CN115873505A - Water-based environment-friendly coating and preparation method thereof - Google Patents
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Abstract
The invention provides a water-based environment-friendly coating and a preparation method thereof, and relates to the technical field of coatings, wherein the water-based coating comprises the following components: epoxy modified acrylic resin, amino resin, pigment filler, auxiliary agent, modified auxiliary agent, wax powder and water; the water-based paint disclosed by the invention takes water as a solvent, uses a low-odor modification auxiliary agent, firstly performs epoxy modification on acrylic resin, and then performs crosslinking curing with amino resin, so that the crosslinking density of the resin is improved, the modified epoxy acrylic resin has better dispersibility and stability, and the scratch resistance and the salt spray resistance are further improved; wax powder of a suitable composition is added to further improve the scratch resistance of the paint.
Description
Technical Field
The invention belongs to the technical field of coatings, and particularly relates to a water-based environment-friendly coating and a preparation method thereof.
Background
The coating is a solid continuous film obtained by coating, and has the purposes of protection, insulation, decoration and the like. The properties and selection of the coating are critical to the coating. At present, the selection and application of the industrial coating are mainly solvent-based coatings, for example, air-drying oil-based coatings such as alkyd polyurethane, phenolic polyurethane or modified urethane oil are adopted. During the use of these oily products, due to the emission of high content of VOC (volatile organic compounds), not only the odor is large, but also serious environmental pollution and human health problems are easily caused. With the increasing awareness of environmental protection and health, higher and higher requirements are also put forward on the use selection of each component and organic solvent in the coating formula. To reduce the environmental and health hazards of organic solvents, researchers have focused on waterborne coatings.
The water-based paint takes water as a solvent, has the characteristic of environmental protection, and can solve the problems of high VOC content and harm to the environment and human bodies of the traditional oil-based paint. Among them, the water-based acrylic resin paint is one of the main products of acrylic paints. The water-based acrylic paint is prepared by using water as a solvent and water-dispersed acrylic resin. The water-based acrylic resin has low price, good environmental protection and high safety.
The Chinese invention patent CN101649146B discloses a water-based acrylic amino resin primer and a preparation method thereof, wherein the primer comprises the following components: the coating comprises 50% of aqueous acrylic resin solution, amino resin, aqueous acrylic resin white slurry, filler, an aqueous defoaming agent, an aqueous leveling agent, an aqueous adhesion promoter, an amine neutralizer and water. The use of organic solvents in the coating industry is not reduced by the absence of added organic solvents. However, the requirements of the use of the water-based paint on the construction environment are severe, and due to the properties of the components of the water-based paint, the wear resistance, salt spray resistance, scratch resistance and heat resistance of the water-based paint are not good, and improvement is still needed. At present, a great deal of reports are available on the modification of water-based acrylic resin and the research on the improvement of the performance of the coating, and the currently effective modification of acrylic resin can be mainly divided into two types: introducing a functional monomer into an acrylic resin structure; (2) The acrylic resin is subjected to common mixing modification by other resin materials, such as epoxy resin modification, polyurethane modification, amino resin modification grafting and the like.
In the modification of the epoxy resin, because two groups, namely aliphatic hydroxyl and ether bond, in the epoxy resin are not easy to hydrolyze, and flexible hydroxyl and rigid phenyl in the bisphenol A type epoxy resin are arranged in a crossed manner, the epoxy resin has good corrosion resistance. For example, the chinese invention patent CN107163256B discloses an epoxy modified water-based acrylic resin and a water-based vacuum coating primer prepared therefrom; the acrylic resin is modified by reacting an acrylic resin A containing ethylene urea pendant groups with an epoxy resin B to graft the epoxy resin onto the acrylic resin. Then the epoxy modified water-based acrylic resin is compounded with water-based amino resin, water-based blocked isocyanate, baking varnish modifier and the like, and the obtained water-based vacuum coating primer can be quickly dried by fingers (for 3-5 min) at 100 ℃, can be quickly cured to form a film, and has high hardness, water resistance and good salt fog resistance. Wherein, the salt spray resistance can be more than 24 hours after being detected by 5 percent NaCl. Therefore, the epoxy modification of the acrylic resin can improve the performances of durability and the like of the coating.
