Coal tar pitch binding agent and preparation method thereof

Abstract

The invention provides a coal tar pitch binder and a preparation method thereof. The coal tar pitch binder is calculated in parts by weight, consisting of 100 parts of coal tar pitch, 10-30 parts of polyether polyol, 10-50 parts of unsaturated fatty acid, 10-30 parts of tackifying resin, 10-30 parts of solubilizer, 1-10 parts catalyst composition. The preparation method is to mix and heat coal tar pitch and solubilizer in a reaction kettle until the pitch is completely dissolved at 180°C, then add polyester polyol, unsaturated fatty acid, tackifying resin and catalyst in sequence, mix well and keep warm for 6 hours to obtain coal tar pitch asphalt binder. The coal tar pitch binder prepared by the invention has high coking value, low toxicity and low odor, and can significantly improve the high-temperature bonding strength of magnesia-carbon bricks.

Description

technical field [0001] The invention belongs to the technical field of modified coal tar pitch, in particular to a coal tar pitch binder with low toxicity and high coking value and a preparation method thereof. Background technique [0002] my country started to develop magnesia-carbon bricks in the early 1980s, and now it has become the world's largest producer of magnesia-carbon bricks. At present, the production of magnesia-carbon bricks in my country generally adopts the brick-making process of mixing, molding and baking at room temperature, which is mainly suitable for the production method using phenolic resin as a binder. In our country, magnesia carbon bricks bonded with phenolic resin with a carbon content of 12% to 20% are generally used. In European countries, asphalt-bonded magnesia-carbon bricks are mostly used, and the carbon content is generally about 10%. my country is rich in coal tar resources, with an annual output of 1.75 million tons, accounting for 10...

AI Technical Summary

Problems solved by technology

However, the binder essentially uses a small amount of coal tar pitch to modify the phenolic resin, and it is still the most widely used product of the phenolic resin series, so there are problems of toxicity and low high-temperature strength.

Patent ZL01107356.X introduces a binder suitable for a new type of anti-oxidation magnesia-carbon brick process. The composition includes: pitch, silica, aluminum oxide, anthracene oil, and other trace carbonizing element additives. Low, so that the oxidation resistance of magnesia-carbon bricks is good, but the patent does not propose a method to increase the coking value of coal tar pitch and reduce toxicity, that is, it does not propose a solution to the two key issues that affect the application of coal tar pitch