DE3005477A1 - Fire retardant additive for polyurethane integral foam - comprising a mixt. of penta:bromo-di:phenyl ether etc. with chloro:paraffin and/or an alkyl or aryl phosphate - Google Patents

Abstract

Fire retardant additive for polyurethane integral foams comprises a mixt. of (a) pentabromodiphenylether (I) and/or hexabromocyclododecane (II) and/or tetrabromobisphenol A (III) and/or tetrabromobisphenol A-bis-(dibromopropylether) (IV) and (b) a chlorinated paraffin (V) and/or an alkyl-, aryl- or alkylaryl phosphoric acid ester or mixts. of these (VI). The combination (a)+(b) gives integral polyurethane foam mouldings with a burning classification of UL 94 class V-O or DIN 4102 class B2 or B1. The mouldings are useful, e.g. in the prodn. of television receiver cabinets, electrical equipment housings, window frames, furniture, etc.

Description

Fire-protected integral polyurethane foams Molded parts made of integral foams are plastic bodies with an inhomogeneous density distribution. They have a foam core that is continuous into a compact outer layer merges from the same plastic. This allows thick-walled, solid and produce lightweight molded parts.

For many purposes of such components it is desirable or it is required that they are fire-protected. This is for example the case with electrical appliances, such as housings for television receivers, or in construction for window frames or in furniture construction.

Such integral foams must then according to the fire standard UL 94 of the class V-0 or according to DIN 4102 class B 2 or B 1.

So the task was given, one for polyurethane integral foams to find suitable fire protection preparations that provide adequate fire protection without reducing the strength of the integral foam molded parts.

The invention accordingly relates to the use of a mixture made of organic bromine compounds and chlorinated paraffins or phosphoric acid esters by a mixture of: a) pentabromodiphenyl ether and / or hexabromocyclododecane and / or Tetrabromobisphenol A and / or tetrabromobisphenol A-bis- (dibromopropyl ether) and b) a chloroparaffin and / or an aryl or alkyl phosphate or an alkyl aryl phosphate or mixtures of the named compound classes, as fire protection equipment for polyurethane integral foams.

Since the preparation according to the invention has to be made fire-resistant Integral foams preferably injection-molded from the liquid components of the polyurethane it is necessary that the fire retardants in the polyol or in the isocyanate can be solved.

A chlorinated paraffin is therefore used to produce the fire protection preparation with 30 to 70 wt .-% chlorine or a phosphoric acid ester, for example triethyl phosphate, Trioctyl phosphate, triphenyl phosphate, triaryl phosphate, diphenyl hexal phosphate, phenyl dihexyl phosphate, Mixtures of trioctyl phosphate / tricresyl phosphate at a temperature of 90 to 1400C warmed up. In the warm liquid or

One or more of those mentioned under a) are then melted dissolved brominated aromatic compounds.

The amount of such introduced into the fire retardant preparation Components are: Pentabromodiphenyl ether 20 to 70 wt .-% hexabromocyclododecane 15 to 30% by weight tetrabromobisphenol A 20 to 50% by weight tetrabromobisphenol A.

bis (dibromopropyl ether) 15 to 45% by weight chlorinated paraffin 25 to 50 % By weight of alkylaryl phosphate 15 to 45% by weight in each case based on the total weight the preparation.

This preparation is then, depending on the raw materials used of the polyurethane, in the polyol or isocyanate component, but predominantly dissolved in polyol. The amounts are 8 to 40 parts by weight of fire retardant preparation on polyol.

The two polyurethane components with other common additives, such as, for example, activators, accelerators, foam stabilizers, anti-aging agents etc. are injected into molds in a manner known per se, where they form an integral foam foam and cure to form the desired molded part.

A few examples of the composition and properties of integral skin foams according to the invention are given below: Table I: Fire retardant preparations Parts by weight ABCDEF Pentabromodiphenyl ether 50 55 50 Hexabromocyclododecane 20 25 25 - 25 20 Tetrabromobisphenol A 35 30 Tetrabromobisphenol A- bis- (dibromopropyl ether) 30 Chlorinated paraffin 50 30 - 45 45 Diphenylhexyl phosphate 20 40 20 35 Table II: Composition and properties of integral skin foams Parts by weight 1 2 3 4 5 6 7 Polyol 100 100 100 100 100 100 100 Activator 1 1 1 1 1 1 1 Stabilizer 1 1 1 1 1 1 1 Isocyanate 120 120 120 120 120 120 120 Formulation A 12 B 12 c 10 D 9 E 9 14 F 14 Fire behavior according to UL 94 Class HB V-0 V-0 V-0 V-0 V-0 V-0 Fire behavior according to DIN 4102 Class B3 B-2 B-2 B2 B2 B-2 B-2 Bending strength according to DIN 53 452 N / mm² 1050 980 95C 930 980 94G 950 Compared to sample 1, which corresponds to the integral polyurethane foam used in all samples without fire protection equipment, all other samples equipped according to the invention show a significantly improved fire behavior with only slightly changed flexural strength.

Claims (1)

Claim Use of a mixture of organic bromine compounds and chlorinated paraffins and / or phosphoric acid esters, characterized by a mixture from: a) pentabromodiphenyl ether and / or hexabromocyclododecane and / or tetrabromobisphenol A and / or tetrabromobisphenol A-bis - (dibromoprapyl ether) and b) a chlorinated paraffin c) an alkylaryl or alkylaryl phosphoric acid ester or mixtures thereof for fire protection equipment for polyurethane integral foams