High-permeability sand-burning-preventing paint for casting and preparation method thereof

A high-permeability, anti-sticking sand technology, which is applied to casting molding equipment, coatings, casting molds, etc., can solve the problems of inability to effectively fill the gap between sand grains, insufficient high-temperature strength of the coating, and easy sedimentation and agglomeration of the coating. problems, to achieve the effect of improving stability and brushability, ensuring hanging and coating strength, and preventing sticky sand defects

Inactive Publication Date: 2011-08-03
衡阳中钢衡重铸锻有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Practice has proved that the coating obtained by this patent application has low penetration to the sand mold and the high-temperature strength of the coating is not enough. The stability of the coating on steel parts under long-term high temperature environment is poor, the coating is easy to crack and fall off, and the molten steel is easy to break through the coating and penetrate into the sand mold
[0004] Chinese patent application (application number 200910046096.4) discloses a zircon powder alcohol-based coating for large castings, and the refractory aggregate is made of ZrO 2 More than 65% of zircon powder, the paint binder is combined with oxidized rosin resin and thermoplastic phenolic resin, and the weight ratios of the paint are: oxidized rosin resin 0.3-0.6%, thermoplastic phenolic resin 0.5-0.8%; this patent application Although it can form a dense film on the

Method used

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  • High-permeability sand-burning-preventing paint for casting and preparation method thereof
  • High-permeability sand-burning-preventing paint for casting and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Weigh 50 kg of zircon powder, 50 kg of chromite powder, 1.5 kg of phenolic resin, 0.1 kg of oxidized rosin, 0.4 kg of ethyl silicate, 0.03 kg of alkylphenol polyoxyethylene ether, 95 kg of ethanol, polyvinyl alcohol 0.2 kg of butyraldehyde, 3 kg of lithium-based bentonite, 0.05 kg of n-butanol; the particle size of zircon powder and chromite powder is 325-500 mesh, which can be purchased from the market with a particle size of 325-500 mesh, or through grinding 325-500 mesh.

[0036] First, make the lithium-based bentonite fully swell with an appropriate amount of water, and use part of ethanol (alcohol) to make a saturated solution of phenolic resin, oxidized rosin, and polyvinyl butyral respectively, and wait for use; when using (in order to achieve the best effect) , the rest of the ingredients are best prepared at the time of use), part of ethanol, phenolic resin solution, oxidized rosin solution, polyvinyl butyral solution, ethyl silicate, swollen lithium-based bent...

Embodiment 2-20

[0038] Embodiment 2-20 except that raw material composition and proportion are different from embodiment 1, its manufacturing process is the same as embodiment 1, and the raw material composition that all embodiment 1-20 adopts is shown in the following table 1.

[0039] The test characteristics of the high-permeability anti-sand sticking coatings for foundry obtained in Examples 1-20 are shown in Table 2 below.

[0040] Table 1

[0041]

[0042] Table 2

[0043]

[0044] During use, the thickness of 0-0.5mm before the molding sand coating, the particle size of the refractory aggregate used in the coating obtained by the present invention is 325-500 mesh zircon powder and chromite powder, and the refractory aggregate is more likely to penetrate into the pores of the sand mold, improving the Penetration properties of coatings, filling the gaps between sand grains, and preventing castings from sticking to sand; after the molding sand is coated with a thickness of 0.5-2....

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Abstract

The invention discloses high-permeability sand-burning-preventing paint for casting and a preparation method thereof. The high-permeability sand-burning-preventing paint is prepared from the following raw materials: refractory aggregate, a binding agent, an activating agent, a thickening agent, a suspending agent, a defoaming agent and a carrier, wherein the masses of the binding agent, the activating agent, the thickening agent, the suspending agent, the defoaming agent and the carrier respectively account for 0.5-2.5 percent, 0.01-0.05 percent, 0.1-0.5 percent, 1.5-5.0 percent, 0.01-0.1 percent and 40-220 percent of the mass of the refractory aggregate; the refractory aggregate is a mixture of one or two of zircon powder and chromite fines in any proportion; the binding agent is phenolic resin or a mixture of the phenolic resin and one or more than two of oxidized rosin and ethyl silicate; the activating agent is alkylphenol ethoxylates; the carrier is ethanol; the thickening agent is polyvinyl butyral; the suspending agent is lithium bentonite; and the defoaming agent is normal butanol.

Description

technical field [0001] The invention relates to a coating and a preparation method thereof, in particular to a high-permeability anti-stick sand coating for casting and a preparation method thereof. Background technique [0002] There are many types of casting coatings, which can be roughly divided into two categories: water-based coatings and organic solvent coatings. Among them, the organic solvent coating can be cured after being ignited after coating. It can be used in conjunction with various self-setting sand processes without drying, which can shorten the production cycle, simplify the process, save energy, and reduce the investment in drying equipment. It is widely used in the foundry industry. A widely used quick-drying coating has been widely used in the production of steel, iron and non-ferrous castings. However, the progress in the production and application of large, especially thick and large steel castings is slow, because the pouring temperature of thick and...

Claims

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Application Information

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IPC IPC(8): B22C3/00
Inventor 谈剑刘友成罗政清林正文杨斌
Owner 衡阳中钢衡重铸锻有限公司
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