JP2005344260A - Polyester fiber - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a polyester fiber that has excellent durability, hydrophilicity and antistaticity. <P>SOLUTION: The polyester fiber is provide with a finishing oil comprising 35-65 wt.% of [A] an epoxy compound containing two or more epoxy groups and 65-35 wt.% of [B] a polyether chain-containing amino compound represented by general formula 1. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a polyester fiber having hydrophilicity and antistatic properties excellent in durability. More specifically, the present invention relates to a polyester staple fiber that is optimal for spunlace applications.

In general, polyester fibers are widely used because they have excellent properties such as processability, ease of handling, and work recovery. In recent years, it has come to be used in large quantities not only for clothing but also for nonwovens for industrial materials and sanitary goods. In the case of non-woven fabrics, there are manufacturing methods such as needle punch and water jet, and durability against high-pressure water flow is required in spunlace applications, and surface modification of polyester fibers aimed at hydrophilicity has been proposed conventionally. For example, in Patent Document 1, polyethylene glycol diamine and polyethylene diglycidyl ether are imparted to the fiber, then heat-treated at 130 ° C. to 150 ° C. and allowed to stand at room temperature for 24 hours, and then a polycondensate of polyethylene glycol and terephthalic acid is imparted. A method for producing a hydrophilic synthetic fiber has been proposed, but it is not practical because the operation is complicated and it is necessary to leave it for a long time. Patent Document 2 proposes a method in which a hydrophilic copolyester, an epoxy compound and an aminosilane compound are added and heat treatment is performed, and Patent Document 3 discloses an amino acid composed of epoxy glycol siloxane and aminosilane or a silicone quaternary ammonium compound. A method using a functional compound has been proposed. However, since a portion having water repellency is included in the molecule, there may be a case where sufficient hydrophilicity cannot be obtained when the mixing ratio is uneven in production.
JP 53-134992 A JP 62-162077 A JP 2001-226878 A

  An object of the present invention is to provide a polyester fiber having hydrophilicity and antistatic properties that are excellent in durability, and specifically, a polyester short fiber that is optimal for spunlace applications.

The present invention employs the following means in order to solve the above problems.
That is, a polyester fiber characterized by being provided with an oil agent containing 35 to 65 wt% of the following component [A] and 65 to 35 wt% of the following component [B].

[A] Epoxy compound having two or more epoxy groups [B] Amino compound having a polyether chain represented by the following general formula 1

(In the formula, R1 and R2 are alkylene groups having 1 to 10 carbon atoms and may be the same or different. R3 is a polyoxyalkylene chain, which is a block of a plurality of types of alkylene chains or a random copolymer. X is an element having three or more bonds, and n is a natural number determined by the number of bonds in X.)

  According to the present invention, it is possible to provide a polyester fiber having hydrophilicity and antistatic property excellent in durability, and more specifically, a polyester short fiber that is most suitable for spunlace use.

  In the polyester fiber of the present invention, [A] an epoxy compound having two or more epoxy groups and [B] an amino compound having a polyether chain are used to impart hydrophilicity and antistatic properties with excellent durability. It is fixed to.

  The [A] epoxy compound used in the present invention is an epoxy compound having two or more epoxy groups. Such an epoxy compound preferably has a polyoxyalkylene chain in the molecule, and examples of the polyoxyalkylene chain compound include polyoxyethylene, polyoxypropylene, a copolymer of polyoxyethylene and polyoxypropylene, polyoxyethylene and Polyether polyol, polyoxyethylene and / or polyoxypropylene, which is a polymer of polyoxypropylene and / or mono- or polyhydric alcohol (aliphatic, alicyclic, aromatic) having 1 to 30 carbon atoms and carbon number Polyester polyol which is a polymer of 1 to 30 mono- or polyvalent carboxylic acids (aliphatic, alicyclic, aromatic), polyoxyethylene, polyoxypropylene and polyhydric alcohol having 1 to 30 carbon atoms (aliphatic , Alicyclic, aromatic) and polyvalent carboxylic acids having 1 to 30 carbon atoms (aliphatic Polyester ether polyol, polyoxyethylene and / or polyoxypropylene, which is a polymer of alicyclic and aromatic), and a condensate of 1 to 30 carbonic acid esters (aliphatic, alicyclic, aromatic) A polycarbonate polyol is preferred. The molecular weight of the oxyalkylene chain compound is preferably from 100 to 10,000.

