An epoxy-modified two-component hand-scraped polyurea waterproof material and its preparation method

Abstract

The present invention discloses an epoxy-modified two-component hand-scraped polyurea waterproof material and its preparation method. The polyurea waterproof material comprises component A and component B. Component A is an epoxy-modified polyurethane prepolymer, which is prepared by reacting a first polyether polyol, an epoxy resin, a plasticizer and an isocyanate. Component B includes a second polyether polyol, a chain extender, a filler, a pigment, a light stabilizer and an antifoaming agent. The present invention modifies the two-component hand-scraped polyurea with an epoxy resin, improves the mechanical properties of the polyurea and prolongs the gel time.

Description

Technical Field

[0001] The present invention belongs to the technical field of waterproof materials, and more specifically, relates to an epoxy-modified two-component hand-scraped polyurea waterproof material and a preparation method thereof. Background Art

[0002] Spray polyurea elastomer (SPUA) is different from traditional polyurethane waterproof coatings. It is an elastomer material formed by the reaction of an isocyanate component and an amino compound component. It is a special product that combines a new type of environmental protection coating and green construction technology. Because of its high strength, high wear resistance, fast curing speed, and short construction period, it is widely used in various fields, especially in the fields of chemical corrosion prevention, waterproof protection, and national defense military.

[0003] In the 1970s, based on polyurethane reaction injection molding (RIM) technology, spray elastomer technology was vigorously developed. It broke the limitation that traditional RIM technology must use molds, extended the characteristics of instant curing and high-speed reaction to a new field, greatly enriched the application range of polyurethane, and broadened the concept of coatings and painting technology. The first article on spray polyurea elastomer technology was published by chemist Mr. Dudley J. Primeaux II in 1989. Once published, it caused a huge sensation in the global chemical industry.

[0004] The spray polyurea elastomer (SPUA) technology in China developed in 1995, and the team led by Professor Huang Weibo began to conduct research. And it has seen vigorous development, and more and more researchers have started to pay attention to polyurea elastomer technology and spraying equipment. By 2022, the global polyurea coating market size reached 8165 million yuan, and it is expected to grow to 11386 million yuan by 2028, with a compound annual growth rate of 5.59%.

[0005] However, although the spray polyurea elastomer technology has advantages that cannot be compared with other waterproof coatings, it still has some disadvantages. For example, the adhesion between the polyurea coating and the substrate is poor because the reaction rate between the isocyanate group and the amine group in the polyurea component is too fast. After curing and crosslinking, the product has a high hardness and insufficient wetting ability with the substrate, resulting in a decrease in adhesion. The operability of spray polyurea is poor. Because the reaction activity of the raw materials is very high and the gel time is short, a coating is formed in a very short time, making it impossible to operate for a long time. It is impossible to construct in a small area. The equipment used for spray polyurea has great difficulty in small-area construction, which is likely to cause problems such as waste of raw materials and high construction costs. Summary of the Invention

[0006] The object of the present invention is to address the above problems. The present invention provides an epoxy-modified two-component hand-scraped polyurea waterproof material and a preparation method thereof. The present invention makes further improvements on the basis of the traditional spray polyurea formula. By using the reaction of epoxy resin and isocyanate, the polyurea waterproof material is modified to prepare an epoxy-modified two-component hand-scraped polyurea, which not only meets the mechanical properties required for spray polyurea but also greatly extends the gel time. The modified polyurea has higher mechanical properties, can be applied to small-area construction, has an extended operation time, and an increased adhesion to the substrate.

[0007] To achieve the above object, on the one hand, the present invention provides an epoxy-modified two-component hand-scraped polyurea waterproof material, which includes component A and component B;

[0008] Component A is an epoxy-modified polyurethane prepolymer, and the epoxy-modified polyurethane prepolymer is prepared by reacting a first polyether polyol, an epoxy resin, a plasticizer, and an isocyanate;

[0009] Component B includes: a second polyether polyol, a chain extender, a filler, a pigment, a light stabilizer, and an antifoaming agent.

