waterborne acrylic resin, the liquid petroleum resin, the amino resin and the blocked isocyanate have an interaction promoting effect, and when the amount of the polyester-modified waterborne acrylic resin, the liquid petroleum resin, the amino resin and the blocked isocyanate is in the range, the obtained metal waterborne gloss oil has better boiling resistance and wear resistance; when the amount of the individual components is more or less than the above range, the steaming resistance and the abrasion resistance are deteriorated to some extent.
In some embodiments, the polyester-modified waterborne acrylic resin is polymerized from polymerized monomers including an unsaturated polyester, an acrylate monomer, a hydroxyl-containing acrylate monomer, and a carboxyl-containing acrylate monomer.
The polyester modified waterborne acrylic resin can be obtained by adopting a solution polymerization mode.
In some embodiments, the polyester modified water-based acrylic resin containing a benzene ring and a cyclic structure is adopted, and the polyester modified water-based acrylic resin containing a benzene ring and a cyclic structure has better stability and can improve the boiling resistance of a paint film from a base material.
Specifically, in the adopted polymerization monomers, the unsaturated polyester contains a cyclic structure, the solid content is 70%, the glass transition temperature is-20 ℃, the acid value is 15-35 mg KOH/g, and the unsaturation degree (expressed by iodine value and calculated by non-volatile parts) is 10-15; the acrylate monomer is selected from at least two of styrene, methyl (meth) acrylate and butyl (meth) acrylate; the hydroxyl-containing acrylate monomer is hydroxyethyl (meth) acrylate; the carboxyl-containing acrylate monomer is (methyl) acrylic acid.
The liquid petroleum resin provided by the invention is a byproduct fraction from petroleum cracking, and is a thermoplastic resin produced by processes such as pretreatment, polymerization, distillation and the like, and has the characteristics of low acid value, good miscibility, water resistance, ethanol resistance, chemical resistance and the like.
In some embodiments, the liquid petroleum resin is a C9/C10 unsaturated aromatic hydrocarbon polymer.
In some more preferred embodiments, the liquid petroleum resin is selected from one or more of novals TD90, TD90D, TD100 and TD 100D.
In some embodiments, the amino resin is selected from one or more of Resimene 717, Resimene 747, CYMEL 303, CYMEL 350, and OS 303-98 amino resins.
The amino resin is used as a curing agent and can be crosslinked and cured with the polyester modified waterborne acrylic resin.
In some embodiments, the blocked isocyanate is selected from one or more of Takenate WB-3021, VESTANAT B1358/100, Rhodocoat WT1000, Bayhydrol BL 5140, and Bayhydrol D155.
The blocked isocyanate can stably coexist with resin containing active groups (hydroxyl, carboxyl, amino, epoxy and the like) for a long time at normal temperature, can release-NCO groups through heat treatment and react with the hydroxyl, carboxyl, amino and other groups on a resin molecular chain to form crosslinking, and can obviously improve the performances of a resin paint film such as water resistance, chemical resistance, wear resistance, adhesive force, mechanical and mechanical properties and the like.
The organic acid catalyst is used for catalyzing the reaction of amino resin and polyester modified waterborne acrylic resin.
In some embodiments, the organic acid catalyst is selected from one or more of the group consisting of Powderlink MTSI, AD3325 DNNDSA, naceure 155DNNDSA, AD3315DNNSA, and AD3302W p-TSA.
The cosolvent is used for promoting the dissolution of various components in the aqueous gloss oil for the metal.
In some embodiments, the co-solvent is selected from one or more of isopropanol, n-butanol, isobutanol, ethylene glycol monobutyl ether, and diethylene glycol monobutyl ether.
In some embodiments, the aqueous metal gloss oil further comprises 0.1-0.5 parts by mass of an antifoaming agent for reducing bubbles generated during the preparation of the aqueous metal gloss oil.
The defoaming agent is selected from one or more of BYK-020, BYK-024, Tech-371w, Tego-810 and Tego Airex 901 w.
In some embodiments, the metal-used water-based gloss oil further comprises 0.1-0.5 part by mass of a leveling agent, and the leveling agent is used for reducing the surface tension of the metal-used water-based gloss oil and improving the leveling performance.
The leveling agent is selected from one or more of BYK-380N, BYK-381, BYK-378, EFKA-3035 and EFKA-3772.
In some embodiments, the aqueous gloss oil for metals further comprises 0.5-2 parts by mass of polyfluorinated wax, and the polyfluorinated wax is added into the aqueous gloss oil for metals, so that the lubricating property and the wear-resisting and scratch-resisting properties of a paint film can be further ensured.
