KR101152492B1 - Super heat resisting composition fiber yarn and a using composition adiabatic fiber thereby - Google Patents

Abstract

PURPOSE: An ultra thermal resistant composite fiber yarn and a composite fabric using the same are provided to prevent thermal shrinkage or relaxation by direct and indirect heat and to ensure excellent physical property. CONSTITUTION: An ultra thermal resistant composite contains 50-80 wt% of carbon fiber and 20-50 wt% of aramide fiber or 50-90 wt% of carbon fiber, 8-30 wt% of aramide fiber, and 2-20 wt% of metal fiber. A composite fabric using ultra thermal resistant composite is fabricated in a form of safety glove, bandana, and socks.

Description

Super heat resisting composition fiber yarn and a using composition adiabatic fiber

The present invention relates to a super heat-resistant composite fiber yarn and a composite fabric using the same, more specifically, flame retardancy, heat resistance and flame retardancy, physical properties, shape stability and durability according to temperature change, antistatic and electromagnetic shielding It relates to a super heat-resistant composite fiber yarn and a composite fabric using the same at the same time.

As the economy develops recently, the scale of fire is also increasing, and as a result, the risks of human and property damages increase rapidly, raising concerns about the risk of fire, and many opinions have been proposed to strengthen related laws. To reduce the scale of such fires, development of materials that are not at risk of fire (such as clothing, interior linings, internal products such as automobiles and airplanes), and the establishment of regulations that use these materials and the strict application of them are essential. .

Accordingly, in recent years, flame retardant fibers have received much attention in terms of protecting lives from fire. The market structure of these flame retardant fibers is changing from the structure of the existing home textiles, transportation, and interior materials of public buildings to the mainstream, to the general structure such as infants. In the past, flame retardancy in special fields has now expanded to general textile products due to the spread of fire awareness. In addition, the trend is increasing due to the strict application of flame-retardant laws.

As the flame retardant method of the fiber has been largely developed flame retardant of the fiber product and the yarn manufacturing process, the flame retardant of the natural fiber is mainly used for the flame retardant processing of the fiber product and the flame retardant in the yarn manufacturing process Softening is mainly used synthetic fibers. In particular, the flame retardant processing of natural materials such as cotton is impossible to develop flame retardant fibers (yarn), so that the flame retardant to the material itself is impossible unless a method such as genetic manipulation is used. At present, a technique of imparting a certain degree of flame retardancy has been developed, and as a technique, a flame retardant method of natural fiber is actually used, but a disadvantage of causing environmental problems such as deterioration of durability by washing, discharge of harmful substances in processing, etc. have. In the case of polyester, which is the largest amount of synthetic fiber, the flame retardancy of the fiber product is difficult and the flame retardancy of the fiber itself is made in terms of durability.

In addition, the materials and fibers that are developed as the material of the fiber having its own flame retardancy are now available as many products. Typical examples include KEVLAR and NOMEX, which are all aromatic polyamides and polyimides, but these products are so expensive that they are used only for special purposes. In addition, polyvinyl chloride (Poly Vinyl Chloride) and Modacryl (Modified Polyacrylo-nitrile), which are flame retardant polymers, have been sold due to fiberization, but all of them are restricted in use due to environmental problems (eg, dioxin generation during combustion). have. In other words, many flame retardants are prohibited from use in environmental regulations, so it is important to select an appropriate flame retardant and to produce flame retardant fibers without deterioration of yarn properties using them.

Therefore, the optimal material in the field of safe clothing or industrial materials as a flame retardant that has excellent fire resistance to high heat and flames and blocks heat and flames without burning by developing a flame retardant fiber is one of the manufacturing fields of new technology. There are still technical difficulties.

Prior art related to this is "Compound Fiber Using Composite Insulation Fiber Yarn and Manufacturing Method Thereof" of Korean Patent Publication No. 10-0575473, "Compound Heat Insulation Fiber Yarn and Method of Manufacturing Method" of Korean Patent Publication No. 10-0575474. Etc. are known.

Such a prior patent describes a composite heat-insulating fiber and a composite heat-insulating fiber yarn having good heat resistance by mixing aramid fiber having good tensile strength and elongation with carbon fiber having good heat resistance, but this is somewhat heat-resistant but at a high temperature of 1000 ° C. or higher. After 3 to 5 minutes, the fiber is completely decomposed and its shape is lost, so it is difficult to maintain the insulation and flame retardant effect.

