JP2002161474A - Durable water permeability-imparting agent and water- permeable fiber - Google Patents

Abstract

PROBLEM TO BE SOLVED: To achieve with a treating agent the reduction in the returned liquid amount of paper diaper, sanitary goods or the like, which has relied on structural means, and further to improve durable hydrophilicity and reduce the deterioration of the durable hydrophilicity with the passage of time, thereby providing a fiber and a fiber product which have excellent surface characteristics, respectively. SOLUTION: This durable water permeability-imparting agent comprises (a) 30 to 60 wt.% of a polyoxyalkylene fatty acid amide, (b) 5 to 20 wt.% of an acylated polyamine cationized product, (c) 10 to 60 wt.% of an alkylphosphate, (d) 10 to 30 wt.% of a trialkylglycine derivative, and (e) 5 to 20 wt.% of a polyoxyalkylene-modified silicone.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a treatment agent suitable for nonwoven fabric fibers used for top sheets such as disposable diapers and synthetic napkins, and to fibers and fiber products to which the treatment agent is applied. More specifically, urine and bodily fluids once absorbed through the topsheet flow back from the topsheet and adhere to the wearer, that is, improve the liquid return, and at the same time, improve the liquid absorption characteristics and durability of the topsheet. The present invention relates to a fiber treatment agent having improved water permeability and fibers and fiber products provided with the treatment agent.

[0002]

2. Description of the Related Art In general, absorbent articles such as disposable diapers and sanitary articles include a surface sheet obtained by imparting hydrophilicity to various nonwoven fabrics mainly composed of polyester fibers including polyolefin or triacetate fibers having strong hydrophobicity. It has a structure in which a material made of cotton-like pulp or a polymer absorber is arranged between water-repellent back sheets. Liquids such as urine and bodily fluids pass through the topsheet and are absorbed by the absorber.At this time, in order to eliminate the stickiness of the topsheet, it is necessary to have good water permeability, that is, the liquid is transferred from the top to the inside of the topsheet. It is necessary not only that the time until it is completely absorbed by the absorber is extremely short, but also that the liquid once absorbed by the absorber does not return to the topsheet. Further, the treatment agent on the topsheet flows out due to the absorption of the liquid only once or twice and the water permeability sharply decreases. This is because the number of diaper replacements increases, which is not desirable. In addition to being required to have a certain hydrophilic property, it is also required to prevent deterioration of the surface characteristics due to the passage of time. Further, from the viewpoint of nonwoven fabric production, it is required that a uniform web is formed without wrapping around a cylinder when passing through an antistatic process or a carding process so as to enable smooth production.

For comfortable wearing of diapers, it is important that water permeability is good, liquid return is small, and hydrophilicity is maintained (durable hydrophilicity) even with repeated water permeation of liquid. Techniques have been proposed to improve these characteristics by treating agents. JP-B-63-14081 discloses a method of treating fibers with a potassium salt of a straight-chain alkyl phosphate having 12 to 22 carbon atoms, and JP-A-60-215870 discloses a method of treating a fiber having 10 to 30 carbon atoms with an alkyl phosphate salt. Treatment agents containing 10 to 30 betaine compounds, sulfate salts, or sulfonate salts have been proposed,
Japanese Patent Application Laid-Open No. 4-82961 discloses a method in which a polyether-modified silicone is used in combination with an alkyl phosphate, and a method in which two types of betaine compounds are used in combination with an alkyl phosphate is proposed in Japanese Patent Application Laid-Open No. 2000-170076. ing.

[0004]

However, although the proposed method has advantages and disadvantages in the required surface properties of the nonwoven fabric, none of the methods is sufficient in terms of the liquid retentivity. A hydrophilic treating agent is preferred for improving water permeability, and a hydrophobic treating agent is preferred for reducing liquid return.However, these properties are not limited to the properties of the treating agent component such as hydrophilicity and hydrophobicity, but also to the component. It is affected by the chemical structure, the balance between hydrophilicity and hydrophobicity, and the interaction between components.However, it is difficult to achieve both water permeability and reduction of liquid return. We have to rely on such means as making a double structure using non-woven fabric, adjusting the arrangement and amount of flocculent pulp and polymer absorbers, and devising the structure of so-called disposable diapers and sanitary products. Was. An object of the present invention is to achieve a reduction in the amount of liquid returned by a treatment agent, which has hitherto relied on structural means such as disposable diapers and sanitary articles. An object of the present invention is to provide a fiber and a fiber product having reduced surface properties and excellent surface properties.

