Dustproof industrial yarn and method for manufacturing the same

Abstract

The application relates to the technical field of industrial yarns, and particularly discloses a dustproof industrial yarn and a preparation method thereof. The preparation method of the dustproof industrial yarn comprises the following steps: S1, polyester chips are extruded and melted to form a spinning melt, carbon fibers are added, and then the spinning melt is metered and jet-cooled to form a yarn bundle; S2, the yarn bundle obtained in step S1 is sequentially subjected to heat setting treatment, network treatment, film forming treatment and winding forming to obtain primary yarn; S3, the primary yarn obtained in step S2 is coated with polyethylene glycol, and then is placed and dried to obtain film forming yarn; and S4, the film forming yarn obtained in step S3 is subjected to oiling treatment to obtain the dustproof industrial yarn. The dustproof industrial yarn has good conductive effect, and also has good antistatic, conductive and external insulation effects.

Description

Technical Field

[0001] This application relates to the field of industrial filament technology, and more specifically, to a dustproof industrial filament and a method for preparing the same. Background Technology

[0002] In traditional technology, industrial fibers are widely used in skeleton materials because their properties can be adjusted according to actual usage. With the widespread adoption of industrial fibers, they are gradually being used in high-precision instruments. However, due to their chemical fiber material, industrial fibers generate static electricity during use, attracting dust to their surface. If the dust is not removed in time, it may affect the accuracy of high-precision instruments. Summary of the Invention

[0003] To address the problem that dust can affect the performance of yarns in related technologies, this application provides a dustproof industrial yarn and its preparation method.

[0004] In a first aspect, this application provides a method for preparing dustproof industrial yarn, comprising the following steps:

[0005] S1. Polyester chips are extruded and melted to form a spinning melt, and carbon fibers are added. Then, the fibers are metered, spun, and cooled to form a filament bundle.

[0006] S2. The filament bundles obtained in step S1 are subjected to heat setting, networking, and film forming processes in sequence, and then wound into shape to obtain primary filaments.

[0007] S3. After coating the primary filaments obtained in step S2 with polyethylene glycol, let them stand and dry to obtain film-forming filaments.

[0008] S4. Apply oil to the film-forming filaments obtained in step S3 to obtain dustproof industrial filaments.

[0009] This application effectively improves the electrical conductivity of the dustproof industrial yarn by adding carbon fiber to the polyester melt. At the same time, this application effectively ensures that the dustproof industrial yarn has a good dustproof effect by using film-forming treatment, polyethylene glycol coating and oiling treatment.

[0010] Preferably, the mass fraction of carbon fiber in the tow is 10-20%.

[0011] By limiting the carbon fiber content in the filament bundle, this application can effectively ensure the connection status of the filament bundle, ensuring a high connection effect while avoiding poor physical properties of the filament bundle due to excessive carbon fiber content.

[0012] Preferably, the treatment agent for the film-forming treatment is an aqueous solution of water glass.

[0013] This application utilizes a water glass aqueous solution to treat the fiber bundle, which can form a silica gel on the surface of the fiber bundle, block the capillaries on the surface of the fiber bundle, and effectively improve the physical properties of the fiber bundle.

[0014] Preferably, the mass fraction of sodium silicate in the water glass solution is 20-40%.

[0015] This application specifies that the mass fraction of sodium silicate in the water glass solution can effectively ensure the formation of a stable silica gel during the film-forming process.

[0016] Preferably, the film-forming treatment in the dustproof industrial yarn includes the following steps: immersing the network-treated yarn bundle in a water glass solution, drying it, and winding it into shape to obtain a primary yarn.

[0017] The present application adopts the above-mentioned technical solution, which mixes the wire bundle with the aqueous solution of water glass, soaks it and dries it, which can evaporate the aqueous solution of water glass, promote the aggregation of silicate anions in it into a film, and the Si-OH bond in the film can generate Si-O-Si bond, effectively improving the physical properties of the wire bundle.

[0018] Preferably, the primary filament is composed of a filament bundle and a water glass membrane covering the filament bundle, wherein the mass fraction of the water glass membrane in the primary filament is 5-15%.

