Microcapsule fragrance waist-protecting sitting posture chair and preparation method thereof

Abstract

The invention discloses a microcapsule fragrance waist-protecting sitting posture chair and a preparation method thereof, and belongs to the field of functional furniture manufacturing, and the preparation method comprises the following steps: selecting a proper essence formula as a core material, adopting melamine resin or polyurea resin as a wall material, and preparing an essence microcapsule with high thermal stability through an in-situ polymerization method; carrying out melt blending granulation on the microcapsules, matrix resins such as polypropylene, polyethylene and the like and auxiliaries through a double-screw extruder to prepare aromatic master batches; mixing the aromatic master batch with common plastic particles in proportion, and processing the mixture into a hard part of the seat cushion through an injection molding machine; and finally, carrying out post-treatment, assembly and quality detection on the injection molded part, and packaging a finished product. The problems that essence in traditional perfumed plastic is easy to volatilize, high-temperature-resistant processing is not achieved, and the fragrance holding time is short are solved, the prepared waist-protecting sitting posture chair has the advantages of being lasting and stable in fragrance and excellent in slow release performance, the fragrance holding period can reach two years or above, and meanwhile the mechanical property and the processing property of a plastic base body are kept.

Description

Technical Field

[0001] This invention relates to the field of functional furniture manufacturing technology, and in particular to a microcapsule fragrance-infused lumbar support chair and its preparation method. Background Technology

[0002] As residents' living standards improve, the demand for furniture products has shifted from basic functionality to comfort, health, and overall quality. As a core piece of furniture for people who sit for long periods (such as in offices and schools), the comfort and additional functions of lumbar support chairs are becoming increasingly important. Imbuing plastic products with fragrance can mask the odor of the resin itself and release a pleasant aroma during use, achieving stress relief and mental alertness, significantly increasing the product's added value.

[0003] Traditional methods for adding fragrance to plastics mainly include coating, pressure infiltration, heat infiltration, and compounding granulation. These methods have significant drawbacks: First, fragrances are easily lost through volatilization during high-temperature processing, resulting in low retention rates. Second, fragrances are prone to chemical changes at high temperatures, which can even cause discoloration of the plastic. Third, the addition of fragrances may damage the mechanical properties of the plastic (such as tensile strength and impact strength). Fourth, fragrances evaporate quickly during product storage, resulting in short-lasting fragrance and making it difficult to meet the needs of long-term use.

[0004] Microencapsulation technology offers a feasible solution to the aforementioned problems—by encapsulating fragrances within micron-sized capsules, blending them with a plastic matrix, and then processing them, the fragrances can be effectively protected from high-temperature degradation, and the fragrance retention time can be extended through controlled release mechanisms. While existing technologies include the preparation of fragrance microcapsules using polyurea-formaldehyde as the wall material and the encapsulation of plant fragrances in melamine materials, the application of such technologies in the specific furniture category of "lumbar support chairs" has not yet been reported. Furthermore, existing microencapsulation technologies still have room for improvement in terms of thermal stability, mechanical strength, and compatibility with plastic matrices, and cannot fully meet the processing and usage requirements of lumbar support chairs. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a microcapsule fragrance-infused lumbar support chair and its preparation method, thus solving the problems mentioned in the background section.

[0006] Technical Solution: To solve the above-mentioned technical problems, according to one aspect of the present invention, more specifically, a microcapsule fragrance-infused lumbar support chair and its preparation method, including microcapsule preparation, fragrance masterbatch preparation, injection molding of seat cushion components, post-processing assembly, and quality inspection steps, with corresponding equipment systems: S1. Preparation of Fragrance Microcapsules Raw material selection: Select fragrances with a boiling range of over 150℃, good oil solubility and no indole (to avoid plastic discoloration) as core materials, specifically woody, jasmine or compound floral fragrances; Select melamine resin (melamine-formaldehyde resin) or polyurea-formaldehyde resin as wall materials, with a mass ratio of wall material to core material of (2:1) to (5:1).

