A kind of ultrafine fiber waterborne polyurethane foamed synthetic leather

Abstract

The invention discloses a superfine fiber water-based polyurethane foamed synthetic leather, comprising a base fabric and a foamed water-based polyurethane layer; the base fabric is a double-layer structure with a surface layer and an inner layer, the surface layer is a nap layer, and the inner layer is a lattice layer; the base fabric comprises a surface weft, an inner weft, a surface warp and an inner warp; the surface weft, the inner weft, the surface warp and the inner warp are all superfine fiber yarns; the surface weft and the surface warp are interwoven into the surface layer of the base fabric using a surface tissue, and the inner weft and the inner warp are interwoven into the inner layer of the base fabric using an inner tissue; the surface tissue is a satin texture with five three-fly wefts, and the inner tissue is a plain weave; the surface layer and the inner layer are connected by nodes formed by interweaving the surface warp and the inner weft, and nodes formed by interweaving the inner warp and the surface weft; the lattice layer of the base fabric has pores for water-based polyurethane to enter the base fabric, and the foamed water-based polyurethane layer is filled between the surface layer and the inner layer of the base fabric. The superfine fiber water-based polyurethane foamed synthetic leather has a good sense of thickness, a soft and delicate hand feel, a good surface smoothness and a good air permeability and water absorption.

Description

Technical Field

[0001] The invention relates to the technical field of synthetic leather, in particular to a superfine fiber waterborne polyurethane foamed synthetic leather. Background Art

[0002] At present, most of the domestic polyurethane synthetic leathers are produced using oily organic solvent-based polyurethane resins, which are made using dimethylformamide (DMF) as the main solvent. DMF can cause serious harm to the human body and the environment. It can damage human health through breathing and skin contact, irritate and damage the eyes, and long-term contact or inhalation by the human body can hinder hematopoietic function and cause liver disorders. In addition, DMF in water will increase BOD and nitrogen content, rapidly deteriorate water quality, and is extremely difficult to biodegrade.

[0003] Although DMF recovery technology can recover most of the solvents in the production process, there is still a small part of the solvent that cannot be recovered and will be discharged into the surrounding environment through water and air, causing pollution; moreover, the process flow and various devices of DMF recovery also increase energy consumption.

[0004] At present, the country is vigorously promoting the use of water-based polyurethane resin to replace DMF solvents, thereby reducing DMF emissions. Water-based polyurethane uses water instead of organic solvents as a dispersion medium. From a production perspective, it eliminates the need for recycling processes, is beneficial to energy conservation and environmental protection, and also makes the production process safer.

[0005] The existing water-based polyurethane synthetic leather is generally made of non-woven fabric as the base fabric, which is not soft and delicate enough and has poor surface smoothness. Since water evaporation is a slow process, the polyurethane molecules of the water-based polyurethane resin synthetic leather will be close to each other during the drying process, resulting in poor impregnation effect and insufficient thickness of the synthetic leather product. In addition, in the current water-based impregnation process, the length of the impregnation tank is only 0.5m, the time for the base fabric to pass through the impregnation tank is short, and the existing process generally uses a base fabric with a tight structure, so it is difficult for the polyurethane resin to completely impregnate the base fabric, resulting in poor impregnation effect. Summary of the invention

[0006] In order to solve the above technical problems, the purpose of the present invention is to provide a superfine fiber water-based polyurethane foamed synthetic leather, which is made of water-based polyurethane, is beneficial to environmental protection, and has a good sense of thickness, a softer and more delicate feel, a better surface smoothness and better air permeability and water absorption.

[0007] In order to achieve the above technical objectives and the above technical effects, the present invention is implemented through the following technical solutions:

[0008] A superfine fiber water-based polyurethane foamed synthetic leather comprises a base fabric and a foamed water-based polyurethane layer; the base fabric is a double-layer structure with a surface layer and an inner layer, the surface layer is a nap layer, and the inner layer is a lattice layer; the base fabric comprises a surface weft, an inner weft, a surface warp and an inner warp; the surface weft, the inner weft, the surface warp and the inner warp are all superfine fiber yarns; the surface weft and the surface warp are interwoven into the surface layer of the base fabric using a surface tissue, and the inner weft and the inner warp are interwoven into the inner layer of the base fabric using an inner tissue; the surface tissue is a satin texture with five three-fly wefts, and the inner tissue is a plain weave; the surface layer and the inner layer are connected through nodes formed by interweaving the surface warp and the inner weft and nodes formed by interweaving the inner warp and the surface weft; the lattice layer of the base fabric has pores for water-based polyurethane to enter the base fabric, and the foamed water-based polyurethane layer is filled between the surface layer and the inner layer of the base fabric.

