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

Active Publication Date: 2021-07-06
广东新兴铸管有限公司
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  • Abstract
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Problems solved by technology

As we all know, diatomaceous earth is a water-resistant powder commonly used in casting coatings. It is mainly composed of the skeleton remains of a single-celled aquatic algae plant. It has high porosity, strong adsorption, small bulk density, high melting point, heat insulation, and absorption. Acoustic, low refractive index, stable chemical properties, etc., belong to non-renewable resources, and the cost is high

Method used

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  • Large-diameter nodular cast iron pipe die coating and preparation method and application thereof
  • Large-diameter nodular cast iron pipe die coating and preparation method and application thereof
  • Large-diameter nodular cast iron pipe die coating and preparation method and application thereof

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specific Embodiment

[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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Abstract

A water-based centrifugal casting pipe die coating for large-diameter nodular cast iron is prepared by selecting a plurality of perlite and diatomite with different particle sizes as mixed refractory aggregates, matching the mixed refractory aggregates with a composite suspending agent consisting of sodium bentonite and / or lithium bentonite and carboxylated rectorite, and adding hollow microspheres and a common binder; and the coating has excellent suspension stability and high-temperature crack resistance as well as low gas-forming property, permeability and hygroscopicity. Meanwhile, a specific spraying process is adjusted and optimized, the surface of a pipe die is coated with the large-diameter nodular cast iron pipe die coating, the surface of a large-diameter nodular cast iron pipe obtained after the centrifugal casting is free of surface defects such as air holes, burnt-on sand and shrinkage cavities, and the surface quality is excellent.

Description

technical field [0001] The invention belongs to the technical field of refractory coatings, in particular to a large-diameter ductile iron pipe mold coating and a preparation method and application thereof. Background technique [0002] Centrifugal casting is a casting method of pouring and forming under a centrifugal force field, and is the main method for the production of large-diameter ductile iron pipe fittings. Among them, the pipe mold is a mold that works in a hot state in centrifugal casting. It is subjected to sharp thermal alternating loads in continuous production. When the accumulation of residual stress exceeds the ultimate strength of the material, a thermal crack grid will be generated. scrapped. Pipe molds are expensive. In order to reduce production costs, improve pipe mold production conditions, and prolong pipe mold life, there are currently two effective ways to protect pipe molds: coating casting paint and cloth resin sand. Due to the poor surface qua...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22C3/00B22D13/02
CPCB22C3/00B22D13/02
Inventor 暴延强梅燕娜王世锋杨京龙孔少华宋斌林雪川赵文亮董小宏于礼勇张胜平
Owner 广东新兴铸管有限公司
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