Textile fabric for insecticidal nets with improved surface activity using two active ingredients

Abstract

The present invention relates to a textile fabric for use in insecticidal bed nets, which fabric uses at least two active ingredients and enhances the utilization of the insecticide reservoir, thus increasing the surface activity. The fabric is woven from at least two monofilaments (MF1 and MF2), wherein the two active ingredients (AI1 and AI2) are embedded in the monofilaments in different mixing ratios. The monofilaments can be manufactured by means of a single-component technology or a double-component technology using a core-sheath extrusion design. If manufactured by means of a single-component technology, all AIs are distributed uniformly within the volume of the monofilament. If manufactured by means of a double-component technology, the AIs, and finally, the synergist (SYN) and the migration inhibitor (MI) can be preferentially positioned within the volume of the monofilament. The preferential positioning of the AIs, SYN and MI enables an increase in the biological activity of the product against insects over the period of validity.

Description

Invention Overview This invention relates to an insecticidal fabric made of two cylindrical monofilaments (named MF1 and MF2) warp-knitted together, containing at least two active ingredients (named AI1 and AI2), wherein the active ingredients are embedded in the two monofilaments in different mixing ratios, such as... Figure 1 As shown.

[0002] The insecticidal fabric of this invention is warp-knitted from two types of cylindrical monofilaments and contains at least two active ingredients, wherein the diameters of the two monofilaments can be different, such as... Figure 2 As shown, the diameter of one type of monofilament is 25%-75% larger than that of the other type of monofilament.

[0003] The present invention also relates to an insecticidal fabric made of two cylindrical monofilaments warp-knitted together, having at least two active ingredients, wherein at least one of the monofilaments also incorporates a synergist (named SYN in the specification) as a chemical entity, with the aim of enhancing the activity of the incorporated active ingredients (AI1 and AI2).

[0004] This invention also relates to a method for preparing an insecticidal fabric, which is warp-knitted from two cylindrical monofilaments and contains at least two active ingredients and synergist chemical entities. The method includes warp knitting from two monofilaments (MF1 and MF2), wherein the two active ingredients (AI1 and AI2) are embedded in the two monofilaments in different mixing ratios. The first monofilament, named MF1, is manufactured using a single-component technology, while the second monofilament, named MF2, is manufactured using a two-component (Bi-Co) technology with a core-to-sheath volume ratio of 70%-95% and a core-to-sheath design of 5-30% v / v. The active ingredient (AI) in MF1 is uniformly distributed within the volume of the monofilament, while the active ingredient in MF2 is mainly concentrated in the sheath layer. Figure 3 ), while synergists and / or migration inhibitors are mainly used in the core layer.

[0005] The warp-knitted insecticidal fabric of the present invention is used to manufacture ITN or LLIN, and has the advantages of enhanced insecticidal activity, longer duration of activity, and improved human safety. Attached Figure Description

[0006] Figure 1 Example diagrams of monofilaments (MFI) and monofilaments (MF2) showing the distribution texture of the active ingredient (AI) and synergist (SYN).

[0007] Figure 2 Example diagrams showing monofilaments (MFI) and monofilaments (MF2) of different diameters are shown.

[0008] Figure 3Example diagrams of monofilaments (MFI) and (MF2) are shown, illustrating monofilaments extruded using a bicomponent technology, exhibiting clear core and sheath textures and containing AI, SYN, etc.

[0009] Figure 4 Example diagrams of monofilaments (MFI) and monofilaments (MF2) obtained by extruding two types of monofilaments of the same diameter using a two-component technology.

[0010] Figure 5 Example cross-sectional views of monofilaments (MFI) and (MF2) obtained through a two-component technique and a core-sheath design.

[0011] Figure 6 This is an example diagram of the loop-forming process for manufacturing two-dimensional mosquito net fabrics using two types of monofilaments through warp knitting.

[0012] Figure 7 This is an exemplary illustrated process for extruding bicomponent monofilaments.

[0013] Figure 8 Example diagram of the cross-section of a cylindrical bicomponent monofilament with different core / sheath surface ratios.