[0009] Furthermore, a complete cycle organization unit of the base fabric includes 200 surface wefts, 20 inner wefts, 200 surface warps and 20 inner warps, and the complete cycle organization unit is formed by the circulation of small cycle organization units, each small cycle organization unit includes 20 surface warps, 2 inner warps, 20 surface wefts and 2 inner wefts.

[0010] Furthermore, the surface warp is 75D polyester DTY yarn, the surface weft is 260D sea island yarn, the lining warp is 160D polyester-nylon composite yarn, and the lining weft is 160D polyester-nylon composite yarn.

[0011] Furthermore, the density of the surface warp is 80 strands / cm, the density of the surface weft is 40 strands / cm, the density of the inner warp is 8 strands / cm, and the density of the inner weft is 4 strands / cm.

[0012] Furthermore, the connecting nodes of the surface layer and the inner layer in a complete cycle organizational unit of the base fabric are: the node where the 10th surface warp sinks and is interwoven with the 1st inner weft, the node where the 110th surface warp sinks and is interwoven with the 11th inner weft, the node where the 1st inner warp is lifted and is interwoven with the 110th surface weft, and the node where the 11th inner warp is lifted and is interwoven with the 10th surface weft.

[0013] Furthermore, the waterborne polyurethane foamed synthetic leather is prepared by dipping the base fabric into the waterborne polyurethane foaming slurry and then drying it. The waterborne polyurethane foaming slurry includes waterborne polyurethane with high solid content, a thickener and a foaming agent.

[0014] Furthermore, after the base fabric is impregnated with the water-based polyurethane foaming slurry, it is dried and sanded to form a suede surface on the nap layer of the base fabric.

[0015] The invention has the following beneficial effects: the base fabric of the invention has a double-layer structure, the surface layer is a tightly structured nap layer, which can form a nap surface after being sanded; the inner layer is a lattice layer, which is formed by a lattice structure and has pores for water-based polyurethane to enter the base fabric; after the base fabric is impregnated with water-based polyurethane foaming slurry, the water-based polyurethane foaming slurry enters the base fabric through the pores of the lattice layer, the impregnation is relatively thorough, and the impregnation effect is good; after drying, a foamed water-based polyurethane layer is formed between the surface layer and the inner layer of the base fabric, so that the final water-based polyurethane foamed synthetic leather has a good sense of thickness and fullness; in addition, the foamed water-based polyurethane layer is combined with the lattice layer and the nap layer, so that the synthetic leather product has good air permeability; the invention adopts a tightly structured nap surface formed by using a superfine fiber woven fabric interlaced with warp yarns and weft yarns in combination with the nap layer, so that the final synthetic leather product has a softer and more delicate hand feel, better surface smoothness and better moisture absorption and air permeability. In addition, the synthetic leather of the present invention uses water-based polyurethane to replace oily polyurethane resin, and its production process does not need to use DMF, which can save the process of recovering DMF, is beneficial to energy saving and environmental protection, and also makes the production process safer. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a diagram of the organizational structure of the base fabric in the ultrafine fiber waterborne polyurethane foamed synthetic leather of the present invention. DETAILED DESCRIPTION

[0017] The preferred embodiments of the present invention are described in detail below in conjunction with the accompanying drawings so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making a clearer and more definite definition of the protection scope of the present invention.

[0018] Example

[0019] The present invention provides a superfine fiber water-based polyurethane foamed synthetic leather, which comprises a base fabric and a foamed water-based polyurethane layer;

[0020] Figure 1 The organizational structure diagram of the base fabric in the ultrafine fiber waterborne polyurethane foamed synthetic leather; Figure 1In the figure, "■" indicates the warp tissue point of the surface tissue, "×" indicates the warp tissue point of the lining tissue, and "○" indicates that the lining weft is put in and the surface warp is raised; the base fabric has a double-layer structure with a surface layer and a lining layer, the surface layer is a raised layer, and the lining layer is a lattice layer; a complete cycle tissue unit of the base fabric includes 200 surface wefts, 20 lining wefts, 200 surface warps and 20 lining warps, and the complete cycle tissue unit is formed by the circulation of small cycle tissue units, each of which includes 20 surface warps, 2 lining warps, 20 surface warps, weft and two inner wefts; the surface weft, inner weft, surface warp and inner warp are all microfiber yarns; the surface weft and surface warp are woven into the surface layer of the base fabric with the surface tissue, and the inner weft and inner warp are woven into the inner layer of the base fabric with the inner tissue; the surface tissue is five three-fly weft satin, and the inner tissue is plain weave; the surface layer and the inner layer are connected by the nodes formed by the interweaving of the surface warp and the inner weft and the nodes formed by the interweaving of the inner warp and the surface weft; the lattice layer of the base fabric has pores for water-based polyurethane to enter the base fabric, and the foamed water-based polyurethane layer is filled between the surface layer and the inner layer of the base fabric.

