JPH0280672A - Treating agent for binder fiber - Google Patents

Abstract

PURPOSE:To obtain the subject treating agent, containing a specific polyoxyalkylene-modified silicone and specified surfactant and capable of improving card passableness of binder fibers treated with the treating agent and exhibiting excellent permeability and holding properties of water. CONSTITUTION:A treating agent for binder fibers, obtained by blending (A) >=10wt.% polyoxyalkylene-modified silicone, containing >=40wt.% polyoxyalkylene groups with >=40wt.% polyoxyethylene content in the above- mentioned polyoxyalkylene groups and 1000-100000 molecular weight with (B) a surfactant having a >=28C hydrocarbon group as hydrophobic group, e.g., a nonionic surfactant having 28-50C hydrocarbon group and alkylene oxide group and capable of improving holding properties of an absorbed humor. The above-mentioned treating agent is used by application thereof to fibers for nonwoven fabrics, such as synthetic napkins, consisting of synthetic fibers to improve card passableness thereof and suppress generation of static electricity and is especially useful for conjugate fibers having polyolefin fibers as a sheath component.

Description

[Detailed description of the invention] Industrial applications The present invention relates to a processing agent for binder fibers.

Conventional technology Synthetic napkins used for disposable diapers, sanitary products, etc. cover the surface layer of a water-absorbing material with a non-woven fabric mainly made of hydrophobic fibers, and the body fluids absorbed by the water-absorbing material get wet on the outside, creating a damp feeling. It has been devised so as not to give

Such non-woven fabrics are made by forming fibers of hydrophobic polyolefin, triacetate, polyester, nylon, etc. into sheets using a wet process using a water stream or a dry process using an air stream or a carding machine, and then fixed with an adhesive or the like. There is.

In recent years, as a method for obtaining the above-mentioned nonwoven fabric, a method has been proposed in which composite fibers using a low melting point thermoplastic polymer and binder fibers are thermally bonded.

However, in this method, the binder fibers generally have poor card passability, static electricity is easily generated during the carding process, and the fibers often wrap around each other, resulting in poor process passability, resulting in a significant decrease in the productivity and quality of the nonwoven fabric. However, there is a drawback. Furthermore, when card passing properties are improved, the condition of the nonwoven fabric, such as tension and fiber adhesion, tends to decrease.

On the other hand, if extremely hydrophobic binder fibers are used to increase the retention of body fluids absorbed into the absorbent material, the process of absorbing body fluids into the absorbent material will take time, and even if the covering material gets wet, it will be difficult to absorb the body fluids. The purpose of napkins, which is to provide a dry feel, cannot be achieved. In order to solve this problem, attempts have been made to make the hydrophobic binder fibers hydrophilic to some extent, but this results in a disadvantage in that adhesiveness is reduced.

Problems to be Solved by the Invention The present invention improves the card passability of binder fibers used in nonwoven fabrics such as synthetic napkins, and improves the permeability and water resistance of body fluids and absorption into water absorbent materials without degrading the properties of the nonwoven fabric. An object of the present invention is to provide a treatment agent for binder fibers for improving the retention of body fluids.

Means for Solving the Problems The present invention provides a polyoxyalkylene group containing 40% by weight or more and a polyoxyethylene content of 40% by weight or more in the polyoxyalkylene group, which has a molecular weight of 1000 to 10.
0,000 polyoxyalkylene modified silicone 10
The present invention relates to a processing agent for binder fibers containing a surfactant whose hydrophobic group is a hydrocarbon group having a carbon number of 20 or more.

The polyoxyalkylene-modified silicone used in the present invention is, for example, the formula [I] and/or the formula [■]: R-X-Y-R
' R [wherein R is any hydrocarbon group that may be the same or different, X is lower alkylene or N-(aminoalkyl)
A compound represented by 1, where Y is an alkylimino group, Y is a polyoxine alkylene residue, and R' is hydrogen, an alkyl group, a phenyl group, an alkylphenyl group, an acyl group, a phosphoric acid ester residue, or a sulfuric acid ester residue. , R is preferably methyl, but some of them may be lower alkyl groups such as ethyl groups, phenyl groups, benzyl groups, and/or higher alkyl groups. R' is preferably hydrogen, but also an alkyl group, in particular an alkyl group having 4 to 50 carbon atoms, such as butyl, 2-ethyl bexyl, lauryl
Stearyl; phenyl; alkylphenyl; benzyl; may also be acyl, such as acetyl, stearoyl, etc.