[0014] Figure 9 This is an example diagram showing the main setup of a bicomponent monofilament extruder.

[0015] Figure 10 Example graph showing the wash resistance index (WRI) of monofilaments incorporating double AI and containing SMI and FMI of the same thickness.

[0016] Figure 11 Example diagram of wash resistance index (WRI) for monofilaments containing SMI and FMI with double AI of different thicknesses (GB1 thickness is 100 denier, GB2 thickness is 200 denier, the ratio of the two is 80:20).

[0017] Figure 12 Example diagram of the wash resistance index (WRI) of monofilaments with the same thickness, incorporating both SMI and FMI, using a two-component core / sheath design and incorporating dual AI. Invention Details The following discusses some representative embodiments of the present invention. The invention is not limited in its broader aspects to the specific details and representative methods. Exemplary examples will be described in conjunction with the provided embodiments and methods.

[0019] It is important to note that, unless the context clearly specifies otherwise, the singular forms “a,” “an,” and “the” used in the specification all include plural references. Therefore, for example, a reference to a composition containing “one compound or component” includes a mixture of two or more compounds or components. It should also be noted that, unless the context clearly specifies otherwise, the term “or” is generally used in a way that includes “and / or”.

[0020] Unless otherwise stated, all quantities expressed in “%” or “% w / w” refer to the total weight percentage of the solution or composition.

[0021] Abbreviations used in this patent specification and their explanations: LUN Long-lasting Insecticide Net ITN netting treated with pesticides HDPE (High Density Polyethylene) LLDPE (linear low-density polyethylene) LDPE (Low-density polyethylene) PET, polyethylene terephthalate, commonly known as "polyester". MF monofilament SYN synergist AI active ingredients or pesticides Bi-Co two-component or two-component PBO piperyl butyl ether, a specific type of synergist SMI slow-migration insecticide FMI (Fast Migration Insecticide) Mono-Co (single-component or single-component) MI migration inhibitors To elucidate our invention of an improved surfactant fabric for insecticidal mosquito nets using two or more active ingredients, a uniquely designed bicomponent (BiCo) technology was developed, making the fabric economically viable and easy to scale up for commercial manufacturing.

[0022] Embodiments of the present invention provide a two-dimensional textile fabric produced by warp knitting of two cylindrical monofilaments (named MF). An insecticide (also known as the active ingredient, AI) is embedded in the high-density polyethylene (HDPE) polymer matrix of the monofilaments.

[0023] The volume of the HDPE monofilament matrix acts as a reservoir for insecticides and synergists, which migrate to the surface of the monofilament to make them biologically usable for mosquitoes.

[0024] Both monofilaments are made of HDPE, sometimes mixed with small amounts of LDPE or LLDPE, but containing different pesticide formulations. As described in the background section of this patent specification, Vestergaard's patent EP2170048B1 in the prior art describes the interweaving of different yarns, each containing a different pesticide. However, it must be emphasized that the present invention differs from this prior art in that it uses monofilaments that are not interwoven, but rather woven together into a textile fabric using a looping process through specific movements of two needle bars. Furthermore, compared to Vestergaard et al.'s patent EP3056084B1, the present invention has another significant difference: all pesticides are present in both yarns (…). Figure 1 ).

[0025] The 2014 disclosure by Katiyar et al., entitled "Development of insecticide-incorporated-knitted-fabric having long-lasting efficiency using Bi-Co spinning technology for ITN," is neither applicable to large-scale manufacturing nor makes the process feasible and practical. This disclosure involves a combination of a PET core and an HDPE sheath, which is substantially different from the present invention. Furthermore, this disclosure uses only one insecticide incorporated into two identical yarns, which is substantially different from the embodiments of the present invention.

[0026] In another embodiment of the invention, different pesticides and bio-enhancing agents are used, which migrate at different rates in the monofilaments manufactured from HDPE.

[0027] In one specific embodiment, the liquid synergist used is piperonyl butyl ether (PBO), which migrates much faster than pyrethroid insecticides alone, which migrate very slowly. After approximately three years of use in the field, mosquito net monofilaments typically lose all PBO content, but the core still contains pyrethroids.

