A water-based topcoat and a method for preparing the same

Abstract

The present application relates to a kind of water-based finish and its preparation method, the water-based finish includes A component and B component, the A component includes the following mass percentage content of raw material component: water, 20~40wt%, wetting dispersion aid, 0.5~5wt%, antifoaming agent, 0.5~1.5wt%, attapulgite, 5~15wt%, bentonite, 3~5wt%, film forming aid, 3~12wt%, hydroxy acrylate emulsion, 30~55wt%, toner, 5~10wt%, acid, 0.1~2wt%;The B component is curing agent component.The water-based finish prepared by the present application has no traditional ammonia type irritating smell, has long operation period after compounding, can be quickly cured into film at room temperature, surface is dense, and good dirt resistance effect is good.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of coatings, and particularly relates to a water-based finish and a preparation method thereof. BACKGROUND

[0002] With the development of science and technology and the improvement of living standards, people's environmental protection consciousness is increasingly strong. Traditional oil-based paint contains solvent in the preparation process, which can cause certain harm to the human body and the environment during production and construction. To solve this problem, water-based paint is produced, which uses water as a solvent and has good environmental protection. Color finish not only protects the substrate, but also brings people the visual enjoyment of beauty. After several years of development, the formula of water-based finish has gradually improved, but there are still some problems such as poor water resistance, low surface strength, and easy staining.

[0003] At present, the water-based color finish matched with sports grounds is an acrylic composite polyurethane water-based material, which has the aging resistance of acrylic material and the flexibility of polyurethane, and can meet the high color retention and cracking resistance. However, the water-based finish for sports grounds needs to be mixed with quartz sand to improve the anti-skid effect, so such water-based finish needs to have high thixotropy to ensure uniform distribution and no sedimentation and delamination after sanding.

[0004] Patent CN201510184152.6 discloses a dirt-resistant and environmentally friendly water-based finish and a preparation method thereof. The cross-linking degree of the finish is improved by adding a cross-linked hydroxyl acrylic emulsion to achieve a dense surface structure and improve the dirt resistance. A small molecule ammonia compound is used to adjust the system PH to weak alkalinity, and a thickening agent is used to obtain high thixotropy. Increasing the cross-linking degree can increase the conventional hardness, but too high cross-linking degree can easily cause the film to become brittle, and the ammonia additive has a strong irritating odor even in a small amount.

[0005] Patent CN202211561414.2 discloses a water-based finish for high-wear plastic ball courts and a preparation method thereof. The wear resistance is improved by compounding hydroxyl acrylic emulsion with water-based polyurethane emulsion. The thixotropy is achieved by the cooperation of a small molecule ammonia compound and a thickening agent. This method does not specifically study the dirt resistance, and the ammonia additive has a strong irritating odor.

[0006] In the prior art, a small molecule ammonia is used to adjust the PH to weak alkalinity, and a thickening agent is used to produce a network structure thixotropy. This not only makes the finish product have an ammonia irritating odor, but also causes an alkaline catalytic reaction, resulting in a rapid reaction of the material and the curing agent after compounding, insufficient operation period, and a loss of operability within 1-2 hours of use on the site, which can also cause rapid curing during the rolling process and produce roller marks affecting the appearance.

[0007] Color topcoat is mostly used in indoor and outdoor large-scale activity field, and its color retention and odor are important indexes. Therefore, it is necessary to provide a topcoat with low odor and excellent roll coating effect. SUMMARY

[0008] The present application provides a water-based topcoat with no irritating ammonia odor and good construction effect and a preparation method thereof.

[0009] To achieve the above-mentioned purpose, the present application provides the following technical solutions.

[0010] A water-based topcoat comprises A component and B component, the A component comprises the following raw material components in mass percentage:

[0011] water, 20-40wt%, wet dispersing aid, 0.5-5wt%, defoaming agent, 0.5-1.5wt%, attapulgite, 5-15wt%, bentonite, 1-5wt%, film forming aid, 3-12wt%, hydroxyl acrylic acid emulsion, 30-55wt%, color powder, 5-10wt%, acid, 0.1-2wt%;

[0012] The total mass of the A component is 100%.

[0013] The B component is a curing agent component.

[0014] Preferably, the mass percentage of the acid is 0.5-1.2wt%.

