Flame-retardant electromagnetic shielding fabric and preparation method thereof

Abstract

The invention relates to the technical field of textiles, and particularly discloses a flame-retardant electromagnetic shielding fabric and a preparation method thereof. The flame-retardant electromagnetic shielding fabric comprises a yarn A and a yarn B. The raw materials of the yarn A comprise copper plating silk fibers and aramid fibers. According to the electromagnetic shielding fabric, the yarn A obtained by utilizing the copper-plated silk fibers and the aramid fibers has better flexibility and is convenient to manufacture, so that the electromagnetic shielding fabric obtained by utilizing the yarn A has better wearability, the aramid fibers and the copper have better electromagnetic shielding performance, and the copper also has better flame-retardant performance, so that the finally obtained electromagnetic shielding fabric has better electromagnetic shielding performance. Compared with the prior art, the fabric has good mechanical property and flame retardant property, the metal wires are not prone to breakage in the using process, a good conductive grid can be formed through the characteristics of the copper-coated wires, and the resistance of the surface of the fabric is greatly reduced.

Description

Technical Field

[0001] The present application relates to the technical field of textiles, and in particular to a flame-retardant electromagnetic shielding fabric and a preparation method thereof. Background Art

[0002] With the dramatic increase in the use of electrical equipment, the impact of electromagnetic radiation is becoming increasingly serious. People are paying more and more attention to electromagnetic shielding. Electromagnetic waves of various frequency bands make electromagnetic pollution more and more serious. Whether at home or in the workplace, people are deeply affected by complex electromagnetic radiation. Electromagnetic pollution has become the fourth largest pollution after air, water and noise pollution. Electromagnetic radiation poses a huge hazard to human health. Electromagnetic radiation energy can be transmitted to cells, causing abnormal body temperature and protein inactivation, and increasing the possibility of gene mutation. The most common symptoms are headache, irritability, insomnia, fatigue or lack of concentration. Long-term electromagnetic radiation can lead to more serious diseases, such as leukemia and cancer. The most commonly used method to block electromagnetic radiation is to use electromagnetic shielding materials. The most direct protection for the human body is clothing fabric protection. People working with high voltage live electricity must not only prevent electromagnetic wave radiation, but also prevent electric sparks generated during the operation from causing fires and burns to the human body. Therefore, a flame-retardant and anti-electromagnetic shielding fabric is needed. There are three types of electromagnetic shielding fabrics currently on the market: metal-plated fabrics and conductive coated fabrics. These two types of fabrics are plated fabrics. Although they have good shielding effects, most of the processes contain heavy metals, and the sewage treatment is complicated. The plating is easy to fall off after washing and daily external forces. Metal fiber blended fabrics are fiber blended fabrics made by blending metal wires or metal wires drawn into fibers with commonly used textile fibers; or using metal as the core and covering it with commonly used textile fibers to make core-spun yarn; or using other textile technologies to combine metal fibers with textile fibers to make electromagnetic shielding fabrics. The metal wires used are mostly gold and silver, which are difficult to weave, easy to break when washed, and have poor wearing performance. Summary of the invention

[0003] In order to improve the wearing performance of electromagnetic shielding fabrics, the present application provides a flame retardant electromagnetic shielding fabric and a preparation method thereof.

[0004] In a first aspect, the present application provides a flame retardant electromagnetic shielding fabric, which adopts the following technical solution: A flame-retardant electromagnetic shielding fabric comprises a yarn A and a yarn B. The raw materials of the yarn A comprise copper-plated silk fiber and aramid.

[0005] By adopting the above technical scheme, the yarn A obtained by using copper-plated silk fiber and aramid has good flexibility and is manufactured. Therefore, the electromagnetic shielding fabric obtained by using yarn A has good wearing performance, and aramid and copper have good electromagnetic shielding performance, and copper also has good flame retardant properties. Therefore, the electromagnetic shielding fabric finally obtained has good mechanical properties and flame retardant properties, and the metal wire is not easy to break during use. Through the characteristics of copper-coated wire, a good conductive grid can be formed, which greatly reduces the resistance of the fabric surface.

[0006] In a specific embodiment, the mass ratio of aramid fiber to copper-plated silk fiber in the yarn A is 80:20 or 70:30.

[0007] By adopting the above technical scheme, too high aramid content will lead to poor electromagnetic shielding effect of the fabric, and too low content will lead to poor flexibility of the yarn and difficulty in weaving. Therefore, when the mass ratio of copper-plated silk fiber and aramid is 80:20 or 70:30, yarn A not only has better electromagnetic shielding effect, but also has better flexibility, which is conducive to weaving.

