Polyamide ester fiber with accurate dosage identification function and preparation method thereof

Abstract

The invention discloses a polyamide ester fiber with a function of accurately identifying dosage and a preparation method thereof. The fiber is prepared by blending polyamide ester polymer slices with modified polyamide ester masterbatch through a composite melt spinning process; the modified polyamide ester masterbatch is added in an amount of 1% to 5% of the weight of the polyamide ester polymer slices; the modified polyamide ester masterbatch is prepared by mixing a mixture of magnesium oxide and barium sulfate nanoparticles with polyamide ester polymer slices through a screw extruder; the mass fraction of the mixture of magnesium oxide and barium sulfate nanoparticles in the modified polyamide ester masterbatch is 2% to 10%, and the mass ratio of magnesium oxide to barium sulfate is 3:7 to 5:5. The invention tests the content of magnesium and barium elements by elemental analysis, thereby solving the problem that it is difficult to identify polyamide ester fibers and polyester fibers when the traditional method of detecting the proportion of filler dosage is used, especially the problem that the polyamide ester dosage detection result is inaccurate when the polyamide ester fiber and polyester fiber are mixed.

Description

Technical Field

[0001] The invention belongs to the technical field of functional composite fibers, and in particular relates to a polyamide ester fiber with a dosage accurate identification function and a preparation method thereof. Background Art

[0002] As a new type of environmentally friendly material, fiber flakes are increasingly widely used in various fields. Green environmental protection, high efficiency and energy saving, and strong functionality are the future development trends of fiber flakes. Fiber flakes are a soft, breathable, and highly absorbent fiber product made from fibers treated by rollers, water spraying, and steaming. Fiber flakes are made of a variety of materials and are widely used in construction, home furnishings, automobiles, chemical fibers, textiles, and other fields. With the continuous innovation of science and technology and the improvement of technology, the application fields of fiber flakes will continue to expand, and the development prospects are very broad.

[0003] At present, as a filling material for clothing and spring and summer quilts in the field of home textiles and clothing, fiber flakes of different materials have been widely used as filling materials for clothing and spring and summer quilts. Fiber flakes of different materials give different functions to products such as clothing and quilts. For example, the filling materials used for clothing include cotton, down, silk cotton, acrylic cotton, space cotton, etc. Cotton is a more commonly used thermal insulation material. Wearing clothes filled with cotton is comfortable and relatively cheap; down is generally processed from the short down of poultry, which is the main filling material for winter clothes. It is fluffy and thin, and duck down and goose down are more common; the flake material after silk finishing has excellent elasticity and warmth, but the price is high, and it is often used as filling for high-end cotton clothes; acrylic cotton is processed from acrylic fiber, which is both warm and not easy to deform, but has poor air permeability; space cotton, as a new material, is ultra-thin, ultra-light and cold-proof, simple to make and easy to care for, but has poor air permeability. The filling materials used for quilts include polyester fiber, silk, wool, down, etc. Polyester fiber has good elasticity and is easy to wash, but is relatively cheap; silk, as a protein fiber, is moisture-absorbent and breathable and contains amino acids that are beneficial to the human body, and has excellent thermal insulation properties; wool is naturally warm and moisture-absorbent and breathable, which helps reduce allergic reactions; down is soft and elastic, has excellent thermal insulation properties, but is not easy to clean and maintain.

[0004] Polyester fiber flakes are a kind of loose fiber made of polyester fiber. They have the characteristics of high strength, corrosion resistance, good fluffiness, and affordable price. They have become the mainstream filling material for home textile products such as clothing and quilts and are widely used. Although polyester fiber has many advantages, it also has some defects. As a filling material, it has a poor feel and poor hydrophilic moisture conduction performance, resulting in low air permeability and moisture permeability, thus affecting the wearing and use experience of clothing and quilts. In recent years, polyamide fiber has been widely used in the fields of clothing and decoration because of its soft feel and good simulation effect, excellent hydrophilic moisture conduction performance, and good air permeability and moisture permeability. Mixing polyester fiber and polyamide fiber as fiber flakes for filling materials for clothing and quilts has achieved the effect of complementary advantages, so it has become a popular filling material.

