JPH0641870A - Textile structure with ph buffering nature - Google Patents

Abstract

PURPOSE:To obtain the M textile structure by imparting the surface of a textile fabric with a specific acidic copolymer and a salt thereof. CONSTITUTION:The surface of a textile structure such as a knitted fabric or nonwoven fabric each made from natural or synthetic fibers is imparted with (A) a material acting as an acid, pref. a copolymer having 1000-1000000 weight- average molecular weight bearing weakly acidic groups such as carboxyl groups and (B) a salt thereof (e.g. sodium salt) to obtain the objective textile structure capable of adjusting the pH value of e.g. acidic rain to about 5-7, the mean pH value on the surface of the skin. The material with pH buffering nature is pref. a copolymer of acrylic acid and 2-hydroxyethyl acrylate, a copolymer of acrylic acid, 2-hydroxyethyl methacrylate and acrylamide.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a fiber structure having a pH buffering property.

[0002]

2. Description of the Related Art When synthetic fibers or natural fibers are treated with a strong acid or a strong base, neutralization is carried out with a weak acid or a weak base after the treatment.
It cannot be buffered. In addition, pH buffering is possible even in the commonly used antistatic processing, resin processing, etc.
In particular, it is difficult to provide a pH buffering property with washing resistance.

[0003]

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention An object of the present invention is to neutralize acid rain, which has become serious in Europe and the United States and may be affected in Japan, by attaching a compound having a pH buffering action to fibers. It is to provide a fiber structure having a function.

[0004]

DISCLOSURE OF THE INVENTION The present invention provides a pH buffer characterized in that a substance acting as an acid and salts thereof are deposited on at least the surface of fibers of a fiber structure and exhibit a pH of 5 to 7 when wet. The present invention relates to a natural fiber structure. Furthermore, the present invention provides a compound comprising a substance acting as an acid and salts thereof, having a carboxyl group and a carboxyl group neutralized into a salt form, and having a weight average molecular weight of 1,000 to 1,000.
The gist is a pH buffering fibrous structure which is a polymer and a copolymer of 10,000.

In the present invention, the fiber structure is not particularly limited, and includes woven fabrics, knitted fabrics or non-woven fabrics including all natural fibers such as cotton, wool and silk, and synthetic fibers such as polyester, nylon, acryl and acetate. Etc. are all included.

In the present invention, it is necessary that a compound consisting of a substance acting as an acid and salts thereof is attached to at least the surface of the fiber of the fiber structure. In the present invention, the substance acting as an acid is a substance which produces hydrogen ions in an aqueous solution and neutralizes a base to produce a salt, such as sulfuric acid, hydrochloric acid, phosphoric acid, acetic acid, formic acid, oxalic acid, tartaric acid, Examples include lactic acid, citric acid, malonic acid, succinic acid, adipic acid, acrylic acid, methacrylic acid, oleic acid, linoleic acid and benzoic acid. In the present invention, the salts include sodium salt, potassium salt, calcium salt, barium salt, lithium salt and the like.

As the substance acting as an acid, a weak acid, particularly a compound containing a carboxyl group is preferably used. The compound is a polymer of unsaturated carboxylic acid containing a hydrophobic monomer residue,
It is a copolymer, a copolymer of an unsaturated carboxylic acid and an ethylenically unsaturated monomer, or a mixture thereof. The degree of polymerization is controlled by changing the addition amount of a known chain transfer agent. The molecular weight of the above polymers and copolymers is 1,000 to 1,000,0.
00, preferably 10,000 to 500,000. Regarding the molecular weight, a calibration curve was prepared by gel permeation chromatography using pullulan, which is a water-soluble polymer of known molecular weight, as a standard substance, and the weight average molecular weight was determined using this. The copolymer of unsaturated carboxylic acid and ethylenically unsaturated monomer preferably contains 1 to 10 mol% of ethylenically unsaturated monomer.

Examples of unsaturated carboxylic acids include acrylic acid, methacrylic acid, crotonic acid, oleic acid, cinnamic acid, maleic acid, fumaric acid, citraconic acid and mesaconic acid. Examples of the ethylenically unsaturated monomer include 2-hydroxyethyl acrylate, 2-hydroxyethyl methacrylate, hydroxypropyl acrylate, acrylamide, N-methyl acrylamide, N, N-dimethyl acrylamide, N-methylol acrylamide, N, N-dihydroxy. Examples thereof include ethyl methacrylamide. Preferred polymers include copolymers of acrylic acid and 2-hydroxyethyl acrylate, copolymers of acrylic acid and N-methylol acrylamide, and copolymers of acrylic acid, 2-hydroxyethyl methacrylate and acrylamide. The polymer forms a salt neutralized to a predetermined pH value with a base such as sodium hydroxide or potassium hydroxide.

