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CN-116926774-B - Unidirectional moisture-conducting warm-keeping polylactic acid flocculus, and preparation method and application thereof

CN116926774BCN 116926774 BCN116926774 BCN 116926774BCN-116926774-B

Abstract

The invention provides a unidirectional moisture-conducting warm-keeping polylactic acid flocculus, and a preparation method and application thereof, and belongs to the technical field of functional materials. The unidirectional moisture-conducting thermal polylactic acid flocculus provided by the invention is obtained by needling a fiber web, wherein the preparation raw materials of the fiber web comprise hollow polylactic acid fibers, and the pore size is increased from the upper surface to the lower surface of the unidirectional moisture-conducting thermal polylactic acid flocculus. The polylactic acid flocculus provided by the invention has better unidirectional moisture permeability and warmth retention property.

Inventors

  • ZHENG YIMING
  • CAO JIANDA
  • MA HUI
  • ZHENG WEIXING

Assignees

  • 苏州德祺运动科技有限公司

Dates

Publication Date
20260505
Application Date
20230720

Claims (6)

  1. 1. The preparation method of the unidirectional moisture-conducting warm-keeping polylactic acid flocculus is characterized by comprising the following steps of: Providing a fiber web, wherein the fiber web is prepared from only hollow polylactic acid fibers or a mixture of hollow polylactic acid fibers and non-hollow polylactic acid fibers; The fiber web is needled to obtain unidirectional wet-guiding thermal polylactic acid flocculus with gradually increased pore sizes from the upper surface to the lower surface, wherein the needling comprises needling of an upper needle plate and needling of a lower needle plate, or needling of the upper needle plate, the needling conditions comprise that the needling depth of each needling of the upper needle plate is not equal and is different, the needling depth of each needling of the lower needle plate is not equal and is different, the needling number of each needling of the lower needle plate is smaller than the needling number of the upper needle plate, the total needling density of the lower needle plate is smaller than the total needling density of the upper needle plate, the maximum needling depth of each needling of the lower needle plate and the needling of the upper needle plate is 1/2 of the thickness of the unidirectional wet-guiding thermal polylactic acid flocculus, the sum of the needling depths of the needling of the lower needle plate and the needling of the upper needle plate is smaller than the thickness of the unidirectional wet-guiding polylactic acid flocculus, the needling depth of each needling of the upper needle plate is 1-3 tracks, the needling number of the needle plate is 0-2 tracks, the needling depth of the lower needle plate is not equal to 2 tracks, the total needling depth of the needle plate is not equal to 6 cm, and the needling depth of the needle plate is not equal to 6 cm and the needle plate is not equal to 6 cm; The method comprises the steps of needling, carrying out corona treatment on the lower surface of a flocculus precursor obtained after needling, wherein the voltage of the corona treatment is 6-12 kV, and the unidirectional moisture-conducting thermal polylactic acid flocculus is obtained, and the pore size is increased from the upper surface to the lower surface of the unidirectional moisture-conducting thermal polylactic acid flocculus.
  2. 2. The method according to claim 1, wherein the raw material for production further comprises non-hollow polylactic acid fibers, and the content of the non-hollow polylactic acid fibers in the raw material for production is not more than 90wt%.
  3. 3. The preparation method of the hollow polylactic acid fiber according to claim 2, wherein the specification of the hollow polylactic acid fiber comprises fineness of 2.5-7D, length of 38-105 mm and hollowness of 15-25%, and the specification of the non-hollow polylactic acid fiber comprises fineness of 0.8-7D and length of 38-105 mm.
  4. 4. The preparation method of any one of claims 1-3, wherein the unidirectional moisture-conducting warm-keeping polylactic acid wadding has an areal density of 30-350 g/m 2 and a thickness of 3-25 mm; The moisture conductivity change rate of the unidirectional moisture-conducting heat-preserving polylactic acid flocculus is 3-30%, and is calculated according to a formula shown in a formula I: A= (a 1 -A 2 )/A 1 x 100% formula I; In the formula I, A is the change rate of the moisture conductivity of the unidirectional moisture-conducting warm-keeping polylactic acid flocculus, A 1 is the moisture conductivity from the lower surface to the upper surface, and A 2 is the moisture conductivity from the upper surface to the lower surface.
  5. 5. The method according to claim 1, wherein the time of the corona treatment is 3 to 10 seconds.
  6. 6. The application of the unidirectional moisture-conducting warm-keeping polylactic acid flocculus prepared by the preparation method of any one of claims 1-5 in preparing outdoor sportswear.