X is lower alkylene such as methylene or propylene, N-
(Aminoethyl)methylimino, N-(aminopropyl)propylimino group, etc.

Y represents a polyoxyalkylene group obtained by addition polymerization of alkylene oxide such as ethylene oxide, propylene oxide, butylene oxide. The polyoxyalkylene group accounts for 40% by weight or more, preferably 45 to 60% by weight of the total weight of the polyoxyalkylene-modified silicone. At least 40% by weight, preferably 50 to 100% by weight of this polyoxine alkylene group is a polyoxyethylene group, and may be bonded to other polyoxine alkylene groups by either random polymerization or block polymerization.

The polyoxyalkylene group accounts for 40% of the total weight of the modified silicone.
When the amount is less than % by weight, the hydrophilicity decreases, resulting in a decrease in body fluid permeability of the nonwoven fabric. Similarly, if the content of the polyoxyalkylene group in the polyoxyalkylene group is less than 40% by weight, this is also not preferred because the hydrophilicity decreases.

The molecular weight of polyoxyalkylene modified silicone is 100
0 to 100,000, particularly 3,000 to ao, ooo is preferable, and n and m in formula [T] and/or formula [I[] are selected so as to fall within that molecular weight range. Hydrophilicity decreases whether the molecular weight is larger or smaller than the above range, and this tendency is particularly marked when the molecular weight is small.

The content of polyoxyalkylene-modified silicone is 10% by weight or more based on the total amount of the binder treatment agent, preferably 20 to 7% by weight.
It is blended in an amount of 5% by weight, particularly preferably 20 to 40% by weight.

If it is less than 10% by weight, the hydrophilicity, durability, and water retention properties of the nonwoven fabric will decrease, as well as the card passability, which is undesirable.

Two or more modified silicones may be used as a mixture, and in this case, it is sufficient that the mixture falls within the above range on average, and it is not necessary for each individual modified silicone to satisfy the above range.

In addition to the above-mentioned modified silicone, the binder treatment agent of the present invention contains a surfactant whose hydrophobic group is a hydrocarbon group having 28 or more carbon atoms.

The above surfactant may be a nonionic surfactant, an anionic surfactant, a cationic surfactant, or an amphoteric surfactant, but good results can be obtained with a nonionic surfactant or an anionic surfactant.

The carbon number of the mud surfactant is 28 or more, preferably 28 or more.
It is characterized by having 50 hydrocarbon groups, especially saturated or unsaturated alkyl groups which may have side chains. The use of such a surfactant is essential for improving card passability (suppression of friction and generation of static electricity), hydrophilicity (adjustment of stickiness), and durability during spinning of binder fibers. It is difficult to obtain sufficient effects even when using carbon atoms having a carbon number smaller than 20.

Examples of nonionic surfactants include adducts of alkylene oxides of higher alcohols and alkyl phenols having 28 or more carbon atoms, preferably 28 to 50 carbon atoms, esters of higher fatty acids with polyalkylene glycols (diesters may also be used),
It may also be an ester of a polyhydric alcohol with an alkylene oxide adduct. It may also be an alkylene oxide adduct of a higher alkylamine or a higher alkylamide having an alkyl group having 28 or more carbon atoms.

The polyoxyalkylene group of the above nonionic surfactant preferably contains polyoxyethylene groups in an amount of 10% by weight or more, preferably 40 to 100% by weight. The amount is preferably 10 to 90% by weight, and the hydrocarbon group having 20 or more carbon atoms in the nonionic surfactant is preferably in the range of 30 to 50% by weight in one molecule of the surfactant.

The terminal hydroxyl groups of the nonionic surfactants described above may be esterified with dibasic acids such as maleic acid, succinic acid, phthalic acid, etc., or -basic acids such as acetic acid, lauric acid, stearic acid, etc.; It may also be etherified with alkyl groups such as methyl, ethyl, propyl, lauryl, cetinostearyl, oleyl, and the like. Alternatively, they may be linked using polyisocyanate.