[0015] The addition amount of the B component is 4-18wt% of the mass of the A component, preferably 5-10wt%. On the basis of the above technical solutions, the above technical solutions can be improved as follows:

[0016] Further, the water is distilled water or deionized water.

[0017] Further, the wet dispersing aid is one or more of anionic surfactants such as sodium oleate, carboxylate, sulfate (R-O-SO3Na), sulfonate (R-SO3Na) or alkyl phenol polyoxyethylene ether.

[0018] Further, the defoaming agent is a mineral oil type defoaming agent.

[0019] Further, the attapulgite is 300-500 mesh.

[0020] Further, the film forming aid is a diethylene glycol ether type film forming agent (such as diethylene glycol butyl ether), a propylene glycol ether type film forming agent and N-methyl pyrrolidone or alcohol ester twelve.

[0021] Further, the hydroxyl acrylic emulsion comprises bifunctional hydroxyl acrylic acid and trifunctional hydroxyl acrylic acid, and the mass ratio of the bifunctional hydroxyl acrylic acid to the trifunctional hydroxyl acrylic acid is (2-3) / 1, and the glass transition temperature of the hydroxyl acrylic emulsion is above 40℃.

[0022] Further, the bentonite has a particle size of 60-80μm.

[0023] Further, the acid is an acid with an acidity dissociation constant lower than 1.0×10 -3 The acid with an acidity dissociation constant lower than 1.0×10

[0024] Further, the toner is one or more of iron red, iron green, iron yellow, phthalocyanine blue, big red, lightfast yellow, phthalocyanine green, and titanium white.

[0025] Further, the curing agent is an HDI polymer curing agent, preferably an HDI trimer or HDI uretdione curing agent.

[0026] The application also provides a preparation method of the water-based finish, wherein the water-based finish is obtained by mixing the prepared A component and B component, and the preparation method of the A component comprises the following steps:

[0027] (1) adding water, defoaming agent, wetting and dispersing aid, and weak acid into a reaction device, and preliminarily stirring and dispersing, and then adding attapulgite and toner to continue stirring and dispersing,

[0028] Further, the stirring speed of the preliminary stirring and dispersing is 500-800r / min, and the dispersing time is 5-20min; and after the attapulgite and toner are added, the stirring speed is 1500-2200r / min, and the dispersing time is 0.5-3h.

[0029] (2) adding hydroxyl acrylic emulsion and film-forming aid to continue dispersing, and preferably, the dispersing time is 15-45min;

[0030] Preferably, the stirring speed in step (2) is 900-1100r / min.

[0031] (3) adding bentonite to continue dispersing, and discharging;

[0032] Preferably, the dispersing time in step (3) is 20-30min.

[0033] The application also provides the use of the water-based finish, which is used for sports grounds.

[0034] A water-based finish for sports ground, comprising 55-82 wt% of the water-based finish according to the present application, 5-15 wt% of quartz sand, 5-10 wt% of curing agent, and 8-20 wt% of water.

[0035] In use, the above raw materials are mixed and stirred uniformly, and then rolled or sprayed on the ground.

[0036] In some preferred embodiments of the present application, the water-based finish for sports ground reaches surface dryness within 5-20 minutes, and completes curing within 8-12 hours, thereby achieving the effect of water and dirt resistance.

[0037] The environmentally friendly water-based color finish for sports ground needs to have high yellowing resistance, and at the same time needs to have certain flexibility and elasticity to be combined with the ground without cracking, the hydroxyl acrylic emulsion with dual functionality and triple functionality is selected in the present application and compounded in a certain ratio, the compounding ratio is (2-3) / 1, the suitable flexibility and crosslinking degree can be obtained, the combination with the elastic base without cracking is ensured, and the crosslinking structure is provided to provide water resistance and dense surface; the glass transition temperature of the hydroxyl acrylic emulsion is above 40℃, the surface of the paint film is ensured to be dry and not sticky at normal temperature, dust contamination in the environment is avoided, and the dirt resistance effect is effectively improved; the attapulgite and bentonite are used in combination and added to the matrix, the two have high thixotropy effect, the required thixotropy effect can be obtained by adding the water dispersion, the small molecule ammonia compound does not need to be added, the irritating odor in the system is eliminated, and the low odor effect is achieved; the finish emulsion in the field is usually weakly alkaline, the weak acid end-capping is used in the preparation of the emulsion in the present application, the ionization in water is used, the reaction of the finish and the curing agent is inhibited after mixing, the material that has not been constructed in the bucket is ensured to remain liquid and operable, as long as the water in the system is not completely volatilized, the reaction can be effectively inhibited, and the water needs a certain time to volatilize after being rolled on the base, during which the finish can effectively flow flat. DETAILED DESCRIPTION

