Preparation method of semi-dull polyester low stretch yarn

Abstract

The invention relates to the technical field of low stretch yarn, in particular to a semi-dull polyester low stretch yarn preparation method which sequentially comprises the following steps: raw materials of semi-dull polyester low stretch yarn comprise organic silicon polyester chips, flaky mica, aluminum oxide powder, polyoxypropylene and organic silicon polyether silicone oil according to the weight ratio of 1.9: 0.7: 2.0: 2.5: 0.7; the preparation method comprises the following steps: preparing polypropylene, organosilicon polyether silicone oil, polyethylene glycol, dimethyl phthalate and ethylene glycol according to a weight ratio of 0.05: 3.2: 3.5: 3.7: 3.6; the preparation method of the semi-dull polyester low stretch yarn sequentially comprises the following steps: step 1, preparing raw materials; step 2, pretreatment; step 3, spinning; step 4, spinning; and step 5, post-processing.

Description

Technical Field

[0001] The invention relates to the technical field of low-stretch yarns, in particular to a method for preparing semi-dull polyester low-stretch yarns. Background Art

[0002] Polyester fiber, commonly known as "polyester", is a synthetic fiber made by chemical polycondensation of organic dibasic acid and diol. It is a kind of polymer compound. Its invention can be traced back to the 1930s, and it is now the most important type of synthetic fiber.

[0003] Polyester fiber has many advantages. First, it has excellent wrinkle resistance and shape retention. Clothes made from it are not easy to wrinkle during wearing and can maintain their original shape. Secondly, polyester fiber has high strength and elastic recovery ability, making the woven fabric strong and durable, and can quickly recover to its original shape. In addition, polyester fiber is also resistant to wear and tear and does not stick to hair, making the fabric look neater.

[0004] In addition, the diverse properties of natural fibers make it difficult to develop fiber materials, which in turn limits the development of many products. In order to replace and improve absorbent products mainly made of natural raw materials, various development research projects using synthetic fibers have been carried out since the 1990s; among them, some alternative products of synthetic fibers that are superior to natural raw materials have been developed and put into practical use.

[0005] Among them, the "A kind of cool cotton-feeling polyester low-stretch yarn and its processing technology" disclosed in the application number "CN102383206B" is also an increasingly mature technology. Its "Material preparation: prepare silicone polyester slices, flaky mica, aluminum oxide powder and silicone polyether silicone oil according to a weight ratio of 9.1:0.3:0.13:0.24 respectively, pre-crystallize the above silicone polyester slices, and then solid-phase polymerize them to obtain silicone polyester slices with a viscosity of 1.015 dl / g; wherein the temperature of the above pre-crystallization is controlled at 197-199°C, and the pre-crystallization time is 7-9min; the temperature of the above solid-phase polymerization is controlled at 322-324°C, and the solid-phase polymerization time is maintained at 21-23min; then add the above silicone polyester slices with a viscosity of 1.015 dl / g into a kettle reactor with a stirring roller and a cooling coil built in, and stir and mix them thoroughly, wherein the temperature of the above cooling coil is 19-21°C.

[0006] A special design of a series of low-elastic yarn preparation process steps from pretreatment, spinning, spinning post-treatment and other steps and special optimization of related parameters are provided to form a low-elastic yarn and its processing and preparation process, so as to achieve excellent and unique anti-deformation and low elasticity effects. Summary of the invention

[0007] In view of the shortcomings of the prior art, the present invention provides a method for preparing semi-dull polyester low-elastic yarn, which solves the problems raised in the background technology.

