Aurora cover varnish and preparation method thereof

Abstract

The present invention relates to an aurora topcoat varnish and a preparation method thereof, and relates to the technical field of varnish preparation. The aurora topcoat varnish comprises the following raw materials, measured by weight: 65-75 parts of an emulsion, 25-35 parts of sand flour, 0.5-0.7 parts of a first thickener, 0.5-0.7 parts of a second thickener, and 1.5-3.0 parts of a film-forming aid. The present invention uses the emulsion, sand flour, a polyurethane medium shear thickener as the first thickener, a polyurethane high shear thickener as the second thickener, and the film-forming aid to work together to produce an aurora topcoat varnish having the characteristics of excellent scratch resistance, high hardness, high transparency, and easy construction, thereby better meeting consumer use needs and construction requirements.

Description

Technical Field

[0001] The invention relates to the technical field of varnish preparation, in particular to an aurora topcoat varnish and a preparation method thereof. Background Art

[0002] Aurora topcoat varnish is a scraping-type paste-like topcoat varnish. After the construction is completely dry, the originally dull wall can be transformed into a wall effect with a marble texture by grinding and polishing the paint film, without covering the visual color of the base material and other effects. The flat effect is like the brightness and flatness of jade, giving a certain visual coolness, and the texture is delicate like jade, which meets people's usage needs. Most of the Aurora topcoats on the market now have an emulsion content of 80-90%. There is no powder in the paint, and the actual solid content is only 35-45%. The normal construction process requires three coats of Aurora topcoat (and light grinding before scraping to ensure better adhesion between layers) to obtain a certain thickness to meet use, and then grinding, and finally polishing with a wool ball to obtain an "imitation jade" effect. The process is extremely complicated, and the hardness of the obtained cover is relatively low, and slight bumps can easily leave scratches.

[0003] Therefore, there is an urgent need to develop an aurora topcoat varnish that has excellent scratch resistance, high hardness, high transparency and easy construction, so as to better meet the consumer's use needs and construction requirements. Summary of the Invention

[0004] In order to solve the above problems, the present invention provides an aurora topcoat varnish and a preparation method thereof.

[0005] In a first aspect, the present invention provides an aurora top coat varnish, which comprises the following raw materials in parts by weight:

[0006] 65-75 parts of emulsion, 25-35 parts of sand flour, 0.5-0.7 parts of first thickener, 0.5-0.7 parts of second thickener and 1.5-3.0 parts of film-forming aid;

[0007] The glass transition temperature of the emulsion is ≥20° C., the particle size of the sand flour is 5-10 μm, the first thickener is a polyurethane medium shear thickener, and the second thickener is a polyurethane high shear thickener.

[0008] Furthermore, the Aurora topcoat varnish further comprises, by weight: 0.5-1.5 parts of antifreeze agent and 0.1-0.3 parts of defoaming agent.

[0009] Furthermore, the antifreeze is an alcohol antifreeze, the defoamer is a mineral oil defoamer, and the thickening shear rate of the shear thickener in the polyurethane is 10-100s -1The thickening shear rate of the polyurethane high shear thickener is 100~10000s -1 , the glass transition temperature of the emulsion is 20~40°C.

[0010] Furthermore, the film-forming aid includes at least one of an alcohol ester film-forming aid and a mixed ester film-forming aid.

[0011] Furthermore, the aurora topcoat varnish comprises the following raw materials in parts by weight:

[0012] 70.95 parts of emulsion, 25 parts of sand flour, 0.5 parts of a first thickener, 0.5 parts of a second thickener, 1.5 parts of a film-forming aid, 0.8 parts of an antifreeze agent, 0.3 parts of a defoaming agent, 0.25 parts of a fungicide, and 0.2 parts of a preservative;

[0013] Wherein, the sand flour is composed of sand flour with a particle size of 5 μm; or,

[0014] The sand flour is composed of sand flour with a particle size of 5 μm and sand flour with a particle size of 10 μm in a weight ratio of 15:10; or,

[0015] The sand flour is composed of sand flour with a particle size of 10 μm.

[0016] Furthermore, the aurora topcoat varnish comprises the following raw materials in parts by weight:

[0017] 65.95 parts of emulsion, 30 parts of sand flour, 0.5 parts of a first thickener, 0.5 parts of a second thickener, 1.5 parts of a film-forming aid, 0.8 parts of an antifreeze agent, 0.3 parts of a defoaming agent, 0.25 parts of a fungicide, and 0.2 parts of a preservative;

[0018] Wherein, the sand flour is composed of sand flour with a particle size of 5 μm; or,

[0019] The sand flour is composed of sand flour with a particle size of 5 μm and sand flour with a particle size of 10 μm in a weight ratio of 15:15.

[0020] Furthermore, the aurora topcoat varnish comprises the following raw materials in parts by weight:

[0021] 65.75 parts of emulsion, 30 parts of sand flour, 0.6 parts of first thickener, 0.6 parts of second thickener, 1.5 parts of film-forming aid, 0.8 parts of antifreeze agent, 0.3 parts of defoaming agent, 0.25 parts of fungicide and 0.2 parts of preservative;

[0022] Wherein, the sand flour is composed of sand flour with a particle size of 10 μm.

