ISSN:
0021-8995
Keywords:
Chemistry
;
Polymer and Materials Science
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
,
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
,
Physics
Notes:
A new technique has been developed for encapsulating pesticides for controlled release. The method consists in mixing starch, pesticide, and water; adding alkali to gelatinize the starch; and treating the mixture with boric acid. The solid product is a starch-borate adduct, entrapping the pesticide within small cells. Initially, the adduct is a rubbery gel which, when treated with alcohol or ground with additional pearl starch, yields particles suitable for drying to the 10-35-mesh range. When the starch is used to break up the gel, the technique is useful for retaining water-soluble compounds. Water-insoluble pesticides, emulsifiable concentrates, and wettable powders are encapsulated and recovered in high yields. Acid-labile pesticides such as diazinon are stable in the borate gel. The process was scaled up successfully by use of a double planetary mixer.
Additional Material:
2 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/app.1982.070271025
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