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CN-118721875-B - Composite flash evaporation non-woven fabric and preparation method thereof

CN118721875BCN 118721875 BCN118721875 BCN 118721875BCN-118721875-B

Abstract

The application discloses a composite flash evaporation non-woven fabric and a preparation method thereof, and belongs to the technical field of high polymer materials. According to the method, a PBAT material with specific composition is formed into a film in advance, and a sandwich structure product of the PBAT layer, the flash evaporation non-woven fabric layer and the PBAT layer is constructed, and the product with the composite structure has the mechanical strength of the flash evaporation non-woven fabric, the biocompatibility and the antibacterial property of the PBAT material, and then the product is enabled to generate surface textures with simulation effects through the graining treatment, so that the product is high in fashion sense and is very suitable for the clothing field.

Inventors

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Assignees

  • 厦门当盛新材料有限公司

Dates

Publication Date
20260508
Application Date
20240605

Claims (9)

  1. 1. The preparation method of the composite flash evaporation non-woven fabric is characterized by comprising the following steps of: preparing a PBAT composite resin, and then blowing a film to obtain a first PBAT film layer and a second PBAT film layer, wherein the PBAT composite resin comprises PBAT resin, polylactic acid, inorganic filler and organic filler, the organic filler is sodium alginate crosslinked starch master batch, the average particle size of the organic filler is less than or equal to 3 mu m, and the mass content of the organic filler in the PBAT composite resin is less than or equal to 5wt%; Covering the first PBAT film layer and the second PBAT film layer on two sides of the flash evaporation non-woven fabric respectively, exhausting air, and performing hot rolling edge sealing treatment to obtain composite base cloth; Arranging the composite substrate into water for wetting, then placing the composite substrate into a twisting machine with a heating system for forward and reverse rotation and overturning, and performing first twisting treatment, wherein the rotating speed of a roller of the twisting machine is more than or equal to 500r/min and less than or equal to 800r/min during the first twisting treatment, the temperature is more than or equal to 30 ℃ and less than or equal to 40 ℃ and the time is more than or equal to 10min and less than or equal to 15min; Soaking the composite base cloth subjected to the first rubbing treatment in water at 0-5 ℃ for 5-10 min, and then putting the composite base cloth into a rubbing machine again for second rubbing treatment, wherein the rotating speed of a roller of the rubbing machine is greater than or equal to 900r/min and less than or equal to 1300r/min during the second rubbing treatment, the temperature is greater than or equal to 75 ℃ and less than or equal to 85 ℃ and the time is greater than or equal to 2min and less than or equal to 4min; And cooling and drying the composite base cloth subjected to the second graining treatment to obtain the composite flash evaporation non-woven fabric.
  2. 2. The method for producing a composite flash nonwoven fabric according to claim 1, wherein the heating system of the texturing machine heats at a temperature of 5 ℃ per minute or more.
  3. 3. The method for preparing the composite flash evaporation non-woven fabric according to claim 1, wherein the PBAT composite resin comprises the following components in parts by weight: 80-85 parts of PBAT resin, 5-10 parts of polylactic acid, 6-9 parts of inorganic filler and 1-4 parts of organic filler.
  4. 4. The method for preparing the composite flash evaporation non-woven fabric as claimed in claim 1, wherein the method for preparing the sodium alginate crosslinked starch master batch comprises the following steps, Mixing starch and sodium alginate in water, then adjusting the pH of the obtained mixed solution to 9-10, adding a cross-linking agent for cross-linking reaction, adjusting the pH of the obtained mixed solution to 6.5-7.5 after the reaction is finished, carrying out solid-liquid separation, and drying to obtain sodium alginate cross-linked starch; And mixing and stirring the sodium alginate crosslinked starch and the auxiliary agent, extruding and granulating by adopting a double-screw extruder, and sieving to obtain the sodium alginate crosslinked starch master batch.
  5. 5. The method for preparing a composite flash evaporation non-woven fabric as claimed in claim 4, wherein the mass ratio of the starch to the sodium alginate is 1 (0.1-0.2).
  6. 6. The method for producing a composite flash evaporation nonwoven fabric according to claim 1, wherein the ratio of the thicknesses of the first PBAT film layer, the flash evaporation nonwoven fabric and the second PBAT film layer in the composite base fabric is (0.8-1.2) 3 (0.8-1.2).
  7. 7. The composite flash nonwoven fabric prepared by the preparation method of the composite flash nonwoven fabric according to any one of claims 1 to 6.
  8. 8. The composite flash-spun nonwoven fabric of claim 7, wherein the composite flash-spun nonwoven fabric has a tensile strength of 6 kN/m or greater and 7kN/m or less, as measured according to GB/T12914-2018.
  9. 9. The composite flash nonwoven fabric of claim 7, wherein the composite flash nonwoven fabric has an elongation at break according to GB/T12914-2018 test of 25% or more and 30% or less.

