Low-cost environment-friendly precoated sand and preparation method thereof

An environmentally friendly technology of coated sand, applied in casting molding equipment, casting molds, cores, etc., can solve the problems of high cost and low yield of regeneration process, achieve good size, high yield, and reduce environmental pollution Effect

Active Publication Date: 2022-01-14
江西特欣实业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the technical problems of high cost and low yield of existing coated sand regeneration process in the background technology, the present invention provides a low-cost environment-friendly coated sand and its preparation method, which can effectively reduce the The production cost reaches 15%-22%. In addition, the present invention effectively utilizes the discarded old sand resource and has no pollution to the environment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] A low-cost and environmentally friendly coated sand:

[0037] 1. Take an aqueous solution of acetonitrile, add lauryl acrylate and monolauryl phosphate to mix (7.2% by mass percentage of lauryl acrylate, 2.8% of monolauryl phosphate, and the rest is an aqueous solution of acetonitrile with a volume fraction of 65%), and continue after ultrasonication for 15 minutes Stir for 1 h (ultrasonic power is 430W, frequency is 36kHz, temperature is 50°C, stirring speed is 600r / min, the same below) to obtain the stripping aid.

[0038] 2. Take the old sand of coated sand by parts by weight (selected from the old sand produced after casting and using the coated sand prepared by using phenolic resin as a binder, the particle size after crushing and magnetic separation is selected 50-120 mesh, the same below ) 280 parts, 24 parts of peeling aids, 14 parts of binder (thermoplastic phenolic resin, the same below), 1.2 parts of curing agent (hexamethylenetetramine aqueous solution with ...

Embodiment 2

[0041] A low-cost and environmentally friendly coated sand:

[0042] 1. Take an aqueous solution of acetonitrile, add lauryl acrylate and monolauryl phosphate to mix (8.0% by mass percentage of lauryl acrylate, 2.4% of monolauryl phosphate, and the rest is an aqueous solution of acetonitrile with a volume fraction of 65%), and continue after ultrasonication for 15 minutes Stir for 1 h to obtain the stripping aid.

[0043] 2. Take 260 parts of coated sand used sand, 27 parts of stripping aid, 12 parts of binder, 1.0 part of curing agent and 0.6 part of lubricant in parts by weight.

[0044] 3. Take the old coated sand, pour it into the stripping aid, vibrate and break it, and stir it for 30 minutes, then immediately transfer it to a cold storage with a temperature of -48±3°C, freeze it for 3 hours, take it out, and mechanically impact it, rub it out of the mold, and finally blow it Gas separation to obtain reclaimed sand; the obtained regenerated sand is heated to 135°C and tr...

Embodiment 3

[0046] A low-cost and environmentally friendly coated sand:

[0047] 1. Take acetonitrile aqueous solution, add lauryl acrylate and monolauryl phosphate to mix (according to the mass percentage, lauryl acrylate is 6.5%, monolauryl phosphate is 3.2%, and the rest is acetonitrile aqueous solution with a volume fraction of 65%). After ultrasonication for 15 minutes, continue Stir for 1 h to obtain the stripping aid.

[0048]2. Take 295 parts of coated sand and old sand, 20 parts of stripping aid, 15 parts of binder, 1.4 parts of curing agent, and 0.5 parts of lubricant in parts by weight.

[0049] 3. Take the old coated sand, pour it into the stripping aid, vibrate and break it, and stir it for 30 minutes, then immediately transfer it to a cold storage at a temperature of -48±3°C, take it out after freezing for 4 hours, and mechanically impact, rub and demould, and finally blow Gas separation to obtain regenerated sand; the obtained regenerated sand is heated to 140°C and transf...

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Abstract

The invention discloses low-cost environment-friendly precoated sand and a preparation method thereof, and particularly belongs to the technical field of precoated sand manufacturing and recycling. The low-cost environment-friendly precoated sand is prepared from the following raw materials in parts by mass: 250 to 300 parts of used precoated sand, 18 to 27 parts of a stripping auxiliary agent, 12 to 15 parts of a binder, 1.0 to 1.4 parts of a curing agent and 0.5 to 0.6 part of a lubricant, wherein the stripping auxiliary agent is prepared from lauryl acrylate, monolauryl phosphate and an acetonitrile water solution. According to the method, residual molten metal in the used sand is removed through magnetic separation, then the stripping auxiliary agent is added for vibration cracking, then the used sand is frozen, finally, a phenolic resin film on the surface of the used sand can be completely removed through simple mechanical treatment, and the regenerated sand is obtained. According to the method, waste sand resources are fully utilized, environmental pollution is reduced, and ecological balance is protected; and according to the method, the defect that the recycling and regenerating cost of the existing used precoated sand is too high is overcome, and the comprehensive cost is reduced by 15%-22% compared with the manner that new sand is completely used.

Description

technical field [0001] The invention belongs to the technical field of manufacture and recycling of coated sand, and in particular relates to a low-cost and environment-friendly coated sand and a preparation method thereof. Background technique [0002] Studies have shown that in the sand casting production process, 1-7 tons of used sand will be produced for every 1 ton of castings produced. Coated sand, as a large category of molding sand, has a large amount of use, and the used coated sand is generally treated as waste sand; this is because the surface of the used coated sand and old sand has various cured resin bonds. The curing process of this kind of resin binder is generally irreversible, so it is relatively difficult to recover this kind of old sand, the required equipment is huge and complicated, the energy consumption is high, the cost is high, and the yield of the obtained recycled coated sand is low. Application No. 200710300278.0 discloses a camshaft sand mold m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22C1/02B22C5/04
CPCB22C1/02B22C5/04Y02W30/91
Inventor 余俊潘是凯
Owner 江西特欣实业有限公司
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