[0021] More specifically, in this embodiment, the connection nodes of the surface layer and the inner layer in a complete cycle organizational unit of the base fabric are designed as: the node where the 10th surface warp sinks and interweaves with the 1st inner weft, the node where the 110th surface warp sinks and interweaves with the 11th inner weft, Figure 1 The “▲” in the figure indicates the two nodes: the node where the first inner warp is lifted and interlaced with the 110th outer weft, and the node where the 11th inner warp is lifted and interlaced with the 10th outer weft. Figure 1 The “●” in represents the two nodes.

[0022] In this embodiment, the microfiber yarns used in the warp and weft yarns are: 75D polyester DTY yarn for the surface warp, 260D sea-island yarn for the surface weft, 160D polyester-nylon composite yarn for the lining warp, and 160D polyester-nylon composite yarn for the lining weft.

[0023] Among them, the density of the surface warp is 80 strands / cm, the density of the surface weft is 40 strands / cm, the density of the inner warp is 8 strands / cm, and the density of the inner weft is 4 strands / cm.

[0024] A complete circular organizational unit of the base fabric has an actual size of 2.5 cm×5 cm on the fabric surface, and the grid layer has 20×20 grids within the 2.5 cm×5 cm fabric surface, that is, the size of each grid is 0.125 cm×0.25 cm.

[0025] The waterborne polyurethane foaming synthetic leather is prepared by dipping a base fabric into a waterborne polyurethane foaming slurry and then drying the base fabric. The waterborne polyurethane foaming slurry comprises 100 parts of waterborne polyurethane with high solid content, 1-3 parts of a thickener, 1-3 parts of a foaming agent, and 30-60 parts of deionized water.

[0026] After the base fabric is impregnated with the water-based polyurethane foaming slurry, it is dried and sanded to form a suede surface on the nap layer of the base fabric, thereby obtaining a finished product of the ultrafine fiber water-based polyurethane foaming synthetic leather.

[0027] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A superfine fiber waterborne polyurethane foamed synthetic leather, characterized in that: It comprises a base fabric and a foamed water-based polyurethane layer; the base fabric is a double-layer structure with a surface layer and an inner layer, the surface layer is a nap layer, and the inner layer is a lattice layer; the base fabric comprises a surface weft, an inner weft, a surface warp and an inner warp; the surface weft, the inner weft, the surface warp and the inner warp are all ultrafine fiber yarns; the surface weft and the surface warp are interwoven into the surface layer of the base fabric using the surface tissue, and the inner weft and the inner warp are interwoven into the inner layer of the base fabric using the inner tissue; The surface weave is a satin weave with five three-fly wefts, and the lining weave is a plain weave. The surface layer and the lining layer are connected by nodes formed by interweaving the surface warp and the lining weft, and by nodes formed by interweaving the lining warp and the surface weft. The lattice layer of the base fabric has pores for water-based polyurethane to enter the base fabric, and the foamed water-based polyurethane layer is filled between the surface layer and the lining layer of the base fabric. A complete cycle organization unit of the base fabric includes 200 surface wefts, 20 inner wefts, 200 surface warps and 20 inner warps, and the complete cycle organization unit is formed by the circulation of small cycle organization units, each small cycle organization unit includes 20 surface warps, 2 inner warps, 20 surface wefts and 2 inner wefts; The surface warp is made of 75D polyester DTY yarn, the surface weft is made of 260D island-in-the-sea yarn, the lining warp is made of 160D polyester-nylon composite yarn, and the lining weft is made of 160D polyester-nylon composite yarn; the density of the surface warp is 80 strands / cm, the density of the surface weft is 40 strands / cm, the density of the lining warp is 8 strands / cm, and the density of the lining weft is 4 strands / cm; The connecting nodes of the surface layer and the inner layer in a complete cycle organizational unit of the base fabric are: the node where the 10th surface warp sinks and is interwoven with the 1st inner weft, the node where the 110th surface warp sinks and is interwoven with the 11th inner weft, the node where the 1st inner warp is lifted and is interwoven with the 110th surface weft, and the node where the 11th inner warp is lifted and is interwoven with the 10th surface weft.

2. The ultrafine fiber waterborne polyurethane foamed synthetic leather according to claim 1, characterized in that: Waterborne polyurethane foam synthetic leather is obtained by dipping a base fabric into a waterborne polyurethane foam slurry and then drying it.

3. The ultrafine fiber waterborne polyurethane foamed synthetic leather according to claim 1, characterized in that: The nap layer of the base fabric is sanded to form a nap surface.

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