Search

CN-122004242-A - Antifungal biological coating agent for ornamental flower seeds and preparation method thereof

CN122004242ACN 122004242 ACN122004242 ACN 122004242ACN-122004242-A

Abstract

The invention relates to the technical field of ornamental flower seeds, in particular to an antifungal biological coating agent for ornamental flower seeds and a preparation method thereof, wherein the antifungal biological coating agent for ornamental flower seeds comprises, by weight, 1.5-3g of a polymer film forming agent, 0.7-1.5g of an antibacterial polymer powder, 0.1-0.3g of a composite antifungal agent, 2-5g of an auxiliary agent, 90-95g of an inorganic mineral filler and 0.5-1.5g of a binder. The coating agent can realize multiple functions of disease prevention, growth promotion and water retention by once coating, reduces the labor and material cost of follow-up topdressing and pesticide spraying, and has good application prospect.

Inventors

  • Bi Hongxian

Assignees

  • 苏州立美园艺科技有限公司

Dates

Publication Date
20260512
Application Date
20260127

Claims (10)

  1. 1. The antifungal biological coating agent for ornamental flower seeds is characterized by comprising the following components in parts by weight: 1.5-3g of polymer film forming agent, 0.7-1.5g of antibacterial polymer powder, 0.1-0.3g of composite antifungal agent, 2-5g of auxiliary agent, 90-95g of inorganic mineral filler and 0.5-1.5g of adhesive.
  2. 2. The antifungal biocoating agent for ornamental flower seeds of claim 1 wherein the polymeric film forming agent comprises at least one of carboxymethyl hydroxypropyl guar, hydroxypropyl methylcellulose (HPMC), sodium carboxymethyl cellulose (CMC sodium).
  3. 3. The antifungal biological coating agent for ornamental flower seeds according to claim 1, wherein the method for preparing the antibacterial polymer powder comprises the steps of: s1, dissolving L-menthol in dichloromethane, adding cyanuric chloride and a catalyst under stirring and ice water bath cooling, and then reacting in ice bath to remove impurities to obtain monosubstituted cyanuric chloride; S2, adding monosubstituted cyanuric chloride, 4-aminobenzoic acid and a catalyst into N, N-dimethylformamide, heating, stirring and refluxing, cooling to room temperature, adjusting pH, filtering and collecting solid, washing, and vacuum drying to obtain modified cyanuric chloride; And S3, mixing the modified cyanuric chloride, the hydrophilic comonomer, the ethylene glycol, the catalyst and the methylene dichloride in an ice bath condition, slowly dripping a condensing agent after stirring treatment, continuously reacting for 0.3-0.7h in the ice bath, heating to room temperature and refluxing by heating, continuously stirring for reaction, removing impurities, drying in vacuum, grinding and sieving to obtain the antibacterial polymer powder.
  4. 4. The antifungal biological coating agent for ornamental flower seeds according to claim 3, wherein in S1, the amount ratio of L-menthol, methylene chloride, cyanuric chloride and catalyst is 9.4-19g:20-40ml:5.5-11g:4-8mL, the catalyst is 2,4, 6-trimethylpyridine, the reaction time is 10-14h, the method of removing impurities comprises the steps of washing 3-5 times with water after the reaction in an ice bath, separating and drying the organic phase with anhydrous sodium sulfate, filtering, concentrating by rotary evaporation to remove the solvent, and purifying the crude product by adopting silica gel column chromatography with eluent of petroleum ether and methylene chloride with the volume ratio of 5:1.
  5. 5. The antifungal biological coating agent for ornamental flower seeds according to claim 3, wherein in S2, the amount ratio of monosubstituted cyanuric chloride, 4-aminobenzoic acid, catalyst, N-dimethylformamide is 1.8-3.6g:4.1-8.2g:0.2-0.4g:20-40mL, the catalyst is pyridine, the heating temperature is 115-125 ℃, the stirring reflux time is 5-7h, the pH is adjusted to 3.0 by 10wt% hydrochloric acid solution, the washing method is 3-5 times by water, and the vacuum drying method is vacuum drying to constant weight at 55-65 ℃.
  6. 6. The antifungal biological coating agent for ornamental flower seeds according to claim 3, wherein in S3, the amount ratio of the modified cyanuric chloride, the hydrophilic comonomer, the ethylene glycol, the catalyst, the methylene chloride and the condensing agent is 8-16g:1.6-3.2g:1-2 g:0.27-40 ml:6.1-12.2g, the hydrophilic comonomer is PEG-400, the catalyst is 4-dimethylaminopyridine p-toluenesulfonate, the stirring treatment time is 20-30min, the slow dropping time is 25-35min, the condensing agent is Diisopropylcarbodiimide (DIC), the continuous reaction time is 0.3-0.7h, the heating temperature is 40-45 ℃, the continuous stirring reaction time is 96-120h, the impurity removing method is to precipitate by dripping 200mL ice-cold anhydrous diethyl ether, and washing 3-5 times with a mixed solution of diethyl ether and methanol, the vacuum drying method is to constant weight under 40-50 ℃, and the particle size of the antibacterial polymer is 50 μm.
  7. 7. The antifungal biological coating agent for ornamental flower seeds according to claim 1, wherein the compound antifungal agent is obtained by compounding bacillus subtilis and actinomycetes in a mass ratio of 1:1.
  8. 8. The antifungal biological coating agent for ornamental flower seeds according to claim 1, wherein the auxiliary agent comprises, by weight, 0.5-1.5g of potassium humate, 0.5-1.5g of seaweed extract, 0.05-0.15g of amino oligosaccharin, and 0.001-0.005g of gibberellin.
  9. 9. The antifungal biological coating agent for ornamental flower seeds according to claim 1, wherein the seaweed extract is obtained by blending seaweed polysaccharide and seaweed oligosaccharide in a mass ratio of (2-5) 1, the inorganic mineral filler comprises, by weight, 30-40g of diatomite, 25-35g of calcined kaolin, 15-25g of zeolite powder, 5-10g of anhydrous kainite powder, and the binder is polyvinyl alcohol powder.
  10. 10. A method for preparing an antifungal biological coating for ornamental flower seeds according to any one of claims 1-9, comprising the steps of: Mixing inorganic mineral filler in proportion for 30-40min, adding polymer film forming agent, binder, composite antifungal agent and adjuvant, mixing for 20-30min, adding antibacterial polymer powder, mixing for 10-15min, and sieving with 100 mesh sieve to obtain antifungal biological coating agent for ornamental flower seed.

