Waterborne polyurethane composite leather and preparation method thereof
A water-based polyurethane and polyurethane technology, which is applied in textiles and papermaking, can solve the problems of large fluctuations in product performance, inability to meet high-strength requirements, and high manufacturing costs.
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[0043]The present invention provides a water-based polyurethane composite leather and a preparation method thereof. The water-based polyurethane composite leather includes a leather blank 5 and a surface treatment layer 4. The leather blank 5 includes a base cloth layer 1, an adhesive layer 2 and a surface layer 3. An adhesive layer 2 and a surface treatment layer 4 coated on the surface layer 3 are arranged between the base cloth layer 1 and the surface layer 3 .
[0044] As a further improvement, the surface treatment layer 4 includes polyurethane, bridging agent, tackifier and smoothing agent; the mass percentage of each material component of the surface treatment layer 4 is: polyurethane 88.7% ~ 90.7%, bridging agent 1.7% ~3.7%, tackifier 0.5%~1.5%, smoothing agent 6.1%~8.1%; bridging agent is multifunctional carbodiimide polymer, tackifier is basic tackifier, such as acrylic polymer; The smoothing agent is silicon-based and its silicon polymer.
[0045] The surface layer...
Embodiment 1
[0059] A kind of water-based polyurethane composite leather provided by the present embodiment and preparation method thereof,
[0060] First prepare the release paper mold and the base cloth layer; the production environment temperature is 0°C to 40°C, and the production environment humidity is 20% to 80%;
[0061] S1 surface layer is made, according to each material component of this surface layer 3, select mass percent to be 57.4% polyurethane, 2.8% bridging agent carbodiimide, 3.0% basic tackifier, 13.9% inorganic pigment iron oxide and carbon The surface layer solution is prepared with black, and the balance is water as the dissolution medium; the stirring speed of the prepared surface layer solution is 720rpm to 880rpm, and the stirring time is 60min to 65min, so that the viscosity of the surface layer solution is 4800cps; the surface layer solution is fully degassed. , the processing time is 60min~65min; the speed of surface layer solution coating processing is 9m / min, ...
Embodiment 2
[0069] Another water-based polyurethane composite leather and preparation method thereof provided in this embodiment differ from Example 1 in that:
[0070] S1 surface layer is made, according to each material component of this surface layer 3, select mass percentage to be 50.4% polyurethane, 1.7% bridging agent carbodiimide, 8.0% basic tackifier, 16.5% inorganic pigment iron oxide and carbon The surface layer solution is prepared with black, and the balance is water as the dissolution medium; the stirring speed of the prepared surface layer solution is 720rpm to 880rpm, and the stirring time is 60min to 65min, so that the viscosity of the surface layer solution is 4500cps; the surface layer solution is fully degassed , the processing time is 60min~65min; the speed of surface layer solution coating processing is 11m / min, and the usage amount is 75g / m 2 ~125g / m 2 ; The surface layer is dried and molded at a temperature of 100°C to 125°C for 2.5 minutes.
[0071] S2 Adhesive l...
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