TW202242214A - Chemical fibre material made of mixed polyester - Google Patents

Abstract

A chemical fibre material made of at least one polyester and at least one other polyester, a preparation method, and an application thereof. The chemical fibre material has desirable physical characteristics such as good dyeing properties and a good hand feel, and is industrially feasible and low cost. The present application also relates to a fabric and/or other product made of the chemical fibre material.

Description

A chemical fiber material made of blended polyester

The application relates to a chemical fiber material made of mixed polyester, its preparation method and its application. The chemical fiber material uses at least one polyester and at least another polyester as raw materials, and different polyesters are physically mixed before spinning to form a mixed polyester chemical fiber material. The present application also relates to yarns, fabrics and/or other articles made of the above-mentioned chemical fiber materials.

When polyester is used as a textile material, in order to ensure the uniformity of spinning quality, the polyester with a single composition is usually pursued, and the mixing of different polyesters is avoided as much as possible. Because it is generally believed that the physical mixing of different polyesters will have a negative impact on the uniformity of the fiber, which in turn will affect the characteristics of the chemical fiber material, such as dyeing properties.

Common polyester textile materials, such as polytrimethylene terephthalate (PTT), polyethylene terephthalate (PET), polybutylene terephthalate (PBT), etc., which can be used alone Or made into yarn with other chemical fiber materials, it is widely used in textiles and other end uses.

Some polyester textile materials, such as polytrimethylene terephthalate (PTT), are more difficult to dye. Polytrimethylene terephthalate is usually dyed with disperse dyes. Commonly, the dyeing of polypropylene terephthalate fibers needs to be carried out under high temperature and high pressure conditions, such as 130°C.

technical problem

Different textile materials require different process conditions for dyeing. Some polyesters, such as polypropylene terephthalate, need to be dyed under high temperature and pressure conditions. Other common materials, such as wool, are dyed under normal pressure. Therefore, if it is desired to use polytrimethylene terephthalate fibers and other fibers dyed under normal pressure conditions in fabrics, it is difficult to dye them. In particular, when polypropylene terephthalate fibers are mixed with wool, sweater factories usually do not have pressurized high-temperature dyeing vats, and adding pressurized equipment will lead to a substantial increase in costs.

In addition, in order to meet the high temperature and pressure conditions required for the dyeing of polypropylene terephthalate fibers, the fibers may be damaged during high temperature and high pressure processing, which will affect other properties including softness and body bone. . In particular, when polytrimethylene terephthalate fiber is mixed with other fiber materials such as wool and nylon, the higher temperature and pressure required for dyeing polytrimethylene terephthalate fiber will seriously damage other fibers The texture of the material (such as wool, nylon, etc.) causes problems such as the deterioration of the softness of the fabric and affects the feel.

Therefore, there is a need for a chemical fiber material, especially an aromatic polyester material, which can be dyed under mild dyeing conditions and has good dyeing properties. It is also desired that the other properties of the chemical fiber, such as strength, body, dimensional stability, etc. are not deteriorated or performed better. Technical solutions

The present application provides a chemical fiber material, which uses at least one polyester and at least the other polyester as raw materials, and physically mixes the at least one polyester and the at least another polyester before spinning.

Preferably, the at least one polyester is an aromatic polyester; more preferably, the aromatic polyester is polyalkylene terephthalate; further preferably, the polyalkylene terephthalate The diacid ester is polytrimethylene terephthalate.

Preferably, said at least one other polyester is also an aromatic polyester; more preferably, said aromatic polyester is polyalkylene terephthalate; further preferably, said polyalkylene The terephthalate is polybutylene terephthalate.

The aromatic polyesters described in this application refer to those polyesters containing aromatic rings in their main chain or side chains, for example: polyethylene terephthalate (PET), polyethylene terephthalate Propylene glycol diformate (PPT), butylene terephthalate (PBT), polyhexamethylene terephthalate (PHT), etc.

Preferably, the one polyester and the at least one other polyester are physically mixed in a ratio of 1/99 to 99/1; more preferably, the one polyester and the at least one other polyester are mixed in a ratio of 10/90 to 90/1 A ratio of 10 is physically mixed; more preferably, a polyester is physically mixed with the at least another polyester in a ratio of 20/80 to 80/20; more preferably, a polyester is mixed with the at least another polyester in a ratio of 20/80 to 80/20; The ratio of 30/70~70/30 is physically mixed; more preferably, one polyester is physically mixed with the at least one other polyester in a ratio of 40/60~60/40.

Preferably, polytrimethylene terephthalate is physically mixed with said at least one other polyester in a ratio of 1/99 to 99/1; more preferably, polytrimethylene terephthalate and said at least one other polyester are mixed in a ratio of 1/99 to 99/1; The ratio of 10/90~90/10 is physically mixed; more preferably, poly(trimethylene terephthalate) is physically mixed with the at least one other polyester in a ratio of 20/80~80/20; more preferably, poly(trimethylene terephthalate) Propylene glycol phthalate and the at least one other polyester are physically mixed in a ratio of 30/70 to 70/30; more preferably, polytrimethylene terephthalate and the at least one other polyester are mixed in a ratio of 40/60 to 70/30. 60/40 ratio physical mix.

Preferably, polytrimethylene terephthalate is physically mixed with said at least one other polyalkylene terephthalate in a ratio of 1/99 to 99/1; more preferably, polytrimethylene terephthalate is mixed with said at least one other polyalkylene terephthalate The at least one other polyalkylene terephthalate is physically mixed in a ratio of 10/90 to 90/10; more preferably, polytrimethylene terephthalate and the at least one other polyalkylene terephthalate The acid ester is physically mixed in a ratio of 20/80 to 80/20; more preferably, polytrimethylene terephthalate and the at least one other polyalkylene terephthalate are mixed in a ratio of 30/70 to 70/30 The ratio is physically mixed; more preferably, the polytrimethylene terephthalate and the at least one other polyalkylene terephthalate are physically mixed in a ratio of 40/60 to 60/40.

Preferably, polytrimethylene terephthalate and polybutylene terephthalate are physically mixed in a ratio of 1/99 to 99/1; more preferably, polytrimethylene terephthalate and polybutylene terephthalate Glycol esters are physically mixed in a ratio of 10/90 to 90/10; more preferably, polytrimethylene terephthalate and polybutylene terephthalate are physically mixed in a ratio of 20/80 to 80/20; More preferably, polytrimethylene terephthalate and polybutylene terephthalate are physically mixed in a ratio of 30/70 to 70/30; more preferably, polytrimethylene terephthalate and polybutylene terephthalate Butylene glycol formate is physically mixed in a ratio of 40/60~60/40.

Preferably, poly(trimethylene terephthalate) and said at least one other polyalkylene terephthalate are mixed in ratios of 10/90, 30/70, 20/80, 40/60, 50/50, 60/40 , 70/30, 80/20 or 90/10 ratio physical mixing; particularly preferably, polytrimethylene terephthalate and polybutylene terephthalate with 10/90, 30/70, 20/80 , 40/60, 50/50, 60/40, 70/30, 80/20 or 90/10 ratio physical mixing.

The manmade fiber materials described herein that contain one polyester and at least one other polyester may also contain other ingredients, including but not limited to a third or more polyesters, other polyester additives, unless they would detract from Advantages of this application. The additives, such as matting agent (such as titanium dioxide), heat stabilizer, antioxidant, antistatic agent, ultraviolet light absorber, antibacterial agent, or various pigments, or other functional additives.

