DE102008007759B4 - Agent for preventing discoloration when washing textiles - Google Patents

Abstract

Composition for preventing discoloration and graying during washing of textiles by means of a dye-binding substrate based on cationized cellulose, the composition comprising a reusable container having an opening and closing closure, the container containing the cationized substrate and the container Having passages for the passage of washing liquid, characterized in that the substrate is in the form of staple fibers or Cordfadenabschnitten.

Description

The The invention relates to a means for preventing discoloration and graying when washing textiles, which is a substrate contains a substrate that comes out of the wash baths free-flowing dyes and a method for producing such substrates.

The Problem of discoloration of textiles when washing, be it in the household at hand washing or in washing machines or in larger washing machines in commercial Company or industry, has long been known.

Caused When washing textiles, discolorations are caused by the fact that dyed textiles are used in the washing of textiles Wash dyes in the wash water, wash bath or wash liquor and then freely available in the wash liquor freely available Dyes settle on other textiles and so not only in white unstained Textiles to the dreaded discoloration to lead but also shades of light colored Change textiles, be it that a delicate shade of a more colored hue turns or even the coloring as such changes becomes.

This Phenomenon, that's not just the scare for every housewife is also at washing and in commercial and industrial scale as a big one Disadvantage is felt, especially occurs when dyed laundry is not dyed colorfast is and the colors tend to bleed. But even more valuable Textiles leaves It is not always avoid that the dye is made of dyed fabric triggers and roamed freely in the wash water.

Often tried one this unpleasant phenomenon Dodge that by sorting the laundry by color and White wash washes for itself and If possible, wash with the same color washed separately. Such a procedure is natural laborious, labor intensive and many cases also not to perform. On the other hand, efforts have been made To develop means that are added to the laundry and which the To absorb vaginal dyes, before they on the to washing textiles can cause damage.

In the US 4,582,917 A describes a process in which salts of new derivatives of N-oxirane methane-N, N, N-trialkylammonium are prepared. These substances are used to give textile material permanent bacteriostatic and / or antifungal properties.

In the US Pat. No. 4,615,709 cationic compounds and their preparation are described, which are to serve for the treatment of textile material in order to give this an improved staining.

In the US 4 380 453 A there is described an agent intended to function as a dye scavenger and consisting of a cellulosic substrate which has been catonized by treatment with a quaternary ammonium compound such as glycidyltrimethylammonium chloride or corresponding halohydroxy compounds and which is intended to remove the free-roaming dyes from the wash water. The substrate is added to the wash liquor and can be in various forms, for. As fabrics, nonwovens, braided ropes or balls etc.

From Disadvantage of this method is u. a. that it is often difficult to remove these substrates after washing from the laundry. Furthermore to lead such additives often to tangles or to tangle of laundry. It has also been found that z. B. the tissues specified there for the repeated use are not particularly suitable.

That's why there have been quite a few advancements. So be in the DE 697 10 724 T2 Methods are described, with which an improved substrate is to be obtained. The process described therein consists of a whole series of process steps such as ammonification of the cellulose substrate, treatment thereof under a pressure of 0.6 to 1.37 MPa, heating the substrate to a temperature between 30 ° C and 40 ° C, wrapping the substrate in a water-impermeable material and rotating the material at temperatures between 15 and 100 ° C for a period of between 1 and 12 hours, removing the enclosure, passing the substrate through an acid bath, further pressure treatment and drying of the substrate.

These Procedural steps are very labor intensive and lead last Not a significant improvement.

In US 2002/0119721 A1 and US 2006/0019564 A1 Further substrates for the removal of dyes from the wash liquor are described, which consist of two or more layers and are added to the laundry. In this case, the dye-absorbing compounds may be applied to individual surfaces of the layers or on multiple surfaces. But even these embodiments do not bring any significant reductions in the disadvantages described above.

Another attempt to remove the free flowing dyes in the wash bath is in the WO 99/63142 A1 described. It is primarily the goal of the development described there to reduce the entanglement of the substrates with the laundry. In this case, the means described there have floating bodies or additionally also edge reinforcements. For example, the dye-receiving bodies may be in the form of a continuous ring placed on top of the stirrer, or they may be floated or they may be in the form of a hollow ball having some larger openings for the free passage of wash liquor and attached to the washing machine via a rope and a clamp.

apart that the procedures described there are cumbersome, can be complicated and expensive These devices are used only once or a few times and have to then be discarded.

Even though Already numerous means are known to be free-roaming Dyes during the To absorb and remove the washing process still exists a need for improved remedies that are suitable for the free vagabond Dye during to remove the washing process and prevent it during the Washing a discoloration of laundry takes place.

task It is the object of the invention to provide a composition which is as above does not have mentioned disadvantages that is easy to manufacture and its production is not as labor intensive as many of them well-known means that are simple in its application to a large extent can be reused as often as you like during the washing process to connect and felting leads and after washing easily separated from the washed laundry can be and in its production you also on inexpensive, namely cheap starting materials We can refer to waste materials and minor varieties that are used in production of textile products such as fibers, filaments, yarns, textile fabrics and the like, and incidentally without difficulty in the household at the hand wash and in washing machines, commercial laundries and industrial scale can be used.

