Quick-drying antirust water-based alkyd paint and preparation method thereof

Abstract

The invention discloses quick-drying anti-rust water-based alkyd paint and a preparation method of the quick-drying anti-rust water-based alkyd paint, and belongs to the technical field of water-based alkyd paint. Comprising the following raw materials in parts by mass: 25-50 parts of waterborne alkyd resin, 15-30 parts of an acrylic emulsion, 10-15 parts of an anti-rust pigment, 14-20 parts of a filler, 3-5 parts of nano silicon dioxide, 4-6 parts of a cosolvent, 0.2-1 part of a pH regulator, 0.5-1 part of a wetting dispersant, 0.2-0.5 part of a defoaming agent, 0.3-1 part of a corrosion inhibitor and the balance of deionized water. The water-based alkyd paint solves the problem that the existing water-based alkyd paint is low in drying speed and poor in anti-rust performance during use, so that the use effect of the water-based alkyd paint is poor. The prepared water-based alkyd paint is high in drying speed and good in anti-rust performance, and the using effect of the water-based alkyd paint can be improved.

Description

Technical Field

[0001] The invention relates to the technical field of water-based alkyd paints, in particular to a quick-drying rust-proof water-based alkyd paint and a preparation method thereof. Background Art

[0002] Water-based alkyd paint is a series of primers made with water-based alkyd resin and acrylic emulsion as base materials, with the addition of pigments, fillers and other additives. It is often used on surface-treated metals.

[0003] Chinese patent application publication number CN114686080A discloses an alkyd paint and its preparation method. The alkyd paint comprises the following components by weight: 50-80 parts of a modified alkyd resin; 30-50 parts of a polyurethane emulsion; 5-8 parts of a pigment or filler; and 2-3 parts of a drier. The modified alkyd resin is prepared by blending and modifying an alkyd resin with emulsified asphalt, an acrylic emulsion, and a nano-metal filler. The modification of the alkyd resin significantly increases the curing rate of the paint while also ensuring the service life of the paint, making the cured film less susceptible to shedding. However, this patent has the following drawbacks:

[0004] Existing water-based alkyd paints have a slow drying speed and poor anti-rust performance during use, resulting in poor use effects of the water-based alkyd paints. Summary of the Invention

[0005] The purpose of the present invention is to provide a quick-drying anti-rust water-based alkyd paint and a preparation method thereof, which has a fast drying speed and good anti-rust performance, can improve the use effect of the water-based alkyd paint, and solve the problems raised in the above-mentioned background technology.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] A quick-drying anti-rust water-based alkyd paint comprises the following raw materials in parts by weight:

[0008] 25-50 parts of water-based alkyd resin, 15-30 parts of acrylic emulsion, 10-15 parts of anti-rust pigment, 14-20 parts of filler, 3-5 parts of nano-silica, 4-6 parts of cosolvent, 0.2-1 part of pH regulator, 0.5-1 part of wetting and dispersing agent, 0.2-0.5 part of defoamer, 0.3-1 part of corrosion inhibitor and the balance of deionized water.

[0009] Preferably, the solid content of the acrylic emulsion is 45-55%.

[0010] Preferably, the anti-rust pigment is zinc phosphate.

[0011] Preferably, the filler is mica powder.

[0012] Preferably, the cosolvent is propylene glycol methyl ether.

[0013] Preferably, the pH regulator is one of ammonia water, NaOH, and dimethylethanolamine.

[0014] Preferably, the corrosion inhibitor is benzotriazole.

[0015] According to another aspect of the present invention, there is provided a method for preparing the above-mentioned quick-drying anti-rust water-based alkyd paint, comprising the following steps:

[0016] Add deionized water, wetting dispersant and defoaming agent into the stirring tank and stir at low speed for 5 minutes at a rate of 300-500 r / min;

[0017] Add anti-rust pigment, filler and nano-silica into the stirring kettle, and high-speed shear for 20-30 minutes until the fineness is ≤25μm, and the high-speed stirring rate is 1500-2000r / min;

[0018] Reduce the high-speed stirring rate to 500r / min, and slowly add water-based alkyd resin and acrylic emulsion into the stirring tank, add cosolvent and corrosion inhibitor, and stir for 15 minutes until uniform;

