Technology for preparing wallpaper base layer from modified calcium carbonate as filler

Abstract

The invention belongs to the technical field of papermaking and provides a technology for preparing a wallpaper base layer from modified calcium carbonate as filler. The technology comprises steps asfollows: (1), wood pulp is soaked in water at the temperature of 90-95 DEG C for 1.5-3 h and then is subjected to beating, and paper pulp subjected to beating is obtained; (2), modified calcium carbonate as the filler is added to the paper pulp subjected to beating and is stirred uniformly, and mixed pulp is obtained; (3), a coupling agent, a sizing agent and a hardening agent are added to the mixed pulp, water is added for dilution, the components are mixed and stirred for 30-45 min, and wallpaper base layer pulp is obtained; (4), the wallpaper base layer pulp is added to pulp molding equipment for compression molding, the upper mold temperature is 70-85 DEG C, the lower mold temperature is 60-75 DEG C, mold pressure is 1250-1300 Mpa, mold-closing pressure maintaining is performed for 20-45 s, and the wallpaper base layer is obtained. The preparation technology is simple, the prepared wallpaper base layer is not prone to deformation, corrosion can be avoided, and the service life is longer.

Description

technical field [0001] The invention belongs to the technical field of papermaking, and in particular relates to a process for preparing a wallpaper base layer by using modified calcium carbonate as a filler. Background technique [0002] Wallpaper is a special paper used to decorate walls. There are many types of wallpaper, such as coated wallpaper, film-coated wallpaper, embossed wallpaper, etc. Usually, the base paper produced by bleached chemical wood pulp is used as the base layer. After processing in different processes, such as coated Cloth, printing, embossing or plastic-coated surface, finally cut and packaged before leaving the factory, because it has a certain strength, beautiful appearance and good water resistance, it is widely used in residential, office, hotel interior decoration, etc. [0003] In order to improve the quality of the existing wallpaper base formula, some flame retardants or heat stabilizers are added, and the product has the problem of unstable...

AI Technical Summary

Problems solved by technology

[0003] In order to improve the quality of the existing wallpaper base formula, some flame retardants or heat stabilizers are added. When molding, the quality of the products is unstable.

At the same time, as the number of times of wallpaper increases, the shrinkage and deformation of the later products will become larger, and the wallpaper will become wet when it meets water, and the base layer of the wallpaper will be easily corroded. The overall quality of the wallpaper is deteriorated, thereby reducing the service life of the wallpaper, which shows that in order to further improve the surface quality of the wallpaper base layer and improve the service life of the wallpaper, filling the modified wallpaper base layer with inorganic fillers has become an effective choice.

[0004] In the paper industry, calcium carbonate is used as a filler for paper products, which can improve the heat resistance, wear resistance, dimensional stability, rigidity and processability of paper, and reduce the cost of paper, but its surface has strong hydrophilic properties. Hydroxyl, showing strong alkalinity, this hydrophilic and oleophobic property makes the hydrophilicity of calcium carbonate and organic polymers poor, and it is easy to form aggregates, resulting in uneven dispersion inside the polymer, resulting in two materials The direct application effect is not good, and calcium carbonate is used as a filler, its acid resistance, corrosion resistance and other properties need to be further improved