[0008] In a specific embodiment, the raw materials of the yarn B include aramid, polyimide, polyamide, nylon, chloronitrile, and stainless steel fiber, and the content of the stainless steel fiber is 10%-60%.

[0009] By adopting the above technical scheme, the electromagnetic shielding effect of the fabric can be further improved by blending stainless steel fiber with aramid, polyimide, polyamide, and nylon. Stainless steel fiber not only has excellent conductivity, but is also widely used in magnetic conductivity. Fabrics made of stainless steel fiber and copper-plated silk fiber are also soft and have excellent comprehensive properties, which can make up for the shortcomings of precious metals in textiles.

[0010] In a specific embodiment, the raw materials of the yarn B include aramid, FRV, and stainless steel.

[0011] By adopting the above technical solution and adding FRV fiber to the yarn B, the flame retardant performance of the fabric can be further improved.

[0012] In a specific possible implementation manner, the point-to-point resistance of the flame-retardant electromagnetic shielding fabric is 10-22 mΩ; the shielding effectiveness of the flame-retardant electromagnetic shielding fabric at an electromagnetic frequency of 50 Hz is 78.3-89.3 dB.

[0013] In a second aspect, the present application provides a method for preparing a flame retardant electromagnetic shielding fabric, which adopts the following technical solution: A method for preparing a flame retardant electromagnetic shielding fabric, comprising the following steps: Preparation of yarn A: Copper-plated silk fiber and aramid fiber are blended into yarn to obtain yarn A; Weaving: yarn A and yarn B are first warped with tension, and then transferred to the sizing machine for sizing. After sizing, they enter the reeding stage, and the threading method is straight threading. Finally, weaving is carried out to obtain flame-retardant electromagnetic shielding fabrics.

[0014] By adopting the above technical scheme, copper-plated silk fiber and aramid are first blended into yarn to obtain yarn A; then yarn A and yarn B are woven to obtain flame-retardant and electromagnetic shielding fabric with good flame-retardant and electromagnetic shielding properties.

[0015] In a specific embodiment, when the raw materials of the yarn B include stainless steel fiber and aramid fiber, the weaving step is: First, the stainless steel fiber and aramid fiber are blended into yarn to obtain yarn B; yarn A and yarn B are first warped with tension, and then transferred to a sizing machine for sizing. After the sizing is completed, the yarn enters the reeding stage, and six threads are selected, and the threading method is straight threading. Finally, weaving is performed, and the weaving structure is plain weave or surface-to-surface layer-changing structure to obtain a flame-retardant electromagnetic shielding fabric.

[0016] In a specific possible implementation scheme, when the woven structure is plain weave, the plain weave is a basic structure in which the warp and weft points alternate in a 1:1 ratio, and is formed by yarn A and yarn B interlaced alternately one above and one below, and a fabric structure formed by yarn A and yarn B sinking and floating on each other alternately.

[0017] In a specific feasible implementation scheme, when the woven structure is a surface-inside layer-changing structure, the surface warp and surface weft are aramid silk yarns, and the inner warp and inner weft are yarn B and yarn A, respectively, and are arranged at a 1:1 interval; the surface warp density is 200 strands / 10cm, the surface weft density is 180 strands / 10cm, the inner warp density is 195 strands / 10cm, and the inner weft density is 195 strands / 10cm.

[0018] By adopting the above technical solution, the inner and outer layer changing structure is a double-layer structure, and the upper and lower layers of the fabric can be connected together to form a larger pattern. In addition, the fabric is soft, and the double-layer structure can better improve the electromagnetic shielding effect.

[0019] In a specific embodiment, when the raw materials of the yarn B include aramid, FRV, and stainless steel, the weaving steps are: First, aramid, FRV and stainless steel are blended into yarn to obtain yarn B; yarn A and yarn B are first warped with tension, and then transferred to the sizing machine for sizing. After the sizing is completed, they enter the reeding stage, and three-threading is selected, and the threading method is straight threading. Finally, weaving is performed, and the weaving structure is twill structure to obtain flame-retardant electromagnetic shielding fabric.