[0005] Polyamide fiber is a fiber made from the copolymerization of terephthalic acid, ethylene glycol and caprolactam. It has the characteristics of soft touch, moderate strength, good moisture absorption and quick-drying, and is more comfortable to wear than conventional polyester fiber. However, since its main component is still polyester, in order to ensure the quality and warmth retention of products such as clothing and quilts, prevent adulteration, and protect the rights and interests of consumers, it is more difficult to distinguish between polyamide fiber and polyester fiber when testing the proportion of filling material, especially when polyamide fiber and polyester fiber are mixed, it is difficult to conduct quantitative analysis.

[0006] In addition, except for the slight difference in color, polyamide fiber and polyester fiber have similar solubility in various organic solvents and similar appearance under a microscope, making them difficult to distinguish. The commonly used identification method is elemental analysis, that is, determining the nitrogen content in the fiber, but the nitrogen content test has certain limitations, and the test results will be affected by other nitrogen-containing components, such as nylon, nitrogen-containing dyes, nitrogen-containing additives, etc. Therefore, when a mixture of polyamide fiber and polyester fiber is used as a filling material, how to quickly and accurately determine the amount of polyamide fiber in the mixture has become a difficult problem that technicians in the field of functional composite fibers need to solve urgently. Summary of the invention

[0007] In view of the deficiencies in the prior art, the technical problem to be solved by the present invention is to provide a polyamide ester fiber and a preparation method thereof that can quickly and accurately determine the amount of polyamide ester fiber in a mixture when mixed with polyester fiber, thereby solving the deficiencies in traditional nitrogen element analysis and making the analysis results more reliable and having the function of accurately identifying the amount.

[0008] In order to solve the above technical problems, the technical solution adopted by the present invention is: a polyamide ester fiber with a function of accurately identifying dosage, which is prepared by blending polyamide ester polymer slices and modified polyamide ester masterbatch through a composite melt spinning process; the added amount of the modified polyamide ester masterbatch is 1% to 5% of the weight of the polyamide ester polymer slices, and the modified polyamide ester masterbatch is prepared by mixing a mixture of magnesium oxide and barium sulfate nanoparticles with polyamide ester polymer slices through a screw extruder, the mass fraction of the mixture of magnesium oxide and barium sulfate nanoparticles in the modified polyamide ester masterbatch is 2% to 10%, and the mass ratio of magnesium oxide to barium sulfate is 3:7 to 5:5.

[0009] The polyamide ester fiber with the function of accurate dosage identification is characterized in that the added amount of the modified polyamide ester masterbatch is 2% of the weight of the polyamide ester polymer slice.

[0010] The polyamide ester fiber with the function of accurately identifying dosage mentioned above, the mass fraction of the mixture of magnesium oxide and barium sulfate nanoparticles in the modified polyamide ester masterbatch is 5%.

[0011] The polyamide ester fiber with the function of accurately identifying dosage mentioned above, the mass ratio of magnesium oxide to barium sulfate in the modified polyamide ester masterbatch is 4:6.

[0012] The polyamide ester fiber with the function of accurate dosage identification is formed by copolymerization of terephthalic acid, ethylene glycol and caprolactam blocks, with an intrinsic viscosity of 0.60-0.85dl / g and a melting point of 220-240°C, wherein the mass fraction of caprolactam is 10-20%.

[0013] The polyamide ester fiber with the function of accurately identifying the dosage mentioned above has an average particle size of 200-500 nm of the magnesium oxide and barium sulfate nanoparticles.

[0014] A method for preparing polyamide ester fiber with a function of accurately identifying dosage comprises the following steps:

[0015] 1. Preparation of modified polyamide masterbatch

[0016] (1) taking a certain amount of a mixture of magnesium oxide and barium sulfate nanoparticles and a polyamide ester polymer slice for later use;

[0017] (2) adding a mixture of magnesium oxide and barium sulfate nanoparticles into polyamide ester polymer slices in proportion and mixing them evenly;

[0018] (3) preparing modified polyamide masterbatch by screw extruder;

[0019] 2. Preparation of polyamide fiber

[0020] (4) preparing polyamide polyester polymer slices, drying them and setting them aside;

[0021] (5) adding a certain proportion of modified polyamide ester masterbatch and mixing evenly to obtain a blend;

[0022] (6) Melting and extruding the blend through a screw extruder, spinning through a spinning assembly to obtain continuous spun fibers, and performing annular air cooling, drawing, and winding on the spun fibers;

[0023] (7) A polyamide polyester fiber with a single yarn fineness of 0.9 to 3.0 dtex and a function of accurately identifying the dosage is obtained.

