A high-performance waterproof and UV-resistant polymer coating and its preparation method

Abstract

This invention relates to the field of coating technology and discloses a high-performance waterproof and UV-resistant polymer coating and its preparation method. This coating uses acrylic resin emulsion as the film-forming substance and pigments, defoamers, leveling agents, etc., as auxiliary materials, which are mixed to form the coating. The acrylic resin emulsion is prepared by cross-linking and polymerizing a polymeric macromolecular functional crosslinking agent with acrylic resin monomers. This method results in a high crosslinking density of the acrylic resin molecular chains, giving the coating a high structural density and improving its waterproof performance. Furthermore, because the functional crosslinking agent structure also contains silicon-oxygen bonds and rigid pyrene rings, it can further enhance the coating's waterproof performance by improving the coating's hydrophobicity, while the presence of rigid pyrene rings can give the coating higher mechanical properties. In addition, the functional crosslinking agent structure also contains a benzophenone UV-absorbing structure, which can effectively enhance the coating's UV resistance.

Description

Technical Field

[0001] This invention relates to the field of coating technology, specifically to a high-performance waterproof and UV-resistant polymer coating and its preparation method. Background Technology

[0002] In modern architecture, coatings are an indispensable building material, playing multiple roles such as waterproofing, aesthetics, and decoration. Traditional cement-based coatings are difficult to apply and are prone to cracking after drying, making it difficult to meet waterproofing requirements. In contrast, polymer coatings are relatively easy to apply and are therefore gradually replacing traditional cement-based coatings.

[0003] Among the many types of polymer coatings, acrylic resin coatings have rapidly become the mainstream protective material in the industrial and construction fields due to their excellent chemical stability, gloss retention, and decorative properties. However, with the expansion of application scenarios, their shortcomings in waterproofing and UV resistance have gradually become apparent, directly affecting the service life and protective effect of the coating.

[0004] Existing technologies generally improve the UV resistance and other properties of acrylic resin coatings by adding inorganic additives such as nano-titanium dioxide and zinc oxide. However, due to the severe interfacial problems between the inorganic materials and the acrylic resin matrix, the nanomaterials cannot be uniformly dispersed, making it difficult to produce an effective reinforcing and modifying effect. Conventional small-molecule UV absorbers also have the problem of easy precipitation and migration, making it difficult to ensure the long-term UV resistance of the coating. Based on this, the present invention provides a polymer coating with good comprehensive performance, which can solve the problems existing in the prior art. Summary of the Invention

[0005] (a) Technical problems to be solved

[0006] To address the shortcomings of existing technologies, this invention provides a high-performance waterproof and UV-resistant polymer coating and its preparation method.

[0007] (II) Technical Solution

[0008] A high-performance waterproof and UV-resistant polymer coating is made from the following raw materials measured in parts by weight:

[0009] 40-65 parts acrylic resin emulsion, 3-5 parts colorant, 0.5-1.5 parts defoamer, 0.5-1.5 parts leveling agent, 0.5-1 part film-forming aid, 1-4 parts thickener, and 25-45 parts deionized water;

[0010] The preparation method of the acrylic resin emulsion includes the following steps:

[0011] Step 1: Add methyl methacrylate, isooctyl acrylate, hydroxyethyl acrylate, functional crosslinking agent, and emulsifier to deionized water. After the addition is complete, stir and mix evenly at a speed of 100-200 r / min to form a pre-emulsion.

[0012] Step 2: Raise the temperature to 65-75℃, then add the initiator to the pre-emulsion and stir until evenly mixed. Then raise the temperature to 78-82℃ and continue stirring for 12-18 hours. Stop heating, cool down and discharge the material to obtain the acrylic resin emulsion.

[0013] As a further embodiment of the present invention, the colorant is any one of carbon black, titanium dioxide, or calcium carbonate; the defoamer is BYK-085 or BYK-052N; the leveling agent is BYK-315N or BYK-310; the film-forming aid is propylene glycol methyl ether; and the thickener is sodium hydroxyethyl cellulose.

[0014] As a further embodiment of the present invention, the mass ratio of methyl methacrylate, isooctyl acrylate, hydroxyethyl acrylate, functional crosslinking agent, emulsifier, deionized water and initiator is 40-50:10-20:5-15:1-2:2-3:120-150:0.5-1.5.