[0020] In summary, the present application includes at least one of the following beneficial technical effects: 1. The yarn A obtained by using copper-plated silk fiber and aramid in the present application has good flexibility and is manufactured by using the yarn A. Therefore, the electromagnetic shielding fabric obtained by using the yarn A has good wearing performance, and aramid and copper have good electromagnetic shielding performance, and copper also has good flame retardant performance. Therefore, the electromagnetic shielding fabric finally obtained has good mechanical properties and flame retardant properties, and the metal wire is not easy to break during use. Through the characteristics of the copper-coated wire, a good conductive grid can be formed, which greatly reduces the resistance of the fabric surface; 2. In this application, the use of stainless steel fiber and aramid fiber for blending can further improve the electromagnetic shielding effect of the fabric. The stainless steel fiber not only has excellent electrical conductivity, but is also widely used in magnetic conductivity. The fabric made of stainless steel fiber and copper-plated silk fiber is also soft and has excellent comprehensive performance, which can make up for the deficiency of precious metals in textiles. 3. The method of the present application firstly blends copper-plated silk fiber with aramid fiber into yarn to obtain yarn A; then weaves yarn A and yarn B to obtain a flame-retardant and electromagnetic shielding fabric with good flame-retardant and electromagnetic shielding properties. DETAILED DESCRIPTION

[0021] The present application is further described in detail below with reference to the embodiments.

[0022] All raw materials in the examples can be obtained from commercial sources, wherein the aramid fiber is aramid 1313 provided by Taihe New Materials Group Co., Ltd., and the FRV fiber is provided by Lenzing Group. Example

[0023] Example 1 Embodiment 1 provides a method for preparing a flame retardant electromagnetic shielding fabric, comprising the following steps: Preparation of yarn A: copper-plated silk fiber and aramid fiber are blended into yarn by a compact spinning device to obtain yarn A; wherein the weight ratio of copper-plated silk fiber to aramid fiber is 20:80; Weaving: First, stainless steel fiber and aramid, polyimide, brodron and acrylic chlorofiber are blended into yarns through compact spinning equipment to obtain yarn B; the weight ratio of stainless steel fiber, aramid, polyimide, brodron and acrylic chlorofiber is 60:10:10:10:10; the strength of yarn A and yarn B are both greater than 600cN / tex, and then the warping tension is configured by the front, middle and back segmentation method, and then the yarn is transferred to the sizing machine for sizing. After the sizing is completed, it enters the reeding link, and six-entry is selected, and the threading method is straight threading. Finally, a rapier loom is used for weaving. The weaving structure is plain weave to obtain flame-retardant electromagnetic shielding fabric; wherein the plain weave is a basic structure in which the warp and weft points alternate in a ratio of 1:1, and is formed by yarn A and yarn B interlaced one above and one below, and the fabric structure formed by yarn A and yarn B sinking and floating one after another.

[0024] Example 2 The difference between Example 2 and Example 1 is that, in the weaving step, the weaving structure is a surface-inside layer-changing structure, the surface warp and surface weft are aramid silk yarn, the inner warp and inner weft are yarn B and yarn A respectively, and then arranged at a 1:1 interval; and the surface warp density of the obtained fabric is 200 yarns / 10cm, the surface weft density is 180 yarns / 10cm, the inner warp density is 195 yarns / 10cm, and the inner weft density is 195 yarns / 10cm; the surface aramid silk yarn density of the fabric is 40tex, the density of the inner yarn B is 37tex, and the density of the inner yarn A is 47.6tex; the remaining steps are consistent with Example 1.

[0025] Example 3 Embodiment 3 provides a method for preparing a flame retardant electromagnetic shielding fabric, comprising the following steps: Preparation of yarn A: copper-plated silk fiber and aramid fiber are blended into yarn by a compact spinning device to obtain yarn A; wherein the weight ratio of copper-plated silk fiber to aramid fiber is 20:80; Weaving: First, aramid, FRV and stainless steel are blended into yarns through compact spinning equipment to obtain yarn B; the weight ratio of aramid, FRV and stainless steel is 40:30:30; the strength of yarn A and yarn B are both greater than 600cN / tex, and then the warping tension is configured by the front, middle and back segmentation method, and then the yarn is transferred to the sizing machine for sizing. After the sizing is completed, it enters the reeding link, and three-threading is selected, and the threading method is straight threading. Finally, a rapier loom is used for weaving, and the weaving structure is twill structure; yarn B is used as the warp and weft yarns of the fabric, and yarn A is added every 0.5cm in the warp and weft directions to obtain a flame-retardant electromagnetic shielding fabric, and the warp density of the obtained fabric is 255 yarns / 10cm, and the weft density is 190 yarns / 10cm; the density of yarn B in the fabric is 59tex, and the density of yarn A is 42tex.

