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CN-122013546-A - Multifunctional bio-based polylactic acid fabric and preparation method thereof

CN122013546ACN 122013546 ACN122013546 ACN 122013546ACN-122013546-A

Abstract

The invention relates to a multifunctional bio-based polylactic acid fabric and a preparation method thereof, and belongs to the technical field of polylactic acid fabrics. The preparation method comprises the following steps of S1, adding polylactic acid, a pore-forming agent and nano negative ion powder into an organic solvent, stirring at 1200-1800 rpm for 0.5-1.5 h at 90-110 ℃ and then cooling to 65-75 ℃ to obtain a precursor solution, S2, coating the precursor solution on the surface of the polylactic acid fabric, sequentially immersing the polylactic acid fabric coated with the precursor solution into a hot water bath and a cold water bath in a reverse buckling manner for phase separation, and drying to obtain the composite polylactic acid fabric, and S3, sequentially immersing the composite polylactic acid fabric into an acid liquor and an alkali liquor for soaking treatment, and drying to obtain the multifunctional bio-based polylactic acid fabric. The synergistic effect of temperature reduction and negative ion release is realized by the synergistic design of the nano negative ion powder introduction and the acid-base regulation porous structure.

Inventors

  • SHEN JICHENG
  • JI HUQUAN
  • SHEN LI

Assignees

  • 海泰纺织（苏州）有限公司

Dates

Publication Date
20260512
Application Date
20260211

Claims (10)

  1. 1. The preparation method of the multifunctional bio-based polylactic acid fabric is characterized by comprising the following steps of: S1, adding polylactic acid, a pore-forming agent and nano negative ion powder into an organic solvent, stirring at 1200rpm-1800rpm for 0.5h-1.5h at 90-110 ℃, and then cooling to 65-75 ℃ to obtain a precursor solution; s2, coating the precursor solution in the S1 on the surface of the polylactic acid fabric, sequentially immersing the polylactic acid fabric coated with the precursor solution in a hot water bath at 70-90 ℃ for 30S-50S and a cold water bath at 15-30 ℃ for 0.5h-1.5h in an inverted manner to perform phase separation, and drying to obtain the composite polylactic acid fabric; S3, sequentially immersing the composite polylactic acid fabric in acid liquor and alkali liquor for soaking treatment for 25-35 min, and drying to obtain the multifunctional bio-based polylactic acid fabric.
  2. 2. The method for preparing the multifunctional bio-based polylactic acid fabric according to claim 1, wherein in S1, the molecular weight of the polylactic acid is 10 ten thousand to 30 ten thousand; and/or the porogen is selected from polyethylene glycol and/or polyvinylpyrrolidone.
  3. 3. The method for preparing a multifunctional bio-based polylactic acid fabric according to claim 1, wherein in S1, the nano negative ion powder comprises lanthanum oxide, cerium oxide, zinc oxide and titanium dioxide; and/or the particle size of the nano negative ion powder is 0.1-5 μm.
  4. 4. The method for preparing a multifunctional bio-based polylactic acid fabric according to claim 1, wherein in S1, the organic solvent is selected from one or more of N, N-dimethylacetamide, N-dimethylformamide, N-methylpyrrolidone and dimethylsulfoxide.
  5. 5. The preparation method of the multifunctional bio-based polylactic acid fabric according to claim 1, wherein in S1, the mass ratio of the polylactic acid to the pore-forming agent to the nano negative ion powder is 10 (11-13.5) (2.8-3.2); and/or the concentration of the polylactic acid in the precursor solution is 480mg/mL-520mg/mL.
  6. 6. The method for producing a multifunctional bio-based polylactic acid fabric according to claim 1, wherein in S2, the coating amount of the precursor solution is 10g/m 2 -50g/m 2 .
  7. 7. The method for preparing a multifunctional bio-based polylactic acid fabric according to claim 1, wherein in S2, the drying mode is air drying or drying.
  8. 8. The method for preparing the multifunctional bio-based polylactic acid fabric according to claim 1, wherein the drying is performed at 50-70 ℃ for 2-6 hours.
  9. 9. The method for preparing the multifunctional biobased polylactic acid fabric according to claim 1, wherein in the step S2, the acid liquor is a hydrochloric acid solution of 0.4mol/L to 0.6 mol/L; And/or the alkali liquor is 0.4mol/L-0.6mol/L sodium hydroxide solution.
  10. 10. The multifunctional biobased polylactic acid fabric prepared by the method of any one of claims 1-9.

