Papermaking filler and pretreatment method thereof

Abstract

The invention discloses a papermaking filler and a pretreatment method thereof, and belongs to the technical field of papermaking processes. The filler is active calcium silicate. The pretreatment method for the filler comprises the following steps of: adding the active calcium silicate into hot water of 50 to 100 DEG C, and fully stirring and dissolving the active calcium silicate to form emulsion. The raw material for the filler is extensive in source and low in cost; particularly, waste fly ash in a power plant can be comprehensively utilized for producing the filler, so that the ecological environment and the mineral resources are effectively protected; the filler has short dissolution time, low energy consumption and high activity, and meets the high-filler papermaking requirement; the flow in the pretreatment method is simple, and the filler is fully dispersed and activated; and the pretreated filler can be fully mixed uniformly with plant fibers, so that the internal bonding force between the filler and the fibers is increased and the performance of the paper is improved.

Description

technical field [0001] The invention belongs to the technical field of papermaking production technology, and in particular relates to a papermaking filler and a pretreatment method thereof. Background technique [0002] At present, in the field of conventional paper production, taking cultural paper as an example, a large amount of plant fiber pulp is used as the paper skeleton, and about 7% to 20% of calcium carbonate or calcium carbonate is added to the plant fiber through the high-level box of the paper machine. Traditional mineral fillers such as talcum powder and a small amount of chemical additives complete papermaking. This kind of paper has high printing performance, writing performance and other performances, and has played an indispensable role in the development of human culture and the inheritance of civilization. [0003] The use of fillers in the paper industry is to improve paper uniformity, opacity and reduce costs. The raw materials are mainly inorganic m...

AI Technical Summary

Problems solved by technology

[0005] 1. Most of the fillers are inorganic minerals with low water content (below 10%), mostly in the form of powder. During the dissolution process, due to the fine powder particles, it is easy to agglomerate and float on the liquid surface, which is very difficult. It is difficult to fully dissolve, which not only affects the dissolution time, reduces production efficiency, but also increases energy consumption;

[0006] 2. The existing filler does not contain active functional groups, so the filler has no chemical activity. During the pretreatment process, it cannot be stimulated by means of dissolution heating and stirring and dispersing. Therefore, the backward dissolution technology of constant temperature and constant speed stirring is used;

[0007] 3. At present, conventional fillers used in the papermaking field generally have a high density. During the pretreatment and dissolution process, rapid stirring is required to prevent the filler from settling and stratifying, so the energy consumption of stirring is relatively large.