A preparation method of cationic polyester DTY

Abstract

The present invention relates to a preparation method of cationic polyester DTY. Cationic polyester POY adopts a texturing process to prepare cationic polyester DTY. During the texturing process, a talcum powder suspension is sprayed on the surface of a hot box that contacts with a silk strip; the talcum powder suspension is prepared by adding talcum powder to water; the mass ratio of talcum powder to water is 2:8-5:5, preferably 4:6; the prepared cationic polyester DTY is woven into a garter and then dyed, and the dyeing uniformity is above level 4. A preparation method of cationic polyester DTY of the present invention sprays a talcum powder suspension on the surface of the silk strip that contacts with a wire-running channel in a hot box to eliminate or reduce static electricity on the fiber in the hot box. The talcum powder can help construct a conduction path so that charged particles can come into contact, thereby facilitating the release of electric charges, reducing the jumping or shaking of the fiber in the hot box, and avoiding the problem of poor dyeing during subsequent dyeing of the DTY product.

Description

Technical Field

[0001] The invention belongs to the technical field of polyester fibers and relates to a preparation method of cationic polyester DTY, in particular to a method for reducing fiber jumping or shaking in a heat box during the production of cationic polyester DTY. Background Art

[0002] Cationic fiber generally refers to cationic polyester, which has a low moisture regain (about 0.38~0.4%), much lower than some natural fibers and regenerated fibers, such as wool with a moisture regain of about 16%, viscose with a moisture regain of about 13%, mulberry silk with a moisture regain of about 11%, and cotton with a moisture regain of about 8.5%. From the moisture regain data, it can be seen that cationic fiber has poor hygroscopicity, and it is difficult for water molecules to enter its fiber interior and be adsorbed, making it difficult to form a continuous water film on the fiber surface during processing to conduct charge, and the charge is easy to accumulate and generate static electricity. During the texturing process, polyester fiber and the machine's yarn guide, roller and other parts frequently and at high speeds rub against each other. According to the principle of friction electrification, when different substances rub against each other, substances with weak electron binding ability will lose electrons and thus carry positive charges. After friction between polyester fiber and machine parts, static electricity is easily generated; in the dry environment of the hot box, the humidity in the air is lower, and static electricity is more likely to accumulate and cannot be released. Static electricity has an adsorption effect on polyester fibers. When polyester fibers are running on a hot box, the adsorption force generated by static electricity is uneven. The movement of the adsorbed part of the polyester fibers is hindered, while the unadsorbed part of the polyester fibers moves normally, resulting in inconsistent forces at different positions of the polyester fibers. As a result, the polyester fibers will jump or shake on the hot box. The shaking or jumping of the polyester fibers will cause unstable heating of the polyester fibers, resulting in poor dyeing of the product.

[0003] In view of the above problems, one approach in the art is to spray a texturizing antistatic oil on the hot box. However, since the temperature of the hot box is more than 200 degrees Celsius, the texturizing antistatic oil is easy to volatilize, so that the duration of the antistatic effect obtained by the silk thread when passing through the hot box is short; another approach is to apply an antistatic coating on the hot box, but when cleaning the hot box, it is necessary to remove the coke inside the hot box, which will cause the antistatic coating to be easily removed.

[0004] In addition, patent CN219780464U discloses a static elimination treatment device for a polyester yarn texturing machine, which drives the screw block to move by rotating the screw rod, thereby adjusting the working position of the ion blower, and performs static elimination treatment on the machine body and polyester yarn. After the hot box is cleaned, the static electricity generated by the removal of antistatic oils, etc., can be effectively eliminated. However, there is also a problem that the static elimination effect is not long-lasting and not immediate.

[0005] Therefore, it is of great significance to study a preparation method of cationic polyester DTY to solve the above problems. Summary of the invention

[0006] The purpose of the invention is to solve the problems existing in the prior art and provide a method for preparing cationic polyester DTY.

[0007] To achieve the above object, the technical solution adopted by the present invention is as follows:

[0008] A method for preparing cationic polyester DTY, wherein the cationic polyester POY is prepared by a texturing process, and during the texturing process, a talcum powder suspension is sprayed on the surface of a hot box in contact with the filaments;

[0009] Talc suspension is made by adding talc to water;

[0010] The mass ratio of talcum powder to water is 2:8~5:5.

[0011] As the preferred technical solution:

[0012] In the method for preparing cationic polyester DTY as described above, a wire-feeding channel penetrating the hot box is provided on the hot box; a talcum powder suspension is sprayed on the bottom of the wire-feeding channel; and the silk thread passes through the wire-feeding channel and contacts the bottom of the wire-feeding channel.

