Mosquito repelling tablecloth and method of making the same

Abstract

This invention discloses a mosquito-repellent tablecloth and its preparation method, belonging to the field of functional materials technology. This invention disperses the mosquito-repellent active ingredient in the form of component A masterbatch in a carrier resin, and introduces component B masterbatch containing a modified silica-loaded synergist. This achieves rapid release and long-lasting sustained release synergistic effects of the active ingredient, avoiding the problem of easy attenuation of effects in traditional spraying or impregnation methods. The A and B masterbatches are then melt-cast with the carrier resin to form a film, exhibiting excellent formulation compatibility. The resulting tablecloth possesses good flexibility, folding resistance, and anti-aging capabilities, slowing down the photolysis and thermal degradation of the active ingredient. Simultaneously, the active ingredient is encapsulated within the polymer matrix, eliminating the need for mosquito coils or electric mosquito repellents, producing no smoke or odor, and meeting the high safety and hygiene requirements of tableware.

Description

Technical Field

[0001] This invention relates to the field of functional materials technology, and more specifically, to a mosquito-repellent tablecloth and its preparation method. Background Technology

[0002] Tablecloths are widely used household items in daily life, primarily serving to prevent stains, decorate, and protect the dining table. However, in outdoor dining, picnics, and terrace dining settings, mosquito bites severely disrupt the dining experience and may even transmit diseases. Currently, common mosquito prevention methods on the market include spraying mosquito repellent, burning mosquito coils, and using electric mosquito repellents, but these methods have many drawbacks: mosquito repellent requires frequent application and may pose safety hazards due to contact with food; mosquito coils produce smoke and odors that are unfriendly to people with respiratory sensitivities and are unsuitable for dining environments. Therefore, developing a multifunctional product that combines the basic functions of a tablecloth with mosquito repellent effects is of significant practical importance.

[0003] In recent years, there have been attempts to incorporate mosquito-repellent ingredients into plastic products. For example, Taiwan Patent Publication No. 2011 / 027283 discloses a method for manufacturing insect-repellent polyolefin fibers. This involves mixing mosquito repellent into low-density polyethylene to prepare a masterbatch, which is then filament-drawn and woven to form a fabric with insect-repellent properties. Chinese Patent CN102828269A discloses a method for preparing a textile fabric with mosquito-repellent and insect-killing functions, which involves mixing polyethylene, insecticide materials, and additives, followed by filament-drawing and weaving. Chinese Patent CN107175803A discloses a mosquito-repellent essential oil mat, which uses a three-layer co-extrusion casting process to prepare a film containing plant essential oils. Furthermore, existing research has used polyethylene as a carrier for mosquito-repellent active ingredients, preparing polymer materials containing mosquito repellents through melt extrusion, utilizing the slow-release properties of polymers to achieve long-lasting mosquito repellency. Fujian Normal University and other institutions have developed a masterbatch for agricultural plastic films with insect-repellent functions. These films are produced using a blow molding process for use as farmland mulch, effectively repelling various pests.

[0004] However, introducing mosquito repellent function into tablecloth products still faces the following technical problems: (1) Existing mosquito repellent plastic products are mostly used in agricultural film, mosquito nets, fibers and other fields. There is still no special product for the specific application scenario of tablecloths for dining tables; (2) Traditional methods load mosquito repellents onto the surface of fabrics by surface spraying or impregnation. The mosquito repellent components are easy to volatilize and fall off, and the mosquito repellent effect is difficult to last; (3) Some chemical mosquito repellents (such as DEET) have a corrosive and dissolving effect on plastics or synthetic fibers. Direct blending may lead to a decrease in the physical properties of the product or uneven precipitation of the mosquito repellent; (4) Tablecloths for dining tables need to take into account the requirements of non-toxic safety, good flexibility and easy cleaning, which puts forward higher requirements for the fluidity and processing adaptability of materials.

