Fragrant water-based nano ceramic coating and preparation method thereof

Abstract

The invention discloses a fragrant water-based nano ceramic coating which comprises the following raw materials in percentage by mass: 45-75% of fragrant water-based coating, 20-50% of water-based nano ceramic resin, 1-5% of absolute ethyl alcohol and the balance of deionized water, and a preparation method of the fragrant water-based nano ceramic coating comprises the following steps: putting the raw materials into a dispersion machine for high-speed dispersion and low-speed dispersion in sequence, and standing to obtain the product. Wherein the fragrant water-based paint is obtained by sequentially adding other reagents into the essence-loaded photo-crosslinking nanoparticle suspension and then dispersing by using a dispersion machine. The fragrance lasting effect is achieved by adding the essence-loaded photo-crosslinking nanoparticle suspension, the composite ceramic coating combining flexibility and hardness is achieved by conducting flexible modification on the silicon ceramic resin, meanwhile, waterborne polyurethane resin is introduced into the fragrant water-based coating, the surface molecular structure of a base material is improved, the passivation effect is achieved, and the service life of the coating is prolonged. The scratch resistance and the acid and alkali corrosion resistance are greatly improved, so that the water-based nano ceramic still has the excellent properties of environmental protection, high temperature resistance, wear resistance, corrosion resistance and the like which are unique to the water-based nano ceramic after the fragrance components are added.

Description

Technical Field

[0001] The invention relates to the field of coatings, and in particular to a scented water-based nano ceramic coating and a preparation method thereof. Background Art

[0002] Traditional coatings have certain limitations in terms of environmental protection, weather resistance, and decorativeness. With the advancement of science and technology and people's pursuit of quality of life, environmentally friendly coatings with special functions (such as fragrance) have gradually become the new favorites of the market. Water-based nano-ceramic coatings have shown great application potential in the field of coatings with their excellent properties, such as high hardness, high wear resistance, and high weather resistance. However, most of the water-based nano-ceramic coatings on the market currently lack personalized characteristics such as fragrance, and it is difficult to meet the diversified needs of consumers. By adding special environmentally friendly, healthy and safe fragrance ingredients to water-based nano-ceramic coatings, the coating can emit a long-lasting pleasant fragrance after use, which meets the needs of some special products and some people. After use, it can play a role in pleasing people and enhancing comfort. Summary of the invention

[0003] The purpose of the present invention is to provide a scented water-based nano-ceramic coating and a preparation method thereof, so as to solve the problems raised in the above-mentioned background technology.

[0004] To achieve the above object, the present invention provides a scented water-based nano ceramic coating, the raw materials are, by mass percentage, 45-75% of scented water-based coating, 20-50% of water-based nano ceramic resin, 1-5% of anhydrous ethanol and the balance of deionized water;

[0005] The composition of the scented water-based paint is, by mass percentage, 5-15% of a light-crosslinked nanoparticle suspension loaded with fragrance, 80-90% of a water-based polyurethane resin, and 3-5% of other additives;

[0006] The composition of the aqueous nano-ceramic resin is, by mass percentage, 5-15% aqueous acrylic polymer, 5-20% silica sol solution, 23-40% siloxane, 2-15% alcohol, 0.5-1.5% metal oxide and the balance deionized water;

[0007] The preparation of the fragrance-loaded photo-crosslinked nanoparticle suspension comprises the following steps: (1) using styrene-based photosensitive monomers 7-(4-vinylbenzyloxy)-4-methylcoumarin (VM), styrene (St), and maleic anhydride (MA) as comonomers, and adopting a free radical polymerization method to prepare a photosensitive polymer P (St / VM-co-MA); (2) dissolving the photosensitive polymer P (St / VM-co-MA) and fragrance molecules in a mass ratio of 3:1 in an appropriate amount of dimethylformamide (DMF) solution, stirring vigorously, and slowly adding water dropwise; when blue opalescence appears, slowly adding the solution dropwise into an appropriate amount of water, and stirring vigorously to obtain a fragrance-loaded nanoparticle solution; (3) taking the fragrance-loaded nanoparticle solution in the above step (2) and irradiating it with ultraviolet light for 15-60 minutes, to obtain a fragrance-loaded photo-crosslinked nanoparticle suspension.

[0008] As a preferred technical solution of the present invention, the other auxiliary agents are one or more of a defoaming agent, a leveling agent, and a thickener.

