Extinction cationic polyester fiber and preparation method thereof

Abstract

The invention discloses an extinction cationic polyester fiber, which comprises cationic polyester, titanium dioxide, polyethylene and a compatilizer, and the titanium dioxide, the polyethylene and the compatilizer are added in a blending manner. The invention also aims at disclosing a preparation method of the extinction cationic polyester fiber, which comprises the following steps: preparing the compatilizer, drying the cationic polyester, the titanium dioxide master batch, the polyethylene slice and the compatilizer, blending, and carrying out screw melting to obtain an extinction cationic polyester melt; the delustering cationic polyester melt is metered, extruded by a spinneret plate, cooled, oiled and wound to prepare POY (polyester pre-oriented yarn), and the POY is subjected to network, heating stretching, false twisting, heat setting and winding forming to prepare the delustering cationic polyester fiber, namely the delustering cationic DTY. The preparation method disclosed by the invention is good in controllability, and the amount of titanium dioxide is reduced, so that the purposes of stable production and excellent product performance are achieved.

Description

Technical Field

[0001] The invention relates to the technical field of spinning production, in particular to a matte cationic polyester fiber and a preparation method thereof. Background Art

[0002] The production capacity of polyester filament is increasing, but the profits of enterprises are gradually decreasing. The main reason is that most chemical fiber enterprises are still producing conventional varieties and low value-added products, without innovation, and the concept of winning by scale has not changed. With the progress of society and the improvement of living standards, people pursue personalized quality of life, and have more demanding requirements for clothing, comfort, fashion, diversity and taste.

[0003] Since the surface of cationic polyester fiber is relatively transparent, under visible light, the fiber will reflect strong light, making people look dazzling. This light is commonly known as "aurora". In order to improve this phenomenon, adding a matting agent to the fiber can reduce the gloss of the fiber. Adding different amounts of matting agent can obtain different types of fibers such as full matting and semi-matting. In polyester production, titanium dioxide is usually selected as a matting agent to make matting cationic polyester fiber. Matting cationic polyester fiber not only has the natural and soft surface gloss of natural fiber, but also has the functions of sterilization, deodorization, and UV protection. It can be widely used in high-end casual clothing, thermal underwear, etc., and has the advantages of reducing costs, high quality of post-coloring, and good environmental protection.

[0004] However, during the synthesis of cationic polyester, since the sodium sulfonate group on SIPE is an electron-withdrawing group, the positive charge of the two carbonyl carbons increases, which is more conducive to the attack of the hydroxyl oxygen on the hydroxyethyl ester group on the carbonyl carbon, thereby accelerating the self-polymerization process. The spinnability of cationic polyester decreases due to the self-polymerization of SIPE. For matte cationic polyester fibers, a certain amount of titanium dioxide needs to be added. The higher the titanium dioxide content, the better the matte effect, but it causes floating single fibers and broken ends during the spinning process, increasing the difficulty of spinning. How to improve the matte performance of matte cationic polyester fibers while ensuring the quality of matte cationic polyester fibers is of great significance. Therefore, a new technical solution is urgently needed to solve at least one of the above technical problems. Summary of the invention

[0005] In view of the above shortcomings, one object of the present invention is to provide a matte cationic polyester fiber. When polyethylene is added to the cationic polyester, due to the poor compatibility of the two, the polyethylene is dispersed as a dispersed phase in the cationic polyester matrix. There are a certain amount of holes and gaps between the dispersed phase and the matrix, and the fiber presents an opaque state, that is, a matte phenomenon. Another object of the present invention is to disclose a method for preparing a matte cationic polyester fiber, which has good controllability and reduces the amount of titanium dioxide to achieve the purpose of stable production and excellent product performance.

[0006] In order to achieve the above technical objectives and meet the above technical requirements, the technical solution adopted by the present invention is:

[0007] A matte cationic polyester fiber comprises cationic polyester, titanium dioxide, polyethylene and a compatibilizer, wherein the titanium dioxide, polyethylene and the compatibilizer are added in a blending manner.