[0010] According to the present invention, preferably, the epoxy-modified polyurethane prepolymer is prepared by a method including the following steps: First, the first polyether polyol, the epoxy resin, and the plasticizer are vacuum dehydrated, then the isocyanate is added for reaction, and finally vacuum degassing is carried out to obtain the epoxy-modified polyurethane prepolymer.

[0011] According to the present invention, preferably, the vacuum dehydration is carried out at 110 - 115 °C;

[0012] Then the temperature is lowered to 50 - 70 °C, the isocyanate is added and stirred for reaction for 0.5 - 1 h, and the temperature is raised to 80 - 90 °C and the reaction is continued for 2 - 5 h (preferably, the temperature is raised to 84 - 86 °C and the reaction is continued for 3 - 3.5 h);

[0013] Finally, vacuum degassing is carried out at 50 - 55 °C.

[0014] According to the present invention, preferably, in component A, by mass, the dosage of the first polyether polyol is 80 - 140 parts, preferably 100 - 120 parts; the dosage of the epoxy resin is 15 - 30 parts, preferably 20 - 25 parts; the dosage of the isocyanate is 20 - 40 parts, preferably 25 - 35 parts; the dosage of the plasticizer is 5 - 20 parts, preferably 15 - 20 parts;

[0015] In the component B, based on parts by mass, the dosage of the second polyether polyol is 80 - 120 parts, preferably 90 - 110 parts; the dosage of the chain extender is 10 - 40 parts, preferably 20 - 30 parts; the dosage of the filler is 1 - 10 parts, preferably 5 - 8 parts; the dosage of the pigment is 0.5 - 1; the dosage of the light stabilizer is 0.1 - 0.5 parts, preferably 0.2 - 0.4 parts; the dosage of the defoamer is 0.05 - 0.1 parts, preferably 0.07 - 0.08 parts.

[0016] According to the present invention, preferably, the epoxy resin is at least one of E - 44, E - 51 and E - 128, preferably epoxy resin E - 44.

[0017] According to the present invention, preferably, the chain extender is at least one of 3,3'-dichloro - 4,4'-diaminodiphenylmethane (MOCA), 4,4’-bis(sec - butylamino)diphenylmethane (MDBA), 3 - hydroxyethyloxyethyl (HER) and dimethylthiotoluenediamine (DMTDA);

[0018] Preferably, the chain extender is 3 - hydroxyethyloxyethyl (HER) and 4,4’-bis(sec - butylamino)diphenylmethane (MDBA), and the mass ratio of 3 - hydroxyethyloxyethyl (HER) to 4,4’-bis(sec - butylamino)diphenylmethane (MDBA) is (1 - 2):1.

[0019] In the present invention, in order to reduce the reaction activity and prolong the gel time, the chain extender used in the present invention is a sterically hindered amine - type chain extender and an aromatic alcohol - type chain extender. Among them, the compound use of 4,4’-bis(sec - butylamino)diphenylmethane (MDBA) and 3 - hydroxyethyloxyethyl (HER) has the best effect;

[0020] HER is an absolute aromatic diol chain extender, and it has good compatibility with MDI. Because this alcohol - type chain extender contains a benzene ring in its structure, it can provide good mechanical strength for the material. It has special advantages such as better plasticity, tear strength, initial strength, Shore hardness, compression set, low shrinkage, anti - cutting, good flexibility, anti - permeability, low melting point, and convenient operation.

[0021] 4,4’-bis(sec - butylamino)diphenylmethane is a sterically hindered amine cyclic - structure secondary amine chain extender. It can generate a linear polymer network, and the cross - linking degree of the polyurea formulation can be controlled by adding a high - functionality polyol. Its reaction activity is lower than that of other aromatic amines. The low reaction activity enables 4,4’-bis(sec - butylamino)diphenylmethane to be used as an effective curing agent in TDI and MDI formulations. The polymer cured with 4,4’-bis(sec - butylamino)diphenylmethane has a longer pot life and higher toughness, and can also improve strength, adhesion, impact resistance and low - temperature resistance.

