JPH05111509A - Absorptive material - Google Patents

Abstract

PURPOSE:To apply hydrophilic treatment which is safe for a body and inexpensive and has good productivity and durability by providing a hydrophilic material stuck with a surfactant having a long-chain alkyl group indicated by the specific structural formula and a carbohydrate skeleton on polyolefin nonwoven fabric or a polyolefin porous film. CONSTITUTION:A surfactant having a long-chain alkyl group indicated by the formula and a carbohydrate skeleton is contained 0.1-0.4wt.% in polyolefin nonwoven fabric or a polyolefin porous film to apply the hydrophilic property, where R indicates the long-chain alkyl group (8-22C in straight chain or branch), X indicates a hydrophilic group such as (CH2CH2O)nH, (CH2CH2O)nSO3M, (n) is 0-6, and M indicates an alkali metal such as Na, K. An absorption body is covered with the polyolefin nonwoven fabric or the polyolefin porous film applied with hydrophilic treatment. The hydrophilic treatment which is safe for a body and inexpensive and has good productivity and durability can be applied.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an absorbent article, and more particularly to an absorbent article such as a paper diaper or a sanitary napkin which uses a nonwoven fabric made of polyolefin-based composite fibers or a polyolefin film having pores as a material. ..

[0002]

2. Description of the Related Art Generally, avoiding discomfort caused by sweating, urine, body fluids, etc. when wearing hygiene products such as paper diapers and napkins is due to the fact that the surface materials of those products are easily wetted and their wettability is short. It is considered important to be exerted in time. In recent years, polyolefin-based materials, such as polyolefin-based fibers and polyolefin films having open pores, have been used as materials for these paper diapers, especially as a surface material. I can't get wet easily.

In addition, a disposable diaper or the like is worn by an infant, an aged person, a sick person or the like who cannot process excrement by himself, or because the absorbent capacity is increased and the leakage prevention performance is improved, it is not necessary to wear it once. The excrement is not always treated, and it is necessary to avoid discomfort caused by excretion several times, and there is a strong demand for the durable hydrophilicity (sustaining hydrophilicity).

Further, recently, for the purpose of improving the absorption performance of the absorbent body, it has been attempted to form the cellulose pulp by mixing or laminating hydrophilically modified polyolefin fibers, and also in this case, durable hydrophilicity is obtained. There is a strong demand. The following methods (1) to (5) are known as techniques for imparting hydrophilicity to the above hydrophobic material.

(1) Kneading a hydrophilizing agent into a hydrophobic resin,
A method of obtaining a hydrophilic fiber aggregate or molding a film having a surface-hydrophilized surface using spun fibers. As this method, a method for producing hydrophilic fine fibers having a long fiber length from a multi-component mixed polymer having no compatibility,
In particular, a method in which polyethylene glycol is mixed with a polymer, melt kneading is performed, and then fibers are produced (JP-A-49-529)
Alternatively, a method in which a surfactant is added to polyolefin, an effective film is thermoformed, and corona discharge treatment is further performed (Japanese Patent Publication No. 1-49381).

(2) A method of attaching a hydrophilic low molecular weight (surfactant). As this method, a method of attaching a fatty acid ester type nonionic surfactant having a high affinity to polyolefin fibers (JP-A-63-6166) and a method of using polyglycerin fatty acid ester (JP-A-2-216265) Etc. (3) A method of attaching a hydrophilic polymer compound.

There is a method in which a polyalkylene glycol derivative having a reactive hydroxyl group or an amino group and a curing catalyst are added and heat treatment is performed (Japanese Patent Publication No. 57-14378). (4) A method of performing a physical treatment such as plasma treatment or corona treatment. There is a method in which 0 ₂ is excited with high frequency energy under reduced pressure for treatment to carbonylate the surface (Japanese Patent Publication No. 53-794).

(5) Chemical treatment methods such as chemical treatment and solvent treatment.

[0009]

However, the above method (1) cannot achieve its purpose unless a large amount of the hydrophilizing agent is used, and if a large amount of the hydrophilizing agent is used,
It causes troubles in the manufacturing process of spinning or film forming and non-woven fabric. In the method of (2), the treatment method is simple, but not only the desired water permeability cannot be obtained due to poor wetting of the adhesive on the fiber surface or film surface, but durability is obtained even when a certain water permeability is obtained. However, there is a problem in that the skin is not obtained at all, and moreover, many of them have a great skin irritation.

