Large-diameter nodular cast iron pipe die coating and preparation method and application thereof
A nodular cast iron pipe and large-diameter technology, which is applied to casting molding equipment, coatings, casting molds, etc., can solve the problems of small bulk density, low refractive index, and high cost
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[0045] 1. Preparation of large diameter ductile iron pipe mold coating
[0046] The present invention provides a kind of preparation method of large diameter ductile iron pipe mold coating, comprises the following steps:
[0047] (1) Preparation of composite suspending agent
[0048] 1. In parts by weight, weigh 100 parts of rectorite and add it to 1000 parts of water, stir evenly, add 6 parts of amino-containing silane compound (KH550) after heating up to 80°C, react for 12 hours, and filter to obtain amino-modified retort stone;
[0049] 2. Add the amino-modified rectorite and succinic anhydride obtained in step 1 into the solvent according to the molar ratio of carboxyl and amino groups of 1:1, adjust the pH value to 4.0 and react for 6 hours, then filter and dry to prepare carboxylated rectorite ;
[0050] 3. The carboxylated rectorite obtained in step 2 is mixed with sodium bentonite and / or lithium bentonite according to the formulation amount in Table 1 to prepare a c...
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