Description

Unidirectional moisture-conducting warm-keeping polylactic acid flocculus, and preparation method and application thereof Technical Field The invention relates to the technical field of functional materials, in particular to a unidirectional moisture-conducting warm-keeping polylactic acid flocculus, and a preparation method and application thereof. Background The wadding refers to a sheet-like cotton (fiber web) for heat preservation or heat insulation, which is made of plant fibers, animal fibers or chemical fibers, and plays an important role in textiles. Moisture permeability is an important factor affecting the comfort of textiles such as clothing, if the human body secretes excessive sweat, the textile can not guide sweat to the outer surface of the textile rapidly and evaporate, so that the human body can not only feel uncomfortable, but also grow bacteria to generate peculiar smell, and the health of the human body is threatened. The unidirectional wet guiding fabric is a functional textile with high added value, and the moisture guiding performance of the front and back surfaces of the fabric has obvious difference, so that sweat can be quickly conducted from the inner layer to the outer layer of the fabric, evaporated as soon as possible, and the sweat of the outer layer cannot flow back to the inner layer. In the prior art, a unidirectional wet-conducting fabric generally adopts a composite layer structure, for example, chinese patent CN110846809A discloses a unidirectional wet-conducting needle-punched composite multi-layer flocculus, which comprises hydrophilic non-woven flocculus layers, water-conducting non-woven flocculus layers and hydrophobic non-woven flocculus layers which are sequentially overlapped and needle-punched through a needle-punching mechanism, namely, firstly, preparing each single-layer flocculus layer, and then, compositing each single-layer flocculus layer. The patent does not clearly describe how to keep warm for the composite multi-layer wadding prepared by the method, but in general, the unidirectional wet guiding and the thermal insulation are not easy to be compatible, and how to prepare the wadding with better unidirectional wet guiding and thermal insulation is a technical problem to be solved in the field at present. Disclosure of Invention The invention aims to provide a unidirectional moisture-conducting warm-keeping polylactic acid flocculus, and a preparation method and application thereof. In order to achieve the above object, the present invention provides the following technical solutions: The invention provides a unidirectional moisture-conducting warm-keeping polylactic acid flocculus, which is obtained by needling a fiber web, wherein the preparation raw material of the fiber web comprises hollow polylactic acid fibers, and the pore size is increased from the upper surface to the lower surface of the unidirectional moisture-conducting warm-keeping polylactic acid flocculus. Preferably, the preparation raw material further comprises non-hollow polylactic acid fibers, and the content of the non-hollow polylactic acid fibers in the preparation raw material is less than or equal to 90wt%. Preferably, the specification of the hollow polylactic acid fiber comprises a fineness of 2.5-7D, a length of 38-105 mm and a hollowness of 15-25%, and the specification of the non-hollow polylactic acid fiber comprises a fineness of 0.8-7D and a length of 38-105 mm. Preferably, the needle punching process further comprises hydrophilic treatment, wherein the hydrophilic treatment acts on the lower surface of the unidirectional moisture-conducting warm-keeping polylactic acid wadding. Preferably, the surface density of the unidirectional moisture-conducting warm-keeping polylactic acid flocculus is 30-350 g/m 2, and the thickness is 3-25 mm; The moisture conductivity change rate of the unidirectional moisture-conducting heat-preserving polylactic acid flocculus is 3-30%, and is calculated according to a formula shown in a formula I: A= (a 1-A2)/A1 x 100% formula I; In the formula I, A is the change rate of the moisture conductivity of the unidirectional moisture-conducting warm-keeping polylactic acid flocculus, A 1 is the moisture conductivity from the lower surface to the upper surface, and A 2 is the moisture conductivity from the upper surface to the lower surface. The invention provides a preparation method of the unidirectional moisture-conducting warm-keeping polylactic acid flocculus, which comprises the following steps: providing a fiber web, wherein the preparation raw materials of the fiber web comprise hollow polylactic acid fibers; The fiber web is needled to obtain unidirectional moisture-conducting thermal-insulation polylactic acid flocculus with pore sizes increasing from the upper surface to the lower surface, the needling comprises needling of an upper needle plate and needling of a lower needle plate, or comprises needling of the upper needle plate, the ne