A super-weather-resistant one-component aspartame polyurea self-cleaning reflective coating and its preparation method

Abstract

The present invention relates to a super-weatherable single-component aspartic acid polyurea self-cleaning reflective coating. The raw materials of the coating include, by weight, 5-10 parts of a modified light-control material dispersion, 5-10 parts of a super-hydrophobic modified isocyanate, 10-20 parts of an aspartic acid ester internal plasticizing latent amine, 10-20 parts of an aliphatic isocyanate, 15-45 parts of a polyol, 20-40 parts of a filler, and 0.2-0.6 parts of an auxiliary agent. The modified light-control material dispersion is an aspartic acid ester-modified light-control material dispersion; the super-hydrophobic modified isocyanate is an isocyanate modified with the modified light-control material dispersion and a low-surface-energy molecule; the aspartic acid ester internal plasticizing latent amine is obtained by reacting aspartic acid ester, cyclohexane, and an aldehyde-containing compound. The resulting coating has good weather resistance, more reasonable stress-strain properties, and wear resistance, as well as extremely excellent directional reflection and sunlight absorption capabilities, a self-cleaning effect, and a long duration.

Description

Technical Field

[0001] The invention belongs to the technical field of building waterproof materials, and particularly relates to a super-weather-resistant single-component aspartame polyurea self-cleaning reflective coating and a preparation method thereof. Background Art

[0002] Polyurea is a relatively new coating technology. Developed in the late 1980s for the automotive industry, it is a highly versatile compound now used in a wide range of other applications, including corrosion protection for storage tank surfaces, waterproofing concrete structures such as parking lots, reservoirs, and tunnels, and as a joint filler or caulking material. Due to its fast-curing properties, corrosion resistance, and abrasion resistance, its application in engineering waterproofing has seen rapid growth over the past 30 years.

[0003] There are two common types of polyurea. Aromatic polyurea is more commonly used, offering a wide range of physical properties, making it suitable for a wide variety of applications. Their only drawback is poor UV stability. Aliphatic polyurea, another type, is achieved through various chemical methods to achieve improved UV stability. Two-component spray polyurea is a common option. However, the elastic region of the stress-strain curve for traditional two-component spray polyurea is too narrow, the plastic region is too large, and the curing time is too fast. This results in virtually no self-cleaning ability and low solar reflectivity. Its multi-layered structure necessitates a weather-resistant topcoat to form a monolithic waterproof layer, increasing the number of application passes and the risk of interlayer delamination. Furthermore, two-component polyurea requires on-site weighing and mixing, which increases labor and adds an additional process step. Furthermore, its rapid reaction time and short operation time place high demands on the construction team, leading to material waste and requiring strict on-site control. Currently, the predominant polyurea material on the market is spray polyurea, which exhibits poor weather resistance and weak self-cleaning and solar reflectivity.

[0004] For example, Chinese patent application CN114644877A discloses a self-cleaning, anti-corrosion, and weather-resistant polyurea coating, which consists of two parts, A and B. Component A consists of an aliphatic isocyanate trimer, and component B includes a fluorosilicone-modified secondary amine polymer, an anti-rust pigment, an anti-corrosion pigment filler, a dispersant, and a defoaming agent. It has good low-temperature flexibility, super strong adhesion to the surface of the coated object, and sufficient abrasion resistance and hardness. However, its weather resistance is insufficient, and it only does not change color or powder after 2000 hours of UV aging. The water contact angle is 104°, resulting in weak self-cleaning ability and no sunlight reflection performance. In addition, it is a two-component coating and requires stirring during on-site construction. Summary of the Invention

[0005] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a super weather-resistant one-component aspartame polyurea self-cleaning reflective coating and a preparation method thereof. The coating has good weather resistance and more reasonable stress-strain characteristics, a wider elastic range, and the ability to directionally reflect and absorb sunlight, and also has a self-cleaning effect.

[0006] In order to achieve the above object, the technical solution adopted by the present invention is:

[0007] The first aspect of the present invention provides a super-weatherable one-component aspartic polyurea self-cleaning reflective coating. Its raw materials include, by weight: 5-10 parts of modified light-control material dispersion, 5-10 parts of super-hydrophobic modified isocyanate, 10-20 parts of aspartic acid ester internal plasticizing latent amine, 10-20 parts of aliphatic isocyanate, 15-45 parts of polyol, 20-40 parts of filler and 0.2-0.6 parts of additive.

[0008] Preferably, the modified light-control material dispersion is a light-control material dispersion modified with aspartic acid ester; the super-hydrophobic modified isocyanate is an isocyanate modified with the modified light-control material dispersion and a low surface energy molecule; and the aspartic acid ester internal plasticizing latent amine is obtained by reacting aspartic acid ester, cyclohexane and an aldehyde-containing compound.

[0009] Preferably, in the modified light-control material dispersion, the mass ratio of the aspartic acid ester to the light-control material is (5-10):1, for example, 5.5:1, 6:1, 6.5:1, 7:1, 7.5:1, 8:1, 8.5:1, 9:1, 9.5:1, etc.; more preferably, it is (6.1-6.4):1.

