Blends of encapsulated biocides
A biocide and microencapsulation technology, applied in the field of free biocide and encapsulated DCOIT, marine anti-pollution coatings and coatings, can solve the problem of limited initial control of polluting microorganisms, low rate of biocide release, Issues such as low initial concentration of free biocides
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Embodiment 1
[0041] Microencapsulation of DCOIT with solvent diluent
[0042] An aqueous phase was prepared consisting of: 160 grams each of 5% strength (strength) PVA in water, (Vinol from AirProducts TM 540 and Vinol TM 125) and 300 grams of water. The aqueous phase was heated to 40°C.
[0043] A core material was prepared as a mixture of 100 g of DCOIT (97%) and 100 g of a substituted aromatic solvent SAS310 (manufactured by Nisseki Chemical), and the mixture was heated to 40°C. The aqueous phase and core material were added to a 1 quart Waring Blender jar and the resulting slurry was emulsified at medium speed for about 15 minutes to produce an oil-in-water emulsion with droplet sizes in the range of about 10-40 microns. Transfer this emulsion to a 1 liter beaker. The slurry was slowly agitated with the impeller of the impeller while maintaining the temperature at about 40°C. A solution of 4 grams of urea and 10 grams of resorcinol in 60 grams of water was slowly added to the emul...
Embodiment 2
[0045] Microencapsulation of pure DCOIT biocide
[0046]Microencapsulation of pure DCOIT was performed in a continuous aqueous phase, resulting in microcapsules containing amino-formaldehyde shells. An aqueous phase was prepared consisting of 27.5 grams of a 3.75% ethylene maleic anhydride copolymer (manufactured by Zeelan Chemical Company) solution and 30.37 grams of water, heated to 45°C. In another vessel, 32.5 grams of DCOIT (97%) was added and heated to 45°C to form a liquid melt. Emulsions were prepared as follows: The molten DCOIT core material was dispersed in the aqueous phase using an Ika-Works stirrer bar and a high speed vortex, where the vortex speed was controlled to produce DCOIT droplets mostly in the range of 10-50 μm. While maintaining the temperature at 45°C during the emulsification process, 5.58 g of Cymel 385 produced by Cytec was added to stabilize the emulsion. After about 15 minutes, the stirring speed was reduced and an additional 1.79 grams of Cyme...
Embodiment 3A
[0048] DCOIT microcapsules with double shells of acrylic acid and PVA-urea-resorcinol-glutaraldehyde
[0049] The internal phase was prepared by mixing: DCOIT (150 g), methyl methacrylate (10 g), butanediol 1,4-diacrylate (10 g) and trimethylolpropane trimethylol, molten at about 50°C Acrylate (10g). Immediately before emulsification, terbutyl perpivalate (1 g) was mixed into the above internal phase. Homogenize the internal phase into a mixture containing PVA (Elvanol produced by DuPont) within 10 minutes with a Waring 1 liter blender. TM 50-42) (6g) in water (254g) until a stable emulsion formed. The emulsion was then transferred to a 1 liter beaker with overhead stirring, calorimetry and nitrogen supply and deoxygenated with nitrogen for 1 hour while heating to 90°C. After removal of nitrogen, the emulsion was maintained at 90°C for 1.5 hours and then cooled to 45°C. The resulting emulsion contained polymer particles each containing a polymer shell encapsulating DCOIT w...
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