Fragrance microcapsule and preparation method thereof, antibacterial fragrance-releasing UV paint, and decorative artificial board

Abstract

The present invention relates to the technical field of veneered artificial panels, and provides a fragrance microcapsule and a preparation method thereof, as well as an antibacterial fragrance-releasing UV paint and veneered artificial panels. The present invention utilizes a temperature-responsive polymer and a UV-responsive modified polyurea to form a wall material having a network interpenetrating structure, and utilizes the wall material to encapsulate an oily antibacterial fragrance substance, thereby achieving the purpose of protecting the antibacterial fragrance substance. Adding the fragrance microcapsules of the present invention to a UV topcoat for the preparation of veneered artificial panels can avoid the release and decomposition of the antibacterial fragrance substance during multiple UV drying processes during the preparation process, thereby achieving a long-lasting antibacterial fragrance-releasing effect of the veneered artificial panels. The present invention has industrial application value and broad market prospects.

Description

Technical Field

[0001] The invention relates to the technical field of veneer artificial boards, in particular to a fragrance microcapsule and a preparation method thereof, as well as an antibacterial fragrance-releasing UV paint and a veneer artificial board. Background Art

[0002] As consumers pay more attention to their home environment, new healthy and environmentally friendly decorative panels with antibacterial and fragrance-releasing functions have become a popular trend in the home decoration field.

[0003] UV paint is a coating that requires ultraviolet light to cure. It is applied to leather or veneer by pouring it onto the surface. UV light decomposes the initiator, generating free radicals that trigger a resin reaction and instantly cure into a film. UV paint itself does not have an antibacterial effect, making it susceptible to mildew during use. Adding antibacterial aromatic substances to UV paint not only improves the antibacterial properties of the UV paint finish but also provides a long-lasting fragrance that masks the irritating odor of the leather and artificial board itself, achieving multiple benefits at once. However, the UV paint pouring process requires 3 to 10 UV curing cycles. The high temperatures generated during curing, especially those exceeding 60°C, can easily lead to the rapid release or decomposition of aromatic substances, rendering the antibacterial and fragrance-releasing properties of the board ineffective. Summary of the Invention

[0004] In light of this, the present invention provides a fragrance microcapsule, an antibacterial fragrance-releasing decorative wood-based panel, and a preparation method. The present invention prepares antibacterial fragrance substances into temperature- and UV-responsive microcapsules, which are then used to prepare the antibacterial fragrance-releasing decorative wood-based panel. The resulting wood-based panel can achieve a long-lasting antibacterial and fragrance-releasing effect.

[0005] In order to achieve the above-mentioned object of the invention, the present invention provides the following technical solutions:

[0006] A fragrance microcapsule comprises a core and a wall material coated on the surface of the core; the core is an oily antibacterial fragrance substance; the wall material comprises a temperature-responsive polymer and a modified polyurea with UV response; the wall material is prepared from raw materials including hexamethylene diisocyanate, a chain extender, a temperature-responsive molecule, and a UV-responsive molecule; the temperature-responsive molecule is N,N-dimethylaminoethyl methacrylate, and the UV-responsive molecule is 4,4-diaminoazobenzene.

[0007] Preferably, the fragrance microcapsules include the following raw materials in the following mass fractions: 5% to 45% oily antibacterial fragrance substance, 2% to 5% hexamethylene diisocyanate, 0.4% to 2% N,N-dimethylaminoethyl methacrylate, 0.5% to 1% 4,4-diaminoazobenzene, 1% to 3.5% chain extender, 0.5% to 2.5% emulsifier, 0.2% to 0.3% initiator, 0.5% to 2% stabilizer, and 40% to 85% water; the total mass fraction of each raw material is 100%.

[0008] Preferably, the oily antibacterial fragrance substance includes one or more of agarwood oil, sandalwood essential oil and camphorwood essential oil.

[0009] Preferably, the chain extender is diethylenetriamine;

[0010] The emulsifier includes one or more of anionic surfactants and nonionic surfactants;

[0011] The initiator includes one or both of azobisisobutyronitrile and azophenyl bromoisobutyrate;

[0012] The stabilizer includes one or more of polyvinyl alcohol, cellulose derivatives, polyethylene oxide and acrylamide.

[0013] Preferably, the raw materials for preparing the fragrance microcapsules further include a catalyst, which includes one or more of copper chloride, copper bromide, dibutyltin dilaurate and stannous octoate; the amount of the catalyst used is 0.3-0.6% by weight of the hexamethylene diisocyanate.