[0005]

The present invention is achieved by a treating agent comprising a system consisting of an alkyl phosphate salt / a trialkylglycine derivative / a polyalkylene-modified silicone and a polyoxyalkylene fatty acid amide and an acylated polyamine cationized compound. . That is, (a) 30 to 60% by weight of a polyoxyalkylene fatty acid amide;
5 to 20% by weight of the acylated polyamine cationized product,
(C) 10 to 60% by weight of an alkyl phosphate salt,
(D) 10 to 30% by weight of a trialkylglycine derivative, and (e) 5 to 30% by weight of a polyoxyalkylene-modified silicone.
The effect of the present invention can be obtained by the durable water-permeability-imparting agent characterized by containing 20% by weight.

In the polyoxyalkylene fatty acid amide of the present invention, the polyoxyalkylene group includes a polyoxyethylene group, a polyoxypropylene group, a polyoxybutylene group and the like. In particular, polyoxyethylene alone or polyoxyethylene and polyoxyethylene are used. Preferred are random or block copolymers of oxypropylene. The number of moles added is 2
-20 mol, more preferably 5-15 mol. The amount of polyoxyethylene to be copolymerized is not more than equimolar to that of polyoxypropylene, and is preferably not less than that. The fatty acid amide used above has 16 or more carbon atoms, more preferably 18 to
It can be obtained by reacting a saturated or unsaturated fatty acid which may have 28 side chains with an alkanolamine, for example, monoethanolamine, diethanolamine, monoisopropanolamine and the like in a conventional manner. If the fatty acid has less than 16 carbon atoms, the durable hydrophilicity decreases, which is not preferred. A particularly preferred fatty acid alkanolamide is a 2: 1 to 1: 2 equivalent reaction of a higher fatty acid such as stearic acid, oleic acid, behenic acid, erucic acid and diethanolamine. The compounding ratio of the polyoxyalkylene fatty acid amide is
It is preferably from 30 to 60% by weight, more preferably from 35 to 55% by weight. If the amount is less than 30% by weight, sufficient durable hydrophilicity cannot be obtained, and the amount of liquid returned increases. If the amount is more than 60% by weight, the amount of liquid returned decreases, but it may cause winding of the cylinder in the card process. The uniformity of the web is reduced.

The compounding ratio of the cationized acylated polyamine is preferably 5 to 20% by weight. If it is less than 5% by weight, the durable hydrophilicity decreases and the amount of liquid returned increases.
If the content is more than 10% by weight, the viscosity of the product and the viscosity of the solution increase, and the workability deteriorates. An acylated polyamine cation can be obtained by reacting an acyl monoamide or diamide obtained by a conventional reaction of a higher fatty acid and a polyethylene polyamine with chloropropylene oxide. The acyl group has 16 or more carbon atoms, more preferably a saturated or unsaturated fatty acid which may have a side chain of 18 to 28, and examples thereof include oleic acid, stearic acid, and behenic acid.
Examples of the polyethylene polyamines include ethylenediamine, diethylenetriamine, triethylenetetramine and the like, diethylethylenediamine, aminoethylethanolamine and the like.

The alkyl phosphate salt preferably has 6 to 18 carbon atoms, more preferably 8 to 14 carbon atoms, as an alkyl group. When the number of carbon atoms in the alkyl group is more than 18, the hydrophilicity decreases, and when the number of carbon atoms is less than 6, the passability through the carding step decreases. Examples of the salt include an alkali metal salt and an amine salt, and an alkali metal salt is preferable. The compounding amount of the alkyl phosphate salt is 10 to 60% by weight, more preferably 15 to 55% by weight. If it exceeds 60% by weight, the durable hydrophilicity is reduced, and if it is less than 10% by weight, the permeability in the card process is reduced. A polyoxyalkylene alkyl phosphate salt to which a polyoxyalkylene group has been added to supplement the hydrophilicity of the above alkyl phosphate salt may be used in combination. The combined amount is 10 to 30% by weight based on the alkyl phosphate salt.

