Positive ion styrene-acrylic emulsion surface sizing agent with high reactivity for papermaking and synthetic method thereof

Abstract

The invention discloses a positive ion styrene-acrylic emulsion surface sizing agent with high reactivity for papermaking and a synthetic method thereof. The synthetic method comprises the following steps of: carrying out pre-emulsification on PVA (Polyvinyl Acetate) aqueous solution, a part of hydrophilic monomer, a part of molecular weight modifier and a part of hydrophobicity monomer in a high-speed emulsifier; when the temperature is 75 DEG, dropwise adding an oil-soluble initiating agent and a mixture of the rest of monomers and the rest of molecular weight modifier for 2-4 hours, carrying out heat preservation at 75-80 DEG C, then heating to 80-85 DEG C, dropwise adding a water-soluble initiating agent and a reducing agent for 30-60 minutes, heating to 85-90 DEG C, rapidly adding a quaternization agent, carrying out heat preservation for 1-1.5 hours, reducing the temperature to 45 DEG C, adding organic acid for adjusting pH value to 2-5, sequentially adding a sterilizing agent and a defoaming agent, fully stirring and discharging. The sizing agent disclosed by the invention has the characteristics of a styrene-acrylic emulsion and very good surface sizing capacity due to the high reactivity and the positive ionicity and can endow paper with good water resistance and surface strength.

Description

technical field [0001] The invention relates to a sizing agent and a synthesis method in the papermaking industry, in particular to a cationic styrene-acrylic emulsion surface sizing agent with high reactivity for papermaking and a synthesis method. Background technique [0002] Secondary fiber is a papermaking resource that takes into account both economic and social benefits, and has received widespread attention from all over the world. The use of secondary fiber to produce high-strength corrugated paper or replace part of the original pulp to produce cultural paper has been widely recognized. The main factors affecting the printing suitability of secondary fiber newsprint are basic physical properties, optical properties, mechanical properties, absorbency and so on. Good printability can not only ensure the smooth progress of printing, but also better ensure the printing quality. Surface sizing is an effective way to improve the printing adaptability of paper. Surface ...

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to provide a cationic styrene-acrylic emulsion surface sizing agent with high reactivity for papermaking and a synthetic method to solve the problem that existing PVA-1788 or PVA-1799 is used as an emulsifying agent and that the water resistance of PVA is relatively poor. The cationic group in the polymer also has strong hydrophilicity, so that the water resistance of the prepared surface sizing agent is insufficient to achieve industrial application, and at the same time, the stability of the reactive surface sizing agent is solved. properties, mechanical resistance and foaming properties