  The [B] amino compound used in the present invention is a compound having two amino groups and a polyoxyalkylene chain, as shown in the following general formula 1.

  In the formula, the linear alkylene chain represented by R1 and R2 has 1 to 10 carbon atoms, and preferably 4 to 6 carbon atoms. When the number of carbon atoms is less than 1, that is, having no alkylene chain, the degree of freedom of the amino group is low, and the crosslinking reaction with the epoxy compound does not proceed sufficiently, so that hydrophilic durability may not be obtained. On the other hand, when the number of carbon atoms exceeds 10, the ratio of hydrophobic groups in the whole molecule increases, so that hydrophilicity cannot be exhibited. The alkylene chain is preferably a straight chain alkylene group having no branched chain. When there is a branched chain, not only does the hydrophobicity become high and hydrophilicity is not sufficiently obtained, but the branched chain may inhibit the reaction of the amino group and sufficient durability may not be obtained.

  In the formula, the oxyalkylene of the polyoxyalkylene chain represented by R3 is preferably polyoxyethylene, polyoxypropylene, or a copolymer of polyoxyethylene and polyoxypropylene. The terminal of the polyoxyalkylene chain is preferably hydrogen, an alkyl ether with a mono- or polyhydric alcohol having 1 to 5 carbon atoms, or an alkyl ester with a mono- or polycarboxylic acid having 1 to 5 carbon atoms. If the alcohol and carboxylic acid have more than 5 carbon atoms, sufficient hydrophilicity may not be obtained. The molecular weight of the polyoxyalkylene chain R3 is preferably 100 to 10,000. Moreover, it is preferable that the ratio of an oxyalkylene chain occupies 30 to 95 weight% in a molecule | numerator, 50 to 90 weight% is further more preferable, and 60 to 85% is especially preferable. When the molecular weight of the oxyalkylene chain is less than 100 or the ratio is less than 30% by weight, the initial hydrophilicity is somewhat inferior, and conversely, the molecular weight of the oxyalkylene chain exceeds 10,000, or the ratio is 95% by weight. If it exceeds 50%, durable hydrophilicity may not be sufficiently obtained.

  In the formula, the central portion of the amino compound represented by X is an element having three or more bonds, and nitrogen or carbon is preferable.

The mixing ratio of the components [A] and [B] needs to be [A] / [B] = 35/65 to 65/35 in order to sufficiently advance the crosslinking reaction and obtain good hydrophilicity. Yes, [A] / [B] = 40/60 to 60/40 is preferable.
In the present invention, if necessary, an antistatic agent, a smoothing agent, an emulsifier, or the like can be used in combination as the other component [C]. In that case, in order to obtain the ratio of the essential components [A] and [B] and good hydrophilicity, it is preferable that ([A] + [B]) / [C] ≧ 5/5.

  The polyester fiber in the present invention means a high molecular polymer produced by a condensation reaction of terephthalic acid and ethylene glycol, trimethylene glycol or butylene glycol, and a copolymer thereof, as well as sebacic acid, adipic acid, trimellitic acid, isophthalic acid. Examples include a high-molecular polymer produced by a condensation reaction of an acid, p-hydroxybenzoic acid and the like with ethylene glycol, trimethylene glycol or butylene glycol, and a copolymer thereof, and a polyester polymer containing other polyesters. It is not particularly limited.

  Moreover, the form of the fiber is not particularly limited, but short fibers suitable for the nonwoven fabric for spunlace are preferred, and specific preferred embodiments are as follows. The single fiber fineness is preferably 0.1 to 100 dtex, and more preferably 1 to 10 dtex. The fiber length is preferably 10 to 1000 mm, more preferably 20 to 100 mm. The number of crimps is preferably 5-20 crests / 25 mm, and the degree of crimp is more preferably 10-30%.

