SU1065818A1 - Hologran stabilization method - Google Patents

Abstract

1. A method for stabilizing a hologram on a halo-silver photographic material, including its processing in an aqueous solution of an acrylic monomer, characterized in that, in order to increase the stability of the photo layer thickness, with further contacting of the holo- gram with water solutions, its exploitation and storage, The hologram is treated for 2–10 minutes in a solution containing additionally an acrylic dimer and ammonium persulfate, and 1–5 minutes in an aqueous solution of tetramethylethylenediamine. OS) SP 00 00

Description

2 .. The method according to p. 1, characterized in that acrylamide or 2-dioxyethyl methacrylate is used as the acrylic monomer and as methylene bis-acrylamide or di-2-dioxyethyl methacrylate acrylic dimer with the mass ratio of ingredients of the treatment solution, wt.%:

Acrylamide or 2-dioxyethyl methacrylate 10-95

Methylene bis-acrylamide or DI-2-Dioxyethyl methacrylate Ammonium persulfate Water

3. The method according to claim 1, which is related to the fact that, tetramethylethylenediamine is used in a concentration of 0.30, 4 May,%.

The invention relates to holographic and can be used for the additional processing of gelatin halogen-silver photographic with a developed holographic image. The quality of a holographic image depends on the change in the thickness of the photo layer (its shrinkage) after chemical photographic processing that prevents the holographic image from being restored by light with wavelength. equal to the wavelength of the radiation used to record the holograms. The thickness of the photo layer also decreases as the relative humidity of the ambient air decreases during storage or operation of these holograms. Therefore, the thickness of the photo layer with a holographic image should remain equal to or close to the thickness of the emulsion layer at the time of exposure, both after chemical photographic processing and during further operation and storage. Maintaining the constancy of the thickness of a photoflora with a holographic image is especially important for volume and color holography. A known method of processing holograms is one in which a decrease in the photoflow after the chemical and photographic treatment is achieved by eliminating the fixing stage, which is one of the main causes of the shrinkage of the photofloor ij. A disadvantage of the known method is that unfixed photo layers cannot be stored in the light and the silver halide remaining in the layer scatters light, which reduces the image quality. There is also known a method of producing non-shrink holograms by heat treatment of the emulsion layers prior to exposure for 3 hours at 70 ° 2j. The HejE ocTatKOM of this method eliminates the fixing stage from the process of chemical-photographic processing, as well as the lack of constancy of the photo layer and, consequently, the wavelength of the restoring light when using materials with a holographic image at different ambient humidity. The closest to the proposed technical essence and the achieved effect is a method of processing holograms by impregnating a photo layer with a holographic image with an aqueous solution of vinyl pyrrolidone or acrylic acid and acrylamide, followed by polymerizing them into a photo layer under the action of UV radiation, combined with its sj drying. The disadvantage of this method is that the photo layer does not stabilize: when the air humidity changes, the degree of monomer polymerization does not allow subsequent processing of holograms with water or aqueous solutions (for example, for the restoration of damaged photos) due to leaching out of low molecular weight photo cells. polymer products tov. In this case, the thickness of the photo layer is reduced, and the color of the reconstructed image again becomes distorted. Due to the uneven polymerization of monomers in the thickness of the photoflow, the selectivity of the hologram deteriorates, which is of great importance for color holography. In addition, the method is not suitable for processing bleached holograms, in which the image consists of silver halide grains darkening under the action of UV light, which leads to a decrease in the brightness of the restored image from the hologram image. The purpose of the invention is to increase the stability of the thickness of the photo layer with further contact of the hologram with aqueous solutions, its operation and storage. This goal is achieved by the fact that, according to the method of stabilizing a hologram on halogen-silver photographic material, including its processing in an aqueous solution of an acrylic monomer, the hologram is processed for 2-10 minutes in a solution containing an additional dimer of acrylic row and ammonium persulfate, and 1-5 minutes in an aqueous solution of tetramethylethylenediamine. Acrylamide or 2-dioxyethyl methacrylate is used as the monomer of the acrylic range, and methylene bis-acrylamide or di-2-dioxyethyl methacrylate is used as the dimer of the acrylic range at a mass ratio of ingredients of the treating solution, wt.%: Acrylamide or 2-dioxyethyl methacrylate 10 -95 g of ethylene bis-acrylamide or di-2-dioxyethyl methyl ethyl 0, 4-1.2 Ammonium persulfate 0.1-0.2 Water Remaining Tetramethylethylenediamine is used in a concentration of 0.3-0.4 wt.%. The photo layer is impregnated with an aqueous solution of a mixture of monomer, dimer and oxide of the solvent for 2–10 min, then with an aqueous solution of a reducing agent for 1–5 min. The crosslinked polymer product formed inside the photo layer is washed out of the photo layer during subsequent washing with water only partially (due to the low molecular weight uncrosslinked fraction) and will allow the photo layer thickness to be restored to a value that gives the hologram light to the wavelength of the recording light. (for example 633 to them). FIG. Figure 1 shows the change in the wavelength of the reducing light on the relative humidity of the air; in fig. 2 - diffraction efficiency curves before and after processing holograms. Example 1. On plates with a halogen-sparing gelatinous layer (PE-2 emulsion) using a He-Ne laser (633 nm), the holotrame of the mirror and the object is recorded in colliding beams. Exposed plates are treated in a gp-2 developer for 20 min at 20, fixed, in acidic fixer, washed with running water for 15 min and dried in diluent of ethyl alcohol of concentration 50, 75 and 96%. Then the gums are sublimated in an aqueous solution of a triazine tanner to melting point 100 and dried. A 1% hologram is impregnated for 10 minutes with the composition of the composition, i composition,%: Acrylamide 10 Methylene bis-acrylamIxT0, 4 Ammonium persulfate 0.13 Water 89.47 Then for 2 min they are placed in 0.33% aqueous tetramethylethylenediamine, washed with water for 1 min and dried . The thickness of the layer is measured on a 2-01D profilograph-profilometer with a sensitivity of 0.1 µm, the wavelength of light restored by a hologram on an SF-3 spectrophotometer 8. To follow the storage and operation of holograms in various humidity conditions, holograms are kept in desiccators with relative humidity 0; ten; 20; 33; 43; 6.5; 80; 90% in 7 days, and the wavelength of the hologram-reconstructed light is measured on a spectrophotometer. AJ h assessing the possibility of subsequent processing of holograms in aqueous solutions, for example, in order to restore the damaged surface, the holograms are washed with flowing water for about JU min and the above parameters are again measured. Table 3 gives the measurement results}: l - all the examples given, where uhi and uh2 is the change in% of the photo layer thickness after polymerization of the monomer and dimer (dB;)) and after polymerization and washing (uh7) relative to the layer thickness after the chemical photographic processing. l 1 and d -2 is the change in nm ... the length of bojTH.Di of the restored golog of amma light after polymerization (bA) and after polymerization and washing (.La) in relation to the wavelength of the hologram-reconstructed light after chemical-photographic processing; —the change in nm of the wavelength of the hologram-reconstructed light as the relative humidity varies from 0 to 65%. Example2. On the plates of example 1, holograms of the mirror in the colliding beams are recorded with a He-Ne laser. Exposed plates are treated in developer L-19 for 5 minutes and fixed in acidic fixative, washed with running water for 15 minutes, bleached. In a bleach containing a mixture of potassium dichromate, copper sulfate, potassium bromide and sulfuric acid, and washed with running water for 20 min and dried in alcohol solutions with increasing alcohol concentration.

