JPH0726251B2 - Water soluble fiber - Google Patents

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to water-soluble fibers.

[0002]

2. Description of the Related Art Polyvinyl alcohol is used as a water-soluble fiber.
There are le fibers, which are processed into twisted yarns, woven fabrics, non-woven fabrics, and the like and used for various purposes. For example, adhesion in various steps, temporary reinforcement, and the like.

[0003]

However, the polyvinyl alcohol fiber has a low solubility in water and is about 80%.
It is necessary to dissolve it in hot water above ℃, and the workability is poor. In addition, when contact is made with a temperature of 100 ° C. or higher, cross-linking occurs and re-solubility often becomes a problem. Therefore, there is a need for fibers that are easily melted at room temperature and have sufficient remeltability even after heat treatment.

[0004]

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-mentioned problems and to provide a fiber formed by spinning a polymer which has sufficient strength but is highly flexible and has a high dissolution rate at room temperature. To do.

That is, a polyalkylene oxide compound obtained by addition-polymerizing an alkylene oxide containing ethylene oxide to an organic compound having two active hydrogen groups and a polyvalent carboxylic acid, its anhydride or its lower alkyl ester or diisocyanate, It is a water-soluble fiber composed of a high molecular weight compound having a weight average molecular weight of 10,000 or more obtained by the reaction.

The polyalkylene oxide compound used in the present invention preferably has a weight average molecular weight of 100 or more, and the compound constituting the compound has two active hydrogens such as ethylene glycol, propylene glycol, Polyethylene glycol, polypropylene glycol, polytetramethylene glycol, 1,6-
Hexanediol, aniline, etc. are mentioned, and alkylene oxide is further added thereto.

Examples of the alkylene oxide include ethylene oxide alone, ethylene oxide and propylene oxide, butylene oxide, styrene oxide, α-
Examples thereof include olefin epoxide and glycidyl ethers.

The addition polymerization of alkylene oxide is carried out by a known method, but the addition method of ethylene oxide and other alkylene oxides can be appropriately selected such as by mixing or by block polymerization.

Examples of the polyvalent carboxylic acid to be reacted with the polyalkylene oxide compound, its anhydride or its lower alkyl ester include phthalic acid, isophthalic acid,
Examples thereof include carboxylic acids such as terephthalic acid, sebacic acid, dimer acid, and pyromellitic acid. Examples of the lower alkyl ester include methyl ester, dimethyl ester, diethyl ester and the like. The most preferable specific examples are dimethyl terephthalate, dimethyl phthalate, dimethyl isophthalate, dimethyl sebacate, and pyromellitic dianhydride.

This polyesterification reaction is 120 to 250
It is preferable to carry out the treatment at a temperature of 1 / 10,000 to 10 Torr.

As the diisocyanate, tolylene diisocyanate, diphenylmethane diisocyanate, hexamethylene diisocyanate, isophorone diisocyanate, xylylene diisocyanate, 4,4'- Examples thereof include methylene-bis- (cyclohexyl isocyanate).

This urethanization reaction is carried out, for example, with NCO / OH.
80-150 by mixing in an equivalent ratio range of 1.5-0.5
It is obtained by carrying out at 1 ° C for 1 to 5 hours. The high molecular weight compound preferably has a weight average molecular weight of 10,000 or more, and when the weight average molecular weight is less than 10,000, mechanical strength is low and yarn breakage during spinning occurs, which is not preferable.

As the means for forming fibers, melt spinning, dry spinning and wet spinning are all possible, but the melt prevention method is preferable from the economical point of view. Melt spinning is 50 to 50 in the present invention.
It is melted in a nitrogen atmosphere at 200 ° C., and is performed using an ordinary die. At this time, a plasticizer, a lubricant, a stabilizer, a coloring agent, a filler and the like can be added. In some cases, fragrance,
Bactericides, pesticides, fertilizers, etc. can also be added.

After spinning, it may be treated with a hydrocarbon-based sizing agent, or it may be stretched as usual.
Further, the obtained filaments can be subjected to various processes such as twisting and cutting, and can be sufficiently mixed with other fibers.