[0024] The above-mentioned method for preparing polyamide ester fiber with the function of accurate dosage identification, in the step (2), the mass ratio of the mixture of magnesium oxide and barium sulfate nanoparticles to the polyamide ester polymer slice is 2:98-10:90, the mass ratio of magnesium oxide and barium sulfate in the nanoparticle mixture is 3:7-5:5, and in the step (3), the mass fraction of the mixture of magnesium oxide and barium sulfate nanoparticles in the modified polyamide ester masterbatch is 2%-10%.

[0025] In the above-mentioned method for preparing polyamide ester fiber with the function of accurate dosage identification, in the step (5), the added amount of the modified polyamide ester masterbatch is 1% to 5% of the weight of the polyamide ester polymer slice.

[0026] In the above-mentioned method for preparing polyamide ester fiber with the function of accurate dosage identification, in the step (6), the spinning temperature is 260-270°C, the annular blowing speed is 0.9-1.5 m / s, the cooling temperature is 15-20°C, and the draft ratio is 1.5-3.0.

[0027] The advantages of the polyamide ester fiber with accurate dosage identification function and the preparation method thereof of the present invention are as follows: the present invention aims at the problem that it is difficult to quantitatively analyze the mixture of polyamide ester fiber and polyester fiber, and develops an easily identifiable polyamide ester fiber by adding a specific substance into the polyamide ester fiber. When the fiber is mixed with polyester fiber, the content of the specific substance in the mixture can be measured to perform qualitative and quantitative analysis on the polyamide ester fiber in the mixture. The polyamide ester fiber produced by this technology can be identified by elemental analysis, and the mixture with polyester fiber can be qualitatively and quantitatively analyzed. The defect problem that the test results of traditional nitrogen element analysis are affected by nitrogen-containing components such as other fibers, dyes, and auxiliaries is solved, making the analysis results more reliable and accurate, and taking into account the characteristics of polyamide ester fiber such as soft feel, moderate strength, good moisture absorption and quick drying, etc., to ensure that the fiber still has good wearing performance. DETAILED DESCRIPTION

[0028] The present invention is further described in detail below with reference to specific embodiments.

[0030] A polyamide ester fiber with a precise dosage identification function is prepared by blending polyamide ester polymer slices and modified polyamide ester masterbatches through a composite melt spinning process; the added amount of the modified polyamide ester masterbatches is 1% to 5% of the weight of the polyamide ester polymer slices; the modified polyamide ester masterbatches are prepared by mixing a mixture of magnesium oxide and barium sulfate nanoparticles with polyamide ester polymer slices through a screw extruder; the mass fraction of the mixture of magnesium oxide and barium sulfate nanoparticles in the modified polyamide ester masterbatches is 2% to 10%, and the mass ratio of magnesium oxide to barium sulfate is 3:7 to 5:5.

[0031] The polyamide ester polymer slice used in the present invention is formed by block copolymerization of terephthalic acid, ethylene glycol and caprolactam, has an intrinsic viscosity of 0.60-0.85 dl / g, a melting point of 220-240°C, and a mass fraction of caprolactam of 10-20%. The average particle size of magnesium oxide and barium sulfate nanoparticles is 200-500 nm.

[0032] A method for preparing polyamide ester fiber with a function of accurately identifying dosage comprises the following steps:

[0033] 1. Preparation of modified polyamide masterbatch

[0034] (1) taking a certain amount of a mixture of magnesium oxide and barium sulfate nanoparticles and a polyamide ester polymer slice for later use;

[0035] (2) adding a mixture of magnesium oxide and barium sulfate nanoparticles into polyamide ester polymer slices in proportion and mixing them evenly;

[0036] (3) preparing modified polyamide masterbatch by screw extruder;

[0037] 2. Preparation of polyamide ester fiber

[0038] (4) preparing polyamide polyester polymer slices, drying them and setting them aside;

[0039] (5) adding a certain proportion of modified polyamide ester masterbatch and mixing evenly to obtain a blend;

[0040] (6) Melting and extruding the blend through a screw extruder, spinning through a spinning assembly to obtain continuous spun fibers, and performing annular air cooling, drawing, and winding on the spun fibers;

[0041] (7) A polyamide polyester fiber with a single yarn fineness of 0.9 to 3.0 dtex and a function of accurately identifying the dosage is obtained.