Korean Patent Publication No. 10-0575473 "Composite fiber and its manufacturing method using composite insulating fiber yarn" Korean Patent Publication No. 10-0575474 "Composite insulating fiber yarn and its manufacturing method" Korean Patent Publication No. 10-0837764 "Heat-resistant insulating composite fiber yarn and its manufacturing method" Korean Registered Patent Publication No. 10-0839124 "Composite Fiber Using Heat-Resistant Insulating Composite Fiber Yarn and Method for Manufacturing the Same"

An object of the present invention for fundamentally improving the conventional problems as described above, the flame retardancy, heat resistance and flame retardancy is excellent, there is little deformation by high heat or flame as well as there is little shrinkage and relaxation by direct and indirect heat It is excellent in physical properties, shape stability and durability, and provides an ultra-heat-resistant composite fiber yarn which simultaneously exhibits antistatic and electromagnetic shielding functions and a composite fabric using the same.

According to one aspect of the present invention for achieving the above object, one selected from carbon fiber and para-aramid or meta-aramid using polyacrylonitrile (PAN: Polyacrylonitrile) fiber 2 or more of the selected aramid fibers and metal fibers using stainless steel fibers to select any one of the number of 20s / 1, 20s / 2, 30s / 1, 30s / 2 composite fiber yarn To produce, but the composite fiber yarn is mixed in the ratio of 50 to 80wt% carbon fiber, 20 to 50wt% aramid fiber, or 50 to 90wt% carbon fiber, 8 to 30wt% aramid fiber, 2 to 20wt% metal fiber It is characterized by selecting any one of mixing.

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According to another aspect of the present invention, by using the composite fiber yarn as a warp and weft yarn, weaving the composite fabric by selecting any one of the plain weave, twill weave, main runner at a density of 40 / inch ~ 90 bone / inch Or welded clothing, work clothes, protective clothing, antistatic clothing, fire fighting clothing worn in the factory handling ammunition, or protective equipment, protective gloves, hoods, socks, characterized in that the production.

In this case, according to the present invention, the composite fabric is characterized by coating by selecting any one of PU coating, silicone coating, flame-retardant PU coating, flame-retardant silicone coating to maintain wear resistance and activity, breathable waterproof.

On the other hand, the terms or words used in the present specification and claims are not to be construed as limiting the ordinary or dictionary meanings, the inventors should use the concept of the term in order to explain the invention in the best way. It should be interpreted as meanings and concepts corresponding to the technical idea of the present invention based on the principle that it can be properly defined. Therefore, the embodiments described in the present specification and the configuration shown in the drawings are only the most preferred embodiments of the present invention, and do not represent all of the technical ideas of the present invention, and various alternatives may be substituted at the time of the present application. It should be understood that there may be equivalents and variations.

As described in the above configuration and operation, the super-heat-resistant composite fiber yarn and the composite fabric according to the present invention is excellent in flame retardancy, heat resistance and flame retardant, hardly deformed by high heat or flame, as well as shrinkage by direct and indirect heat. There is almost no relaxation, so the physical properties, form stability and durability are excellent, and it provides the effect of simultaneously exhibiting antistatic and electromagnetic shielding functions.

Hereinafter, preferred embodiments of the present invention will be described in detail.

The present invention relates to a super-heat-resistant composite fiber yarn excellent in flame retardancy, heat resistance and flame retardancy with little deformation by high heat or flame and a composite fabric using the same. In general, the conventional composite heat insulating fiber and composite heat insulating fiber yarn has some heat resistance, but after 3 to 5 minutes at a high temperature, the fiber is completely decomposed and its shape is lost, so it is difficult to maintain the heat insulating and flame retardant effect.

Accordingly, the present invention is to mix and select two or more kinds of carbon fiber, aramid fiber and metal fiber to make a composite fiber yarn with a single yarn and then use it to complete the composite fabric.

That is, according to one aspect of the present invention, by using a mixture of two or more selected from carbon fibers, aramid fibers and metal fibers to produce a composite fiber yarn in one yarn. In this case, carbon fibers are classified into polyacrylonitrile (PAN), rayon, and pitch based on the kind of precursor fibers used as raw materials, and mainly polyacrylonitrile (PAN) is used. In some cases, a rayon system, a pitch system, or the like may be used. The aramid fibers are selected from either para-aramid or meta-aramid, and the metal fibers are mainly stainless steel fibers, and among them, SUS316L fibers are mainly used. In some cases, SUS316 or SUS304 may be used.

