Heavy calcium carbonate modifier and modification method thereof

Abstract

The invention relates to a heavy calcium carbonate modifier and a modification method thereof, wherein the heavy calcium carbonate modifier comprises at least one of fatty alcohol-polyoxyethylene ether, fatty acid polyoxyethylene ether and fatty alcohol alkyl phosphate. According to the modifier, adsorption and organic coating of part of polar groups on the surface of heavy calcium carbonate powder can be realized by utilizing various groups on the surface of the modifier, and the oil absorption value and the surface polarity of heavy calcium carbonate are remarkably reduced, so that the compatibility, the dispersity and the stability of the heavy calcium carbonate powder in an organic matrix are effectively improved.

Description

technical field [0001] The invention relates to the field of inorganic powder surface modification and calcium carbonate, in particular to a heavy calcium carbonate modifier and a modification method thereof. Background technique [0002] Ground calcium carbonate is widely used in the fields of organic / inorganic composite materials such as plastics, rubber products, artificial marble, and functional chemical fibers due to its low price, white color, rich resources, and good comprehensive performance. It is the largest non-metallic mineral filler in the world. . [0003] However, unmodified heavy calcium carbonate is difficult to disperse in plastic and rubber matrices, has poor interfacial compatibility and weak binding force, and can only play the role of increment and filling, and it is difficult to achieve the effect of strengthening or toughening; and it cannot Filling with a high amount of addition cannot meet the needs of organic composite materials with a high fillin...

AI Technical Summary

Problems solved by technology

Chinese patent CN105566951A discloses that stearic acid and aluminate coupling agent are mixed to modify heavy calcium carbonate, and then used in wire and cable products. It can be found that wire and cable toughness, brightness, plastic thermal hysteresis and bending strength Increase; Chinese patent CN106893273A discloses that titanate coupling agent, aluminate coupling agent and the coupling agent compounded by the two are used for the modification of heavy calcium carbonate, and are used for the production of plastic bags, and the resulting product has low specific gravity , environmental protection, low cost, etc.; Chinese patent CN105330561A discloses a surface modifier and its modification method for heavy calcium carbonate, but the required filling amount of the modifier is higher (1-15%); Chinese patent CN201110387649.X discloses a surface modifier formula for reducing the oil absorption value of calcium carbonate, which is to compound three surface modifiers of polyethylene glycol, triethanolamine and amino silicone oil

Although the above-mentioned related reports have made great progress in the surface modification of heavy calcium carbonate, the reduction of oil absorption value is generally limited. Therefore, in enhancing the compatibility with the organic matrix, increasing the loading of heavy calcium carbonate powder and There is still a lot of room for improving various performance indicators of composite materials such as plastics, rubber, and unsaturated resins

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