KR100910989B1 - Method for treating cellulosic moulded bodies - Google Patents

Abstract

FIELD OF THE INVENTION The present invention relates to a method for treating cellulose-based molded bodies, especially fibers, prepared from cellulose solutions in aqueous tertiary amine oxides, the method comprising the step of contacting the molded bodies with fabric preparations. The process according to the invention is characterized in that the fabric preparation comprises cyclodextrins and / or cyclodextrin derivatives.

Cellulose-based molded body, cyclodextrin, solvent radial fiber, fabric preparation, crosslinking agent, fiber assembly

Description

Processing method of cellulose molded body {METHOD FOR TREATING CELLULOSIC MOULDED BODIES}

FIELD OF THE INVENTION The present invention relates to a process for the treatment of cellulosic shaped bodies, in particular fibers and assemblies containing these fibers, prepared from cellulose solutions in aqueous tertiary amine oxides, in which the shaped bodies are provided for imparting improved properties to the shaped bodies. Is contacted with a textile auxiliary agent.

The meaning of the term "molded body" in the present invention includes in particular a sponge.

As an alternative to the viscose process, several methods have recently been proposed for dissolving cellulose in organic solvents, mixtures of organic and inorganic salts, or brine without forming derivatives. Cellulose fibers made from such solutions are called "solvent-spun fibers" and are lyocelled by the International Bureau for the Standardization of man made Fibers (BISFA). The generic name was given. BISFA, by the name of lyocells, defines cellulose fibers obtained by spinning processes from organic solvents. For "organic solvent" BISFA is understood to be a mixture of organic compounds and water, and "solvent-spinning" is considered to mean dissolution and spinning without derivative formation.

However, to date, only one method has been realized on an industrial scale for producing solvent-spun cellulose fibers. In this process, tertiary amine oxides, in particular N-methylmorpholine-N-oxide (NMMO), are used as the solvent. The method is for example. Patent Document US-A 4,246,221 discloses a fiber characterized by high tenacity, high wet-modulus and high loop strength.

Patent document WO 99/19555 discloses a method of contacting 2,4-dichloro-6-hydroxy-1.3.5-triazine or a salt thereof as a method of treating solvent-spun fibers. The fibers produced by this method are characterized by having good resistance to fibrillation.

Patent document US Pat. No. 5,728,823 discloses cyclodextrin derivatives, especially the sodium salt of 2-chloro-4-hydroxy-1.3.5-triazinyl-cyclodextrin. Patent document US 5,728,823 also describes membranes, films, fabrics or leathers to which cyclodextrin derivatives are bound. Fabrics treated with cyclodextrin derivatives are suitable, for example, for absorbing unpleasant odors.

Patent document WO 01/48025 discloses a cyclodextrin covalently bonded to a polysaccharide by a crosslinking agent.

In accordance with the present invention, cellulosic shaped bodies prepared from cellulose solutions in aqueous tertiary amine oxides have been found to form articles with improved properties by treatment with fabric preparations comprising cyclodextrins and / or cyclodextrin derivatives.

Preferably, the molded body is a fiber in a never-dried state. The fibers can be treated in an undryable state in the post-treatment step of the continuous production production plant.

It is known that cyclodextrins may then comprise a treating agent that can be released, for example, over a long period of time. In the process according to the invention, fibers treated with cyclodextrins or cyclodextrin derivatives can be introduced during a continuous production process using such treatments simultaneously and / or continuously.

The treatment using the fabric preparation is preferably performed in an alkaline environment.

In addition, it is preferable that the fabric preparation further comprises a crosslinking agent. It is particularly preferable to use 2,4-dichloro-6-hydroxy-1.3.5-triazine or a salt thereof as the crosslinking agent, respectively.

In the state of the art according to patent document US Pat. No. 5,728,823, cyclodextrin derivatives such as, for example, 2-chloro-4-hydroxy-1.3.5-triazinyl-cyclodextrin are first applied to the substance to be subsequently treated. It must be manufactured with great effort.

Cyclodextrins and crosslinkers, in particular 2,4-dichloro-6-hydroxy-1.3.5-triazine, can be obtained with good results by being added to the fibers to be treated without first having to prepare compounds of these two materials. Turned out.

In another embodiment of the invention, the fabric preparation comprises 2-chloro-4-hydroxy-1.3.5-triazinyl-cyclodextrin (MCT-CD) or salts thereof, respectively.

The invention also relates to solvent spinning, cellulosic fibers and fiber assemblies containing such fibers obtainable according to the process of the invention.

Example 1:

Solvent spinning fibers prepared according to the method disclosed in patent document WO 93/19230 and having a titer of 1.3 dtex were treated in an undryable state as follows:

20 g / l of sodium salt of 2,4-dichloro-6-hydroxy-1.3.5-triazine, 16 g / l of NaOH and 100 g / l of cyclodextrin (CAVAMAX W7, manufactured by Wacker-Chemie) at room temperature The solution containing it was processed for 5 minutes in the state of liquid ratio 1:10. Thereafter, the fibers were squeezed using a press to obtain a water content of 100% to 110%, heat treated at 100 ° C. for 5 minutes with saturated steam (100%), and then washed and dried.

The content of the active cyclodextrin in the fiber prepared as described above was 2.33% by weight based on the photometric method using the decolorization method of the phenolphthalein solution (552 nm).

The degree of fibrillation of the fibers was measured using the wet wear resistance test method (test method according to patent document WO 99/19555) of the individual fibers. According to this test method, samples treated according to the present invention are found to exhibit an average value of an average of 210 revolutions. In comparison, the untreated fiber exhibits a wet wear value of only 40 to 60 revolutions.

Example 2:

20 g / L sodium salt of 2,4-dichloro-6-hydroxy-1.3.5-triazine, NaOH 16 g / L, soda 30 g / L, and cyclodextrin (CAVAMAX W7, manufactured by Wacker-Chemie) The solution containing / l was treated according to the same procedure as in Example 1.

The content of active cyclodextrin in the obtained fiber was 1.65 wt%, and the wet wear value was 470 revolutions.

Example 3:

Example 1 with a solution containing 30 g / l of soda and 100 g / l of 2-chloro-4-hydroxy-1.3.5-triazinyl-cyclodextrin (MCT-CD; CAVASOL W7 MCT, manufactured by Wacker-Chemie) The same procedure was followed.

The content of active MCT-CD in the obtained fiber was 1.89% by weight.

Claims (11)

As a process for treating a cellulosic molded body prepared from a cellulose solution in an aqueous tertiary amine oxide, Contacting the molded body with a textile auxiliary agent, The textile preparations comprise cyclodextrins and / or cyclodextrin derivatives. The processing method of a cellulose molded object. The method of claim 1, The molded article is a processing method of a cellulose-based molded article, characterized in that the fiber in a never-dried state. The method according to claim 1 or 2, The fabric preparation method further comprises a crosslinking agent. The method of claim 3, 2,4-dichloro-6-hydroxy-1.3.5-triazine or a salt thereof is used as the crosslinking agent. The method according to claim 1 or 2, The fabric preparation method comprises a 2-chloro-4-hydroxy-1.3.5-triazinyl-cyclodextrin or a salt thereof. A cellulose-based molded article obtained according to the method of claim 1 or 2. The cellulose-based molded body according to claim 6, wherein the molded body is a solvent-spun cellulose fiber. A fiber assembly containing the solvent-spun cellulose fibers of claim 7. A cellulose molded article obtained according to the method of claim 3. The cellulose-based molded body according to claim 9, wherein the molded body is a solvent-spun cellulose fiber. A fiber assembly containing the solvent-spun cellulose fibers of claim 10.