The subsequent processing of the finished holograms was carried out in the same solutions as in example 1.

Example 3. On the plates of Example 1, holograms of the mirror are recorded in the colliding beams with the aid of a He-Ne laser. The exposed plates are treated in a GP-2 developer for 20 minutes at 20, fixed in acidic fixer, washed with running water for 15 minutes and dried in alcohol solutions. Diffusion-hardened holo: grams are impregnated for 5 minutes in solution, composition,%:

Acrylamide 12.0

Methylene bis acrylamide .1,2

Ammonium persulfate 0.12 Water .86,68

Then for 2 minutes they are placed in a 0.4% aqueous solution of tetramethylethylenediamine. Holograms are dried at room temperature. Further processing and measurements were carried out as in Example 1.

Example 4. Holograms registered by He-Ne laser and printed in the GP-2 developer are duplicated as in Example 1.

The finished holograms are processed for 2 minutes in a solution of the composition,%:

2-Dioxyethyl methacrylate .95

Di-2-dioxyethylmethacrylate 1/2

Ammonium persulphate 0.2 Water 3.6

Example 5 The hologram l is treated analogously to example 4, but the duration of the impregnation of the hologram with a solution containing 2-dioxyethyl methacrylate is increased to 5 minutes. The test results are shown in the table and in the drawings (Fig. 1, curve 2 and Fig. 2, curves 4 and 5).

