Titanium oxide aerogel waterborne coating, textile, preparation method and application of coating

Abstract

The invention relates to the technical field of coatings, in particular to a titanium oxide aerogel waterborne coating, a textile, a preparation method and coating application. The titanium oxide aerogel aqueous coating comprises the following components: titanium oxide aerogel powder, water-soluble resin, silk fibroin and deionized water. The prepared titanium oxide aerogel waterborne coating can be applied to textiles and sunscreen articles. The silk fibroin is added as a dispersing agent, due to the structural characteristics of the silk fibroin, the dispersing efficiency of the silk fibroin is high, a good dispersing effect can be achieved with a small adding amount, and the preparation cost of the titanium oxide aerogel waterborne coating is reduced; the problem that the mechanical property of the coating is reduced due to addition of a dispersing agent in the prior art is solved, the mechanical property of the coating is not damaged due to addition of the protein, and the mechanical property of the coating is enhanced through various interactions, so that the components of the coating can be reduced, and the cost is further reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of coatings, and particularly relates to a titanium oxide aerogel waterborne coating, a textile, a preparation method thereof, and coating applications. Background Art

[0002] Titanium oxide aerogel is a porous material with a high specific surface area, low density, and high porosity. Due to its unique physical and chemical properties, it has a wide range of applications in fields such as heat insulation, photocatalysis, and energy storage. There are various preparation methods for titanium oxide aerogel, but ultimately, drying treatment is required, such as supercritical drying technology, atmospheric pressure drying technology, etc. Supercritical drying technology can obtain aerogels with a high specific surface area and uniform pore size distribution, but the cost is relatively high. Atmospheric pressure drying technology is a relatively low-cost alternative method, usually achieved by hydrophobic modification of the aerogel surface in advance and then solvent replacement, etc. Most of the titanium oxide aerogel powders applied to coating components belong to this category.

[0003] Since the solvent of waterborne coatings is water, it is difficult for the hydrophobic modified titanium oxide aerogel powder to be uniformly dispersed inside the waterborne coating. The common solution is to add a dispersant to promote the dispersion of the aerogel powder. Currently, commercially available dispersants are generally amphiphilic polymers with a relatively low molecular weight, having a structure with one hydrophobic end and one hydrophilic end. Although they can promote the dispersion of the aerogel powder, due to the short molecular chain of the hydrophilic end, they cannot form good intermolecular interactions with the resin molecular chain through chain entanglement, resulting in a decrease in the mechanical properties of the coating. Summary of the Invention

[0004] The present invention provides a titanium oxide aerogel waterborne coating and a preparation method thereof to solve the problem of the decrease in the mechanical properties of the coating caused by adding a dispersant in the related art.

[0005] In a first aspect, the present invention provides a titanium oxide aerogel waterborne coating, comprising the following components: Titanium oxide aerogel powder, water-soluble resin, silk fibroin, and deionized water.

[0006] In some embodiments, the mass ratio of the titanium oxide aerogel powder, water-soluble resin, silk fibroin, and deionized water is 1 - 10:30 - 50:0.1 - 1:39 - 68.9.

[0007] In some embodiments, the titanium oxide aerogel is a hydrophobic titanium oxide aerogel.

[0008] In some embodiments, the particle size of the titanium oxide aerogel powder is 0.1 - 5 μm.

[0009] In some embodiments, the water-soluble resin is at least one of acrylic resin, waterborne polyurethane resin, waterborne epoxy resin, waterborne amino resin, and waterborne silicone-acrylic resin.

[0010] In a second aspect, the present invention provides a method for preparing a titanium dioxide aerogel coating, comprising the following steps: Step 1: Slowly add silk fibroin to the aqueous resin solution, and at the same time add deionized water and stir evenly to obtain a mixed solution; Step 2: Slowly add the titanium dioxide aerogel powder to the mixed solution obtained in Step 1 and stir evenly to obtain the titanium dioxide aerogel water-based coating of the present invention.

[0011] The main component of silk fibroin is the silk fibroin heavy chain, which consists of hydrophobic structural regions separated by hydrophilic segments. At the molecular level, 83% of the silk fibroin heavy chain is composed of non-polar amino acids glycine, alanine, tyrosine, and valine, while the other 14% are polar residues serine, threonine, glutamic acid, and aspartic acid. This combination endows silk fibroin with amphiphilicity. In addition, due to the long molecular chain and flexible chain of silk fibroin, it is easy to form chain entanglements with the resin polymer chains, and the alternately arranged hydrophobic and hydrophilic segments can form van der Waals forces, hydrogen bonds and other interaction forces with various groups on the resin polymer chains. Under the synergistic action of the above various factors, silk fibroin can not only promote the dispersion of titanium dioxide aerogel powder, but also improve the basic mechanical properties of the resin coating to a certain extent.

[0012] In a third aspect, the present invention provides a textile, comprising the above-mentioned titanium dioxide aerogel water-based coating and a substrate, and the titanium dioxide aerogel water-based coating is attached to the substrate.