[0013] In the method for preparing cationic polyester DTY as described above, the mass ratio of talc to water in the talc suspension is preferably 4:6.

[0014] In the preparation method of cationic polyester DTY as described above, talcum powder suspension is evenly sprayed on the bottom of the wire-running channel running through the hot box, and the spraying amount is 40-60 mL / m 2 .

[0015] The preparation method of cationic polyester DTY as described above has the following texturizing process flow: raw yarn rack → cutter → first roller → upper heat box → cooling plate → false twister → second roller → network device → lower heat box (setting heat box) → third roller → wire guide → oiling device → winding device.

[0016] The melt-spun cationic polyester POY precursor is used as the raw material, and its performance indicators must meet the production requirements to ensure the smooth progress of subsequent processing. The cationic polyester POY precursor is placed on the precursor rack of the texturing machine, and the silk strips are led out and passed through the cutter, the first roller and other components in turn. The first roller is the feeding roller, which is used to hold and transport the silk strips; the silk strips enter the upper heating box for heating and stretching. This hot box usually adopts a composite heating method, and the temperature is generally around 180~200℃; the silk strips coming out of the upper heating box are cooled by the cooling plate; the cooled silk strips are transported by the first roller to the false twister for false twisting. The false twister is the core component of the texturing machine. It is turned by the friction disk. The yarn is twisted and untwisted to form a false twist, thereby giving the yarn curling and elasticity; the false-twisted yarn passes through the second roller and is stretched by the speed difference between the second roller and the first roller; the stretched yarn passes through the network device to form network points in the yarn to improve the cohesion of the yarn; then the yarn enters the lower hot box, which is a shaping hot box and uses non-contact air heating; the shaped yarn passes through the third roller yarn guide and is then oiled by an oil tanker; the oiled yarn is finally wound and formed by a winding device to form a cationic polyester DTY product.

[0017] In the method for preparing cationic polyester DTY as described above, the talcum powder suspension is sprayed on the bottom of the wire-feeding channel arranged on the upper heating box.

[0018] The reason why only the upper hot box is sprayed with talcum powder suspension, and the lower hot box does not need to be sprayed with talcum powder suspension again, is mainly because:

[0019] One is the difference in the state of the wire strips. When the wire strips enter the upper heat box, they may have just been drawn out from the original wire. They are relatively dry and are affected by factors such as friction with equipment components in the initial state, which makes it easy to generate and accumulate static electricity. After passing through the upper heat box and some subsequent processes, when they reach the lower heat box, the humidity, surface characteristics, etc. of the wire strips may have changed, which is not conducive to the accumulation of static electricity.

[0020] Second, the equipment components are different. The internal structure and materials used of the upper heat box are different from those of the lower heat box. For example, some parts of the upper heat box have a large friction coefficient and poor conductivity, which makes it easy for the wire to generate static electricity when rubbing against it, while the corresponding parts of the lower heat box are more conducive to conducting static electricity or are not prone to generating static electricity due to friction.

[0021] The third is the influence of the process environment. The environmental conditions such as temperature, humidity, and air circulation around the upper hot box may not be conducive to the dissipation of static electricity, and may easily cause static electricity to accumulate. However, the environment in which the lower hot box is located is relatively more conducive to the natural dissipation of static electricity through air and other media, or the static electricity elimination-related auxiliary facilities equipped around the equipment are more effective, making it difficult for static electricity to remain.

[0022] In the preparation method of a cationic polyester DTY as described above, the texturing process parameters include: texturing speed: 500~800 m / dm / min; stretching ratio: 1.68~1.75, the stretching ratio refers to the ratio of the linear speed of the second roller outputting the filament to the linear speed of the first roller feeding; upper heating box temperature: 160~200℃; lower heating box temperature: 140~160℃; network pressure: 3.4±0.2bar; network pressure refers to the compressed air pressure at the network nozzle. Appropriate network pressure can enable the filament to obtain a good network effect. If the pressure is too low, the filament network points are few and the cohesion is poor; if the pressure is too high, it will cause energy waste and may also damage the filament. The network nozzle model uses the Donghong 1.6 caliber nozzle. Different models of network nozzles have different internal structures and will produce different network effects on the filament. Its selection depends on factors such as the type and thickness of the silk. For example, the network nozzle models used to produce fine denier yarns and coarse denier yarns are usually different; false twist ratio: 1.8~2.2, the false twist ratio refers to the ratio of the surface speed of the friction disk (D) to the speed (Y) of the yarn leaving the false twister; the yarn output ratio: -6~-4%, the yarn output ratio is the ratio of the output third roller line speed to the feed second roller line speed; winding ratio: -6~-4%; forming interlacing angle: 28°~32°; the forming interlacing angle is the winding cross angle, which refers to the angle formed by the movement direction of the reciprocating yarn guide and the winding axis direction of the bobbin during the winding process of the yarn. This angle is very important for the winding and forming of the yarn on the bobbin. The appropriate interlacing angle can make the yarn evenly distributed on the bobbin and avoid overlap and extrusion between the yarn layers. For example, if the winding angle is not set reasonably, the wire may be concentrated on one side of the bobbin, resulting in poor forming and affecting the subsequent use performance of the wire such as unwinding performance; cooling plate temperature: 45~60℃; domestic Henglong TK-3181 oil is used for oiling, and the oiling frequency is 10.5~15.5Hz.

