Preparation method of antistatic polyester sewing thread

Abstract

The invention relates to the technical field of antistatic polyester sewing threads, and discloses a preparation method of an antistatic polyester sewing thread, which comprises the steps of raw material preparation, drying and pre-crystallization treatment, antistatic color master batch preparation, mixed spinning, antistatic pigment treatment, secondary antistatic treatment and subsequent treatment. By means of the preparation method, comprehensive antistatic effects can be provided in different spinning stages during preparation of the polyester sewing thread, and therefore it is guaranteed that the polyester sewing thread has the excellent antistatic performance.

Description

Technical Field

[0001] The invention belongs to the technical field of processing antistatic polyester sewing thread, and specifically relates to a preparation method of the antistatic polyester sewing thread. Background Art

[0002] PET materials are widely used in sewing thread manufacturing due to their excellent physical and chemical properties. However, PET materials are prone to static electricity under friction or dry conditions, which not only affects the smooth progress of the sewing process, such as causing thread adhesion and thread breakage, thereby reducing sewing efficiency, but may also cause damage to sensitive electronic components, especially in the sewing process of electronic products or in flammable and explosive environments. The presence of static electricity may cause safety hazards. Therefore, it is crucial that sewing threads made of PET have anti-static function.

[0003] From the perspective of product quality, anti-static sewing thread can keep the sewing seams straight and beautiful, and improve the overall quality of the product. Especially in the fields of high-end clothing, electronic product packaging, etc., there are higher requirements for the anti-static performance of sewing thread. Therefore, we propose a method for preparing antistatic polyester sewing thread. Summary of the invention

[0004] The purpose of the present invention is to provide a method for preparing an antistatic polyester sewing thread in order to provide a comprehensive antistatic effect in different spinning stages, thereby ensuring that the polyester sewing thread has excellent antistatic performance.

[0005] The technical solution adopted by the present invention is as follows: A method for preparing an antistatic polyester sewing thread, the preparation method comprising: S1: Raw material preparation, including PET chips, masterbatch base material, nonionic antistatic agent, cationic antistatic agent, quaternary ammonium salt antistatic agent, dispersant, pigment, antioxidant, flame retardant and mineral oil; S2: Drying and pre-crystallization treatment, heating the PET slices to a temperature slightly below their melting point to ensure that the slices do not melt completely, but begin to form a crystalline structure. During the heating process, a stirring device or a fluidized bed is used to keep the slice particles moving to prevent adhesion between the slice particles, ensuring that each particle can be evenly heated and crystallized. After the pre-crystallization treatment is completed, the slices are sent to the drying tower for further drying to remove moisture from the slices. S3: Preparation of antistatic masterbatch: the masterbatch base material, nonionic antistatic agent, cationic antistatic agent, quaternary ammonium salt antistatic agent, dispersant, antioxidant, flame retardant and mineral oil are mixed and stirred evenly. The mixed raw materials are sent to the extruder. Under the action of high temperature and high pressure, the raw materials are plasticized into continuous strip materials. The plasticized strip materials need to be cooled by a cooling device. The cooled strip materials are cut into granules by a pelletizer to obtain antistatic masterbatch; S4: Mixed spinning: the pretreated PET chips are mixed with the antistatic masterbatch and melted at high temperature. The molten mixture is spun into filaments through a spinning assembly and cooled to solidify. S5: Antistatic pigment treatment: put the pigment, nonionic antistatic agent, cationic antistatic agent and quaternary ammonium salt antistatic agent into a stirring device or a disperser for full stirring to ensure that the antistatic agent and pigment are evenly distributed in the solvent to form a stable antistatic pigment solution. The prepared antistatic pigment solution is filtered and degassed so that the antistatic agent and pigment are evenly attached to the fiber surface or inside, thereby giving the fiber lasting antistatic properties and good coloring effect. S6: Secondary antistatic treatment, after stretching and twisting the spun silk thread, soak the spun silk thread in an antistatic agent solution to ensure that the silk thread can fully absorb the antistatic agent. After the soaking is completed, take out the spun silk thread and dry it; S7: Subsequent processing: the dried silk thread is wound into shape to make a semi-finished product, and then the semi-finished product is further stretched and twisted to make the final antistatic polyester sewing thread.

[0006] In a preferred embodiment of the invention, the mixing ratio of the antistatic masterbatch is: 50% to 72% masterbatch base material, 5% to 8% nonionic antistatic agent, 5% to 8% cationic antistatic agent, 6% to 9% quaternary ammonium salt antistatic agent, 7% to 15% dispersant, 4% to 6% antioxidant, 3% to 7% flame retardant, and 4% to 8% mineral oil.

