An electromagnetic shielding antistatic Raschel blanket

Abstract

This invention discloses an electromagnetically shielded antistatic Raschel blanket. It uses acrylic / polyester composite fibers with electromagnetic shielding function as the pile yarn and polyester as the base yarn, woven on a double-needle bed warp knitting machine to form a composite woven blanket fabric. The blanket fabric is then split to obtain a Raschel blanket semi-finished product. The Raschel blanket semi-finished product undergoes alkali reduction treatment, followed by pretreatment and post-treatment to obtain the finished electromagnetically shielded antistatic Raschel blanket. This invention possesses both conductivity and electromagnetic shielding functions, with durable electromagnetic shielding, meeting current demands for health-functional textiles.

Description

Technical Field

[0001] This invention relates to the field of Raschel blanket production technology, and particularly to an electromagnetically shielded antistatic Raschel blanket. Background Technology

[0002] Looking at the development trends of textiles both domestically and internationally, functional high-tech textiles have become the mainstream of market development. People not only demand warmth and aesthetics from textiles, but also place greater emphasis on comfort and functionality; functional textiles have become one of the future development trends of the textile industry. Blankets, as an important textile product, are gradually becoming necessities in daily life as people's living standards improve.

[0003] With the rapid development of technology, people are increasingly using electronic devices that emit electromagnetic radiation, leading to constant exposure to this radiation. Electromagnetic radiation affecting the human environment is categorized into natural and man-made sources. Natural electromagnetic radiation includes natural phenomena such as lightning, while man-made electromagnetic pollution primarily includes pulsed discharges, alternating power frequency magnetic fields, microwaves, and radio frequency electromagnetic radiation. Electromagnetic radiation exceeding 0.2 microtesla can pose certain health risks, with symptoms including eyelid swelling, bloodshot eyes, and skin allergies. To reduce the harm of electromagnetic radiation to the human body and the interference it causes to equipment, electromagnetic shielding technology and shielding materials have emerged.

[0004] Raschel blankets are made from polyester fibers using a Raschel warp knitting machine, and are produced through processes such as splitting, printing, finishing, and sewing. Hence the name Raschel blanket. Due to its soft feel, full pile, strong pile, and pleasing colors and patterns, it has gradually entered homes and become an important part of bedding. Raschel blankets are popular for their bright colors, good colorfastness, strong pattern design, soft pile, comfortable feel, good warmth retention, and resistance to deformation after washing. They are frequently used in household blankets, curtains, and car decorations. However, existing Raschel blankets, based on polyester, typically lack other special properties such as electromagnetic shielding. As people increasingly value health, traditional Raschel blankets cannot meet the needs of home textiles and outdoor use. Therefore, developing an electromagnetically shielded Raschel blanket is particularly important.

[0005] For example, CN112501905A describes a superhydrophobic electromagnetic shielding fabric and its preparation method. The superhydrophobic electromagnetic shielding fabric consists of a fabric and a superhydrophobic electromagnetic shielding layer on the fabric surface. The electromagnetic shielding layer is obtained by spraying a carbon black-carbon nanotube composite filler dispersion onto the fabric surface and drying it. CN108486555B describes a method for preparing a conductive and electromagnetic shielding fabric based on chemically plated tungsten-nickel alloy, in which a polyimide fabric is chemically plated with a tungsten-nickel alloy to obtain a conductive and electromagnetic shielding fabric. CN111364236A describes a flexible electromagnetic shielding fabric and its preparation method, which uses a layer-by-layer self-assembly technology to fix a layer of graphene oxide / Fe3O4 hybrid nanoparticles onto the fabric, thereby forming an electromagnetic shielding layer on the surface. While these methods can achieve good electromagnetic shielding effects, the coating is not water-resistant and cannot remain on the fabric surface for long periods. Furthermore, they do not address the structural design and construction of electromagnetic shielding Raschel blankets. Summary of the Invention

[0006] The purpose of this invention is to provide an electromagnetically shielded antistatic Raschel blanket that has both conductivity and electromagnetic shielding functions, with durable electromagnetic shielding capabilities, meeting the current demand for health-functional textiles.