[0023] A method for preparing a cationic polyester DTY as described in any of the above items, wherein the cationic polyester DTY has a linear density CV value of ≤1.5%, a breaking strength ≥1.8 cN / dtex, a breaking strength CV value ≤5.2%, an elongation at break of 20±6.0%, an elongation at break CV value ≤7.9%, a curl shrinkage rate of 5.2~7.5%, a curl shrinkage rate CV value ≤9.6%, a curl stability ≥55%, a boiling water shrinkage rate of 4.5~5.4%, an oil content of 3.5±0.8%, and a network degree of 90±10 pieces / m.

[0024] The linear density CV value is ≤1.5%, and the coefficient of variation (CV value) of the linear density is small, indicating that the thickness uniformity of the fiber is good. The uniform thickness of the fiber means that when passing through the heat box, the external effects such as heat transfer and air resistance on each part are relatively more balanced, indicating that the present invention reduces the fiber jumping or shaking caused by electrostatic adsorption and repulsion.

[0025] The CV value of breaking strength is ≤5.2%, and the CV value of breaking elongation is ≤7.9%. The CV values ​​of breaking strength and breaking elongation are small, which means that the breaking strength and breaking elongation of different fibers or different parts of the same fiber are basically the same. It can be seen that in the hot box environment, the fiber jumping or shaking caused by static electricity is reduced, so that the fiber can run smoothly when passing through the hot box during the texturing process, and the relative position changes between fibers and between fibers and hot box components are small.

[0026] The curl shrinkage is 5.2~7.5%, the curl shrinkage CV value is ≤9.6%, the curl shrinkage and CV value are reasonable, and the curl stability is high enough. The curl morphology is affected by the cohesion between the fibers and the interaction with the environment in the hot box. Stable curling means that the fibers fit well together, and there is no static electricity generated by friction with each other or irregular friction with the inner wall of the hot box, which causes uneven force on the fibers during movement in the hot box and causes jumping or shaking.

[0027] The boiling water shrinkage is 4.5-5.4%. The appropriate boiling water shrinkage reflects the good thermal stability of the fiber. In the high temperature environment of the hot box, the good thermal stability of the fiber means that its size and shape have not undergone large and uncontrollable changes, which means that the present invention avoids the fiber movement disorder caused by inconsistent shrinkage, thereby reducing the jumping and shaking of the fiber;

[0028] The network degree is a parameter to measure the network effect of the silk strip, which indicates the number of network nodes per meter of silk strip. It affects the cohesion and unwinding performance of the silk. The size of the network degree is set according to the final use of the product. For example, the network degree requirements for silk used for weaving and silk used for knitting will be different.

[0029] The above-mentioned indicators illustrate the good condition of the fiber in the hot box from multiple aspects such as fiber thickness, strength, elongation, curl, thermal stability, etc., indicating that in the production process of cationic polyester DTY, the present invention effectively eliminates or reduces the static electricity on the fiber in the hot box by spraying talcum powder suspension on the surface where the silk strips contact the wire running channel in the hot box, so that the fiber in the hot box reduces jumping or shaking.

[0030] According to the method for preparing cationic polyester DTY, the cationic polyester DTY is woven into garters and then dyed, and the dyeing uniformity is above level 4.

[0031] Dyeing uniformity is usually measured by weaving DTY into garters, dyeing it with standard DTY using cationic red X-GRL250%, and then testing it with a gray card under a standard light source. The color difference with the standard DTY is 4 levels or more, which is a first-class product. Types of dyeing abnormalities include dark and light colors, horizontal stripes, and transparent silk.

[0032] Principle of the invention:

[0033] In the production process of cationic polyester DTY, the present invention sprays talcum powder suspension on the surface of the yarn in contact with the wire running channel in the hot box to eliminate or reduce static electricity on the fibers in the hot box, so that the fibers in the hot box are less likely to jump or shake, thereby avoiding the problem of poor dyeing during subsequent dyeing of the DTY product.