[0042] In step (2), the mass ratio of the mixture of magnesium oxide and barium sulfate nanoparticles to the polyamide ester polymer slice is 2:98-10:90, and the mass ratio of magnesium oxide and barium sulfate in the nanoparticle mixture is 3:7-5:5. In step (3), the mass fraction of the mixture of magnesium oxide and barium sulfate nanoparticles in the modified polyamide ester masterbatch is 2%-10%. In step (5), the amount of the modified polyamide ester masterbatch added is 1%-5% of the weight of the polyamide ester polymer slice. In step (6), the spinning temperature is 260-270°C, the annular blowing speed is 0.9-1.5 m / s, the cooling temperature is 15-20°C, and the draft ratio is 1.5-3.0.

[0043] The present application is described in detail below through specific embodiments. The following embodiments are only partial embodiments of the present application and are not limitations of the present application.

[0044] Example 1

[0045] A polyamide ester fiber with a precise dosage identification function is prepared by blending polyamide ester polymer slices with modified polyamide ester masterbatch through a composite melt spinning process; the addition amount of the modified polyamide ester masterbatch is 1% of the weight of the polyamide ester polymer slices, and the modified polyamide ester masterbatch is prepared by mixing a mixture of magnesium oxide and barium sulfate nanoparticles with polyamide ester polymer slices through a screw extruder, wherein the average particle size of the magnesium oxide and barium sulfate nanoparticles is 200nm. The mass fraction of the mixture of magnesium oxide and barium sulfate nanoparticles in the modified polyamide ester masterbatch is 2%, and the mass ratio of magnesium oxide to barium sulfate is 3:7. The polyamide ester polymer slices are formed by block copolymerization of terephthalic acid, ethylene glycol, and caprolactam, with an intrinsic viscosity of 0.60dl / g and a melting point of 220°C, wherein the mass fraction of caprolactam is 10%.

[0046] A method for preparing polyamide ester fiber with a function of accurately identifying dosage comprises the following steps:

[0047] 1. Preparation of modified polyamide masterbatch

[0048] (1) taking a certain amount of a mixture of magnesium oxide and barium sulfate nanoparticles and a polyamide ester polymer slice for later use;

[0049] (2) adding the magnesium oxide and barium sulfate nanoparticle mixture to the polyamide ester polymer slices in a mass ratio of 2:98 and a mass ratio of magnesium oxide to barium sulfate of 3:7, and mixing them evenly;

[0050] (3) preparing a modified polyamide polyester masterbatch having a mass fraction of 2% of a mixture of magnesium oxide and barium sulfate nanoparticles by a screw extruder;

[0051] 2. Preparation of polyamide fiber

[0052] (4) preparing polyamide polyester polymer slices, drying them and setting them aside;

[0053] (5) adding 1% to 5% by weight of the modified polyamide ester masterbatch of the polyamide ester polymer slice, mixing evenly, and obtaining a blend;

[0054] (6) Melting and extruding the blend through a screw extruder, spinning through a spinning assembly, the spinning temperature is 260° C., to obtain continuous spun fibers, and the spun fibers are subjected to annular air cooling, drawing, and winding treatments, the annular air speed is 0.9 m / s, the cooling temperature is 15° C., and the drawing ratio is 1.5;

[0055] (7) A polyamide polyester fiber with a single yarn fineness of 3.0 dtex and a function of accurately identifying the dosage is obtained.

[0056] Example 2

[0057] A polyamide ester fiber with a precise dosage identification function is prepared by blending polyamide ester polymer slices with modified polyamide ester masterbatch through a composite melt spinning process; the modified polyamide ester masterbatch is added in an amount of 2% of the weight of the polyamide ester polymer slices, and the modified polyamide ester masterbatch is prepared by mixing a mixture of magnesium oxide and barium sulfate nanoparticles with polyamide ester polymer slices through a screw extruder, wherein the average particle size of the magnesium oxide and barium sulfate nanoparticles is 350nm. The mass fraction of the mixture of magnesium oxide and barium sulfate nanoparticles in the modified polyamide ester masterbatch is 5%, and the mass ratio of magnesium oxide to barium sulfate is 4:6. The polyamide ester polymer slices are formed by block copolymerization of terephthalic acid, ethylene glycol, and caprolactam, with an intrinsic viscosity of 0.69dl / g and a melting point of 230°C, wherein the mass fraction of caprolactam is 15%.

