High-temperature-resistant slow-release fragrant curtain and preparation method thereof

Abstract

The invention provides a high-temperature-resistant slow-release fragrant curtain and a preparation method thereof. The preparation method comprises the following steps: (1) fixing fragrance essential oil in pore channels of mesoporous silica through capillary acting force to obtain composite powder; (2) placing the composite powder in a molten phase change material, and adding an emulsifier and water to form a stable emulsion; (3) dropwise adding a melamine-formaldehyde resin prepolymer solution into the emulsion, and carrying out condensation polymerization on a water-oil interface to form a shell-core type sustained-release capsule; and (4) immersing the fabric subjected to surface treatment into a water-based working solution containing shell-core type slow-release capsules and a water-based adhesive, drying and curing to obtain the high-temperature-resistant slow-release fragrant curtain. Curtain fragrance molecules obtained through the preparation method need to be sequentially taken out from mesoporous channels, penetrate through the fused or solid PCM, then diffuse to penetrate through the polymer wall material and finally released into the environment, the curtain fragrance molecules are not sensitive to temperature changes, fragrance release is slow, and the fragrance release period is prolonged.

Description

Technical Field

[0001] This invention relates to the field of curtain technology, specifically to a high-temperature resistant slow-release aromatic curtain and its preparation method. Background Technology

[0002] Curtains are an indispensable functional and decorative element in interior spaces. Currently, curtains in my country are relatively traditional, mainly offering heat insulation and light-blocking functions. However, as consumers' demands for the quality of their living environment continue to rise, their functional needs for curtains are becoming increasingly diversified. In recent years, a small number of scented curtains have appeared on the market, primarily releasing pleasant fragrances to enhance the olfactory comfort of the interior space.

[0003] However, existing mainstream directional curtain technology has significant limitations. It typically involves directly depositing or coating fragrances (such as essential oils, perfumes, or combinations thereof) onto the surface of the curtain fabric to form a fragrance film or coating. This simple loading method leads to a series of problems, such as fragrance molecules being directly exposed to the environment and the lack of effective slow-release weaving, resulting in an overly strong initial release of fragrance with a very short effective duration, failing to achieve a stable and lasting directional experience. Furthermore, under high temperature and strong light conditions, some components in the fragrance may undergo photochemical reactions, potentially leading to fragrance degradation or component failure. In addition, the coating or film on the fabric surface is prone to localized peeling due to friction and folding.

[0004] Therefore, while existing scented curtains can release fragrance, their durability and temperature resistance are insufficient in practical use. Thus, there is an urgent market need for scented curtains with controllable, long-lasting fragrance release and high environmental stability, thereby truly enhancing the practical value of curtains and the user experience. Summary of the Invention

[0005] (a) Technical problems to be solved

[0006] To address the shortcomings of existing technologies, this invention provides a method for preparing a high-temperature resistant slow-release aromatic curtain, which solves the problems mentioned in the background section.

[0007] (II) Technical Solution

[0008] To achieve the above objectives, the present invention provides the following technical solution:

[0009] According to a first aspect of the present invention, a method for preparing a high-temperature resistant slow-release aromatic curtain is provided, comprising the following steps:

[0010] (1) Fragrance essential oils are fixed inside the pores of mesoporous silica by capillary force to obtain composite powder;

[0011] (2) The composite powder is placed in molten phase change material, and then an emulsifier and water are added to form a stable emulsion;

[0012] (3) The melamine-formaldehyde resin prepolymer solution is dropped into the emulsion, and a condensation reaction occurs at the water-oil interface to form a core-shell type sustained-release capsule.

[0013] (4) The surface-treated fabric is immersed in an aqueous working solution containing shell-core type sustained-release capsules and aqueous adhesive, and then dried and cured to obtain a high-temperature resistant sustained-release aromatic curtain.

[0014] Preferably, in step (1), the particle size of the mesoporous silica is 2-5 nm.