[0023] In a second aspect, the present invention provides a method for preparing the aurora top coat varnish according to any one of the first aspects, the preparation method comprising the following steps:

[0024] The emulsion, antifreeze agent, defoaming agent and film-forming aid are first stirred and mixed to obtain a first mixture;

[0025] adding a first thickener, a second thickener and the hydrophilically modified sand flour to the first mixture in sequence and performing a second stirring and mixing process to obtain a second mixture;

[0026] Add a fungicide and a preservative to the second mixture and perform a third stirring and mixing to obtain the Aurora topcoat varnish.

[0027] Furthermore, the working parameters of the first stirring and mixing include: a stirring speed of 250~350 r / min, and a time of 2~5 minutes; the working parameters of the second stirring and mixing include: a stirring speed of 800~1000 r / min, and a time of 15~25 minutes; and the working parameters of the third stirring and mixing include: a stirring speed of 750~850 r / min, and a time of 8~15 minutes.

[0028] The above technical solution provided by the embodiment of the present invention has at least the following advantages compared with the prior art:

[0029] The present invention provides an Aurora topcoat varnish and a preparation method thereof. By using an emulsion, sand flour, a polyurethane medium shear thickener as a first thickener, a polyurethane high shear thickener as a second thickener, and a film-forming aid in a coordinated manner, an Aurora topcoat varnish having excellent scratch resistance, high hardness, high transparency, and easy construction is produced, which can better meet consumer demand and construction requirements. Specifically:

[0030] 1) The construction is convenient and saves construction times. Two passes of scraping can obtain the thickness that meets the use requirements, compared with the Aurora cover construction on the market. The Aurora cover construction process on the market: the first pass of scraping, light polishing with 1000 mesh sandpaper, the second pass of scraping, light polishing with 1000 mesh sandpaper, the third pass of scraping, sanding with 800 mesh or more to a matte effect, and polishing with a wool ball. The Aurora cover construction process of the present invention: the first pass of scraping, the second pass of scraping, sanding with 800 mesh or more to a matte effect, and polishing with a wool ball, saving one scraping process and two polishing processes.

[0031] 2) Excellent scratch resistance and high transparency can be obtained. The aurora cover on the market is a pure emulsion. The hardness of the paint film is only provided by the hardness of the emulsion. In addition, the paint film has a certain thickness, taking into account the excellent film-forming property of the emulsion. Its hardness is relatively low, and it is easy to get scratches when bumped. The excellent scratch resistance in the present invention is mainly improved by changing the hardness of the product and the friction coefficient of the surface. First, it comes from the selection of high-hardness emulsion. Second, it comes from the high-hardness filled sand powder in it, with a Tg (glass transition temperature) of 180°C. In addition, the sand powder will not affect the transparency of the paint film. Third, the use of the sand powder can reduce the dynamic friction coefficient of the paint film surface.

[0032] 3) Regarding the ease of construction, the Aurora finish on the market is a pure emulsion system without any powder, so the solid content is only 35-45%. Even if it is made into a paste, the paint film it scrapes out is still relatively thin after drying. Although the force of scraping can be controlled, the thicker the scraping, the more difficult it is to level it. Therefore, multiple thin coats are required. In addition, the low solid content results in a thinner paint film after scraping. Therefore, most Aurora finishes on the market require three thin coats of paint, and slight sanding is required before the second and third scraping (pure emulsion leveling The surface smoothness is high enough and not easy to adhere to the second time) in order to better rivet, the Aurora topcoat varnish of the present invention is filled with 25%-30% sand powder of different particle sizes, so that the solid content of the cover can reach 58%-65%. At the same time, due to the powder in the system, it will be smoother when scraping, and the amount of paint applied in one batch will also be larger. Therefore, only two batches are needed to achieve the dry film thickness of the Aurora topcoat on the market that is scraped three times, and due to the presence of sand powder, the paint film surface is rougher, and the second coat can be scraped without polishing after the first coat is dry. Compared with the construction process on the market, it saves one batch scraping process and two polishing processes.

[0033] 4) Regarding the hardness and scratch resistance of the coating, scratch resistance refers to the ability of the material surface to resist scratches to a certain extent, that is, it is not easily damaged or forms obvious scratches when scratched or rubbed. It is mainly affected by two aspects. The first is the material's own ability to resist deformation, that is, hardness. The higher the hardness, the better the scratch resistance. The second is the friction coefficient of the material surface. According to f=uFN, the smaller the friction coefficient, the smaller the friction force when moving under the same pressure, that is, the smaller the reaction force of the object on the material, the smaller the damage. The specific method is to use a small-particle emulsion with a high Tg. The paint film formed has good hardness and is more dense. At the same time, 25%-30% sand powder (high-density polyethylene wax powder) can be used to improve the overall hardness of the paint film. The use of sand powder also makes the paint film obtain a lower friction coefficient, which greatly improves the hardness and scratch resistance of the paint film.

