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Method for preparing tabular granular silver halide emulsion

A silver halide, flat technology, applied in the field of T-grain silver halide emulsion preparation, can solve the problems of less silver halide, high emulsification temperature, low production capacity, etc., and achieve the effect of saving usage and improving uniformity

Inactive Publication Date: 2015-04-22
TIANJIN MEDIA IMAGING MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Although there are many related literature reports on T-particles, they are more suitable for scientific research, and there are still certain limitations when applied to real industrial production, such as high emulsification temperature, long emulsification time, and less emulsified silver halide. , so the capacity for industrial production is low

Method used

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  • Method for preparing tabular granular silver halide emulsion
  • Method for preparing tabular granular silver halide emulsion
  • Method for preparing tabular granular silver halide emulsion

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] At first 6.48g potassium bromide is dissolved in the 550ml gelatin solution of 0.6% concentration, adjust pH value to 5.6, then be warming up to 65 ℃, add 5.1% silver nitrate solution 25ml instantaneously under the stirring speed of 1000rpm, then simultaneously Add 376ml of 40% silver nitrate and 335ml of 31% potassium bromide into the emulsification pot in an accelerated manner within 40 minutes, ensuring that the final speed is 100 times the initial speed, and at the same time adjust the stirring speed to 1500rpm. Instantly add 10ml of potassium iodide solution and stir for 10min before taking it out of the pot.

[0031]Then the emulsion is cooled to below 45°C, a sedimentation agent β-naphthalenesulfonic acid formal sodium salt (F-16) is added, and a certain amount of acetic acid is added to adjust the pH value of the solution to near the isoelectric point of gelatin. to around 3.8. The excess salt is removed while the silver halide grains are precipitated. Then us...

Embodiment 2

[0034] According to Example 1, potassium bromide was dissolved in: the concentration of gelatin was changed to 1.2%, and other conditions were unchanged.

Embodiment 3

[0036] Potassium bromide was dissolved in according to Example 1: the concentration of gelatin was changed to 2.4%, and other conditions were unchanged.

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Abstract

The invention discloses a method for preparing tabular granular silver halide emulsion. According to the invention, Tabular (tabular) granular (referred to as T-granular) emulsion with a high shape ratio is prepared by a two-step nucleus formation method by use of double-column emulsion, the shape ratio of the emulsion granules is higher than 20, and on the premise of proper scumbling, the maximum density of a film is higher than 3.5 (the silver content on a single surface is about 5.0 g / m2) through certain chemical sensitization. With the adoption of method disclosed by the invention, the dosage of silver is saved on the premise of meeting the market demand. The shape of the crystal is more regular compared with that in the prior art, and the uniformity of the crystal is improved.

Description

technical field [0001] The invention relates to the field of photosensitive material manufacturing, more specifically, relates to a preparation method of a T-grain silver halide emulsion used in the non-destructive testing (NDT) industrial film industry. Background technique [0002] The iodine-containing large-grain silver bromide crystal structure is conducive to improving the photosensitive speed. In the patent US4439520 of Kofron of Kodak Corporation of the United States, the superiority of the T-grain silver halide emulsion with high line ratio was demonstrated for the first time. Solberg applied for a patent US4433048. He improved the T-particles on the basis of his predecessors, pointing out that the sensitivity of iodine in the periphery of the particles is higher than that of iodine in the center of the particles, and the rapid increase of iodine concentration is better than the gradual increase of iodine concentration. Grains are more defined. However, the thickn...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G03C1/015
Inventor 东继莲闫海永张涛张春生王晓杰
Owner TIANJIN MEDIA IMAGING MATERIALS