[0005] Therefore, developing a mosquito-repellent tablecloth that stably encapsulates mosquito-repellent active ingredients in a polyethylene matrix and is directly prepared through an integrated molding process avoids the problem of insufficient durability of traditional coating methods and achieves an organic integration of mosquito-repellent function and tablecloth function, which has significant market value and application prospects. Summary of the Invention

[0006] In view of this, in order to solve one of the above-mentioned technical problems, the present invention provides a mosquito-repellent tablecloth and its preparation method, the specific technical solution of which is as follows: A mosquito-repellent tablecloth, wherein the tablecloth is prepared from raw materials including component A masterbatch, component B masterbatch, and carrier resin, wherein... The masterbatch of component A comprises the following raw materials in parts by weight: 60-80 parts of carrier resin, 10-20 parts of active ingredient, 1-3 parts of auxiliary agent, 0.1-1 part of light stabilizer, 5-10 parts of heat stabilizer, 0.5-2 parts of dispersant A, and 0.1-0.5 parts of surface migration modifier; The masterbatch of component B comprises the following raw materials in parts by weight: 65-80 parts of carrier resin, 10-25 parts of slow-release additive, 10-30 parts of dispersant B1, and 5-10 parts of compatibilizer.

[0007] Furthermore, the carrier resin is at least one of low-density polyethylene, linear low-density polyethylene, high-density polyethylene, and ethylene-vinyl acetate copolymer.

[0008] Furthermore, the active ingredient is at least one of cis-cypermethrin, icoplanin, N-octylacetamide, DEET, IR3535, permethrin, tetrafluorobenzylpyrrolizate, d-aminopyrethrin, and plant essential oils.

[0009] Furthermore, the adjuvant is at least one of bisabolol, dipotassium glycyrrhizate, and aloe extract.

[0010] Furthermore, the light stabilizer is the hindered amine light stabilizer HALS-944.

[0011] Furthermore, the heat stabilizer is at least one of antioxidant 1010, antioxidant 168, and calcium stearate.

[0012] Furthermore, the dispersant A is at least one of polyethylene wax and ethylene bis-stearamide.

[0013] Furthermore, the surface migration modifier is erucamide.

[0014] Furthermore, the slow-release additive is a modified silica-loaded synergist.

[0015] In addition, the present invention also provides a method for preparing a mosquito-repellent tablecloth, the method comprising the following steps: S1. The carrier resin, active ingredients, auxiliary agents, light stabilizers, heat stabilizers, dispersant A, and surface migration modifier are mixed evenly, melt-extruded at 130~160℃ using a twin-screw extruder, and granulated to obtain component A masterbatch; S2. Mix the carrier resin, slow-release additive, dispersant B and compatibilizer evenly, and then melt-extrude and granulate the mixture using a twin-screw extruder at 130~160℃ to obtain component B masterbatch. S3. Mix the masterbatch of component A and the masterbatch of component B evenly to obtain the mixed masterbatch; S4. The mixed masterbatch and carrier resin are mixed evenly, and then melt-extruded, cast, or blow-molded at 130~160℃ using a twin-screw extruder to obtain a mosquito-repellent tablecloth.

[0016] Compared with the prior art, the present invention has the following beneficial effects: 1. This invention disperses the active ingredients in the carrier resin in the form of masterbatch and introduces slow-release additives, thereby achieving the slow release and long-lasting stability of the mosquito-repellent active ingredients in the tablecloth. This avoids the problem of rapid decline in mosquito-repellent effect caused by volatilization and shedding in traditional spraying or impregnation methods, enabling the tablecloth to maintain effective mosquito-repellent function for a long time in outdoor dining, picnics and other scenarios.

[0017] 2. The masterbatch of component A of this invention provides a rapidly released mosquito-repellent active ingredient, while the slow-release additive (modified silica-loaded N-octylacetamide) in the masterbatch of component B can achieve a long-lasting slow-release and synergistic effect. The synergy between the two allows the tablecloth to have both an initial rapid mosquito-repellent effect and ensure its application mechanical properties, maintaining long-term protection. Its overall performance is superior to that of a single-component system.