[0034] Talc can help build a conductive path so that charged particles can come into contact, thereby facilitating the release of charges. Specifically, talc is a substance with a certain degree of conductivity (although the conductivity is relatively weak, it can play a role in some specific scenarios). In the hot box environment of fiber processing, charges are easily accumulated on the fiber surface, and talc particles can be attached to the fiber surface or distributed in the space around the fiber. Because talc itself has a structure that can conduct electrons, many talc particles can form a "bridge"-like connection with each other. When they are sprayed in the hot box, it is equivalent to building a path for the movement of charges in an environment where charges are difficult to conduct smoothly. That is, a conduction path, so that the charges are no longer limited to accumulating in large quantities on the fibers, but can be transmitted along the path constructed by the talc. This conductive path constructed by talcum powder provides a moving channel for the charges accumulated on the fiber surface due to friction (positively or negatively charged particles formed by static electricity on the fiber surface due to friction and other reasons). The charges can be transferred along this path, allowing the charged particles to contact and neutralize each other, thereby helping to release the charges, thereby effectively reducing the adverse effects of static electricity accumulation on the fiber processing process.

[0035] After the talcum powder suspension comes into contact with the silk strip, it can form a conductive layer on the surface of the silk strip, thereby reducing the surface resistivity and allowing the generated static charge to leak quickly. The main component of talcum powder is hydrous magnesium silicate, and its theoretical composition mass percentage is 63.6% SiO 2 , 21.89% MgO and 4.75% H 2 O, that is, theoretically, the content of hydrous magnesium silicate can be regarded as 100%, but in reality, it may contain impurities due to factors such as the origin. The SiO content of common commercial talc is 2 The content is generally 10~65%. After the talcum powder suspension comes into contact with the polyester fiber, the talcum powder is adsorbed on the filament with water. The talcum powder has lubricity and can reduce the friction coefficient, thereby inhibiting and reducing the generation of static charge on the filament. The original charge on the filament will also be adsorbed by the talcum powder particles, so that the charge is dispersed and the static electricity accumulation is reduced. After the polyester filament leaves the hot box, the twister and roller in the subsequent process will come into contact with the filament and generate friction, which will remove the talcum powder particles, thereby avoiding the impact of talcum powder on the product.

[0036] When the talc content in the talc suspension is too much, firstly, the excessive talc cannot be completely dissolved or evenly dispersed in water, which will result in more solid powder left on the surface of the hot box and other parts, which may interfere with the normal operation of the wire strip, increase the friction between the wire strip and the equipment, and even cause the wear or breakage of the wire strip; secondly, because there is not enough water to make the talc evenly adhere to the surface of the wire strip, it will cause too much or too little talc locally, making the antistatic performance different in different parts of the wire strip, and the antistatic effect may be unstable. When the talc content in the talc suspension is too little, the talc content that can play an antistatic role per unit volume will be reduced, and the static electricity generated by the wire strip in the hot box cannot be effectively reduced, thereby affecting the smooth progress of the texturing process.

[0037] Beneficial effects:

[0038] The invention discloses a method for preparing cationic polyester DTY, which sprays a talcum powder suspension on the surface of the yarn in contact with the wire-running channel in the upper heating box to eliminate or reduce the static electricity on the fibers in the heating box, so that the fibers in the heating box can reduce the jumping or shaking, thereby avoiding the problem of poor dyeing in the subsequent dyeing of the DTY product. DETAILED DESCRIPTION

[0039] The present invention will be further described below in conjunction with specific embodiments. It should be understood that these embodiments are only used to illustrate the present invention and are not intended to limit the scope of the present invention. In addition, it should be understood that after reading the content taught by the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms fall within the scope limited by the appended claims of the application equally.

[0040] In all embodiments and comparative examples of the present invention, the performance indicators involved, such as linear density CV value, breaking strength, breaking elongation, breaking strength CV value, breaking elongation CV value, curl shrinkage, curl shrinkage CV value, curl stability, boiling water shrinkage, oil content and network degree, are tested with reference to the industry standard FZ / T 54067-2013 Cationic Dye Dyeable Modified Polyester Low-Stretch Yarn (this standard is drafted according to the rules given in GB / T1.1-2009).

