JPH04136219A - Antipilling polyester conjugate fiber - Google Patents

Abstract

PURPOSE:To provide the subject conjugate fiber having excellent antipilling property and abrasion resistance by employing a specific polyester consisting mainly of ethylene terephthalate units as a sheath component and a polyester comprising ethylene terephthalate units as a core component. CONSTITUTION:The objective conjugate fiber contains a polyester having an intrinsic viscosity of <=0.36 and consisting mainly of ethylene terephthalate units containing phosphorus atoms in an amount of 0.5-1.5mol%, based on all acid components as a sheath component and a polyester consisting substantially of ethylene terephthalate units as a core component. The introduction of the phosphorus atoms into the polyester molecule may be performed e.g. by adding a phosphorus compound of the formula ((n) is 3-8) to the polyester at the polymerization step thereof.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a polyester composite lmm with soaked anti-pilling properties and good abrasion resistance.

Conventional technology> Polyester Takao. In particular, polyester woven fabrics mainly made of polyethylene terephthalate are used for clothing.

Widely used for industrial materials, interiors, etc. However, when it is used for clothing, it has the disadvantage that pilling and sagging occur easily due to its high strength, which significantly impairs the appearance of clothing.

Therefore, at present, Japanese Patent Application Laid-open No. 135331/1983,
As disclosed in JP-A No. 61-47818,
After making polyester by copolymerizing phosphate ester bonds into fibers, we hydrolyze the phosphate ester bonds by treating them with hot water, reducing the strength of ruts and pheasants, and imparting anti-pilling properties. As disclosed in Japanese Patent No. 18447, efforts have been made to heat-treat polyester fibers copolymerized with a phosphorus compound to lower fiber strength and improve pill resistance.

However, on the other hand, it is difficult to achieve a balance between anti-build properties and abrasion resistance suitable for practical use in clothing, etc., and it is difficult to obtain clothing with appropriate abrasion properties by improving anti-build properties and snagging properties. This has become difficult and improvements are desired.

Problems to be Solved by the Invention> The present invention is as follows. The technical object of the present invention is to provide a polyester composite steel having excellent build resistance and good abrasion resistance.

As a result of intensive study to solve the above problem, the inventors of the present invention have arranged a core-sheath type composite delicate sheath component made of modified polyester, and The present inventors have discovered that this object can be achieved by using a polyester with good am strength.

That is, one aspect of the present invention has an intrinsic viscosity of 0.36 or less.

This is a polyester conjugate fiber whose core component is a polyester hydrolyzed fiber mainly composed of ethylene terephthalate units, which is rich in phosphorus atoms by 0.5 to 1.5 moles based on the total acid component.

The polyester constituting the sheath component in the composite weave edge of the present invention must contain 0.5 to 1.5 molar phosphorus atoms based on the total acid component, and the polyester must have an intrinsic viscosity of 0. Must be 36 or below and must be IL. Composite 1 of the present invention, which will be described later, has a phosphorus content of 0.5 mol.
In the method of producing leprosy.

Water decomposition due to hot water treatment does not occur sufficiently, making it difficult to lower the intrinsic viscosity and resulting in poor pill resistance.

In addition, even if the amount exceeds 1.5 molt, the anti-build property may reach a level of 3i or the properties of other additives may be impaired. However, if the limiting viscosity exceeds 0.36, the anti-build property will not be sufficiently achieved.

A method for introducing phosphorus atoms into polyester molecules can be achieved, for example, by adding a phosphorus compound represented by the following formula (1) during the polymerization stage of polyester.

Mouth (CnHzn+IQhP-OH (j=3~8) (
1) In particular, if this phosphorus compound is of high purity with a line spacing of 964 or more, preferably 98 or more.

It is possible to sufficiently improve the process stability and pill resistance without impairing the general quality of polyester 1ψ.

More specifically, as described above, pure t964 is the above phosphorus compound, and the dialkylated phosphorus compound such as dibutyl phosphate and dibutyl phosphate. Adding polyester to polyethylene terephthalate 1a & the system that warps at step 1 of the reaction, 1 molecule A has 0.5 to 1.5 phosphorus atoms in three negative calculations.
Polyester #1 having a phosphoric acid ester combination that has a high molecular weight is prepared.

