Sulfur-rich polymers, methods for their preparation, compositions for waterproofing coatings, waterproofing coatings, methods for their preparation and use

Abstract

The present application relates to the field of waterproof coating, and discloses a sulfur-rich polymer, a preparation method of the sulfur-rich polymer, a composition for waterproof coating, a waterproof coating, a preparation method and application of the waterproof coating.The preparation method of the sulfur-rich polymer comprises the following steps: S1, reacting sulfur, itaconic acid and dimethylaminopropyl methacrylamide in the presence of a protective gas and a catalyst to obtain an intermediate product; S2, drying the intermediate product to obtain the sulfur-rich polymer; the mass ratio of the sulfur, the itaconic acid and the dimethylaminopropyl methacrylamide is 1:0.8-1.2:2.0-3.2.The waterproof coating prepared from the sulfur-rich polymer can solve the problems of poor bonding performance, mechanical strength and aging resistance of the existing functional waterproof coating, and effectively improves the blistering and bulging phenomenon of roof waterproofing.

Description

Technical Field

[0001] This invention relates to the field of waterproof coating technology, specifically to a sulfur-rich polymer and its preparation method, a composition for waterproof coating, a waterproof coating and its preparation method, and its application. Background Technology

[0002] The market demand for multifunctional coatings is gradually increasing, leading to the rapid development of various multifunctional coatings such as rust-proof waterproof coatings, aging-resistant waterproof coatings, sound-insulating waterproof coatings, and flame-retardant waterproof coatings.

[0003] However, while existing waterproofing materials offer increased functionality, their fundamental properties, such as adhesion and durability, tend to decline. The coating is easily damaged by external environmental impacts and friction during use. Over time, this damage leads to increasingly larger cracks or openings in the coating layer, ultimately causing waterproofing failure. Currently, we urgently need a functional coating that not only ensures good adhesion for tight bonding but also possesses excellent mechanical strength to resist external forces. Furthermore, it should be able to self-repair even under prolonged exposure to maintain good adhesion to the substrate, thus meeting complex waterproofing requirements.

[0004] For example, CN111574126A discloses a self-healing polymer cement waterproof coating and its preparation method. The waterproof coating consists of a liquid and a powder, with the liquid containing a self-healing core-shell capsule. The capsule's shell is resin, and the core is composed of sodium alginate, polyoxyethylene octadecylamine, superhydrophobic silica aerogel powder, and water. When fine cracks appear in the coating, the capsule's shell ruptures, allowing the sodium alginate to contact the calcium hydroxide produced by cement hydration, thus promoting the formation of a self-healing core-shell capsule. 2+ Cross-linking occurs under the action of [the substance], forming a three-dimensional network to seal the cracks. Although this solution has a self-healing effect, its principle is based on the action of microcapsules and the substances they encapsulate. The self-healing function of the microcapsules in this solution is one-time use, and if the microcapsule components are too small, the self-healing performance will be weak; if the components are too large, it will affect the material's own strength and bonding strength. Summary of the Invention

[0005] The purpose of this invention is to solve the problems of insufficient initial bonding strength leading to blistering and peeling, as well as low mechanical strength and poor aging resistance of existing functional waterproof coatings.

[0006] To achieve the above objectives, a first aspect of the present invention provides a method for preparing a sulfur-rich polymer, the method comprising:

[0007] S1. In the presence of a protective gas and a catalyst, sulfur, itaconic acid, and dimethylaminopropylmethacrylamide are reacted to obtain an intermediate product; the reaction conditions include: a temperature of 160-180℃ and a time of 2-5 h; the catalyst is zinc diethyldithiocarbamate.

[0008] S2. The intermediate product is dried to obtain the sulfur-rich polymer;

[0009] The mass ratio of the sulfur, the itaconic acid, and the dimethylaminopropylmethacrylamide is 1:0.8-1.2:2.0-3.2.

[0010] The second aspect of the present invention provides a sulfur-rich polymer prepared by the method described in the first aspect.