[0007] In a preferred embodiment of the invention, the mixing ratio of the antistatic pigment is: 50% to 80% pigment, 6% to 9% nonionic antistatic agent, 6% to 9% cationic antistatic agent, and 5% to 9% quaternary ammonium salt antistatic agent.

[0008] In a preferred embodiment of the invention, the inorganic composite wall material is made in the following mixing ratios: 50%-70% silicon dioxide, 10%-30% aluminum oxide, and 5%-20% titanium dioxide.

[0009] In a preferred embodiment of the invention, the filtration can remove impurities and undissolved particles in the solution to ensure the smooth progress of the spinning process, and the degassing can remove bubbles in the solution to avoid broken wires or defects in the spinning process.

[0010] In a preferred embodiment of the invention, the dispersant is any one of polyethylene wax, EVA wax and zinc stearate.

[0011] In a preferred embodiment of the invention, the antioxidant is any one of hindered phenols, phosphites and thiols.

[0012] In a preferred embodiment of the invention, the flame retardant is any one of a halogen-based, a phosphorus-based and a nitrogen-based flame retardant.

[0013] In a preferred embodiment of the invention, the mineral oil is white oil.

[0014] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are: 1. In the present invention, the antistatic masterbatch can provide antistatic function for polyester fiber in the early stage of spinning. It can be used together with PET chips to prepare special filaments for polyester sewing thread with antistatic performance, which can effectively reduce the volume resistance of the material, thereby reducing the generation and accumulation of static electricity during the spinning process; and the application of antistatic pigments can further enhance the antistatic effect of polyester sewing thread in the spinning or subsequent processing stage, and can form an antistatic layer on the fiber surface to accelerate the dissipation of charge, thereby avoiding the accumulation of static electricity; antistatic masterbatch and antistatic pigments are used to provide comprehensive antistatic effects in different spinning stages in the preparation of polyester sewing thread, thereby ensuring that the polyester sewing thread has excellent antistatic performance.

[0015] 2. In the present invention, when preparing antistatic masterbatch and antistatic pigment, the added nonionic antistatic agent mainly exerts its effect through the hydrophilic group and lipophilic group in its molecule. When added to the material, the lipophilic group adsorbs to the material, while the hydrophilic group faces the surface of the material; in a humid environment, the hydrophilic group adsorbs moisture in the air, thereby forming a thin conductive layer on the surface of the material; this conductive layer can conduct static charge and reduce the resistance of the material surface, thereby preventing static electricity accumulation and ensuring that the polyester sewing thread has excellent antistatic properties.

[0016] 3. In the present invention, when preparing antistatic masterbatch and antistatic pigment, the added cationic antistatic agent will be ionized inside or on the surface of the material, and the generated cations can move in the material. When static electricity is generated, these mobile cations can conduct static charge and neutralize the charge, thereby avoiding the accumulation of static electricity and ensuring that the polyester sewing thread has excellent antistatic properties.

[0017] 3. In the present invention, when preparing antistatic masterbatch and antistatic pigment, the added quaternary ammonium salt antistatic agent has extremely strong adsorption capacity and can easily form a lipophilic film on the surface of the substrate, which can not only reduce the static friction coefficient of the fiber surface, make the fiber have good smoothness, and make the cationic effect further enhance the antistatic effect, but also the quaternary ammonium salt ions can move under the action of the electric field and transfer the static charge to the surrounding environment, thereby avoiding the accumulation of static electricity and ensuring that the polyester sewing thread has excellent antistatic properties. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a flow chart of the preparation method of the present invention. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in combination with the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0020] The following will be combined Figure 1 A method for preparing an antistatic polyester sewing thread according to an embodiment of the present invention is described in detail. Example

[0021] Reference Figure 1 , a preparation method of antistatic polyester sewing thread, the preparation method is: raw material preparation, preparing PET chips, masterbatch substrate, nonionic antistatic agent, cationic antistatic agent, quaternary ammonium salt antistatic agent, dispersant, pigment, antioxidant, flame retardant and mineral oil; the dispersant is any one of polyethylene wax, EVA wax and zinc stearate; the antioxidant is any one of hindered phenols, phosphites and thiols; the flame retardant is any one of halogen, phosphorus and nitrogen; the mineral oil is white oil; drying and pre-crystallization treatment, heating the PET chips to a temperature slightly lower than its melting point, ensuring The slices will not melt completely, but begin to form a crystalline structure. During the heating process, a stirring device or a fluidized bed is used to keep the slice particles moving to prevent adhesion between the slice particles, ensuring that each particle can be evenly heated and form crystals. After the pre-crystallization treatment is completed, the slices are sent to a drying tower for further drying to remove moisture from the slices. Specifically, the pre-crystallization treatment can prevent the polyester slices from sticking together during subsequent processing. Through the pre-crystallization treatment, the crystallinity of the polyester slices is further improved, and the hardness is increased, which helps to improve the physical properties of the polyester sewing thread.

