High molecular weight and moderate sulfonation degree lignin-based pesticide dispersant and its preparation method
A lignin-based, high-molecular-weight technology, applied in botany equipment and methods, biocides, animal repellants, etc., can solve the problems of small molecular weight and poor dispersion performance of dispersants, and achieve strong adsorption stability and strong adsorption Ability, hydrophilic group and lipophilic group distribution obvious effect
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[0039] Example 1: Weigh 50g of wood pulp papermaking black liquor powder, add 50mL, 10mol / L NaOH solution to swell for 30min at room temperature; then add 20g of benzyl chloride, stir the oil bath and raise the temperature to 100°C for etherification reaction for 3h ; Add 300g of water, 100g of sodium lignosulfonate, 25g of aqueous formaldehyde (formaldehyde content of 37%), and copolymerize at 85°C for 3h. Finally, a sulfuric acid solution with a mass concentration of 20% is used to adjust the pH to 7, and then the product is cooled to room temperature to obtain a lignin-based pesticide high-efficiency dispersant liquid product.
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[0040] Example 2: Weigh 50g of bamboo pulp black liquor powder, add 50mL, 10mol / L NaOH solution to swell for 60min at room temperature; then add 30g of benzyl chloride, stir the oil bath and heat up to 95°C for etherification reaction for 2h; Add 200 g of water, 60 g of sodium lignosulfonate, and 40 g of aqueous formaldehyde solution (the mass content of formaldehyde is 37%), and the copolymerization reaction is carried out at 95°C for 2 hours. Finally, a nitric acid solution with a concentration of 20 wt% is used to adjust the pH to 7, and then the product is cooled to room temperature to obtain a liquid product of a lignin-based pesticide high-efficiency dispersant.
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[0041] Example 3: Weigh 50g wheat straw pulp black liquor powder, add 50mL, 10mol / L NaOH solution to swell for 40min at room temperature; then add 20g benzyl chloride, stir the oil bath to heat up to 110°C and then carry out etherification reaction for 4h; Add 300 g of water, 70 g of sodium lignosulfonate, and 50 g of an aqueous formaldehyde solution (the mass content of formaldehyde is 37%), and the copolymerization reaction is carried out at 95° C. for 2 hours. Finally, a 20wt% hydrochloric acid solution is used to adjust the pH to 8, and then the product is cooled to room temperature to obtain a lignin-based pesticide high-efficiency dispersant liquid product.
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