[0007] Preparation process: In-situ polymerization is used to polymerize wall material monomers (such as melamine and formaldehyde) in water to form a prepolymer. Emulsifiers and pH adjusters (adjusting the pH to 7-9) are added, and fragrance is added under high-speed stirring to form an oil-in-water emulsion. Acidification is used to promote the polymerization of the wall material at the oil-water interface to form a film, forming microcapsules. After filtration, washing and drying, powdered microcapsules with a particle size of 1-50 μm, an encapsulation rate of more than 32%, and a thermal decomposition temperature of more than 200℃ are obtained.

[0008] Process parameters: The reaction temperature is controlled at 35-80℃, and the curing time is 2-4 hours.

[0009] S2. Preparation of aromatic masterbatch Raw material ratio: by weight, 75-88 parts of matrix resin, 10-20 parts of inorganic filler, 2-5 parts of microcapsule fragrance, 0.2-0.4 parts of antioxidant, and 0.5-1 parts of lubricant; wherein, the matrix resin is polypropylene, polyethylene or ABS resin, and the inorganic filler is talc powder, barium sulfate or montmorillonite with a mesh size of 2000 or higher.

[0010] Preparation process: After mixing the above raw materials, melt blending and extrusion granulation are carried out through a co-rotating twin-screw extruder; the supporting equipment includes a feeder, a co-rotating twin-screw extruder and a pelletizer.

[0011] Process parameters: extrusion temperature 180-230℃, screw speed 300-550r / min, vacuum degree -0.04 to -0.08MPa.

[0012] S3, Injection molding of seat cushion components Raw material mixing: Mix aromatic masterbatch with ordinary plastic particles at a ratio of 1:5 to 1:20.

[0013] Injection molding process: The hard parts of the seat cushion are processed by injection molding equipment (including plastic dryer, injection molding machine, and robotic part handling system); gas-assisted injection molding or multi-layer injection molding technology can be used to ensure uniform aroma distribution.

[0014] Process parameters: Injection temperature 180-210℃, injection pressure 60-100MPa.

[0015] S4, Post-processing and Assembly Post-processing: Stress relief treatment of injection molded parts (such as heat treatment at a specific temperature); Assembly: The processed injection molded parts are assembled with other seat components (such as lumbar support structure, chair frame, etc.) into finished products through an automated production line (including conveyor line and industrial robot fastening system).

[0016] S5. Quality Inspection and Packaging Testing content: The finished product is tested for aroma concentration (to ensure that the aroma intensity meets the standard), mechanical properties (tensile strength, elongation at break, impact strength) and appearance quality (no cracks or deformation); Packaging: Qualified products are packaged in air-proof materials (such as air-proof film) before being stored to prevent the aroma from evaporating prematurely.

[0017] Furthermore, the supporting equipment system for implementing the above methods includes: microcapsule preparation equipment (reaction vessel, emulsification equipment, drying equipment), twin-screw extrusion granulation equipment (feeder, co-rotating twin-screw extruder, pelletizer), injection molding equipment (plastic dryer, injection molding machine, robotic arm part handling system), post-processing equipment (stress relief treatment device), and quality testing equipment (aroma detection device, mechanical property testing equipment, appearance inspection instrument).

[0018] The beneficial effects of the microcapsule fragrance-infused lumbar support chair and its preparation method of the present invention are as follows: (1) The present invention protects the fragrance from volatilization and decomposition during high-temperature processing by microcapsule technology, with a fragrance loss rate of less than 10% (compared to 30-50% loss rate by traditional methods); through the controlled release mechanism, the product can maintain its fragrance for more than 2 years and can still maintain the stability and intensity of the fragrance under high temperature conditions.

[0019] Excellent mechanical properties: The amount of microcapsules added is only 2-5%, and they have good compatibility with the plastic matrix. They have minimal impact on the tensile strength, elongation at break, and impact strength of the plastic, ensuring the structural stability and service life of the lumbar support chair.

[0020] Wide processing adaptability: The microcapsule thermal decomposition temperature reaches over 200℃, which can be adapted to various plastic processing methods such as injection molding and extrusion, meeting the preparation needs of different parts of the lumbar support chair.

[0021] Healthy and environmentally friendly: Made with plant-based fragrances and food-grade wall materials such as melamine resin and polyurea-formaldehyde, it is non-toxic and harmless, meets national environmental protection and furniture safety standards, and avoids potential risks to human health.