[0022] Reference Figure 1 , preparation of antistatic masterbatch, mixing the masterbatch base material, nonionic antistatic agent, cationic antistatic agent, quaternary ammonium salt antistatic agent, dispersant, antioxidant, flame retardant and mineral oil evenly, the mixed raw materials are sent to the extruder, under the action of high temperature and high pressure, the raw materials are plasticized into continuous strip materials, the plasticized strip materials need to be cooled by a cooling device, the cooled strip materials are cut into granules by a pelletizer, and the antistatic masterbatch is obtained; mixed spinning, the pretreated PET chips are mixed with the antistatic masterbatch, and melted at high temperature, the molten mixture is spun into filaments through a spinning assembly, and cooled and solidified; specifically, the antistatic masterbatch can provide antistatic function for polyester fiber at the early stage of spinning, and it can be used together with PET chips to prepare special filaments for polyester sewing thread with antistatic properties, which can effectively reduce the volume resistance of the material, thereby reducing the generation and accumulation of static electricity during the spinning process, ensuring that the polyester sewing thread has excellent antistatic properties.

[0023] Reference Figure 1 , antistatic pigment treatment, put the pigment, nonionic antistatic agent, cationic antistatic agent and quaternary ammonium salt antistatic agent into a stirring device or disperser for full stirring to ensure that the antistatic agent and pigment are evenly distributed in the solvent to form a stable antistatic pigment solution, filter and deaerate the prepared antistatic pigment solution so that the antistatic agent and pigment are evenly attached to the fiber surface or inside, thereby giving the fiber lasting antistatic properties and good coloring effect; filtration can remove impurities and undissolved particles in the solution to ensure the smooth spinning process, and deaeration can remove bubbles in the solution to avoid broken wires or defects during the spinning process; secondary antistatic treatment, after the spun silk thread is stretched and twisted, The spinning thread is immersed in an antistatic agent solution to ensure that the wire can fully absorb the antistatic agent. After the immersion is completed, the spinning thread is taken out and dried; in the subsequent treatment, the dried silk thread is wound and formed into a semi-finished product, and then the semi-finished product is further stretched and twisted to make the final antistatic polyester sewing thread; specifically, the application of antistatic pigments can further enhance the antistatic effect of polyester sewing thread in the spinning or subsequent processing stage, and can form an antistatic layer on the fiber surface to accelerate the dissipation of charge, thereby avoiding the accumulation of static electricity; antistatic masterbatch and antistatic pigments are used to provide comprehensive antistatic effects in different spinning stages in the preparation of polyester sewing thread, thereby ensuring that the polyester sewing thread has excellent antistatic properties.

[0024] Reference Figure 1, the mixing ratio of antistatic masterbatch is: masterbatch base material 50%~72%, nonionic antistatic agent 5%~8%, cationic antistatic agent 5%~8%, quaternary ammonium salt antistatic agent 6%~9%, dispersant 7%~15%, antioxidant 4%~6%, flame retardant 3%~7%, mineral oil 4%~8%; the mixing ratio of antistatic pigment is: pigment 50%~80%, nonionic antistatic agent 6%~9%, cationic antistatic agent 6%~9%, quaternary ammonium salt antistatic agent 5%~9%; specifically, when preparing antistatic masterbatch and antistatic pigment, the added nonionic antistatic agent mainly plays a role through the hydrophilic group and lipophilic group in its molecule. When added to the material, the lipophilic group is adsorbed with the material, while the hydrophilic group is toward the surface of the material; in a humid environment, the hydrophilic group will adsorb the air moisture, thus forming a thin conductive layer on the surface of the material; this conductive layer can conduct static charge, reduce the resistance of the material surface, and thus prevent static electricity accumulation; the added cationic antistatic agent will be ionized inside or on the surface of the material, and the generated cations can move in the material. When static electricity is generated, these mobile cations can conduct static charge and neutralize the charge; at the same time, the added quaternary ammonium salt antistatic agent has a very strong adsorption capacity and is easy to form a lipophilic film on the surface of the substrate, which can not only reduce the static friction coefficient of the fiber surface, make the fiber have good smoothness, and make the cationic effect further enhance the antistatic effect, but also the quaternary ammonium salt ions can move under the action of the electric field, and transfer the static charge to the surrounding environment, thereby avoiding the accumulation of static electricity, thereby ensuring that the polyester sewing thread has excellent antistatic properties.