[0019] A pH regulator was added to the stirred tank to adjust the pH value of the coating, and the coating was filtered through a 200-mesh sieve to remove impurities and sealed and packaged to prepare a water-based alkyd paint.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] The invention comprises the following steps: adding deionized water, a wetting dispersant and a defoaming agent into a stirring kettle, stirring and mixing at a low speed for 5 minutes, adding an anti-rust pigment, a filler and nano-silica into the stirring kettle, shearing at a high speed for 20-30 minutes until a fineness is less than or equal to 25 μm, reducing the high-speed stirring rate to 500 r / min, slowly adding a water-based alkyd resin and an acrylic emulsion into the stirring kettle, adding a cosolvent and a corrosion inhibitor, stirring for 15 minutes until uniform, adding a pH regulator into the stirring kettle to adjust the pH value of the coating, filtering through a 200-mesh screen to remove impurities, and sealing and packaging to prepare a water-based alkyd paint. The water-based alkyd paint has a fast drying speed and good anti-rust performance, and can improve the use effect of the water-based alkyd paint. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 The present invention is a flow chart for preparing the quick-drying rust-proof water-based alkyd paint. DETAILED DESCRIPTION

[0023] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0024] In order to solve the problem that the existing water-based alkyd paint has a slow drying speed and poor anti-rust performance during use, which leads to poor use effect of water-based alkyd paint, please refer to Figure 1 , this embodiment provides the following technical solutions:

[0025] Example 1

[0026] A quick-drying anti-rust water-based alkyd paint comprises the following raw materials in parts by weight:

[0027] 25 parts of water-based alkyd resin, 15 parts of acrylic emulsion, 15 parts of anti-rust pigment, 14 parts of filler, 3 parts of nano-silica, 4 parts of cosolvent, 0.2 parts of pH regulator, 0.5 parts of wetting and dispersing agent, 0.2 parts of defoaming agent, 1 part of corrosion inhibitor and the balance of deionized water.

[0028] It should be noted that water-based alkyd resin and acrylic emulsion are used as base materials to provide film-forming properties and adhesion; anti-rust pigments are used to passivate the metal surface and inhibit rust; fillers are used to enhance the shielding effect and inhibit rust; nano-silica is used to enhance the hardness of the paint film and accelerate drying; co-solvents are used to improve leveling and promote volatile drying; pH regulators are used to adjust the pH value; wetting and dispersing agents are used to prevent pigment sedimentation and improve stability; defoaming agents are used to reduce construction bubbles; corrosion inhibitors are used for synergistic rust prevention and inhibit electrochemical corrosion; deionized water is used to adjust viscosity and environmentally friendly dilution.

[0029] In this embodiment, the solid content of the acrylic emulsion is 45-55%.

[0030] In this embodiment, the anti-rust pigment is zinc phosphate.

[0031] In this embodiment, the filler is mica powder.

[0032] In this embodiment, the cosolvent is propylene glycol methyl ether.

[0033] In this embodiment, the pH adjuster is one of ammonia water, NaOH, and dimethylethanolamine.

[0034] In this embodiment, the corrosion inhibitor is benzotriazole.

[0035] Specifically, nano-silica forms a porous structure to promote water volatilization, and the co-solvent synergistically increases the evaporation rate, making the water-based alkyd paint dry quickly; zinc phosphate and benzotriazole are used for double passivation to block cathode / anodic corrosion reactions and improve the rust-proof performance of water-based alkyd paint; and water is used as the dispersion medium, which is low in VOC and safe for construction.

[0036] According to another aspect of the present invention, there is provided a method for preparing the above-mentioned quick-drying anti-rust water-based alkyd paint, comprising the following steps:

[0037] Add deionized water, wetting dispersant and defoaming agent into the stirring tank and stir at low speed for 5 minutes at a rate of 300-500 r / min;

[0038] Add anti-rust pigment, filler and nano-silica into the stirring kettle, and high-speed shear for 20-30 minutes until the fineness is ≤25μm, and the high-speed stirring rate is 1500-2000r / min;

[0039] Reduce the high-speed stirring rate to 500r / min, and slowly add water-based alkyd resin and acrylic emulsion into the stirring tank, add cosolvent and corrosion inhibitor, and stir for 15 minutes until uniform;

[0040] A pH regulator was added to the stirred tank to adjust the pH value of the coating, and the coating was filtered through a 200-mesh sieve to remove impurities and sealed and packaged to prepare a water-based alkyd paint.

