NL2025600B1

NL2025600B1 - High temperature resistant yarn, composite fabric and protective fabric

Info

Publication number: NL2025600B1
Application number: NL2025600A
Authority: NL
Inventors: Cao Lixia; Ding Zhijia; Qian Jun; Ding Jianmei
Original assignee: Changshu Baofeng Special Fiber Co Ltd
Priority date: 2019-08-05
Filing date: 2020-05-18
Publication date: 2020-11-18
Also published as: CN110396748B; CN110396748A; DE202020102589U1

Abstract

The present invention belongs to the field of textile technologies and provides a high temperature resistant yarn, a composite fabric and a protective fabric. The high temperature resistant yarn comprises a core yarn and a wrap yarn that wraps the outer surface of the core yarn. The core yarn comprises any one of a basalt filament, a polyimide filament, a poly-p-phenylene terephthamide filament and a poly aromatic oxadiazole filament. The wrap yarn is prepared by blending a fiber containing a first flame retardant fiber and a second flame retardant fiber. The first flame retardant fiber comprises a high temperature resistant and flame retardant fiber, and the second flame retardant fiber comprises a high strength and flame retardant fiber. The core yarn inside the high temperature resistant yarn is made of a high strength yarn, so that the strength of the high temperature resistant yarn can be improved and skeleton support can be added to the high temperature resistant yarn, thereby being favorable for spinning. The wrap yarn of the high temperature resistant yarn is made of a high temperature resistant and flame retardant yarn, so that the high temperature resistance and flame retardance of the high temperature resistant yarn can be improved. The high temperature resistant yarn prepared by fitting the core yarn and the wrap yarn has high strength, good spinnability, and good high-temperature resistance and flame retardance.

Description

Title: High temperature resistant yarn, composite fabric and protective fabric

FIELD OF THE INVENTION The present invention relates to the field of textile technologies, and in particular, to a high temperature resistant yarn, a composite fabric and a protective fabric.

BACKGROUND OF THE INVENTION When working in the fields of metallurgy and welding, etc., a staff member needs to wear a protective suit to guarantee the working safety and protect the skin from being burnt.

However, the existing protective suit is generally made of pure cotton, cowskin or pure preoxidized fiber. A pure cotton protective suit has a large gram weight, a heavy feeling and a short service life, i.e., one week on average. A cowskin protective suit has a high cost and poor comfortability, and it cannot be made into a complete clothing, hence it lacks overall protection on human body. Pure preoxidized fiber has low strength and is unfavorable for manufacturing, and a protective suit made of pure preoxidized fiber has a low strength.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a high temperature resistant yarn, a composite fabric and a protective fabric, for solving the problem of insufficient strength of the existing protective fabric, which are favorable for spinning and weaving.

The embodiments of the invention are implemented as follow.

In a first aspect of the invention, there exemplarily provides a high temperature resistant yarn, which comprises a core yarn and a wrap yarn that wraps the outer surface of the core yarn.

The core yarn comprises any one of a basalt filament, a polyimide filament, a poly-p-phenylene terephthamide filament and a poly aromatic oxadiazole filament.

The wrap yarn is prepared by blending a fiber containing a first flame retardant fiber and a second flame retardant fiber.

The first flame retardant fiber comprises one or more of a preoxidized fiber, a glass fiber, a carbon fiber or a polybenzimidazole fiber.

The second flame retardant fiber comprises one or more of a poly-p-phenylene terephthamide fiber, a poly aromatic oxadiazole fiber and a polyimide fiber.

In the above technical solution, the core yarn inside the high temperature resistant yarn is made of a high strength varn, so that the strength of the high temperature resistant yarn can be improved, and skeleton support can be added to the high temperature resistant yarn, which is favorable for spinning and weaving. The wrap yarn of the high temperature resistant yarn is made of a high temperature resistant and flame retardant yarn, so that the high temperature resistance and flame retardance of the high temperature resistant yarn can be improved. The high temperature resistant yarn prepared by fitting the core yarn and the wrap yarn has high strength and good high temperature resistance and flame retardance. As the strength of the high temperature resistant yarn is increased, the spinnability of the high temperature resistant yarn can be improved.