[0028] Examples of synergists used in this invention include, but are not limited to, piperonyl butyl ether (PBO), sebacic acid esters, fatty acids, fatty acid esters, vegetable oils, esters of vegetable oils, alcohol alkoxylates, and antioxidants.

[0029] In another embodiment of the invention, two monofilament design features are employed to ensure a better balance between different migration speeds, thereby optimizing the utilization of pesticide and / or synergist reservoirs in the monofilaments.

[0030] The first design feature is the use of two cylindrical monofilaments with two different diameters, so that the two monofilaments each have a different volume / surface area ratio. Figure 2 ).

[0031] Slow-migration insecticides (SMIs) will be primarily found in smaller diameter monofilaments. Fast-migration synergists and / or insecticides (FMIs) will be primarily found in larger diameter monofilaments.

[0032] In a specific embodiment of the present invention, MF1 is provided with a diameter of approximately 135 micrometers, but within the limits and scope of the present invention, it can also be between 100 and 140 micrometers. The diameter of MF2 is generally maintained at around 160 micrometers, but can also be between 135 and 175 micrometers. However, the diameter of MF2 is always 25% to 75% larger than the diameter of MF1.

[0033] In a preferred embodiment of the invention, two monofilaments with different insecticide and synergist formulations and different diameters are warp-knitted together in an asymmetrical threading manner.

[0034] In this invention, the preferred weaving method is four-lapping, which includes approximately 80% MF1 yarn length and 20% MF2 yarn length on the fabric surface.

[0035] In another embodiment of the invention, a second design feature is that at least one of the two monofilaments is manufactured using a two-component extrusion technique. The two components contained in the monofilament—each an insecticide and / or synergist formulation—are bonded together by an extrusion process.

[0036] In a preferred embodiment, a circular core layer is encased in a sheath of uniform thickness. In a preferred embodiment, the core / sheath volume / diameter ratio is between 70%:30% and 95%:5%. Both the core and sheath layers are carried by polyethylene polymer resin carriers.

[0037] The two different monofilaments are named MF1 and MF2 throughout the text.

[0038] In another specific embodiment of the invention, MF1 primarily, but not entirely, comprises a non-pyrethroid insecticide (AI1). If MF1 is manufactured using a single-component technology, the predominant insecticide is uniformly distributed throughout the volume of the monofilament.

[0039] If the monofilament is manufactured using a two-component technology, the insecticide is primarily, but not entirely, present in the sheath of the monofilament. In this invention, "primarily" means more than 90%.

[0040] MF2 primarily, but not entirely, contains pyrethroid or non-pyrethroid insecticides (AI2). If pyrethroid insecticides are used, the invention may also include PBO as a synergist.

[0041] According to the present invention, the insecticidal fabric contains an incorporation of a non-pyrethroid insecticide selected from chlorfenapyr, indoxacarb, fenpyroximate, emamectin benzoate, tolfenpyrad, metaflumyzone, cyazofamid, or mixtures thereof.

[0042] Pyrethroid insecticides can be selected from α-cypermethrin, deltamethrin, bifenthrin, lambda cyhalothrin, permethrin, ethfenprox, or mixtures thereof; however, they may also contain some other advanced pyrethroid insecticides.

[0043] The total content of non-pyrethroid and pyrethroid insecticides in the core and sheath ranged from 0.2% to 3.0% w / w.

[0044] If MF2 is manufactured using a single-component technology, the main insecticides are evenly distributed throughout the volume of the monofilament.

[0045] If this monofilament is manufactured using a two-component technology, the main insecticide is mainly, but not entirely, present in the sheath of the monofilament, while the synergist is mainly, but not entirely, present in the core layer.

[0046] The migration mechanism of AI and other functional additives in polymers mainly follows the concentration gradient. Therefore, AI will migrate from the sheath layer in which the filament has a high concentration to the core layer in which the filament has a low concentration or no concentration, thereby reducing the effectiveness of AI on the filament surface.

