A kind of high-performance cationic rosin glue and preparation method thereof

Abstract

The invention discloses a high-performance cationic rosin size and a preparation method thereof. The high-performance cationic rosin size is prepared by adopting an interworking emulsification system of an amphoteric polymeric emulsifier and a high-cationic-degree polymeric emulsifier and by using a normal-temperature normal-pressure phase inversion method. The preparation method is simple in preparation process and relatively small in investment, and compared with a cationic rosin size prepared by using a conventional normal-temperature normal-pressure phase inversion method, the high-performance cationic rosin size prepared by the method disclosed by the invention is not liable to bubble, relatively small in particle size and relatively good in stability.

Description

Technical field [0001] The invention belongs to the field of polymer synthesis and papermaking chemicals, and relates to a rosin gum, in particular to a high-performance cationic rosin gum and a preparation method thereof. Background technique [0002] Rosin is an extremely important papermaking aid. It is rich in resources. It not only has low sizing cost, but also can meet the sizing requirements of most paper and cardboard. Therefore, although there are many new sizing agents in the market, rosin It can still occupy a dominant position in a wide variety of sizing agents. [0003] Cationic rosin gum is currently the most widely used rosin sizing agent. It carries a positive charge and can be fixed on negatively charged fibers without relying on trivalent aluminum salt. Therefore, the amount of aluminum salt is more than that of anionic dispersed rosin gum. Because it is not restricted by aluminum salt, it can realize neutral sizing and reduce the corrosion of equipment. At pres...

AI Technical Summary

Problems solved by technology

It is difficult to prepare stable cationic rosin glue, mainly because rosin itself is difficult to emulsify and has certain crystallization ability. It is not economical or environmentally friendly, and the high temperature method has higher requirements for emulsifiers. At the same time, rosin molecules have carboxyl groups, which are easy to produce anionic carboxylate ions, which also affects the stability of cationic dispersion systems.

In order to obtain a sufficiently stable cationic rosin gum, it is very critical to select a suitable emulsifier, and there are many related reports. In these studies, the anionic emulsifier and cationic emulsifier mentioned in the patents US5846308, US6369119, and CN1081262C are compatible with each other. However, although anionic and cationic emulsifiers have a strong synergistic effect, their interaction is too strong, making the emulsification process difficult to control, so there are some problems in the preparation of cationic rosin gum, such as the use of polymer anionic emulsifiers and When the polymer cationic emulsifier is mixed with each other, the two are easy to precipitate and co-precipitate. When the small molecule anionic emulsifier and the polymer cationic emulsifier are used together, the small molecule anionic emulsifier is easy to be freed, which affects the stability of the system.

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