TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Components: The cation is lithium ion, sodium ion or potassium ion.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Components: The sulfonate group is alkenyl sulfonate, allyl sulfonate, methylallyl sulfonate, allyloxyhydroxypropyl sulfonate, methacrylic acid hydroxypropyl sulfonate, 2-acryloylamino-2-methylpropane-1-sulfonic acid, benzene sulfonate and/or olefin sulfonate. The polymerization monomer is acrylic acid methyl ester. The thickness of the polymer film is 10-40 mu m. The concentration of the colloid protecting agent is 5-30 wt.% of the total polymerization monomer. The crosslinking agent is a bond and/or double-double bond as polymerizable monomer. The crosslinking agent is alkenyl benzene, trimethylolpropane triacrylate, propylene carbonate, and/or methylene bis-acrylamide. The content polymerization monomer is 2.0-10.0, preferably 5.0-7.0 wt.%.    TECHNOLOGY FOCUS - POLYMERS - Preferred Components: The polymer colloidal particles are methyl acrylate polymer colloidal particles. The polymer colloidal particle has diameter of 10 nm to 1.0 mu m, preferably 20-200 nm. Preferred Method: The polymer film is prepared by adding colloid protecting agent and distilled water into reaction bottle, heating and stirring until completely dissolving, adding reaction type sulfonate surfactant, polymerization monomer and crosslinking agent, uniformly mixing, and then adding initiator to obtain polymer colloid latex; and coating polymer colloid latex on the plastic base with upper part; and drying after peeling off to obtain the product. The polymerization reaction system is further added with second polymerizable monomer of formula CH2=CR1R2 for polymerization reaction. The second monomer as polymerization monomer is 2-10% of the total weight. The colloid protecting agent is polyethylene alcohol, polyethylene oxide, polyacrylate, and/or polyalkenyl pyrrolidone.R1=H or CH3;R2=C6H5, OCOCH3-CN, C4H6ON, C2H3CO3, COO(CH2)nCH3; andn=14.