[0013] In some embodiments, the substrate includes but is not limited to at least one of non-woven fabric, polyester fiber fabric, and polyvinyl chloride film material.

[0014] In a fourth aspect, the present invention provides a method for preparing the above-mentioned textile, comprising: Apply the titanium dioxide aerogel water-based coating on the substrate and dry it to obtain.

[0015] In a fifth aspect, the present invention provides the application of the above-mentioned titanium dioxide aerogel water-based coating, and the titanium dioxide aerogel water-based coating is used as a coating for sunscreen products.

[0016] Furthermore, the sunscreen products include building sunshade products, transportation protection products, agricultural greenhouse products, household shading products, industrial storage products, outdoor activity products, and emergency disaster relief products, etc.

[0017] The beneficial effects brought by the technical solution of this application include: 1. The present invention adds fibroin as a dispersant. Due to the structural characteristics of fibroin itself, its dispersion efficiency is relatively high, and a good dispersion effect can be achieved with a small addition amount, and the coating components can be reduced, thereby reducing the preparation cost of the titanium oxide aerogel water-based coating. 2. After adding a dispersant in the prior art to solve the dispersion problem, it often brings side effects to the mechanical properties of the coating. Therefore, additives need to be added for further improvement. However, the addition of fibroin in the present invention will not only not damage the mechanical properties of the coating, but on the contrary, it will enhance the mechanical properties and adhesion of the coating through interaction with other substances. Specific embodiments

[0018] The technical solutions of the present application will be clearly and completely described below in conjunction with the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present application without creative efforts shall fall within the scope of protection of the present application. Example 1

[0019] Step 1. Slowly add 0.1 part by mass of fibroin to 50 parts by mass of a water-soluble resin solution. The water-soluble resin in this embodiment is an aqueous silicon-acrylic resin solution (in some other embodiments, the water-soluble resin is at least one of acrylic resin, waterborne polyurethane resin, waterborne epoxy resin, waterborne amino resin, and aqueous silicon-acrylic resin). At the same time, add 68.9 parts by mass of deionized water and stir evenly to obtain a mixed solution. Step 2. Slowly add 1 part by mass of titanium oxide aerogel powder to the mixed solution obtained in Step 1 and stir evenly to obtain the titanium oxide aerogel water-based coating of the present invention. The titanium oxide aerogel is a hydrophobic titanium oxide aerogel, and the particle size of the titanium oxide aerogel powder is 0.1 - 5 μm. Example 2

[0020] Step 1. Slowly add 0.5 part by mass of fibroin to 30 parts by mass of a water-soluble resin solution. The water-soluble resin in this embodiment is an aqueous silicon-acrylic resin solution (in some other embodiments, the water-soluble resin is at least one of acrylic resin, waterborne polyurethane resin, waterborne epoxy resin, waterborne amino resin, and aqueous silicon-acrylic resin). At the same time, add 44.5 parts by mass of deionized water and stir evenly to obtain a mixed solution. Step 2. Slowly add 5 parts by mass of titanium oxide aerogel powder to the mixed solution obtained in Step 1 and stir evenly to obtain the titanium oxide aerogel water-based coating of the present invention. The titanium oxide aerogel is a hydrophobic titanium oxide aerogel, and the particle size of the titanium oxide aerogel powder is 0.1 - 5 μm. Example 3

[0021] Step 1. Slowly add 1 part by mass of silk fibroin into 40 parts by mass of a water-soluble resin solution. The water-soluble resin in this example is an aqueous silicon-acrylic resin solution (in some other examples, the water-soluble resin is at least one of acrylic resin, aqueous polyurethane resin, aqueous epoxy resin, aqueous amino resin, and aqueous silicon-acrylic resin). At the same time, add 39 parts by mass of deionized water and stir evenly to obtain a mixed solution; Step 2. Slowly add 10 parts by mass of titanium oxide aerogel powder into the mixed solution obtained in Step 1 and stir evenly to obtain the titanium oxide aerogel water-based coating of the present invention. The titanium oxide aerogel is a hydrophobic titanium oxide aerogel, and the particle size of the titanium oxide aerogel powder is 0.1 - 5 μm.

[0022] Comparative Example 1 Step 1. Slowly add 0.1 part by mass of a carboxylate dispersant (BSF Dispex AA 4040) into 50 parts by mass of an aqueous acrylic resin solution and stir evenly to obtain a mixed solution; Step 2. Slowly add 1 part by mass of titanium oxide aerogel powder into the mixed solution obtained in Step 1, add 68.9 parts by mass of deionized water and stir evenly, then it is done.

[0023] Comparative Example 2 Step 1. Slowly add 0.5 part by mass of a sulfonate dispersant (sodium dodecylbenzenesulfonate) into 30 parts of an aqueous acrylic resin solution and stir evenly to obtain a mixed solution; Step 2. Slowly add 5 parts by mass of titanium oxide aerogel powder into the mixed solution obtained in Step 1, add 44.5 parts by mass of deionized water and stir evenly, then it is done.