[0041] Example 1

[0042] A method for preparing cationic polyester DTY, the specific process is as follows:

[0043] Cationic polyester POY is made into cationic polyester DTY by texturizing process;

[0044] Cationic polyester POY is a cationic polyester POY raw yarn obtained by melt direct spinning, with a linear density CV value of 0.2%, a breaking strength of 1.68 cN / dtex, a breaking strength CV value of 2.11%, a breaking elongation of 144.9%, a breaking elongation CV value of 2.58%, and an oil content of 0.35%;

[0045] The texturing process is as follows: raw yarn rack → wire cutter → first roller → upper heating box → cooling plate → false twister → second roller → networker → lower heating box → third roller → wire guide → oiling device → winding device;

[0046] The upper heating box is provided with a wire-running passage that passes through the upper heating box; the talcum powder suspension is evenly sprayed on the bottom of the wire-running passage provided on the upper heating box; the wire passes through the wire-running passage and contacts the bottom of the wire-running passage; the spraying amount of the talcum powder suspension is 50 mL / m 2 ; The talcum powder suspension was prepared by adding talcum powder (manufacturer: Guilin Guiguang Talc Development Co., Ltd., brand: K brand) into water; the mass ratio of talcum powder to water was 4:6;

[0047] The texturing process parameters include: texturing speed: 720 m / min; stretching ratio: 1.70; upper hot box temperature: 190°C; lower hot box temperature: 160°C; network pressure: 3.4 bar; false twist ratio: 2.0; yarn output ratio: -5.2%; winding ratio: -4.8%; forming winding angle: 28°; cooling plate temperature: 50°C; oiling frequency: 15.5Hz.

[0048] The cationic polyester DTY finally obtained has a linear density CV value of 0.2%, a breaking strength of 2.66 cN / dtex, a breaking strength CV value of 1.8%, a breaking elongation of 23.5%, a breaking elongation CV value of 3.6%, a curl shrinkage rate of 7.5%, a curl shrinkage rate CV value of 4.5%, a curl stability of 68%, a boiling water shrinkage rate of 4.5%, an oil content of 3.1%, and a network degree of 90 pieces / m; the cationic polyester DTY is woven into garters and then dyed with cationic red X-GRL250%, and the dyeing uniformity (gray card) grade is level 5.

[0049] Comparative Example 1

[0050] A method for preparing cationic polyester DTY is basically the same as that in Example 1, except that the operation of spraying talcum powder suspension onto the bottom of the wire-traveling channel arranged on the upward heating box is not performed.

[0051] The cationic polyester DTY finally obtained has a linear density CV value of 1.2%, a breaking strength of 1.9 cN / dtex, a breaking strength CV value of 6.8%, a breaking elongation of 15.2%, a breaking elongation CV value of 10.2%, a curl shrinkage rate of 3.5%, a curl shrinkage rate CV value of 11.3%, a curl stability of 52.5%, a boiling water shrinkage rate of 5.5%, an oil content of 2.9%, and a network degree of 85 pieces / m; the cationic polyester DTY is woven into garters and then dyed with cationic red X-GRL250%, and the dyeing uniformity (gray card) grade is level 3.

[0052] By comparing Example 1 with Comparative Example 1, it can be seen that the uniformity of linear density, uniformity of breaking strength, uniformity of elongation at break and uniformity of curl shrinkage of Comparative Example 1 deteriorates, the elongation at break, curl shrinkage, breaking strength, curl stability, oil content and network degree decrease, the boiling water shrinkage increases, and the dyeing uniformity is worse than that of Example 1. This is due to the following three factors:

[0053] (1) Friction and force uniformity: Without spraying talcum powder suspension, the friction between the fiber and the equipment components increases during processing and the force is uneven. For example, in the stretching process, the uneven force causes the fiber to be subjected to excessive or insufficient force locally, affecting the formation of its internal structure, resulting in a decrease in indicators such as breaking strength and elongation at break. The CV values ​​of various indicators increase due to uneven force, and the CV values ​​of breaking strength and elongation at break deteriorate. In the curling process, due to uneven force, the curling shrinkage is not ideal, and the curling shrinkage rate, its CV value, curling stability and other indicators are not as good as those in Example 1.

[0054] (2) Influence of static electricity: If talcum powder suspension is not sprayed, static electricity is easily generated on the fiber surface, which will cause the fibers to adsorb and entangle with each other, destroying the original orderly arrangement structure of the fibers, and thus affecting the overall performance of the filaments. For example, during network processing, static electricity interference makes it difficult for the filaments to form a good network structure, resulting in a decrease in network degree; in subsequent tests, the damage to the fiber structure also causes changes in indicators such as boiling water shrinkage.

[0055] (3) Oil distribution and cohesion: Talc helps the oil to adhere better and be evenly distributed on the fiber surface. If the talc suspension is not sprayed, the final fiber oil content will be affected and reduced. At the same time, talc can enhance the cohesion between the strands. When talc is lacking, the strands will not cohere well, and they cannot be coordinated in the processing links and deform, which further causes the deterioration of various physical performance indicators.