On the other hand, the chemical fiber material containing a polyester and at least one other polyester described in the present application may contain an aliphatic polyester, such as polylactic acid, and at least one other polyester, such as an aromatic polyester, and then Improve the performance of chemical fiber materials, such as dyeing performance.

The present application also provides a method for the preparation of a textile material mixed with different polyesters, using at least one polyester, such as polytrimethylene terephthalate, and at least one other polyester, such as polybutylene terephthalate As raw materials, different polyesters are physically mixed, and the resulting mixed material is made into a chemical fiber material. Specifically, the obtained mixed material is heated and extruded to obtain a melt of the mixed material. The melt of the mixed material can be further processed into a mixed polyester chemical fiber material through a spinning assembly.

The method for obtaining the mixed polyester chemical fiber material of the present application is not particularly limited. For example, different polyesters can be (1) pre-blended in a separate unit, followed by heat and extrusion treatment, (2) mixed simultaneously with heat and extrusion treatment.

In a preferred embodiment, the one polyester, such as polytrimethylene terephthalate, and at least one other polyester, such as polybutylene terephthalate, are in polyester pellets ("polyester pellets") "Pellets" are not intended to limit the shape, "Pellets" include products called "chips", "flakes", etc.), physical mixing is carried out in the following manner, during the process of conveying the different polyester pellets to the silo physical mixing. Thereafter, the mixed material is heated, extruded, and the melt is passed through a spinning element, such as a spinneret, to produce a mixed polyester chemical fiber material.

In a preferred embodiment, the one polyester, such as polytrimethylene terephthalate, is physically mixed with at least one other polyester, such as polybutylene terephthalate, at different The polyester pellets are physically mixed during the process of transporting the polyester pellets from the silo to the feed port of the extruder, and the physical mixing can occur before or after the polyester is dried. Thereafter, the mixed material is heated and extruded, and the melt is passed through a spinning assembly to make a mixed polyester chemical fiber material.

In a preferred embodiment, the one polyester, such as polytrimethylene terephthalate, is physically mixed with at least one other polyester, such as polybutylene terephthalate, in such a manner that one polyester Pellets are normally fed, and at least one other polyester pellet is side-fed into the extrusion system for physical mixing. After heating and extruding, the melt of the mixed material passes through the spinning unit to make a mixed polyester chemical fiber material.

The heating and extrusion temperature is generally lower than about 300°C, preferably about 245-260°C.

The mixed polyester chemical fiber material can be long fiber, short fiber and/or other materials.

The mixed polyester filaments can be single-component filaments with uniform components, and/or form multi-component composite fibers together with other fiber material yarns, such as bicomponent composite filaments. The composite fiber may be, for example, a side-by-side composite fiber, an island-in-the-sea composite fiber, and/or a chrysanthemum composite fiber. The mixed polyester can be used as an integral part of the fiber to form a composite fiber together with PET, such as a side-by-side composite fiber.

The mixed polyester staple fiber material can be made into yarn alone and/or blended with other fiber materials to make yarn.

The mixed polyester chemical fiber material can be further made into fabric and/or other products.

In a preferred embodiment, the mixed polyester chemical fiber material comprising poly(trimethylene terephthalate) and at least one other polyalkylene terephthalate is staple fiber, which is further combined with wool or other fibers such as Cotton, viscose fiber, nylon, polyacrylonitrile fiber (acrylic fiber), etc. are blended to make a fabric together.

In a preferred embodiment, said blended polyester chemical fiber material comprising polytrimethylene terephthalate and at least one other polyalkylene terephthalate is made into a fully drawn filament yarn (FDY), or Semi-drawn yarn (POY), or stretched textured yarn (DTY), or other forms of yarn, further chemical fiber materials are spun together with other materials to form composite fibers. In a preferred embodiment, the fully extended filament yarn containing mixed polyester chemical fiber and the stretch-textured yarn of polyethylene terephthalate are made into a two-component composite in a ratio of 50/50 filament.

The present application also relates to fabrics and/or other articles comprising the textile materials described above. Fabrics can be knitted, woven and nonwoven (nonwoven).

The present application also relates to a method for dyeing textile materials, the method comprising adding at least one polyester to at least one polyester by physical mixing as a raw material, the at least one polyester and the at least another polyester being physically mixed A mixed material is obtained, the melt of the mixed material is made into a textile material, and then the textile material is dyed at a temperature lower than 130° C. under normal pressure. Preferably, the dyeing process can be performed at 90°C-100°C by using the method of the present application, such as 95°C.

In a preferred embodiment, the method for dyeing textile materials comprises adding at least one further polyester as raw material to polytrimethylene terephthalate by physical mixing. Preferably said at least one further polyester is polyalkylene terephthalate, more preferably it is polybutylene terephthalate. Beneficial effect

One advantage of the present application is that, although the chemical fiber material described in the present application physically mixes different polyesters, surprisingly, it can still obtain a melt with good uniformity, and can produce uniform fibers, with Good processability.

The chemical fiber material described in this application has low raw material cost and processing cost, can be dyed at relatively low temperature and normal pressure, has better color after dyeing, stronger coloring power and better color fastness.

Another advantage of the present application is that the chemical fiber material described in the present application and the textile material comprising the chemical fiber material also have excellent physical properties, such as softness and smoothness, good body and bone, and stable dimensions. Good resistance, and not easy to pilling.

The dyeing of the chemical fiber materials described in this application can be completed at relatively low temperature and normal pressure, without the use of pressurized equipment, lower requirements for equipment, greatly saving costs, and having better safety.

While not wishing to be bound by any theory, it is believed that the physical mixing of different polyester materials can affect the crystallinity of the polyester materials, thereby enabling superior dyeing results under milder conditions.

At the same time, the chemical fiber material of the present application has a lower oligomer content, which can improve the problem of too many cyclic dimers and pollute processing equipment when using polytrimethylene terephthalate alone, and has good processing feasibility sex.

In addition, this application only needs to carry out simple physical mixing of different polyester particles in the spinning production. In addition to spinning, no additional melt blending processing steps are required for different polyesters, which further facilitates the simplification of the manufacturing process and reduces the cost. It also avoids the damage to textile materials caused by the high temperature and high pressure dyeing process.

In the absence of indications to the contrary, "polytrimethylene terephthalate" (PTT) is meant to include homopolymers and copolymers containing at least 70% molar repeating units of trimethylene terephthalate and Polymer compositions of homopolymers or copolyesters. Preferred polytrimethylene terephthalates contain at least 85% molar, more preferably at least 90% molar, even more preferably at least 95% molar or at least 98% molar, most preferably about 100% molar Propylene glycol phthalate repeat unit. The 1,3-propanediol used in the manufacture of PTT is preferably biochemically obtained from renewable resources. Commercially available polytrimethylene terephthalate resins include, but are not limited to, DuPont's SORONA ^® .

The intrinsic viscosity range of the polypropylene terephthalate used in the present application is preferably 0.7-1.3 dL/g.

Intrinsic viscosity (IV) is a measure of the molecular weight of a polymer and can be measured according to ASTM D 5225. Intrinsic viscosity generally increases with polymer molecular weight, but also depends on the type of polymer, its shape or conformation, and the solvent used for the measurement.

In the absence of indications to the contrary, "polyethylene terephthalate" (PET) is meant to include homopolymers and copolymers containing at least 70% molar repeating units of polyethylene terephthalate and A polymer composition of at least 70% molar homopolymer or copolyester. Preferred polyethylene terephthalates contain at least 85% molar, more preferably at least 90% molar, even more preferably at least 95% molar or at least 98% molar, most preferably about 100% molar of ethylene terephthalate repeating units.