[0008] To achieve the above object, the present invention provides the following technical solution: a method for preparing a semi-dull polyester low-elastic yarn, characterized in that the method for preparing a semi-dull polyester low-elastic yarn comprises the following steps in sequence: The raw materials of the semi-dull polyester low-elastic yarn are silicone polyester slices, flaky mica, aluminum oxide powder, polyoxypropylene and silicone polyether silicone oil in a weight ratio of 1.9:0.7:2.0:2.5:0.7 respectively, and polypropylene, silicone polyether silicone oil, polyethylene glycol, dimethyl phthalate and ethylene glycol are prepared in a weight ratio of 0.05:3.2:3.5:3.7:3.6 respectively; the preparation method of the semi-dull polyester low-elastic yarn comprises the following steps in sequence: Step 1: Prepare raw materials; Step 2: Preprocessing; Step 3: Spinning; Step 4: Spinning; Step 5: Post-processing.

[0009] Step 1: Raw material preparation: prepare silicone polyester chips, flaky mica, alumina powder and silicone polyether silicone oil in a weight ratio of 9.1:0.3:0.13:0.24 respectively; Step 2: Pretreatment: pre-crystallize the above-mentioned silicone polyester slices, alumina powder, and polyethylene glycol, and then perform solid phase polymerization to obtain silicone polyester slices with a viscosity of 1.602~1.71dl / g; wherein the temperature of the above-mentioned pre-crystallization is controlled at 229~231°C, and the pre-crystallization time is 4~8min; the temperature of the above-mentioned solid phase polymerization is controlled at 256~259°C, and the solid phase polymerization time is maintained for 10~13min; then the above-mentioned silicone polyester slices with a viscosity of 1.803l / g are added to a kettle reactor with a stirring roller and a cooling coil built in, and are fully stirred and mixed, wherein the temperature of the above-mentioned cooling coil is 28~35°C; after cooling, they are added to a single-screw extruder, and the single-screw extruder is divided into 3 zones according to the length of the extrusion tube, and the temperatures of the five zones are 126°C, 127°C, 129°C, 131°C, and 140°C, and the screw speed is 279rpm; Spinning: adding amine chain extender and amine reaction control agent uniformly to the 126°C temperature zone in step 3, and then stirring and mixing the obtained polymer melt into the autoclave reactor, and then entering the twin-screw extruder through the quantitative screw silo, and then being metered by a metering pump and sent to the spinning assembly to extrude from the spinneret to form a tow, and the temperature at the extruder outlet is maintained at 200-226°C and heated for 3-8 minutes to melt, and the obtained molten polymer melt is distributed to 2 melt barrels through the melt main pipe, and the temperature of the twin-screw extruder is heated at 300-315°C for 10 minutes to melt; the ejected tow passes through the first hot barrel at a temperature of 100°C, and the second hot barrel is maintained for 20 minutes and the temperature is 150°C, and then metered by a metering pump and extruded from the special-shaped spinneret to form a tow; Step 4 Spinning: The polymer melt after being heated by the second heat drum at 100°C for 10 minutes is cooled and solidified in a blower, enters the spinneret channel, is extruded from the special-shaped spinneret hole, and is passed through the first heat drum at 80°C for 3 minutes, and then cooled and solidified in a blower; Step 5: placing the formed spinned anti-deformation low-elastic yarn in a first steaming drum at a temperature of 30-40° C. for 2 minutes, then placing it in a second steaming drum at a temperature of 40-50° C. for 2 minutes, and then placing it in a third steaming drum at a temperature of 50-60° C. for 2 minutes; Step six post-treatment: the first bleaching liquid is composed of 0.64g / L sodium carbonate, 0.78g / L chelating dispersant, 1.56g / L disodium hydrogen phosphate and water, the second bleaching liquid is composed of 0.73g / L scouring agent, 0.42g / L chelating dispersant, 1.3g / L hydrogen peroxide and water, the third bleaching liquid is composed of 0.23g / L sodium silicate, 3.1g / L disodium hydrogen phosphate, 0.8g / L hydrogen peroxide and water, and the fourth bleaching liquid is composed of 0.98g / L chelating dispersant, 2.03g / L disodium hydrogen phosphate, 1.76g / L hydrogen peroxide and water.

[0010] In step 1, the above-mentioned silicone polyester chips are pre-crystallized and then solid-phase polymerized to obtain silicone polyester chips with a viscosity of 2.7 dl / g.