However, in practical applications, some challenges still face, such as poor scratch resistance, still improved salt spray resistance, and the like, and the application range is limited. Therefore, the performance of the coating is improved by starting from the aspect of modification of the acrylic resin and strictly controlling the proportion of the modified resin mixed with the acrylic resin, so that the cured coating achieves higher crosslinking density, and the performance of the coating is improved.
The paint is prepared from acrylic resin, combined epoxy resin and amino resin, pigment, auxiliary agent, modified auxiliary agent, wax powder and the like, and water is used as a solvent; the acrylic resin is grafted with the epoxy group, so that the resin has high weather resistance of the acrylic resin and strong adhesiveness of the epoxy resin, is crosslinked and cured with the amino resin, improves the crosslinking density, improves the scratch resistance and the salt spray resistance, improves various performances of a coating film, and reduces the use of organic solvents in the coating industry.
Disclosure of Invention
The invention provides a water-based environment-friendly coating and a preparation method thereof aiming at the problems in the prior art, wherein the water-based coating comprises epoxy modified acrylic resin, amino resin, pigment and filler, an auxiliary agent, a modification auxiliary agent and wax powder, and water is used as a solvent; firstly, carrying out epoxy modification on acrylic resin, and then crosslinking and curing the acrylic resin and amino resin to improve the crosslinking density of the resin, thereby improving the scratch resistance and the salt spray resistance; the addition of wax powder of a suitable composition further improves scratch resistance.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
on one hand, the invention provides a water-based environment-friendly coating which comprises the following components in parts by weight: 30-60 parts of epoxy modified acrylic resin, 6-15 parts of amino resin, 1-5 parts of pigment and filler, 1-15 parts of auxiliary agent, 5-15 parts of wax powder and 20-30 parts of water.
Preferably, the coating comprises the following components in parts by weight: 35-50 parts of epoxy modified acrylic resin, 8-12 parts of amino resin, 2-3 parts of pigment and filler, 5-10 parts of auxiliary agent, 8-12 parts of wax powder and 23-28 parts of water.
Preferably, the epoxy modified acrylic resin comprises the following components in parts by weight: 35-60 parts of epoxy resin, 3-10 parts of modification auxiliary agent, 10-15 parts of n-butyl alcohol, 1-3 parts of initiator, 40-60 parts of acrylic resin and 1-10 parts of amine.
Preferably, the epoxy resin is bisphenol A epoxy resin and is selected from at least one of E03, E51 and E20.
Further preferably, when the epoxy resin is a mixture of two resins E03 and E51, the weight ratio is 4-5:6-5.
Preferably, the modification auxiliary agent is selected from at least one of dipropylene glycol monobutyl ether (DPNB), dipropylene glycol methyl ether (DPM), ethylene glycol monobutyl ether (BCS), diethylene glycol monobutyl ether (DGBE).
Preferably, the initiator is selected from at least one of dibenzoyl peroxide (BPO), azobisisobutyronitrile (AIBO), di-t-butyl peroxide (DTBP), tert-butyl peroxybenzoate (TBPB).
Preferably, the amine is selected from at least one of N, N-Dimethylethanolamine (DMEA), polyamide, polyimide, dimethylethanolamine.
Preferably, the preparation method of the epoxy modified acrylic resin comprises the following steps:
(1) Uniformly mixing epoxy resin, a modification auxiliary agent and n-butanol in parts by weight, heating to 100-130 ℃, and uniformly stirring to obtain a mixture A;
(2) Uniformly mixing 1/4-1/2 of initiator and acrylic resin, heating to 100-130 ℃, and preserving heat for 30-60min to obtain a mixture B;
(3) Uniformly mixing the rest part by weight of initiator and the mixture B at the constant temperature, dripping the mixture into the mixture A within 1h, and reacting at the constant temperature for 0.5-4h;
(4) And cooling to 40-80 ℃, adding amine for neutralization reaction for 1-3h, removing unreacted solvent and resin, and adding water for sufficient dispersion to obtain the waterborne epoxy modified acrylic resin.
