Nanometer calcium carbonate-polyvinyl chloride composite resin preparation method

Abstract

The invention discloses a nanometer calcium carbonate-polyvinyl chloride composite resin preparation method, wherein a liquid-phase blending method is adopted to mix a polyvinyl chloride slurry and a nanometer calcium carbonate emulsion in a slurry tank, and dewatering drying is performed to obtain the nanometer calcium carbonate-polyvinyl chloride composite resin. According to the method of the present invention, the characteristics of lipophilicity of the modified nanometer calcium carbonate, no pore residue on the skin and in the internal of the desorbed polyvinyl chloride, and the like are utilized, and the nanometer calcium carbonate and the polyvinyl chloride resin particles form the uniformly-dispersed stable composite resin through the organic terminal molecule chain winding and the physical adsorption, such that the negative influence of the processing aid during the plastic product production on the dispersion and molecule chain winding effect between the nanometer calcium carbonate and the polyvinyl chloride molecules is avoided, and the mechanical properties of the polyvinyl chloride materials are improved; compared with the in-situ polymerization method and the melt blending method, the method of the preparation method has advantages of simple operation, no solid dust pollution, cleaning and the like; and the drying and grinding step in the nanometer calcium carbonate production can be eliminated so as to substantially reduce the equipment cost and the production cost.

Description

technical field [0001] The invention belongs to the field of polymer materials, and relates to a blending method of modified nano calcium carbonate and polyvinyl chloride resin, in particular to a preparation method of nano calcium carbonate-polyvinyl chloride composite resin. Background technique [0002] With the rapid development of the construction industry, chemical building materials such as polyvinyl chloride profiles and pipes have been widely used, which puts forward higher requirements for their performance. In order to improve and enhance the impact resistance of polyvinyl chloride and further broaden its application fields, nano-fillers (nano-calcium carbonate, etc.) are generally used to modify polyvinyl chloride to improve its performance. In terms of nano-filler modified polyvinyl chloride, it mainly focuses on melt blending modification and in-situ polymerization modification. Simple and favored by manufacturers. However, the melt blending modification requ...

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Problems solved by technology

[0004] The purpose of the present invention is to solve the complex process control of nano-calcium carbonate in-situ polymerization modified polyvinyl chloride, the uneven dispersion of nano-calcium carbonate melt-blended modified polyvinyl chloride, resulting in agglomeration affecting product performance, etc., using liquid phase (deionized water) ) blending method, the polyvinyl chloride slurry is mixed with the modified nano-calcium carbonate emulsion in the slurry tank, and the lipophilicity of the modified nano-calcium carbonate can be entangled with the polyvinyl chloride resin particles through the organic terminal molecular chain and Physical adsorption forms a uniformly dispersed and stable form, and obtains nano calcium carbonate-polyvinyl chloride composite resin after dehydration and drying

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