[0041] Example 2

[0042] The difference from Example 1 is that the mass fractions of the raw materials of the water-based alkyd paint are different;

[0043] In this embodiment, the quick-drying anti-rust water-based alkyd paint includes the following raw materials in parts by weight:

[0044] 30 parts of water-based alkyd resin, 20 parts of acrylic emulsion, 15 parts of anti-rust pigment, 14 parts of filler, 3 parts of nano-silica, 4 parts of cosolvent, 0.4 parts of pH regulator, 0.6 parts of wetting and dispersing agent, 0.3 parts of defoaming agent, 1 part of corrosion inhibitor and the balance of deionized water.

[0045] The water-based alkyd paint was prepared using the same preparation method as in Example 1.

[0046] Example 3

[0047] The difference from Example 1 is that the mass fractions of the raw materials of the water-based alkyd paint are different;

[0048] In this embodiment, the quick-drying anti-rust water-based alkyd paint includes the following raw materials in parts by weight:

[0049] 40 parts of water-based alkyd resin, 25 parts of acrylic emulsion, 15 parts of anti-rust pigment, 16 parts of filler, 4 parts of nano-silica, 5 parts of cosolvent, 0.6 parts of pH regulator, 0.8 parts of wetting and dispersing agent, 0.4 parts of defoamer, 1 part of corrosion inhibitor and the balance of deionized water.

[0050] The water-based alkyd paint was prepared using the same preparation method as in Example 1.

[0051] Example 4

[0052] The difference from Example 1 is that the mass fractions of the raw materials of the water-based alkyd paint are different;

[0053] In this embodiment, the quick-drying anti-rust water-based alkyd paint includes the following raw materials in parts by weight:

[0054] 50 parts of water-based alkyd resin, 30 parts of acrylic emulsion, 15 parts of anti-rust pigment, 20 parts of filler, 5 parts of nano-silica, 6 parts of cosolvent, 1 part of pH regulator, 1 part of wetting and dispersing agent, 0.5 parts of defoamer, 1 part of corrosion inhibitor and the balance of deionized water.

[0055] The water-based alkyd paint was prepared using the same preparation method as in Example 1.

[0056] Comparative Example

[0057] Chinese patent application CN114686080A discloses an alkyd paint and a preparation method thereof. The alkyd paint is composed of the following components in parts by weight: 50-80 parts of modified alkyd resin; 30-50 parts of polyurethane emulsion; 5-8 parts of pigments and fillers; and 2-3 parts of drying agent.

[0058] The preparation method is as follows: modified alkyd resin, polyurethane emulsion, pigment, filler and drying agent are mixed at 2000-2500r / min for 30-45min under nitrogen protection to prepare alkyd paint.

[0059] The water-based alkyd paints prepared according to Examples 1-4 and the comparative example were subjected to performance tests. The quick-drying performance and anti-rust performance test methods of the water-based alkyd paints were as follows:

[0060] 1) Quick-drying performance test (GB / T 1728-2020)

[0061] The drying time of water-based alkyd paint was measured according to the paint film and putty film drying time determination method to evaluate the quick-drying performance of water-based alkyd paint;

[0062] Among them, the surface drying time test method is: gently place a cotton ball on the surface of the paint film, use your mouth to keep 10cm-15cm away from the cotton ball, and blow the cotton ball horizontally. If it can be blown away and no cotton fibers are left on the surface of the paint film, the surface is considered dry.

[0063] Among them, the actual drying time test method is: put a cotton ball on the surface of the paint film, and then gently place the drying time tester on the cotton ball, and start the stopwatch at the same time. After 30 seconds, remove the drying time tester and the cotton ball, and leave it for 5 minutes. If there is no trace of the cotton ball and no loss of gloss on the surface of the paint film; if there are 1-2 cotton threads left on the paint film, but they can be gently brushed off with a cotton ball, the paint film is considered to be actually dry.

[0064] 2) Anti-rust performance test (GB / T 1771-2007)

[0065] The salt spray resistance and chemical resistance of water-based alkyd paint were tested according to the neutral salt spray resistance test method for paints and varnishes to evaluate the anti-rust performance of water-based alkyd paint;

[0066] Among them, the salt spray resistance test method is: according to the salt spray test method, acetic acid-sodium chloride test solution containing copper chloride is sprayed on the paint film in a mist form using a salt spray test machine, and the changes in the surface performance of the paint film are observed after 120 hours.

