KR100488245B1 - Thermoplastic Synthetic Fiber Nonwoven Fabric and its Manufacturing Method - Google Patents

Abstract

1. The technical field to which the invention described in the claims belongs

The present invention relates to a thermoplastic synthetic fiber nonwoven fabric having excellent weather resistance used in various industrial materials and a method for producing the same.

2. The technical problem to be solved by the invention

The present invention provides a method for producing a thermoplastic synthetic fiber nonwoven fabric having excellent weather resistance at a low manufacturing cost, a simple process, and excellent operation properties.

3. Summary of the Solution of the Invention

Polyethylene terephthalate (PET) is used as a core component in composite spinning, and a copolymer or a blend of polyethylene terephthalate (PET) and polyetherene naphthalate (PEN) is used as a core component. After preparing the multifilament, the resulting sheath-type multifilament is randomly dispersed and integrated on a porous conveyor to prepare a web, and by imparting entanglement to these webs, a thermoplastic synthetic fiber nonwoven fabric having excellent weather resistance is produced.

4. Important uses of the invention

Thermoplastic synthetic fiber nonwoven fabric of the present invention is used in various construction materials, agricultural materials, automotive materials and sanitary products.

Description

Thermoplastic Synthetic Fiber Nonwoven Fabric and Manufacturing Method Thereof

The present invention relates to a thermoplastic synthetic fiber nonwoven fabric having excellent weather resistance and a method for producing the same.

Thermoplastic synthetic fiber nonwoven fabrics are used for various construction materials, agricultural materials, automobile materials, medical materials, sanitary materials, etc. because of their excellent morphological stability and thermal stability.

In addition, the thermoplastic synthetic fiber nonwoven fabric has high strength, moderate heat retention, breathability, moisture permeability, hygroscopicity and water retention, and when the material and color are properly combined, the light transmittance and the light blocking property can be adjusted, so that the interior curtain of the greenhouse It is widely used as a cover or rug for use in shading, shading and shielding, and drainage.

Such thermoplastic synthetic fiber nonwoven fabrics have been produced so far with polyester, nylon or polypropylene single resins or composite resins thereof.

Specifically, polyester, nylon, and / or polypropylene resins are applied and spun to prepare their multifilaments, and the prepared meltifilaments are randomly dispersed on a porous conveyor with high pressure air to prepare a web. After drawing and opening these, they are entangled by the thermocompression method, the needle punching method, the resin bonding method, etc., and the thermoplastic synthetic fiber nonwoven fabric has been manufactured.

The conventional thermoplastic synthetic fiber nonwoven fabric prepared as described above has a problem in that weatherability is insufficient for use in the various applications described above. Therefore, in order to improve weather resistance, various methods of incorporating additives such as antioxidants, heat resistant agents, weather stabilizers, or ultraviolet absorbers into the fibers or attaching them to the surface of the fibers by post-processing methods have been used. There is a problem.

Specifically, a general method of mixing additives such as antioxidants into a fiber is to first mix a thermoplastic chip containing no additives and a master chip containing additives, followed by melt spinning them.

In this case, the additive is thermally decomposed during the spinning process to generate a lot of smoke and the like, and the workability and workability are deteriorated. In particular, since the process of opening the spun multifilament uses a large amount of air, the smoke generated by pyrolysis of the additive causes a lot of difficulties in operation.

On the other hand, a method of adhering to the fiber surface by a post-processing method without adding an additive material such as an ultraviolet absorber in the melt spinning step has also been attempted, but the problem that the duration of durability (durability) is short and the process is complicated. Accordingly, there has been a demand for developing a technology for manufacturing thermoplastic synthetic fiber nonwoven fabric having excellent weather resistance while solving various problems described up to now.

The present invention can prevent deterioration of workability and operability due to smoke generation during the spinning process without using various additives for improving weather resistance, has a long duration of weather resistance, low manufacturing cost, and simple manufacturing process. It is to provide a method for producing a thermoplastic synthetic fiber nonwoven fabric.

The present invention relates to a thermoplastic-containing fiber nonwoven fabric having excellent weather resistance and a method for producing the same.