Further preferably, the preparation method of the epoxy modified acrylic resin comprises the following steps:
(1) Uniformly mixing epoxy resin, a modification auxiliary agent and n-butyl alcohol in parts by weight, heating to 120 ℃, and uniformly stirring to obtain a mixture A;
(2) Uniformly mixing 1/3 of initiator by weight with acrylic resin, heating to 120 ℃, and preserving heat for 50min to obtain a mixture B;
(3) Uniformly mixing the rest part by weight of initiator and the mixture B at 120 ℃ under the condition of heat preservation, dripping the mixture B into the mixture A within 1h, and reacting for 3h under the condition of heat preservation;
(4) And (3) cooling to 60 ℃, adding amine to perform neutralization reaction for 1.5h, and removing unreacted solvent and resin to obtain the epoxy modified acrylic resin.
Preferably, the weight part ratio of the amino resin to the epoxy modified acrylic resin is 0.5-3.
Preferably, the pigment and filler is an inorganic filler selected from at least one of barium sulfate, mica powder, kaolin, zinc phosphate, zinc oxide, barium phosphate and titanium dioxide.
Preferably, the auxiliary agent comprises the following components in parts by weight: 0.5-3 parts of dispersing agent, 0.5-3 parts of defoaming agent, 0.5-3 parts of wetting agent and 0.5-3 parts of flatting agent.
Further preferably, the dispersant is at least one selected from the group consisting of polyol-polyethyleneimine block copolymers, polyethylene glycol type polyols, polyacrylates, polydimethylsiloxane and ethylene-vinyl acetate copolymers.
Further preferably, the defoaming agent is a defoaming agent containing an organosiloxane type.
Further preferably, the wetting agent is a silicone adjuvant.
Further preferably, the leveling agent is at least one selected from the group consisting of a polyorganosiloxane polymer and a polyacrylic leveling agent.
Preferably, the wax powder is selected from at least one of polyethylene wax powder, oxidized polyethylene wax powder and polyamide wax powder.
On the other hand, the invention provides a preparation method of the water-based environment-friendly paint, which comprises the following steps:
(1) Dispersing epoxy modified acrylic resin: uniformly mixing epoxy acrylic resin and water, and stirring and dispersing for 30-60min at a speed of 100-500r/min until the epoxy acrylic resin and the water are completely dispersed to obtain a mixture 1;
(2) Uniformly mixing the mixture 1 with a dispersant, a defoaming agent and pigment and filler, stirring and dispersing for 10-20min at a speed of 600-1000r/min, and grinding to a fineness of 0.1-20 mu m to obtain a mixture 2;
(3) And mixing the mixture 2 with amino resin, a wetting agent, a flatting agent and wax powder, and stirring for 20-60min at 30-60 ℃ to obtain the coating.
Preferably, the preparation method of the water-based environment-friendly coating comprises the following steps:
(1) Dispersing epoxy modified acrylic resin: uniformly mixing epoxy acrylic resin and water, and stirring and dispersing for 40-50min at a speed of 200-300r/min until the epoxy acrylic resin and the water are completely dispersed to obtain a mixture 1;
(2) Uniformly mixing the mixture 1 with a dispersing agent, a defoaming agent and pigment and filler, stirring and dispersing for 15min at the speed of 800r/min, and grinding to the fineness of 1-10 mu m to obtain a mixture 2;
(3) And mixing the mixture 2 with amino resin, a wetting agent, a flatting agent and wax powder, and stirring at the temperature of 40 ℃ for 30min at the speed of 200-300r/min to obtain the coating.
Further preferably, after the coating is obtained, spraying plate color adjustment and viscosity adjustment can be carried out on the coating to obtain the coating with different color and viscosity requirements, so that the requirements of more consumers are met.
Compared with the prior art, the invention has the following beneficial effects:
1. in the modified epoxy acrylic resin system, the addition of a specific initiator and a modification auxiliary agent can reduce the use of a solvent; meanwhile, the dispersity and the stability of the system are improved, so that the modified resin is easier to crosslink and solidify with amino resin, the crosslinking degree is improved, and the salt spray resistance and the scratch resistance are further improved.
2. According to the invention, the epoxy group is grafted on the acrylic resin under specific conditions, so that the high weather resistance of the acrylic resin is improved, and the prepared modified epoxy acrylic resin has strong adhesive force and the salt spray resistance of the coating is improved.
3. Wax powder is added into the paint, and the wax powder and resin further act to realize synergistic interaction, so that the scratch resistance of the product paint is obviously improved.
4. The water-based paint disclosed by the invention uses the low-odor modification auxiliary agent, so that the modified epoxy acrylic resin has better dispersibility and stability and low VOC (volatile organic compound) emission.
