TWI553187B - Fiber for improving discoloration resistance and fiber molded body composed of the same - Google Patents

Description

Fiber for improving discoloration resistance and fiber molded body composed of the same

The present invention relates to a fiber excellent in discoloration resistance and liquid absorbing property. Further, the present invention relates to a fiber molded body using a fiber excellent in discoloration resistance and liquid absorbing property, for example, a nonwoven fabric.

The heat-fusible fiber which can be formed by heat welding is easy to use heat energy such as hot air or a heat roller to obtain a non-woven fabric having high safety and good hand feeling, and is widely used for sanitary materials such as diapers, sanitary napkins, and absorbent pads, or Industrial materials such as daily necessities or filters. In particular, when it is used for a sanitary material, it is required to quickly and repeatedly absorb liquid such as urine or menstrual blood, so that high liquid absorbency is required.

On the other hand, in the heat-fusible fiber obtained by the above method, in order to prevent deterioration caused by the generation of radicals, an antioxidant such as dibutylhydroxytoluene is added, and if it is exposed to sunlight or firefly When the light is stored for a long period of time or the like, the following problems occur frequently, that is, discoloration is likely to occur, and the quality of the product is impaired.

Therefore, there is a proposal to improve discoloration resistance by adding a hydroxycarboxylic acid to a fiber treatment agent attached to the surface of the fiber (for example, Patent Document 1). Further, there is a proposal to prevent yellowing which occurs during the production of fibers or during storage by using an alkyl ammonium phosphate for a fiber treating agent (for example, Patent Document 2).

On the other hand, it has been proposed to increase the water repellency of the nonwoven fabric or the like by using a fiber treatment agent containing a predetermined component (for example, Patent Document 3 and Patent Document 4).

[Previous Technical Literature]

[Patent Literature]

[Patent Document 1] Japanese Patent No. 4381579

[Patent Document 2] Japanese Patent Laid-Open Publication No. 2001-140168

[Patent Document 3] Japanese Patent Laid-Open Publication No. 2002-161477

[Patent Document 4] Japanese Patent Laid-Open Publication No. 2003-239172

Although there is a proposal to improve the discoloration resistance of fibers by the prior art, the hydroxycarboxylic acid has a low function of imparting hydrophilicity, and thus it may hinder the liquid absorbing property of the fibers. Further, the alkyl ammonium phosphate has a problem that the function of imparting durable hydrophilicity is low, and it is difficult to obtain high durability hydrophilicity.

Here, the liquid absorbing property refers to an ability to contact (drop, etc.) urine from the side of the nonwoven fabric or the like in a state in which a fiber molded body such as a nonwoven fabric is placed on an absorbent layer such as a pulp sheet or the like. When a liquid such as blood is passed through, the liquid is rapidly transferred to the absorption layer. This liquid absorbency is also called liquid permeability, liquid permeability, and the like. In addition, the term "permanent hydrophilicity" as used herein means repeated liquid absorption.

In view of such a problem, an object of the present invention is to provide a fiber and a fiber molded body which are extremely excellent in discoloration resistance and have high liquid absorbency and high durability and hydrophilicity, and in particular, a nonwoven fabric.

As a result of intensive studies, the inventors of the present invention have found that the above-mentioned problems are achieved by adhering the following fiber treating agent to the fiber, and the fiber treating agent contains a metal phosphate alkyl salt and a trialkyl glycan in a predetermined amount. An amine derivative and a hydroxycarboxylic acid.

Therefore, the present invention has the following constitution.

[1] A fiber comprising at least one thermoplastic resin as a main component, wherein the fiber is treated by adhering to a component (A), a component (B), a component (C), and a component (D) comprising the following components (D); The composition ratio of each of the component (A), the component (B), and the component (C) is 3% by mass or more and less than 10% by mass based on the active ingredient of the fiber treating agent, and the component (D) The composition ratio is 40% by mass to 60% by mass, and the composition ratio (% by mass) of the component (A) and the component ratio (% by mass) of the component (C) satisfy the component (C) ≦ component (A).

Ingredient (A): an alkyl phosphate metal salt having an alkyl group having a carbon number of less than 10

Ingredient (B): Trialkylglycine derivative

Ingredient (C): Hydroxycarboxylic acid

Component (D): an alkyl phosphate metal salt having an alkyl group having 10 to 14 carbon atoms.

[2] The fiber according to the above [1], wherein the fiber treatment agent comprises the following component (E) in a composition ratio of 10% by mass to 20% by mass based on the active ingredient of the fiber treating agent; And the component (F) is contained in a composition ratio of 15% by mass to 25% by mass,

Ingredient (E): polyoxyalkylene modified ketone

Component (F): a compound which is an ester of an alkylene oxide adduct of hydroxystearic acid ester with maleic acid and which blocks a hydroxyl group of the ester with a monocarboxylic acid having 10 to 22 carbon atoms.