[0018] 3. This invention separates the mosquito-repellent functional components into component A masterbatch and component B masterbatch, mixes them, and then melts and casts them with a carrier resin to form a film. The overall formula has excellent compatibility, and the resulting tablecloth has good flexibility and folding resistance, making it easy to lay out and clean. At the same time, the optimized formula significantly improves the tablecloth's anti-aging ability under outdoor sunlight and high temperature environments, slows down the photolysis and thermal degradation of the mosquito-repellent active ingredients, and extends the effective service life of the product.

[0019] 4. This invention adds active ingredients to the masterbatch of component A and encapsulates the active ingredients in the polymer matrix through melt blending. It eliminates the need for auxiliary equipment such as mosquito coils and electric mosquito repellents, produces no smoke or odor, is friendly to people with respiratory sensitivities, and meets the high requirements for safety and hygiene of tableware. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to its embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and do not limit the scope of protection of the invention.

[0021] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0022] An embodiment of the present invention provides a mosquito-repellent tablecloth, wherein the raw materials for preparing the tablecloth include component A masterbatch, component B masterbatch, and carrier resin, wherein... The masterbatch of component A comprises the following raw materials in parts by weight: 60-80 parts of carrier resin, 10-20 parts of active ingredient, 1-3 parts of auxiliary agent, 0.1-1 part of light stabilizer, 5-10 parts of heat stabilizer, 0.5-2 parts of dispersant A, and 0.1-0.5 parts of surface migration modifier; The masterbatch of component B comprises the following raw materials in parts by weight: 65-80 parts of carrier resin, 10-25 parts of slow-release additive, 10-30 parts of dispersant B1, and 5-10 parts of compatibilizer.

[0023] In one embodiment, the carrier resin is at least one of low-density polyethylene, linear low-density polyethylene, high-density polyethylene, and ethylene-vinyl acetate copolymer.

[0024] In one embodiment, the active ingredient is at least one of cis-cypermethrin, icoplanin, N-octylacetamide, DEET, IR3535, permethrin, tetrafluorobenzylpyrrolizide, d-aminopyrethrin, and plant essential oil.

[0025] In one embodiment, the adjuvant is at least one of bisabolol, dipotassium glycyrrhizate, and aloe extract.

[0026] In one embodiment, the light stabilizer is the hindered amine light stabilizer HALS-944.

[0027] In one embodiment, the heat stabilizer is at least one of antioxidant 1010, antioxidant 168, and calcium stearate.

[0028] In one embodiment, the dispersant A is at least one of polyethylene wax and ethylene bis-stearamide.

[0029] In one embodiment, the surface migration modifier is erucamide.

[0030] In one embodiment, the slow-release additive is a modified silica-loaded synergist.

[0031] In one embodiment, the synergist is N-octylacetamide.

[0032] In one embodiment, the modified silica-supported synergist is prepared by: Silica was added to an ethanol aqueous solution, followed by the addition of a silane coupling agent accounting for 1-5% of the silica mass. The mixture was stirred at 100-300 r / min and 60-80°C for 1-3 h. After washing and drying, modified silica was obtained. Modified silica and N-octylacetamide were dispersed in ethanol and stirred at 100-300 rpm for 1-2 hours. After drying, the mixture was added to an ethyl acetate solution of polymethyl methacrylate and stirred at 50-100 rpm for 10-30 minutes. After filtration, the mixture was dried at 50-65°C to obtain the modified silica-loaded synergist. The modified silica-loaded synergist prepared in this invention loads the synergist (such as N-octylacetamide) into the porous structure of modified silica and further encapsulates it with polymethyl methacrylate. During tablecloth use, the synergist must first penetrate the outer layer of the polymer and then slowly diffuse through the silica channels to the surface of the resin matrix, thereby significantly slowing down the release rate and achieving a long-lasting mosquito-repellent effect for weeks or even months. This effectively solves the problems of easy volatility and short-lasting effect of small-molecule mosquito-repellent ingredients. In addition, during melt extrusion, the synergist is loaded inside the modified silica and encapsulated by the polymer, which blocks its thermal volatilization path and significantly improves its thermal stability.