[0011] In step 3, the temperature is maintained at 240° C. before the twin-screw extruder exit for 20 minutes for melting.

[0012] Compared with the prior art, the present invention has the following beneficial effects: 1. The temperature of semi-dull polyester low-elastic yarn during processing is in different ranges. As the temperature increases, the polymer melt inside the heat cylinder is cooled and solidified in the blower, enters the spinneret channel, and is extruded from the special-shaped spinneret hole. It is cooled and solidified in the blower, and the temperature change affects the effect of the spinneret. 2. The pre-crystallization of the semi-dull polyester low-elastic yarn is determined, and the temperature of the phase polymerization is controlled within a certain range. Then, the above-mentioned viscosity is determined, so that the silicone polyester chips are added to the kettle reactor with a stirring roller and a cooling coil built in, and are fully stirred and mixed. The temperature of the cooling coil is 28-35°C; after cooling, they are added to the single-screw extruder to further cool the spinneret. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the preparation of the present invention. DETAILED DESCRIPTION

[0014] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only 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.

[0015] The terms "first", "second", etc. in the specification and claims of the present application are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable under appropriate circumstances, so that the embodiments of the present application can be implemented in an order other than those illustrated or described here, and the objects distinguished by "first", "second", etc. are generally of one type, and the number of objects is not limited. For example, the first object can be one or more. In addition, "and / or" in the specification and claims represents at least one of the connected objects, and the character " / " generally indicates that the objects associated with each other are in an "or" relationship.

[0016] In the description of the present invention, it is necessary to understand that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0017] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "set" should be understood in a broad sense, for example, they can be fixedly connected or set, or detachably connected or set, or integrally connected or set. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0018] Embodiment 1, as Figure 1As shown, the method for preparing the semi-dull polyester low-elastic yarn proposed by the present invention is characterized in that the method for preparing the semi-dull polyester low-elastic yarn comprises the following steps in sequence: The raw materials of the semi-dull polyester low-elastic yarn are silicone polyester slices, flaky mica, aluminum oxide powder, polyoxypropylene and silicone polyether silicone oil in a weight ratio of 1.9:0.7:2.0:2.5:0.7 respectively, and polypropylene, silicone polyether silicone oil, polyethylene glycol, dimethyl phthalate and ethylene glycol are prepared in a weight ratio of 0.05:3.2:3.5:3.7:3.6 respectively; the preparation method of the semi-dull polyester low-elastic yarn comprises the following steps in sequence: Step 1: Prepare raw materials; Step 2: Preprocessing; Step 3: Spinning; Step 4: Spinning; Step 5: Post-processing.

