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Precoated sand lubricant and preparation method thereof

A technology of lubricant and coated sand, which is applied in the field of lubricants to achieve the effects of good demoulding effect, not easy to agglomerate, and improved fineness

Inactive Publication Date: 2019-01-04
NANTONG XINBANG CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention is that, aiming at the problems caused by the lubricant used in the process of preparing coated sand in the prior art, the present invention provides a lubricant for coated sand and its preparation method

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0018] Add 3,000 parts of water, 500 parts of stearic acid, 37.5 parts of calcium hydroxide, 150 parts of barium hydroxide octahydrate into the stirred reactor, mix and stir, heat up to 80-100°C, complete reaction, pressure filtration, drying temperature The temperature is 60-70°C, the drying time is 1-1.5h, and the finished coated sand lubricant is packaged, and the filtrate is returned to the reactor for use.

[0019] The coated sand lubricant performance that the present invention produces is as follows:

[0020] 1. The appearance is white or off-white fine powder, the pass rate of 500 mesh is 99%, and the particle size distribution is uniform.

[0021] 2. PH value (10% water dispersion) 8-10.

[0022] 3. The melting point reaches 160°C.

[0023] Apply this product to the typical formula of coated sand, 100 parts of raw sand, 10 parts of phenolic resin, 1 part of curing agent, 0.4 parts of aluminum hydroxide, 0.5 parts of graphite, 0.8 parts of lubricant, the fluidity of ...

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Abstract

The invention discloses a precoated sand lubricant and a preparation method thereof. The precoated sand lubricant consists of the following raw materials in parts by weight: 10-90 parts of calcium stearate and 10-90 parts of barium stearate. The lubricant disclosed by the invention has the characteristics that due to adoption of the barium stearate, the fineness of the product is increased, whichis up to about 500 meshes, and the melting point is up to 160 DEG C; while precoated sand is produced, the product can be directly added and used, the product can be well fused with the precoated sand, high adhesion is achieved, the precoated sand is not liable to cake and is good in flowability, the strength of the precoated sand is improved, the melting point and the flowability of the precoatedsand can be ensured under a condition of a relatively small addition amount, a good demolding effect is achieved, and a cast part is high in smoothness and precision. The method disclosed by the invention is safe and environmental-friendly, and free of process wastewater.

Description

technical field [0001] The invention relates to the field of lubricants, in particular to a lubricant for coated sand and a preparation method thereof. Background technique [0002] The surface of the sand grains of coated sand is covered with a layer of solid resin film or core sand before molding. There are two coating processes: cold method and hot method: the cold method dissolves the resin with ethanol, and adds urotropine during the sand mixing process, so that the two are coated on the surface of the sand grains, and the ethanol volatilizes to obtain coated sand; hot method Preheat the sand to a certain temperature, add resin to melt, stir to coat the resin on the surface of the sand, add urotropine aqueous solution and lubricant, cool, crush, and sieve to obtain coated sand. For steel castings and iron castings. [0003] The coated sand mainly uses high-quality selected natural quartz sand as raw sand, thermoplastic phenolic resin, urotropine and reinforcing agent ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22C1/02
CPCB22C1/02
Inventor 张杰顾建荣吕小波
Owner NANTONG XINBANG CHEM
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