[0015] As a further aspect of the present invention, the preparation method of the functional crosslinking agent includes the following steps:

[0016] Step S1: 3-(3-pyrene)propyldimethylchlorosilane and 3-[bis(glycidoxymethyl)methoxy]-1,2-propanediol were added to toluene, and stirring was started. After a homogeneous reaction solution was formed, an acid-binding agent was added to the reaction solution. Then the temperature was raised to 70-80℃ and kept at that temperature for 3-6 hours. The solvent was evaporated and removed. After purification, the pyrene ring derivative was obtained.

[0017] Step S2: Add 2,4,4'-trihydroxybenzophenone and the pyrene ring derivative to N,N-dimethylformamide and stir until a homogeneous reaction solution is formed. Purge with nitrogen for protection, then add a phase transfer catalyst to the reaction solution. After the addition is complete, heat to 100-120℃ and continue stirring for 8-16 hours. Then add the end-capping agent. After the addition is complete, keep the solution at this temperature for 1-2 hours, remove the nitrogen, evaporate the solvent, cool down and discharge the product to obtain the functional crosslinking agent.

[0018] As a further aspect of the present invention, in step S1, the molar ratio of 3-(3-pyrene)propyldimethylchlorosilane and 3-[bis(glycidoxymethyl)methoxy]-1,2-propanediol is 1-2:1.

[0019] As a further aspect of the present invention, in step S1, the acid-binding agent is triethylamine.

[0020] As a further aspect of the present invention, in step S2, the molar ratio of 2,4,4'-trihydroxybenzophenone and the pyrene ring derivative is 1:0.8-0.9.

[0021] As a further aspect of the present invention, in step S2, the phase transfer catalyst is a boron trifluoride diethyl ether complex.

[0022] As a further embodiment of the present invention, in step S2, the capping agent is acryloyl chloride or methacryloyl chloride.

[0023] In the above technical solution, 3-(3-pyrene)propyldimethylchlorosilane and 3-[bis(glycidoxymethyl)methoxy]-1,2-propanediol are first used as raw materials. Through the substitution reaction between Si-Cl and active hydroxyl groups in their respective structures, a pyrene ring derivative containing two equivalent active epoxy groups is obtained. Then, under the action of a phase transfer catalyst, the epoxy groups in its structure can undergo a continuous ring-opening addition reaction with the para-hydroxyl group in the 2,4,4'-trihydroxybenzophenone structure to obtain a polymeric macromolecule with pyrene ring-benzophenone UV-absorbing functional groups linked by ether bonds. Finally, by using a capping agent containing alkenyl substituents to cap it, an unsaturated alkenyl-capped polymeric macromolecular functional crosslinking agent can be obtained.

[0024] A method for preparing a high-performance waterproof and UV-resistant polymer coating includes the following steps:

[0025] Step 1: After weighing and preparing all the raw materials, first add the acrylic resin emulsion, colorant, leveling agent, film-forming aid, and thickener to deionized water, and mechanically stir at a stirring rate of 800-1000 r / min for 20-40 minutes to form a mixture.

[0026] The second step is to add defoamer to the mixture. After adding the defoamer, adjust the stirring speed to 200-300 r / min and continue stirring for 10-30 minutes. Then stop stirring and let it stand to defoam.

[0027] (iii) Beneficial technical effects

[0028] This invention prepares a polymeric macromolecular functional crosslinking agent, which is then crosslinked with acrylic resin monomers. On one hand, this increases the crosslinking density of the acrylic resin molecular chains, thereby improving the structural density of the cured thick coating and extending the water penetration path, thus enhancing the coating's waterproof performance. On the other hand, the functional crosslinking agent structure also contains strongly hydrophobic silicon-oxygen bonds generated by substitution reactions, as well as rigid pyrene rings. This enhances the coating's hydrophobicity, creating a superhydrophobic effect and further strengthening its waterproof performance. The rigid pyrene rings also contribute to the coating's superior mechanical properties. Furthermore, the functional crosslinking agent structure contains a benzophenone UV-absorbing structure, effectively enhancing the coating's UV resistance. Due to the chemical crosslinking process, this benzophenone is confined within the coating, preventing easy migration and volatilization, thus ensuring the coating's long-lasting UV resistance. Detailed Implementation

[0029] To facilitate understanding of the present invention, a more complete description will be provided below. Preferred embodiments of the invention are given below. However, the invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a thorough and complete understanding of the disclosure of the invention.

[0030] A high-performance waterproof and UV-resistant polymer coating is made from the following raw materials measured in parts by weight:

[0031] 40 parts acrylic resin emulsion, 3 parts calcium carbonate pigment, 0.5 parts defoamer BYK-085, 0.5 parts leveling agent BYK-315N, 0.5 parts film-forming aid propylene glycol methyl ether, 1 part thickener sodium hydroxyethyl cellulose, and 25 parts deionized water.

