High-performance single-component polyurethane waterproof coating and preparation method thereof

Abstract

The invention discloses a high-performance single-component polyurethane waterproof coating and a preparation method thereof, and the high-performance single-component polyurethane waterproof coating comprises the following components in parts by weight: polyether A, polyether B, an adipic acid polyester plasticizer, a filler, powder, isocyanate, an auxiliary agent A, a catalyst, an auxiliary agent B and a solvent. The auxiliary agent A is 2, 3-dihydroxysuccinic acid or o-hydroxybenzoic acid. The filler is one or two of talcum powder or heavy calcium carbonate. The powder material is nano titanium dioxide. According to the single-component polyurethane waterproof coating adopting a moisture curing system, the coating film has high strength and extensibility, slight base displacement can be resisted, the single component is convenient to use, and working hours are saved; and the extensibility of the coating can be improved by selecting high-functionality and high-molecular-weight polyether. The polyurethane material is a waterproof material, is compact in film formation, and has excellent waterproof performance.

Description

Technical Field

[0001] The invention relates to a polyurethane waterproof coating, and in particular to a high-performance single-component polyurethane waterproof coating and a preparation method thereof. Background Art

[0002] At present, waterproofing has always been a focus of attention in projects such as buildings, bridges, and tunnels. Traditional waterproof materials have problems such as poor waterproof performance, poor durability, and complex construction. Polyurethane waterproof materials have been widely used in waterproof projects because of their good flexibility, adhesion, and waterproof performance. However, existing polyurethane waterproof materials still have some shortcomings, such as weather resistance needs to be improved and insufficient stability in complex environments. Commercially available polyurethane waterproof coatings have poor weather resistance, and the stability of the material cannot be guaranteed when exposed for a long time. Summary of the invention

[0003] Based on the above description, the present invention provides a high-performance one-component polyurethane waterproof coating and a preparation method thereof to solve the problems of poor weather resistance and insufficient stability of existing polyurethane waterproof materials in complex environments.

[0004] The technical solution of the present invention to solve the above technical problems is as follows: A high-performance one-component polyurethane waterproof coating, wherein the formula of the high-performance one-component polyurethane waterproof coating is as follows: polyether A: 150-200 parts; Polyether B: 50-100 parts; Adipic acid polyester plasticizer: 120~200 parts; Filler: 40~100 parts; Powder: 40~100 portions; Isocyanate: 40~80 parts; Additive A: 10~15 parts; Catalyst: 5~10 parts; Additive B: 10~15 parts; Solvent: 50~75 parts.

[0005] Based on the above technical solution, the present invention can also be improved as follows.

[0006] Furthermore, in the above-mentioned high-performance one-component polyurethane waterproof coating, the polyether A has a functionality of 2 and a molecular weight of 2000; the polyether B has a functionality of 2-3 and a molecular weight of 3000-5000.

[0007] Furthermore, in the above-mentioned high-performance one-component polyurethane waterproof coating, the auxiliary agent A is 2,3-dihydroxysuccinic acid or o-hydroxybenzoic acid.

[0008] Furthermore, in the above-mentioned high-performance one-component polyurethane waterproof coating, the filler is one or both of talcum powder and heavy calcium carbonate.

[0009] Furthermore, in the above-mentioned high-performance one-component polyurethane waterproof coating, the powder is nano titanium dioxide.

[0010] Furthermore, in the above-mentioned high-performance one-component polyurethane waterproof coating, the catalyst is an organic tin catalyst.

[0011] Furthermore, in the above-mentioned high-performance one-component polyurethane waterproof coating, the auxiliary agent B is an aldimine type curing agent.

[0012] Furthermore, in the above-mentioned high-performance one-component polyurethane waterproof coating, the solvent is an organic solvent.

