The invention discloses a preparation method of a paper wet strengthening agent that is modified by organic
silicon, which comprises the following steps: firstly combines the raw materials of
dibasic acid and polyhydric amine into a
polyamine intermediate compound of daiamid. A certain amount of the
polyamine intermediate compound of daiamid,
epoxy chloropropane and an organosilane
coupling agent are taken to react under certain temperature so as to achieve certain
viscosity, and the reaction is halted by adding acid, thus obtaining the paper wet strengthening agent that is modified by organic
silicon. The preparation method of the paper wet strengthening agent that is modified by organic
silicon can reduce the usage of the
epoxy chloropropane and lower the organic
chlorine content in discharged substances; the cross-linked product greatly increases molecular weight and active crosslinking points of molecular chain sections. The product of the paper wet strengthening agent that is modified by organic silicon achieves greatly raised retention degree, can improve not only the
wet strength of paper but also the paper
physical performance such as folding resistance, tensile strength and dry strength, etc., and the superficial water-proof performance of paper can be greatly raised if the paper wet strengthening agent is coated on the surface of paper.