[0033] In one embodiment, the volume ratio of ethanol to water in the aqueous ethanol solution is 7:3.

[0034] In one embodiment, the weight ratio of the silica to the aqueous ethanol solution is (10~20):(25~50).

[0035] In one embodiment, the weight ratio of the modified silica to N-octylacetamide is (7~15):(3~10).

[0036] In one embodiment, the polymethacrylate ethyl acetate solution contains 20-30% polymethacrylate by mass.

[0037] In one embodiment, the silane coupling agent is at least one of γ-mercaptopropyltrimethoxysilane, γ-mercaptopropyltriethoxysilane, and 3-aminopropyltriethoxysilane.

[0038] In one embodiment, the dispersant B is at least one of montan wax and polyester wax.

[0039] In one embodiment, the compatibilizer is an ethylene-vinyl acetate copolymer.

[0040] In addition, the present invention also provides a method for preparing a mosquito-repellent tablecloth, the method comprising the following steps: S1. The carrier resin, active ingredients, auxiliary agents, light stabilizers, heat stabilizers, dispersant A, and surface migration modifier are mixed evenly, melt-extruded at 130~160℃ using a twin-screw extruder, and granulated to obtain component A masterbatch; S2. Mix the carrier resin, slow-release additive, dispersant B and compatibilizer evenly, and then melt-extrude and granulate the mixture using a twin-screw extruder at 130~160℃ to obtain component B masterbatch. S3. Mix the masterbatch of component A and the masterbatch of component B evenly to obtain the mixed masterbatch; S4. The mixed masterbatch and carrier resin are mixed evenly, and then melt-extruded, cast, or blow-molded at 130~160℃ using a twin-screw extruder to obtain a mosquito-repellent tablecloth.

[0041] In one embodiment, in step S3, the weight ratio of the A component masterbatch to the B component masterbatch is (1~5):(1~5).

[0042] In one embodiment, in step S4, the weight ratio of the mixed masterbatch to the carrier resin is (3~10):(90~97).

[0043] The mosquito-repellent tablecloth described above achieves long-lasting sustained release and synergistic effect of active ingredients through the compounding of A and B component masterbatches and an integrated molding process. This results in a long-lasting mosquito-repellent effect while avoiding the problem of easy peeling of traditional coatings. The use of safe and low-toxicity active ingredients and auxiliary agents, combined with encapsulation protection, significantly reduces the risk of contact during table use. Furthermore, the addition of light and heat stabilizers and surface migration modifiers improves material compatibility and weather resistance, ensuring the tablecloth is flexible, fold-resistant, and does not easily leach out. The overall manufacturing process is simple, suitable for industrial production, and possesses both good practicality and market prospects.

[0044] The implementation schemes of the present invention will now be described in detail with reference to specific embodiments.

[0045] Example 1: A method for preparing a mosquito-repellent tablecloth includes the following steps: S1. By weight, 75 parts of linear low-density polyethylene, 15 parts of cis-cypermethrin, 1 part of bisabolol, 0.5 parts of hindered amine light stabilizer HALS-944, 7.5 parts of antioxidant 1010, 0.7 parts of polyethylene wax and 0.3 parts of erucamide are mixed evenly, melt-extruded at 130~160℃ using a twin-screw extruder, and granulated to obtain component A masterbatch; S2. By weight, 70 parts of linear low-density polyethylene, 15 parts of modified silica-loaded synergist, 10 parts of montan wax and 5 parts of ethylene-vinyl acetate copolymer are mixed evenly, melt-extruded and granulated by a twin-screw extruder at 130~160℃ to obtain component B masterbatch; The modified silica-supported synergist is prepared by adding 20 parts by weight of silica to 30 parts by weight of ethanol aqueous solution (the volume ratio of ethanol to water is 7:3), then adding γ-mercaptopropyltrimethoxysilane accounting for 3% of the silica mass, stirring at 300 r / min at 65°C for 2 h, and then washing and drying to obtain modified silica. By weight, 15 parts of modified silica and 5 parts of N-octylacetamide were dispersed in 30 parts of ethanol and stirred at 200 r / min for 1 h. After drying, 30 parts of ethyl acetate solution of polymethyl methacrylate with a mass percentage of 25% were added and stirred at 100 r / min for 20 min. After filtration, the mixture was dried at 65 °C to obtain the modified silica-supported synergist. S3. Mix the A component masterbatch and the B component masterbatch in a weight ratio of 1:1 until homogeneous to obtain a mixed masterbatch; S4. By weight, 5 parts of the above-mentioned mixed masterbatch are mixed evenly with 95 parts of linear low-density polyethylene, and then melt-extruded and blow-molded at 130~160℃ using a twin-screw extruder to obtain a mosquito-repellent tablecloth.

