New research on the application of talcum powder manufacturers in the paper industry (1)

I. Application Status

Talc is widely distributed in the crustal lithosphere and has a large output, which can be widely used in the paper industry. Talc has chemical stability, low hardness, lubricity, lamellar structure, lipophilicity and hydrophobicity. The reasonable use of talc in the paper industry can effectively improve the performance of paper. In China, more than 50% of the talc output is used in the paper industry, and its uses mainly include paper fillers, coatings and resin control agents.

Talc has the following advantages when used as a filler in the papermaking process: ① It is beneficial to improve the smoothness, opacity and printability of the paper; ② The wear value is small, which can extend the service life of the papermaking web; ③ The chemical properties are stable, not only suitable for Acid papermaking, can also be used with calcium carbonate for neutral papermaking; ④ has a good combination with the sizing agent to keep the rubber and prevent printing ink from penetrating; ⑤ has lipophilicity, can adsorb organic substances, make white water and pulp The material system is kept clean, as a filler, it also has the effect of avoiding resin barriers, and it helps to remove the ink in the deinking of waste paper; ⑥ It has certain hydrophobicity and lubricity, which can reduce the water absorption of the paper sheet. Improve the smoothness and softness of the paper sheet, reduce the operational obstacles such as calendering and finishing; ⑦ It is conducive to stay in the paper sheet and reduce the fiber consumption of tons of paper products.

Talc is used as a coating pigment. It has good fiber coverage and printing effect. It can increase the whiteness, opacity, smoothness, and printing gloss of coated paper, give the paper higher ink absorption, and improve the quality of gravure printing. And talc has lubricity, and the coated paper made from it can obtain high finishing on the calender and reduce the amount of lubricant in the coating. However, talc also has corresponding disadvantages due to its hydrophobicity: it is difficult to wet and disperse during the preparation of the coating, and the prepared coating has shear expansion, low retention rate, and easy to cause paper powder. Therefore, some talc is Surface treatment is required before use.

Due to the lipophilic nature of the talc structure, the application of talc in pulp and paper can effectively control the resin and anionic viscosity. On the one hand, it can adsorb the hydrophobic adhesive substances in the papermaking system, reduce the surface energy of the anionic adhesive, and cause it to lose its unique viscosity, thereby inhibiting the adhesion, coalescence and deposition of the adhesive; Adhesives can also adsorb talc, thereby reducing the viscosity of the surface of the adhesive and avoiding further agglomeration and deposition.

In general, talc plays an important role in the papermaking industry due to its unique hydrophobic properties. How to make good use of talc's characteristics to avoid weaknesses needs to be continuously explored.