A kind of halogen-free black sand and preparation method thereof

Abstract

The invention provides halogen-free black sand and a preparation method thereof. The halogen-free black sand is prepared from the following ingredients in percentage by weight: 30 to 50 percent of carbon black, 5 to 15 percent of lignite wax, 25 to 40 percent of diatomite, 5 to 10 percent of epoxidized soybean oil, 3 to 7 percent of fatty alcohol-polyoxyethylene ether, 3 to 5 percent of ammonium polyphosphate, 2 to 5 percent of fatty acid calcium salt, 0.1 to 0.5 percent of inorganic salt copper sulfate and 3 to 5 percent of coupling agents. A preparation process comprises the following stepsof sequentially adding formula raw materials into an internal mixer to be mixed for 20 minutes; obtaining a pre-finished product after the heating and grinding; transferring the pre-finished product into a butterfly type low-speed stirring machine for shearing and shaping the pre-finished product; obtaining a particular primary finished product of the black sand; filtering the particular primary finished product of the black sand to obtain a finished product. The black slurry produced by the method has the advantages of color spreading performance, high coloring capability and good flowability; the blackness degree and the brightness degree of the plastic products can be enhanced; a halogen-free and environment-friendly formula is used; phenomena of color spots, poor color vein dispersionand the like cannot occur; in the processing process, the mixing is firstly performed, and then, the grinding is repeatedly performed for three times, so that the carbon black, plasticizers and the like are uniformly scattered; the obtained black sand has the uniformly scattered color and luster and pigment figure.

Description

technical field

[0001] The invention relates to the technical field of pigment dyes, in particular to a halogen-free black sand and a preparation method thereof. Background technique

[0002] In the process of PVC plastic processing, in order to improve the stability, solid content, color, etc. of the plastic, it is necessary to add some additives in the molding process to change the performance of the plastic. Colored sand is usually composed of colorant, carrier, dispersant and other additives. When processing, a small amount of colored sand is mixed with colored resin to design products with different colors and properties. The use of colored sand can avoid problems caused by weighing accuracy, uneven mixing, and dust pollution when adding colored pigments.

[0003] Carbon black is widely used in plastics due to its excellent colorability and heat resistance, as well as its excellent chemical stability. Black sand is a post-processed product of carbon black. Because bla...