[0013] The invention also provides a preparation method of a high-performance one-component polyurethane waterproof coating. The materials are prepared according to the formula of the high-performance one-component polyurethane waterproof coating, polyether A and polyether B are measured and added into a stirring kettle, the stirrer is started, the speed is greater than 25 Hz, adipic acid polyester plasticizer and auxiliary agent A are added when the temperature is raised to 55-65° C., the speed remains unchanged, the temperature is further raised to 75-85° C., fillers and powder are added, and the speed is set to greater than 35 Hz, the temperature is raised to 105-115° C. after stirring for 25-35 minutes, and dehydrated for 4-4.5 hours at -0.090-0.1 MPa, then the temperature is lowered, isocyanate is added, the reaction is carried out at 75-85° C. for 2-2.5 hours, and finally a catalyst, auxiliary agent B and a solvent are added at 65-75° C., the temperature is lowered to below 60° C. after stirring for 1-1.5 hours at a vacuum degree of -0.075-0.085 MPa, and the material can be discharged only after passing the test.

[0014] Furthermore, in the preparation method of the above-mentioned high-performance one-component polyurethane waterproof coating, polyether A and polyether B are measured, added into a stirring kettle, and the stirrer is started with a speed of >25 Hz. When the temperature is raised to 60°C, adipic acid polyester plasticizer and auxiliary agent A are added, and the speed remains unchanged, and the temperature is continued to be raised to 80°C, fillers and powders are added, and the speed is set to >35 Hz. After stirring for 30 minutes, the temperature is raised to 110°C and dehydrated for 4 hours at -0.095 MPa, and then the temperature is lowered, isocyanate is added and reacted at 80°C for 2 hours, and finally a catalyst, auxiliary agent B, and solvent are added at 70°C. After stirring for 1 hour under a vacuum degree of -0.080 MPa, the temperature is lowered to 60°C and the material can be discharged only after passing the test.

[0015] Compared with the prior art, the technical solution of the present invention has the following beneficial technical effects: The present invention adopts adipic acid polyester plasticizer and nano titanium dioxide powder. The use of plasticizer can improve the adhesion between polyurethane and substrate, make the coating adhere to various substrates more effectively, and reduce the risk of falling off and peeling. Adipic acid polyester plasticizer has better environmental protection performance, reduces the release of volatile organic compounds (VOC), and can improve the flexibility and elasticity of polyurethane coatings, reduce the risk of brittle cracking of the coating under temperature changes or external forces, thereby extending the service life of the coating. Nano titanium dioxide has excellent light stability and weather resistance, can effectively resist ultraviolet radiation, reduce aging and degradation of the coating, and maintain color and performance stability. At the same time, nano titanium dioxide has photocatalytic properties under ultraviolet radiation, can degrade organic pollutants, give the coating a self-cleaning function, and reduce the adhesion of surface dirt.

[0016] The present invention is a one-component polyurethane waterproof coating using a moisture curing system, which provides a high strength and elongation of the coating film and can resist slight displacement of the base layer; the single component is easy to use and saves work time; the use of high-functionality, high-molecular-weight polyether can improve the elongation of the coating. The polyurethane material is a waterproof material, which forms a dense film and has excellent waterproof performance. DETAILED DESCRIPTION

[0017] In order to facilitate understanding of the present application, the present application will be described more comprehensively below. The present application can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present application more thorough and comprehensive.

[0018] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0019] The raw materials mentioned in the present invention, which are not described in detail, can all be purchased commercially, and the test methods not described in detail all adopt the conventional test methods in the art.

[0020] The solid content of the present invention is calculated as follows: total mass of components excluding the solvent / total mass of all components*100%.

[0021] A high-performance one-component polyurethane waterproof coating, wherein the formula of the high-performance one-component polyurethane waterproof coating is as follows: polyether A: 150-200 parts; Polyether B: 50-100 parts; Adipic acid polyester plasticizer: 120~200 parts; Filler: 40~100 parts; Powder: 40~100 portions; Isocyanate: 40~80 parts; Additive A: 10~15 parts; Catalyst: 5~10 parts; Additive B: 10~15 parts; Solvent: 50~75 parts.