[3] A fiber formed body comprising the fiber according to the above [1] or [2] as a main component.

[4] The fibrous formed body according to [3] above, which is a nonwoven fabric.

According to the present invention, by attaching a fiber treating agent containing a metal phosphate alkyl salt, a trialkylglycine derivative, and a hydroxycarboxylic acid in a predetermined amount to the fiber, it is possible to obtain excellent liquid absorbency and A fiber that is durable in hydrophilicity and excellent in discoloration resistance. Further, a fiber molded body having excellent liquid absorbability and durable hydrophilicity and having excellent discoloration resistance, such as a nonwoven fabric, can be obtained.

According to the present invention, it is possible to achieve a better coexistence of liquid absorbing property, durable hydrophilicity, and discoloration resistance in the fiber and the fiber molded body.

Hereinafter, the present invention will be described in more detail.

The component (A) constituting the fiber treating agent attached to the fiber of the present invention is an alkyl phosphate metal salt having an alkyl group having a carbon number of less than 10. The carbon number of the alkyl group is preferably 4 to 8, more preferably 6 to 8. As the metal salt, an alkali metal salt can be exemplified. Examples of the alkali metal salt include a sodium salt, a potassium salt, and a lithium salt. Among them, a potassium salt is preferred.

Component (B) constituting the fiber treating agent attached to the fiber of the present invention is a trialkylglycine derivative, and is a four-stage having three alkyl groups bonded to a nitrogen atom in a glycine acid molecular structure. An intramolecular salt of ammonium and a carboxyl group, a compound of the so-called betaine structure. The carbon number of the alkyl group is arbitrarily selected from 1 to 22, and particularly preferably, the two alkyl groups are a lower alkyl group having a carbon number of 4 such as a methyl group or an ethyl group, and one having a carbon number of 12 or more. Long chain alkyl group. Specific examples of the trialkylglycine derivative include dimethyloctadecylglycine hydroxide, heptadecyl imidazolium hydroxyethylglycine hydroxide, and the like.

The component (C) constituting the fiber treating agent attached to the fiber of the present invention is a hydroxycarboxylic acid. Examples of the hydroxycarboxylic acid include citric acid, lactic acid, tartaric acid, malic acid, and glycolic acid, and particularly preferred is citric acid.

In the fiber treatment agent active ingredient, the composition ratio of each of the component (A), the component (B), and the component (C) constituting the fiber treatment agent adhering to the fiber of the present invention is 3% by mass or more and less than 10% by mass. . More specifically, the composition ratio (% by mass) of the component (A) and the component (C) must satisfy the component (C) ≦ component (A). Furthermore, it is more preferable that the composition ratio (% by mass) of each component of the component (A), the component (B), and the component (C) satisfies the component (C) ≦ component (B) ≦ component (A).

The hydroxycarboxylic acid of the component (C) has an effect on discoloration resistance. When the composition ratio of the hydroxycarboxylic acid of the component (C) is 3% by mass or more and less than 10% by mass, the effect of the discoloration resistance is sufficient, and the liquid absorbability is not extremely lowered. The composition ratio of the hydroxycarboxylic acid of the component (C) is preferably from 3% by mass to 5% by mass.

Since the hydroxycarboxylic acid of the component (C) is added as a constituent component to the fiber treating agent, the liquid absorbing property of the fiber treating agent tends to decrease. Therefore, the component (A) is required as a component for compensating for the liquid absorbing property. The alkyl phosphate has a carbon number of less than 10 alkyl phosphate salts. The alkyl phosphate metal salt having an alkyl group having less than 10 carbon atoms is a component for maintaining and improving liquid absorbency. The composition ratio of the fiber treatment agent active ingredient is 3% by mass or more and less than 10% by mass. The component (A) is in this range without impairing the durable hydrophilicity, and more preferably a composition ratio of 5% by mass or more and less than 10% by mass.

The relationship between the alkylation ratio of the alkyl phosphate of the alkyl group of the component (A) constituting the fiber treatment agent and the hydroxycarboxylic acid of the component (C) is as described above, and the component (A) In order to compensate for the decrease in the liquid absorbability caused by the addition of the component (C), the relationship between the component (C) and the component (A) component ratio (% by mass) must be changed to the component (C) component (A).

