KR100438020B1 - Preparation of Insect repel-lent fabric containing Permethrin - Google Patents

Abstract

The present invention relates to a method for producing a insect repellent fabric containing permethrin as an insect repellent component, the method for producing a insect repellent fabric according to the present invention is based on the total weight of (a) titanium dioxide having an average particle diameter of 0.2 ~ 0.3㎛ Adding 3.0 to 10% by weight to polymerize the raw polymer of the synthetic fiber; (b) manufacturing hollow synthetic fibers in which slits are formed in the longitudinal direction of the fibers by melt spinning the synthetic fiber raw material polymer; (c) impregnating the hollow synthetic fibers in a solution in which a vinyl chloride-vinylacetate copolymer is dissolved in a mixed solvent of methyl ethyl ketone and toluene, and then permethrin, dioctyl phthalate, zirconium wax composite, methyl cellulose and methylated melamine formaldehyde resin. Impregnating in a dispersion containing and sonicating under a frequency condition of 20-25 KHz; (d) weaving the fabric using the sonicated synthetic fibers; (e) dispersing a mixed powder of permethrin, zirconium wax composite, titanium dioxide and low density polyethylene (LDPE) on the surface of the woven fabric; and (f) above the softening point of low density polyethylene Heating step; characterized in that it comprises a. Insect repellent fabric prepared according to the manufacturing method of the present invention can not only impart a continuous insect repellent effect to the fabric by retaining the insect repellent component permethrin in the fabric for a long time, it is also excellent in washing resistance and touch.

Description

Preparation method of insect repellent fabric containing Permethrin {Preparation of Insect repel-lent fabric containing Permethrin}

The present invention relates to a method for producing a insect repellent fabric containing permethrin as an insect repellent component, and more particularly, to a method for producing a insect repellent fabric capable of retaining permethrin on the fabric for a long time.

Permethrins are synthetic pyrethroids that exhibit insecticidal properties with knockdown activity and insecticidal function against insects, as disclosed in US Pat. Nos. 5,198,287 and 5,631,072. Pyrethroids, including both natural compounds and synthetic homologues thereof, effectively control various pests such as mites, cockroaches, house flies, mosquitoes, black flies, fleas, and other flying or crawling insects. In addition, pyrethroids are harmless to plants, animals or humans and leave no harmful residues.

Despite these good properties, permethrin has a problem of short duration of insecticide. This is because permethrin decomposes into inert, non-pestifying substances when exposed to oxygen and ultraviolet light. The rate of degradation of permethrin is determined by the environment in which permethrin is present, but generally occurs within hours to days or weeks. Such instability of permethrin severely limits its effectiveness as an insecticide.

Thus, research has continued to sustain the pesticidal effect of permethrin.

For example, in order to improve the stability of pyrethroid against degradation, a method of adding an antioxidant and a light stable ultraviolet absorbing compound to the pyrethroid solution and encapsulating the pyrethroid have been proposed. However, the method of encapsulating pyrethroids is not effective because the rate of pyrethroid degradation in the capsule is as fast as that of unencapsulated pyrethroids. In addition, the addition of antioxidants and photostable UV absorbing compounds to the pyrethroid solution has a slight effect of reducing degradation due to degradation, but this method leaves most of the results invisible. Not only is it offset, but also durability, such as wash resistance, is bad.

In addition, several techniques have been proposed for the sustained release of pyrethroids. For example, US Pat. No. 4,765,982 to Ronning uses an insect control device comprising several rough surface cellulose fibers. The microencapsulated liquid pesticide adheres itself to the surface of the cellulose fiber, which is permeable to the capsule. Ronning's insecticide-treated coarse cellulose fibers have a variety of shapes that are relatively flat for proper use in specific locations such as webs, tapes, sheets and pads, such as ribbon-like tapes for attaching along a door or building base. It can be molded into. However, according to Ronning's patent, smooth surface fibers are not disclosed as suitable places for attachment of microencapsulated insect control agents. Therefore, it is not suitable to be applied to fabrics exposed to harsh external environments such as tents and light shielding films, or synthetic fiber fabrics mainly applied to fabrics such as camping and fishing clothes.