[0015] Preferably, in step (2), the phase change material is selected from at least one of n-octacosane or ethyl palmitate;

[0016] The emulsifier is selected from nonionic emulsifiers or reactive emulsifiers.

[0017] Preferably, in step (2), the mass ratio of the phase change material to the composite powder is 1:0.2 to 0.5;

[0018] The mass ratio of the phase change material to water is 1:3 to 6;

[0019] The emulsifier is 2-6 wt% of the phase change material.

[0020] Preferably, in step (3), the pH of the polycondensation reaction is 4.0 to 5.0.

[0021] Preferably, in step (3), the mass concentration of the melamine-formaldehyde resin prepolymer solution is 20-30%.

[0022] Preferably, in step (3), the melamine-formaldehyde resin prepolymer solution is added to the emulsion at a rate of 0.5 to 1 mL / min.

[0023] Preferably, in step (3), the temperature of the polycondensation reaction is 50-55°C.

[0024] Preferably, in step (4), the mass ratio of the shell-core type sustained-release capsule to the aqueous binder and water in the aqueous working solution is 1:0.3-0.6:5-10;

[0025] The aqueous binder is selected from polyurethane dispersions or polypropylene copolymers.

[0026] According to a second aspect of the present invention, a high-temperature resistant slow-release aromatic curtain based on the above preparation method is provided.

[0027] Beneficial effects

[0028] This invention provides a high-temperature resistant slow-release aromatic curtain and its preparation method. It has the following beneficial effects:

[0029] (1) The present invention provides a method for preparing a high-temperature resistant sustained-release aromatic curtain, which utilizes the nanopores of mesoporous silica to physically adsorb and confine the essential oils, then uses phase change materials to coat the mesoporous silica to suppress the explosive release of fragrance molecules at high temperatures, and finally sets a polymer wall material protective shell on the outermost layer to prevent the core-shell type sustained-release capsule from mechanical damage, oxidation and ultraviolet degradation, thereby improving the overall stability.

[0030] (2) The high-temperature resistant slow-release fragrance curtain provided by this solution requires the fragrance molecules to retreat from the mesoporous channels in sequence, pass through the molten or solid PCM, diffuse through the polymer wall material, and finally be released into the environment. It is not sensitive to temperature changes, the fragrance is released slowly, and the fragrance release cycle is improved. Detailed Implementation

[0031] To better illustrate the content of this invention, the following description is provided in conjunction with specific embodiments.

[0032] Example 1

[0033] A method for preparing a high-temperature resistant slow-release aromatic curtain includes the following steps:

[0034] A. Dissolve fragrance essential oil in anhydrous ethanol, then disperse mesoporous silica with a particle size of 2-5 nm in anhydrous ethanol, and then stir magnetically at room temperature. The fragrance essential oil enters the pores of the mesoporous silica through capillary force. Finally, the anhydrous ethanol is evaporated by vacuum distillation to obtain a composite powder.

[0035] B. The composite powder is placed in molten n-octacosane, and then a nonionic emulsifier and water are added. After high-speed shear emulsification, a stable emulsion is formed. The mass ratio of phase change material to composite powder and water is 1:0.3:5, and the nonionic emulsifier is 5wt% of the phase change material.

[0036] C. Oxalic acid was added to the emulsion to adjust the pH of the emulsion to 4.5. A melamine-formaldehyde resin prepolymer solution with a solid content of 25% was added to the emulsion at a dropping rate of 0.8 mL / min. A condensation reaction was carried out at the water-oil interface at 50°C to form a core-shell type sustained-release capsule encapsulated in MF resin shell.

[0037] D. The fabric is cleaned and hydrophilicated to improve the surface adhesion. Then, the shell-core type sustained-release capsules are dispersed in an acrylic water-based adhesive. After padding, drying and curing, a high-temperature resistant sustained-release fragrance curtain is obtained.