The polyfluoro wax is selected from one or more of Polyfluo120, Polyfluo150, Polyfluo190, Polyfluo200 and Polyfluo 400.
The invention also provides a preparation method of the water-based gloss oil for metals, which comprises the following steps:
feeding: sequentially adding the polyester modified waterborne acrylic resin, part of cosolvent, liquid petroleum resin, amino resin, blocked isocyanate and organic acid catalyst into part of water under stirring, and uniformly stirring;
adjusting the viscosity: sampling to test viscosity, adding the rest water and the rest cosolvent, and adjusting the viscosity to 90 +/-10 s (T-4 cup, 25 ℃);
obtaining the water-based varnish for metals.
In the preparation method, the stirring speed is 600-800 r/min.
Specifically, in some embodiments, when the materials are fed, the polyester modified water-based acrylic resin, a part of cosolvent, liquid petroleum resin, amino resin, blocked isocyanate, organic acid catalyst, defoamer, leveling agent and polyfluorinated wax are sequentially added into a part of water under a stirring state, and the mixture is uniformly stirred.
When the viscosity is adjusted, after the mixture is uniformly stirred, sampling and testing various performance indexes, and filtering and packaging after reaching the standard.
The water-based gloss oil for metals prepared by the preparation method has excellent high-temperature cooking resistance and wear resistance, can fully meet the requirements of pop cans in production and application processes, and has various technical properties of a paint film reaching or exceeding the technical level of the existing like products.
The present invention will be further illustrated by the following examples.
Example 1
This example illustrates the aqueous gloss oil for metals and the preparation method thereof disclosed in the present invention.
(1) Synthesis of polyester modified waterborne acrylic resin: 70g of unsaturated polyester (containing a six-membered ring structure, the solid content of the unsaturated polyester is 70 percent, the glass transition temperature is-15 ℃, the acid value is 15mg KOH/g, the unsaturation degree (expressed by an iodine value and calculated by non-volatile parts) is 12.7), 400g of ethylene glycol monobutyl ether and 250g of n-butyl alcohol are put into a reaction kettle, and the reaction temperature is controlled at 120 ℃; 10g of tert-butyl peroxybenzoate (initiator), 100g of methyl methacrylate, 80g of styrene, 150g of butyl acrylate, 300g of hydroxyethyl acrylate and 80g of acrylic acid are uniformly mixed, and then the mixture is dripped into a reaction kettle, and the dripping time is controlled to be 5 hours. After the monomer and the initiator are dripped, the heat preservation time is 3 hours. And then naturally cooling, adding 700g of deionized water and 70g N, N-dimethylethanolamine after cooling to below 50 ℃, stirring for 30 minutes, and filtering to obtain the polyester modified waterborne acrylic resin.
(2) The liquid petroleum resin is NOVARES TD 90D;
the amino resin is CYMEL 303;
the closed isocyanate is Bayhydrol BL 5140;
NACURE 155 is selected as the organic acid catalyst;
the defoaming agent is BYK-024;
the leveling agent is BYK-378;
the polyfluorinated wax is Polyfluo 400;
the cosolvent is ethylene glycol monobutyl ether;
the water is deionized water.
The amounts of the components are as follows: 18 parts of deionized water, 8 parts of ethylene glycol monobutyl ether, 50 parts of HG317-70, 10 parts of NOVARES TD90D, 7 parts of CYMEL 303, 3 parts of Bayhydrol BL 5140, 0.2 part of NACURE 155DNNDSA, 0.3 part of BYK-024, 0.5 part of BYK-378 and 1 part of Polyfluo 400.
Adding 50 parts by mass of HG317-70, 10 parts by mass of NOVARES TD90D, 5 parts by mass of ethylene glycol monobutyl ether, 7 parts by mass of CYMEL 303, 3 parts by mass of Bayhydrol BL 5140, 0.2 part by mass of NACURE 155DNNDSA, 0.3 part by mass of BYK-024, 0.5 part by mass of BYK-378 and 1 part by mass of Polyfluo400 into 15 parts by mass of deionized water in sequence, stirring at 600rpm for 20min, sampling to test the viscosity of the mixed solution, then adding 3 parts by mass of deionized water and 3 parts by mass of ethylene glycol monobutyl ether, stirring for 10min, adjusting the viscosity to 85s (T-4 cup, 25 ℃), filtering and packaging.
Example 2 and example 3
Examples 2 and 3, which are intended to illustrate the aqueous gloss oil for metals and the preparation method thereof disclosed in the present invention, include most of the operating steps in example 1, except that:
the components of the aqueous gloss oil for metals have the compositions and the amounts shown in example 2 and example 3 in Table 1.
