JP2002069838A - pH-BUFFERING CLOTH - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cloth having a pH-buffering performance against an acid rain and also having washing resistance of the pH-buffering performance. SOLUTION: This pH-buffering cloth is obtained by fixing at least an inorganic compound with the fibrous cloth through a binder resin, and shows pH 5-7 when it is wet.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a fabric having a pH buffering performance.

[0002]

2. Description of the Related Art It has been difficult to impart pH buffering performance to textile fabrics in finishing processes such as dyeing, antistatic and water absorbing processes. In particular, it has been very difficult to provide washing durability pH buffering performance.

[0003]

SUMMARY OF THE INVENTION An object of the present invention is to provide a fiber cloth having a pH buffering property against acid rain, which has become a particular problem in Japan in recent years, and a washing durability with the pH buffering property. It is in.

[0004]

SUMMARY OF THE INVENTION The present invention provides a pH buffering cloth comprising a fiber cloth having at least an inorganic compound immobilized thereon via a binder resin and exhibiting a pH of 5 to 7 when wet.

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION The fibrous fabric in the present invention is not particularly limited, and includes all fibrous fabric products such as general woven fabric, knitted fabric and nonwoven fabric. Examples of the types of fibers constituting the fiber fabric include natural fibers such as cotton and wool, synthetic fibers such as polyester fibers and nylon fibers, regenerated fibers such as rayon, and semi-synthetic fibers such as triacetate fibers.

In the present invention, the term “inorganic compound” refers to an inorganic compound having a pH buffering property, and more specifically, an amphoteric metal compound, a basic metal compound and an acidic metal compound. When a compound is used, a fabric excellent in pH buffering performance can be obtained. From the viewpoint of safety and coloring properties to the human body, zinc, aluminum, oxides or hydroxides of tin are preferably used as the amphoteric metal compound, and oxides or hydroxides of magnesium are preferably used as the basic metal compound. As the acidic metal oxide, an oxide or hydroxide of titanium or silicon is used.

From the viewpoint of improving the pH buffering performance of the obtained pH buffering fabric, the particle diameter of the inorganic compound is preferably 30 μm or less, more preferably 5 μm or less. Further, the inorganic compound is more preferably in a microporous state. The above-mentioned inorganic compounds can be used alone or in combination of two or more. From the viewpoint of improving the pH buffering performance, the amphoteric metal compound preferably accounts for 20% by weight or more of the entire inorganic compound, and more preferably 50% by weight or more of the entire inorganic compound.

[0008] In the present invention, the binder resin for fixing the inorganic compound to the fiber cloth is not particularly limited, and may be a urethane resin, an acrylic resin, a silicone resin, a polyamide resin, a polyester resin, a urea resin, or the like. Various resins can be used. Generally, it is preferable to use a urethane resin or an acrylic resin from the viewpoint of the feeling and the washing durability of the pH buffering performance.

[0009] Further, in order to further improve the washing durability of the pH buffering performance of the obtained pH buffering cloth, various crosslinking agents can be added to the binder resin. As the crosslinking agent, isocyanate-based, melamine-based or epoxy-based ones can be preferably used. In the present invention, the processing method for immobilizing the inorganic compound on the fabric via the binder resin is not particularly limited,
Various methods such as a pad-dry method, a printing method, a coating method, and a spray method can be used.

The proportion of the inorganic compound added to the binder resin is preferably in the range of 1: 0.1 to 1:20 in terms of solid content. When the addition ratio is less than 1: 0.1, p
It becomes difficult to obtain H buffer performance. The addition ratio is 1: 2
If it exceeds 0, the washing durability of the pH buffering performance may be insufficient. The total adhesion amount of the binder resin and the inorganic compound to the fiber cloth is desirably 0.1 to 20% by weight in terms of solid content. When the adhesion amount is less than 0.1% by weight,
It becomes difficult to obtain pH buffer performance. On the other hand, if the amount exceeds 20% by weight, the feeling of the cloth becomes coarse and hard, which is not preferable.

The object of the present invention is to obtain a cloth having a pH buffering property against acid rain. However, depending on the inorganic compound used, a cloth having a pH buffering property against an alkaline liquid can be obtained. In particular, when an amphoteric metal compound is used, a fabric excellent in pH buffering performance for both acid rain and alkaline liquid can be obtained.

In producing the pH buffering fabric of the present invention, if necessary, before, during or after the application of the inorganic compound, various processes such as antistatic treatment, water absorption treatment, softening treatment, antibacterial treatment and the like can be carried out. Processing may be performed.

[0013]

The present invention will be further described below with reference to examples and comparative examples. “Parts” in the examples indicates “parts by weight”. The pH measurement method, pH buffer performance evaluation method, washing method and the like in the examples were performed by the following methods.

(1) The pH was measured with a pH meter F-13 manufactured by Horiba, Ltd. (2) The pH buffering performance of the fabric was determined by the filtration test funnel.
A 0 g piece of the reference fabric was placed, and 10 ml of distilled water (pH 6.8) or dilute sulfuric acid (pH 3.1) was poured from above the fabric piece, and evaluated by a filtration test method for measuring the pH of the liquid passed through the fabric. It is determined that the pH of the filtrate when distilled water is used is substantially neutral, and that the pH of the filtrate when dilute sulfuric acid is used is closer to neutrality.

