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70results about How to "Reduce sizing costs" patented technology

Preparation method of surface sizing agent of cationic polyurethane/cationic styrene-acrylic composite emulsion

The invention relates to a preparation method of a surface sizing agent of cationic polyurethane / cationic styrene-acrylic composite emulsion, belonging to the field of paper making chemicals. The preparation method comprises the following steps: adding isophorone diisocyanate, 1,4-butanediol and dehydrated polyethylene glycol oxide into a four-hole boiling flask, and increasing the temperature; stirring and dropwise adding the butanone solution of a cationic chain extender to obtain a prepolymer; decreasing the temperature; adding acid for neutralization; adding acetone for dilution; stirringthe mixture; and then, adding a proper amount of acetone to reduce the viscosity of the prepolymer; adding deionized water into the prepolymer for emulsification; adjusting the pH value to 5-7, and removing the acetone and the butanone to obtain cationic aqueous polyurethane emulsion; and adding the prepared cationic polyurethane, emulsifier and deionized water into the four-hole boiling flask; heating the mixture in the water bath with nitrogen gas protection; stirring the mixture, and increasing the temperature; and adding the water solution of phenyl ethylene, acrylic ester, cationic monomer, acrylamide and water-soluble azo initiators for reaction for 2-4h, cooling the mixture, and then, discharging to obtain a finished product. The invention can improve the sizing effect and reduce the sizing cost.
Owner:MUDANJIANG HENGFENG PAPER CO LTD
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