In this case, according to the present invention, when the composite fiber yarn is used in a mixed selection of two kinds, carbon fiber is used in a mixture of 50 to 80wt%, aramid fiber in a ratio of 20 to 50wt%, and the composite fiber yarn is selected and mixed into three species. If used, carbon fiber is 50 ~ 90wt%, aramid fiber 8 ~ 30wt%, metal fiber is used to mix in the ratio of 2 ~ 20wt%. In other words, if the ratio is too high, the heat resistance and strength are excellent, and the antistatic performance is excellent, but the unit price is very high. The composite fiber yarn is produced by increasing the proportion of carbide fibers having heat resistance to compensate for this. Therefore, it is important to weave in a suitable ratio in consideration of the intended use and economical and flame retardant, heat resistance, flame retardant, the optimum mixing ratio in consideration of this will be described in detail in the following examples.

As such, the composite fiber yarn is selected from various raw materials for producing yarns, that is, carbon fiber, aramid fiber and metal fiber, and is finished in one thread. It produces a composite fiber yarn, and weaves the fabric using the composite fiber yarn. That is, aramid fibers having good strength and elongation but weak heat resistance, carbon fibers having excellent heat resistance, and metal fibers having excellent strength, chemical resistance, and conductivity were spun together to create composite fiber yarns. Therefore, each of them produces a composite fiber yarn that can make use of its advantages as a raw material and make up for its shortcomings.

And the composite fiber yarn according to the present invention is produced by selecting any one of the number of 20s / 1, 20s / 2, 30s / 1, 30s / 2. Even if the composite fiber yarn with the optimum mixing ratio is produced, many variables remain to obtain a successful final product. There is a big difference in flame retardancy, heat resistance, flame retardancy, heat durability, and heat insulation according to the small number of twists, thicknesses, and fiber content ratios of the yarns. Therefore, it is important to develop the composite fiber yarn for each particular mixing ratio and number of times, and the optimum mixing ratio in consideration of this will be described in detail in the following examples.

The composite fiber yarn is produced through a blending process, a carding process, a softening process, a spinning process, and a spinning process. In other words, the raw material carbon fiber, aramid fiber, metal fiber must go through the ① process to remove debris or miscellaneous material contained in the basic raw material through the blending process. During this process, it is necessary to introduce a beater and a proper cylinder to prevent fiber damage. In addition, ② remove the miscellaneous substances other than fibers through the carding process, and separate the pieces of cotton in small pieces one by one to make them evenly parallel to make slivers. It pulls several strands of slivers into a single sliver and goes through the ③ softening process. In this process, a technique for analyzing and setting the optimal conditions of fiber parallelism is required. It can spin at various ratios of raw materials through ④ spinning process to make yarn of desired thickness through ④ spinning process to set optimum twist condition, quantification and rotation of roving.

As such, the multi-fiber composite fiber has a lot of blemish on the thread itself, and it looks messy in appearance and causes a lot of dust or powder to pollute the working environment when weaving the fabric. In order to compensate for this, using a heating and gas treating machine, it can look elegant and it is easy to weave and coat. In addition, even the small processing does not damage the yarn at all. As weaving fabrics using this, other advantages such as ease of weaving and ease of coating can be expected.

According to another aspect of the present invention, by using the composite fiber yarn as a warp and weft yarn, weaving the composite fabric by selecting any one of the plain weave, twill weave, main runner at a density of 40 / inch ~ 90 bone / inch Welds, work clothes, protective clothing, anti-static clothing, fire fighting clothing, or protective gear, protective gloves, hoods, socks, etc., worn at factories handling ammunition or ammunition. As described above, the composite fabric is woven at an appropriate ratio in consideration of the use of the composite fabric and economical and flame retardant properties, heat resistance, and flame resistance.

The composite fiber yarn, that is, carbon fibers and aramid fibers and metal fibers by using two or more selected by mixing to produce a single yarn, using this to complete a composite fabric. This is made of a woven fabric (fabric) by using a composite fiber yarn as a warp and weft yarn. In weaving, weaving composite fabric by selecting one among plain weave, twill weave and runner weave, but various change weaving methods such as 2will, mat, Panama can be applied and strength and productivity are important choices. Of course, the woven fabric must also meet the requirements of water permeability, UV blocking rate.

