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CN-121992527-A - Preparation method of high-efficiency Wen Pixin-type composite fiber

CN121992527ACN 121992527 ACN121992527 ACN 121992527ACN-121992527-A

Abstract

The invention belongs to the technical field of sheath-core type composite fibers, and particularly relates to a preparation method of a high-efficiency Wen Pixin-type composite fiber. According to the invention, the dicyclohexylmethane diisocyanate and the monoethanolamine are subjected to addition reaction to generate urea bonds to coordinate with Al 3+ to obtain the aluminum organic ligand, and in the process of melt blending with the PA matrix, al 2 O 3 which is uniformly distributed is generated in situ in the PA matrix, so that the heat conductivity of the skin layer is improved, the heat conductivity of the skin layer and the phase change material in the core layer are combined to realize the synergistic effect of rapid heat conduction and phase change temperature adjustment, and the efficient temperature adjustment and rapid heat conduction and heat dissipation are completed. The high-efficiency Wen Pixin-type composite fiber prepared by the invention can be applied to the fields of home textiles, clothing and the like, and has good temperature sensing capability, and particularly has wider application prospect on mattresses.

Inventors

  • SHAN CHUANLEI
  • JIANG MINGLIANG
  • YANG JINYU

Assignees

  • 邦特云纤(青岛)新材料科技有限公司

Dates

Publication Date
20260508
Application Date
20260227

Claims (10)

  1. 1. The preparation method of the high-efficiency Wen Pixin-degree composite fiber is characterized by comprising the steps of preparing an aluminum organic ligand, preparing a cortex melt and melt spinning; The preparation method of the aluminum organic ligand comprises the steps of dissolving monoethanolamine in tetrahydrofuran, cooling to 0-5 ℃ in an ice bath, slowly adding dicyclohexylmethane diisocyanate, heating to 25-30 ℃ under the protection of nitrogen, reacting for 2-3 hours, removing tetrahydrofuran by rotary evaporation after the reaction is finished, dissolving an addition product in anhydrous dichloromethane, adding anhydrous aluminum chloride, stirring for 8-10 hours at 20-25 ℃, collecting precipitate, washing the precipitate with the anhydrous dichloromethane for 2-3 times, vacuum drying for 4-6 hours at 50-60 ℃, and grinding until D90 is less than or equal to 1 mu m to obtain the aluminum organic ligand.
  2. 2. The preparation method of the efficient Wen Pixin-type composite fiber according to claim 1, wherein the molar ratio of dicyclohexylmethane diisocyanate, monoethanolamine and anhydrous aluminum chloride is 1:2.0-2.2:0.4-0.5; the mass ratio of the monoethanolamine to the tetrahydrofuran is 1:8-10.
  3. 3. The method for preparing the high-efficiency Wen Pixin type composite fiber according to claim 1, wherein the heating rate is 0.5-1 ℃ per minute; The spin steaming temperature is 35-40 ℃, and the vacuum degree is 0.08-0.1 MPa; The mass ratio of the addition product to the anhydrous dichloromethane is 1:8-10; the stirring treatment speed is 150-250 r/min.
  4. 4. The preparation method of the efficient Wen Pixin type composite fiber according to claim 1, wherein the preparation of the sheath melt is that PA6 particles and aluminum organic ligands are premixed at a high speed and then added into a double-screw extruder for melt extrusion, and low-oxygen gas is introduced in the melting process to obtain the sheath melt.
  5. 5. The method for preparing the high-efficiency Wen Pixin type composite fiber according to claim 4, wherein the water content of the PA6 particles is less than or equal to 0.05%; the addition amount of the aluminum organic ligand is 6-8% of the mass of the PA6 particles; the speed of the high-speed premixing is 700-800 rpm, and the time is 5-10 min.
  6. 6. The method for preparing the high-efficiency Wen Pixin-type composite fiber according to claim 4, wherein the temperatures of all the zones in the twin-screw extruder are 235-245 ℃, 240-250 ℃, 250-260 ℃ in the three zones, 260-270 ℃ in the four zones, 255-265 ℃ in the five zones and 200-300 rpm.
  7. 7. The preparation method of the high-efficiency Wen Pixin-type composite fiber according to claim 4, wherein the volume fraction of oxygen in the low-oxygen gas is 5-7%, the balance is nitrogen, and the introducing rate of the low-oxygen gas is 0.5-1L/min.
  8. 8. The preparation method of the high-efficiency blended Wen Pixin type composite fiber according to claim 1, wherein the melt spinning is characterized in that core particles, antioxidants, phase change materials and compatilizers are added into a double-screw extruder to be melt extruded to obtain a core melt, the sheath melt and the core melt are sent into a sheath-core composite spinning component to be extruded, side blowing cooling molding is carried out, and then winding, stretching, shaping, oiling and drying are carried out to obtain the high-efficiency blended Wen Pixin type composite fiber.
  9. 9. The preparation method of the high-efficiency Wen Pixin type composite fiber according to claim 8, wherein the mass ratio of the sheath melt to the core melt is 25-35:65-75; The core layer particles are one of HDPE high-density polyethylene particles, PLA particles and PP particles, and the water content is less than or equal to 0.05%; The addition amount of the antioxidant is 0.1-0.3% of the mass of the core layer particles; the phase change material is one or more of n-octadecane, paraffin, palmitic acid, esters thereof and pentaerythritol, and the addition amount is 8-10% of the mass of the core layer particles; The compatilizer is one of maleic anhydride grafted polyethylene, maleic anhydride grafted polypropylene and maleic anhydride grafted polylactic acid, and the addition amount of the compatilizer is 4-6% of the mass of the core layer particles.
  10. 10. The method for preparing the high-efficiency Wen Pixin type composite fiber according to claim 8, wherein the temperature range of the twin-screw extruder in the melting process of the core melt is 180-240 ℃; the air temperature of the lateral air blower is 20-25 ℃, and the air speed is 0.3-0.5 m/s; The stretching is two-stage stretching, wherein the temperature of the first-stage stretching is 70-80 ℃, the multiple is 2-3 times, the temperature of the second-stage stretching is 80-90 ℃, and the multiple is 1.2-1.5 times; the temperature of the shaping is 90-100 ℃ and the time is 10-15 s.