Basalt filament, polyimide filament, poly-p-phenylene terephthamide filament and poly aromatic oxadiazole filament have high strength and have high flame retardance and heat resistance. When they are employed as the core yarn for preparing the high temperature resistant yarn, the strength of the high temperature resistant yarn can be improved, and at the same time, a certain flame retardance and heat resistance can be provided.

Preoxidized fiber, glass fiber, carbon fiber or polybenzimidazole fiber are high temperature resistant and flame retardant fiber. When they are employed as the wrap yarn for preparing the high temperature resistant yarn, the flame retardance of the wrap yarn can be improved.

Poly-p-phenylene terephthamide fiber, poly aromatic oxadiazole fiber and polyimide fiber are high strength and flame retardant fibers. When they are employed as the wrap yarn for preparing the high temperature resistant yarn, the strength of the wrap yarn can be improved.

A wrap yarn with high strength and good flame retardance can be prepared by fitting the first flame retardant fiber and the second flame retardant fiber.

In conjunction with the first aspect, in a first possible example of the first aspect of the invention, the decomposition temperature of the above first flame retardant fiber is not lower than 600°C.

In the above example, the decomposition temperature of the first flame retardant fiber is not lower than 600°C, and the high temperature resistant yarn made of the first flame retardant fiber has good high temperature resistance.

In conjunction with the first aspect, in a second possible example of the first aspect of the invention, the limiting oxygen index of the first flame retardant fiber is not lower than 40%.

In the above example, the limiting oxygen index of the first flame retardant fiber is not lower than 40%, which indicates that the first flame retardant fiber has good flame retardance and belongs to flame-resisting materials, and therefore the high temperature resistant yarn made of the first flame retardant fiber has good flame retardance.

In conjunction with the first aspect, in a third possible example of the first aspect of the invention, the limiting oxygen index of the above second flame retardant fiber is not lower than 35%.

In the above example, the limiting oxygen index of the second flame retardant fiber is not lower than 35%, which indicates that the second flame retardant fiber has good flame retardance and belongs to flame-resisting materials, and therefore the high temperature resistant yarn made of the second flame retardant fiber.

In conjunction with the first aspect, in a fourth possible example of the first aspect of the invention, the mass fraction of the first flame retardant fiber in the above wrap yarn is 50~80%, and the mass fraction of the second flame retardant fiber is 20~50%.

In the above example, the wrap yarn made of the first flame retardant fiber and the second flame retardant fiber in the above blending ratio has good flame retardance and high strength.

In a second aspect of the invention, there exemplarily provides a composite fabric prepared by weaving the above high temperature resistant yarn.

In the above technical solution, the composite fabric prepared by weaving the above high temperature resistant yarn has high strength and good flame retardance, thus it can be widely applied to protective suit, etc.

In conjunction with the second aspect, in a first possible example of the second aspect of the invention, the above composite fabric is prepared by interweaving a warp yarn and a weft yarn, wherein the warp yarn and the weft yarn are both made of two high temperature resistant yarns.

In the above example, the warp yarn and the weft yarn are both made of two high temperature resistant yarns, so that the strength of the warp yarn and the weft yarn can be improved, and the strength of the composite fabric can be further improved.

In a third aspect of the invention, there exemplarily provides a protective fabric, which comprises the above composite fabric, a first aluminium film and second aluminium film, wherein the first aluminium film is provided between the composite fabric and the second aluminium film.

In the above technical solution, the above aluminium film compounded on the composite fabric can reflect the heat, and the durability of the aluminium film can be improved by combining two aluminium films.

In conjunction with the third aspect, in a first possible example of the third aspect of the invention, a polyethylene glycol terephthalate (PET) or polyurethane (PU) film is provided between the first aluminium film and the second aluminium film.

In the above example, by providing a polyethylene glycol terephthalate or polyurethane film between two aluminium films, the bending resistance and bond strength of the aluminium film can be improved.

BRIEF DESCRIPTION OF THE DRAWINGS In order to more clearly illustrate the technical solutions of the embodiments of the invention, the drawings needed in the description of the embodiments will be briefly introduced below. Apparently, the drawings in the description below only show some embodiments of the invention, and other drawings may also be obtained by one of ordinary skills in the art according to these drawings without creative work.

Fig. 1 is a structural representation of a protective fabric according to an embodiment of the invention.

