Three-dimensional flexible composite foam material with concave-convex structure core and gradient surface and its preparation method

Abstract

The invention discloses a three-dimensional flexible composite foam material with a concave-convex structure core and a gradient surface and a preparation method thereof. The preparation method includes the following steps: preparing a plurality of identical rectangular parallelepiped warp-knitted spacer fabrics, and preparing two identical PET nonwoven fabrics. cloth, a plurality of cuboid warp-knitted spacers are arranged on the first PET non-woven fabric along the rectangular array direction, and the second PET non-woven fabric is covered on a plurality of cuboid warp-knitted spacers to obtain a sandwich structure; the sandwich structure is placed on Keep at 170~190°C for 10~30min to obtain a three-dimensional structure. Pour the foaming liquid into the foaming mold. Put the three-dimensional structure with a concave-convex structure and a PET nonwoven fabric with a flat structure on the foaming liquid respectively. After solidification and demoulding, a three-dimensional flexible composite foam material is formed. The invention combines the textile material and the toughening material, and prepares the three-dimensional flexible composite foaming material with a concave-convex structure core and a gradient surface through a secondary foaming process, thereby enhancing the mechanical properties of the three-dimensional flexible composite foaming material.

Description

technical field [0001] The invention belongs to the technical field of functional materials, and specifically relates to a three-dimensional flexible composite foam material with a concave-convex structure core and a gradient surface and a preparation method thereof. Background technique [0002] At present, the mechanical properties of polyurethane foam materials are poor, and the applicant tries to improve the mechanical properties of polyurethane foam by adding nanoparticles (graphene, carbon nanotubes, silicon dioxide, etc.). However, the hydrophilic and hydrophobic properties of additives and the added concentration have a great influence on the cell structure of polyurethane foam, and the additive nucleation effect is obvious and the distribution is uneven, so that it will destroy the cell shape; fabric is added to polyurethane foam as a reinforcing material, although it can Increases the impact strength of the material, but generally reduces the flexural and tensile s...

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Problems solved by technology

[0002] At present, the mechanical properties of polyurethane foam materials are poor, and the applicant tries to improve the mechanical properties of polyurethane foam by adding nanoparticles (graphene, carbon nanotubes, silica, etc.)

However, the hydrophilic and hydrophobic properties of additives and the added concentration have a great influence on the cell structure of polyurethane foam, and the additive nucleation effect is obvious and the distribution is uneven, so that it will destroy the cell shape; fabric is added to polyurethane foam as a reinforcing material, although it can Increases the impact strength of the material, but generally reduces the flexural and tensile strength of the composite

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