KR102322603B1 - Fiber yarn for net and manufacturing method thereof - Google Patents

Abstract

A manufacturing method of fiber yarn for a net according to the present invention can manufacture fiber yarn for a net excellent in durability and strength by irradiating ultraviolet rays while spinning a melt containing polypropylene, carbon nanotubes, polyester, and an adhesive.

Description

FIBER YARN FOR NET AND MANUFACTURING METHOD THEREOF

The present invention relates to a fiber yarn for a net having excellent durability and strength, and a method for manufacturing the same.

Nets are used for various purposes in various fields such as construction sites, fishing, and agriculture. For example, in construction sites, safety nets are installed vertically and horizontally to prevent injuries from falling and falling objects of construction materials, workers, and in the agricultural field, they are used to help the direction of crop growth or prevent the fall of fruits. . As such, the uses used in each field are different, but they have in common that strong strength is required, such as supporting heavy objects or absorbing shocks.

Nylon nets, which are mainly used in the prior art, have the advantages of being light and inexpensive, but are vulnerable to heat, have poor durability, and tend not to provide the desired strength in each field. Accordingly, if the net is damaged during use, it may lead to a serious situation leading to personal injury depending on the circumstances.

Therefore, we would like to propose a fiber yarn for a net that is light, durable and has high strength.

One object of the present invention is to provide a method for manufacturing a fiber yarn for a net with improved durability and strength by irradiating ultraviolet rays while spinning a melt containing polypropylene, carbon nanotubes, polyester and adhesive will be.

Another object of the present invention is to provide a fiber yarn for a net excellent in durability and strength manufactured according to the above method, and a net including the fiber yarn for a net.

In order to solve the above problems, the present invention comprises the steps of: preparing a molten solution of polypropylene, carbon nanotubes, polyester and an adhesive; manufacturing a fiber yarn by irradiating ultraviolet rays while spinning the melt; cooling the spun yarn; heating the cooled yarn and coating it with a coating agent; and cooling and drying the coated fiber yarn.

The melt may include 70 to 85 parts by weight of polypropylene, 10 to 25 parts by weight of carbon nanotubes, 5 to 15 parts by weight of polyester, and 1 to 3 parts by weight of an adhesive.

The adhesive may be at least one of a phenol resin-based adhesive, an epoxy resin-based adhesive, a phenol-nitrile rubber-based adhesive, an epoxy-phenol-based adhesive, a vinyl acetate-based adhesive, and a urethane acrylate-based adhesive.

The coating agent may be any one or more selected from the group consisting of liquid silicone rubber, Teflon, acrylic resin, and urethane resin.

The ultraviolet rays have a wavelength of 250 to 400 nm, and may be irradiated with an irradiation amount in the range of ^{0.7 to 2.5 J/cm 2 .}

The radiation temperature may be 260 to 320 ℃.

The heating temperature of the cooled fiber yarn may be 140 to 230 ℃.

In addition, the present invention provides a fiber yarn for a net manufactured according to the above manufacturing method.

In addition, the present invention provides a net including the fiber yarn for the net.

The net may be a fall arrest net, a flower net, or a fishing net.

The manufacturing method of the fiber yarn for a net according to the present invention is a fiber yarn for a net having excellent durability and strength by irradiating a melt containing polypropylene, carbon nanotube, polyester and an adhesive while simultaneously irradiating an ultraviolet light, and the fiber yarn for a net It is possible to manufacture a net comprising a.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. Since the present invention can have various changes and can have various forms, specific embodiments are illustrated in the drawings and described in detail in the text. However, this is not intended to limit the present invention to the specific disclosed form, it should be understood to include all modifications, equivalents and substitutes included in the spirit and scope of the present invention.