[0038] The specific embodiments of the present application are further described below in conjunction with specific examples. The following examples are only used to more specifically and in detail illustrate the present application, and cannot limit the protection scope of the present application.

[0039] The present application provides a low-odor water-based finish, and the specific embodiments are as follows:

[0040] <Raw material source>

[0041] Acrylic copolymer emulsion, functionality 2, glass transition temperature 45℃, model 0676, Wanhua Chemical;

[0042] Acrylic copolymer emulsion, functionality 3, glass transition temperature 41℃, model 4708, Wanhua Chemical;

[0043] Acrylic copolymer emulsion, functionality 3, glass transition temperature 45℃, grade 4703, Wanhua Chemical;

[0044] Curing agent, grade Aquolin 278A, Wanhua Chemical;

[0045] Curing agent, grade Aquolin 161, Wanhua Chemical

[0046] Palygorskite, mesh 325, Mingmei Mineral Chemical Co., Ltd.;

[0047] Bentonite, grade NW-12, Fengxing Chemical Trade Co., Ltd.;

[0048] Wetting dispersant, grade Silok 7073, Guangzhou Silok;

[0049] Defoaming agent, grade Silok 066N, Guangzhou Silok;

[0050] Film-forming aid alcohol ester twelve, Guda Chemical;

[0051] Other components involved in the examples and comparative examples are conventional raw materials and commercially available, which are not described here.

[0052] Example 1

[0053] A reaction device with dispersion grinding function was used, 30wt% water, 1.3wt% wetting dispersant 7073, 1wt% defoaming agent 066N, and 0.5wt% phosphoric acid were added to the reaction device, stirring was started, the speed was set to 800r / min, 12wt% palygorskite, 7wt% iron red, and 1wt% titanium white powder were added after 5 minutes of dispersion, high-speed stirring was started, the speed was 2000r / min, and dispersion was carried out for 1h;

[0054] The speed was adjusted to 1000r / min, 25wt% hydroxy acrylic emulsion 0676, 12.7wt% hydroxy acrylic emulsion 4073, and 6wt% film-forming aid alcohol ester twelve were added, and dispersion was continued for 30min;

[0055] 3.5wt% bentonite was added, and dispersion was continued for 30min, and the water-based color finish A component 1 was discharged.

[0056] The water-based color finish A component 1 prepared as above was used to prepare a synthetic material sports surface, and the specific steps were as follows:

[0057] Weigh 60 g of the prepared water-based color finish A component 1 into a stirring cup, pour 4 g of Aquolin 278A into the stirring cup, add 6 g of water, 3 g of quartz sand, and mix uniformly under stirring; observe whether the quartz sand has settled after half an hour of placement, and roll coat the stirred material on a plastic base at a roll coating amount of 0.2 kg / m 2 Curing is completed after 8 h at room temperature.

[0058] Example 2

[0059] A reaction device with dispersion and grinding functions is used, 31.3 wt% of water, 1.2 wt% of wet dispersant 7073, 1 wt% of defoaming agent 066N, and 0.5 wt% of tartaric acid are added into the reaction device, stirring is started with a rotation speed of 800 r / min, 15 wt% of attapulgite, 7 wt% of iron red, and 1 wt% of titanium white are added after 5 min of dispersion, high-speed stirring is started with a rotation speed of 2000 r / min, and dispersion is performed for 1 h.

[0060] The rotation speed is adjusted to 1000 r / min, 26 wt% of hydroxyl acrylate emulsion 0676, 8 wt% of hydroxyl acrylate emulsion 4073, and 5 wt% of film-forming aid alcohol ester twelve are added, and dispersion is continuously performed for 30 min.

[0061] 4 wt% of bentonite is added, and dispersion is continuously performed for 30 min, and water-based color finish A component 2 is obtained through discharging.