[0019] Step 1: Raw material preparation: prepare silicone polyester chips, flaky mica, alumina powder and silicone polyether silicone oil in a weight ratio of 9.1:0.3:0.13:0.24 respectively; Step 2: Pretreatment: pre-crystallize the above-mentioned silicone polyester slices, alumina powder and polyethylene glycol, and then perform solid phase polymerization to obtain silicone polyester slices with a viscosity of 1.602 dl / g; wherein the temperature of the above-mentioned pre-crystallization is controlled at 229°C, and the pre-crystallization time is 4 minutes; the temperature of the above-mentioned solid phase polymerization is controlled at 256°C, and the solid phase polymerization time is maintained for 10 minutes; then add the above-mentioned silicone polyester slices with a viscosity of 1.803l / g into a kettle reactor equipped with a stirring roller and a cooling coil, stir and mix them thoroughly, wherein the temperature of the above-mentioned cooling coil is 28°C; after cooling, add them into a single-screw extruder, and the single-screw extruder is divided into 3 zones according to the length of the extrusion tube, and the temperatures of the five zones are 126°C, 127°C, 129°C, 131°C, and 140°C, and the screw speed is 279rpm; Spinning: adding amine chain extender and amine reaction controller uniformly to the 126°C temperature zone in step 3, and then stirring and mixing the obtained polymer melt into the autoclave reactor, and then feeding the obtained polymer melt into the twin-screw extruder through the quantitative screw silo, and then feeding the obtained polymer melt into the spinning assembly through the metering pump, and then extruding the obtained polymer melt from the spinneret to form a tow, and then heating the obtained polymer melt at 200°C for 3 minutes at the outlet of the extruder to melt the polymer melt, and then distributing the obtained polymer melt to two melt barrels through the melt main pipe, and then heating the obtained polymer melt at 300°C for 10 minutes at the extrusion temperature of the twin-screw extruder to melt the polymer melt; the ejected polymer melt respectively passes through the first heat barrel at a temperature of 100°C, and the second heat barrel at a temperature of 150°C for 20 minutes, and then is metered by the metering pump and then extruded from the special-shaped spinneret to form a tow; Step 4 Spinning: The polymer melt after being heated by the second heat drum at 100°C for 10 minutes is cooled and solidified in a blower, enters the spinneret channel, is extruded from the special-shaped spinneret hole, and is passed through the first heat drum at 80°C for 3 minutes, and then cooled and solidified in a blower; Step 5: Place the formed spinning anti-deformation low-elastic yarn in a first steaming drum at a temperature of 30°C for 2 minutes, then place it in a second steaming drum at a temperature of 40°C for 2 minutes, and then place it in a third steaming drum at a temperature of 50-60°C for 2 minutes; Step six post-treatment: the first bleaching liquid is composed of 0.64g / L sodium carbonate, 0.78g / L chelating dispersant, 1.56g / L disodium hydrogen phosphate and water, the second bleaching liquid is composed of 0.73g / L scouring agent, 0.42g / L chelating dispersant, 1.3g / L hydrogen peroxide and water, the third bleaching liquid is composed of 0.23g / L sodium silicate, 3.1g / L disodium hydrogen phosphate, 0.8g / L hydrogen peroxide and water, and the fourth bleaching liquid is composed of 0.98g / L chelating dispersant, 2.03g / L disodium hydrogen phosphate, 1.76g / L hydrogen peroxide and water.

[0020] In step 1, the above-mentioned silicone polyester chips are pre-crystallized and then solid-phase polymerized to obtain silicone polyester chips with a viscosity of 2.7 dl / g.

[0021] In step 3, the temperature is maintained at 240° C. before the twin-screw extruder exit for 20 minutes for melting.

[0022] Embodiment 2, a method for preparing semi-dull polyester low-elastic yarn, characterized in that the method for preparing semi-dull polyester low-elastic yarn comprises the following steps in sequence: The raw materials of the semi-dull polyester low-elastic yarn are silicone polyester slices, flaky mica, aluminum oxide powder, polyoxypropylene and silicone polyether silicone oil in a weight ratio of 1.9:0.7:2.0:2.5:0.7 respectively, and polypropylene, silicone polyether silicone oil, polyethylene glycol, dimethyl phthalate and ethylene glycol are prepared in a weight ratio of 0.05:3.2:3.5:3.7:3.6 respectively; the preparation method of the semi-dull polyester low-elastic yarn comprises the following steps in sequence: Step 1: Prepare raw materials; Step 2: Preprocessing; Step 3: Spinning; Step 4: Spinning; Step 5: Post-processing.