This polyester is used as a sheath component, and a polyester consisting essentially of ethylene terephthalate units is used as a core. Composite spinning is carried out according to a conventionally known method using the same amount of water, and after spinning! The limit adhesiveness of the polyester component is preferably 0.38 to 0.45, #! A composite woven fabric having a terminal group concentration of preferably 80 μeq/y or more is obtained. The composite material of the present invention can then be obtained by heat-treating the fiber at a temperature of 110° C. or higher in the presence of water to lower the intrinsic viscosity If to 0.36 or lower.

Regarding the intrinsic viscosity of the composite 11M sheath component before heat treatment,
If it is too low, yarn breakage is likely to occur, and if it is too high, a high temperature and long time treatment will be required in the heat treatment to finally control the #A limiting viscosity to 0.36 or less, which is not very preferable.

In addition, the acidic terminal group jX is 80 μeq/? Being unskinned,
When heat treatment is carried out in the presence of water at a temperature of 110° C. or higher, the limiting viscosity will not be reduced sufficiently and the anti-build property improving effect will be insufficient, which is not preferable.

Note that this acidic terminal group may be anything as long as it is acidic, such as a carboxyl group or an acidic hydroxyl group.

Methods for increasing the concentration of acidic end groups to 80 μeq/y or more include adding water after polyester polycondensation is completed and before melt spinning, or adjusting the chip drying conditions to make the chip moisture content higher than usual and re-rolling. There are methods such as polyester hydrolysis such as melting, and methods in which esterification in the polyester polymerization stage is suppressed to a low level to increase the number of carboxyl groups remaining in the polyester.

Further, the heat treatment temperature is preferably 110°C or higher.

In particular, the temperature is preferably 120°C or more and 180°C or less.

If it is less than 110°C, it is not preferable because it takes a very long time to reduce the ultimate viscosity or the ultimate viscosity tends to be 0.36 or less. This heat treatment is applied immediately after melt spinning to final products such as iron proboscis, 4I products, sewn products, etc.! Although it may be done on the i floor, it is convenient to use the high temperature hot water treatment that is applied in the dyeing process in step 4.

In the present invention, the reason why the phosphorus compound represented by the formula t6, t/':, ut shows the anti-pilling property improvement effect is not clear, but when the phosphorus compound represented by the formula (1) is classified into polyester, It reacts with the polyester and the phosphorus atoms are incorporated into the polyester main layer via phosphate ester bonds. Most of the phosphorus atoms have three phosphate ester bonds, which act as a trifunctional branching agent and make the polyester branch, but some remain unreacted and form alkoxy groups and phosphoric acid water! It is incorporated into the main chain with a group. Since it is a branched polymer, polyester has phosphate ester bonds that are easily hydrolyzed, and when heat treated in the presence of water, the phosphate ester bonds are easily hydrolyzed, increasing the degree of polymerization of the polyester. decrease, and the dispersive end groups such as phosphorus inertial hydroxyl groups and carboxyl 4 in polyester promote hydrolysis of phosphate ester bonds, which work synergistically to improve pill resistance? This is considered to be an indication.

Next, the polyester constituting the core component of the composite iron embroidery of the present invention is actually a polyester consisting of ethylene terephthalate units, and polyethylene terephthalate is preferably used. However, there is no problem in containing a small amount of a copolymer component as long as the object of the present invention is not impaired.

The composite ratio of this core component and the sheath component is sheath/core = 30~
It is preferable that it is 70/70-30.

In addition, a matting agent, a flame retardant, and a deodorizing/antibacterial agent are added to at least one of the core and sheath of the composite iron embroidery of the present invention.

A fragrance, a far-infrared emitting substance, etc. may be added as appropriate depending on the purpose.

In the present invention, the intrinsic viscosity refers to a value (unit: 1/2) measured at 30° C. using a mixed solvent of equal weights of phenol and tetrachloroethane. The acidic end group concentration is determined by dissolving the polyester in benzyl alcohol, diluting it with chloroform, and then neutralizing it with sodium hydroxide using phenol as an indicator.
Polyester (expressed in μeq/ri in the specification).

<Example> Hereinafter, the present invention will be specifically explained with reference to Examples.