The terminology used in the present application is only used to describe specific embodiments and is not intended to limit the present invention. The singular expression includes the plural expression unless the context clearly dictates otherwise. In the present application, terms such as “comprise” or “have” are intended to designate that a feature, step, operation, component, part, or combination thereof described in the specification is present, and includes one or more other features or steps. , it should be understood that it does not preclude the possibility of the existence or addition of , operation, components, parts, or combinations thereof.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Terms such as those defined in commonly used dictionaries should be interpreted as having a meaning consistent with the meaning in the context of the related art, and should not be interpreted in an ideal or excessively formal meaning unless explicitly defined in the present application. does not

The method for manufacturing a fiber yarn for a net of the present invention comprises the steps of: preparing a melt containing polypropylene, carbon nanotubes, polyester and an adhesive; manufacturing a fiber yarn by irradiating ultraviolet rays while spinning the melt; cooling the spun yarn; heating the cooled yarn and coating it with a coating agent; and cooling and drying the coated fiber yarn.

The melt may include 70 to 85 parts by weight of polypropylene, 10 to 25 parts by weight of carbon nanotubes, 5 to 15 parts by weight of polyester, and 1 to 3 parts by weight of an adhesive based on 100 parts by weight of the melt.

The polypropylene is a main component of the polypropylene fiber yarn, and has good formability and high hydrophobicity so that the fiber yarn has quick-drying properties. If the net absorbs moisture and does not dry well, the weight of the net increases, making it difficult to transport and has problems such as poor durability of the net itself. The polypropylene imparts a property to allow good drying when the net absorbs moisture.

The carbon nanotubes have light and strong strength, so that excellent strength can be imparted to the fiber yarn for a net of the present invention. The carbon nanotube may be a single-walled carbon nanotube, a multi-walled carbon nanotube, or the like, but is not limited thereto. The carbon nanotube may form a fiber yarn structure with the polypropylene and polyester so that the fiber yarn has strong strength.

The polyester increases the durability of the fiber yarn for the net, and maintains the same strength when the net is wet or dried. Due to the nature of the net, there are many environments that are used outdoors, so wet and dry conditions may be repeated. This is because, if the net becomes weak when wet, damage to property or life may occur. The polyester may be polyethylene terephthalate, polybutylene terephthalate, or a mixture thereof. If the polyester content is less than 5 parts by weight, the properties by the polyester are not significantly expressed, and if it exceeds 15 parts by weight, the flexibility of the fiber yarn may decrease and thus may not be suitable for manufacturing a net.

The adhesive is not particularly limited thereto, but may be any one or more selected from the group consisting of phenol resin-based, epoxy resin-based, phenol-nitrile rubber-based, epoxy-phenol-based, vinyl acetate-based, urethane acrylate-based and natural adhesives. The adhesive is specifically a urethane acrylate-based adhesive, more specifically a mixture of polyurethane acrylate and polyethylene glycol diacrylate, more specifically, a weight ratio of polyurethane acrylate and polyethylene glycol diacrylate 100: 10 to It may be a mixture of 100:1. The adhesive may serve to physically and chemically bond the polypropylene, carbon nanotubes, and polyester to each other in the spun polypropylene fiber yarn to maintain the strength of the fiber yarn. When the amount of the adhesive is less than 1 part by weight, adhesion of the components is not made well, so that the fibrous yarn may be easily broken, and when it exceeds 3 parts by weight, the surface may be rough.

The radiation temperature may be made in the range of 260 to 320 ℃. In addition, the spinning speed may be 300 to 4000 m/min.

The ultraviolet irradiation may be irradiated at a wavelength of 250 to 400 nm, preferably at a wavelength of 300 to 380 nm, more preferably at a wavelength of 370 nm. The irradiation amount of the ultraviolet light is 0.7 ~ 2.5 J / cm ² range. Specifically, it may be in the range of 1.0 to 2.0 J/cm ² , wherein, when the irradiation amount exceeds 2.5 J/cm ² , the fiber may be embrittled. The ultraviolet irradiation can improve the strength of the fiber yarn by forming a fiber yarn structure between the polypropylene, carbon nanotube, and polyester contained in the melt, thereby more densely connecting.

The fiber yarn may be spun and then subjected to a cooling step. The cooling temperature may be in the range of 15 to 25 °C. The cooling may be performed by cooling water or cooling air.