[0011] A third aspect of the present invention provides a composition for a waterproof coating, the composition comprising a main agent and an auxiliary agent:

[0012] The main agent includes a composite polymer emulsion, filler, and component A; the auxiliary agent includes at least one of thickener, dispersant, and defoamer.

[0013] Based on the total mass of the composition, the composition contains 40-60 wt% of a composite polymer emulsion, 20-35% of filler, 10-30 wt% of component A, and 0.4-11.5 wt% of additives;

[0014] Component A is an ethanol solution of a sulfur-rich polymer with a concentration of 25-40 wt%; the sulfur-rich polymer is the sulfur-rich polymer described in the second aspect.

[0015] The composite polymer emulsion is a combination of silicone-acrylic emulsion and styrene-acrylic emulsion in a mass ratio of 1:2-3.5; the glass transition temperature of the silicone-acrylic emulsion is 19-23℃.

[0016] A fourth aspect of the present invention provides a method for preparing a waterproof coating, the method being carried out using the composition described in the third aspect, comprising:

[0017] (1) A first mixture containing a dispersant, a defoamer and a portion of a composite polymer emulsion is mixed to obtain material I; the first mixture optionally contains water and a preservative;

[0018] (2) The filler and material I are mixed a second time to obtain material II;

[0019] (3) Mix component A, thickener, remaining composite polymer emulsion and material II in a third mixing process to obtain the waterproof coating.

[0020] The fifth aspect of the present invention provides a waterproof coating prepared by the method described in the fourth aspect.

[0021] The sixth aspect of the present invention provides the application of the waterproof coating described in the fifth aspect in the waterproofing of exposed roofs of buildings.

[0022] The waterproof coating prepared using the sulfur-rich polymer provided by this invention effectively solves the problems of poor adhesion and mechanical strength of existing functional waterproof coatings, and effectively improves the phenomenon of easy blistering and bubbling of roof waterproofing.

[0023] Meanwhile, the waterproof coating prepared using the sulfur-rich polymer provided by this invention can self-repair under prolonged sun exposure, and can also effectively avoid the problem of reduced aesthetics and functionality caused by the proliferation of microorganisms on the coating surface due to prolonged rainy weather and high levels of dust in the air. Detailed Implementation

[0024] The endpoints and any values ​​of the ranges disclosed herein are not limited to the precise ranges or values, and these ranges or values ​​should be understood to include values ​​close to these ranges or values. For numerical ranges, the endpoint values ​​of the various ranges, the endpoint values ​​of the various ranges and individual point values, and individual point values ​​can be combined with each other to obtain one or more new numerical ranges, which should be considered as specifically disclosed herein.

[0025] As previously described, a first aspect of the present invention provides a method for preparing a sulfur-rich polymer, the method comprising:

[0026] S1. In the presence of a protective gas and a catalyst, sulfur, itaconic acid, and dimethylaminopropylmethacrylamide are reacted to obtain an intermediate product; the reaction conditions include: a temperature of 160-180℃ and a time of 2-5 h; the catalyst is zinc diethyldithiocarbamate.

[0027] S2. The intermediate product is dried to obtain the sulfur-rich polymer;

[0028] The mass ratio of the sulfur, the itaconic acid, and the dimethylaminopropylmethacrylamide is 1:0.8-1.2:2.0-3.0.

[0029] Preferably, in step S2, the drying conditions include: a temperature of 120-130°C and a time of 20-40 minutes.

[0030] Preferably, the protective gas is selected from at least one of nitrogen and argon.

[0031] In a preferred embodiment, the amount of catalyst used is 0.8-1.2 wt%, based on the total mass of the sulfur, itaconic acid, and dimethylaminopropylmethacrylamide.

[0032] As previously stated, the second aspect of the present invention provides a sulfur-rich polymer prepared by the method described in the first aspect.

[0033] Preferably, the sulfur-rich polymer has a softening point of 43-55°C, a penetration of 50-70 / 0.1 mm, and an average number-average molecular weight of 400-1000 g / mol.