[0062] The water-based color finish A component 2 prepared as above is used to prepare a synthetic material sports surface layer, and the specific steps are as follows:

[0063] Weigh 64 g of the prepared water-based color finish A component 2 into a stirring cup, pour 4 g of curing agent Aquolin 161 into the stirring cup, add 7 g of water, 3 g of quartz sand, and mix uniformly under stirring; observe whether the quartz sand has settled after half an hour of placement, and roll coat the stirred material on a plastic base at a roll coating amount of 0.2 kg / m 2 Curing is completed after 8 h at room temperature.

[0064] Example 3

[0065] A reaction device with dispersion and grinding functions is used, 33.7 wt% of water, 1.3 wt% of wet dispersant 7073, 1 wt% of defoaming agent 066N, and 1.0 wt% of salicylic acid are added into the reaction device, stirring is started with a rotation speed of 800 r / min, 13 wt% of attapulgite, 7 wt% of iron red, and 1 wt% of titanium white are added after 5 min of dispersion, high-speed stirring is started with a rotation speed of 2000 r / min, and dispersion is performed for 1 h.

[0066] The rotation speed was adjusted to 1000 r / min, 24 wt% hydroxyl acrylic emulsion 0676, 9 wt% hydroxyl acrylic emulsion 4078, and 6 wt% film forming aid alcohol ester twelve were added, and the dispersion was continued for 30 min.

[0067] 3 wt% bentonite was added, and the dispersion was continued for 30 min. The water-based color topcoat A component 3 was obtained by discharging.

[0068] The water-based color topcoat A component 3 prepared above was used to prepare a synthetic material sports surface, and the specific steps were as follows:

[0069] 68 g of the prepared water-based color topcoat A component 3 was weighed into a stirring cup, 4 g of the curing agent Aquolin 278A was poured into the stirring cup, 7 g of water and 4 g of quartz sand were added, and the mixture was uniformly mixed under stirring. After standing for half an hour, it was observed whether the quartz sand had settled. The stirred material was roll-coated on a plastic base at a roll-coating amount of 0.2 kg / m 2 The curing was completed after 8 h at room temperature.

[0070] Example 4

[0071] A reaction device with dispersion and grinding functions was used. 30.3 wt% water, 1.5 wt% wetting dispersant 7073, 1 wt% defoamer 066N, and 1.5 wt% tartaric acid were added to the reaction device. The stirring was started, the rotation speed was set to 800 r / min, 13 wt% attapulgite, 6 wt% iron red, and 2 wt% titanium white were added after 5 min of dispersion, the high-speed stirring was started, and the rotation speed was set to 2000 r / min. The dispersion was continued for 1 h.

[0072] The rotation speed was adjusted to 1000 r / min, 25.7 wt% hydroxyl acrylic emulsion 0676, 10 wt% hydroxyl acrylic emulsion 4073, and 5 wt% film forming aid alcohol ester twelve were added, and the dispersion was continued for 30 min.

[0073] 4 wt% bentonite was added, and the dispersion was continued for 30 min. The water-based color topcoat A component 4 was obtained by discharging.

[0074] The water-based color topcoat A component 4 prepared above was used to prepare a synthetic material sports surface, and the specific steps were as follows:

[0075] 64 g of the prepared water-based color topcoat A component 4 was weighed into a stirring cup, 4 g of the curing agent Aquolin 278A was poured into the stirring cup, 7 g of water and 3 g of quartz sand were added, and the mixture was uniformly mixed under stirring. After standing for half an hour, it was observed whether the quartz sand had settled. The stirred material was roll-coated on a plastic base at a roll-coating amount of 0.2 kg / m 2 The curing was completed after 8 h at room temperature.

[0076] Comparative Example 1

[0077] Using a reaction device with dispersion grinding function, 30wt% water, 1.3wt% wet dispersant 7073, 1wt% defoamer 066N, 0.5wt% phosphoric acid were added in the reaction device, stirring was started, the speed was set to 800r / min, 12wt% attapulgite, 7wt% iron red, 1wt% titanium dioxide were added after 5 minutes of dispersion, high-speed stirring was started, the speed was 2000r / min, and dispersion was carried out for 1h;

[0078] The speed was adjusted to 1000r / min, 25wt% hydroxyl acrylic emulsion WPB2525

[0079] (Tg=25℃, functionality is 2), 12.7wt% hydroxyl acrylic emulsion 9810 (Tg=28℃, functionality is 3), 6wt% film forming aid alcohol ester twelve, and dispersion was continued for 30min;

[0080] 3.5wt% bentonite was added, dispersion was continued for 30min, and the water-based color finish A component 1' was obtained by discharging.

