Transparent weather-resistant polyurea waterproof coating

Abstract

The invention discloses a transparent weather-resistant polyurea waterproof coating which comprises a polyurea emulsion, a functional additive and a performance additive, the substance mass ratio of the polyurea emulsion to the functional additive to the modified additive is (11-15): (4-7): 3. The light transmittance of the coating in the visible light range exceeds 90%, the special decoration or protection requirement is met, the weather resistance is excellent, the yellowing index of a coating film is smaller than 1 through a 1000-hour QUV accelerated aging test, and obvious pulverization and cracking phenomena do not exist.

Description

Technical Field

[0001] The present invention relates to the technical field of waterproof coatings, and in particular to a transparent weather-resistant polyurea waterproof coating. Background Art

[0002] With the development of the construction industry, the demand for waterproof materials is increasing, especially in applications requiring a transparent protective layer. Traditional waterproof coatings often lack weather resistance and transparency, making them difficult to meet the requirements of long-term outdoor use. In recent years, polyurea materials have been widely used in the waterproofing field due to their excellent physical and chemical properties. However, there is still room for improvement in transparency and weather resistance. It is difficult to achieve a coordinated improvement in transparency and crack resistance in products, and the products have poor weathering stability. Based on this, the present invention provides a transparent, weather-resistant polyurea waterproof coating. Summary of the Invention

[0003] In view of the defects of the prior art, the purpose of the present invention is to provide a transparent weather-resistant polyurea waterproof coating to solve the problems raised in the above background technology.

[0004] The present invention solves the technical problem by adopting the following technical solutions: The present invention provides a transparent weather-resistant polyurea waterproof coating, comprising a polyurea emulsion, a functional additive, and a modifying agent; the mass ratio of the polyurea emulsion, the functional additive, and the modifying agent is (11-15):(4-7):3; wherein the polyurea emulsion is prepared by the preparation method of Example 1 in CN118620503B.

[0005] Preferably, the preparation method of the functional additive is S01: 3-5 parts of nano zinc oxide, 1-2 parts of nano titanium oxide and 2-4 parts of yttrium nitrate solution are mixed and added into 5-8 parts of 6% sodium citrate solution and stirred evenly to obtain functional liquid A; Add 2-5 parts of fumed silica and 3-6 parts of calcium sulfate whiskers to 5-8 parts of 4% by mass lanthanum chloride solution and stir evenly to obtain functional liquid B; Functional liquid A and functional liquid B were ultrasonically modified in a weight ratio of 5:3 to obtain a functional modifier; S02: adding nano-alumina to the sodium alginate solution in a weight ratio of 3:5 and stirring evenly to obtain a nano-alumina solution; S03: The nano-alumina liquid and the functional modifier are mixed in a weight ratio of 5:3 and ball-milled at a ball-milling speed of 1000 r / min for 2 h. After the ball-milling is completed, the mixture is filtered and dried to obtain the functional additive.

[0006] Preferably, the mass fraction of the yttrium nitrate solution is 2-5%; the mass fraction of the sodium alginate solution is 5-9%.

[0007] Preferably, the ultrasonic modification treatment is performed at an ultrasonic power of 350-400W and for 1 hour.

[0008] Preferably, the preparation method of the modified auxiliary agent is: S11: 3-5 parts of chitosan solution, 1-2 parts of silane coupling agent KH560, 5-8 parts of clay, and 4-7 parts of sodium dodecylbenzenesulfonate solution are uniformly mixed to obtain an additive solution; S12: preheating the glass microbeads at 70-80°C for 20-30 minutes, and then cooling to room temperature. The glass microbeads cooled to room temperature and the additive liquid are mixed in a weight ratio of 5:3 and ball-milled. After the ball milling is completed, the modified additive is obtained.

[0009] Preferably, the mass fraction of the chitosan solution is 3-5%; the mass fraction of the sodium dodecylbenzenesulfonate solution is 2-5%.

[0010] Preferably, the mixing and ball milling treatment is performed at a ball milling speed of 1000-1500 r / min and the ball milling is performed for 2 hours.

[0011] Preferably, the preparation method of the polyurea waterproof coating is: weighing raw materials according to parts by weight, and mixing the raw materials evenly to obtain the waterproof coating.