[0022] According to the present invention, preferably, each of the first polyether polyol and the second polyether polyol is independently at least one of polypropylene glycol, polypropylene triol, and polytetrahydrofuran polyol;

[0023] The isocyanate is at least one of diphenylmethane diisocyanate (MDI), toluene diisocyanate (TDI), dicyclohexylmethane diisocyanate (HMDI), and isophorone diisocyanate (IPDI); preferably, the isocyanate is diphenylmethane diisocyanate (MDI) and / or toluene diisocyanate (TDI);

[0024] The plasticizer is at least one of diisononyl phthalate (DINP), dibutyl phthalate (DBP), and dioctyl phthalate (DOP); preferably, the plasticizer is diisononyl phthalate (DINP);

[0025] The light stabilizer is B97 and / or B75; preferably B97;

[0026] The defoaming agent is at least one of BYK-054, BYK-066N, and BYK-065; preferably BYK-066N;

[0027] The filler is heavy calcium carbonate;

[0028] The pigment is carbon black.

[0029] In the present invention, BYK-054, BYK-066N, and BYK-065 are all purchased from BYK-Chemie GmbH.

[0030] In the present invention, the number-average molecular weight of the first polyether polyol and the second polyether polyol is independently 1000-5000; preferably, the molecular weights of the polypropylene glycol and the polypropylene triol are 2000 and 5000 respectively.

[0031] According to the present invention, preferably, the mass ratio of the A component to the B component is (1-2):1, preferably 1:1.

[0032] Another aspect of the present invention provides a method for preparing the above polyurea waterproof material, the preparation method comprising:

[0033] Preparation of the A component: React the first polyether polyol, epoxy resin, plasticizer, and isocyanate to obtain the epoxy-modified polyurethane prepolymer;

[0034] Preparation of Component B: Vacuum dehydrate the second polyether polyol, pigment and filler, then add the chain extender and stir, and then add the light stabilizer and defoamer, stir and vacuum degas to obtain Component B.

[0035] According to the present invention, preferably, the preparation of Component A: First, vacuum dehydrate the first polyether polyol, epoxy resin and plasticizer, then add the isocyanate for reaction, and finally vacuum degas to obtain the epoxy-modified polyurethane prepolymer;

[0036] Preferably, in the preparation of Component A: The vacuum dehydration is carried out at 110 - 115 °C; then cool down to 50 - 70 °C, add the isocyanate and stir for reaction for 0.5 - 1 h, heat up to 80 - 90 °C and continue the reaction for 2 - 5 h (preferably, heat up to 84 - 86 °C and continue the reaction for 3 - 3.5 h); finally, carry out vacuum degassing at 50 - 55 °C;

[0037] Preferably, in the preparation of Component B: The vacuum dehydration is carried out at 110 - 115 °C; then cool down to 70 - 80 °C, add the chain extender and stir for 0.5 - 1 h, then cool down to 60 - 65 °C, add the light stabilizer and defoamer and stir for 0.5 - 1 h, and cool down to 50 - 55 °C for vacuum degassing.

[0038] The present invention has the following beneficial effects:

[0039] (1) The present invention modifies the two-component hand-scraped polyurea with epoxy resin, improves the mechanical properties of the polyurea and prolongs the gel time.

[0040] (2) While ensuring the mechanical properties, the present invention prolongs the gel time of the product, making it have better operability and can be applied to small-area construction in narrow parts.

[0041] (3) The present invention reduces the reaction rate of the polyurea, increases its adhesion to the substrate, and can be used as a repair for spray polyurea, avoiding problems such as material waste and inconvenient construction.

[0042] (4) It has excellent comprehensive product performance: The prepared two-component hand-scraped polyurea can be directly constructed after mixing, showing excellent mechanical properties, meeting the performance indicators of spray polyurea type II: tensile strength ≥ 16 MPa, elongation at break ≥ 450%, and tear strength ≥ 50 N / mm.

[0043] (5) The present invention does not require the use of catalysts and spraying equipment. Component A and Component B are mixed and stirred according to the mass ratio and then can be constructed. The operation is simple and convenient, reducing the production cost and use cost to a certain extent, and belonging to an environmentally friendly polyurea coating.