[0007] The technical solution adopted by this invention to solve its technical problem is:

[0008] An electromagnetic shielding antistatic Raschel blanket is made of acrylic / polyester composite fiber with electromagnetic shielding function as pile yarn and polyester as base yarn, and is woven on a double needle bed warp knitting machine to form a blanket fabric with a composite woven structure. The blanket fabric is split to obtain a Raschel blanket semi-finished product.

[0009] The semi-finished Raschel blanket is treated with alkali reduction, and then pre-treatment and post-treatment are carried out to obtain the finished electromagnetic shielding antistatic Raschel blanket.

[0010] The acrylic / polyester composite fiber is a core-sheath structure composite fiber, wherein polyester serves as the sheath layer and acrylic fiber with electromagnetic shielding function serves as the core layer. The sheath layer accounts for 70% to 90% of the total mass, and the core layer accounts for 10% to 30% of the total mass.

[0011] Raschel tapestries are popular for their low price, soft feel, warmth, breathability, and pleasing colors and patterns, and are frequently used in decorative items. The main raw materials for Raschel tapestries are acrylic and polyester. However, due to the higher production cost of acrylic and its relatively similar overall performance to polyester blankets, it has gradually been replaced by polyester. However, directly coating the fibers with carbon-based electromagnetic shielding finishing liquid makes it difficult to guarantee the adhesion between the carbon-based liquid and the fabric, as well as effective shielding against electromagnetic radiation.

[0012] In this invention, the inventors used melt spinning to mix electromagnetic shielding material with polyacrylonitrile emulsion, followed by high-temperature melt spinning to obtain electromagnetic shielding monofilaments. These monofilaments were then mixed with polyester and woven to obtain a composite woven structure with two components and three layers of yarn. Compared to traditional Raschel blankets, this composite woven blanket has an additional layer of electromagnetic shielding monofilaments in its fabric structure, increasing the electromagnetic shielding effect and achieving a high level of electromagnetic interference shielding over a wide radio frequency range. Furthermore, due to the core-sheath structure and the protective polyester layer on the surface, it exhibits excellent washability and abrasion resistance.

[0013] The composite weaving structure is a two-component, three-layer yarn weaving structure. The polyester fabric, made by interlacing two weft yarns and two warp yarns, serves as the upper and lower surfaces of the composite weaving structure. Acrylic / polyester composite fiber monofilaments with electromagnetic shielding function are inserted into the middle of the structure in the weft direction to form an intermediate layer.

[0014] The acrylic / polyester composite fiber with electromagnetic shielding function is prepared by the following method:

[0015] (1) Raw material ratio: each raw material by weight is 80-100 parts of polyacrylonitrile emulsion (solid content 25-35%), 2-10 parts of electromagnetic shielding particles, 7-10 parts of dispersant, and 2-5 parts of surface treatment agent;

[0016] (2) Mixing: First, stir and mix the electromagnetic shielding particles with the dispersant and surface treatment agent, then mix with the polyacrylonitrile emulsion, melt spin and obtain electromagnetic shielding acrylic fiber.

[0017] The electromagnetic shielding particles are selected from one or more of the following nanomaterials: silver, copper, silver-plated aluminum, silver-plated glass, multi-walled carbon nanotubes, graphene, graphite nanosheets, and expanded graphite. The electromagnetic shielding particle material is preferably a mixture of multi-walled carbon nanotubes and graphite nanosheets, with a mass ratio of multi-walled carbon nanotubes to graphite nanosheets of 1-2:2-1.

[0018] The dispersant is one or more of OP-10, polyepoxy vinyl ether, anionic polyacrylic acid, maleic anhydride, and sodium polyether polycarboxylate sulfonate.

[0019] The surface treatment agent is any one of polyacrylamide, potassium polyacrylate, sodium polyacrylate, zinc polyacrylate, and aluminum polyacrylate.

[0020] The acrylic / polyester composite fiber with electromagnetic shielding function has a cross-section of one of the following: herringbone, star-shaped, triangular, or star-shaped, with a fineness of 150D / 72F. In this invention, the inventors designed the structure and properties of the core-sheath composite fiber, using herringbone, star-shaped, triangular, or star-shaped spinning components to obtain a core-sheath composite fiber with an irregular cross-section, giving the composite fiber moisture-wicking and breathable properties.

