Agricultural wetting dispersant and preparation method thereof
A wetting and dispersing agent and catalyst technology, which is applied in the field of agricultural wetting and dispersing agents and their preparation, can solve the problems of increasing usage of adjuvants, high prices, and failure to achieve large-scale production, and improve dispersion stability and preparation process. Simple, reduce the effect of aggregation and settlement
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[0013] An agricultural wetting and dispersing agent and a preparation method thereof, characterized in that: comprising the following steps;
[0014] Step 1: Add maleic anhydride and a compound containing active hydrogen in proportion to a four-necked flask, a certain amount of ethylene oxide-propylene oxide block copolymer, and the catalyst is Lewis acid; wherein maleic anhydride The ratio of the amount of the active hydrogen compound to the amount of the active hydrogen compound is 1: (215-219);
[0015] Step 2: Install the thermometer, stirring paddle and condensing reflux device, turn on the stirrer and electric heating mantle, heat to 135-165°C for 20 minutes, and turn on the vacuum pump at the same time, and carry out decompression esterification at 7414-2165kPa, the reaction time is 4-7 Hour;
[0016] Step 3: Cool the esterification reaction mixture to 80°C, add W (sodium bisulfite) = 30% aqueous solution, add and stir and pass in nitrogen, control the temperature at 8...
Embodiment 1
[0019] (1) Preparation of wetting agent
[0020] Introduce 43 parts of n-heptanol, 0.2 parts of maleic anhydride, 56.8 parts of ethylene oxide, and 0.2 parts of zinc chloride into a four-necked flask equipped with a thermometer, a stirring paddle and a condensing reflux device, seal it, and open it Stirrer, heat up to 150°C, turn on the vacuum pump at the same time, carry out esterification reaction at 7414-2165kPa, after cooling the esterification reaction product to 80°C, add W (sodium bisulfite) = 30% aqueous solution, add and stir Nitrogen gas is introduced, the temperature is controlled at 80-90° C., and the reaction is carried out under normal pressure to obtain a light yellow solid. The target air flow is crushed to obtain the target wetting agent powder.
[0021] (2) Determination of the suspension rate and wetting time of the prepared wetting agent to the pesticide water-dispersible granules
[0022] Use the prepared wetting agent to prepare water-dispersible granule...
Embodiment 2
[0026] Introduce 43.2 parts of lauryl alcohol, 0.2 parts of maleic anhydride, 56.6 parts of ethylene oxide, and 0.2 parts of zinc chloride into a four-neck flask equipped with a thermometer, a stirring paddle and a condensing reflux device, seal it, and open it for stirring Warm up to 150°C, turn on the vacuum pump at the same time, carry out the esterification reaction at 7414-2165kPa, cool the esterification reaction product to 80°C, add W (sodium bisulfite) = 30% aqueous solution, stir and pass Inject nitrogen, control the temperature at 80-90°C, react under normal pressure to obtain a light yellow solid, pulverize the target air flow to obtain the target wetting agent powder.
[0027] According to the prepared wetting agent and the prepared pesticide water-dispersible granules of the wetting agent, the suspension rate of the achloride water-dispersible granules is 95.6%. The suspension rate was 97.2%.
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