Comparative examples 1 to 4
Comparative examples 1 to 4 are comparative illustrations of the aqueous gloss oil for metals and the preparation method thereof disclosed in the present invention, including most of the operation steps in example 1, except that:
the components and the use amount of the water-based gloss oil for metals are shown in comparative examples 1-4 in Table 1.
TABLE 1 compositions of aqueous gloss oils for metals of examples 1-3 and comparative examples 1-4
| Example 1 | Example 2 | Example 3 | Comparative example 1 | Comparative example 2 | Comparative example 3 | Comparative example 4 | |
| Deionized water | 18 | 16 | 17 | 18 | 18 | 18 | 18 |
| Ethylene glycol monobutyl ether | 8 | 10 | 7 | 8 | 8 | 8 | 8 |
| HG317-70 | 50 | 45 | 52 | 50 | 50 | 50 | 50 |
| NOVARES TD90D | 10 | 12 | 8 | 0 | 25 | 10 | 10 |
| Bayhydrol BL 5140 | 3 | 4 | 4 | 3 | 3 | 0 | 10 |
| CYMEL 303 | 7 | 6 | 8 | 7 | 7 | 7 | 7 |
| NACURE 155 | 0.2 | 0.2 | 0.2 | 0.2 | 0.2 | 0.2 | 0.2 |
| BYK-024 | 0.3 | 0.3 | 0.3 | 0.3 | 0.3 | 0.3 | 0.3 |
| BYK-378 | 0.5 | 0.5 | 0.5 | 0.5 | 0.5 | 0.5 | 0.5 |
| Polyfluo400 | 1 | 1 | 1 | 1 | 1 | 1 | 1 |
Note: all numerical values in Table 1 are in parts by mass
Performance testing
The following performance tests were performed on the aqueous gloss oil for metals prepared in examples 1 to 3 and comparative examples 1 to 4:
(1) the aqueous gloss oil for metals prepared in examples 1-3 and comparative examples 1-4 is respectively and uniformly coated on an A4 aluminum plate with the surface subjected to cleaning treatment, the thickness of the aluminum plate is 3 micrometers, the aluminum plate is baked in an oven at 205 ℃ for 2min, and then a test sample is taken out and naturally cooled.
(2) Detecting performance index of water-based gloss oil for metal on aluminum material
Solvent resistance: a1 kg iron hammer is wrapped by gauze, a test sample plate with a certain thickness is wiped after being dipped in butanone, and the number of times of wiping is recorded once after wiping until the substrate is exposed.
High temperature cooking resistance: adding water into a pressure cooker, putting a test sample plate to be detected into the pressure cooker, covering the pressure cooker, powering on a power supply to start heating, starting to record when the temperature reaches 121 ℃, turning off the power supply after cooking for 60min, opening the pressure cooker cover to take out the test sample plate after the pressure is relieved, and checking whether a paint film of the test sample plate turns white and falls off.
Hardness: the hardness of the paint film was determined using a pencil of known hardness, with the pencil hardness being such that the paint film was not scratched.
Adhesion force: preparing a test sample plate according to a general method for detecting the coating, vertically crossing the test sample plate by using a lattice scriber to scribe hundreds of lattices on the test sample plate, and then adhering the test sample plate by using a 3M adhesive tape. The 0 grade is optimal and does not fall off completely; grade 5 is worst, and the shedding area is more than 65%.
Abrasion resistance: a Taber test method is adopted, the rotating speed of a rotating disc is 60r/min, a pressurizing arm bears 1kg of load, a hard rubber friction wheel embedded with carborundum abrasive materials is used for wearing the surface of a paint film, and the number of turns required for the paint film to be worn out and exposed out of a substrate is recorded.
(3) And (3) detection results: see table 2.
TABLE 2 Performance index of the paint film plate made of the aqueous gloss oil for metals of examples 1-3 and comparative examples 1-4
| Solvent resistance | Resistance to high temperature cooking | Hardness of | Adhesion force | Wear resistance | |
| Example 1 | >100 | No blushing and no falling off | 3H | Level 0 | 200 |
| Example 2 | >100 | No blushing and no falling off | 3H | Level 0 | 190 |
| Example 3 | >100 | No blushing and no falling off | 3H | Level 0 | 185 |
| Comparative example 1 | 50 | Severe blushing without falling off | 3H | Level 0 | 105 |
| Comparative example 2 | 70 | Obvious whiting and falling off | 2H | Level 1 | 100 |
| Comparative example 3 | 50 | Obvious whitish and no shedding | 2H | Level 0 | 110 |
| Comparative example 4 | 40 | Obvious whitish and no shedding | 2H | Level 1 | 95 |
The test results of the examples 1-3 in the table 2 show that the water-based gloss oil for metals provided by the invention can be well coated on the aluminum material, and has good hardness and solvent resistance, and excellent high-temperature boiling resistance and wear resistance.
