Several applications of Cationic Polyacrylamide in papermaking industry
Cationic Polyacrylamide is one of the earliest and widely used auxiliaries in papermaking industry, even known as "papermaking additive".
Its application in papermaking mainly has the following aspects:
1. The following effects can be obtained as a retention agent:
Increase the retention rate of fine fibres and fillers, which is manifested in increased ash content and quantitative increase.
Reduce the white water concentration, accelerate the settling speed of white water and improve the efficiency of white water recovery equipment.
Improved the paper molten-based filter water performance, from the online watermark position of the mobile look, increased the dehydration speed, thus improving the speed and leaving the net of paper page dry, saving steam.
With the increase of the amount of anionic Cationic Polyacrylamide, the strength of the paper has little effect, but the evenness of the paper becomes worse.
2. As an enhancer, Cationic Polyacrylamide as a water-soluble polymer, in recent years, in the paper industry as an enhancer has been paid attention, not only can be used as a strength enhancer, but also can be used as humidification strength agent. As a dry strength agent, suitable for food packaging paper, bleached white board and tissues, toilet paper, cardboard, etc. as humidification strong agent, applicable to the drawings of the Hai, banknote paper, photographic original paper, advertising poster paper and advanced wrapping papers.
3. As dispersant, dispersant is a common additive used in papermaking industry to reduce fiber flocculation and improve paper forming. Therefore, also known as "resistance flocculation agent" or "suspending agent", whether manual copying paper or mechanical paper must use fiber dispersant, in order to make paper page tissue leveling well. The practice shows that the molecular weight of the apam should not be less than 7 million, and it is generally not affected by heating and high shear force, but also can be reused after many times, which is beneficial to improve the strength of long fiber and reduce the cost.
4. As a flocculant, Cationic Polyacrylamide can be used as a flocculant in papermaking wastewater treatment section to help it to accelerate sedimentation and remove mud.