[0008] As a preferred technical solution, the content of titanium dioxide is 1.0-1.2wt%, the content of polyethylene is 1.0-1.5wt%, and the compatibilizer is polyethylene grafted maleic anhydride, and the content of polyethylene grafted maleic anhydride is 5.0-8.0wt% of the weight of polyethylene.

[0009] The present invention also provides a method for preparing a matte cationic polyester fiber, comprising the following steps:

[0010] The compatibilizer is prepared by drying, blending and screw melting the cationic polyester, titanium dioxide, polyethylene chips and the compatibilizer to obtain a matte cationic polyester melt, metering, spinneret extrusion, cooling, oiling and winding the matte cationic polyester melt to obtain POY yarn, and the POY yarn is networked, heated and stretched, false twisted, heat-set and wound to obtain the matte cationic polyester fiber, i.e., the matte cationic DTY yarn.

[0011] As a preferred technical solution, the intrinsic viscosity of the extinction cationic polyester melt is 0.60-0.65 dL / g, and the melt index of the polyethylene melt is 18-22 g / 10 min.

[0012] As a preferred technical solution, the specific steps for preparing the compatibilizer are as follows:

[0013] After polyethylene, maleic anhydride and initiator are mixed, they are added into an internal mixer in a certain proportion, and granulated by the internal mixer to obtain the compatibilizer, wherein the compatibilizer is polyethylene grafted with maleic anhydride, and the initiator is dibenzoyl peroxide.

[0014] As a preferred technical solution, the weight ratio of polyethylene to maleic anhydride is 100:(3-5), and the content of dibenzoyl peroxide is 0.2-0.3% of the weight of polyethylene.

[0015] As a preferred technical solution, the process parameters for preparing the POY yarn are: the melting temperature of the extinction cationic polyester in the screw is 275-282°C, the temperature of the extinction cationic polyester melt is 281-282°C, the extrusion temperature is 280-285°C, the cooling temperature is 18-20°C, and the winding speed is 2200-2400m / min;

[0016] The process parameters for preparing the DTY yarn are: a winding speed of 580-650 m / min, a first hot box temperature of 165-170°C, a second hot box temperature of 125-130°C, a stretching multiple of 1.68-1.70, and a D / Y of 1.67-1.69. The first hot box is used to heat the POY yarn, and the second hot box is used to heat-set the POY yarn.

[0017] As a preferred technical solution, the temperature of the internal mixer is 160-170°C, the rotation speed is 50-60rpm, and the mixing time is 8-10min.

[0018] As a preferred technical solution, the POY yarn has the following indicators: single yarn fineness is 1.5-3.0 dtex, linear density CV≤1.20%, breaking strength ≥1.60 cN / dtex, breaking strength CV value ≤5.0%, breaking elongation is 130±12.0%, and breaking elongation CV value ≤8.0%;

[0019] The indicators of the DTY yarn are as follows: breaking strength ≥3.20 cN / dtex, breaking strength CV value ≤1.5%, breaking elongation 25±3.0%, breaking elongation CV value ≤5.0%, boiling water shrinkage ≤3.5%, curling shrinkage 9-12%, curling stability 68-72%, and network degree 140-150.

[0020] As a preferred technical solution, the L value of the matte cationic polyester fiber is 88.7-92.6, and the R value is 81.3-82.0.

[0021] Compared with the traditional technical solution, the beneficial effects of the present invention are:

[0022] 1) When polyethylene is added to cationic polyester, due to the poor compatibility between the two, polyethylene is dispersed as a dispersed phase in the cationic polyester matrix. There are a certain amount of holes and gaps between the dispersed phase and the matrix, and the fiber appears opaque, which is the extinction phenomenon.

