Cool-feeling master batch for polyamide 66 fiber as well as preparation method and application of cool-feeling master batch

Abstract

The invention discloses a cool master batch for polyamide 66 fiber as well as a preparation method and application of the cool master batch. The cool master batch provided by the invention is prepared from the following components: polyamide 66 resin, a cool auxiliary agent and a composite dispersing agent, the composite dispersing agent is formed by compounding montan wax and an amide dispersing agent. The cool master batch provided by the invention has excellent spinnability, is excellent in performance in polyamide 66 civil filament fibers, has a qmax value far exceeding the national standard, can provide reliable material selection for continuous production of cool polyamide 66 civil filament fibers, and is pure white in color and simple in preparation method.

Description

Technical Field

[0001] The invention belongs to the technical field of functional masterbatches and resin modification, and particularly relates to a cooling masterbatch for polyamide 66 fiber and a preparation method and application thereof. Background Art

[0002] Chemical fiber masterbatch is the core raw material for coloring and functional modification of chemical fiber stock solution. It is mainly used in the production process of chemical fiber products to give the fiber specific color and function. As an important raw and auxiliary material, chemical fiber masterbatch is an important innovative factor for fiber differentiation and functionalization.

[0003] Patent CN116285323A discloses a cool anti-ultraviolet masterbatch, which includes a base material and a composite powder dispersed in the base material, wherein the mass ratio of the base material to the composite powder is 5:1-1.5; the composite powder is a mixed powder of mica powder, calcite powder and zinc oxide powder. The mica powder and calcite powder in the product are both natural minerals, and the quality control cannot be well controlled.

[0004] Patent CN115124831A discloses a cool nylon blend and its application, wherein the cool nylon blend uses granular aluminum nitride and flaky boron nitride to form a filler network structure, improves the thermal conductivity of the composite cool masterbatch, enables it to obtain a good continuous cool effect at a lower content, and ensures the good spinnability of the blend; at the same time, aluminum nitride and boron nitride have a mutually promoting dispersion effect, which can effectively improve the uniform dispersion of the composite cool masterbatch in the nylon resin. However, the aluminum nitride and boron nitride in this product are expensive, and the color is gray, which affects the color of the fiber fabric. In addition, the lamellar boron nitride has poor dispersibility in the polyurethane resin. Summary of the invention

[0005] The present invention aims to provide a cool masterbatch for polyamide 66 fiber and a preparation method thereof, wherein the cool masterbatch exhibits excellent spinnability and performs well in polyamide 66 civilian filament fibers. q max The value is far higher than the national standard, which can provide a reliable material choice for the continuous production of cool polyamide 66 civilian filament fibers. At the same time, the masterbatch is white in color and has a simple preparation method.

[0006] In order to achieve the above object, the technical solution adopted by the present invention is as follows: In a first aspect, the present invention provides a cooling masterbatch, comprising the following components: polyamide 66 resin, a cooling aid and a composite dispersant; the composite dispersant is composited by montan wax and an amide dispersant.

[0007] In the present invention, the amide dispersant is selected from one or more of vinyl bisstearamide, erucic acid amide and oleic acid amide. Vinyl bisstearic acid amide is preferred. Studies have shown that the compounding of amide dispersants and montan wax is more favorable for the dispersion of the cooling agent in the polyamide resin.

[0008] In the present invention, the mass ratio of the montan wax to the amide dispersant is 1:1.

[0009] In the present invention, the cooling masterbatch comprises the following components by mass fraction: 75-87% polyamide 66 resin, 10-20% cooling agent, and 3-5% composite dispersant. Studies have shown that within this range, the cooling masterbatch has excellent spinnability and high q max Value, comprehensive performance is better.

[0010] In the present invention, the polyamide 66 resin is a highly glossy polyamide 66 resin, and its relative viscosity ranges from 2.40 to 2.80. The highly glossy polyamide 66 resin refers to a polyamide 66 resin that does not contain a matting agent component and has a titanium dioxide content of 0.

[0011] In the present invention, the cooling agent is selected from one or more of titanium dioxide, barium titanate and jade powder; the particle size of the cooling agent is 300-500nm. Studies have shown that the cooling agent can be better dispersed in the polyamide resin under the action of the composite dispersant, which is beneficial to improve the cooling effect of the masterbatch.