These Task is solved by a means for preventing discoloration and graying when Washing fabrics by means of a dye-binding substrate, based on cationized cellulose, wherein the agent one again suitable container includes, one for opening and closing the container has the cationized substrate contains and the container passages for passage of washing liquid, characterized in that the substrate is in the form of staple fibers or cord sections.

Preferably have the passages a diameter of 0.01 to 1 mm. Incidentally, the diameter can be up the substrate can be tuned.

Of the Closure is preferably a zipper, a velcro, a zipper or snap closure. It is also possible, in particular in flexible containers like bags, bags and the like from woven, knitted, braided, etc. sealing by to cause easy attachment, z. B. with a string, a rope Etc.

It is advantageous if the container a bag-shaped shape having. It is advantageous if the container is at most half maximum, preferably up to a quarter of its fill volume filled with substrate is.

In a particularly advantageous embodiment of the invention formed the substrate in tablet form.

The Substrate is constructed on the basis of staple fibers or Cordabschnitten. The Cordabschnitte preferably have a length of 1 to 5 cm.

It is advantageous if the substrate next to the cationized polymer 0.2 to 2 wt .-% of a binder. The binder may, for. B. Carboxylmethylcellulose, starch or the like.

The Substrate may also be advantageous from a mixture of cationized Pulp and cationized cellulose fibers in particular also constructed staple fibers be.

In a particularly advantageous embodiment of the invention the substrate is built on the basis of fiber waste and minor species, but also pieces of waste, Complaint parts of textile surface products.

The Substrate can also be cotton fibers mixed with cellulose fibers, d. H. Comprising regenerated cellulose fibers. Under fibers Regenerated cellulose is to be understood in particular as fibers, which are prepared in a known manner by the viscose process. But there are also suitable fibers, after the Cupraminprozess getting produced.

Another object of the invention is a method for producing a cationized substrate, which is characterized in that Cellulose staple fibers optionally cationized in admixture with pulp, washed with water and optionally pressed with the addition of a binder to plates, the plates are dried and punched out after drying to tablet-shaped moldings.

In Variation of this method is the mushy cationic mixture of cellulose staple fibers, pulp and optionally binder on a Punched sheet painted, in which the holes a round or square Have shape. The mushy mixture is still in the perforated plate drained and dried and the tablets removed the tablets in tablet form.

The In general terms, the invention can be carried out in the following way.

It will be first a body, the cellulosic material or other suitable polymer with hydroxyl groups, cationized.

The cationization of such substrates is known per se. It is in this context in particular on the US Pat. No. 4,380,453 , the US 2 002/0119 721 A1 and US 2 006/0019564 A1 , the WO 99/63142 A1 referenced, to which numerous examples for the cationization of corresponding substrates are described. The relevant disclosure in these documents is hereby incorporated by reference.

Within the scope of the invention, the substrates may be present, inter alia, in the following form:
As textile fabrics such as fabrics, cloths, knitted fabrics, as nonwovens, as sections of cords, as staple fibers, as pulp, which is preferably obtained from linters, in the form of granules, as cubes, as spheres but especially in the form of tablets.

These cationized shaped body are then in the open container given, which is then closed by means of the closure. The container can z. B. be made of woven or knitted fabrics and are with a appropriate closure provided, or can also be easily tied become.

The Size and that Volume of containers can in wide limits are varied and on the local washing conditions be adjusted. So are containers, the size of a Washcloth or a handkerchief have very suitable since she herself while the washing process like a piece of laundry, However, due to structural reasons, they tend not to get entangled.

It is generally sufficient that the container to a quarter to the half filled with the cationized substrate.

Consists the substrate being filled into the container is said to be made from blends of cellulosic staple fibers and pulp and possibly a binder, so the container should not exceed to 50% of its capacity, preferably only to a quarter of its capacity with filled the substrate be as the substrate during the washing swells and expands at the same time. This achieves this Substrate a particularly large active surface.

The container preferably have openings with a diameter between 0.01 to 1 mm. This opening size can be achieved very easily, for. B. if the container for example from a Fabric material by adjusting the warp and weft density. Accordingly, you can set the mesh density accordingly in knitted fabrics, that these values for the openings be achieved.

at these openings The washing water can still flow very well through the container and into the substrate Come in contact. On the other hand, the substrate is prevented from doing so to emerge from the container and the laundry to pollute.

To the washing process leaves the container without difficulty separate from the laundry, since it is very recognizable is and is not in the wash entangled.

ever according to intensity the free-floating vaginal in the wash bath dye molecules can the container with a filling be used several times.

