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CN-122013533-A - Fluorine-free waterproof auxiliary agent for high-density polyester fabric and preparation method thereof

CN122013533ACN 122013533 ACN122013533 ACN 122013533ACN-122013533-A

Abstract

The invention relates to the technical field of polyester fiber products and discloses a fluorine-free waterproof auxiliary agent for high-density polyester fabrics and a preparation method thereof, wherein the fluorine-free waterproof auxiliary agent comprises, by weight, 15-55 parts of long-chain alkyl waterborne polyurethane, 10-20 parts of closed isocyanate crosslinking agent, 1-3 parts of nonionic low-foam penetrating agent, 0.5-1.5 parts of ethylenediamine propyl imidazoline, 1.5-2.2 parts of KH-570 silane coupling agent and 1-3 parts of polyol crosslinking accelerator, wherein the long-chain alkyl waterborne polyurethane is waterborne polyurethane resin introduced with C12-C18 long-chain alkyl for hydrophobic modification. The fluorine-free waterproof auxiliary agent can form a tightly combined waterproof film on the fabric, and combines the waterproof performance and durability.

Inventors

  • CAI CHAOHUI
  • ZHAO HONGHUI

Assignees

  • 诸暨市新丝维纤维有限公司

Dates

Publication Date
20260512
Application Date
20260302

Claims (10)

  1. 1. The fluorine-free waterproof auxiliary agent for the high-density polyester fabric is characterized by comprising, by weight, 15-55 parts of long-chain alkyl waterborne polyurethane, 10-20 parts of a closed isocyanate crosslinking agent, 1-3 parts of a nonionic low-foam penetrating agent, 0.5-1.5 parts of ethylenediamine propyl imidazoline, 1.5-2.2 parts of KH-570 silane coupling agent and 1-3 parts of a polyol crosslinking accelerator, wherein the long-chain alkyl waterborne polyurethane is waterborne polyurethane resin introduced with C12-C18 long-chain alkyl for hydrophobic modification.
  2. 2. The fluorine-free waterproof auxiliary agent for the high-density polyester fabric according to claim 1, which is characterized by further comprising 2-3 parts by weight of KH-550 silane coupling agent.
  3. 3. The fluorine-free waterproof auxiliary agent for the high-density polyester fabric according to claim 1, which is characterized by further comprising 4-5 parts by weight of a nonionic softener.
  4. 4. The fluorine-free waterproof auxiliary agent for high-density polyester fabrics according to claim 1, which is characterized by further comprising 0.5-1.5 parts by weight of an acid regulator.
  5. 5. The fluorine-free waterproof auxiliary agent for high-density polyester fabrics according to claim 1, wherein the polyol crosslinking accelerator is glycerol polyoxyethylene ether, and the nonionic low-foam penetrating agent is isomeric alcohol polyoxyethylene ether.
  6. 6. The fluorine-free waterproof auxiliary agent for high-density polyester fabrics according to any one of claims 1 to 5, wherein the mass ratio of the long-chain alkyl waterborne polyurethane to the ethylenediamine propyl imidazoline is (30-35): 1.
  7. 7. The preparation method of the fluorine-free waterproof auxiliary agent for the high-density polyester fabric is characterized by comprising the following steps of: S1, adding ethylenediamine propyl imidazoline into an acidic aqueous solution, mixing to obtain an activation solution, adding long-chain alkyl aqueous polyurethane into the activation solution, and performing an activation reaction to obtain an activated modified waterproof agent solution; s2, adding KH-570 silane coupling agent solution into the activated modified waterproof agent solution, mixing, adding nonionic low-foam penetrating agent, polyol crosslinking accelerator, KH-550 silane coupling agent and nonionic softener, and mixing to obtain composite modified liquid; And S3, adding a closed isocyanate cross-linking agent into the composite modified liquid, and mixing to obtain the fluorine-free waterproof auxiliary agent working liquid.
  8. 8. The preparation method of the fluorine-free waterproof auxiliary agent for the high-density polyester fabric, which is characterized in that in the step S1, the preparation process of the acidic aqueous solution is that an acidic regulator is added into the aqueous solution, and the pH value of the system is regulated to 5.5-6.5.
  9. 9. The method for preparing the fluorine-free waterproof auxiliary agent for the high-density polyester fabric according to claim 7, wherein in the step S1, the reaction temperature of the activation reaction is 20-30 ℃, and the reaction time is 15-30 min.
  10. 10. The preparation method of the fluorine-free waterproof auxiliary agent for the high-density polyester fabric, which is characterized in that in the step S3, the KH-570 silane coupling agent solution is formed by diluting KH-570 silane coupling agent and water according to the mass ratio of 1 (4-6).