[0034] As previously described, a third aspect of the present invention provides a composition for a waterproof coating, the composition comprising a main agent and an auxiliary agent:

[0035] The main agent includes a composite polymer emulsion, filler, and component A; the auxiliary agent includes at least one of thickener, dispersant, and defoamer.

[0036] Based on the total mass of the composition, the composition contains 40-60 wt% of a composite polymer emulsion, 20-35% of filler, 10-30 wt% of component A, and 0.4-11.5 wt% of additives;

[0037] Component A is an organic solution of a sulfur-rich polymer with a concentration of 25-40 wt%; the sulfur-rich polymer is the sulfur-rich polymer described in the second aspect above.

[0038] The composite polymer emulsion is a combination of silicone-acrylic emulsion and styrene-acrylic emulsion in a mass ratio of 1:2-3.5; the glass transition temperature of the silicone-acrylic emulsion is 19-23℃.

[0039] Preferably, the organic solution in the 25-40 wt% sulfur-rich polymer organic solution is selected from at least one of methanol, ethanol, and N,N-dimethylformamide; more preferably, it is ethanol.

[0040] Preferably, the additives further include a preservative; based on the total mass of the composition, the composition contains 40-60 wt% of a composite polymer emulsion, 10-30 wt% of component A, 0.1-0.4 wt% of a thickener, 0.1-0.5 wt% of a dispersant, 0.1-0.3 wt% of a defoamer, 20-35 wt% of a filler, and 0.1-0.3 wt% of a preservative.

[0041] More preferably, the additives further include water; based on the total mass of the composition, the composition contains 40-45 wt% of a composite polymer emulsion, 15-20 wt% of component A, 0.1-0.4 wt% of a thickener, 0.1-0.5 wt% of a dispersant, 0.1-0.3 wt% of a defoamer, 20-28 wt% of a filler, 8-10 wt% of water, and 0.1-0.3 wt% of a preservative. The inventors have found that, under this preferred embodiment, the obtained waterproof coating exhibits superior adhesion and mechanical strength, while also achieving better self-healing and antibacterial effects.

[0042] In a preferred embodiment, the glass transition temperature of the styrene-acrylic emulsion is -19 to -15°C. The inventors have discovered that, under this preferred embodiment, the obtained waterproof coating exhibits superior adhesion and mechanical strength.

[0043] Preferably, in order to increase the adhesion strength between the coating and the substrate and the self-healing ability of the coating, component A is an ethanol solution of a sulfur-rich polymer with a concentration of 30-35 wt%.

[0044] In a preferred embodiment, to improve the workability and storage stability of the coating, the thickener is selected from at least one of alkali-swellable thickeners and associative polyurethane thickeners.

[0045] To further improve the dispersion effect of the system, in this invention, the dispersant is preferably at least one of polyacrylate, polyphosphate, and polycarboxylate.

[0046] Preferably, the preservative is selected from at least one of 1,2-benzisothiazolinone, methylisothiazolinone, methylchloroisothiazolinone, and 1,2-benzisothiazolin-3-one; the inventors have found that, under this preferred condition, the waterproof coating obtained by the present invention has a better inhibitory effect on microorganisms.

[0047] Preferably, the filler is selected from at least one of superphosphate, barium sulfate, and titanium dioxide.

[0048] To further improve the density of the coating, the filler is more preferably a combination of heavy calcium carbonate and titanium dioxide.

[0049] As previously described, a fourth aspect of the present invention provides a method for preparing a waterproof coating, the method being carried out using the composition described in the third aspect above, comprising:

[0050] (1) A first mixture containing a dispersant, a defoamer and a portion of a composite polymer emulsion is mixed to obtain material I; the first mixture optionally contains water and a preservative;

[0051] (2) The filler and material I are mixed a second time to obtain material II;

[0052] (3) Mix component A, thickener, remaining composite polymer emulsion and material II in a third mixing process to obtain the waterproof coating.