[0010] Preferably, the modified light-control material dispersion contains 20-30% by mass of the aspartic acid ester, such as 21%, 22%, 23%, 24%, 25%, 26%, 27%, 28%, 29%, etc.; more preferably 24-26%.

[0011] Preferably, the modified light-control material dispersion contains 2.5-5% by mass of the light-control material, such as 3%, 3.5%, 4%, 4.5%, etc.; more preferably, 3.8-4.2%.

[0012] Preferably, the solvent in the modified light-control material dispersion includes any one or both of aromatic solvent No. 100 and aromatic solvent No. 150, preferably including No. 100 solvent oil and No. 150 solvent oil produced by Jiangsu Hualun Chemical Co., Ltd., Lianyungang Pengchen Special New Materials Co., Ltd., and Jiangyin Wuyang Chemical Co., Ltd.

[0013] Preferably, the light control material is selected from one or more of titanium oxide, zinc oxide, tungsten oxide, cerium oxide, silicon oxide, and vanadium oxide; more preferably, it is selected from one or more of titanium oxide, tungsten oxide, cerium oxide, and vanadium oxide; and even more preferably, it is titanium oxide, tungsten oxide, cerium oxide, and vanadium oxide.

[0014] Preferably, the mass ratio of the titanium oxide, tungsten oxide, cerium oxide and vanadium oxide is 1: (1.5-2.5): (0.5-1.5): (0.5-1.5); further preferably, it is 1: (1.8-2.2): (0.7-1.3): (0.7-1.2); further preferably, it is 1: (2.0-2.1): (1.0-1.1): (1.0-1.1).

[0015] Preferably, the average particle size of the light control material is in the range of 0.02-5 μm; more preferably, in the range of 0.1-4 μm; and even more preferably, in the range of 0.35-3 μm.

[0016] Furthermore, the oil absorption of the light-control material is between 15-25 g / 100 g, and is preferably purchased from the Institute of Organic Chemistry of the Yangtze River Delta Innovation Center.

[0017] According to some specific and preferred embodiments, the aspartic acid ester and the light-controlling material are dispersed in a solvent to form an aspartic acid ester dispersion and a light-controlling material dispersion, respectively. The two are then mixed and reacted at 30-50° C. for 12-24 hours to obtain the modified light-controlling material dispersion.

[0018] Furthermore, in the modified light-control material dispersion, the mass ratio of the aspartic acid ester dispersion to the light-control material dispersion is 1:(0.8-1.5); more preferably 1:(0.9-1.1).

[0019] Preferably, the low surface energy molecule is fluorosilane.

[0020] Furthermore, the fluorosilane is selected from one or more of tridecafluorooctyltriethoxysilane, heptadecafluorodecyltrimethoxysilane, pentafluorophenyltriethoxysilane, and nonafluorohexyltriethoxysilane.

[0021] Furthermore, the fluorosilane is tridecafluorooctyltriethoxysilane and / or nonafluorohexyltriethoxysilane.

[0022] According to a specific and preferred embodiment, the fluorosilanes are tridecafluorooctyltriethoxysilane and nonafluorohexyltriethoxysilane.

[0023] Preferably, the molar ratio of tridecafluorooctyltriethoxysilane to nonafluorohexyltriethoxysilane is (1.5-3):1, for example, 1.7:1, 1.9:1, 2.1:1, 2.3:1, 2.5:1, 2.7:1, 2.9:1, etc.; more preferably, it is (2.0-2.2):1.

[0024] Preferably, in the superhydrophobic modified isocyanate, the mass ratio of the isocyanate, the modified light-control material dispersion and the low surface energy molecule is (1.5-2.5): (1.5-2.5): 1, further preferably (1.7-2.3): (1.6-2.2): 1; and even more preferably (2.0-2.1): (1.9-2.0): 1.

[0025] Preferably, in the super-hydrophobic modified isocyanate, the isocyanate is an aliphatic isocyanate, and the aliphatic isocyanate and the aliphatic isocyanate in the raw material of the super-weatherable one-component aspartame polyurea self-cleaning reflective coating can be the same substance or different aliphatic isocyanates.

[0026] Furthermore, in the super-hydrophobic modified isocyanate, the aliphatic isocyanate and the aliphatic isocyanate in the raw material of the super-weatherable one-component aspartame self-cleaning reflective coating are the same substance.

[0027] According to some specific and preferred embodiments, the super-hydrophobic modified isocyanate is prepared by mixing the modified light-control material dispersion, the low surface energy molecules and isocyanate, and reacting them at a temperature of 80-120° C. for 1-4 hours to obtain the super-hydrophobic modified isocyanate.

[0028] Preferably, in the aspartic acid ester internal plasticizing latent amine, the molar ratio of the aspartic acid ester, the cyclohexane and the aldehyde-containing compound is 1:(1-2):(1.5-3); more preferably 1:(1-1.5):(1.9-2.1).