[0026] Example 4 The difference between Example 4 and Example 3 is that, in weaving, aramid, FRV and stainless steel are first blended into yarn by a compact spinning device to obtain yarn B; wherein the weight ratio of aramid, FRV and stainless steel is 40:30:30; the strength of yarn A and yarn B are both greater than 600 cN / tex, and then the warping tension is configured by the front, middle and back segmented method, followed by sizing on the sizing machine. After sizing, the yarn entering the reeding stage is performed, and three-threading is selected, and the threading method is straight threading. Finally, a rapier loom is used for weaving, and the weaving structure is a twill structure. Yarn A is added every 1 cm in the warp and weft directions to obtain a flame-retardant electromagnetic shielding fabric; the remaining steps are consistent with Example 3.

[0027] Example 5 The difference between Example 5 and Example 3 is that, in weaving, aramid, FRV and stainless steel are first blended into yarn by a compact spinning device to obtain yarn B; wherein the weight ratio of aramid, FRV and stainless steel is 40:30:30; the strength of yarn A and yarn B are both greater than 600 cN / tex, and then the warping tension is configured by the front, middle and back segmented method, followed by sizing on the sizing machine. After sizing, the yarn entering the reeding stage is performed, and three-threading is selected, and the threading method is straight threading. Finally, a rapier loom is used for weaving, and the weaving structure is a twill structure. Yarn A is added every 2 cm in the warp and weft directions to obtain a flame-retardant electromagnetic shielding fabric; the remaining steps are consistent with Example 3.

[0028] Comparative Example Comparative Example 1 Comparative Example 1 provides a method for preparing a flame retardant electromagnetic shielding cloth, comprising the following steps: Preparation of flame retardant liquid: 100 parts of polyurethane resin, 58 parts of decabromodiphenyl ether, 20 parts of antimony trioxide and 0.18 parts of sodium dodecylbenzene sulfonate were stirred and mixed uniformly to obtain a flame retardant liquid; Conductive liquid preparation: 100 parts of polyurethane resin, 85 parts of conductive nickel powder, 12 parts of decabromodiphenyl ether, 5 parts of antimony trioxide, and 5 parts of propylene glycol butyl ether were stirred and mixed uniformly to obtain a conductive liquid; Coating: Coat both sides of the fiber fabric with flame retardant liquid, then dry at 180℃ for 30s. The dry weight is recorded. The coating amount of flame retardant liquid on both sides is 17g / m 2 , 22g / m 2 Then, the conductive liquid was coated on one side of the fiber fabric and dried at 60°C for 10 seconds. The coating amount of the conductive liquid was 26 g / m 2 , and obtain a flame retardant electromagnetic shielding cloth.

[0029] Performance testing test Flame retardant performance: According to GB / T8965.1-2020 "Protective Clothing-Flame Retardant Clothing", the samples in each embodiment and comparative example were tested to obtain the damage length, afterflaming time and smoldering time in the warp combustion performance.

[0030] Electromagnetic shielding performance: According to GB / T6568-2008 "Shielding clothing for live working", the shielding effectiveness of the sample is tested at an electromagnetic frequency of 50HZ. The greater the shielding effectiveness, the better the electromagnetic shielding performance of the sample.

[0031] Table 1 Fabric performance test results Combining Example 1, Example 2 and Comparative Example 1, the flame retardant properties, electromagnetic shielding properties and strength of the fabrics in Example 1 and Example 2 are all better than those in Comparative Example 1. It can be seen that the yarn A obtained by using copper-plated silk fiber and aramid has good flexibility. By manufacturing, and then combining it with the yarn B obtained by blending stainless steel fiber and aramid, the obtained fabric not only has good flame retardant properties, but also has better electromagnetic shielding properties.

[0032] Combining Example 2 and Example 3, the shielding effectiveness of the fabric in Example 2 is 89.3dB, and the damage length in the warp combustion performance of the fabric is 104mm, the afterflaming time is 1.5s, and the smoldering time is 0s. Red heat will appear in the damaged area during the burning process, but there is no flowing or dripping burning material, no dripping, and the warp and weft yarns of the fabric after burning are intact, without obvious brittle cracks; while the shielding effectiveness of the fabric in Example 3 is 80.5dB, but the damage length in the warp combustion performance is 0mm, the afterflaming time is 0s, and the smoldering time is 0s. Red heat will appear in the damaged area during the burning process, but there is no flowing or dripping burning material, no dripping, and the warp and weft yarns of the fabric after burning are intact, without obvious brittle cracks. It can be seen that when the yarn B obtained by using aramid, FRV, and stainless steel fiber and the obtained fabric is a twill weave, the flame retardant properties of the final fabric will be improved, but the electromagnetic shielding performance will be slightly reduced.

