Calcium powder activation treatment function use

In order to uniformly disperse the calcium powder in the plastic to optimize the performance, the calcium powder must be surface-activated. According to the molding process and performance requirements of the final plastic product, the heavy calcium powder of a certain particle size is selected, and the auxiliary agent such as a coupling agent, a dispersing agent and a lubricant is first activated, and then a certain amount of the carrier resin is uniformly mixed, and then used. The twin-screw extruder is extruded and granulated to obtain a calcium carbonate film master batch.

   In general, the content of calcium carbonate in the master batch is 80% by weight, the total content of various additives is about 5 wt%, and the carrier resin is 15 wt%. The addition of heavy calcium powder can greatly reduce the cost of plastics. The storage of heavy calcium powder is extremely rich, and the preparation is very simple, so the price is very cheap. Such as the current use of plastic fillers in several kinds of calcium carbonate (special white heavy calcium carbonate whiteness 95 with calcium 99) price 325 ~ 400 mesh 120 yuan) - (600 mesh 280 yuan) - (800 mesh 320 yuan )-(1250 mesh 650 yuan) / t, factory delivery. After the surface activation treatment, the price is also around 2,000 yuan / t. Plastic particles (polyethylene) are relatively expensive. In terms of special materials for pipes, the prices of domestic and foreign polyethylene (carbon black) are above 9,000 yuan / t. The price difference between the two is very large. The more the heavy calcium powder is added to the plastic, the lower the cost.

   Of course, heavy calcium powder cannot be added indefinitely. Considering the toughness of plastic products, the filling amount of calcium carbonate is generally controlled within 50% by weight (data provided by heavy calcium powder filler manufacturers). For the production of plastic and steel-plastic composite pipes, plastics are their main raw materials, greatly reducing the cost of plastics is undoubtedly greatly reducing the production costs, which is beneficial to the improvement of profits. Calcium carbonate can play a skeleton role in plastic products, and has a great effect on the dimensional stability of plastic products. It can also improve the hardness of the products and improve the surface gloss and surface flatness of the products. Due to the whiteness of heavy calcium powder Above 90, it is also possible to replace expensive white pigments.

   The spectrally selective coating is based on acrylate copolymer or silicone acrylate copolymer, with titanium dioxide, heavy calcium powder, wollastonite and talc as fillers, and hollow microspheres with preservatives and emulsifiers. And defoamer and other auxiliary materials, developed a coating with a reflectivity of 0.2-2.8 micron and an emissivity of more than 80% in the range of 8 - 13.5 micron. The coating can directly lead the space to cool the surface of the coated object and With thermal insulation. The spectrum selective coating preparation process is simple, the cost is low, and the radiation cooling effect is good. The formulated latex paint not only has coating hardness, weather resistance, water resistance, scrub resistance, high temperature resistance, freeze-thaw resistance, etc., but also reduces the amount of film-forming materials such as titanium dioxide and lithopone. Production costs are 30 to 40.