[0034] 5) Regarding the transparency of the paint film, it is related to the refractive index difference between the substances contained in the paint film and the amount used. The smaller the refractive index difference between the substances contained, the higher the transparency. It is also affected by the surface roughness of the paint film. When the roughness of the paint film reaches a certain level, the diffuse reflection of light is too much, thereby affecting the transparency of the paint film, similar to the feeling of "frosted glass". The present invention selects sand flour to be high density polyethylene wax powder, belong to organic polymer, close to the refractive index of organic substances such as pure acrylic emulsion, and using the sand flour of 25%-30% when film forming, can be wrapped by emulsion completely, the sand flour particle diameter that the present invention chooses simultaneously is between 5um-10um, because when the particle diameter of sand flour is too large, can cause surface to be comparatively coarse, the diffuse reflection formed during light incidence is more, makes paint film fuzzy, although can make surface smooth by polishing, improve specular reflection and transparency, but when particle diameter is too large, can cause paint film surface concave-convex sense more intense, the height distance between concave and convex will be larger, therefore need to polish to certain thickness just can reach the flatness and the transparency of needs, to meet imitation jade effect, increased artificial material resources etc., also consume paint film thickness too much.Therefore by using the high density polyethylene wax powder of 25-30% of 5-10um and use the distinctive construction technology of the present invention, can reach imitation jade effect.

[0035] 6) Regarding the dispersibility of sand flour and the storage stability of topcoat varnish, the sand flour itself has been hydrophilically modified and can be dispersed under high shear conditions. It forms a hydration layer on the surface when it comes into contact with water. In addition, the specific gravity of sand flour is 0.98-1.02g / cm 3 , which is close to the covering system. According to the Stokes formula, the closer the particle density is to the density of the dispersion medium and the higher the fluid viscosity is, the lower the sedimentation rate will be. The specific gravity of the sand flour in the present invention is very close to the density of the dispersion medium and the state is paste-like, so its storage stability is excellent. In addition, the covering system of the present invention uses a polyurethane thickener to thicken the emulsion phase, so that the system is uniform and stable, and the shear dispersion viscosity is high. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0037] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0038] Figure 1 The present invention provides a flowchart of a method for preparing the aurora cover varnish according to an embodiment of the present invention. DETAILED DESCRIPTION

[0039] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are 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 shall fall within the scope of protection of the present invention.

[0040] Unless otherwise specified, various raw materials, reagents, instruments and equipment used in the present invention can be purchased from the market or prepared by existing methods.

[0041] In a first aspect, the present invention provides an aurora top coat varnish, which comprises the following raw materials in parts by weight:

[0042] 65-75 parts of emulsion, 25-35 parts of sand flour, 0.5-0.7 parts of first thickener, 0.5-0.7 parts of second thickener and 1.5-3.0 parts of film-forming aid;

[0043] The glass transition temperature of the emulsion is ≥20° C., the particle size of the sand flour is 5-10 μm, the first thickener is a polyurethane medium shear thickener, and the second thickener is a polyurethane high shear thickener.

[0044] The present invention provides an Aurora topcoat varnish and a preparation method thereof. By using an emulsion, sand flour, a polyurethane medium shear thickener as a first thickener, a polyurethane high shear thickener as a second thickener, and a film-forming aid in a coordinated manner, an Aurora topcoat varnish having excellent scratch resistance, high hardness, high transparency, and easy construction is produced, which can better meet consumer demand and construction requirements. Specifically:

[0045] 1) The construction is convenient and saves construction times. Two passes of scraping can obtain the thickness that meets the use requirements, compared with the Aurora cover construction on the market. The Aurora cover construction process on the market: the first pass of scraping, light polishing with 1000 mesh sandpaper, the second pass of scraping, light polishing with 1000 mesh sandpaper, the third pass of scraping, sanding with 800 mesh or more to a matte effect, and polishing with a wool ball. The Aurora cover construction process of the present invention: the first pass of scraping, the second pass of scraping, sanding with 800 mesh or more to a matte effect, and polishing with a wool ball, saving one scraping process and two polishing processes.

[0046] 2) Excellent scratch resistance and high transparency can be obtained. The aurora cover on the market is a pure emulsion. The hardness of the paint film is only provided by the hardness of the emulsion. In addition, the paint film has a certain thickness, taking into account the excellent film-forming property of the emulsion. Its hardness is relatively low, and it is easy to get scratches when bumped. The excellent scratch resistance in the present invention is mainly improved by changing the hardness of the product and the friction coefficient of the surface. First, it comes from the selection of high-hardness emulsion. Second, it comes from the high-hardness filled sand powder in it, with a Tg (glass transition temperature) of 180°C. In addition, the sand powder will not affect the transparency of the paint film. Third, the use of the sand powder can reduce the dynamic friction coefficient of the paint film surface.