[0081] The water-based color finish A component 1' prepared above was used to prepare a synthetic material sports surface, and the specific steps were as follows:

[0082] 60g of the prepared water-based color finish A component 1' was weighed into a stirring cup, 4g of curing agent Aquolin 278A was poured into the stirring cup, 6g of water, 3g of quartz sand were added, and they were mixed uniformly under stirring; after half an hour, it was observed whether the quartz sand had settled, and the stirred material was roll-coated on the plastic base at a roll-coating amount of 0.2kg / m 2 , and curing was completed after 8h at room temperature.

[0083] Comparative Example 2

[0084] Using a reaction device with dispersion grinding function, 31.3wt% water, 1.2wt% wet dispersant 7073, 1wt% defoamer 066N, 0.5wt% tartaric acid were added in the reaction device, stirring was started, the speed was set to 800r / min, 15wt% attapulgite, 7wt% iron red, 1wt% titanium dioxide were added after 5 minutes of dispersion, high-speed stirring was started, the speed was 2000r / min, and dispersion was carried out for 1h;

[0085] The speed was adjusted to 1000r / min, 34wt% hydroxyl acrylic emulsion 9810 (Tg=28℃, functionality is 3), 5wt% film forming aid alcohol ester twelve were added, and dispersion was continued for 30min;

[0086] 4wt% bentonite was added, dispersion was continued for 30min, and the water-based color finish A component 2' was obtained by discharging.

[0087] The synthetic material sports surface layer was prepared using the water-based color finish A component 2' prepared above, and the specific steps were as follows:

[0088] The 64 g of the prepared water-based color finish A component 2' was weighed into a stirring cup, 4 g of the curing agent Aquolin 161 was poured into the stirring cup, 7 g of water and 3 g of quartz sand were added, and they were mixed uniformly under stirring. After being placed for half an hour to observe whether the quartz sand was settled, the stirred material was roll-coated on the plastic base at a roll-coating amount of 0.2 kg / m 2 , and the curing was completed after 8 hours at room temperature.

[0089] Comparative Example 3

[0090] The reaction device with a dispersion and grinding function was used, 33.7 wt% of water, 1.3 wt% of the wet dispersant 7073, 1 wt% of the defoaming agent 066N, and 1.0 wt% of salicylic acid were added into the reaction device, stirring was started, the rotating speed was set to 800 r / min, 16 wt% of calcined kaolin, 7 wt% of iron red, and 1 wt% of titanium white powder were added after 5 minutes of dispersion, high-speed stirring was started, the rotating speed was 2000 r / min, and the dispersion was carried out for 1 hour.

[0091] The rotating speed was adjusted to 1000 r / min, 24 wt% of the hydroxyl acrylic emulsion 0676, 9 wt% of the hydroxyl acrylic emulsion 4078, and 6 wt% of the film-forming aid alcohol ester twelve were added, the dispersion was continued for 30 minutes, and the water-based color finish A component 3' was obtained.

[0092] The synthetic material sports surface layer was prepared using the water-based color finish A component 3' prepared above, and the specific steps were as follows:

[0093] The 68 g of the prepared water-based color finish A component 3' was weighed into a stirring cup, 4 g of the curing agent Aquolin 278A was poured into the stirring cup, 7 g of water and 4 g of quartz sand were added, and they were mixed uniformly under stirring. After being placed for half an hour to observe whether the quartz sand was settled, the stirred material was roll-coated on the plastic base at a roll-coating amount of 0.2 kg / m 2 , and the curing was completed after 8 hours at room temperature.