More specifically, the present invention provides a method of manufacturing thermoplastic multifilament by melt spinning a thermoplastic resin, a web process of randomly dispersing the prepared thermoplastic multifilament and integrating it onto a porous conveyor, and a entanglement process of imparting entanglement to a web. In manufacturing a synthetic fiber nonwoven fabric, polyethylene terephthalate (PET) as a core component as the thermoplastic multifilament, a copolymer or a mixture (Blender) of polyethylene terephthalate (PET) and polyethylene naphthalate (PEN) as a core component The present invention relates to a method for producing a thermoplastic synthetic fiber nonwoven fabric having excellent weather resistance, characterized by using a composite sheath type pleated sheath multifilament.

In another aspect, the present invention is the core constituent of the nonwoven fabric is a polyethylene terephthalate (PET) core component, the herbaceous multi-filament or copolymer (Blender) of the polyethylene terephthalate (PET) and polyethylene naphthalate of the primary component The present invention relates to a thermoplastic synthetic fiber nonwoven fabric which is a staple thereof and has a weather resistance (tensile strength retention) of 70% or more.

The present invention will be described in more detail.

The present invention is characterized in that it does not use an antioxidant, a heat resistant agent, a weathering stabilizer or an ultraviolet absorber which has been added to the inside of the fiber or adhered to the fiber surface to improve weather resistance of the conventional nonwoven fabric.

The thermoplastic synthetic fiber nonwoven fabric of the present invention is manufactured through a spinning process of melting and spinning a thermoplastic resin to produce a thermoplastic multifilament, a web (Wed) process and an entanglement process of randomly dispersing the prepared thermoplastic multifilament and integrating it on a porous conveyor. do.

In addition, by cutting the thermoplastic multifilament prepared by the above method may be produced through a process for producing a staple (web) and entanglement process to integrate these short fibers on a porous conveyor.

First of all, the present invention uses a polyethylene terephthalate (PET) as a core component in a spinning process for producing thermoplastic synthetic fibers for improving weather resistance, and uses a copolymer or a mixture of polyethylene terephthalate (PET) and polyethylene naphthalate (PEN). It is used as a component to produce a compound-like multi-filament by complex spinning them.

Since PEN has a higher secondary glass transition temperature (Tg) than PET, when PEN and PET are copolymerized or mixed as a primary component during composite spinning, various conventional additives are not added in the melt spinning step or adhered to the fiber surface in the post-processing process. It is possible to impart semi-permanent weather resistance to long-fiber nonwovens without a sustaining cycle. Blend of PET and PEN (Blener) is produced by mixing the PET chip and PEN chip after weighing. The copolymer of PET and PEN used as a super ingredient is dimethyl terephthalate, ethylene glycol, and dimethyl-2, 6-naphthalenedicarboxylate. When the exchange reaction is complete, the catalyst is added to prepare.

In the present invention, the PET and PEN copolymer used as a super ingredient during composite spinning is preferably composed of 80 to 99 mol% PET and 1 to 20 mol% PEN, and the mixture of PET and PEN is PET 80 ~. It is preferably composed of 99% by weight and 1 to 20% by weight of PEN. If PEN exceeds 20 mol% or 20 wt%, it is uneconomical because the compatibility with PET is not uniform and the physical properties are lowered and PEN is expensive. In addition, when the PEN is less than 1 mol% or 1 weight%, the weather resistance of the thermoplastic synthetic fiber nonwoven fabric does not improve to a desirable level.

In the present invention, the single yarn fineness (the fineness of the monofilament) of the heart sheath multifilament after stretching is maintained at a level of 0.5 to 20 denier. If the single yarn fineness is too thin, there is more cutting in the stretch ejector, which may lower the fairness and reduce the strength of the final product. On the other hand, if the single yarn fineness is too thick, the cooling unevenness of the yarn occurs in the spinning process, resulting in uneven physical properties of the product.

Next, as described above, the cardiac multifilament prepared by complex spinning a copolymer or mixture of the core component PET and the supercomponent PET and PEN is stretched with high pressure air in an air ejector, A web is fabricated by uniformly dispersing and integrating the elongated heart sheath multifilament onto a moving porous conveyor. The carding machine may be a corona discharge method using static electricity. It is preferable to adjust extending | stretching conditions so that single yarn fineness after extending | stretching may be 0.5-20 denier after extending | stretching.

