JPH10158933A - Polyamide-based melt blend spinning yarn - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain the subject yarn capable of extremely reducing bending and end breakage in spinning, excellent in card passage, comprising a polyamide and a polyolefin, containing a specific amount of a both end sealing type polyethylene glycol. SOLUTION: This melt blend spinning yarn comprises (A) a polyamide such as nylon 6 and (B) one or more polyolefins selected from polyethylene, polypropylene and polybutylene and contains 0.1-5wt.% based on the component B of a both end sealing type polyethylene glycol of the formula ((n) is 10-1,000; (m) is 8-20). The blending ratio of the component A and the component B is preferably 40/60-60/40 by weight.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mixed spun polyamide fiber, and more particularly, to a mixed spun fiber having good spinning condition, excellent card passing property, and excellent needle punching property.

[0002]

2. Description of the Related Art Mixed spun fibers made of polyamide and polyolefin have improved fiber properties or have one of the fiber constituents removed, and have a specially shaped fiber sheet used for artificial leather, filters, heat insulating materials and the like. Widely used (see, for example,
243314).

However, when a polyamide and a polyolefin are melted in the same solution system and mixed and spun to produce a mixed spun fiber, there is a problem that stable spinning cannot be performed due to frequent occurrence of bending and breaking during spinning. .

[0004] Many attempts have been made to solve this problem. For example, Japanese Patent Publication No. 41-11
No. 65 proposes that the melt viscosities of the two polymers passing through the spinning nozzle be substantially the same at the same shear rate.

In the case of a mixed spun fiber comprising polyamide and polyolefin, when a web is formed and subjected to needle punching or the like to form a non-woven fabric, the card is liable to be wound around a cylinder or a doffer, and the card passing property is poor. Problem and the needle punching process,
There was a problem of poor needle punch characteristics such that the delamination strength of the nonwoven fabric did not increase.

[0006] However, the techniques proposed in the past have not been able to obtain sufficiently satisfactory card passing properties and needle punching properties.

[0007]

DISCLOSURE OF THE INVENTION The present invention improves the card passing property and the needle punching property of a mixed spun fiber comprising a polyamide and a polyolefin, and reduces the bending and breakage during spinning to improve the spinnability. The purpose is to improve.

[0008]

Means for Solving the Problems As a result of intensive studies to solve the above problems, the present inventors have surprisingly found that the addition of a double-ended polyethylene glycol to a melt-mixed system of polyamide and polyolefin. The present inventors have found that the mixed spun fibers obtained have remarkably improved card passing properties and needle punching properties, and have greatly improved spinnability, thereby completing the present invention.

[0009] That is, the present invention is a mixed spun fiber comprising a polyamide and a polyolefin, characterized in that the polyolefin contains 0.1 to 5% by weight of a double-ended polyethylene glycol based on the polyolefin. It is a polyamide-based spun fiber.

The reason why the addition of double-ended polyethylene glycol in a mixed spun fiber composed of polyamide and polyolefin improves the card passing property and the needle punching properties is not yet clear, but it is probably that double-ended polyethylene glycol is used. It is presumed that the dispersibility or compatibility between polyamide and polyolefin is enhanced, and the surface of the mixed spun fiber becomes smooth, and as a result, the friction coefficient of the fiber surface is reduced.

Similarly, the reason why bending and breakage during spinning are reduced and stable spinning can be performed is also due to the fact that the polyethylene glycol having both ends blocked increases the dispersibility or compatibility between polyamide and polyolefin. It is estimated that

That is, polyamide and polyolefin are originally heterogeneous polymers, and their mutual dispersibility or compatibility is not always good. Therefore, at the time of melt spinning, when they are discharged from the spinning nozzle, they are separated from each other, and the polyamide component is mainly carbonized as a foreign substance around the spinning nozzle of the spinneret, deposits, and causes a large number of bending and breaking. I have.

However, the addition of a polyethylene glycol having a double-ended block improves the dispersibility or compatibility between the polyamide and the polyolefin, reduces the accumulation of foreign substances around the spinning nozzle during spinning, and reduces bending and breakage. It is considered that stable spinning becomes possible.