[0023] Step 1: Raw material preparation: prepare silicone polyester chips, flaky mica, alumina powder and silicone polyether silicone oil in a weight ratio of 9.1:0.3:0.13:0.24 respectively; Step 2: Pretreatment: pre-crystallize the above-mentioned silicone polyester slices, alumina powder and polyethylene glycol, and then perform solid phase polymerization to obtain silicone polyester slices with a viscosity of 1.602~1.71dl / g; wherein the temperature of the above-mentioned pre-crystallization is controlled at 230°C, and the pre-crystallization time is 5min; the temperature of the above-mentioned solid phase polymerization is controlled at 266°C, and the solid phase polymerization time is maintained for 12min; then add the above-mentioned silicone polyester slices with a viscosity of 1.803l / g into a kettle reactor equipped with a stirring roller and a cooling coil, stir and mix them thoroughly, wherein the temperature of the above-mentioned cooling coil is 29°C; after cooling, add them into a single-screw extruder, and the single-screw extruder is divided into 3 zones according to the length of the extrusion tube, and the temperatures of the five zones are 126°C, 127°C, 129°C, 131°C, and 140°C, and the screw speed is 279rpm; Spinning: adding amine chain extender and amine reaction controller uniformly to the 126°C temperature zone in step 3, and then stirring and mixing the obtained polymer melt into the kettle reactor, and then entering the twin-screw extruder through the quantitative screw silo, and then being metered by a metering pump and sent to the spinning assembly to extrude from the spinneret to form a tow, and the temperature at the extruder outlet is maintained at 190°C and heated for 4 minutes for melting, and the obtained molten polymer melt is distributed to 2 melt barrels through the melt main pipe, and the temperature of the twin-screw extruder extrusion is heated at 210°C for 6 minutes for melting; the ejected tow passes through the first hot barrel with a temperature of 80°C, and the second hot barrel is maintained for 15 minutes and the temperature is 120°C, and then is metered by a metering pump and extruded from the special-shaped spinneret to form a tow; Step 4 Spinning: The polymer melt after being heated by the second heat cylinder at a temperature of 110°C for 8 minutes is cooled and solidified in a blower, enters the spinneret channel, is extruded from the special-shaped spinneret hole, and is spun through the first heat cylinder at a temperature of 80°C for 3 minutes, and then cooled and solidified in a blower; Step 5: placing the formed spun deformation-resistant low-elastic yarn in a first steaming drum at a temperature of 30° C. for 2 minutes, then placing it in a second steaming drum at a temperature of 30° C. for 2 minutes, and then placing it in a third steaming drum at a temperature of 60° C. for 2 minutes; Step six post-treatment: the first bleaching liquid is composed of 0.74g / L sodium carbonate, 0.68g / L chelating dispersant, 1.46g / L disodium hydrogen phosphate and water, the second bleaching liquid is composed of 0.73g / L scouring agent, 0.52g / L chelating dispersant, 1.4g / L hydrogen peroxide and water, the third bleaching liquid is composed of 0.23g / L sodium silicate, 2.1g / L disodium hydrogen phosphate, 0.7g / L hydrogen peroxide and water, and the fourth bleaching liquid is composed of 0.98g / L chelating dispersant, 4.03g / L disodium hydrogen phosphate, 1.76g / L hydrogen peroxide and water.

[0024] Example 3, spinning: the polymer melt obtained by uniformly adding an amine chain extender and an amine reaction controller to the 128°C temperature zone in step 3 and entering the interior of a kettle reactor for stirring and mixing is then fed into a twin-screw extruder through a quantitative screw silo, and then fed into a spinning assembly after being metered by a metering pump and extruded from a spinneret to form a tow, and the temperature at the outlet of the extruder is maintained at 200°C and heated for 4 minutes for melting, and the obtained molten polymer melt is distributed to two melt barrels through a melt manifold, and heated at a temperature of 220°C for 6 minutes for melting in a twin-screw extruder; the ejected tow passes through a first hot barrel at a temperature of 90°C, and a second hot barrel maintained for 15 minutes at a temperature of 130°C, and then metered by a metering pump and extruded from a special-shaped spinneret to form a tow; Step 4 Spinning: The polymer melt after being heated by the second heat cylinder at 120°C for 9 minutes is cooled and solidified in a blower, enters the spinneret channel, is extruded from the special-shaped spinneret hole, and is passed through the first heat cylinder at 90°C for 4 minutes, and then cooled and solidified in a blower; Step 5: Place the formed spun anti-deformation low-elastic yarn in a first steaming drum at a temperature of 40° C. for 2 minutes, then place it in a second steaming drum at a temperature of 40° C. for 2 minutes, and then place it in a third steaming drum at a temperature of 70° C. for 2 minutes; Step six post-treatment: the first bleaching liquid is composed of 0.74g / L sodium carbonate, 0.68g / L chelating dispersant, 1.46g / L disodium hydrogen phosphate and water, the second bleaching liquid is composed of 0.73g / L scouring agent, 0.52g / L chelating dispersant, 1.4g / L hydrogen peroxide and water, the third bleaching liquid is composed of 0.23g / L sodium silicate, 2.1g / L disodium hydrogen phosphate, 0.7g / L hydrogen peroxide and water, and the fourth bleaching liquid is composed of 0.98g / L chelating dispersant, 4.03g / L disodium hydrogen phosphate, 1.76g / L hydrogen peroxide and water.