On the other hand, after cutting the thermoplastic multifilament produced by melt spinning to produce a staple (Staple), it is also possible to produce a web by dispersing, aggregated on a conveyor to move the staple (Staple).

Next, in order to give strength to the manufactured web, the entanglement is provided by the hot pressing method, the needle punch method, and / or the resin bonding method. Generally, when the unit weight of the nonwoven fabric is 100 g / m 2 or less, the hot pressing method is mainly used, and in the case of 100 g / m 2 or more, the needle punch method is mainly used. The resin bonding method is used as an auxiliary means for reinforcing the strength of the nonwoven fabric produced by these methods.

In this way, the web given the entanglement (Web) is wound up to produce the thermoplastic synthetic fiber nonwoven fabric of the present invention.

Since the thermoplastic synthetic fiber nonwoven fabric of the present invention is made of a sheath type multifilament or a short fiber thereof, which is made of a resin obtained by copolymerizing or branding PEN having a high secondary glass transition temperature (Tg) with PET, various conventional additives are used. It has excellent weather resistance without any weathering effects and is also semi-permanent.

In addition, since various conventional additives are not used, workability and operability deterioration due to smoke generation during the spinning process can be prevented, manufacturing cost is low, and the manufacturing process is simple.

The thermoplastic synthetic fiber nonwoven fabric of the present invention has a weather resistance (tensile strength retention) of 70% or more as measured by the following evaluation method.

In the present invention, the evaluation method of weather resistance, workability and tensile strength of the thermoplastic synthetic fiber nonwoven fabric is as follows.

Weather resistance (tensile strength retention)

According to JIS L-1096 6.30 Weather Resistance Measurement Method (Japan), a predetermined tester is used according to JIS B 7752 [Ultraviolet carbon arc lamp weather resistance tester] or JIS B 7753 [Sunlight carbon arc lamp weather resistance tester]. After exposure for a period of time, the specimen is removed, dried naturally, and the tensile strength of the specimen moistened to a standard condition is measured with an Instron. In addition, after measuring the tensile strength of the test piece before the aging treatment by Instron, weather resistance is calculated by the following equation.

· Operability evaluation

In spunbond method, smoke occurrence was observed under 24-hour operation (yield) and spinning detention, and the presence of smoke was investigated.

Tensile strength

According to JIS L-1096 method (Japan) / KS K 0520 (Korea), the maximum tensile strength is measured at a tensile speed of 300 m / min using a specimen having a width of 50 mm and a length of 100 mm.

Hereinafter, the present invention will be described in detail with reference to Examples and Comparative Examples. However, the present invention is not limited only to the examples.

Example 1

1 mol% of dimethyl-2,6-naphthalene dicarboxylate (hereinafter referred to as 2, 6-NDC), 99 mol% of dimethyl terephthalate (hereinafter referred to as DMT) and an excess of ethylene glycol were added to the polymerization reactor and reacted. The copolymer of PET and PEN is used as a super ingredient, and polyethylene terephthalate (PET) having an intrinsic viscosity (W) of 0.65 is used as a core component. To prepare a deep sheath multifilament. After the cardiac multifilament is opened with a corona discharge carding machine, the web is randomly dispersed on a net conveyor to form a web. The web is then thermally compressed with a roller at 200 ° C to have a unit weight of 80 g / m 2. A phosphor synthetic thermoplastic nonwoven fabric is prepared.

Example 2-Example 5

A thermoplastic synthetic fiber nonwoven fabric was manufactured under the same conditions and processes as in Example 1 except that the copolymer molar ratio and single yarn fineness of 2, 6-NDC and DMT were changed as shown in Table 1.