[0014]

DETAILED DESCRIPTION OF THE INVENTION In the present invention, a polyamide is
Nylon 4, Nylon 6, Nylon 66, Nylon 7,
Nylon 610, Nylon 11, Nylon 12, Polyamide from bis (aminocyclohexyl) methane and 1,10 decamethylene dicarboxylic acid or 1,9-nonamethylene dicarboxylic acid, and these polyamides have less than 15 mol% of a third component. Examples thereof include a copolymerized polyamide and a copolymer or a mixture of two or more of them. Nylon 6 is particularly preferred.

The polyolefin is not particularly limited as long as it is soluble in a solvent such as hot toluene or a halogenated hydrocarbon, and may be at least one polymer selected from the group consisting of polyethylene, polypropylene and polybutylene. preferable.

The mixing ratio (weight ratio) of the polyamide and the polyolefin depends on the required properties and applications, but is usually preferably in the range of 25:75 to 75:25, particularly preferably 40:60 to 60:40. It is.

In the present invention, it is preferable that the polyamide and the polyolefin are mixed and dispersed in a form in which the polyamide (dispersion component) is dispersed in the polyolefin (dispersion component), since a remarkable effect can be expected. Conversely, a polyamide may be used as a dispersion medium component and a polyolefin may be dispersed therein.

Further, in the present invention, any polyethylene glycol having both ends blocked can be used.
Among them, it is preferable to use a compound represented by the following formula (1).

[0019]

## STR2 ## _{(C m H 2m + 1 COO} ) - (CH 2 - CH 2 - O) n - (COC m H 2m + 1) ··· (1) ( wherein, n 10 to 1000, m Represents an integer of 8 to 20)

The content of the double-ended polyethylene glycol is from 0.1% by weight to 5% by weight of the polyolefin.
It must be in the range of up to% by weight. If it is less than 0.1% by weight, there is no effect of adding the both-end-blocking type polyethylene glycol, and bending and breaking during spinning frequently occur.
The card permeability in the nonwoven fabric manufacturing process is poor, the delamination strength of the needle punch is increased, and the needle punch characteristics are poor. On the other hand, if the content exceeds 5% by weight, the effect corresponding to the content is not obtained, but rather, the bending and breaking at the time of spinning increase, and the card passing property and the needle punching property in the nonwoven fabric manufacturing process deteriorate. It is disadvantageous because there is a tendency. A particularly preferred range for both ends-blocked polyethylene glycol containing is 0.5 to 3% by weight.

The addition of the polyolefin and polyamide of the double-ended polyethylene glycol can be carried out by a known method. For example, before melt-spinning, polyamide, polyolefin and double-end-blocked polyethylene glycol may be powder-mixed with a blender, or a master batch in which polyolefin is preliminarily melt-added with a high concentration of double-end-blocked polyethylene glycol. It may be prepared, mixed with a polyamide and a polyolefin for dilution before melt spinning, and supplied to an extruder for melt spinning. Furthermore, polyamide and polyolefin are melted by an extruder,
Double-end-blocked polyethylene glycol as powder,
Alternatively, it may be melted and added directly to the melted polyamide and polyolefin in the extruder.

The mixed spun fiber comprising the polyamide and the polyolefin of the present invention may be, if necessary, an antistatic agent, a matting agent such as titanium dioxide, a coloring agent such as carbon black, and an antioxidant for obtaining heat stability. , A suitable amount of an additive such as a lubricant.

The spinning temperature and the spinning take-off speed are preferably from 240 to 260 ° C. and from 500 to 1500 m / min, respectively, when melt-spinning a mixture of polyamide and polyolefin to which both end-blocked polyethylene glycols have been added.

The obtained undrawn yarn is usually drawn into a mixed spun fiber having a single fiber fineness of 1 to 10 denier. The stretching temperature is preferably 40 to 95 ° C, the stretching ratio is 2 to 4 times, and the stretching speed is preferably 50 to 300 m / min.

After drawing, the web is cut to a fiber length of 25 to 200 mm, a web is made through a card, and needle punching is performed to form a nonwoven fabric. Then, the polyolefin is eluted with a soluble solvent such as hot toluene to obtain an ultrafine polyamide fiber structure, and if this structure is impregnated with a polyurethane resin or the like, good artificial leather can be obtained.