Description

Fluorine-free waterproof auxiliary agent for high-density polyester fabric and preparation method thereof Technical Field The invention relates to the technical field of polyester fiber products, in particular to a fluorine-free waterproof auxiliary agent for high-density polyester fabrics and a preparation method thereof. Background The high-density polyester fabric has the characteristics of high strength, wear resistance, light weight, easy molding and the like, and is widely applied to the fields of clothing, bags, tents, down jackets and the like. The application scene has high requirements on the waterproof performance and the water resistance of the fabric. The traditional polyester fabric waterproof finishing mostly adopts a fluorine-based waterproof agent, and realizes excellent waterproof effect by relying on the low surface energy of a fluorocarbon chain, but perfluoro and polyfluoroalkyl substances (PFAS) contained in the fluorine-based waterproof agent have environmental durability and bioaccumulation, and are proved to have health risks such as hepatotoxicity, reproductive toxicity and the like, and are listed in an eliminating list of Stockholm convention about persistent organic pollutants, the EU REACH rule also strictly prohibits the implementation of the technology, china also prohibits the production and use of the PFAS except specific exemptions, and the application of the fluorine-based waterproof agent is comprehensively limited, so that the development of a fluorine-free environment-friendly waterproof finishing system becomes the development trend of the industry. Various fluorine-free waterproof auxiliary agents such as long-chain alkyl, polyurethane and polyolefin can meet the basic fluorine-free environment-friendly requirement in the prior art, but the fluorine-free waterproof auxiliary agents are easy to float and adhere to the surface of the fabric due to compact fiber arrangement and low surface polarity of the high-density polyester fabric, and the formed waterproof film is only in physical adsorption combination, so that the waterproof performance and durability are difficult to be combined. Disclosure of Invention In order to solve the technical problems, the invention provides a fluorine-free waterproof auxiliary agent for high-density polyester fabrics, which can form a tightly combined waterproof film on the fabrics and combines waterproof performance and durability. The fluorine-free waterproof auxiliary agent for the high-density polyester fabric comprises, by weight, 15-55 parts of long-chain alkyl waterborne polyurethane, 10-20 parts of closed isocyanate crosslinking agent, 1-3 parts of nonionic low-foam penetrating agent, 0.5-1.5 parts of ethylenediamine propyl imidazoline, 1.5-2.2 parts of KH-570 silane coupling agent and 1-3 parts of polyol crosslinking accelerator, wherein the long-chain alkyl waterborne polyurethane is waterborne polyurethane resin introduced with C12-C18 long-chain alkyl for hydrophobic modification. The action mechanism of the fluorine-free waterproof auxiliary agent is that KH-570 silane coupling agent can hydrolyze to generate silicon hydroxyl, and the silicon hydroxyl and hydroxyl on the surface of polyester fiber are dehydrated and condensed to form chemical anchoring on the surface of the fiber and realize surface activation, so that the interfacial compatibility and the reactivity of the fiber and the subsequent resin are improved. The imidazoline ring and active amino in ethylenediamine propyl imidazoline can have a bonding effect with hydroxyl and amino on long-chain alkyl waterborne polyurethane molecules, on one hand, the novel active site of the imidazoline ring is introduced on the polyurethane molecular chain to improve the reaction capacity of the polyurethane molecular chain, and on the other hand, the original active group of the polyurethane is activated, so that a single polyurethane molecule can be combined with a plurality of cross-linking agents and fiber surface activation sites at the same time, and the utilization rate and bonding density of effective attachment sites are remarkably improved. On the basis, the-NCO groups released after the blocked isocyanate crosslinking agent is subjected to thermal deblocking can be subjected to crosslinking reaction with fiber activation sites, polyurethane molecules and polyol crosslinking accelerators, the polyol crosslinking accelerators further improve crosslinking density through a polyhydroxy structure to enable a system to form a more compact and stable crosslinking network, and the nonionic low-foam penetrating agent can reduce the surface tension of the system and rapidly penetrate fiber gaps of high-density polyester fabrics so that the activator, the waterproof agent and the crosslinking agent uniformly penetrate into fiber inner layers to realize synchronous activation and interface bonding of inner-layer fibers. Finally, under the synergistic effect of the components, t