In this way, the composite fiber yarn is used as a warp and weft yarn to select any one of plain weave, twill, and runners to weave a composite fabric, which is usually a weaving composite fabric (fabric) with a weaving fiber machine. Plain weave) is the simplest organization where the warp and weft intersect alternately one by one, then go up and then go down. In plain weave, the strength of the material is determined by the thickness of the yarn and the density of the weave. Twill weave, also known as serpentine, is a twisting or weft thread with two or more threads that continue to rise, followed by a downward weave, with diagonal lines connecting these tissue points. In twill weave, there is less tissue point than plain weave, and it is flexible and can have a high density, resulting in a thick and soft fabric. Therefore, it is widely used after plain weave, including suits. In addition, satin weave is a tissue in which the tissue points of the fabric are made to show the warp or weft only by dispersing the tissue points without connecting them with as few as possible.

At this time, even if weaving a composite fabric, many variables remain until a successful final product is obtained. Even when weaving with the same weaving structure according to the number of twists, thicknesses, and metal content ratios of the yarns, the surface condition, surface roughness, heat durability, and heat insulating properties are greatly different. In addition, if the constant tension is not maintained, the surface roughness becomes uneven, and the trimming phenomenon occurs, leading to product defects. Especially, the constant tension control, the weaving speed control and the density control are important. This will be explained in detail.

The woven composite fibers can be used as a variety of applications, such as welding clothes, work clothes, protective clothing, antistatic clothing, fire fighting clothing worn in factories handling chemicals or ammunition, protective equipment, protective gloves, We can create products considering economics, flame retardancy, heat resistance, and flame resistance in various fields such as hoods and socks.

At this time, the composite fabric according to the present invention is selected by coating any one of PU coating, silicone coating, flame retardant PU coating, flame retardant silicone coating to maintain wear resistance and activity, moisture permeability. Such a composite fabric is usually subjected to a process of coating one side of the composite fabric to maintain wear resistance, activity, moisture permeability on a coating textile machine. The coating is a process of coating one side of the composite fabric with PU coating, silicone coating, flame retardant PU coating, flame retardant silicone coating and the like. Coated composite fabrics have increased strength and improved water resistance, airtightness, and moisture resistance. For fabrics that require good breathability and light transmission, it is better to reduce the coating of the coating or omit the coating at all. Coating both sides of a composite fabric makes it difficult to use as a fabric and is therefore not considered for any particular use.

That is, the coating is carried out to improve the durability and performance of the composite fabric of the present invention, which uses a coated fabric to compensate for the problems caused during sewing when manufacturing work clothes and protective equipment requiring heat resistance, The blood of the fabric may be subjected to a thin moisture-permeable, water-repellent coating to prevent development and breakup. In addition, since the coating may affect the fabric itself, the organic coating or inorganic coating having flame retardancy may be performed or the thickness of the coating may be appropriately adjusted according to the use to compensate for this point.

As such, the composite fiber yarn and the composite fabric using the same will look more specifically at the present invention to verify the optimum mixing ratio. However, the protection scope of the present invention is not limited by the embodiments.

[Examples 1 to 3 relating to yarn]

Example 1 of the present invention was mixed by spinning in a ratio of 50 ~ 80wt% carbon fiber having excellent heat resistance and 20 ~ 50wt% of para-aramid fiber (P-aramid) to make a yarn (composite fiber yarn), Example 2 50 ~ 90wt% of carbon fiber and 8 ~ 30wt% of para-aramid fiber and 2 ~ 20wt% of metal fiber were mixed and spun to make anti-static and excellent strength. Example 3 is spun by mixing 80% by weight of para-aramid fibers (P-aramid) and 20% by weight of meta-aramid fibers (M-aramid) to form a yarn (composite fiber yarn).

This is based on the blended basic technology, and the composite fiber yarn (spun yarn) is optimized for Break Draft, Tension Draft and Twist conditions during the spinning process. (Spun Yarn) can be produced.

