JPH04281071A - Production of polyester fiber - Google Patents

Abstract

PURPOSE:To reduce the abrasion of machines and prevent the damage of a polyester fiber on the production of the polyester fiber containing a large amount of inorganic additives. CONSTITUTION:When a polyester fiber containing inorganic additives in an amount of >=5wt.% is produced, an oiling agent containing 3-15wt.% of a trialkylamine oxide (the carbon number of each alkyl group is 1-20, and the sum of the carbon numbers of three alkyl groups is 3-30) is imparted to the fiber so that the amount of the imparted oiling agent is satisfied with the following inequality: 0.7DAngstrom -1/2Angstrom <=OPU<=3DAngstrom -1/2Angstrom [D is the fineness (denier) of a drawn single filament].

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 polyester fibers containing large amounts of pigments, matting agents, and other inorganic additives for imparting functionality.

0002

BACKGROUND OF THE INVENTION Polyester fibers exhibit excellent properties such as chemical resistance, weather (light) resistance, and wash-and-wear properties, and are widely used. And in recent years,
In order to give polyester fibers even greater added value, pigments can be added to omit the dyeing process, and conductive metal oxides and ceramics can be added to provide antistatic properties and heat retention properties. It is being said.

However, when manufacturing fibers containing large amounts of such inorganic additives, since most of the inorganic additives have hard properties, the guides used during melt spinning and drawing, There have been problems in that equipment such as rollers and heat treatment plates are subject to severe wear, and the threads are damaged due to friction with the equipment, resulting in troubles such as thread breakage during post-processing.

[0004] In order to solve this problem, the fibers are made into a core-sheath structure, with the part containing the additive serving as the core and the sheath part made of ordinary polyester. However, since these fibers use regular polyester for the sheath, the effect of additives is reduced, and the spinning equipment has a complicated structure, making the equipment expensive and the spinning process difficult. However, there was a problem in that troubles such as thread breakage frequently occurred during stretching.

[0005]

[Problems to be Solved by the Invention] The present invention is directed to a method for producing polyester fibers containing a large amount of inorganic additives, which reduces wear on equipment, prevents damage to yarns, and produces polyester fibers containing inorganic additives. The purpose is to provide a method that can be manufactured efficiently.

[0006]

[Means for Solving the Problems] The present invention solves the above problems, and its gist is as follows. When producing polyester fibers containing 0.5% by weight or more of inorganic additives, trialkylamine oxide (
Each alkyl group has 1 to 20 carbon atoms, and the sum of the three alkyl groups has 3 to 30 carbon atoms. 1. A method for producing polyester fiber, characterized in that it is imparted so as to 0.7D-1/2≦OPU≦3D-1/2 [D
is the single yarn fineness (denier) of the drawn yarn.

[0007] Below,
The present invention will be explained in detail. In general, thermoplastic synthetic fibers are treated with a spinning oil agent to increase smoothness, cohesiveness, and antistatic properties during spinning in order to improve passability during spinning and drawing processes and post-processability. However, in the case of polyester fibers, even if such a spinning oil agent is applied, the fibers themselves are harder than nylon etc., and the above-mentioned hard inorganic additives are added to the polymer, melt spinning, When stretching or processing,
Hard inorganic additives exposed on the fiber surface often wear out rollers, guides, heat treatment plates, heddles and reeds of looms in post-processing, heaters, pins, disks, etc. during false twisting.

As a result of various studies to solve this problem, the present inventors have found that in addition to the general properties of the spinning oil, ie, smoothness, convergence, and antistatic properties, the fibers to which the oil has been applied can be used as guides and It is necessary to use an oil that does not fall off even when rubbed by a heat-treated plate, etc., and has the effect of preventing the fibers from coming into direct contact with the guide or heat-treated plate, etc., and contains the above-mentioned trialkylamine oxide. The present invention was achieved by discovering that the oil agent used in this invention has such an effect.