[0021] The alkaline solution used in the alkali reduction treatment is obtained by mixing any one of sodium hydroxide and potassium hydroxide with any one of sodium bicarbonate, sodium carbonate, sodium phosphate, and potassium carbonate in a mass ratio of 1-2:2-4 and dissolving it in water; the mass concentration of the alkaline solution is 7-15 g / L; the temperature of the alkali reduction treatment is 75-85℃ and the time is 7-10 min.

[0022] The pretreatment includes shaping and ironing. The shaping temperature is 85-90℃ and the step speed is 3-6m / min; the ironing temperature is 175-180℃ and the step speed is 12-15m / min.

[0023] The post-processing includes: shaping, raising, brushing, ironing, shearing, and compound embossing of the dyed semi-finished product; wherein the brushing speed is 3-4 m / min, the brush spacing is 2-3 mm; the ironing temperature is 120-130℃, and the step speed is 8-9 m / min.

[0024] After alkali reduction treatment, followed by pretreatment and posttreatment, wrinkles and internal stress in the polyester fabric are eliminated, preventing curling during printing. At the same time, oil on the fabric surface is effectively removed, and the luster of the pile is changed, which is beneficial to the production of subsequent processes and the style of the final carpet.

[0025] To achieve a full and thick feel in electromagnetic shielding antistatic Raschel blankets, multiple experiments and optimizations were conducted on the temperature and speed of brushing, ironing, and cutting during processing.

[0026] The beneficial effects of this invention are:

[0027] (1) A two-component, three-layer Raschel blanket was designed and woven on a double-needle bed warp knitting machine using composite fibers with acrylic as the core layer and polyester as the bottom yarn, which can carry electromagnetic shielding and antistatic materials. This Raschel blanket has strong wear resistance, and its electromagnetic radiation resistance after 50 rubs is much higher than that of traditional Raschel blankets. In addition, the raw material composition is relatively simple. These factors are conducive to the popularization and application of this tapestry.

[0028] (2) By spinning composite fibers with different cross-sections through the star-shaped and triangular spinning nozzles, not only is air circulation facilitated and breathability achieved, but it also has a good antistatic effect. Furthermore, through alkali reduction treatment, regular fine grooves and fine cavities are formed on the surface, which are conducive to achieving optimal electromagnetic shielding performance.

[0029] (3) The pre-treatment and post-treatment processes are reasonable. Optimizing the process can produce Raschel blankets with electromagnetic shielding and antistatic properties. The product surface will not have white hair, it has a bright luster, a good feel, will not shed hair, and the pile is elastic, which can meet people's expectations for high-end blankets with electromagnetic shielding function. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of one type of composite braided structure of the present invention. Detailed Implementation

[0031] The technical solution of the present invention will be further described in detail below through specific embodiments.

[0032] In this invention, unless otherwise specified, all raw materials and equipment used are commercially available or commonly used in the field. The methods described in the following embodiments are conventional methods in the field, unless otherwise specified.

[0033] In the following embodiments, the composite braided structure is a two-component, three-layer yarn braided structure. Two weft yarns and two warp yarns are interwoven to form a polyester fabric, which serves as the upper and lower surface layers 1 of the composite braided structure. An acrylic / polyester composite fiber monofilament with electromagnetic shielding function is inserted into the middle of the structure in the weft direction to form an intermediate layer 2. Figure 1 ).

[0034] Example 1:

[0035] An electromagnetic shielding antistatic Raschel blanket is described, wherein the electromagnetic shielding antistatic Raschel blanket is made of electromagnetic shielding acrylic / polyester as the pile yarn and polyester as the base yarn, and is designed and woven on a double needle bed warp knitting machine to create a blanket fabric with a composite weave structure. The acrylic / polyester composite fiber is a core-sheath structure composite fiber, with polyester as the sheath layer and acrylic with electromagnetic shielding function as the core layer. The sheath layer accounts for 70% of the mass percentage and the core layer accounts for 30% of the mass percentage.

[0036] After weaving, the greige fabric is split to obtain a semi-finished electromagnetic shielding antistatic Raschel blanket. The semi-finished Raschel blanket is first pretreated with alkali reduction, and then pre-treatment and post-treatment are carried out to obtain the finished electromagnetic shielding Raschel blanket.