[0056] Example 2

[0057] A method for preparing cationic polyester DTY, the specific process is as follows:

[0058] Cationic polyester POY is made into cationic polyester DTY by texturizing process;

[0059] Cationic polyester POY is a cationic polyester POY raw yarn obtained by melt direct spinning, with a linear density CV value of 0.2%, a breaking strength of 1.68 cN / dtex, a breaking strength CV value of 2.11%, a breaking elongation of 144.9%, a breaking elongation CV value of 2.58%, and an oil content of 0.35%;

[0060] The texturing process is as follows: raw yarn rack → wire cutter → first roller → upper heating box → cooling plate → false twister → second roller → networker → lower heating box → third roller → wire guide → oiling device → winding device;

[0061] The upper heating box is provided with a wire-running passage that passes through the upper heating box; the talcum powder suspension is evenly sprayed on the bottom of the wire-running passage provided on the upper heating box; the wire passes through the wire-running passage and contacts the bottom of the wire-running passage; the spraying amount of the talcum powder suspension is 45 mL / m 2 ; Talc suspension is made of talc (manufacturer: Guangxi Longyao Talc Development Co., Ltd., SiO 2 The mass ratio of talcum powder to water is 3:7;

[0062] The texturing process parameters include: texturing speed: 720 m / min; stretching ratio: 1.70; upper hot box temperature: 190°C; lower hot box temperature: 160°C; network pressure: 3.4 bar; false twist ratio: 2.0; yarn output ratio: -5.2%; winding ratio: -4.8%; forming winding angle: 28°; cooling plate temperature: 50°C; oiling frequency: 15.5Hz.

[0063] The cationic polyester DTY finally obtained has a linear density CV value of 0.4%, a breaking strength of 2.58 cN / dtex, a breaking strength CV value of 3.2%, a breaking elongation of 22.3%, a breaking elongation CV value of 4.6%, a curl shrinkage of 7.0%, a curl shrinkage CV value of 5.6%, a curl stability of 62%, a boiling water shrinkage of 5.0%, an oil content of 3.0%, and a network degree of 88 pieces / m; the cationic polyester DTY is woven into garters and then dyed with cationic red X-GRL250%, and the dyeing uniformity (gray card) grade is level 4.

[0064] Example 3

[0065] A method for preparing cationic polyester DTY, the specific process is as follows:

[0066] Cationic polyester POY is made into cationic polyester DTY by texturizing process;

[0067] Cationic polyester POY is a cationic polyester POY raw yarn obtained by melt direct spinning, with a linear density CV value of 0.2%, a breaking strength of 1.68 cN / dtex, a breaking strength CV value of 2.11%, a breaking elongation of 144.9%, a breaking elongation CV value of 2.58%, and an oil content of 0.35%;

[0068] The texturing process is as follows: raw yarn rack → wire cutter → first roller → upper heating box → cooling plate → false twister → second roller → networker → lower heating box → third roller → wire guide → oiling device → winding device;

[0069] The upper heating box is provided with a wire-running passage that passes through the upper heating box; the talcum powder suspension is evenly sprayed on the bottom of the wire-running passage provided on the upper heating box; the wire passes through the wire-running passage and contacts the bottom of the wire-running passage; the spraying amount of the talcum powder suspension is 50 mL / m 2 ; Talc suspension is made of talc (manufacturer: Haicheng Houying Economic and Trade Group Co., Ltd., SiO 2 The mass ratio of talcum powder to water is 15:5;

[0070] The texturing process parameters include: texturing speed: 720 m / min; stretching ratio: 1.70; upper hot box temperature: 190°C; lower hot box temperature: 160°C; network pressure: 3.4 bar; false twist ratio: 2.0; yarn output ratio: -5.2%; winding ratio: -4.8%; forming winding angle: 28°; cooling plate temperature: 50°C; oiling frequency: 15.5Hz.

[0071] The cationic polyester DTY finally obtained has a linear density CV value of 0.8%, a breaking strength of 2.55 cN / dtex, a breaking strength CV value of 3.5%, a breaking elongation of 21.9%, a breaking elongation CV value of 5.7%, a curl shrinkage of 6.8%, a curl shrinkage CV value of 5.7%, a curl stability of 60%, a boiling water shrinkage of 5.3%, an oil content of 3.3%, and a network degree of 85 pieces / m; the cationic polyester DTY is woven into garters and then dyed with cationic red X-GRL250%, and the dyeing uniformity (gray card) grade is level 4.

