New perfluoroalkyl-crosslinked polymer used as shaped article e.g. film in chemically and thermally aggressive environment.

NOVELTY - Photoinitiator emulsion comprises a photoinitiator, where the photoinitiator emulsion is prepared by dimethylolpropionic acid, dimethylformamide, polyisocyanate, catalyst, diisocyanate, 2-hydroxy-methylphenylpropane-1-one, triethylamine and deionized water, the photoinitiator emulsion is subjected to electron-rich treatment, and the particles are negatively charged.

USE - Used as photoinitiator emulsion.

ADVANTAGE - The photoinitiator emulsion has good compatibility with the resin system, and does not easy to agglomerate and migrate.

DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for: a method for preparing photoinitiator emulsion, comprising (i) placing dimethylolpropionic acid and dimethyl formamide in a reaction kettle, heating to 45-65℃ under nitrogen atmosphere, dissolving the dimethylolpropionic acid, (ii) dropping the mixed solution of polyisocyanate and catalyst into the reaction kettle, reacting for 4-6 hours, (iii) cooling to 35-45℃, dropping the mixed solution of diisocyanate and catalyst, maintaining the temperature and reacting for 1.5-2 hours, (iv) heating to 70-80℃ adding the mixed solution of 2-hydroxy-methylphenylpropane-1-ketone and catalyst, reacting until the isocyanate group reaches the theoretical value, vacuum extracting and removing the solvent, cooling to obtain the semifinished product photoinitiator, (v) adding triethylamine to the semi-finished product photoinitiator to neutralize, where the adding weight of the triethylamine is 60 wt.% of the dimethylolpropionic acid, (vi) adding at least 1.5 times of deionized water into the semi-finished product photoinitiator, uniformly mixing, performing electron-rich operation on the mixed solution, where the control voltage is not higher than 48v and the time is 3-5 hours and (vii) cutting and dispersing the semi-finished product photo-initiator after the electron rich operation by an emulsifying machine at high speed.