Typical polyesters used in the present invention are polyethylene terephthalate and polyesters mainly composed of polyethylene terephthalate.

Although the method of the present invention can be applied to other thermoplastic synthetic fibers such as nylon, polyethylene, and polypropylene, the effect is not as pronounced as in the case of polyester fibers.

Inorganic additives used in the present invention include carbon black and kaolin as colorants, titanium dioxide and talc as matting agents, and additives that provide functionality such as heat retention, conductivity, antibacterial properties, and deodorizing properties. Examples of the agent include zirconium carbide, zirconium oxide, stannic oxide-based fine particles, and various ceramic fine particles.

The method of the present invention is applied to polyester fibers containing 0.5% by weight or more of such inorganic additives. For fibers containing less than 0.5% by weight of inorganic additives, it is sufficient to apply ordinary spinning oils.

Next, the oil agent, which is the most important requirement of the present invention, will be explained in detail. The base oil to which trialkylamine oxide is added is a weaving/knitting yarn oil containing a smoothing agent such as mineral oil or fatty acid ester, an emulsifier, an antistatic agent, etc., and a propylene oxide/ethylene oxide copolymer and an antistatic agent. Ordinary oils such as oils for processed yarns may be used. The trialkylamine oxide added to the oil agent is represented by the following formula.

[0014]

[Chemical formula 1]

In Formula 1, R1, R2, and R3 are alkyl groups having 1 to 20 carbon atoms, and the total number of carbon atoms of the three alkyl groups is 30 or less.

If the molecular weight of the trialkylamine oxide is too large, its compatibility with other oil components will be poor, and it may separate during spinning, resulting in loss of effectiveness or the separation material may adhere to rollers or heaters. , causing dirt. The length of the molecular chain is also important; if the molecular chain is too long in one direction, the viscosity will increase, which will have a negative effect on the fiber, which is not preferable.

[0017] The amount of trialkylamine oxide added is:
It is necessary to set the amount to 3 to 15% by weight based on the oil component. If it is less than 3% by weight, the effect of preventing wear on the guide and heater is poor, and if it exceeds 15% by weight, the effect of the oil will be reduced and smoothness, cohesiveness, etc. will be reduced, which is not preferable.

[0018] Furthermore, it is necessary that the oil adhesion amount OPU falls within the range of the above formula. The reason for this is that the smaller the filament fineness is, the larger the surface area of the fiber per unit weight is, and vice versa. This is because the amount must be changed. If OPU is greater than the range of the above formula, wear of the guide and heater will be reduced, but excessive oil will fall off and appear as heater stains and white powder, which is not preferable. On the other hand, if the OPU is less than the range of the above formula, the oil agent will fall off due to friction or abrasion, the fiber surface will be exposed, the guide and heater will be worn out, and furthermore, the strength and elongation characteristics of the fiber will decrease, which is not preferable.

[0019] The method of applying the lubricant may be either the roller lubricating method or the slit lubricating method, which is usually used.
It is not particularly limited. Further, although the oil agent can be applied from melt spinning to post-processing, especially right before a process where the machine is subject to severe wear, it is desirable to apply it during the melt spinning process from the viewpoint of process control.

[0020]

[Examples] Next, the present invention will be explained in detail with reference to Examples. Note that the characteristic values and the like in the examples were measured by the following method. (1) Extract the oil adhering to the fibers with OPU n-hexane,
After evaporation to dryness, the weight of the oil was measured and calculated. (2) Strength and elongation Measured using Tensilon UTM-4-100 manufactured by Orientic Co., Ltd., at a sample length of 50 cm and a tensile speed of 50 cm/min. (3) Strength and elongation after abrasion, needle wear condition Using the device shown in Figure 1, the yarn was brought into contact with a tubular knitting needle for 20 minutes at a yarn speed of 50 m/min, a contact angle of 150°, and a supply tension of 10 g. The strength and elongation of the resulting fibers was measured. In FIG. 1, 1 is a pirn of the sample yarn, 2 is a tension regulator, 3 is a tube knitting needle, 4 is a winder, and Y is a yarn. In addition, the treated needles were observed under a microscope to evaluate the state of wear. (4) Intrinsic viscosity [η] Using a mixed solvent of equal amounts of phenol and tetrachloroethane,
Measured at 0°C.

