Production method of superfine calcium carbonate special for high-gloss BOPP biaxially-oriented film

Abstract

A production method of superfine calcium carbonate special for high-gloss BOPP biaxially-oriented film. The method comprises the steps of conducting secondary whirlwind classification on high-qualityraw calcite after conducting crushing, dispersion adding and vertical rolling grinding on the high-quality raw calcite to obtain superfine calcium carbonate; then producing slurry with solid content of 30-50% from the superfine calcium carbonate and water, and adding a barium chloride solution and a sodium sulfate solution into the slurry dropwise at the same time for liquid-phase deposition and coating; and conducting surface modification treatment, screening and packaging on the slurry through a compound modifier after drying the slurry to produce the superfine calcium carbonate special forthe high-gloss BOPP biaxially-oriented film. By means of the production method of the superfine calcium carbonate special for the high-gloss BOPP biaxially-oriented film, the defects that the surfaceof traditional active ground calcium carbonate is unevenly coated, and the dispersity is poor are overcome, and in the production method of the superfine calcium carbonate special for the high-gloss BOPP biaxially-oriented film, a water-soluble amphiphilic activating agent is adopted for surface coating treatment so that completion of calcium carbonate particle surface coating can be achieved, andthe dispersity of the superfine calcium carbonate is improved.

Description

technical field [0001] The invention relates to a preparation method of superfine calcium carbonate specially used for high-gloss BOPP biaxially stretched films, belonging to the technical field of fine chemicals. Background technique [0002] BOPP is the abbreviation of "BiaxiallyOriented Polypropylene", and BOPP film is a biaxially oriented polypropylene film. The production of BOPP film is to first make the melt of high molecular weight polypropylene through a narrow and long die into a sheet or a thick film, and then in a special stretching machine, at a certain temperature and a set speed, simultaneously or step by step A film made by stretching in two vertical directions (longitudinal and transverse) and undergoing appropriate cooling or heat treatment or special processing (such as corona, coating, etc.). BOPP film is colorless, odorless, tasteless and non-toxic, with high tensile strength, impact strength, rigidity, toughness and good transparency. [0003] The tra...

AI Technical Summary

Problems solved by technology

In order to improve the surface gloss of the film, organic additives such as brighteners are often added to the formulation system, but this method of improving the brightness is expensive and easy to cause precipitation

[0005] When active ground calcium carbonate is used to produce BOPP biaxially stretched film masterbatch, since the active ground calcium carbonate used has the defect of uneven surface coating, a lubricant needs to be added to the formula system, in order to improve its compatibility with organic The binding force of polymers often requires the addition of coupling agents, and the small molecules produced by thermal decomposition of lubricants and coupling agents during high-temperature processing volatilize in the air, and the smell is very unpleasant, which does not meet the current cleaning requirements. The environmental protection concept of production also affects the physical and mental health of operators

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