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CN-121970747-A - Positive charge super-hydrophobic powder for preventing termites and preparation method and application thereof

CN121970747ACN 121970747 ACN121970747 ACN 121970747ACN-121970747-A

Abstract

The invention provides positively charged super-hydrophobic powder for preventing termites and a preparation method and application thereof, and belongs to the technical field of pesticide formulation processing. The positively charged super-hydrophobic powder takes super-hydrophobic silicon dioxide as a carrier, and the rest raw materials comprise medicaments and functional auxiliary agents. The preparation method comprises the steps of dissolving the medicament and the functional auxiliary agent in acetone, then spraying the mixture on the super-hydrophobic silica, uniformly stirring the mixture, and then crushing the mixture to obtain positively charged super-hydrophobic powder. The super-hydrophobic powder prepared by the invention can prolong the duration, reduce the times and the dosage of the medicine and reduce the pollution to water and soil. The positive charges generated by mutual friction among the powder particles and the negative charges of termite body walls are attracted mutually, so that the adhesive force and the distribution uniformity of the powder are improved. The powder has low toxicity and long toxic time after termite contacts, is favorable for termite to carry medicine back to the nest and realizes nest cleaning. The application method is simple and efficient, the targeting is strong, the toxicity to other organisms and human bodies is low, and the safety is high.

Inventors

  • ZHANG BIN

Assignees

  • 中国林业科学研究院木材工业研究所

Dates

Publication Date
20260505
Application Date
20260123

Claims (10)

  1. 1. The positively charged super-hydrophobic powder for controlling termites is characterized in that the positively charged super-hydrophobic powder takes super-hydrophobic silicon dioxide as a carrier, and the rest raw materials comprise medicaments and functional auxiliary agents.
  2. 2. The positively charged superhydrophobic powder for controlling termites according to claim 1, wherein the positively charged superhydrophobic powder comprises the following raw materials, by mass, 0.5-2.5% of a medicament, 0.1-0.5% of a functional auxiliary agent, and the balance superhydrophobic silica.
  3. 3. The positively charged superhydrophobic powder for controlling termites according to claim 2, wherein the superhydrophobic silica is prepared by: and mixing the fumed silica with ethanol, performing ultrasonic dispersion, stirring and refluxing, adding sodium hydroxide and dodecyl triethoxysilane for stirring reaction, and finally centrifuging, washing and drying to obtain the super-hydrophobic silica.
  4. 4. The positively charged superhydrophobic powder for termite control according to claim 3, wherein the mass ratio of fumed silica, sodium hydroxide and dodecyl triethoxysilane is 10:2.5:3; the addition amount ratio of the fumed silica to the ethanol is 10g to 250mL.
  5. 5. The positively charged superhydrophobic powder for controlling termites according to claim 3 wherein the ultrasonic power of the ultrasonic dispersion is 300-600W and the ultrasonic time is 10 min; The temperature of the stirring reflux is 70 ℃, the time is 3 min, and the rotating speed is 1000-1500 rpm; The stirring reaction is to perform magnetic stirring in a water bath at 70 ℃, the stirring speed is 1200rpm, and the time is 5 h; the rotational speed of the centrifugation is 12000 rpm, and the time is 5-8 min; The drying temperature is 45-60 ℃ and the drying time is 2-3 h.
  6. 6. The positively charged superhydrophobic powder for controlling termites according to claim 2 wherein the agent is one of chlorantraniliprole or ethiprole; The functional auxiliary agent is one of a quaternary ammonium salt surfactant or a double-ion surfactant.
  7. 7. A method of preparing the positively charged superhydrophobic powder for controlling termites according to any one of claims 1-6, comprising the steps of: and dissolving the medicament and the functional auxiliary agent in acetone, then spraying the mixture on the super-hydrophobic silica, uniformly stirring the mixture, and crushing the mixture to obtain the positively charged super-hydrophobic powder.
  8. 8. The method according to claim 7, wherein the stirring speed is 20-30 rpm and the stirring time is 10-15 min; the crushing is that the powder is crushed to be sieved by a 200-mesh sieve.
  9. 9. Use of a positively charged superhydrophobic powder according to any of claims 1-6 for controlling termites in a termite control process.
  10. 10. The application according to claim 9, wherein the application is performed by spraying the positively charged superhydrophobic powder onto termites; the spraying amount is 15-30 g per nest.