[0012] In a second aspect, the present invention provides a method for preparing the above-mentioned cooling masterbatch, comprising the following steps: mixing the components, adding them into a twin-screw extruder, melt extruding and plasticizing, screw shearing, water cooling and pelletizing, and vacuum drying.

[0013] In the present invention, the temperature of each temperature zone in the melt extrusion plasticization is controlled as follows: The temperature in the first temperature zone is 255-270℃; The temperature in the second temperature zone is 265-280℃; The temperature in the third temperature zone is 265-280℃; The temperature in the fourth temperature zone is 255-270°C; The temperature in the fifth temperature zone is 255-270°C; The temperature of the sixth temperature zone is 260-280℃; The temperature of the seventh temperature zone is 260-280℃; The temperature of the eighth temperature zone is 255-270℃; The temperature of the ninth temperature zone is 250-270℃; The temperature of the tenth temperature zone is 250-270℃; The temperature in the eleventh temperature zone is 265-285°C; The temperature in the twelfth temperature zone is 265-285℃.

[0014] In the present invention, the temperature of the main engine head temperature zone of the screw shearing is 270-290°C.

[0015] By controlling the temperature of the above-mentioned temperature zones and the temperature zone of the main engine head of the screw shearing, it is helpful to mix the materials more fully, thereby improving the cooling effect and spinnability of the masterbatch.

[0016] In the present invention, a filter screen with a mesh size of 200-500 is added to the main machine head of the screw shearing machine to control the stability of the melt pressure and the stability of the screw transmission shearing, which is conducive to the uniform dispersion of the cooling agent in the polyamide matrix.

[0017] In the present invention, the overall melt pressure of the main engine die head controlling the screw shearing is between 1.0-1.5 MPa.

[0018] In the present invention, the main engine speed of the screw shearing is 280-380r / min.

[0019] In a third aspect, the present invention provides a polyamide 66 fiber, the raw materials of which include the above-mentioned cooling masterbatch.

[0020] Compared with the prior art, the present invention has the following beneficial effects: The present invention selects a specific composite dispersant for use with a cooling aid, wherein the melting point of montan wax is about 90°C and there are multiple anchoring points, so that the cooling aid is better coated and plays a role of pre-dispersion; the melting point range of the amide dispersant is 139-144°C, and it is the same amide material as polyamide 66, so it has good compatibility in polyamide resin. Therefore, in the process of screw shearing dispersion, under the action of the composite dispersant, the cooling aid can be uniformly infiltrated and dispersed in the polyamide resin, thereby improving the cooling performance of the masterbatch.

[0021] The polyamide 66 cool masterbatch provided by the present invention exhibits excellent spinnability, especially in polyamide 66 civilian filament fibers. q max The value is far higher than the national standard, which can provide a reliable material choice for the continuous production of cool polyamide 66 civilian filament fiber or staple fiber. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 These are actual photos of the cooling masterbatch for polyamide 66 fiber prepared in Example 1 and Comparative Example 1 of the present invention; the left one is Comparative Example 1, and the right one is Example 1.

[0023] Figure 2This is a scanning electron microscope photograph of the cooling masterbatch for polyamide 66 fiber prepared in Example 1 of the present invention. DETAILED DESCRIPTION

[0024] The present invention will be further described below in conjunction with specific embodiments, but the present invention is not limited to the following embodiments.

[0025] The resins, additives, etc. used in the following examples, unless otherwise specified, can be obtained from commercial sources; The experimental methods in the following examples are all conventional methods unless otherwise specified.

[0026] The moisture content of the masterbatch was analyzed using a Karl Fischer moisture analyzer of model 831+885 purchased from Metrohm AG. China Ltd.

[0027] The masterbatch micromorphology test was performed using an Apreo 2S HiVac field emission scanning electron microscope (SEM) spectrometer purchased from Thermo Fisher.

[0028] The masterbatch melt index analysis was conducted using an Mflow melt index meter purchased from ZwickRoell GmbH & Co. KG.

[0029] The color data L value of the masterbatch was determined using a NF3010 spectrophotometer purchased from Beijing Jianneng Technology Co., Ltd.