[0023] 2) The content of titanium dioxide is lower than 2.0%, which avoids the phenomenon of floating single filaments and broken ends due to excessive titanium dioxide content during the spinning process, reducing the difficulty of spinning;

[0024] 3) The preparation method of the matte cationic polyester fiber has good controllability and reduces the amount of titanium dioxide to achieve the purpose of stable production and excellent product performance. DETAILED DESCRIPTION

[0025] The present invention is further described below.

[0026] The same or similar numbers in the embodiments of the present invention correspond to the same or similar parts; in the description of the present invention, it should be understood that if the terms "top", "bottom", "left", "right", "front", "back", "inside", "outside", etc. appear, the orientation or position relationship indicated is the orientation or position relationship shown, which is only for the convenience of describing the present invention, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, the terms describing the position relationship are only used for illustrative purposes and cannot be understood as limitations on this patent. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0027] An embodiment of the present invention provides a matte cationic polyester fiber, wherein the matte cationic polyester includes cationic polyester, titanium dioxide, polyethylene and a compatibilizer, wherein the titanium dioxide, polyethylene and the compatibilizer are added in a blended manner.

[0028] The present invention introduces polyethylene into the cationic polyester. Due to the poor compatibility between the two, the polyethylene is used as a dispersed phase and is dispersed in the cationic polyester matrix. There are a certain amount of holes and gaps between the dispersed phase and the matrix, and the fiber presents an opaque state, i.e., a matte phenomenon, thereby reducing the amount of titanium dioxide and alleviating the influence of self-polymerization, thereby achieving the purpose of stable production and excellent products.

[0029] In some embodiments, the content of titanium dioxide is 1.0-1.2wt%, the content of polyethylene is 1.0-1.5wt%, the compatibilizer is polyethylene grafted maleic anhydride, and the content of polyethylene grafted maleic anhydride is 5.0-8.0wt% of the weight of polyethylene. Titanium dioxide has high opacity, and opacity is caused by the difference in refractive index between titanium dioxide and the surrounding medium. When the refractive index of titanium dioxide is greater than that of polyester, it is opaque. The greater the difference between the two, the stronger the opacity. At the same time, the higher the titanium dioxide content, the better the extinction effect. Generally, the titanium dioxide content must be greater than 2.0wt% to have a good extinction phenomenon. However, too high a titanium dioxide content will cause floating single filaments and broken ends during the spinning process, increasing the difficulty of spinning. The titanium dioxide content of the present invention is only 1.0-1.2wt%. As the amount of titanium dioxide added decreases, floating single filaments and broken ends during the spinning process decrease, and the stability of spinning increases.

[0030] The present invention also provides a method for preparing a matte cationic polyester fiber, comprising the following steps:

[0031] The compatibilizer is prepared by drying, blending and screw melting the cationic polyester, titanium dioxide, polyethylene chips and the compatibilizer to obtain a matte cationic polyester melt, metering, spinneret extrusion, cooling, oiling and winding the matte cationic polyester melt to obtain POY yarn, and the POY yarn is networked, heated and stretched, false twisted, heat-set and wound to obtain the matte cationic polyester fiber, i.e., the matte cationic DTY yarn.

[0032] In some embodiments, the intrinsic viscosity of the extinction cationic polyester melt is 0.60-0.65 dL / g, the polyethylene melt index is 18-22 g / 10 min, and the grafting rate of polypropylene grafted with acrylic acid is 0.8-1.0%.

[0033] In some embodiments, the specific steps of preparing the compatibilizer are as follows:

[0034] After polyethylene, maleic anhydride and initiator are mixed, they are added into an internal mixer in a certain proportion, and granulated by the internal mixer to obtain the compatibilizer, wherein the compatibilizer is polyethylene grafted with maleic anhydride, the initiator is dibenzoyl peroxide, the temperature of the internal mixer is 160-170° C., the rotation speed is 50-60 rpm, the mixing time is 8-10 min, the weight ratio of polyethylene to maleic anhydride is 100:(3-5), and the dibenzoyl peroxide is 0.2-0.3% of the weight of the polyethylene.

