JPH0149830B2 - - Google Patents

Description

[Detailed description of the invention]

[Field of Industrial Application] This invention relates to a deodorizing fiber and a method for producing the same, and more specifically to a deodorizing fiber that can efficiently prevent bad odors caused by adhesion of secretions from the human epidermis. The present invention relates to synthetic fibers and methods for producing the same. [Prior Art] In general, natural fibers such as cotton, hemp, wool, and silk, or chemical fibers of the same quality as natural fibers are used for underwear because they are required to have high hygroscopicity. However, because these underwear come into direct contact with the skin, they are contaminated with secretions from the human epidermis (secretions from sebaceous glands and sweat glands), and when these are absorbed and contained in the fibers, they emit bad odors. is causing the This phenomenon is particularly noticeable in bedridden sick people and young people who are prone to sweating. To prevent the spread of such bad odors, deodorants are sprayed or applied directly onto the human body. Known examples of such deodorants include adsorption type deodorants such as activated carbon, neutralization type deodorants made of alkaline or acidic substances, and biological deodorants based on the decomposition action of microorganisms. . However, little is known about the means to directly deodorize the malodorous components transferred from the human body through textiles that come into contact with human skin, especially underwear. Deodorizing means with a so-called Sandermanch structure, in which layers are removably attached to form a multilayer structure, are only occasionally seen in bedding. [Problems to be Solved by the Invention] The deodorizing bedding with the sandwich structure in which the activated carbon is removably attached is merely a product in which a deodorizing agent is separately supported on the bedding, and the fibers themselves have a deodorizing effect. Introducing a structure that separately supports such a deodorant into underwear, etc., would be a bad idea for underwear, which is supposed to be lightweight, easy to wear, and easy to wash. This is not particularly desirable and is fundamentally unreasonable. This invention was developed as a result of intensive research in view of the current situation.
The purpose is to apply a deodorant treatment to the natural fibers used for underwear and the like using an extremely simple method, thereby preventing bad odors emitted from the human body. [Means for Solving the Problems] In order to achieve the above object, the deodorizing fiber of the present invention has a natural monofilament or a fiber cloth woven from the monofilament, and the alkyl group has carbon atoms of 8 to 8. It supports a low polymer with a degree of polymerization of 1200 to 2000 obtained by polymerizing one or more of the 14 methacrylic acid alkyl esters. On the other hand, in the method for producing deodorized fibers, a processing liquid containing one or more methacrylic acid alkyl esters having an alkyl group of 8 to 14 carbon atoms is added to a natural single fiber or the single fiber. A woven fiber cloth is impregnated and a low polymerization degree methacrylic acid alkyl ester polymer having a polymerization degree of 1200 to 2000 is fixed to the single fiber or fiber cloth by curing. The fibers applicable to this invention include cotton, linen,
Natural fibers such as wool and silk. These fibers may be filament-like single fibers or fiber cloths woven from the single fibers (hereinafter simply referred to as "fibers"). On the other hand, the methacrylic acid alkyl ester used for deodorization is an ester in which the alkyl group has 8 to 14 carbon atoms, and the methacrylic acid alkyl ester in which the alkyl group has 8 to 14 carbon atoms has the general formula: (However, R is a C=8-14 alkyl group.) Among these, more preferable example compounds include 2-ethylhexyl ester of methacrylic acid (alkyl group has 8 carbon atoms), lauryl ester (alkyl group has 12 carbon atoms), and tridecyl ester (alkyl group has 13 carbon atoms). These methacrylic acid alkyl esters may be used alone or in combination of two or more. When the methacrylic acid ester having an alkyl group having 8 to 14 carbon atoms is applied to fibers, it satisfies safety for the human body and stability of the compound, and can be firmly fixed to the fibers by curing. It is possible. The method for producing deodorized fibers according to the present invention uses the above-mentioned alkyl methacrylate as a main deodorizing agent, and disperses this in purified water together with a processing aid to form a suspended processing liquid. The purpose of such a processing aid is to form an emulsion of the alkyl methacrylate ester, improve its permeability between the intertwined fibers, and prevent the polymer from gelling due to a chain reaction during polymerization. The following surfactants are preferably used in order to improve the permeability of liquid between fiber tissues. Polyoxyethylene alkyl ether, polyoxyethylene alkyl phenol ether, etc. as polyethylene glycol-based surfactants. As polyhydric alcohol-based surfactants, sucrose fatty acid ester, glycerin fatty acid ester,