In the method (3), the durability is generally insufficient, and when an adhesive agent which can obtain a certain degree of durability is used, the water permeability becomes insufficient and the adhesive agent is used in the nonwoven fabric manufacturing process. There is a problem that it causes various obstacles. The methods (4) and (5) have the advantage that relatively good results can be obtained in terms of skin irritation and water permeability, but on the other hand, the polar groups formed by the modification of the fiber surface or film surface Such changes are likely to cause a decrease in water permeability over time, and therefore have insufficient durability, and such means are uneconomical because they consume a large amount of heat and electric energy.

Of the above-mentioned hydrophilicity imparting techniques, in order to apply to a disposable absorbent article such as sanitary goods, the above-mentioned (2) is applied.
This method is most advantageous in terms of hydrophilicity control, processability, and economy. However, durable hydrophilicity (persistence of hydrophilicity)
There was a drawback that it was inferior. Therefore, an object of the present invention is to provide an absorbent article which has been subjected to a hydrophilization treatment which is safe for the body, inexpensive, good in productivity, and durable.

[0012]

The present invention relates to a surfactant having a long-chain alkyl group represented by the following general formula (I) and a sugar skeleton in a polyolefin nonwoven fabric or a polyolefin apertured film. The above object is achieved by providing an absorbent article characterized by comprising a hydrophilic material having adhered thereto.

[0013]

[Chemical 3] However, R is a long chain alkyl (straight chain or branched C _{8 to} C ₂₂ ,
Desirably C ₈ ~C _{1 2),} X is (CH ₂ CH ₂ O) n
H, a hydrophilic group such as (CH ₂ CH ₂ O) n SO ₃ M, n is 0
~ 6, M is an alkali metal such as Na, K, preferably Na
Is. As the polyolefin nonwoven fabric of the present invention, a single fiber or a composite fiber of polyolefin, polyester, polyurethane or the like manufactured by a heat bond method or a water jet method is used.

Typical fibers used in the heat bond system are polyolefins such as polypropylene and polyethylene; polyesters; nylon 6; polyamides such as nylon 66; and polyacrylonitrile-based resins having a relatively melting point. Examples thereof include a sheath-core type, a skin-core type (the core is a high-melting point resin), a side-by-side type composite fiber, which is a combination of a high resin and a low melting point resin. Among these, more preferred is a composite fiber in which polyethylene is a low-melting resin in which the resin itself has a strong melt adhesive force and the resin itself is soft, and the most preferred is a crimp elasticity of the fiber itself is large and stable. It is a composite fiber composed of a combination of polyethylene-polypropylene and polyethylene-polyester.

As typical fibers used in the water jet system, not only the heat-bonding fibers of the heat bond system described above but also non-heat-bonding fibers such as rayon,
Polyester and the like can also be preferably used. recent years,
Synthetic fibers that are divided into fine fibers by water flow, such as polyester / polyolefin divided fibers and polyamide / polyolefin divided fibers, can be used more suitably in terms of texture.

The polyolefin perforated film is a film similar to a net-shaped or three-dimensional perforated film used as a surface material of an ordinary absorbent article. As a material for the polyolefin perforated film, a polyolefin-based film is used. Polyethylene is preferable from the viewpoint of resin, particularly texture, cost, etc., and a form having an opening portion is more necessary than water permeability. As for the form of the openings, it is possible to use a net shape in which the openings are simply scattered to have a known three-dimensional shape, for example, the technique disclosed in Japanese Patent Application Laid-Open No. 1-204669. In order to prevent the liquid once absorbed from returning to the body side, it is preferably in a three-dimensional form.

The above-mentioned surfactant impregnates the above-mentioned polyolefin non-woven fabric or polyolefin perforated film with hydrophilicity, and preferably 0.01 to 0 to the above-mentioned polyolefin non-woven fabric or polyolefin perforated film. 0.5% by weight, particularly preferably 0.1
It is desirable to deposit 0.4% by weight. This is because if it is less than 0.01% by weight, the effect as a surfactant cannot be effectively exhibited, and if it is more than 0.5% by weight, the effect as a surfactant is almost unchanged.

The method of attaching the surfactant or the mixture thereof to the polyolefin nonwoven fabric or the polyolefin perforated film is not particularly limited, and examples of the attachment method include a diluting solution of the surfactant or the mixture thereof. Immersion method using, spray method,
A roller lubrication method or the like can be adopted, and in order to obtain a predetermined amount of remaining adhesion, the concentration of the liquid and the squeezing ratio may be adjusted appropriately.

Examples of the attaching step include a spinning step of polyolefin fibers, an oil agent treatment step of raw cotton prior to the spinning step, a non-woven fabric manufacturing step and a knitting step, or a non-woven fabric or a woven fabric is directly applied. It can also be processed. The hydrophilic material is particularly suitable as the surface material of an absorbent article having an absorber and a liquid-permeable surface material covering the surface of the absorber.

