Synthesis Of Resole Resin And Its Application In Thermo-Crosslinking CTP Plate

A resole resin was prepared with bisphenol A and formaldehyde, and its application in the thermlo-crosslinking CTP plate was studied. The following study has been conducted:l.The effects of temperature and the variety, concentration and dosage of the catalyst on the synthesis reaction were studied , the optimum reaction condition was found. The effects of reaction time and the molar ratio of aldehyde to phenol on the molecular weight and methylol group content of resole resin were also studied2.The effects of the impurities (sodium hydroxide, formaldehyde, hydrogen chloride and water) that might be contained in the resole resin on the imaging properties of the thermo-crosslinking CTP plates were studied. 3.The effects of the molecular weight and methylol group content of theresole resin on the imaging properties of the double-resin system werestudied, the formula of its thermo-sensitive layer were also studied.4. The possibility of preparing a thermo-sensitive CTP plate with a thermo-sensitive layer whose main composition are resoleresin .diphenyliodonium salt and IR absorbing dye was studied and the formula of the its thermo-sensitive layer was also studied.The results show that: The reaction time and phenol to aldehyed molar ratio are respectively the main factors which affect the molecular weight and methylol group content of resole resin , so the molecular weight and methylol group content of resole resin can respectively be controlled through dominating the phenol to aldehyed molar ratio and reaction time. A resole resin whose methylol groupindex is about 3 and inherent viscosity is about 8 is fit for thedouble-resin system and the optimum formula of its thermo-sensitive layer is m(novolak):m(resole resin):m(diphenyliodonium salt):m(IR absorbing dye)=l : 0.86 : 0.57 : 0.330 Thenno-crosslinking CTP plate can also be prepared with a thermo-sensitive layer comprising a resole resin .diphenyliodonium salt and IR absorbing dye, and the optimum formula of this plate is m (resole resin ): m (diphenyliodonium salt): m (IR absorbing dye) =1: 0.31: 0.260This study is the groundwork of developingthermo-corsslinking CTP plate, and the research results bear someinstructive meaning to the industrialization of thermo-crosslinking CTP plate.