Sorbitan fatty acid ester, etc. In addition, various synthetic resins such as acrylic and vinyl acetate, which have compatibility with the methacrylic acid alkyl ester and can form good emulsions, are used as processing aids to further improve the texture of the fibers. It may be used in combination in the form of A desirable concentration of the methacrylic acid alkyl ester in such a processing liquid is approximately 3 to 5% (wt%; the same applies hereinafter) based on the total amount of the processing liquid. As mentioned above, impregnation with the processing liquid can be carried out on the single fibers themselves or on the single fibers woven into a fiber cloth. In order to minimize the shedding or damage of the deodorizing component that occurs during the process of forming a fabric, it is more desirable to perform an impregnation treatment after weaving. Impregnation with a processing liquid includes immersing the fiber in the processing liquid,
Alternatively, various methods such as spraying, brushing the processing fluid, or even rolling may be employed, and either a batch method or a continuous method can be applied. In general, the larger the amount of methacrylic acid alkyl ester impregnated into the fiber, the more deodorizing effect can be expected. It is not advisable to impregnate too much in terms of texture and economy. Therefore, the weight ratio of the alkyl methacrylate to the unit weight of the fiber used is preferably in the range of 1.2% to 10%. In addition, the energy required for curing performed after this impregnation can be implemented as external energy such as heat, light, oxygen in the air, etc. The external energy for curing also depends on the type and properties of the fiber. It is desirable to select it appropriately depending on the situation. In general, curing by heating is the most efficient, and the heating temperature is approximately 100℃~100℃.
150℃ is suitable. Such curing causes a polymerization reaction in the methacrylic acid alkyl ester in the processing liquid to form a low polymer of the ester, but the degree of polymerization of the polymer produced by this reaction is in the range of 1200 to 2000. be. [Function] The processing liquid used in the present invention is mainly composed of a methacrylic acid alkyl ester in which the number of carbon atoms in the alkyl group ranges from 8 to 14. By impregnating fibers with this processing liquid and curing them, methacrylic acid alkyl esters with alkyl groups having 8 to 14 carbon atoms produce low polymers with a degree of polymerization in the range of 1200 to 2000 through a polymerization reaction. , which is fixed within the fiber interstices. When such a low polymerization degree methacrylic acid alkyl ester polymer is fixed to fibers and worn directly on the human body as underwear, sweat and other bad odors secreted from the human epidermis can be accurately deodorized. . Although this phenomenon is extremely unexpected, it is probably due to the linear reactive group -C=C-
When C=O- receives relatively low-temperature external energy such as body temperature, the polymerization reaction continues slowly, and at this time, the odor components of mercaptans and amines such as dimethylamine secreted from the human body are removed by this polymerization. It is assumed that it is taken up and consumed as a chain transfer agent in the reaction, thereby exerting an excellent deodorizing effect. In the deodorizing fiber of the present invention, the deodorizing component is firmly fixed to the fiber, so that it does not easily fall off during washing or impair its deodorizing effect, and its deodorizing effect is excellent. Lasting. The above methacrylic acid alkyl ester having an alkyl group having 8 to 14 carbon atoms is originally a colorless and transparent viscous liquid and is insoluble in water, but it disperses well in surfactants to form an emulsion. , itself is almost odorless and stable, and has no irritation or stickiness to the skin. Therefore, the low polymers obtained by polymerizing such monomers also have certain safety in use, and the fibers impregnated and fixed with such low degree of polymerization alkyl methacrylates also have the original properties. It is capable of fully demonstrating its deodorizing effect without impairing its texture in any way. [Examples] The present invention will be described in more detail below with reference to Examples. Example 1 Polyoxyethylene alkyl ether, a nonionic surfactant, was added as a processing aid to 10 g of lauryl methacrylate whose alkyl group has 10 carbon atoms.
100 g was added, purified water was added to bring the total to 2000 g, and the mixture was sufficiently stirred and dispersed to obtain an emulsion containing 5% lauryl methacrylate. This emulsion was used as a processing liquid, and a cotton fiber cloth was immersed in it and left for about 5 minutes. The fiber impregnated with the processing liquid was pre-dried at a temperature of 100°C for about 3 minutes, and then cured by heating for about 3 minutes in a curing chamber set at a temperature of 150°C. The degree of polymerization of the polymer fixed by this curing was approximately 1500. The obtained deodorizing fiber has a rich texture,
It was sufficiently durable to be used as underwear. Using this fiber cloth, a test for deodorization of ammonia odor was conducted according to the following test method. [Test method] First, use this fiber cloth to weigh approximately 17.0 g (approximately 40 cm x 40
cm square) test piece (No. 1) and 1/2 of it (No.
A total of three test pieces were prepared: 2), and 1/4 test pieces (No. 3). On the other hand, impregnate four pieces of filter paper with a diameter of 15 cm with 1 ml each of 25% ammonia water diluted 4 times, and apply one sheet to four 500 ml wide-mouth glass bottles. Place 1 of the above test pieces in the bottle.
The remaining one bottle was sealed as a blank test without adding any fiber cloth. After a predetermined period of time had elapsed, the seals were opened and changes in odor were investigated using a sensory test. The results are shown in Table 1.