[0015]

The water-soluble fiber of the present invention has low hygroscopicity, high tear strength, high dissolution rate in water, and good redissolvability. Therefore, when it is made into a filamentous or knitted fabric, it is strong at the time of use, but it is fast when it is removed.
And can be done completely. Further, the spun water-soluble fiber shows a large elongation of about 5 to 30 times. This dramatically improves the tensile strength.

[0016]

EXAMPLES Example 1. Polyethylene glycol (weight average molecular weight of 10,000
0) 2.2 parts of dimethyl terephthalate was added to 100 parts, and the polyesterification reaction was performed to obtain a weight average molecular weight of 130,0.
No. 00 compound (hereinafter referred to as high molecular weight compound A) was obtained.
This high molecular weight compound A was put into a melt spinning device and
C., melted in nitrogen, quenched from the spinneret at 50 m / min, and wound while stretching. Further, a plain weave fabric was prepared by using 10 filament yarns. This plain woven fabric disappeared in 15 seconds when placed in water. Further, this plain fabric was partially heat-sealed (120 ° C., 1.5 seconds) to form a partially strong adhesive surface. When it was dropped into water in the same manner, it disappeared in 18 seconds.

Example 2. A polyalkylene oxide compound obtained by block-adding polymerization of bisphenol A with 85% ethylene oxide and 15% propylene oxide (weight average molecular weight 20,000
0) to 100 parts of hexamethylene diisocyanate 0.
84 parts and a small amount of dibutyltin dilaurate are mixed, and 1
Urethane at 00 ° C to give a weight average molecular weight of 250,
000 polymers were obtained. This was spun in the same manner as in Example 1, and further cut into a length of 2 to 3 mm after spinning, which was processed as a non-woven fabric, and the used vacuum pump oil (containing 0.5% of water) was used. When the non-woven fabric was used as a filter, the water content was 0.02%, and it could be refined into a transparent oil, which was sufficiently used.

Comparative Example 1 When a plain fabric of polyvinyl alcohol was dropped in hot water at 80 ° C., it disappeared in about 10 seconds. However, in water at 25 ° C, the surface became wet and swelled, but it could not be completely dissolved even after 1 hour. Further, in the case of heat-sealing to form a partial adhesive surface, a portion which does not dissolve even in hot water at 80 ° C. was generated.

Example 3 The high molecular weight compound A obtained in Example 1 was put into a melt spinning apparatus, melted at 120 ° C., and 30 m from a 1 mmφ nozzle.
Spinning was performed at a winding speed of / min. The obtained yarn is a single fiber, diameter is 40 μm, and tensile strength is 200 kg / cm.
It was 2. This yarn can be drawn 13 times at 20 ° C. The drawn one has a diameter of 12 μm and a tensile strength of 390 kg.
/ Cm @ 2. Similarly, it could be drawn 20 times at 50 ° C., and a filament having a diameter of 9 μm could be produced. The tensile strength of this product was 550 kg / cm @ 2.

Comparative Example 2 When a filament having a diameter of 40 μm obtained by wet-spinning polyvinyl alcohol was drawn at 20 ° C., it could only be drawn up to twice. At that time, the diameter was 28 μm and the tensile strength was 500 kg / cm 2.

[0021]

EFFECT OF THE INVENTION Since the water-soluble fiber of the present invention has a high elongation, it is possible to obtain a fine count fiber by stretching even if a filament which is not so thin at the time of spinning is produced, and troubles during spinning such as yarn breakage. Can be prevented. Further, since it has sufficient strength and water solubility, it can be said that it can be applied to various uses.

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Claims (1)

[Claims] 1. A polyalkylene oxide compound obtained by addition-polymerizing an alkylene oxide containing ethylene oxide to an organic compound having two active hydrogen groups, and a polyvalent carboxylic acid, its anhydride or its lower alkyl ester or diisocyanate. , A water-soluble fiber comprising a high molecular weight compound having a weight average molecular weight of 10,000 or more obtained by the reaction.