In addition, U. S. Patent No. 5,198, 287 discloses a fabric having a coating layer formed thereon to prevent decomposition of the permethrin together with the permethrin. However, such a fabric not only maintains the insect repellent effect of permethrin for a long time, but also has poor durability such as washing resistance by forming a coating layer on the outer surface of the fabric. In addition, the stiff hand is not suitable for clothing.

Therefore, the technical problem to be achieved by the present invention is to solve the above problems by leaving permethrin, the insect repellent component in the fabric for a long time, not only to impart a continuous insect repellent effect on the fabric, but also has excellent washing resistance and touch resistance The present invention provides a method for producing a dragon fabric.

1 is a perspective view showing a cross section of the hollow composite used in the fabric produced according to the manufacturing method of the present invention.

In order to achieve the above technical problem, (a) adding 3.0 to 10% by weight of titanium dioxide having an average particle diameter of 0.2 ~ 0.3㎛ based on the total weight to polymerize the raw material polymer of the synthetic fiber; (b) manufacturing hollow synthetic fibers in which slits are formed in the longitudinal direction of the fibers by melt spinning the synthetic fiber raw material polymer; (c) impregnating the hollow synthetic fibers in a solution in which a vinyl chloride-vinylacetate copolymer is dissolved in a mixed solvent of methyl ethyl ketone and toluene, and then permethrin, dioctyl phthalate, zirconium wax composite, methyl cellulose and methylated melamine formaldehyde resin. Impregnating in a dispersion containing and sonicating under a frequency condition of 20-25 KHz; (d) weaving the fabric using the sonicated synthetic fibers; (e) dispersing a mixed powder of permethrin, zirconium wax composite, titanium dioxide, and low density polyethylene (LDPE) on the surface of the woven fabric; and (f) above the softening point of low density polyethylene. It provides a method for producing a insect repellent fabric comprising a; heating step.

In the production method according to the present invention, as the raw material polymer of the synthetic fiber, high density polyethylene, polypropylene, nylon 6, nylon 66, polyester and the like can be used.

Hereinafter, the manufacturing method of the insect repellent fabric according to the present invention will be described in detail.

As mentioned above, permethrins are decomposed into inert materials by ultraviolet light and lose pesticide. In order to prevent this, in the production method of the present invention, first, by adding 3.0 to 10% by weight of titanium dioxide having an average particle diameter of 0.2 ~ 0.3㎛ based on the total weight to polymerize the raw material polymer of synthetic fibers. The sunscreen must efficiently scatter or absorb ultraviolet light in the ultraviolet range of 200-400 nm, especially 300-400 nm. Titanium dioxide has a different reflectance and absorption rate of ultraviolet rays depending on the size of the particles. Titanium dioxide, which is used as a color supplement for general fibers, has an average particle diameter of 0.3 to 0.5 µm. In this range, the visible light reflectance is large but the ultraviolet reflectance is not large. Reportedly, the region with the largest ultraviolet reflectance is 0.2-0.3 µm in average particle diameter, blocking 95% or more of ultraviolet rays in the 300-400 nm wavelength band. Therefore, in order to obtain a sufficient sunscreen effect, 3.0 to 10% by weight of titanium dioxide having an average particle diameter of 0.2 to 0.3 µm is added to the synthetic fiber polymerization of high density polyethylene, polypropylene, nylon 6, nylon 66 and polyester. Polymerization of the raw material polymer can prevent ultraviolet rays from blocking the permethrin and prevent titanium from being incorporated into the inside of the fiber rather than from the surface of the fiber, resulting in very good washing resistance and durability. Looking specifically at the manufacturing method of the raw material polymer made of polyester, for example, first, when diethylene terephthalate, ethylene glycol and manganese acetate is reacted to reach the mid-polymerization of the extreme viscosity of about 0.3, phosphoric acid and ethylene glycol Titanium dioxide slurry having the particle size as a solvent is added and stirred, and then, antimony oxide is added and the reaction is carried out under reduced pressure to obtain a polyester polymer having titanium dioxide mixed therein.

