木质素磺酸钠的超滤级分对40%腈菌唑WP性能的影响

Effect of sodium lignosulfonate’s ultrafiltration Fractions on 40% myclobutanil WP’s performance

摘要:

摘要：通过超滤将石岘木质素磺酸钠（简称木钠）分成五个相对分子质量（以下简称分子量）范围的级分。凝胶色谱和电位滴定测试表明，随着截留分子量由小变大，木钠超滤级分相对分子质量依次增大，重均分子量从2360增加到19852；磺酸根含量依次减小，从2.66 mmol/L降低到0.98 mmol/L。以木钠超滤的五个级分为分散剂制备质量分数为40%的腈菌唑WP并测试其性能。结果表明，Fraction4（30000-50000）做分散剂制备的WP性能最优，热贮前后的悬浮率分别为85.36%和81.38%，悬浮液中分散相的平均粒径分别为6.30 μm和9.19 μm，热贮后WP悬浮液2 h的沉淀层厚度及分散稳定指数分别为0.311 mm和3.85。

Abstract:

Abstract: Using the ultrafiltration method to divide Shixian sodium lignosulfonate (LS) into five molecular weight range Fractions. The gel permeation chromatography and potentiometric titration testing shows the relative molecular weight of LS is increased with the Fraction, from 2360 to 19852; the sulfonic acid content of LS is decreased with the Fraction, which is decreased from 2.66 mmol / L to 0.98 mmol / L. Using five Fractions’ LS as dispersants to prepare 40% myclobutanil WPs and test their performances, the results shows that WP’s performances are best when using the LS of Fraction4 (30000-50000) as dispersant, the suspension rate before and after heat storage are 85.36% and 81.38%, the average particle size of WP suspension’s disperse phase are 6.30 μm and 9.19 μm respectively, the 2 h suspension sedimentation layer thickness and the stability index of WP(after accelerated aging) are 0.311 mm and 3.85.