[0012] Preferably, the mixing speed is 650-750 r / min, and the mixing time is 1 hour.

[0013] Compared with the prior art, the present invention has the following beneficial effects: The present invention provides a polyurea waterproof coating with both high transparency and excellent weather resistance to meet the needs of long-term outdoor use. High transparency: the transmittance of this coating in the visible light range exceeds 90%, meeting special decoration or protection needs; excellent weather resistance: after 1000 hours of QUV accelerated aging test, the yellowing index of the coating is less than 1, and there is no obvious powdering and cracking phenomenon, showing excellent weather resistance, and the product has excellent crack resistance. The functional additives and modification aids added to the product are coordinated and synergistic, and the performance coordination and performance stability of the product are improved. At the same time, the nano-alumina liquid and the functional modifier in the functional additive are mutually blended and ball-milled for improvement, the functional liquid A and the functional liquid B in the functional modifier are ultrasonically coordinated and improved, and the blended nano-alumina liquid is synergistically enhanced, so that the performance coordination and weather stability of the product are improved. At the same time, the modification aid uses glass microbeads as a matrix and is blended with raw materials such as chitosan solution, and is thus blended into the system to further enhance the performance coordination of the system. DETAILED DESCRIPTION

[0014] The following is a clear and complete description of the technical solutions in the embodiments of the present invention in conjunction with specific embodiments. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0015] A transparent weather-resistant polyurea waterproof coating of this embodiment includes a polyurea emulsion, a functional additive, and a modifying agent; the mass ratio of the polyurea emulsion, the functional additive, and the modifying agent is (11-15):(4-7):3; wherein the polyurea emulsion is prepared according to the preparation method of Example 1 in CN118620503B.

[0016] The preparation method of the functional additive of this embodiment is S01: 3-5 parts of nano zinc oxide, 1-2 parts of nano titanium oxide and 2-4 parts of yttrium nitrate solution are mixed and added into 5-8 parts of 6% sodium citrate solution and stirred evenly to obtain functional liquid A; Add 2-5 parts of fumed silica and 3-6 parts of calcium sulfate whiskers to 5-8 parts of 4% by mass lanthanum chloride solution and stir evenly to obtain functional liquid B; Functional liquid A and functional liquid B were ultrasonically modified in a weight ratio of 5:3 to obtain a functional modifier; S02: adding nano-alumina to the sodium alginate solution in a weight ratio of 3:5 and stirring evenly to obtain a nano-alumina solution; S03: The nano-alumina liquid and the functional modifier are mixed in a weight ratio of 5:3 and ball-milled at a ball-milling speed of 1000 r / min for 2 h. After the ball-milling is completed, the mixture is filtered and dried to obtain the functional additive.

[0017] The mass fraction of the yttrium nitrate solution in this embodiment is 2-5%; the mass fraction of the sodium alginate solution is 5-9%.

[0018] The ultrasonic modification treatment in this embodiment was performed at an ultrasonic power of 350-400 W and for 1 hour.

[0019] The preparation method of the modification aid of this embodiment is: S11: 3-5 parts of chitosan solution, 1-2 parts of silane coupling agent KH560, 5-8 parts of clay, and 4-7 parts of sodium dodecylbenzenesulfonate solution are uniformly mixed to obtain an additive solution; S12: preheating the glass microbeads at 70-80°C for 20-30 minutes, and then cooling to room temperature. The glass microbeads cooled to room temperature and the additive liquid are mixed in a weight ratio of 5:3 and ball-milled. After the ball milling is completed, the modified additive is obtained.

[0020] The mass fraction of the chitosan solution in this embodiment is 3-5%; the mass fraction of the sodium dodecylbenzenesulfonate solution is 2-5%.

[0021] The mixing and ball milling treatment in this embodiment is performed at a ball milling speed of 1000-1500 r / min for 2 h.

[0022] The preparation method of the polyurea waterproof coating of this embodiment is: weighing raw materials according to weight parts, and mixing the raw materials evenly to obtain the waterproof coating.

[0023] The mixing speed in this embodiment is 650-750 r / min, and the mixing time is 1 hour.