[0046] Example 2: A method for preparing a mosquito-repellent tablecloth includes the following steps: S1. By weight, 72 parts of linear low-density polyethylene, 18 parts of cis-cypermethrin, 1.5 parts of bisabolol, 0.5 parts of hindered amine light stabilizer HALS-944, 7 parts of antioxidant 1010, 0.5 parts of polyethylene wax and 0.5 parts of erucamide are mixed evenly, melt-extruded at 130~160℃ using a twin-screw extruder, and granulated to obtain component A masterbatch; S2. By weight, 68 parts of linear low-density polyethylene, 17 parts of modified silica-loaded synergist, 10 parts of montan wax and 5 parts of ethylene-vinyl acetate copolymer are mixed evenly, melt-extruded and granulated by a twin-screw extruder at 130~160℃ to obtain component B masterbatch. The modified silica-supported synergist is prepared by adding 20 parts by weight of silica to 30 parts by weight of ethanol aqueous solution (the volume ratio of ethanol to water is 7:3), then adding γ-mercaptopropyltrimethoxysilane accounting for 3% of the silica mass, stirring at 300 r / min at 65°C for 2 h, and then washing and drying to obtain modified silica. By weight, 15 parts of modified silica and 7 parts of N-octylacetamide were dispersed in 30 parts of ethanol and stirred at 200 r / min for 1.5 h. After drying, 30 parts of ethyl acetate solution of polymethyl methacrylate with a mass percentage of 25% were added and stirred at 100 r / min for 25 min. After filtration, the mixture was dried at 65 °C to obtain the modified silica-supported synergist. S3. Mix the A component masterbatch and the B component masterbatch in a weight ratio of 1:1 until homogeneous to obtain a mixed masterbatch; S4. By weight, 4 parts of the above-mentioned mixed masterbatch are mixed evenly with 96 parts of linear low-density polyethylene, and then melt-extruded and blow-molded at 130~160℃ using a twin-screw extruder to obtain a mosquito-repellent tablecloth.

[0047] Example 3: A method for preparing a mosquito-repellent tablecloth includes the following steps: S1. By weight, 70 parts of linear low-density polyethylene, 20 parts of cis-cypermethrin, 2 parts of bisabolol, 0.5 parts of hindered amine light stabilizer HALS-944, 6.5 parts of antioxidant 1010, 0.6 parts of polyethylene wax and 0.4 parts of erucamide are mixed evenly, melt-extruded at 130~160℃ using a twin-screw extruder, and granulated to obtain component A masterbatch; S2. By weight, 70 parts of linear low-density polyethylene, 15 parts of modified silica-loaded synergist, 10 parts of montan wax and 5 parts of ethylene-vinyl acetate copolymer are mixed evenly, melt-extruded and granulated by a twin-screw extruder at 130~160℃ to obtain component B masterbatch; The modified silica-supported synergist is prepared by adding 20 parts by weight of silica to 30 parts by weight of ethanol aqueous solution (the volume ratio of ethanol to water is 7:3), then adding γ-mercaptopropyltrimethoxysilane accounting for 3% of the silica mass, stirring at 300 r / min at 65°C for 2 h, and then washing and drying to obtain modified silica. By weight, 15 parts of modified silica and 8 parts of N-octylacetamide were dispersed in 30 parts of ethanol and stirred at 200 r / min for 1 h. After drying, 30 parts of ethyl acetate solution of polymethyl methacrylate with a mass percentage of 25% were added and stirred at 100 r / min for 25 min. After filtration, the mixture was dried at 65 °C to obtain the modified silica-supported synergist. S3. Mix the A component masterbatch and the B component masterbatch in a weight ratio of 1:1 until homogeneous to obtain a mixed masterbatch; S4. By weight, 5 parts of the above-mentioned mixed masterbatch are mixed evenly with 95 parts of linear low-density polyethylene, and then melt-extruded and blow-molded at 130~160℃ using a twin-screw extruder to obtain a mosquito-repellent tablecloth.

