JPH05125670A - Production of modified polyester fiber - Google Patents

Abstract

PURPOSE:To obtain the subject fiber having excellent moisture permeability and waterproofness by providing polyester fiber in a molten state immediately after spinning with protein. CONSTITUTION:Polyester fiber in a molten state (preferably <=350 deg.C) immediately after spinning is immersed in 0.3-40wt.% solution of protein preferably at 70-150 deg.C in a short time and the fiber is provided with protein to give modified polyester fiber having excellent handle, moisture permeability and waterproofness. A polyester especially blended with a polyester containing an unsaturated bond is preferable as the polyester fiber.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a modified polyester fiber which gives a fabric having improved moisture permeation and waterproof property and texture by adding protein thereto.

[0002]

2. Description of the Related Art Polyesters used industrially today have a high degree of crystallinity and a high softening point, and are excellent in strength, chemical resistance, heat resistance, weather resistance and electric insulation resistance. Due to its properties, it is widely used for fiber applications, as well as for films and molded products, but since it responds to the diversified applications in recent years, there is an increasing demand for polyester fibers with various functionalities. It ’s just.

In particular, there are many demands for moisture-permeable and waterproof properties, and in order to meet these demands, a film having fine pores is attached to the surface of a cloth, or a resin containing a protein is attached to the surface of the cloth. Methods such as coating have been proposed.

However, it is technically difficult to form a large number of fine pores of about 0.5 to 5 μm on the surface of the film by the above method, and it is technically difficult to form the film with high moisture permeability and waterproof property. However, there are problems that the film may be removed due to frequent cleaning and friction, and that the number of steps is large and the cost is high.

[0005]

DISCLOSURE OF THE INVENTION The present invention solves the above-mentioned problems, imparts a protein to a yarn by an extremely simple method, improves moisture permeability and texture, and improves the texture. It is a technical object to provide a method for producing a modified polyester fiber that provides a fabric that is hard to drop off and has good durability.

[0006]

Means for Solving the Problems As a result of intensive research to solve the above problems, the present inventors have found that, in melt spinning of polyester, the yarn immediately after spinning can be easily immersed in a protein solution. They have found that they can be modified by proteins and have reached the present invention.

That is, according to the present invention, when melt-spinning polyester, the yarn in a molten state immediately after spinning is
A gist of the present invention is to provide a method for producing a modified polyester fiber, which comprises introducing the protein into a protein solution of 3 to 40% by weight to impart the protein to the yarn.

The present invention will be described in detail below. In the present invention, the spun yarn in a molten state is introduced into a solution bath containing a protein solution and allowed to pass while being dipped, and the protein is applied to the yarn and wound up.

The yarn temperature at which the protein is attached to the melt-spun yarn is required to be higher than the melting point of the polyester because the molten polyester is soaked in the protein solution to react. Thus, the reaction proceeds at a temperature above the melting point, but if the temperature becomes too high, the polyester is thermally decomposed and the yarn is cut, so 350 ° C. or less is preferable. Further, at a temperature below the melting point, the protein is not sufficiently attached to the yarn and does not react, which is not preferable. The conditions for immersing in the protein solution before the polymer solidifies depend on the spinning speed and the cooling conditions, but the concentration of the protein solution, the temperature, and the immersing time may be appropriately selected.

The concentration of the protein solution is 0.3% by weight
As described above, 40% by weight or less is necessary, and 1 to 20% by weight is preferable. Solubility varies depending on the protein used or depending on the solvent, but if it exceeds 40% by weight, excessively adhered protein will fall off in the post process such as stretching process and processing process, which may cause contamination of rollers, heaters, guides, etc. .. On the other hand, if it is less than 0.3% by weight, the amount of protein attached to the yarn is too small to exert various properties of the protein, and the intended modified polyester fiber cannot be obtained.

The temperature of the protein solution is preferably 70 to 150 ° C. If the temperature is below this temperature, it will be too rapidly cooled, and the reactivity will be low.
Moreover, above this temperature, the decomposition of proteins is likely to occur.

The dipping time is preferably 0.05 to 1 second, particularly 0.1 to 0.5 second. When the dipping time is longer than that, the yarn becomes below the melting point, so that the adhesion and reactivity of the protein decrease.

The amount of protein attached to the yarn is preferably 0.1 to 5% by weight of the protein attached to the yarn. If the amount is less than this amount, the effect of imparting various properties of the protein is small, and If the amount is too high, protein loss occurs.