[0024] Example 1. A transparent weather-resistant polyurea waterproof coating of this embodiment includes a polyurea emulsion, a functional additive, and a modifying agent; the mass ratio of the polyurea emulsion, the functional additive, and the modifying agent is 11:4:3; wherein the polyurea emulsion is prepared by the preparation method of Example 1 in CN118620503B.

[0025] The preparation method of the functional additive of this embodiment is S01: 3 parts of nano zinc oxide, 1 part of nano titanium oxide and 2 parts of yttrium nitrate solution are mixed and added into 5 parts of 6% sodium citrate solution and stirred evenly to obtain functional liquid A; Add 2 parts of fumed silica and 3 parts of calcium sulfate whiskers to 5 parts of 4% by mass lanthanum chloride solution and stir evenly to obtain functional liquid B; Functional liquid A and functional liquid B were ultrasonically modified in a weight ratio of 5:3 to obtain a functional modifier; S02: adding nano-alumina to the sodium alginate solution in a weight ratio of 3:5 and stirring evenly to obtain a nano-alumina solution; S03: The nano-alumina liquid and the functional modifier are mixed in a weight ratio of 5:3 and ball-milled at a ball-milling speed of 1000 r / min for 2 h. After the ball-milling is completed, the mixture is filtered and dried to obtain the functional additive.

[0026] The mass fraction of the yttrium nitrate solution in this embodiment is 2%; the mass fraction of the sodium alginate solution is 5%.

[0027] The ultrasonic modification treatment in this embodiment was performed at an ultrasonic power of 350 W and for 1 hour.

[0028] The preparation method of the modification aid of this embodiment is: S11: 3 parts of chitosan solution, 1 part of silane coupling agent KH560, 5 parts of clay and 4 parts of sodium dodecylbenzenesulfonate solution are mixed evenly to obtain an additive solution; S12: preheating the glass microbeads at 70° C. for 20 minutes, and then cooling to room temperature. The glass microbeads cooled to room temperature and the additive liquid are mixed in a weight ratio of 5:3 and ball-milled. After the ball milling is completed, the modified additive is obtained.

[0029] The mass fraction of the chitosan solution in this embodiment is 3%; the mass fraction of the sodium dodecylbenzenesulfonate solution is 2%.

[0030] The mixing and ball milling process in this embodiment was performed at a ball milling speed of 1000 r / min for 2 h.

[0031] The preparation method of the polyurea waterproof coating of this embodiment is: weighing raw materials according to weight parts, and mixing the raw materials evenly to obtain the waterproof coating.

[0032] The mixing speed in this embodiment is 650 r / min and the mixing time is 1 hour.

[0033] Example 2. A transparent weather-resistant polyurea waterproof coating of this embodiment includes a polyurea emulsion, a functional additive, and a modifying agent; the mass ratio of the polyurea emulsion, the functional additive, and the modifying agent is 15:7:3; wherein the polyurea emulsion is prepared by the preparation method of Example 1 in CN118620503B.

[0034] The preparation method of the functional additive of this embodiment is S01: 5 parts of nano zinc oxide, 2 parts of nano titanium oxide and 4 parts of yttrium nitrate solution were mixed and added into 8 parts of 6% sodium citrate solution and stirred evenly to obtain functional liquid A; Add 5 parts of fumed silica and 6 parts of calcium sulfate whiskers to 8 parts of 4% by mass lanthanum chloride solution and stir evenly to obtain functional liquid B; Functional liquid A and functional liquid B were ultrasonically modified in a weight ratio of 5:3 to obtain a functional modifier; S02: adding nano-alumina to the sodium alginate solution in a weight ratio of 3:5 and stirring evenly to obtain a nano-alumina solution; S03: The nano-alumina liquid and the functional modifier are mixed in a weight ratio of 5:3 and ball-milled at a ball-milling speed of 1000 r / min for 2 h. After the ball-milling is completed, the mixture is filtered and dried to obtain the functional additive.

[0035] The mass fraction of the yttrium nitrate solution in this embodiment is 5%; the mass fraction of the sodium alginate solution is 9%.

[0036] The ultrasonic modification treatment in this embodiment was performed at an ultrasonic power of 400 W and for 1 hour.