[0022] High added value of the product: It gives the lumbar support chair aromatherapy function, which is different from the traditional lumbar support chair, enhances the product's market competitiveness, and meets consumers' dual needs for "health + comfort". Attached Figure Description

[0023] The present invention will now be described in further detail with reference to the accompanying drawings and specific implementation methods.

[0024] Figure 1 This is a schematic diagram of the preparation method in this invention. Detailed Implementation

[0025] The present invention will be described in detail below with reference to the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in the present application can be combined with each other.

[0026] To make the technical solution of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0027] Reference Figure 1 A microcapsule-scented lumbar support chair, comprising: Core material (jasmine fragrance): by weight per thousand parts, benzyl acetate 250-350 parts, benzyl propionate 40-65 parts, α-pentylcinnamaldehyde 30-70 parts, α-hexylcinnamaldehyde 40-60 parts, phenethyl alcohol 60-130 parts, ethyl phenylacetate 30-55 parts, linalool 135-165 parts, linalyl acetate 180-210 parts, methyl dihydrojasmonate 60-85 parts, methyl anthranilate 5-20 parts, hydroxycitronellol 45-55 parts, benzyl benzoate 145-155 parts, and antioxidant BHT 0.2-0.8 parts (to prevent fragrance oxidation, inhibit the oxidation and deterioration of the core material during storage and high-temperature processing, the amount should be appropriate to the total weight of the fragrance, and avoid excessive use which will affect the purity of the fragrance); Wall material: Melamine resin (melamine-formaldehyde resin); Matrix resin: random copolymer polypropylene (melt index 20 g / 10 min); Fillers and additives: 3000 mesh barium sulfate (inorganic filler), antioxidant DLTP, polyethylene wax (lubricant); Equipment: Reactor, emulsifier, vacuum dryer, co-rotating twin-screw extruder, injection molding machine, heat treatment equipment, aroma detection device, mechanical property tester.

[0028] According to another aspect of the present invention, and more specifically a method for preparing a microcapsule fragrance-infused lumbar support chair, referring to... Figure 1 The preparation steps include the following: S1. Preparation of Fragrance Microcapsules By weight, 10 parts melamine, 15 parts formaldehyde, and 75 parts distilled water were stirred at 24°C for 24 hours under nitrogen protection. The pH was adjusted to 9 with 5% sodium carbonate solution, and the mixture was heated to 80°C and stirred at high speed for 30 minutes to obtain melamine prepolymer solution. Dissolve 5 parts of jasmine fragrance in a mixture of 30 parts of ethanol and 65 parts of distilled water, and disperse at high speed for 10 minutes to obtain a fragrance solution. The fragrance solution and melamine prepolymer were mixed at a weight ratio of 1:4 and stirred at high speed for 30 minutes under nitrogen protection to carry out the microencapsulation reaction. After the reaction was completed, the microcapsules were separated by filtration, washed three times with ethanol, and dried under vacuum at 23°C for 72 h to obtain powdered jasmine fragrance microcapsules (particle size 10-30 μm, encapsulation rate 35%, thermal decomposition temperature 210°C).

[0029] S2. Preparation of aromatic masterbatch By weight, 75 parts of random copolymer polypropylene, 10 parts of 3000 mesh barium sulfate, 5 parts of the above microcapsules, 0.2 parts of antioxidant DLTP, and 1 part of polyethylene wax are mixed evenly. The mixed raw materials were added to a co-rotating twin-screw extruder, and the extrusion temperature was set to 230℃, the screw speed to 550r / min, and the vacuum degree to -0.08MPa. After melt blending, the mixture was extruded, cooled, and pelletized to obtain aromatic masterbatch.

[0030] S3, Injection molding of seat cushion components Aromatic masterbatch is mixed with ordinary random copolymer polypropylene particles at a weight ratio of 1:5; The mixed particles are added to the injection molding machine (with a plastic dryer), the injection temperature is set to 210℃ and the injection pressure to 100MPa, and the injection is molded into the hard part of the seat cushion of the lumbar support chair; the injection molded part is removed by a robotic arm part removal system.

[0031] S4, Post-processing and Assembly The injection molded parts were heat-treated in a 70℃ oven for 1 hour to remove internal stress. Through an automated assembly line, the stress-relieved seat cushion components are assembled with the lumbar support structure, chair frame, armrests, and other components. Industrial robots are used to tighten the screws to form a complete lumbar support chair.

