Calcium carbonate can not only reduce the raw material cost of plastic products, but also improve some properties of plastic materials, for example, the color of PP woven bags changes from translucent to white and the increase of surface polarity is beneficial to printing.
The research in recent years has achieved gratifying results. The research results of many colleges and universities and research institutes have shown that when calcium carbonate with a certain fineness is used properly, the impact resistance of the matrix plastic can be significantly improved, that is, calcium carbonate can be used. Used as an impact modifier for plastic materials.
1.1 Special materials for synthetic paper
Synthetic paper is also called plastic film paper, polymer paper, stone paper, etc. This kind of paper has high tensile strength, is not afraid of water, is not moth-eaten, is elastic, can be heat-insulated, has stable dimensions, and has a smooth surface. It is suitable for books and periodicals and printing. It is mostly used to make fishery paper, aviation and navigation charts, punched cards, water-resistant newspapers, record envelopes, commodity labels, outdoor advertisements, business cards and other special papers.
Synthetic paper is a new type of plastic material product. It is a multi-functional material with the characteristics of plastic and paper. It is also an environmentally friendly product with moderate specific gravity, high strength, tear resistance, good printability, shading, UV resistance, and durability. Durable, economical and environmentally friendly. Since the production process of synthetic paper is non-polluting, it can be 100% recycled and recycled, which is a major reform of modern paper production.
At present, the world sales of synthetic paper products are increasing at a rate of 10% every year, and the pace of partial replacement of ordinary fiber paper by synthetic paper is accelerating.
1.2 Antibacterial and weather-resistant multifunctional enhanced color masterbatch for injection molding plastic trash can
Plastic garbage bins are a good tool for garbage shipment during the centralized treatment of medical waste. Among them, there are low-cost trash bins with functions such as antibacterial and sterilizing, weather resistance, ultraviolet resistance, high and low temperature resistance, etc., especially green ones in the sanitation department.
The performance of ordinary plastics cannot meet the above requirements, which requires modification of ordinary HDPE injection molding materials. The first is the whole material making method, that is, according to the formula, modifiers, plastic resins, processing aids, etc. are mixed and extruded together to make materials for modified plastics; then they are directly sent to plastic processing machinery to be processed into required plastics products. The second is the masterbatch method, that is, the partial material making method, that is, according to the formula, the modifier, a small amount of plastic resin, processing aids, etc. are mixed and extruded together to form a modified plastic master batch; Proportion Mix the masterbatch and plastic resin evenly and send it to the plastic processing machinery to process it into the required plastic products. The advantages are: user-friendly, simple operation, simplified production process, good mixing effect, green and environmental protection, which is conducive to improving production efficiency and product performance indicators and reducing costs.
As early as the second half of the last century, in order to reduce the cost of plastic products and improve certain properties, some plastic products at home and abroad have more or less added non-metallic inorganic powders, such as calcium carbonate.
To solve the problem of increasing the specific gravity of plastic products due to the addition of fillers, there are two ways: one is to find non-metallic materials with a specific gravity close to 1g/cm3 or even less than 1g/cm3. Unfortunately, such a material has not been found in nature. A non-metallic mineral product with a cheap specific gravity close to 1 g/cm3.
The second method is to take various measures to make the specific gravity ratio of the whole plastic product after adding the filler. Adding calcium carbonate that has not been taken will cause the specific gravity of the plastic product to decrease, while other physical and mechanical properties will not decrease. , which also achieves the effect of reducing the weight of calcium carbonate powder.