[0030] The relative viscosity analysis of the masterbatch was conducted using an IDS-4-4-0-4 automatic viscosity tester purchased from Hangzhou Zhenyue Technology Co., Ltd. / Shanghai Bingjing Instrument Equipment Co., Ltd.

[0031] The fiber fineness test was conducted using a yarn length measuring machine of model YG086 purchased from Wenzhou Darong Textile Instrument Co., Ltd.

[0032] The fiber breaking strength and fiber breaking elongation tests were conducted using a 1kN Zwicki fiber fabric universal testing machine purchased from Zwick Roy Company.

[0033] In the following embodiments: The composite dispersant is prepared by mixing montan wax and amide dispersant vinyl bisstearamide in a mass ratio of 1:1.

[0034] The polyamide 66 resin is a high gloss polyamide 66 resin, and its relative viscosity ranges from 2.40 to 2.80.

[0035] Example 1 A cooling masterbatch for polyamide 66 fiber has a formula, calculated by mass percentage, of 85% spinning-grade bright polyamide 66 resin powder (with a particle size of about 200 mesh, purchased from Huafeng Group), 12% titanium dioxide (in powder form, with a D50 of 300 nm, purchased from Shanghai Yutong Chemical Technology Co., Ltd.), and 3% composite dispersant (in powder form, with a slightly yellow hue).

[0036] The preparation method of the above-mentioned cool masterbatch for polyamide 66 fiber is as follows: Weigh the corresponding raw materials according to the above formula in proportion and place them in a tray, then carefully place them in the experimental high-speed mixer. Premixing: Place the weighed raw materials in a high-speed mixer (Suzhou Siken Machinery Co., Ltd., model SHR20) and stir them at room temperature for 5 minutes, then carefully pour the premixed raw materials into the main feeding hopper of the twin-screw extruder.

[0037] In the extrusion process, the temperature of each temperature zone is controlled as follows: the temperature of the first temperature zone is 255℃; the temperature of the second temperature zone is 265℃; the temperature of the third temperature zone is 265℃; the temperature of the fourth temperature zone is 255℃; the temperature of the fifth temperature zone is 255℃; the temperature of the sixth temperature zone is 260℃; the temperature of the seventh temperature zone is 260℃; the temperature of the eighth temperature zone is 255℃; the temperature of the ninth temperature zone is 250℃; the temperature of the tenth temperature zone is 250℃; the temperature of the eleventh temperature zone is 265℃; the temperature of the twelfth temperature zone is 265℃; the temperature of the head temperature zone is 270℃. A 200-mesh filter is added to the head of the screw shearing main machine to control the overall melt pressure of the head to be stable to 1.2MPa.

[0038] After melt extrusion and plasticization, the processes of screw shearing, water-cooling pelletizing and vacuum drying are carried out in sequence to prepare the cool polyamide 66 masterbatch; wherein the main engine speed of the screw shearing is 300r / min.

[0039] Example 2 A cooling masterbatch for polyamide 66 fiber has a formula, calculated by mass percentage, of 83% spinning-grade bright polyamide 66 resin powder (with a particle size of about 200 mesh, purchased from Huafeng Group), 12% titanium dioxide (in powder form, with a D50 of 300 nm, purchased from Shanghai Yutong Chemical Technology Co., Ltd.), and 5% composite dispersant (in powder form, with a slightly yellow hue).

[0040] The preparation method of the above-mentioned cool masterbatch for polyamide 66 fiber is as follows: Weigh the corresponding raw materials according to the above formula in proportion and place them in a tray, then carefully place them in the experimental high-speed mixer. Premixing: Place the weighed raw materials in a high-speed mixer (Suzhou Siken Machinery Co., Ltd., model SHR20) and stir for 5 minutes, then carefully pour the premixed raw materials into the main feeding hopper of the twin-screw extruder.