[0035] In some embodiments, the process parameters for preparing the POY yarn are: the melting temperature of the extinction cationic polyester in the screw is 275-282° C., the extrusion temperature is 280-285° C., the cooling temperature is 18-20° C., and the winding speed is 2200-2400 m / min;

[0036] The process parameters for preparing the DTY yarn are: a winding speed of 580-650 m / min, a first hot box temperature of 165-170°C, a second hot box temperature of 125-130°C, a stretching multiple of 1.68-1.70, and a D / Y of 1.67-1.69. The first hot box is used to heat the POY yarn, and the second hot box is used to heat-set the POY yarn.

[0037] In some embodiments, the indicators of the POY yarn are: single yarn fineness of 1.5-3.0 dtex, linear density CV≤1.20%, breaking strength ≥1.60 cN / dtex, breaking strength CV value ≤5.0%, breaking elongation 130±12.0%, breaking elongation CV value ≤8.0%; the indicators of the DTY yarn are: breaking strength ≥3.20 cN / dtex, breaking strength CV value ≤1.5%, breaking elongation 25±3.0%, breaking elongation CV value ≤5.0%, boiling water shrinkage ≤3.5%, curling shrinkage 9-12%, curling stability 68-72%, network degree 140-150, network degree refers to the network points per unit length, which prevents the fiber from loosening and is conducive to winding and weaving.

[0038] In some embodiments, the L value of the extinction cationic polyester fiber is 88.7-92.6, and the R value is 81.3-82.0. Polyethylene belongs to polyolefin polymers, which is a polymer with relatively low relative density, soft hand feel, good elasticity and thermal stability. Due to the differences in polarity and chemical structure, polyethylene and cationic polyester are typical incompatible polymers. When a certain amount of polyethylene is added to the cationic polyester, due to the poor compatibility of the two, polyethylene, as a dispersed phase, is dispersed in the cationic polyester matrix, and there are a certain amount of holes and gaps between the dispersed phase and the cationic polyester matrix. At the same time, there is a difference in the refractive index of polyethylene and cationic polyester, which is 1.55-1.60 for cationic polyester and 1.49-1.52 for polyethylene. When light passes through the cationic polyester and encounters the interface of polyethylene and the cationic polyester, the light is refracted and the fiber presents an opaque state, i.e., extinction phenomenon.

[0039] The interface layer between the two phases of the blend often determines the performance of the polymer. Good compatibility makes the microscopic morphology of the blend more stable, makes the dispersion of the microphase better, and then makes the blend have excellent macroscopic performance. Although adding a certain amount of polyethylene to cationic polyester makes the fiber present extinction phenomenon, it will also have a certain impact on the fiber performance. In order to reduce this adverse effect, it is mainly solved from two aspects. One is to control the addition amount of polyethylene at 1.0-1.5%, and the other is to introduce polyethylene grafted maleic anhydride (PE-MAH). The introduction of polyethylene grafted maleic anhydride greatly improves the compatibility, significantly reduces holes and gaps, and the dispersed phase size becomes smaller and the distribution becomes more and more uniform. The adhesion of the corresponding mixed interface becomes better, the interfacial tension is reduced, the phase morphology is stable, and the mechanical properties are better. At the same time, the introduction of polyethylene grafted maleic anhydride improves the compatibility of polyethylene and polyethylene terephthalate (PET), but the extinction effect of polyethylene on cationic polyester does not decrease significantly, and it also reduces the impact of cationic polyester self-polymerization.

[0040] Introducing a certain amount of polyethylene into cationic polyester can play a matting role. The compatibilizer PE-g-MAH reduces the interfacial tension, increases the adhesion between the two phases, improves the dispersion effect of the dispersed phase, and significantly improves the microstructure of the blend.

[0041] In the processing of matte cationic DTY yarn, the quality of the product is improved by reducing the stretching ratio, increasing D / Y, lowering the temperature of the first hot box, and eliminating static electricity on the original yarn during the processing.