[0029] Preferably, the aldehyde-containing compound comprises formaldehyde.

[0030] According to some specific and preferred embodiments, the preparation method of the aspartic acid ester internal plasticizing latent amine is: mixing the aspartic acid ester and the cyclohexane in a closed container, then continuously adding the aldehyde-containing compound dropwise to the system, controlling the temperature to 50-80°C after the addition is completed, and keeping the reaction for 0.5-2h, and collecting the fraction above 130°C by post-treatment and reduced pressure distillation to obtain the product.

[0031] Preferably, the specific operation of the post-treatment is: heating, reflux and water separation, and cooling to room temperature after the water separation is completed.

[0032] Preferably, the aspartic acid ester is one or more compounds represented by the following formula (I):

[0033]

[0034] Wherein, X is an alkyl group with 1 to 3 carbon atoms, R 1 、R 2 、R 3 、R 4 They are straight-chain or branched-chain alkyl groups having 2 to 8 carbon atoms.

[0035] Furthermore, the aspartic acid ester represented by formula (I) can be purchased directly on the market or prepared by a specific synthesis method.

[0036] The preparation method of the aspartic acid ester comprises the following steps: in a nitrogen-filled protective state, slowly dropping dibutyl maleate (DBM) into a diprimary amine at room temperature in a reaction kettle, controlling the molar ratio of DBM to the diprimary amine to be (2-2.5):1, controlling the temperature not to exceed 40° C. during the dropping process, reacting at 60-70° C. for 24 hours after the dropping is completed to obtain a light yellow transparent liquid, and then leaving the mixture at room temperature for one month to complete the reaction, thereby obtaining a finished product.

[0037] Preferably, the filler is selected from one or more of heavy calcium carbonate, talc, and light calcium carbonate.

[0038] Furthermore, the D50 particle size of the heavy calcium carbonate is 1-10 μm, preferably including 101A and 201A of Jiangsu Qunxin Powder Technology Co., Ltd., LD200 and LD600 of Lida Superfine Industry (Suzhou) Co., Ltd., and CC-1000 and CC-1500 of Jiangxi Guangyuan Chemical Co., Ltd.

[0039] Furthermore, the talc powder has an average particle size of 10-15 μm, preferably including coating-grade talc powder with an average particle size of 1000 mesh provided by Jiangxi Kete Fine Powder Co., Ltd. and HS-218 high-grade fine talc powder with a D50 particle size of 12±1 μm provided by Jiangxi Guangyuan Chemical Co., Ltd.

[0040] Furthermore, the average particle size of the light calcium is 50-100 nm, and preferably includes nano-scale calcium carbonate 601 for silicone glue produced by Qingzhou Yuxin Calcium Industry Co., Ltd.

[0041] Preferably, the aliphatic isocyanate is selected from one or more of isophorone diisocyanate (IPDI), hexamethylene diisocyanate (HDI), and hexamethylene diisocyanate (HMDI), preferably including Wanhua Chemical's

[0042] Preferably, the polyol comprises polytetramethylene glycol polyol or polycarbonate polyol.

[0043] Furthermore, the average molecular weight of the polytetrahydrofuran polyol is 1000-2000 g / mol, and preferably comprises one or two of Hyosung PTMEG 2000 and PTMEG 1000 of South Korea.

[0044] Furthermore, the average molecular weight of the polycarbonate polyol is 1000-2000 g / mol, and preferably includes one or both of Japanese Ube PCDL2000 and PCDL1000.

[0045] Preferably, the auxiliary agent includes a dispersant and a defoaming agent.

[0046] Furthermore, the dispersant is selected from one or more of silane coupling agent, F108 dispersant, and acid-containing copolymer.

[0047] Furthermore, the silane coupling agent is selected from one or more of 3-aminopropyltriethoxysilane, KH550, and KH560; the 3-aminopropyltriethoxysilane preferably includes WD-50 produced by Hubei Wuda Organic Silicon New Materials Co., Ltd.

[0048] Furthermore, the acid-containing copolymer preferably includes Deqian Chemical 9250 dispersant.

[0049] Furthermore, the defoaming agent is selected from organosilicon defoaming agents and / or modified polysiloxanes.

[0050] Furthermore, the organosilicon defoamer preferably includes the defoamer with the brand number 066N produced by BYK Chemical Company and the organosilicon defoamer produced by Tiger Chemical Company.

[0051] Furthermore, the modified polysiloxane preferably includes 5500 produced by Deqian Chemical.

[0052] Preferably, the raw materials of the super weather-resistant one-component aspartame polyurea self-cleaning reflective coating further include 2-3 parts of color paste.

[0053] Furthermore, the color paste can be added to the system after adding the latent amine in the aspartic acid ester plasticizer. The color paste is used for color matching, and preferably includes the oil-based color paste series of Suzhou Shiming, Shanghai Jiasheng, and Dongguan Jifeng.

