CN-122003478-A - Preparation method of lightweight melt-blown hot-melt non-woven fabric containing hydrophobic nano silicon dioxide

Abstract

The lightweight meltblown hot melt nonwoven fabric containing hydrophobic nanosilicon dioxide prepared by the preparation method of the present invention has the effect of ensuring uniformity of adhesive force per section, excellent peel strength and good air permeability even when a smaller amount of adhesive resin is used than in the conventional hot melt film, and reducing material cost and energy by about 10 to 50%, in the case of performing an adhesive function by being interposed between adherends such as fabric, whereby a fabric product to which the meltblown hot melt nonwoven fabric is applied has the feature of preventing overflow (overflow) phenomenon in an adhesive process, and realizing lightweight and soft touch feeling.

Inventors

• Pu Xida

Assignees

• 三扶精密化学株式会社
• 朴喜大

Dates

Publication Date

20260508

Application Date

20250109

Priority Date

20240906

Claims (7)

1. 1. A method for producing a lightweight melt-blown hot-melt nonwoven fabric containing hydrophobic nanosilica, which comprises producing a hot-melt nonwoven fabric from at least one binder resin selected from Thermoplastic Polyurethane (TPU) and ethylene-vinyl acetate (EVA), wherein the binder resin contains hydrophobic nanosilica having a particle size of 1 to 100nm in a range of 0.1 to 5phr (per hundred parts of resin content (Parts per Hundred Resin)), characterized by comprising the steps of: A first step of forming the fiber melt-spun through a spinning nozzle into a melt-blown nonwoven fabric web after extruding the binder resin in an extruder; and a second step of trimming and winding the melt-blown nonwoven web.
2. 2. The method for producing a lightweight meltblown hot melt nonwoven fabric containing hydrophobic nanosilica according to claim 1, The fibers forming the meltblown nonwoven web (web) have an average diameter of 1 to 30 μm.
3. 3. The method for producing a lightweight meltblown hot melt nonwoven fabric containing hydrophobic nanosilica according to claim 1, The gram weight of the hot melt non-woven fabric is formed within the range of 10-300 g/m 2 .
4. 4. The method for producing a lightweight meltblown hot melt nonwoven fabric containing hydrophobic nanosilica according to claim 1, The hydrophobic nano silicon dioxide contains more than one hydrophobic functional group selected from alkyl, dimethyl, trimethyl, dimethylsiloxane and methacrylic acid groups on the surface of the particles.
5. 5. The method for producing a lightweight meltblown hot melt nonwoven fabric containing hydrophobic nanosilicon dioxide of claim 4, The hydrophobic nano-silica forms nano-silica aggregates (aggregates) and has an aggregate size within an average of 100-1200 nm.
6. 6. The method for producing a lightweight meltblown hot melt nonwoven fabric containing hydrophobic nanosilica according to claim 1, The Thermoplastic Polyurethane (TPU) binder resin comprises a biomass-based thermoplastic polyurethane resin in the range of 20-70 wt%, wherein the biomass-based thermoplastic polyurethane resin is prepared by reacting a biomass-derived polyol with a glycol Chain extender (Chain extender) and a diisocyanate (Diisocyanate).
7. 7. A lightweight meltblown hot melt nonwoven fabric containing hydrophobic nanosilica prepared according to the method of any one of claims 1 to 6.

Description

Preparation method of lightweight melt-blown hot-melt non-woven fabric containing hydrophobic nano silicon dioxide Technical Field The present invention relates to a method for producing a lightweight meltblown (Melt blown) hot melt nonwoven fabric containing hydrophobic nano silica (nano silica), and more particularly, to a method for producing a lightweight meltblown hot melt nonwoven fabric containing hydrophobic nano silica, which can reduce material costs and energy while ensuring uniform adhesion and excellent peel strength and good air permeability even when using a smaller amount of binder resin than conventional hot melt adhesive films by using a hot melt nonwoven fabric produced by a melt blowing method when bonding by inserting a binder resin between fabrics of clothing, shoes, bags, etc. Background Recently, in addition to industries such as shoes, clothes, and bags, there have been attempts to reduce or eliminate the sewing process requiring a large amount of labor in the production process as a part of efforts for reducing production costs and improving quality in all industrial fields requiring the bonding process. Accordingly, the present invention aims to increase the throughput per unit of time and reduce the cost by replacing the sewing process, which occupies a considerable part of the production cost, with the bonding process. In such a bonding step, an adhesive in a liquid state is applied to an adherend such as a facing material, and then the facing materials are bonded to each other in a state where a solvent or moisture is volatilized by drying. This has advantages over the sewing process in that the process time and the operator can be reduced, but in order to minimize the cost, a process of using a film-form hot melt adhesive (hereinafter referred to as a hot melt film) instead of using a liquid adhesive and bonding the fabric by hot pressing is often applied. The hot melt film is used for the purposes of environmental protection, convenience, cost reduction and the like in the industrial fields of shoes, clothes, bags and the like, and can be prepared from thermoplastic resins of various materials such as thermoplastic polyurethane (TPU: thermoplastic polyurethane), polyamide (Polyamide), ethylene-vinyl acetate copolymer (EVA: ETHYLENE VINYL ACETATE), polyester (Polyester) and the like. However, in order to ensure stable adhesion, the conventional hot-melt film is generally manufactured with a thickness of 0.2mm or more, and therefore, if the hot-melt film is put between fabrics and subjected to hot-pressing work (No-Sew Press), an overflow phenomenon frequently occurs, and not only the fabric product becomes heavy as a whole but also the hand becomes hard, and there is a disadvantage that it is not possible to cope with the development trend (trend) of gradually becoming light. Such conventional hot melt films have a problem that the thickness of the film is not less than 0.2mm, but also have a problem that if a hot press operation is performed in a state where a thermoplastic hot melt film is interposed between the facing materials, the amount of the hot melt film flows into the facing material side having a large diameter of the hole (hole) so much that the hot melt film does not exist at the adhesive interface, and finally, poor adhesion occurs. That is, in the case of bonding different kinds of facings such as a large-sized facing of a facing textile hole (hole) and a small facing or a high-density facing of a wire (yarn) organization of the facing and a low facing with each other using a thermoplastic hot-melt film, the hot-melt film is excessively biased to one side of the facing due to heat and pressure, which is to melt the hot-melt film to the large-sized facing side or the low-density side of the wire organization, so that the hot-melt film does not remain at the remaining bonding interface of the facing. In order to solve the above-described problems, the present inventors studied on thermoplastic polyurethane hot melt films prepared by the T-die extrusion process and the preparation method thereof in korean laid-open patent nos. 10-2014-0147631 and 10-2015-0005092, and found the fact that, by using a thermoplastic hot melt film for shoes formed by incorporating 0.1 to 5.0phr of nano silica in a resin composition selected from any one of Thermoplastic Polyurethane (TPU), ethylene-vinyl acetate (EVA), polyamide (Polyamide), and Polyester (Polyester), even in the case where the wire (yarn) tissue density of the face fabric is high or the density is low or the diameter of the face fabric textile holes (hole) is large or small, the hot melt film is not melted and flowed in by heat and pressure, and it can be uniformly distributed on the face fabric surface, so that the adhesive force of the hot melt film can be increased. In addition, in patent nos. 10-2057036 and 10-2440469, the nano silica used in the above-mentioned patent is blended with the surface-modified hydrophob