[0042] Example 1

[0043] A matte cationic polyester fiber, the matte cationic polyester comprises cationic polyester, titanium dioxide, polyethylene and a compatibilizer, the titanium dioxide, polyethylene and the compatibilizer are added in a blending manner, the content of titanium dioxide is 1.0wt%, the content of polyethylene is 1.0wt%, the compatibilizer is polyethylene grafted maleic anhydride, and the content of polyethylene grafted maleic anhydride is 5.0wt% of the weight of polyethylene.

[0044] The present invention also provides a method for preparing a matte cationic polyester fiber, comprising the following steps:

[0045] The compatibilizer is prepared by drying, blending and screw melting the cationic polyester, titanium dioxide, polyethylene chips and the compatibilizer to obtain a matte cationic polyester melt, metering, spinneret extrusion, cooling, oiling and winding the matte cationic polyester melt to obtain POY yarn, and the POY yarn is networked, heated and stretched, false twisted, heat-set and wound to obtain the matte cationic polyester fiber, i.e., the matte cationic DTY yarn.

[0046] The intrinsic viscosity of the extinction cationic polyester melt is 0.60 dL / g, and the melt index of the polyethylene melt is 18 g / 10 min.

[0047] The specific steps of preparing the compatibilizer are as follows:

[0048] After polyethylene, maleic anhydride and initiator are mixed, they are added into an internal mixer in a certain proportion, and granulated by the internal mixer to obtain the compatibilizer, wherein the compatibilizer is polyethylene grafted with maleic anhydride, the initiator is dibenzoyl peroxide, the weight ratio of polyethylene to maleic anhydride is 100:3, the dibenzoyl peroxide is 0.2% of the weight of polyethylene, the temperature of the internal mixer is 160°C, the rotation speed is 50rpm, and the mixing time is 8min.

[0049] The process parameters for preparing the POY yarn are as follows: the melting temperature of the extinction cationic polyester in the screw is 275° C., the extrusion temperature is 280° C., the cooling temperature is 18° C., and the winding speed is 2200 m / min;

[0050] The process parameters for preparing the DTY yarn are: winding speed of 580 m / min, first hot box temperature of 165°C, second hot box temperature of 125°C, stretching ratio of 1.68, D / Y of 1.67, the first hot box is used to heat the POY yarn, and the second hot box is used to heat-set the POY yarn.

[0051] The POY yarn has the following indicators: single yarn fineness is 1.5 dtex, linear density CV is 1.11%, breaking strength is 1.95 cN / dtex, breaking strength CV value is 4.9%, breaking elongation is 132%, and breaking elongation CV value is 7.22%;

[0052] The indicators of the DTY yarn are as follows: breaking strength 3.38 cN / dtex, breaking strength CV value 1.32%, breaking elongation 25.4%, breaking elongation CV value 4.87%, boiling water shrinkage 3.32%, curling shrinkage 9%, curling stability 68%, network degree 140, and the L value of the matte cationic polyester fiber is 88.7 and the R value is 81.3.

[0053] Example 2

[0054] A matte cationic polyester fiber, the matte cationic polyester comprises cationic polyester, titanium dioxide, polyethylene and a compatibilizer, the titanium dioxide, polyethylene and the compatibilizer are added in a blended manner, the content of titanium dioxide is 1.1wt%, the content of polyethylene is 1.3wt%, the compatibilizer is polyethylene grafted maleic anhydride, and the content of polyethylene grafted maleic anhydride is 6wt% of the weight of polyethylene.

[0055] The present invention also provides a method for preparing a matte cationic polyester fiber, comprising the following steps:

[0056] The compatibilizer is prepared by drying, blending and screw melting the cationic polyester, titanium dioxide masterbatch, polyethylene chips and the compatibilizer to obtain a matte cationic polyester melt, metering, spinneret extrusion, cooling, oiling and winding the matte cationic polyester melt to obtain POY yarn, and the POY yarn is networked, heated and stretched, false twisted, heat-set and wound to obtain the matte cationic polyester fiber, i.e., the matte cationic DTY yarn.