In the absence of indications to the contrary, "polybutylene terephthalate" (PBT) is meant to include homopolymers and copolymers containing at least 70% molar repeating units of butylene terephthalate and A polymer composition of at least 70% molar homopolymer or copolyester. Preferred polybutylene terephthalates contain at least 85% molar, more preferably at least 90% molar, even more preferably at least 95% molar or at least 98% molar, most preferably about 100% molar Butylene terephthalate repeating unit.

For convenience, when "PTT", "PBT" or "PET" is mentioned in the text, it refers to polytrimethylene terephthalate, polybutylene terephthalate or polyethylene terephthalate, respectively. Glycol esters.

Polyester, for example the manufacture method of polytrimethylene terephthalate, polybutylene terephthalate or polyethylene terephthalate is well known to those skilled in the art, for the sake of brevity, in this description further description is omitted.

The term "yarn" refers to a continuous bundle of twisted threads of natural or synthetic material, such as wool, nylon, or polyester, used for weaving or weaving. Yarns, such as fully drawn yarns (FDY), semi-drawn yarns (POY), set yarns (SAY), stretch textured yarns (DTY), air-twisted processed yarns (ATY), Composite fibers and blended yarns, etc.

All percentages, parts, ratios, etc., are by weight unless otherwise indicated. Preparation of chemical fiber materials

Unless otherwise indicated, the samples and controls in the examples were prepared as follows.

The preparation of spinning includes at least one kind of polyester pellets, such as PTT polyester chips, and at least one other polyester pellets, such as PBT polyester chips, in different proportions, such as 10/90, 20/80, 30/70, 40/60, 50/50, 60/40, 70/40, 80/20 and 90/10, put into the feeding port of the screw extruder after physical mixing. After the material is sheared and melted in the extruder, a mixed polyester melt, such as PTT/PBT mixed polyester melt, is obtained, and the mixed polyester melt is transported to the spinning assembly by a pump.

The mixed polyester melt can be passed through the spinning unit separately, bundled into sliver and made into long fiber, or cut into short fiber.

The mixed polyester melt can also be made into composite fibers together with melts of other polyester fiber materials. At this time, at least two extruders are used. For example, in one of the extruders, using the method described above, at least one polyester pellet, such as PTT polyester chips, and at least one other polyester pellet, such as PBT polyester chips, are physically mixed in different proportions. Then put it into the feeding port of the screw extruder. After the material is sheared and melted in the extruder, a uniformly mixed polyester melt, such as PTT/PBT mixed polyester melt, is obtained. In another extruder, use another or more polyester pellets, such as PET polyester chips, and put them into the feed port of the screw extruder. After the material is sheared and melted in the extruder, a uniform polyester pellet is obtained. Melts, such as PET polyester melts. The obtained mixed polyester melt and the single polyester melt are further co-passed through a spinning element to form a composite fiber, such as a bicomponent composite filament.

The preparation of the reference substance is basically the same as the above method, the difference is that when preparing the mixed polyester melt, different kinds of polyesters through physical mixing are used as feed materials, while when preparing the reference substance, only one kind of polyester is used as the feed material alone. For example, PTT polyester chips are used alone and put into the feed port of the screw extruder. After the single polyester material is sheared and melted in the extruder, a polyester melt of the reference substance is obtained, and a pump is used to transport the polyester melt of the reference substance to the spinning assembly.

The polyester melt of the reference substance can pass through the spinning assembly alone, and then be bundled into long fibers, or cut into short fibers. The reference polyester melt can also use the above method to make composite fibers together with melts of other polyester fiber materials. Characterization of basic physical properties

Unless otherwise indicated, the corresponding parameters of the samples and reference substances in the examples were determined according to the following methods.

The breaking strength ("Tenacity @ break / cN/dtex"), elongation at break ("Elongation @ break / %") and Young's modulus (Young's Modulus / cN) of the samples were tested using GB/T14344-2008 method.

Use the following method to test the fiber boiling shrinkage %. Take a certain length of fiber, tie a knot at the end, hang the weight to measure the length, then put it in boiling water at 95-100 ° C for 30 minutes, take it out and dry it, then measure the length again. Calculate the shrinkage rate, that is, the fiber boiling shrinkage %.

Shrinkage (%) was measured using AATCC 135 method.

The ASTMD3107 method was used to measure the elongation of the sample under force ("Fabric stretch /%"); after the fabric was dyed, the ASTMD3107 method was used to measure the elasticity after dyeing (Stretch after dyeing /%).

The degree of curl was measured by the following method. Take the sample and the reference substance, take off the thread that has been taken, and tie a knot at the head and tail. Then add 7.5g (for example, for 5550dtex thread) initial load on the bottom of the thread, measure the initial length Cb, accurate to 1mm. Add a heavy load of 500g lightly to the initial load, and after balancing for 45 seconds, measure the length Lb, accurate to 1mm. Remove the heavy load, hang the filaments on a rack, and place the rack in an oven at 121°C to dry for 30 minutes. The filaments were taken out from the oven and cooled to room temperature, and then placed in a constant temperature and humidity environment (temperature 21° C., humidity 65%) for 2 hours. Then measure its length Ca, accurate to 1mm. Then lightly add the heavy load, measure the length La after balancing for 45 seconds, accurate to 1mm. Remove the heavy load, measure the length Cc after balancing for 10 minutes, accurate to 1mm.

Bring the above measured values into the following formula to calculate shrinkage % CS, crimp rate %CCb before heating, and crimp rate %CCa after heating. Shrinkage % CS=(Lb-La)/La * 100%; Curl % includes CCb=(Lb-Cb)/Lb * 100 % (before heating) and CCa=(La-Ca)/La * 100% ( after heating). Characterization of anti-pilling properties

Unless otherwise indicated, the method of GB/T 4802.3 ICI 7200/14400 was used to evaluate the anti-pilling properties of the samples and reference products in the examples. Characterization of dyeing properties

Color depth ("Color Shade") is evaluated by human eye observation.

The evaluation of color fastness ("Color fastness") adopts the AATCC 8/ ATTCC 61 method to measure color change, staining degree, dry rubbing fastness and wet rubbing fastness respectively.

The % dyeing strength ("Dyeing Str") of the samples and comparison photos in the examples was measured using a spectrophotometer. According to the Kubelka-Munk equation (Kubelka-Munk equation), K/S = (1− R𝜆 ) ² /2R𝜆, where K is the constant of light absorbed by dyed fabric; S is the constant of light scattered by dyed fabric; R is the reflectance of the dyed fabric, expressed in relative proportions. The larger the K/S value, the darker the color; the smaller the K/S value, the lighter the color.

The L, a, and b values of the stained samples were measured using an instrument LabScan XE Spectrophotometer.

The examples given below are for the purpose of illustrating the application only and are not intended to limit it. Although suitable methods and materials are described herein, methods and materials similar or equivalent to those described herein can be used in the practice or testing of the present application. All parts, percentages, etc. are by weight unless otherwise indicated. Embodiment: Example 1 : Preparation and physical property test of PBT/PTT mixed polyester chemical fiber 1.1 Preparation and performance characterization of the single-component filament of uniform component

Polytrimethylene terephthalate (commercially available under the trade name SORONA ^® , with an intrinsic viscosity of 1.02) and polybutylene terephthalate (with an intrinsic viscosity of 1.10) were physically mixed in different proportions, and the mixed poly The ester chips are fed into the extruder from the feed port. The extruder is a single-screw extruder, which is divided into three temperature zones. The mixed polyester raw materials are heated and sheared in the extruder, and after melting, they pass through the spinning element and are extruded from the spinneret. The first stretching roll and the second stretching roll are stretched, and finally wound into a fully extended filament yarn (FDY) sample.