List of the reference numerals in the drawing: 10: protective fabric 100: composite fabric 200: the first aluminium film 300: the second aluminium film 400: PET or PU film

DETAILED DESCRIPTION OF THE EMBODIMENTS The technical solutions of the invention will be described in detail below in conjunction with the embodiments. However, it will be understood by one skilled in the art that, the embodiments below are merely provided for illustrating the invention, rather 5 than being construed as limiting the scope of the invention. In the embodiments, when no specific condition is indicated, a normal condition or a condition suggested by the manufacture will be employed. When the manufacture of a reagent or an instrument is not indicated, it may be a conventional product that is commercially available.

A high temperature resistant yarn, a composite fabric and a protective fabric according to the embodiments of the invention will be specifically illustrated below.

The invention provides a high temperature resistant yarn, which comprises a core yarn and a wrap yarn that wraps the outer surface of the core yarn.

Basalt is a basic extrusive rock, which is a rock with a compact or frothy structure formed by cooling on the ground surface the magma erupted by a volcano and belongs to magmatic rock. The main components of basalt includes silicon dioxide, alumina, ferric oxide, calcium oxide, magnesium oxide and a small amount of potassium oxide and sodium oxide, wherein the content of silicon dioxide is the largest, which is in the range of 45%~50%, the sum of the contents of potassium oxide and sodium oxide is slightly higher than that of intrusive rock, and the contents of calcium oxide, ferric oxide and magnesium oxide are slightly lower than those of intrusive rock. The bulk density of basalt is 2.8-3.3g/cm3, and due to the compact structure, it has a very large compressive strength, which may reach 300MPa.

Basalt fiber belongs to inorganic fibers, whose temperature resistance may reach 650°C, the limiting oxygen index of which is greater than 68%, and no toxic gas is discharged therein. It has good heat insulating property and high strength, without fusing or dropping or thermal contraction.

Limiting oxygen index refers to the volume fraction concentration of oxygen that just supports the combustion of a polymer or an inorganic substance in a mixture of oxygen gas and nitrogen gas, and it is an index characterizing the burning behavior of a material. Limiting oxygen index may be determined via a candle test, in which a polymer rod is combusted downward under a certain condition for testing. It is generally regarded that the substance may be combusted in the air when the limiting oxygen index is 22%. The limiting oxygen index is represented by the numerical value of the volume percentage of oxygen.

Polyimide (PI) refers to a polymer having an imide ring (-CO-N-CO-) on the main chain, wherein polyimide is a special engineering material that has excellent mechanical property.

Polyimide fiber (PI fiber) has the features of high strength and high modulus, and at the same time, it has high temperature resistance, chemical resistance, radiation resistance and flame retardance. PI fiber has a limiting oxygen index greater than 35% and a low fuming ratio, and it belongs to self-extinguishing materials. Additionally, PI fiber further has a high thermal decomposition temperature, and omnidirectional polyimide fiber has a thermal decomposition temperature of about 500°C, and polyphthalimide synthesized from biphenyl dianhydride and p-phenylene diamine has a thermal decomposition temperature of 600°C.

Poly-p-phenylene terephthamide (PPA) is also referred to as aramid fiber 1414 or para-aramid fiber, which is an all para-polyaramide condensation-polymerized from p-phenylene diamine and paraphthaloyl chloride.

The fiber of aramid fiber 1414 has the advantages of high breaking strength, high modulus, high temperature resistance and good flame retardance, and the limiting oxygen index thereof is greater than 28%.

On the molecular backbone of poly aromatic oxadiazole (POD) fiber, benzene rings and oxadiazole five-membered rings are arranged alternately. POD fiber has excellent heat resistance, the thermal decomposition temperature thereof is up to 500°C; and at the same time, the limiting oxygen index of POD fiber is greater than 30%, and the breaking strength is high.

Basalt fiber, PI fiber, aramid fiber 1414 and POD fiber all have high heat resistance, high flame retardance and high strength. Therefore, the core yarn made of any one or more of a basalt filament, a PI filament, an aramid fiber 1414 filament and a POD filament has high heat resistance, high flame retardance and high strength.