[0054] The second aspect of the present invention provides a method for preparing a super-weather-resistant one-component aspartame self-cleaning reflective coating: the modified light-control material, super-hydrophobic modified isocyanate, aliphatic isocyanate, polyol, filler, and additive are mixed, heated to react for 2-4 hours, then aliphatic isocyanate is added and the reaction is continued for 3-5 hours, and finally aspartic acid ester internal plasticizing latent amine is added and reacted for 1-3 hours to obtain the super-weather-resistant one-component aspartame self-cleaning reflective coating.

[0055] Preferably, the temperature after mixing the modified light-control material, super-hydrophobic modified isocyanate, aliphatic isocyanate, polyol, filler and additive is controlled to be 40-65°C; more preferably 50-60°C.

[0056] Preferably, the reaction temperature after the addition of the aliphatic isocyanate is controlled to be 70-85°C; more preferably 75-80°C.

[0057] Due to the application of the above technical solution, the present invention has the following advantages compared with the prior art:

[0058] (1) The asparagus polyurea self-cleaning reflective coating obtained in this application has excellent weather resistance, excellent weather resistance and anti-corrosion effect, and has certain wear resistance, which can increase the function of people walking on it. It is particularly suitable for application to outdoor concrete surface waterproofing, decoration and protection.

[0059] (2) The asparagus polyurea self-cleaning reflective coating obtained in this application has an outstanding self-cleaning effect, which can achieve a lotus leaf effect, and achieve an effect of being clean after being washed by rainwater, and the duration period is long. At the same time, it has extremely excellent sunlight reflection ability, which can reduce the surface temperature of the coating and improve the energy saving of the building.

[0060] (3) The asparagus polyurea self-cleaning reflective coating obtained in this application is a single-component material and does not require machine stirring, which saves labor and costs. DETAILED DESCRIPTION

[0061] All features disclosed in this specification, or all steps in methods or processes disclosed, except for mutually exclusive features or steps, may be combined in any manner.

[0062] In view of the shortcomings of the prior art, the inventors of this case, after long-term research and extensive practice, have proposed the technical solution of the present invention. The following will further explain this technical solution, its implementation process and principles.

[0063] In this application, a modified light-control material dispersion and super-hydrophobic modified isocyanate are added to a polyurea system formed by reacting an aliphatic isocyanate with an aspartic acid ester internal plasticized latent amine. Through molecular modification, light-reflective selective segments and super-hydrophobic groups are introduced, giving the coating the ability to directionally reflect and absorb sunlight. It also has a self-cleaning effect, which helps significantly improve photovoltaic power generation. It has an exposed, ultra-long service life of more than 25 years and complements our distributed photovoltaic building integrated waterproofing system. It can be constructed and formed on most substrates such as steel, wood, and concrete, and can adapt to the complex conditions of existing roof bases, achieving a permanent waterproof effect. If the amount of light-control material dispersion and super-hydrophobic modified isocyanate added is too high, the economic cost of the coating will increase.

[0064] Furthermore, in the modified light-control material dispersion, the light-control material is grafted onto aspartic acid ester to form a new molecular structure. This material has amphiphilic properties, allowing the inorganic material to be micro-dispersed in the organic carrier, repeatedly exerting the efficacy of the light-control material. In addition, aspartic acid ester will later react with isocyanate to form polymer molecules, which interpenetrate and anchor each other, improving the compatibility of the light-control material in the system and further enhancing the reflective performance of the coating.

[0065] Furthermore, the light-control material is a rare metal oxide, which has a certain gel-promoting effect on the reaction of aliphatic isocyanate and polyol to form polyurethane. Using the modified light-control material dispersion to modify the isocyanate can react and graft the light-control material to the isocyanate group, forming a whole with the polyurea system, accommodating more light-control materials into the polymer, and playing a huge role in the overall weather resistance of the material, so that it can pass UV aging for 5000 hours.

[0066] Furthermore, in the present application, aspartic acid ester of a specific structure is selected to react with cyclohexane and benzaldehyde to obtain a latent plasticizing amine in aspartic acid ester, so that in the polymerization process of isocyanate and aspartic acid ester, aspartic acid ester is a small molecule monomer. The copolymerization of the monomer in the molecular structure of the polymer destroys the regularity of the polymer chain, reduces the crystallinity of the polymer, and thus increases the plasticity, so that it has more reasonable stress-strain characteristics and a wider elastic range.

[0067] The ultra-weatherable, one-component aspartame polyurea self-cleaning reflective coating obtained in this application is an aliphatic, slow-reacting, high-performance coating material. It represents a new generation of composite functional polyurea materials that can directly form a waterproof layer without the need for a topcoat. Its application and performance differ from traditional polyurea coatings. The pot life of the mixture is adjustable, from a few minutes to several hours. It can be applied using dedicated two-component polyurea spray equipment, as well as brush application and conventional high-pressure airless spray, making its application more convenient and reliable. The coating achieves a high level of balance between performance, cost, and application.

