Composite special type filler combination method

Abstract

The invention discloses a complex method for compounding a special filling, comprising the following steps that: the special filling is dispersed into a dispersed suspending liquid with a mass concentration ranging from 1 to 30 percent, the dispersed suspending liquid is mixed with a macromolecule water solution with a mass concentration ranging from 1 to 25 percent to obtain a mixture, the mixture and an acidic electrolyte bath solution are mixed evenly, or a fatty acid is added into the mixture and is mixed evenly to obtain a solution, and then the solution and the acidic electrolyte bath solution are mixed evenly; after let stand, an upper layer of clear solution is eliminated, a lower layer of white substance is the special compounded filling. The complex method can improve the hydrophilicity of the special filling and the fiber, increases the use amount of the special filling and obviously improves the intensity of the paper. The complex method can improve the retention of the filling, increase the whiteness of the paper, reduces the waste water processing load and further saves the fiber use amount.

Description

technical field [0001] The invention belongs to the field of chemical synthesis, in particular to a compounding method of special fillers used in papermaking and filling process. Background technique [0002] The fillers used in papermaking are generally white mineral pigments. Due to the unique morphological characteristics of these pigments, they have high light scattering ability and absorption. When used as paper fillers, they can improve paper printability, increase opacity, increase smoothness, and increase whiteness. degree and save fiber. Commonly used paper-making fillers are talcum powder, calcium carbonate and china clay. Special fillers are a type of fillers with very high whiteness, very fine particle size, good filling effect, and very expensive prices, including calcined kaolin, silica, titanium dioxide and some polymer fillers. Due to the high price, the amount added is Rarely, it is generally used in low-quantity paper grades (such as newsprint, cigarette ...

AI Technical Summary

Problems solved by technology

Generally, the single-pass retention rate of the filler in the fourdrinier paper machine is about 15%, and the retention rate of the white water is only about 40% after multiple reuses. A large amount of filler will flow away with the water, which not only wastes raw materials, but also increases the water treatment load.

At the same time, there is no binding force between the filler and the fiber, so it is not possible to add too much filler, otherwise it will easily cause powder and hair loss after the paper is formed, which will weaken the strength of the paper and reduce the quality of the paper.

Specialty fillers require increased retention due to their high cost and low usage