[0053] It should be noted that in step (1), there are no special requirements for the specific amount of the composite polymer emulsion used, as long as it is mixed evenly; in order to obtain a more uniform and delicate coating, preferably, the amount of the composite polymer emulsion used in step (1) can be 30-50 wt% of the total amount.

[0054] Preferably, the first mixing, the second mixing, and the third mixing are each carried out independently under stirring conditions;

[0055] In step (1), the conditions for the first mixing include: a stirring speed of 450-900 rpm, a time of 3-5 min, and a temperature of 5-35℃.

[0056] Preferably, in step (2), the conditions for the second mixing include: a stirring speed of 1000-2000 rpm, a time of 30-60 min, and a temperature of 5-35℃.

[0057] Preferably, in step (3), the conditions for the third mixing include: a stirring speed of 1000-1500 rpm, a time of 10-30 min, and a temperature of 5-35℃.

[0058] More preferably, in step (1), the method further includes premixing water and a portion of the composite polymer emulsion, wherein the premixing conditions include: a temperature of 5-35°C, a stirring speed of 550-650 rpm, and a time of 1-2 min.

[0059] As previously stated, the fifth aspect of the present invention provides a waterproof coating prepared by the method described in the fourth aspect above.

[0060] As previously stated, the sixth aspect of the present invention provides the application of the waterproof coating described in the fifth aspect in the waterproofing of exposed roofs of buildings.

[0061] The present invention will be described in detail below through embodiments.

[0062] Unless otherwise specified, all reagents and raw materials involved in the following examples are commercially available products, and all reagents are analytical grade products.

[0063] In the following examples, unless otherwise specified, each wt% represents 0.1 kg.

[0064] raw material:

[0065] Styrene-acrylic emulsion I: Model: 5619, glass transition temperature: -19℃, purchased from Shanghai Baolijia Chemical Co., Ltd.

[0066] Styrene-acrylic emulsion II: Model: 7117, glass transition temperature: -9℃, purchased from Jinyoulai Industry and Trade Co., Ltd.

[0067] Silicone-acrylic emulsion I: Model: 8392, glass transition temperature: 23℃, purchased from Guangdong Yinyang Environmental Protection New Materials Co., Ltd.

[0068] Silicone-acrylic emulsion II: Model: KD96, glass transition temperature: 36℃, purchased from Shanghai Baolijia Chemical Co., Ltd.

[0069] Composite polymer emulsion I: a combination of silicone-acrylic emulsion I and styrene-acrylic emulsion I with a mass ratio of 1:2.5;

[0070] Composite polymer emulsion II: a combination of silicone-acrylic emulsion I and styrene-acrylic emulsion II in a mass ratio of 1:2.5;

[0071] Composite polymer emulsion III: a combination of silicone-acrylic emulsion II and styrene-acrylic emulsion II in a mass ratio of 1:2.5;

[0072] Composite polymer emulsion IV: a combination of silicone-acrylic emulsion I and styrene-acrylic emulsion I with a mass ratio of 1:0.7;

[0073] Thickener: Polyurethane, brand name U505, purchased from Wanhua Chemical Group Co., Ltd.

[0074] Dispersant: Ammonium polycarboxylate salt, brand name 5027, purchased from Guangzhou Meicheng New Material Technology Co., Ltd.;

[0075] Defoamer: Modified organosilicon, brand name DF1668, purchased from Foshan Koller Building Materials Co., Ltd.;

[0076] Filler: A combination of titanium dioxide and heavy calcium carbonate in a mass ratio of 1:5.75;

[0077] Preservatives: 5-chloro-2-methyl-4-isothiazolin-3-one and 2-methyl-4-isothiazolin-3-one, brand name Kathon, purchased from Jinan Qingtian Chemical Technology Co., Ltd.

[0078] Preparation Example 1

[0079] This preparation example illustrates the preparation of the sulfur-rich polymer of the present invention according to the method described below.