[0047] 3) Regarding the ease of construction, the Aurora finish on the market is a pure emulsion system without any powder, so the solid content is only 35-45%. Even if it is made into a paste, the paint film it scrapes out is still relatively thin after drying. Although the force of scraping can be controlled, the thicker the scraping, the more difficult it is to level it. Therefore, multiple thin coats are required. In addition, the low solid content results in a thinner paint film after scraping. Therefore, most Aurora finishes on the market require three thin coats of paint, and slight sanding is required before the second and third scraping (pure emulsion leveling The surface smoothness is high enough and not easy to adhere to the second time) in order to better rivet, the Aurora topcoat varnish of the present invention is filled with 25%-30% sand powder of different particle sizes, so that the solid content of the cover can reach 58%-65%. At the same time, due to the powder in the system, it will be smoother when scraping, and the amount of paint applied in one batch will also be larger. Therefore, only two batches are needed to achieve the dry film thickness of the Aurora topcoat on the market that is scraped three times, and due to the presence of sand powder, the paint film surface is rougher, and the second coat can be scraped without polishing after the first coat is dry. Compared with the construction process on the market, it saves one batch scraping process and two polishing processes.

[0048] 4) Regarding the hardness and scratch resistance of the coating, scratch resistance refers to the ability of the material surface to resist scratches to a certain extent, that is, it is not easily damaged or forms obvious scratches when scratched or rubbed. It is mainly affected by two aspects. The first is the material's own ability to resist deformation, that is, hardness. The higher the hardness, the better the scratch resistance. The second is the friction coefficient of the material surface. According to f=uFN, the smaller the friction coefficient, the smaller the friction force when moving under the same pressure, that is, the smaller the reaction force of the object on the material, the smaller the damage. The specific method is to use a small-particle emulsion with a high Tg. The paint film formed has good hardness and is more dense. At the same time, 25%-30% sand powder (high-density polyethylene wax powder) can be used to improve the overall hardness of the paint film. The use of sand powder also makes the paint film obtain a lower friction coefficient, which greatly improves the hardness and scratch resistance of the paint film.

[0049] 5) Regarding the transparency of the paint film, it is related to the refractive index difference between the substances contained in the paint film and the amount used. The smaller the refractive index difference between the substances contained, the higher the transparency. It is also affected by the surface roughness of the paint film. When the roughness of the paint film reaches a certain level, the diffuse reflection of light is too much, thereby affecting the transparency of the paint film, similar to the feeling of "frosted glass". The present invention selects sand flour to be high density polyethylene wax powder, belong to organic polymer, close to the refractive index of organic substances such as pure acrylic emulsion, and using the sand flour of 25%-30% when film forming, can be wrapped by emulsion completely, the sand flour particle diameter that the present invention chooses simultaneously is between 5um-10um, because when the particle diameter of sand flour is too large, can cause surface to be comparatively coarse, the diffuse reflection formed during light incidence is more, makes paint film fuzzy, although can make surface smooth by polishing, improve specular reflection and transparency, but when particle diameter is too large, can cause paint film surface concave-convex sense more intense, the height distance between concave and convex will be larger, therefore need to polish to certain thickness just can reach the flatness and the transparency of needs, to meet imitation jade effect, increased artificial material resources etc., also consume paint film thickness too much.Therefore by using the high density polyethylene wax powder of 25-30% of 5-10um and use the distinctive construction technology of the present invention, can reach imitation jade effect.

[0050] 6) Regarding the dispersibility of sand flour and the storage stability of topcoat varnish, the sand flour itself has been hydrophilically modified and can be dispersed under high shear conditions. It forms a hydration layer on the surface when it comes into contact with water. In addition, the specific gravity of sand flour is 0.98-1.02g / cm 3 , which is close to the covering system. According to the Stokes formula, the closer the particle density is to the density of the dispersion medium and the higher the fluid viscosity is, the lower the sedimentation rate will be. The specific gravity of the sand flour in the present invention is very close to the density of the dispersion medium and the state is paste-like, so its storage stability is excellent. In addition, the covering system of the present invention uses a polyurethane thickener to thicken the emulsion phase, so that the system is uniform and stable, and the shear dispersion viscosity is high.

[0051] In some specific embodiments, the weight parts of the emulsion may be 65 parts, 66 parts, 67 parts, 68 parts, 69 parts, 70 parts, 71 parts, 72 parts, 73 parts, 74 parts, 75 parts, etc.

[0052] In some specific embodiments, the weight proportions of the sand flour may be 25 parts, 26 parts, 27 parts, 28 parts, 29 parts, 30 parts, 31 parts, 32 parts, 33 parts, 34 parts, 35 parts, etc.

[0053] In some specific embodiments, the weight percentage of the first thickener may be 0.5 parts, 0.6 parts, 0.7 parts, etc.

[0054] In some specific embodiments, the weight percentage of the second thickener may be 0.5 parts, 0.6 parts, 0.7 parts, etc.

[0055] In some specific embodiments, the weight proportions of the film-forming aid may be 1.5 parts, 1.6 parts, 1.7 parts, 1.8 parts, 1.9 parts, 2.0 parts, 2.1 parts, 2.2 parts, 2.3 parts, 2.4 parts, 2.5 parts, 2.6 parts, 2.7 parts, 2.8 parts, 2.9 parts, 3.0 parts, etc.