It should be noted that, any one or more of the basalt filament, the PI filament, the aramid fiber1414 filament and the POD filament according to the invention, including the core yarn, may be only made of a basalt filament, a PI filament, an aramid fiber 1414 filament or a POD filament, or may be made of a basalt filament and a PI filament, or may be made of a PI filament and an aramid fiber 1414 filament, or may be made of an aramid fiber 1414 filament and a POD filament, or may be made of a PI filament and a PAD filament, or may be made of a PI fiber, an aramid fiber 1414 and a POD fiber, or may be made of a basalt fiber, a PI fiber and an aramid fiber 1414. The wrap yarn is prepared by blending a fiber containing a first flame retardant fiber and a second flame retardant fiber.

The first flame retardant fiber includes one or more of a preoxidized fiber, a glass fiber, a carbon fiber or a polybenzimidazole fiber.

The preoxidized fiber includes polyacrylonitrile preoxidated fiber, which is made of polyacrylonitrile fiber as raw material via high temperature thermal stabilization.

The preoxidized fiber has a limiting oxygen index no less than 40% and has high temperature resistance, with no modification in an environment of 700°C.

Glass fiber is an inorganic non-metallic material with excellent performance.

Glass fiber is made of seven raw materials, i.e., pyrophyllite, arenaceous quartz, limestone, dolomite, bechilite and szaibelyite, via high temperature melting, wire drawing, winding and weaving, etc.

It has good heat resistance, with no modification in an environment of 1000°C, and it has a limiting oxygen index no less than 35%. Carbon fiber is a high strength and high modulus fiber with a carbon content over 90%, which is prepared by carbonizing acrylon and viscose fiber at a high temperature.

It has high temperature resistance, with no modification in an environment of 1000°C, and it has a limiting oxygen index no less than 35%. Polybenzimidazole (PBI) is a rigid chain polymer of benzo five-membered heterocyclic ring containing two nitrogen atoms.

PBI fiber has high temperature resistance and flame retardance, with no modification in an environment of 700°C.

It does not combust in the air, and it combusts slowly in oxygen.

It has a limiting oxygen index no less than 50%. Preoxidized fiber, glass fiber, carbon fiber and PBI fiber all have high heat resistance and high flame retardance.

Therefore, the first flame retardant fiber made of any one or more of preoxidized fiber, glass fiber, carbon fiber and polybenzimidazole fiber has high heat resistance and high flame retardance.

It should be noted that, one or more of the preoxidized fiber, the glass fiber, the carbon fiber and the PBI fiber according to the invention, including the first flame retardant fiber, may be only made of preoxidized fiber, glass fiber, carbon fiber or PBI fiber, or may be made of preoxidized fiber and glass fiber, or may be made of glass fiber and carbon fiber, or may be made of carbon fiber and PBI fiber, or may be made of preoxidized fiber, glass fiber and carbon fiber, or may be made of glass fiber, carbon fiber and PBI fiber, or may be made of preoxidized fiber, carbon fiber and PBI fiber, or may be made of preoxidized fiber, glass fiber, carbon fiber and PBI fiber.

Optionally, the decomposition temperature of the first flame retardant fiber is not lower than 600°C. Decomposition temperature refers to a temperature at which the degradation of the molecular chain of a viscous flow-state polymer will be accelerated and become significant.

The second flame retardant fiber made of any one or more of aramid 1414 fiber, POD fiber and PI fiber has high heat resistance, high flame retardance and high strength.

Optionally, the limiting oxygen index of the second flame retardant fiber is not lower than 35%.

It should be noted that, any one or more of the aramid 1414 fiber, the POD fiber and the PI fiber according to the invention, including the second flame retardant fiber, may be made of aramid 1414 fiber, POD fiber or PI fiber, or may be made of aramid 1414 fiber and POD fiber, or may be made of POD fiber and PI fiber, or may be made of aramid 1414 fiber and PI fiber, or may be made of aramid 1414 fiber, POD fiber and PI fiber.

The wrap yarn prepared by blending the first flame retardant fiber having high heat resistance and high flame retardance and the second flame retardant fiber having high heat resistance, high flame retardance and high strength has high heat resistance, high flame retardance and high strength.