[0038] Example 2

[0039] A method for preparing a high-temperature resistant slow-release aromatic curtain includes the following steps:

[0040] A. Dissolve fragrance essential oil in anhydrous ethanol, then disperse mesoporous silica with a particle size of 2-5 nm in anhydrous ethanol, and then stir magnetically at room temperature. The fragrance essential oil enters the pores of the mesoporous silica through capillary force. Finally, the anhydrous ethanol is evaporated by vacuum distillation to obtain a composite powder.

[0041] B. The composite powder is placed in molten ethyl palmitate, and then the reactive emulsifier sodium vinyl sulfonate and water are added. After high-speed shear emulsification, a stable emulsion is formed. The mass ratio of phase change material to composite powder and water is 1:0.3:5, and the sodium vinyl sulfonate is 4wt% of the phase change material.

[0042] C. Oxalic acid was added to the emulsion to adjust the pH of the emulsion to 4.5. A melamine-formaldehyde resin prepolymer solution with a solid content of 25% was added to the emulsion at a dropping rate of 0.8 mL / min. A condensation reaction was carried out at the water-oil interface at 50°C to form a core-shell type sustained-release capsule encapsulated in MF resin shell.

[0043] D. The fabric is cleaned and hydrophilicated to improve the surface adhesion. Then, the shell-core type sustained-release capsules are dispersed in an acrylic water-based adhesive. After padding, drying and curing, a high-temperature resistant sustained-release fragrance curtain is obtained.

[0044] Example 3

[0045] A method for preparing a high-temperature resistant slow-release aromatic curtain includes the following steps:

[0046] A. Dissolve fragrance essential oil in anhydrous ethanol, then disperse mesoporous silica with a particle size of 2-5 nm in anhydrous ethanol, and then stir magnetically at room temperature. The fragrance essential oil enters the pores of the mesoporous silica through capillary force. Finally, the anhydrous ethanol is evaporated by vacuum distillation to obtain a composite powder.

[0047] B. The composite powder is placed in molten n-octacosane, and then a nonionic emulsifier and water are added. After high-speed shear emulsification, a stable emulsion is formed. The mass ratio of phase change material to composite powder and water is 1:0.3:5, and the nonionic emulsifier is 5wt% of the phase change material.

[0048] C. Oxalic acid was added to the emulsion to adjust the pH of the emulsion to 4.5. A melamine-formaldehyde resin prepolymer solution with a solid content of 20% was added to the emulsion at a dropping rate of 0.8 mL / min. A condensation reaction occurred at the water-oil interface at 50°C to form a core-shell type sustained-release capsule encapsulated in MF resin shell.

[0049] D. The fabric is cleaned and hydrophilicated to improve the surface adhesion. Then, the shell-core type sustained-release capsules are dispersed in an acrylic water-based adhesive. After padding, drying and curing, a high-temperature resistant sustained-release fragrance curtain is obtained.

[0050] Example 4

[0051] A method for preparing a high-temperature resistant slow-release aromatic curtain includes the following steps:

[0052] A. Dissolve fragrance essential oil in anhydrous ethanol, then disperse mesoporous silica with a particle size of 2-5 nm in anhydrous ethanol, and then stir magnetically at room temperature. The fragrance essential oil enters the pores of the mesoporous silica through capillary force. Finally, the anhydrous ethanol is evaporated by vacuum distillation to obtain a composite powder.

[0053] B. The composite powder is placed in molten n-octacosane, and then a nonionic emulsifier and water are added. After high-speed shear emulsification, a stable emulsion is formed. The mass ratio of phase change material to composite powder and water is 1:0.3:5, and the nonionic emulsifier is 5wt% of the phase change material.

[0054] C. Oxalic acid was added to the emulsion to adjust the pH of the emulsion to 4.5. A melamine-formaldehyde resin prepolymer solution with a solid content of 28% was added to the emulsion at a dropping rate of 0.8 mL / min. A condensation reaction occurred at the water-oil interface at 50°C to form a core-shell type sustained-release capsule encapsulated in MF resin shell.