[0025] Example 4, spinning: the polymer melt obtained by uniformly adding an amine chain extender and an amine reaction controller to the 129°C temperature zone in step 3 and stirring and mixing the polymer melt inside the autoclave reactor is then fed into a twin-screw extruder through a quantitative screw silo, and then fed into a spinning assembly after being metered by a metering pump and extruded from a spinneret to form a tow, and then heated at 210°C for 4 minutes at the outlet of the extruder for melting, and the obtained molten polymer melt is distributed to two melt barrels through a melt manifold, and then heated at 230°C for 6 minutes for melting in a twin-screw extruder; the ejected tow passes through a first hot barrel at a temperature of 100°C, and a second hot barrel at a temperature of 140°C for 15 minutes, and then is metered by a metering pump and extruded from a special-shaped spinneret to form a tow; Step 4 Spinning: The polymer melt after being heated by the second heat drum at 130°C for 9 minutes is cooled and solidified in a blower, enters the spinneret channel, is extruded from the special-shaped spinneret hole, and is spun through the first heat drum at 100°C for 4 minutes, and then cooled and solidified in a blower; Step 5: Place the formed spun deformation-resistant low-elastic yarn in a first steaming drum at a temperature of 50° C. for 2 minutes, then place it in a second steaming drum at a temperature of 50° C. for 2 minutes, and then place it in a third steaming drum at a temperature of 80° C. for 2 minutes; Step six post-treatment: the first bleaching liquid is composed of 0.74g / L sodium carbonate, 0.68g / L chelating dispersant, 1.46g / L disodium hydrogen phosphate and water, the second bleaching liquid is composed of 0.73g / L scouring agent, 0.52g / L chelating dispersant, 1.4g / L hydrogen peroxide and water, the third bleaching liquid is composed of 0.23g / L sodium silicate, 2.1g / L disodium hydrogen phosphate, 0.7g / L hydrogen peroxide and water, and the fourth bleaching liquid is composed of 0.98g / L chelating dispersant, 4.03g / L disodium hydrogen phosphate, 1.76g / L hydrogen peroxide and water.

[0026] Example 5, spinning: the polymer melt obtained by uniformly adding the amine chain extender and the amine reaction controller to the 130°C temperature zone in step 3 and stirring and mixing the polymer melt inside the autoclave reactor is then fed into the twin-screw extruder through the quantitative screw silo, and then fed into the spinning assembly after being metered by the metering pump and extruded from the spinneret to form a tow, and the temperature at the outlet of the extruder is maintained at 210°C and heated for 4 minutes for melting, and the obtained molten polymer melt is distributed to two melt barrels through the melt main pipe, and heated at the extrusion temperature of the twin-screw extruder at 230°C for 6 minutes for melting; the ejected tow passes through the first hot barrel at a temperature of 100°C, and the second hot barrel is maintained for 15 minutes and the temperature is 140°C, and then metered by the metering pump and extruded from the special-shaped spinneret to form a tow; Step 4 Spinning: The polymer melt after being heated by the second heat drum at 130°C for 9 minutes is cooled and solidified in a blower, enters the spinneret channel, is extruded from the special-shaped spinneret hole, and is spun through the first heat drum at 100°C for 4 minutes, and then cooled and solidified in a blower; Step 5: Place the formed spun deformation-resistant low-elastic yarn in a first steaming drum at a temperature of 50° C. for 2 minutes, then place it in a second steaming drum at a temperature of 50° C. for 2 minutes, and then place it in a third steaming drum at a temperature of 80° C. for 2 minutes; Step six post-treatment: the first bleaching liquid is composed of 0.74g / L sodium carbonate, 0.68g / L chelating dispersant, 1.46g / L disodium hydrogen phosphate and water, the second bleaching liquid is composed of 0.73g / L scouring agent, 0.52g / L chelating dispersant, 1.4g / L hydrogen peroxide and water, the third bleaching liquid is composed of 0.23g / L sodium silicate, 2.1g / L disodium hydrogen phosphate, 0.7g / L hydrogen peroxide and water, and the fourth bleaching liquid is composed of 0.98g / L chelating dispersant, 4.03g / L disodium hydrogen phosphate, 1.76g / L hydrogen peroxide and water.