Description

Composite flash evaporation non-woven fabric and preparation method thereof Technical Field The application relates to the technical field of high polymer materials, in particular to a composite flash evaporation non-woven fabric and a preparation method thereof. Background The flash evaporation non-woven fabric is a product prepared by instantly releasing polymer raw materials (mainly polyethylene) in high-temperature and high-pressure environment to normal temperature and normal pressure so as to form a film of spindle fibers, and has higher strength and lighter weight compared with the traditional synthetic non-woven fabric. However, compared with the traditional non-woven fabric material, the flash non-woven fabric has hard texture and low simulation degree, and based on the characteristics of polyethylene, people are not willing to directly contact with polyethylene plastic products for a long time, so that the flash non-woven fabric is applied to fewer products in the clothing field at present. Biodegradable polyesters such as PBAT (polybutylene adipate terephthalate) are often used in the field of food and medicine packaging, mainly because of good processability, high biocompatibility and degradability, safety and environmental protection, and PLA (polylactic acid) is also compounded in the materials, which is a natural antibacterial mildew inhibitor and can inhibit bacterial mold growth on products in some humid environments, and is theoretically very suitable for the clothing field, however, the mechanical properties of the biodegradable polyesters are generally not as good as those of non-biodegradable plastics such as polypropylene and polyethylene, and are very easily damaged. Disclosure of Invention Based on the defects existing in the prior art, the application aims to provide a preparation method of a composite flash evaporation non-woven fabric, which forms a film by a PBAT material with specific composition in advance and constructs a sandwich structure product of a PBAT layer-a flash evaporation non-woven fabric layer-a PBAT layer. In order to achieve the above purpose, the application adopts the following technical scheme: The preparation method of the composite flash evaporation non-woven fabric comprises the following steps: Preparing a PBAT composite resin, then blowing a film to obtain a first PBAT film layer and a second PBAT film layer, wherein the PBAT composite resin comprises PBAT resin, polylactic acid, inorganic filler and organic filler, the organic filler is sodium alginate crosslinked starch master batch, the average particle size of the organic filler is less than or equal to 3 mu m, the mass content of the organic filler in the PBAT composite resin is less than or equal to 5wt%, The first PBAT film layer and the second PBAT film layer are respectively covered on the two sides of the flash evaporation non-woven fabric, air suction is carried out, hot rolling edge sealing treatment is carried out, thus obtaining the composite base fabric, Placing the composite substrate into water for wetting, then placing the composite substrate into a twisting machine with a heating system for forward and reverse rotation and overturning, performing first twisting treatment, wherein the rotating speed of a roller of the twisting machine is 500-800 r/min, the temperature is 30-40 ℃ and the time is 10-15 min during the first twisting treatment, Soaking the composite base cloth subjected to the first rubbing treatment in water at 0-5 ℃ for 5-10min, then putting the composite base cloth into a rubbing machine again for second rubbing treatment, wherein the rotating speed of a roller of the rubbing machine is 900-1300 r/min, the temperature is 75-85 ℃ and the time is 2-4 min during the second rubbing treatment, And cooling and drying the composite base cloth subjected to the second graining treatment to obtain the composite flash evaporation non-woven fabric. Preferably, the flash nonwoven fabric is a polyethylene flash nonwoven fabric. Preferably, the average particle size of the organic filler is 1 to 3 μm. The flash evaporation non-woven fabric, especially the polyethylene flash evaporation non-woven fabric, has high mechanical strength, good barrier property and lighter gram weight due to the special preparation process and the three-dimensional fiber composite structure, and has great advantages when applied to the clothing field, but the flash evaporation non-woven fabric is dry, hard and uncomfortable in texture and smooth in surface, and has no fashion sense when applied to the clothing field. In order to form some leather-like texture effects on the surface of the existing non-woven fabric material to enhance fashion sense, the material is subjected to texture rubbing treatment, and the texture of the material is fluffy to a certain extent by the texture rubbing treatment, so that the touch sense is improved. However, for flash evaporation non-woven fabrics, based on the characteristi