Abstract
This paper describes How two kinds of porous particles made of wasted fine clayey particles (roseki) can be utilized as carriers in solid formulations.
Firstly, spray-dried particles having a mass median diameter of approximately 24μm, which have been produced from roseki slurry by a spray drying method, have been utilized as a carrier in DL dust. Next, the other agglomerates having a mass median diameter of approximately 130μm, which have been made by coating pulverized Toyoura sand with roseki particles, have also been utilized as a carrier in F micro-granules.
The conclusions obtained are summarized as follows:
1.It was clarified by measuring the adhesive property of particles that both the spray-dried particles and the coated particles have to a certain degree the ability to imbibe liquids into them. This is completely different from the ability of carriers on the market.
2. The DL dust and the F micro-granule prepared by impregnating the spray-dried particles and the coated particles, respectively, with agricultural chemicals, were found to nearly satisfy the standards which are generally used between the makers and users in regard to solid formulations. Then, the biological effectiveness of the newly developed solid formulations for insects was also recognized to be approximately equal to the effectiveness of the solid formulations on the market.
3. The influence of the size and density of a particle on the distance drifted by air flow, was analyzed on the basis of the equation of motion of a spherical particle, and the analytical results were tabulated.
