Toning promoter for preparing diazo positive image sensitive paper

Abstract

The invention relates to a toning accelerator for preparing photosensitive materials, in particular to a toning accelerator for preparing diazo positive photosensitive paper. It contains 5%-55% caffeine, 5%-25% cyclic thiourea and 20%-75% alkyl urea. It solves the disadvantages that the diazo positive photosensitive paper made of existing photosensitive materials generally has a dull color tone and slow development of ammonia smoke. The invention has the obvious effects of correcting the color concentration, promoting color development and shortening the color development time, and its effect is more prominent under low temperature conditions, and can obtain the required image at one time, which solves the problem of long ammonia fumigation time under low temperature conditions. Light hair problem.

Description

technical field [0001] The invention relates to a toning accelerator for preparing photosensitive materials, in particular to a toning accelerator for preparing diazo positive photosensitive paper. Background technique [0002] Diazo positive photosensitive paper is a kind of drawing reproduction material widely used in construction, mechanical processing and other industries. Existing diazonium just like photosensitive paper is generally made by coating a layer of photosensitive material on the paper. ) and 2,3-dihydroxynaphthalene-6-sodium sulfonate and a diazo component and a coupling component are prepared by coupling reaction. The above photosensitive material has the advantages of simple preparation process and low manufacturing cost. However, the diazo positive image photosensitive paper made by the above-mentioned materials and methods generally has the disadvantages that the color tone is not bright, and the development of ammonia smoke is slow. In order to solve...

AI Technical Summary

Problems solved by technology

However, the diazo positive image photosensitive paper made by the above materials and methods generally has the disadvantages of not bright colors and slow ammonia smoke development.

In order to solve these problems, many scientific and technological workers at home and abroad have conducted some research and found that some substances can catalyze the coupling reaction of the two-component diazo positive image photosensitive paper, but these substances are expensive and difficult to buy, and some of them can be used after use. It will greatly shorten the shelf life of diazo photosensitive paper, so many substances cannot be used in actual industrial production