In comparison with the heat resistance and flame retardance of the second flame retardant fiber, the heat resistance and flame retardance of the first flame retardant fiber is higher, and the first flame retardant fiber is mainly used for improving the flame retardance and heat resistance of the wrap yarn. In comparison with the strength of the first flame retardant fiber, the strength of the second flame retardant fiber is higher, and the second flame retardant fiber is mainly used for improving the strength of the wrap yarn. At the same time, the heat resistance and the flame retardance of the second flame retardant fiber is good, and when blending the second flame retardant fiber and the first flame retardant fiber, the heat resistance and flame retardance thereof will not be greatly affected. Therefore, the wrap yarn prepared still has excellent flame retardance and heat resistance, as well as improved strength. The core yarn inside the high temperature resistant yarn is made of a high strength yarn, so that the strength of the high temperature resistant yarn can be improved and skeleton support can be added to the high temperature resistant yarn, thereby being favorable for spinning and weaving. The wrap yarn of the high temperature resistant yarn is made of a high temperature resistant and flame retardant yarn, so that the high temperature resistance and flame retardance of the high temperature resistant yam can be improved, and the high temperature resistant yarn prepared by fitting the core yarn and the wrap yarn has high strength and good high temperature resistance and flame retardance. After the strength of the high temperature resistant yarn is improved, the spinnability of the high temperature resistant yarn can be reinforced.

In comparison with the heat resistance and flame retardance of the inner core yarn, the heat resistance and flame retardance of the wrap yarn is higher, and the wrap yarn is mainly used for improving the flame retardance and heat resistance of the high temperature resistant yarn. In comparison with the strength of the wrap yarn, the strength of the inner core yarn is higher, and the inner core yarn is mainly used for improving the strength of the high temperature resistant yarn. At the same time, the heat resistance and flame retardance of the inner core yarn are good, and when the wrap yarn and the inner core yarn are made into a high temperature resistant yarn, the heat resistance and flame retardance thereof will not be greatly affected. Therefore, the high temperature resistant yarn as prepared has excellent flame retardance and heat resistance, as well as improved strength.

The mass fraction of the first flame retardant fiber in the wrap yarn is 50~80%, and the mass fraction of the second flame retardant fiber is 20~50%. The wrap yarn made of the first flame retardant fiber and the second flame retardant fiber in the above blending ratio has good flame retardance and high strength.

It should be noted that, the wrap yarn according to the invention does not contain viscose or flame retardant viscose. Although the flame retardance of a flame retardant viscose is not bad, it has poor high temperature resistance, and tends to deform and becomes brittle in an external environment of 500°C and above. Therefore, holes may appear on a cloth made of such wrap yarn, which affects the high temperature resistance thereof.

The high temperature resistant yarn is spun by the process below.

Any one or more of a basalt filament, a PI filament, an aramid fiber 1414 filament and a POD filament are selected as the core yarn, and the filament Denier is 50-100D.

The wrap yarn is a mixture of staple fibers, wherein one or more of preoxidized fiber, glass fiber, carbon fiber and PBI fiber are selected as the first flame retardant fiber, and any one or more of aramid 1414 fiber, POD fiber and PI fiber are selected as the second flame retardant fiber; Staple fibers of the first flame retardant fiber and the second flame retardant fiber are employed as the raw material, then they are mixed, loosed and cleaned in a blending ratio of 50-80: 20-50 (mass ratio) of the first flame retardant fiber to the second flame retardant fiber, and then one-passage carding is performed by a cover carding machine to form wool top of 4.5g/10m, and then a wrap yarn is prepared via a drawing process, wherein 8-top three-passage drawing is employed, with a drawing quantity of 7.59/10m.

A high temperature resistant yarn is obtained from filaments of the wrap yarn and the core yarn via a core spinning process: the drawn thread is fed into a roving machine, the roving twist is Z twist; the twist level is controlled as 85 twists/10cm, and a core spinning process is performed, the yarn count is controlled as 18-28s for one-ply yarn, and then two plies are combined, the twist is S twist, and the twist level is controlled as 70 twists/10cm.

The weight ratio of the core yarn to the wrap yarn is 15~40:85~60.

The modification of the spinning process is adjusted according to the fiber features, and the Roller position is modified to guarantee a control force on the fiber and improve the yarn quality; and the speed is lowered to avoid the phenomenon of static electricity, etc.

The invention further provides a composite fabric prepared by weaving the above high temperature resistant yarn. The composite fabric has high strength and good flame retardance, and it can be widely applied to protective suit.