  In the present invention, the amount of the oil agent attached to the polyester fiber is not particularly limited, but generally the fiber weight ratio is preferably 0.01 to 10% by weight, more preferably 0.1 to 5% by weight, More preferably, it is 1% by weight.

  The method of applying the oil to the surface of the polyester fiber is not particularly limited, and it can be applied by a method such as a dip / nip method, a kiss roller method, or a spray method.

Hereinafter, the present invention will be described more specifically with reference to examples. The permeation time and card withstand voltage were determined by the following methods.
(1) Penetration time 0.7 g of the opened sample cotton is rounded into a sphere with a diameter of 20 to 25 mm, gently floated on pure water at 20 ° C., and the time until the sample completely sinks below the water surface is measured. Judgment was made as follows.

Excellent (◎): Within 10 seconds Good (○): 11 to 60 seconds Poor (△): 61 to 180 seconds Poor (×): 181 seconds or more The penetration time was evaluated after washing 10 times as an evaluation of washing durability. The same determination was performed using the sample. As a washing method, use a washing liquid at 40 ° C. containing a neutral detergent at a rate of 1 g / l. Put the sample raw cotton into a fine net in a household washing machine, wash for 15 minutes, dehydrate for 1 minute, and wash liquid. This was repeated 10 times.
(2) Card-carrying voltage 300 g of sample cotton was allowed to stand for 12 hours under conditions of a temperature of 30 ° C. and a relative humidity of 40%, and then running at a speed of 50 m / min in the card process under the temperature and humidity conditions. The charged voltage at 10 cm on the web was measured and judged in the following four stages.

Excellent (◎): | Battery voltage | ≦ 50V
Good (○): | Battery voltage | = 51 to 500V
Defect (△): | Battery voltage | = 501 to 1000V
Impossible (x): | Battery voltage |> 1000V
[Examples 1 and 2 and Comparative Examples 1 to 5]
The sample cotton is an oil containing polyester-washed cotton (single fiber fineness 2.2 dtex, fiber length 51 mm, crimp number 16 crests / 25 mm, crimp degree 22%) and each component in the weight percentage shown in Table 1. The oil was applied by spraying so as to be 0.5% by weight with respect to the fiber, and heat treatment was performed at 150 ° C. for 15 minutes.

  Diglycidyl ether of an ethylene glycol 9 mol adduct represented by the following chemical formula (2) is used as the epoxy compound of the component [A], and an amino-modified polysiloxane represented by the following chemical formula (3) is used as the amino compound of the component [B]. An ether compound was used.

  In Example 2 and Comparative Example 5, an alkyl phosphate K salt was mixed and used in addition to the above components.

  These sample cottons were used to evaluate the above (1) and (2). The results are shown in Table 2. In the examples of the present invention, ◎ (excellent) and ○ (good) were regarded as acceptable.

  As a result, the polyester fibers of Examples 1 and 2 both had good durable hydrophilicity and antistatic properties, whereas the polyester fibers of Comparative Examples 1 to 5 did not show good results.

  The polyester fiber of the present invention can be widely applied to fields where hydrophilicity and antistatic properties are required. Especially suitable for spunlace applications.

Claims (4)

A polyester fiber provided with an oil agent containing 35 to 65% by weight of the following component [A] and 65 to 35% by weight of the following component [B].
[A] Epoxy compound having two or more epoxy groups [B] Amino compound having a polyether chain represented by the following general formula 1

(In the formula, R1 and R2 are alkylene groups having 1 to 10 carbon atoms and may be the same or different. R3 is a polyoxyalkylene chain, which is a block of a plurality of types of alkylene chains or a random copolymer. X is an element having three or more bonds, and n is a natural number determined by the number of bonds in X.) The polyester fiber according to claim 1, wherein the polyoxyalkylene chain R3 of the component [B] occupies 30 to 95% by weight in the molecule. 2. The polyester fiber according to claim 1, wherein the component [A] is diglycidyl ether. The polyester fiber according to claim 1, wherein X of the component [B] is nitrogen and n is 1.