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Method for preparing a fire retardant additive for coatings and resulting products
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A technology of flame retardant additives and additives, applied in the direction of nanotechnology for materials and surface science, fire-resistant coatings, chemical instruments and methods, etc., to achieve the effect of controlling smoke emission
Inactive Publication Date: 2013-11-06
SERVICIOS IND PENOLES S A DE
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[0003] Most furniture is painted for aesthetic purposes and to protect the material it is made of, however most of this paint is flammable and makes an excellent flame when added to a naturally combustible base material Diffusion source
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Embodiment 1
[0061] Embodiment 1 is used for the preparation of the additive in the alkyd type coating that residual moisture content is less than 5%
[0062] 1. Separation of nano-scale magnesium hydroxide having the following particle size distribution with a moisture content of 65%: D 10 , 59.0nm; D 50 , 92.7nm; D 90 , 153 nm; measured by laser ray scattering using equipment designated COULTER LS 230. For telling purposes, we use 1200 grams.
[0063] 2. Place the magnesium hydroxide granules in a 6L container with a pour spout.
[0064] 3. Pour 3600 g of ethylene glycol butyl ether, and agitate (disperse) at a peripheral speed of 5 to 30 m / s using a dispersing propeller. This agitation (dispersion) is maintained for 5 to 15 minutes.
[0065] 4. Remove as much of the liquid fraction as possible with the help of a centrifuge, decanter, filter or other means of solid-liquid separation, depending on the capabilities of the separation equipment chosen.
[0066] 5. Repeat steps 3 and 4 ...
Embodiment 2
[0076] Example 2: Preparation of additives for use in nitrocellulose-based coatings with a residual moisture content of less than 5%
[0077] 1. Charge 490 grams of nitrocellulose into a non-spout 1.0 L Berzelius beaker.
[0078] 2. Place the beaker in a dispersing device with a diameter of 7 cm and a deflector and a propeller for dispersing.
[0079] 3. Agitate the resin at a moderate speed.
[0080] 4. Pour 10 grams of resin-compatible dispersant DCM-305 (a copolymer containing acid groups).
[0081] 5. Add 400 grams of dry magnesium hydroxide with an average particle size of 100 nm.
[0082] 6. Maintain moderate agitation until the magnesium hydroxide is completely wetted.
[0083] 7. After mixing evenly, increase the speed of the disperser until it has sufficient shear force to ensure effective dispersion: the peripheral speed is 15-30m / s.
[0084] 8. Leave to diffuse for 15 minutes or as long as needed to achieve application granularity.
[0085] The flame retardant ...
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Abstract
The present invention refers to a process for the preparation of an additive with a metallic hydroxide base, and especially of magnesium hydroxide, to be integrated in coatings with the purpose to give them higher flame retarding properties. The hydroxide has an average particle size that is selected from between 1 nanometer and 10 microns preferable with a wide variety, the magnesium hydroxide is submitted to a treatment of washing and diffusion, mainly so that they efficiently are dispersed in, and do not interfere with, the desired properties of the coating. The nature of the coating function is selected from the materials and the conditions of the treatment, as well as the size of the particle. The objective coating can have a base of water, solvents, oil, and alcohol. Compared with coatings formed with other flame retarding compositions, the additive of the invention presents less loss of weight by means of burning through ASTM D1360 standards.
Description
technical field [0001] The present invention relates to a process for the preparation of additives for coatings applied to structural elements or as finishes for combustible materials such as wood and its derivatives, in order to provide Flame retardant properties; in particular, the invention relates to the preparation of additives formulated from a mixture of metal hydroxides with a dispersant, a compatible vehicle (an organic solvent), water and a resin Easy to combine with paint. technical background [0002] It is well known that the implementation of residential buildings or other activities (work, recreation, etc.) requires measures to help control fires or slow the spread of flames. For example, some countries have enacted regulations governing the materials used in the construction of buildings, as well as regulations governing the manufacture of furniture contained in buildings. [0003] Most furniture is painted for aesthetic purposes and to protect the material...
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