Preparation And Application Of Water-dispersed Polysiloxane-polyurethane Rosin Sizing

Over the years, rosin was acted as a sizing agent in china because of its practicality and water repellency. In recent years, due to the rapid depletion of petroleum oil, we need to develop new natural organic polymer sizing agent product as a candicate. The nature modified product achieved more attention. However, most of the sizing or sizing agent products are pure chemicals and harmful to environment, so it is essential to develop the environment-friendly sizing in the context of the current situation. The rosin is an abundantly available and renewable resource, is obtained from the exudations of the pine trees. Considering from the current the development of rosin sizing agent industry in China to meet requirement of production, it needs to innovate rosin sizing agent products.In this paper, water-dispersed polysiloxane-polyurethane rosin sizing solutions is prepared using rosin esterification, silicone, 2,4-tolylene diisocyanate,`sodium bisulfite as the main materials. Anionic waterborne sodium bisulfite bloked polyurethane with high bloked ratio. Influence factors of the high dispersion rosin sizing were studied and modification methods of aqueous polyurethane emulsion were described in this paper.Cationic rosin and synthetic sizing agent had other extra emulsifiers in the as-prepared waterborne polyurethane emulsion, such as Span, Tween, dodecyl trimethyl ammonium bromide, etc. In this paper, Especially comparing with traditional sizing agent,there had not other extra emulsifiers in the as-prepared waterborne polyurethane emulsion,such as Span and Tween. To prepared with the Fourier infrared spectrum and Scanning Electron has carried on the attribute. The results shows that the silicone had been grafted to aqueous polyurethanes, and the water-resistance of paper improved obviously. In recent years, polysiloxane-polyurethane has the potential applications as new excellent properties.Water-dispersed polysiloxane-polyurethane emulsions are stable,and the strengths of the films are very perfect. Furthermore, the fabric coated with the modified Water-dispersed polysiloxane-polyurethane Rosin Sizing owns good water resistance and smoothness. when the mass percentage of silicone increased from 10% to15%, the fabric coated with the modified water-dispersed polysiloxane-polyurethane rosin sizing owns good water resistance and smoothness. The physicochemical characteristics of the two tested dispersants at fiber-water interface, including contact angle and sizing degree, were also studied. Compared with conventional acidic rosinemulsion size, neutral rosin size has good sizing efficiency under neutral-alkaline conditions of paper manufacture. Rosin size and rosin ester rosin size are prepared and used for paper sizing under neutral alkaline conditions. The best conditions of application of our products have been determined, the sizing technology of water-dispersed polysiloxane-polyurethane rosin sizing is as following:polyaluminum chloride(PAC)0.8~1.0%, rosin sizing agent 2.0%, cationic polyacrylamide(CPAM)0.05%, calcium carbonate15% with the indirect sizing.