Separately adopt poly(trimethylene terephthalate) chip as raw material to put into extruder, as contrasting poly(trimethylene terephthalate) fully extended filament yarn. Separately adopt polybutylene terephthalate chip as raw material to put into extruder, as the polybutylene terephthalate fully extended filament yarn of contrast. The specifications of the fully extended silk yarns are all 75D/72f (the thickness of the yarn is 75 deniers, and the number of spinneret holes is 72 holes). The process parameters of samples and reference substances are shown in Table 1. Table 1 contains the single-component filament samples and reference substance process parameters of different PBT/PTT ratios Process parameters Sample name PBT/PTT mixing ratio Extruder three temperature zone temperature (℃) The speed of the first stretching roller The temperature of the first stretching roll Second stretching roller speed Second stretching roll temperature (°C) Winder speed Experimental sample 1-1-1 (B90) 90/10 250/255/260 2300 50 3020 120 2860 Experimental sample 1-1-2 (B80) 80/20 250/255/260 2300 50 3020 120 2860 Experimental sample 1-1-3 (B60) 60/40 250/255/260 2300 50 3020 120 2910 Experimental sample 1-1-4 (B40) 40/60 250/255/260 2200 50 2945 124 2940 Experimental sample 1-1-5 (B20) 20/80 250/255/260 2250 50 2990 126 3000 Control 1-1-6 (PBT) 100/0 250/255/260 2300 50 3060 116 2860 Control 1-1-7 (PTT) 0/100 250/255/258 2350 55 3020 120 2950

It was observed that fully drawn yarn (FDY) samples with evenness and uniformity could be obtained.

Further, the performance of the above-mentioned fully extended silk yarn was analyzed, and the obtained results are shown in Table 2. Table 2 contains the performance of the single-component filament sample and reference substance of different PBT/PTT ratios Parameter Sample name Breaking strength (CN/dtex) Elongation at break (%) Young's modulus (cN) Fiber shrinkage % Experimental sample 1-1-1 (B90) 3.04 56.88 28.22 7.24 Experimental sample 1-1-2 (B80) 2.93 56.19 29.58 7.95 Experimental sample 1-1-3 (B60) 3.07 52.01 29.40 12.38 Experimental sample 1-1-4 (B40) 2.98 55.79 27.94 11.26 Experimental sample 1-1-5 (B20) 2.56 60.60 25.16 7.85 Control 1-1-6 (PBT) 3.10 54.83 24.51 6.24 Control 1-1-7 (PTT) 2.85 56.75 22.62 7.24

The partial fully extended silk yarn (FDY) samples obtained above and the reference product were further knitted into socks, and the socks tubes were dyed. The dyeing adopts the condition of 100°C for 45min. The specific heating, cooling and post-treatment procedures go through the following steps: at room temperature, at a rate of 1°C/min, the temperature is raised to 40°C and maintained for 10 minutes, and then continue at a rate of 1°C/min. Raise the temperature to 70°C and keep it for 10 minutes, and finally raise the temperature to 100°C at a rate of 1°C/min and keep it for 45 minutes, then cool it down to 80°C at 2-3°C/min, and treat it with 1g/L soda ash for 10 minutes at 80°C. Then treated with 1g/L neutral washing solution for 10 minutes, and finally washed with water at room temperature for 5 minutes to complete the dyeing. The dye is Disperse Brilliant Blue E-4R from Zhejiang Deou Chemical Manufacturing Co., Ltd., with a concentration of 1.2%. After the same dyeing process, the color depth of some experimental samples and control samples was measured. The results are shown in Table 3. Table 3 contains the dyeing properties of single-component filament samples and reference substances of different PBT/PTT ratios sample name Experimental sample 1-1-1 (B90) Experimental sample 1-1-2 (B80) Experimental sample 1-1-3 (B60) Experimental sample 1-1-4 (B40) Control 1-1-6 (PBT) Control 1-1-7 (PTT) color depth 4.0 4.0 4.5 4.5 3.5 2.5

The above color depth results show that the mixed polyester chemical fiber material has a better dyeing effect, and the color depth value is higher, and when different polyesters are mixed in a larger proportion, that is, when the mixing ratio is close to 50/50, the dyeing deepening effect is more obvious , the dyeing effect at this time is better than that when different polyesters are mixed in a smaller proportion, that is, the dyeing effect when the mixing ratio is far from 50/50. 1.2 Preparation and performance characterization of bicomponent composite filament

Similar to the preparation method described in part 1.1 of Example 1, polytrimethylene terephthalate (commercially available under the trade name SORONA ^® , intrinsic viscosity is 1.02) chips and polybutylene terephthalate chips (intrinsic viscosity is 1.10), physically mixed in different proportions, and put the mixed polyester chips into the extruder from the feed port. The extruder is a single-screw extruder, which is divided into three temperature zones. The mixed polyester raw materials are heated, sheared and melted in the extruder.

The difference is that the resulting mixed polyester melt is co-extruded with PET melt that has been heated, sheared and melted in another extruder, and then passed through the spinning assembly and extruded from the spinneret. According to this method, the mixed polyester and PET are made into a two-component composite filament at a ratio of 50/50. The bicomponent composite filaments were fully drawn yarn (FDY) samples.

Polytrimethylene terephthalate slices were used alone as raw materials and fed into the extruder, and a fully extended yarn sample of PTT and PET bicomponent composite filaments with a ratio of 50/50 was prepared as a control according to the above method. Polybutylene terephthalate chips were used alone as raw materials and fed into the extruder, and a fully extended yarn sample of PBT and PET bicomponent composite filaments with a ratio of 50/50 was made according to the above method as a control. The bicomponent composite filament is a fully extended filament yarn (FDY) reference product.

The parameters shown in Table 4 were used for the full-stretch yarn samples and reference products of the above-mentioned bicomponent composite filaments, and the specifications were both 75D/36f. Table 4 The process parameters of the two-component composite filament sample and reference substance Parameter Sample name The actual proportion of PBT/PTT in the mixed polyester in the sample Sample polyester composition PET/(PBT/PTT) The speed of the first stretching roller The temperature of the first stretching roll Second stretching roller speed Second stretching roll temperature Winder speed Experimental sample 1-2-1 (bico B70) 72.1/27.9 50/(36/14) 1600 78 4120 170 4055 Experimental sample 1-2-2 (bico B50) 50.8/49.2 50/(25/25) 1500 78 4380 175 4295 Experimental sample 1-2-3 (bico B40) 38/62 50/(19/31) 1450 78 4340 175 4295 Experimental sample 1-2-4 (bico B30) 27.6/72.4 50/(14/36) 1350 78 4340 175 4295 Control 1-2-5 (bico PBT) 100/0 50/(50/0) 2000 78 4050 168 4000 Control 1-2-6 (bico PTT) 0/100 50/(0/50) 1300 78 4150 170 4055

Further, the properties of the above two-component composite filament samples were analyzed, and the results are shown in Table 5. The performance of table 5 two-component composite filament sample and reference substance Parameter Sample name Breaking strength (CN/dtex) Elongation at break (%) Young's modulus (cN) Cca @ 90C / % CS @ 90C / % Cca @ 120C / % CS @ 120C / % CCb / % Experimental sample 1-2-1 (bico B70) 3.47 27.28 51 38.0 6.4 26.05 11.5 7.5 Experimental sample 1-2-2 (bico B50) 3.60 23.66 53 38.0 7.0 26.8 12.3 5.7 Experimental sample 1-2-3 (bico B40) 3.37 26.87 52 31.0 4.7 24.5 10.7 3.7 Experimental sample 1-2-4 (bico B30) 3.22 22.69 52 35.2 5.2 26.2 10.5 11.5 Control 1-2-5 (bico PBT) 3.38 (3.2-3.5) 20.38 (18-25) 50 38.9 4.1 25.6 8.6 twenty four Control 1-2-6 (bico PTT) 3.34 (3.2-3.5) 28.7 (25-30) 45 57.1 7.7 38.4 13.8 22.7 1.3 Preparation and performance characterization of woven fabrics

The two-component composite filament obtained above (experimental sample 1-2-1, experimental sample 1-2-2, experimental sample 1-2-3 and experimental sample 1-2-4) and PET yarn are braided together into fabric.

