JPH06322653A - Three-dimensional fiber assembly - Google Patents

Abstract

PURPOSE:To obtain a three-dimensional fiber assembly reutilizing a reclaimed thermoplastic resin. CONSTITUTION:The three-dimensional fiber assembly is obtained by adding 1-100 pts.wt. olefinic resin and/or vinylic resin to 100 pts.wt. reclaimed thermoplastic resin, melt mixing the resins and spinning the resultant mixture and has a high compressive strength and hardly any permanent set in fatigue.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a waste resin which has been incinerated and discarded until now, such as resin molded products of used products due to environment and resource problems, defective products generated in the manufacturing process and scraps. The present invention relates to a three-dimensional fiber assembly that is reused.

[0002]

2. Description of the Related Art Many methods have been proposed for producing a three-dimensional fiber assembly using a thermoplastic resin. For example, when a yarn in a molten state is naturally dropped from a nozzle, the yarn is drawn at a slower speed than that, and then rapidly cooled and solidified, or a method of vibrating the nozzle based on these manufacturing methods, ventilation. There is a method in which the yarns are fused with each other using a take-up machine provided with a sex conveyor and equipped with an air suction device.

As the raw materials used for these, a new resin whose molecular weight and viscosity have been adjusted is used, and the viscosity and hue are not uniform, waste mixed with impurities, and recycled resin are not used. By the way, until now, used resin molded products, defective products generated in the manufacturing process, and scraps have been incinerated and discarded. However, at present, there is a strong demand for reuse from the viewpoint of environment and resources.

[0004]

DISCLOSURE OF THE INVENTION The present invention uses a used resin that has been discarded up to now as a raw material to form a three-dimensional fiber aggregate, drainage material for civil engineering such as underdrain, embankment, and retaining wall backfilling. Providing a three-dimensional fiber assembly that has sufficient strength, performance, and adhesiveness between fibers required even when used as a cushion member such as a bed, reusing resources, reducing waste that causes environmental problems, The purpose is to promote cost reduction.

[0005]

In order to solve the above-mentioned problems, the present invention takes the following means. That is,
The present invention adds 1 to 100 parts by weight of one or two or more kinds of an olefin resin and / or a vinyl resin to 100 parts by weight of a thermoplastic resin, melt-spins and spontaneously drops,
A three-dimensional fiber assembly characterized in that a large number of yarns or filaments obtained by folding are point-bonded to each other.

The present invention will be described in detail below. In the present invention, as the thermoplastic resin, the reusable raw material resin of the resin molded product which has been discarded as it is after use is preferably used. Any of those having mechanical strength capable of withstanding the strength required as a recycled thermoplastic resin as a base material in melt extrusion in which a large number of yarns or filaments are spun from a nozzle and spontaneously dropped and folded. Good, for example, a recycled thermoplastic resin composed of a homopolymer or a copolymer selected from nylon thread, polyester thread, and acrylonitrile-based resin is preferable. Above all, it is used in a large amount as a resin bottle and other molded articles and is easy to collect and select. Polyester and polyamide resins, which are also excellent in chemical resistance, are suitable.

Next, 1 to 100 parts by weight of one or more kinds of olefin resin and / or vinyl resin must be added to 100 parts by weight of the thermoplastic resin. This is to increase the viscosity of the regenerated thermoplastic resin whose viscosity has decreased. Here, a small amount of a high molecular weight substance having poor compatibility with the recycled thermoplastic resin, such as an olefin resin and / or a vinyl type resin, is added because a high molecular weight substance reactive with an end group is added. This is because the melt viscosity in the shear region can be easily increased.

When the amount is less than 1 part by weight, the viscosity is low and the yarn is thin, and the solidification is fast, the adhesiveness between the filaments is low, and the compressive strength, deflection and recovery are insufficient. Not preferable. On the other hand, if the amount exceeds 100 parts by weight, polyester, polyamide, etc. used as the recycled thermoplastic resin will have unstable filaments spun from the nozzle due to the poorly compatible olefin resin, and continuous filaments will be obtained. It becomes difficult to obtain the desired three-dimensional fiber aggregate, which is not preferable.

The olefin resin is preferably a thermoplastic resin composed of a homopolymer or a hycopolymer selected from polyethylene and polypropylene. As the vinyl resin, polyvinyl chloride, polyvinylidene chloride, polystyrene and copolymers thereof are preferable. These olefin resins and / or vinyl resins are added singly or in combination of two or more. It should be noted that it is limited to a range that does not adversely affect the recycled thermoplastic resin. Also,
Fiber reinforcement, to the extent that the properties of the three-dimensional fiber assembly are not impaired
Fillers, colorants, stabilizers, crystallization accelerators and other various agents may be blended at appropriate times.