Subsequently, the synthetic fiber raw material polymer in which titanium dioxide is mixed is melted and spun to prepare synthetic fibers. Referring to FIG. 1, a through hole 11 is formed in the synthetic fiber 10, and a slit 12 is formed in a length direction of the fiber so that the through hole 11 is not disconnected from the outside. Such hollow synthetic fibers can be produced by spinning using known release spinnerets (see artificial fibers, mold publishing, etc.). Then, the hollow synthetic fiber was impregnated in a solution of a vinyl chloride-vinylacetate copolymer dissolved in a mixed solvent of methyl ethyl ketone and toluene, and then permethrin, dioctyl phthalate, zirconium wax composite, methyl cellulose and methylated melamine formaldehyde resin. Impregnated into a dispersion containing and treated with ultrasonic waves under a frequency condition of 20 ~ 25KHz. Vinyl chloride-vinylacetate copolymers and methylated melamine formaldehyde resins impart durability by allowing permethrin to adhere well to the fibers. Permethrin 13 introduced into the inner surface of the hollow fiber is imparted fluidity by the dioctyl phthalate and zirconium wax composite and exhibits a pesticidal effect for a long time by being continuously discharged through the slit formed in the longitudinal direction of the fiber. In the dispersion, methylcellulose acts as a thickener. If the dispersion is impregnated with hollow synthetic fibers and then ultrasonic waves are applied, overpressure and underpressure are generated in the dispersion, and permethrin is attached to the fibers well. In other words, if the negative pressure generated when applying ultrasonic waves to the dispersion is greater than the attractive force between liquid molecules, caption bubbles are generated in the solution. It bursts, and the state of high temperature and high pressure is maintained just before these bubbles burst. Due to the physical and chemical effects of the high energy state, permethrin is effectively attached to the fiber, thereby increasing durability. Specifically, after impregnating the hollow synthetic fibers in a bath containing a permethrin dispersion, 20 to 40% pulse at 20 to 30 ° C., an output of 350 to 450 W and a frequency of 20 to 25 KHz Performing for ~ 20 minutes can achieve the above object.

The synthetic fiber thus prepared contains permethrin, which is relatively firmly fixed to the hollow portion by adhesive resin and a crosslinking agent through an ultrasonic process, and the fixed permethrin is discharged little by little through the slit by dioctyl phthalate and zirconium wax composite. May have a pesticidal effect. In addition, the titanium dioxide incorporated in the synthetic fiber prevents the decomposition of the permethrin contained in the hollow portion sufficiently so that its function is not lost.

Subsequently, after weaving the fabric using the synthetic fiber prepared as described above, dropping the mixed powder of permethrin, zirconium wax composite, titanium dioxide and low density polyethylene (LDPE) onto the surface of the fabric using a hopper, and then using a blade or the like. Disperse homogeneously and heat above softening point of low density polyethylene. As a result, the polyethylene component is softened to fix the permethrin to the fabric surface, thereby imparting washing resistance and the like. At this time, the amount of the permethrin powder is added to the amount of permethrin contained in the above-described synthetic fiber, it is preferable to adjust the amount necessary to provide an initial concentration of approximately 1.25 / ㎡. In addition, the dosage of the low density polyethylene is preferably used to maintain the feel of the fabric to use a minimum amount enough to fix the mixed permethrin.

Hereinafter, the present invention will be described in detail with reference to Examples. However, embodiments according to the present invention may be modified in many different forms, and the scope of the present invention should not be construed as being limited to the embodiments described below. The embodiments of the present invention are provided to more completely explain the present invention to those skilled in the art.