[0068] The present invention is further described below with reference to the following examples. However, the present invention is not limited to the following examples. The implementation conditions used in the examples may be further adjusted according to the specific requirements of the application. Unspecified implementation conditions are conventional conditions in the industry. The technical features involved in the various embodiments of the present invention may be combined with each other as long as they do not conflict with each other.

[0069] The experimental methods in the following examples are conventional methods unless otherwise specified; the experimental materials used are purchased from conventional biochemical reagent manufacturers unless otherwise specified.

[0070] In the following examples and comparative examples, HMDI and IPDI were purchased from Wanhua Chemical; PTMEG 2000 and PTMEG 1000 were purchased from Hyosung, South Korea; PCDL2000 (PH-200) and PCDL1000 (PH-100) were purchased from Ube, Japan; the light control materials titanium oxide, tungsten oxide, cerium oxide, and vanadium oxide were purchased from the Institute of Organic Chemistry of the Yangtze River Delta Innovation Center (average particle size between 0.35 and 3 μm, oil absorption between 15 and 25 g / 100 g); solvent oil No. 150 was purchased from Jiangsu Hualun Chemical Co., Ltd.; the defoamer was BYK Chemical 066N; the dispersant was Deqian 9250; the filler was talc (HS-218 from Jiangxi Guangyuan Chemical Co., Ltd., heavy calcium was 101A from Jiangsu Qunxin Powder Technology Co., Ltd., and the talc was HS-218 from Jiangxi Guangyuan Chemical Co., Ltd.

[0071] Example 1

[0072] This example provides a super-weatherable one-component aspartame polyurea self-cleaning reflective coating, the raw materials of which include: 10 parts HMDI, 20 parts PTMEG2000, 15 parts PCDL1000, 5 parts modified light control material dispersion, 5 parts super-hydrophobic modified isocyanate, 10 parts aspartic acid ester internal plasticizing latent amine, 34.4 parts filler (50% by weight of heavy calcium 101A and talc HS-218), 0.3 parts dispersant, and 0.3 parts defoamer.

[0073] Preparation of Aspartic Acid: In a reactor under nitrogen protection, slowly add dibutyl maleate (DBM) dropwise to a diprimary amine at room temperature. The molar ratio of DBM to primary amine is 2.1:1. The diprimary amines are hexamethylenediamine and isopropylamine, and the molar ratio of hexamethylenediamine to isopropylamine is 2:1. During the addition, control the temperature above 40°C. After the addition is complete, react at 60-70°C for 24 hours to obtain a light yellow transparent liquid. Allow to stand at room temperature for one month to complete the reaction, resulting in the finished aspartic acid.

[0074] Preparation of the modified light-control dispersion: A light-control material dispersion and an aspartic acid ester dispersion are prepared in a feeding mass ratio of 1:1. First, an equal mass of solvent is added to the above-mentioned homemade aspartic acid ester to form an aspartic acid ester dispersion. The light-control material (titanium oxide, tungsten oxide, cerium oxide, vanadium oxide in a mass ratio of 1:2:1:1) is dispersed in a solvent (solvent oil No. 150) at a mass percentage of 8%, and the above-mentioned aspartic acid ester dispersion is added by constant pressure titration. After continuous stirring at below 40°C for 24 hours, the modified light-control material dispersion is obtained.

[0075] Preparation of super-hydrophobic modified isocyanate: The modified light-control material dispersion and low-surface-energy small molecule material (a mixture of tridecafluorooctyltriethoxysilane and nonafluorohexyltriethoxysilane, with a molar ratio of 2:1) are added to aliphatic isocyanate (HMDI) (the mass ratio of aliphatic isocyanate: modified light-control material dispersion: low-surface-energy small molecule material is 1:1:0.5), and placed in an oil bath at 100°C and stirred for reaction for 3 hours. After cooling, it is set aside to obtain the grafted super-hydrophobic modified isocyanate.

[0076] Preparation of latent plasticizer amine in aspartic acid ester: The prepared aspartic acid ester, cyclohexane and benzaldehyde are added in a molar ratio of 1:1:2. The aspartic acid ester is first pumped into the reactor, and then cyclohexane is added. Benzaldehyde is added dropwise under stirring and the temperature is controlled at 60°C. After the addition is completed, the reaction is continued by keeping the temperature for 1 hour, and then the temperature is raised to reflux to separate the water. After the separation is completed, the solution is cooled to room temperature and the fraction above 130°C is collected by reduced pressure distillation.

[0077] The preparation method of the super-weatherable one-component aspartic acid polyurea self-cleaning reflective coating includes the following steps: adding the grafted super-hydrophobic modified isocyanate, filler (pre-dried to less than 0.05% moisture), dispersant, defoamer, and polyol (tested moisture content is less than 0.05%) into a reactor, and adding the modified light-control material dispersion, stirring and reacting at 60°C for 3 hours, then heating to 80°C and adding aliphatic isocyanate, reacting for 4 hours, and then measuring the NCO content of the prepolymer. After reaching the set value, plasticizing latent amine in aspartic acid ester is added dropwise, stirring for 1 hour, and testing the fineness to reach 40μm, the material can be discharged to obtain the single-component polyurea coating.