[Example 1 of Fabric]

In Example 1 of the present invention, when weaving a composite fabric, the yarn is inclined at 100 wt% of para-aramid fiber (P-aramid), and the weft yarn is 50 to 80 wt% of carbon fiber having excellent heat resistance and para-aramid fiber (P- aramid) Weave using composite fiber yarn (spun yarn) mixed at 20 ~ 50wt%. In this case, single fiber (20s / 1, 30s / 1) is used among 20s / 1, 20s / 2, 30s / 1 and 30s / 2, and the density is 40 / inch to 90 / Inch can be woven according to the usage. As the density increases, the fabric becomes denser, the strength increases, and the advantages of yarn can be exposed more. On the other hand, if the use is used as welding clothes, work clothes, protective clothes, antistatic clothing, fire fighting clothes, etc., it is best to select a suitable density and weave because it requires a feeling of fit and activity.

That is, when weaving the woven fabric according to the first embodiment of the present invention, the ratio of carbon fibers is not relatively high as only aramid fibers are used for warp. Therefore, the heat resistance is not very good, but after heat treatment at about 400 ℃ for 1 hour after the appearance evaluation it can be confirmed that there is only no discoloration but other damage. In addition, since the content of the aramid fibers is relatively high, the tensile strength, tear strength, tensile elongation, etc., which are characteristic of the aramid fibers, are excellent.

This is characterized by the result of more than 4000g / ㎡hour in the case of moisture permeability of the composite fabric. Here, the moisture permeability refers to the weight of the submersible which passes through 1 square meter of fabric for 1 hour under the specified temperature and humidity. It refers to the degree to which heat and sweat generated by the body are discharged when the garment which is treated to be permeable is worn. The higher the value, the better the moisture permeability. Therefore, workers exposed to extreme environments handling or handling heat or other chemicals must wear functional coveralls or protective clothing that can protect them from hazardous materials, while existing fabrics for protective or workwear, protective equipment, etc. It was thick or stiff, and was inferior in fit and breathability. However, if the protective clothing or equipment is made using the fabric with excellent moisture permeability, the worker can work in a more pleasant environment and is also easy in terms of activity.

[Example 2 of Fabric]

[직물에 관한 실시예3]In Example 2 of the present invention, when weaving a composite fabric, the warp yarn is used in the same manner as in Example 1 (the yarn is inclined at 100 wt% of para-aramid fiber (P-aramid)), and the weft yarn is used for strength, heat resistance, and antistatic. For weaving using a composite fiber yarn (spun yarn) mixed in a ratio of 50 ~ 90wt% carbon fiber, 8 ~ 30wt% aramid fiber and 2 ~ 20wt% metal fiber. As in Example 1, single yarn (20s / 1, 30s / 1) was used among 20s / 1, 20s / 2, 30s / 1, and 30s / 2 of warp and weft yarns, and the density was 40 / inch to 90 / inch. Select and weave according to the intended use. This composite fabric is different from Example 1 by using three types of composite fiber yarn (spun yarn) containing a metal fiber. The composite fabric is characterized by having an excellent antistatic effect and an electromagnetic shielding function when the tribostatic voltage is measured, resulting in a value of 500 V or less, which is an antistatic section.

[Example 3 of Fabric]

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In Example 3 of the present invention, when weaving a composite fabric, the weft yarns of the two types of composite fibers (50 to 80wt% of carbon fiber and 20 to 50wt% of para-aramid fiber) used in Example 1 In the case of the composite fiber yarn (spun yarn), 20s / 2 or 30s / 2 is used among 20s / 1, 20s / 2, 30s / 1, and 30s / 2. The warp yarn is made of a composite fiber yarn mixed at a ratio of 50 to 80 wt% of carbon fibers and 20 to 50 wt% of aramid fibers, and is woven using 20s / 2 or 30s / 2. Weaving is selected from 90 sets / inch according to the usage. Of course, the weft yarn can also use a composite fiber yarn in which carbon fibers and aramid fibers having the same content are mixed.