[0044] Other features and advantages of the present invention will be described in detail in the following specific embodiments section. Specific Embodiments

[0045] The preferred embodiments of the present invention will be described in more detail below. Although the preferred embodiments of the present invention are described below, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided to make the present invention more thorough and complete, and to fully convey the scope of the present invention to those skilled in the art.

[0046] The present invention will be further illustrated by the following examples:

[0047] In the following examples and comparative examples, the average particle size of the heavy calcium used is 800 mesh.

[0048] In the following examples and comparative examples, the 4,4'-bis(sec-butylamino)diphenylmethane used was purchased from Zhangjiagang Yarui Chemical Co., Ltd., with the trade name Unilink4200;

[0049] The BYK-066N used was purchased from BYK-Chemie GmbH.

[0050] Example 1

[0051] Composition of Component A:

[0052]

[0053]

[0054] Composition of Component B:

[0055] Name Mass / g Polyoxypropylene triol PPG-5000 100 Chain extender HER 20 Chain extender 4,4'-bis(sec-butylamino)diphenylmethane 10 Heavy calcium carbonate 6.5 Carbon black 0.8 Light stabilizer B97 0.5 Defoamer BYK-066N 0.1

[0056] Preparation of Component A: First, PPG-2000, E-44, and DINP were added to a four-necked flask, heated to 112 °C, and evacuated for dehydration for 3 h until the water content was below 0.03%. Then, the vacuum was closed, and the temperature was lowered to 60 °C. MDI was added and stirred for reaction for 0.5 h. The temperature was raised to 85 °C and the reaction was continued for 3 h. Then, the temperature was lowered to 55 °C and evacuated for degassing for 15 min, and then the product was discharged.

[0057] Preparation of Component B: Add PPG-5000 into a four-necked flask. After heating up to 90°C, add heavy calcium carbonate and carbon black. Then heat up to 112°C and dehydrate under vacuum for 3 h. Close the vacuum until the water content is below 0.03%. Cool down to 70°C and add chain extender HER and 4,4'-bis(sec-butylamino)diphenylmethane (Unilink4200), and stir for 0.5 h. Then cool down to 60°C, add B97 and BYK-066N, and stir for 0.5 h. Then cool down to 55°C and degas under vacuum for 15 min, and then discharge the material.

[0058] Mix Components A and B in a mass ratio of 1:1, stir, and then carry out the construction.

[0059] Example 2

[0060] Composition of Component A:

[0061] Name Mass / g Polyoxypropylene diol PPG-2000 100 Epoxy resin E-51 25 Isocyanate MDI 35 Plasticizer DINP 18

[0062] Composition of Component B:

[0063] Name Mass / g Polyoxypropylene triol PPG-5000 110 Chain extender HER 15 Chain extender 4,4'-bis(sec-butylamino)diphenylmethane 10 Heavy calcium carbonate 6.5 Carbon black 0.8 Light stabilizer B97 0.5 Defoamer BYK-066N 0.1

[0064] Preparation of Component A: First, add PPG-2000, E-51, and DINP into a four-necked flask. Heat up to 112°C and dehydrate under vacuum for 3 h. Close the vacuum until the water content is below 0.03%. Then cool down to 60°C, add MDI, and stir for 0.5 h. Heat up to 85°C and continue the reaction for 3 h. Then cool down to 55°C and degas under vacuum for 15 min, and then discharge the material.

[0065] Preparation of Component B: Add PPG-5000 into a four-necked flask. After heating up to 90°C, add heavy calcium carbonate and carbon black. Then heat up to 112°C and dehydrate under vacuum for 3 h. Close the vacuum until the water content is below 0.03%. Cool down to 70°C and add chain extender HER and 4,4'-bis(sec-butylamino)diphenylmethane (Unilink4200), and stir for 0.5 h. Then cool down to 60°C, add B97 and BYK-066N, and stir for 0.5 h. Then cool down to 55°C and degas under vacuum for 15 min, and then discharge the material.

