SLOW RELEASE DIAZINON DARI MIKROKAPSUL MELAMIN UREA FORMALDEHID
| Main Authors: | , Retno Sulistyo Dhamar Lestari, , Prof. Ir. Rochmadi, SU., Ph.D. |
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| Format: | Thesis NonPeerReviewed |
| Terbitan: |
[Yogyakarta] : Universitas Gadjah Mada
, 2013
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| Subjects: | |
| Online Access: |
https://repository.ugm.ac.id/120665/ http://etd.ugm.ac.id/index.php?mod=penelitian_detail&sub=PenelitianDetail&act=view&typ=html&buku_id=60703 |
Daftar Isi:
- Slow release concept is the control of active compound releasing from microcapsules to protect the active compound which is soluble conventionally by semi permeable coating, water insoluble, or porous permeable material. By designing the thickness of the microcapsules wall, the active compound diffusion can be controlled. This research is started from resin melamine urea formaldehyde formulation, microcapsules forming, and testing of pesticide releasing rate from MUF microcapsules. This research aims to study the character from MUF microcapsule made in different process condition and measure the diazinon releasing rate from the microcapsules with the variation of medium pH variation and microcapsules wall thickness. MUF microcapsule was prepared by the in-situ method of polymerization at the temperature of 50oC, pH of 3, homogenization of 30 minutes, and microencapsulation of 2 hours using of resin solution pre polymer melamine urea formaldehyde, diazinon, palm oil and surfactant sodium dodecyl sulfate (SDS) and polyvinyl alcohol (PVA). The characterization of the microcapsules produced is done by using optical microscope. The pesticide release rate measurement was done by soaking a number of MUF microcapsule in distillated water in various pH and microcapsules wall thickness. The experimental result shows that MUF microcapsules has diameter range of 50 up to 160 Î1⁄4m. Without surfactant addition, the microcapsules has thickness of 13,8 Î1⁄4m, by SDS and PVA addition, the thickness of microcapsules wall is 7,55 Î1⁄4m. By SDS and PVA addition, the microcapsules size is decrease as 45% and the average diazinon release rate is increase as 74%. The condition of slow release can be achieve at MUF microcapsuleâ��s thickness of ± 20Î1⁄4m. MUF microcapsules thickness can be controlled by making the variation of the surfactant addition at the process of microcapsules production.