[0009] As a preferred technical solution of the present invention, the thickener is cellulose ether and its derivatives, the leveling agent is an organosilicon leveling agent or a fluorocarbon leveling agent, and the defoamer is a water-based coating defoamer.

[0010] As a preferred technical solution of the present invention, the siloxane is polydimethylsiloxane, hydroxypolydimethylsiloxane or methyltrimethoxysilane, the acrylic polymer is methyl methacrylate, n-butyl methacrylate or tert-butyl cyclohexyl methacrylate, the alcohol is methanol, ethanol or isopropanol, and the metal oxide is an alkali metal oxide or a rare earth metal oxide.

[0011] As a preferred technical solution of the present invention, the ultraviolet irradiation intensity in the preparation of the light-crosslinked nanoparticle suspension loaded with flavor is 50mW / cm 2 .

[0012] A method for preparing a scented water-based nano-ceramic coating comprises the following steps:

[0013] S1. Preparation of scented water-based paint: according to the proportion of the components of the scented water-based paint, water-based polyurethane resin, leveling agent and defoamer are added to the light-crosslinked nanoparticle suspension loaded with fragrance in sequence, ground with a grinder to a particle size of less than 10 microns, and then a thickener is added. At normal temperature and pressure, high-speed dispersion is performed with a disperser for 30-40 minutes to obtain a scented water-based paint;

[0014] S2. Preparation of water-based nano-ceramic resin: according to the proportion of the components of the water-based nano-ceramic resin, water-based acrylic polymer, silica sol solution, siloxane, alcohol, deionized water and a trace amount of metal oxide are added to the reactor in sequence, and stirred and reacted at room temperature and pressure for 20-60 minutes to obtain a water-based nano-ceramic resin;

[0015] S3. Preparation of scented water-based nano-ceramic coating: Weigh the scented water-based coating, water-based nano-ceramic resin, anhydrous ethanol and deionized water according to the component proportions and add the ingredients. At room temperature and pressure, disperse them at high speed for 10 minutes using a disperser, then disperse them at low speed for 50-60 minutes, and then let them stand for 30-40 minutes to obtain the scented water-based nano-ceramic coating.

[0016] As a preferred technical solution of the present invention, the speed of high-speed dispersion in step S1 is 750-1500 rpm.

[0017] As a preferred technical solution of the present invention, the speed of the high-speed dispersion in step S3 is 750-1500 rpm, and the speed of the low-speed dispersion is 200-600 rpm.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] (1) The light-crosslinked nanoparticle suspension loaded with fragrance of the present invention adopts a photosensitive polymer P (St / VM-co-MA), which itself has a structure containing hydrophilic maleic anhydride units and hydrophobic styrene units, and can be used as a high molecular surfactant, a good dispersant, a compatibilizer, etc. It can form stable nano-colloidal particles in a certain solvent. Through mature polymer self-assembly technology, it can wrap fragrance molecules in nanoparticles, and at the same time, ultraviolet light irradiation is used to induce VM units to crosslink, so that the nanoparticles are cross-linked, thereby wrapping the fragrance molecules more tightly, which plays a fixing role on the fragrance molecules to a certain extent, and it is not easy to release them quickly, so as to achieve the effect of lasting fragrance.

[0020] (2) The water-based nano-ceramic resin of the present invention adopts silica sol solution, siloxane aqueous solution and water-based acrylic polymer as main raw materials, and achieves a composite ceramic coating that combines flexibility and hardness by modifying the flexibility of the silicon-based ceramic resin. At the same time, the introduction of organic material water-based polyurethane resin into the fragrance water-based coating helps to improve the molecular structure of the substrate surface and play a passivation role, thereby achieving the purpose of green environmental protection and low-temperature curing, so that the surface pencil hardness of the formed fragrance water-based nano-ceramic coating can reach 4H, overcoming the defects of traditional fluorocarbon coatings, and the scratch resistance and acid and alkali corrosion resistance are greatly improved compared with organic coatings, thereby achieving the unique environmental protection, high temperature resistance, wear resistance and corrosion resistance of water-based nano-ceramics after the addition of fragrance components. Excellent performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 The fragrance release curves of scented water-based nano-ceramic coatings under different UV irradiation times. DETAILED DESCRIPTION

[0022] The present invention will be further described below in conjunction with the embodiments.