[0041] In the extrusion process, the temperature of each temperature zone is controlled as follows: the temperature of the first temperature zone is 255℃; the temperature of the second temperature zone is 265℃; the temperature of the third temperature zone is 265℃; the temperature of the fourth temperature zone is 255℃; the temperature of the fifth temperature zone is 255℃; the temperature of the sixth temperature zone is 260℃; the temperature of the seventh temperature zone is 260℃; the temperature of the eighth temperature zone is 255℃; the temperature of the ninth temperature zone is 250℃; the temperature of the tenth temperature zone is 250℃; the temperature of the eleventh temperature zone is 265℃; the temperature of the twelfth temperature zone is 265℃; the temperature of the head temperature zone is 270℃. A 200-mesh filter is added to the head of the screw shearing main machine to control the overall melt pressure of the head to be stable to 1.0MPa.

[0042] After melt extrusion and plasticization, the processes of screw shearing, water-cooling pelletizing and vacuum drying are carried out in sequence to prepare the cool polyamide 66 masterbatch; wherein the main engine speed of the screw shearing is 300r / min.

[0043] Example 3 A cooling masterbatch for polyamide 66 fiber has a formula, calculated by mass percentage, of 75% spinning-grade bright polyamide 66 resin powder (with a particle size of about 200 mesh, purchased from Huafeng Group), 20% titanium dioxide (in powder form, with a D50 of 300 nm, purchased from Shanghai Yutong Chemical Technology Co., Ltd.), and 5% composite dispersant (in powder form, with a slightly yellow hue).

[0044] The preparation method of the above-mentioned cool masterbatch for polyamide 66 fiber is as follows: Weigh the corresponding raw materials according to the above formula in proportion and place them in a tray, then carefully place them in the experimental high-speed mixer. Premixing: Place the weighed raw materials in a high-speed mixer (Suzhou Siken Machinery Co., Ltd., model SHR20) and stir for 5 minutes, then carefully pour the premixed raw materials into the main feeding hopper of the twin-screw extruder to avoid dust.

[0045] In the extrusion process, the temperature of each temperature zone is controlled as follows: the temperature of the first temperature zone is 255℃; the temperature of the second temperature zone is 265℃; the temperature of the third temperature zone is 265℃; the temperature of the fourth temperature zone is 255℃; the temperature of the fifth temperature zone is 255℃; the temperature of the sixth temperature zone is 260℃; the temperature of the seventh temperature zone is 260℃; the temperature of the eighth temperature zone is 255℃; the temperature of the ninth temperature zone is 250℃; the temperature of the tenth temperature zone is 250℃; the temperature of the eleventh temperature zone is 265℃; the temperature of the twelfth temperature zone is 265℃; the temperature of the head temperature zone is 270℃. A 200-mesh filter is added to the head of the screw shearing main machine to control the overall melt pressure of the head to be stable to 1.4MPa.

[0046] After melt extrusion and plasticization, the processes of screw shearing, water-cooling pelletizing and vacuum drying are carried out in sequence to prepare a cool polyamide 66 masterbatch; wherein the main engine speed of the screw shearing is 320r / min.

[0047] Comparative Example 1 The difference from Example 1 is that the cooling agent is different, and titanium dioxide is replaced by aluminum oxide, as follows: A cooling masterbatch for polyamide 66 fiber has a formula, calculated by mass percentage, of 85% spinning-grade bright polyamide 66 resin powder (with a particle size of about 200 mesh, purchased from Huafeng Group), 12% aluminum oxide (in powder form, with a D50 of 850 nm, purchased from Zibo Xiyan Nanomaterial Co., Ltd.), and 3% composite dispersant (in powder form, with a slightly yellow hue).

[0048] The preparation method of the above-mentioned cool masterbatch for polyamide 66 fiber is as follows: Weigh the corresponding raw materials according to the above formula in proportion and place them in a tray, then carefully place them in the experimental high-speed mixer. Premixing: Place the weighed raw materials in a high-speed mixer (Suzhou Siken Machinery Co., Ltd., model SHR20) and stir for 5 minutes, then carefully pour the premixed raw materials into the main feeding hopper of the twin-screw extruder to avoid dust.

[0049] In the extrusion process, the temperature of each temperature zone is controlled as follows: the temperature of the first temperature zone is 255℃; the temperature of the second temperature zone is 265℃; the temperature of the third temperature zone is 265℃; the temperature of the fourth temperature zone is 255℃; the temperature of the fifth temperature zone is 255℃; the temperature of the sixth temperature zone is 260℃; the temperature of the seventh temperature zone is 260℃; the temperature of the eighth temperature zone is 255℃; the temperature of the ninth temperature zone is 250℃; the temperature of the tenth temperature zone is 250℃; the temperature of the eleventh temperature zone is 265℃; the temperature of the twelfth temperature zone is 265℃; the temperature of the head temperature zone is 270℃. A 200-mesh filter is added to the head of the screw shearing main machine to control the overall melt pressure of the head to be stable to 1.1MPa.