[0032] The preparation method of the coating includes the following steps:

[0033] Step 1: After weighing and preparing all the raw materials, first add the acrylic resin emulsion, colorant calcium carbonate, leveling agent BYK-315N, film-forming aid propylene glycol methyl ether, and thickener sodium hydroxyethyl cellulose to deionized water, and mechanically stir at a stirring rate of 800 r / min for 40 min to form a mixture.

[0034] Step 2: Add defoamer BYK-085 to the mixture. After adding, adjust the stirring speed to 200 r / min and continue stirring for 30 minutes. Then stop stirring and let it stand to defoam.

[0035] The preparation method of the acrylic resin emulsion includes the following steps:

[0036] Step 1: Add 45g methyl methacrylate, 12g isooctyl acrylate, 8g hydroxyethyl acrylate, 1.5g functional crosslinking agent, and 2g emulsifier OP-10 to 150mL of deionized water. After the addition is complete, stir and mix evenly at 200r / min to form a pre-emulsion.

[0037] Step 2: Raise the temperature to 70℃, then add 0.6g of potassium persulfate initiator to the pre-emulsion, stir and mix evenly, then raise the temperature to 82℃, keep it warm and stir for 16 hours, stop heating, cool down and discharge the material to obtain acrylic resin emulsion.

[0038] The preparation method of the functional crosslinking agent includes the following steps:

[0039] Step S1: 0.2 g of 3-(3-pyrene)propyldimethylchlorosilane and 0.83 g of 3-[bis(glycidoxymethyl)methoxy]-1,2-propanediol] were added to toluene. Stirring was started to form a homogeneous reaction solution. Then, 0.01 g of triethylamine was added to the reaction solution. The temperature was then raised to 75°C and kept at that temperature for 2 hours. The solvent was evaporated and removed. After purification, the pyrene ring derivative was obtained.

[0040] Step S2: Add 0.5g of 2,4,4'-trihydroxybenzophenone and 1.6g of pyrene ring derivative to N,N-dimethylformamide, stir and mix until a homogeneous reaction solution is formed, and then purge with nitrogen for protection. Next, add 0.1g of boron trifluoride diethyl ether complex to the reaction solution. After the addition is complete, heat to 110℃ and continue stirring for 9 hours. Then, add 0.2g of acryloyl chloride. After the addition is complete, keep the solution at this temperature for 1 hour, remove the nitrogen, evaporate the solvent, cool down and discharge the product to obtain the functional crosslinking agent.

[0041] A high-performance waterproof and UV-resistant polymer coating is made from the following raw materials measured in parts by weight:

[0042] 60 parts acrylic resin emulsion, 4 parts calcium carbonate pigment, 1 part defoamer BYK-052N, 1 part leveling agent BYK-310, 0.8 parts film-forming aid propylene glycol methyl ether, 3 parts thickener sodium hydroxyethyl cellulose, and 40 parts deionized water.

[0043] The preparation method of the coating includes the following steps:

[0044] Step 1: After weighing and preparing all the raw materials, first add the acrylic resin emulsion, colorant calcium carbonate, leveling agent BYK-310, film-forming aid propylene glycol methyl ether, and thickener sodium hydroxyethyl cellulose to deionized water, and mechanically stir at a stirring rate of 1000 r / min for 30 min to form a mixture.

[0045] Step 2: Add defoamer BYK-052N to the mixture. After adding, adjust the stirring speed to 300 r / min and continue stirring for 20 minutes. Then stop stirring and let it stand to defoam.

[0046] The preparation method of the acrylic resin emulsion is the same as that in Example 1.

[0047] A high-performance waterproof and UV-resistant polymer coating is made from the following raw materials measured in parts by weight:

[0048] 65 parts acrylic resin emulsion, 5 parts calcium carbonate pigment, 1.5 parts defoamer BYK-052N, 1.5 parts leveling agent BYK-310, 1 part film-forming aid propylene glycol methyl ether, 4 parts thickener sodium hydroxyethyl cellulose, and 45 parts deionized water.

[0049] The preparation method of the coating includes the following steps:

[0050] Step 1: After weighing and preparing all the raw materials, first add the acrylic resin emulsion, colorant calcium carbonate, leveling agent BYK-310, film-forming aid propylene glycol methyl ether, and thickener sodium hydroxyethyl cellulose to deionized water, and mechanically stir at a stirring rate of 1000 r / min for 20 min to form a mixture.