[0037] Electromagnetic shielding acrylic fibers are prepared by the following method:

[0038] (1) Raw material ratio: each raw material is in parts by weight: 100 parts of polyacrylonitrile emulsion (30% solid content, commercially available), 3 parts of multi-walled carbon nanotubes, 7 parts of polyepoxy vinyl ether, and 2 parts of polyacrylamide.

[0039] (2) Mixing preparation: First, multi-walled carbon nanotubes are mixed with polyepoxy vinyl ether and polyacrylamide, then mixed with polyacrylonitrile emulsion, melt-spun, and electromagnetic shielding monofilaments with cross-sections of X-shaped spinnerets are spun out. The fineness of the monofilaments is 150D / 72F.

[0040] The alkaline solution used in the alkali reduction treatment is prepared by mixing sodium hydroxide and sodium bicarbonate in a 1:2 mass ratio to obtain an alkaline solution with a mass concentration of 10 g / L. The treatment temperature is 80℃, and the treatment time is 10 min.

[0041] The pretreatment consists of shaping and ironing. The shaping temperature is 90℃ and the step speed is 5m / min; the ironing temperature is 180℃ and the step speed is 12m / min.

[0042] In the post-processing stage, the dyed semi-finished product undergoes shaping, napping, brushing, ironing, shearing, and composite embossing to obtain the finished Raschel blanket. The brushing speed is 3m / min, and the brush spacing is 2.5mm; the shearing temperature is 120℃, and the step speed is 8m / min.

[0043] The shielding effectiveness of Raschel blankets for electromagnetic shielding was tested according to GB / T 30142-2013, "Test Method for Shielding Effectiveness of Planar Electromagnetic Shielding Materials". The shielding effect was tested within the 1-10 GHz range. The measured shielding effectiveness (SE) was 55.2 dB.

[0044] According to GB / T12703-91 Electrostatic Testing of Textiles, the antistatic properties of electromagnetic shielding antistatic Raschel blankets were tested, and the half-life was 1.2s.

[0045] According to GB / T 3921—2008 Test Method for Color Fastness to Washing of Textiles, the Raschel blanket was washed 10 times to test its electromagnetic shielding effect, and the SE value was 55.1dB.

[0046] Example 2:

[0047] An electromagnetic shielding antistatic Raschel blanket is described, wherein the electromagnetic shielding antistatic Raschel blanket is made of electromagnetic shielding acrylic / polyester as the pile yarn and polyester as the base yarn, and is designed and woven on a double needle bed warp knitting machine to create a blanket fabric with a composite weave structure. The acrylic / polyester composite fiber is a core-sheath structure composite fiber, with polyester as the sheath layer and acrylic with electromagnetic shielding function as the core layer. The sheath layer accounts for 80% of the mass percentage and the core layer accounts for 20% of the mass percentage.

[0048] After weaving, the greige fabric is split to obtain a semi-finished electromagnetic shielding antistatic Raschel blanket. The semi-finished Raschel blanket is first pretreated with alkali reduction, and then pre-treatment and post-treatment are carried out to obtain the finished electromagnetic shielding Raschel blanket.

[0049] Electromagnetic shielding acrylic fibers are prepared by the following method:

[0050] (1) Raw material ratio: each raw material is in parts by weight: 100 parts of polyacrylonitrile emulsion (30% solid content, commercially available), 3 parts of graphite nanosheets, 8 parts of polyepoxy vinyl ether, and 3 parts of polyacrylamide.

[0051] (2) Mixing preparation: First, graphite nanosheets are mixed with polyvinyl ether and polyacrylamide, then mixed with polyacrylonitrile emulsion, melt-spun, and electromagnetic shielding monofilaments with cross-sections of X-shaped spinnerets are spun out. The fineness of the monofilaments is 150D / 72F.

[0052] The alkaline solution used in the alkali reduction treatment is prepared by mixing sodium hydroxide and sodium bicarbonate at a mass ratio of 1:2, resulting in an alkaline solution with a mass concentration of 12 g / L. The treatment temperature is 80°C, and the treatment time is 8 min.

[0053] The pretreatment consists of shaping and ironing. The shaping temperature is 90℃ and the step speed is 5m / min; the ironing temperature is 180℃ and the step speed is 12m / min.