[0056] In some specific embodiments, the Aurora topcoat varnish further comprises, by weight: 0.5-1.5 parts of antifreeze agent and 0.1-0.3 parts of defoaming agent.

[0057] In some specific embodiments, the antifreeze agent is an alcohol antifreeze agent, the defoamer is a mineral oil defoamer, and the thickening shear rate of the shear thickener in the polyurethane is 10-100s -1 The thickening shear rate of the polyurethane high shear thickener is 100~10000s -1 , the glass transition temperature of the emulsion is 20~40°C.

[0058] In some specific embodiments, the film-forming aid includes at least one of an alcohol ester film-forming aid and a mixed ester film-forming aid.

[0059] In some specific embodiments, the aurora topcoat varnish comprises the following raw materials in parts by weight:

[0060] 70.95 parts of emulsion, 25 parts of sand flour, 0.5 parts of a first thickener, 0.5 parts of a second thickener, 1.5 parts of a film-forming aid, 0.8 parts of an antifreeze agent, 0.3 parts of a defoaming agent, 0.25 parts of a fungicide, and 0.2 parts of a preservative;

[0061] Wherein, the sand flour is composed of sand flour with a particle size of 5 μm; or,

[0062] The sand flour is composed of sand flour with a particle size of 5 μm and sand flour with a particle size of 10 μm in a weight ratio of 15:10; or,

[0063] The sand flour is composed of sand flour with a particle size of 10 μm.

[0064] In some specific embodiments, the aurora topcoat varnish comprises the following raw materials in parts by weight:

[0065] 65.95 parts of emulsion, 30 parts of sand flour, 0.5 parts of a first thickener, 0.5 parts of a second thickener, 1.5 parts of a film-forming aid, 0.8 parts of an antifreeze agent, 0.3 parts of a defoaming agent, 0.25 parts of a fungicide, and 0.2 parts of a preservative;

[0066] Wherein, the sand flour is composed of sand flour with a particle size of 5 μm; or,

[0067] The sand flour is composed of sand flour with a particle size of 5 μm and sand flour with a particle size of 10 μm in a weight ratio of 15:15.

[0068] In some specific embodiments, the aurora topcoat varnish comprises the following raw materials in parts by weight:

[0069] 65.75 parts of emulsion, 30 parts of sand flour, 0.6 parts of first thickener, 0.6 parts of second thickener, 1.5 parts of film-forming aid, 0.8 parts of antifreeze agent, 0.3 parts of defoaming agent, 0.25 parts of fungicide and 0.2 parts of preservative;

[0070] Wherein, the sand flour is composed of sand flour with a particle size of 10 μm.

[0071] It should be noted that the components and raw materials involved in the aurora topcoat varnish provided by the present invention can all be commercially available products unless otherwise specified or specified.

[0072] In the second aspect, based on the same inventive concept, the present invention provides a method for preparing the aurora topcoat varnish according to any one of the first aspects, such as Figure 1 As shown, the preparation method comprises the following steps:

[0073] The emulsion, antifreeze agent, defoaming agent and film-forming aid are first stirred and mixed to obtain a first mixture;

[0074] adding a first thickener, a second thickener and the hydrophilically modified sand flour to the first mixture in sequence and performing a second stirring and mixing process to obtain a second mixture;

[0075] Add a fungicide and a preservative to the second mixture and perform a third stirring and mixing to obtain the Aurora topcoat varnish.

[0076] The preparation method of the aurora topcoat varnish provided by the embodiment of the present invention is simple to operate, does not require additional specific operating equipment, and is suitable for mass industrial production.

[0077] In some specific embodiments, the working parameters of the first stirring and mixing include: a stirring speed of 250~350r / min, and a time of 2~5 minutes; the working parameters of the second stirring and mixing include: a stirring speed of 800~1000r / min, and a time of 15~25 minutes; the working parameters of the third stirring and mixing include: a stirring speed of 750~850r / min, and a time of 8~15 minutes.

[0078] It should be noted that in the preparation method of the aurora topcoat varnish provided by the present invention, if there are no special restrictions or specific operating steps and process parameters, they can be carried out according to the existing coating preparation process, and the present invention will not go into details one by one.

[0079] The present invention will be further described below in conjunction with specific examples. It should be understood that these examples are intended to illustrate the present invention only and are not intended to limit the scope of the invention. The experimental methods in the following examples where specific conditions are not specified are generally measured in accordance with national standards. If there are no corresponding national standards, then the methods are carried out in accordance with general international standards, conventional conditions, or the conditions recommended by the manufacturer.

[0080] The raw material product information involved in the following examples and comparative examples is as follows:

[0081] The antifreeze agent selected is propylene glycol; the small particle size high Tg emulsion selected is RS-8760 from Badfu, with a particle size of 70-120nm, an MFT of 20±2℃, and a solid content of 46±1; the sand powder selected is Siluoer's Siluoer series models Siluoer05 (5um), Siluoer10 (10um), and Siluoer15 (15um); the defoaming agent selected is BASF's ST 2410 AC; the film-forming agent selected is LOCA TS from Shengxingxing; the fungicide selected is EG CONC from Thor Chemical; the preservative selected is PW40 from Troy; the polyurethane medium shear thickener (first thickener) selected is Wanhua's U604; the polyurethane high shear thickener (second thickener) selected is Wanhua's U300.