This shows that the oxygen limit index is about 30 to 35 as the carbon fiber content is increased, compared with Examples 1 and 2, where the composite fabric is used as an aramid fiber, which has excellent heat resistance, flame retardancy, and flame resistance. have. That is, the composite fabric woven in Example 3 of the present invention has a high content of carbon fiber having excellent thermal properties, so that the composite fabric can be used as a protective suit in an environment exposed to high temperature due to enhanced heat resistance.
[Example 4 of Fabric]

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In Example 4 of the present invention, when weaving a composite fabric, the inclination of the same two kinds of composite fiber yarns as in Example 3, namely, 50 to 80 wt% of carbon fibers and 20 to 50 wt% of para-aramid fibers (P-aramid) The mixture is used in a ratio, and accordingly, 20s / 2 or 30s / 2 is used for the composite fiber yarn (spun yarn). Weft yarns use three types of composite fiber yarns, which are used in a mixture of 50 to 90 wt% of carbon fiber, 8 to 30 wt% of aramid fiber and 2 to 20 wt% of metal fiber. Select from 20s / 2, 30s / 1, 30s / 2 and use it. Of course, the density is selected from the 40-inch / 90 ~ 90-inch / inch depending on the use of the weaving.

This is because the composite fabric does not have a small content of carbon fiber, so the oxygen limit index is about 30 to 35, and it can be seen that it is excellent in heat resistance, flame retardancy, and flame resistance. In addition, as the metal fiber is added to the metal properties and fibrous properties of Example 4 of the present invention, the properties of the excellent heat resistance and cut resistance and when fabricated has a role of preventing electrical friction excellent friction can do. That is, although the metal fiber has excellent characteristics that can be used in an extreme environment, the unit cost may increase in proportion to the content of the metal fiber.

[Example 5 of Fabric]

In Example 5 of the present invention, when weaving a composite fabric, the warp or weft yarns use the same composite fiber yarns as in Example 5, but in the case of the weft yarns, the content of the metal fibers is increased to contain more excellent properties of the metal fibers. do. However, as the content of the metal fiber increases, the content of carbon fiber and aramid fiber decreases, so that the overall characteristics may change.

It is easy to use as a work clothes, antistatic clothing, etc., which is used for antistatic, since the composite fabric has excellent antistatic performance at a value of 500 V or less, which is an antistatic section when measuring a friction band voltage. In addition, the content of carbon fibers having excellent heat resistance is reduced, but metal fibers also do not significantly affect this property because heat resistance is required. Therefore, even when the heat treatment for 1 hour at high temperature can be confirmed that there is no abnormality. However, if the metal content is absolutely increased, the unit price increases very much, and if it is manufactured by welding clothes, protective clothes, work clothes, firefighting clothes, or the like, it may have an adverse effect on the activity.

As described above, the ultra-heat-resistant composite fiber yarn of the present invention and the composite fabric using the same have excellent flame retardancy, heat resistance, and flame resistance, and are hardly deformed by high heat or flame, and hardly shrink or relax by direct or indirect heat or flame. It has excellent form stability, and its physical properties are not changed even in the harsh environment of high temperature, so stability and durability are enhanced, and antistatic and electromagnetic shielding function are simultaneously performed.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit and scope of the invention as defined by the appended claims. Therefore, such modifications or variations will have to belong to the claims of the present invention.

Claims (6)

Among the carbon fiber using polyacrylonitrile (PAN) fiber and the metal fiber using aramid fiber and stainless steel fiber selected from either para-aramid or meta-aramid By using a mixture of more than one species to select any number of 20s / 1, 20s / 2, 30s / 1, 30s / 2 to produce a composite fiber yarn with a single yarn,
The composite fiber yarn is mixed in the ratio of 50 to 80wt% carbon fiber, 20 to 50wt% aramid fiber, or the mixture of 50 to 90wt% carbon fiber, 8 to 30wt% aramid fiber, 2 to 20wt% metal fiber Super heat-resistant composite fiber yarn characterized in that any one of the choices. delete delete delete The composite fiber yarn according to claim 1 is used as a warp and weft yarn to select one of plain weave, twill weave and runner weave at a density of 40 / inch to 90 / inch to weave the composite fabric to produce chemicals or ammunition. Composite fabric using super heat-resistant composite fiber yarn, characterized in that the production of welding, work clothes, protective clothing, anti-static clothing, fire fighting clothing worn in the factory handling, or to produce protective equipment, protective gloves, hoods, socks. The method of claim 5,
The composite fabric is a composite fabric using a super heat-resistant composite fiber yarn characterized in that the coating is selected from any one of PU coating, silicone coating, flame-retardant PU coating, flame-retardant silicone coating to maintain wear resistance and activity, breathable waterproof.