Description

Multifunctional bio-based polylactic acid fabric and preparation method thereof Technical Field The invention belongs to the technical field of polylactic acid fabrics, and particularly relates to a multifunctional bio-based polylactic acid fabric and a preparation method thereof. Background Under the background that the global energy crisis and the ecological environment problem are increasingly prominent, the passive radiation cooling technology becomes a research hot spot in the fields of building energy conservation, outdoor human-living environment regulation and control and the like by virtue of the core advantages of no additional energy input and green energy conservation. According to the technology, high-efficiency reflection of sunlight and directional radiation and heat dissipation of a middle infrared band are realized through optical property regulation and control of the material, so that an autonomous cooling effect is achieved, and deep and diversified exploration is carried out in the field of a plurality of carriers such as textiles. Currently, a core technical path for realizing efficient daytime radiation refrigeration is mainly focused on the design of precise material screening and refined structure, and the solar reflectance and the mid-infrared heat emissivity of the material are cooperatively improved. For example, patent CN114481636A discloses a textile coating with radiation refrigeration function and a preparation method thereof, a porous coating is constructed on the surface of a textile substrate by adopting water-based acrylic resin and specific reflective pigment filler through a one-step coating process, so that the coating obtains high reflectivity of more than or equal to 85% and high emissivity of more than or equal to 85%, patent CN112126287A discloses a gel-type radiation cooling coating, a preparation method and application thereof, a gel-type coating system is constructed by taking water-based polymer as a matrix, and a unique hydrogel structure has self-cleaning regeneration capability after pollution, can maintain high solar reflectance for a long time, and ensures stability of cooling performance. Meanwhile, along with popularization of healthy people's living concepts, functional requirements such as air purification gradually become an important direction of material research and development. For example, patent CN112044295A discloses a nano tourmaline dispersion liquid and a preparation method thereof, and the nano tourmaline dispersion liquid with excellent storage stability is prepared through processes such as homogeneous mixing, so as to lay a technological foundation for introducing a negative oxygen ion releasing functional unit into a carrier such as a coating, a textile and the like to realize the air purification function of the material. Although the prior art has made a certain progress in the field of radiation cooling or single function modification, in the practical application scene, the obvious technical defects and performance bottlenecks still exist, and the technical defects are particularly expressed in the following aspects of prominent function singleness and poor synergistic performance. Most radiation cooling materials are only focused on the core function of temperature regulation, cannot be effectively fused with requirements such as air purification, and are difficult to meet diversified use requirements in complex scenes. The existing material with the negative oxygen ion release function is generally low in ion release efficiency in a static environment, and cannot fully utilize the remarkable temperature gradient and thermal stress generated in the radiation cooling process, so that the negative oxygen ion release capacity is enhanced through the thermoelectric effect and the piezoelectric effect of active excitation functional particles, and the innovative design for realizing the cooperative gain of the cooling and air purification functions is lacking. Secondly, structural design is unreasonable, and performance improvement is limited. The connectivity and specific surface area of the internal pore structure of the functional coating prepared by the conventional non-solvent induced phase separation process often do not reach the optimal design standard, so that the physical properties such as mechanical strength of the material are weaker, the internal functional particles are prevented from being fully contacted with air, and the efficient exertion of the composite function is severely limited. Third, the green environmental protection performance is not good enough. The existing radiation cooling coating mostly adopts the traditional preparation process and raw material system, and part of components have the problems of poor environmental compatibility, release of volatile harmful substances and the like, which are contrary to the current development concept of green low carbon, and are difficult to meet the application requi