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CN-121420970-B - Thickening suspending agent containing modified attapulgite and application thereof

CN121420970BCN 121420970 BCN121420970 BCN 121420970BCN-121420970-B

Abstract

The invention discloses a thickening suspending agent containing modified attapulgite and application thereof, which belong to the technical field of thickening suspending agents, wherein the impurity content of the surface of the attapulgite is reduced after acidification treatment, the surface area and the porous property are increased, the loading rate of zero-valent iron can be improved, the zero-valent iron is uniformly loaded on tubular channels or surfaces of the attapulgite by nano particles, the surface roughness of composite powder is increased, stronger steric hindrance can be formed around pesticide particles, the pesticide particles are prevented from being aggregated and enlarged due to collision, so that sedimentation is reduced, the thickening suspending agent has good suspension property and dispersibility, the loading of the zero-valent iron can endow the thickening suspending agent with the capability of chelating heavy metals, the modified zero-valent iron composite attapulgite powder can be uniformly loaded between graphene oxide layers through twice intercalation treatment, the graphene oxide can assist in dispersing the attapulgite to avoid agglomeration, and the existence of the graphene oxide can increase the thermal stability of the thickening suspending agent.

Inventors

  • LI ZHENGUO

Assignees

  • 明光市国星凹土有限公司

Dates

Publication Date
20260508
Application Date
20251029

Claims (6)

  1. 1. The thickening suspending agent containing the modified attapulgite is characterized by being prepared by the following steps: Firstly, reducing iron ions on the surface of acidified attapulgite powder by using a liquid phase reduction method and taking the acidified attapulgite powder as a carrier, thereby obtaining zero-valent iron composite attapulgite powder; treating the zero-valent iron composite attapulgite powder by gamma-aminopropyl triethoxysilane to obtain modified zero-valent iron composite attapulgite powder; Intercalation is carried out on graphene oxide by utilizing sodium dodecyl sulfate, and then the obtained graphene oxide sheet is compounded with modified zero-valent iron compound attapulgite powder through electrostatic assembly action to obtain modified attapulgite compound powder; Step four, taking flumetralin, modified attapulgite composite powder, diisooctyl succinate sodium sulfonate, an organosilicon defoamer, a polyethylene glycol antifreeze, xanthan gum and deionized water as raw materials, and shearing at high speed, grinding and refining to obtain a thickening suspending agent containing modified attapulgite; the preparation method of the zero-valent iron composite attapulgite powder comprises the following specific steps: Adding ferric sulfate heptahydrate, acidified attapulgite powder and deionized water into a reaction kettle, stirring for 40-50min at 20-25 ℃ and 500-600r/min, continuously stirring for 2-3h under nitrogen atmosphere, then adding absolute ethyl alcohol, continuously stirring for 30-40min, then adding sodium borohydride solution with the concentration of 1mol/L, continuously stirring for 30-40min, centrifuging for 5-6min at 5000-6000r/min, washing the product with ionized water and absolute ethyl alcohol for 2-4 times respectively, and vacuum drying for 1-2h at 60-80 ℃ to obtain zero-valent iron composite attapulgite powder; The preparation method of the modified zero-valent iron composite attapulgite powder comprises the following specific steps: Adding ethanol, zero-valent iron composite attapulgite powder and gamma-aminopropyl triethoxysilane into a reaction kettle, stirring for 40-50min at 20-25 ℃ and 500-600r/min, heating to 80-90 ℃, continuously stirring for 3-4h, filtering, collecting precipitate, washing the precipitate with deionized water and absolute ethanol for 2-4 times respectively, and vacuum drying at 60-80 ℃ for 1-2h to obtain modified zero-valent iron composite attapulgite powder; The specific preparation steps of the modified attapulgite composite powder are as follows: Adding graphene oxide and deionized water into a reaction kettle, stirring for 40-50min at 20-25 ℃ and 500-600r/min, then adding sodium dodecyl sulfate, continuing stirring for 1-2h, performing ultrasonic dispersion for 40-60min, then adding modified zero-valent iron composite attapulgite powder and deionized water, continuing stirring for 2-3h, standing for 12-14h, filtering, collecting precipitate, washing the precipitate with deionized water and absolute ethyl alcohol for 2-4 times respectively, and performing vacuum drying at 60-80 ℃ for 1-2h to obtain modified attapulgite composite powder.
  2. 2. The thickening suspending agent containing modified attapulgite according to claim 1, wherein the dosage ratio of the flumetralin, the modified attapulgite composite powder, the diisooctyl sodium sulfonate succinate, the organosilicon defoamer, the polyethylene glycol, the xanthan gum and the deionized water is 30-40g:0.5-0.7g:9-10g:0.5-0.7g:1-2g:0.1-0.2g:60-70g.
  3. 3. The thickening suspension comprising modified attapulgite according to claim 1, wherein the acidified attapulgite powder is obtained by acidifying an attapulgite powder having an average particle diameter of 5 μm with hydrochloric acid.
  4. 4. The thickening suspending agent containing modified attapulgite according to claim 1, wherein the dosage ratio of the ferric sulfate heptahydrate, the acidified attapulgite powder, the deionized water, the absolute ethanol and the sodium borohydride solution is 40-50 g/40-42 g/500-520 mL/120-140 mL/150-170 mL.
  5. 5. The thickening suspending agent containing modified attapulgite according to claim 1, wherein the dosage ratio of the ethanol, the zero-valent iron composite attapulgite powder and the gamma-aminopropyl triethoxysilane is 1.5-1.7L:30-35g:10-20g.
  6. 6. The thickening suspending agent containing modified attapulgite according to claim 1, wherein the dosage ratio of graphene oxide, deionized water, sodium dodecyl sulfate, modified zero-valent iron composite attapulgite powder and deionized water is 0.4-0.8g:2-3L:5-10g:20-25g:1.8-2L.