[0037] The preparation method of the modification aid of this embodiment is: S11: 5 parts of chitosan solution, 2 parts of silane coupling agent KH560, 8 parts of clay and 7 parts of sodium dodecylbenzenesulfonate solution are mixed evenly to obtain an additive solution; S12: preheating the glass microbeads at 80° C. for 30 minutes, and then cooling to room temperature. The glass microbeads cooled to room temperature and the additive liquid are mixed in a weight ratio of 5:3 and ball-milled. After the ball milling is completed, the modified additive is obtained.

[0038] The mass fraction of the chitosan solution in this embodiment is 5%; the mass fraction of the sodium dodecylbenzenesulfonate solution is 5%.

[0039] The mixing and ball milling process in this embodiment was performed at a ball milling speed of 1500 r / min for 2 h.

[0040] The preparation method of the polyurea waterproof coating of this embodiment is: weighing raw materials according to weight parts, and mixing the raw materials evenly to obtain the waterproof coating.

[0041] The mixing speed in this embodiment is 750 r / min and the mixing time is 1 hour.

[0042] Example 3. A transparent weather-resistant polyurea waterproof coating of this embodiment includes a polyurea emulsion, a functional additive, and a modifying agent; the mass ratio of the polyurea emulsion, the functional additive, and the modifying agent is 13:5.5:3; wherein the polyurea emulsion is prepared by the preparation method of Example 1 in CN118620503B.

[0043] The preparation method of the functional additive of this embodiment is S01: 4 parts of nano zinc oxide, 1.5 parts of nano titanium oxide and 3 parts of yttrium nitrate solution were mixed and added into 6.5 parts of 6% sodium citrate solution and stirred evenly to obtain functional liquid A; 3.5 parts of fumed silica and 4.5 parts of calcium sulfate whiskers were added to 6.5 parts of 4% by mass lanthanum chloride solution and stirred to obtain functional liquid B; Functional liquid A and functional liquid B were ultrasonically modified in a weight ratio of 5:3 to obtain a functional modifier; S02: adding nano-alumina to the sodium alginate solution in a weight ratio of 3:5 and stirring evenly to obtain a nano-alumina solution; S03: The nano-alumina liquid and the functional modifier are mixed in a weight ratio of 5:3 and ball-milled at a ball-milling speed of 1000 r / min for 2 h. After the ball-milling is completed, the mixture is filtered and dried to obtain the functional additive.

[0044] The mass fraction of the yttrium nitrate solution in this embodiment is 3.5%; the mass fraction of the sodium alginate solution is 7%.

[0045] The ultrasonic modification treatment in this embodiment was performed at an ultrasonic power of 375 W and for 1 h.

[0046] The preparation method of the modification aid of this embodiment is: S11: 4 parts of chitosan solution, 1.5 parts of silane coupling agent KH560, 6.5 parts of clay, and 5.5 parts of sodium dodecylbenzenesulfonate solution were mixed to obtain an additive solution; S12: preheating the glass microbeads at 75° C. for 25 minutes, and then cooling to room temperature. The glass microbeads cooled to room temperature and the additive liquid are mixed in a weight ratio of 5:3 and ball-milled. After the ball milling is completed, the modified additive is obtained.

[0047] The mass fraction of the chitosan solution in this embodiment is 4%; the mass fraction of the sodium dodecylbenzenesulfonate solution is 3.5%.

[0048] The mixing and ball milling treatment in this embodiment was performed at a ball milling speed of 1250 r / min and the ball milling was performed for 2 h.

[0049] The preparation method of the polyurea waterproof coating of this embodiment is: weighing raw materials according to weight parts, and mixing the raw materials evenly to obtain the waterproof coating.

[0050] The mixing speed in this embodiment is 700 r / min and the mixing time is 1 hour.

[0051] Comparative Example 1. The difference from Example 3 is that no functional additives are added.

[0052] Comparative Example 2. The difference from Example 3 is that no functional modifier is added in the preparation of the functional additive.

[0053] Comparative Example 3. The difference from Example 3 is that no functional liquid B is added to the functional modifier.

[0054] Comparative Example 4. The difference from Example 3 is that no functional liquid A is added to the functional modifier.

[0055] Comparative Example 5. The difference from Example 3 is that no nano-alumina liquid is added in the preparation of the functional additive.