[0078] Example 2

[0079] This example provides a super weather-resistant one-component aspartate polyurea self-cleaning reflective coating, which is basically the same as Example 1. The difference from Example 1 is that the raw material components of the super weather-resistant one-component aspartate polyurea self-cleaning reflective coating are different. The raw materials include: 10 parts of IPDI, 15 parts of PTMEG2000, 15 parts of PCDL1000, 5 parts of light control solution, 5 parts of super-hydrophobic modified isocyanate, 10 parts of aspartic acid ester internal plasticizing latent amine, 39.4 parts of filler (50% by weight of heavy calcium 101A and talc HS-218), 0.3 parts of dispersant, and 0.3 parts of defoaming agent.

[0080] Example 3

[0081] This example provides a super-weatherable one-component aspartate polyurea self-cleaning reflective coating, which is basically the same as Example 1. The difference from Example 1 is that the raw material formula of the super-weatherable one-component aspartate polyurea self-cleaning reflective coating is different. The raw materials include: 15 parts of IPDI, 20 parts of PTMEG2000, 15 parts of PCDL2000, 5 parts of modified light control material dispersion, 5 parts of super-hydrophobic modified isocyanate, 10 parts of aspartic acid ester internal plasticizing latent amine, 29.4 parts of filler (50% by weight of heavy calcium 101A and talc HS-218), 0.3 parts of dispersant, and 0.3 parts of defoamer.

[0082] Example 4

[0083] This example provides a super-weatherable one-component aspartate polyurea self-cleaning reflective coating, which is basically the same as Example 1. The difference from Example 1 is that the raw material components of the super-weatherable one-component aspartate polyurea self-cleaning reflective coating are used in different amounts. The raw materials include: 9.74 parts of HMDI, 19.47 parts of PTMEG2000, 14.61 parts of PCDL1000, 7.5 parts of modified light control material dispersion, 4.87 parts of super-hydrophobic modified isocyanate, 9.74 parts of aspartic acid ester internal plasticizing latent amine, 33.49 parts of filler (50% by weight of heavy calcium 101A and talc HS-218), 0.29 parts of dispersant, and 0.29 parts of defoamer.

[0084] Example 5

[0085] This example provides a super-weatherable one-component aspartate polyurea self-cleaning reflective coating, which is basically the same as Example 1. The difference from Example 1 is that the raw material components of the super-weatherable one-component aspartate polyurea self-cleaning reflective coating are used in different amounts. The raw materials include: 9.74 parts of HMDI, 19.47 parts of PTMEG2000, 14.61 parts of PCDL1000, 4.87 parts of modified light control material dispersion, 7.5 parts of super-hydrophobic modified isocyanate, 9.74 parts of aspartic acid ester internal plasticizing latent amine, 33.49 parts of filler (50% by weight of heavy calcium 101A and talc HS-218), 0.29 parts of dispersant, and 0.29 parts of defoamer.

[0086] Example 6

[0087] This example provides a super-weatherable one-component aspartate polyurea self-cleaning reflective coating, which is basically the same as Example 1. The difference from Example 1 is that the raw material components of the super-weatherable one-component aspartate polyurea self-cleaning reflective coating are used in different amounts. The raw materials include: 9.44 parts of HMDI, 18.89 parts of PTMEG2000, 14.17 parts of PCDL1000, 4.72 parts of modified light control material dispersion, 4.72 parts of super-hydrophobic modified isocyanate, 15 parts of aspartic acid ester internal plasticizing latent amine, 32.49 parts of filler (50% by weight of heavy calcium 101A and talc HS-218), 0.28 parts of dispersant, and 0.28 parts of defoamer.

[0088] Comparative Example 1

[0089] This example provides a super weather-resistant one-component aspart polyurea self-cleaning reflective coating, which is basically the same as Example 1. The difference from Example 1 is that the raw material components of the super weather-resistant one-component aspart polyurea self-cleaning reflective coating are different. The raw materials include: 10.53 parts of HMDI, 21.05 parts of PTMEG2000, 15.79 parts of PCDL1000, 5.26 parts of super-hydrophobic modified isocyanate, 10.53 parts of aspartic acid ester internal plasticizer latent amine, 36.21 parts of filler (50% by weight of heavy calcium 101A and talc HS-218), 0.32 parts of dispersant, and 0.32 parts of defoamer.