[0054] In the post-processing stage, the dyed semi-finished product undergoes shaping, napping, brushing, ironing, shearing, and composite embossing to obtain the finished Raschel blanket. The brushing speed is 3m / min, and the brush spacing is 2.5mm; the shearing temperature is 120℃, and the step speed is 8m / min.

[0055] The shielding effectiveness of Raschel blankets for electromagnetic shielding was tested according to GB / T 30142-2013, "Test Method for Shielding Effectiveness of Planar Electromagnetic Shielding Materials". The shielding effect was tested within the 1-10 GHz range. The measured shielding effectiveness (SE) was 53.4 dB.

[0056] According to GB / T12703-91 Electrostatic Testing of Textiles, the antistatic properties of electromagnetic shielding antistatic Raschel blankets were tested, and the half-life was 1.2s.

[0057] According to GB / T 3921—2008 Test Method for Color Fastness to Washing of Textiles, the Raschel blanket was washed 10 times to test its electromagnetic shielding effect, and the SE value was 53.2dB.

[0058] Example 3:

[0059] An electromagnetic shielding antistatic Raschel blanket is described, wherein the electromagnetic shielding antistatic Raschel blanket is made of electromagnetic shielding acrylic / polyester as the pile yarn and polyester as the base yarn, and is designed and woven on a double needle bed warp knitting machine to create a blanket fabric with a composite weave structure. The acrylic / polyester composite fiber is a core-sheath structure composite fiber, with polyester as the sheath layer and acrylic with electromagnetic shielding function as the core layer. The sheath layer accounts for 70% of the mass percentage and the core layer accounts for 30% of the mass percentage.

[0060] After weaving, the greige fabric is split to obtain a semi-finished electromagnetic shielding antistatic Raschel blanket. The semi-finished Raschel blanket is first pretreated with alkali reduction, and then pre-treatment and post-treatment are carried out to obtain the finished electromagnetic shielding Raschel blanket.

[0061] Electromagnetic shielding acrylic fibers are prepared by the following method:

[0062] (1) Raw material ratio: each raw material is in parts by weight: 100 parts of polyacrylonitrile emulsion (30% solid content, commercially available), 3 parts of mixture of multi-walled carbon nanotubes and graphite nanosheets, 8 parts of polyepoxy vinyl ether, and 3 parts of polyacrylamide.

[0063] (2) Mixing preparation: First, mix the mixture of multi-walled carbon nanotubes and graphite nanosheets (multi-walled carbon nanotubes: graphite nanosheets = 2:1 mass ratio) with polyvinyl ether and polyacrylamide, then mix with polyacrylonitrile emulsion, melt spin, and spin electromagnetic shielding monofilaments with a cross-section of 150D / 72F using a star-shaped spinning nozzle.

[0064] The alkaline solution used in the alkali reduction treatment is prepared by mixing sodium hydroxide and sodium bicarbonate in a 1:2 mass ratio to obtain an alkaline solution with a mass concentration of 10 g / L. The treatment temperature is 80℃, and the treatment time is 10 min.

[0065] The pretreatment consists of shaping and ironing. The shaping temperature is 90℃ and the step speed is 5m / min; the ironing temperature is 180℃ and the step speed is 12m / min.

[0066] In the post-processing stage, the dyed semi-finished product undergoes shaping, napping, brushing, ironing, shearing, and composite embossing to obtain the finished Raschel blanket. The brushing speed is 3m / min, and the brush spacing is 2.5mm; the shearing temperature is 120℃, and the step speed is 8m / min.

[0067] The shielding effectiveness of Raschel blankets for electromagnetic shielding was tested according to GB / T 30142-2013, "Test Method for Shielding Effectiveness of Planar Electromagnetic Shielding Materials". The shielding effect was tested within the 1-10 GHz range. The measured shielding effectiveness (SE) was 78.4 dB.

[0068] According to GB / T12703-91 Electrostatic Testing of Textiles, the antistatic properties of electromagnetic shielding antistatic Raschel blankets were tested, with a half-life of 1 s.

[0069] According to GB / T 3921—2008 Test Method for Color Fastness to Washing of Textiles, the Raschel blanket was washed 10 times to test its electromagnetic shielding effect, and the SE value was 78.3dB.

