Polyurethane leather filler doped with nano SiO2 and Al2O3

Abstract

The invention relates to polyurethane leather filler doped with nano SiO2 and Al2O3, which comprises a polyurethane polymer and is characterized in that: the system contains nano SiO2 and Al2O3 which are doped in the system through aqueous dispersion and surface modification processes. The leather filler made in the invention has fine emulsion particles which are 50nm-100nm commonly, wherein the surfaces or the interiors of particles are doped with nano SiO2 and Al2O3 particles; meanwhile, the emulsion viscosity is reduced, the surface tension of an emulsion is improved, the infiltration edge contact angle is reduced, and strong seepage force is achieved. When reaching a certain depth, the leather filler has better automatic crosslinking effect along with the disappearance of moisture, increases the strength of the leather and the connection between particle surfaces and a reticular layer and ensures that the leather has solid and plump surface and good handfeel.

Description

technical field [0001] The invention relates to the technical field of leather chemical industry, in particular to a nano-SiO 2 、Al 2 o 3 Doped polyurethane leather filler. technical background [0002] Leather filler is an important leather chemical raw material, and its function is to make the leather full, firm, elastic and increase the strength of the leather. At present, the better fillers are filled resins, which mainly include acrylic acid and polyurethane. However, due to the stricter requirements on fillers, such as small emulsion particles, strong penetration depth, good cross-linking ability, full and not loose surface, And feel is good etc., the realization of these indexes, according to the resin of single system, is difficult to reach, in order to meet above-mentioned requirement, the present inventor designs a kind of nano-SiO 2 、Al 2 o 3 Doped polyurethane leather filler, to make up for the deficiencies in the above-mentioned background technology. Co...