The composite fabric is prepared by interweaving a warp yarn and a weft yarn, wherein the warp yarn and the weft yarn are both made of two high temperature resistant yarns. Because the warp yarn and the weft yarn are both made of two high temperature resistant yarns, the strength of the warp yarn and the weft yarn can be improved, and hence the strength of the composite fabric can be further improved.

The composite fabric is weaved in the process below: twill weave or diversified twill weave is employed, a gripper loom is selected for weaving, the machine tension is 15~20N, the spinning speed is 250~350r/min, and the gram weight is 180~500g/m2.

Optionally, 3/1 or 2/2 twill weave is employed, and the gram weight is 240~320g/m2.

A finishing process below further needs to be carried out on the composite fabric weaved: the grey cloth obtained via weaving is introduced into a tank steaming machine in the form of a fabric roll. A bidirectional variable-speed air jet device is employed, and the fabric is preshrunk via a high temperature airflow. Next, the fabric is introduced into a setting machine, wherein direct dry heat setting is employed, the speed is 30~60m/min, the temperature is 120~180°C, and a overfeed mode is employed.

The bidirectional variable-speed air jet device is much better than the ordinary spring resetting device. The gas capacity of the gas path may be reduced, and the retardation coefficient of the main nozzle on the gas path may be lowered. By employing a direct dry heat setting process, the disadvantage of low strength may be avoided, so that the strength can be equal to or slightly larger than the theoretical value.

The overfeed process may guarantee good dimensional stability of the fabric. Moreover, the process is mainly employed to guarantee a good style quality and smoothness of the cloth surface while ensuring strength.

Referring to Fig. 1, the invention further provides a protective fabric 10, which includes the above composite fabric 100, a first aluminium film 200 and second aluminium film 300. The first aluminium film 200 is provided between the composite fabric 100 and the second aluminium film 300.

The aluminium film compounded on the composite fabric can reflect the heat, and the high temperature resistance of the composite fabric can be improved. In the invention, the durability of the aluminium film can be improved by combining two aluminium films, so that the composite fabric 100 will not be modified in an environment of 1000°C. A polyethylene glycol terephthalate (PET) or polyurethane (PU) film is provided between the first aluminium film 200 and the second aluminium film 300.

The method for compounding the aluminium film onto the composite fabric includes the following steps.

The first aluminium film is compounded via hot-melt application: a high temperature resistant PU is heated to melt via wet solidification to trigger a cross-link reaction, then injected into a glue tank and extruded into the holes of an engraving roll that is rotating, and then the glue in the holes is transferred to the aluminium film by pressing, and the aluminium film and the fabric are combined by laminating via a laminating roll.

The second aluminium film is compounded via a thermal transfer compounding process: a PU or PET film is coated on the first layer of aluminium film that is compounded, and then the second aluminium film is applied onto the first aluminium film that is compounded.

The high temperature resistant yarn, the composite fabric and the protective fabric according to the invention will be further described in detail below in conjunction with specific embodiments.

Embodiment 1 This embodiment of the invention provides a high temperature resistant yarn, a composite fabric and a protective fabric.

The high temperature resistant yarn includes a core yarn and a wrap yarn, wherein the core yarn is made of PI filament, and the wrap varn is made of, in mass fraction, 70% of preoxidized staple fiber and 30% of aramid 1414 staple fiber, and the high temperature resistant yarn is obtained by spinning the core yarn and the wrap yarn in a mass ratio 25:75.

The composite fabric is prepared by weaving the high temperature resistant yarn.

The protective fabric includes the composite fabric, a first aluminium film and a second aluminium film, wherein the first aluminium film is provided between the composite fabric and the second aluminium film, and a PET film is provided between the first aluminium film and the second aluminium film.

Embodiment 2 This embodiment of the invention provides a high temperature resistant yarn, a composite fabric and a protective fabric.

The high temperature resistant yarn includes a core yarn and a wrap yarn, wherein the core yarn is prepared by blending aramid fiber 1414 filament and POD filament, the wrap yarn is made of, in mass fraction, 40% of glass fiber, 40% of carbon fiber, 10% of POD staple fiber and 10% of PI staple fiber, and the high temperature resistant yarn is obtained by spinning the core yarn and the wrap yarn in a mass ratio of 15: 85. The composite fabric is prepared by weaving the high temperature resistant yarn.