The trialkyl hydroxyglycine derivative of the component (B) is a component that imparts durable hydrophilicity, and the composition ratio thereof is 3% by mass or more and less than 10% by mass based on the active ingredient of the fiber treating agent. This component (B) is a component which compensates for the decline of the durable hydrophilicity by the metal phosphate of the addition of the component (A). By the component (B) being the above-mentioned composition ratio, it is possible to impart good durability to hydrophilicity, and further, the discoloration resistance is not lowered. The component (B) is more preferably a composition ratio of 3% by mass to 7% by mass.

In the fiber treatment agent attached to the fiber of the present invention, the trialkylhydroxyglycine derivative of the component (B), the alkyl phosphate of the alkyl group of the component (A) having less than 10 carbon atoms, In the relationship between the composition ratio of the hydroxycarboxylic acid of the component (C), the composition ratio (% by mass) of each component is more preferably the component (C) ≦ component in terms of discoloration resistance, liquid absorbing property, and durable hydrophilicity. (B) ≦ component (A).

Further, the above-mentioned effective ingredient means a component obtained by removing moisture from the entire fiber treatment agent.

The component (D) constituting the fiber treating agent attached to the fiber of the present invention is an alkyl phosphate metal salt having an alkyl group having 10 to 14 carbon atoms. The component (D) is a component that imparts liquid absorbency and antistatic property, similarly to the component (A). However, since the carbon number is larger than the component (A), it has a surface of the lifted fiber in addition to the liquid absorbency. The smoothness or the function of a component that imparts durable hydrophilicity. Since the carbon number of the alkyl group is in the range of 10 to 14, the liquid absorbability is not greatly lowered. As the metal salt, an alkali metal salt can be exemplified. Examples of the alkali metal salt include a sodium salt, a potassium salt, and a lithium salt. Among them, a potassium salt is preferred.

The composition ratio of the alkyl phosphate metal salt of the component (D) to the active component of the fiber treatment agent is in the range of 40% by mass to 60% by mass, more preferably in the range of 45% by mass to 55% by mass.

Specific examples of the fiber of the present invention include a fiber to which a fiber treatment agent is added, and the fiber treatment agent contains the following components in a composition ratio of 10% by mass to 20% by mass based on the active ingredient. (E) and the component (F) is contained in a composition ratio of 15% by mass to 25% by mass.

The component (E) constituting the fiber treating agent attached to the fiber of the present invention is a polyoxyalkylene modified fluorenone, and is preferably represented by the following formula.

(wherein R represents a methylene group, a propyl group, an N-(aminomethyl)methylimino group, or an N-(aminopropyl)propylimino group, and X represents a polyoxyalkylene group. n and m are represented by an integer in the range of 20% by mass to 70% by mass of Si and a molecular weight of 1,000 to 100,000.

The Si content in the modified fluorenone is 20% by mass to 70% by mass, and as the polyoxyalkylene group, a polyoxyalkylene group, a polyoxyalkylene group, a polyoxybutylene group, and the like are exemplified. In the case where the monomer is copolymerized, the polyoxyalkylene group is contained in an amount of at least 20% by mass or more based on the polyoxyalkylene group. Further, from the viewpoint of imparting hydrophilicity, those having a molecular weight of 1,000 to 100,000 are preferable, and those having a molecular weight of 7,000 to 15,000 are particularly preferable. The composition ratio of the component (E) in the fiber treatment agent is suitably 10% by mass to 20% by mass. When the composition ratio of the component (E) is from 10% by mass to 20% by mass, sufficient hydrophilicity is exhibited and rapid water permeability can be obtained, and the amount of liquid reflux can be suppressed, and the durable hydrophilicity is not lowered, and it is difficult to be obtained. The peeling of the treatment agent from the fibers caused by water permeable or the like occurs.

The component (F) constituting the fiber treating agent attached to the fiber of the present invention is an ester of an alkylene oxide adduct of hydroxystearic acid glyceryl ester with maleic acid, and a monovalent having a carbon number of 10 to 22. A compound in which the carboxylic acid blocks the hydroxyl group of the ester. The alkylene oxide adduct of hydroxystearic acid glyceride can be obtained by subjecting an ester of glycerin and hydroxystearic acid containing a polyhydric alcohol to an alkylene oxide. The component (F) is an ester of the compound and maleic acid, and the reaction molar ratio is preferably 1.5:1.0 to 2.0:1.0, and the hydroxyl group of the ester is 10 to 22 by lauric acid or stearic acid. The monocarboxylic acid is blocked.

The component (F) has a large molecular weight, and by this action, durability is imparted to the treatment agent, and it is possible to suppress other components having high hydrophilicity from falling off from the surface of the fiber due to water permeation or the like. The composition ratio of the component (F) in the fiber treatment agent is suitably 15% by mass to 25% by mass. When the composition ratio of the component (F) is within this range, the durable hydrophilicity is good, and the hydrophilicity of the treating agent is maintained. The resistance to aspiration does not increase.