Example

Preparation of Synthetic Fiber Raw Polymer

30 parts by weight of diethylene terephthalate, 17 parts by weight of ethylene glycol, and 0.094 parts of manganese acetate were added to add 0.045 parts by weight of phosphoric acid when the intrinsic viscosity was 0.3. Titanium dioxide having an average particle diameter of 0.28 µm using ethylene glycol as a solvent (2.97% by weight) Weight%) slurry was added and stirred, and then 0.01 part by weight of antimony oxide was added thereto, followed by a reduced pressure reaction to obtain a polyester polymer having a viscosity of 0.63.

Preparation of Hollow Synthetic Fiber

After melting the polyester polymer, it was stretched after spinning through a release spinneret to prepare a hollow synthetic fiber having a cross section of FIG.

Ultrasonic treatment

The hollow synthetic fibers were impregnated with the hollow synthetic fibers in a solution in which a vinyl chloride-vinylacetate copolymer was dissolved in a mixed solvent of methyl ethyl ketone and toluene. Then, 20 parts by weight of permethrin, 5.99 parts by weight of dioctyl phthalate, 1.51 parts by weight of zirconium wax complex, 1.79 parts by weight of methyl cellulose, 1.72 parts by weight of methylated melamine formaldehyde resin, 0.25 parts by weight of sodium salt of phosphorylated ester, and bromochlorinated hydrocarbon 27.66 After impregnating the hollow synthetic fibers in a bath containing a dispersion containing parts by weight, it was carried out for 10 minutes at a frequency of 20KHz and 30% pulse, 400W at 25 ℃.

Weaving and Permethrin Mixed Powder Treatment

The frequency treated hollow synthetic fiber was made to fabricate a light shielding film. Subsequently, 6 parts by weight of permethrin, 10 parts by weight of titanium dioxide and 100 parts by weight of low density polyethylene (LDPE) were dropped onto the surface of the fabric using a hopper, and then uniformly dispersed using a blade or the like and heated to 110 ° C. And cooled.

The fabric produced according to the above manufacturing method is not only continuously discharged permethrin for a long time in the inside of the hollow synthetic fiber and the outside of the fabric, but also prevents decomposition of the permethrin by blocking the ultraviolet rays by titanium dioxide, so that It is obvious that the insect repellent effect can be achieved.

As described above, the fabric produced according to the manufacturing method of the present invention can effectively prevent the decomposition of permethrin as well as the permethrin is continuously dissipated for a long time, the insect repellent effect is continuously maintained and the touch is also relatively excellent. Therefore, it can be usefully used as a fabric exposed to the harsh external environment such as a tent, a light shielding film, or a fabric such as a camping or fishing garment.

Claims (2)

(A) adding 3.0 to 10% by weight of titanium dioxide having an average particle diameter of 0.2 ~ 0.3㎛ based on the total weight to polymerize the raw material polymer of the synthetic fiber; (b) manufacturing hollow synthetic fibers in which slits are formed in the longitudinal direction of the fibers by melt spinning the synthetic fiber raw material polymer; (c) impregnating the hollow synthetic fibers in a solution in which a vinyl chloride-vinylacetate copolymer is dissolved in a mixed solvent of methyl ethyl ketone and toluene, and then permethrin, dioctyl phthalate, zirconium wax composite, methyl cellulose and methylated melamine formaldehyde resin. Impregnating in a dispersion containing and sonicating under a frequency condition of 20-25 KHz; (d) weaving the fabric using the sonicated synthetic fibers; (e) dispersing a mixed powder of permethrin, titanium dioxide and low density polyethylene (LDPE) on the surface of the woven fabric: and (f) heating the resultant of step (e) above the softening point of the low density polyethylene; a method for manufacturing a insect repellent fabric, characterized in that it comprises a. The method according to claim 1, wherein the raw material polymer of synthetic fiber is any one selected from the group consisting of high density polyethylene, polypropylene, nylon 6, nylon 66, and polyester.