Adsorptive environment-friendly type waterborne synthetic leather base and preparation method thereof

Abstract

The invention relates to the field of synthetic leather, and in particular to an adsorptive environment-friendly type waterborne synthetic leather base and a preparation method thereof. The adsorptiveenvironment-friendly type waterborne synthetic leather base is characterized in that waterborne synthetic leather is prepared by foaming base cloth by adopting bamboo vinegar after coating the base cloth by adopting a waterborne polyurethane coating material, wherein the waterborne polyurethane coating material is prepared from the following components in percentage by mass: 20 to 60 percent of waterborne polyurethane emulsion, 5 to 15 percent of wood powder and / or wood pulp, 2.0 to 20 percent of an adsorptive material, 0 to 20 percent of calcium carbonate and 0.1 to 2.0 percent of a processing agent. According to the adsorptive environment-friendly type waterborne synthetic leather base disclosed by the invention, the bamboo vinegar is adopted for foaming, generation of an acetic acid foaming microporous structure is avoided, the tensile strength, the tear strength and the wear resistance can achieve the level of DMF (Dimethyl Formamide) wet foaming, DMF is not used in the whole process, formaldehyde and the DMF in an obtained synthetic leather product are not detected, and requirements of ecological synthetic leather can be met.

Description

technical field [0001] The invention relates to the field of synthetic leather, in particular to an absorbent and environment-friendly water-based synthetic leather base and a preparation method thereof. Background technique [0002] The production method of wet-process polyurethane synthetic leather is to add DMF solvent and other fillers and additives to polyurethane wet-process resin to make a mixed solution. (DMF) has affinity, and the water that is incompatible with polyurethane resin, the solvent (DMF) is replaced by water, and the polyurethane resin gradually solidifies, thus forming a porous film, that is, the microporous polyurethane grain layer, which is customarily called bass (Transliteration of English BASS), which means the base material (semi-finished leather). Bass can only become polyurethane synthetic leather after dry veneer or surface finishing, such as surface printing, embossing, grinding and other processes. finished product. [0003] The typical syn...

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Problems solved by technology

[0007] "Nanchang University" 2011 master's thesis "Exploration of Aqueous Polyurethane Acid Bath Coagulation Film Formation" paper discloses the use of acetic acid to foam water-based polyurethane emulsion to prepare synthetic leather, but also discloses that the surface and cross-section of WPU acid bath demulsification method have There are many microporous structures, among which the microporous structure without wood powder is richer than that with added wood powder, but no matter which one, compared with the solvent-based PU wet method, the microporous structure is still quite different. Therefore, WPU acid bath demulsification method needs further research from theory to practice

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