(3) The washing process is JIS L0217
Performed according to the 103 method. (4) The adhesion amount (% by weight) was calculated by the following equation. Amount (weight%) = [(weight of processed fabric−weight of unprocessed fabric) / (weight of unprocessed fabric)] × 100 Example 1, Comparative Example 1 20 parts of microporous zinc oxide powder Add 68 parts of water to 10 parts of microporous titanium dioxide powder,
0.5 part of a tamol-based dispersant and 1.5 parts of carboxymethylcellulose are added, mixed by a ball mill for 3 hours, and zinc oxide having a solid content of 30% (average particle diameter 2 μm)
+ A titanium dioxide (average particle size: 2 μm) dispersion A was obtained.
Next, 2 parts of Implanter DLS (urethane resin, solid content 40%) manufactured by Bayer and 88 parts of water were added to 10 parts of the dispersion A to prepare a working fluid.

After immersing the polyester fabric in the working fluid, squeezing it with a mangle, drying it using a hot air oven,
For 1 minute to obtain a pH buffering cloth having a weight ratio of binder resin to inorganic compound of 1: 3.8 and an adhesion amount of binder resin + inorganic compound of 2.7% by weight. As Comparative Example 1, a 1% aqueous solution of Nicepol FE26 (antistatic agent) manufactured by Nichika Chemical Co., Ltd. was used as a processing liquid for a polyester fabric, and processed in the same processing method as in Example 1 to obtain a comparative processed cloth.

Table 1 shows the results of evaluating the pH buffering performance of each of the processed fabrics.

[0018]

[Table 1]

From the results in Table 1, the work cloth of Example 1 is
It can be seen that the pH buffering performance is exhibited with respect to dilute sulfuric acid having a pH of 3.1 before and after washing. On the contrary,
No pH buffering performance was observed in the processed fabric of Comparative Example 1. Example 2, Comparative Example 2 15 parts of microporous aluminum hydroxide powder, 1 part
Using 5 parts of microporous zinc hydroxide powder, in the same manner as in Example 1, aluminum hydroxide having a solid content of 30% (average particle diameter 2 μm) + zinc hydroxide (average particle diameter 2 μm)
m) A dispersion B was obtained. Next, 20 parts of Newcoat S2170 (acrylic resin, solid content 50%) manufactured by Shin-Nakamura Chemical Co., Ltd. were added to 80 parts of the dispersion B to prepare a working liquid.

1 for polypropylene spunbond nonwoven fabric
Transfer the working fluid using a gravure machine using a 00 mesh roll, perform a heat treatment at 100 ° C. for 1 minute,
P having a weight ratio of binder resin to inorganic compound of 1: 2.4 and an adhesion amount of binder resin + inorganic compound of 6.2% by weight
An H buffer fabric was obtained. As Comparative Example 2, 100 parts of Newcoat S2170 was used as a processing liquid and processed in the same processing method as in Example 2 to obtain a comparative processed cloth.

Table 2 shows the results of the evaluation of the pH buffering performance of each of the processed fabrics.

[0022]

[Table 2]

From the results shown in Table 2, the work cloth of Example 2 was
It can be seen that the pH buffering performance is exhibited with respect to dilute sulfuric acid having a pH of 3.1 before and after washing. On the contrary,
No pH buffering performance was observed in the processed fabric of Comparative Example 2. Example 3, Comparative Example 3 15 parts of microporous zinc oxide powder, 5 parts of microporous silicon dioxide powder, 70 parts of dimethylformamide and 10 parts of Chrisbon 8006 manufactured by Dainippon Ink and Chemicals, Inc. Urethane resin, solid content 30%)
The mixture was mixed by a ball mill for 3 hours, and zinc oxide having a solid content of 23% (average particle diameter 1 μm) + silicon dioxide (average particle diameter 1
μm) Dispersion C was obtained. Next, 40 parts of Crisbon 8006 and 3 parts of Vernock D500 (isocyanate-based crosslinking agent) manufactured by Dainippon Ink and Chemicals, Inc. were added to 60 parts of the dispersion C.
Was added to prepare a working fluid.

After coating the processing liquid on the nylon fabric by the floating knife method, the urethane resin is coagulated and desolventized in water, dried, and then heat-treated at 160 ° C. for 1 minute to obtain a weight of the binder resin and the inorganic compound. A pH buffering fabric having a ratio of 1: 0.87 and an adhesion amount of binder resin + inorganic compound of 10% by weight was obtained. As Comparative Example 3, 40 parts of Chrisbon 8006 + 60 parts of dimethylformamide was used as a working liquid, and processed in the same processing method as in Example 3 to obtain a comparative processed cloth.

Table 3 shows the results of the evaluation of the pH buffering performance of each of the processed fabrics.

[0026]

[Table 3]

From the results in Table 3, the work cloth of Example 3 is
It can be seen that the pH buffering performance is exhibited with respect to dilute sulfuric acid having a pH of 3.1 before and after washing. On the contrary,
No pH buffering performance is observed in the processed fabric of Comparative Example 3.

[0028]

According to the present invention, there is provided a pH buffering cloth having an action of buffering the pH of acid rain or the like adhering to the fiber to a slightly acidic side. Thus, even in the case of acid rain or the like, the pH can be brought close to the average pH 5 to 7 of human skin. This pH buffering fabric has washing durability.

Claims (5)

[Claims] At least an inorganic compound is immobilized on a fiber cloth via a binder resin.
PH-buffered fabrics exhibiting ~ 7. 2. The fabric according to claim 1, wherein the inorganic compound is an amphoteric metal compound, a basic metal compound and / or an acidic metal compound. 3. The fabric according to claim 2, wherein the amphoteric metal compound is an oxide or hydroxide of zinc, aluminum or tin. 4. The fabric according to claim 2, wherein the basic metal compound is a magnesium oxide or hydroxide. 5. The fabric according to claim 2, wherein the acidic metal compound is an oxide or hydroxide of titanium or silicon.