JPS5814412A - Heater wire cord - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a two-wire heater hood mainly using wholly aromatic polyether amide fiber (hereinafter referred to as ether 7-mid fiber) as the fiber for the two-wire heater cord. Heater two-wire cord is a reinforcing material for heater wires used in electric blankets, etc., and has high Young's modulus, bending fatigue resistance, heat resistance,
Dimensional stability at high temperatures is required. Conventionally, glass fibers and polyester fibers have been widely used for heater IJ hoods. Glass fiber certainly has excellent Young's modulus, heat resistance, and dimensional stability at high temperatures compared to conventional fibers, but it has problems with high cost, fiber breakage during twisting, and single fiber breakage, and poor bending fatigue resistance. The amount used is decreasing due to reasons such as insufficient performance.

Polyester fibers have excellent bending fatigue resistance, but have problems with heat resistance and dimensional stability at high temperatures.

In recent years, polyparaphenylene terephthal 7-mide fibers (hereinafter referred to as polyparafibers) have been developed, which have high strength, high Young's modulus, and excellent heat resistance and dimensional stability at high temperatures.
For example, DuPont Co., Ltd. In KEVLAR')
Two-wire heater hoods using It is true that heater wires using polypara fiber as cords have superior elastic recovery, heat resistance, and dimensional stability at high temperatures compared to cords made of glass fibers, polyester fibers, etc., but they also have excellent bending fatigue resistance. The reason why polypara fiber has poor bending fatigue resistance is that the polymer molecular chain is extremely linear and rigid, so when it is made into a fiber, the crystallinity is high, and the fiber axis is too high due to the high orientation. It is presumed that this is because interactions in the direction perpendicular to the surface tend to produce weak portions, which tends to cause so-called fibrillation.

In contrast, the present invention shows that ether amide fibers are superior to polypara fibers in terms of high strength, high Young's modulus, bending fatigue resistance, and heat resistance, and therefore, when used as a heater two-wire hood, they are even better than polypara fibers. The inventors have discovered that it is possible to provide an excellent two-wire heater cord, leading to the present invention.

Here, fully aromatic polyether 7-mid fibers are repeating units (1) to (4) [wherein, Ar, gAr, and tAr may be the same or different, and the bonding chains are coaxial or parallel. Represents axially extending aromatic carbocyclic residues, aromatic heterocyclic residues that must be joined by the ring atoms representing the maximum spacing, and combinations thereof.

Tori to Peng may be the same or different, and represent an alkyl group having 5 or less carbon atoms and a hydrogen atom.

Ar, , Ar1 may be the same or different, and may be a para-phenylene group, a meta-phenylene group,
&), and the relationship between the number of moles of repeating units is substantially K
, (1) + (4) = (21, (1)
+ (2) + (s) + (4) When the grave is 100 molti, (3) = 0 to 90 molti, (4) = 50 to
The fibers are made of a polymer having a 5 molt, preferably a (+)-s tuft of 10 mol.

Aromatic carbocyclic residues in which bond chains extend coaxially include, for example, 1,4-phenylene, 1. j'-naphthylene, etc.; the aromatic carbocyclic residue in which the bond chain extends in the parallel axis direction means, for example, 1,5-naphthylene, λ6-naphthylene, etc.

The aromatic residue is -N-N-, -N=CH-.

They may be bonded to each other by a group selected from the group consisting of -CH-CH- and -CTC-. For example, -Q-N=
N-Q--O-5C=C-Q--Q-CH=CH÷ (
Includes pen N=CH pen, etc.

Examples of the alkyl group having a carbon mass of 5 or less include a methyl group, an ethyl group, a p-kyl group, a getyl group, a pentyl group, and a methyl group is preferred.

"a v Af" in formula (4) A may be the same or different (para-phenylene group, meta-phenylene group, etc.).

The above aromatic heterocyclic residues and aromatic heterocyclic residues may have substituents bonded vertically to elementary atoms. Such substituents include hapogen groups (e.g. chlorine, bromine, fluorine)
, lower furkyl groups (e.g. methyl, ethyl, isopropyl group), lower flukoxy groups (e.g. methoxy, ethoxy group), cyano group, 7-cetyl group, nitro group, preferably chlorine group and It is a methyl group.