In the fiber or fiber molded body of the present invention, for example, in the nonwoven fabric, it is preferable that 0.1% by mass to 1.0% by mass of the active ingredient of the fiber treating agent adheres to the fiber mass, and preferably 0.3% by mass to 0.8% is adhered. % by mass of the active ingredient of the above fiber treating agent. When the amount of adhesion is 0.1% by mass or more based on the fiber, the following tendency is preferable, and the antistatic property is sufficient, and the fiber having the fiber treatment agent adhered to the fiber molded body such as a nonwoven fabric is not processed. Static electricity is generated and processing becomes easy. In addition, when the amount of adhesion is 1.0% by mass or less, in the step of processing the fiber, the fiber treatment agent is less likely to fall off from the fiber, and the accumulation toward the machine does not increase, and the workability is not deteriorated, which is preferable.

As a form in which the fiber treatment agent is adhered to the fiber, the fiber treatment agent may be attached to the fiber, and the fiber may be processed into a fiber molded body as necessary. Alternatively, the fiber treating agent may be attached to the fiber formed body after the fiber is processed into a fiber formed body.

The fiber molded body of the present invention, for example, a nonwoven fabric, may be produced by processing a fiber to which the fiber treating agent is attached, and processed by an appropriate step, or may be processed by fiber by attaching the fiber treating agent to an appropriate step. The obtained fiber molded body is produced on the surface. When the fiber treating agent is attached to a fiber molded body such as a nonwoven fabric, it is of course necessary to uniformly adhere the fiber treating agent to the entire fiber molded body, and if necessary, it can be attached to an arbitrary portion, and each of the adhered portions can be attached. Part of the amount of adhesion produced a difference.

Specifically, the fiber treatment agent can be attached to a fiber molded body such as a fiber or a non-woven fabric in an emulsion state, and the emulsion is made of ion-exchanged water or the like. The fiber treatment agent is diluted to a concentration of 3 to 30% by mass. The fiber treating agent may be attached to the step of producing the fiber, that is, the so-called spinning step, the stretching step, and the crimping step, or after the fiber is processed into the fiber formed body, for example, the fiber is not woven to make the adhesion. The amount of the treatment agent is applied to the nonwoven fabric in such a manner that the amount becomes a desired range. As a method of attaching the fiber treating agent to the fiber, a known method such as an oil coating roll method, a dipping method, or a spray method can be used. In addition, as a method of attaching a fiber treatment agent to, for example, a nonwoven fabric, an oil-coated roll method (coating method), a dipping method, a spray method, or the like may be mentioned, and in order to improve the adhesion efficiency or the fixing property, the non-woven fabric may be electrically charged. A halo discharge treatment or a normal piezoelectric discharge treatment is used as a pretreatment.

When adjusting the amount of adhesion of the fiber treatment agent to the fiber or the fiber molded body, when the fiber treatment agent is adhered by a roller such as an oil application roller, the fiber treatment agent can be adjusted by the rotation speed of the roller or the like, and the fiber treatment agent can be attached by a spray method. In time, it can be adjusted by the amount of spray or the like.

As a method of quantitatively confirming the amount of the fiber treatment agent attached to the fiber, there is an extraction method using a solvent. A fixed amount of the fiber or the fiber molded body is immersed in a solvent capable of dissolving the fiber treating agent to be adhered, for example, methanol, ethanol, 2-propanol or the like, and then only the solvent is volatilized by heat or the like, and weighed. The residual amount thereof can thereby confirm the amount of adhesion of the fiber treatment agent per unit mass. Specifically, a rapid method or a Soxhlet method can be cited.

In the fiber treatment agent attached to the fiber of the present invention, other known surfactant components can be used without departing from the effects of the present invention. Examples of the surfactant component include antibiotics such as sodium alkanesulfonate. A nonionic component such as an electrostatic agent or sorbitan ester.

Further, in the fiber treatment agent attached to the fiber of the present invention, various additives can be formulated within a range that does not impair the effects of the present invention. Examples of the additive include an emulsifier, a preservative, a rust preventive, a pH adjuster, and an antifoaming agent.