[0047] To prevent the effects of AI migration to the core layer, the same mechanisms established to prevent dye migration within the polymer can be employed. Hariri and Ruch investigated conventional techniques in the polymer industry that use block copolymers to mitigate dye migration within the polymer. https: / / www.researchgate.net / publication / 272537695 Block copolymers as dispersants and migration inhibitors Incorporation of fluorescence dyes in polymer This invention uses up to 10% polyolefin block copolymers, for example, Dow's trademarked product, Dow Infuse 9010, can be incorporated into the core layer of the yarn.

[0048] The disclosure of this application provides for each implementation method and combination thereof disclosed herein.

[0049] The following are exemplary embodiments of the best mode with reference to the accompanying drawings; however, they should not be construed as limiting the scope of the invention.

[0050] The process of incorporating dual AI into monofilaments: The doping process of dual AI includes the following steps.

[0051] In the first step, polyethylene (LLDPE), used as the polymer carrier resin, is mixed with bifenthrin (SMI) and fenpropathrin (FMI) in a drum mixer to form a homogeneous mixture. This material composition is then fed in solid form into the feed zone of a twin-screw compounding extruder to produce a concentrated masterbatch of the active ingredients. This produced masterbatch is used in subsequent steps.

[0052] In the second step, the concentrated masterbatch is diluted into high-density polyethylene (HDPE) to produce monofilaments MF1 and MF2, which contain 7 g / kg technical grade bifenthrin and 8 g / kg technical grade bromonitrile.

[0053] Take 10% by weight of the masterbatch prepared above and mix it with about 90% by weight of high-density polyethylene (HDPE) in a suitable mixer or drum mixer, and then extrude the mixture using a single screw monofilament extruder.

[0054] Polyethylene is fed from the feed zone to the extruder in granular form, and the active ingredient is added to the polymer melt in the form of concentrated masterbatch in the required amount.

[0055] The polymer material of the present invention is used to manufacture insecticide-infused monofilament yarns with a linear density of about 120 denier.

[0056] The polymer material is melted in a single-screw extruder with a temperature controlled at 220±5℃ and extruded through a suitable monofilament die.

[0057] Incorporation process of dual AI in bicomponent fibers: In the first step, two separate masterbatches are manufactured. Both masterbatches use polyethylene (LLDPE) as the polymer carrier resin.

[0058] The carrier resin was mixed separately with bifenthrin (for preparing the first masterbatch) and bromonitrile (for preparing the second masterbatch) in a drum mixer to form a homogeneous mixture. This material composition was then fed in solid form into the feed zone of a twin-screw compounding extruder to produce a concentrated masterbatch of the active ingredients. These produced masterbatches will be used in subsequent processes.

[0059] In the second step, a bicomponent monofilament extruder was used. This extruder has two independent single-screw extruders capable of processing polymer blends of different pesticide formulations and concentrations in parallel. These polymer blends are then combined into bicomponent monofilaments in suitable bicomponent extrusion dies. The bicomponent extruder used is designed to deliver an 80 / 20 core-to-sheath ratio, meaning that 80% of the polymer blend forms a cylindrical core, and 20% forms a sheath layer enveloping the core. To manufacture monofilaments with the delayed-release, fast-migrating (FMI) brofennig, a higher concentration of brofennig-containing masterbatch was added to the extruder processing the core, while a higher concentration of a slow-migrating (SMI) masterbatch was added to the extruder processing the sheath layer.

[0060] Calculate the letdown ratio of the masterbatch in the two polymer streams to achieve the same total concentration of 7 g / kg bifenthrin and 8 g / kg chlorfenapyr as in monofilament production using the single-component technology.

[0061] Figure 1-12 The invention is illustrated in detail with filaments manufactured using single-component and two-component technologies to best explain the working principle of the invention.

[0062] Figure 01 shows cross-sections of two cylindrical monofilaments (MF1 and MF2) with the same diameter. Both monofilaments are manufactured using a single-component technology. Each monofilament contains two different active ingredients (AI1 and AI2) in different mixing ratios, and ultimately contains a synergist (SYN). The active ingredients and synergist migrate to the surface of the silk and can be ingested by insects or mosquitoes.