[0066] Mix Components A and B in a mass ratio of 1:1, stir, and then carry out the construction.

[0067] Example 3

[0068] Composition of Component A:

[0069] Name Mass / g Polyoxypropylene diol PPG-2000 110 Epoxy resin E-128 23 Isocyanate MDI 33 Plasticizer DINP 20

[0070] Composition of Component B:

[0071] Name Mass / g Polyoxypropylene triol PPG-5000 100 Chain extender HER 17 Chain extender 4,4'-bis(sec-butylamino)diphenylmethane 13 Heavy calcium carbonate 6.5 Carbon black 0.8 Light stabilizer B97 0.5 Defoamer BYK-066N 0.1

[0072] Preparation of Component A: First, add PPG-2000, E-128, and DINP into a four-necked flask. Heat up to 112°C and vacuum-dehydrate for 3 hours until the water content is below 0.03%. Then close the vacuum, cool down to 60°C, add MDI, and stir for 0.5 hours. Heat up to 85°C and continue to react for 3 hours. Then cool down to 55°C and vacuum-degas for 15 minutes, and discharge the material.

[0073] Preparation of Component B: Add PPG-5000 into a four-necked flask. After heating up to 90°C, add heavy calcium carbonate and carbon black. Then heat up to 112°C and vacuum-dehydrate for 3 hours until the water content is below 0.03%. Close the vacuum, cool down to 70°C, add chain extender HER and 4,4'-bis(sec-butylamino)diphenylmethane (Unilink4200), and stir for 0.5 hours. Then cool down to 60°C, add B97 and BYK-066N, and stir for 0.5 hours. Then cool down to 55°C and vacuum-degas for 15 minutes, and discharge the material.

[0074] Mix Components A and B in a mass ratio of 1:1, stir, and apply.

[0075] Example 4

[0076] Composition of Component A:

[0077] Name Mass / g Polyoxypropylene diol PPG-2000 110 Epoxy resin E-128 23 Isocyanate MDI 33 Plasticizer DINP 20

[0078] Composition of Component B:

[0079] Name Mass / g Polyoxypropylene triol PPG-5000 100 Chain extender MOCA 5 Chain extender DMTDA 25 Heavy calcium carbonate 6.5 Carbon black 0.8 Light stabilizer B97 0.5 Defoamer BYK-066N 0.1

[0080] Preparation of Component A: First, add PPG-2000, E-128, and DINP into a four-necked flask. Heat up to 112°C and vacuum-dehydrate for 3 hours until the water content is below 0.03%. Then close the vacuum, cool down to 60°C, add MDI, and stir for 0.5 hours. Heat up to 85°C and continue to react for 3 hours. Then cool down to 55°C and vacuum-degas for 15 minutes, and discharge the material.

[0081] Preparation of Component B: Add PPG-5000 into a four-necked flask. After heating up to 90°C, add heavy calcium carbonate and carbon black. Then heat up to 112°C and vacuum-dehydrate for 3 hours until the water content is below 0.03%. Close the vacuum, cool down to 70°C, add chain extender MOCA and DMTDA, and stir for 0.5 hours. Then cool down to 60°C, add B97 and BYK-066N, and stir for 0.5 hours. Then cool down to 55°C and vacuum-degas for 15 minutes, and discharge the material.

[0082] Mix Components A and B in a mass ratio of 1:1, stir, and apply.

[0083] Example 5

[0084] Composition of Component A:

[0085] Name Mass / g Polyoxypropylene diol PPG-2000 110 Epoxy resin E-128 22 Isocyanate MDI 33 Plasticizer DINP 20

[0086] Composition of Component B:

[0087] Name Mass / g Polyoxypropylene triol PPG-5000 100 Chain extender HER 15 Chain extender 4,4'-bis(sec-butylamino)diphenylmethane 15 Heavy calcium carbonate 6.5 Carbon black 0.8 Light stabilizer B97 0.5 Defoamer BYK-066N 0.1

[0088] Preparation of Component A: First, add polyether polyol PPG-2000, E-128, and DINP into a four-necked flask, heat up to 112°C, evacuate and dehydrate for 3 h until the water content is below 0.03%, then close the vacuum, cool down to 60°C, add MDI and stir for 0.5 h, heat up to 85°C and continue to react for 3 h, then cool down to 55°C, evacuate and degas for 15 min, and discharge the material.

