JP2570757B2 - Cellulose fiber processing method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a step of applying metal ions adhering to cellulose fibers such as cotton and hemp after scouring to a spinning oil (hereinafter sometimes simply referred to as an oil). The present invention relates to a method for treating cellulose fibers which can reduce the occurrence of troubles in the subsequent spinning process and reduce the amount and use of a spinning oil.

[Prior Art] Conventionally, in order to facilitate the spinning process, a spinning oil agent is applied to cellulose fibers after the scouring process by means such as spraying or dipping. Cellulose fibers naturally have an ion conversion function, and therefore adsorb various metal ions in a solution. For example, spinning process 1
Although Ca ⁺⁺ and the like contained in the wash water to be used in Zn ⁺⁺ and scouring steps with SnSO ₄ that is added in the bath is one example,
Even if a spinning oil agent is applied due to the adsorption of these metal ions, the friction coefficient of the cellulose fiber becomes a large value, causing trouble such as yarn breakage in the spinning process. For this reason, the amount of the oil agent to be applied must be considerably increased, and the amount of metal ions in the oil agent emulsion increases while the oil agent emulsion is circulated to the cellulose fibers (the oil agent is generally applied as an emulsion). Therefore, the oil emulsion having an increased metal ion concentration had to be discarded.

[Problems to be Solved by the Invention] Therefore, not only a large amount of spinning oil is required, but also a large amount of oil applied to the fiber in order to reduce the friction coefficient of the yarn, the spinning process, for example, rotating at high speed It was squeezed by the spinner's traveler and dropped off, causing equipment trouble.

Therefore, in the present invention, even if a large amount of the spinning oil is not adhered, the friction coefficient of the cellulose fiber can be reduced, no trouble occurs in the subsequent spinning process, and the oil emulsion can be used for a long time. The treatment method of various cellulose fibers was examined.

[Means for Solving the Problems] The present invention, which has solved the above problems, is characterized by reacting metal ions in a spinning oil emulsion which is circulated and used in a step of applying a spinning oil to cellulose fibers after a scouring step. A lower fatty acid having a carbon number of 8 or less to form scum (hereinafter, may be simply referred to as a lower fatty acid) or a derivative thereof, and the metal ion adsorbed on the cellulose fiber is converted to the lower fatty acid or the lower fatty acid. The gist of the invention is to react with a derivative and separate and remove the reaction product as scum out of the system.

[Function] As described above, the cellulose fiber has an ion exchange function and adsorbs metal ions such as Zn ⁺⁺ and Ca ^{++ as} described above. The acid salt reacts with the metal ion to form a metal salt, which dissolves in the oil emulsion. Accordingly, the metal salt concentration in the oil emulsion gradually increases while the oil emulsion is circulated and used, so that the waste must be disposed of as described above.

However, if the lower fatty acid or its derivative is contained in the oil emulsion, the metal ions combine with these fatty acids to form lower soap and float as scum on the liquid of the oil emulsion. Therefore, if a certain amount of scum on the liquid is stored and then removed, the oil concentration of the oil solution emulsion can be properly adjusted and used for a long period of time. Since the metal ions adsorbed on the fibers are removed, the coefficient of friction can be reduced without excessively attaching an oil agent. Therefore, troubles such as thread breakage and troubles of equipment in the subsequent steps are not caused.

The lower fatty acids or derivatives thereof used in the present invention to be contained in the oil agent emulsion include maleic acid,
There are fumaric acid, succinic acid, malic acid, coric acid, muconic acid and derivatives of these compounds. The amount of these lower fatty acids or derivatives added to the oil emulsion is determined by the amount of metal ions adsorbed on the fibers in the cellulose fiber production process and the amount of metal ions contained in the washing water, but is preferably 0.1 to 10% by weight in the emulsion. If it is less than 0.1%, only a part of the metal ions adhering to the cellulose fiber can be removed, so that the metal salt remains on the cellulose fiber and the friction coefficient becomes large, causing spinning trouble. If it exceeds 10%, the concentration of lower fatty acids and their derivatives will increase,
Further, since the concentration increases with time, precipitation of lower fatty acids and derivatives thereof occurs, the equilibrium concentration of the oil agent in the emulsion decreases, and the amount of the oil agent attached to the fiber decreases.