[0032] S5. Quality Inspection and Packaging Aroma testing: The aroma concentration of the finished product is evaluated by a team of professional fragrance evaluators (standard: the jasmine fragrance can be clearly smelled at a distance of 30cm from the seat). Mechanical performance testing: The tensile strength (≥25MPa) and impact strength (≥4kJ / m²) of the seat cushion components were tested, and both met the standards for furniture plastic components. Appearance inspection: The seat cushion was inspected for cracks, deformation, color difference, and a smooth surface; Packaging: Qualified products are sealed in airtight packaging with a breathable film and stored in the warehouse.

[0033] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention. Therefore, the scope of protection of this patent should be determined by the appended claims.

Claims

1. A method for preparing a microcapsule fragrance waist support sitting chair, characterized in that, It comprises the following steps: S1, preparation of fragrance microcapsules: select a fragrance with boiling point higher than 150℃, good oil solubility and no indole as the core material, and melamine resin or polyurea-formaldehyde resin as the wall material, the mass ratio of wall material to core material is (2:1) to (5:1); prepare the fragrance microcapsules by in-situ polymerization, control the reaction temperature at 35-80℃, adjust the pH value to 7-9, and the curing time is 2-4 hours; the prepared microcapsules have a particle size of 1-50μm, an embedding rate of more than 32%, and a thermal decomposition temperature of more than 200℃; S2, preparation of aromatic masterbatch: mix the fragrance microcapsules prepared in the above step with base resin, inorganic filler, antioxidant, and lubricant according to the weight ratio, the weight ratio is: base resin 75-88 parts, inorganic filler 10-20 parts, microcapsule fragrance 2-5 parts, antioxidant 0.2-0.4 parts, and lubricant 0.5-1 part; melt extrude, cool and granulate through a twin-screw extruder, control the extrusion temperature at 180-230℃, the screw speed at 300-550r / min, and the vacuum degree at -0.04 to -0.08MPa; S3, injection molding of cushion component: mix the aromatic masterbatch with ordinary plastic particles at a ratio of 1:5 to 1:20, process the cushion hard component through an injection molding machine, the injection temperature is 180-210℃, and the injection pressure is 60-100MPa; S4, post-treatment and assembly: stress relief treatment is performed on the injection-molded part, and it is assembled with other components of the seat to form a finished product; S5, quality detection and packaging: the finished product is detected for aroma concentration, mechanical properties and appearance quality, and the qualified products are packaged with air-tight materials and stored in the warehouse.

2. The preparation method of the microcapsule fragrance waist support sitting posture chair according to claim 1, characterized in that, The fragrance in step S1 is wood type, jasmine type or composite floral type.

3. The method for preparing a microcapsule fragrance-infused lumbar support chair according to claim 2, characterized in that, The base resin in step S2 is polypropylene, polyethylene or ABS resin; the inorganic filler is talc powder, barium sulfate or montmorillonite with mesh size of 2000 or more.

4. The method for preparing a microcapsule fragrance-infused lumbar support chair according to claim 3, characterized in that, The cushion hard component in step S3 is processed by gas-assisted injection molding or multi-layer injection molding technology.

5. The method for preparing a microcapsule fragrance-infused lumbar support chair according to claim 4, characterized in that, It also comprises a complete equipment system, which comprises a microcapsule preparation device, a twin-screw extrusion granulation device, an injection molding device, a post-treatment device and a quality detection device; The microcapsule preparation device comprises a reaction kettle, an emulsification device and a drying device; The twin-screw extrusion granulation device comprises a feeding machine, a co-rotating twin-screw extruder and a pelletizer; The injection molding device comprises a plastic dryer, an injection molding machine and a mechanical hand picking system.

6. A microcapsule fragrance lumbar support sitting posture chair, which is prepared by using the preparation method of the microcapsule fragrance lumbar support sitting posture chair according to claim 5. The aroma release time of the lumbar support chair is more than 2 years, the aroma stability and intensity can be maintained in high temperature environment, and the tensile strength of the cushion hard component is ≥25MPa and the impact strength is ≥4kJ / m².

Images