As a method for mixing the regenerated thermoplastic resin as a base material of the three-dimensional fiber assembly of the present invention with the olefin resin and / or vinyl resin, these resins are dry blended and directly supplied to an extruder, A method of melt-mixing with an extruder and spinning out a large number of yarns or filaments from a nozzle, or dry-blending these resins and then melt-mixing with an extruder to prepare pellets, and then using these yarns or There is a method in which a large number of filaments are spun from a nozzle and are naturally dropped and folded to perform melt extrusion.

[0011]

In the present invention, by adding an olefin resin and / or a vinyl resin and / or a vinyl resin to the recycled thermoplastic resin as the base material of the three-dimensional fiber assembly,
The melt viscosity of the recycled thermoplastic resin rises, and many filaments or filaments are spun from the nozzle and spontaneously fall to fold. Melt extrudability is improved, the point adhesion between filaments or filaments is improved, and compression is achieved. A three-dimensional fiber assembly having excellent strength, strain, and recovery characteristics can be obtained.

[0012]

EXAMPLES The present invention will be described in detail below with reference to the examples, but the present invention is not limited thereto.
The methods for measuring various physical properties are as follows. Compressive strength Measured according to JIS K7208-1975, and the compressive strength is obtained as a value when the strain rate is 20%. Compressive residual strain rate When measuring the compressive strength of a three-dimensional fiber assembly, a load was applied until the strain amount became 1/2 of the thickness of the first sample, and then the load was removed 5 times, and then 3 hours later. The thickness of the sample is measured, and the compression residual strain rate is calculated by the following formula. Compressive residual strain rate = thickness of sample after test (mm) / thickness of first sample (mm)

The three-dimensional fiber aggregate was prepared according to the following formulation. The cylinder temperature was set at 275 ° C. with a single screw extruder with a screw diameter of 50 mm, spinning was performed from a nozzle group of 50 holes with an inner diameter of 1 mm at a discharge rate of 30 kg per hour, and cooling water was distributed 30 cm below the nozzle surface. At the same time, a pair of take-up conveyors are installed in the cooling water, and the take-up conveyors are taken into water at a speed of 0.8 m / min to obtain a three-dimensional fiber aggregate having a thickness of 3 cm and a width of 20 cm.

Example 1 Polyethylene terephthalate having a reduced viscosity of 0.7 20 parts by weight of polypropylene which is collected and crushed after the use of a container for drinking water made of polyethylene terephthalate 20 parts of polypropylene having a melt flow rate at 230 ° C. of 8 g / 10 min A three-dimensional fiber assembly was prepared under the above-mentioned production conditions by using a mixture of parts and dry blending. The results of measuring the compression characteristics of the obtained three-dimensional fiber assembly are shown in Table 1. Example 2 Example 1 except that 100 parts by weight of a recycled resin obtained by crushing defective products and unnecessary products generated during injection molding of nylon 6 having a relative viscosity of 2.5 was blended with 30 parts by weight of the same polypropylene as in Example 1 I went the same way. The results are shown in Table 1. Comparative Example 1 Example 1 except that only the recycled polyethylene terephthalate resin used in Example 1 was used and no polypropylene was used.
I went the same way. The results are shown in Table 1. Comparative Example 2 The procedure of Example 2 was repeated except that only the recycled nylon 6 resin used in Example 2 was used and polypropylene was not used. The results are shown in Table 1.

[0015]

[Table 1]

As shown in Table 1, the obtained three-dimensional fiber assembly had a high compressive strength and a large compressive residual strain rate, and was excellent in recoverability.

[0017]

EFFECTS OF THE INVENTION The three-dimensional fiber assembly using the recycled resin of the present invention has the constitution as described above, has a high compressive strength, and has a large compressive residual strain rate, which makes it difficult to settle. It is suitable as a drainage material for civil engineering such as wall lining, a cushion member such as a bed, etc., and reuses the resin such as used molded products and defective products that could not be used until now, environment, resources Can help solve problems.

Claims (2)

[Claims] 1. Addition of 1 to 100 parts by weight of one or more kinds of an olefin resin and / or a vinyl resin to 100 parts by weight of a thermoplastic resin, melt-spinning, spontaneously dropping, and folding. A three-dimensional fiber assembly comprising a large number of yarns or filaments obtained by point-bonding to each other. 2. A polyester resin as the thermoplastic resin,
The three-dimensional fiber assembly according to claim 1, wherein polypropylene and / or polyethylene resin is used as the olefin resin.