Examples of the polyester in the present invention include polyethylene terephthalate and polybutylene terephthalate, and these include isophthalic acid, 5-sodium sulfoisophthalic acid, adipic acid, trimellitic acid, diethylene glycol, propylene glycol and 1,4-butane. It may be a copolymer of diol and pentaerythritol. In order to firmly attach the protein to the polyester fiber, it is effective to use a polyester fiber in which an unsaturated bond is introduced by copolymerization or a polymer having an unsaturated bond is blended. Examples of the polyester having such an unsaturated bond include those obtained by copolymerizing itaconic acid, maleic acid and the like, and those obtained by copolymerizing itaconic acid in an amount of 1 to 5 mol% are preferable in terms of operability. The fiber in the present invention may be a single component fiber or a composite fiber made of polyester as described above.

The protein solution used in the present invention is a protein solution such as polypeptide, gelatin, collagen and casein dissolved in water or an organic solvent. Examples of the solvent include polyethylene glycol, dimethyl sulfoxide, water, dimethylformamide, tetramethylene glycol and the like, but the solvent is not particularly limited as long as it dissolves the protein. However,
Polyethylene glycol (PEG) for the reasons described below
Alternatively, a dimethyl sulfoxide (DMSO) solution is more effective.

[0016]

In the present invention, the reason why the protein is firmly attached to the yarn and is difficult to drop off is considered to be as follows. That is, the polyester in the molten state is decomposed by heat and has a large number of radicals and active groups, and thus has a high reactivity. Therefore, the polyester and the protein can be easily reacted by contacting with the protein solution in this state. At this time, by using a solvent having a good affinity with polyester (PEG, DMSO, etc.), more effective addition is performed.

[0017]

EXAMPLES Next, the present invention will be specifically described by way of examples. Each physical property was evaluated by the following methods. (Intrinsic viscosity) An equal weight mixture of phenol and ethane tetrachloride was used as a solvent, and measurement was carried out at 20 ° C. (Melting point) Differential running calorimeter (DSC) manufactured by Perkin Elmer
-2 type) was used and the measurement was performed at a temperature rising rate of 20 ° C / min. (Moisture permeability) 40 ° C according to JIS Z0208 cup method,
It was measured at 90% RH. The sample is 170 thread diameter / 2.54c
A woven fabric having a weft density of 100 / 2.54 cm was used. (Water repellency) As a method for evaluating the effect of waterproofness, JIS
L1092 (2) (water repellency test) was performed and evaluated by JIS standard water repellency rating. The sample used the same fabric as that used for breathability. (Handle) 50 men and women in their 10s to 50s were asked to touch the woven fabrics that had been spun under the conditions of the examples, and those with a good texture were rated as ○, and those with a poor texture were rated as ×, Is 45 ~
Those with 50 were evaluated as O, those with 35 to 44 were evaluated with Δ, and those with 34 or less were evaluated with X.

Example 1 Polyethylene terephthalate having an intrinsic viscosity of 0.64 (melting point: 26
0 ℃) is melted at 300 ℃ using a normal melt spinning device,
Extruded from a spinneret with 12 nozzles. The extruded melted yarn was passed through a 2 wt% gelatin PEG solution bath (dipping distance 2 m) controlled at 80 ° C., which was placed 10 cm from the spinneret, at a speed of 1200 m / min (dipping time: 0.
It was rolled up in 1 second). The yarn temperature immediately before immersion was 270 ° C. After that, a drawn yarn of 75d / 12f was obtained through a drawing process. The woven fabric using the obtained polyester fiber had a good texture and excellent moisture permeability.

Examples 2 to 4 and Comparative Examples 1 to 3 Polyester, protein types, and spinning conditions were set as shown in Table 1, and the texture, moisture permeability and waterproofness were evaluated. Polybutylene terephthalate has a melting point of 230 ° C and 5 mol%
The itaconic acid-copolymerized PET had a melting point of 240 ° C. Also,
The amount of protein attached to the yarn in the examples and comparative examples was 0.5 to 1% by weight of the yarn.

[0020]

[Table 1]

As is clear from Table 1, the fabrics made from the modified polyester fibers obtained in Examples 2 to 4 of the present invention had a good texture. Also, polyester fiber is 98 ℃
There was no loss of protein when treated in boiling water. On the other hand, the woven fabrics from the modified polyester fibers obtained in Comparative Examples 1 and 2 had poor texture and poor moisture permeability. Further, in Comparative Example 3, white powder was generated on the stretching roller and the heat plate during stretching, and the operability was extremely poor.

[0022]

As described above, according to the method for producing a modified polyester fiber of the present invention, by adding a protein, it is possible to provide a fabric excellent in moisture permeation and waterproof property, improved in texture and free from protein loss. It is possible to obtain high quality polyester fiber.

Claims (1)

[Claims] 1. A modification characterized in that, when melt-spinning a polyester, a yarn in a molten state immediately after spinning is introduced into a protein solution of 0.3 to 40% by weight to give a protein to the yarn. Polyester fiber manufacturing method.