The nonionic surfactant used in the present invention is generally adjusted to have a HL of 82 to 19, preferably 1O to 15, although it depends on the polyoxyalkylene-modified silicone used in combination and other surfactants as described below.

Examples of anionic surfactants whose hydrophobic group is a hydrocarbon group having 28 or more carbon atoms include sulfuric acid ester salts, phosphoric acid esters, or salts thereof (completely neutralized) of the above-mentioned nonionic surfactants whose terminal hydroxyl groups are not blocked. (including hydrated products and partially neutralized products), alkyl sulfonates, alkylbenzene sulfonates, alkyl sulfates, alkyl phosphates, and the like. Examples of the salt include salts of alkali metals such as sodium and potassium; ammonium; alkanolamines; alkylalkanolamines; and alkaline earth metals such as calcium and magnesium, with alkali metal salts being particularly preferred. In some cases, an ammonium salt may be used to obtain a nonwoven fabric with a formulation suitable for card passage, and then heat treated to remove ammonia, which may be used as a nonwoven fabric for napkins with better absorption and retention of body fluids. After improving the card passability using an unneutralized material and obtaining a nonwoven fabric, it was treated with alkali,
Body fluid absorption and retention properties may be adjusted to optimal conditions.

Two or more surfactants having a hydrocarbon group having a carbon number of 20 or more used in the present invention may be used in combination, and a nonionic surfactant and an anionic surfactant may be used in combination. However, it is not preferable to use an anionic surfactant and a cationic surfactant together.

The blending amount of the above surfactant is 10 to 70% by weight of the total amount of surfactants.
, more preferably 30 to 60% by weight.

The geographic agent of the present invention may further contain other surfactants. These surfactants include conventionally known nonions, anions, and
It may be a cationic or amphoteric surfactant, preferably a nonionic or anionic surfactant. Preferred hydrocarbon groups are alkyl or alkylphenyl groups which may have 8 to 18 saturated or unsaturated side chains.

The parent tree group is a polyoxyalkylene group obtained by reacting active hydrogen such as a hydroxyl group, amino group, or amide group with an alkylene oxide, especially polyoxyethylene or a copolymerized residue of polyoxyethylene and polyoxypropylene: phosphate; sulfate ; Examples include sulfonate residues. The terminal hydroxyl group of the oxyalkylene group may be esterified with sulfuric acid or esterified with phosphoric acid.

These conventional surfactants account for 5 to 70% by weight of the total amount of processing agents.
It is particularly preferable to blend the anionic surfactant in an amount of 5 to 50% by weight, and particularly good results can be obtained when the anionic surfactant is blended in an amount of 5 to 20% by weight.

The treating agent for binder fibers of the present invention is attached to the binder fibers in an amount of 0.1 to 1.5% by weight, preferably 0.3 to 0.7% by weight. If the amount of adhesion is less than 0.1% by weight, hydrophilicity and durability will be insufficient, and if the amount of adhesion exceeds 1.5% by weight, the amount of binder fibers wrapped around in the carding process will be extremely large, significantly reducing web productivity. I don't like it because it lowers the temperature.

The binder fiber treatment agent of the present invention can be applied to synthetic fibers conventionally used in diapers, sanitary napkins, etc., such as polyolefin fibers, polyester fibers, and composite fibers, with good results. It is useful for composite fibers used as sheath components.

The present invention will be explained below with reference to Examples.

A treatment agent for binder fibers prepared by mixing 100 parts by weight of the composition shown in Example Table 1 with 900 parts by weight of water was added to 5 parts by weight for 100 parts by weight of composite fibers containing polyethylene as a sheath component and polypropylene as a core component. I refueled it and dried it. The obtained fibers were made into a cotton blend by a conventional method and then carded.

Amount of static electricity generated in the carding process (20°C, 155% RH),
The winding and web conditions were observed. The results are shown in Table-1.