The fiber of the present invention may be a single component fiber or a composite fiber. The thermoplastic resin constituting the fiber is not particularly limited, and examples thereof include high density polyethylene, linear low density polyethylene, low density polyethylene, polypropylene (propylene homopolymer), and ethylene-propylene having propylene as a main component. Copolymer, ethylene-propylene-1-butene copolymer containing propylene as a main component, polybutene-1, polyhexene-1, polyoctene-1, poly-4-methylpentene-1, polymethyl Polyolefin resins such as pentene, 1,2-polybutadiene, 1,4-polybutadiene, or polyethylene terephthalate, polytrimethylene terephthalate, poly(p-phenylene terephthalate) A polyester resin such as butylene dicarboxylate, polylactic acid, polybutylene succinate or polybutylene terephthalate or a copolymerized polyester (copolyester). It may be a fiber containing a mixture containing two or more kinds of the above thermoplastic resins.

In the case of the conjugate fiber, a conjugate fiber having a cross-sectional structure of a concentric sheath core structure, an eccentric sheath core structure, or a side-by-side structure, or a split type composite fiber such as an alternate radial shape may be used. Examples of the shape of the fiber include a circle, a star, an ellipse, a triangle, a quadrangle, a pentagon, a multilobal, a hollow, and the like. Further, as a specific resin combination of the conjugate fiber (as a sheath/core or a combination of a low melting point component/high melting point component), high density polyethylene/polypropylene, low density polyethylene/propylene, ethylene-octane may be mentioned. Ene copolymer/polypropylene, ethylene-propylene copolymer/polypropylene, ethylene-propylene-butene-1 copolymer / polypropylene, high density polyethylene / polyethylene terephthalate, ethylene-octene copolymer / polyethylene terephthalate, ethylene - propylene - butene -1 copolymer / poly-p-phenylene Ethylene formate, polypropylene/polyethylene terephthalate, high density polyethylene/polybutylene terephthalate, polylactic acid/polybutylene succinate, and the like. The ratio of the sheath/core or the low melting point component/high melting point component is preferably in the range of 10/90 to 90/10 in terms of mass ratio, and is particularly preferable from the viewpoints of spinnability, elongation, and nonwoven fabric processability. It is in the range of 30/70~70/30.

In the thermoplastic resin constituting the fiber of the present invention, an additive such as an antioxidant, a light stabilizer, an ultraviolet absorber, a neutralizing agent, or a nucleating agent may be added as needed within a range that does not impair the effects of the present invention.

Further, in the fiber of the present invention, an antibacterial agent, a flame retardant, a smoothing agent, an antistatic agent, a pigment, and inorganic fine particles for imparting flexibility can be appropriately added as needed within a range that does not impair the effects of the present invention. Examples of the method of addition include a method of directly adding the powders, a method of incorporating the powder after the mother granulation, and the like. The resin used for the mother granulation is preferably the same as the thermoplastic resin constituting the fiber. However, it is not particularly limited as long as the requirements of the present invention are satisfied, and different resins may be used.

The fiber of the present invention can be preferably obtained by, for example, a melt spinning method or a spunbonding method using a resin containing the above thermoplastic resin. In the case of short fibers, it can be obtained by obtaining a non-stretched fiber by a melt spinning method, partially aligning crystallization in an extending step, and then imparting a crimp in the crimping step, followed by using a hot air. The dryer or the like is subjected to a heat treatment at a predetermined temperature for a fixed period of time, and then cut into an arbitrary length.

The fineness of the fiber of the present invention is not particularly limited, but is preferably 0.3 dtex. From the viewpoint of the process of processing the fiber into a non-woven fabric, it is preferably from 1.0 dtex to 8.0 dtex, and more preferably from 1.2 dtex to 6.0 dtex.

The fiber length of the fiber of the present invention is not particularly limited, and can be arbitrarily determined in each method of making the fiber into a nonwoven fabric. For example, in the case of forming a short fiber of a fiber web using a Roller Card, the fiber length of the fiber is preferably from 25 mm to 125 mm, more preferably from 38 mm to 76 mm. Further, in the case of using an air-jet machine, the fiber length is preferably from 3 mm to 25 mm, more preferably from 3 mm to 12 mm.

The method of processing the fiber into a nonwoven fabric is not particularly limited. However, it is preferred to use a method in which heat treatment is performed to thermally bond the entangled dots of the fibers constituting the fiber web to form a nonwoven fabric. Examples of the method of forming the fiber web include a carding method passed through a roller card, an air spinning method formed by air, a spun bonding method in which a long fiber layer is laminated, and the like. As a method of heat-treating the fiber web to thermally bond it, a hot air circulation type dryer, a hot air vent type heat treatment machine, a relaxation type hot air dryer, a hot plate pressure type dryer, a drum type dryer, and infrared drying can be used. A well-known person such as a machine or a partial thermocompression bonding machine.

The basis weight (mass per unit area) of the nonwoven fabric when the fiber of the present invention is processed into a nonwoven fabric is not particularly limited, and can be determined depending on the intended use. For example, in the case of a disposable diaper or a sanitary napkin, the surface material is preferably 10 g/m ² to 50 g/m ² , more preferably 20 g/m ² to 35 g/m ² .