[0033] In combination with Examples 3-5, it can be seen that when a rapier loom is used to weave twill weave, adding yarn A every 0.5 cm, 1 cm or 2 cm in the warp and weft directions can obtain a flame retardant electromagnetic shielding fabric with good performance.

[0034] This specific embodiment is merely an explanation of the present application and is not a limitation of the present application. After reading this specification, those skilled in the art may make modifications to the present embodiment without any creative contribution as needed, but such modifications are protected by the patent law as long as they are within the scope of the claims of the present application.

Claims

1. A flame retardant electromagnetic shielding fabric, comprising yarn A and yarn B, characterized in that: The raw materials of the yarn A include copper-plated silk fiber and aramid.

2. The flame retardant electromagnetic shielding fabric according to claim 1, characterized in that: The mass ratio of aramid fiber to copper-plated silk fiber in the yarn A is 80:20 or 70:

30.

3. The flame retardant electromagnetic shielding fabric according to claim 1, characterized in that: The raw materials of the yarn B include aramid, polyimide, polyamide, nylon, chloronitrile and stainless steel fiber, and the content of the stainless steel fiber is 10%-60%.

4. The flame retardant electromagnetic shielding fabric according to claim 1, characterized in that: The raw materials of the yarn B include aramid, FRV, and stainless steel.

5. The flame retardant electromagnetic shielding fabric according to claim 1, characterized in that: The point-to-point resistance of the flame-retardant electromagnetic shielding fabric is 10-22 mΩ; the shielding effectiveness of the flame-retardant electromagnetic shielding fabric at an electromagnetic frequency of 50 Hz is 78.3-89.3 dB.

6. A method for preparing the flame-retardant electromagnetic shielding fabric according to any one of claims 1 to 5, characterized in that: The following steps are involved: Preparation of yarn A: Copper-plated silk fiber and aramid fiber are blended into yarn to obtain yarn A; Weaving: yarn A and yarn B are first warped with tension, and then transferred to the sizing machine for sizing. After sizing, they enter the reeding stage, and the threading method is straight threading. Finally, weaving is carried out to obtain flame-retardant electromagnetic shielding fabrics.

7. The method for preparing a flame-retardant electromagnetic shielding fabric according to claim 6, characterized in that: When the raw materials of the yarn B include stainless steel fiber and aramid fiber, the weaving steps are: First, the stainless steel fiber and aramid fiber are blended into yarn to obtain yarn B; yarn A and yarn B are first warped with tension, and then transferred to a sizing machine for sizing. After the sizing is completed, the yarn enters the reeding stage, and six threads are selected, and the threading method is straight threading. Finally, weaving is performed, and the weaving structure is plain weave or surface-to-surface layer-changing structure to obtain a flame-retardant electromagnetic shielding fabric.

8. The method for preparing a flame-retardant electromagnetic shielding fabric according to claim 7, characterized in that: When the woven structure is plain weave, the plain weave is a basic structure in which the warp and weft points appear alternately in a 1:1 ratio, and is formed by yarn A and yarn B interlaced alternately one above and one below, and the yarn A and yarn B sink and float one after another to form a fabric structure.

9. The method for preparing a flame-retardant electromagnetic shielding fabric according to claim 7, characterized in that: When the weaving structure is a surface-to-back layer-changing structure, the surface warp and surface weft are aramid silk yarns, and the inner warp and inner weft are yarn B and yarn A respectively, and are arranged at a 1:1 interval; the surface warp density is 200 strands / 10cm, the surface weft density is 180 strands / 10cm, the inner warp density is 195 strands / 10cm, and the inner weft density is 195 strands / 10cm.

10. The method for preparing a flame-retardant electromagnetic shielding fabric according to claim 6, characterized in that: When the raw materials of the yarn B include aramid, FRV, and stainless steel, the weaving steps are: First, aramid, FRV and stainless steel are blended into yarn to obtain yarn B; yarn A and yarn B are first warped with tension, and then transferred to the sizing machine for sizing. After the sizing is completed, they enter the reeding stage, and three-threading is selected, and the threading method is straight threading. Finally, weaving is performed, and the weaving structure is twill structure to obtain flame-retardant electromagnetic shielding fabric.

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