Lignin-based pesticide dispersant with high carboxyl content and high molecular weight and preparation method thereof
A high molecular weight, lignin technology, applied in the field of lignin pesticide dispersant and its preparation, can solve the problems of narrow applicability and poor dispersion performance, and achieve the effects of increasing molecular weight, enhancing affinity and excellent dispersibility
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Embodiment 1
[0039] After 100 g of wood pulp alkali lignin and 100 g of catechol were mixed uniformly, 20 g of concentrated sulfuric acid was added, and the reaction was carried out at 115 ° C for 0.5 h. Then cooled to room temperature, dissolved in 200 g of absolute ethanol, taken out, poured into water for precipitation, suction filtered, washed with hot water, and dried to obtain phenolic wood pulp alkali lignin. The phenolic wood pulp alkali lignin and 30 g of octenyl succinic anhydride were placed in a reactor at room temperature, 800 g of dimethylformamide and 5 g of sodium hydroxide were added, and the mixture was stirred for 0.5 h. The temperature was raised to 80° C. and reacted for 2 h. After the reaction, the mixture was filtered, washed twice with ethanol with a mass concentration of 70%, and dried to obtain carboxylated wood pulp alkali lignin. The carboxymethylated wood pulp alkali lignin was added to water, dissolved into an aqueous solution with a concentration of 30% by ma...
Embodiment 2
[0044] After mixing 60g wood pulp alkali lignin, 20g bamboo pulp alkali lignin, 20g wheat straw alkali lignin and 200g catechol, add 40g concentrated sulfuric acid, and react at 105°C for 1 hour. Then cooled to room temperature, dissolved in 250 g of absolute ethanol, taken out, poured into water for precipitation, suction filtered, washed with hot water, and dried to obtain phenolic wood pulp alkali lignin. The phenolic wood pulp alkali lignin and 40 g of dodecenyl succinic anhydride were placed in a reactor at room temperature, 1000 g of dimethylformamide and 5 g of sodium hydroxide were added, and the mixture was stirred for 0.5 h. The temperature was raised to 95° C. and reacted for 2.5 h. After the reaction, the mixture was filtered, washed twice with ethanol with a mass concentration of 65%, and dried to obtain carboxylated wood pulp alkali lignin. The carboxymethylated wood pulp alkali lignin was added to water, dissolved into an aqueous solution with a concentration of...
Embodiment 3
[0046] After 100 g of wood pulp alkali lignin and 150 g of catechol were mixed uniformly, 30 g of concentrated sulfuric acid was added, and the reaction was carried out at 105 ° C for 1 h. Then cooled to room temperature, dissolved in 250 g of absolute ethanol, taken out, poured into water for precipitation, suction filtered, washed with hot water, and dried to obtain phenolic wood pulp alkali lignin. The phenolic wood pulp alkali lignin and 50 g of octenyl succinic anhydride were placed in a reactor at room temperature, 1200 g of dimethylformamide and 5 g of sodium hydroxide were added, and the mixture was stirred for 0.5 h. The temperature was raised to 80° C. and reacted for 2 h. After the reaction, the mixture was filtered, washed twice with ethanol with a mass concentration of 70%, and dried to obtain carboxylated wood pulp alkali lignin. The carboxymethylated wood pulp alkali lignin was added to water, dissolved into an aqueous solution with a concentration of 40% by mas...
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