Detailed Description
The following non-limiting examples are presented to enable those of ordinary skill in the art to more fully understand the present invention and are not intended to limit the invention in any way. The following is merely an exemplary illustration of the scope of the claims of the present application and various changes and modifications of the invention of the present application may be made by those skilled in the art based on the disclosure, which should also fall within the scope of the claims of the present application.
The present invention will be further described below by way of specific examples. The various chemicals used in the examples of the present invention were obtained by conventional commercial routes unless otherwise specified.
In the embodiment of the invention, the epoxy resin is E03 and E51 which are respectively purchased from Kaigonian Guangzhou chemical industry (brand south Asia, commodity number 00258) and Wanqian chemical industry; the dispersant was purchased from 190 bib, germany; the antifoaming agent was purchased from BYK-011 from Bike, germany; wetting agents were purchased from BYK wetting agent, germany, BYK-347; the leveling agent is purchased from BYK-302 of Bick, germany; the wax powder is polyethylene wax S394; the amino resin is melamine resin.
Examples 1 to 4
The water-based environment-friendly coating of the embodiments 1 to 4 comprises the following components in parts by weight:
TABLE 1
| Example 1 | Example 2 | Example 3 | Example 4 | |
| Epoxy modified acrylic resin | 45 | 30 | 60 | 60 |
| Amino resin | 10 | 6 | 15 | 10 |
| Barium sulfate | 1 | 1 | 2 | 1 |
| Zinc phosphate | 1 | 1 | 2 | 1 |
| Dispersant 190 | 2 | 1 | 2.5 | 2.5 |
| Defoaming agent BYK-011 | 2 | 1 | 2.5 | 2.5 |
| Wetting agent BYK-347 | 2 | 1 | 2.5 | 2.5 |
| Leveling agent BYK-302 | 2 | 1 | 2.5 | 2.5 |
| Polyethylene wax S394 | 10 | 5 | 15 | 15 |
| Water (W) | 25 | 20 | 30 | 30 |
In examples 1 to 4, the epoxy-modified acrylic resin comprises the following components in parts by weight: 15 parts of epoxy resin E03, 25 parts of epoxy resin E51, 6 parts of modified auxiliary dipropylene glycol monobutyl ether (DPNB), 12 parts of N-butanol, 2 parts of initiator dibenzoyl peroxide (BPO), 50 parts of acrylic resin and 5 parts of N, N-Dimethylethanolamine (DMEA).
In examples 1 to 4, the method for preparing the epoxy-modified acrylic resin includes the steps of:
(1) Uniformly mixing epoxy resin, a modification auxiliary agent and n-butyl alcohol in parts by weight, heating to 120 ℃, and uniformly stirring to obtain a mixture A;
(2) Uniformly mixing 1/3 of initiator and acrylic resin, heating to 120 ℃, and keeping the temperature for 50min to obtain a mixture B;
(3) Uniformly mixing the rest part by weight of initiator and the mixture B at 120 ℃ under the condition of heat preservation, dripping the mixture B into the mixture A within 1h, and reacting for 3h under the condition of heat preservation;
(4) And cooling to 60 ℃, adding amine to neutralize and react for 1.5h, and removing unreacted solvent and resin to obtain the epoxy modified acrylic resin.
In examples 1 to 4, the method for preparing the aqueous environment-friendly coating comprises the following steps:
(1) Dispersing epoxy modified acrylic resin: uniformly mixing epoxy acrylic resin and water, and stirring and dispersing for 45min at a speed of 200-300r/min until the epoxy acrylic resin and the water are completely dispersed to obtain a mixture 1;
(2) Uniformly mixing the mixture 1 with a dispersing agent, a defoaming agent and a pigment filler, stirring and dispersing for 15min at the speed of 800r/min, and grinding until the fineness is less than 20 mu m to obtain a mixture 2;
(3) And mixing the mixture 2 with amino resin, a wetting agent, a flatting agent and wax powder, and stirring for 30min at the temperature of 40 ℃ at 200-300r/min to obtain the water-based environment-friendly coating.
Example 5
Unlike example 1, in the epoxy-modified acrylic resin, the initiator was replaced with Azobisisobutyronitrile (AIBO), unlike the initiator. The remaining parameters and steps are the same.
