... dropped to 50 ° C, incubated for 10 minutes to carry on the oxidation reaction; continue heating ... raised to 85-90 ° C, incubated for 20 minutes; added diluted with water, the temperature at about ... add the measurement sizing agent slowly, at the same time start stirring, stir reserve; (2). Continuously added , ... in the same position ,and at the same time mix; e.The products do not contain harmful ...