JPH01292169A - Production of deodorant fiber - Google Patents

Abstract

PURPOSE:To obtain the title excellent fiber without impairing functions inherent in fiber such as feel and water absorptivity, by impregnating a microporous fiber with an aqueous solution containing tannic acid and a transition metal followed by reaction and by carrying the resulting reaction product on said microporous fiber. CONSTITUTION:A polyester-based or acrylic microporous fiber is impregnated with tannic acid and a transition metal compound selected from sulfates, nitrates, carbonates and chlorides of iron, copper etc., followed by reaction between the tannic acid and the transition metal compound, and the resulting reaction product is carried on said microporous fiber.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a method for producing fibers having a deodorizing function. More specifically, the present invention relates to a method for producing deodorizing fibers, which is characterized in that a reaction product of tannic acid and a transition metal is supported as a deodorizing component in microporous fibers.

[Conventional technology]

Many deodorants have been developed as substances that remove malodorous substances such as ammonia, hydrogen sulfide, and mercaptans, such as extracts from plants of the Camellia family and mixtures of divalent iron compounds and L-ascorbic acid. In addition, in an attempt to impart deodorizing functions to textile products themselves, many fibers and textile products using these deodorants are being developed.

When trying to impart a deodorizing function to fibers, there are two ways to do so:

The first method is to mix a deodorant into the spinning solution when making fibers by spinning synthetic fibers, etc., and the second method is to add a deodorant to the spinning dope (method). This applies a deodorant.

[Problem to be solved by the invention]

A deodorizing agent is mixed into the spinning stock solution (this method requires that the deodorant itself has heat resistance and chemical resistance comparable to the spinning conditions. Furthermore, the mixed deodorizing agent does not damage the fibers. Since it is covered in the forming polymer, it cannot fully demonstrate its original deodorizing ability, and has disadvantages such as requiring more deodorizing agent.

On the other hand, when deodorizing fibers through post-processing, most deodorants do not have an affinity for the fibers themselves, so they are simply applied to the surface of the fibers, or are fixed with resin, etc. This is the most common method.

In the former case, the deodorant easily comes off not only during washing but also due to physical contact and vibration during use.

In the latter case, although the durability is improved, since the deodorant is coated with resin etc., the original deodorizing ability of the deodorant cannot be fully demonstrated, as in the case of spinning. I can't. Furthermore, depending on the resin used for fixing, the functions of the fiber itself, such as hydrophilicity, bulkiness, and even texture, may be impaired.

Therefore, as a result of extensive research, the present inventors found that a method of generating a water-insoluble deodorizing component through a reaction in the fiber,
Since fibers can be processed in the form of post-treatment and do not require fixation with resin, there is no deterioration in the performance of the deodorant (also, it is a powerful deodorant without damaging the original function of the fibers). We have developed a method for producing fibers with deodorizing properties.

[Means to solve problems]

That is, the present invention relates to a method for producing deodorizing fibers, which is characterized in that a reaction product of tannic acid and a transition metal is supported as a deodorizing component in microporous fibers.

Conventionally, attempts have been made to utilize tannic acid and tannic acid derivatives to deodorize malodorous substances. (Japanese Patent Application Laid-open No. 54-8725, etc.) It is thought that this effect is responsible for the fact that it can also be used as an additive for cigarette filters. (Japanese Patent Publication No. 54-18358, Japanese Patent Publication No. 57-118
785, etc.) However, these products use tannic acid or tannic acid derivatives as they are in the form of powder or granules, and are simply used in the same way as deodorants such as activated carbon.

We have confirmed that the reaction product of tannic acid and transition metals is very effective as a deodorizing component, and have investigated supporting this deodorizing component on fibers.

However, most of the reaction products of tannic acid and transition metals are water-insoluble and do not have good affinity even when applied to fibers as they are, making it practically impossible to treat them.

Therefore, we focused on the fact that tannic acid and many transition metal compounds are water-soluble when they are used alone, but only when they are mixed produce a water-insoluble deodorizing ingredient. Tannic acid and a transition metal compound are introduced separately, the tannic acid and the transition metal compound are reacted in the fiber, and the reaction product of the tannic acid and the transition metal compound is added to the microporous fiber as a deodorizing component. The present invention has developed a method for producing deodorant fibers in which deodorizing components are supported without using any adhesives such as resins.

Microporous fibers referred to in the present invention are synthetic fibers, semi-synthetic fibers, and recycled fibers in which countless micropores are dispersed on the fiber surface and inside the fiber, and some of these micropores are connected. means. Examples of these microporous fibers include DUN
Acrylic fibers such as OVA (Bayer), LEAGLOR (Monte Fiber), Aqualon (Kanebo), Suit-K (Mitsubishi Rayon), Tsurushi (Asahi Kasei), Cerival (Nihon Exlan), and Welky (Music University)
Examples include polyester fibers such as, but are not limited to these examples.

Most of these were developed to improve water absorption, which is a drawback of synthetic fibers.

For example, Welky is a hollow cross-section polyester fiber that has water absorption ability due to capillary action by introducing a special micropore structure into the polyester fiber. A countless number of micropores are dispersed, and some of these micropores form through holes from the surface to the hollow portion.