Example 6
Unlike example 1, the epoxy-modified acrylic resin was modified with dipropylene glycol methyl ether (DPM) instead of the modifying aid. The remaining parameters and steps are the same.
Example 7
Unlike example 1, in the epoxy-modified acrylic resin, amine was replaced with polyamide. The remaining parameters and steps are the same.
Example 8
Unlike example 1, the epoxy-modified acrylic resin was prepared by a method comprising the steps of:
(1) Uniformly mixing the epoxy resin, the modification auxiliary agent and the n-butyl alcohol in parts by weight, heating to 105 ℃, and uniformly stirring to obtain a mixture A;
(2) Uniformly mixing 1/3 of initiator by weight with acrylic resin, heating to 105 ℃, and preserving heat for 30min to obtain a mixture B;
(3) Uniformly mixing the rest part by weight of initiator and the mixture B at 105 ℃ under the condition of heat preservation, dripping the mixture B into the mixture A within 1h, and reacting for 2h under the condition of heat preservation;
(4) And cooling to 50 ℃, adding amine for neutralization reaction for 3h, and removing unreacted solvent and resin to obtain the epoxy modified acrylic resin.
Comparative examples 1 to 3
Comparative examples 1-3 differ from example 1 in the parts by weight of the coating components, as shown in table 2:
TABLE 2
| Comparative example 1 | Comparative example 2 | Comparative example 3 | |
| Epoxy modified acrylic resin | 45 | 45 | 45 |
| Amino resin | 20 | 10 | 10 |
| Barium sulfate | 1 | 1 | 1 |
| Zinc phosphate | 1 | 1 | 1 |
| Dispersant 190 | 2 | - | 2 |
| Defoaming agent BYK-011 | 2 | 2 | 2 |
| Wetting agent BYK-347 | 2 | 2 | 2 |
| Leveling agent BYK-302 | 2 | - | 2 |
| Polyethylene wax S394 | 10 | 10 | Replacement with paraffin 10 |
| Water (W) | 25 | 25 | 25 |
Comparative example 4
Different from the embodiment 1, in the epoxy modified acrylic resin, the parts of the initiator are different, and the part of the initiator is 0.5. The remaining parameters and steps are the same.
Comparative example 5
Different from the embodiment 1, the epoxy modified acrylic resin has different parts of the modifying assistant, and the part of the modifying assistant is 2 parts. The remaining parameters and steps are the same.
Comparative example 6
Different from the embodiment 1, in the epoxy modified acrylic resin, the type of the modification auxiliary agent is different, the modification auxiliary agent is replaced by a mixture of ethylene glycol monobutyl ether and methyl glycol methyl ether, and the mass ratio is 1:1. The remaining parameters and steps are the same.
Comparative example 7
Unlike example 1, the epoxy-modified acrylic resin used was different in the amount of amine used, and the amount of amine used was 1% of that of the epoxy resin, that is, 0.4 part. The remaining parameters and steps are the same.
Comparative example 8
Different from the example 1, in the epoxy modified acrylic resin, the epoxy resin is E51, and the part is 25 parts. The remaining parameters and steps are the same.
Comparative example 9
Different from the embodiment 1, the preparation method of the epoxy modified acrylic resin comprises the following steps:
(1) Uniformly mixing the epoxy resin, the modification auxiliary agent and the n-butyl alcohol in parts by weight, heating to 150 ℃, and uniformly stirring to obtain a mixture A;
(2) Uniformly mixing 1/3 of initiator by weight with acrylic resin, heating to 150 ℃, and preserving heat for 30min to obtain a mixture B;
(3) Uniformly mixing the rest part by weight of initiator and the mixture B at the temperature of 150 ℃, dropwise adding the mixture B into the mixture A within 1h, and reacting for 1h under the condition of heat preservation;
(4) And cooling to 60 ℃, adding amine for neutralization reaction for 3h, and removing unreacted solvent and resin to obtain the epoxy modified acrylic resin.
