High temperature resistance precoated sand

A technology of coated sand and high temperature resistance, which is applied in the field of foundry sand. It can solve the problems of poor heat resistance, easy sand sticking on castings, and large roughness, and achieve good heat resistance, small roughness, and reduced nitrogen pores. Effect

Inactive Publication Date: 2013-08-07
FANCHANG COUNTY HENGXIN AUTO PARTS
5 Cites 19 Cited by

AI-Extracted Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the defects and problems of poor heat resistance, large roughness, and easy sand sticking on castings in the prior a...
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Abstract

The invention discloses high temperature resistance precoated sand, which comprises base sand, a binder, hexamethylenetetramine, a phenol formaldehyde resin, a silane coupling agent and an additive A, wherein the base sand comprises, by weight, 55-60 parts of iron ore sand, 60-70 parts of forsterite sand, and 7-10 parts of diatomite, a particle size of the base sand is 100-150 mesh, 3-5 parts by weight of boric acid, 1-2 parts by weight of water-soluble polymer glue powder, 3-5 parts by weight of starch, 0.5-0.8 part by weight of rosin, 4-5 parts by weight of dextrin and 4-6 parts by weight of water are subjected to a reaction and drying to obtain the binder, 4-6 parts by weight of a straw powder material, 2-4 parts by weight of sepiolite and 5-8 parts by weight of water are subjected to a mixing calcination treatment to obtain the additive A, a particle size of the straw powder material is 0.5-0.8 mm, and the obtained calcined product, 2-4 parts by weight of montmorillonite powder and 3-4 parts by weight of water glass are subjected to mixing granulation. The high temperature resistance precoated sand has the following characteristics that: moisture absorption resistance is good, roughness is low, high temperature resistance is provided, and sand sticking on a cast is not easily generated.

Application Domain

Foundry mouldsFoundry cores

Technology Topic

Water soluble polymersRosin +17

Examples

  • Experimental program(1)

Example Embodiment

[0014] High temperature resistant coated sand, including raw sand, binder, urotropine, phenolic resin, silane coupling agent and additive A, in parts by weight, the raw sand is composed of 58 parts of soldering iron ore and 65 parts of forsterite A mixture of stone sand and 8 parts of diatomaceous earth, the particle size of the raw sand is 100-150 mesh, and the adhesive is composed of 3-5 parts of boric acid, 1-2 parts of water-soluble polymer powder, 3 -5 parts of starch, 0.5-0.8 parts of rosin, 4-5 parts of dextrin and 4-6 parts of water are stirred and reacted at 80-90°C for 1-2 hours, and dried after the reaction; the additive A is obtained by mixing 4 -6 parts of straw powder, 2-4 parts of sepiolite, 5-8 parts of water are mixed and calcined, the grain size of straw powder is 0.5-0.8mm, the calcined product is mixed with 2-4 parts of montmorillonite powder, 3- 4 parts of water glass are mixed and granulated, then roasted for 3-4 hours, the roasting temperature is controlled at 350-400℃, and the additive A is obtained after crushing;
[0015] The preparation method is as follows: first put 130 parts of raw sand into the blade type sand mixer, heat it to 130-150°C, and then put the 3 parts of adhesive into the raw sand for mixing time 40-50S, when The temperature of the raw sand is reduced to 90-110℃, 12 parts of urotropine are added, 8 parts of phenolic resin, 1.2 parts of silane coupling agent and 10 parts of additive A are added to mix for 40-50S after mixing for 10S. When the temperature is below 80℃, crush and screen to obtain coated sand.
[0016] Prepare a standard sample of coated sand according to the above method and test its various properties. The test results are as follows:
[0017] Bending strength at room temperature (MPa) 9.9 Hot bending strength (MPa) 2.15 Melting point (℃) 94 Ignition loss (mass fraction) (%) 0.15
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PUM

PropertyMeasurementUnit
Granularity100.0 ~ 150.0mesh
Granularity0.5 ~ 0.8mm
tensileMPa
Particle sizePa
strength10

Description & Claims & Application Information

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Classification and recommendation of technical efficacy words

  • Good heat resistance
  • Reduce roughness
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