The weaving method of the weaving fabric: the warp direction adopts the stretched PET yarn with the specification of 75D/72f, and the weft direction adopts the above-mentioned bicomponent composite filament with the specification of 75D/36f and the PET stretched yarn with the specification of 150D/288f Textured yarn, the ratio of the two is 3:1.

As a control, polytrimethylene terephthalate slices were used as raw materials and put into the extruder, and PTT and PET bicomponent composite filaments were made according to the above method, wherein the ratio of PET to PTT was 60/40. Using the same fabric weaving method as above, the fully extended silk yarns of the obtained bicomponent composite filaments were mixed and woven to make a woven fabric as a contrast woven fabric.

The physical properties of the resulting fabric were analyzed, and the results are shown in Table 6. Table 6 two-component composite filament sample and the physical properties of the fabric made from the photo weaving name Experimental sample 1-3-1 Experimental sample 1-3-2 Experimental sample 1-3-3 Experimental sample 1-3-4 Control 1-3-5 Two-component composite filament composition (PET/PBT-PTT) 50/(36/14) 50/(25/25) 50/(19/31) 50/(14/36) 60/(0/40) Mixed polyester chemical fiber Experimental sample 1-2-1 (bico B70) Experimental sample 1-2-2 (bico B50) Experimental sample 1-2-3 (bico B40) Experimental sample 1-2-4 (bico B30) PTT alone Width shrinkage after 135℃/40min treatment, % 28.9 30.6 30.7 26.9 28.3 Elongation under force, % 13.2 12.8 13.2 10.8 13.2 1.4 Dyeing elasticity of bicomponent composite filament yarn fabric

Using the above obtained part of the 75D two-component composite filament sample (experimental sample 1-2-2 and experimental sample 1-2-4) and reference substance (control sample 1-2-5 and control sample 1-2-6) as weft yarns. Another specification is 150D PET stretch-textured yarn as the warp yarn, and the above-mentioned warp and weft yarns are woven with different weaving densities respectively to obtain fabric samples with different tightness, and the sample specifications are 3/2 RH Twill.

The obtained fabric samples were dyed, and their elasticity after dyeing was measured, as shown in Table 7 below. Table 7 Elasticity after dyeing Weaving tightness fabric density weaving name Experimental sample 1-4-1 Experimental sample 1-4-2 Control 1-4-3 Control 1-4-4 Two-component composite filament sample Experimental sample 1-2-2 Experimental sample 1-2-4 Control 1-2-5 Control 1-2-6 Mixed polyester chemical fiber composition (PBT-PTT) 50.8/49.2 27.6/72.4 100/0 0/100 Two-component composite filament composition (PET/PBT-PTT) 50/(25/25) 50/(14/36) 50/(50/0) 50/(0/50) loose 126×115 Elasticity% after dyeing 41.6 39.2 37.6 45.6 medium 135×115 Elasticity% after dyeing 31.2 29.6 34.8 35.2 tighter 150×115 Elasticity% after dyeing twenty four 22.4 26.0 26.8 extremely tight 165×115 Elasticity% after dyeing 17.6 16.8 19.6 19.2

Based on the above experimental results, it can be found that although the mixed polyester chemical fiber material of the present application is fed by physically mixing different kinds of polyesters, a uniform material can be obtained and even fibers with evenness can be obtained. The process parameters such as the weaving speed are acceptable in the industry, and are equivalent to the parameters of the existing common textile materials. The mixed polyester chemical fiber material of the present application can achieve good dyeing effect, and its physical properties such as strength, elasticity and shrinkage characteristics are also acceptable. Embodiment 2 : PTT mixes the sample and performance of different polyesters

Referring to the method in Example 1, PTT/PBT mixed polyester chemical fiber and PTT/PET mixed polyester chemical fiber were prepared. The chemical fiber using PTT alone was used as a control. The same processing technology is used to prepare the yarns of the above three chemical fiber materials, and further make them into fabrics. The fabric specifications are all 40s (40 counts).

The obtained fabric was dyed, and the dyeing was all carried out at a temperature of 90° C., and the temperature rising, cooling and post-treatment procedures were referred to the steps in Example 1. The dye is 3% dark blue (Navy Blue). Finishing after dyeing to obtain a dyed fabric. The dyeing effect is shown in Figure 1.

For above-mentioned PTT/PBT mixed polyester chemical fiber, PTT/PBT mixed polyester chemical fiber and the contrast that uses PTT alone to carry out the measurement of breaking strength, elongation at break, boiling width shrinkage, pilling rating, dyeing strength, the results are shown in the table 8. Table 8 Characteristics of different polyester blend samples sample Experimental sample 2-1 Experimental sample 2-2 Control sample 2-3 fiber composition PTT/PBT ratio 50/50 PTT/PET ratio 50/50 PTT alone Breaking strength (cN/Tex) 13.3 21.6 16 Elongation at break% 33 28.7 49.2 Fiber shrinkage % 11.7 15.1 8.7 Pilling Rating 2 3 2-3 Staining strength% 100% 70% 18%

In summary, it can be seen that adding a certain proportion of other polyesters to pure PTT by physical mixing can significantly improve the dyeing strength. At the same time, other physical properties, such as strength, shrinkage, and pilling resistance, have also achieved good results Excellent performance, industrially acceptable, and extremely high feasibility.

In particular, the incorporation of PBT in PTT achieved relatively better depth of staining compared to incorporation of PET in PTT. Embodiment 3 : the dyeing performance of mixed polyester chemical fiber 3.1 the dyeing color and luster of this application mixed polyester chemical fiber material

With reference to the process preparation in Example 1, the PBT/PTT mixing ratio is a mixed polyester chemical fiber material of 40/60, and the gained mixed polyester chemical fiber material is made into a single-component yarn through spinning, and then hosiery and socks are knitted Cylinder dyeing to obtain dyed samples of mixed polyester chemical fiber materials.

Socks are dyed at 95°C for 45 minutes. Heating, cooling and post-processing procedures refer to the steps in Example 1. The dye concentration is 2%.

Using the same process, but not using PBT/PTT mixed polyester, but using PBT and PTT alone as a control. Through the same spinning, hosiery and sock tube dyeing process, the pure PBT dyeing reference substance and the pure PTT dyeing reference substance were obtained.

