Cucumber downy mildew prevention and treatment method Agricultural control. Select disease-resistant varieties, strengthen the cultivation management centered on water control, water the small water, pay attention to ventilation and moisture. Applying the base fertilizer, adding phosphorus and potassium fertilizer, and spraying the photosynthetic nutrient film fertilizer on the foliar surface will help to enhance the disease resistance of the plant. Reasonable arrangement of planting density, timely removal of old leaves and diseased leaves, ventilation and light transmission in the field, timely drainage after rain, reducing the humidity in the field, can reduce the occurrence and spread of diseases. The cucumber in the greenhouse can be used in the high temperature shacking method. The greenhouse is closed for 2 hours at noon, so that the upper temperature of the plant reaches 44 to 46 °C, which can kill the downy mildew in the shed, once every 7 days. Chemical control. To prevent the main, when the downy mildew does not occur, start spraying a new high-fat film to form a polymer film to prevent. When a disease occurs, it is necessary to immediately cooperate with the targeted drug spraying, and the time cannot be delayed.
Epichlorohydrin, 3-Chloro-1, 2 - epoxypropene, chloropropylene oxide ,ECH .
Molecular Formula: CH2OCHCH2Cl, C3H5OCl
ITEMS
GUARANTEED SPEC
PURITY% (m/m)≥
99.9
DENSITY g/cm3
1.180-1.183
COLOR(pt-co)≤
10
MOISTURE%(m/m)≤
0.05
Epichlorohydrin (ECH) Epichlorohydrin (Ech),Epichlorohydrin 106-89-8,99.9% Epichlorohydrin,High Quality Epichlorohydrin Shandong Tiancheng Chemical Co., Ltd. , https://www.tianchengchemical.com
Properties: It is a volatile, unstable colorless liquid with irritating odor similar to chloroform and ether. Molecular weight is 92.85, density, 1.1806g/cm3, boiling point, 116.11°C, freezing point, -57.2°C, refractive index (nd20), 1.4382, flash point (open cup), 40.6°C, and ignition point, 415°C. It is slightly soluble in water, miscible with many organic solvents, and able to generate azeotrope with a variety of organic liquids.
Main Applications:
Epichlorohydrin is an important organic industrial chemical and a chlorine-consuming product in fine chemicals, mainly for producing epoxy resin, synthetic glycerin, epichlorohydrin rubber, nitroglycerine explosives, glass fiber reinforced plastics, and electrical insulation products, which are widely used in the chemical industry, light industry, transportation, medicine, electronics and other fields. It also can be used as solvent for cellulose ester, resin, and cellulose ether, and the raw material of plasticizer, stabilizer, surfactant, and chloroprene rubber.
Toxicity and Protection: It is highly toxic, absorbed through the skin, and irritating to skin and mucous membranes. In higher concentrations, it has the function of narcotism. When poisoning occurs, there will be eye irritation, conjunctivitis, rhinitis, lacrimation, cough, fatigue, gastrointestinal disorders, nausea and other symptoms. Serious poisoning may lead to anesthesia or even lung, liver or kidney damages. Lethal concentration of human beings is 20ppm. Lethal dose of rat is 5090mg/kg. The maximum allowable concentration in air is 5ppm (18mg/m3). Production equipment needs to be closed, air, circulating, and the operator, wear protective equipment. In addition, due to intense auto polymerization, epichlorohydrin can not be heated in the fire in case of container burst. As for reaction as reagent, it is appropriate to be diluted with inert solvent and slowly added.
Packaging, Storage and Transport:
As ferric chloride or stannic chloride can promote auto polymerization, epichlorohydrin should be stored in dry, clean iron barrel, 200kg each, and kept in a cool, ventilated, and dry place, away from fire and heat. Store and transport in accordance with the provisions of flammable toxic substances.
EPICHLOROHYDRIN SPECIFICATION DATA SHEET
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