It is understood from comparative example 1 and comparative examples 1 and 2 that the absence of the liquid petroleum resin or the use of the liquid petroleum resin in an amount outside the range defined in the present invention leads to significant deterioration of the high-temperature cooking resistance and the abrasion resistance.
As can be seen from comparative example 1 and comparative examples 3 and 4, if the blocked isocyanate is absent or used in an amount outside the range defined in the present invention, significant deterioration of the retort resistance and the abrasion resistance is caused.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (14)
1. The water-based gloss oil for metals is characterized by comprising the following components in parts by mass:
40-60 parts of polyester modified waterborne acrylic resin, 5-20 parts of liquid petroleum resin, 5-15 parts of amino resin, 2-8 parts of closed isocyanate, 0.1-0.5 part of organic acid catalyst, 5-15 parts of cosolvent and 10-20 parts of water;
the polyester modified waterborne acrylic resin adopts polyester modified waterborne acrylic resin containing benzene rings and ring structures;
the mass ratio of the polyester modified waterborne acrylic resin to the liquid petroleum resin to the amino resin to the blocked isocyanate is 45-55: 8-15: 5-10: 3 to 5.
2. The aqueous gloss oil for metal of claim 1, wherein the polyester modified aqueous acrylic resin is obtained by polymerizing a polymerization monomer comprising an unsaturated polyester, an acrylate monomer, a hydroxyl group-containing acrylate monomer and a carboxyl group-containing acrylate monomer.
3. The aqueous gloss oil for metals according to claim 2, wherein the unsaturated polyester has a cyclic structure, a solid content of 70%, a glass transition temperature of-20 ℃ to 20 ℃, an acid value of 15 to 35mg KOH/g, and an unsaturation degree of 10 to 15; the acrylate monomer is selected from at least two of styrene, methyl (meth) acrylate and butyl (meth) acrylate; the hydroxyl-containing acrylate monomer is hydroxyethyl (meth) acrylate; the carboxyl-containing acrylate monomer is (methyl) acrylic acid.
4. The aqueous gloss oil for metals of claim 1, wherein the liquid petroleum resin is a C9/C10 unsaturated aromatic hydrocarbon polymer.
5. The aqueous gloss oil for metals according to claim 4, wherein the liquid petroleum resin is selected from one or more of NOVARES TD90, TD90D, TD100 and TD 100D.
6. The aqueous gloss oil for metals according to claim 1, wherein the amino resin is selected from one or more of Resimene 717, Resimene 747, CYMEL 303, CYMEL 350 and OS 303-98 amino resins.
7. The aqueous gloss oil for metals according to claim 1, wherein the blocked isocyanate is selected from one or more of Takenate WB-3021, vestatat B1358/100, Rhodocoat WT1000, Bayhydrol BL 5140 and Bayhydrol D155.
8. The aqueous gloss oil for metals of claim 1, wherein the organic acid catalyst is selected from one or more of the group consisting of Powderlink MTSI, AD3325 DNNDSA, NACURE 155DNNDSA, AD3315DNNSA, and AD3302W p-TSA.
9. The aqueous gloss oil for metals of claim 1, wherein the co-solvent is selected from one or more of isopropanol, n-butanol, isobutanol, ethylene glycol monobutyl ether, and diethylene glycol monobutyl ether.
10. The aqueous gloss oil for metals according to claim 1, further comprising 0.1 to 0.5 parts by mass of an antifoaming agent.
11. The aqueous gloss oil for metals according to claim 1, further comprising 0.1 to 0.5 parts by mass of a leveling agent.
12. The aqueous gloss oil for metals according to claim 1, further comprising 0.5 to 2 parts by mass of a polyfluorinated wax.
13. The method for preparing the aqueous gloss oil for metals according to any one of claims 1 to 12, characterized by comprising the steps of:
feeding: sequentially adding the polyester modified waterborne acrylic resin, part of cosolvent, liquid petroleum resin, amino resin, blocked isocyanate and organic acid catalyst into part of water under stirring, and uniformly stirring;
adjusting the viscosity: sampling to test the viscosity, adding the rest water and the rest cosolvent, and adjusting the viscosity to 90 +/-10 s;
obtaining the water-based varnish for metals.
14. The method for preparing the water base gloss oil for metal according to claim 13, wherein the stirring speed is 600 to 800 r/min.
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