Preparation method for polyurethane netted material special for foamed ceramics

Abstract

The invention discloses a preparation method for a polyurethane netted material special for foamed ceramics, relating to the technical field of the polyurethane netted material. The method comprises the following steps: adding polyether polyol, an amines catalyst, a surfactant, a foaming agent and a pore-forming agent into a container, uniformly mixing and stirring, thereby acquiring a mixed solution; vacuumizing for two times in a vacuum drying oven; adding a tins catalyst, uniformly stirring, adding TDI 80 / 20 and uniformly stirring, thereby acquiring a mixture; quickly pouring the mixture into a mold, placing into a stove, foaming and keeping temperature, thereby acquiring soft pored polyurethane foams; placing the polyurethane foams into a netting solution, extruding the foams and exhausting; cleaning the polyurethane foams and then drying, thereby acquiring the netted polyurethane foams. The polyurethane netted material prepared according to the invention is uniformly pored; the aperture ratio can reach up to 98%; the foam pore net is smooth; the preparation method adopts a simple process, and is easy to operate and suitable for industrial application.

Description

technical field [0001] The invention relates to the technical field of polyurethane foam materials, in particular to a preparation method of a special polyurethane mesh material for foam ceramics with high opening ratio and uniform opening. Background technique [0002] Reticulated polyurethane foam is a new type of functional foam in polyurethane foam. turned into. The reticulated foam removes the original window film, leaving only the open-cell tendon "skeleton" structure, so the reticulated polyurethane foam has excellent air permeability, good flexibility and high mechanical strength, and With permanent elasticity, it can be widely used as filter material. [0003] Foam ceramic filter materials are mainly used for the purification of various non-ferrous metal smelting and casting. However, when polyurethane foam sponge is used as the precursor of foam ceramics, the sponge is required to have a three-dimensional mesh porous shape, and the sponge itself is required to ha...

AI Technical Summary

Problems solved by technology

The disadvantage is that the degree of meshing is relatively low, it is difficult to completely remove the window film, and it is difficult to control the uniformity of the foam pore size.

The other is the indirect preparation method, which means that on the basis of the synthesis of polyurethane foam, a post-processing process-reticulation is carried out to realize the removal of the foam window film. The indirect preparation method can be divided into chemical methods according to the preparation principle. Two types of physical methods, such as chemical corrosion method, steam hydrolysis method, combustion method, explosion method, etc. Steam hydrolysis method will reduce the mechanical strength of polyurethane foam, and the burning time of combustion method cannot be controlled, making it difficult to form useful reticulated foam. Explosion method requires special equipment and is expensive