[0048] Comparative Example 1: The difference between Comparative Example 1 and Example 3 is that cis-cypermethrin (the active ingredient) was not added to the A component masterbatch of Comparative Example 1, while the rest was the same as Example 3.

[0049] Comparative Example 2: The difference between Comparative Example 2 and Example 3 is that Comparative Example 2 does not contain component B masterbatch (i.e., 5 parts of component A masterbatch are mixed with 95 parts of linear low-density polyethylene to prepare the tablecloth), otherwise it is the same as Example 3.

[0050] Comparative Example 3: The difference between Comparative Example 3 and Example 3 is that the preparation method of the B component masterbatch in Comparative Example 3 is different, while the rest is the same as in Example 3. The preparation method of component B masterbatch in Comparative Example 3 is as follows: 70 parts by weight of linear low-density polyethylene, 10 parts by weight of silica, 5 parts by weight of N-octylacetamide, 10 parts by weight of montan wax and 5 parts by weight of ethylene-vinyl acetate copolymer are mixed evenly, melt-extruded and granulated by twin-screw extruder at 130~160℃ to obtain component B masterbatch.

[0051] Comparative Example 4: The difference between Comparative Example 4 and Example 3 is that the preparation method of the modified silica-supported synergist in Comparative Example 4 is different, while the rest is the same as in Example 3. The modified silica-supported synergist in Comparative Example 4 was prepared as follows: 20 parts by weight of silica were added to 30 parts by weight of ethanol aqueous solution (the volume ratio of ethanol to water was 7:3), and then γ-mercaptopropyltrimethoxysilane accounting for 3% of the mass of silica was added. The mixture was stirred at 300 r / min at 65 °C for 2 h. After washing and drying, the modified silica was obtained. By weight, 15 parts of modified silica and 8 parts of N-octylacetamide were dispersed in 30 parts of ethanol, stirred at 200 r / min for 1 h, and dried to obtain modified silica-loaded synergist.

[0052] Comparative Example 5: The difference between Comparative Example 5 and Example 3 is that Comparative Example 5 does not contain component A masterbatch (i.e., 5 parts of component B masterbatch are mixed with 95 parts of linear low-density polyethylene to prepare the tablecloth), otherwise it is the same as Example 3.

[0053] Comparative Example 6: Compared with Example 3, the preparation method of the mosquito-repellent tablecloth in Comparative Example 6 is as follows: 140 parts of linear low-density polyethylene, 20 parts of cis-cypermethrin, 15 parts of modified silica-loaded synergist, 2 parts of bisabolol, 0.5 parts of hindered amine light stabilizer HALS-944, 6.5 parts of antioxidant 1010, 0.6 parts of polyethylene wax, 0.4 parts of erucamide, 10 parts of montan wax, and 5 parts of ethylene-vinyl acetate copolymer were mixed evenly and then melt-extruded at 130~160℃ using a twin-screw extruder and blow-molded to obtain a mosquito-repellent tablecloth.

[0054] I. The thickness of the mosquito-repellent tablecloth samples prepared in Examples 1-3 and Comparative Examples 1-6 was 0.5 mm. Tensile strength and elongation at break were tested according to GB / T 1040.3-2006, using Type I specimens at a tensile speed of 200 mm / min. Aging resistance test: The samples were placed in a 40℃ oven for accelerated aging for 7 days, and the presence of white powdery or waxy exudates (blooming) on ​​the surface was observed. The performance results are shown in Table 1 below.