[0051] Step 2: Add defoamer BYK-052N to the mixture. After adding, adjust the stirring speed to 300 r / min and continue stirring for 10 minutes. Then stop stirring and let it stand to defoam.

[0052] The preparation method of the acrylic resin emulsion is the same as that in Example 1.

[0053] Comparative Example 1

[0054] A high-performance waterproof and UV-resistant polymer coating is made from the following raw materials measured in parts by weight:

[0055] 60 parts acrylic resin emulsion, 4 parts calcium carbonate pigment, 1 part defoamer BYK-052N, 1 part leveling agent BYK-310, 0.8 parts film-forming aid propylene glycol methyl ether, 3 parts thickener sodium hydroxyethyl cellulose, and 40 parts deionized water.

[0056] The preparation method of the coating includes the following steps:

[0057] Step 1: After weighing and preparing all the raw materials, first add the acrylic resin emulsion, colorant calcium carbonate, leveling agent BYK-310, film-forming aid propylene glycol methyl ether, and thickener sodium hydroxyethyl cellulose to deionized water, and mechanically stir at a stirring rate of 1000 r / min for 30 min to form a mixture.

[0058] Step 2: Add defoamer BYK-052N to the mixture. After adding, adjust the stirring speed to 300 r / min and continue stirring for 20 minutes. Then stop stirring and let it stand to defoam.

[0059] The preparation method of the acrylic resin emulsion differs from that in Example 1 in that the functional crosslinking agent is replaced with the conventional crosslinking agent N,N-methyleneacrylamide, while the rest are the same.

[0060] Comparative Example 2

[0061] A high-performance waterproof and UV-resistant polymer coating is made from the following raw materials measured in parts by weight:

[0062] 60 parts acrylic resin emulsion, 4 parts calcium carbonate pigment, 1 part defoamer BYK-052N, 1 part leveling agent BYK-310, 0.8 parts film-forming aid propylene glycol methyl ether, 3 parts thickener sodium hydroxyethyl cellulose, and 40 parts deionized water.

[0063] The preparation method of the coating includes the following steps:

[0064] Step 1: After weighing and preparing all the raw materials, first add the acrylic resin emulsion, colorant calcium carbonate, leveling agent BYK-310, film-forming aid propylene glycol methyl ether, and thickener sodium hydroxyethyl cellulose to deionized water, and mechanically stir at a stirring rate of 1000 r / min for 30 min to form a mixture.

[0065] Step 2: Add defoamer BYK-052N to the mixture. After adding, adjust the stirring speed to 300 r / min and continue stirring for 20 minutes. Then stop stirring and let it stand to defoam.

[0066] The preparation method of the acrylic resin emulsion differs from that in Example 1 in that the functional crosslinking agent is removed, while the rest are the same.

[0067] Performance testing

[0068] The coatings used in the examples and comparative examples were prepared into coatings that met the test specifications, and various performance tests were conducted.

[0069] According to standard GB / T 2409-1980, the coating was placed in a xenon lamp aging tester and accelerated for 800 hours. The yellow index of the coating was tested to evaluate the UV resistance of the coating.

[0070] According to standard GB / T 6739-2022, the pencil hardness of the coating was tested;

[0071] According to standard GB / T 16777-2008, the waterproof performance of the coating was tested at a pressure of 0.5 MPa for 2 hours.

[0072] The test results are shown in the table below:

[0073] ;

[0074] According to the test results, the acrylic resin coating prepared by crosslinking polymerization using functional crosslinking agent exhibits excellent UV resistance, hardness and water resistance. Although replacing the functional crosslinking agent with conventional crosslinking agent can improve the structural density of the coating, the resulting acrylic resin molecular chain does not contain rigid pyrene rings, siloxane bonds and benzophenone UV absorption structures, resulting in a significant decrease in the various properties of the coating.

[0075] This document uses specific examples to illustrate the principles and implementation methods of the present invention. The descriptions of these embodiments are merely to aid in understanding the method and core ideas of the present invention, including the best mode, and to enable any person skilled in the art to practice the present invention, including manufacturing and using any device or system, and implementing any combined method. It should be noted that those skilled in the art can make various improvements and modifications to the present invention without departing from its principles, and these improvements and modifications also fall within the scope of protection of the claims. The scope of protection of this patent is defined by the claims and may include other embodiments that can be conceived by those skilled in the art. If these other embodiments have structural elements similar to those expressed in the claims, or if they include equivalent structural elements that are not substantially different from those expressed in the claims, then these other embodiments should also be included within the scope of the claims.

