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Polymer settling agent for preparation of ray emulsion, and settling desalting method

A polymer and sedimentation agent technology, applied in the field of desalination, can solve problems such as the influence of emulsion coating, heavy operating load, and high maintenance costs, and achieve the effects of reducing negative impacts of operations, reducing air-conditioning loads, and improving production effects

Inactive Publication Date: 2011-06-29
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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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Example 1: Ammonia-based silver halide radiation-sensitive emulsion was prepared by conventional emulsification. Wherein, the silver halide can be pure silver bromide, or silver bromoiodide (Br:I molar ratio is greater than 80:20; Br:I molar ratio is better than 95:5), or silver bromoiodochloride (Br:I :C1 molar ratio of about 98:1:1). Preparation method: Add silver solution (containing deionized water and 1401, silver nitrate 32kg, ammonia water 16 1 and ammonium nitrate 8kg); after an interval of 2 minutes, add silver solution (containing deionized water 140 1, silver nitrate 32kg, ammonia water 16 1 and ammonium nitrate 8kg) at a constant flow rate for 15 minutes; acetic acid adjustment When the pH value reaches 6.5-8, the primary maturation of the emulsion ends, and the silver content of the primary mature emulsion is about 4.5-5.5g silver / 100ml emulsion.

[0031] Desalting stage: Add 4% (mass percentage concentration) to the primary mature emulsion to meet the re...

Embodiment 2

[0034] Embodiment 2: The primary maturation of the emulsion is the same as the preparation method of Example 1.

[0035] Desalination stage: Add 4% to the primary mature emulsion to meet the requirements of a (artificially synthesized polymers or natural polysaccharides, containing at least one -OSO 3 M, -SO3 M, -COOM, wherein M represents H, alkali metal elements, rare earth metal elements or quaternary ammonium salt ions) polymer-type settling agent 35kg, wherein the polymer monomer concentration is 65-85%; add acid to adjust the pH value to below 4.5 , the gelatin silver halide emulsion is allowed to stand below 20°C to achieve a desalination and concentration (detect the conductivity and silver ion concentration of the dumped mother liquor); once the sedimented medicine cake is added to (not exceeding 60°C) 2001 deionized water, the pH value is adjusted with alkali After reaching 7.5 or more, the medicine cake is completely dissolved; stir for more than 10 minutes, add aci...

Embodiment 3

[0038] Embodiment 3: The primary maturation of the emulsion is the same as the preparation method of Example 1.

[0039] Desalting and concentrating stage: add 4% (artificially synthesized polymer or natural polysaccharide, containing at least one -OSO) to the primary mature emulsion 3 M, -SO 3 M, -COOM, wherein M represents H, alkali metal elements, rare earth metal elements or quaternary ammonium salt ions) polymer-type sedimentation agent 35kg, wherein the molecular weight range is 20,000-150,000; add acid to adjust the pH value to below 4.5, gelatin silver halide emulsion Stand below 20°C to achieve a desalination and concentration (detect the conductivity and silver ion concentration of the dumped mother liquor); once the sedimentation medicine cake is added to (not exceeding 60°C) 180 1 deionized water, the alkali adjusts the pH value to above 7.5 The drug cake is completely dissolved; stir for more than 10 minutes, add acid again to adjust the pH value to below 4.5, an...

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Abstract

The invention discloses a polymer settling agent for preparation of ray emulsion and a settling desalting method. The polymer settling agent for preparation of the ray emulsion at least meets one of the following two conditions that: (1) a water-soluble artificially synthesized polymer at least comprises one of -OSO3M, -SO3M and -COOM, wherein M is H, an alkali metal element, a rare earth metal element, or quaternary ammonium salt and the like; and (2) ionic monomer concentration is 65 to 85 percent, and the molecular weight range is 20,000 to 150,000. The method is implemented by the following steps of: a, desalting the emulsion at one time, namely adding the polymer settling agent in an amount which is 2 to 20 percent based on dry weight of gelatin in silver halide-gelatin ripened at one time or gelatin analogue emulsion; and b, settling the solution obtained in the step a, and separating to obtain mother liquor and a chemical cake. By a silver halide emulsion efficient desalting concentration technology, the foreign ion content in the emulsion can be effectively reduced and the whole coating and drying temperature is reduced, and the saving performance of the photography performance of a film is improved.

Description

technical field [0001] The present invention relates to the desalination technology in the preparation process of ray emulsion, more specifically, relates to an emulsion desalination and concentration technology used in the preparation process of radiation-sensitive emulsion (hereinafter referred to as ray 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 image i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G03C1/005G03C1/015B01D21/01
Inventor 刘书强张涛
Owner TIANJIN MEDIA IMAGING MATERIALS
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