Otherwise it is very simple the container to open and withdraw the spent substrate from the container or through turn upside down to empty the container can then be refilled immediately become.

Especially the invention is advantageous in that so-called minor varieties of threads and fibers, but also be used by textile surface products can.

such Minor varieties always fall in the production of fibers and threads, yarns and cords and also in the production of textile surface products at.

Minor grades of staple fibers may be used directly or, eventually, subjected to a comminution process. Threads and yarns can be cut or torn, cord yarns and other plied yarns are convenient to cut to shorter length before preferably at lengths of about 0.5 to 5 cm.

There according to the invention cheap waste materials can be used, the invention has a large cost and price advantage over the known methods or means. The containers are very easy to manufacture and need No additional Reinforcements. For the Substrates can too textile waste products are used in the form of textile fabrics. These just need to be cut to an appropriate size, to put them in the respective container in fit.

The container can be used as often as you like.

One Another advantage of the agent according to the invention is that the active substrates have no direct direct contact with the Have laundry and thus there is no danger that by a direct close contact also interactions with the person to be washed Good performance. So is a direct immediate dye transition, be it from the material to be washed to the substrate or vice versa, avoided. The agent according to the invention thus absorbs only the dye molecules in the wash liquor roam freely.

The Invention is explained in more detail by the following example.

example

In a beaker is 50 g of pulp and 50 g to 1.5 cm short cut viscose fibers with a freshly prepared cationization solution. The cationization solution was prepared from 27.55 g of 33% sodium hydroxide solution, 190.85 g of water and 31.60 g of a 65% solution of 3-chloro-2-hydroxypropyltrimethylammonium chloride. The mixture of pulp, viscose fibers and cationizing solution becomes then strong for a few minutes kneaded and then closed in a jar and allowed to stand at room temperature for 24 hours. After that, 4 times with Washed 2.5 liters of water. After drying, 100 g a 1% carboxymethylcellulose solution (CMC solution) and another 100 g of water added.

The mashy, dripping wet mass will now be in a rectangular mold given and evenly distributed. Subsequently In a hand press, the mass is reduced to a layer thickness of approx. 1 cm, the water content is then still about 50%. To drying out of the plate tablets of a diameter punched out of 3.5 cm. Weigh this tablet-like shaped body about 3 g and can needed immediately.

The inventive agent From a wash liquor absorbs the free-flowing dye very well and is in many ways the commercial color and Superior to mudflaps.

Claims (16)

Composition for preventing discoloration and graying during washing of textiles by means of a dye-binding substrate based on cationized cellulose, the composition comprising a reusable container having an opening and closing closure, the container containing the cationized substrate and the container Having passages for the passage of washing liquid, characterized in that the substrate is in the form of staple fibers or Cordfadenabschnitten. Means according to claim 1, characterized in that the passages a diameter of 0.01-1 mm have. Agent according to claim 1 or 2, characterized that the closure is a zipper, a Velcro, a snap fastener or a zipper is or bound the container is. Agent according to at least one of claims 1-3, characterized characterized in that the container a bag-shaped shape having. Agent according to at least one of claims 1-4, characterized characterized in that the container maximum half preferably at most up to a quarter of its fill volume filled with substrate is. Agent according to at least one of claims 1-5, characterized characterized in that the substrate is formed in tablet form and the substrate 0.5-2% by weight containing a binder. Agent according to at least one of claims 1-6, characterized characterized in that the Cordabschnitte have a length of 0.5-5 cm. Agent according to at least one of claims 1-7, characterized characterized in that the substrate is made of a mixture of cationized Pulp and cationized cellulose staple fibers is constructed. Agent according to at least one of claims 1-8, characterized characterized in that the substrate constructed from fiber waste and minor varieties is. Agent according to at least one of claims 1-9, characterized characterized in that the substrate consists of a mixture of staple fibers made of regenerated cellulose and cotton fibers. Agent according to at least one of claims 1 to 10, characterized in that the staple fibers and the cord filament sections are produced by the viscose process. Method for producing a cationized substrate, characterized in that cationized cellulose staple fibers, washes with water and with the addition of a binder pressed into plates, the plates dries and punched out after drying to tablet-shaped moldings. Method according to claim 12, characterized in that that the cellulase staple fibers are cationized in admixture with pulp. Method for producing a cationized substrate, characterized in that cationized cellulose staple fibers, washes with water and with the addition of a binder as a slurry on a perforated plate deletes the holes have a round or angular shape, the mushy mixture still drained in perforated sheet metal and dries and the sheet takes the tablets in tablet form. Method according to claim 14, characterized in that that the cellulase staple fibers are cationized in admixture with pulp. Agent according to one of claims 1 to 11, characterized that the substrate is in the form of granules, cubes, spheres.