[0057] The intrinsic viscosity of the extinction cationic polyester melt is 0.62 dL / g, and the melt index of the polyethylene melt is 19 g / 10 min.

[0058] The specific steps of preparing the compatibilizer are as follows:

[0059] After polyethylene, maleic anhydride and initiator are mixed, they are added into an internal mixer in a certain proportion, and granulated by the internal mixer to obtain the compatibilizer, wherein the compatibilizer is polyethylene grafted with maleic anhydride, the initiator is dibenzoyl peroxide, the weight ratio of polyethylene to maleic anhydride is 100:4, the dibenzoyl peroxide is 0.25% of the weight of polyethylene, the temperature of the internal mixer is 165° C., the rotation speed is 55 rpm, and the mixing time is 9 minutes.

[0060] The process parameters for preparing the POY yarn are as follows: the melting temperature of the extinction cationic polyester in the screw is 278° C., the extrusion temperature is 283° C., the cooling temperature is 19° C., and the winding speed is 2300 m / min;

[0061] The process parameters for preparing the DTY yarn are: winding speed of 600m / min, first hot box temperature of 168°C, second hot box temperature of 126°C, stretching ratio of 1.69, D / Y of 1.68, the first hot box is used to heat the POY yarn, and the second hot box is used to heat-set the POY yarn.

[0062] The indicators of the POY yarn are as follows: single yarn fineness is 2 dtex, linear density CV is 1.08%, breaking strength is 1.97 cN / dtex, breaking strength CV value is 4.82%, breaking elongation is 128%, and breaking elongation CV value is 7.05%;

[0063] The indicators of the DTY yarn are as follows: breaking strength 3.51 cN / dtex, breaking strength CV value 1.42%, breaking elongation 26.6%, breaking elongation CV value 4.75%, boiling water shrinkage 3.27%, curling shrinkage 10%, curling stability 70%, network degree 145, and the L value of the matte cationic polyester fiber is 90.3 and the R value is 81.5.

[0064] Example 3

[0065] A matte cationic polyester fiber, the matte cationic polyester comprises cationic polyester, titanium dioxide, polyethylene and a compatibilizer, the titanium dioxide, polyethylene and the compatibilizer are added in a blended manner, the content of titanium dioxide is 1.2wt%, the content of polyethylene is 1.5wt%, the compatibilizer is polyethylene grafted maleic anhydride, and the content of polyethylene grafted maleic anhydride is 8.0wt% of the weight of polyethylene.

[0066] The present invention also provides a method for preparing a matte cationic polyester fiber, comprising the following steps:

[0067] The compatibilizer is prepared by drying, blending and screw melting the cationic polyester, titanium dioxide masterbatch, polyethylene chips and the compatibilizer to obtain a matte cationic polyester melt, metering, spinneret extrusion, cooling, oiling and winding the matte cationic polyester melt to obtain POY yarn, and the POY yarn is networked, heated and stretched, false twisted, heat-set and wound to obtain the matte cationic polyester fiber, i.e., the matte cationic DTY yarn.

[0068] The intrinsic viscosity of the extinction cationic polyester melt is 0.65 dL / g, and the melt index of the polyethylene melt is 22 g / 10 min.

[0069] The specific steps of preparing the compatibilizer are as follows:

[0070] After polyethylene, maleic anhydride and initiator are mixed, they are added into an internal mixer in a certain proportion, and granulated by the internal mixer to obtain the compatibilizer, wherein the compatibilizer is polyethylene grafted with maleic anhydride, the initiator is dibenzoyl peroxide, the weight ratio of polyethylene to maleic anhydride is 100:5, the dibenzoyl peroxide is 0.3% of the weight of polyethylene, the temperature of the internal mixer is 170°C, the rotation speed is 60rpm, and the mixing time is 10min.