[0076] Based on the preferred embodiments of the present invention, and through the above description, those skilled in the art can make various changes and modifications without departing from the inventive concept. The technical scope of this invention is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A high-performance waterproof and UV-resistant polymer coating, characterized in that, It is made from the following raw materials, measured in parts by weight: 40-65 parts acrylic resin emulsion, 3-5 parts colorant, 0.5-1.5 parts defoamer, 0.5-1.5 parts leveling agent, 0.5-1 part film-forming aid, 1-4 parts thickener, and 25-45 parts deionized water; The preparation method of the acrylic resin emulsion includes the following steps: Step 1: Add methyl methacrylate, isooctyl acrylate, hydroxyethyl acrylate, functional crosslinking agent, and emulsifier to deionized water. After the addition is complete, stir and mix evenly at a speed of 100-200 r / min to form a pre-emulsion. Step 2: Raise the temperature to 65-75℃, then add the initiator to the pre-emulsion and stir until homogeneous. Next, raise the temperature to 78-82℃ and maintain this temperature while stirring for 12-18 hours. Stop heating, cool, and discharge the material to obtain the acrylic resin emulsion. The mass ratio of methyl methacrylate, isooctyl acrylate, hydroxyethyl acrylate, functional crosslinking agent, emulsifier, deionized water, and initiator is 40-50:10-20:5-15:1-2:2-3:120-150:0.5-1.

5. The preparation method of the functional crosslinking agent includes the following steps: Step S1: 3-(3-pyrene)propyldimethylchlorosilane and 3-[bis(glycidoxymethyl)methoxy]-1,2-propanediol were added to toluene, and stirring was started. After a homogeneous reaction solution was formed, an acid-binding agent was added to the reaction solution. Then the temperature was raised to 70-80℃ and kept at that temperature for 3-6 hours. The solvent was evaporated and removed. After purification, the pyrene ring derivative was obtained. Step S2: Add 2,4,4'-trihydroxybenzophenone and the pyrene ring derivative to N,N-dimethylformamide, stir and mix until a homogeneous reaction solution is formed, purge with nitrogen for protection, then add a phase transfer catalyst to the reaction solution. After the addition is complete, heat to 100-120℃, and continue stirring at this temperature for 8-16 hours. Then add the end-capping agent. After the addition is complete, keep the solution at this temperature for 1-2 hours, remove the nitrogen, evaporate and remove the solvent, cool down and discharge the product to obtain the functional crosslinking agent. In step S1, the molar ratio of 3-(3-pyrene)propyldimethylchlorosilane and 3-[bis(glycidoxymethyl)methoxy]-1,2-propanediol is 1-2:

1.

2. The high-performance waterproof and UV-resistant polymer coating according to claim 1, characterized in that, The colorant is any one of carbon black, titanium dioxide, or calcium carbonate; the defoamer is BYK-085 or BYK-052N; the leveling agent is BYK-315N or BYK-310; the film-forming aid is propylene glycol methyl ether; and the thickener is sodium hydroxyethyl cellulose.

3. The high-performance waterproof and UV-resistant polymer coating according to claim 2, characterized in that, In step S1, the acid-binding agent is triethylamine.

4. The high-performance waterproof and UV-resistant polymer coating according to claim 3, characterized in that, In step S2, the molar ratio of 2,4,4'-trihydroxybenzophenone and the pyrene ring derivative is 1:0.8-0.

9.

5. The high-performance waterproof and UV-resistant polymer coating according to claim 4, characterized in that, In step S2, the phase transfer catalyst is a boron trifluoride diethyl ether complex.

6. The high-performance waterproof and UV-resistant polymer coating according to claim 5, characterized in that, In step S2, the capping agent is acryloyl chloride or methacryloyl chloride.

7. A method for preparing a high-performance waterproof and UV-resistant polymer coating as described in claim 1, characterized in that, Includes the following steps: Step 1: After weighing and preparing all raw materials, first add acrylic resin emulsion, colorant, leveling agent, film-forming aid, and thickener to deionized water, and mechanically stir at a stirring speed of 800-1000 r / min for 20-40 minutes to form a mixture. Step 2: Add defoamer to the mixture. After adding, adjust the stirring speed to 200-300 r / min and continue stirring for 10-30 minutes. Stop stirring and let it stand to defoam.