Comparative example 10
Different from the embodiment 1, the preparation method of the water-based environment-friendly paint comprises the following steps:
(1) Dispersing epoxy modified acrylic resin: uniformly mixing epoxy acrylic resin and water, and stirring and dispersing for 45min at the speed of 200-300r/min until the epoxy acrylic resin and the water are completely dispersed to obtain a mixture 1;
(2) Uniformly mixing the mixture 1 with a dispersing agent, a defoaming agent and a pigment and filler, and stirring and dispersing at 800r/min for 15min to obtain a mixture 2;
(3) And mixing the mixture 2 with amino resin, a wetting agent, a flatting agent and wax powder, and stirring for 30min at the temperature of 40 ℃ at 200-300r/min to obtain the water-based environment-friendly coating.
Test 1 neutral salt spray resistance test
Tests the coatings prepared in examples 1-8 and comparative examples 1-10 were tested for their neutral salt spray resistance according to GB/T13452.4-2008. The base material is a sand-blasting cold-rolled sheet, the spraying pressure is 1kg, the salt spray recovery amount is 1-2.5mL/h, the test sheet is sprayed for construction, and the edge of the test sheet is sealed by epoxy sealing. It was placed in a salt spray box. The temperature of the salt spray box is 35 +/-2 ℃, and 5wt% of NaCl solution is sprayed. The results are shown in Table 3.
Test 2 hardness test
The scratch resistance of the paint spraying film is detected according to the GB/T6739-2006 specification, the scratch of the paint film is taken as a detection reference, the base material is a tinplate, and the pencil is a Chinese pencil. The results are shown in Table 3.
Test 3 adhesion test
The coatings of the above examples and comparative examples were uniformly sprayed on an aluminum plate using a conventional coating spray process to prepare a coating layer having a target dry film weight of 12g/m 2 And baking in an oven at 150 ℃ for 60s until complete curing is achieved, wherein the thickness of the coating is less than 250mm. Grading is carried out by adopting a GB/T9286-1998 standard method (gridding method). The adhesive force is divided into 6 grades (0 grade, 1 grade, 2 grade, 3 grade, 4 grade and 5 grade), the adhesive force of the coating is gradually reduced from 0 grade to 5 grade, and the adhesive force of 5 grade is the worst.
Test 4 Corrosion resistance test
The coatings of the above examples and comparative examples were uniformly sprayed on an aluminum plate using a conventional coating spray process to prepare a coating layer having a target dry film weight of 12g/m 2 And baking in an oven at 150 ℃ for 60s until complete curing is achieved. Soaking the coating sample in 2% citric acid water solution at 120 deg.C for 90min, and obtaining qualified product without foaming, whitening, water spotting, discoloration, fading, and cooking displacement; otherwise, the product is not qualified. The results are shown in Table 3.
TABLE 3
Finally, it should be noted that the above-mentioned contents are only used for illustrating the technical solutions of the present invention, and not for limiting the protection scope of the present invention, and that the simple modifications or equivalent substitutions of the technical solutions of the present invention by those of ordinary skill in the art can be made without departing from the spirit and scope of the technical solutions of the present invention.
Claims (10)
1. The water-based environment-friendly coating is characterized by comprising the following components in parts by weight: 30-60 parts of epoxy modified acrylic resin, 6-15 parts of amino resin, 1-5 parts of pigment and filler, 1-15 parts of auxiliary agent, 5-15 parts of wax powder and 20-30 parts of water.
2. The paint as claimed in claim 1, which is characterized by comprising the following components in parts by weight: 35-50 parts of epoxy modified acrylic resin, 8-12 parts of amino resin, 2-3 parts of pigment and filler, 5-10 parts of auxiliary agent, 8-12 parts of wax powder and 23-28 parts of water.
3. The coating according to any one of claims 1-2, wherein the epoxy modified acrylic resin comprises the following components in parts by weight: 35-60 parts of epoxy resin, 3-10 parts of modification auxiliary agent, 10-15 parts of n-butyl alcohol, 1-3 parts of initiator, 40-60 parts of acrylic resin and 1-10 parts of amine.
4. The paint according to claim 3, wherein in the epoxy modified acrylic resin, the epoxy resin is bisphenol A type epoxy resin; the modifying auxiliary agent is at least one selected from dipropylene glycol monobutyl ether, dipropylene glycol methyl ether, ethylene glycol monobutyl ether and diethylene glycol monobutyl ether; the initiator is selected from at least one of dibenzoyl peroxide, azobisisobutyronitrile, di-tert-butyl peroxide and tert-butyl peroxybenzoate; the amine is selected from at least one of N, N-dimethylethanolamine, polyamide, polyimide and dimethylethanolamine.