[0014] The present invention also provides a method for preparing the fragrance microcapsules described in the above scheme, comprising the following steps:

[0015] mixing the oily antibacterial fragrance substance and hexamethylene diisocyanate to obtain an oil phase;

[0016] mixing an emulsifier and water to obtain an aqueous phase;

[0017] adding the aqueous phase to the oil phase for emulsification to obtain an oil-in-water emulsion;

[0018] Mixing N,N-dimethylaminoethyl methacrylate, a catalyst, and the oil-in-water emulsion to perform a first reaction to obtain a first reaction solution;

[0019] 4,4-diaminoazobenzene, an initiator, a chain extender and a stabilizer are added to the first reaction solution to carry out a second reaction to obtain the fragrance microcapsules.

[0020] Preferably, the temperature of the first reaction is 30-40°C and the time is 1-3 hours; the second reaction includes a first stage and a second stage carried out sequentially, the temperature of the first stage is 30-40°C and the time is 1.5 hours, and the temperature of the second stage is 50-60°C and the time is 1-3 hours.

[0021] The present invention also provides an antibacterial fragrance-releasing UV paint, comprising a UV paint resin and fragrance microcapsules; the fragrance microcapsules are the fragrance microcapsules described in the above scheme or the fragrance microcapsules prepared by the preparation method described in the above scheme.

[0022] The present invention also provides an antibacterial and fragrance-releasing veneer artificial board, comprising a veneer artificial board and a paint film arranged on the surface of the veneer artificial board; the paint film is prepared from the antibacterial and fragrance-releasing UV paint described in the above scheme.

[0023] The present invention also provides a method for preparing the antibacterial and fragrance-releasing decorative artificial board described in the above scheme, comprising the following steps:

[0024] The antibacterial and fragrance-releasing UV paint described in the above scheme is sprayed onto the surface of the veneered artificial board to obtain the antibacterial and fragrance-releasing veneered artificial board; the number of spraying is ≥2 times, and UV drying is performed after each spraying.

[0025] The present invention provides a fragrance microcapsule, comprising a capsule core and a wall material coated on the surface of the capsule core; the capsule core is an oily antibacterial fragrance substance; the wall material comprises a temperature-responsive polymer and a modified polyurea with UV response; the wall material is prepared from raw materials including hexamethylene diisocyanate, a chain extender, a temperature-responsive molecule and a UV-responsive molecule; the temperature-responsive molecule is N,N-dimethylaminoethyl methacrylate, and the UV-responsive molecule is 4,4-diaminoazobenzene. The present invention adopts 4,4-diaminoazobenzene to modify polyurea to form a modified polyurea with UV response, and simultaneously adopts N,N-dimethylaminoethyl methacrylate to polymerize to form a temperature-responsive polymer. The temperature-responsive polymer forms a bimolecular network (i.e., the wall material of the present invention) by physically entangled with the modified polyurea with UV response. The wall material of the present invention is used to encapsulate antibacterial fragrance substances, thereby achieving the encapsulation and protection of the antibacterial fragrance substances. When the UV drying temperature rises, the polymer chain of the microcapsule wall material closes the loop to protect the antibacterial fragrance substances. When the UV drying ends and the temperature drops, the molecular chain opens the loop to release the antibacterial fragrance substances. The above-mentioned reversible change process can achieve the purpose of protecting the antibacterial fragrance substances, avoid the release and decomposition of active substances during multiple UV drying, improve the sustained-release performance, and achieve a long-lasting antibacterial and fragrance-releasing effect.

[0026] Furthermore, the oily antibacterial fragrance substance used in the present invention is preferably agarwood oil, which is extracted from agarwood powder. Agarwood is the first of the four famous fragrances and is a plant extract recognized to have multiple effects such as anti-inflammatory, antibacterial, sedative, and pleasing to the body and mind. It has the characteristics of long-lasting fragrance release and low volatility. It is suitable for processes such as heating and UV drying of artificial boards, can maximize the antibacterial fragrance release time, and extend the functional life of artificial boards. The present invention uses agarwood oil to achieve the dual health benefits of antibacterial and fragrance release for artificial boards.