Description

Antifungal biological coating agent for ornamental flower seeds and preparation method thereof Technical Field The invention belongs to the technical field of ornamental flower seeds, and particularly relates to an antifungal biological coating agent for ornamental flower seeds and a preparation method thereof. Background Ornamental flowers are an important component of the global gardening industry, and the seedling quality directly influences the economic benefit of flower production. Ornamental flower seeds are tiny (such as petunia and pansy), thin in seed coat and large in specific surface area, are easy to be mechanically damaged in the sowing and seedling raising processes, have weak natural antibacterial barriers on the surfaces, are high in oil content, vigorous in respiration in germination processes, sensitive to moisture and oxygen requirements, and are easy to suffer from soil-borne fungus diseases such as damping off, damping off and gray mold in a humid environment, so that the seedling emergence rate is low. Although the traditional chemical bactericides (such as carbendazim and thiram) are effective, the traditional chemical bactericides have the risks of residual toxicity, environmental pollution and drug resistance and do not accord with the trend of organic gardening and ecological planting. Thus, there is an urgent need for a biological coating agent with physical protection, biological control, and nutrient supply. Disclosure of Invention The invention aims to provide an antifungal biological coating agent for ornamental flower seeds and a preparation method thereof, which are used for solving the technical problems in the prior art. In order to achieve the above purpose, the present invention adopts the following technical scheme: The technical scheme provided by the invention is as follows: In a first aspect, the invention provides an antifungal biological coating agent for ornamental flower seeds, which comprises the following components in parts by weight: 1.5-3g of polymer film forming agent, 0.7-1.5g of antibacterial polymer powder, 0.1-0.3g of composite antifungal agent, 2-5g of auxiliary agent, 90-95g of inorganic mineral filler and 0.5-1.5g of adhesive. Preferably, the polymeric film former comprises at least one of carboxymethyl hydroxypropyl guar, hydroxypropyl methylcellulose (HPMC), sodium carboxymethyl cellulose (CMC sodium). Preferably, the preparation method of the antibacterial polymer powder comprises the following steps: s1, dissolving L-menthol in dichloromethane, adding cyanuric chloride and a catalyst under stirring and ice water bath cooling, and then reacting in ice bath to remove impurities to obtain monosubstituted cyanuric chloride; In the above process, the first chlorine atom of cyanuric chloride is replaced by menthol. S2, adding monosubstituted cyanuric chloride, 4-aminobenzoic acid and a catalyst into N, N-dimethylformamide, heating, stirring and refluxing, cooling to room temperature, adjusting pH, filtering and collecting solid, washing, and vacuum drying to obtain modified cyanuric chloride; In the above process, the remaining two chlorine atoms on the triazine ring are replaced by para aminobenzoic acid, providing a carboxyl reactive site for subsequent polymerization. And S3, mixing the modified cyanuric chloride, the hydrophilic comonomer, the ethylene glycol, the catalyst and the methylene dichloride in an ice bath condition, slowly dripping a condensing agent after stirring treatment, continuously reacting for 0.3-0.7h in the ice bath, heating to room temperature and refluxing by heating, continuously stirring for reaction, removing impurities, drying in vacuum, grinding and sieving to obtain the antibacterial polymer powder. According to the technical scheme, a hydrophilic comonomer PEG-400 chain segment is introduced, a stable hydrophilic micro-region is built in a polymer on the premise of not damaging an inherent hydrophobic antibacterial skeleton, the effects of external hydrophobic adhesion resistance and internal hydrophilic water permeability are achieved, the hydrophobic and membrane damage effects are that an L-menthol fragment is a strong hydrophobic group, can be inserted into and damage a lipid bilayer structure of a cell membrane through hydrophobic interaction, and can disturb the regular arrangement of proteins and lipids on the membrane, so that the permeability of the cell membrane is increased, important substances such as potassium ions, ATP, nucleic acids and the like in the cell are leaked, finally, the cell metabolism disorder and energy exhaustion are caused to die, and a triazine ring is an electron-rich system, can generate electrostatic interaction with positive charge components on the surface of a fungal cell membrane or biological macromolecules with negative charges in the cell membrane, and interfere the normal functions of the cell membrane and nucleic acid metabolism of the microorganism. Preferably, in the S1, t