Browsing by Author "Grande Tovar, Carlos David (Director)"
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Item Desarrollo de dos antiespumantes en Disproquin S.A.S con aplicación en el proceso de producción de papel(Universidad Santiago de Cali, 2019) Rojas Daza, Andrés Felipe; Flórez López, Edwin (Director); Grande Tovar, Carlos David (Director)In the paper industry the generation of foam is an important factor because it causes the paper to get porous structures affecting its quality. On the other hand, antifoam products are very effective in suppressing the foam generated in different processes. For this reason, two hydrocarbon and silicone-based antifoams were developed. For their characterization, physicochemical parameters such as pH, percentage of total solids, viscosity, particle size and density were determined. Fourier Transform Infrared Spectroscopy (FTIR), one of the components of the hydrocarbon-based antifoam, was also used. An experimental design was used to compare the efficiency of the hydrocarbon-based antifoam with a commercial antifoam followed by an efficiency study of the silicone-based antifoam. Finally, it was demonstrated that the hydrocarbon-based antifoam is more efficient as an antifoam and defoamer than the commercial product. Consequently, the silicone-based antifoam compound showed high efficiency at a temperature between 70 and 90 °C and a pH between 8 and 11. All these results show that these products could be used in different types of industries.Item Microencapsulación de fragancia mediante la técnica de polimerización interfacial con pared de poliurea para perfumación prolongada de textiles(Universidad Santiago de Cali, 2022) Villamil Salazar, Stefanía; Sánchez Rojas, Karen Lizeth; Flórez López, Edwin (Director); Grande Tovar, Carlos David (Director)Interfacial polymerization encapsulation is a technology that allows fragrances or any active ingredient to be incorporated into a coating that protects them from interaction with their environment. This work aimed to develop polyurea wall microcapsules with a content of 38% creamy fruit fragrance created by La Tour S.A. for application in textiles, adjusting a synthesis methodology and starting from the monomers 2,4-diisocyanate of toluene and guanidine carbonate. This in-situ polymerization results in the formation of a biodegradable wall of water-insoluble polyurea, which is synthesized from the reaction between an isocyanate group and an amino group. Using the FT-IR technique, the presence of urea functional groups in the microcapsules was verified, and the reproducibility of the methodology was demonstrated. Optical microscopy showed the spherical morphology of the capsules and a size between 0.5-1.0 μm. The results of the application of the Headspace solid phase microextraction technique (HS-SPME-CG/MS) supported by the evaluation of the trained sensory panel, demonstrated that the fragrance does not present degradation during the process, and that the encapsulation gives greater durability and intensity compared to the uncapsulated fragrance. Additionally, the cost of the synthesis carried out is favorable for the company allowing this technology to be offered at a competitive cost and with national production.