[0027] The present invention also provides an antibacterial and fragrance-releasing veneer panel, comprising a veneer panel and a topcoat layer disposed on the surface of the veneer panel; the topcoat layer comprises a UV topcoat resin and the fragrance microcapsules described in the above embodiment. The fragrance microcapsules provided by the present invention are stably miscible with the UV topcoat resin, and the antibacterial and fragrance-releasing veneer panel produced using the fragrance microcapsules exhibits a long-lasting antibacterial and fragrance-releasing effect, has industrial application value, and has broad market prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 Schematic diagram of the principle of temperature and UV response of the fragrance microcapsules of the present invention;

[0029] Figure 2 is the reaction formula of UV-responsive polymer;

[0030] Figure 3 is the reaction formula of the temperature-responsive polymer;

[0031] Figure 4 This is a scanning electron micrograph of agarwood oil polyurea microcapsules. DETAILED DESCRIPTION

[0032] The present invention provides a fragrance microcapsule, comprising a capsule core and a wall material coated on the surface of the capsule core; the capsule core is an oily antibacterial fragrance substance; the wall material comprises a temperature-responsive polymer and a modified polyurea with UV response; the wall material is prepared from raw materials comprising hexamethylene diisocyanate, a chain extender, a temperature-responsive molecule and a UV-responsive molecule; the temperature-responsive molecule is N,N-dimethylaminoethyl methacrylate, and the UV-responsive molecule is 4,4-diaminoazobenzene.

[0033] In the present invention, the fragrance microcapsules preferably include the following raw materials in the following mass fractions: 5% to 45% of oily antibacterial fragrance substances, preferably 10% to 40%, 2% to 5% of hexamethylene diisocyanate, preferably 3% to 4%, 0.4% to 2% of N,N-dimethylaminoethyl methacrylate, preferably 0.5% to 1.5%, 0.5% to 1% of 4,4-diaminoazobenzene, preferably 0.6% to 0.8%, 1% to 3.5% of chain extender, preferably 1.5% to 3%, 0.5% to 2.5% of emulsifier, preferably 1% to 2%, 0.2% to 0.3% of initiator, preferably 0.25%, 0.5% to 2% of stabilizer, preferably 1%, and 40% to 85% of water, preferably 50% to 70%; the total mass fraction of the above raw materials is 100%.

[0034] In a specific embodiment of the present invention, the mass of the N,N-dimethylaminoethyl methacrylate is preferably 20% to 100% of the mass of the isocyanate, and more preferably 50% to 60%; the mass of the 4,4-diaminoazobenzene is preferably 20% to 25% of the mass of hexamethylene diisocyanate; and the mass of the chain extender is preferably 50% to 70% of the mass of hexamethylene diisocyanate, and more preferably 55% to 65%.

[0035] In the present invention, the oily antibacterial fragrance substance preferably includes one or more of agarwood oil, sandalwood essential oil, and camphorwood essential oil, more preferably agarwood oil. Agarwood is a plant of the genus Aquilaria of the Thymelaeaceae family and is a resinous wood. The main components of agarwood are sesquiterpenes, chromones, aromatic compounds, etc. Chromone compounds have anti-inflammatory and antibacterial effects and have broad-spectrum antibacterial properties against various bacteria such as Helicobacter pylori and Staphylococcus aureus. Sesquiterpenes and aromatic compounds are the source of their unique fragrance. The present invention has no special requirements for the source of the above-mentioned oily antibacterial fragrance substance, and commercially available products or extraction methods well known to those skilled in the art can be used.

[0036] In the present invention, the preparation method of the agarwood oil preferably includes the following steps: supercritical extraction of agarwood powder to obtain primary oil; dehydrating the primary oil to remove low-boiling substances to obtain secondary oil; and distilling the secondary oil to obtain agarwood oil. The extraction agent used in the supercritical extraction is preferably supercritical carbon dioxide, the pressure of the supercritical extraction is preferably 30-40 MPa, more preferably 35 MPa, the temperature of the supercritical extraction is preferably 40-60° C., more preferably 55° C., and the time of the supercritical extraction is preferably 90-120 min, more preferably 100 min; after supercritical extraction, the present invention preferably separates the obtained extract to obtain primary oil, the pressure of the separation is preferably 6-7 MPa, and the temperature of the separation is preferably 50-60° C.; the temperature of the dehydration and low-boiling-point removal is preferably 60-80° C., more preferably 70° C., the pressure of the dehydration and low-boiling-point removal is preferably 2-4 MPa, more preferably 3 MPa, and the time of the dehydration and low-boiling-point removal is preferably 30-50 min, more preferably 40 min; the temperature of the distillation is preferably 100-130° C., more preferably 120° C., the pressure of the distillation is preferably 10-100 Pa, more preferably 50-70 Pa, and the time of the distillation is 30-50 min, more preferably 40 min. Agarwood oil obtained using supercritical extraction and separation technology.

