Toning promoter for preparing diazo positive image bromide paper

Abstract

The invention comprises: 5-55% caffeine, 5-25% loop thiourea, and 20-75% alkyl urea. This invention overcomes the defect in prior art, improves result and shortcuts time, and can obtain the request one-time at low temperature.

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