A trialkylglycine derivative is a compound having a so-called betaine structure, which is an inner salt of a quaternary ammonium and a carboxyl group in which three alkyl groups are bonded to a nitrogen atom in a glycine molecular structure. The alkyl group can be arbitrarily selected from those having 1 to 22 carbon atoms. Specific examples of the trialkylglycine derivative include dimethyl dodecyl glycine hydroxide, dimethyl tetradecyl glycine hydroxide, dimethyl octadecyl glycine hydroxide, heptadecyl imidazolium hydroxyethyl glycine hydroxide,
Inner salts such as β-hydroxyoctadecyldimethylglycine hydroxide are exemplified, and among these, two alkyl groups are lower alkyl groups such as methyl and ethyl,
Those having one long-chain alkyl group having 12 or more carbon atoms are preferred. Particularly, dimethyl octadecyl glycine hydroxide and heptadecyl imidazolium hydroxyethyl glycine hydroxide are preferred. The mixing ratio of the trialkylglycine derivative is preferably from 10 to 30% by weight. If it is less than 10% by weight, sufficient durability hydrophilicity cannot be obtained,
If it exceeds 30% by weight, the durable hydrophilicity is improved, but the amount of liquid returned increases and the feeling of roughness on the surface of the nonwoven fabric decreases.

As the polyoxyalkylene-modified silicone, those represented by the following general formula are preferred.

[0011]

Embedded image

The Si content in this modified silicone is 20
It needs to be 70%, and if it exceeds 70%, the stability of the product is poor and the cost is high. On the other hand, if it is less than 20%, sufficient hydrophilicity cannot be obtained, which is not preferable. As the above polyoxyalkylene group, polyoxyethylene group, polyoxypropylene group, polyoxybutylene group,
And those obtained by copolymerizing these constituent monomers, and the like. However, it is necessary that the polyoxyethylene portion is contained at least 20% by weight based on the polyoxyalkylene. If it is less than this, sufficient hydrophilicity performance cannot be obtained, which is not preferable. The molecular weight of the modified silicone is
It is necessary to be in the range of 1,000 to 100,00, and if it is out of this range, the hydrophilicity is reduced. In particular, when it is less than 1,000, this tendency is remarkable. 5 to 20% by weight of the polyoxyalkylene-modified silicone described above, preferably 5 to 20% by weight.
What is blended at 15% by weight is important. If this blending amount is 2
When the content exceeds 0% by weight, hydrophilicity with excellent durability can be obtained. If the amount is less than 5% by weight, sufficient durability hydrophilicity cannot be obtained.

The durability-imparting agent of the present invention may further include an antistatic agent such as sodium alkane sulfonate, an amphoteric N-alkylsulfopyrrolidone or a nonionic emulsifier, a lubricant such as carnauba wax, if desired. May be added. If necessary, an appropriate antifoaming agent and preservative may be added.

The durable water-permeability-imparting agent of the present invention includes hydrophobic fibers or fiber products made of hydrophobic fibers, fibrillated polyolefin fibers, polyester / polyethylene-based, polyester-polypropylene-based, copolypropylene-polypropylene-based core-sheath structures, It is preferably applied to heat-fused fibers such as copolyester / polypropylene and copolyester / copolyester composite fibers and fiber products thereof.

The durable water-permeability-imparting agent of the present invention may be used not only for polyolefin fibers and fibrillated polyolefin fibers, but also for polyester fibers, nylon fibers, PVC fibers, and composite fibers obtained by combining these as heat-fusible fibers. I can do it. Nonwoven fabrics such as spunbond, spunlace and meltblown can also be used. In addition, for fiber products, not only clothing products such as underwear, which is the final product formed from fibers, but also the heat-bonded fibers themselves,
And a web and a nonwoven fabric formed by mixing heat-fusible fibers.

The durable water-permeability-imparting agent of the present invention can be attached to the fiber in an emulsion or straight form. For emulsions, dilute to 5 to 30% by weight with water. For straight lubrication, dilute to 5 to 30% by weight with low viscosity hydrocarbon compounds to attach the following amounts, Sometimes it can be added to the polymer. Refueling may be either roller or nozzle spray. The durability imparting agent of the present invention is usually 0.1 to 2.0 with respect to the fiber.
%, Preferably 0.3-0.7% by weight.
If the amount is less than 0.1% by weight, the water permeability and durability are insufficient. If the amount exceeds 2.0% by weight, the number of windings increases when the fiber is treated with a card, and the productivity is greatly reduced. However, fiber products such as non-woven fabrics are not preferred because stickiness increases after permeation. 2-3 when added to polymer
0% by weight, preferably 3 to 15% by weight. If the amount to be added is less than 2% by weight, water permeability is insufficient, and 30% by weight.
Exceeding this is not preferred because the fiber strength is reduced and the productivity is significantly reduced.