As the spinning oil, emulsified fatty acid sulfate, higher alkyl sulfate, ester sulfate, polyhydric alcohol ester sulfate, polyoxyethylene nonion sulfate, etc., which are generally used in a spinning plant, are used. Further, it may contain a paraffin wax or an antistatic agent.

[Example] In the raw cotton production process of the polynox table, tow was drawn to 6.5 million denier, cut with a cutter, and then subjected to scouring treatment. In the scouring step, first, an acid treatment and desulfurization for removing unreacted CS ₂ , H ₂ S and S remaining in the yarn are performed, followed by a bleaching treatment to increase the whiteness of the raw cotton. In the scouring process, a large amount of chemical solution is used for the above-described treatment, and washing is always performed before and after the treatment with the chemical solution to increase the efficiency of the chemical solution.

The yarn treated in the scouring process is subsequently subjected to an oil treatment.
The oil is applied as an emulsion. FIG. 1 shows a circulating system in a process of applying an oil emulsion.

The raw cotton passes under the oil sprayer 4 and receives the spray of the oil emulsion. At this time, the higher alkyl sulfate, polyhydric alcohol ester sulfate, polyoxyethylene nonion sulfate and the sizing agent in the store tank 2 are the main components. The oil emulsion 1 is sent to an oil sprayer 4 via a pump 3 and sprayed on raw cotton. The oil replaces the moisture in the raw cotton and attaches to the yarn. Excess oil emulsion passes through a wire mesh 5 and is collected in a tray 6 to return to the store tank 2. Since the concentration of the oil in the oil solution emulsion is reduced during circulation use, the concentration of the oil is measured by the oil concentration meter 7 and the oil is supplied from the concentrated oil tank 8 having a concentration of 100 g / from the metering pump 9 to the oil emulsion. Keep the concentration of the oil solution in 1 constant. In the above process, the succinic acid which is a lower fatty acid was blended in the oil solution emulsion in the example, and the succinic acid was not added. Show.

In the case of the present invention in which succinic acid was added to the oil emulsion 1, the scum (metal soap) 10 floated on the oil emulsion liquid surface of the store tank 2 over time. On the other hand, in the comparative example containing no succinic acid, no scum was generated, and the Ca ⁺⁺ and Zn ⁺⁺ concentrations in the oil emulsion were 2% when the succinic acid was added.
The concentration was 0 times.

[Effect of the Invention] Since the present invention is configured as described above, it is possible to reduce the friction coefficient of the cellulose fiber without attaching a large amount of the spinning oil to the cellulose fiber. Therefore, it is possible to prevent troubles such as yarn breakage after the scouring process and troubles due to excessive oil agent adhesion. Further, according to the present invention, the oil agent can be circulated and used for a long time, so that the amount of the oil agent used can be reduced together with the decrease in the amount of the oil agent attached.

[Brief description of the drawings]

 FIG. 1 is a schematic process drawing showing one embodiment of the present invention. 1 ... Spinning oil emulsion 2 ... Store tank 3 ... Pump 4 ... Oil sprayer 5 ... Wire mesh 6 ... Tray 7 ... Oil concentration meter 8 ... Thick oil tank 9 ... Metering pump 10 …… Scum

Claims (1)

(57) [Claims] 1. A spinning oil emulsion that is circulated and used in a step of applying a spinning oil to cellulose fibers after a scouring step, contains a lower fatty acid having 8 or less carbon atoms or a derivative thereof, which reacts with metal ions to form scum. A method for treating cellulose fibers, comprising reacting metal ions adsorbed on cellulose fibers with the lower fatty acid or a derivative thereof, and separating and removing the reaction product as scum out of the system.