The cooled polypropylene fiber yarn may be heated again and coated with a coating agent. By the coating, water absorption is reduced, and flame retardancy and aging by sunlight can be reduced. The coating step is performed in a state in which the cooled fiber yarn is heated, and the coating agent may be densely coated on the polypropylene fiber yarn by the heating. The heating temperature is preferably 140 to 230 ℃, more preferably 180 to 220 ℃ may be.

The coating agent is not particularly limited thereto, but may be any one or more selected from the group consisting of liquid silicone rubber, Teflon, acrylic resin, and urethane resin. The coating agent may be used in an amount of 1 to 4 parts by weight based on 100 parts by weight of the fiber yarn. The coating agent may be mixed and coated with additives such as flame retardants, flame retardants, impact modifiers, antioxidants, antibacterial agents, dyes, and the like.

Thereafter, by drying the coated fiber yarn after cooling, it is possible to finally prepare a fiber yarn for a net.

Example

75 parts by weight of polypropylene, 15 parts by weight of carbon nanotubes, 7 parts by weight of polyethylene terephthalate (polyester), and 3 parts by weight of a 100:4 mixture of polyurethane acrylate and polyethylene glycol diacrylate in a mixed solvent, A melt was prepared by stirring while heating to mix well. The melt was put into a spinning machine and irradiated with ultraviolet rays (irradiation amount: 1.5 J/cm ² ) of a wavelength of 370 nm while radiating at 290° C. and 400 m/min to prepare a fiber yarn. The spun yarn was immediately cooled. The cooled yarn was heated to 220° C. and then immersed in a liquid silicone resin solution and coated. After that, it was cooled again and dried to prepare the fiber yarn for the net of Example.

Comparative Example 1

Add 75 parts by weight of polypropylene, 7 parts by weight of polyethylene terephthalate (polyester), and 3 parts by weight of a 100:4 mixture of polyurethane acrylate and polyethylene glycol diacrylate to a mixed solvent and stir while heating to mix the materials well. was prepared. The melt was placed in a spinning machine and irradiated with ultraviolet rays (irradiation amount: 1.5 J/cm ² ) of a wavelength of 370 nm while radiating at 290° C. and 400 m/min to prepare a fiber yarn. The spun yarn was immediately cooled. After heating the cooled fiber yarn to 220 ℃, it was coated by immersion in a liquid silicone resin solution. After that, it was cooled again and dried to prepare the fiber yarn for the net of Example.

Comparative Example 2

75 parts by weight of polypropylene, 15 parts by weight of carbon nanotubes, 7 parts by weight of polyethylene terephthalate (polyester) and 3 parts by weight of a 100:4 mixture of polyurethane acrylate and polyethylene glycol diacrylate in a mixed solvent, A molten solution was prepared by stirring while heating to mix. The melt was put into a spinning machine and spun at 290° C. at 400 m/min to prepare a fiber yarn. The spun yarn was immediately cooled. After heating the cooled fiber yarn to 220 ℃, it was coated by immersion in a liquid silicone resin solution. After that, it was cooled again and dried to prepare the fiber yarn for the net of Example.

Comparative Example 3

75 parts by weight of polypropylene, 15 parts by weight of carbon nanotubes, 2 parts by weight of polyethylene terephthalate (polyester) and 3 parts by weight of a 100:4 mixture of polyurethane acrylate and polyethylene glycol diacrylate in a mixed solvent, A molten solution was prepared by stirring while heating to mix. The melt was placed in a spinning machine and irradiated with ultraviolet rays (irradiation amount: 1.5 J/cm ² ) of a wavelength of 370 nm while radiating at 290° C. and 400 m/min to prepare a fiber yarn. The spun yarn was immediately cooled. After heating the cooled fiber yarn to 220 ℃, it was coated by immersion in a liquid silicone resin solution. After that, it was cooled again and dried to prepare the fiber yarn for the net of Example.