(1) Amount of static electricity generated 5: 0.5KV or less 4: 0.5KV-1.0KV 3: 1. OKV~1.5KV 2:1.5KV~2.0KV 1:2. Larger than OKV (2) Winding 5: No winding 4 l/l of Niji cylinder face Wound on O 3; Winding on cylinder face 115 2 Niji cylinder face 1
/3: There is wrapping l: There is wrapping on the entire surface (3) Web condition 5 Two tensions and uniformity 4: There is tension but the web is swaying 3: There is tension but there is tararabui 2: There is no tension and it is slightly shaped 1: Obtained with some web breakage; The web was exposed to a hot air oven at 145° C. for 2 minutes to form a nonwoven fabric. The water permeability, water retention, and water resistance of the obtained nonwoven fabric were evaluated.

(A) Water permeability: A dry nonwoven fabric was stretched, water droplets were placed on the surface with a pipette, and the disappearance time and diffusion state of the water droplets were observed.

5: Water droplets disappear instantly and there is no stickiness at all.

4: Water droplets disappear within 10 seconds and there is no stickiness at all.

3: Water droplets disappear within 10-30 seconds and there is no stickiness at all.

2: The water droplets disappear within 30 to 60 seconds, leaving sticky residue only on the water droplet area.

1: Even after 60 seconds, water droplets do not disappear and stickiness remains.

(B) Water retention: Nonwoven fabric (l OcmX l O:,
(m) is placed on a water-absorbent material used in commercially available disposable diapers, and 200% water is dripped on top of it. Then,
Layer the filter paper on top of the non-woven fabric and place a weight (3.5 kg) on top of it.
). After 10 minutes, remove the filter paper, determine the increase in weight, and evaluate water retention.

5: Less than 5g 5: 5g or more and less than 10g 3: 109 or more and less than 2Ch 2: 2 (H or more and less than 25g 1: 25g or more (C) Water resistance: Soak the nonwoven fabric in water for 30 seconds, dehydrate with a centrifuge, After drying, the same evaluation as in (A) was performed.

The above test results are shown in Table 1.

The components corresponding to the abbreviations shown in Table 1 are shown below.

Other surfactants X-1: POE (20) sorbitan monostearate X-2 = sorbitan monooleate X-3: PEG (MWI540) palmitate X-4: POE (15) lauryl ether X-5:
POE (7) Cetyl ether X-6: POE (5) Octyl phosphate KX-7: POE (5) Stearyl phosphate KX-a: POE (7) Cetyl phosphate X-9 Dioctyl phosphate K 5) Cetyl sulfate NaX-
11: Myristyl sulfonate K X-12: POE (2) Stearylaminolaurate X-13 Nistearic acid diethanolamide X-14:
POE (30) lauryl aminostear L/-to However,
PO, EO, POE and PEG represent the following components.

PO Nioxypropylene EO Nioxyethylene POE: Polyoxine ethylene PEG: Polyethylene glycol Effects of the invention The binder fibers treated with the binder fiber processing agent of the present invention have good card passability, but do not cause problems such as generation of static electricity and curling. do not have. Furthermore, the nonwoven fabric obtained using the binder fibers treated with this treatment agent has excellent water permeability and excellent retention of water once absorbed into the water-absorbing material, so it is free from stickiness. Therefore, it is suitable as a coating material for diapers and sanitary napkins.

Patent applicant: Matsumoto Yushi Pharmaceutical Co., Ltd.

Claims (4)

[Claims] 1. Contains 40% by weight or more of polyoxyalkylene groups,
and a molecular weight of 1000 to 100, in which the polyoxyethylene content in the polyoxyalkylene group is 40% by weight or more,
A treating agent for binder fibers, comprising 10% by weight or more of a polyoxyalkylene-modified silicone of 0.000, and a surfactant whose hydrophobic group is a hydrocarbon group having 28 or more carbon atoms. 2. 2. The binder fiber processing agent according to item 1, wherein the hydrocarbon group of the surfactant has 28 to 50 carbon atoms. 3. 2. The binder fiber processing agent according to item 1, wherein the surfactant is a nonionic surfactant having a hydrocarbon group having 28 to 50 carbon atoms and an alkylene oxide group. 4. Contains 20-75% by weight of polyoxyalkylene-modified silicone, 10-70% by weight of alkylene oxide adduct of alcohol having 28-50 carbon atoms, and 5-20% by weight of anionic surfactant having a hydrophobic group having 8-18 carbon atoms. The binder fiber processing agent according to item 1.