[0037] In the present invention, the chain extender is preferably diethylenetriamine.

[0038] In the present invention, the emulsifier preferably includes one or more of anionic surfactants and nonionic surfactants; the anionic surfactant is preferably sodium lauryl sulfate; the nonionic surfactant preferably includes one or more of polyethylene oxide, polyethylene, Tween-80 and Span-80.

[0039] In the present invention, the initiator preferably includes one or both of azobisisobutyronitrile and azophenyl bromoisobutyrate, and more preferably azophenyl bromoisobutyrate.

[0040] In the present invention, the stabilizer preferably includes one or more of polyvinyl alcohol, cellulose derivatives, polyethylene oxide and acrylamide; the cellulose derivative is preferably hydroxyethyl cellulose; in a specific embodiment of the present invention, the stabilizer is preferably one or both of polyvinyl alcohol and hydroxyethyl cellulose.

[0041] In the present invention, the raw materials for preparing the fragrance microcapsules preferably also include a catalyst. The catalyst preferably includes one or more of cupric chloride, cupric bromide, dibutyltin dilaurate, and stannous octoate, and more preferably cupric dichloride. In a specific embodiment of the present invention, the amount of the catalyst is preferably 0.3-0.6% by weight of the hexamethylene diisocyanate, preferably 0.5%.

[0042] In the present invention, the water is preferably deionized water.

[0043] The present invention uses N,N-dimethylaminoethyl methacrylate and 4,4-diaminoazobenzene to modify polyurea to form a modified polyurea microcapsule wall material with temperature and UV response. When the UV drying temperature rises (above 45°C), the polymer chain of the microcapsule wall material closes the ring, protecting the antibacterial fragrance substance. When the UV drying ends and the temperature drops, the molecular chain opens the ring, releasing the antibacterial fragrance substance. Figure 1 Schematic diagram of the principle of UV and temperature response of the fragrance microcapsules of the present invention.

[0044] The present invention also provides a method for preparing the fragrance microcapsules described in the above scheme, comprising the following steps:

[0045] mixing the oily antibacterial fragrance substance and hexamethylene diisocyanate to obtain an oil phase;

[0046] mixing an emulsifier and water to obtain an aqueous phase;

[0047] adding the aqueous phase to the oil phase for emulsification to obtain an oil-in-water emulsion;

[0048] Mixing N,N-dimethylaminoethyl methacrylate, a catalyst, and the oil-in-water emulsion to perform a first reaction to obtain a first reaction solution;

[0049] 4,4-diaminoazobenzene, an initiator, a chain extender and a stabilizer are added to the first reaction solution to carry out a second reaction to obtain the fragrance microcapsules.

[0050] The present invention mixes the oily antibacterial fragrance substance and hexamethylene diisocyanate to obtain an oil phase. In the present invention, the mixing is preferably stirring, the stirring speed is preferably 5000 rpm, and the stirring time is preferably 3 minutes.

[0051] In the present invention, the emulsifier and water are mixed to obtain an aqueous phase. In the present invention, the mixing is preferably stirring, and the stirring speed is preferably 5000 rpm and the time is preferably 3 minutes.

[0052] After obtaining the aqueous phase and the oil phase, the present invention adds the aqueous phase to the oil phase for emulsification to obtain an oil-in-water emulsion. In the present invention, the emulsification is preferably performed by shear emulsification using a high-speed homogenizer; the shear emulsification rate is preferably 5000-15000 rpm, and the time is preferably 3-5 minutes.

[0053] After obtaining the oil-in-water emulsion, the present invention preferably mixes N,N-dimethylaminoethyl methacrylate, a catalyst, and the oil-in-water emulsion to conduct a first reaction to obtain a first reaction solution. In the present invention, N,N-dimethylaminoethyl methacrylate is preferably first added dropwise to the oil-in-water emulsion, and then the catalyst is added to conduct the first reaction. The temperature of the first reaction is preferably 30-40°C, and the time is preferably 1-3 hours. The first reaction is preferably conducted under stirring conditions.

