Polyester type large-aperture filtration sponge for ceramic filter and preparation method of large-aperture filtration sponge

Abstract

The invention provides polyester type large-aperture filtration sponge for a ceramic filter sheets and a preparation method of the large-aperture filtration sponge, belongs to the technical field of polyester sponge, and solves the technical problems of relatively small aperture of the conventional polyester sponge and the like. The preparation method of the polyester sponge comprises the following steps: conveying polyester polyol, isocyanate, water, silicone oil and a catalyst to a foaming machine head through a metering pump; adjusting a machine head pressure and a raw material spraying pressure; respectively vacuuming the various raw materials; mixing the various raw materials in a reaction kettle; after the raw materials are stirred at a high speed, uniformly distributing the materials on a conveyor belt of a foaming production line; performing gel reaction in a conveying process of the continuous foaming production line, solidifying and molding the materials to obtain polyurethane flexible foam plastic, and then cutting the plastic into a specified size on line; performing meshing treatment on the cut polyester sponge to obtain the polyester sponge having a PPI value between7 and 15. The preparation method has the advantage of obtaining the large-aperture polyester sponge.

Description

technical field [0001] The invention belongs to the technical field of polyester sponge, and relates to a polyester type coarse-pore filter sponge used for ceramic filters and a preparation method thereof. Background technique [0002] Polyether sponge is made by polymerizing and foaming polyether and isocyanate under the action of various additives. Compared with other sponge products such as polyether, the foam molding of polyester sponge has always been a difficult point in the field of sponge production. Based on its toughness and uniform voids, it is widely used in the skeleton of ceramic filters. [0003] Polyester sponge has a parameter called PPI, that is, the number of holes in the sponge per inch. During the application of ceramic filters, different types of filter media and different filtration flow rates require different grid gap requirements, corresponding to On the polyester sponge, the PPI requirements of the polyester sponge are different. For the PPI of th...

AI Technical Summary

Problems solved by technology

[0006] 1. Because the existing chemical methods and formulas cannot obtain stable macroporous filter sponges. As we all know, the larger the pore size of the sponge, the larger the grid gap in the process of forming it to the limit sponge pore size, and the grids connecting the grids The linker is fragile, resulting in a large amount of collapse and shrinkage of the sponge before it enters the gel process after foaming, so that the large-pore sponge cannot be formed;

[0007] Two: The foaming raw material itself has some small bubbles. These small bubbles not only affect the thoroughness and quality of the foaming nucleation reaction, but also affect the raw material formulation due to the different gas solubility of different raw materials. the accuracy of the comparison;