[0056] Comparative Example 6. The difference from Example 3 is that no modifying auxiliary agent is added.

[0057] The product performance tests of Examples 1-3 and Comparative Examples 1-6 are as follows:

[0058] It can be seen from Examples 1-3 and Comparative Examples 1-6 that the light transmittance, crack resistance and yellowing resistance of the product of Example 3 of the present invention are relatively excellent; however, when no functional additives and no modifying agents are added, the performance of the products deteriorates, among which the functional additives have the greatest impact on the product performance. When no functional modifier is added in the preparation of the functional additive, no functional liquid B is added to the functional modifier, no functional liquid A is added to the functional modifier, and no nano-alumina liquid is added in the preparation of the functional additive, the performance of the products tends to deteriorate. The functional additives obtained by the specific method of the present invention have the most significant performance effect on the product.

[0059] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the invention can be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations that come within the meaning and range of equivalents of the claims be embraced therein.

[0060] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A transparent weather-resistant polyurea waterproof coating, characterized in that: The invention comprises a polyurea emulsion, a functional additive and a modifying auxiliary agent; the mass ratio of the polyurea emulsion, the functional additive and the modifying auxiliary agent is (11-15): (4-7): 3; wherein the polyurea emulsion is prepared by the preparation method of Example 1 in CN118620503B.

2. The transparent weather-resistant polyurea waterproof coating according to claim 1, characterized in that: The preparation method of the functional additive is S01: 3-5 parts of nano zinc oxide, 1-2 parts of nano titanium oxide and 2-4 parts of yttrium nitrate solution are mixed and added into 5-8 parts of 6% sodium citrate solution and stirred evenly to obtain functional liquid A; Add 2-5 parts of fumed silica and 3-6 parts of calcium sulfate whiskers to 5-8 parts of 4% by mass lanthanum chloride solution and stir evenly to obtain functional liquid B; Functional liquid A and functional liquid B were ultrasonically modified in a weight ratio of 5:3 to obtain a functional modifier; S02: adding nano-alumina to the sodium alginate solution in a weight ratio of 3:5 and stirring evenly to obtain a nano-alumina solution; S03: The nano-alumina liquid and the functional modifier are mixed in a weight ratio of 5:3 and ball-milled at a ball-milling speed of 1000 r / min for 2 h. After the ball-milling is completed, the mixture is filtered and dried to obtain the functional additive.

3. The transparent weather-resistant polyurea waterproof coating according to claim 2, characterized in that: The mass fraction of the yttrium nitrate solution is 2-5%; the mass fraction of the sodium alginate solution is 5-9%.

4. The transparent weather-resistant polyurea waterproof coating according to claim 2, characterized in that: The ultrasonic modification treatment is performed at an ultrasonic power of 350-400W and the ultrasonic treatment is performed for 1 hour.

5. The transparent weather-resistant polyurea waterproof coating according to claim 2, characterized in that: The preparation method of the modified additive is: S11: 3-5 parts of chitosan solution, 1-2 parts of silane coupling agent KH560, 5-8 parts of clay, and 4-7 parts of sodium dodecylbenzenesulfonate solution are uniformly mixed to obtain an additive solution; S12: preheating the glass microbeads at 70-80°C for 20-30 minutes, and then cooling to room temperature. The glass microbeads cooled to room temperature and the additive liquid are mixed in a weight ratio of 5:3 and ball-milled. After the ball milling is completed, the modified additive is obtained.

6. The transparent weather-resistant polyurea waterproof coating according to claim 5, characterized in that: The mass fraction of the chitosan solution is 3-5%; the mass fraction of the sodium dodecylbenzenesulfonate solution is 2-5%.

7. The transparent weather-resistant polyurea waterproof coating according to claim 5, characterized in that: The mixing and ball milling treatment is performed at a ball milling speed of 1000-1500 r / min for 2 hours.

8. The transparent weather-resistant polyurea waterproof coating according to claim 5, characterized in that: The preparation method of the polyurea waterproof coating comprises the following steps: weighing raw materials according to parts by weight, and mixing the raw materials uniformly to obtain the waterproof coating.

9. The transparent weather-resistant polyurea waterproof coating according to claim 8, characterized in that: The mixing speed is 650-750 r / min, and the mixing time is 1 hour.

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