Inorganic fiber paper

Abstract

This invention provides an inorganic fiber paper that consists essentially of inorganic materials and has a basis weight of less than 100 g / m<2> and has been mainly produced by a wet sheet making method. The inorganic fiber paper comprises inorganic fibers and an inorganic binder as materials, wherein the inorganic fibers have been bound to each other with the inorganic binder. In the inorganic fiber paper, the content of impurities during wet sheet making is low, the water resistance and flexibility are good, and satisfactory strength and high porosity can be realized. The inorganic fiber paper is produced from a material comprising 60 to 97% by mass of inorganic fibers having an average fiber diameter of not more than 5 [mu]m and 3 to 40% by mass of an inorganic binder composed mainly of a silica-based flaky inorganic material that has a hydroxyl group content per specific surface area of not less than 20 [mu]mol / m<2> as measured by a BET method, an average particle diameter of not more than 2 [mu]m as measured by a laser scattering method and an aspect ratio of not less than 10.

Description

technical field [0001] The present invention relates to an inorganic fiber paper consisting substantially only of inorganic materials and which can be used as a heat insulating sheet, a heat-resistant sheet, an insulating sheet, a filter sheet, a cushioning sheet, and a reinforcing sheet Wait. The inorganic fiber paper is mainly produced by a wet sheet manufacturing method and contains, as materials, inorganic fibers and an inorganic binder in which the inorganic fibers are bonded to each other. Background technique [0002] In the case of inorganic fiber paper produced by wet papermaking, by using fine-diameter fibers such as fibers having an average fiber diameter of not more than 1 μm as the inorganic fibers, due to entanglement of the fine-diameter inorganic fibers therein, it is possible to produce paper having a thickness of not less than 100 g / m m 2 A high basisweight inorganic fiber paper imparts a predetermined strength; and thus the inorganic fiber paper can be o...

AI Technical Summary

Problems solved by technology

[0005] When an inorganic binder such as an inorganic oxide sol (inorganic oxide sol-based inorganic binder) is used as a binder and when an inorganic oxide sol-based inorganic binder is added as an internal addition during wet sheet production, there is The problem is that the inorganic oxide sol-based inorganic binder has a low retention yield during paper sheet manufacturing, so a large amount of inorganic oxide sol-based inorganic binder must be used; when adding the inorganic oxide sol-based inorganic binder When the mixture is added as an external, there is a problem that the flexibility of the inorganic fiber paper is reduced and the productivity is reduced, thereby increasing the production cost