[0071] The process parameters for preparing the POY yarn are as follows: the melting temperature of the extinction cationic polyester in the screw is 282° C., the extrusion temperature is 285° C., the cooling temperature is 20° C., and the winding speed is 2400 m / min;

[0072] The process parameters for preparing the DTY yarn are: winding speed of 650m / min, first hot box temperature of 170°C, second hot box temperature of 130°C, stretching ratio of 1.70, D / Y of 1.69, the first hot box is used to heat the POY yarn, and the second hot box is used to heat-set the POY yarn.

[0073] The POY yarn has the following indicators: single yarn fineness is 3.0 dtex, linear density CV is 1.08%, breaking strength is 2.08 cN / dtex, breaking strength CV value is 4.76%, breaking elongation is 125%, and breaking elongation CV value is 7.22%;

[0074] The indicators of the DTY yarn are as follows: breaking strength 3.48 cN / dtex, breaking strength CV value 1.36%, breaking elongation 28%, breaking elongation CV value 4.68%, boiling water shrinkage 3.36%, curling shrinkage 12%, curling stability 72%, network degree 150, and the L value of the matte cationic polyester fiber is 92.6 and the R value is 82.0.

[0075] The L value represents the transmittance of light, and the R value represents the reflection of light. The extinction cationic polyester fibers of Examples 1, 2 and 3 have good light absorption and diffuse reflection properties, good extinction effects, low titanium dioxide content, and excellent mechanical properties of the extinction cationic polyester fibers.

[0076] Any numerical value cited herein includes all values ​​of lower and upper values ​​that increase by one unit from the lower limit to the upper limit, and there is at least a two-unit interval between any lower value and any higher value. For example, if the value of the quantity of a component or a process variable (such as temperature, pressure, time, etc.) is stated to be from 1 to 90, preferably from 20 to 80, and more preferably from 30 to 70, the purpose is to illustrate that values ​​such as 15 to 85, 22 to 68, 43 to 51, 30 to 32 are also explicitly listed in the specification. For values ​​less than 1, one unit is appropriately considered to be 0.0001, 0.001, 0.01, 0.1. These are merely examples that are intended to be clearly expressed, and it can be considered that all possible combinations of numerical values ​​listed between the lowest value and the highest value are clearly stated in the specification in a similar manner.

[0077] Unless otherwise indicated, all ranges include the endpoints and all numbers between the endpoints. "About" or "approximately" used with a range applies to both endpoints of the range. Thus, "about 20 to 30" is intended to cover "about 20 to about 30", including at least the specified endpoints.

[0078] All articles and references disclosed, including patent applications and publications, are incorporated herein by reference for all purposes. The term "consisting essentially of..." to describe a combination should include the identified elements, ingredients, parts or steps and other elements, ingredients, parts or steps that do not substantially affect the basic novel characteristics of the combination. The use of the terms "comprising" or "including" to describe a combination of elements, ingredients, parts or steps herein also contemplates embodiments that consist essentially of these elements, ingredients, parts or steps. By using the term "may", it is intended to indicate that any attribute described that "may" include is optional.

[0079] Multiple elements, ingredients, parts or steps can be provided by a single integrated element, ingredient, part or step. Alternatively, a single integrated element, ingredient, part or step can be divided into separate multiple elements, ingredients, parts or steps. The disclosure "one" or "an" used to describe an element, ingredient, part or step is not intended to exclude other elements, ingredients, parts or steps.

[0080] It should be understood that the above description is for illustration and not for limitation. Many embodiments and many applications beyond the examples provided will be apparent to those skilled in the art upon reading the above description. Therefore, the scope of the present teachings should not be determined with reference to the above description, but should be determined with reference to the appended claims and the full scope of equivalents possessed by such claims. For the purpose of comprehensiveness, all articles and references, including disclosures of patent applications and publications, are incorporated herein by reference. The omission of any aspect of the subject matter disclosed herein in the preceding claims is not intended to be a waiver of the subject matter, nor should it be considered that the inventors did not consider the subject matter to be part of the disclosed inventive subject matter.