Due to this structure, these microporous fibers exhibit remarkable water absorption, and due to this water absorption, the aqueous solution of tannic acid and transition metal compound used in the present invention is quickly introduced into the fibers.

Then, it reacts inside the fiber to produce a water-insoluble deodorizing component, and this water-insoluble deodorizing component is trapped inside the fiber and is not easily released to the outside of the fiber.

Therefore, durable deodorizing component-carrying fibers are formed.

The deodorizing components cannot easily come out from inside the fibers, but the malodorous components freely enter the fibers and are deodorized.

The deodorizing fiber according to the present invention does not require the fixation of the deodorizing component with a resin or the like, so it does not cause a deterioration in the performance of the deodorant and does not impair the original functions of the fiber, such as water absorption. , can exhibit a powerful deodorizing function.

Further, regarding the form of these fibers, all forms of fibers such as fiber, sliver, thread, 1m111 material, and nonwoven fabric can be processed.

The tannic acid that can be used in the present invention is tannic acid in a broad sense, and includes all so-called tannins including so-called hydrolyzable tannins and condensed tannins.
Examples include gallotannins, ellagitannins, keplacotannins, waratol tannins, mangrove tannins, sublucan tannins, gambir tannins, red catechins, and oak bark tannins.

The transition metals referred to in the present invention have an atomic number of 21 (
Sc) ~29(Cu), 39(Y) ~47(A
g), 57 (La) ~ 79 (^u), 89 (
Ac) ~103 (Lr) and 30 (Zn),
48 (Cd).

This refers to everything including 80 (Hg).

Tannic acid and these transition metals are thought to form complexes, such as titanium tannate, iron tannate, nickel tannate, copper tannate, palladium tannate, silver tannate, gold tannate, etc. Many reactants are possible. Among them, the most preferred are iron tannate and tannin-plated copper.

Iron tannate is particularly effective against basic odors such as ammonia, while tannin-coated copper has a remarkable deodorizing effect not only against basic odors such as ammonia, but also against hydrogen sulfide and mercaptans. demonstrate.

The method of supporting a reaction product of tannic acid and a transition metal as a deodorizing component on microporous fibers is to first treat the microporous fibers with either an aqueous solution of tannic acid or an aqueous solution of a transition metal compound, and then By subsequently treating it with the other component, the two components react inside the microporous fibers to produce a water-insoluble deodorizing component.

In this case, either the tannic acid aqueous solution or the transition metal compound aqueous solution may be used as the first component or the second component, and there is basically no difference in the deodorizing component obtained. In terms of workability,
There is not much difference between them.

The treatment liquid used as the first component and the second component is an aqueous solution of tannic acid or an aqueous solution of a transition metal compound.
As the transition metal compound, transition metal salts are preferred;
Sulfates, nitrates, carbonates, and chlorides of transition metals are considered.

Examples of these include ferrous chloride, ferric chloride, ferrous sulfate, ferric sulfate, cuprous chloride, cupric chloride, cuprous sulfate, and cupric sulfate. However, it is not limited to these.

First, as a first step, possible methods for treating microporous fibers with the first component include dipping, padding, spraying, coating, etc., and although we do not intend to place any restrictions on these methods, there are In particular, the dipping method and the pad method are preferable.

When fibers are treated with the aqueous solution of the first component by a dipping method, fibers in all forms such as fibers, slivers, threads, VA knitted fabrics, and nonwoven fabrics can be treated. Specifically, the method involves immersing microporous fibers in a 0.01 to 30% solution of the first component, adjusting the pH to 2 to 10, and
Process at 0-100°C for 5-120 minutes. After the immersion treatment with the aqueous solution of the first component, the second stage treatment begins; however, there is no restriction as to whether or not a washing step and/or a drying step is performed.

When fibers are treated with a padding method using an aqueous solution of the first component, this can be done particularly for woven or knitted fabrics or nonwoven fabrics. Then, use a mangle or similar tool to squeeze the material to a uniform squeezing rate. After the pad squeezing, the second stage of treatment begins, but there is no restriction as to whether or not a washing step and/or a drying step is required.

Next, in the second step, the second component is made to act on the microporous fibers supporting the first component.

Possible methods for treating the first component-supported fibers with an aqueous solution of the second component include dipping, padding, spraying, and coating, and although no limitations are intended to be placed on these methods, practical The immersion method is preferred. Specifically, the fibers carrying the first component produced in the first step are immersed in an aqueous solution of the second component, and the fibers carrying the first component are quenched by the reaction between the first component present in the microporous fibers and the second component in the treatment solution. A compound with an odor function is supported in the microporous fibers.

There are no particular restrictions on the amount of the second component used,
It can be suitably selected from a wide range, but a solution containing 0.1 to 30% is practical. This solution is adjusted to pH 2 to 10 and treated at a temperature of 20 to 100° C. for 5 to 120 minutes. After performing the second stage treatment, the solution is dehydrated and dried to obtain deodorizing fibers. At this time, there is no limit intentionally placed on the presence or absence of a water washing step for the purpose of removing components adhering to the fiber surface.