[0089] Preparation of Component B: Add PPG-5000 into a four-necked flask, heat up to 90°C, then add heavy calcium carbonate and carbon black, further heat up to 112°C, evacuate and dehydrate for 3 h until the water content is below 0.03%, then close the vacuum, cool down to 70°C, add chain extender HER and 4,4'-bis(sec-butylamino)diphenylmethane (Unilink4200) and stir for 0.5 h, then cool down to 60°C, add B97 and BYK-066N and stir for 0.5 h, then cool down to 55°C, evacuate and degas for 15 min, and discharge the material.

[0090] Components A and B are mixed and stirred for construction according to a mass ratio of 1:1.

[0091] Comparative Example 1

[0092] Composition of Component A:

[0093] Name Mass / g Polyoxypropylene diol PPG-2000 110 Isocyanate MDI 33 Plasticizer DINP 20

[0094] Composition of Component B:

[0095]

[0096]

[0097] Preparation of Component A: First, add polyether polyol PPG-2000 and DINP into a four-necked flask, heat up to 112°C, evacuate and dehydrate for 3 h until the water content is below 0.03%, then close the vacuum, cool down to 60°C, add MDI and stir for 0.5 h, heat up to 85°C and continue to react for 3 h, then cool down to 55°C, evacuate and degas for 15 min, and discharge the material.

[0098] Preparation of Component B: Add PPG-5000 into a four-necked flask. After heating up to 90°C, add heavy calcium carbonate and carbon black. Then heat up to 112°C, evacuate to remove water for 3 h. Close the vacuum until the water content is below 0.03%. Cool down to 70°C, add chain extender HER and 4,4'-bis(sec-butylamino)diphenylmethane (Unilink4200), and stir for 0.5 h. Then cool down to 60°C, add B97 and BYK-066N, and stir for 0.5 h. Then cool down to 55°C, evacuate to remove gas for 15 min, and discharge the material.

[0099] Mix Component A and Component B in a mass ratio of 1:1, stir, and apply.

[0100] Test Examples

[0101] Conduct performance tests on the examples and comparative examples. The specific test results are shown in Table 1. Among them, the tensile strength, elongation at break, tear strength, and adhesion strength are tested according to the standard of Type II sprayed polyurea waterproof coating in GB / T 23446-2009; the test conditions for the gel time and surface drying time are: temperature 23 ± 2°C, humidity 50 ± 10% RH.

[0102] Table 1

[0103]

[0104]

[0105] As can be seen from the above table, the polyurea modified with epoxy resin has higher mechanical properties and a longer gel time compared with the unmodified comparative example. Among them, the polyurea in Example 1 has the best comprehensive performance. Therefore, using epoxy resin E-44 as the modifier has the best effect.

[0106] The embodiments of the present invention have been described above. The above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and variations are obvious to those of ordinary skill in the art in the technical field without departing from the scope and spirit of the described embodiments.

Claims

1. An epoxy-modified two-component hand-scraped polyurea waterproof material, characterized in that, The polyurea waterproof material comprises component A and component B; Component A is an epoxy-modified polyurethane prepolymer, which is prepared by reacting a first polyether polyol, an epoxy resin, a plasticizer and an isocyanate; Component B includes: a second polyether polyol, a chain extender, a filler, a pigment, a light stabilizer and an antifoaming agent; Wherein, in component A, by mass, the dosage of the first polyether polyol is 80-140 parts; the dosage of the epoxy resin is 15-30 parts; the dosage of the isocyanate is 20-40 parts; the dosage of the plasticizer is 5-20 parts; In component B, by mass, the dosage of the second polyether polyol is 80-120 parts; the dosage of the chain extender is 10-40 parts; the dosage of the filler is 1-10 parts; the dosage of the pigment is 0.5-1 part; the dosage of the light stabilizer is 0.1-0.5 part; the dosage of the antifoaming agent is 0.05-0.1 part; The chain extender is HER and 4,4'-bis(sec-butylamino)diphenylmethane, and the mass ratio of HER to 4,4'-bis(sec-butylamino)diphenylmethane is (1-2):

1.