[0058] A method for preparing polyamide ester fiber with a function of accurately identifying dosage comprises the following steps:

[0059] 1. Preparation of modified polyamide masterbatch

[0060] (1) taking a certain amount of a mixture of magnesium oxide and barium sulfate nanoparticles and a polyamide ester polymer slice for later use;

[0061] (2) adding the magnesium oxide and barium sulfate nanoparticle mixture to the polyamide ester polymer slices in a mass ratio of 5:95 and a mass ratio of magnesium oxide to barium sulfate of 4:6, and mixing them evenly;

[0062] (3) preparing a modified polyamide polyester masterbatch having a mass fraction of 5% of a mixture of magnesium oxide and barium sulfate nanoparticles by a screw extruder;

[0063] 2. Preparation of polyamide ester fiber

[0064] (4) preparing polyamide polyester polymer slices, drying them and setting them aside;

[0065] (5) adding 1% to 5% by weight of the modified polyamide ester masterbatch of the polyamide ester polymer slice, mixing evenly, and obtaining a blend;

[0066] (6) Melting and extruding the blend through a screw extruder, spinning through a spinning assembly, the spinning temperature is 265° C., to obtain continuous spun fibers, and the spun fibers are subjected to annular air cooling, drawing, and winding treatments, the annular air speed is 1.1 m / s, the cooling temperature is 18° C., and the drawing ratio is 2.0;

[0067] (7) A polyamide polyester fiber with a single fiber fineness of 1.67 dtex and a function of accurately identifying the dosage is obtained. At this time, the total content of the mixture of nano magnesium oxide and barium sulfate in the polyamide polyester fiber is measured to be 1‰.

[0068] Example 3

[0069] A polyamide ester fiber with a precise dosage identification function is prepared by blending polyamide ester polymer slices with modified polyamide ester masterbatch through a composite melt spinning process; the addition amount of the modified polyamide ester masterbatch is 5% of the weight of the polyamide ester polymer slices, and the modified polyamide ester masterbatch is prepared by mixing a mixture of magnesium oxide and barium sulfate nanoparticles with polyamide ester polymer slices through a screw extruder, wherein the average particle size of the magnesium oxide and barium sulfate nanoparticles is 500nm. The mass fraction of the mixture of magnesium oxide and barium sulfate nanoparticles in the modified polyamide ester masterbatch is 10%, and the mass ratio of magnesium oxide to barium sulfate is 5:5. The polyamide ester polymer slices are formed by block copolymerization of terephthalic acid, ethylene glycol, and caprolactam, with an intrinsic viscosity of 0.85dl / g and a melting point of 240°C, wherein the mass fraction of caprolactam is 20%.

[0070] A method for preparing polyamide ester fiber with a function of accurately identifying dosage comprises the following steps:

[0071] 1. Preparation of modified polyamide masterbatch

[0072] (1) taking a certain amount of a mixture of magnesium oxide and barium sulfate nanoparticles and a polyamide ester polymer slice for later use;

[0073] (2) adding the magnesium oxide and barium sulfate nanoparticle mixture to the polyamide ester polymer slices in a mass ratio of 10:90 and a mass ratio of magnesium oxide to barium sulfate of 5:5, and mixing them evenly;

[0074] (3) preparing a modified polyamide polyester masterbatch having a mass fraction of 10% of a mixture of magnesium oxide and barium sulfate nanoparticles by a screw extruder;

[0075] 2. Preparation of polyamide ester fiber

[0076] (4) preparing polyamide polyester polymer slices, drying them and setting them aside;

[0077] (5) adding 1% to 5% by weight of the modified polyamide ester masterbatch of the polyamide ester polymer slice, mixing evenly, and obtaining a blend;

[0078] (6) Melting and extruding the blend through a screw extruder, spinning through a spinning assembly, the spinning temperature is 270° C., to obtain continuous spun fibers, and the spun fibers are subjected to annular air cooling, drawing, and winding treatments, the annular air speed is 1.5 m / s, the cooling temperature is 20° C., and the drawing ratio is 3.0;

[0079] (7) A polyamide polyester fiber with a single yarn fineness of 0.9 dtex and a function of accurately identifying the dosage is obtained.

[0080] The technical solution of the present invention is to add a certain amount of magnesium oxide and barium sulfate mixture as a characteristic substance to the slice or melt before polyamide ester spinning, strictly control the addition ratio of magnesium oxide and barium sulfate, test the content of magnesium and barium elements, and the ratio of magnesium and barium elements by elemental analysis, and comprehensively perform qualitative and quantitative analysis on polyamide ester fibers and their mixtures. The amount of polyamide ester fibers in the mixture can be measured quickly and accurately, solving the shortcomings of traditional nitrogen element analysis, making the analysis results more reliable, and solving the problem that it is difficult to distinguish polyamide ester fibers from polyester fibers when the traditional filler dosage ratio is detected, especially the problem that the polyamide ester dosage detection result is inaccurate when the polyamide ester fibers and polyester fibers are mixed.

