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Water-soluble color stabilizer for color photographic paper and preparation method thereof

An organic solvent, independent technology, applied in the field of water-soluble color stabilizer for color photographic paper and its preparation, which can solve the problems of fading, discoloration, color photo fading and the like

Pending Publication Date: 2021-04-27
乐凯化学材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

First of all, after color images such as color photographic paper are exposed to high temperature, sunlight, and ultraviolet rays, the colored parts of the screen will fade. Secondly, some color photos will not only fade, but also partially change color.

Method used

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  • Water-soluble color stabilizer for color photographic paper and preparation method thereof
  • Water-soluble color stabilizer for color photographic paper and preparation method thereof
  • Water-soluble color stabilizer for color photographic paper and preparation method thereof

Examples

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preparation example Construction

[0103] The invention discloses a preparation method of a water-soluble color stabilizer for color photographic paper, which comprises the following steps:

[0104] (1) Add a certain amount of solvent into the reaction vessel, and add a certain amount of maleic anhydride under stirring. After heating to 60°C-80°C, add the initiator. (2) After the temperature stabilized, start to drop the solution containing mixed monomers of styrene and α-methylstyrene. The dropping time is 1h-4h, and the temperature is controlled at 65°C-80°C; then keep it for 2h-8h. (3) After the reaction is completed, the solvent is distilled under reduced pressure. After the distillation is complete, add deionized water and an inorganic base, stir to dissolve and adjust the pH to 6-9. Filter to obtain a light yellow transparent liquid product. The method has simple synthesis process steps, is suitable for water-soluble colored paper emulsion, has good compatibility with the emulsion, is pollution-free, ...

Embodiment 1

[0135] In a 250mL flask, add 80.0mL of ethyl acetate, add 4.0g of maleic anhydride while stirring, heat in a water bath to 65°C, add 0.3g of benzoyl peroxide, when the temperature is stable at 65°C--70°C, start to drop A mixed monomer solution (2.3 mL of styrene, 15.6 mL of α-methylstyrene dissolved in 20.0 mL of ethyl acetate) was added. The dropping time is 2 hours, and the temperature is stable at 65°C--70°C. Then keep warm for 8 hours.

[0136] After that, ethyl acetate was distilled under reduced pressure and evaporated; 80.0 mL of deionized water and 25% ammonia water were added to adjust the pH to 6.5--7, stirred and dissolved, and filtered to obtain a color stabilizer, which weighed 105.5 g.

[0137] Product molecular weight: 3580; product appearance: light yellow transparent liquid; solid content 19.5%. Magenta dye image density drop rate from 85% to 10.5%.

Embodiment 2

[0139] In a 250mL flask, add 80.0mL of methyl ethyl ketone, add 4.0g of maleic anhydride while stirring, heat in a water bath to 65°C, add 0.3g of benzoyl peroxide, when the temperature is stable at 65°C--70°C, The dropwise addition of the mixed monomer solution (2.3 mL styrene, 15.6 mL α-methylstyrene dissolved in 20.0 mL methyl ethyl ketone) was started. The dropping time is 2 hours, and the temperature is stable at 65°C--70°C. Then keep warm for 8 hours.

[0140] Afterwards, methyl ethyl ketone was distilled under reduced pressure, and evaporated; 80.0 mL of deionized water and 25% ammonia water were added to adjust the pH=6.5--7, stirred and dissolved, and filtered to obtain a color stabilizer, weighing 105.5 g.

[0141] Product molecular weight: 3720; product appearance: light yellow transparent liquid; solid content 19.5%. The magenta dye image density drop rate was reduced from 85% to 10.2%.

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Abstract

The invention relates to a water-soluble color stabilizer for color photographic paper and a preparation method of the water-soluble color stabilizer, and particularly provides a copolymer, the copolymer has a structure shown in a formula (I), and m is an integer between 1 and 5; n is an integer ranging from 3 to 25; l is an integer between 3 and 30; x is 1, 2, 3, 4 or 5; y is 1, 2, 3, 4 or 5; each R1 is independently H, D, F, Cl, Br, I, OH, NO2, CN or C1-6 alkyl; each R2 is independently H, D, F, Cl, Br, I, OH, NO2, CN or C1-6 alkyl; wherein the molecular weight of the copolymer is 2000 to 6000. The copolymer has good water solubility, can be well applied to a water-soluble emulsion, and is environment-friendly and pollution-free; when the copolymer is used as a color stabilizer, the magenta dye image density fading rate in the color photographic paper is low, the color stabilizing effect is good, and the magenta dye image density reduction rate can be reduced to be within 11% from 85%.

Description

technical field [0001] The invention relates to the field of photosensitive materials, in particular to a water-soluble color stabilizer for color photographic paper and a preparation method thereof. Background technique [0002] Parts of a brightly colored photo will often fade or change color over time. This is because the dyes on the color photos are composed of three different colors of dyes-yellow, magenta, and cyan. Most of the dyes are organic molecules with complex structures, which are more active than some ordinary pigments. First of all, color images such as color photo paper will fade after high temperature, sunlight, ultraviolet radiation, etc.; second, some color photos will not only fade, but also partially change color. For example, the leaves that were originally green in the photo gradually turned cyan or blue over time. This color change is called color cast. The reason for the color cast is that the light fading rates of the three dyes added are differ...

Claims

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Application Information

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IPC IPC(8): C08F222/08C08F212/08C08F212/12D21H21/14D21H19/20
CPCC08F222/08D21H21/14D21H19/20C08F212/08C08F212/12
Inventor 胡占宗
Owner 乐凯化学材料有限公司
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