[0080] The method for preparing sulfur-rich polymers includes the following steps:

[0081] S1. In the presence of nitrogen and zinc diethyldithiocarbamate, sulfur, itaconic acid, and dimethylaminopropylmethacrylamide are reacted to obtain an intermediate product; the reaction conditions are: temperature 165℃ and time 3.5h.

[0082] S2. The intermediate product is dried to obtain the sulfur-rich polymer Z1;

[0083] The drying conditions are: temperature 120℃, time 30 min; based on the total mass of the sulfur, itaconic acid, and dimethylaminopropylmethacrylamide, the amount of catalyst is 1 wt%.

[0084] The mass ratio of the sulfur, the itaconic acid, and the dimethylaminopropylmethacrylamide is 1:1:3.

[0085] The sulfur-rich polymer has a softening point of 52°C, a penetration of 66 / 0.1 mm, and an average number-average molecular weight of 700 g / mol.

[0086] Preparation Example 2

[0087] This preparation example follows a similar process to Preparation Example 1, except that the amount of sulfur used is the same as in Preparation Example 1, but the mass ratio of sulfur, itaconic acid, and dimethylaminopropylmethacrylamide is 1:1:1. The remaining preparation steps and process conditions are the same as in Preparation Example 1. Polymer Z2 was obtained.

[0088] Preparation Example 3

[0089] This preparation example follows a similar process to Preparation Example 1, except that the amount of sulfur used is the same as in Preparation Example 1, but the mass ratio of sulfur, itaconic acid, and dimethylaminopropylmethacrylamide is 3:1:3. The remaining preparation steps and process conditions are the same as in Preparation Example 1. Polymer Z3 was obtained.

[0090] Example 1

[0091] This embodiment illustrates that the waterproof coating of the present invention is prepared according to the formula in Table 1 and the method described below.

[0092] The method for preparing the waterproof coating includes the following steps:

[0093] (1) A first mixture containing 40 wt% of the total amount of dispersant, water, preservative, defoamer and composite polymer emulsion is mixed to obtain material I; the conditions for the first mixing are: stirring speed of 800 rpm, time of 3 min and temperature of 25℃.

[0094] (2) The filler and the material I are mixed for the second time to obtain material II; the conditions for the second mixing are: stirring speed of 1500 rpm, time of 40 min, and temperature of 25℃.

[0095] (3) Component A, thickener, remaining composite polymer emulsion and material II are mixed in a third mixing process to obtain the waterproof coating. The conditions for the third mixing are: stirring speed of 1500 rpm, time of 20 min, and temperature of 25℃.

[0096] Unless otherwise specified, the remaining examples follow a similar process to Example 1, except that the formulations used in each example are different, as detailed in Table 1 (Note: Parameters not listed in Table 1 are the same as those in Example 1).

[0097] Table 1

[0098]

[0099]

[0100] Example 4

[0101] This embodiment follows a similar process to that of Example 1. The difference is that in this embodiment, composite polymer emulsion II of equal mass is used to replace composite polymer emulsion I in Example 1.

[0102] Everything else is the same as in Example 1.

[0103] Waterproof coating S4 was prepared.

[0104] Example 5

[0105] This embodiment follows a similar process to Example 1. The difference is that in this embodiment, an equal mass of 40wt% Z1 ethanol solution is used instead of the 30wt% Z1 ethanol solution in Example 1.

[0106] Everything else is the same as in Example 1.

[0107] Waterproof coating S5 was prepared.

[0108] Example 6

[0109] This embodiment follows a similar process to that of Embodiment 1. The difference is that in this embodiment, composite polymer emulsion III of equal mass is used to replace composite polymer emulsion I in Embodiment 1.

[0110] Everything else is the same as in Example 1.

[0111] Waterproof coating S6 was prepared.

[0112] Example 7

[0113] This embodiment follows a similar process to that of Embodiment 1. The difference is that, in this embodiment, an equal mass of composite polymer emulsion IV is used to replace composite polymer emulsion I in Embodiment 1.