[0054] After the first reaction is completed, the present invention preferably adds 4,4-diaminoazobenzene, an initiator, a chain extender and a stabilizer to the obtained first reaction liquid to carry out a second reaction to obtain fragrance microcapsules. In the present invention, the second reaction preferably includes a first stage and a second stage carried out in sequence. The temperature of the first stage is preferably 30-40°C, the time is preferably 1.5 hours, and the temperature of the second stage is preferably 50-60°C, and the time is preferably 1-3 hours. In a specific embodiment of the present invention, 4,4-diaminoazobenzene is preferably added dropwise to the first reaction liquid at 30-40°C, followed by the addition of an initiator, followed by the addition of a chain extender and a stabilizer, and the reaction is carried out under nitrogen protection for 1.5 hours, and then the temperature is raised to 50-60°C and the reaction is carried out at a constant temperature for 1-3 hours.

[0055] During the reaction, 4,4-diaminoazobenzene, hexamethylene diisocyanate and diethylenetriamine react to generate a modified polyurea with UV response, as shown in the reaction formula: Figure 2 As shown; N, N-dimethylaminoethyl methacrylate undergoes polymerization to generate a temperature-responsive polymer, as shown in the reaction formula. Figure 3 The temperature-responsive polymer and the modified polyurea with UV response are physically entangled to form a bimolecular network, which is the wall material of the present invention.

[0056] The present invention also provides an antibacterial, fragrance-releasing UV paint comprising a UV paint resin and fragrance microcapsules; the fragrance microcapsules are the fragrance microcapsules described in the above embodiment or prepared by the preparation method described in the above embodiment. In the present invention, the UV paint resin is specifically a UV topcoat resin, preferably comprising one or more of polyurethane, acrylate, epoxy acrylate, and acrylic-modified polyurethane; the fragrance microcapsules are preferably added in an amount of 0.1 to 1 wt% of the UV paint resin, more preferably 0.75 wt%.

[0057] The present invention has no special requirements for the preparation method of the antibacterial and fragrance-releasing UV paint, and the UV paint resin and the fragrance microcapsules can be directly mixed; the fragrance microcapsules prepared by the present invention can be stably miscible with the UV paint.

[0058] The present invention also provides an antibacterial and fragrance-releasing veneer artificial board, comprising a veneer artificial board and a paint film arranged on the surface of the veneer artificial board; the paint film is prepared from the antibacterial and fragrance-releasing UV paint described in the above scheme.

[0059] The present invention also provides a method for preparing the antibacterial and fragrance-releasing decorative artificial board described in the above scheme, comprising the following steps:

[0060] The antibacterial and fragrance-releasing UV paint described in the above scheme is sprayed onto the surface of the veneered artificial board to obtain the antibacterial and fragrance-releasing veneered artificial board; the number of spraying is ≥2 times, and UV drying is performed after each spraying.

[0061] In the present invention, the number of spraying is ≥ 2 times, preferably 2 times, and UV drying is performed after each spraying. The drying temperature is preferably 55-65°C, more preferably 58°C. The present invention has no special requirements for the UV drying time, as long as the coating after spraying can be dried; the coating thickness of each spraying is preferably 10-20 μm, more preferably 15 μm; in a specific embodiment of the present invention, before spraying the UV paint containing fragrance microcapsules, it is preferably also included to spray ordinary topcoat without fragrance microcapsules on the surface of the decorative panel; in a specific embodiment of the present invention, the spraying process includes a total of 5 to 7 times (i.e. the total number of spraying ordinary topcoat and spraying antibacterial and fragrance-releasing UV paint), and the antibacterial and fragrance-releasing UV paint is preferably sprayed in the last two spraying processes.

[0062] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions of the present invention. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0063] The agarwood oil used in the following examples was prepared by the following method: agarwood powder was loaded into a supercritical extraction apparatus and injected with supercritical CO2 fluid. Extraction was carried out at a pressure of 35 MPa and a temperature of 55°C for 100 minutes. The resulting extract was separated at a pressure of 6.5 MPa and a temperature of 55°C for 90 minutes to obtain a primary oil. The primary oil was then dehydrated and dehydrated at 70°C and 3 MPa for 40 minutes to obtain a secondary oil. The secondary oil was then distilled at a temperature of 120°C and a pressure of 50 Pa for 40 minutes to obtain agarwood oil.

[0064] Example 1

[0065] Step 1): 20 g of agarwood oil and 4 g of hexamethylene diisocyanate are mixed evenly at a mixing speed of 5000 rpm for 3 minutes to obtain an oil phase.

[0066] Step 2): 2 g of Tween-80 and 68.3 g of deionized water were mixed at a rotation speed of 5000 rpm for 3 minutes to obtain an aqueous phase.

[0067] Step 3): The water phase in step 2) is added to the oil phase in step 1), and shear emulsification is performed at a rotation speed of 8000 rpm for 4 minutes to obtain an oil-in-water emulsion.

