Water-based epoxy floor paint added with sodium silicate and preparation method of water-based epoxy floor paint

Abstract

The invention discloses a water-based epoxy floor paint added with sodium silicate and a preparation method thereof, and relates to the technical field of preparation of water-based epoxy floor paints.The water-based epoxy floor paint is prepared from 600-1200 parts of deionized water, 450-600 parts of water-based epoxy resin, 100-180 parts of curing agent, 80-120 parts of pigment, 40-70 parts of sodium silicate, 40-65 parts of propylene glycol monomethyl ether and 5-15 parts of auxiliaries. According to the water-based epoxy floor paint added with sodium silicate and the preparation method of the water-based epoxy floor paint, the wear resistance and surface hardness of the prepared water-based epoxy floor paint are improved by optimizing the formula of the water-based epoxy floor paint, particularly, the sodium silicate is added, so that the compactness and hardness of a floor paint film are obviously improved, and pretreatment is performed before the sodium silicate is added, so that the water-based epoxy floor paint is more environment-friendly. The deionized water is used as a dissolving medium to prepare the sodium silicate dispersion liquid with the solid content of 20%, so that agglomeration or precipitation caused by direct use of sodium silicate in the coating is avoided, and the uniformity of the cured floor paint is facilitated.

Description

Technical Field

[0001] The invention relates to the technical field of waterborne epoxy floor paint preparation, in particular to a waterborne epoxy floor paint added with sodium silicate and a preparation method thereof. Background Art

[0002] Floor paint is a kind of coating specially used for floor decoration and protection. It is made of specific film-forming substances, pigments, fillers and additives through certain processing. Floor paint has excellent wear resistance, corrosion resistance, impact resistance, anti-slip and easy cleaning characteristics, which can significantly improve the performance and aesthetics of the floor. It is widely used in floor coating in industrial plants, warehouses, hospitals, schools, shopping malls, parking lots and other places.

[0003] Waterborne epoxy floor paint is an epoxy resin floor paint that uses water as a diluent (i.e., solvent). It is mainly composed of waterborne epoxy resin, waterborne epoxy curing agent, functional pigments and fillers, and additives. Waterborne epoxy floor paint has been widely used in the fields of modern decoration and ground protection due to its environmental protection, wear resistance, and corrosion resistance. Compared with traditional oil-based floor paint, waterborne epoxy floor paint has significant advantages in environmental protection performance because it reduces the emission of harmful gases and is more friendly to the human body and the environment. Therefore, it has gradually replaced traditional oil-based floor paint and become the mainstream of current floor paint.

[0004] However, since water-based epoxy floor paint uses water as a diluent and forms a coating through the cross-linking reaction of water-based epoxy resin and water-based epoxy curing agent, although it has significant advantages in terms of environmental protection, it is easily affected by factors such as water evaporation rate, ambient temperature and humidity during the curing process, resulting in the curing reaction being not as complete and uniform as oil-based floor paint, resulting in relatively low density and hardness of the coating. Therefore, the wear resistance and surface hardness of water-based epoxy floor paint are generally poor.

[0005] The lack of wear resistance and surface hardness limits the application of water-based epoxy floor paint in some high-load and high-wear places. For example, poor wear resistance means that the floor is more likely to wear and scratch when subjected to heavy rolling and friction, thereby shortening its overall service life. This defect is particularly obvious in places that require high wear resistance, such as factory workshops and warehouses; and poor surface hardness makes the floor prone to dents and indentations when subjected to external forces, seriously affecting the appearance and cleanliness of the ground. This is not conducive to places that need to maintain high cleanliness and beauty, such as shopping malls and hospitals. In addition, due to poor wear resistance and surface hardness, the floor may need to be repaired and refurbished more frequently to restore its performance and beauty, which will directly increase maintenance costs and time costs.

[0006] Therefore, it is urgent to improve this shortcoming. The present invention studies and improves the existing technology and its shortcomings, and provides a water-based epoxy floor paint with added sodium silicate and a preparation method thereof. Summary of the invention

[0007] The object of the present invention is to provide a water-based epoxy floor paint added with sodium silicate and a preparation method thereof, so as to solve the problems raised in the above-mentioned background technology.