[Table] After 24 hours, the amount of residual ammonia in each wide-mouth bottle containing the test piece was determined, and the effect was _{quantified .} (measured by alkaline titration), it was difficult to capture them as numerical values, and it was determined that they could not be recognized as traces. Example 2 To 10 g of 2-ethylhexyl methacrylate whose alkyl group has 8 carbon atoms, 100 g of polyoxyethylene alkyl ether as a processing aid and purified water were added to make a total of 2000 g, and the mixture was stirred and dispersed to form the 2-ethylhexyl methacrylate 5. An emulsion was obtained containing %. This emulsion was used as a processing liquid to impregnate four types of fiber fabrics, cotton, linen, silk, and wool, and cured according to the processing conditions of Example 1. The degree of polymerization of the polymer fixed by curing was 1500. For 17.0 g of each fiber cloth obtained, Example 1
An ammonia odor sensory test similar to the above was conducted, and a blank test was also conducted at the same time. These results are shown in Table 2.

[Table] Note that a quantitative test for residual ammonia after 24 hours was conducted in the same manner as in Example 1, but no trace could be observed. Example 3 A deodorizing processed fiber cloth was obtained from each fiber by the same treatment as in Example 2 except that tridecyl methacrylate having an alkyl group having 13 carbon atoms was used in place of 2-ethylhexyl methacrylate in Example 2. Regarding this, a similar ammonia odor sensory test was conducted. The degree of polymerization of the polymer fixed by the curing ring was 1560. The results are shown in Table 3.

[Table] A quantitative test of residual ammonia was conducted after 24 hours, but no trace could be observed. Example 4 A deodorizing processed fiber cloth of each fiber was obtained in the same manner as in Example 2 except that lauryl methacrylate having an alkyl group of 10 carbon atoms was used in place of 2-ethylhexyl methacrylate in Example 2, and the same procedure was applied to this fabric. An ammonia odor sensory test was conducted. The degree of polymerization of the polymer by curing was 1300. The results are shown in Table 4.

〔Effect of the invention〕

As detailed above, the first invention provides a low polymer with a degree of polymerization of 1200 to 2000 obtained by polymerizing one or more types of methacrylic acid alkyl esters having an alkyl group of 8 to 14 carbon atoms to a natural fiber. It is a deodorizing fiber that carries a It can exert a deodorizing effect. In the second invention, a natural fiber is impregnated with a processing liquid containing a methacrylic acid alkyl ester having 8 to 14 carbon atoms of an alkyl group, which is stable and safe as a compound, and the fiber is cured. The methacrylic acid alkyl ester is integrally fixed in the tissue as a low polymerization degree polymer with a polymerization degree of 1200 to 2000 and processed as a deodorant, thereby causing no damage to the physical properties (texture, etc.) of the fiber itself. It is possible to directly incorporate malodorous components such as human body secretions into the fibers, thereby achieving a reliable deodorizing effect.

Claims (1)

[Scope of Claims] 1. A polymer obtained by polymerizing one or more methacrylic acid alkyl esters having an alkyl group of 8 to 14 carbon atoms onto a natural single fiber or a fiber cloth woven from the single fiber. A deodorizing fiber characterized by supporting a low polymer having a molecular weight of 1,200 to 2,000. 2 Impregnating natural single fibers or fiber cloth made of woven single fibers with a processing liquid containing one or more methacrylic acid alkyl esters having an alkyl group of 8 to 14 carbon atoms as a curing agent. Therefore, the monofilament or fiber cloth has a polymerization degree of 1200~
1. A method for producing deodorizing fibers, which comprises fixing a methacrylic acid alkyl ester polymer with a low polymerization degree of 2000.