[0050] After melt extrusion and plasticization, the processes of screw shearing, water-cooling pelletizing and vacuum drying are carried out in sequence to prepare the cool polyamide 66 masterbatch; wherein the main engine speed of the screw shearing is 300r / min.

[0051] Comparative Example 2 The only difference from Example 3 is that titanium dioxide is replaced by aluminum oxide, as follows: A cooling masterbatch for polyamide 66 fiber has a formula, calculated by mass percentage, of 75% spinning-grade bright polyamide 66 resin powder (with a particle size of about 200 mesh, purchased from Huafeng Group), 20% aluminum oxide (in powder form, with a D50 of 850 nm, purchased from Zibo Xiyan Nanomaterial Co., Ltd.), and 5% composite dispersant (in powder form, with a slightly yellow hue).

[0052] The preparation method of the above-mentioned cool masterbatch for polyamide 66 fiber is as follows: Weigh the corresponding raw materials according to the above formula in proportion and place them in a tray, then carefully place them in the experimental high-speed mixer. Premixing: Place the weighed raw materials in a high-speed mixer (Suzhou Siken Machinery Co., Ltd., model SHR20) and stir for 5 minutes, then carefully pour the premixed raw materials into the main feeding hopper of the twin-screw extruder to avoid dust.

[0053] In the extrusion process, the temperature of each temperature zone is controlled as follows: the temperature of the first temperature zone is 255℃; the temperature of the second temperature zone is 265℃; the temperature of the third temperature zone is 265℃; the temperature of the fourth temperature zone is 255℃; the temperature of the fifth temperature zone is 255℃; the temperature of the sixth temperature zone is 260℃; the temperature of the seventh temperature zone is 260℃; the temperature of the eighth temperature zone is 255℃; the temperature of the ninth temperature zone is 250℃; the temperature of the tenth temperature zone is 250℃; the temperature of the eleventh temperature zone is 265℃; the temperature of the twelfth temperature zone is 265℃; the temperature of the head temperature zone is 270℃. A 200-mesh filter is added to the head of the screw shearing main machine to control the overall melt pressure of the head to be stable to 1.2MPa.

[0054] After melt extrusion and plasticization, the processes of screw shearing, water-cooling pelletizing and vacuum drying are carried out in sequence to prepare a cool polyamide 66 masterbatch, wherein the main engine speed of the screw shearing is 300r / min.

[0055] Comparative Example 3 A cooling masterbatch for polyamide 66 fiber has a formula, calculated by mass percentage, of 85% spinning-grade bright polyamide 66 resin powder (particle size of about 200 mesh, purchased from Huafeng Group), 12% titanium dioxide (in powder form, with D50 of 300 nm, purchased from Shanghai Yutong Chemical Technology Co., Ltd.), and 3% single dispersant vinyl bisstearamide (in white powder form, purchased from Clariant Chemicals (China) Co., Ltd.).

[0056] The preparation method of the above-mentioned cool masterbatch for polyamide 66 fiber is as follows: Weigh the corresponding raw materials according to the above formula in proportion and place them in a tray, then carefully place them in the experimental high-speed mixer. Premixing: Place the weighed raw materials in a high-speed mixer (Suzhou Siken Machinery Co., Ltd., model SHR20) and stir them at room temperature for 5 minutes, then carefully pour the premixed raw materials into the main feeding hopper of the twin-screw extruder.

[0057] In the extrusion process, the temperature of each temperature zone is controlled as follows: the temperature of the first temperature zone is 255℃; the temperature of the second temperature zone is 265℃; the temperature of the third temperature zone is 265℃; the temperature of the fourth temperature zone is 255℃; the temperature of the fifth temperature zone is 255℃; the temperature of the sixth temperature zone is 260℃; the temperature of the seventh temperature zone is 260℃; the temperature of the eighth temperature zone is 255℃; the temperature of the ninth temperature zone is 250℃; the temperature of the tenth temperature zone is 250℃; the temperature of the eleventh temperature zone is 265℃; the temperature of the twelfth temperature zone is 265℃; the temperature of the head temperature zone is 270℃. A 200-mesh filter is added to the head of the screw shearing main machine to control the overall melt pressure of the head to be stable to 1.1MPa.