[0082] Examples 1 to 6 provide an aurora topcoat varnish, the production process of which is as follows:

[0083] Add 65-75 parts by weight of emulsion (high Tg emulsion) into a dispersion tank, slowly add 0.5-1.5 parts by weight of antifreeze, 0.1-0.3 parts by weight of defoamer, and 1.5-3.0 parts by weight of film-forming aid while stirring at a low speed of 300 r / min, slowly add 0.5-0.7 parts by weight of polyurethane medium shear thickener after stirring for 3 minutes, and slowly increase the speed to 800 r / min. After stirring for 2 minutes, add 0.5-0.7 parts by weight of polyurethane high shear thickener, increase the speed to 1000 r / min, then add 25-35 parts by weight of sand flour, stir and disperse for 20 minutes, reduce the speed to 800 r / min, then add 0.2-0.3 parts by weight of fungicide and 0.2-0.6 parts by weight of preservative, stir for 10 minutes and then discharge.

[0084] The specific weight parts of each component in Examples 1 to 6 are shown in Table 1.

[0085] Table 1

[0086]

[0087] Comparative Example 1: Based on Example 1, RS-8760 emulsion was used in equal amounts to replace sand flour; the remaining steps and parameters were the same.

[0088] Comparative Example 2: Based on Example 1, all the sand flour was replaced with Siluoer05 (5um), and the dosage was adjusted to 15 parts by weight, and the dosage of RS-8760 emulsion was adjusted to 80.95 parts by weight; the remaining steps and parameters were the same.

[0089] Comparative Example 3: Based on Example 1, all the sand flour was replaced with Siluoer05 (5um), and the dosage was adjusted to 35 parts by weight, and the dosage of RS-8760 emulsion was adjusted to 60.95 parts by weight; the remaining steps and parameters were the same.

[0090] Comparative Example 4: Based on Example 1, all sand powder was replaced with Siluoer 15 (15 μm); the remaining steps and parameters were the same.

[0091] Comparative Example 5: Based on Example 1, the amount of polyurethane medium shear thickener and high shear thickener was adjusted to 0.7 parts by weight, and the amount of RS-8760 emulsion was adjusted to 70.55 parts by weight; the remaining steps and parameters were the same.

[0092] Comparative Example 6: Based on Example 1, the production process was changed, and the sand flour was placed in front of the polyurethane thickener and added. The speed was adjusted to 1000 r / min, and after dispersion for 20 minutes, the polyurethane medium shear thickener and high shear thickener were added. After stirring for 3 minutes, the speed was reduced to 800 r / min, and then the bactericide and preservative were added. The material was discharged after stirring for 10 minutes; the remaining steps and parameters were the same.

[0093] Comparative Example 7: Based on Example 1, an equal amount of unmodified sand flour was used to replace the Siluoer series sand flour; the remaining steps and parameters were the same.

[0094] Test Case

[0095] This example conducts a performance test on the Aurora topcoat varnish provided in Examples 1 to 6 and Comparative Examples 1 to 7, specifically including the following tests: 1) Consistency: the topcoat is tested for consistency using a consistency meter at 25±1°C; 2) Construction status: divided into smoothness of scraping and shaping, wherein 5 people are selected to score the smoothness of scraping, with 10 points as the full score and 6 points as the passing score. The better the construction smoothness, the higher the score. The shaping condition is divided into stable shaping and unstable shaping; 3) Gloss: on a flat surface such as latex paint, the process of the present invention is applied. After drying for a week, the gloss meter is used to test the gloss at 20°, 60°, and 85° before and after grinding and polishing; 4) Polishability: a wool polishing machine is used, the gear number is adjusted to 5, the polishing area is 1 m2, and the time from the matte effect to the imitation jade effect is recorded. The shorter the time, the better the polishability; 5) Transparency: on a red latex paint sample (half of the sample is applied), the process of the present invention is applied. After drying for one week, the surface can be visually inspected and compared with the unapplied surface to see if it is clear; 6) Anti-graffiti performance (12-color watercolor pen): the red latex paint sample is constructed according to the process of the present invention. After drying for one week, the 12-color watercolor pen is tested under a wet rag for wiping immediately, 1 hour, and 24 hours. After drying, observe whether there is any mark. The full score is 10 points and 6 points is a pass. Comparison and scoring are performed; 7) Scratch resistance of the paint film is mainly reflected by hardness and friction coefficient. The higher the hardness and the smaller the friction coefficient, the better the scratch resistance; 8) Paint Film feel: The paint was applied according to the process of the present invention on a red latex paint sample. After drying for one week, 10 guests were invited to conduct a blind test to evaluate the paint film. The paint film was directly touched by hand and scored equally, with 10 being the highest. The results were averaged. 9) Low-temperature film-forming property: 200 μm, 400 μm, 600 μm, 800 μm, and 1000 μm molds were made on a glass plate. The molds were immediately placed in a constant temperature box at 2°C for 24 hours and then taken out to observe cracking. 10) Freeze-thaw stability: 200 ml bottles were filled with 2 / 3, place in a -7℃ constant temperature box, take out and place at room temperature after 18 hours, place in a -7℃ constant temperature and humidity box again after 6 hours, and repeat this cycle 3 times. If the stirring is fluid and there are no particles, it passes, otherwise it fails; 11) Water whitening resistance, use a 200um molder to make a mold on the glass plate, put it in a 50℃ oven for 2 hours after the surface is dry, take it out and place it at room temperature for 2 hours, soak it in water for 4 hours and take it out, record the degree of whitening and recovery time, the degree of whitening can be divided into no whitening, slightly whitening, slightly whitening, whitening, and severe whitening.