[0068] Step 4): 2 g of N,N-dimethylaminoethyl methacrylate was added dropwise to the oil-in-water emulsion of step 3), 0.02 g of copper chloride was added as a catalyst, and the mixture was stirred at a constant speed at 35° C. for 1 h.

[0069] Step 5): 1 g of 4,4-diaminoazobenzene was added dropwise to step 4) at 35°C, 0.2 g of azophenyl bromoisobutyrate was added as an initiator, and then 2.0 g of diethylenetriamine and 0.5 g of polyvinyl alcohol were added dropwise. Under nitrogen protection, the reaction was carried out for 1.5 hours, and then the temperature was raised to 55°C and the reaction was kept at a constant temperature for 2 hours to obtain agarwood oil microcapsules with temperature and UV response.

[0070] Step 6): 0.15 g of the temperature- and UV-responsive agarwood oil microcapsules prepared above was added to 20 g of acrylic resin (topcoat) to obtain an acrylic resin containing agarwood oil microcapsules;

[0071] Step 7): Spray the acrylic resin containing agarwood oil microcapsules onto the surface of the decorative panel by spraying, spraying twice in steps, with a coating thickness of 15 μm each time, and UV drying after each spraying at a drying temperature of 58°C to obtain an antibacterial and fragrance-releasing decorative artificial board.

[0072] Example 2

[0073] Step 1): 30 g of agarwood oil and 5 g of hexamethylene diisocyanate were mixed uniformly at a speed of 5000 rpm for 3 minutes to obtain an oil phase.

[0074] Step 2): 1 g of sodium lauryl sulfate and 57.7 g of deionized water were mixed at a rotation speed of 5000 rpm for 3 minutes to obtain an aqueous phase.

[0075] Step 3): The water phase in step 2) is added to the oil phase in step 1), and shear emulsification is performed at a rotation speed of 10,000 rpm for 5 minutes to obtain an oil-in-water emulsion.

[0076] Step 4): 0.5 g of N,N-dimethylaminoethyl methacrylate was added dropwise to the oil-in-water emulsion of step 3), and 0.02 g of dibutyltin dilaurate was added as a catalyst. The mixture was stirred at a constant speed at 30° C. for 2 h.

[0077] Step 5): 1 g of 4,4-diaminoazobenzene was added dropwise to step 4) at 30°C, 0.3 g of azobisisobutyronitrile was added as an initiator, and then 3 g of diethylenetriamine and 1.5 g of hydroxyethyl cellulose were added dropwise. Under nitrogen protection, the reaction was carried out for 1.5 h, and then the temperature was raised to 50°C and the reaction was kept at a constant temperature for 1 h to obtain temperature- and UV-responsive agarwood oil microcapsules.

[0078] Step 6): Add 2 g of the temperature and UV-responsive agarwood oil microcapsules prepared above to 20 g of acrylic resin (topcoat) to obtain an acrylic resin containing agarwood oil microcapsules.

[0079] Step 7): By spraying the acrylic resin containing agarwood oil microcapsules onto the surface of the decorative panel, the coating is encapsulated twice in steps, with a coating thickness of 10 μm each time, and UV drying is performed after each spraying at a drying temperature of 60°C to obtain the antibacterial and fragrance-releasing decorative artificial board.

[0080] Comparative Example 1

[0081] Step 1): 20 g of agarwood oil and 4 g of hexamethylene diisocyanate were mixed evenly at a speed of 5000 rpm for 3 minutes to obtain an oil phase.

[0082] Step 2): 2 g of Tween-80 and 68.3 g of deionized water were mixed at a rotation speed of 5000 rpm for 3 minutes to obtain an aqueous phase.

[0083] Step 3): The water phase in step 2) is added to the oil phase in step 1), and shear emulsification is performed at a rotation speed of 8000 rpm for 4 minutes to obtain an oil-in-water emulsion.

[0084] Step 4): 2 g of N,N-dimethylaminoethyl methacrylate was added dropwise to the oil-in-water emulsion of step 3), 0.02 g of copper chloride was added as a catalyst, and the mixture was stirred at a constant speed at 35° C. for 1 h.

[0085] Step 5): Add 2.0 g of diethylenetriamine and 0.5 g of polyvinyl alcohol to step 4) at 35° C., react for 1.5 hours, then raise the temperature to 60° C. and keep the reaction at a constant temperature for 3 hours to obtain temperature-responsive agarwood oil microcapsules.