[0022] Based on the above technical solution, the present invention can also be improved as follows.

[0023] Furthermore, in the above-mentioned high-performance one-component polyurethane waterproof coating, the polyether A has a functionality of 2 and a molecular weight of 2000; the polyether B has a functionality of 2-3 and a molecular weight of 3000-5000.

[0024] Furthermore, in the above-mentioned high-performance one-component polyurethane waterproof coating, the auxiliary agent A is 2,3-dihydroxysuccinic acid or o-hydroxybenzoic acid.

[0025] Furthermore, in the above-mentioned high-performance one-component polyurethane waterproof coating, the filler is one or both of talcum powder and heavy calcium carbonate.

[0026] Furthermore, in the above-mentioned high-performance one-component polyurethane waterproof coating, the powder is nano titanium dioxide.

[0027] Furthermore, in the above-mentioned high-performance one-component polyurethane waterproof coating, the catalyst is an organic tin catalyst.

[0028] Furthermore, in the above-mentioned high-performance one-component polyurethane waterproof coating, the auxiliary agent B is an aldimine type curing agent.

[0029] Furthermore, in the above-mentioned high-performance one-component polyurethane waterproof coating, the solvent is an organic solvent.

[0030] The invention also provides a preparation method of a high-performance one-component polyurethane waterproof coating. The materials are prepared according to the formula of the high-performance one-component polyurethane waterproof coating, polyether A and polyether B are measured and added into a stirring kettle, the stirrer is started, the speed is greater than 25 Hz, adipic acid polyester plasticizer and auxiliary agent A are added when the temperature is raised to 55-65° C., the speed remains unchanged, the temperature is further raised to 75-85° C., fillers and powder are added, and the speed is set to greater than 35 Hz, the temperature is raised to 105-115° C. after stirring for 25-35 minutes, and dehydrated for 4-4.5 hours at -0.090-0.1 MPa, then the temperature is lowered, isocyanate is added, the reaction is carried out at 75-85° C. for 2-2.5 hours, and finally a catalyst, auxiliary agent B and a solvent are added at 65-75° C., the temperature is lowered to below 60° C. after stirring for 1-1.5 hours at a vacuum degree of -0.075-0.085 MPa, and the material can be discharged only after passing the test.

[0031] Furthermore, in the preparation method of the above-mentioned high-performance one-component polyurethane waterproof coating, polyether A and polyether B are measured, added into a stirring kettle, and the stirrer is started with a speed of >25 Hz. When the temperature is raised to 60°C, adipic acid polyester plasticizer and auxiliary agent A are added, and the speed remains unchanged, and the temperature is continued to be raised to 80°C, fillers and powders are added, and the speed is set to >35 Hz. After stirring for 30 minutes, the temperature is raised to 110°C and dehydrated for 4 hours at -0.095 MPa, and then the temperature is lowered, isocyanate is added and reacted at 80°C for 2 hours, and finally a catalyst, auxiliary agent B, and solvent are added at 70°C. After stirring for 1 hour under a vacuum degree of -0.080 MPa, the temperature is lowered to 60°C and the material can be discharged only after passing the test.

[0032] Example 1 The specific technical scheme of the present invention is as follows: A high-performance one-component polyurethane waterproof coating, the formula of the high-performance one-component polyurethane waterproof coating is, by weight, Polyether A: 150 parts; Polyether B: 50 parts; Adipic acid polyester plasticizer: 120 parts; Filling: 40 parts; Nano titanium dioxide: 40 parts; Isocyanate: 40 parts; Auxiliary agent A: 10 parts; Catalyst: 5 parts; Additive B: 10 parts; Solvent: 57 parts.