[0094] Comparative Example 4

[0095] The reaction device with a dispersion and grinding function was used, 31.8 wt% of water, 1.5 wt% of the wet dispersant 7073, and 1 wt% of the defoaming agent 066N were added into the reaction device, stirring was started, the rotating speed was set to 800 r / min, 13 wt% of attapulgite, 6 wt% of iron red, and 2 wt% of titanium white powder were added after 5 minutes of dispersion, high-speed stirring was started, the rotating speed was 2000 r / min, and the dispersion was carried out for 1 hour.

[0096] The rotation speed was adjusted to 1000 r / min, 25.7 wt% hydroxyl acrylic emulsion 0676, 10 wt% hydroxyl acrylic emulsion 4073, and 5 wt% film forming aid alcohol ester twelve were added, and the dispersion was continued for 30 min;

[0097] 4 wt% bentonite was added, and the dispersion was continued for 30 min, and the water-based color topcoat A component 4' was obtained by discharging.

[0098] The water-based color topcoat A component 4' prepared as above was used to prepare a synthetic material sports surface, and the specific steps were as follows:

[0099] 64 g of the prepared water-based color topcoat A component 4' was weighed into a stirring cup, 4 g of the curing agent Aquolin 278A was poured into the stirring cup, 7 g of water and 3 g of quartz sand were added, and they were mixed uniformly under stirring; after half an hour, it was observed whether the quartz sand had settled, and the stirred material was roll-coated on the plastic base at a roll-coating amount of 0.2 kg / m 2 , and the curing was completed after 8 h at room temperature.

[0100] Performance test method:

[0101] 1. Storage state: good if no water separation on the surface and no sedimentation at the bottom after 3 months at room temperature, general if water separation but no sedimentation, and poor if sedimentation.

[0102] 2. Sand holding effect: 10% water and 10% 100-mesh quartz sand were added and stirred uniformly, and then left to stand for 30 min; good if the quartz sand did not settle, and poor if the quartz sand settled.

[0103] 3. Dirt resistance: 10 g of 400-mesh talcum powder was mixed with 100 g of water and applied to the paint surface after the topcoat was cured for 24 h, and then the paint surface was washed with naturally flowing water for 2 min after 8 h; excellent if there was basically no residue, good if there was a small amount of residue, and poor if there was a large amount of residue.

[0104] 4. Water resistance: the topcoat was applied to a polyurethane elastic layer sample, the paint film was naturally cured for 24 h, and then immersed in water for 7 days; poor if the paint film blistered and peeled off, general if the paint film faded, and excellent if the paint film was intact.

[0105] 5. Effective period after mixing: the topcoat and the curing agent were mixed uniformly according to the proportion, and the timer was started, and then placed in a 30℃ oven until the mixture was caked, and then the timer was stopped.

[0106] 6. Roll-coating effect: the topcoat was roll-coated on a 60℃ interface; poor if there were obvious roll marks, general if there were light roll marks, and good if there were no obvious roll marks.

[0107] Table 1: Properties of the topcoat prepared in each example

[0108]

[0109] The properties of the topcoat prepared in each of the comparative examples of Table 2

[0110]

[0111] As can be seen from the comparison of the dirt resistance of Example 1 and Comparative Example 1, replacing the emulsion with a low glass transition temperature, the dirt resistance of the material becomes worse; the system is weakly alkaline, the effective period after mixing is short, and the roll marks after rolling are obvious.

[0112] As can be seen from the comparison of the dirt resistance of Example 2 and Comparative Example 2, using an emulsion with a high crosslinking degree and a low glass transition temperature, the dirt resistance is improved but the effect is limited.

[0113] As can be seen from the comparison of the storage state of Example 3 and Comparative Example 3, using calcined kaolin instead of attapulgite and bentonite, the material has no additional PH adjuster, and cannot complex the thickening agent to achieve the thixotropic effect.

[0114] As can be seen from the comparison of the operability of Example 4 and Comparative Example 4, without small molecule weak acid capping, even if there is no PH adjuster in the system, the material will react quickly after mixing.

[0115] The data of the present example show that this scheme can solve the problem of surface contamination of water-based color topcoat, and also avoid the use of ammonia PH adjuster, reduce the odor, and achieve the effect of low odor, dirt resistance and long effective period.

[0116] The above is only a preferred embodiment of the present application, and is not intended to limit the other forms of the present application. Any person skilled in the art can use the disclosed technical content to make changes or modifications to equivalent embodiments. However, any simple modification, equivalent change and modification made according to the technical essence of the present application to the above embodiments, without departing from the technical solution content of the present application, still falls within the protection scope of the present application.

