CN1305378C - Aqueous emulsion of natural pyrethrum, and its prepn. method - Google Patents

Abstract

The present invention relates to a natural pyrethrin aqueous emulsion and a preparation method thereof. The natural pyrethrin aqueous emulsion comprises the following components according to the percentage by weight: 0.5 to 5% of natural pyrethrin active component, 0.25 to 10% of limonene plant extract used as synergistic agents, 0.05 to 0.4% of rosemary used as stabilizing agents, 0.25 to 2% of tween 80, 1 to 20% of beta-cyclodextrin hydrate, 10 to 30% of nonionic emulsifier and 10% of solutizer. The disinsection component, synergistic agent and stabilizing agent of the natural pyrethrin aqueous emulsion of the present invention are all natural plant products, the present invention has the advantages of very low toxicity and almost no side effect and can be used without the limitation from any country in the world, the use range is enlarged from the original control of flies, mosquitoes and aphids to be directly used for controlling the indoor destructive insects at home and the destructive insects in fields such as aphids, locusts, etc., and the products have germicide effect.

Description

Aqueous emulsion of natural pyrethrum and preparation method thereof

Technical field

The present invention relates to the insecticide technical field, specifically aqueous emulsion of natural pyrethrum and preparation method thereof.

Background technology

Existing natural pyrethrum insecticide variety is more, wherein the Dalmatian chrysanthemum aqueous emulsion since in its preparation process institute add beta cyclodextrin and have the microcapsules effect, the microcapsules people acts on the pyrethrin insecticidal action is slowed down, and is also referred to as the pyrethrin sustained release agent.This to insecticide brought as: strengthened the stability of pyrethrin, made advantages such as its range of application is wider.But in order to increase the insecticidal action of pyrethrin, added compound such as Butacide to improve its insecticidal activity in preparation, these compounds have certain harm to human and environment during machine, are limited the use of in developed country and area.

Summary of the invention

The purpose of this invention is to provide a kind of physicochemical property effectively improved greatly, strengthen aqueous emulsion of natural pyrethrum of stability and safety and preparation method thereof.

Technical scheme of the present invention is: aqueous emulsion of natural pyrethrum contains percentage by weight natural pyrethrum active ingredient 0.5～5%, synergist citrene class plant extracts 0.25～10%, stabilizing agent rosemary, (plant extracts) 0.05～0.4%, Tween 80 0.25～2%, beta cyclodextrin 1～20%, nonionic emulsifier 10～30%, cosolvent 10%.

The preparation method carries out according to the following steps:

1) takes by weighing pyrethrosin primary medicine, citrene class plant extracts, rosemary, according to quantity, fully dissolve with cosolvent;

2) with beta cyclodextrin and emulsifier mixing, dissolve with cosolvent;

3) merge 1) and 2), fill up the water yield, with efficient mulser speed of agitator greater than 2000 rev/mins, pressure greater than the condition of 1.5 MPas under fully stirring, emulsification obtains aqueous emulsion of natural pyrethrum.

Pyrethrum element pesticide of the present invention is just to find the scope of application wideer through a large amount of screenings, synergist and stabilizing agent that insecticidal action further improves, both solved the shortcoming that the pyrethrin insecticide is seen photolysis, increased its insecticidal activity again, make it greatly reduce toxicity and side effect, strengthened the safety of using.In preparation process, adopt high-revolving efficient mulser processing, make the physicochemical property of product that bigger improvement be arranged, strengthened stability, make formulation products not stratified, improved the outward appearance of product simultaneously.

Its insecticidal constituent of aqueous emulsion of natural pyrethrum of the present invention, synergist and stabilizing agent all are natural plant product, and its toxicity is extremely low, almost have no side effect, and any country that can be worldwide uses and unrestricted.Its range of application is is also prevented and treated fly, mosquito, aphid from original being used to and is expanded the control that can be directly used in household control indoor pest and be used for agricultural pests (aphid, leech worm etc.) to, and this product has fungicide effect concurrently simultaneously.

Embodiment

Embodiment 1:

1) take by weighing 50% pyrethrosin primary medicine 1%, citrene class plant extracts tangerine oil 0.25%, rosemary, 0.05% according to quantity, beta cyclodextrin 1% fully dissolves with cosolvent 10%;

2) with Tween 80 0.25% and nonionic emulsifier 5202 or 2,201 10% mixings;

3) merge 1) and 2), adding water to pyrethrin content is 0.5%, speed of agitator greater than 2000 rev/mins, pressure greater than the condition of 1.5 MPas under fully stirring, emulsification obtains containing the aqueous emulsion of natural pyrethrum active component 0.5%.

Embodiment 2:

1) take by weighing 50% pyrethrosin primary medicine 6%, citrene class plant extracts tangerine oil 5%, rosemary, 0.2% according to quantity, beta cyclodextrin 10% fully dissolves with cosolvent 10%;

2) with Tween 80 1% and nonionic emulsifier 5202 or 2,201 20% mixings;

3) merge 1) and 2), adding water to pyrethrin content is 3%, speed of agitator greater than 2000 rev/mins, pressure greater than the condition of 1.5 MPas under fully stirring, emulsification obtains containing natural pyrethrum active component 3% aqueous emulsion.

Embodiment 3:

1) take by weighing 50% pyrethrosin primary medicine 10%, citrene class plant extracts tangerine oil 10%, rosemary, 0.4% according to quantity, beta cyclodextrin 20% fully dissolves with cosolvent 10%;

2) with Tween 80 2% and nonionic emulsifier 5202 or 2,201 30% mixings;

3) merge 1) and 2), adding water to pyrethrin content is 5%, speed of agitator greater than 2000 rev/mins, pressure greater than the condition of 1.5 MPas under fully stirring, emulsification obtains containing natural pyrethrum active component 5% aqueous emulsion.

Claims (2)

1, a kind of aqueous emulsion of natural pyrethrum is characterized in that containing percentage by weight natural pyrethrum active ingredient 0.5～5%, synergist citrene class plant extracts 0.25～10%, stabilizing agent rosemary, 0.05～0.4%, Tween 80 0.25～2%, beta cyclodextrin 1～20%, nonionic emulsifier 10～30%, cosolvent 10%.

2, the preparation method of the described aqueous emulsion of natural pyrethrum of claim 1 is characterized in that carrying out according to the following steps:

1) takes by weighing pyrethrosin primary medicine, citrene class plant extracts, rosemary, according to quantity, fully dissolve with cosolvent;

2) with beta cyclodextrin and emulsifier mixing, dissolve with cosolvent;

3) merge 1) and 2), fill up the water yield, speed of agitator greater than 2000 rev/mins, pressure greater than the condition of 1.5 MPas under fully stirring, emulsification obtains aqueous emulsion of natural pyrethrum.