[0086] Step 6): 0.15 g of the temperature-responsive agarwood oil microcapsules prepared above was added to 20 g of acrylic resin (topcoat) to obtain acrylic resin containing agarwood oil microcapsules.

[0087] Step 7): By spraying the acrylic resin containing agarwood oil microcapsules onto the surface of the decorative panel, the coating is encapsulated twice in steps, with a coating thickness of 15 μm each time. After each spraying, UV drying is performed at a drying temperature of 58°C to obtain an antibacterial and fragrance-releasing decorative artificial board.

[0088] The difference between Comparative Example 1 and Example 1 is that in step 5), the UV responsive material 4,4-diaminoazobenzene and its initiator azophenyl bromoisobutyrate are not added.

[0089] Comparative Example 2

[0090] Step 1): 20 g of agarwood oil and 4 g of hexamethylene diisocyanate were mixed uniformly at a mixing speed of 5000 rpm for 3 minutes to obtain an oil phase.

[0091] Step 2): 2 g of Tween-80 and 68.3 g of deionized water were mixed at a mixing speed of 5000 rpm for 3 minutes to obtain an aqueous phase.

[0092] Step 3): The water phase in step 2) is added to the oil phase in step 1), and shear emulsification is performed at a rotation speed of 8000 rpm for 4 minutes to obtain an oil-in-water emulsion.

[0093] Step 4): 1 g of 4,4-diaminoazobenzene was added dropwise to step 4) at 35°C, 0.02 g of copper chloride was added as a catalyst, 0.2 g of azophenyl bromoisobutyrate was added as an initiator, and then 2.0 g of diethylenetriamine and 0.5 g of polyvinyl alcohol were added dropwise. Under nitrogen protection, the reaction was carried out for 1.5 hours, and then the temperature was raised to 55°C and the reaction was kept at a constant temperature for 3 hours to obtain UV-responsive agarwood oil microcapsules.

[0094] Step 5): 0.15 g of the UV-responsive agarwood oil microcapsules prepared above was added to 20 g of acrylic resin (topcoat) to obtain an acrylic resin containing agarwood oil microcapsules.

[0095] Step 6): By spraying the acrylic resin containing agarwood oil microcapsules onto the surface of the decorative panel, the coating is encapsulated twice in steps, with a coating thickness of 15 μm each time. After each spraying, UV drying is performed at a drying temperature of 58°C to obtain an antibacterial and fragrance-releasing decorative artificial board.

[0096] The difference between Comparative Example 2 and Example 1 is that in step 4), the temperature-responsive material N,N-dimethylaminoethyl methacrylate is not added.

[0097] Performance Testing

[0098] 1. SEM characterization

[0099] Figure 4This is a scanning electron microscope image of the agarwood oil microcapsules prepared in Example 1. Figure 4 It can be seen that the microcapsules prepared in the present invention have a spherical structure, and the wall material can well cover the core material.

[0100] 2. Antibacterial test

[0101] According to the requirements of JC / T 2039-2010 for antibacterial and mildew-proof wood decorative panels, the antibacterial and fragrance-releasing decorative wood-based panels prepared in Examples 1 and 2 and Comparative Examples 1 and 2 were tested for their antibacterial properties and antibacterial durability. The results are shown in Table 1.

[0102] Table 1 Antibacterial and durability test of veneer artificial board (antibacterial rate (%))

[0103]

[0104] It can be seen from the data in Table 1 that the veneer artificial boards prepared in Examples 1 to 2 have a high antibacterial rate, and the antibacterial rate does not decrease after washing 5000 times, and has a long-lasting inhibitory effect on Staphylococcus aureus and Candida albicans; while the veneer artificial boards prepared in Comparative Examples 1 to 2 have significantly poorer antibacterial rate and durability, indicating that when preparing the veneer artificial boards, some of the agarwood oil may have decomposed and released during the UV drying process, resulting in a lower content of agarwood oil in the product, and thus a decrease in the antibacterial rate and durability.

[0105] 3. Fragrance release test

[0106] The veneered artificial boards prepared in Examples 1-2 and Comparative Examples 1-2 were heated in an oven at 50° C. for 20 days to accelerate the release of fragrance, and then the fragrance intensity was tested. The results are shown in Table 2.

[0107] Table 2 Fragrance release and durability test of veneer artificial boards

[0108]

[0109] It can be seen from the data in Table 2 that the veneered artificial boards prepared in Examples 1 and 2 have a more lasting fragrance-releasing effect.

