High-viscosity water-based suede-like water-based resin and preparation process thereof

Abstract

The invention discloses a high-viscosity water-based suede-like water-based resin. The high-viscosity water-based suede-like water-based resin is prepared from, by weight, waterborne polyurethane resin, matting powder, foam powder, deionized water, suede powder and a thickening agent and can also be prepared from a carbon fiber part, a spandex fiber part, a raw bamboo fiber part and a coupling part; the waterborne polyurethane resin is prepared from polyether polyol, polyester polyol, isocyanic acid, deionized water, a primary chain extender and a secondary chain extender, wherein the primarychain extender is prepared from 2,2-dihydroxymethyl butyric acid, tributylmethoxy tin and methyl fluoronic acid, and the secondary chain extender is selected from amine chain extenders. The preparation method comprises the steps that the isocyanic acid is added for a reaction after the polyether polyol and the polyester polyol are dehydrated; the primary chain extender is added, and ammonium hydroxide is added, so that neutralization is performed to generate salt, and partial deionized water is added while cutting is performed at a high speed for mixing; the secondary chain extender is added,the deionized water is added while stirring is performed at a low speed, and standing is carried out to obtain the waterborne polyurethane resin, and the waterborne polyurethane resin continues to bemixed with remaining components of the high-viscosity water-based suede-like water-based resin to obtain the high-viscosity water-based suede-like water-based resin.

Description

technical field [0001] The invention relates to the technical field of synthetic leather production, in particular to a high-viscosity water-based cashmere imitation water-based resin and a preparation process thereof. Background technique [0002] The rapid development of polyurethane industry, from basic raw materials to products and machinery equipment, has a considerable scale, and the market prospect is very broad. [0003] Suede solvent-based polyurethane microfiber synthetic leather is a kind of polyurethane product, which adopts solvent-based polyurethane impregnation composite technology. DMF as the main component of the impregnation solution, and then into the DMF and H 2 In the coagulation liquid with O as the main component, due to the solvent-based PU and H 2 O is incompatible, while DMF and H 2 The unrestricted miscibility of O makes the solvent-based PU / DMF system due to the H 2 The presence of O, DMF and H 2 The mutual substitution between O makes DMF be...

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Problems solved by technology

[0004] However, there are a series of problems in the above preparation process: on the one hand, the DMF solvent used is polluting, and H 2 O can not completely replace the DMF in the polyurethane, which will cause the residue of DMF in the product, so there are double problems of process pollution and product safety; The color fastness is not high, which is mainly due to the fact that the suede solvent-type polyurethane microfiber synthetic leather mainly includes two components: superfine fiber non-woven fabric and impregnated and filled polyurethane, and there are few active groups on the solvent-type polyurethane. The dye is difficult to dye, and its washing fastness is very poor, it is difficult to meet the requirements of suede polyurethane microfiber synthetic leather, and the current conventional dyeing method using neutral dyes and disperse dyes is prone to neutral dyes and heavy metals. The problem of exceeding the standard and the problem of poor thermal migration resistance of disperse dyes

However, the molecular chain of water-based polyurethane is short, and there are more branched chains and less interchain entanglement. Therefore, compared with solvent-based polyurethane, conventional water-based polyurethane has the defects of low solid content and poor self-thickening property. It is used to treat synthetic leather. , the water resistance and adhesion of the coating film are poor

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