White master batch as well as preparation method and application thereof

Abstract

The invention discloses white master batch as well as a preparation method and application thereof. The white master batch comprises titanium dioxide, carrier resin, fluorine-containing elastomer, low-density polyethylene and high-density polyethylene. Therefore, when the white master batch is applied to the color photographic paper, the appearance requirement of the color photographic paper in a production mode taking 1.25 m * 4000 m as a unit can be met, meanwhile, the physical and chemical performance requirements of an emulsion layer of the color photographic paper on a photographic paper plastic layer can be met, and the white master batch has high covering rate and excellent hue uniformity performance.

Description

technical field [0001] The invention belongs to the technical field of color masterbatches, and in particular relates to a white masterbatch and its preparation method and application. Background technique [0002] Color photographic paper is a photographic plastic-coated paper base after plastic-coating on the basis of photographic base paper, and then coated with a photographic paper emulsion on the photographic plastic-coated paper base to form a color photographic paper, and the color photographic paper becomes a photograph after development and processing. . As an important part of color photographic paper, the base of photographic plastic-coated paper has unique performance requirements. For example, the apparent requirement for "ideas" is that >0.5mm is not allowed to appear, and the number of ideas less than 0.5mm and greater than 0.2mm cannot exceed 2 per square meter. Another example is that the apparent hue fluctuation is not allowed to exceed 5%, and the pla...

AI Technical Summary

Problems solved by technology

[0020] Based on the above-mentioned mechanism analysis of the method mentioned in the patent CN102924780, it can be predicted that the method cannot obtain a better pre-dispersion effect of the pigment in the banburying stage, and must rely on the three-roller grinding in the second stage for forced dispersion. It is almost impossible to achieve the "absence of toner agglomerates" claimed by the invention

According to the claims and examples of the invention, it is found that the invention either uses zinc stearate with a content of 0.3% to 0.8%, or a pigment with good affinity, and titanium dioxide, which is conventionally used in white mother Said that using the inventive technology without the addition of zinc stearate could not obtain a white masterbatch "without toner agglomerates", while using the technology with the addition of zinc stearate would have a negative effect on the emulsion of photographic paper layers, making it unusable on photographic plastic-coated paper bases

[0021] And as mentioned in CN1222566C, adding polyethylene wax to obtain the color masterbatch with excellent dispersibility, but for the plastic-coated paper base of color photographic paper, in order to ensure the reliability of color photographic paper in the flushing process, it must be greater than The coating is carried out at 300 degrees Celsius, and polyethylene wax is easily broken and carbonized at this temperature. At the same time, the small molecular substances generated by the breakage will free to the plastic-coated surface at this time and affect the emulsion layer of the photograph, destroying the emulsion. The photosensitive performance of the layer, so that qualified photographic paper cannot be obtained

At the same time, because this process means uses low-molecular wax to wet and coat the toner, and then mix it with the resin after fully wetting, there are several deficiencies in this process: first, the implementation of this process is generally Using wax to wet the toner, its dispersing effect cannot meet the requirements. However, using low-molecular-weight wax to wet the toner has the problem of insufficient wetting and uneven wetting, and there will still be small toner agglomerations after wetting As a result, it cannot be dispersed in the subsequent process of mixing with the resin; second, the process has many steps, and the process is long and complicated, which makes it difficult to control the product quality during the production process; third, there are Due to the difference in molecular structure, some toners have insufficient affinity with the wax surface, so they cannot be fully wetted in this process, and it is difficult to effectively disperse. The hue of the toner, resulting in a decline in product quality

In addition, the use of wax will increase the production cost

The color masterbatch manufactured by the above-mentioned process means is easy to precipitate low-molecular wax during application, causing die deposits and affecting the quality of the product. Therefore, due to the existence of wax, the color masterbatch cannot meet the requirements of high-temperature coating or casting processes. thus limiting the application of the product

However, when the white masterbatch prepared by the above-mentioned technology and method is directly applied to the plastic-coated paper base for color photographic paper, the pigment agglomeration point of the white masterbatch will inevitably appear.

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