[0110] Example 3

[0111] All other conditions were the same as in Example 1, except that the agarwood oil was replaced with camphorwood essential oil or sandalwood essential oil. The resulting boards were tested for antibacterial properties and fragrance release, demonstrating that the antibacterial properties of the boards reached 99%. Even after 5,000 washes, the antibacterial properties remained at approximately 98%. After heating in an oven at 50°C for 20 days, the boards still had a noticeable fragrance.

[0112] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as within the scope of protection of the present invention.

Claims

1. A fragrance microcapsule, characterized in that: The capsule comprises a core and a wall material coated on the surface of the core; the core is an oily antibacterial fragrance substance; the wall material comprises a temperature-responsive polymer and a modified polyurea with UV response; The wall material is prepared from raw materials including hexamethylene diisocyanate, a chain extender, a temperature response molecule and a UV response molecule; the temperature response molecule is N,N-dimethylaminoethyl methacrylate, and the UV response molecule is 4,4-diaminoazobenzene.

2. The fragrance microcapsule according to claim 1, characterized in that The fragrance microcapsules include the following raw materials in mass fraction: 5% to 45% of oily antibacterial fragrance substance, 2% to 5% of hexamethylene diisocyanate, 0.4% to 2% of N,N-dimethylaminoethyl methacrylate, 0.5% to 1% of 4,4-diaminoazobenzene, 1% to 3.5% of chain extender, 0.5% to 2.5% of emulsifier, 0.2% to 0.3% of initiator, 0.5% to 2% of stabilizer, and 40% to 85% of water; the total mass fraction of each raw material is 100%.

3. The fragrance microcapsule according to claim 1 or 2, characterized in that The oily antibacterial fragrance substance includes one or more of agarwood oil, sandalwood essential oil and camphorwood essential oil.

4. The fragrance microcapsule according to claim 2, characterized in that The chain extender is diethylenetriamine; The emulsifier includes one or more of anionic surfactants and nonionic surfactants; The initiator includes one or both of azobisisobutyronitrile and azophenyl bromoisobutyrate; The stabilizer includes one or more of polyvinyl alcohol, cellulose derivatives, polyethylene oxide and acrylamide.

5. The fragrance microcapsule according to claim 2, characterized in that The raw materials for preparing the fragrance microcapsules also include a catalyst, which includes one or more of copper chloride, copper bromide, dibutyltin dilaurate and stannous octoate; the amount of the catalyst is 0.3-0.6% of the weight of the hexamethylene diisocyanate.

6. The method for preparing the fragrance microcapsules according to any one of claims 1 to 5, characterized in that: The following steps are involved: mixing the oily antibacterial fragrance substance and hexamethylene diisocyanate to obtain an oil phase; mixing an emulsifier and water to obtain an aqueous phase; adding the aqueous phase to the oil phase for emulsification to obtain an oil-in-water emulsion; Mixing N,N-dimethylaminoethyl methacrylate, a catalyst, and the oil-in-water emulsion to perform a first reaction to obtain a first reaction solution; 4,4-diaminoazobenzene, an initiator, a chain extender and a stabilizer are added to the first reaction solution to carry out a second reaction to obtain the fragrance microcapsules.

7. The preparation method according to claim 6, characterized in that The temperature of the first reaction is 30-40°C and the time is 1-3 hours; the second reaction includes a first stage and a second stage carried out sequentially, the temperature of the first stage is 30-40°C and the time is 1.5 hours, and the temperature of the second stage is 50-60°C and the time is 1-3 hours.

8. An antibacterial fragrance-releasing UV paint, characterized in that: The invention comprises UV paint resin and fragrance microcapsules; the fragrance microcapsules are the fragrance microcapsules according to any one of claims 1 to 5 or the fragrance microcapsules prepared by the preparation method according to any one of claims 6 to 7.

9. An antibacterial and fragrance-releasing veneer artificial board, characterized in that: It comprises a veneer artificial board and a paint film arranged on the surface of the veneer artificial board; the paint film is prepared from the antibacterial and fragrance-releasing UV paint according to claim 8.

10. The method for preparing the antibacterial and fragrance-releasing veneer artificial board according to claim 9, characterized in that: The following steps are involved: The antibacterial and fragrance-releasing UV paint according to claim 8 is sprayed onto the surface of the veneered artificial board to obtain the antibacterial and fragrance-releasing veneered artificial board; the number of spraying is ≥ 2 times, and UV drying is performed after each spraying.

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