For the dyed sample and reference substance, L, a and b values were measured, and the results are shown in Table 9. Table 9 Dyeing color dye used Dyeing sample of mixed polyester chemical fiber material Pure PBT staining control substance Pure PTT staining control Fiber composition: PBT/PTT (ratio 40/60) Fiber Composition: PBT alone Fiber composition: PTT alone L* a* b* L* a* b* L* a* b* Anoky (brand Pink PUD) 57.74 57.4 18.44 64.6 40.53 5.85 58.48 52.84 18.38 Anoky (Brill Red PUD) 40.77 61.58 34.93 41.06 58.07 30.12 49.89 56.84 25.75 Anoky (brand Navy PUD-SD) 15.28 2.32 -9.87 18.66 2.21 -12.9 29.41 -4.41 -7.72 Anoky (brand Orange PUD-SD) 42.45 44.54 43.03 42 40.73 42.8 50.07 29.38 35.49 Anoky (brand T/Q Blue) 46.81 -14.17 -36.72 53.39 -17.2 -32.15 62.23 -15.63 -26.11 Anoky (brand Blue) 21.41 8.2 -34.07 24.23 8.4 -36.74 27.15 1.8 -32.33 Anoky (brand Dark black) 13.78 0.42 -1.46 16.08 -0.74 -1.85 20.33 -3.19 -1.47 Anoky (brand Deep Red) 37 47.07 6.86 45.42 45.06 4.54 42.58 37.25 -0.31 Anoky (brand Rose PUD) 21.5 36.86 -2.56 26.97 40.11 -3.58 51.12 36.95 1.79

In summary, it can be found that compared with the pure PBT reference substance and the pure PTT reference substance, the dyed sample of the mixed polyester chemical fiber has achieved better dyeing color. In any of the above colors, mixed polyester dyed samples have lower L values; in some colors, mixed polyester dyed samples have higher a values, and in some colors, mixed polyester dyed samples have higher b value. 3.2 The dyeing results of the mixed polyester chemical fiber materials in this application under different dyeing processes

With reference to the method in Example 1, prepare the woven fabrics of Experimental Sample 1-3-1, Experimental Sample 1-3-2, Experimental Sample 1-3-3 and Experimental Sample 1-3-4; carry out high-pressure dyeing to obtain High pressure dyed sample 3-2-1, high pressure dyed sample 3-2-2, high pressure dyed sample 3-2-3 and high pressure dyed sample 3-2-4.

High-pressure dyeing adopts the following method: the dye is added at 60°C, then the temperature is raised to 98°C at a rate of 1.5°C/min, and kept for 15 minutes, and then the temperature is further raised to 135°C at a rate of 0.7°C/min and kept for 45 minutes, and finally Cool at a rate of 2°C/min to 80°C to complete dyeing.

Use the control sample 1-2-5 two-component composite filament and the control sample 1-2-6 two-component composite filament to make woven fabrics in the same way, and use the same conditions for high-pressure dyeing to obtain PBT respectively. High pressure staining control substance and PTT high pressure staining control substance.

The resulting high-pressure dyed samples of the mixed polyester chemical fibers, the PBT high-pressure dyed reference substance and the PTT high-pressure dyed reference substance, the color depth results are shown in Table 10. The dyeing effect is shown in Figure 2. Table 10 Color depth of high pressure dyeing sample name High pressure dyeing sample 3-2-1 High pressure dyeing sample 3-2-2 High pressure dyeing sample 3-2-3 High Pressure Dyeing Sample 3-2-4 PBT high pressure staining control substance PBT high pressure staining control substance Mixed polyester chemical fiber composition (PBT-PTT) 70/30 50/50 40/60 30/70 100/0 0/100 bicomponent composite filament Experimental sample 1-2-1 Experimental sample 1-2-2 Experimental sample 1-2-3 Experimental sample 1-2-4 Control 1-2-5 Control 1-2-6 Two-component composite filament composition (PET/PBT-PTT) 50/(36/14) 50/(25/25) 50/(19/31) 50/(14/36) 50/(50/0) 50/(0/50) color depth 3.5 4.5 4.0 3.5 3.0 3.0

Referring to the method in Example 1, the blended polyester chemical fiber materials with PBT and PTT ratios of 80/20 and 60/40 were prepared respectively. The obtained mixed polyester chemical fiber material is spun together with PET yarn at a ratio of 50/50 to form a bicomponent composite filament.

PBT and PTT were used alone, and PET was spun into bicomponent composite filaments at a ratio of 50/50 as a control.

The above-mentioned two-component composite filament yarn sample and reference product were knitted into hosiery, and then dyed through the sock tube, and the obtained sample and reference product were dyed under normal pressure. The dyeing method is the same as the sock tube dyeing method in Example 1. The obtained results are shown in Figure 3, and the color depth is shown in Table 11. Table 11 Color depth of normal pressure dyeing Mixed polyester chemical fiber composition (PBT-PTT) 0/100 60/40 80/20 100/0 Two-component composite filament composition (PET/PBT-PTT) 50(0/50) 50/(30/20) 50/(40/10) 50/5(0/0) color depth 2.5 4.5 4.0 3.5

In summary, under normal pressure (100°C), good dyeing can be obtained by mixing polyester chemical fiber materials, without dyeing under high pressure (135°C); while the control product cannot obtain good dyeing under normal temperature and pressure.

In addition, the above results show that whether dyed under normal pressure or high pressure, the mixed polyester chemical fiber material shows better dyeing effect and higher color depth. At the same time, when the two are mixed in a large proportion close to the average, the dyeing effect is enhanced better than when the two are mixed in a small uneven proportion. For example, the mixing effect of 50/50 is significantly better than 40/60; the effect of 40/60 is significantly better than 30/70 or 70/30.

It is believed that the physical mixing of PTT and PBT can affect the crystallization of the entire melt system. When the degree of stable crystallization is reduced, it is easier to dye. Under relatively mild conditions, such as normal pressure or lower temperature, that is Can form a good dyeing effect. When the two are mixed in a large proportion, the stable crystallization will be reduced to a greater extent than when the two are mixed in a small proportion. Therefore, when the two are mixed in a large proportion, the dyeing effect is better.

In the field of textile dyeing, when using disperse dyes for dyeing, the dyeing temperature is lower than 100 ℃, and no pressure is needed. And if the chemical fiber material requires a higher dyeing temperature, pressurized equipment is required. High temperature and high pressure not only increase the complexity of the process, but also increase the cost, and also have a negative impact on the performance of the fiber. Therefore, the dyeing effect of the mixed polyester chemical fiber at lower temperature and normal pressure is significantly better than that of the control group, which can solve the dyeing difficulties of textile materials. At the same time, due to the good dyeing effect, it is not necessary to experience high temperature and high pressure dyeing conditions, so that other properties of the textile material can also be avoided from being damaged due to high temperature and high pressure. 3.3 Dyeing color fastness of mixed polyester chemical fiber materials in this application

A mixed polyester chemical fiber material with a PBT/PTT ratio of 50/50 as prepared by the method in Example 1 was adopted. The melt of mixed polyester chemical fiber material is made into staple fiber. In the ratio of 70/30, bamboo fiber short fibers were blended with the above-mentioned PBT/PTT mixed polyester short fibers to make a blended yarn sample (hereinafter referred to as "70/30 bamboo fiber/blended polyester blended yarn").

Using pure PTT yarn as a control, the same bamboo fiber staple fiber was blended with pure PTT yarn at a ratio of 70/30 to make a blended yarn sample (hereinafter referred to as "70/30 bamboo fiber/PTT yarn blended yarn") .

The above-mentioned 70/30 bamboo fiber/polyester blended yarn and 70/30 bamboo fiber/PTT yarn blended yarn are woven into knitted fabrics in the same way (hereinafter referred to as "70/30 bamboo fiber/polyester blended yarn respectively") Blended yarn knitted fabric" and "70/30 bamboo fiber/PTT blended yarn knitted fabric"), the specifications are both 30s (30 counts).

