Powdery ardealite filler and preparation thereof

Abstract

The invention belongs to the field of PVC (Polyvinyl Chloride) production fillers, and particularly relates to powdery ardealite filler. The ardealite is subjected to temperature rise sintering until the surface temperature of the ardealite is 180-190DEG C, the ardealite is grinded until a grain diameter is 60-80mu m, and then, the ardealite is cooled to a room temperature to obtain beta-type hemihydrate gypsum; processing aid and dispersant are added, mixing at a high speed is performed for 5-8min, and the mixture is grinded into powder after the mixture is subjected to constant temperature curing for 30-60min to obtain the powdery ardealite filler. The filler has the advantages of good thermostability and proper foaming property. The method has the advantages of simple technology and low cost.

Description

technical field [0001] The invention belongs to the field of PVC production fillers, in particular to a powdery phosphogypsum filler and its preparation. Background technique [0002] Filling modification is one of the basic means of plastic modification, which refers to the addition of inorganic or organic fillers during the clinker molding process, so as to improve the processing performance or use performance of plastic materials, or reduce the cost of raw materials. In most cases, the cost of fillers directly affects the level of production costs; and with the continuous expansion of the application field of plastic materials, higher requirements are placed on the mechanical properties of materials, as well as the properties of light, electricity, magnetism, and flame retardancy. , the desired effect can be easily achieved through filling modification. [0003] my country's plastics industry started late, and calcium carbonate was often used as a filler to prepare polyv...

AI Technical Summary

Problems solved by technology

[0003] my country's plastics industry started relatively late. At first, calcium carbonate was often used as filler to prepare polyvinyl chloride plastics. However, the compatibility of inorganic fillers and polymer materials is very different, so the application of calcium carbonate in polyvinyl chloride plastics is limited.

Nowadays, in order to improve the dispersion of fillers, a large number of nano-scale fillers are pouring out, but due to the high cost and complicated process, so far, the plastic processing industry has not done a good job of using nano-scale fillers in terms of processing equipment, performance and price. Preparation of fillers; and some metal ions in fillers often interact directly or indirectly with organic resins to affect the internal structure of resins. For example, in polyethylene resins, metal ions such as iron and copper ions not only affect the color of the product, but also affect the color of the product during processing. When the resin is depolymerized, it will affect the thermal stability; further, in high temperature resistant plastics, when the filler containing aluminum ions is heated above 300°C, the water in the filler structure will be released, which will destroy the internal structure of the plastic.