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Flocculating agent composition for preparing ray emulsion and desalination and concentration method

The technology of a composition and a flocculant is applied in the field of preparation of ray silver halide emulsion, which can solve the problems of large water consumption, heavy operating load, influence on the coating property of emulsion, etc., so as to reduce production energy consumption, reduce air-conditioning load, and reduce processing costs. load effect

Inactive Publication Date: 2010-12-01
TIANJIN MEDIA IMAGING MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Disadvantages: heavy operating load, low production efficiency, unconcentrated emulsion, low desalination efficiency and high consumption of deionized water
Disadvantages: The emulsion is not concentrated, the water consumption is large, and the high-precision semi-permeable membrane operation and maintenance costs are high
The sedimentation method uses gelatin flocculant (or sedimentation agent) or modified gelatin to realize emulsion concentration and desalination by adjusting the pH value of a mature emulsion. Disadvantages: the use of modified gelatin has a negative effect on the physical and chemical properties of the ray emulsion, while Single use of gelatin flocculant (or sedimentation agent), the desalination efficiency, concentration ratio and silver loss of the primary mature emulsion cannot be taken into account, and it will affect the spreadability of the emulsion

Method used

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  • Flocculating agent composition for preparing ray emulsion and desalination and concentration method
  • Flocculating agent composition for preparing ray emulsion and desalination and concentration method
  • Flocculating agent composition for preparing ray emulsion and desalination and concentration method

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0028] Example 1: Ammonia-based silver halide radiation-sensitive emulsion was prepared by conventional emulsification. Among them, the silver halide can be pure silver bromide, or silver bromoiodide (Br - :I - molar ratio greater than 80:20; Br:I molar ratio greater than 95:5 is better), or bromoiodosilver chloride (Br - :I - :Cl - The molar ratio is about 98:1:1). Preparation method: Add silver solution (containing 140L deionized water) to the base liquid (containing 150L deionized water, 12kg inert photographic gelatin, 0.6kg potassium iodide, 0.3kg potassium chloride and 44kg ammonium bromide) at 55°C for 5 minutes at a constant flow rate , silver nitrate 32kg, ammonia water 16L and ammonium nitrate 8kg); after an interval of 2 minutes, add the silver solution (containing deionized water 140L, silver nitrate 32kg, ammonia water 16L and ammonium nitrate 8kg) at a constant flow rate for 15 minutes; adjust the pH value to 6.5 with acetic acid -8, the first maturation of ...

example 2

[0032] Example 2: The primary ripening of the emulsion is the same as in Example 1.

[0033]Desalination stage: Add 6% flocculation (or sedimentation) agent conforming to the b structure to the primary mature emulsion, 33kg; add acid to adjust the pH value to below 4.5, and leave the gelatin silver halide emulsion below 20°C to achieve a desalination concentration (detection The conductivity of the dumped mother liquor and the concentration of silver ions); once the sedimented medicine cake is added to 200L deionized water (not exceeding 60°C), the medicine cake is completely dissolved after the alkali is adjusted to a pH value above 7.5; after stirring for more than 10 minutes, add acid again to adjust When the pH value is below 4.5, add 150L of low-temperature deionized water below 20°C, and let the gelatin silver halide emulsion stand below 20°C to achieve secondary desalination and concentration (detect the conductivity and silver ion concentration of the dumped mother liqu...

example 3

[0036] Example 3: The primary ripening of the emulsion is the same as in Example 1.

[0037] Desalination stage: Add 4% flocculation (or sedimentation) agent conforming to the c structure to the primary mature emulsion, 35kg; add acid to adjust the pH value to below 4.5, and leave the gelatin silver halide emulsion below 20°C to achieve a desalination concentration (detection The conductivity of the dumped mother liquor and the concentration of silver ions); once the sedimented medicine cake is added to 200L deionized water (not exceeding 60°C), the medicine cake is completely dissolved after the alkali is adjusted to a pH value above 7.5; after stirring for more than 10 minutes, add acid again to adjust When the pH value is below 4.5, add 150L of low-temperature deionized water below 20°C, and let the gelatin silver halide emulsion stand below 20°C to achieve secondary desalination and concentration (detect the conductivity and silver ion concentration of the dumped mother liq...

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PUM

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Abstract

The invention discloses a flocculating agent composition for preparing a ray emulsion and a desalination and concentration method. By widening the concentration ratio range of a primary mature emulsion, the flocculating agent composition meets the requirements of different-purpose films on the preparation of the ray emulsion. The flocculating agent composition consists of at least two polymers which accord with the requirement, or at least two polymers which are the same type according with the requirement and have different degrees of polymerization. The flocculating agent composition can perform flocculation (or precipitation) in an acid medium so as to desalt and concentrate the emulsion. Due to the silver halide emulsion high-efficiency desalination and concentration technology, the desalination and concentration method effectively reduces the content of impurity ions in the emulsion, reduces the bulk temperature for coating and drying, and improves the performance for preserving the film photographic properties.

Description

technical field [0001] The present invention relates to the preparation technology of radiation silver halide emulsion, more specifically, relates to a kind of emulsion desalination and concentration technology used in the preparation process of radiation-sensitive emulsion (hereinafter referred to as radiation emulsion). Background technique [0002] The preparation of ray emulsion is an important part of ray film production technology. Radiographic films, including medical radiographic films (such as: chest X-ray films, orthopedic films, dental films, breast films, etc.), industrial radiographic films (such as: general-purpose industrial radiographic films, gamma-ray and high-energy radiographic films). Radiographic film has the characteristics of easy operation, intuitive results, and file preservation, which are not available in digital image recording materials based on computer technology applications, and are also the vitality of radiographic film as a professional im...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G03C1/005G03C1/025
Inventor 张含光刘书强史小萌
Owner TIANJIN MEDIA IMAGING MATERIALS
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