[0055] Table 1: Performance Test Results

[0056] Analysis of the data in Table 1 shows that the mosquito-repellent tablecloths prepared in Examples 1-3 have excellent mechanical properties, and after aging resistance testing, no white powdery or waxy exudates (no blooming phenomenon) were observed on the surface. This indicates that the tablecloths prepared by the stepwise blending and integrated molding process of component A and component B masterbatches of the present invention have good mechanical properties and anti-aging stability. The active ingredients, additives and carrier resin have good compatibility, and no significant migration or precipitation occurred during melt processing and thermal aging. Compared with Example 3, no active ingredients were added to component A masterbatch in Comparative Example 1, and the effect on mechanical properties and aging resistance was not significant; Comparative Example 2 did not contain component B masterbatch, but the mechanical properties were affected, indicating that the modified silica-loaded synergist and compatibilizer in component B masterbatch can improve the processing performance of the resin in the system, which helps to improve the mechanical properties of the tablecloth. In Comparative Example 3, component B directly mixed silica and N-octylacetamide without loading or coating. The unmodified silica had poor compatibility with the resin, and the small N-octylacetamide molecules easily migrated to the surface during thermal aging, forming blooms and disrupting the matrix continuity, resulting in mechanical properties inferior to Example 3. In Comparative Example 4, the modified silica-loaded synergist was not coated with polymethyl methacrylate. Although the modified silica itself had some compatibility, the lack of a polymer outer layer affected its sustained-release effect. Comparative Example 5 did not contain component A masterbatch, and its mechanical properties were slightly worse than Example 3, indicating that compounding with component B masterbatch had a positive effect on mechanical properties. In Comparative Example 6, various functional additives (especially small molecule active ingredients and synergists) were unevenly dispersed during the one-time high-shear, high-temperature melting process, with some agglomeration or thermal degradation, accelerating surface migration during subsequent aging, resulting in significantly inferior mechanical properties compared to Example 3.

[0057] II. The thickness of the mosquito-repellent tablecloth samples prepared in Examples 1-3 and Comparative Examples 1-6 was 0.5 mm. Biological testing method: The box test was used. A test cage was placed in a 70cm×70cm×70cm transparent glass box, and the number of times the sample landed within 30 minutes was recorded to calculate the repellency rate. The samples were also tested again after being stored at room temperature (25±2℃) for 30 days and 90 days. The results are shown in Table 2 below.

[0058] Table 2: Mosquito Repellent Effect

[0059] Analysis of the data in Table 2 shows that the tablecloth prepared by this invention has excellent mosquito-repellent effect and can achieve long-term slow-release mosquito repellency. Compared with Example 3, the A component masterbatch in Comparative Example 1 did not contain any active ingredient, resulting in extremely poor repellency, indicating that the active ingredient is essential for achieving the repellency effect. Comparative Example 2 lacked the B component masterbatch, indicating that without a slow-release system, the active ingredient was released too quickly, resulting in poor persistence. In Comparative Example 3, uncoated silica was directly mixed with N-octylacetamide, and the synergist did not form an effective slow-release structure, resulting in partial loss during heat processing and failure to achieve a slow-release effect during use. In Comparative Example 4, the modified silica-loaded synergist was prepared using a different method, leading to a less effective effect than Example 3, indicating that the outer coating plays a positive role in extending the release path and improving thermal stability. Comparative Example 5 lacked the A component masterbatch, and although it had a certain slow-release effect, the lack of active ingredient resulted in a significantly worse repellency effect than Example 3. In Comparative Example 6, all components were blended, resulting in uneven dispersion of active ingredients, partial pyrolysis, and a lack of synergistic release mechanism of components A and B, making the durability significantly inferior to that of Example 3.

