DE1096323B - Method of making carpets slip-resistant - Google Patents

Description

Method of making carpets slip resistant It is he common that To finish the back of carpets, rugs, etc. to give the material increased strength and to give resilience. In more recent times, carpets are also being used still non-slip.

This should prevent you from sliding in order to prevent accidents. For this purpose, you have carpet underlays made of foam, for example with a precisely defined one Surface structure provided, whereby these pads are not connected to the fabric are, or you have latex, latex foam, polyester isocyanate or as a finish film-forming plastics used. These procedures are not for several reasons satisfactory.

Plastics usually form an elastic, smooth film, which lets the textile structure of the carpet more or less shine through and which Only imperfect adhesion to the ground is achieved. Some have plastic finishes too strong adhesiveness; that's what happens when the carpets are rolled up and stored noticeable unpleasantly by damaging the pile side of the carpets. Farther With some types of finish it is disadvantageous that it occurs when the carpets are bent It is difficult to put corners back into plan form.

Polyester-isocyanate mixtures, which also make it slip-resistant Used by carpets are difficult to process because they cause condensation need a precisely measured amount of water and therefore immediately after adding water need to be processed. In addition, the carpets so treated are little abrasion resistant. When using rubber dispersions as a finishing agent the disadvantage that the impregnations become brittle with aging. The back of the carpet becomes unsightly and the rug loses its slip resistance.

Furthermore, one has in the production of so-called tufted carpets latex layers with elastic particles embedded on the back of the carpet included, applied in order to achieve a rough, elastic support layer. the uniform application of the like layers is relatively difficult, and the material consumption is great.

These disadvantages are avoided when using the finishing composition according to the invention Rubber and / or plastic dispersions converted into foam form are used. In addition to natural and synthetic materials, such finishing compounds are used to produce such finishes Rubber dispersions thermoplastic polymer dispersions in question, such as. B. Polymers of i, 3-butadiene or other conjugated dienes, such as dimethylbutadiene, Isoprene, chloroprene, also acrylonitrile, methacrylonitrile, styrene, polyvinyl chloride and polyvinyl acetate or

Copolymers made from these substances. The foam structure is thereby generated that in the plastics provided with certain additives according to the usual Methods Air or inert gases such as nitrogen, carbon Dioxide, etc. finely divided will. The air volume is usually 0.5 to 1.5 times that of the air-free Finish mass volume. Foam agents are used as additives when using thermoplastics, by which the foam formation is favored, as well as thickening agents, which improve the foam stability, into consideration.

Well-known anionic and nonionic foaming agents are suitable as foaming agents surfactants, such as. B. water-soluble salts of acidic higher molecular weight Alkyl sulfates with organic or inorganic bases, of alkyl or alkylarylsulfonic acids or of fatty acids as well as condensation products from proteins or Protein breakdown products with fatty acid or sulfonic acid halides, the known ones Polyalkylene oxide addition products, in particular ethylene oxide addition products of higher molecular weight alcohols, alkylphenols, carboxylic acids, amines and mercaptans. as Thickeners are cellulose derivatives, especially carboxymethyl cellulose or methyl cellulose, starch or starch derivatives, gelatin and glue are used.

It is also very useful to add fillers to the finishing compositions incorporate such. B. kaolin, talc, kieselguhr, silica gel, fuller's earth, clay, bentonite, Cork flour and the like. In the case of using rubber dispersions, the mixture components Vulcanizing additives are also used.

The amounts of additives used depend on the type the plastic and the type of carpet material that is being finished target. The amounts of foams are between 0.5 and 10 gll of the finishing liquor, that of thickeners approximately between 5 and 20 g / l and that of filler between 50 and 300 g / l finishing liquor. The film formers are usually in quantities from 10 to 3001ob calculated on the finish mass, applied.

The application of the finishing compound can be done by brushing on with the help of a doctor blade or a roller or done by spraying. To the carpet is placed in the stenter frame when using plastic finishes expediently subjected to drying by means of ultrared radiation, while at Use of rubber dispersions followed by vulcanization.

The advantages of the composition according to the invention are that the slip resistance the carpets compared to known processes is considerably better, although in terms of quantity less finishing compound needs to be applied per unit area. When drying the finish preserves the air bubbles inside the finish, while they burst on the surface. This creates a relatively rough "grained" Carpet back that shows particularly good adhesion and also in appearance is very appealing. The use of rubber dispersions has disadvantages which can result from signs of aging no longer matter, there they are compensated by the foam structure. The finely distributed in the finish layer Air bubbles result in a thick finish layer in terms of volume, which reduces the quality of the carpet and increased elasticity when walking on the carpet is achieved.

It is also achieved in that the accidental bending of the The edges of the carpet spring back elastically.

Examples 1. 10 g of methyl cellulose are dissolved in 1 l of water.

Then 150 g of kieselguhr are stirred in, so that a homogeneous dough is formed. 10 g of sodium alkyl sulfate (alkyl radicals C12 to Cl8, 50 ° / 0 active substance) and then 500 g of a 50% strength aqueous copolymer dispersion incorporated from styrene and butadiene. This mass is made by stirring in air brought to double the volume.

The foamy mass obtained is applied to the back of a carpet fabric applied in the desired amount. The fabric is then ultra-heated dried.

2. A solution is poured into a stirred tank with a fast-running stirrer of 10 kg of dodecylbenzenesulfonic acid Sodium (5001, ig) presented in 350 liters of water. The agitator is started, and while running are gradually 150 kg of kaolin sprinkled.

This creates a foamy dispersion in which you can 250 kg of a butadiene-styrene copolymer (50 ° / 0 butadiene) and 250 kg of a 50% aqueous chlorinated rubber dispersion incorporated. Then 16 kg of carboxymethyl cellulose are added stirred in. The carboxymethyl cellulose swells in the course of 15 to 20 minutes, and the result is a medium-viscosity, homogeneous mass that is permeated with air. It will then continue to stir until the volume of the finish mass is double the Volume of the air-free starting substances. With this mass, hair yarn runners become Finished by applying a thin layer to the back of the runner with the help of a squeegee smeared with it and the layer then dries with ultra heating.

3. One works in the same way as in Example 2, but uses instead of the chlorinated rubber dispersion, use the same amount of a mixed dispersion equal parts of a stabilized approximately 5001, own aqueous rubber latex and an approximately 50% strength aqueous, plasticizer-containing polyvinyl chloride dispersion.

The work-up and finishing is carried out as in Example 2.

Claims (1)

PATENT CLAIM: Use of a mass consisting of a dispersion of thermosetting plastics, preferably mixed with rubber, which contains foam-producing substances, thickeners and / or fillers and which by introducing air or inert gases to a larger volume is brought to the non-slip finishing of carpets. Considered publications: German Patent Specifications No. 894 236, 939 404; French Patent Nos. 1 103 974, 1 105 270; U.S. Patents No. 2,748,446, 2,752,277; British Patent No. 718,110; Revue generals you Caontehuc, 1957, pp. 869 to 873.