Comparative Example 4

75 parts by weight of polypropylene, 15 parts by weight of carbon nanotubes, 25 parts by weight of polyethylene terephthalate (polyester), and 3 parts by weight of a 100:4 mixture of polyurethane acrylate and polyethylene glycol diacrylate in a mixed solvent, A melt was prepared by stirring while heating to mix well. The melt was placed in a spinning machine and irradiated with ultraviolet (irradiation amount: 1.5 J/cm ² ) of a wavelength of 370 nm while radiating at 290° C. and 340 m/min to prepare a fiber yarn. The spun yarn was immediately cooled. The cooled yarn was heated to 160° C. and then immersed in a liquid silicone resin solution and coated. After that, it was cooled again and dried to prepare the fiber yarn for the net of Example.

Test Example 1

The strength of the fiber yarn for a net prepared according to the present invention was measured. Tensile strength of the net fiber yarns prepared according to the above Examples and Comparative Examples 1 and 2, respectively, was measured. Tensile strength was measured 10 times each with a universal testing machine, and the average value was recorded.

Uniqueness Tensile strength (g/d) Example - 15.0 Comparative Example 1 No UV irradiation in the manufacturing method of Examples 10.2 Comparative Example 2 Does not include carbon nanotubes in the embodiment 8.0

As can be seen from the experimental results, it can be seen that in the case of the Example according to the present invention, the strength is significantly increased as compared with Comparative Examples 1 and 2. In particular, it can be seen that there is a significant difference in strength compared to Comparative Example 1 which does not include carbon nanotubes. In addition, even if carbon nanotubes are included, it can be confirmed that the intensity is lowered when UV rays are not irradiated. From this, it can be seen that the strength of the fiber yarn is remarkably improved when it contains carbon nanotubes and is manufactured by irradiating ultraviolet rays during spinning.

Test Example 2

In the above example, by varying the polyester content of the melt, the tensile strength of the fiber yarns in wet and dry states was measured. Tensile strength was measured 10 times each with a universal testing machine, and the average value was recorded.

state polyester content Tensile strength (g/d) Example dry 7 parts by weight 15.0 wet 15.0 Comparative Example 3 dry 2 parts by weight 10.5 wet 8.6 Comparative Example 4 dry 25 parts by weight 15.0 wet 15.0

In the embodiment, it can be seen that the first fiber yarn has excellent tensile strength regardless of the state. In Comparative Example 3, the polyester content is small, so the tensile strength is also reduced, and it can be seen that it further decreases in a wet state. In addition, in Comparative Example 4, as the content of the polyester was greatly increased, the tensile strength was also increased, but it was confirmed that the increase was not conspicuous when compared with the content of the polyester of the Example.

Although the above has been described with reference to the preferred embodiments of the present invention, those skilled in the art can variously modify and change the present invention without departing from the spirit and scope of the present invention as set forth in the following claims. You will understand that you can.

Claims (8)

70 to 85 parts by weight of polypropylene, 10 to 25 parts by weight of carbon nanotubes, 5 to 15 parts by weight of polyethylene terephthalate, and 1 to 3 parts by weight of a mixture of polyurethane acrylate and polyethylene glycol diacrylate to prepare a melt step;
preparing a fiber yarn by irradiating the molten solution with ultraviolet rays while spinning at a temperature of 260 to 320°C;
Cooling the spun yarn at a temperature of 15 to 25 ℃;
heating the cooled fiber yarn at a temperature of 140 to 230° C. and coating it with a liquid silicone rubber; and
Including; cooling and drying the coated fiber yarn;
The method for producing a fiber yarn for a net, that the manufactured fiber yarn for a net has the same strength in a wet state and in a dry state. delete delete delete According to claim 1,
The ultraviolet is a wavelength of 250 ~ 400nm, characterized in that irradiated with an irradiation amount in the range of ^{0.7 ~ 2.5 J / cm 2,}
A method for manufacturing a fiber yarn for a net. delete delete The fiber yarn for a net manufactured by the manufacturing method of Claim 1 or 5.