[0063] Figure 02 shows cross-sections of two cylindrical monofilaments (MF1 and MF2) with different diameters. Both monofilaments are manufactured using a single-component technology. Both monofilaments contain two different active ingredients (AI1 and AI2) in different mixing ratios, and ultimately contain a synergist (SYN). The active ingredients and synergist migrate to the surface of the filament and can be ingested by insects / mosquitoes. The active ingredients and synergist with rapid migration effects (in this example, AI2 and SYN) will be primarily located in the larger diameter monofilament.

[0064] Figure 03 shows cross-sections of two cylindrical monofilaments (MF1 and MF2) with different diameters. The smaller diameter monofilament is manufactured using a single-component technology, while the other monofilament is manufactured using a two-component technology (or Bi-Co technology). The two-component monofilament is manufactured using a core-sheath design. Both monofilaments contain two different active ingredients (AI1 and AI2) in different mixing ratios and ultimately contain a synergist (SYN) and a migration inhibitor (MI). The active ingredients and synergist migrate to the surface of the silk and can be ingested by insects / mosquitoes. The rapidly migrating synergist and supplementary active ingredients (SYN and AI2 in this example) will be primarily located in the two-component monofilament. In this two-component filament, the rapidly migrating synergist will be primarily located in the core layer, while the slower-migrating active ingredient will be primarily located in the sheath layer. The two-component monofilament ultimately contains an additional migration inhibitor (MI) compound, which is primarily located in the core layer.

[0065] Figure 04 shows cross-sections of two cylindrical monofilaments (MF1 and MF2) of the same diameter. Both monofilaments are manufactured using a bicomponent core-sheath design. Both monofilaments contain two different active ingredients (AI1 and AI2) in different mixing ratios, and ultimately include a synergist (SYN) and a migration inhibitor (MI). The active ingredients and synergist migrate to the surface of the silk and can be ingested by mosquitoes. In monofilament 1 (MF1), the predominantly available active ingredient (AI1) is located primarily in the sheath layer. In monofilament 2 (MF2), the rapidly migrating synergist will be located primarily in the core layer, while the supplementary active ingredient (AI2) will be located in the sheath layer. The bicomponent monofilament ultimately includes an additional migration inhibitor (MI), which is located primarily in the core layer.

[0066] Figure 05 shows cross-sections of two cylindrical monofilaments (MF1 and MF2) with different diameters. Both monofilaments are manufactured using a bicomponent core-sheath design. Both monofilaments contain two different active ingredients (AI1 and AI2) in different mixing ratios, and ultimately include a synergist (SYN) and a migration inhibitor (MI). The active ingredients and synergist migrate to the surface of the silk and can be ingested by mosquitoes. In monofilament 1, the predominantly available active ingredient (AI1) is mainly located in the sheath layer of the silk. In monofilament 2 (the larger diameter filament), the rapidly migrating synergist will be mainly located in the core layer of the silk, while the supplementary active ingredient (AI2) will be located in the sheath layer. The bicomponent monofilament ultimately contains an additional migration inhibitor (MI), which is mainly located in the core layer.

[0067] Figure 06 illustrates the loop-forming process of warp knitting two types of monofilaments to form a two-dimensional mosquito net fabric.

[0068] Figure 07 illustrates the extrusion process for bicomponent monofilaments—the extrusion process. Two independent extruders (extruder A for the core layer and extruder B for the sheath layer) melt and process two separate polymer streams. Within each extruder, the polymer streams are mixed with different combinations of AI, SYN, and MI. As the polymer streams enter the extrusion die, the polymer stream for the sheath layer forms a thin melt pool, while the polymer stream for the core layer is extruded through a cylindrical orifice and injected into the melt pool for the sheath layer. Thus, the cylindrical core stream carries the sheath stream into the next orifice, forming a cylindrical monofilament with the polymer from the core stream at its center and the sheath stream on the surface. By adjusting the processing speeds of extruders A and B, the thicknesses of the core and sheath layers can be adjusted, resulting in core / sheath designs with different cross-sectional surface area ratios.

