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一九六○年我们开始进行了DDT浓乳剂的研究,企图代替一部分DDT乳剂。浓乳剂除含有25%的DDT原粉外,只有30%左右的有机溶剂和少量纸浆废液固体物,因此,具有原料易得、成本低廉的特点(估计比DDT乳剂可降低成本百分之二十几左右)。浓乳剂中的DDT颗粒绝大多数为1—2微米,与乳剂的分散度相似,经过50℃和-20℃的贮藏稳定性试验,并无显著变化或变质失效。一九六一年配制的样品在长期贮藏过程中,有上部变稀下部变稠的分层现象。这种现象目前已基本克服。
In 1960 we started our research on DDT concentrates in an attempt to replace some DDT emulsions. Emulsion contains only about 25% of DDT raw powder, only about 30% of organic solvents and a small amount of pulp waste solids, therefore, the availability of raw materials, low cost (estimated than DDT emulsion can reduce the cost of two percent A dozen or so). The majority of DDT particles in concentrated emulsions are 1-2 microns, similar to the dispersions of emulsions, and show no significant changes or deterioration after 50 ° C and -20 ° C storage stability tests. In the long-term storage of samples prepared in 1961, there was a delamination phenomenon in which the upper part became thinner and the lower part became thicker. This phenomenon has basically been overcome.