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[目的]为研究不同乳化方法对农药水乳剂物理稳定性的影响,通过稳定性分析仪扫描和粒径测试研究了4种乳化方法制备30%毒死蜱.噻嗪酮水乳剂的稳定性。[结果]溶剂用量12%时,乳化剂加入油相时水乳剂粒径较小;扫描后1#和3#轻微沉降、2#和4#沉降明显,稳定性指数表明1#最稳定。溶剂用量27%时,1#粒径最小;扫描后1#变化不显著、2#沉降明显,1#粒径变化较小且最稳定。样品存放后外观与短期扫描结果一致。[结论]制备工艺对水乳剂稳定性影响显著,当溶剂用量27%时,采取将乳化剂加入油相中混匀后再逐渐加入水相中剪切为制备该制剂的最佳工艺。
[Objective] The research aimed to study the effect of different emulsification methods on the physical stability of pesticide water emulsion. The stability of 30% chlorpyrifos and buprofezin emulsion prepared by four kinds of emulsification methods was studied by means of stability analyzer scanning and particle size test. [Result] When the amount of solvent was 12%, the particle size of water emulsion was small when the emulsifier was added to the oil phase. After # 1 and 3 # scanning, slight sedimentation, the settlement of # 2 and # 4 was obvious, and the stability index showed that 1 # was the most stable. When the amount of solvent was 27%, the particle size of # 1 was the smallest; the change of # 1 was not significant after scanning, the settlement of # 2 was obvious and the change of particle # 1 was small and stable. The appearance of the sample after storage is consistent with the results of short-term scanning. [Conclusion] The preparation process had a significant effect on the stability of the aqueous emulsion. When the amount of solvent was 27%, the emulsifier was added into the oil phase and then gradually added into the aqueous phase to prepare the best preparation.