Further, the above hydrophilic material, together with the above-mentioned surfactant, serves as an antistatic agent of the following general formula (I).
The polyoxyethylene alkyl ether phosphate metal salt represented by I) is preferably attached.

[0021]

[Chemical 4] However, R'is a saturated or unsaturated hydrocarbon group having 12 to 18 carbon atoms, m is an integer of 0 to 15, M is an alkali metal such as Na or K, and preferably K. Such an antistatic agent is obtained by adding the polyoxyethylene alkyl ether phosphate metal salt (B) represented by the general formula (II) of the above (Chemical formula 4) to the surfactant represented by the general formula (I) of the (Chemical formula 3). It is preferable to use a mixture obtained by mixing (A) :( B) = 70 to 100: 30 to 0 with respect to (A), and this mixture is used for a polyolefin nonwoven fabric or a polyolefin apertured film. It is preferable that 0.01 to 0.5% by weight is attached. In this case, not only hydrophilicity but also antistatic property can be imparted, so that the processing characteristics of the polyolefin nonwoven fabric or the polyolefin apertured film can be improved.

The polyolefin non-woven fabric or the polyolefin perforated film is specifically a woven fabric or non-woven fabric used as a surface material and an absorbent body in absorbent articles such as disposable diapers and sanitary napkins, but is preferably Is a non-woven fabric.

[0023]

The absorbent article according to the present invention is excellent in hydrophilicity and durability. Therefore, when the absorbent article of the present invention is mounted, body fluid and the like near the surface of the absorbent article can be swiftly and continuously maintained. It is absorbed by the absorber and leakage or discomfort from the absorbent article is prevented.

During the production of the absorbent article, the hydrophilicity of the absorbent article can be easily controlled by the amount of the hydrophilic material.

[0025]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will now be described in detail with reference to FIGS. An implementation product and a comparison product were prepared by the following method, and the following tests were performed for each.

(1) Preparation of product for implementation and comparison product (Preparation of non-woven fabric sample) A composite fiber of 2 denier x 51 mm length having a sheath of polyethylene and a core of polypropylene was prepared at 25 ° C x 40% RH (relative humidity). ) For 24 hours, and passed through a fiber-spreading machine and a roller card at the same temperature and humidity so that the web weight would be 24 g / m ² to prepare a card web. This card web is 10 cm x 10 cm
The sample was cut into pieces and heat-treated with a heater plate at 130 ° C. for 30 seconds to obtain a nonwoven fabric sample.

(Preparation of test sample) The above non-woven fabric is immersed for 5 minutes in a 0.3% aqueous solution of each surfactant shown in Table 1. After the dipping, the squeezing ratio was reduced to 150% by a roller squeezing machine, and then dried in a drying machine at 80 ° C. for 2 hours to obtain a test sample. [Example 1] Example 1 was prepared by adding decyl glucoside as a surfactant to the above test sample.

Example 2 Example 2 was a mixture of the above-mentioned test sample in which decyl glucoside and lauryl phosphate K salt were mixed at 90/10 (% by weight). [Comparative product 1] Comparative product 1 obtained by adding polyoxyethylene lauryl ether sulfate K salt to the above test sample.
And

[Comparative Product 2] Comparative product 2 was prepared by adding lauryl sulfate K salt to the above test sample. [Comparative product 3] Comparative product 3 was prepared by adding the dioctylsulfosuccinic acid Na salt to the above test sample.

(2) Measurement [Measurement 1] Penetration time As shown in FIG. 1, a non-woven fabric 1 treated with a surfactant and a 5.5 cm diameter N0.5A filter paper 2 were placed on the rubber packing 4 with the filter paper 2 facing upward. It is sandwiched in a glass cylinder 3 having a diameter of 35 mm, and 10 cm ^{3 of} artificial urine 5 is supplied from a height of 30 mm above.

The time (t) from when the artificial urine 5 passed through the filter paper 2 and the nonwoven fabric 1 to when it started to leak was measured.
The results are shown in Table 1. [Measurement 2] Squeezing ratio When fibers or cloth are dipped in the solution and the treatment liquid is adhered (dipped), an operation of squeezing an extra solution is performed as a method of controlling the adhered amount. At this time, the aperture ratio is defined by the following formula (1).

Squeezing ratio = (weight after treatment−weight before treatment) / weight before treatment (1) [Measurement 3] Surface liquid flow As shown in FIG. 2, absorption of an absorbent article (commercial disposable napkin) The body 10 is coated with a polyolefin film 11 treated with a surfactant, and the tilt angle X is 45 °.
Was mounted on the inclined plate 7 of No. 2 and horse blood was injected at a flow rate of 6 g / min, and the distance of the liquid flow was measured. The results are shown in Table 1 below.