[0069] Figure 08 shows examples of cross-sections of cylindrical bicomponent monofilaments with different core / sheath surface area ratios. Examples established: core approximately 90% / sheath approximately 10% and core approximately 70% / sheath approximately 30%.

[0070] Figure 09 illustrates the main setup of a bicomponent (Bi-Co) monofilament extruder, using extruders A and B in parallel. Both extruders melt and mix HDPE granules, AI (AI1 and AI2), and ultimately SYN and MI, appropriately added inside the machine. The polymer compound is then pressed into the extrusion die. Inside the die, the polymer melt of the sheath layer forms a melt pool, and the polymer of the core layer is injected through the melt pool, carrying the melt of the sheath layer out of the nozzle. This forms a filament with a core-sheath design. This demonstrates an economically viable machine for extruding bicomponent fibers containing at least two active ingredients to produce fabrics, which can then be converted into high-quality and safe insecticide-treated mosquito nets (ITN).

[0071] Figure 10 The washability index (WRI) curves of mosquito nets incorporating insecticides are shown. All yarns manufactured using a single-component technology had the same thickness (120 denier) and contained the same composition of two different insecticides: bifenthrin (BIF or SMI) and chlorfenapyr (CFP or FMI). The initial dosage (W0) at 0 washes was approximately 7 g / kg BIF and 8 g / kg CFP, with a concentration of 35 g / m². 2 At the fabric weight, the initial AI content is 245 mg / m². 2 BIF and 280 mg / m 2 CFP levels were significantly lower in the silk after 20 washes (W20) than residual BIF levels. CFP is considered a fast-migrating insecticide (FMI), while BIF is considered a slow-migrating insecticide (SMI).

[0072] Figure 11 The wash resistance index (WRI) curve of a mosquito net incorporating insecticides is shown. This mosquito net contains two insecticides and uses yarns manufactured using a single-component technology, with an optimized volume surface area ratio to accommodate the different migration characteristics of FMI and SMI. 80% of the yarns constituting the surface of the mosquito net fabric are from GB1 with a thickness of 100 denier, while 20% are from GB2 with a thickness of 200 denier. Therefore, the average thickness is 120 denier, and the fabric weight is 35 g / m². 2 Initial pesticide content and Figure 10 The same as in the middle, which is 245 mg / m 2 BIF and 280 mg / m 2 CFP. However, the concentrations of BIF and CFP were adjusted based on the migration ability of different insecticides: GB1: Linear contribution rate 80%, 100D BIF: 9g / kg CFP: 6g / kg GB2: Linear contribution rate 20%, 200D BIF: 3g / kg CFP: 12g / kg As can be seen from the graph, after 20 washes, compared to Figure 10 Compared to the CFP residue in the original product, the embedding of this optimized AI in the filament results in a higher CFP residue, which in turn leads to extended product life or potential cost savings.

[0073] Figure 12 A graph showing the Washability Index (WRI) of mosquito nets incorporating insecticides is displayed. All yarns are manufactured using a two-component technology with an 80% / 20% core / sheath design and have the same thickness (120 denier). The fabric weight is 35 g / m². 2 The average initial AI concentrations of the two different insecticides, bifenthrin (BIF) and chlorfenapyr (CFP), at W0 were approximately 7 g / kg for BIF and 8 g / kg for CFP. This was at a fabric weight of 35 g / m². 2 At that time, the initial AI content was 245 mg / m³. 2 BIF and 280mg / m 2 CFP, and Figure 10 and Figure 11 same.

[0074] After 20 washes (W20), the residual CFP (or FMI) in the filament was higher than the residual BIF (SMI). The WRI curves for the two AIs were almost parallel. This phenomenon was observed because CFP (FMI) is mainly, but not entirely, located in the core layer of the filament, which leads to a release delay due to the longer average travel distance to the filament surface. In contrast, BIF (SMI) is mainly, but not entirely, located in the sheath layer of the filament, and has a shorter travel distance to the filament surface.