[0008] To achieve the above object, the present invention provides the following technical solutions:

[0009] On the one hand, a water-based epoxy floor paint with sodium silicate added is provided, comprising the following components in parts by weight:

[0010] Deionized water (for adjusting to the required viscosity) 600-1200 parts

[0011] Water-based epoxy resin 450-600 parts

[0012] Curing agent 100~180 parts

[0013] Pigment 80-120 parts

[0014] 40-70 parts of sodium silicate

[0015] Propylene glycol methyl ether (diluent, used to adjust viscosity) 40-65 parts

[0016] 5 to 15 parts of additives.

[0017] Furthermore, the curing agent is composed of an anhydride curing agent and an amide curing agent in a weight ratio of (1-2): (8-10), and the anhydride curing agent (particularly suitable for use in low temperature environments) is selected from succinic anhydride, maleic anhydride or phthalocyanine anhydride, and the amide curing agent is selected from DMTDA or IPDTA.

[0018] Furthermore, the pigment is selected from one of iron oxide green, phthalocyanine green and titanium dioxide, wherein iron oxide green and phthalocyanine green are used to prepare green waterborne epoxy floor paint, and titanium dioxide is used to prepare white waterborne epoxy floor paint.

[0019] Furthermore, the average particle size of the sodium silicate is 80nm to 100nm, and the purity of the sodium silicate is ≥98%.

[0020] Further, the additives include a dispersant (to improve the dispersibility of the floor paint and prevent its sedimentation and agglomeration), a leveling agent (to improve the fluidity, leveling and coating properties of the liquid) and a defoamer (to eliminate or inhibit the generation of foam), and the components of the additives are as follows:

[0021] Dispersant 3-8 parts

[0022] 1 to 4 parts of leveling agent

[0023] 1 to 3 parts of defoaming agent.

[0024] Furthermore, the dispersant is a multifunctional dispersant (such as HY-257) or a copolymer dispersant containing an acidic group (such as LD-110DA, LD-110EA), and HY-257 is preferred. The leveling agent is RM-2020 (a polyurethane thickener).

[0025] Furthermore, the defoamer includes a silicone defoamer (such as TEGO-901W) and a polyether defoamer, and the silicone defoamer is added in the pigment slurry grinding stage to suppress foam generation, and the polyether defoamer is added in the paint mixing stage to further eliminate residual foam and reduce paint film defects.

[0026] On the other hand, a method for preparing a water-based epoxy floor paint with sodium silicate added is provided, which is applied to the water-based epoxy floor paint with sodium silicate added as described above, comprising the following steps:

[0027] S1. Raw material preparation: According to the formula of water-based epoxy floor paint, prepare all the raw materials required for the preparation of water-based epoxy floor paint;

[0028] S2. Sodium silicate pretreatment: Deionized water is selected as the dissolving medium, and sodium silicate is added into the deionized water. At room temperature, the sodium silicate is stirred until the sodium silicate is completely dissolved to form a sodium silicate dispersion with a solid content of 20%, so as to avoid agglomeration or precipitation of the sodium silicate when it is directly used in the coating;

[0029] S3, batching and mixing: add waterborne epoxy resin, sodium silicate dispersion, curing agent, additives and other raw materials into the batching container according to the formula ratio, and use a stirring device to gradually stir evenly to ensure that all components are fully mixed;

[0030] S4. Coloring and dilution: Add appropriate amount of pigment to the paint for coloring as needed to ensure that the paint has the required color and appropriate shade, and use propylene glycol methyl ether to dilute the paint to adjust its viscosity and construction performance;

[0031] S5. Vacuum degassing: Put the mixed paint into the vacuum degassing equipment, and remove the bubbles in the paint by vacuuming to avoid defects such as pinholes and pitting during construction;

[0032] S6. Packaging and storage: Divide the processed paint into appropriate containers, seal them, and store them in a cool, dry, ventilated warehouse, avoiding direct sunlight and high temperature.