Embodiment 3 This embodiment of the invention provides a high temperature resistant yarn, a composite fabric and a protective fabric The high temperature resistant yarn includes a core yarn and a wrap yarn, wherein the core yarn is made of basalt filament, the wrap yarn is made of, in mass fraction, 50% of PBI staple fiber, 20% of POD staple fiber and 30% of aramid 1414 staple fiber, and the high temperature resistant yarn is obtained by spinning the core yarn and the wrap yarn in a mass ratio of 40: 60.

Embodiment 4 This embodiment of the invention provides a high temperature resistant yarn, a composite fabric and a protective fabric.

The high temperature resistant yarn includes a core yarn and a wrap yarn, wherein the core yarn is made of aramid fiber 1414 filament and POD filament, the wrap yarn is made of, in mass fraction, 60% of PBI staple fiber, 20% of POD staple fiber, 10% of aramid 1414 staple fiber and 10% of PI staple fiber, and the high temperature resistant yarn is obtained by spinning the core yarn and the wrap yarn in a mass ratio of 30: 70.

Comparative Example 1 This Comparative Example of the invention provides a high temperature resistant yarn, a composite fabric and a protective fabric.

The high temperature resistant yarn includes a core yarn and a wrap yarn, wherein the core yarn is made of PI filament, the wrap yarn is made of aramid 1414 staple fiber, and the high temperature resistant yarn is obtained by spinning the core yarn and the wrap yarn in a mass ratio 25:75.

Comparative Example 2 This Comparative Example of the invention provides a high temperature resistant yarn, a composite fabric and a protective fabric.

The high temperature resistant yarn includes a core yarn and a wrap yarn, wherein the core yarn is made of PI filament, the wrap yarn is made of preoxidized staple fiber, and the high temperature resistant yarn is obtained by spinning the core yarn and the wrap yarn in a mass ratio 25:75.

Comparative Example 3 This Comparative Example of the invention provides a high temperature resistant yarn, a composite fabric and a protective fabric. The high temperature resistant yarn includes a core yarn and a wrap yarn, wherein the core yarn is made of PI filament, the wrap yarn is made of, in mass fraction, 70% of preoxidized staple fiber and 30% of aramid 1414 staple fiber, and the high temperature resistant yarn is obtained by spinning the core yarn and the wrap yarn in a mass ratio 25:75. The composite fabric is prepared by weaving the high temperature resistant yarn. The protective fabric includes the composite fabric and an aluminium film. Test Example 1 Protective suits made of the protective fabric according to Embodiments 1~4 are tested according to the standards of GB8965.2 Protective Suit, Flame Retardant Protection, Part 2: welding suit and ISO 11612 respectively, and the results are shown in Table 1. Table 1: Test Results on GB8965.2 and ISO 11612 Standards Embodiment 2 | Embodiment3 | Embodiment 4 ISO 11612 Class 2 Class 2 Class 2 Class 2 spatter

FH - | | | Retardant Mela Meliogl vy oye GB8985.2 . PASS PASS PASS PASS Resistance Thermal / 53% £3% 53% £3% | Test Example 2 Protective suits made of the protective fabric according to Embodiment 1 and Comparative Examples 1-3 are respectively tested for the warp breaking strength, weft breaking strength, warp tearing strength, weft tearing strength, afterflame time, afterglow time, damaged length, aluminum protection level and iron protection level, and the results are shown in Table 2:

Table 2: Test Results on Strength and Flame Retardant Warp Wat ee u ] ‚ Demsgsd [| Alumna fron oe ‚ | strengthin | strength ind tne {st tive {5} strength int | strength (ny } isen} aval level Embodiment | |