The obtained knitted fabric was dyed at 110° C. and 100° C. respectively, and the heating, cooling and post-treatment routines refer to the steps in Example 1. The color fastness of the dyed knitted fabric was evaluated by AATCC 8/ATTCC 61 method, and the results are shown in Table 12 below. Table 12 Color Fastness sample Composition of polyester fibers dyeing temperature Discoloration (washing) Staining degree (wash) Color fastness to dry rubbing Color fastness to wet rubbing 70/30 bamboo/polyester blended yarn knitted fabric PBT/PTT ratio is 50/50 100°C 4-5 3-4 3-4 3 110°C 4-5 3-4 4 3 70/30 bamboo fiber/PTT blended yarn knitted fabric Pure PTT 100°C 4-5 3-4 3-4 3 110°C 4-5 3-4 3-4 3

The above results show that the textile material made of the mixed polyester chemical fiber material of the present application has good color fastness, which is basically equivalent to the color fastness of the existing PTT textile material.

The field usually requires that the color change of textile materials>=4, and the degree of staining>=3, so it can be seen that the color fastness of the textile materials of the present application can meet the requirements. Embodiment 4: the performance of mixed polyester chemical fiber blended fabric

Blended fabric materials are commonly used in this field, and different textile materials have different handles. Different textile materials, such as wool with excellent hand feeling, acrylic fiber with fluffy but rough hand feeling, nylon with waxy feel and the mixed polyester chemical fiber material of this application are used to make blended yarns, and their properties are evaluated. Compared with the aforementioned existing fabric materials, such as wool, acrylic fiber and nylon, etc., the mixed polyester chemical fiber material has a moderate feel. 4.1 Preparation of blended fabrics

A mixed polyester chemical fiber material with a PBT/PTT ratio of 50/50 as prepared by the method in Example 1 was adopted. The melt of the mixed polyester chemical fiber material is made into short fibers (hereinafter referred to as "mixed polyester fiber").

Blended yarns were prepared according to the yarn composition in Table 13, and the blended yarns were further made into blended fabrics, all of which had a common count of 42 Nm. Yarn composition of table 13 blended fabric blended fabric Composition of blended yarn Sample 4-1-1 50% wool, 50% PBT/PTT blended polyester fiber (the blending ratio of PBT and PTT is 50/50) Reference substance 4-1-2 50% wool, 25% acrylic, 25% nylon Reference substance 4-1-3 50% wool, 50% PET 4.2 Hand feeling of blended fabrics

The handle of the above blended fabrics was analyzed. AATCC 202 standard test method was used to analyze the toughness, smoothness and softness of the blended fabric samples and reference products, and the results are shown in Table 14 to Table 16 below. Table 14 Tenacity of blended fabrics grade blended fabric toughness value standard deviation in the range of 0-100% 1 Sample 4-1-1 19.09 0.582 19.09% 2 Reference substance 4-1-2 16.93 0.582 16.93% 3 Reference substance 4-1-3 16.74 0.726 16.74%

The above toughness results show that the blended fabric sample 4-1-1 is more tough. The blended polyester chemical fiber material of the present application can bring better toughness value to the blended fabric.

According to the ASTM minimum requirements, using 5 samples, based on the DF value and the 0.050 significance level, the key value Tc=2.306, it is considered that: the blended fabric sample 4-1-1 and the blended fabric reference product 4-1-2 have statistically significant toughness There is a significant difference in science because T=5.886>Tc. The blended fabric sample 4-1-1 and the blended fabric control 4-1-3 have a statistically significant difference in tenacity because T=5.652>Tc. There is no statistically significant difference in tenacity between the blended fabric control product 4-1-2 and the blended fabric control product 4-1-3, because T=0.445<Tc. Table 15 Softness of blended fabrics grade blended fabric softness value standard deviation in the range of 0-100% 1 Sample 4-1-1 76.66 0.187 76.66% 2 Reference substance 4-1-2 75.93 0.281 75.93% 3 Reference substance 4-1-3 75.90 0.303 75.90%

The above softness results show that the blended fabric sample 4-1-1 has higher softness and is softer. The blended polyester chemical fiber material of the present application can bring better softness to blended fabrics.

According to the ASTM minimum requirements, using 5 samples, based on the DF value and the 0.050 significance level, the key value Tc=2.306, it is considered that: the blended fabric sample 4-1-1 and the blended fabric reference product 4-1-2 have the same softness Statistically significant difference because T=4.887>Tc. The blended fabric control 4-1-3 of the blended fabric sample 4-1-1 has a statistically significant difference in softness because T=4.788>Tc. There is no statistically significant difference in softness between the blended fabric control product 4-1-2 and the blended fabric control product 4-1-3, because T=0.138<Tc. Table 16 Smoothness of blended fabrics grade blended fabric smoothness value standard deviation in the range of 0-100% 1 Sample 4-1-1 68.66 0.077 68.66% 2 Reference substance 4-1-2 68.31 0.174 68.31% 3 Reference substance 4-1-3 68.29 0.215 68.29%

The above softness results show that the blended fabric sample 4-1-1 has higher smoothness and is smoother. The applied blended polyester chemical fiber material can bring better smoothness to blended fabrics.

According to the minimum requirements of ASTM, using 5 samples, based on D.F value and 0.050 significance level, the key value Tc=2.306, it is considered that: The smoothness of the blended fabric sample 4-1-1 and the blended fabric reference product 4-1-2 has a statistically significant difference because T=4.086>Tc. The blended fabric control 4-1-3 of the blended fabric sample 4-1-1 has a statistically significant difference in smoothness because T=3.604>Tc. There is no statistically significant difference in smoothness between the blended fabric control product 4-1-2 and the blended fabric control product 4-1-3, because T=0.160<Tc.

Based on the above results, it can be found that compared with the existing textile materials, the mixed polyester chemical fiber material of the present application has achieved better toughness, smoothness, softness and better hand feeling. 4.3 Anti-pilling properties of blended fabrics

The anti- pilling properties of blended fabric sample 4-1-1, blended fabric reference product 4-1-2 and blended fabric reference product 4-1-3 in this embodiment are evaluated. Using the same conditions, the blended fabric sample 4-1-1, the blended fabric reference sample 4-1-2 and the blended fabric reference sample 4-1-3 were made into fabric sheets and garment fabrics, and the obtained fabric sheets and garment The anti-pilling and anti-pilling properties of the anti-pilling and anti-fluffing properties were evaluated, and the pilling and fluffing rating values were measured under different turning numbers. The results are shown in Table 17. Table 17 Pilling and fluff rating of blended fabrics fabric piece Clothing fabric blended fabric Turn 7200 rpm Turn 14400 rpm Turn 7200 rpm Turn 14400 rpm Sample 4-1-1 3 2 3.5 2.5 Reference substance 4-1-2 3 2 3.5 2.5 Reference substance 4-1-3 3 2.5 3.0 2.5

The pilling and fuzzing properties of the blended fabric sample 4-1-1 were comparable to those of the two controls. In summary, the blended polyester chemical fiber material of the present application has good anti-pilling and fuzzing properties, which are comparable to those of existing common textile materials and are acceptable. 4.4 Dimensional stability of blended fabrics

Adopt the method of AATCC 135 to evaluate the dimensional stability of the fabric sheet of blended fabric sample 4-1-1, blended fabric reference product 4-1-2 and blended fabric reference product 4-1-3 in the present embodiment, under the following conditions The shrinkage was measured, and the results are shown in Table 18. Table 18 Dimensional Stability blended fabric Hand wash/Flat dry Machine wash/Tumble dry portrait horizontal portrait horizontal Sample 4-1-1 -1.3% -1.1% -3.2% -2.4% Reference substance 4-1-2 -1.7% -1.7% -4.8% -2.3% Reference substance 4-1-3 -1.6% -1.7% -4.7% -1.2%