[0019] This application specifies that the mass fraction of water glass film in the primary filament can avoid insufficient filament elongation caused by excessive water glass film content, while also avoiding insufficient water glass film content that cannot effectively improve filament performance.

[0020] Preferably, the weight-average molecular weight of the polyethylene glycol is 900-1100 g / mol.

[0021] This application specifies that the weight-average molecular weight of the polyethylene glycol can effectively ensure that the polyethylene glycol is in a liquid state at a relatively low temperature, which is convenient for coating onto the filament bundle, while avoiding damage to the filament bundle caused by excessively high temperature during the coating process.

[0022] Preferably, the film-forming filament is composed of a primary filament and a polyethylene glycol film covering the primary filament, wherein the mass fraction of the polyethylene glycol film in the film-forming filament is 2-8%.

[0023] This application specifies that the mass fraction of polyethylene glycol film in the film-forming filament is sufficient to ensure that the film-forming filament has high antistatic properties.

[0024] Preferably, the oil used for the oiling treatment is water-soluble polydimethyl silicone oil.

[0025] This application specifies that the oil used for the oiling treatment is water-soluble polydimethyl silicone oil, which enables the dustproof industrial filament to have a high external insulation effect.

[0026] Secondly, the present invention provides a dustproof industrial yarn, which is prepared by the preparation method described in the foregoing scheme.

[0027] The dustproof industrial yarn provided in this application has good dustproof effect and conductivity, and at the same time, it has good electrical shielding effect.

[0028] In summary, this application has the following beneficial effects:

[0029] 1. This application adds carbon fiber to the spinning melt, so that the final dustproof industrial yarn has good electrical conductivity, which can ensure the conductivity of the dustproof industrial yarn during use.

[0030] 2. This application forms a hydrogel film on the surface of the filament bundle through film-forming treatment, which effectively increases the density of the dustproof industrial filament and gives it better physical properties.

[0031] 3. In this application, polyethylene glycol is coated on the surface of the hydrogel film on the surface of the filament bundle. Polyethylene glycol has good antistatic properties, which can effectively prevent dust from adhering to the surface of the dustproof industrial filament.

[0032] 4. This application applies an oiling treatment to the surface of the polyethylene glycol film, wherein the oiling agent is water-soluble polydimethyl silicone oil. This limitation ensures that the dustproof industrial yarn has a good external insulation effect and further improves the antistatic effect of the dustproof industrial yarn. Detailed Implementation

[0033] This application provides a method for preparing dustproof industrial yarn, comprising the following steps:

[0034] S1. Polyester chips are extruded and melted to form a spinning melt, and carbon fibers are added. Then, the fibers are metered, spun, and cooled to form a filament bundle.

[0035] S2. The filament bundles obtained in step S1 are subjected to heat setting, networking, and film forming processes in sequence, and then wound into shape to obtain primary filaments.

[0036] S3. After coating the primary filaments obtained in step S2 with polyethylene glycol, let them stand and dry to obtain film-forming filaments.

[0037] S4. Apply oil to the film-forming filaments obtained in step S3 to obtain dustproof industrial filaments.

[0038] Unless otherwise specified in this application, the extrusion melting, spinning, heat setting, web processing, coating, oiling, winding and forming, and coating processes can be performed using methods well known to those skilled in the art.

[0039] In a specific embodiment of this application, step S1 specifically includes the following steps: adding polyester chips to a screw press, extruding and melting them to form a spinning melt, adding a predetermined amount of carbon fiber to the spinning melt, metering the spinning melt with a metering pump, filtering it with a filtration system, and then extruding it from a spinneret, which is cooled by side blowing to form a filament bundle; wherein, the spinneret is a heterodyne spinneret, and the temperatures of each zone of the screw are respectively: 280℃, 290℃, 285℃, 287℃, 289℃, 290℃; the metering pump speed is 15 r / min; and the temperature of the slow cooling zone is 320℃.

[0040] In a specific embodiment of this application, step S2 specifically includes the following steps: the fiber bundle obtained in step S1 is subjected to two-stage drawing and one-stage relaxation heat setting; the drawn and heat-set fibers are then subjected to network processing and film formation treatment, and wound into shape; the first-stage draw ratio is 4.1, the drawing temperature is 120°C; the second-stage draw ratio is 1.5, the drawing temperature is 170°C; the relaxation temperature is 95°C, the total relaxation ratio is 3.5%; and the network pressure is 0.30 MPa.