[0090] Comparative Example 2

[0091] This example provides a super-weatherable one-component aspartate polyurea self-cleaning reflective coating, which is basically the same as Example 1. The difference from Example 1 is that the raw material components of the super-weatherable one-component aspartate polyurea self-cleaning reflective coating are different. The raw materials include: 10.53 parts of HMDI, 21.05 parts of PTMEG2000, 15.79 parts of PCDL1000, 5.26 parts of modified light control material dispersion, 10.53 parts of aspartic acid ester internal plasticizer latent amine, 36.21 parts of filler (50% by weight of heavy calcium 101A and talc HS-218), 0.3 parts of dispersant, and 0.3 parts of defoamer.

[0092] Comparative Example 3

[0093] This example provides a super-weatherable one-component aspartame polyurea self-cleaning reflective coating, which is basically the same as Example 1. The difference from Example 1 is that the raw material components of the super-weatherable one-component aspartame polyurea self-cleaning reflective coating are different. The raw materials include: 11.11 parts of HMDI, 22.22 parts of PTMEG2000, 16.67 parts of PCDL1000, 5.56 parts of modified light control material dispersion, 5.56 parts of super-hydrophobic modified isocyanate, 38.22 parts of filler (50% by weight of heavy calcium 101A and talc HS-218), 0.33 parts of dispersant, and 0.33 parts of defoaming agent.

[0094] Comparative Example 4

[0095] This example provides a super-weatherable one-component aspartic polyurea self-cleaning reflective coating, which is basically the same as Example 1. The only difference from Example 1 is that the conventional latent curing agent Incozol EH from the UK is used to replace the aspartic acid ester internal plasticizing latent amine.

[0096] Comparative Example 5

[0097] This example provides a super-weatherable one-component aspartic polyurea self-cleaning reflective coating, which is basically the same as Example 1. The difference from Example 1 is that the raw material components of the super-weatherable one-component aspartic polyurea self-cleaning reflective coating are different. The raw materials include: 10 parts of HMDI, 20 parts of PTMEG2000, 15 parts of PCDL1000, 2.5 parts of light control material dispersion, 2.5 parts of aspartic acid ester dispersion, 5 parts of super-hydrophobic modified isocyanate, 10 parts of aspartic acid ester internal plasticizing latent amine, 34.4 parts of filler (50% by weight of heavy calcium 101A and talc HS-218), 0.3 parts of dispersant, and 0.3 parts of defoaming agent.

[0098] Preparation method of super weather-resistant one-component aspartic acid polyurea self-cleaning reflective coating: add the grafted super-hydrophobic modified isocyanate, filler (pre-dried to less than 0.05% moisture), dispersant, defoamer, and polyol (tested moisture content is less than 0.05%) into the reactor, and add the light control material dispersion and aspartic acid ester dispersion, stir and react at 60°C for 3 hours, then raise the temperature to 80°C and add aliphatic isocyanate, react for 4 hours, and then measure the NCO content of the prepolymer. After reaching the set value, add the plasticizing latent amine in aspartic acid ester dropwise, stir for 1 hour, and test the fineness to reach 40μm, then the material can be discharged to obtain the one-component polyurea coating.

[0099] Performance Testing

[0100] The waterproof coatings prepared in the above Examples 1-6 and Comparative Examples 1-5 were subjected to the following performance tests. The specific results are shown in Table 1.

[0101] Table 1 Performance test results of waterproof coatings obtained in Examples and Comparative Examples

[0102]

[0103]

[0104] The above data show that the present invention uses modified light-control materials, super-hydrophobic modified isocyanate, and aspartic acid ester internal plasticized latent amine-modified polyurea coating to prepare a single-component aspartic polyurea that achieves extremely superior technical results in terms of weather resistance, self-cleaning effect, sunlight reflectivity, and wear resistance. At the same time, it can also maintain other properties that far exceed the standard requirements. It is suitable for application to outdoor concrete surfaces, playing the role of waterproofing, decoration, and protection. At the same time, it can reduce the surface temperature of the coating and improve building energy conservation, and has broad market prospects.

[0105] The above embodiments are intended only to illustrate the technical concepts and features of the present invention. Their purpose is to enable those skilled in the art to understand the contents of the present invention and implement them accordingly. They are not intended to limit the scope of protection of the present invention. All equivalent modifications made based on the spirit and essence of the present invention are intended to be covered by the scope of protection of the present invention.

Claims

1. A super weather-resistant one-component aspartame polyurea self-cleaning reflective coating, characterized by: The raw materials include, by weight: 5-10 parts of modified light-control material dispersion, 5-10 parts of super-hydrophobic modified isocyanate, 10-20 parts of aspartic acid ester internal plasticizing latent amine, 10-20 parts of aliphatic isocyanate, 15-45 parts of polyol, 20-40 parts of filler and 0.2-0.6 parts of additive; The modified light-control material dispersion is a light-control material dispersion modified with aspartic acid ester; The super-hydrophobic modified isocyanate is an isocyanate modified by the modified light-control material dispersion and the low surface energy molecules; The aspartic acid ester internal plasticizing latent amine is obtained by reacting aspartic acid ester, cyclohexane and an aldehyde-containing compound; The light control material is selected from any one or more of titanium oxide, zinc oxide, tungsten oxide, cerium oxide, silicon oxide, and vanadium oxide.

