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Phosphorus loaded particles and methods for their preparation and use

A particle and red phosphorus technology, applied in the field of phosphorus-loaded particles and its preparation and use, can solve the problems of limiting polymer films

Inactive Publication Date: 2014-07-02
EMPIRE TECH DEV LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the average diameter of phosphorus particles is usually greater than 100 microns, which limits the polymer film thickness, since such particles will protrude from the film thinner than the particle size

Method used

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  • Phosphorus loaded particles and methods for their preparation and use
  • Phosphorus loaded particles and methods for their preparation and use
  • Phosphorus loaded particles and methods for their preparation and use

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1A

[0115] Example 1A: Preparation of exemplary non-combustible silica particles containing nanoscale pores: silica gel with the following characteristics can be obtained: particle size of about 35 microns to 75 microns (220 mesh to 440 mesh); nanopore diameter, about 60 Angstroms; nanopore volume, about 0.8 cm3 / g; surface area, about 50 m2 / g (Sigma-Aldrich, St. Louis, MO). The silica gel can be heated to 200° C. for 10 minutes in a rotary kiln to remove adsorbed water and allowed to cool to produce dry silica gel for use in the following examples.

Embodiment 1B

[0116] Example 1B: Preparation of exemplary non-combustible alumina particles comprising nanoscale porosity: alumina with the following characteristics can be obtained: particle size of about 50 microns to 75 microns (220 mesh to 290 mesh); surface area, about 200 square meters m / g (Sigma-Aldrich, St. Louis, MO). Alumina can be heated to 200° C. for 10 minutes in a rotary kiln to remove adsorbed water and allowed to cool to produce dry alumina for use in the following examples.

Embodiment 1

[0117] Example 1C: Adsorption of white phosphorus and conversion to red phosphorus in silica: 1 gram portion of dry silica gel can be combined with 1 gram of white phosphorus in a ceramic crucible and can be heated to 50°C. The silica gel and the obtained molten white phosphorus can be stirred together with a ceramic rod, and the mixture can be heated to 300° C. for 1 hour. The mixture can be cooled to room temperature, stirred with 25 mL of carbon disulfide at about 45°C for about 10 minutes, filtered, and washed with 3 x 20 mL of boiling carbon disulfide. The mixture can be removed from the filter and the remaining solvent removed under vacuum to obtain a dry powder which can then be passed through a 220 mesh screen to remove any large unadsorbed red phosphorus particles. The result was 1.9 g of dry silica flame retardant composition powder. The silica flame retardant composition can be analyzed and can be found to have the following characteristics: weight percent red phos...

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Abstract

A flame retardant additive includes red phosphorus adsorbed into a porous carrier. The carrier may be mixed with white phosphorus above its melting point (41 DEG C), so that liquid phosphorus is pulled into the pores of the carrier by capillary action. The phosphorus-loaded carrier may be heated above 250 DEG C to convert the white phosphorus to red phosphorus. The resulting red phosphorus-loaded carrier may retain flame retardant activity, and may also be protected from the environment for easier handling and formulation. By employing a carrier of a suitably small particle size, it is practical to incorporate the flame retardant red phosphorus-loaded carrier in thin films.

Description

Background technique [0001] Unless otherwise indicated herein, the materials described in this section are not prior art to the claims in this application and are not admitted to be prior art by inclusion in this section. [0002] Phosphorus and phosphorus compounds have several characteristics that contribute to flame retardancy: high free radical quenching capacity, which confines the chemistry that allows flame spread; and char combustion products that form a char layer, which physically coats the underlying material and Protect it from burning. [0003] Adding more phosphorus to the polymer improves flame retardancy because it increases the final thickness of the phosphate char layer produced when the phosphorus burns. The concentrated form of phosphorus is red phosphorus, but it can be very difficult to form a granular powder for mixing with polymers, and it releases toxic phosphine gas when it comes in contact with moisture. Phosphorus, for example, has been used in tw...

Claims

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Application Information

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IPC IPC(8): C09K21/04C08K9/12
CPCC08J3/212C08K3/0058C08K3/016
Inventor S·A·米勒
Owner EMPIRE TECH DEV LLC
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