5 results about "Captan" patented technology

The invention relates to the technical field of pesticide synthesis, and discloses a synthesis method of captan. The preparation method comprises the following steps: respectively dropwise adding an aqueous solution of an alkali metal compound and perchloromethyl mercaptan into an aqueous solution of 1, 2, 3, 6-tetrahydrophthalimide, and controlling the pH value of a reaction system to be 7-11 in the dropwise adding process; and reacting after dropwise adding to obtain captan. According to the method, the alkali metal compound aqueous solution and the perchloromethyl mercaptan are dropwise added, and the pH value of a reaction system is controlled within a specific range in the dropwise adding process, so that decomposition of 1, 2, 3, 6-tetrahydrophthalimide and perchloromethyl mercaptan in an alkaline environment can be effectively avoided, the occurrence of series side reaction can be effectively reduced, and the yield of 1, 2, 3, 6-tetrahydrophthalimide and perchloromethyl mercaptan is improved. The utilization rate of the raw materials and the product yield are improved under the condition of not using a catalyst.

The invention belongs to the technical field of pesticides, and relates to 11 bactericide compositions for mainly preventing and treating crop diseases caused by pyricularia oryzae and colletotrichum gloeosporioides. The compound YJY-22 provided by the invention is novel in structure and unique in action mode, and has no cross resistance with isoprothiolane, fenoxanil, pyraclostrobin, tricyclazole, azoxystrobin, mancozeb, captan, difenoconazole, prochloraz, chlorothalonil and tebuconazole. As the action mechanism of the compound YJY-22 is different from that of the medicament, and the compound YJY-22 and the medicament have no cross resistance, the compound YJY-22 and the medicament are compounded, so that the sterilization range can be expanded, the sterilization effect can be enhanced, the drug resistance of phytopathogen can be delayed, the safety to crops is good, the prevention and control spectrum is expanded, and the requirements of pesticide reduction and synergism are met.

11 fungicide compositions mainly used for controlling crop diseases caused by Pyricularia oryzae and Colletotrichum spp.. Compound YJY-22 has a novel structure and a unique mode of action, and exhibits no cross-resistance with isoprothiolane, fenoxanil, pyraclostrobin, tricyclazole, azoxystrobin, mancozeb, captan, difenoconazole, prochloraz, chlorothalonil, or tebuconazole. Because compound YJY-22 and the described agents have different mechanisms of action and have no cross-resistance, combining compound YJY-22 and the described agents not only can broaden the antifungal spectrum and enhance antifungal efficacy, but also can delay fungicide resistance of plant pathogens, ensure high crop safety, expand the control spectrum, and meet the requirement of pesticide reduction with increased efficiency.

The invention discloses a method for catalytically synthesizing captan by using supergravity equipment, which comprises the following step: by taking tetrahydrophthalimide sodium salt and perchloromethyl mercaptan as raw materials, water as a solvent and supported solid acid as a catalyst, reacting in a supergravity reactor to obtain the captan. The supergravity reactor and the supported solid acid catalyst have a synergistic effect, the supergravity reactor strengthens reactant mass transfer on the surface of the catalyst, acid sites of the catalyst accelerate reaction kinetics, and the supergravity reactor and the supported solid acid catalyst synergistically improve reaction selectivity. Compared with a traditional water-phase synthesis method with sodium hydroxide as a catalyst, the captan yield is increased by 7.5-10%, the catalyst can be recycled, wastewater COD is reduced, and the method is more environmentally friendly.

The present invention provides a fungicide mixture formulation system comprising an effective amount of a phthalimidine fungicide selected from the group consisting of folpet, captan, and any combination thereof; an effective amount of a second fungicide that is prothioconazole; and an effective amount of a compatibility agent.