[0055] D. The fabric is cleaned and hydrophilicated to improve the surface adhesion. Then, the shell-core type sustained-release capsules are dispersed in an acrylic water-based adhesive. After padding, drying and curing, a high-temperature resistant sustained-release fragrance curtain is obtained.

[0056] Example 5

[0057] A method for preparing a high-temperature resistant slow-release aromatic curtain includes the following steps:

[0058] A. Dissolve fragrance essential oil in anhydrous ethanol, then disperse mesoporous silica with a particle size of 2-5 nm in anhydrous ethanol, and then stir magnetically at room temperature. The fragrance essential oil enters the pores of the mesoporous silica through capillary force. Finally, the anhydrous ethanol is evaporated by vacuum distillation to obtain a composite powder.

[0059] B. The composite powder is placed in molten n-octacosane, and then a nonionic emulsifier and water are added. After high-speed shear emulsification, a stable emulsion is formed. The mass ratio of phase change material to composite powder and water is 1:0.3:5, and the nonionic emulsifier is 5wt% of the phase change material.

[0060] C. Oxalic acid was added to the emulsion to adjust the pH of the emulsion to 4.5. A melamine-formaldehyde resin prepolymer solution with a solid content of 25% was added to the emulsion at a dropping rate of 0.5 mL / min. A condensation reaction was carried out at the water-oil interface at 50°C to form a core-shell type sustained-release capsule encapsulated by an MF resin shell.

[0061] D. The fabric is cleaned and hydrophilicated to improve the surface adhesion. Then, the shell-core type sustained-release capsules are dispersed in an acrylic water-based adhesive. After padding, drying and curing, a high-temperature resistant sustained-release fragrance curtain is obtained.

[0062] Example 6

[0063] A method for preparing a high-temperature resistant slow-release aromatic curtain includes the following steps:

[0064] A. Dissolve fragrance essential oil in anhydrous ethanol, then disperse mesoporous silica with a particle size of 2-5 nm in anhydrous ethanol, and then stir magnetically at room temperature. The fragrance essential oil enters the pores of the mesoporous silica through capillary force. Finally, the anhydrous ethanol is evaporated by vacuum distillation to obtain a composite powder.

[0065] B. The composite powder is placed in molten n-octacosane, and then a nonionic emulsifier and water are added. After high-speed shear emulsification, a stable emulsion is formed. The mass ratio of phase change material to composite powder and water is 1:0.3:5, and the nonionic emulsifier is 5wt% of the phase change material.

[0066] C. Oxalic acid was added to the emulsion to adjust the pH of the emulsion to 4.5. A melamine-formaldehyde resin prepolymer solution with a solid content of 25% was added to the emulsion at a dropping rate of 1 mL / min. A condensation reaction was carried out at the water-oil interface at 50°C to form a core-shell type sustained-release capsule encapsulated by an MF resin shell.

[0067] D. The fabric is cleaned and hydrophilicated to improve the surface adhesion. Then, the shell-core type sustained-release capsules are dispersed in an acrylic water-based adhesive. After padding, drying and curing, a high-temperature resistant sustained-release fragrance curtain is obtained.

[0068] Comparative Example 1

[0069] The preparation method of this comparative example is the same as that of Example 1, except that the fragrance essential oil is directly added to the phase change material and mesoporous silica is not used.

[0070] Comparative Example 2

[0071] The preparation method of this comparative example is the same as that of Example 1, except that the composite powder prepared in step A is not coated with phase change material, but directly coated with organic shell material.

[0072] Comparative Example 3

[0073] The preparation method of this comparative example is the same as that of Example 1, except that the melamine-formaldehyde resin prepolymer solution in step C is replaced with gelatin-gum arabic for composite coagulation.

