N-tetrabutylammonium polyiodide bactericides were synthesized by n-tetrabutylammonium iodide and iodine with different stoichiometric ratios.The structures of the polyiodide anion chains of the polyiodides were analyzed by Raman spectroscopy.The results show that the polyiodide anion chains of n-tetrabutylammonium triiodide,heptaiodide and undecaiodide have the same basic structural unit-I3-,with linear structure;and the polyiodide anion chains of ntetrabutylammonium pentaiodide and nonaiodide have the same basic structural unit-I5-,with linear structure.The structures of the polyiodide anion chains of n-tetrabutylammonium heptaiodide,nonaiodide and undecaiodide present broach-shape,V-shape and transmutative quartet cone-shape separately.

The effects of various activations including HCl activation at room temperature, H2SO4 activation at room temperature, anodic H2SO4 activation, cathodic H3SO4 activation, H2SO4 activation at elevated temperature of 65℃, and H2SO4-CrO3 activation on the uniformity and wear resistance of coloring films of stainless steel were investigated. The potential-time curves of the coloring films on the stainless steel were determined. The relationship between the potential-time curve parameters tb and tc and their influence on the quality of the coloring films on the stainless steel were also explored. It was found that the activation was able to speed the coloring process and helped the formation of bright, uniform, and wear-resistant coloring films. At the same time, the coloring rate of the stainless steel increased with increasing temperature, and anode electrolysis activation was superior to cathode electrolysis activation. Moreover, HCl and H2SO4 with the same concentration had the same activation effect, and the optimal activation was realized by anode electrolesis in 10% H2SO4. In addition, the potential-time curve parameters tb and tc could be used to express the activation effect and the readiness of coloring.

The effects of additives on chemical coloring of stainless steel are investigated in this paper.The results show that the colors of coloring film on the stainless steel at the same potential difference is basically consistent,but the colors move to long wave length direction as the three kinds additive dosages increase;ZnSO4 stabilizes the coloring potential,which not only makes the coloring potential easy to be recorded,but also makes the colors easy to be controled and reappeared;MnSO4 not only plays acceleration role,but also can increase the brightness of the coloring films;and(NH4)6Mo7O24·4H2O can not only enhance the brightness but also reinforce the wearability of the coloring films.

The structure,preparation,mensuration and application of polyiodides were summarized.Resin-polyiodides were prepared by fluidized bed method,solid and liquid polyiodides were prepared by direct reaction method.Means of mensuration of polyiodides are various and X-ray diffraction,Raman and far-IR spectroscopy are primary methods for the characterization of polyiodides.Polyiodides have important applications in the bactericidal and electric fields.

T818B pour point depressant was synthesized by esterification and polymerization,the pour point depression and the depressing mechanism were also discussed in the paper.The results showed that the T818B depressant has excellent depressing effects on naphthenic lube oil when containing 3～5 g/kg the additive,and almost has no effects on waxy lube oil.The depressing mechanism of T818B pour point depressant is that the dibehenyl fumarate-vinyl acetate copolymer changes the directions of the crystallization of the naphthenic lube oil,which makes it difficult to mass into three-dimensional net structure,and so the pour point is depressed.