[0033] Furthermore, in step S3, a planetary mixer is selected as the stirring equipment, and the stirring speed is gradually increased from the initial low-speed stirring to medium-high-speed stirring, specifically: the stirring rotation speed is gradually increased from 30±5r / min to 300±5r / min, the revolution speed is gradually increased from 15±5r / min to 180±5r / min, and the stirring time is 15 to 30 minutes until the coating is uniform and free of particles.

[0034] Furthermore, in step S5, the debubbling time is controlled within 10 to 15 minutes until there are no obvious bubbles in the coating.

[0035] The present invention provides a water-based epoxy floor paint with sodium silicate added and a preparation method thereof, which has the following beneficial effects:

[0036] The present invention optimizes the formula of water-based epoxy floor paint to improve the wear resistance and surface hardness of the prepared water-based epoxy floor paint, especially by adding sodium silicate, while ensuring that the environmental protection advantage of the floor paint is not affected, the density and hardness of the floor paint film are significantly improved, and pretreatment is performed before the sodium silicate is added, and deionized water is used as a dissolving medium to prepare a sodium silicate dispersion with a solid content of 20%, thereby avoiding agglomeration or precipitation caused by direct use of sodium silicate in the coating, which is beneficial to the uniformity of the floor paint after curing. In addition, during the preparation process, a defoamer is added in stages, that is, an organosilicon defoamer is added in the pigment slurry grinding stage, and a polyether defoamer is added in the paint mixing stage, so as to achieve the best defoaming effect, thereby further improving the quality of the prepared water-based epoxy floor paint. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 The present invention is a schematic flow chart of the steps of a method for preparing a water-based epoxy floor paint with sodium silicate added;

[0038] Figure 2 This is a schematic diagram comparing experimental results of a method for preparing a water-based epoxy floor paint with added sodium silicate according to the present invention. DETAILED DESCRIPTION

[0039] The following is a further detailed description of the embodiments of the present invention in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention but are not intended to limit the scope of the present invention.

[0040] Embodiment 1

[0041] A water-based epoxy floor paint with sodium silicate added, comprising the following components in parts by weight: 800 parts of deionized water, 500 parts of water-based epoxy resin, 150 parts of curing agent, 100 parts of pigment, 50 parts of sodium silicate, 50 parts of propylene glycol methyl ether, 5 parts of dispersant, 3 parts of leveling agent, and 2 parts of defoaming agent;

[0042] The curing agent is composed of an anhydride curing agent and an amide curing agent in a weight ratio of 2:9, and the anhydride curing agent (particularly suitable for use in a low temperature environment) is succinic anhydride, and the amide curing agent is DMTDA;

[0043] The pigment is selected from one of iron oxide green, phthalocyanine green and titanium dioxide. In this embodiment, if a green water-based epoxy floor paint is to be prepared, iron oxide green or phthalocyanine green is selected. If a white water-based epoxy floor paint is to be prepared, titanium dioxide is selected.

[0044] The average particle size of sodium silicate is 80nm-100nm, and the purity of sodium silicate is ≥98%;

[0045] The dispersant is HY-257;

[0046] The leveling agent is RM-2020 (a polyurethane thickener);

[0047] Defoamers include silicone defoamers (TEGO-901W) and polyether defoamers. Silicone defoamers are added during the pigment slurry grinding stage to suppress foam generation, and polyether defoamers are added during the paint mixing stage to further eliminate residual foam and reduce paint film defects.

