The Origin of Neutral polyester sizing agent

Sizing papermaking process, the degree of sizing is an important physical indicators indicate the quality of paper or paperboard, and the sizing process is to use the strong hydrophobic material covering the surface of the paper fibers to form a layer of hydrophobic filmreduces the fiber surface free energy, in order to resist the diffusion of water or other liquids on the fiber surface, wetting or penetration, and with this performance material called sizing agent.

The earliest material as a sizing agent is a natural rosin, since the discovery in 1807, it was used nearly 200 years, is still used, just through a variety of methods were modified, conventional sizing acidic sizing, sizing process must make use of aluminum sulfate as a retention agent, rosin acid with negative charge retention in the fiber, to achieve the purpose of sizing, though later on the rosin was modified, prepared maleic rosin saponification gum, fumaric acid rosin, acrylic rosin sizing effect greatly improved, but still must be carried out under acidic conditions sizing.

Many shortcomings due to the acidic sizing, so attention has turned to neutral sizing, 1956, the successful development of synthetic sizing agent of AKD, invented in 1968, ASA synthetic sizing agent, because of the sizing agent of the class applied for reactive glue, can and fiber reaction, keep their own, and thus do not need the help of aluminum sulfate, sizing in high PH value, neutral or alkaline sizing.

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