The effect of containing the ethylenically unsaturated monomer is pH.
Helps to improve the durability of the buffered laundry. Further, in order to improve the washing durability of pH buffering property, it is preferable to add a water-soluble epoxy compound to the above-mentioned polymers and copolymers.

The processing method of the present invention is not particularly limited, and may be a method capable of forming a thin film on at least the surface of the fiber of the fiber structure, such as a coating method, a Patto dry method, a put steam method, a spray method and a dipping method. I wish I had it. For example, in the Patto dry method, which is usually used as a resin processing method, a compound having a predetermined amount of the compound of the present invention is impregnated, squeezed, dried at 100 to 130 ° C., and heat treated at 150 to 180 ° C. to achieve excellent adhesion. Is.

Of the above-mentioned processing methods, the coating method is particularly preferable, and as the coating resin used in the present invention, acrylic resin, urethane resin, silicone resin and the like can be mentioned. The pH buffering effect is highly effective for porous resins, and examples thereof include urethane-based porous resins. Further, the pH buffering effect can be improved by kneading porous particles such as silicon dioxide, titanium dioxide, alumina, zirconia, magnesia, titanium nitride, zirconium carbide and zirconium oxide into the resin. The coating method of the resin liquid may be dry coating or wet coating, and a coating method such as a floating knife coater, a knife over roll coater, a reverse roll coater, a roll doctor coater, a gravure roll coater, and a kiss roll coater can be used. . Further, the coating film may be made porous by a known method. In the present invention, it goes without saying that various treatments such as water repellency and softness may be applied in addition to the coating process. However, the water-repellent treatment can be performed either before or after coating, but if it is performed before coating, it is necessary to pay sufficient attention to the adhesive strength.

In the application of the present invention, the amount of the compound attached on the fiber can be controlled by the concentration of the compound in the aqueous solution. The amount of the compound deposited on the fiber is preferably 0.05 to 5% by weight in terms of solid content. Adhesion amount is 0.0
When it is 5% by weight or less, the desired pH buffering effect is difficult to obtain, which is not preferable. On the other hand, if it exceeds 5% by weight, not only does the texture become rough and hard depending on the form of the treated cloth, but it also tends to hinder other processing treatments.

[0013]

EXAMPLES The present invention will be described in more detail below with reference to examples. The pH measuring method and the washing test of the processed fabric in the examples are as follows. (1) The pH value of the solution is F-12pH manufactured by Horiba Ltd.
Measured with a meter

(2) The pH value measuring method A for evaluating the pH buffering property of the cloth was measured by bringing a cloth moistened with a certain amount of liquid into contact with the electrode part of Twin B-112 pH meter manufactured by Horiba Ltd. Fabric weight is 0.02g, 0.1ml
The sample was moistened with the above liquid and subjected to pH value measurement. As a liquid for wetting the cloth, a solution prepared with distilled water and an acid or an alkali was used. It is judged that the closer the pH value of the cloth when wet with a liquid having a pH of 3 is closer to the value measured when wet with distilled water, the more the pH buffering property is.

(3) The pH value measuring method B for evaluating the pH buffering property of cloth is 2 g of cloth placed on a funnel of Nutsche having a diameter of about 9 cm, and 50 ml of a solution prepared with distilled water and an acid or alkali is put on the cloth. The pH value of the filtrate after pouring and filtering the cloth was measured. The pH value of the filtrate is judged to be more pH buffering as the value measured when pouring a solution having a pH of 4 is closer to the value when pouring distilled water.

(4) Washing test JIS L-0217
103 method

(5) Adhesion amount

[Equation 1]

In the examples, "part" means "part by weight", and the water vapor transmission rate and water pressure resistance are JIS-L-1099 and JIS-L-.
It was measured by 1092 (method A).

Example 1 A polyester woven fabric was polymerized with acrylic acid (90 mol%), butadiene (10 mol%) and a chain transfer agent, a polymer having a weight average molecular weight of 85,000 neutralized to a sodium salt, and an acrylic resin. A polymer having a composition of acid (95 mol%), 2-hydroxyethyl methacrylate (5 mol%) and a chain transfer agent and having a weight average molecular weight of 160,000 was mixed at a ratio of 6: 2 to obtain 1.2 wt% (vs. Fiber) added. As the application method, the woven fabric was dipped in a working liquid prepared by preparing an aqueous solution of a polymer, squeezed with a mangle, and then dried and heat-treated with a pintenter type hot air dryer. As Comparative Example 1, a polyester woven fabric containing 1. PMX-56 (antistatic agent) manufactured by Yoshimura Oil Chemical Co., Ltd. was used.
A 5% aqueous solution was used as a processing liquid and processed by the same method as the applying method of Example 1. The results of measuring the pH value of the processed fabric are shown in Table 1.