The method in Example 3 was used to prepare 70/30 bamboo fiber/mixed polyester blended yarn knitted fabric, and its dimensional stability was evaluated. Using the method of AATCC 135 to measure the shrinkage rate (fabric shrinkage%) of 70/30 bamboo fiber/blended polyester blended yarn knitted fabric, using ISO 3005:1978 to evaluate the air warp of 70/30 bamboo fiber/blended polyester blended yarn knitted fabric The size shrinkage (fabric shrinkage%) after steaming (free-steaming), the results are shown in Table 19. Table 19 Dimensional Stability Wash (lay flat to dry) Steam vertical Latitude vertical Latitude Shrinkage % -3.7% -3.9% -0.2% -0.8%

The method in Example 3 was used to prepare 70/30 bamboo fiber/mixed polyester blended yarn and 70/30 bamboo fiber/PTT yarn blended yarn, and evaluate its shrinkage performance. The 70/30 bamboo fiber/polyester blended yarn and the 70/30 bamboo fiber/PTT yarn blended yarn are made into woven pieces, and the specification of the woven piece is 44s/2 (44 counts/2 strands). Keep for 30min and 100°C for 45min under the two dyeing conditions, and then measure the shrinkage after washing (laying and drying). Table 20 Shrinkage properties Sample Yarn Composition Dyeing Conditions Shrinkage performance of washing tiles and drying in the sun% 70/30 bamboo/polyester blended yarn 100℃, 30min 93% 100℃, 45min 93.50% 70/30 bamboo fiber/PTT yarn blended yarn 100℃, 30min 97% 100℃, 45min 97.30%

The above shrinkage results can all meet industrial requirements, and compared with existing textile materials, the mixed polyester chemical fiber material of the present application can achieve less shrinkage. Therefore, the mixed polyester chemical fiber of the present application has good dimensional stability and high industrial feasibility. Embodiment 5 : the oligomer content of mixed polyester chemical fiber material

With reference to the method in Example 1, PTT and PBT are mixed with polyester chemical fiber material in a ratio of 60/40, and the method of NMR nuclear magnetic resonance is used to measure the oligomer content in the mixed polyester chemical fiber, and the contrast of using PTT resin alone The oligomer content contained in the product and the control product using PBT resin alone is compared, and the results are shown in Table 21. Table 21 oligomer content fiber material Oligomer content (wt%) 100% PTT resin reference substance 2.5 100% PBT resin reference substance 0.7 Blended polyester sample with a PTT/PBT ratio of 60/40 1.8

From the results in Table 21, it can be seen that the mixed polyester chemical fiber material of the present application has a relatively low oligomer content. Oligomers tend to migrate to surfaces during processing, which can potentially contaminate equipment. Therefore, the lower oligomer content of the mixed polyester chemical fiber of the present application will help to improve the equipment pollution problem in the processing process and improve the processing feasibility.

Based on the above results, it can be seen that the mixed polyester chemical fiber material of the present application has better coloring performance, and it can be dyed at a lower temperature and normal pressure, and the obtained color is excellent, and the color fastness is better. Meanwhile, other characteristic indexes are also acceptable in the industry.

The mixed polyester chemical fiber material of the present application has better process performance, good industrial feasibility, and can save material cost. It can be directly used in the processing technology of existing textile materials, can be compatible with existing processing equipment of other textile materials, and can save processing costs. The blended polyester chemical fiber material of the present application has also achieved good technical effects in terms of body, feel, softness, smoothness, dimensional stability and the like.

The mixed polyester chemical fiber material of this application can achieve good dyeing effect without high temperature and high pressure conditions, so when it is blended with other textile materials, especially when blended with other textile materials with mild dyeing conditions, high temperature and high pressure dyeing can be avoided The process damages the textile fibers, which is beneficial to the blended materials to obtain good physical properties.

The mixed chemical fiber material of the present application has a good application prospect, and it has good compatibility with other existing types of textile materials, such as wool, and can be processed into fabrics together with other existing types of textile materials to obtain good composite performance.

The above-described embodiments of the present application are presented by way of illustration. It is not intended to be exhaustive, nor is it intended to limit the application to the exact forms disclosed. Many variations and modifications to the described embodiments will be apparent to those skilled in the art in view of the disclosure herein.

Fig. 1 is the fabric dyeing result of the mixed polyester chemical fiber material of the present application in Example 2. Fig. 2 is the fabric dyeing result of the PBT/PTT mixed polyester chemical fiber material in embodiment 3. Fig. 3 is the yarn sock tube dyeing result of the PBT/PTT mixed polyester chemical fiber material in embodiment 3.

Claims (23)

A chemical fiber material, which uses at least one polyester and at least another polyester as raw materials, and physically mixes the at least one polyester and the at least another polyester before spinning. For the chemical fiber material of claim 1, the polyester is physically mixed with the other polyester at a ratio of 1/99 to 99/1. As the chemical fiber material of claim 2, the at least one polyester is an aromatic polyester. As in the chemical fiber material of claim 3, the at least one other polyester is an aromatic polyester. As the chemical fiber material of claim 4, the aromatic polyester is polyalkylene terephthalate. Such as the chemical fiber material of claim 5, the polyalkylene terephthalate is polyethylene terephthalate, polytrimethylene terephthalate, polybutylene terephthalate and/or Polyethylene terephthalate. Such as the chemical fiber material of claim 2, the at least one polyester is polytrimethylene terephthalate, the at least another polyester is polybutylene terephthalate, and the polytrimethylene terephthalate and the polytrimethylene terephthalate Polybutylene terephthalate is physically mixed in a ratio of 40/60~60/40. A yarn comprising the chemical fiber material as claimed in claim 1. As the yarn of claim 8, the yarn is a monocomponent filament with uniform composition. As the yarn of claim 8, the yarn is a bicomponent composite filament. As the yarn of claim 8, the chemical fiber material is short fiber. As the yarn of claim 11, the yarn is a blended yarn, which also includes other fiber materials. As in the yarn of claim 12, the other fiber materials are wool fibers, nylon fibers, cotton fibers, acrylic fibers and/or viscose fibers. A fabric and/or other products comprising the chemical fiber material according to claim 1. A method for preparing a textile material, which uses at least one polyester and at least another polyester as raw materials, physically mixes different polyesters, and prepares the resulting mixture into a textile material. The preparation method according to claim 15, further comprising heating and extruding the mixed material obtained by physical mixing to obtain a melt of the mixed material, and making the melt into the chemical fiber material. The preparation method according to claim 16, further comprising making the melt pass through a spinning assembly to produce the chemical fiber material. As in the preparation method of claim 17, the different polyesters are not subjected to additional melt blending before the melt passes through the spinning element. A textile material prepared by the method of claim 18. A fabric and/or other articles comprising the textile material of claim 19. A method for dyeing textile materials, the method comprising adding at least one polyester to at least one polyester through physical mixing as a raw material, the at least one polyester and the at least another polyester are physically mixed to obtain a mixed material, the The melt of the mixed material is made into a textile material, and then the textile material is dyed under normal pressure and/or at a temperature lower than 130°C. Such as the textile material dyeing method of claim 21, which is dyed at 100°C. Such as the textile material dyeing method of claim 22, which is dyed at 90°C.

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