The fiber formed body of the present invention is also included in addition to the non-woven fabric as described above. A fiber bundle, a fiber web, a fiber laminate, a mesh, a woven fabric, and a heat treatment to form a sheet or a block, a non-woven fabric layered or wavy, and a heat treatment is performed twice. The winner and so on. As the fiber molded body of the present invention, a nonwoven fabric is particularly exemplified.

Examples of the fiber product using the fiber or the fiber molded body of the present invention, such as a non-woven fabric, include absorbent articles such as diapers, sanitary napkins, and incontinence pads, medical and sanitary materials such as surgical gowns and surgical gowns, wall panels, shoji paper, and flooring. Such as interior decoration materials, cloth, cleaning rags, water-containing garbage covers and other life-related materials, disposable toilets, toilet covers and other toilet products, pet mats, pet diapers, pet towels and other pet supplies, wiping materials Industrial materials such as filters, buffer materials, oil adsorbent materials, and adsorbent materials for ink tanks, general medical materials, sleeping materials, and care products. The fibers or fiber shaped bodies of the present invention can be used in a variety of fiber products.

[Example]

Hereinafter, the present invention will be described in detail by way of examples, but the invention is not limited by the examples. In addition, the manufacturing, processing, measurement, and test in each example were performed by the method shown below.

<Example 1 to Example 9 and Comparative Example 1 to Comparative Example 5>

(thermoplastic resin)

The following resin was used as the thermoplastic resin constituting the fiber.

Resin 1: High density polyethylene (abbreviated as PE-1) having a density of 0.96 g/cm ³ , MFR (190 ° C load 21.18 N) of 16 g/10 min, and melting point of 130 ° C

Resin 2: high density polyethylene (abbreviated as PE-2) having a density of 0.96 g/cm ³ , MFR (190 ° C load 21.18 N) of 41 g/10 min, and melting point of 130 ° C.

Resin 3: MFR (230 ° C load 21.18 N) is 16 g/10 min, melting point of 162 ° C polypropylene (abbreviated PP-1)

Resin 4: MFR (230 ° C load 21.18 N) of 28 g/10 min, melting point of 162 ° C polypropylene (abbreviated PP-2)

Resin 5: MFR (230 ° C load 21.18 N) of 11 g/10 min, melting point of 162 ° C polypropylene (abbreviated PP-3)

Resin 6: an ethylene-propylene-butene-1 copolymer having an MFR (230 ° C load: 21.18 N) of 16 g/10 min, a melting point of 131 ° C, an ethylene content of 4.0% by weight, and a 1-butene content of 2.65 wt%. (abbreviation co-PP)

(Measurement of Melt Mass-Flow Rate (MFR))

The melt mass flow rate was measured in accordance with JIS K 7210. Here, the melt flow index (Melt Index, MI) is measured according to Condition D (test temperature 190 ° C, load 2.16 kg) of Table 1 of Attachment A, and MFR is based on Condition M (test temperature 230 ° C, load 2.16 kg) ) Perform the measurement.

(manufacture of fibers)

As shown in the following Tables 1 and 2, the spinning nozzle having a cross section of a concentric sheath core type is used, and the extrusion amount is adjusted so that the volume ratio of the fiber cross section becomes 50/50 at a predetermined extrusion temperature. The thermoplastic resin is melt-spun to obtain unstretched fibers. At this time, the fiber treatment agents shown in Tables 1 and 2 were used as an emulsion, and adhered to the fibers by an oil application roller. The obtained unstretched fiber was extended to 2.2 dtex by a hot roll at 90 ° C, and after being crimped, it was dried by a hot air circulation type dryer. After that, it was cut into 51 mm by a cutter to obtain short fibers.

Further, as shown in the column of the form when the fiber treating agent of Tables 1 to 2 was attached, Examples 1 to 7 and Comparative Examples 1 to 4 were examples in which the fiber treating agent was attached to the fiber, and Example 8 and Example 9 and Comparative Example 5 are examples in which a fiber treatment agent was attached to a nonwoven fabric as will be described later.

(composition of fiber treatment agent)

The composition of the fiber treatment agent used in each example is shown in Tables 1 to 2. The unit of the composition is % by mass, and the total amount of the active ingredients in the fiber treatment agent is set to 100% by mass.

The components of the fiber treating agent in Tables 1 to 2 are indicated by the following symbols.