[0025] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0026] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for preparing an antistatic polyester sewing thread, characterized in that: The preparation method is: S1: Raw material preparation, including PET chips, masterbatch base material, nonionic antistatic agent, cationic antistatic agent, quaternary ammonium salt antistatic agent, dispersant, pigment, antioxidant, flame retardant and mineral oil; S2: Drying and pre-crystallization treatment, heating the PET slices to a temperature slightly below their melting point to ensure that the slices do not melt completely, but begin to form a crystalline structure. During the heating process, a stirring device or a fluidized bed is used to keep the slice particles moving to prevent adhesion between the slice particles, ensuring that each particle can be evenly heated and crystallized. After the pre-crystallization treatment is completed, the slices are sent to the drying tower for further drying to remove moisture from the slices. S3: Preparation of antistatic masterbatch: the masterbatch base material, nonionic antistatic agent, cationic antistatic agent, quaternary ammonium salt antistatic agent, dispersant, antioxidant, flame retardant and mineral oil are mixed and stirred evenly. The mixed raw materials are sent to the extruder. Under the action of high temperature and high pressure, the raw materials are plasticized into continuous strip materials. The plasticized strip materials need to be cooled by a cooling device. The cooled strip materials are cut into granules by a pelletizer to obtain antistatic masterbatch; S4: Mixed spinning: the pretreated PET chips are mixed with the antistatic masterbatch and melted at high temperature. The molten mixture is spun into filaments through a spinning assembly and cooled to solidify. S5: Antistatic pigment treatment: put the pigment, nonionic antistatic agent, cationic antistatic agent and quaternary ammonium salt antistatic agent into a stirring device or a disperser for full stirring to ensure that the antistatic agent and pigment are evenly distributed in the solvent to form a stable antistatic pigment solution. The prepared antistatic pigment solution is filtered and degassed so that the antistatic agent and pigment are evenly attached to the fiber surface or inside, thereby giving the fiber lasting antistatic properties and good coloring effect. S6: Secondary antistatic treatment, after stretching and twisting the spun silk thread, soak the spun silk thread in an antistatic agent solution to ensure that the silk thread can fully absorb the antistatic agent. After the soaking is completed, take out the spun silk thread and dry it; S7: Subsequent processing: the dried silk thread is wound into shape to make a semi-finished product, and then the semi-finished product is further stretched and twisted to make the final antistatic polyester sewing thread.

2. The method for preparing an antistatic polyester sewing thread according to claim 1, characterized in that: The mixing ratio of the antistatic masterbatch is: 50% to 72% of masterbatch base material, 5% to 8% of nonionic antistatic agent, 5% to 8% of cationic antistatic agent, 6% to 9% of quaternary ammonium salt antistatic agent, 7% to 15% of dispersant, 4% to 6% of antioxidant, 3% to 7% of flame retardant, and 4% to 8% of mineral oil.

3. The method for preparing an antistatic polyester sewing thread according to claim 1, characterized in that: The mixing ratio of the antistatic pigment is: 50% to 80% pigment, 6% to 9% nonionic antistatic agent, 6% to 9% cationic antistatic agent, and 5% to 9% quaternary ammonium salt antistatic agent.

4. The method for preparing an antistatic polyester sewing thread according to claim 1, characterized in that: The filtration can remove impurities and undissolved particles in the solution to ensure the smooth progress of the spinning process, and the degassing can remove bubbles in the solution to avoid broken wires or defects in the spinning process.

5. The method for preparing an antistatic polyester sewing thread according to claim 1, characterized in that: The dispersant is any one of polyethylene wax, EVA wax and zinc stearate.

6. The method for preparing an antistatic polyester sewing thread according to claim 1, characterized in that: The antioxidant is any one of hindered phenols, phosphites and thiols.

7. The method for preparing an antistatic polyester sewing thread according to claim 1, characterized in that: The flame retardant is any one of halogen, phosphorus and nitrogen.

8. The method for preparing an antistatic polyester sewing thread according to claim 1, characterized in that: The mineral oil is white oil.

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