By applying the durable water-permeability-imparting agent of the present invention to fibers or textiles, the amount of urine and body fluids returned is reduced and the durability to repeated water permeation is deteriorated over time (durable hydrophilicity is reduced). At the same time, the antistatic property and the lubricity are improved in the nonwoven fabric manufacturing process, so that the fiber opening property is improved and the card passing property can be further improved.

[0018]

EXAMPLES The present invention will be described below with reference to examples.
The present invention is not limited to this. The evaluation items and evaluation methods in each example and comparative example are as follows. Tables 1 and 2 collectively show the details and evaluation results of the treatment agents in each of Examples and Comparative Examples. In the specification of the treatment agent,
All compounding ratios represent weight%.

The treatment agents of the Examples and Comparative Examples were lubricated to 5
By weight (based on the fiber weight, OWF; 0.5% by weight in terms of pure treating agent) and dried. Next, this was passed through the steps of blended cotton and card to produce a web having a basis weight of 30 g / m ² . The web having a basis weight of 30 g / m ² was heat-treated at 130 ° C. in an air-through type hot air circulation dryer to fix the web. The nonwoven fabric thus produced was used for the following hydrophilicity test.

Card characteristics: Card passability: 30 ° C. × 7
Under the condition of 0% RH, the state of winding of the cylinder and the state of the web are mainly determined, and the antistatic property is 20 × 45%
The determination was made based on the charged voltage of the generated static electricity at the RH. Each ranking is as follows. Card passability: 30 ° C x 70% R using a card tester
After carding 40 g of the sample short fiber under the condition of H, the cylinder was observed and evaluated according to the following criteria. 5 ... No winding 4 ... Wound on 1/10 of the cylinder surface 3 ...
Coiled on 1/5 of cylinder surface, 2 ... Coiled on 1/3 of cylinder surface, 1 ... Covered on entire surface. 5 is best Antistatic: 20 ° C x 45% R using a card tester
Under the condition of H, 40 g of the sample short fiber was used as a web, and the voltage of static electricity generated on the web was measured and evaluated according to the following criteria.
If it is less than 100 V, it can be put to practical use. 5 ... less than 50V, 4 ... 0.5 to 1.0KV, 3 ... 1.0
1.5KV, 2 ... 1.5-2.0KV, 1 ... 2.0K
Greater than V. 5 is the best

Liquid return amount: A nonwoven fabric (10 cm × 10 cm) is placed on a commercially available disposable diaper, and an inner diameter of 60 cm is further placed thereon.
A cylinder of mm is placed, and 100 ml of physiological saline is poured into the cylinder and absorbed through a nonwoven fabric into a disposable diaper. When all of the physiological saline is absorbed into the disposable diaper, the cylinder is removed, and 20 sheets of pre-weighed filter paper (Toyo Filter Paper, No. 5) are stacked, and a weight of 5 kg is placed on this. After standing for 5 minutes, the filter paper was weighed, and the amount of weight increase was measured to determine the amount of liquid returned (g).
The allowable range is 1.5 g or less, but preferably 1.0 g or less.

Initial hydrophilicity of non-woven fabric: A non-woven fabric having a basis weight of 30 g / m ² is overlaid on filter paper (Toyo Roshi Kaisha, No. 5), and one drop (approximately 0. (0.5 ml) of physiological saline is dropped, and the time until water drops disappear from the surface of the nonwoven fabric is measured. This measurement is performed at 20 places on the surface of the nonwoven fabric, and the number of pieces in less than 5 seconds is indicated. If this number is 18 or more, the initial hydrophilicity is good.

Durability and hydrophilicity of non-woven fabric:
(cm × 10 cm) is placed on a commercially available disposable diaper, a cylinder having an inner diameter of 60 mm is placed thereon, and 80 ml of physiological saline is injected into the cylinder and absorbed through the nonwoven fabric into the disposable diaper. After allowing to stand for 3 minutes after water injection, the nonwoven fabric was sandwiched between two pieces of filter paper (Toyo Filter Paper, No. 5), and a plate (10 cm × 1) was placed thereon.
0 cm) and a weight (total of 3.5 kg) are left to dehydrate for 3 minutes, and then air-dried for another 5 minutes. At the place where physiological saline passed through the sample nonwoven fabric in the cylinder after air drying, the disappearance time of physiological saline was measured at 20 places by the initial hydrophilicity test method of the nonwoven fabric, and the number of less than 5 seconds was displayed. . When the number is 18 or more, the durability and hydrophilicity are good. The same operation is repeated for the nonwoven fabric subjected to the test. In this repetitive test, it is preferable that the number of physiological saline disappeared is large even if the number of times is repeated.