A: potassium octyl phosphate salt

B: dimethyl octadecyl glycinate

C: citric acid

D1: potassium lauryl phosphate

D2: tridecyl phosphate potassium salt

E: polyoxyethylene modified fluorenone

F: polyoxyethylene (20 mol) ramie wax maleate (2:1 molar ratio) ester with stearic acid (2:1 molar ratio)

(non-woven processing)

In Examples 1 to 7 and Comparative Examples 1 to 4, the short fibers obtained in the above steps were formed into a fiber web by a roller card testing machine (manufactured by Daiwa Machine Co., Ltd.), and then suction type was used. The dryer was heat-bonded by the gas permeable processing (codes TA in Table 1 and Table 2) shown in Tables 1 to 2 to obtain a basis weight of about 23 ± 2 g. /m ² non-woven.

<Example 8, Example 9, and Comparative Example 5>

In the case of the above-mentioned fiber, a short fiber obtained by attaching a fiber treating agent to a fiber web was produced by a roller card testing machine (manufactured by Daiwa Mako Co., Ltd.), and then a suction type was used. The dryer was heat-bonded by a gas permeable process (code TA) as described in Table 2 to obtain a nonwoven fabric having a basis weight of about 23 ± 2 g/m ² .

Further, in Example 9 and Comparative Example 5, the resin described in Table 2 was used, and a spunbonded nonwoven fabric was obtained by a spunbonding method. Specifically, using a spinning nozzle having a cross section of a concentric sheath core type, the extrusion amount is adjusted so that the volume ratio of the fiber cross section becomes 50/50 at the extrusion temperature described in Table 2, and then The composite long fiber group sprayed from the spinning nozzle is introduced into an air sucker for index extension to form a fiber diameter of 2.2 dtex, and then the charging device is used to apply the same electric charge to the long fiber group discharged from the air suction cup. After charging, the long fiber group is caused to collide with the reflecting plate to be opened, and then the endless mesh conveyor is provided on the back side with the suction device, and the opened long fiber group is collected as a long fiber web, and then the line pressure is used. An embossing roll (protrusion)/smooth roll of 80 N/mm and a pressure-bonding area ratio of 21% was subjected to partial thermocompression bonding (abbreviated as PB in Table 2) to obtain a basis weight of about 23 ± 2 g/m. ² non-woven fabrics.

These nonwoven fabrics were immersed in the emulsion of the fiber treatment agent shown in Table 2, and then dehydrated and dried so as to have a predetermined adhesion amount.

(Measurement amount of treatment agent)

In the case of a short fiber to which a fiber treating agent is attached in the step of producing a fiber, 2 g of the fiber is formed into a fiber web by a roller card tester, and a rapid residual fat extraction device (Donghai Jiji ( The "R-II type" manufactured by the company was measured. When the fiber treatment agent was adhered after being processed into a nonwoven fabric, the measurement was carried out using a nonwoven fabric 2g. 25 ml of methanol was used as an extraction solvent. The amount of adhesion was calculated by the following formula.

The amount of the treatment agent (% by mass) = the amount of extraction (g) ÷ 2 × 100

(color resistance test)

In the case of a short fiber in which a fiber treating agent is adhered in the step of producing a fiber, the fiber is formed into a card web by a roller card tester, and then the net weight is made by a needle punching method. A nonwoven fabric of 200 ± 20 g/m ² was cut into a longitudinal length of 8 cm × a width of 8 cm as a test sample.

When the fiber treatment agent is applied after being processed into a nonwoven fabric, the nonwoven fabric is cut into a length of 80 cm × a width of 80 cm, and the total weight per unit area is 200 ± 20 g/m ² , and the superimposed one is used as a superimposed one. Test sample. The test sample was placed 80 cm above the kerosene stove fire source (ambient temperature 100 ± 5 ° C) and exposed to the combustion gas for 3 hours, and then the sample was taken out. The value of the yellow index (YI) of the surface of the test sample before and after the test was measured by a color difference meter ("Model SM-4" manufactured by Suga Test Instruments), and ΔYI as the difference was calculated.

Furthermore, regarding the test results, if the value of ΔYI is 6 or less, it is resistant. Since the discoloration property is very excellent, it is referred to as "A". In addition, if it is a numerical value of 7-8, it is described as "B", and if it is a numerical value of 9 or more, it can be said that the discoloration property is high, and it is called "C".

(absorption test)

The aspiration test was carried out according to NONWOVENS (non-woven fabric) / LIQUID STRIKE-THROUGH TIME (liquid permeation time) according to EDANA RECOMMEND TEST METHODS. In addition, it was repeated 3 times to test the durability hydrophilicity. As a test device, "Lister" of Lenzing Instruments was used. As the test sample, those which were processed into a nonwoven fabric and cut into a length of 100 mm × a width of 100 mm were used. As filter paper (absorbent paper), "Kimtowel Wiper (white) (made by Crecia)" was used.