[0072] Example 4

[0073] A method for preparing cationic polyester DTY, the specific process is as follows:

[0074] Cationic polyester POY is made into cationic polyester DTY by texturizing process;

[0075] Cationic polyester POY is a cationic polyester POY raw yarn obtained by melt direct spinning, with a linear density CV value of 0.2%, a breaking strength of 1.68 cN / dtex, a breaking strength CV value of 2.11%, a breaking elongation of 144.9%, a breaking elongation CV value of 2.58%, and an oil content of 0.35%;

[0076] The texturing process is as follows: raw yarn rack → wire cutter → first roller → upper heating box → cooling plate → false twister → second roller → networker → lower heating box → third roller → wire guide → oiling device → winding device;

[0077] The upper heating box is provided with a wire-running passage that passes through the upper heating box; the talcum powder suspension is evenly sprayed on the bottom of the wire-running passage provided on the upper heating box; the wire passes through the wire-running passage and contacts the bottom of the wire-running passage; the spraying amount of the talcum powder suspension is 55 mL / m 2 ; Talc suspension is made of talc (manufacturer: Liaoning Dongyu Chemical Mineral Group Co., Ltd., SiO 2 The mass ratio of talcum powder to water is 2:8;

[0078] The texturing process parameters include: texturing speed: 500 m / min; stretching ratio: 1.68; upper hot box temperature: 200°C; lower hot box temperature: 150°C; network pressure: 3.2 bar; false twist ratio: 1.8; yarn output ratio: -5.2%; winding ratio: -4.8%; forming winding angle: 29°; cooling plate temperature: 45°C; oiling frequency: 10.5Hz.

[0079] The cationic polyester DTY finally obtained has a linear density CV value of 1.5%, a breaking strength of 2.21 cN / dtex, a breaking strength CV value of 5.2%, a breaking elongation of 19.6%, a breaking elongation CV value of 7.9%, a curl shrinkage rate of 5.2%, a curl shrinkage rate CV value of 9.6%, a curl stability of 55%, a boiling water shrinkage rate of 5.4%, an oil content of 2.8%, and a network degree of 100 pieces / m; the cationic polyester DTY is woven into garters and dyed with cationic red X-GRL250%, and the dyeing uniformity (gray card) grade is level 4.

[0080] Example 5

[0081] A method for preparing cationic polyester DTY, the specific process is as follows:

[0082] Cationic polyester POY is made into cationic polyester DTY by texturizing process;

[0083] Cationic polyester POY is a cationic polyester POY raw yarn obtained by melt direct spinning, with a linear density CV value of 0.2%, a breaking strength of 1.68 cN / dtex, a breaking strength CV value of 2.11%, a breaking elongation of 144.9%, a breaking elongation CV value of 2.58%, and an oil content of 0.35%;

[0084] The texturing process is as follows: raw yarn rack → wire cutter → first roller → upper heating box → cooling plate → false twister → second roller → networker → lower heating box → third roller → wire guide → oiling device → winding device;

[0085] The upper heating box is provided with a wire-running passage that passes through the upper heating box; the talcum powder suspension is evenly sprayed on the bottom of the wire-running passage provided on the upper heating box; the wire passes through the wire-running passage and contacts the bottom of the wire-running passage; the spraying amount of the talcum powder suspension is 60 mL / m 2 ; Talc suspension is made of talc (manufacturer: Guangyuan Chemical, SiO 2 The mass ratio of talcum powder to water is 4:6;

[0086] The texturing process parameters include: texturing speed: 800 m / min; stretching ratio: 1.82; upper hot box temperature: 180°C; lower hot box temperature: 140°C; network pressure: 3.6 bar; false twist ratio: 2.2; yarn output ratio: -4.2%; winding ratio: -4.0%; forming winding angle: 30°; cooling plate temperature: 60°C; oiling frequency: 11.5 Hz.

[0087] The cationic polyester DTY finally obtained has a linear density CV value of 0.4%, a breaking strength of 2.65 cN / dtex, a breaking strength CV value of 1.9%, a breaking elongation of 23.2%, a breaking elongation CV value of 3.7%, a curl shrinkage of 7.4%, a curl shrinkage CV value of 4.6%, a curl stability of 67%, a boiling water shrinkage of 4.6%, an oil content of 2.9%, and a network degree of 80 pieces / m; the cationic polyester DTY is woven into garters and then dyed with cationic red X-GRL250%, and the dyeing uniformity (gray card) grade is level 4.