In the examples, "parts" means parts by weight.

Example 1 990 parts of dimethyl terephthalate, 790 parts of ethylene glycol, and 0.2 parts of zinc acetate were charged into a rectification-resistant reaction tank, and kept silent for 3.5 hours while stirring. During this time, the methanol produced is distilled off through a rectification column.
The temperature was raised to 0 to 230°C, and ester exchanger 3 was completed. Then, the reaction product was transferred to a single reaction vessel, and 10.7 parts of di-n-butylphosphate 1-1 (purity 974) was added.
$1. ) In the case of 100-, the phosphorus atom content in the main polyester corresponds to 11.0 mol. °C, pressure 0.5, tll H? at 2.5:5
Due to the heavy compatibility, the layer-limiting viscosity is 0.52 and the phosphorus atom content is 1.
A polyester containing 1.0 mol 4 and diethylene glycol (hereinafter abbreviated as DE) of 3.0 mol was obtained.

This was extruded from Polymerization Reaction 1 to obtain polyester chips.

The chip obtained here and a polyethylene terephthalate (PET) chip with an intrinsic viscosity of 0.62 were separately melted, and the PET was placed in the core. ! [Total pressure rate 5015
0 (sheath/core) was spun using a normal composite spinning device, drawn, and rolled to produce composite iron 4 (intrinsic viscosity of sheath component 0.42, final spinning group concentration 100 μeq). /P,!J
Contains 1.0 tin, single denier fineness 2 denier, embroidery length 51
Shoes, crimps number 12/inch, crimps 10% 1 fiber strength 6
．． Of).

Using this obtained polymerized f11.7d1, a 30 count spun yarn was produced, and this spun yarn was used to make a tubular knitted fabric.
It was treated with hot water at 30°C for 60 minutes.

The strength of the 5it441 after hot water treatment is 4. υノ,
Further, the intrinsic viscosity of the sheath component was 0.34.

In this paper, we conducted a pilling test on a tubular knitted fabric treated with hot water according to method A of JISL-1076-1978. The pilling property of the tubular knitted fabric was grade 4. JISL1079D
Even in terms of wear resistance by the Acmore rotor method,
Before hot water treatment, the abrasion strength was less than 4 inches, and after hot water treatment it was 7%.

Examples 2-5. Comparative Examples 1 to 4 Various composite fibers as shown in Table 1 were obtained in the same manner as in Example 1, and tubular knitted fabrics were created using the spun yarns made of these Aeo, and heat treated at 130°C for 60 minutes. did. Also, we decided to evaluate pilling using the same aircraft as in Example 1. The results are shown in Table 1.

As a comparative example, the sheath component has an intrinsic viscosity of less than 0.36 (
In Comparative Example 1), yarn breakage occurred in the sanitizing machine and spinning was impossible.

Also, the sheath component g! , '4 Viscosity exceeding 0.45 (Comparative Example 2): In the manufacturing process, there was no cracking or the pilling property after treatment with bad water was not observed. , sheath component 7) If the phosphorus atom-containing heather is 0.5 molty, the intrinsic viscosity after hot water treatment will not be sufficiently reduced, and the anti-pilling improvement effect will hardly be seen. , 80 μsq.
/ less than 1, no sufficient improvement effect was observed in C pill resistance after hot water treatment.

As a result of measuring the anti-pilling property and strength of #J made of a conventionally known phosphorus atom-containing polyester alone,
Although the pilling property was good (grade 5), the fiber strength was as low as 2.42 after hot water treatment, which caused problems in practical use.

<Effects of the Invention> Composite [1] of the present invention is compatible with conventional anti-pilling hawks by arranging highly strong polynystyl as the core component and arranging phosphorus atom-containing polyester with low intrinsic viscosity as the sheath component. It has now become possible to achieve excellent building resistance and abrasion resistance, which previously had not been possible.

Patent applicant RiRashi Co., Ltd.

Claims (1)

[Claims] (1) The sheath component is polyester mainly composed of ethylene terephthalate units, which has an intrinsic viscosity of 0.36 or less and contains 0.5 to 1.5 mol% of phosphorus atoms based on the total acid component, and is substantially composed of ethylene terephthalate units. Polyester composite fiber with polyester as the core component.