The fineness of Ether 7 Mido fiber is total denier 250 ~
1,500 denier and single yarn denier of 1.5 to 5 denier are preferably used. A plurality of filament threads (usually 1 to 3 threads) are used as a twisted thread cord, and a heater wire is spirally wound around the twisted thread cord to form a two-wire heater hood. A conventional ring twisting machine is sufficient for twisting the yarn. In the case of polyester fibers, stretching and heat setting of the twisted cord is required to suppress unnecessary elongation that impairs the cord properties. The number of twists is not particularly limited, but 25 to 55 T/10 degrees is usually appropriate.

Compared to conventional heater two-wire hoods, the two-wire heater hood of the present invention not only has basic mechanical properties such as high strength, high Young's modulus, and dimensional stability at high temperatures, but also has good bending fatigue resistance and Heat resistance and other essential features that cannot be obtained with conventional two-wire heater cords! It can be used for electric blankets, electric carpets, refrigerator defrosters, two-wire heater cords for preventing freezing of water supplies, two-wire heater cords for keeping oil pipelines warm, etc.

By the way, the performance of the heater cord is as follows □
It was measured by the method.

(1) The ratio of the diameter (dl) of the heater wire cord to the diameter (DCII) of the bending fatigue-resistant pulley is set as D/d=5, and the tension is 0. sj'
/det A two-wire heater cord attached to a pulley was reciprocated 10,000 times at a reciprocating speed of 60 fly, and the strength retention rate after 10,000 times was measured.

(2) Dimensional stability under high temperatures: 0 (3) Dimensional stability in a dryer with a temperature of 150°C The expansion/contraction rate was measured after being left in the locked state for 1 hour.

Examples are shown below to specifically illustrate the present invention.

Example 1 1000 denier obtained by wet spinning 1 piece of fully aromatic polyether amide fiber, 25 mol of para-phenylenedi7mine, 50 mol of terephthalic acid pride, 96 * 3 * 2 la of 4'-diamino-diphenyl ether 666 filament filament fiber (hereinafter referred to as ether amide fiber (A
) on tooo/s m5OT/1 0 cm+
(S), first twist 40T / 10cm (Z) twist configuration with a twisted yarn hood, around which heater wire Kk:VLAR) 1000 denier 666ft 5) 7th twist used A two-wire heater cord was created in the same manner as in Example 1, except that the coefficients were the same.

Table 1 shows the comparative evaluation results of performance.

Table 1 Procedural amendment document March 1980 (0th day Mr. Commissioner of the Japan Patent Office l, Indication of the case Patent application No. 1983-112260 2, Name of the invention Heater two-wire code 3 Person making the amendment Relationship to the case Patent application 1-11 Minamihonmachi, Higashi-ku, Osaka (300) Teijin Limited Representative Tomoo Tokusue 1) l] Note on page 110, line 8 of the specification: ``Except that the twist coefficients used were the same.'' is corrected to "except for the use of".

2) 1110 of the specification] [Table 1 is corrected as follows.

Table 1 that's all

Claims (4)

[Claims] (1) A heater wire cord characterized by mainly using wholly aromatic polyetheramide fiber as the fiber material. (2) Fully aromatic polyetheramide fiber t? The heater wire cord according to claim (1), consisting of the following repeating units (S to (4)) [wherein Ar, , Arc IAr, may be the same or different, and the bonding chains are both coaxial Represents aromatic carbocyclic residues extending in the direction or parallel axis direction, aromatic heterocyclic residues that must be bonded by the ring atoms representing the maximum spacing, and combinations thereof. - R,' to R6 may be the same or different, carbon, number S
Represents the following alkyl group and hydrogen atom. Ar4. Ay may be the same or different and is selected from a paraphenylene group and a metaphenylene group. The relationship between the number of moles of repeating units is essentially (l) + (4)
−(2), and (1) + (ri + (1) +
(4) When the concentration is 106 moles, (s)-o-so
mol-t (2) -” ~ 5 mol.] (3) Ar in repeating unit (1) is paraphenylene. - are both hydrogen atoms, Ar of the repeating unit (2),
is paraphenylene, Ar of the repeating unit (m) is paraphenylene, and 9 is a hydrogen atom, the heater wire cord according to claim 1 (!). (4) The tortoise R3 of repeating unit (4) is a hydrogen atom,
Ar, Kabalaphenylene, Ar, Paraphenylene/
or metaphenylene, the heater two-wire cord according to any one of claims (2) to (3).