[0096] Performance requirements: visually clear without obstruction, showing obvious imitation "jade" effect, construction smoothness ≥ 8.5 points, stable shaping, paint amount ≥ 0.2kg / ㎡ according to the patented construction process, that is, rub ≥ 10 points, 1h rub ≥ 9.5 points, 24h rub ≥ 9 points, paint film touch ≥ 8.5 points, low-temperature film formation 600um passed, -7℃ freeze-thaw 3 cycles without abnormalities, soaked in water for 4 hours without whitening.

[0097] The test results of each case are shown in Table 2 and Table 3.

[0098] Table 2 Performance test results of Examples 1 to 6

[0099]

[0100] Table 3 Performance test results of Comparative Examples 1 to 7

[0101]

[0102] From Table 1 and Table 2, we can see that:

[0103] 1) From the comparison of the conclusions of Examples 1 to 6, it can be seen that the optimal particle size of sand flour is 5-10 μm, and the optimal dosage is 25-30 parts by weight.

[0104] 2) It can be seen from Example 1 and Comparative Examples 1 and 2 that when RS-8760 emulsion is used to replace sandpaper in an equal amount, when the construction process of this patent is used, the amount of paint applied is low, and 3-4 times of construction are required, which does not meet the simplicity of construction required by this patent, and the pencil hardness of the paint film is poor. Comparative Example 1 is only 2B, while Example 1 can reach 1H, indicating that the use of sandpaper is of great help to the scratch resistance and hardness of the paint film. It also shows that within a certain range, as the amount of sandpaper increases, its hardness increases, and its dynamic friction coefficient decreases, but its polishing time will be relatively extended.

[0105] 3) As can be seen from Example 1 and Comparative Example 3, when the amount of sand powder exceeds a certain amount, the emulsion cannot completely wrap the sand powder during the film-forming process, resulting in a slightly blurred paint film. The interior and surface of the paint film are filled with many tiny pores, resulting in poor watercolor pen resistance, lower gloss, prolonged polishing time, and whitening after soaking in water.

[0106] 4) It can be seen from Example 1 and Comparative Example 4 that when the particle size of the sand powder is too large, the protrusions on the paint film surface are larger and higher, requiring a thicker grinding thickness, a longer polishing time, and a relatively thinner paint film thickness after polishing.

[0107] 5) It can be seen from Example 1 and Comparative Example 5 that when the consistency is too high, the construction resistance is large and the smoothness becomes poor.

[0108] 6) As can be seen from Example 1 and Comparative Example 6, when the sand flour is placed before the thickener is added, the sand flour agglomerates and cannot be dispersed. This may be because the sand flour undergoes irreversible agglomeration under low shear viscosity, and even if the thickener is added later, it cannot be dispersed.

[0109] 7) As can be seen from Example 1 and Comparative Example 7, the sand flour that is not hydrophilically modified cannot be dispersed and cannot be stable in an aqueous system.

[0110] Various embodiments of the present invention may be presented in the form of a range; it should be understood that the description in a range format is merely for convenience and brevity and should not be construed as an inflexible limitation on the scope of the invention; therefore, the range description should be considered to have specifically disclosed all possible subranges and individual numerical values ​​within the range. For example, the description of a range from 1 to 6 should be considered to have specifically disclosed subranges such as from 1 to 3, from 1 to 4, from 1 to 5, from 2 to 4, from 2 to 6, from 3 to 6, etc., as well as individual numbers within the range, such as 1, 2, 3, 4, 5, and 6, regardless of the range. In addition, whenever a numerical range is indicated herein, it is intended to include any cited numeral (fractional or integer) within the indicated range.

[0111] In the present invention, unless otherwise indicated, directional terms such as "upper" and "lower" refer specifically to the directions of the drawings in the accompanying drawings. Additionally, in the description of the present invention, the terms "include," "comprising," and the like mean "including but not limited to." In this document, relational terms such as "first" and "second" are used solely to distinguish one entity or operation from another, and do not necessarily require or imply any actual relationship or order between these entities or operations. As used herein, "and / or" describes an association between associated objects, indicating that three possible relationships exist. For example, "A and / or B" can mean: A exists alone, A and B exist simultaneously, or B exists alone. A and B can be singular or plural. As used herein, "at least one" means one or more, and "plurality" means two or more. "At least one," "at least one of the following," or similar expressions refer to any combination of these items, including any combination of singular or plural items. For example, "at least one of a, b, or c" or "at least one of a, b and c" can mean: a, b, c, a~b (i.e. a and b), a~c, b~c or a~b~c, where a, b, c can be single or multiple.

