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Flame retardant prepared from amide derivatives and process for making the same

A technology of derivatives and mixtures, applied in the field of flame retardants prepared from amide derivatives and their manufacture, can solve the problems of unwanted moisture/moisture absorption, loss of flame retardant properties, etc.

Active Publication Date: 2016-04-13
RHODIA OPERATIONS SAS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Furthermore, it was found that many of the known phosphonate HFFR additives have a tendency to migrate and / or volatilize from thermoplastics over time, or to decompose at different thermoplastic processing temperatures (in particular, extrusion processing temperatures), causing the system to suffer from a gradual loss of flame retardant properties
Additionally, these existing phosphonate HFFR additives are also known for their hygroscopic properties which will eventually lead to unwanted moisture / humidity absorption

Method used

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  • Flame retardant prepared from amide derivatives and process for making the same
  • Flame retardant prepared from amide derivatives and process for making the same
  • Flame retardant prepared from amide derivatives and process for making the same

Examples

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example 1

[0074] With stirring, 78 g of H 3 PO 3 Add 70.86g of Ca(OH) 2 and 400g of H 2 O mixture. Subsequently, the resulting mixture was stirred at 40° C. for 2.5 h, and then filtered to obtain a solid mixture containing calcium phosphite. The solid mixture was washed with deionized water and dried at 105 °C for 3 h.

[0075] A 250 mL reactor equipped with a mechanical stirrer was charged with 120 g of water and 30.46 g of the calcium phosphite mixture obtained as mentioned above. Under stirring, 53.3 g of an 85% orthophosphoric acid hydrochloric acid solution were added to the resulting mixture at room temperature. After the addition, the mixture was stirred for half an hour and then filtered to remove insoluble solids to give a clear solution. Then 58 g of melamine were slowly added to the filtrate under stirring for another 1 hour of reaction. After this time, the mixture was evaporated to remove all water to obtain a white solid. The white solid was heated at 330° C. for 3 h...

example 2

[0080] A 500 mL reactor equipped with a mechanical stirrer was charged with 400 g of water and 60 g of calcium phosphite mixture. Under stirring, 91.34 g of a 38% hydrochloric acid solution were added to the resulting mixture at room temperature. After the addition, the mixture was stirred for half an hour and then filtered to remove insoluble solids to give a clear solution. Then 144 g of melamine were slowly added to the filtrate with stirring for another 1 hour of reaction. After this time, the reaction mixture was filtered to remove the aqueous solution and a white solid was obtained. This white solid was then heated at 330° C. for 3 hours (with a weight loss of 23%) to convert it to the calcium melamine phosphate salt. By elemental analysis, the calcium melamine phosphate salt thus obtained contained 41.55% of N, 7.27% of P and 7.98% of Ca. By calculation, the percentage of oxygen element remaining in the calcium melamine phosphate salt is 23.67% by weight. Therefore,...

example 3

[0083] A 500 mL reactor equipped with a mechanical stirrer was charged with 400 g of water and 65.5 g of calcium phosphite mixture. Under stirring, 91.34 g of a 38% hydrochloric acid solution were added to the resulting mixture at room temperature. After the addition, the mixture was stirred for half an hour and then filtered to remove insoluble solids to give a clear solution. Then 144 g of melamine were slowly added to the filtrate with stirring for another hour of reaction. After this time, the mixture was filtered to remove the aqueous solution to obtain a white solid. This white solid was heated at 330°C for 3 hours to yield calcium melamine phosphate salt with 23% weight loss during heating. The calcium melamine phosphate salt thus obtained contained 31.5% of N, 16.0% of C, 2.60% of H, 14.2% of P and 7.98% of Ca by elemental analysis. By calculation, the percentage of oxygen element remaining in the calcium melamine phosphate salt is 27.72% by weight. Thus, based on ...

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PUM

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Abstract

A method for manufacturing a melamine derivative mixture, comprising: firstly, reacting at least a nitrogen containing compound and a metallic phosphite or hydrogen phosphite salt in an aqueous solution; and secondly, heating the resultant reaction mixture in solid form, at a temperature comprised between 150-500 DEG C in the presence of an oxidant, to obtain a melamine derivative mixture. The thus obtained melamine derivative mixture is found to be useful as a flame retardant in epoxy polymers and help retain their physical properties.

Description

[0001] Cross References to Related Applications [0002] This application claims priority to PCT International Application No. PCT / CN2013 / 082132 filed on August 23, 2013, the entire contents of which are hereby incorporated by reference. technical field [0003] The present invention relates to a method for producing a mixture of melamine derivatives by reaction between at least one amide derivative and a metal phosphite, and to the use of said reaction for the production of flame retardants. Background technique [0004] Flame retardants are additives used in plastics and other industrial products to suppress or resist the spread of fire. In recent years, industrial applications of halogen-free flame retardants have attracted much research attention due to the environmental advantages brought about by limited halogen levels. A commonly used halogen-free flame retardant (HFFR) is phosphonate HFFR, such as melamine pyrophosphate (MPP), which is widely used in thermoplastics ...

Claims

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Application Information

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IPC IPC(8): C08K5/51
Inventor 李俊力G.伍德沃德
Owner RHODIA OPERATIONS SAS
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