Daily change of durable hydrophilicity: The above nonwoven fabric (1)
(0 cm × 10 cm) in an environmental tester at 40 ° C. × 70% RH for 30 days. After 30 days, the nonwoven fabric (10cm × 10
cm) from the environmental tester, and the above-mentioned nonwoven fabric is subjected to the initial hydrophilicity and durability hydrophilicity test. It is assumed that the smaller the difference between the repeated evaluations of the durability hydrophilicity test before and after the introduction of the environmental tester, the smaller the daily change of the durability hydrophilicity. The smaller the change over time, the better.

[0025]

[Table 1]

[0026]

[Table 2]

[0027]

[Table 3]

[0028]

[Table 4]

In the examples corresponding to the compositions and the ratio ranges shown in claim 1, the liquid return amount was small and the required properties such as durable water permeability were fully satisfied.
In particular, Examples 5 and 6 have a small liquid return amount and are excellent in durability and water permeability after aging. Further, the comparative examples out of this ratio range cannot satisfy all the required characteristics. The synergistic effect of the optimal combination of each component is well exhibited. Although the liquid return amounts of Comparative Examples 4 and 5 are at a small level, they are inferior in durability water permeability and water permeability after aging. The results of the comparative examples are inferior to those of the examples in durability water permeability and water permeability after aging.

[0030]

The treatment agent according to the present invention not only reduces the amount of urine and body fluid returned, but also improves the durable hydrophilicity performance and reduces the decrease in hydrophilicity due to aging. At the same time, since the treating agent according to the present invention has good antistatic properties, it is possible to prevent static electricity troubles at low humidity, and it is possible to improve the card passing property due to good lubricity. Further, if the treatment agent according to the present invention is applied to a hydrophobic fiber such as a polypropylene fiber or the like and a non-woven fabric by means of spraying or the like, the fiber is rendered hydrophilic and the amount of urine and bodily fluids returned is reduced, and the durability is further improved. The decrease in hydrophilicity over time can be reduced. Therefore, the use of the treatment agent according to the present invention has a particularly advantageous effect that the processability and productivity for producing a fiber web can be improved while imparting a dry touch as a body fluid transport fiber.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI theme coat ゛ (Reference) C09K 3/00 D06M 13/453 D06M 13/328 15/643 13/368 A61F 5/44 H 13/453 A41B 13/02 E 15/643 A61F 13/18 310Z // A61F 5/44 F term (reference) 3B029 BB07 HA00 HB03 4C003 AA11 AA23 HA06 4C098 AA09 CC07 DD10 DD14 DD24 DD25 DD26 DD28 4L033 AC07 AC15 BA39 BA48 BA62 CA48 CA59

Claims (3)

[Claims] (1) 30 to 60% by weight of (a) a polyoxyalkylene fatty acid amide, (b) 5 to 20% by weight of an acylated polyamine cationized product, (c) 10 to 60% by weight of an alkyl phosphate salt, (d) A) water-permeability-imparting agent comprising 10 to 30% by weight of a trialkylglycine derivative and 5 to 20% by weight of (e) a polyoxyalkylene-modified silicone. 2. A water-permeable fiber, wherein the water-permeability-imparting agent according to claim 1 is applied to a fiber or a fiber product in an amount of 0.1 to 2.0% by weight. 3. The method according to claim 1, wherein (a), (b), and (c)
The water-permeable agent according to claim 1, wherein each of (d) and (e) is the following component, and the water-permeable fiber according to claim 2. (A) The polyoxyalkylene is a polyoxyethylene having 5 to 15 moles of added moles, and the fatty acid amide has 16 to 15 carbon atoms.
A polyoxyalkylene fatty acid amide which is a fatty acid ethanolamide having 28, (b) an acyl group having 1 carbon atom
An acylated polyamine cationized product wherein the polyamine is polyethylene polyamine; (c) an alkyl phosphate salt wherein the alkyl group has 8 to 14 carbon atoms and the salt is potassium; (E) 20% by weight or more of a polyoxyethylene part based on the polyoxyalkylene, and a molecular weight of 1,000 to 100,0.
A polyoxyalkylene-modified silicone that is 00.