Example 6. Holograms are treated analogously to example 4, but the duration of treatment in a solution containing 2-dioxyethyl methacrylate is increased to 10 minutes. The test results are presented in the table and in the drawings (Fig. 1, curve 2 and Fig. 2, curves 4 and 5). Example 7. The holograms are treated analogously to example 4 in a solution of the composition,%: 2-Dioxyethylmethacrylate 56,5

DN-2-dioxyethylmethacrylate6, 8

Ammonium persulphate 0.3 Water 24.4

Pr and Mehr 8. Holograms are registered with He-Ne laser, pro- duced in the GP-2 developer, and set up as in Example 1.

 The finished holograms are processed for 10 minutes in a solution of the composition,%:

2-Dioxyethylmethacrylate91

Di-2-dioxyethylmethacrylate0.45

Ammonium persulphate 0.4

Water8 D 5

Example 9. Holograms are recorded and developed analogously to example 1. The finished holograms are treated in 85% aqueous solution of H-vinylpyrrolidone for 30 minutes, excess N-vinylpyrrolidone is removed with acetone and polymerized under UV light (incubated under a mercury lamp 125 W at a distance of 10 cm for 1 h). In this case, the polymerization of N-zinylpyrrolidone I in the photolayer is carried out simultaneously with its sUKO1.

Example 10. Holograms are recorded and developed in the same way as in Example 1. The finished holograms are treated in 40% aqueous acrylamide solution for 10 minutes, excess monomer is removed from the surface with acetone, and the holograms are polymerized under the UV lamp of 125 W for 1 h. The results of changing the thickness of the emulsion layer after polymerization of the monomer with UV light and after washing in water are shown in the table and on the drawings (Fig. 1, Curve 3 and Fig. 2, Curves b and 7).

The results obtained are presented in the table.

As can be seen from the results shown in the table and in the drawings, the processing of photographs with a holographic image by the proposed method leads to an increase in the thickness of the photocell and, accordingly, a change in the wavelength of the reducing light by 16-40 nm and after washing with water the change in the wavelength remains 5-25 nm while the processing by the method of the prototype after polymerization shifts the wave of light by 27 nm, and after the photoflow is washed with water, the wavelength of the reducing light becomes equal to the wavelength after the chemical photograph eskoy processing.

As can be seen from FIG. 1, the change in the wavelength of the reducing light with a change in humidity from 65 to 0% is equal to 70 g (curve 1), after polymerization with N-vinyl pyrrolidone in an emulsion layer of 35 nm (curve 3), the main changes occurring at humidity from 0 up to 40%

When processing by the proposed method (curve, 2), changes occur at humidity from 0 to 10% at 15 nm in the rest of the range, the thickness of the photos ;; remains unchanged. In addition, as follows from Fig. 2, the selectivity of the hologram in the case of processing by the proposed method does not change (curves 4 and 5 are identical), while the selectivity of the hologram processed by the method according to the prototype decreases (curves b and 7 do not. identical). The proposed method of stabilizing a hologram has the following advantages as compared with the base sample. When the hologram is maintained under different conditions of relative air humidity (If), varying from 0 to 65%, the wavelength of the reducing light changes only slightly at (0-10%, and at 1 p 10-80% is within 91 633 nm. The formation of an unbreakable cross-linked polymer fraction in the photolayer ensures a more stable recovery of the photolayer thickness and a shift in the wavelength, the wave of the reconstructed hologram of light to This, in turn, creates a stable image quality regardless of the subsequent water processing of holograms, I The proposed method is also suitable for stabilizing bleached holograms By maintaining the selectivity of holograms during processing by the proposed method, the quality of the image is improved. durability of volume and color holograms in conditions that do not require conditioned air with constant parameters relate flax moisture „

Claims (2)

1. METHOD FOR HOLOGRAM STABILIZATION on silver halide photographic material, including its processing in an aqueous solution of an acrylic monomer series, characterized in that, in order to increase the stability of the thickness of the photolayer upon further contact of the holo- gram with aqueous rattors, its operation and storage, the hologram in those - * for 2-10 minutes, it is treated in a solution containing an additional acrylic dimer and ammonium persulfate, and for 1-5 minutes in an aqueous solution of tetramethylethylenediamine. V / ty LLP - + S5 950 + 2 .. The method according to π. 1, characterized in that acrylamide or 2-dioxylethylmethacrylate is used as a monomer of the acrylic series, and methylene-bis-acrylamide or di-2-dioxylethylmethacrylate is used as a dimer of the acrylic series at a mass ratio of the ingredients of the processing solution, wt.%: Acrylamide or 2-Dioxyethyl methacrylate 10-95 Methylene bis acrylic 0.4-1.2 0.1-0.2 Rest amide or di-2-di hydroxyethyl methacrylate Ammonium persulfate Water ί 3. The method according to p. 1, ABOUT t whether tea with I by that tetramethylethylenediamine is- use at a concentration of 0.4 may,%. 0 3-