[0033] Prepare materials according to the formula of high-performance one-component polyurethane waterproof coating, measure polyether A and polyether B, add into the stirring kettle, start the stirrer, speed>25Hz, add adipic acid polyester plasticizer and auxiliary agent A when the temperature reaches 60℃, keep the speed unchanged, continue to heat up to 80℃, add filler and nano titanium dioxide, and set the speed to>35Hz. After stirring for 30min, heat to 110℃ and dehydrate for 4h at -0.095MPa, then cool, add isocyanate and react at 80℃ for 2h, finally add catalyst, auxiliary agent B and solvent at 70℃, stir for 1h under vacuum at -0.080MPa, cool to 60℃ and discharge after passing the test.

[0034] In order to test the performance of the polyurethane coating of this embodiment, the present invention compares the performance of the standard coating, the high-performance one-component polyurethane coating of the present invention, and the conventional polyurethane coating (without adipic acid polyester and nano-titanium dioxide), and the test data are as follows: Table 1 Performance comparison of standard coating, high performance one-component polyurethane coating of the present invention and conventional polyurethane coating

[0035] As can be seen from Table 1, all properties of the coating of Example 1 of the present invention meet the standard requirements. At the same time, under the premise that the solid content is lower than that of conventional polyurethane coatings, the tensile strength, fracture aging and bonding strength of Example 1 of the present invention are higher than those of conventional polyurethane coatings, and the water impermeability and low-temperature bending properties are good. In addition, the surface drying time and actual drying time of the polyurethane coating of Example 1 of the present invention are significantly shorter than those of conventional polyurethane coatings. As for artificial weathering performance, the tensile strength retention rate and elongation at break of the present invention are significantly higher than those of conventional polyurethane coatings.

[0036] The above test data show that adding adipic acid polyester plasticizer and nano titanium dioxide into the formula to produce a single-component polyurethane waterproof coating can meet the Type I requirements of GB / T19250-2013 "Polyurethane Waterproof Coating" standard.

[0037] Example 2 This embodiment is basically the same as embodiment 1, except that the formula of the high-performance one-component polyurethane waterproof coating is: Polyether A: 175 parts; Polyether B: 75 parts; Adipic acid polyester plasticizer: 175 parts; Filler: 75 parts; Nano titanium dioxide: 75 parts; Isocyanate: 65 parts; Auxiliary agent A: 12 parts; Catalyst: 8 parts; Auxiliary agent B: 12 ​​parts; Solvent: 65 parts.

[0038] Prepare materials according to the formula of high-performance one-component polyurethane waterproof coating, measure polyether A and polyether B, add into the stirring kettle, start the stirrer, speed>25Hz, add adipic acid polyester plasticizer and auxiliary agent A when the temperature reaches 55℃, keep the speed unchanged, continue to heat up to 75℃, add filler and powder, and set the speed to>35Hz, stir for 25min, heat to 105℃, dehydrate for 4h at -0.090MPa, then cool, add isocyanate, react at 75℃ for 2h, finally add catalyst, auxiliary agent B, solvent at 65℃, stir for 1h under vacuum at -0.075MPa, cool to below 60℃ and discharge after passing the test.

[0039] Example 3 This embodiment is basically the same as embodiment 1, except that the formula of the high-performance one-component polyurethane waterproof coating is: Polyether A: 200 parts; Polyether B: 100 parts; Adipic acid polyester plasticizer: 200 parts; Filler: 100 parts; Nano titanium dioxide: 100 parts; Isocyanate: 80 parts; Auxiliary agent A: 15 parts; Catalyst: 10 parts; Additive B: 15 parts; Solvent: 75 parts.

[0040] Prepare materials according to the formula of high-performance one-component polyurethane waterproof coating, measure polyether A and polyether B, add into the stirring kettle, start the stirrer, speed>25Hz, add adipic acid polyester plasticizer and auxiliary A when the temperature reaches 65℃, keep the speed unchanged, continue to heat to 85℃, add filler and powder, and set the speed to>35Hz, stir for 35min, then heat to 115℃, dehydrate for 4.5h at -0.1MPa, then cool, add isocyanate, react at 85℃ for 2.5h, finally add catalyst, auxiliary B, solvent at 75℃, stir for 1.5h at vacuum degree -0.085MPa, cool to below 60℃ and discharge after passing the test.