[0023] Example 1

[0024] This embodiment provides a method for preparing a scented water-based nano-ceramic coating, comprising the following steps:

[0025] (1) Using styrene-based photosensitive monomers 7-(4-vinylbenzyloxy)-4-methylcoumarin (VM), styrene (St), and maleic anhydride (MA) as comonomers, a photosensitive polymer P (St / VM-co-MA) was prepared by free radical polymerization. Specifically, the synthesis method reported in the literature "Self-assembled colloidal particles of photosensitive copolymer P (St / VM-co-MA) and its properties" was used;

[0026] (2) Weigh 3 g of the prepared photosensitive polymer P(St / VM-co-MA) and 1 g of the flavor molecule, dissolve them in 60 ml of DMF, stir vigorously, and slowly add water. When blue opalescence appears, slowly add the solution to 240 ml of water and stir vigorously to obtain a flavor-loaded nanoparticle solution. The flavor-loaded nanoparticle solution is irradiated at an intensity of 50 mW / cm 2 After irradiation with ultraviolet light for 15 min, a photo-crosslinked nanoparticle suspension loaded with fragrance was obtained;

[0027] (3) Weighing 2 g of the fragrance-loaded photo-crosslinked nanoparticle suspension, 17 g of waterborne polyurethane resin, 0.25 g of leveling agent and 0.25 g of defoaming agent, and putting them into a grinder, grinding them into a particle size of less than 10 μm, and then adding 0.5 g of thickener, and dispersing them at a high-speed dispersion speed of 1000 rpm for 35 minutes using a disperser at room temperature and pressure to obtain a scented waterborne coating;

[0028] (4) adding 3 g of aqueous acrylic polymer, 4 g of silica sol solution, 8 g of polydimethylsiloxane, 3 g of methanol, 1.8 g of deionized water and 0.2 g of alkali metal oxide to a reactor in sequence and stirring the mixture for 60 minutes at room temperature and pressure to obtain an aqueous nano-ceramic resin;

[0029] (5) Weigh 11 g of the above-mentioned scented water-based paint, 7 g of the water-based nano-ceramic resin, 1 g of anhydrous ethanol, and 1 g of deionized water and put them into a disperser. At room temperature and pressure, disperse them at a high-speed dispersion speed of 1000 rpm for 10 minutes, then disperse them at a low-speed dispersion speed of 1000 rpm for 60 minutes, and then let them stand for 40 minutes to obtain a scented water-based nano-ceramic paint.

[0030] Example 2

[0031] The scented water-based nano ceramic coating was prepared according to the preparation method of Example 1, except that the fragrance-loaded nano particle solution in step (2) was irradiated at an intensity of 50 mW / cm 2 After irradiation with ultraviolet light for 25 min, a photo-crosslinked nanoparticle suspension loaded with fragrance was obtained.

[0032] Example 3

[0033] The scented water-based nano ceramic coating was prepared according to the preparation method of Example 1, except that the fragrance-loaded nano particle solution in step (2) was irradiated at an intensity of 50 mW / cm 2 After irradiation with ultraviolet light for 35 min, a photo-crosslinked nanoparticle suspension loaded with fragrance was obtained.

[0034] Example 4

[0035] The scented water-based nano ceramic coating was prepared according to the preparation method of Example 1, except that the fragrance-loaded nano particle solution in step (2) was irradiated at an intensity of 50 mW / cm 2 After irradiation with ultraviolet light for 45 min, a photo-crosslinked nanoparticle suspension loaded with fragrance was obtained.

[0036] Example 5

[0037] The scented water-based nano ceramic coating was prepared according to the preparation method of Example 1, except that the fragrance-loaded nano particle solution in step (2) was irradiated at an intensity of 50 mW / cm 2 After irradiation with ultraviolet light for 60 minutes, a photo-crosslinked nanoparticle suspension loaded with fragrance was obtained.

[0038] Comparative Example

[0039] The scented water-based nano-ceramic coating was prepared according to the preparation method of Example 1, except that the fragrance-loaded nanoparticle solution in step (2) was directly used in step (3) without being irradiated with ultraviolet light.

[0040] Test Case

[0041] The scented water-based nano-ceramic coatings in Examples 2-5 and Comparative Example 1 were coated and dried to form films, and the films were immersed in a buffer solution. The cumulative release rate of the fragrance was tested using UV spectroscopy. The results are as follows: Figure 1 The results showed that the coating film made of the coating without UV irradiation released most of the fragrance in 2 hours. As the UV irradiation time increased, the cumulative release rate of the fragrance decreased, indicating that photocrosslinking played a role in controlling the release of the fragrance, thereby achieving the effect of lasting fragrance.