[0075] This invention brings the WIR values ​​of two AIs with different migration characteristics closer together, thereby saving costs and / or improving performance and / or significantly improving product lifespan.

[0076] The above exemplary illustrations are intended to illustrate the advantages and working principle of the present invention; however, they should not be construed as limiting the invention. Temperature is in degrees Celsius; the mixing ratio of substances is in grams.

Claims

1. An insecticidal fabric woven from two cylindrical monofilaments (named MF1 and MF2), containing at least two active ingredients (named AI1 and AI2), wherein the active ingredients are embedded in the two monofilaments in different mixing ratios (Figure 1), optionally containing a synergist (SYN).

2. The insecticidal fabric according to claim 1, wherein the two monofilaments have different diameters (Figure 2).

3. The insecticidal fabric according to claim 2, wherein the diameter of one monofilament is 25%-75% larger than the diameter of the other monofilament.

4. An insecticidal fabric woven from two cylindrical monofilaments (named MF1 and MF2), containing at least two active ingredients (named AI1 and AI2), wherein the active ingredients are embedded in the two monofilaments in different mixing ratios (Figure 1), and containing a synergist (SYN) embedded in at least one monofilament (Figure 1).

5. An insecticidal fabric woven from two monofilaments (MF1 and MF2), wherein two active ingredients (AI1 and AI2) are embedded in the two monofilaments in different mixing ratios, and MF1 is manufactured by a single-component technology, while MF2 is manufactured using a core-sheath design with a two-component technology. The active ingredients in MF1 are uniformly distributed within the volume of the monofilament, while the active ingredients in MF2 are mainly, but not entirely, concentrated in the sheath layer (Figure 3), while the synergists and / or migration inhibitors are mainly, but not entirely, used in the core layer.

6. The insecticidal fabric according to claim 5, wherein the core:sheath volume ratio of the bicomponent monofilament is 70%-95% and 5%-30% v / v.

7. The insecticidal fabric according to claim 5, wherein the two monofilaments are bicomponent monofilaments with a core-sheath design (Figure 4), the two active ingredients (AI1 and AI2) are embedded in the two monofilaments in different mixing ratios, and AI1 is predominantly, but not entirely, concentrated in the sheath of MF1, while AI2 is predominantly, but not entirely, concentrated in the sheath of monofilament MF2, wherein if the active ingredient AI2 is a pyrethroid, MF2 optionally contains a synergist (SYN) and / or a migration inhibitor (MI), which are predominantly, but not entirely, concentrated in the core of MF2.

8. The insecticidal fabric according to claim 7, wherein the synergist and migration inhibitor are located in a bicomponent monofilament and are completely embedded in the core layer of the monofilament.

9. The insecticidal fabric according to claim 5, wherein MF1 accounts for 50%-90% of the length of the monofilaments on the fabric surface, and MF2 accounts for 10%-50% of the length of the monofilaments on the fabric surface.

10. The insecticidal fabric according to claim 1, wherein AI1 is a non-pyrethroid insecticide, and AI2 is a pyrethroid or non-pyrethroid insecticide.

11. The insecticidal fabric according to claim 10, wherein the non-pyrethroid insecticide is selected from chlorfenapyr, indoxacarb, abamectin benzoate, acetamiprid, cyfluthrin, spinosad, cyazofamid, or mixtures thereof.

12. The insecticidal fabric according to claim 10, wherein the total content of non-pyrethroid insecticides in the core layer and sheath layer is 0.2%-3.0% w / w.

13. The insecticidal fabric according to claim 10, wherein the pyrethroid insecticide is α-cypermethrin, deltamethrin, bifenthrin, lambda-cyhalothrin, permethrin, ethoxysulfuron, or a mixture thereof.

14. The insecticidal fabric according to claim 13, wherein the total content of pyrethroid insecticides in the core layer and sheath layer is 0.2%-3.0%.

15. The insecticidal fabric according to claim 4, wherein the synergist is PBO, and the synergist content in the core and sheath is 0.2%-3% w / w.

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