Example 6

A mixture of PET and PEN prepared by mixing 1% by weight of PEN chip and 99% by weight of PET chip is used as a super ingredient, and polyethylene terephthalate (PET) having an intrinsic viscosity (IV) of 0.65 is used as a core component. After the composites are spun together, they are stretched in an air eject to produce thermoplastic multifilaments having a single yarn fineness of 20 deniers. The thermoplastic multifilament is opened with a corona discharge type carding machine, and then randomly dispersed on a net conveyor to form a web. Then, the manufactured web is thermally compressed with a 200 ° C. roller to have a unit weight of 80 g / mm 2. A thermoplastic synthetic fiber nonwoven fabric is produced.

Example 7-Example 9

A thermoplastic synthetic fiber nonwoven fabric was manufactured under the same conditions and processes as in Example 6 except that the mixed weight ratio and single yarn fineness of the PET chip and the PEN chip were changed as shown in Table 1.

Comparative Example 1

Polyethylene terephthalate (PET) with an intrinsic viscosity of 0.65 is used as a core component, and high density polyethylene (HDPE) is used as a supercomponent, and these are spun together and drawn in an ejector to prepare a deep herbaceous multifilament having 20 denier single yarn fineness. do. After manufacturing the cardiac-type multifilament with a corona discharge type carding machine, randomly disperse on a net conveyor to form a web, and then heat-press the manufactured web with a roller at 200 ° C to have a unit weight of 80 g. A thermoplastic synthetic fiber nonwoven fabric is produced, which is / m < 2 >.

Comparative Example 2

Polyethylene terephthalate having an intrinsic viscosity of 0.65 is used as a core component and a supercomponent, and then composite spinning is performed on an ejector to prepare a deep-fiber multifilament having a single yarn fineness of 15 deniers. After manufacturing the cardiac type multifilament with a corona discharge type carding machine, randomly disperse on a net conveyor to form a web, and then heat-press the manufactured web with a roller at 200 ° C. to obtain a unit weight of 80 g. A thermoplastic synthetic fiber nonwoven fabric is produced, which is / m < 2 >.

TABLE 1 Manufacturing Conditions

* Antioxidant gel benzophenol based from Shiba GIGI.

Table 2 shows the results of evaluating the operability and weatherability of the thermoplastic-containing fiber nonwoven fabric prepared in Examples and Comparative Examples by the above-described evaluation method.

<Table 2> Property Evaluation Results

Since the thermoplastic synthetic fiber nonwoven fabric of the present invention is made of a core sheath multifilament containing a resin obtained by copolymerizing or mixing PEN having a relatively high secondary glass transition temperature (Tg) with PET, it has excellent weather resistance of 70% or more. Water resistance is maintained semipermanently.

In addition, the present invention does not use various additives such as UV stabilizer, oxidation control agent and heat-resistant agent to improve weather resistance when manufacturing the thermoplastic synthetic fiber nonwoven fabric, it is possible to prevent the deterioration of workability and operability due to smoke during the spinning process, The manufacturing cost is low and the process is simplified.

Claims (2)

To manufacture thermoplastic synthetic fiber nonwoven fabric through the process of manufacturing thermoplastic multifilament by melt spinning thermoplastic resin, webizing process of randomly dispersing the prepared thermoplastic multifilament and integrating onto porous conveyor, and entanglement process to impede web. In the thermoplastic multifilament, a copolymer or polyethylene terephthalate of polyethylene terephthalate (PET) 80 to 99 mol% of polyethylene terephthalate (PET) and 1 to 20 mol% of polyethylene naphthalate (PEN) as a core component (PET) Thermo-synthetic fiber with excellent weatherability, characterized by using a mixture of 80 to 99% by weight of polyethylene naphthalate (PEN) and 1 to 20% by weight of blend (Blender) as the core component of the core sheath multifilament. Method for manufacturing nonwovens. The fiber constituting the nonwoven fabric is a polyethylene terephthalate (PET) core component, the supercomponent is a copolymer or polyethylene terephthalate (80 to 99 mol% polyethylene terephthalate (PET) and 1 to 20 mol% polyethylene naphthalate (PET) ( PET) A sheath type multifilament or a staple thereof, which is a mixture of 80 to 99% by weight and 1 to 20% by weight of polyethylene naphthalate (PEN), and has weather resistance (tensile strength retention) of 70% or more. Thermoplastic synthetic fiber nonwoven fabric characterized in that.