Neutral rosin sizing agent and its prepn

Abstract

The rosin sizing agent consists of main components including modified rosin, tall oil, stearic acid, pine gum and paraffin; and supplementary material including polyethenoxy ether sulfo succinate, abietate, polymer dispersant and disinfectant. It is prepared through low pressure process with relatively high controllability and production quality stability. The sizing agent has high compatibility with calcium carbonate stuffing, high sizing effect, low production cost and less mildew produced in storage. The sizing agent is suitable for use in producing high-grade paper and paper card.

Description

Technical field: [0001] The invention relates to a rosin neutral sizing agent and a preparation method thereof, which is a production technology of additives used in papermaking in the paper and cardboard production process. Background technique: [0002] At present, the rosin sizing agent widely used in papermaking in most domestic paper mills can only be used for acid sizing in the range of HP4.5~6.5, and calcium carbonate cannot be used as filler. The paper produced is low in strength and durable. Poor, easy to yellow, brittle. The rosin neutral sizing agent can not only sizing under neutral conditions, improve the quality of paper, but also reduce production costs, reduce pollution, and can overcome the traditional neutral sizing agent AKD is easy to hydrolyze (bringing to the papermaking process) "White pollution"), low friction coefficient and other shortcomings. Its remarkable advantages have attracted the attention of scholars at home and abroad. Japanese patent WO...

AI Technical Summary

Problems solved by technology

Its remarkable advantages have attracted the attention of scholars at home and abroad. Japanese patent WO92 / 17645 and European patent EP0537682A1 have disclosed the production technology of neutral sizing agent, but there are also the following deficiencies: (1) the research on the emulsification problem only stays In the research on the type and structure of a single type of emulsifier, the emulsifier used is only a single type of emulsifier, and the emulsion is not easy to emulsify; (2) in the preparation method, high pressure method and solvent method are adopted, and the high pressure method costs too much High, while the solvent method is not only costly but also pollutes the environment

Chinese patent CN1202554A (publication number) discloses a kind of production technology of the improved rosin neutral sizing agent, but still there are following deficiencies: (1) the main agent in its composition only adopts modified rosin resin, then with carbonic acid The compatibility of the calcium filler is not enough, the content of the calcium carbonate filler is allowed to be limited to 5-20%, and the content of the filler in the actual production of papermaking is mostly more than 20%, thereby limiting its scope of use; (2) the sizing agent emulsion is in In the storage process, it is easy to produce the reproduction of mold, thereby affecting the quality of the product; (3) its preparation method is to directly adopt the normal pressure reversal method of producing common dispersed rosin gum, which is not easy to achieve good emulsification effect, and the quality of different batches is different. Stability is difficult to guarantee