[0041] In a specific embodiment of this application, the temperature for static drying in step S3 is preferably room temperature, more preferably 25-30°C, and even more preferably 28°C, and the static drying time is preferably 24-48 hours, and even more preferably 36 hours.

[0042] In a specific embodiment of this application, the first oil pump speed in step S4 is 30 r / min, the second oil pump speed is 30 r / min, and the oiling rate is 0.4 wt%. The winding and forming adopts a twin-type winding machine with a winding speed of 2500 m / min and a winding tension of 670 cN.

[0043] This application, by defining the specific preparation method of the dustproof industrial filament, can effectively ensure that the dustproof industrial filament has high physical properties, and at the same time ensure that the water glass film and polyethylene glycol film are stably bonded to the filament bundle.

[0044] In a specific embodiment of this application, the polyester chips preferably undergo pretreatment before extrusion and melting. The pretreatment preferably includes the following steps: sequentially repolymerizing, granulating, and thickening the polyester chips to obtain pretreated polyester chips. This application improves the strength of the polyester chips by pretreating the virgin polyester through repolymerization, granulation, and thickening, thereby increasing the strength of the dust-proof industrial yarn.

[0045] In this application, the mass fraction of carbon fiber in the tow is preferably 10-20%; more preferably 15%.

[0046] By limiting the carbon fiber content in the filament bundle, this application can effectively ensure the connection status of the filament bundle, ensuring a high connection effect while avoiding poor physical properties of the filament bundle due to excessive carbon fiber content.

[0047] In this application, the treatment agent for the film-forming treatment is preferably an aqueous solution of water glass.

[0048] This application utilizes a water glass aqueous solution to treat the fiber bundle, which can form a silica gel on the surface of the fiber bundle, block the capillaries on the surface of the fiber bundle, and effectively improve the physical properties of the fiber bundle.

[0049] In this application, the mass fraction of sodium silicate in the water glass solution is preferably 20-40%, more preferably 30%.

[0050] This application specifies that the mass fraction of sodium silicate in the water glass solution can effectively ensure the formation of a stable silica gel during the film-forming process.

[0051] In this application, the film-forming treatment of the dustproof industrial yarn preferably includes the following steps: immersing the network-treated yarn bundle in a water glass solution, drying it, and winding it into shape to obtain a primary yarn.

[0052] The present application adopts the above-mentioned technical solution, which mixes the wire bundle with the aqueous solution of water glass, soaks it and dries it, which can evaporate the aqueous solution of water glass, promote the aggregation of silicate anions in it into a film, and the Si-OH bond in the film can generate Si-O-Si bond, effectively improving the physical properties of the wire bundle.

[0053] In this application, the primary filament is composed of a filament bundle and a water glass membrane covering the filament bundle, wherein the mass fraction of the water glass membrane in the primary filament is 5-15%, more preferably 10%.

[0054] This application specifies that the mass fraction of water glass film in the primary filament can avoid insufficient filament elongation caused by excessive water glass film content, while also avoiding insufficient water glass film content that cannot effectively improve filament performance.

[0055] In this application, the weight-average molecular weight of the polyethylene glycol is preferably 900-1100 g / mol; more preferably 1000 g / mol.

[0056] This application specifies that the weight-average molecular weight of the polyethylene glycol can effectively ensure that the polyethylene glycol can be in a liquid state at a relatively low temperature, which is convenient for coating onto the filament bundle, while avoiding damage to the filament bundle caused by excessively high temperature during the coating process.

[0057] In this application, the film-forming filament is composed of a primary filament and a polyethylene glycol film covering the primary filament, and the mass fraction of the polyethylene glycol film in the film-forming filament is preferably 2-8%, more preferably 5%.

[0058] This application specifies that the mass fraction of polyethylene glycol film in the film-forming filament is sufficient to ensure that the film-forming filament has high antistatic properties.