Description

Preparation method of high-efficiency Wen Pixin-type composite fiber Technical Field The invention belongs to the technical field of sheath-core type composite fibers, and particularly relates to a preparation method of a high-efficiency Wen Pixin type composite fiber. Background Sheath-core type composite fibers are composite fibers in which a sheath layer and a core layer are formed by two polymers along the fiber axial direction respectively, and have the performance advantages of the two polymers at the same time, and are widely applied in the fiber field in recent years. The sheath-core type composite fiber is prepared by taking PP, PE, PLA as a core layer and PA as a skin layer, wherein the skin layer has the advantages of high strength and good wear resistance, and the core layer has better flexibility, so that the prepared sheath-core type composite fiber has better comprehensive performance. If the phase change material is added into the core layer, the intelligent temperature regulation effect of the fiber can be endowed, but the core defects of obvious difference of thermal expansion coefficient and crystallization characteristic of the skin layer and the core layer and poor compatibility exist, stress concentration is easy to occur at the skin-core interface in the processes of melt spinning, stretching and shaping and subsequent dyeing and finishing, so that the phenomena of layering, cracking and the like are caused, the mechanical property of the fiber is influenced, uneven dyeing and color fastness reduction are also caused during dyeing and finishing, the application of the fiber in the textile field is limited, and secondly, after the phase change material is packaged in the core layer, the heat conduction performance of the skin layer is poor, so that the perception sensitivity of the phase change material to the environmental temperature change is insufficient, and the heat absorbed or released in the phase change process is difficult to be quickly transferred to the surface of the fiber, so that the temperature regulation efficiency is greatly reduced. Aiming at the problem of poor heat conductivity of the PA skin layer, the prior art adds heat conducting materials into the skin layer, but the heat conducting materials are mainly inorganic materials, so that the interface compatibility of the PA skin layer and the PA material is poor, the strength of the skin layer is influenced, the local heat conduction is uneven due to poor dispersibility, the improvement effect on the overall temperature sensing sensitivity of the fiber is not obvious, and meanwhile, the separation phenomenon of the PA skin layer and the core layer is aggravated by aggregation of the heat conducting materials. Therefore, there is a need to develop a temperature regulating fiber preparation technology capable of simultaneously solving the compatibility of the sheath and the core and improving the thermal conductivity of the sheath. Disclosure of Invention In order to solve the problems in the prior art, the invention provides a preparation method of a high-efficiency Wen Pixin-type composite fiber, which achieves the aims of improving the sheath-core compatibility and the temperature regulation efficiency of the sheath-core type composite fiber. In order to solve the technical problems, the invention adopts the following technical scheme: A preparation method of a high-efficiency Wen Pixin-degree composite fiber, which comprises the following steps: S1, preparation of aluminum organic ligand Dissolving monoethanolamine in tetrahydrofuran, cooling to 0-5 ℃ in an ice bath, slowly adding dicyclohexylmethane diisocyanate, heating to 25-30 ℃ under the protection of nitrogen, reacting for 2-3 hours, generating urea bonds by the addition reaction of dicyclohexylmethane diisocyanate and monoethanolamine, removing tetrahydrofuran by rotary evaporation after the reaction is finished, dissolving an addition product in anhydrous dichloromethane, adding anhydrous aluminum chloride, stirring for 8-10 hours at 20-25 ℃, coordinating urea bonds in the addition product with Al 3+, collecting precipitate, washing the precipitate with the anhydrous dichloromethane for 2-3 times, vacuum drying for 4-6 hours at 50-60 ℃, and grinding until D90 is less than or equal to 1 mu m to obtain the aluminum organic ligand. Preferably, the molar ratio of dicyclohexylmethane diisocyanate, monoethanolamine and anhydrous aluminum chloride is 1:2.0-2.2:0.4-0.5. Preferably, the mass ratio of the monoethanolamine to the tetrahydrofuran is 1:8-10. Preferably, the anhydrous aluminum chloride is added for 3-4 times, and the divided addition can avoid the defect of insufficient dispersibility of the aluminum chloride, so that the anhydrous aluminum chloride is in a suspension dispersion state in the anhydrous dichloromethane, and coordination can be promoted. Preferably, the temperature rising rate is 0.5-1 ℃ per minute. Preferably, the spin steaming temperatu