Further, the results of the liquid absorption test are expressed in three stages according to the time required for the liquid absorption.

[Pneumatic processing of short fibers to make non-woven fabrics]

When it is 0.5 sec or less, the liquid absorbing property is very excellent and it is set to "A".

If it is more than 0.5 sec and less than 1.0 sec, it is set to "B".

When it is 1.0 sec or more, the liquid absorbing property is not good and it is set to "C".

[Partial thermocompression bonding using spunbonding method to make non-woven fabrics]

When it is 1.5 sec or less, the liquid absorbing property is very excellent and it is set to "A".

If it is more than 1.5 sec and less than 2.0 sec, it is set to "B".

When it is 2.0 sec or more, the liquid absorbing property is not good and it is set to "C".

The result of the third liquid absorption test is used as an index of durable hydrophilicity, and is expressed in three stages according to the time required for liquid absorption as follows.

[Pneumatic processing of short fibers to make non-woven fabrics]

When it is 1.5 sec or less, durability hydrophilicity is very excellent and it is set to "A".

If it is more than 1.5 sec and less than 2.0 sec, it is set to "B".

When it is 2.0 sec or more, durability and hydrophilicity are not good, and it is set to "C".

[Partial thermocompression bonding using spunbonding method to make non-woven fabrics]

When it is 3.0 sec or less, durability hydrophilicity is very excellent and it is set to "A".

If it is more than 3.0 sec and less than 4.0 sec, it is set to "B".

When it is 4.0 sec or more, durability and hydrophilicity are not good, and it is set to "C".

For each of the examples and the comparative examples, the conditions for obtaining the fibers and the non-woven fabric using the fibers and the properties of the nonwoven fabrics according to the above test and measurement methods are shown in Tables 1 and 2 below.

[Industrial availability]

The fiber of the present invention has excellent discoloration resistance and liquid absorbing property by adhering to a fiber treatment agent containing a metal phosphate alkyl salt, a trialkylglycine derivative, and a hydroxycarboxylic acid in a predetermined amount. Durable hydrophilic fiber. In the practice of the present invention, the polyoxyalkylene alkyl ester is further modified, and the alkylene oxide adduct of hydroxystearic acid glyceryl ester is esterified with maleic acid. A compound which blocks a hydroxyl group of the ester with a monocarboxylic acid is attached as an active ingredient of the fiber treating agent, whereby a better fiber can be provided.

Further, the fiber molded body such as a nonwoven fabric comprising the fiber of the present invention has high liquid absorbency and high durability hydrophilicity, and is extremely excellent in discoloration resistance, so that it can be advantageously used for absorbent articles such as diapers, sanitary napkins, and incontinence pads. Medical gowns such as surgical gowns and surgical gowns, interior decorative materials such as wall panels, shoji paper, flooring, etc., living materials related to covering, cleaning rags, water-containing garbage covers, disposable toilets, toilet covers, etc. Products, pet mats, pet diapers, pet towels and other pet supplies, wiping materials, filters, cushioning materials, oil adsorption materials, ink tank adsorption materials and other industrial materials, general medical materials, sleeping materials, care products, etc. The use of fiber products.

Claims (3)

A fiber comprising at least one thermoplastic resin as a main body, which is a fiber to which a fiber treating agent comprising the following component (A), component (B), component (C), and component (D) is attached The composition ratio of each of the component (A), the component (B), and the component (C) is 3% by mass or more and less than 10% by mass based on the active ingredient of the fiber treating agent, and the component ratio of the component (D) is 40% by mass to 60% by mass, and the composition ratio (% by mass) of the component (A) and the component ratio (% by mass) of the component (C) satisfy the component (C) ≦ component (A), component (A): alkyl group Alkyl phosphate component having a carbon number of less than 10 (B): a trialkylglycine derivative component (C): a hydroxycarboxylic acid component (D): an alkyl group having a carbon number of 10 to 14 In the alkyl ester metal salt, the fiber treatment agent contains the following component (E) and 15 mass% to 25 mass in a composition ratio of 10% by mass to 20% by mass based on the active ingredient of the fiber treating agent. The composition ratio of % comprises component (F), component (E): polyoxyalkylene alkyl modified anthrone component (F): ester of alkylene oxide adduct of hydroxystearic acid ester with maleic acid And use A compound in which a monocarboxylic acid having a carbon number of 10 to 22 blocks the hydroxyl group of the ester. A fiber molded body comprising the fiber according to the first aspect of the patent application as a main body. The fibrous formed body according to claim 2, which is a non-woven fabric.