EEEN [omer | on ww [ee ee 1549 1316 182 | 148 1.2 36 D1 Ed Example 1 | deme: MW ww 19 em 1048 837 be | By D3 E3 Example 2 | omy | | EN ENE EN 1537 1208 181 | 128 3 D2 E2 Example 3 | It may be known from Embodiment 1 and Comparative Example 1 that, the wrap yarn of Comparative Example 1 does not inclue the first flame retardant fiber, and the protective suit made of this wrap yarn has a smoldering time up to 1.2s, a damaged length up to 36mm, and the aluminum protection level and the iron protection level are only D2 and E2, which are lower than D3 and E3 of Embodiment 1, meaning that the flame retardance and high temperature resistance of the protective fabric of Comparative Example 1 are inferior than those of Embodiment 1. It may be known from Embodiment 1 and Comparative Example 2 that, the wrap yarn of Comparative Example 2 does not inclue the second flame retardant fiber, and the protective suit made of this wrap yarn are inferior in respect of warp breaking strengh, weft breaking strength, warp tearing strength and weft tearing strength, meaning that it has an inferior strength, and therefore is not favourable for spinging and weaving, and has too many knots in the yarn. It may be known from Embodiment 1 and Comparative Example 3 that, the protective fabric of Comparative Example 3 includes only one layer of aluminium film, and the aluminum protection level and the iron protection level of the protective suit made of this protective fabric are only D2 and E2, which are lower than those of Embodiment 1, which means that the protective fabric with only one layer of aluminium film has an inferior effect in respect of anti-radiation and heat insulation with respect to the two-layer aluminium film of Embodiment 1, and the high temperature resistance and flame retardance of which is inferior than those of Embodiment 1. In conclusion, in the high temperature resistant yarn according to the embodiments of the invention, a high strength and flame retardant yarn is employed for the inner core yarn, thus the strength of the high temperature resistant yarn may be improved, and skeleton support can be added to the high temperature resistant yarn. A high temperature resistant and flame retardant yarn is employed for the wrap yarn on the outer surface, thus the high temperature resistance of the high temperature resistant yarn may be improved. The high temperature resistant yarn prepared by fitting the core yarn and the wrap yarn has high strength and good spinnability, and good high-temperature resistance and flame retardance. A composite fabric prepared by weaving the above high temperature resistant yarn has high strength and good flame retardance, thus it can be widely applied to protective suit, etc. A protective fabric includes the above composite fabric, a first aluminium film and a second aluminium film, wherein the first aluminium film is provided between the composite fabric and the second aluminium film, thus a protective suit made of the protective fabric not only has good heat resistance, good flame retardance and high strength, but also has good durability and good spinnability.

The above description only shows preferred embodiments of the invention, rather than limiting the scope of the invention. For one skilled in the art, the invention may have various modifications and variations. Therefore, all modifications and equivalent substitutions made within the spirit and scope of the invention will fall into the protection scope of the invention.

Claims

CONCLUSIONS

A high temperature resistant yarn, characterized in that it comprises: a core yarn and a wrapping yarn that wraps the outer surface of the core yarn; wherein the core yarn comprises one from the group of a basalt filament, a polyimide filament, a poly-p-phenylene terephthamide filament and a poly-aromatic oxadiazole filament; and the wrapping yarn is obtained by forming a fiber containing a first flame retardant fiber and a second flame retardant fiber; wherein the first flame retardant fiber comprises one or more of a pre-oxidized fiber, a glass fiber, a carbon fiber or a polybenzimidazole fiber; and the second flame retardant fiber comprises one or more of a poly-p-phenylene tereftamide fiber, a polyaromatic oxadiazole fiber, and a polyimide fiber.

The high temperature resistant yarn according to claim 1, characterized in that a decomposition temperature of the first flame retardant fiber is not less than 600 ° C.

The high temperature resistant yarn according to claim 1, characterized in that a limiting oxygen index of the first flame retardant fiber is not less than 40%.

The high temperature resistant yarn according to claim 1, characterized in that a limiting oxygen index of the second flame retardant fiber is not less than 35%.

The high temperature resistant yarn according to claim 1, characterized in that a mass fraction of the first flame retardant fiber in the wrapping yarn is 50-80% and a mass fraction of the second flame retardant fiber is 20-50%.

A composite fabric, characterized in that the composite fabric is obtained by weaving the high temperature resistant yarn according to any one of claims 1-5.

The composite fabric according to claim 6, characterized in that the composite fabric is obtained by interweaving a warp yarn and a weft yarn, the warp yarn and the weft yarn being both made of two high temperature resistant yarns.

A protective fabric, characterized by comprising the composite fabric of claim 6 or 7, a first aluminum foil and a second aluminum foil, wherein the first aluminum foil is disposed between the composite fabric and the second aluminum foil.

9. The protective fabric according to claim 8, characterized in that between the first aluminum foil and the second aluminum foil a foil of polyethylene glycol terephthalate or polyurethane is arranged.