Method for producing flame-resistant, non-corrosive and stable polyamide moulding compounds

Abstract

The invention relates to a method for producing flame-resistant, non-corrosive and stable polyamide moulding compounds. The aim of the invention is to use a mixture of several components as non-corrosive flame retardants. Said mixture comprises, as component A) 20 - 98 wt.% of a dialkylphosphinic acid salt of formula (I) (as shown in the description) and/or a diphosphinic acid salt of formula (II) (as shown in the description) and/or polymers thereof, wherein R1, R2 are the same or different and C1 -C6-alkyl are linear or branched; R3 represents C1-C10-alkylene, linear or branched, C6-C10-arylene, C7-C20-alkylarylene or C7-C20-arylalkylene; M represents Mg, Ca, Al, Sb, Sn, Ge, Ti, Zn, Fe, Zr, Ce, Bi, Sr, Mn, Li, Na, K and/or a protonated nitrogen base; m is 1 - 4; n is 1 - 4; x is 1 - 4, as component B) 1 - 80 wt.% of a salt of the phosphoric acid, having general formula (III) [HP(=O)O2]2-M m+, wherein M represents Mg, Ca, Al, Sb, Sn, Ge, Ti, Zn, Fe, Zr, Ce, Bi, Sr, Mn, Li, Na and/or K, as component C) 0.1 - 30 wt.% of an inorganic zinc compound, as component D) 0 - 30 wt.-% of a nitrogen-containing synergist and/or a phosphorous/nitrogen flame retardant, as component E) 0 - 3 wt.% of a phosphonite or a mixture of a phosphonite and a phosphite and as component F) 0 - 3 wt.-% of an ester or salt of long-chained aliphatic carboxylic acids (fatty acids), which comprise the typical chain lengths of C14 - C40, the total of the components always amounting to 100 wt.%.

Description

technical field [0001] The present invention relates to a process for preparing flame-retardant, non-corrosive and stable polyamide molding compositions, and to the compositions themselves. Background technique [0002] Especially for thermoplastic polymers, salts of phosphinic acid (phosphinates) have proven to be effective flame-retardant additives (DE-A-2252258 and DE-A-2447727). Calcium and aluminum phosphinates have been described as being particularly effective in polyesters with regard to their activity and have less adverse effects on the material properties of polymer molding compositions than, for example, alkali metal salts ( EP-A-0699708). In addition, it has been found that synergistic combinations of phosphinates with certain nitrogen-containing compounds act more effectively as flame retardants across the polymer family than said phosphinates alone (PCT / EP97 / 01664 and DE-A-19734437 and DE-A-19737727). [0003] DE-A-19614424 describes phosphinates in combin...

AI Technical Summary

Problems solved by technology

Corrosion and/or wear caused by flame retardants can

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