[0067] Among them, the chemical resistance test method is: immerse the paint film in acid and alkali solution for 48 hours and observe the changes in the surface performance of the paint film.

[0068] Specifically, the performance test results of water-based alkyd paint are shown in Table 1:

[0069] Table 1: Performance test results of water-based alkyd paint

[0070] Surface drying time / min Drying time / h Salt spray resistance Chemical resistance Example 1 30min 3.8h No bubbles or shedding No corrosion Example 2 26min 3.4h No bubbles or shedding No corrosion Example 3 24min 3.2h No bubbles or shedding No corrosion Example 4 28min 3.6h No bubbles or shedding No corrosion Comparative Example 42min 4.8h Slight bubbles, shedding Slight corrosion

[0071] Therefore, it can be seen from the above table that the water-based alkyd paint prepared according to the above preparation method has better quick-drying performance and rust prevention performance than the comparative example, and has a fast film-forming speed. At the same time, it has high salt spray resistance and chemical resistance, so that the water-based alkyd paint can adapt to various changes in the external environment and meet the use requirements in different situations. It has a wide range of applications.

[0072] In summary, deionized water, wetting dispersant and defoaming agent are added to a stirring tank, stirred and mixed at low speed for 5 minutes, anti-rust pigment, filler and nano-silica are added to the stirring tank, high-speed shearing is performed for 20-30 minutes to a fineness of ≤25μm, the high-speed stirring rate is reduced to 500r / min, and water-based alkyd resin and acrylic emulsion are slowly added to the stirring tank, and co-solvent and corrosion inhibitor are added. Stir for 15 minutes until uniform, add pH regulator to the stirring tank to adjust the pH value of the coating, filter through a 200-mesh sieve to remove impurities and seal and package to prepare water-based alkyd paint, which has a fast drying speed and good anti-rust performance, and can improve the use effect of water-based alkyd paint.

[0073] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0074] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A quick-drying anti-rust water-based alkyd paint, characterized in that: Including the following raw materials by mass: 25-50 parts of water-based alkyd resin, 15-30 parts of acrylic emulsion, 10-15 parts of anti-rust pigment, 14-20 parts of filler, 3-5 parts of nano-silica, 4-6 parts of cosolvent, 0.2-1 part of pH regulator, 0.5-1 part of wetting and dispersing agent, 0.2-0.5 part of defoamer, 0.3-1 part of corrosion inhibitor and the balance of deionized water.

2. A quick-drying anti-rust water-based alkyd paint according to claim 1, characterized in that: The solid content of the acrylic emulsion is 45-55%.

3. A quick-drying anti-rust water-based alkyd paint according to claim 1, characterized in that: The anti-rust pigment is zinc phosphate.

4. A quick-drying anti-rust water-based alkyd paint according to claim 1, characterized in that: The filler is mica powder.

5. A quick-drying anti-rust water-based alkyd paint according to claim 1, characterized in that: The cosolvent is propylene glycol methyl ether.

6. A quick-drying anti-rust water-based alkyd paint according to claim 1, characterized in that: The pH regulator is one of ammonia water, NaOH and dimethylethanolamine.

7. The quick-drying anti-rust water-based alkyd paint according to claim 1, characterized in that: The corrosion inhibitor is benzotriazole.

8. A method for preparing a quick-drying anti-rust water-based alkyd paint according to any one of claims 1 to 7, characterized in that: The steps include: Add deionized water, wetting dispersant and defoaming agent into the stirring tank and stir at low speed for 5 minutes at a rate of 300-500 r / min; Add anti-rust pigment, filler and nano-silica into the stirring kettle, and high-speed shear for 20-30 minutes until the fineness is ≤25μm, and the high-speed stirring rate is 1500-2000r / min; Reduce the high-speed stirring rate to 500r / min, and slowly add water-based alkyd resin and acrylic emulsion into the stirring tank, add cosolvent and corrosion inhibitor, and stir for 15 minutes until uniform; A pH regulator was added to the stirred tank to adjust the pH value of the coating, and the coating was filtered through a 200-mesh sieve to remove impurities and sealed and packaged to prepare a water-based alkyd paint.

Images