Description

Thickening suspending agent containing modified attapulgite and application thereof Technical Field The invention belongs to the technical field of thickening suspending agents, and particularly relates to a thickening suspending agent containing modified attapulgite and application thereof. Background As a natural one-dimensional nano material, the attapulgite is low in price and rich in reserves, is a potential reinforcing body and can improve the mechanical property of a polymer, but the attapulgite is easy to agglomerate and poor in compatibility with a polymer matrix. At present, the multidimensional nanocomposite prepared from the nano materials with different dimensions becomes a research hot spot, the multidimensional nanocomposite is assembled into a specific structure by utilizing the difference of agglomeration modes of the nano materials with different dimensions, the agglomeration of the nano materials can be restrained mutually by utilizing the difference, the compatibility with polymers is improved, and meanwhile, the multidimensional nanocomposite has the respective advantages of the two materials. The Chinese patent with publication number CN116035000A discloses a stable floxuridine suspending agent and a preparation method thereof, in the scheme, modified attapulgite is prepared, the attapulgite is subjected to acidification and sodium treatment, then is subjected to high-temperature treatment, and partial soluble impurities and bound water in the attapulgite are removed, so that the surface area of the attapulgite is increased, sodium ions can react with acidic active sites in the attapulgite at high temperature, the acid value of the attapulgite is improved, the hydrophilic and lipophilic properties of the attapulgite are increased, and then the attapulgite is further treated by cetyl trimethyl ammonium bromide, so that long-chain organic carbon chains can enter interlayer gaps generated by the attapulgite, and the suspension property is further improved. However, when the attapulgite is used as a nano rod with the diameter of 10-30nm and the length of 1-2 mu m, the high surface energy of the nano rod tends to be entangled into aggregates, the attapulgite is still easy to agglomerate in the scheme, and the nano rod cannot achieve the optimal effect when being compounded with different types of wetting penetrating agents, defoaming agents, antifreezing agents and thixotropic agents. Disclosure of Invention The invention aims to provide a thickening suspending agent containing modified attapulgite and application thereof, wherein the impurity content of the surface of the attapulgite is reduced, the surface area and the porous property are increased after acidification treatment, the loading rate of zero-valent iron can be improved, the zero-valent iron is uniformly loaded on tubular pore channels or surfaces of the attapulgite by nano particles, the surface roughness of composite powder is further increased, stronger steric hindrance can be formed around pesticide particles, the pesticide particles are prevented from being aggregated and enlarged due to collision, so that sedimentation is reduced, the thickening suspending agent containing the modified attapulgite has good suspension property and dispersibility, and the loading of the zero-valent iron can endow the thickening suspending agent containing the modified attapulgite with the capability of chelating heavy metals, so that the heavy metals in the pesticide are prevented from damaging crops. The aim of the invention can be achieved by the following technical scheme: a thickening suspending agent containing modified attapulgite is prepared by the following steps: And firstly, reducing iron ions on the surface of the acidified attapulgite powder by using a liquid phase reduction method and taking the acidified attapulgite powder as a carrier through sodium borohydride to obtain the zero-valent iron composite attapulgite powder. And secondly, treating the zero-valent iron composite attapulgite powder by gamma-aminopropyl triethoxysilane to obtain the modified zero-valent iron composite attapulgite powder. And thirdly, intercalation is carried out on graphene oxide by utilizing sodium dodecyl sulfate, and then the obtained graphene oxide sheet is compounded with modified zero-valent iron compound attapulgite powder through electrostatic assembly action, so as to obtain modified attapulgite compound powder. And step four, taking the flumetralin, the modified attapulgite composite powder, the diisooctyl succinate sodium sulfonate, the organosilicon defoamer, the polyethylene glycol antifreeze, the xanthan gum and the deionized water as raw materials, and shearing at high speed, grinding and refining to obtain the thickening suspending agent containing the modified attapulgite. Further, the acidified attapulgite powder is obtained by acidifying attapulgite powder with an average particle size of 5 μm with hydrochloric acid. Further, the