[0081] Of course, the above description is not a limitation of the present invention, and the present invention is not limited to the above examples. Any changes, modifications, additions or substitutions made by ordinary technicians in this technical field within the essential scope of the present invention should fall within the protection scope of the present invention.

Claims

1. A polyamide polyester fiber with a function of accurately identifying dosage, characterized in that: The polyamide ester polymer slices are blended with modified polyamide ester masterbatches and prepared by a composite melt spinning process; the modified polyamide ester masterbatch is added in an amount of 1% to 5% of the weight of the polyamide ester polymer slices; the modified polyamide ester masterbatch is prepared by mixing a mixture of magnesium oxide and barium sulfate nanoparticles with polyamide ester polymer slices and by a screw extruder; the mass fraction of the mixture of magnesium oxide and barium sulfate nanoparticles in the modified polyamide ester masterbatch is 2% to 10%, and the mass ratio of magnesium oxide to barium sulfate is 3:7 to 5:

5.

2. The polyamide polyester fiber with accurate dosage identification function according to claim 1 is characterized in that: The added amount of the modified polyamide ester masterbatch is 2% of the weight of the polyamide ester polymer slice.

3. The polyamide ester fiber with accurate dosage identification function according to claim 1 is characterized in that: The mass fraction of the mixture of magnesium oxide and barium sulfate nanoparticles in the modified polyamide ester masterbatch is 5%.

4. The polyamide polyester fiber with accurate dosage identification function according to claim 1 is characterized in that: The mass ratio of magnesium oxide to barium sulfate in the modified polyamide ester masterbatch is 4:

6.

5. The polyamide ester fiber with accurate dosage identification function according to claim 1 is characterized in that: The polyamide ester polymer slice is formed by block copolymerization of terephthalic acid, ethylene glycol and caprolactam, has an intrinsic viscosity of 0.60-0.85 dl / g and a melting point of 220-240° C., wherein the mass fraction of caprolactam is 10-20%.

6. The polyamide polyester fiber with accurate dosage identification function according to claim 1 is characterized in that: The average particle size of the magnesium oxide and barium sulfate nanoparticles is 200-500 nm.

7. A method for preparing the polyamide polyester fiber according to claims 1-6, characterized in that: The steps include:

1. Preparation of modified polyamide masterbatch (1) taking a certain amount of a mixture of magnesium oxide and barium sulfate nanoparticles and a polyamide ester polymer slice for later use; (2) adding a mixture of magnesium oxide and barium sulfate nanoparticles into polyamide ester polymer slices in proportion and mixing them evenly; (3) preparing modified polyamide masterbatch by screw extruder; 2. Preparation of polyamide fiber (4) preparing polyamide polyester polymer slices, drying them and setting them aside; (5) adding a certain proportion of modified polyamide ester masterbatch and mixing evenly to obtain a blend; (6) Melting and extruding the blend through a screw extruder, spinning through a spinning assembly to obtain continuous spun fibers, and performing annular air cooling, drawing, and winding on the spun fibers; (7) A polyamide polyester fiber with a single yarn fineness of 0.9 to 3.0 dtex and a function of accurately identifying the dosage is obtained.

8. The method for preparing polyamide ester fiber with accurate dosage identification function according to claim 7, characterized in that: In the step (2), the mass ratio of the mixture of magnesium oxide and barium sulfate nanoparticles to the polyamide ester polymer slices is 2:98 to 10:90, the mass ratio of magnesium oxide and barium sulfate in the nanoparticle mixture is 3:7 to 5:5, and in the step (3), the mass fraction of the mixture of magnesium oxide and barium sulfate nanoparticles in the modified polyamide ester masterbatch is 2% to 10%.

9. The method for preparing polyamide ester fiber with accurate dosage identification function according to claim 7, characterized in that: In the step (5), the amount of modified polyamide ester masterbatch added is 1% to 5% of the weight of the polyamide ester polymer slice.

10. The method for preparing polyamide ester fiber with accurate dosage identification function according to claim 7, characterized in that: In the step (6), the spinning temperature is 260-270° C., the annular blowing speed is 0.9-1.5 m / s, the cooling temperature is 15-20° C., and the draft ratio is 1.5-3.0.