[0059] In this application, the oiling agent used for the oiling treatment is preferably water-soluble polydimethyl silicone oil.

[0060] This application specifies that the oil used for the oiling treatment is water-soluble polydimethyl silicone oil, which enables the dustproof industrial filament to have a high external insulation effect.

[0061] This application also provides a dustproof industrial yarn, which is prepared by the aforementioned preparation method.

[0062] The present application will be further described in detail below with reference to the embodiments.

[0063] Preparation examples of raw materials and / or intermediates

[0064] Example

[0065] Example 1

[0066] The preparation method of dustproof industrial yarn includes the following steps:

[0067] S1. Polyester chips are sequentially repolymerized, granulated, and thickened before being added to a screw press. The chips are extruded and melted to form a spinning melt. Carbon fibers are added to the spinning melt, with the carbon fibers accounting for 15% of the melt's mass. The spinning melt is metered by a metering pump, filtered by a filtration system, and then extruded through a spinneret. It is cooled by side-blowing air to form a filament bundle. The spinneret is a heterodyne spinneret. The temperatures in each zone of the screw are: 280℃, 290℃, 285℃, 287℃, 289℃, and 290℃, respectively. The metering pump speed is 15 r / min, and the slow cooling zone temperature is 320℃.

[0068] S2. The filament bundle obtained in step S1 is subjected to two-stage drawing and one-stage relaxation heat setting. The first-stage drawing ratio is 4.1, and the drawing temperature is 120℃; the second-stage drawing ratio is 1.5, and the drawing temperature is 170℃; the relaxation temperature is 95℃, and the total relaxation ratio is 3.5%; the network pressure is 0.30 MPa. Then, the filament bundle is immersed in a water glass solution and dried. The water glass solution contains 30% sodium silicate by mass, and the immersion time is 60 min. Then, the immersed filament bundle is wound into shape to obtain a primary filament. The primary filament contains 10% water glass film by mass. The winding and shaping is preferably carried out using a twin-type winding machine with a winding speed of 2500 m / min and a winding tension of 670 cN.

[0069] S3. After coating the primary filament obtained in step S2 with polyethylene glycol with a weight-average molecular weight of 1000 g / mol, let it stand and dry to obtain a film-forming filament. The standing and drying time is 36 h and the temperature is 28 ° C. The mass fraction of polyethylene glycol film in the film-forming filament is 5%.

[0070] S4. Apply oil to the film-forming filaments obtained in step S3. The first oil pump speed is 30 r / min, the second oil pump speed is 30 r / min, the oil application rate is 0.4 wt%, and the oil used in the oiling process is water-soluble polydimethyl silicone oil to obtain dustproof industrial filaments.

[0071] Example 2

[0072] The difference between Example 2 and Example 1 is that 15% of the carbon fiber in Example 1 is replaced with 10% of the carbon fiber.

[0073] Example 3

[0074] The difference between Example 3 and Example 1 is that 15% of the carbon fiber in Example 1 is replaced with 20% carbon fiber.

[0075] Example 4

[0076] The difference between Example 4 and Example 1 is that 15% of the carbon fiber in Example 1 is replaced with 30% of the carbon fiber.

[0077] Performance testing

[0078] The tensile properties of the dustproof industrial yarns described in Examples 1-4 were tested, and the test results are shown in Table 1.

[0079] Table 1. Tensile properties of the dustproof industrial yarns described in Examples 1-4

[0080] project Elongation at break / % Fracture strength / cN / dtex Example 1 18 8.30 Example 2 19 7.90 Example 3 16 8.15 Example 4 13 8.00

[0081] As can be seen from Examples 1-4 and Table 1, the dustproof industrial yarn described in Example 1 has both high tensile strength and high breaking elongation. Increasing the amount of carbon fiber to 20% can improve the tensile strength of the dustproof industrial yarn, but it will reduce its tensile strength. Increasing the amount of carbon fiber to 30% will significantly reduce both the tensile strength and breaking elongation. This is because when the dustproof industrial yarn is stretched, the yarn body deforms first. When the joint between the dustproof industrial yarn and the carbon fiber is damaged, the yarn body will break directly. Therefore, the dustproof industrial yarn described in Examples 1-3 has better performance, and the tensile performance of Example 1 is even better.