[0070] Example 4:

[0071] An electromagnetic shielding antistatic Raschel blanket, wherein the electromagnetic shielding antistatic Raschel blanket is made of electromagnetic shielding acrylic / polyester as the pile yarn and polyester as the base yarn, and is designed and woven on a double needle bed warp knitting machine to create a blanket fabric with a composite weave structure. The acrylic / polyester composite fiber is a core-sheath structure composite fiber, with polyester as the sheath layer and acrylic with electromagnetic shielding function as the core layer. The sheath layer accounts for 80% of the mass percentage and the core layer accounts for 20% of the mass percentage.

[0072] After weaving, the greige fabric is split to obtain a semi-finished electromagnetic shielding antistatic Raschel blanket. The semi-finished Raschel blanket is first pretreated with alkali reduction, and then pre-treatment and post-treatment are carried out to obtain the finished electromagnetic shielding Raschel blanket.

[0073] Electromagnetic shielding acrylic fibers are prepared by the following method:

[0074] (1) Raw material ratio: each raw material is in parts by weight: 100 parts of polyacrylonitrile emulsion (30% solid content, commercially available), 3 parts of mixture of multi-walled carbon nanotubes and graphite nanosheets, 8 parts of polyepoxy vinyl ether, and 3 parts of polyacrylamide.

[0075] (2) Mixing preparation: First, mix the mixture of multi-walled carbon nanotubes and graphite nanosheets (multi-walled carbon nanotubes: graphite nanosheets = 1:2 mass ratio) with polyvinyl ether and polyacrylamide, then mix with polyacrylonitrile emulsion, melt spin, and spin electromagnetic shielding monofilaments with a cross-section of 150D / 72F using a star-shaped spinning nozzle.

[0076] The alkaline solution used in the alkali reduction treatment is prepared by mixing sodium hydroxide and sodium bicarbonate in a 1:2 mass ratio to obtain an alkaline solution with a mass concentration of 10 g / L. The treatment temperature is 80℃, and the treatment time is 10 min.

[0077] The pretreatment consists of shaping and ironing. The shaping temperature is 90℃ and the step speed is 5m / min; the ironing temperature is 180℃ and the step speed is 12m / min.

[0078] In the post-processing stage, the dyed semi-finished product undergoes shaping, napping, brushing, ironing, shearing, and composite embossing to obtain the finished Raschel blanket. The brushing speed is 3m / min, and the brush spacing is 2.5mm; the shearing temperature is 120℃, and the step speed is 8m / min.

[0079] The shielding effectiveness of Raschel blankets for electromagnetic shielding was tested according to GB / T 30142-2013, "Test Method for Shielding Effectiveness of Planar Electromagnetic Shielding Materials". The shielding effect was tested within the 1-10 GHz range. The measured shielding effectiveness (SE) was 69.7 dB.

[0080] According to GB / T12703-91 Electrostatic Testing of Textiles, the antistatic properties of electromagnetic shielding antistatic Raschel blankets were tested, and the half-life was 1.2s.

[0081] According to GB / T 3921—2008 Test Method for Color Fastness to Washing of Textiles, the Raschel blanket was washed 10 times to test its electromagnetic shielding effect, and the SE value was 69.6dB.

[0082] Comparative Example 1:

[0083] Raschel blankets purchased from the market without electromagnetic shielding and antistatic treatment were tested for shielding effectiveness according to GB / T 30142-2013, "Test Method for Shielding Effectiveness of Planar Electromagnetic Shielding Materials". The shielding effect was tested within the 1-10 GHz range. The measured SE (Shielding Effectiveness) was 0 dB.

[0084] According to national standards, when SE > 60dB, the electromagnetic shielding effect is excellent; when 60dB ≥ SE > 50dB, the electromagnetic shielding effect is very good; when 50dB ≥ SE > 40dB, the electromagnetic shielding effect is good; when 40dB ≥ SE > 30dB, the electromagnetic shielding effect is poor; when 30dB ≥ SE > 20dB, the electromagnetic shielding effect is relatively poor; and when SE ≤ 20dB, there is almost no shielding effect. Compared with other electromagnetic shielding materials of the same dosage, Examples 3 and 4, using a mixture of multi-walled carbon nanotubes and graphite nanosheets as electromagnetic shielding materials, show a significant improvement in electromagnetic shielding effect compared to using multi-walled carbon nanotubes or graphite nanosheets alone. Example 3 achieves the best electromagnetic shielding effect because multi-walled carbon nanotubes have a large specific surface area, while graphite nanosheets have a small specific surface area. The two interlock to obtain a better electromagnetic shielding material, and the electromagnetic shielding effect remains almost unchanged after multiple water washes, indirectly increasing the added value of the product, conforming to consumer management, and bringing new social and economic benefits.