[0048] like Figure 1 As shown, a method for preparing a water-based epoxy floor paint with added sodium silicate is applied to the water-based epoxy floor paint with added sodium silicate as mentioned above, characterized in that it comprises the following steps:

[0049] S1. Raw material preparation: According to the formula of water-based epoxy floor paint, prepare all the raw materials required for the preparation of water-based epoxy floor paint;

[0050] S2. Sodium silicate pretreatment: Deionized water is selected as the dissolving medium, and sodium silicate is added into the deionized water. At room temperature, the sodium silicate is stirred until the sodium silicate is completely dissolved to form a sodium silicate dispersion with a solid content of 20%, so as to avoid agglomeration or precipitation of the sodium silicate when it is directly used in the coating;

[0051] S3, batching and mixing: add waterborne epoxy resin, sodium silicate dispersion, curing agent, additives and other raw materials into the batching container according to the formula ratio, and use a stirring device to gradually stir evenly to ensure that all components are fully mixed;

[0052] In this embodiment, a planetary mixer is selected as the stirring equipment, and the stirring speed is gradually increased from the initial low-speed stirring to the medium-high speed stirring, specifically: the stirring rotation speed is gradually increased from 30±5r / min to 300±5r / min, the revolution speed is gradually increased from 15±5r / min to 180±5r / min, and the stirring time is 15 to 30 minutes until the coating is uniform and free of particles;

[0053] In this embodiment, the additives added in this step include a dispersant, a leveling agent, and a defoamer, wherein the defoamer added in this stage is specifically an organosilicon defoamer (TEGO-901W);

[0054] S4. Coloring and dilution: Add appropriate amount of pigment to the paint for coloring as needed to ensure that the paint has the required color and appropriate shade, and use propylene glycol methyl ether to dilute the paint to adjust its viscosity and construction performance;

[0055] In this embodiment, a polyether defoamer is added simultaneously with propylene glycol methyl ether in this step to further eliminate residual foam and reduce paint film defects;

[0056] S5. Vacuum degassing: put the mixed paint into the vacuum degassing equipment, and remove the bubbles in the paint by vacuuming. The degassing time is controlled within 10 to 15 minutes until there are no obvious bubbles in the paint, so as to avoid defects such as pinholes and pitting during construction;

[0057] S6. Packaging and storage: Divide the processed paint into appropriate containers, seal them, and store them in a cool, dry, ventilated warehouse, avoiding direct sunlight and high temperature.

[0058] Experimental testing

[0059] In order to more clearly illustrate the content of the present invention, the water-based epoxy floor paint prepared in Example 1 and commercially available oily floor paint (purchased from Hangzhou Maiyuan Decoration Engineering Co., Ltd.) and commercially available water-based epoxy floor paint (purchased from Hangzhou Maiyuan Decoration Engineering Co., Ltd.) were subjected to performance tests. The specific test items were wear resistance and surface hardness, as well as the environmental friendliness of the raw material components; among them, the wear resistance test referred to the national standard GB / T 1768, and the specific test floor was tested for wear and scratches when subjected to heavy rolling, friction, etc.; the surface hardness test referred to the national standard HG / T3829-2006, and the specific test floor was tested for depressions and indentations when subjected to external forces. The environmental friendliness of the raw material components was tested with reference to the national standard GB / T 22374-2018, and the test mainly focused on the content of volatile organic compounds (VOCs), free formaldehyde, benzene series (benzene, toluene, ethylbenzene and xylene) and other harmful substances. The test results are as follows: Figure 2 As shown;

[0060] Combination Figure 2 It can be seen that the water-based epoxy floor paint prepared in Example 1 has significantly improved wear resistance and surface hardness compared with commercially available water-based epoxy floor paint, and the environmental friendliness of the raw material components is significantly lower than that of commercially available oil-based epoxy floor paint, which solves the problem that traditional water-based epoxy floor paint has strong environmental performance but poor wear resistance and surface hardness.

[0061] The embodiments of the present invention are given for the purpose of illustration and description, and are not intended to be exhaustive or to limit the invention to the disclosed forms. Many modifications and variations will be apparent to those of ordinary skill in the art. The embodiments are selected and described in order to better illustrate the principles and practical applications of the present invention and to enable those of ordinary skill in the art to understand the present invention and thereby design various embodiments with various modifications suitable for specific uses.

Claims

1. A water-based epoxy floor paint with sodium silicate added, characterized in that: The composition comprises the following components in parts by weight: 600-1200 parts of deionized water Water-based epoxy resin 450-600 parts Curing agent 100~180 parts Pigment 80-120 parts 40-70 parts of sodium silicate Propylene glycol methyl ether 40-65 parts 5 to 15 parts of additives.