Claims

1. A matte cationic polyester fiber, characterized in that: The extinction cationic polyester comprises cationic polyester, titanium dioxide, polyethylene and a compatibilizer, and the titanium dioxide, polyethylene and the compatibilizer are added in a blending manner.

2. The matte cationic polyester fiber according to claim 1, characterized in that: The content of titanium dioxide is 1.0-1.2wt%, the content of polyethylene is 1.0-1.5wt%, and the compatibilizer is polyethylene grafted maleic anhydride, and the content of polyethylene grafted maleic anhydride is 5.0-8.0wt% of the weight of polyethylene.

3. The method for preparing the matte cationic polyester fiber according to any one of claims 1 to 2, characterized in that: The following steps are involved: The compatibilizer is prepared by drying, blending and screw melting the cationic polyester, titanium dioxide, polyethylene chips and the compatibilizer to obtain a matte cationic polyester melt, metering, spinneret extrusion, cooling, oiling and winding the matte cationic polyester melt to obtain POY yarn, and the POY yarn is networked, heated and stretched, false twisted, heat-set and wound to obtain the matte cationic polyester fiber, i.e., the matte cationic DTY yarn.

4. The matte cationic polyester fiber according to claim 3, characterized in that: The intrinsic viscosity of the extinction cationic polyester melt is 0.60-0.65 dL / g, and the melt index of the polyethylene melt is 18-22 g / 10 min.

5. The method for preparing the matte cationic polyester fiber according to claim 3, characterized in that: The specific steps of preparing the compatibilizer are as follows: After polyethylene, maleic anhydride and initiator are mixed, they are added into an internal mixer in a certain proportion, and granulated by the internal mixer to obtain the compatibilizer, wherein the compatibilizer is polyethylene grafted with maleic anhydride, and the initiator is dibenzoyl peroxide.

6. The method for preparing the matte cationic polyester fiber according to claim 5, characterized in that: The weight ratio of polyethylene to maleic anhydride is 100:(3-5), and the content of dibenzoyl peroxide is 0.2-0.3% of the weight of polyethylene.

7. The method for preparing the matte cationic polyester fiber according to claim 6, characterized in that: The process parameters for preparing the POY yarn are as follows: the melting temperature of the extinction cationic polyester in the screw is 275-282° C., the extrusion temperature is 280-285° C., the cooling temperature is 18-20° C., and the winding speed is 2200-2400 m / min; The process parameters for preparing the DTY yarn are: a winding speed of 580-650 m / min, a first hot box temperature of 165-170°C, a second hot box temperature of 125-130°C, a stretching multiple of 1.68-1.70, and a D / Y of 1.67-1.

69. The first hot box is used to heat the POY yarn, and the second hot box is used to heat-set the POY yarn.

8. The method for preparing the matte cationic polyester fiber according to claim 5, characterized in that: The temperature of the internal mixer is 160-170° C., the rotation speed is 50-60 rpm, and the mixing time is 8-10 min.

9. The method for preparing the matte cationic polyester fiber according to claim 3, characterized in that: The POY yarn has the following indicators: single yarn fineness of 1.5-3.0 dtex, linear density CV≤1.20%, breaking strength ≥1.60 cN / dtex, breaking strength CV value ≤5.0%, breaking elongation of 130±12.0%, breaking elongation CV value ≤8.0%; The indicators of the DTY yarn are as follows: breaking strength ≥3.20 cN / dtex, breaking strength CV value ≤1.5%, breaking elongation 25±3.0%, breaking elongation CV value ≤5.0%, boiling water shrinkage ≤3.5%, curling shrinkage 9-12%, curling stability 68-72%, and network degree 140-150.

10. The method for preparing the matte cationic polyester fiber according to claim 3, characterized in that: The L value of the matte cationic polyester fiber is 88.7-92.6, and the R value is 81.3-82.0.