苯并三氮唑在聚乙烯醇为粘合剂的光敏热成像材料中的化学增感

以水溶性聚乙烯醇(PVA)为粘合剂,硬脂酸银(AgSt)为银源,异位AgBr乳剂为光敏元,考察了苯并三氮唑(BZT)在光敏热成像(PTG)材料中的化学增感效应.实验结果表明:BZT首先增感AgBr乳剂,再与PTG材料的其它组分混合,可以明显提高PTG材料的感光度,而超过一定用量范围则导致影像和灰雾完全消失;在40℃增感温度下,增感70 min可取得最佳感光度;另外,BZT首先与AgSt作用一段时间后,再与PTG材料的其它组分混合,其与AgSt的摩尔比为15%左右,可使得PTG材料取得感光度最佳值.

Chemical Sensitization of Benzotriazole in Photothermographic Materials Using PVA as Binder

Chemical sensitization effects of benzotriazole (BZT) on PTG materials were studied, in which polyvinyl alcohol (PVA) and silver stearate (AgSt) was respectively used as binder and silver source, and AgBr light sensitive component was obtaind from ex-situ preparation. The results showed that sensitized AgBr by BZT could effectively increase the sensitivity of PTG materials; Moreover, both image and fog density would not be formed in a higher amount range of BZT. Maximal sensitivity of PTG materials would be obtained by sensitizing AgBr at 40 ℃ in 70 min, or in the ratio of 0.15 BZT mol/mol AgSt when BZT reacted with AgSt and then mixed with other components of PTG materials.