[0088] Example 6

[0089] A method for preparing cationic polyester DTY, the specific process is as follows:

[0090] Cationic polyester POY is made into cationic polyester DTY by texturizing process;

[0091] Cationic polyester POY is a cationic polyester POY raw yarn obtained by melt direct spinning, with a linear density CV value of 0.2%, a breaking strength of 1.68 cN / dtex, a breaking strength CV value of 2.11%, a breaking elongation of 144.9%, a breaking elongation CV value of 2.58%, and an oil content of 0.35%;

[0092] The texturing process is as follows: raw yarn rack → wire cutter → first roller → upper heating box → cooling plate → false twister → second roller → networker → lower heating box → third roller → wire guide → oiling device → winding device;

[0093] The upper heating box is provided with a wire-running passage that passes through the upper heating box; the talcum powder suspension is evenly sprayed on the bottom of the wire-running passage provided on the upper heating box; the wire passes through the wire-running passage and contacts the bottom of the wire-running passage; the spraying amount of the talcum powder suspension is 45 mL / m 2 ; Talc suspension is made of talc (manufacturer: Guangyuan Chemical, SiO 2 The mass ratio of talcum powder to water is 4:6;

[0094] The texturing process parameters include: texturing speed: 750 m / min; stretching ratio: 1.75; upper hot box temperature: 160°C; lower hot box temperature: 150°C; network pressure: 3.6 bar; false twist ratio: 2.0; yarn output ratio: -6.0%; winding ratio: -5.3%; forming winding angle: 32°; cooling plate temperature: 55°C; oiling frequency: 12.5Hz.

[0095] The cationic polyester DTY finally obtained has a linear density CV value of 0.3%, a breaking strength of 2.65 cN / dtex, a breaking strength CV value of 1.9%, a breaking elongation of 23.4%, a breaking elongation CV value of 3.7%, a curl shrinkage rate of 7.4%, a curl shrinkage rate CV value of 4.6%, a curl stability of 67%, a boiling water shrinkage rate of 4.6%, an oil content of 3.0%, and a network degree of 85 pieces / m; the cationic polyester DTY is woven into garters and then dyed with cationic red X-GRL250%, and the dyeing uniformity (gray card) grade is level 4.

Claims

1. A method for preparing cationic polyester DTY, wherein cationic polyester POY is prepared by a texturizing process, and the method is characterized in that: During the texturing process, the surface of the hot box in contact with the filaments is sprayed with a talcum powder suspension; Talc suspension is made by adding talc to water; The mass ratio of talcum powder to water is 2:8 to 5:5; Cationic polyester DTY is woven into garters and then dyed, and the dyeing uniformity is above level 4.

2. The method for preparing a cationic polyester DTY according to claim 1, characterized in that: A wire-traveling passage which passes through the hot box is arranged on the hot box; a talcum powder suspension is sprayed on the bottom of the wire-traveling passage; and a wire strip passes through the wire-traveling passage and contacts the bottom of the wire-traveling passage.

3. The method for preparing a cationic polyester DTY according to claim 2, characterized in that: The mass ratio of talc to water in the talc suspension is 4:

6.

4. The method for preparing a cationic polyester DTY according to claim 3, characterized in that: Evenly spray talcum powder suspension on the bottom of the wire-running channel that runs through the hot box. The spraying amount is 40-60 mL / m 2 .

5. The method for preparing a cationic polyester DTY according to claim 4, characterized in that: The texturing process is as follows: raw wire rack → wire cutter → first roller → upper heating box → cooling plate → false twister → second roller → network device → lower heating box → third roller → wire guide → oiling device → winding device.

6. The method for preparing a cationic polyester DTY according to claim 5, characterized in that: The talcum powder suspension is sprayed on the bottom of the wire-feeding channel arranged on the upper heating box.

7. The method for preparing cationic polyester DTY according to claim 5, characterized in that: The texturing process parameters include: texturing speed: 500-800 m / min; stretching ratio: 1.68-1.75; upper hot box temperature: 160-200°C; lower hot box temperature: 140-160°C; network pressure: 3.4±0.2 bar; false twist ratio: 1.8-2.2; wire drawing ratio: -6--4%; winding ratio: -6--4%; forming winding angle: 28°-32°; cooling plate temperature: 45-60°C; oiling frequency: 5.5-12.5Hz.

8. The method for preparing cationic polyester DTY according to any one of claims 1 to 7, characterized in that: The linear density CV value of cationic polyester DTY is ≤1.5%, the breaking strength is ≥1.8cN / dtex, the breaking strength CV value is ≤5.2%, the breaking elongation is 20±6.0%, the breaking elongation CV value is ≤7.9%, the curl shrinkage is 5.2-7.5%, the curl shrinkage CV value is ≤9.6%, the curl stability is ≥55%, the boiling water shrinkage is 4.5-5.4%, the oil content is 3.5±0.8%, and the network degree is 90±10 pieces / m.