[0020]

[Table 1]

From the results shown in Table 1, the processed fabric of the present invention has a pH of 3.
It shows a buffering effect on the liquid of. On the other hand, the processed fabric of Comparative Example 1 does not exhibit a cushioning effect. This indicates that the processed fabric of the present invention has a large buffering effect, that is, a large buffering capacity.

Example 2 A polyester fabric was polymerized with a polymer having a weight average molecular weight of 85,000 neutralized to a sodium salt with a composition of acrylic acid (95 mol%), butadiene (10 mol%) and a chain transfer agent, and acrylic. An acid (95 mol%), 2-hydroxyethyl methacrylate (2.5 mol%), N-methylol acrylamide (2.5 mol%) and a chain transfer agent were used to prepare a polymer having a weight average molecular weight of 100,000 6: 6. The mixture was mixed in a ratio of 3 and added to 1.5% by weight (to the fiber). The application method was the same as in Example 1. As Comparative Example 2, a polyester woven fabric was manufactured by ELETAT AK-10 manufactured by Yushisha Co., Ltd.
A 2% aqueous solution of (antistatic agent) was used as a processing liquid and processed in the same manner as the applying method of Example 1. Table 2 shows the results of measuring the pH value of the processed fabric.

[0023]

[Table 2]

From the results shown in Table 2, the processed fabric of Comparative Example 2 had a pH value of
It does not have a buffering effect on the solution of No. 3. The processed fabric of the present invention exhibits a buffering action for a liquid of pH 3.

Example 3 A polyester woven fabric was prepared by adding acrylic acid (80 mol%), maleic acid (10 mol%), isoamylene (10 mol%) and a chain transfer agent to the potassium salt to neutralize the weight average molecular weight of 50, 6% by weight of polymer and acrylic acid (95
Mol%) and 2-hydroxyethyl methacrylate (5
Mol%) and the composition of the chain transfer agent, the weight average molecular weight of 35
An aqueous solution of a mixture of 2% by weight of a polymer of 50,000 and 3% by weight of ethylene glycol diglycidyl ether was applied as a working fluid in the same manner as in Example 1. After application, it was washed with hot water at 50 ° C. for 10 minutes. As Comparative Example 3, 0.3% by weight of Beckamine APM manufactured by Dainippon Ink and 0.3% by weight of Catalyst 376 were applied as processing liquids to a polyester fabric in the same manner as in Example 1. Table 3 shows the results of measuring the pH value of the processed fabric.

[0026]

[Table 3]

From the results shown in Table 3, the buffering effect is not obtained in Comparative Example 3, but the buffering effect is obtained in Example 3. In Example 3, the washing durability was further improved by adding the water-soluble epoxy compound.

Example 4 A plain weave composed of warp and weft 40 cotton yarn was processed by the same application method as in Example 1 using the processing liquid shown in Example 1. As Comparative Example 4, 3% by weight of Superflex E2000 manufactured by Dai-ichi Kogyo Seiyaku Co., Ltd. was applied as a processing liquid to the above cotton fabric in the same manner as in Example 1. Table 4 shows the results of measuring the pH value of the processed fabric.

[0029]

[Table 4] From the results shown in Table 4, the present invention can impart pH buffering property to cotton fabrics.

Example 5 A polyester fabric was provided with a pH buffering substance exhibiting a pH range of 5-7. As the application method, an aqueous solution of a pH buffer substance was used as a processing liquid, the fabric was dipped, squeezed with a mangle, and then dried and heat-treated with a pintenter type hot air dryer. In order to evaluate the pH buffering property of the processed fabric, the wet pH value was measured by the pH value measuring method A. The results are shown in Table 5.

[0031]

[Table 5]

From the results shown in Table 5, by selecting and adding a pH buffer substance, a pH of 5 to 7 is exhibited when moistened with distilled water, and a pH value when moistened with a pH 3 liquid also exhibits a buffering effect. A processed fabric having a pH buffering property can be obtained. However, washing durability is not obtained.

Example 6 The evaluation of the processed fabrics obtained in Example 1 and Comparative Example 1 was measured by pH value measuring method B. The results are shown in Table 6.

[Table 6] From the results of Table 6, p of the filtrate obtained by filtering the processed fabric according to the present invention
From the H value, the pH buffering property of the processed fabric of the present invention is recognized.

Example 7 The processed fabrics obtained in Example 3 and Comparative Example 3 were subjected to pH value measuring method A.
Measured by The results are shown in Table 7. PH 8 in Table 7
And pH 10 was prepared with sodium carbonate.

[Table 7] As a result of Table 7, the product of the present invention has a pH buffering property which is durable against washing with respect to alkali.