[0027] Comparative example: The difference between Comparative example 1 and Example 1 is that, while the pretreatment materials of semi-dull polyester low-elastic yarn, including silicone polyester chips, flaky mica, alumina powder, polyoxypropylene and silicone polyether silicone oil, remain unchanged, the time and pretreatment speed are adjusted upward and decrease with the change of temperature, so that the spinning viscosity rate changes downward as shown in the following table.

[0028]

[0029] Results: When the pretreatment time, pretreatment raw materials and spinning speed of semi-dull polyester low-elastic yarn were adjusted and increased, and the silicone polyester chips, flaky mica, alumina powder, polyoxypropylene and silicone polyether silicone oil remained unchanged, the temperature was increased at the same time, and the spinning viscosity rate increased. The final experimental conclusion was that the higher the temperature, the greater the spinning viscosity rate.

[0030] It should be noted that, in this article, the terms "comprise", "include" or any other variant thereof are intended to cover non-exclusive inclusion, so that the process, method, article or device including a series of elements includes not only those elements, but also includes 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 one..." do not exclude the presence of other identical elements in the process, method, article or device including the element. In addition, it should be pointed out that the scope of the methods and devices in the embodiments of the present application is not limited to performing functions in the order shown or discussed, and may also include performing functions in a substantially simultaneous manner or in reverse order according to the functions involved, for example, the described method may be performed in an order different from that described, and various steps may also be added, omitted, or combined. In addition, the features described with reference to certain examples may be combined in other examples.

[0031] The embodiments of the present application are described above in conjunction with the accompanying drawings, but the present application is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of the present application, ordinary technicians in this field can also make many forms without departing from the purpose of the present application and the scope of protection of the claims, all of which are within the protection of the present application.

Claims

1. A method for preparing semi-dull polyester low-elastic yarn, characterized in that: The method for preparing semi-dull polyester low-elastic yarn comprises the following steps in sequence: The raw materials of the semi-dull polyester low-elastic yarn are silicone polyester slices, flaky mica, aluminum oxide powder, polyoxypropylene and silicone polyether silicone oil in a weight ratio of 1.9:0.7:2.0:2.5:0.7 respectively, and polypropylene, silicone polyether silicone oil, polyethylene glycol, dimethyl phthalate and ethylene glycol are prepared in a weight ratio of 0.05:3.2:3.5:3.7:3.6 respectively; the preparation method of the semi-dull polyester low-elastic yarn comprises the following steps in sequence: Step 1: Prepare raw materials; Step 2: Preprocessing; Step 3: Spinning; Step 4: Spinning; Step 5: Post-processing.

2. The method for preparing semi-dull polyester low-elastic yarn according to claim 1, characterized in that: Step 1: Raw material preparation: prepare silicone polyester chips, flaky mica, alumina powder and silicone polyether silicone oil in a weight ratio of 9.1:0.3:0.13:0.24 respectively.