Description

Positive charge super-hydrophobic powder for preventing termites and preparation method and application thereof Technical Field The invention belongs to the technical field of pesticide formulation processing, and particularly relates to positively charged super-hydrophobic powder for controlling termites, and a preparation method and application thereof. Background Termites are very characteristic social insects, mainly eat substances containing cellulose such as wood and the like, and can degrade cellulose which is the most main component in digested wood. This life habit of termites is of great ecological importance in accelerating the matter circulation of wood and other plant materials on earth. Termite resources are abundant in tropical and subtropical areas, and they can aid in about 1/3 of the deadwood impurities to decompose and circulate substances each year. They become pests when they eat wood elements of house construction, building materials, greening trees and other commercial products, or nest on buildings, hydraulic dams. The active ingredients of the termite control agent in the prior art are bifenthrin, imidacloprid, fipronil, chlorpyrifos and the like, and the main dosage forms are emulsifiable concentrate, suspending agent and powder. The medicines have the advantages of high toxicity to the termites, good killing effect and long lasting period of part of medicines, and have the defects of high toxicity and too fast poisoning attack, and are not beneficial to bringing medicines back to nest for feeding termite king, post-termite and young nymphs by the workers, thereby achieving the aim of clearing nests. The toxicity of the medicament is high, and the medicament has risks for environmental organisms such as fishes, shrimps, bees, earthworms, bees and the like, and has certain potential safety hazard for drug administration personnel. Meanwhile, the traditional termite powder is mainly made of inorganic matters such as kaolin, diatomite, talcum powder and the like or organic matters such as starch, cellulose powder and the like as fillers, has the advantages of low cost and easy obtainment of materials, and has the defects that the traditional termite powder is easy to wet and agglomerate to lose use value, moreover, termites live underground or in a moist environment, the traditional termite powder is quickly mixed with moist soil to lose the capability of adhering to termites after being sprayed, and the termite powder needs to be repeatedly applied, so that unnecessary waste and pollution are caused. The upper epidermis of insects such as termites is mainly composed of chitin and protein, and is covered with a thin wax layer to prevent evaporation of water. Chitin is a natural high molecular polysaccharide with negatively charged groups (e.g., acetamido and hydroxyl groups) in its molecular structure, and the charge of proteins depends on their amino acid composition and environmental pH, but many proteins also tend to be negatively charged under near neutral conditions. Thus, the surface of the termite body wall itself is biased to be negatively charged. If the powder carries positive charges, the adhesion of termite body wall to the powder can be greatly increased, and the drug effect is improved. The traditional powder carrier is replaced by an innovative super-hydrophobic material, and the powder is provided with positive charges through functional auxiliary agents, so that the problems can be well solved. The method for preparing the powder with positive charges by taking the super-hydrophobic silicon dioxide as a powder carrier has not been reported. Therefore, research on super-hydrophobic silicon dioxide as a powder carrier and matching with a medicament with low toxicity and small environmental risk and a termite control medicament prepared by combining a positive charge functionalized additive are technical problems to be solved urgently by those skilled in the art. Disclosure of Invention In order to solve the problems in the prior art, the invention provides positively charged super-hydrophobic powder for preventing termites, and a preparation method and application thereof. The main component of the super-hydrophobic powder is super-hydrophobic silicon dioxide, which has the characteristics of extremely loose texture, strong adsorption capacity, extremely difficult wetting and the like, and the super-hydrophobic powder is positively charged by adding functional auxiliary agents so as to realize the effect of preventing termites. In order to achieve the above purpose, the present invention provides the following technical solutions: one of the technical schemes of the invention is as follows: The invention provides positively charged super-hydrophobic powder for preventing termites, which takes super-hydrophobic silicon dioxide as a carrier, and the rest raw materials comprise medicaments and functional auxiliary agents. Further, the positively charged super-hydrophobic p