Claims

1. An aqueous topcoat characterized in that, comprising an A component and a B component, the A component comprising raw material components in the following mass percentages: water, 20-40wt%, wetting and dispersing aid, 0.5-5wt%, antifoaming agent, 0.5-1.5wt%, attapulgite, 5-15wt%, bentonite, 1-5wt%, film forming aid, 3-12wt%, hydroxyl acrylic emulsion, 30-55wt%, color powder, 5-10wt%, acid, 0.1-2wt%; the total mass of the A component being 100%; the B component being a curing agent component; the hydroxyl acrylic emulsion comprising a bifunctional hydroxyl acrylic emulsion and a trifunctional hydroxyl acrylic emulsion, the mass ratio of the bifunctional hydroxyl acrylic emulsion to the trifunctional hydroxyl acrylic emulsion being (2-3) / 1, and the glass transition temperature of the hydroxyl acrylic emulsion being above 40℃; the acid comprising one or more of phosphoric acid, oxalic acid, formic acid, acetic acid, and C3-C8 hydroxyl carboxylic acid.

2. The aqueous topcoat of claim 1, characterized in that, The mass percentage of the acid is 0.5-1.2wt%.

3. The aqueous topcoat of claim 1, wherein, The amount of the B component added is 4-18wt% of the mass of the A component.

4. The aqueous topcoat of claim 3, wherein, The amount of the B component added is 5-10wt% of the mass of the A component.

5. The aqueous topcoat of claim 1 or 2, characterized in that, The wetting and dispersing aid is an anionic surfactant.

6. The aqueous topcoat of claim 5, wherein, The wetting and dispersing aid is one or more of sodium oleate, carboxylate, sulfate, or sulfonate.

7. The aqueous topcoat of claim 1, wherein, The antifoaming agent is a mineral oil-based antifoaming agent.

8. The aqueous topcoat of claim 1, wherein, The attapulgite is 300-500 mesh.

9. The aqueous topcoat of claim 1, wherein, The film forming aid is a diethylene glycol ether-based film forming agent, a propylene glycol ether-based film forming agent, or N-methyl pyrrolidone or alcohol ester twelve.

10. The aqueous topcoat of claim 1, wherein, The bentonite has a particle size of 60-80μm.

11. The aqueous topcoat of claim 1, wherein, The color powder is one or more of iron red, iron green, iron yellow, phthalocyanine blue, large red, light fast yellow, phthalocyanine green, and titanium white powder.

12. The aqueous topcoat of claim 1, wherein, The acid is a C3-C8 hydroxyl carboxylic acid.

13. The aqueous topcoat of claim 12, wherein, The acid is lactic acid, tartaric acid, or salicylic acid.

14. The aqueous topcoat of claim 1, wherein, The curing agent component is an HDI polymer curing agent.

15. The aqueous topcoat of claim 14, wherein, The curing agent component is an HDI trimer or HDI uretdione curing agent.

16. A method for preparing the water-based finish according to any one of claims 1-15, wherein the prepared A component and the B component are mixed to obtain the water-based finish, and the method for preparing the A component comprises the following steps: (1) adding water, antifoaming agent, wetting and dispersing aid, and acid into a reaction device, and initially stirring and dispersing, then adding attapulgite and color powder and continuing to stir and disperse, (2) adding hydroxyl acrylic emulsion and film forming aid and continuing to stir and disperse, and (3) adding bentonite and continuing to disperse, and discharging.

17. The method of claim 16, wherein, In step (2), the dispersing time is 15-45min.

18. The method of claim 16, wherein, In step (1), the stirring speed for the initial stirring and dispersing is 500-800r / min, and the dispersing time is 5-20min; after adding the attapulgite and color powder, the stirring speed is 1500-2200r / min, and the dispersing time is 0.5-3h.

19. The method of claim 16, wherein, In step (2), the stirring speed is 900-1100r / min.

20. The method of claim 16, wherein, In step (3), the dispersing time is 20-30min.

21. Use of the water-based finish according to any one of claims 1-15 or prepared by the method according to any one of claims 16-20 in sports grounds.

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