2. The polyurea waterproof material according to claim 1, wherein, The epoxy-modified polyurethane prepolymer is prepared by a method comprising the following steps: First, the first polyether polyol, the epoxy resin and the plasticizer are vacuum dehydrated, then the isocyanate is added for reaction, and finally vacuum degassing is carried out to obtain the epoxy-modified polyurethane prepolymer.

3. The polyurea waterproof material according to claim 2, wherein, The vacuum dehydration is carried out at 110-115°C; Then the temperature is lowered to 50-70°C, the isocyanate is added and stirred for reaction for 0.5-1 h, and the temperature is raised to 80-90°C and the reaction is continued for 2-5 h; Finally, vacuum degassing is carried out at 50-55°C.

4. The polyurea waterproof material according to any one of claims 1-3, wherein, In component A, by mass, the dosage of the first polyether polyol is 100-120 parts; the dosage of the epoxy resin is 20-25 parts; the dosage of the isocyanate is 25-35 parts; the dosage of the plasticizer is 15-20 parts; In component B, by mass, the dosage of the second polyether polyol is 90-110 parts; the dosage of the chain extender is 20-30 parts; the dosage of the filler is 5-8 parts; the dosage of the pigment is 0.5-1 part; the dosage of the light stabilizer is 0.2-0.4 part; the dosage of the antifoaming agent is 0.07-0.08 part.

5. The polyurea waterproof material according to any one of claims 1-3, wherein, The epoxy resin is at least one of E-44, E-51 and E-128.

6. The polyurea waterproof material according to claim 5, wherein, The epoxy resin is epoxy resin E-44.

7. The polyurea waterproof material according to any one of claims 1-3, wherein, The first polyether polyol and the second polyether polyol are each independently at least one of polypropylene glycol, polypropylene triol and polytetrahydrofuran polyol; The isocyanate is at least one of diphenylmethane diisocyanate, toluene diisocyanate, dicyclohexylmethane diisocyanate and isophorone diisocyanate; The plasticizer is at least one of diisononyl phthalate, dibutyl phthalate and dioctyl phthalate; The light stabilizer is B97 and / or B75; The defoamer is at least one of BYK-054, BYK-066N and BYK-065; The filler is heavy calcium carbonate; The pigment is carbon black.

8. The polyurea waterproof material according to any one of claims 1-3, wherein, The mass ratio of component A to component B is (1-2):

1.

9. A method for preparing the polyurea waterproof material according to any one of claims 1-8, characterized in that, The preparation method includes: The preparation of component A: React the first polyether polyol, epoxy resin, plasticizer and isocyanate to obtain the epoxy-modified polyurethane prepolymer; The preparation of component B: Vacuum dehydrate the second polyether polyol, pigment and filler, then add the chain extender and stir, and then add the light stabilizer and defoamer and stir and vacuum degas to obtain component B.

10. The preparation method according to claim 9, wherein, The preparation of component A: First, vacuum dehydrate the first polyether polyol, epoxy resin and plasticizer, then add the isocyanate and react, and finally vacuum degas to obtain the epoxy-modified polyurethane prepolymer.

11. The preparation method according to claim 10, wherein, In the preparation of component A: Carry out the vacuum dehydration at 110-115 °C; then cool down to 50-70 °C, add the isocyanate and stir and react for 0.5-1 h, heat up to 80-90 °C and continue to react for 2-5 h; finally, carry out the vacuum degas at 50-55 °C; In the preparation of component B: Carry out the vacuum dehydration at 110-115 °C; Then cool down to 70-80 °C, add the chain extender and stir for 0.5-1 h, then cool down to 60-65 °C, add the light stabilizer and defoamer and stir for 0.5-1 h, and cool down to 50-55 °C to carry out the vacuum degas.

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