High-temperature-resistance and high-strength precoated sand and preparation method thereof

A technology of coated sand and high strength, applied in the field of molding materials, can solve the problems of low strength and poor thermal stability of coated sand, and achieve the effects of low expansion rate, long heat resistance time and simple preparation process

Active Publication Date: 2016-01-13
ZHANGWU LIANXIN JINYING CASTING MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In order to overcome the deficiencies in the prior art, the object of the present invention is to provide a high-temperature-resistant high-strength coated sand and its preparation method. The preparation method of the present invention is simple and can solve the problem of thermal stability of the existing coated sand at high temperatures Poor, low strength and other issues

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  • High-temperature-resistance and high-strength precoated sand and preparation method thereof
  • High-temperature-resistance and high-strength precoated sand and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0021] First dissolve 1.1 parts of thermoplastic phenolic resin into solution with 0.6 parts of ethanol, then add 0.8 parts of chopped glass fiber with a length of 0.1mm and 0.04 parts of silane coupling agent to the solution, and simultaneously mix 0.15 parts of urotropine with 1 part Aqueous solution, let the solution stand for 1 hour for later use; then preheat 100 parts of dry sand to 125 ° C, add thermoplastic phenolic resin solution for sand mixing for 60 seconds, then add urotropine aqueous solution for sand mixing for 50 seconds, and finally add 0.12 parts of montan wax Mix sand for 16 seconds, and the above data are the percentage of silica sand. The obtained coated sand is tested with a resin sand high temperature performance tester, and the results are as follows:

[0022] The coated sand produced in this example has a high temperature strength of 0.15 MPa at a high temperature of 1200° C. for 6 seconds, good high temperature stability, and a high temperature linear...

Embodiment 2

[0024] First dissolve 1.2 parts of thermoplastic phenolic resin into solution with 0.7 parts of ethanol, then add 0.9 parts of chopped glass fiber with a length of 0.2 mm and 0.05 parts of silane coupling agent to the solution, and let the solution stand for 1.5 hours for later use; at the same time, add 0.18 1 part of urotropine and 1.1 parts of aqueous solution, then preheat 100 parts of dried sand to 130°C, add thermoplastic phenolic resin solution for sand mixing for 65 seconds, then add urotropine aqueous solution for sand mixing for 53 seconds, and finally add 0.13 parts of montan wax Mix sand for 18 seconds, and the above data are the percentage of silica sand. The prepared coated sand was subjected to normal temperature tensile strength test and high temperature performance test, the results are as follows:

[0025] The normal temperature tensile strength of the coated sand produced in this example reaches 3.5 MPa, the high temperature strength at 1200° C. for 6 second...

Embodiment 3

[0027] First dissolve 1.3 parts of thermoplastic phenolic resin into solution with 0.8 parts of ethanol, then add 1 part of chopped glass fiber with a length of 0.3 mm and 0.06 parts of silane coupling agent to the solution, and let the solution stand for 2 hours for later use; 1 part of urotropine and 1.2 parts of aqueous solution, then preheat 100 parts of dried sand to 132°C, add thermoplastic phenolic resin solution for sand mixing for 70s, then add urotropine aqueous solution for sand mixing for 54s, and finally add 0.15 parts of montan wax Just mix sand for 20 seconds, and the above data are the percentage of silica sand. The obtained coated sand was tested with resin sand normal temperature flexural strength and high temperature performance tester, the results are as follows:

[0028] The coated sand produced in this example has a high temperature strength of 0.180 MPa at a high temperature of 1200° C. for 6 seconds, good high temperature stability, and a high temperatu...

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Abstract

The invention discloses high-temperature-resistance and high-strength precoated sand and a preparation method thereof, and belongs to the technical field of shaping materials in casting production. Firstly, thermoplastic phenolic resins are dissolved to solution by ethanol, and are added with chopped glass fibers and a silane coupling agent; then, dried sand is preheated to a temperature of 120-135 DEG C; the thermoplastic phenolic resin solution is added for sand mixing by 60-70 s; urotropin water solution is added for sand mixing by 50-55 s; and finally, lignite wax is added for sand mixing by 15-20 s. The precoated sand comprises the components of: 100 parts of dried sand, 1-1.3 parts of thermoplastic phenolic resins, 0.6-0.8 part of ethanol, 0.8-1 part of chopped glass fibers, 0.04-0.06 part of silane coupling agent, 0.15-0.2 part of urotropin, 0.9-1.1 parts of distilled water and 0.1-0.15 part of lignite wax. The precoated sand is simple in preparation method, and can solve such problems as weak thermal stability and low strength in traditional precoated sand at high temperature.

Description

technical field [0001] The invention relates to the technical field of molding materials in casting production, in particular to a high-temperature-resistant high-strength coated sand and a preparation method thereof. Background technique [0002] When the coated sand prepared by the traditional process is used to make cores in foundry production, due to its poor thermal stability and low strength at high temperatures, it cannot resist the thermal stress caused by the expansion of the sand core during the casting process. , leading to cracking of the sand core and the infiltration of molten metal to cause cracks in the casting, and it is also easy to cause sand sticking. The light ones will increase the cleaning work of the casting surface, and the severe ones will lead to the scrapping of the castings, which will increase the production cost and reduce the production efficiency in the casting process. Contents of the invention [0003] In order to overcome the deficienci...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22C1/00
Inventor 钟飞升李家波张宇辉邓宇辉叶利
Owner ZHANGWU LIANXIN JINYING CASTING MATERIAL CO LTD
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