[0024] Comparative Example 3 Step 1. Slowly add 1 part by mass of an alkyl quaternary ammonium salt dispersant (N-dodecyl bisquaternary ammonium salt) into 40 parts by mass of an aqueous acrylic resin solution and stir evenly to obtain a mixed solution; Step 2. Slowly add 10 parts by mass of titanium oxide aerogel powder into the mixed solution obtained in Step 1, add 39 parts by mass of deionized water and stir evenly, then it is done.

[0025] Performance Test Perform performance tests on the titanium oxide aerogel water-based coatings provided in the examples and comparative examples. The test results are shown in Table 1; Among them: The test standard for the flexibility of the paint film is GB / T 1731 - 1993 "Determination Method for Flexibility of Paint Films", and the diameter of the mandrel used is 1 mm.

[0026] The test standard for the adhesion of the paint film is GB / T 9286 - 1998 "Cross-Cut Test for Paint and Varnish Films", and the cross-cut spacing is 1 mm.

[0027] Table 1

[0028] As can be seen from the above test results, in the titanium oxide aerogel waterborne coating prepared by the method of the present invention, due to the long molecular chain and flexible chain of silk fibroin, it is easy to form chain entanglement with the resin polymer chain, and the alternately separated hydrophobic segments and hydrophilic segments can form van der Waals forces, hydrogen bonds and other interaction forces with various groups on the resin polymer chain, so the basic mechanical properties of the resin coating are good; while the dispersant used in the comparative example has a simple structure and cannot form good interaction with the resin polymer chain except for playing a dispersing role. Therefore, without adding other additives, the mechanical properties of the paint film are poor.

[0029] The above are some embodiments of the titanium oxide aerogel waterborne coating and its preparation method in the present invention. In addition, the present invention also discloses embodiments of textiles using the titanium oxide aerogel waterborne coating and their preparation methods.

[0030] In some embodiments, the textile includes the titanium oxide aerogel waterborne coating in the present invention and also includes a substrate, and the titanium oxide aerogel waterborne coating is attached to the substrate.

[0031] The substrate includes at least one of non-woven fabric and polyester fiber fabric.

[0032] In some embodiments, the preparation method of the textile includes: taking the titanium oxide aerogel waterborne coating and coating it on the substrate, and obtaining it after drying.

[0033] In addition to being used on textiles, the titanium oxide aerogel waterborne coating in the present invention can also have other applications. For example, the titanium oxide aerogel waterborne coating can be used as a coating for sunscreen products. Sunscreen products include building sunshade products, traffic protection products, agricultural greenhouse products, household light-shielding products, industrial storage products, outdoor activity products and emergency disaster relief products, etc.

[0034] The textiles and sunscreen products using the titanium oxide aerogel waterborne coating have good light-blocking performance.

[0035] The above description is only the specific embodiments of the present application, enabling those skilled in the art to understand or implement the present application. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to these embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A titanium oxide aerogel waterborne coating, characterized in that, It includes the following components: Titanium oxide aerogel powder, water-soluble resin, silk fibroin, and deionized water.

2. The titanium oxide aerogel aqueous coating according to claim 1, characterized in that, The mass ratio of the titanium oxide aerogel powder, water-soluble resin, silk fibroin, and deionized water is 1-10:30-50:0.1-1:39-68.

9.

3. The titanium oxide aerogel aqueous coating according to claim 1, characterized in that, The titanium oxide aerogel is a hydrophobic titanium oxide aerogel.

4. The titanium oxide aerogel aqueous coating according to claim 1, characterized in that, The particle size of the titanium oxide aerogel powder is 0.1-5 μm.

5. The titanium oxide aerogel aqueous coating according to claim 1, wherein The water-soluble resin is at least one of acrylic resin, waterborne polyurethane resin, waterborne epoxy resin, waterborne amino resin, and waterborne silicon-acrylic resin.

6. A preparation method of the titanium oxide aerogel aqueous coating according to any one of claims 1-5, characterized in that, It includes the following steps: Step 1: Slowly add silk fibroin into the aqueous resin solution, and at the same time add deionized water and stir evenly to obtain a mixed solution; Step 2: Slowly add the titanium oxide aerogel powder into the mixed solution obtained in Step 1 and stir evenly to obtain the titanium oxide aerogel water-based coating.

7. A textile, characterized in that, It includes the titanium oxide aerogel water-based coating according to any one of claims 1-5 and a substrate, and the titanium oxide aerogel water-based coating is attached to the substrate.

8. The textile according to claim 7, characterized in that, The substrate includes at least one of non-woven fabric and polyester fiber fabric.

9. The method for preparing a textile according to claim 7, characterized in that, It includes: Take the titanium oxide aerogel water-based coating and coat it on the substrate, and obtain it after drying.

10. Use of the titanium oxide aerogel aqueous coating according to any one of claims 1-5, characterized in that, This titanium oxide aerogel water-based coating is used as a coating for sunscreen products.

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