For the deodorizing fibers produced by the above method, the deodorizing function must not be significantly impaired by normal finishing treatments such as softener application, resin processing, coating, and other functional finishes. Well, there's no harm in going there.

〔Example〕

The present invention will be explained below with reference to Examples.
The invention is not limited to these examples.

Example 1: Microporous polyester fiber, Welky (Ondai) fabric (basis weight: 150 g/rrr) was padded with a 3% aqueous solution of tannic acid according to the Japanese Pharmacopoeia, squeezed to a pick-up of 70%, and dried.

This tannic acid-supported polyester fabric was
It was immersed in a 2% aqueous solution of HzO at a bath ratio of 1:30, adjusted to pH 7.0, and treated at 40° C. for 10 minutes. After the treatment, it was washed with water, dehydrated, and dried to obtain an iron tannate-supported polyester fabric.

Example 2: Microporous polyester fibers, Welky (Ondai) fabric (basis weight 150 g/rd) were immersed in a 3% aqueous solution of Cu5Oa 5HzO at a bath ratio of 1:30, and the pH was adjusted to 5.0 and 6.
It was treated at 0°C for 10 minutes. After the treatment, the liquid was removed and the next step was continued. This copper-supported polyester fabric was added to a 2% aqueous solution of tannic acid according to the Japanese Pharmacopoeia at a bath ratio of 1:30.
The sample was immersed in water, adjusted to pH 5.0, and treated at 50° C. for 30 minutes. After the treatment, it was washed with water, dehydrated, and dried to obtain a copper tannate-supported polyester fabric.

Example 3: A microporous acrylic fiber, D (INOVA (Bayer) knitted fabric (basis weight 120 g/rrr), was immersed in a 3% aqueous solution of tannic acid in the Japanese Pharmacopoeia at a bath ratio of 1:30.
H was set to 4.0 and treated at 60° C. for 20 minutes. After the treatment, the liquid was removed and the next step was continued.

This tannic acid-supported acrylic knitted fabric was
immersed in a 3% aqueous solution of B20 at a bath ratio of 1:30;
was set to 6.0 and treated at 60°C for 45 minutes.

After the treatment, it was washed with water, dehydrated, and dried to obtain a tannic acid printing-supported acrylic knitted fabric.

Example 4: Microporous acrylic fiber, DUNOVA (Bayer) cotton, was prepared in a 2% aqueous solution of Pe504.7HtO at a bath ratio of 1:3.
The sample was immersed at 50° C. for 10 minutes to adjust the pH to 6.0.

After the treatment, the liquid was removed and the next step was continued.

This iron-supported acrylic cotton was immersed in a 3% aqueous solution of tannic acid according to the Japanese Pharmacopoeia at a bath ratio of 1:30, and the pH was adjusted to 6.0.
The mixture was heated to 50° C. for 60 minutes. After the treatment, it was washed with water, dehydrated, and dried to obtain iron tannate-supported acrylic cotton.

Confirmation of deodorizing effect: Confirmation of the deodorizing effect of the deodorant fibers obtained in the above examples was carried out as follows.

As shown in FIG. 1, 1.0 g of deodorant fiber is suspended in a 500 ml Erlenmeyer flask and the flask is sealed. Next, use a microsyringe or pipette to place the following Okugen into the bottom of the Erlenmeyer flask, being careful not to let the Okugen come into contact with the deodorant fibers. After the odor source at the bottom was completely vaporized or reacted using a dryer, it was left to stand at room temperature for 60 minutes. The measurements were performed using a Kita-type gas detection tube.

Odor source: ■ Ammonia 50μ of 6% ammonia aqueous solution!
injection.

■Hydrogen sulfide-800ppm NatS 1m j+
After injecting IN H2SO40,1n+j! Inject and react.

■Methyl meru Methyl mekabutane manufactured by Wako Pure Chemical Industries ■
Table 1 shows the measurement results obtained by injecting 100 μl of 1 μg/μm (benzene solution) of Lecaptan standard solution.

〔Effect of the invention〕

As seen in the confirmation results of the deodorizing effect in Examples (Table 1), the deodorizing effect of the deodorant fibers of the present invention is very excellent.

Furthermore, unlike deodorants that are fixed using resins, they have excellent features such as texture, water absorption, and other properties that do not reduce the original functions of fibers.

In addition, all forms of fiber, sliver, yarn, woven and knitted fabrics, and non-woven fabrics can be obtained, so they can be used in many fields that require deodorizing performance, such as futon cotton, insulation for winter clothing, sheets, It is very effective in filters for air purifiers, etc.

[Brief explanation of the drawing]

FIG. 1 shows experimental equipment for confirming the deodorizing effect of the present invention. In the figure, (1) 500ml Erlenmeyer flask (2) Sample (untreated fiber or deodorizing fiber) (3) Odor source (4) Airtight seal (5) North type gas detection tube

Claims (1)

[Claims] A deodorizing fiber characterized in that tannic acid and a transition metal are reacted in the microporous fiber, and a reaction product of the tannic acid and the transition metal is supported as a deodorizing component in the microporous fiber. Manufacturing method.