[0114] Everything else is the same as in Example 1.

[0115] Waterproof coating S7 was prepared.

[0116] Comparative Example 1

[0117] This comparative example follows a similar procedure to Example 1, except that an equal mass of ethanol solution of Z2 with a concentration of 30 wt% is used instead of the ethanol solution of Z1 with a concentration of 30 wt% in Example 1.

[0118] Everything else is the same.

[0119] Waterproof coating DS1 was prepared.

[0120] Comparative Example 2

[0121] This comparative example follows a similar procedure to Example 1, except that an equal mass of ethanol solution of Z3 with a concentration of 30 wt% is used instead of the ethanol solution of Z1 with a concentration of 30 wt% in Example 1.

[0122] Everything else is the same as in Example 1.

[0123] Waterproof coating DS2 was prepared.

[0124] Comparative Example 3

[0125] This comparative example follows a similar procedure to Example 1, except that in this comparative example, an equal mass of Z1 and an ethanol solution (the mass of Z1 and the amount of ethanol are the same as in Example 1, but the two components are added independently during the preparation process) replaces the 30wt% Z1 ethanol solution in Example 1.

[0126] Everything else is the same as in Example 1.

[0127] Waterproof coating DS3 was prepared.

[0128] Test case

[0129] 1. Mechanical property testing: Tested according to GB / T 23445-2009;

[0130] 2. Bond strength test after artificial weathering treatment: Five untreated bond strength test specimens prepared according to GB / T 23445-2009 were treated according to the method in 5.4.3.3 of JC / T 864-2008. After the test, the specimens were placed under standard test conditions for 4 hours, and then the bond strength was tested according to the procedure in 7.6.3.1 of GB / T 23445-2009.

[0131] 3. Antibacterial effect test: The antibacterial performance test method of the antibacterial coating is tested according to HG / T 3950-2007. The bacterial species tested are Escherichia coli and Staphylococcus aureus.

[0132] 4. Self-healing performance test: Using GB / T 23445-2009 to test the impermeability of the specimen, use a 0.5mm thick utility knife to make a cut of about 10mm in the middle of the specimen, then place the specimen flat in a 60℃ oven for curing for 24 hours. After cooling, test the impermeability at 0.05MPa for 30 minutes. If all 3 specimens are impermeable, it is considered a pass; if 1 or 2 specimens are impermeable, it is considered a partial pass; if all 3 specimens are permeable, it is considered a fail.

[0133] The performance of the waterproof coatings obtained in each example was tested using the above testing method. The test results are shown in Table 2.

[0134] Table 2

[0135]

[0136]

[0137] As shown in Table 2, the sulfur-rich polymer prepared according to this invention demonstrates significant effectiveness when applied to waterproof coatings. It significantly improves the initial bonding strength of the coating, maintaining high bonding strength even after 720 hours of artificial weathering. This characteristic effectively solves the problem of waterproof layer failure due to blistering and peeling during actual use. Furthermore, the product possesses excellent self-healing and antibacterial properties, effectively ensuring the integrity and cleanliness of the coating film during use, significantly extending the product's effective service life and improving its performance.

[0138] The preferred embodiments of the present invention have been described in detail above; however, the present invention is not limited thereto. Within the scope of the inventive concept, various simple modifications can be made to the technical solutions of the present invention, including combinations of various technical features in any other suitable manner. These simple modifications and combinations should also be considered as the content disclosed in the present invention and are all within the protection scope of the present invention.