[0074] Performance testing

[0075] The slow-release aromatic curtains prepared in each embodiment and comparative example were first placed in a 70°C oven for accelerated aging. The initial aroma concentration and residual rate after 7 days were tested, and the slow-release period at 40°C was measured. The test data are shown in Table 1.

[0076] Table 1

[0077]

[0078]

[0079] According to the data in Table 1, the comparison between Comparative Example 1 and Example 1 shows that the high-temperature residual rate of fragrance essential oil without direct loading of mesoporous silica is only 38.7%, which proves that the mesoporous structure has a significant effect on improving thermal stability. The comparison between Comparative Example 2 and Example 1 shows that without phase change material coating, the residual rate at 70℃ decreases by 31%, which proves that the phase change heat absorption buffer has a protective effect on essential oil. Since MF resin undergoes interfacial condensation, the breakage rate of the wall material prepared by replacing it with gelatin is as high as 41.9%, which is too high. According to the above experimental results, this application adopts the triple synergistic effect of mesoporous loading, phase change buffer, and MF encapsulation, so that the curtain can stably release fragrance for a long time and significantly extend the service life.

[0080] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A method for preparing a high-temperature resistant slow-release aromatic curtain, characterized in that: Includes the following steps: (1) Fragrance essential oils are fixed inside the pores of mesoporous silica by capillary force to obtain composite powder; (2) The composite powder is placed in molten phase change material, and then an emulsifier and water are added to form a stable emulsion; (3) The melamine-formaldehyde resin prepolymer solution is dropped into the emulsion, and a condensation reaction occurs at the water-oil interface to form a core-shell type sustained-release capsule. (4) The surface-treated fabric is immersed in an aqueous working solution containing shell-core type sustained-release capsules and aqueous adhesive, and then dried and cured to obtain a high-temperature resistant sustained-release aromatic curtain.

2. The method for preparing a high-temperature resistant slow-release aromatic curtain according to claim 1, characterized in that: In step (1), the particle size of the mesoporous silica is 2-5 nm.

3. The method for preparing a high-temperature resistant slow-release aromatic curtain according to claim 1, characterized in that: In step (2), the phase change material is selected from at least one of n-octacosane or ethyl palmitate; The emulsifier is selected from nonionic emulsifiers or reactive emulsifiers.

4. The method for preparing a high-temperature resistant slow-release aromatic curtain according to claim 1, characterized in that: In step (2), the mass ratio of the phase change material to the composite powder is 1:0.2 to 0.5; The mass ratio of the phase change material to water is 1:3 to 6; The emulsifier is 2-6 wt% of the phase change material.

5. The method for preparing a high-temperature resistant slow-release aromatic curtain according to claim 1, characterized in that: In step (3), the pH of the polycondensation reaction is 4.0 to 5.

0.

6. The method for preparing a high-temperature resistant slow-release aromatic curtain according to claim 1, characterized in that: In step (3), the mass concentration of the melamine-formaldehyde resin prepolymer solution is 20-30%.

7. The method for preparing a high-temperature resistant slow-release aromatic curtain according to claim 1, characterized in that: In step (3), the melamine-formaldehyde resin prepolymer solution is added to the emulsion at a rate of 0.5 to 1 mL / min.

8. The method for preparing a high-temperature resistant slow-release aromatic curtain according to claim 1, characterized in that: In step (3), the temperature of the polycondensation reaction is 50-55°C.

9. The method for preparing a high-temperature resistant slow-release aromatic curtain according to claim 1, characterized in that: In step (4), the mass ratio of the shell-core type sustained-release capsule to the aqueous binder and water in the aqueous working solution is 1:0.3-0.6:5-10; The aqueous binder is selected from polyurethane dispersions or polypropylene copolymers.

10. A method for preparing a high-temperature resistant, slow-release aromatic curtain according to any one of claims 1 to 9.

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