[0112] The foregoing description is intended only to provide specific embodiments of the present invention, which will enable those skilled in the art to understand and implement the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not intended to be limited to the embodiments shown herein, but is intended to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. An aurora topcoat varnish, characterized in that: The Aurora finish varnish comprises the following raw materials in parts by weight: 65-75 parts of emulsion, 25-35 parts of sand flour, 0.5-0.7 parts of first thickener, 0.5-0.7 parts of second thickener and 1.5-3.0 parts of film-forming aid; The glass transition temperature of the emulsion is ≥20°C, the particle size of the sand flour is 5-10 μm, the first thickener is a polyurethane medium shear thickener, and the second thickener is a polyurethane high shear thickener; The sand flour is composed of sand flour with a particle size of 5 μm; or, the sand flour is composed of sand flour with a particle size of 5 μm and sand flour with a particle size of 10 μm in a weight ratio of 15:10; or, the sand flour is composed of sand flour with a particle size of 5 μm and sand flour with a particle size of 10 μm in a weight ratio of 15:15; or, the sand flour is composed of sand flour with a particle size of 10 μm; The preparation method of the aurora cover varnish comprises the following steps: The emulsion, antifreeze agent, defoaming agent and film-forming aid are first stirred and mixed to obtain a first mixture; adding a first thickener, a second thickener and the hydrophilically modified sand flour to the first mixture in sequence and performing a second stirring and mixing process to obtain a second mixture; Add a fungicide and a preservative to the second mixture and perform a third stirring and mixing to obtain the Aurora topcoat varnish.

2. The aurora finish varnish according to claim 1, characterized in that: In parts by weight, the aurora topcoat varnish further comprises: 0.5-1.5 parts of antifreeze agent and 0.1-0.3 parts of defoaming agent.

3. The aurora finish varnish according to claim 2, characterized in that: The antifreeze agent is an alcohol antifreeze agent, the defoamer is a mineral oil defoamer, and the thickening shear rate of the shear thickener in the polyurethane is 10-100s -1 The thickening shear rate of the polyurethane high shear thickener is 100~10000s -1 , the glass transition temperature of the emulsion is 20~40°C.

4. The aurora finish varnish according to claim 1 or 2, characterized in that: The film-forming aid includes at least one of an alcohol ester film-forming aid and a mixed ester film-forming aid.

5. The aurora finish varnish according to claim 1 or 2, characterized in that: The Aurora finish varnish comprises the following raw materials in parts by weight: 70.95 parts of emulsion, 25 parts of sand flour, 0.5 parts of a first thickener, 0.5 parts of a second thickener, 1.5 parts of a film-forming aid, 0.8 parts of an antifreeze agent, 0.3 parts of a defoaming agent, 0.25 parts of a fungicide, and 0.2 parts of a preservative; Wherein, the sand flour is composed of sand flour with a particle size of 5 μm; or, The sand flour is composed of sand flour with a particle size of 5 μm and sand flour with a particle size of 10 μm in a weight ratio of 15:10; or, The sand flour is composed of sand flour with a particle size of 10 μm.

6. The aurora finish varnish according to claim 1 or 2, characterized in that: The Aurora finish varnish comprises the following raw materials in parts by weight: 65.95 parts of emulsion, 30 parts of sand flour, 0.5 parts of a first thickener, 0.5 parts of a second thickener, 1.5 parts of a film-forming aid, 0.8 parts of an antifreeze agent, 0.3 parts of a defoaming agent, 0.25 parts of a fungicide, and 0.2 parts of a preservative; Wherein, the sand flour is composed of sand flour with a particle size of 5 μm; or, The sand flour is composed of sand flour with a particle size of 5 μm and sand flour with a particle size of 10 μm in a weight ratio of 15:

15.

7. The aurora finish varnish according to claim 1 or 2, characterized in that: The Aurora finish varnish comprises the following raw materials in parts by weight: 65.75 parts of emulsion, 30 parts of sand flour, 0.6 parts of a first thickener, 0.6 parts of a second thickener, 1.5 parts of a film-forming aid, 0.8 parts of an antifreeze agent, 0.3 parts of a defoaming agent, 0.25 parts of a fungicide and 0.2 parts of a preservative.

8. The aurora finish varnish according to claim 1, characterized in that: The first stirring and mixing working parameters include: a stirring speed of 250-350 r / min and a stirring time of 2-5 minutes.

9. The aurora finish varnish according to claim 1, characterized in that: The working parameters of the second stirring and mixing include: a stirring speed of 800-1000 r / min, and a time of 15-25 minutes; the working parameters of the third stirring and mixing include: a stirring speed of 750-850 r / min, and a time of 8-15 minutes.

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