2. The super weather-resistant one-component aspartame polyurea self-cleaning reflective coating according to claim 1, characterized in that: In the modified light-control material dispersion, the mass ratio of the aspartic acid ester to the light-control material is (5-10):1; And / or, the modified light-control material dispersion contains 20-30% by mass of the aspartic acid ester; And / or, the modified light-control material dispersion contains 2.5-5% by mass of the light-control material; And / or, the modified light-control material dispersion further comprises a solvent, and the solvent comprises any one or both of aromatic hydrocarbon solvent No. 100 and aromatic hydrocarbon solvent No.

150.

3. The super weather-resistant one-component aspartame polyurea self-cleaning reflective coating according to claim 1, characterized in that: The average particle size of the light control material is in the range of 0.02-5 μm.

4. The super weather-resistant one-component aspartame polyurea self-cleaning reflective coating according to claim 3, characterized in that: The light control material is titanium oxide, tungsten oxide, cerium oxide and vanadium oxide, and the mass ratio of the titanium oxide, tungsten oxide, cerium oxide and vanadium oxide is 1: (1.5-2.5): (0.5-1.5): (0.5-1.5).

5. The super weather-resistant one-component aspartame polyurea self-cleaning reflective coating according to claim 1, characterized in that: The aspartic acid ester and the light-controlling material are dispersed in a solvent to form an aspartic acid ester dispersion and a light-controlling material dispersion, respectively. The two are then mixed and reacted at 30-50° C. for 12-24 hours to obtain the modified light-controlling material dispersion.

6. The super weather-resistant one-component aspartame polyurea self-cleaning reflective coating according to claim 1, characterized in that: In the super-hydrophobic modified isocyanate, the mass ratio of the isocyanate, the modified light-control material dispersion and the low surface energy molecule is (1.5-2.5): (1.5-2.5): 1; and / or, in the superhydrophobic modified isocyanate, the isocyanate is an aliphatic isocyanate; And / or, the low surface energy molecule is a fluorosilane, and the fluorosilane is selected from one or more of tridecafluorooctyltriethoxysilane, heptadecafluorodecyltrimethoxysilane, pentafluorophenyltriethoxysilane, and nonafluorohexyltriethoxysilane.

7. The super weather-resistant one-component aspartame polyurea self-cleaning reflective coating according to claim 6, characterized in that: The fluorosilanes are tridecafluorooctyltriethoxysilane and nonafluorohexyltriethoxysilane, and the molar ratio of tridecafluorooctyltriethoxysilane to nonafluorohexyltriethoxysilane is (1.5-3):

1.

8. The super-weatherable one-component aspartame polyurea self-cleaning reflective coating according to claim 1, wherein the super-hydrophobic modified isocyanate is prepared by mixing the modified light-control material dispersion, the low surface energy molecules, and isocyanate, and reacting them at a temperature of 80-120° C. for 1-4 hours to obtain the super-hydrophobic modified isocyanate. And / or, the preparation method of the aspartic acid ester internal plasticizing latent amine is: mixing the aspartic acid ester and the cyclohexane in a sealed container, then continuously adding the aldehyde-containing compound dropwise to the system, controlling the temperature to 50-80°C after the addition is completed, and keeping the reaction for 0.5-2 hours, and collecting the fraction above 130°C by post-treatment and reduced pressure distillation to obtain the product.

9. The super weather-resistant one-component aspartame polyurea self-cleaning reflective coating according to claim 1, characterized in that: The aspartic acid ester is one or more compounds represented by the following formula (I): Wherein, X is an alkyl group with 1 to 3 carbon atoms, R 1 、R 2 、R 3 、R 4 are straight-chain or branched-chain alkyl groups having 2 to 8 carbon atoms; And / or, the filler is selected from one or more of heavy calcium, talc, and light calcium; And / or, the aliphatic isocyanate is selected from any one or more of IPDI, HDI, and HMDI; And / or, the polyol includes polytetramethylene glycol polyol and polycarbonate polyol; And / or, the auxiliary agent includes a dispersant and a defoamer, the dispersant is selected from one or more of a silane coupling agent, an F108 dispersant, and an acid-containing copolymer, and the defoamer is selected from an organosilicon defoamer and / or a modified polysiloxane; And / or, the raw materials of the super weather-resistant one-component aspartame polyurea self-cleaning reflective coating further include 2-3 parts of color paste.

10. A method for preparing the super-weather-resistant one-component aspartame polyurea self-cleaning reflective coating according to any one of claims 1 to 9, characterized in that: The modified light-control material dispersion, super-hydrophobic modified isocyanate, polyol, filler, and additive are mixed and heated to react for 2-4 hours, and then aliphatic isocyanate is added to continue the reaction for 3-5 hours, and finally aspartic acid ester internal plasticizing latent amine is added to react for 1-3 hours to obtain the super-weatherable one-component aspartic polyurea self-cleaning reflective coating.

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