[0082] Example 5

[0083] The difference between Example 5 and Example 1 is that the mass fraction of water glass membrane in the primary wire in Example 1 is replaced with 5%, instead of 10%.

[0084] Example 6

[0085] The difference between Example 6 and Example 1 is that the mass fraction of water glass membrane in the primary filament in Example 1 is replaced with 15%, instead of 10%.

[0086] Example 7

[0087] The difference between Example 7 and Example 1 is that the mass fraction of water glass membrane in the primary wire in Example 1 is replaced with 20%, instead of 10%.

[0088] Example 8

[0089] The difference between Example 8 and Example 1 is that the mass fraction of polyethylene glycol film in the film-forming filament in Example 1 is replaced with 2%, instead of 5%.

[0090] Example 9

[0091] The difference between Example 9 and Example 1 is that the mass fraction of polyethylene glycol film in the film-forming filament in Example 1 is replaced by 8%, instead of 5%.

[0092] Example 10

[0093] The difference between Example 10 and Example 1 is that the mass fraction of polyethylene glycol film in the film-forming filament in Example 1 is replaced by 15% instead of 5%.

[0094] Performance testing

[0095] The morphology of the dustproof industrial yarns of Examples 1 and 5-10 was observed, and dustproof and antistatic tests were conducted. The observation results are shown in Table 2. The dustproof test procedure was as follows: After the dustproof industrial yarns of Examples 1 and 5-10 were left to stand indoors for 24 hours, the yarns were cleaned with an air gun for 20 seconds. The dust adsorbed on the surface of the yarns was observed to see if it was completely removed. The test result of complete dust removal was recorded as dustproof, and the test result of incomplete dust removal was recorded as non-dustproof. The antistatic test procedure was as follows: The dustproof industrial yarns of Examples 1 and 5-10 were dry-rubbed 10 times with a lint-free cloth and then brought close to shredded paper. The surface of the dustproof industrial yarns was observed to see if shredded paper was adsorbed. No paper adsorbed was recorded as antistatic, and paper adsorbed was recorded as non-antistatic.

[0096] Table 2. Morphology, dustproofing, and antistatic test results of the dustproof industrial yarns in Examples 1 and 5-10.

[0097]

[0098] As can be seen from Examples 1 and 5-10 and Table 2, the bonding effect between the filaments and the multi-gel layer in Examples 7 and 10 is poor, and the gel is easy to fall off from the filament bundle, which results in the filaments not having the effect of dustproofing and antistatic properties. In Examples 1, 5-6 and 8-9, the filaments are tightly bonded to the multi-gel layer and have good dustproofing and antistatic properties.

[0099] This specific embodiment is merely an explanation of this application and is not intended to limit it. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they fall within the scope of the claims of this application.

Claims

1. A process for the production of a dustproof industrial yarn, characterized in that, The method comprises the following steps: S1, forming a spinning melt by extruding and melting polyester chips and adding carbon fibers, and then metering and spinning cooling to form a tow; S2, sequentially performing heat setting treatment and network treatment on the tow obtained in step S1, immersing the network treated tow in a water glass solution, drying, winding and forming to obtain a primary filament; S3, coating the primary filament obtained in step S2 with polyethylene glycol, and then standing and drying to obtain a film-forming filament; S4, performing oiling treatment on the film-forming filament obtained in step S3 to obtain a dust-proof industrial filament; The film-forming filament is composed of a primary filament and a polyethylene glycol film coated on the primary filament, the mass fraction of the polyethylene glycol film in the film-forming filament is 2-8%, and the weight average molecular weight of the polyethylene glycol is 900-1100 g / mol; The mass fraction of the carbon fibers in the tow is 15%; The mass fraction of sodium silicate in the water glass solution is 20-40%; The primary filament is composed of a tow and a water glass film coated on the tow, and the mass fraction of the water glass film in the primary filament is 5-15%.

2. The production method according to claim 1, characterized by, The oil agent for the oiling treatment is water-soluble polydimethylsiloxane.

3. A dustproof industrial thread, characterized by, The method is prepared by any one of claims 1-2.

Images