Examples 1 to 9, Comparative Examples 1 to 8 Intrinsic viscosity [η
]0.72 additive-free polyethylene terephthalate chips and the additives shown in Table 1 are kneaded using a twin-screw kneader at a kneading speed of 30 kg/hour and a kneading temperature of 270°C, and are made into chips. (A), (B) and (C)
I got it.

[0022]

[Table 1]

After drying these chips in a conventional manner, they were melt-spun using a conventional melt-spinning device, and before winding, a 12% emulsion of the oil shown in Table 2 was applied using a roller oiling method. An undrawn yarn with a circular cross section of 230d/36f was obtained. At this time, various combinations of chips and oils are used,
Furthermore, the rotation speed of the oil supply roller was changed as shown in Tables 3 and 4.

[0024]

[Table 2]

[0025]

[Table 3]

[0026]

[Table 4]

[0027] Next, these undrawn yarns were fed to an ordinary drawing and twisting machine, and the drawing rate was 600 m/min and the drawing ratio was 3.10.
, stretched at a preheating roller temperature of 80°C and a contact heat treatment plate (chromium plated satin finish, length 30cm) temperature of 150°C.
It was made into a drawn yarn of d/36f. 4 rolls of 3 hour paan (4
32,000 m) were sampled, and the degree of scratches and stains on the contact heat treated plates at this time were observed. Further, this drawn yarn was subjected to abrasion treatment using the apparatus shown in FIG. 1, and the strength and elongation before and after the treatment and the degree of scratches on the tube knitting needles were examined. The results of the characteristic values of the drawn yarn are shown in Tables 5 and 6.

[0028]

[Table 5]

[0029]

[Table 6]

In Tables 5 and 6, the criteria for determining scratches, etc. are as follows. Scratches on the heat-treated board ○: No scratches at all △: Slight scratches (scratches are visible only on the top of the heat-treated board) ×: Severe scratches (scratches can be seen all over the heat-treated board) Dirt on the heat-treated board ○ : Almost no dirt △ : Slight dirt visible × : Abrasion of tube knitting needles with dirt visible ○ : Almost no wear △ : Slight wear (within 2 grooves) × : Severe wear (
(3 or more grooves are visible)

As is clear from the above results, in the examples satisfying the requirements of the present invention, metal wear can be significantly prevented, and furthermore, there is little decrease in fiber strength and elongation due to abrasion. However, if the amount of trialkylamine oxide blended is small, the effect will be poor, and if the amount of oil applied is not appropriate, the effect will be poor or the heat-treated plate will become stained.

[0032]

[Effects of the Invention] According to the present invention, when drawing and post-processing polyester fibers containing a large amount of hard inorganic additives,
Damage to equipment such as heat treatment plates and guides can be prevented, and furthermore, deterioration of the mechanical properties of the fibers can be prevented.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of a yarn rubbing device for examining the wear of tube knitting needles due to yarn rubbing and the decrease in strength and elongation of yarns due to wear.

Claims (1)

[Claims] Claim 1: When producing polyester fibers containing 0.5% by weight or more of inorganic additives, trialkylamine oxide (each alkyl group has 1 to 1 carbon atoms) is added to the fibers.
20, sum of carbon atoms of 3 alkyl groups 3-30)
An oil agent containing 3 to 15% by weight of
1. A method for producing polyester fiber, characterized in that the amount (% by weight) is given so as to satisfy the following formula. 0.7D-1/2≦OPU≦3D-1/2 [D
is the single yarn fineness (denier) of the drawn yarn.