3. The method for preparing semi-dull polyester low-elastic yarn according to claim 1, characterized in that: Step 2: Pretreatment: pre-crystallize the above-mentioned silicone polyester chips, alumina powder, and polyethylene glycol, and then perform solid-phase polymerization to obtain silicone polyester chips with a viscosity of 1.602~1.71dl / g; wherein the temperature of the above-mentioned pre-crystallization is controlled at 229~231°C, and the pre-crystallization time is 4~8min; the temperature of the above-mentioned solid-phase polymerization is controlled at 256~259°C, and the solid-phase polymerization time is maintained for 10~13min; then the above-mentioned silicone polyester chips with a viscosity of 1.803l / g are added to a kettle reactor equipped with a stirring roller and a cooling coil, and are fully stirred and mixed, wherein the temperature of the above-mentioned cooling coil is 28~35°C; after cooling, they are added to a single-screw extruder, and the single-screw extruder is evenly divided into 3 zones according to the length of the extrusion tube, the temperatures of the five zones are 126°C, 127°C, 129°C, 131°C, and 140°C, and the screw speed is 279rpm.

4. The method for preparing semi-dull polyester low-elastic yarn according to claim 1, characterized in that: (3) Spinning: The polymer melt obtained by uniformly adding the amine chain extender and the amine reaction control agent into the 126°C temperature zone in step (2) and stirring and mixing the polymer melt in the autoclave reactor is then fed into a twin-screw extruder through a quantitative screw hopper, metered by a metering pump, and fed into a spinning assembly to be extruded from a spinneret to form a tow. The temperature at the outlet of the extruder is maintained at 200 to 226°C and heated for 3 to 8 minutes for melting. The obtained molten polymer melt is distributed to two melt barrels through a melt manifold and heated for 10 minutes at a temperature of 300 to 315°C for extrusion in a twin-screw extruder. The ejected tow passes through a first hot barrel at a temperature of 100°C and a second hot barrel at a temperature of 150°C for 20 minutes, and then metered by a metering pump and extruded from a special-shaped spinneret to form a tow.

5. The method for preparing semi-dull polyester low-elastic yarn according to claim 1, characterized in that: (4) Spinning: The polymer melt is heated in the second heat drum at 100°C for 10 minutes, then cooled and solidified in a blower, enters the spinneret channel, is extruded from the special-shaped spinneret hole, and is spun through the first heat drum at 80°C for 3 minutes, and then cooled and solidified in a blower.

6. The method for preparing semi-dull polyester low-elastic yarn according to claim 1, characterized in that: (5) The formed spun deformation-resistant low-elastic yarn is placed in a first cooking drum at a temperature of 30-40°C for 2 minutes, then placed in a second cooking drum at a temperature of 40-50°C for 2 minutes, and then placed in a third cooking drum at a temperature of 50-60°C for 2 minutes.

7. The method for preparing semi-dull polyester low-elastic yarn according to claim 1, characterized in that: (6) Post-treatment: The first bleaching liquid consists of 0.64 g / L sodium carbonate, 0.78 g / L chelating dispersant, 1.56 g / L disodium hydrogen phosphate and water; the second bleaching liquid consists of 0.73 g / L scouring agent, 0.42 g / L chelating dispersant, 1.3 g / L hydrogen peroxide and water; the third bleaching liquid consists of 0.23 g / L sodium silicate, 3.1 g / L disodium hydrogen phosphate, 0.8 g / L hydrogen peroxide and water; the fourth bleaching liquid consists of 0.98 g / L chelating dispersant, 2.03 g / L disodium hydrogen phosphate, 1.76 g / L hydrogen peroxide and water.

8. The method for preparing semi-dull polyester low-elastic yarn according to claim 1, characterized in that: In step (1), the above-mentioned silicone polyester chips are pre-crystallized and then solid-phase polymerized to obtain silicone polyester chips with a viscosity of 2.7 dl / g.

9. The method for preparing semi-dull polyester low-elastic yarn according to claim 1, characterized in that: In step (3), the temperature is maintained at 240° C. for 20 minutes before the twin-screw extruder exit for melting.

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