[0058] After melt extrusion and plasticization, the processes of screw shearing, water-cooling pelletizing and vacuum drying are carried out in sequence to prepare the cool polyamide 66 masterbatch; wherein the main engine speed of the screw shearing is 300r / min.

[0059] Test Case 1. Cooling Masterbatch (1) Physical parameters The physical property parameters of the cooling masterbatch for polyamide 66 fiber prepared in the above Examples 1-3 and Comparative Examples 1-3 were tested, and the results were as follows.

[0060] Table 1 Physical properties of cool masterbatch for polyamide 66 fiber

[0061] As shown in Table 1, the cooling masterbatch finally prepared in Examples 1-3 has a moisture content of 300-500 ppm, a melt index of 30-45 g / 10 min, and a relative viscosity of 1.9-2.2.

[0062] Comparing Comparative Example 1 with Example 1, and Comparative Example 2 with Example 3, the cool masterbatch obtained in Example 1 and Example 3 has a higher relative viscosity, a lower water content and a melt index, indicating that compared with aluminum oxide, the compounding effect of titanium dioxide and the composite dispersant is better, and the composite dispersant can make titanium dioxide more dispersed in the polyamide resin powder.

[0063] Comparing Comparative Example 3 with Example 1, compared with a single dispersant, the composite dispersant is more conducive to the dispersion of the cooling aid, thereby reducing the melt index and moisture content of the cooling masterbatch.

[0064] Comparing Examples 1-3, as the proportion of spinning-grade bright polyamide 66 resin powder decreases and the proportions of cooling aid A and dispersant increase, the moisture content of the obtained cooling masterbatch also increases, the relative viscosity decreases, and the melt index increases. This shows that by adjusting the proportions of titanium dioxide and dispersant, cooling masterbatches with different moisture contents and melt indexes can be obtained, thereby meeting different actual needs.

[0065] (2) Color like Figure 1 As shown, the left side is comparative example 1, and the right side is embodiment 1; after testing, the L value of comparative example 1 is 92, and the L value of embodiment 1 is 97. By comparison, it can be seen that the color of the cool masterbatch prepared in embodiment 1 is whiter.

[0066] (3) Microstructure Depend on Figure 2 It can be seen that the particle size of the titanium dioxide nanopowder is about 300 nm and is evenly dispersed in the polyamide 66 resin, indicating that the dispersant and extrusion process in Example 1 are conducive to the dispersion of the titanium dioxide nanopowder.

[0067] 2. Filament fiber containing cool masterbatch (1) q max value The polyamide 66 fiber cool masterbatch prepared in the above-mentioned embodiments 1-3 and comparative examples 1-3 was used to directly spin polyamide 66 civilian pre-oriented filament fibers with a specification of 50D / 36F, and then subjected to a stretch treatment to produce low-elastic yarns with a specification of 42D / 36F. The addition ratio of the masterbatch in each embodiment and comparative example, q max The values ​​are shown in Table 2.

[0068] q max The value is defined in the textile contact coolness test as follows: In the textile contact instant coolness test, a heat detection plate (the temperature of the heat detection plate is higher than the temperature of the sample carrier by Δt) is placed on the surface of the test sample (simulating the contact of fabric with human skin), and the peak value of the heat flux density is q max value.

[0069] The national standard GBT 35263-2017 "Testing and Evaluation of the Instantaneous Cooling Performance of Textiles" stipulates that under a temperature difference of 15°C, q max When the value is above 0.15, it is considered to have a cooling effect.

[0070] Table 2 Addition ratio of cool masterbatch in cool polyamide 66 civilian filament fiber q max value

[0071] It can be seen from Table 2 that the cooling performance of textiles can be improved when the addition ratio of cooling masterbatch is 5% and 8%, and as the addition ratio of cooling masterbatch increases, the cooling performance also increases.