[0085] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the present invention in any way. Other variations and modifications are possible without departing from the technical solutions described in the claims.

Claims

1. An electromagnetically shielded antistatic Raschel blanket, characterized in that, Using acrylic / polyester composite fibers with electromagnetic shielding function as pile yarn and polyester as base yarn, a composite woven blanket fabric is woven on a double needle bed warp knitting machine. The blanket fabric is then split to obtain Raschel blanket semi-finished product. The semi-finished Raschel blanket is treated with alkali reduction, and then pre-treatment and post-treatment are carried out to obtain the finished electromagnetic shielding antistatic Raschel blanket. The acrylic / polyester composite fiber is a core-sheath structure composite fiber, wherein polyester serves as the sheath layer and acrylic fiber with electromagnetic shielding function serves as the core layer, with the sheath layer accounting for 70% to 90% of the mass and the core layer accounting for 10% to 30% of the mass. The composite weaving structure is a two-component, three-layer yarn weaving structure. The polyester fabric made by interlacing two weft yarns and two warp yarns serves as the upper and lower surfaces of the composite weaving structure. Acrylic / polyester composite fiber monofilaments with electromagnetic shielding function are inserted into the middle of the structure in the weft direction to form an intermediate layer. The acrylic fiber with electromagnetic shielding function is prepared by the following method: (1) Raw material ratio: each raw material is in parts by weight: 80-100 parts of polyacrylonitrile emulsion, 2-10 parts of electromagnetic shielding particles, 7-10 parts of dispersant, and 2-5 parts of surface treatment agent; the electromagnetic shielding particle material is a mixture of multi-walled carbon nanotubes and graphite nanosheets, with a mass ratio of multi-walled carbon nanotubes to graphite nanosheets of 1-2:2-1. (2) Mixing: First, stir and mix the electromagnetic shielding particles with the dispersant and surface treatment agent, then mix with the polyacrylonitrile emulsion, melt spin and obtain electromagnetic shielding acrylic fiber.

2. The electromagnetic shielding antistatic Raschel blanket according to claim 1, characterized in that, The dispersant is one or more of OP-10, polyepoxy vinyl ether, anionic polyacrylic acid, maleic anhydride, and sodium polyether polycarboxylate sulfonate.

3. The electromagnetic shielding antistatic Raschel blanket according to claim 1, characterized in that, The surface treatment agent is any one of polyacrylamide, potassium polyacrylate, sodium polyacrylate, zinc polyacrylate, and aluminum polyacrylate.

4. The electromagnetic shielding antistatic Raschel blanket according to claim 1, characterized in that, The acrylic fiber with electromagnetic shielding function has a cross-section that is herringbone, star-shaped, triangular, or star-shaped, and a fineness of 150D / 72F.

5. The electromagnetic shielding antistatic Raschel blanket according to claim 1, characterized in that, The alkaline solution used in the alkali reduction treatment is obtained by mixing any one of sodium hydroxide and potassium hydroxide with any one of sodium bicarbonate, sodium carbonate, sodium phosphate, and potassium carbonate in a mass ratio of 1-2:2-4 and dissolving it in water; the mass concentration of the alkaline solution is 7-15 g / L; the temperature of the alkali reduction treatment is 75-85℃ and the time is 7-10 min.

6. The electromagnetic shielding antistatic Raschel blanket according to claim 1, characterized in that, The pretreatment includes shaping and ironing. The shaping temperature is 85-90℃ and the step speed is 3-6m / min; the ironing temperature is 175-180℃ and the step speed is 12-15m / min.

7. The electromagnetic shielding antistatic Raschel blanket according to claim 1, characterized in that, The post-processing includes: shaping, brushing, brushing, heat pressing, heat cutting, and compound embossing of the dyed semi-finished product; wherein the brushing speed is 3-4 m / min and the brush spacing is 2-3 mm; the heat cutting temperature is 120-130℃ and the step speed is 8-9 m / min.

Images