Example 8 Plain woven fabric using polyester filament yarn of 60d / 48f (warp density 98 yarns / inch, weft density 94 yarns / in)
ch) was subjected to dyeing and water repellent treatment with a fluorine-based water repellent to obtain a cloth. And acrylic resin (Teisan Resin SG-51 (solid content 17%) manufactured by Teikoku Chemical Co., Ltd.) 100
Polymer having a weight average molecular weight of 85,000 neutralized to a sodium salt with a composition of acrylic acid (90 mol%), butadiene (10 mol%) and a chain transfer agent in a part (solid content 30%)
12 parts of acrylic acid (95 mol%), 2-hydroxyethyl methacrylate (5 mol%) and a chain transfer agent having a weight average molecular weight of 160,000 (solid content 30)
%) 4 parts were prepared and applied using a floating knife coater. Immediately dry at a temperature of 120 ℃,
Then, heat treatment (170 ° C.) was performed. In addition, as Comparative Example 8, only the acrylic resin was added to the polyester fabric Example 8
It processed with the floating knife coater like. Table 8 shows the physical properties of the processed fabric. Here, W = 5 indicates the result of washing 5 times.

[0036]

[Table 8] From the results of Table 8, p of the filtrate obtained by filtering the processed fabric of the present invention
From the H value, the pH buffering property of the processed fabric of the present invention is recognized.

Example 9 100 parts of a porous urethane resin (Heimren X-3040 (solid content: 30%, manufactured by Dainichiseika Co., Ltd.)) was added with acrylic acid (90 mol%), butadiene (10 mol%) and chain transfer. 12 parts of a polymer (solid content 30%) having a weight average molecular weight of 85,000 neutralized with sodium salt in the composition of the agent, acrylic acid (95 mol%), 2-hydroxyethyl methacrylate (5 mol%) and chain transfer 4 parts of a polymer having a weight-average molecular weight of 160,000 (solid content: 30%) was mixed with 34 parts of water and 5 parts of methyl ethyl ketone as a solvent, and the mixture was gradually added dropwise to prepare. Then, the dough used in Example 8 was applied using a knife over roll coater, immediately dried at a temperature of 80 ° C., and heat-treated (170 ° C.). In addition, as Comparative Example 9, polyester fabric was processed with only a urethane resin by a knife over roll coater as in Example 9. Table 9 shows the results of physical properties of the processed fabric.

[0038]

[Table 9] From the results in Table 9, p of the filtrate obtained by filtering the processed fabric of the present invention
From the H value, the pH buffering property of the processed fabric of the present invention is recognized.

Example 10 An acrylic resin (Teisan Resin SG-51 manufactured by Teikoku Kagaku Co., Ltd. (solid content: 17%)) 10 was added to the cloth used in Example 8.
In 0 part, silicon dioxide porous particles (average particle size 2.7
μ) 40 parts and isopropyl alcohol 60 parts are mixed,
13 parts of a prepared porous silica liquid was added, and acrylic acid (90 mol%), butadiene (10 mol%)
And a polymer having a weight average molecular weight of 85,000 (solid content: 30%) neutralized to a sodium salt with the composition of a chain transfer agent 12
Part and acrylic acid (95 mol%), 2-hydroxyethyl methacrylate (5 mol%) and chain transfer agent, and a polymer having a weight average molecular weight of 160,000 (solid content 30
%) 4 parts were prepared, coated using a floating knife coater, immediately dried at a temperature of 120 ° C. and heat treated (170 ° C.). Further, as Comparative Example 10, only a polyester woven fabric prepared by adjusting an acrylic resin and a porous silica liquid was processed by a floating knife coater in the same manner as in Example 10. Table 10 shows the physical properties of the processed fabric.

[0040]

[Table 10] From the results of Table 10, the pH buffering property of the processed cloth of the present invention is recognized from the pH value of the filtrate obtained by filtering the processed cloth of the present invention.

[0041]

According to the present invention, a substance acting as an acid having a pH buffering action and salts thereof are attached to the fiber to neutralize acid rain and the like attached to the fiber and pass through the fiber structure. It has the effect of bringing the pH value of acid rain or the like that comes into contact with the skin close to pH 5 to 7, which is said to be the average pH value on the skin surface. Further, in the present invention, a pH buffering property with washing durability is recognized even with respect to alkali.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Toyohiro Tanaka 1-11 Kanebocho, Nagahama-shi, Shiga (72) Inventor Hiroshi Shibaoka 1849-94 Matsubara-cho, Hikone-shi, Shiga

Claims (2)

[Claims] 1. A pH buffering fiber structure, wherein a substance acting as an acid and salts thereof are deposited on at least the surface of the fiber of the fiber structure and exhibiting a pH of 5 to 7 when wet. 2. A weight average molecular weight of 1,000 to 1.00 in which a compound consisting of a substance acting as an acid and salts thereof contains a carboxyl group and a carboxyl group neutralized into a salt form.
The pH buffering fibrous structure of claim 1 which is 20,000 polymers and copolymers.