[0042] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A scented water-based nano-ceramic coating, characterized by: The raw materials are calculated by mass percentage as follows: 45-75% of scented water-based paint, 20-50% of water-based nano-ceramic resin, 1-5% of anhydrous ethanol and the balance of deionized water; The composition of the scented water-based paint is, by mass percentage, 5-15% of a light-crosslinked nanoparticle suspension loaded with fragrance, 80-90% of a water-based polyurethane resin, and 3-5% of other additives; The composition of the aqueous nano-ceramic resin is, by mass percentage, 5-15% aqueous acrylic polymer, 5-20% silica sol solution, 23-40% siloxane, 2-15% alcohol, 0.5-1.5% metal oxide and the balance deionized water; The preparation of the fragrance-loaded photo-crosslinked nanoparticle suspension comprises the following steps: (1) using styrene-based photosensitive monomers 7-(4-vinylbenzyloxy)-4-methylcoumarin (VM), styrene (St), and maleic anhydride (MA) as comonomers, and adopting a free radical polymerization method to prepare a photosensitive polymer P (St / VM-co-MA); (2) dissolving the photosensitive polymer P (St / VM-co-MA) and fragrance molecules in a mass ratio of 3:1 in an appropriate amount of dimethylformamide (DMF) solution, stirring vigorously, and slowly adding water dropwise; when blue opalescence appears, slowly adding the solution dropwise into an appropriate amount of water, and stirring vigorously to obtain a fragrance-loaded nanoparticle solution; (3) taking the fragrance-loaded nanoparticle solution in the above step (2) and irradiating it with ultraviolet light for 15-60 minutes, to obtain a fragrance-loaded photo-crosslinked nanoparticle suspension.

2. The scented water-based nano-ceramic coating according to claim 1, characterized in that: The other auxiliary agents are one or more of a defoamer, a leveling agent, and a thickener.

3. The scented water-based nano-ceramic coating according to claim 2, characterized in that: The thickener is cellulose ether and its derivatives, the leveling agent is an organic silicon leveling agent or a fluorocarbon leveling agent, and the defoamer is a water-based paint defoamer.

4. The scented water-based nano-ceramic coating according to claim 1, characterized in that: The siloxane is polydimethylsiloxane, hydroxy polydimethylsiloxane or methyltrimethoxysilane, the acrylic polymer is methyl methacrylate, n-butyl methacrylate or tert-butyl cyclohexyl methacrylate, the alcohol is methanol, ethanol or isopropanol, and the metal oxide is an alkali metal oxide or a rare earth metal oxide.

5. The scented water-based nano-ceramic coating according to claim 1, characterized in that: The ultraviolet light irradiation intensity in the preparation of the light-crosslinked nanoparticle suspension loaded with fragrance is 50 mW / cm 2 .

6. A method for preparing a scented water-based nano-ceramic coating, characterized in that: The following steps are involved: S1. Preparation of scented water-based paint: according to the proportion of the components of the scented water-based paint, water-based polyurethane resin, leveling agent and defoamer are added to the light-crosslinked nanoparticle suspension loaded with fragrance in sequence, ground with a grinder to a particle size of less than 10 microns, and then a thickener is added. At normal temperature and pressure, high-speed dispersion is performed with a disperser for 30-40 minutes to obtain a scented water-based paint; S2. Preparation of water-based nano-ceramic resin: according to the proportion of the components of the water-based nano-ceramic resin, water-based acrylic polymer, silica sol solution, siloxane, alcohol, deionized water and a trace amount of metal oxide are added to the reactor in sequence, and stirred and reacted at room temperature and pressure for 20-60 minutes to obtain a water-based nano-ceramic resin; S3. Preparation of scented water-based nano-ceramic coating: Weigh the scented water-based coating, water-based nano-ceramic resin, anhydrous ethanol and deionized water according to the component proportions and add the ingredients. At room temperature and pressure, disperse them at high speed for 10 minutes using a disperser, then disperse them at low speed for 50-60 minutes, and then let them stand for 30-40 minutes to obtain the scented water-based nano-ceramic coating.

7. The method for preparing a scented water-based nano-ceramic coating according to claim 6, characterized in that: The speed of high-speed dispersion in step S1 is 750-1500 rpm.

8. The method for preparing a scented water-based nano-ceramic coating according to claim 6, characterized in that: In step S3, the speed of high-speed dispersion is 750-1500 rpm, and the speed of low-speed dispersion is 200-600 rpm.

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