Claims

1. A composition for waterproof coatings, characterized in that, The composition contains a main agent and an auxiliary agent: The main agent includes a composite polymer emulsion, filler, and component A; the auxiliary agent includes at least one of thickener, dispersant, and defoamer. Based on the total mass of the composition, the composition contains 40-60 wt% of a composite polymer emulsion, 20-35% of filler, 10-30 wt% of component A, and 0.4-11.5 wt% of additives; Component A is an organic solution of a sulfur-rich polymer with a concentration of 25-40 wt%; the composite polymer emulsion is a combination of silicone-acrylic emulsion and styrene-acrylic emulsion with a mass ratio of 1:2-3.5; the glass transition temperature of the silicone-acrylic emulsion is 19-23℃. The sulfur-rich polymer is prepared by a method comprising the following steps: S1. In the presence of a protective gas and a catalyst, sulfur, itaconic acid, and dimethylaminopropylmethacrylamide are reacted to obtain an intermediate product; the reaction conditions include: a temperature of 160-180℃ and a time of 2-5 h; the catalyst is zinc diethyldithiocarbamate. S2. The intermediate product is dried to obtain the sulfur-rich polymer; The mass ratio of the sulfur, the itaconic acid, and the dimethylaminopropylmethacrylamide is 1:0.8-1.2:2.0-3.

2.

2. The composition according to claim 1, characterized in that, In step S2, the drying conditions include: a temperature of 120-130°C and a time of 20-40 minutes; And / or, based on the total mass of the sulfur, the itaconic acid, and the dimethylaminopropylmethacrylamide, the amount of the catalyst is 0.8-1.2 wt%.

3. The composition according to claim 1 or 2, characterized in that, The sulfur-rich polymer has a softening point of 43-55℃, a penetration of 50-70 / 0.1mm, and a number-average molecular weight of 400-1000 g / mol.

4. The composition according to claim 1 or 2, characterized in that, The organic solution in the 25-40 wt% sulfur-rich polymer organic solution is selected from at least one of methanol, ethanol, and N,N-dimethylformamide.

5. The composition according to claim 4, characterized in that, The organic solution in the 25-40 wt% sulfur-rich polymer organic solution is ethanol.

6. The composition according to claim 1, characterized in that, The additives also include preservatives; based on the total mass of the composition, the composition contains 40-60 wt% of a composite polymer emulsion, 10-30 wt% of component A, 20-35 wt% of filler, 0.1-0.4 wt% of thickener, 0.1-0.5 wt% of dispersant, 0.1-0.3 wt% of defoamer and 0.1-0.3 wt% of preservatives.

7. The composition according to claim 6, characterized in that, The additives also include water; based on the total mass of the composition, the composition contains 40-45 wt% of a composite polymer emulsion, 15-20 wt% of component A, 0.1-0.4 wt% of a thickener, 0.1-0.5 wt% of a dispersant, 0.1-0.3 wt% of a defoamer, 20-28 wt% of a filler, 8-10 wt% of water, and 0.1-0.3 wt% of a preservative.

8. The composition according to claim 1 or 2, characterized in that, The glass transition temperature of the styrene-acrylic emulsion is -19 to -15°C; And / or, component A is an ethanol solution of a sulfur-rich polymer with a concentration of 30-35 wt%.

9. A method for preparing a waterproof coating, characterized in that, This method is performed using the composition according to any one of claims 1-8, comprising: (1) A first mixture containing a dispersant, a defoamer and a portion of a composite polymer emulsion is mixed to obtain material I; the first mixture optionally contains water and a preservative; (2) The filler and material I are mixed a second time to obtain material II; (3) Mix component A, thickener, remaining composite polymer emulsion and material II in a third mixing process to obtain the waterproof coating.

10. The method according to claim 9, characterized in that, The first mixture, the second mixture, and the third mixture are each carried out independently under stirring conditions; In step (1), the conditions for the first mixing include: a stirring speed of 450-900 rpm, a time of 3-5 min, and a temperature of 5-35℃; And / or, in step (2), the conditions for the second mixing include: a stirring speed of 1000-2000 rpm, a time of 30-60 min, and a temperature of 5-35℃; And / or, in step (3), the conditions for the third mixing include: a stirring speed of 1000-1500 rpm, a time of 10-30 min, and a temperature of 5-35℃.

11. A waterproof coating prepared by the method of claim 9 or 10.

12. The application of the waterproof coating of claim 11 in the waterproofing of exposed roofs of buildings.

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