DD151195A1 - METHOD FOR THE PARTIAL MODIFICATION OF FLUID SURFACES - Google Patents

Abstract

The invention relates to a method for pattern-moderate modification of textile surface structures by irradiation with high-energy radiation and subsequent shrinking treatment. It is known to obtain a pattern at the locations of a surface area where radicals generated by the irradiation are present which react with shrinkage promoting agents. Due to the shrinkage difference to the non-shrinking points, a pattern of the surface structure is formed. According to the invention, patterning is achieved by applying shrinkage-reducing or preventing means.

Description

263/2892/111

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Process for the partial modification of fabrics

Field of application of the invention

The invention relates to a process for the partial modification of fabrics of high polymer materials, in particular textilien fabrics. Due to the partial modification, the fabrics are structured (patterned). At the same time, the fabrics can be dyed and colored differently

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advantageous clothing physiological properties are awarded.

Characteristic of the 'known technical solutions

It is known to partially modify fabrics by irradiating them by stationary or moving cover stencils with high-energy rays and treating the irradiated areas with media which induce shrinkage at the treated sites (DL-PS 81 839). Due to the shrinkage difference to the non-shrinking points, a pattern of the fabric is created.

Next ^ is known, the local irradiation through. Intensity or local control of the electron beam to achieve (DL-PS 86 086). A partial modification of the fabric can also be achieved by homogeneously irradiating the surface with energy-rich rays and then locally destroying the radicals formed by the irradiation (DT-OS 2,110,886).

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Upon subsequent treatment with certain media, the sites at which the resulting radicals could react with the medium shrink and cause a patterning of the sheet »

It is also known to apply to stiffening points of a sheet, a preparation containing a crosslinkable substance by means of a printing process and to effect a crosslinking treatment (DL-PS 125 538).

A disadvantage of these methods is that only those materials can be used which shrink during grafting.

Object of the invention .

The aim of the invention is to partially inspect fabrics.

Explanation of the essence of the invention Technical problem

The invention has for its object to solve the partial modification of fabrics in a novel way.

Features of the invention

According to the invention the object is achieved in that applied to a sheet homogeneously or locally monomeric to oligomeric, at the applied points when contacting with a shrinkage medium shrinkage of the fabric reducing substances and the fabric of a local or homogeneous, the monomeric to oligomeric substances crosslinking and / or polymerizing and / or graft-polymerizing treatment. It is advantageous to apply the substances partially and homogenihermozubehandeln the fabric or irradiate homogeneously with high-energy radiation. It is also possible to apply the substances homogeneously and to partially irradiate or partially thermo-treat the fabric and to remove the unreacted substances.

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It is likewise advantageous to use a mercerizing agent as shrinking agent in the case of fabrics made of cellulose. In the case of fabrics made of polyamide or polyester, hot air or heat-carrying media must be used as the shrinking agent.

Embodiments;

The invention will be explained in more detail below on several embodiments.

Example 1 .

Boiled and bleached cotton fabric (poplin) is padded with aqueous-alcoholic triallyl phosphate solution, squeezed to a humidity of 90% and partially spread (by templates of certain pattern) by means of a stream of accelerated electrons (dose: 1 Mrad), rinsed and rinsed dried. At the irradiated points, the formation of polymeric compounds occurs »Then, the modified fabric is treated with an aqueous solution of caustic soda (150 g / l), rinsed and dried · This causes by the action of'Alkalilauge to shrink at the points where no polymeric Connections are present.

Example 2

On boiled and bleached viscose fiber fabric, an aqueous composition containing dimethylolethyleneurea (150 g / l), an organic catalyst based on polyacid and a thickening agent is partially applied by means of printing machines; The fabric is dried and irradiated uniformly in the spread state with a stream of accelerated electrons (0.5 Mrad). Here it comes at the places where the aqueous composition was applied, to form cross-links. Subsequently, the modified fabric is treated with a soap-soda solution, rinsed and dried. In this case, the caustic solution causes the tissue shrinkage to occur where the cross-connections are missing «

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Example 3

On boiled and bleached cotton fabric (poplin) is partially applied by means of a printing machine an aqueous composition containing Diinethyloläthylenharnstoff (200 g / l), an inorganic catalyst (ammonium chloride), and a thickener; The tissue is dried in the expanded state and fixed in the heat chamber (150 ⁰ C). Cross-connections are then formed at the points where the aqueous composition was applied. Subsequently, the modified fabric is treated with an aqueous solution of caustic soda (150 g / l), rinsed and dried. This is done by exposing the alkali solution to the spots which lack cross connections, to the tissue shrink ·

Example 4 . ,

A mixture of para-formaldehyde and citric acid is printed on a flat-knit knitted fabric made of biamide silk with a surface mass of 120 g / m according to a pressure method known per se, so that 10 % (based on the polyamide composition) of formaldehyde and 2 % are printed at the printed areas. Citric acid are applied »Subsequently, the thus partially pretreated Flachkettengewirke a temperature exposure of 110 ⁰ C is subjected to an exposure time of 3 niin, whereby a crosslinking of the Flachkettengewirkes occurs at the printed areas. Subsequently, the thus partially crosslinked Flachkettengewirke is irradiated with electron beams under the scanner of an electron accelerator of known type with a dose of 5 Mrad and finally contacted for 5 min with a 20% aqueous Äkrylamidlb'sung. As a result, the Flachicettengewirke shrinks at the non-networked sites, which leads to the formation of an ornamental structure of the Flachkettengewirkes.

Claims (7)

Process for the partial modification of fabrics of high polymer materials, in particular of textile fabrics, in which monomeric to oligomeric substances are partially grafted onto the fabric and / or plymerized and / or crosslinked, characterized in that homogeneous or locally monomeric to a sheet formation oligomeric, applied at the applied sites upon contact with a shrinkage medium shrinkage of the fabric reducing substances and the fabric is subjected to a local or homogeneous, the monomeric to oligomeric substances crosslinking and / or polymerizing and / or graft polymerizing treatment. 2 · Method according to point 1 _f, characterized in that the substances are applied partially and the fabric is homogeneously treated by heat « 3 · Method according to item 1, characterized in that the sub-dopants are applied partially and the fabric is irradiated homogeneously with high-energy rays. 4 · Method according to item 1, characterized in that the substances are applied homogeneously, the fabric is partially irradiated and the unreacted substances are removed · Method according to item 1, characterized in that the substances are homogeneously applied, partially thermo-treated and the unreacted substances are removed. -5- -204668 invention sarispruch 6 · Method according to item 1, characterized in that in the case of fabrics made of cellulose, a mercerizing agent is simultaneously used as shrinkage medium. 7th method according to item 1, characterized gkennzeichnet that are used in fabrics made of polyamide or polyester as shrinkage hot air or heat-carrying media «