2. A water-based epoxy floor paint with sodium silicate added according to claim 1, characterized in that: The curing agent is composed of an anhydride curing agent and an amide curing agent in a weight ratio of (1-2): (8-10), and the anhydride curing agent is selected from succinic anhydride, maleic anhydride or phthalocyanine anhydride, and the amide curing agent is selected from DMTDA or IPDTA.

3. A water-based epoxy floor paint with sodium silicate added according to claim 1, characterized in that: The pigments include but are not limited to iron oxide green, phthalocyanine green, and titanium dioxide, wherein iron oxide green and phthalocyanine green are used to prepare green waterborne epoxy floor paints, and titanium dioxide is used to prepare white waterborne epoxy floor paints.

4. A water-based epoxy floor paint with sodium silicate added according to claim 1, characterized in that: The average particle size of the sodium silicate is 80nm-100nm, and the purity of the sodium silicate is ≥98%.

5. A water-based epoxy floor paint with sodium silicate added according to claim 1, characterized in that: The auxiliary agent includes a dispersant, a leveling agent and a defoamer, and the components of the auxiliary agent are as follows: Dispersant 3-8 parts 1 to 4 parts of leveling agent 1 to 3 parts of defoaming agent.

6. A water-based epoxy floor paint with sodium silicate added according to claim 5, characterized in that: The dispersant is a multifunctional dispersant or a copolymer dispersant containing an acidic group, and HY-257 is preferably selected, and the leveling agent is RM-2020.

7. A water-based epoxy floor paint with sodium silicate added according to claim 5, characterized in that: The defoamer comprises an organosilicon defoamer and a polyether defoamer, and the organosilicon defoamer is added in the pigment slurry grinding stage to suppress the generation of foam, and the polyether defoamer is added in the paint mixing stage to further eliminate residual foam and reduce paint film defects.

8. A method for preparing a waterborne epoxy floor paint with sodium silicate added, applied to the waterborne epoxy floor paint with sodium silicate added as claimed in any one of claims 1 to 7, characterized in that: The following steps are involved: S1. Raw material preparation: According to the formula of water-based epoxy floor paint, prepare all the raw materials required for the preparation of water-based epoxy floor paint; S2. Sodium silicate pretreatment: Deionized water is selected as the dissolving medium, and sodium silicate is added into the deionized water, and stirred at room temperature until the sodium silicate is completely dissolved to form a sodium silicate dispersion with a solid content of 20%; S3, batching and mixing: add various raw materials including waterborne epoxy resin, sodium silicate dispersion, curing agent and additives into the batching container according to the formula ratio, and gradually stir evenly using a stirring device to ensure that all components are fully mixed; S4. Coloring and dilution: Add pigments to the paint for coloring as needed to ensure that the paint has the desired color and is of appropriate shade, and use propylene glycol methyl ether to dilute the paint to adjust its viscosity and construction performance; S5. Vacuum degassing: put the mixed paint into the vacuum degassing equipment and remove the bubbles in the paint by vacuuming; S6. Packaging and storage: Divide the processed paint into appropriate containers, seal them, and store them in a cool, dry, ventilated warehouse, avoiding direct sunlight and high temperature.

9. The method for preparing a water-based epoxy floor paint adding sodium silicate according to claim 8, characterized in that: In step S3, a planetary mixer is selected as the stirring equipment, and the stirring speed is gradually increased from the initial low-speed stirring to medium-high-speed stirring, specifically: the stirring rotation speed is gradually increased from 30±5r / min to 300±5r / min, the revolution speed is gradually increased from 15±5r / min to 180±5r / min, and the stirring time is 15 to 30 minutes until the coating is uniform and free of particles.

10. The method for preparing a water-based epoxy floor paint with sodium silicate added according to claim 9, characterized in that: In step S5, the debubbling time is controlled within 10 to 15 minutes until there are no obvious bubbles in the coating.

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