[0026]

EXAMPLES Hereinafter, the present invention will be described in detail with reference to examples, but the present invention is not limited to these examples. In the examples, parts are parts by weight. The spinnability and post-processability were evaluated as follows.

1. Spinnability (1) Foreign matter accumulation height After spinning for one day, the height of foreign matter accumulated around the spinning nozzle of the spinneret was measured. (2) Spinning breakage The number of breakage occurrences when spinning was performed for one day was counted.

2. Post-processability (1) Card-passing property The number of times the web was wound around the doffer when the card was put on a card under the conditions that the surface speed of the doffer was 35 m / min and the basis weight of the spun web was 15 g / m ^2, and the operation was performed for 1 hour. I counted. (2) Needle Punch Characteristics (Delamination Strength) After laminating card webs so as to have a basis weight of 500 g / m ² , the needle depth was 10 mm using a 36-count regular barb.
Needle punching is performed under the condition of a punch density of 1000 pieces / cm ^{2, and} the delamination strength (kg / cm) of the obtained nonwoven fabric
Was measured.

[Examples 1-4, Comparative Examples 1-2] 260 ° C
Polyethylene glycol (PEG6000: n = 1)
36) Distearate was melted at 280 ° C. to prepare a master batch of polyethylene glycol having both ends blocked.

X parts of this masterbatch, the same polyethylene (50-X) parts as used in the masterbatch,
And 50 parts of nylon 6 having a melt index of 20 measured at 260 ° C. are chip-blended and supplied to an extruder.
The temperature of the melting part and the tip of the screw was set to 270 ° C., the temperature of the spinning pack and the spinneret was set to 245 ° C., and the nozzle diameter was 0.4
The yarn was spun from a spinneret having a diameter of 160 mm and a nozzle number of 160 at a take-off speed of 700 m / min.

The obtained unspun mixed spun yarn was stretched 2.5 times at 60 ° C., subjected to mechanical crimping, and then cut into a length of 51 mm to obtain a mixed spun fiber. The single fiber fineness of the fiber was 5 denier.

This mixed spun fiber was put on a card, and further subjected to needle punching to evaluate post-processing characteristics. Table 1 shows the spinnability and post-processability.

[0033]

[Table 1]

As shown in Table 1, in the case of the method of the present invention in which the content of the both-end-blocked polyethylene glycol is 0.1 to 5% by weight, spinnability is improved, and card passing properties and needle punching properties are also improved. ing. In particular, the effect is large when the content of the both-end-blocked polyethylene glycol is 0.5 to 3% by weight.

[Examples 5 to 7] In Example 3, instead of polyethylene, polypropylene having a melt index of 30 measured at 260 ° C. was used, and water-insoluble polyethylene glycol was replaced with the compound represented by the above formula (1). And n
A mixed spun fiber was produced and the post-processing characteristics were evaluated in the same manner as in Example 3, except that the values of m and m were changed as shown in Table 2. The results are as shown in Table 2, and good spinnability and post-processability were obtained.

[0036]

[Table 2]

[0037]

According to the present invention, bending and breakage during spinning are greatly reduced, a mixed spun fiber of polyamide and polyolefin can be produced stably, and card passing property in a post-processing step can be improved. It has excellent needle punch characteristics, and can produce a high-quality nonwoven fabric with good productivity, and is extremely useful for artificial leather applications and the like.

Claims (4)

[Claims] 1. A mixed spun fiber comprising a polyamide and a polyolefin, wherein
A mixed polyamide spun fiber containing 0.1 to 5% by weight of a double-ended polyethylene glycol. 2. A polyethylene glycol having both ends blocked is represented by the following formula (1): (C _m H _{2m + 1} COO) — (CH ₂ —CH ₂ —O) _n − (COC _m H _{2m + 1} The polyamide-based mixed spun fiber according to claim 1, which is represented by the following formula (1): wherein n is an integer of 10 to 1000 and m is an integer of 8 to 20. 3. The polyamide-based mixed spun fiber according to claim 1, wherein the polyamide is nylon 6. 4. The mixed polyamide spun fiber according to claim 1, wherein the polyolefin is at least one polymer selected from the group consisting of polyethylene, polypropylene and polybutylene.