[0060] In summary, this invention prepares mosquito-repellent active ingredients and slow-release synergists as A and B component masterbatches, respectively, which are then melt-blended with a carrier resin and cast or blow-molded to obtain a tablecloth with both good mechanical properties and long-lasting mosquito-repellent effect. Component A masterbatch provides rapidly released mosquito-repellent active ingredients, while component B masterbatch uses modified silica loaded with synergists and is coated with a polymer to achieve slow release and synergistic effect of the active ingredients. This effectively avoids the problems of short-lasting mosquito-repellent effect and easy migration and precipitation of small molecules found in traditional spraying or impregnation methods. The results of the examples show that the tablecloth has an initial repellency rate of over 96%, which remains at around 85% after 90 days of storage. Furthermore, its tensile strength exceeds 17 MPa, and there is no surface precipitation, demonstrating significantly better overall performance than the comparative example. This preparation process is simple, suitable for industrial production, and meets the needs of outdoor dining and other scenarios for tablecloths that are safe, flexible, and provide long-lasting mosquito repellency.

[0061] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0062] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. 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 all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.

Claims

1. A mosquito-repellent tablecloth, characterized in that, The tablecloth is prepared from raw materials including component A masterbatch, component B masterbatch, and carrier resin, wherein, The masterbatch of component A comprises the following raw materials in parts by weight: 60-80 parts of carrier resin, 10-20 parts of active ingredient, 1-3 parts of auxiliary agent, 0.1-1 part of light stabilizer, 5-10 parts of heat stabilizer, 0.5-2 parts of dispersant A, and 0.1-0.5 parts of surface migration modifier; The masterbatch of component B comprises the following raw materials in parts by weight: 65-80 parts of carrier resin, 10-25 parts of slow-release additive, 10-30 parts of dispersant B1, and 5-10 parts of compatibilizer.

2. The tablecloth according to claim 1, characterized in that, The carrier resin is at least one of low-density polyethylene, linear low-density polyethylene, high-density polyethylene, and ethylene-vinyl acetate copolymer.

3. The tablecloth according to claim 1, characterized in that, The active ingredient is at least one of the following: cis-cypermethrin, icoplanin, N-octylacetamide, DEET, IR3535, ethoxysulfuron, tetrafluorobenzylpyrrolizate, d-aminopyrethrin, and plant essential oil.

4. The tablecloth according to claim 1, characterized in that, The adjuvant is at least one of bisabolol, dipotassium glycyrrhizate, and aloe extract.

5. The tablecloth according to claim 1, characterized in that, The light stabilizer is the hindered amine light stabilizer HALS-944.

6. The tablecloth according to claim 1, characterized in that, The heat stabilizer is at least one of antioxidant 1010, antioxidant 168, and calcium stearate.

7. The tablecloth according to claim 1, characterized in that, The dispersant A is at least one of polyethylene wax and ethylene bis-stearamide.

8. The tablecloth according to claim 1, characterized in that, The surface migration modifier is erucamide.

9. The tablecloth according to claim 1, characterized in that, The slow-release additive is a modified silica-loaded synergist.

10. A method for preparing a mosquito-repellent tablecloth, characterized in that, The preparation method is used to prepare the mosquito-repellent tablecloth as described in any one of claims 1 to 9, and the preparation method includes the following steps: S1. The carrier resin, active ingredients, auxiliary agents, light stabilizers, heat stabilizers, dispersant A, and surface migration modifier are mixed evenly, melt-extruded at 130~160℃ using a twin-screw extruder, and granulated to obtain component A masterbatch; S2. Mix the carrier resin, slow-release additive, dispersant B and compatibilizer evenly, and then melt-extrude and granulate the mixture using a twin-screw extruder at 130~160℃ to obtain component B masterbatch. S3. Mix the masterbatch of component A and the masterbatch of component B evenly to obtain the mixed masterbatch; S4. The mixed masterbatch and carrier resin are mixed evenly, and then melt-extruded, cast, or blow-molded at 130~160℃ using a twin-screw extruder to obtain a mosquito-repellent tablecloth.

Images