[Measurement 4] Liquid transit time As shown in FIG. 4, a perforated polyolefin film 11 treated with a surfactant was placed on the absorbent body 12 of an absorbent article (for example, a commercially available disposable napkin), and glycerin / H was used. ₂
5 g (reference numeral 5) of O = 85/15 (wt%) liquid was injected, and the time until the injection was completed was measured. The results are shown in Table 1 below.

In Table 1 below, the permeation time and squeezing ratio were measured when a polyolefin nonwoven fabric was used as a test product (implemented product and comparative product), and the surface flow was measured when a polyolefin aperture film was used. The liquid permeation time was measured. Further, the samples (implemented products and comparative products) were stored in an environment of 40 ° C. and 80% RH, and durability was evaluated by the same evaluation method. The result is shown in FIG.

[0035]

[Table 1] As is clear from Table 1 and FIG. 5, according to the absorbent article of the present invention, the initial absorption performance is equivalent to that of the conventional hydrophilizing agent, but the agent has excellent long-term storage stability. I understand.

In particular, as is clear from FIG. 5, according to the present invention (Example 9), it is found that the absorption performance is hardly changed even after storage for several months. Also, corona treatment is applied to the polyolefin-based film having an opening,
A 1% aqueous solution of each surfactant shown in Table 1 was applied using a spray. The coating amount was adjusted by the film conveying speed and the discharge amount from the spray. 1 after coating in a dryer at 70 ° C
After drying for a minute, a test sample was obtained, and when the above-mentioned measurement was performed on this sample, the same result as the above-mentioned measurement result was obtained.

The present invention is not limited to the above-described embodiment, but can be variously modified without departing from the gist of the present invention. For example, the polyoxyethylene alkylate represented by the general formula (II) of (Chemical formula 4) may be mixed with the substance represented by the general formula (III) of the following (Chemical formula 5).

[0038]

[Chemical 5] The substance represented by the general formula (III) is produced at the same time when the substance of the general formula (II) is produced. Further, the hydrophilic material to which the surfactant is attached is not limited to be used as the surface material of the absorbent article, and the same effect can be obtained even if it is used as the absorber.

[0039]

EFFECT OF THE INVENTION According to the absorbent article of the present invention, it is possible to carry out hydrophilic treatment which is safe for the body, inexpensive, highly productive and durable.

[Brief description of drawings]

FIG. 1 is a schematic cross-sectional view of an apparatus for measuring liquid permeation time in Experiment 1.

FIG. 2 is a cross-sectional view showing a configuration of an absorbent article in Experiment 1.

FIG. 3 is a schematic view of a surface flow measuring device in Experiment 1.

FIG. 4 is a schematic cross-sectional view of a liquid passage time measuring device in Experiment 1.

FIG. 5 is a graph showing durability test results in Experiment 1.

[Explanation of symbols]

 1 Non-woven fabric 2 Absorber 3 Glass cylinder 4 Rubber packing 5 Artificial urine 7 Inclined plate 11 Polyolefin film 12 Absorber

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification code Internal reference number FI technical display location D06M 13/32

Claims (4)

[Claims] 1. A non-woven polyolefin or polyolefin
The following formula (I) of the following (Chemical formula 1) can be applied to an in-hole film.
Activity with a long-chain alkyl group and sugar skeleton
Characterized by having a hydrophilic material to which an agent is attached
Absorbent article. [Chemical 1]However, R is a long-chain alkyl group (straight chain or branched C₈~
C_{twenty two}), X is (CH₂CH ₂O) n H, (CH₂CH₂
O) n SO₃Hydrophilic groups such as M, n is 0 to 6, M is Na, K
Alkali metal such as. 2. The hydrophilic material is used as the surface material of an absorbent article having an absorbent body and a liquid-permeable surface material covering the surface of the absorbent body. The absorbent article described. 3. The hydrophilic material is obtained by depositing 0.01 to 0.5% by weight of the surfactant onto the polyolefin nonwoven fabric or the polyolefin apertured film. The absorbent article according to 1 or 2. 4. The hydrophilic material has a polyoxyethylene alkyl ether phosphate metal salt represented by the general formula (II) of the following (Chemical Formula 2) attached as an antistatic agent together with the surfactant. The absorbent article according to any one of claims 1 to 3. [Chemical 2] However, R'is a saturated or unsaturated hydrocarbon group having 12 to 18 carbon atoms, m is an integer of 0 to 15, and M is an alkali metal such as Na or K.