[0072] Under the premise of the same addition ratio, the q max It is obviously better than Comparative Example 1 and Comparative Example 2, indicating that compared with aluminum oxide, the combined use of titanium dioxide and the composite dispersant can significantly improve the cooling effect of the masterbatch.

[0073] At the same time, under the premise of the same addition ratio, by comparing Comparative Example 3 with Example 1, it can be seen that compared with a single dispersant, the composite dispersant can make the titanium dioxide dispersed to a better degree and significantly improve the cooling effect of the masterbatch.

[0074] (1) Physical properties The fineness, breaking strength and breaking elongation of the polyamide 66 civilian filament fibers produced by the cooling masterbatch of the polyamide 66 fibers prepared in Examples 1-3 and Comparative Examples 1-3 were tested, and the results are as follows.

[0075] Table 3 Physical properties of cool polyamide 66 civilian filament fibers

[0076] It can be seen from Table 3 that at the same addition ratio, the filament fibers added with the cooling masterbatch prepared in Examples 1-3 have higher breaking strength and breaking elongation.

[0077] Similarly, the present invention also uses erucamide and oleamide to replace vinyl bisstearamide, and uses barium titanate and jade powder to replace titanium dioxide. Experiments show that after the replacement, the masterbatch can achieve a better cooling effect.

[0078] Although the present invention has been described in detail above with general descriptions and specific embodiments, it is obvious to those skilled in the art that some modifications or improvements may be made thereto based on the present invention. Therefore, these modifications or improvements made without departing from the spirit of the present invention all fall within the scope of protection claimed by the present invention.

Claims

1. A cooling masterbatch, comprising the following components: polyamide 66 resin, a cooling aid and a composite dispersant; The composite dispersant is composited from montan wax and amide dispersants.

2. The cool feeling masterbatch according to claim 1, characterized in that The amide dispersant is selected from one or more of vinyl bisstearamide, erucamide and oleamide.

3. The cool feeling masterbatch according to claim 1 or 2, characterized in that: The mass ratio of the montan wax to the amide dispersant is 1:

1.

4. The cool feeling masterbatch according to any one of claims 1 to 3, characterized in that The cooling masterbatch comprises the following components in mass fractions: 75-87% of polyamide 66 resin, 10-20% of cooling aid, and 3-5% of composite dispersant.

5. The cool feeling masterbatch according to any one of claims 1 to 4, characterized in that The polyamide 66 resin is a high-gloss polyamide 66 resin, and its relative viscosity ranges from 2.40 to 2.

80.

6. The cool feeling masterbatch according to any one of claims 1 to 5, characterized in that: The cooling agent is selected from one or more of titanium dioxide, barium titanate and jade powder; The particle size of the cooling agent is 300-500 nm.

7. The method for preparing the cooling masterbatch according to any one of claims 1 to 6, comprising the steps of mixing the components, adding them into a twin-screw extruder, melt extruding and plasticizing, screw shearing, water cooling and pelletizing, and vacuum drying.

8. The preparation method according to claim 7, characterized in that: The temperature of each temperature zone in the melt extrusion plasticization is controlled as follows: The temperature in the first temperature zone is 255-270℃; The temperature in the second temperature zone is 265-280℃; The temperature in the third temperature zone is 265-280℃; The temperature in the fourth temperature zone is 255-270°C; The temperature in the fifth temperature zone is 255-270°C; The temperature of the sixth temperature zone is 260-280℃; The temperature of the seventh temperature zone is 260-280℃; The temperature of the eighth temperature zone is 255-270℃; The temperature of the ninth temperature zone is 250-270℃; The temperature of the tenth temperature zone is 250-270℃; The temperature in the eleventh temperature zone is 265-285°C; The temperature in the twelfth temperature zone is 265-285℃.

9. The preparation method according to claim 7 or 8, characterized in that: The temperature of the main engine head temperature zone of the screw shearing is 270-290°C; Add a 200-500 mesh filter at the main machine head of the screw shearing machine; The main engine speed of the screw shearing is 280-380r / min; The overall melt pressure of the main engine die head controlling the screw shearing is between 1.0-1.5 MPa.

10. A polyamide 66 fiber, the raw material of which comprises the cooling masterbatch according to any one of claims 1 to 6.

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