[0041] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

[0042] When used herein, the singular forms "a", "an", and "said / the" may also include plural forms, unless the context clearly indicates otherwise. It should also be understood that the terms "include / comprise" or "have" etc. specify the presence of stated features, wholes, steps, operations, components, parts or combinations thereof, but do not exclude the possibility of the presence or addition of one or more other features, wholes, steps, operations, components, parts or combinations thereof.

Claims

1. A high-performance one-component polyurethane waterproof coating, characterized in that: The formula of the high-performance one-component polyurethane waterproof coating is, by weight, polyether A: 150-200 parts; Polyether B: 50-100 parts; Adipic acid polyester plasticizer: 120~200 parts; Filler: 40~100 parts; Powder: 40~100 portions; Isocyanate: 40~80 parts; Additive A: 10~15 parts; Catalyst: 5~10 parts; Additive B: 10~15 parts; Solvent: 50~75 parts.

2. A high-performance one-component polyurethane waterproof coating according to claim 1, characterized in that: The polyether A has a functionality of 2 and a molecular weight of 2000; the polyether B has a functionality of 2-3 and a molecular weight of 3000-5000.

3. A high-performance one-component polyurethane waterproof coating according to claim 1, characterized in that: The auxiliary agent A is 2,3-dihydroxysuccinic acid or o-hydroxybenzoic acid.

4. A high performance one-component polyurethane waterproof coating according to claim 1, characterized in that: The filler is one or both of talc powder and heavy calcium carbonate.

5. The high-performance one-component polyurethane waterproof coating according to claim 1, characterized in that: The powder is nano titanium dioxide.

6. A high performance one-component polyurethane waterproof coating according to claim 1, characterized in that: The catalyst is an organotin catalyst.

7. The high-performance one-component polyurethane waterproof coating according to claim 1, characterized in that: The auxiliary agent B is an aldimine type curing agent.

8. The high-performance one-component polyurethane waterproof coating according to claim 1, characterized in that: The solvent is an organic solvent.

9. The method for preparing a high-performance one-component polyurethane waterproof coating according to any one of claims 1 to 8, characterized in that: Prepare the materials according to the formula of high-performance one-component polyurethane waterproof coating, measure polyether A and polyether B, add into the stirring kettle, start the stirrer, speed>25Hz, add adipic acid polyester plasticizer and auxiliary agent A when the temperature rises to 55~65℃, keep the speed unchanged, continue to heat up to 75~85℃, add filler and powder, and set the speed to>35Hz. After stirring for 25~35min, heat to 105~115℃ and dehydrate at -0.090~-0.1MPa for 4~4.5h, then cool down, add isocyanate and react at 75~85℃ for 2~2.5h, finally add catalyst, auxiliary agent B and solvent at 65~75℃, stir for 1~1.5h under vacuum degree of -0.075~-0.085MPa, cool down to below 60℃ and discharge the materials after passing the test.

10. The method for preparing a high-performance one-component polyurethane waterproof coating according to claim 9, characterized in that: Measure polyether A and polyether B, add them into the stirring kettle, start the stirrer with a speed of >25Hz, add adipic acid polyester plasticizer and auxiliary A when the temperature reaches 60℃, keep the speed unchanged, continue to heat up to 80℃, add filler and powder, and set the speed to >35Hz. After stirring for 30min, heat to 110℃ and dehydrate for 4h at -0.095MPa, then cool down, add isocyanate and react at 80℃ for 2h, finally add catalyst, auxiliary B and solvent at 70℃, stir for 1h under vacuum at -0.080MPa, cool down to 60℃ and discharge after passing the test.

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