5. A method for preparing an epoxy-modified acrylic resin in a coating according to any one of claims 1 to 4, comprising the steps of:
(1) Uniformly mixing epoxy resin, a modification auxiliary agent and n-butanol in parts by weight, heating to 100-130 ℃, and uniformly stirring to obtain a mixture A;
(2) Uniformly mixing 1/4-1/2 of initiator and acrylic resin, heating to 100-130 ℃, and preserving heat for 30-60min to obtain a mixture B;
(3) Uniformly mixing the rest part by weight of initiator and the mixture B at the constant temperature, dripping the mixture into the mixture A within 1h, and reacting at the constant temperature for 0.5-4h;
(4) And cooling to 40-80 ℃, adding amine for neutralization reaction for 1-3h, removing unreacted solvent and resin, and adding water for dispersion to obtain the waterborne epoxy modified acrylic resin.
6. The coating according to claim 1, wherein the weight ratio of the amino resin to the epoxy modified acrylic resin is 0.5-3.
7. The paint of claim 1, wherein the pigment and filler is an inorganic filler selected from at least one of barium sulfate, mica powder, kaolin, zinc phosphate, zinc oxide, barium phosphate and titanium dioxide; the wax powder is at least one of polyethylene wax powder, oxidized polyethylene wax powder and polyamide wax powder.
8. The coating of claim 1, wherein the adjuvant comprises, in parts by weight: 0.5-3 parts of dispersing agent, 0.5-3 parts of defoaming agent, 0.5-3 parts of wetting agent and 0.5-3 parts of flatting agent.
9. The coating of claim 8, wherein the dispersant is selected from at least one of a polyol polyethylenimine block copolymer, a polyethylene glycol polyol, a polyacrylate, a polydimethylsiloxane, and an ethylene-vinyl acetate copolymer; the defoaming agent is an organic siloxane type defoaming agent; the wetting agent is a polysiloxane auxiliary agent; the leveling agent is at least one selected from polyorganosiloxane polymer and polyacrylic leveling agent.
10. A method of preparing a coating according to any one of claims 1 to 4, 6 to 9, comprising the steps of:
(1) Dispersing epoxy modified acrylic resin: uniformly mixing epoxy acrylic resin and water, and stirring and dispersing for 30-60min at a speed of 100-500r/min until the epoxy acrylic resin and the water are completely dispersed to obtain a mixture 1;
(2) Uniformly mixing the mixture 1 with a dispersant, a defoaming agent and pigment and filler, stirring and dispersing for 10-20min at a speed of 600-1000r/min, and grinding to a fineness of 0.1-20 mu m to obtain a mixture 2;
(3) And mixing the mixture 2 with amino resin, a wetting agent, a flatting agent and wax powder, and stirring for 20-60min at 30-60 ℃ to obtain the coating.
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| CN116515358A (en) * | 2023-04-28 | 2023-08-01 | 深圳市深赛尔股份有限公司 | Preparation method of modified aqueous aluminum rolling paint and aqueous aluminum rolling-aqueous printing paint |
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| CN103146278A (en) * | 2013-03-25 | 2013-06-12 | 扬州大学 | Preparation method of low-temperature curing water-based acrylic amino baking coating |
| CN107236418A (en) * | 2017-07-17 | 2017-10-10 | 江苏三木化工股份有限公司 | The preparation method of the water-based acrylic resin of epoxy resin modification |
| CN109233573A (en) * | 2018-07-25 | 2019-01-18 | 河北晨阳工贸集团有限公司 | A kind of tubbing water soluble acrylic acid amino-stoving varnish and preparation method thereof |
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| CN109666380A (en) * | 2018-12-26 | 2019-04-23 | 南京长江涂料有限公司 | A kind of aluminium aqueous amino sand streak baking vanish and preparation method thereof |
| CN110128889A (en) * | 2019-06-03 | 2019-08-16 | 兰州陇嘉化工科技有限公司 | Waterborne epoxy modified acrylic resin and its preparation method and application |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116515358A (en) * | 2023-04-28 | 2023-08-01 | 深圳市深赛尔股份有限公司 | Preparation method of modified aqueous aluminum rolling paint and aqueous aluminum rolling-aqueous printing paint |
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