DE1189516B - Process for producing flame-retardant fiber mats - Google Patents

Description

GERMAN

PATENT OFFICE

EDITORIAL

German class: 8 k-4

Number: File number: Registration date: Display day:

1189 516 F31795IVc / 8k July 29, 1960
March 25, 1965

It is known to produce fiber mats up to a specific gravity of 0.01 by treating Acetate fibers with plasticizers and then carding and drying in a heating tunnel Take advantage of the tackiness of the acetate fibers without additional binders.

Because of the low specific weight, such fiber mats are easily combustible and therefore as Air filter not very suitable.

It is also known to use chlorine-containing plasticizers, e.g. B. trichloroethyl phosphate to use. You get so although difficult or non-flammable fiber mats, however, the production with large technical Difficulties are associated, as these plasticizers already dissolve fibers in the cold and thus make continuous carding impossible. Besides, most of it must of the plasticizer are retained in the fibers, which in turn leads to a strong reduction in the Melting point of the fibers leads, so that such mats do not burn or burn hard, but in Contact with fire can melt and cause burns.

Non-combustible fiber mats can also be made by using non-combustible plasticizable ones Fibers, e.g. B. made of polyvinyl chloride, etc., produce. When the fibers become sticky At the same time, the fibers shrink because of the high temperature, so that it is not possible is to get dimensionally accurate products.

An admixture of such non-flammable fibers with acetate fibers is necessary until the shape is retained but only possible in an amount that is too small to obtain a non-combustible fiber mat.

It has now been found that one obtains non-combustible dimensionally stable fiber mats when one Fiber mixture

1. 10 to 70 percent by weight plasticizable, chlorine-containing, non-combustible fibers and

2. 90 to 30 weight percent combustible fibers

so treated with a Sb ₂ O ₃ -containing, at room temperature ineffective plasticizer, such as benzenesulfonic acid butyl amide, that the total amount absorbed is about 5 to 20%, based on the fiber weight, then carded and this still unconsolidated fiber mat a heat treatment subject.

During the heat treatment in the heat channel, most of the plasticizer then evaporates again, so that a relative Sb ₂ O ₃ accumulation on the surface or on those adjacent to the surface.

Method of making heavy
combustible fiber mats

Applicant:

Carl Freudenberg,

Weinheim (a. D. Bergstrasse)

Named as inventor:
Dr. Robert Cockroaches,
Weinheim (ad Bergstrasse)

ao exposed parts of the fiber enters. You can also completely evaporate the plasticizer without thereby impairing the non-combustibility. In this case there is also no lowering of the melting point the fibers instead, which leads to the annoying dripping when touching an open flame.

A solvent can be added to lower the viscosity of the Sb ₂ O _{3 -containing plasticizer.}

example 1

A fiber fleece, consisting of 80% diacetate fibers, 3 den, and 20% polyvinyl chloride fibers, 3 den, is with 70 parts of benzenesulfonic acid butyl amide and 30 parts of antimony trioxide so impregnated that 10% of this mixture is applied to the fiber mixture will.

The fibers impregnated in this way are stable on storage. They are carded to a fleece of 300 g / m ² and solidified in a heat tunnel at 120 ° C. A non-combustible mat with a specific weight of 0.015 is obtained.

Example 2

A fiber fleece, consisting of 75 parts of diacetate fibers, 28 den, and 25 parts of a mixed polymer fiber, 5 den, consisting of 60% vinyl chloride and 40% acrylonitrile, are impregnated with the plasticizer and antimony trioxide mentioned in Example 1, to form a fleece of 200 g / m ² laid and then solidified as in Example 1. A very loose, very porous fiber mat with a specific weight of 0.012 is obtained.

509 520/405

Claims (4)

Claims:. 1. A process for the production of flame- retardant fiber mats, characterized in that there is a mixture of 1. 10 to 70 percent by weight plasticizable, chlorine-containing, non-combustible fibers and 2. 90 to 30 weight percent combustible fibers Impregnated with a _{plasticizer containing Sb 2} O _s , inactive at room temperature , such as benzene sulfonic acid butyl amide , in such a way that the total amount absorbed is 5 to 20%, based on the fiber weight, then carded and this still unconsolidated Subjected fiber mat to a heat treatment. 2. The method according to claim 1, characterized in that as plasticizable, chlorine-containing, non-combustible fibers PVC fibers are used. 3. The method according to claim 1, characterized in that as plasticizable, chlorine-containing, non-combustible fibers mixed polymer fibers, consisting of 60% polyvinyl chloride and 40% acrylonitrile can be used. 4. The method according to claim 1, characterized in that the combustible fibers are acetate fibers be used.