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Resin precoated sand and preparation method thereof

A technology of resin coating and coating sand, which is applied in the field of foundry molding to achieve the effects of low expansion characteristics, reduced veining, and good coating effect.

Inactive Publication Date: 2018-11-06
CHONGQING CHANGJIANG RIVER MOLDING MATERIAL GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to provide a resin-coated sand and its preparation method to form a coordinated expansion behavior technical effect by adjusting the high-temperature phase material component ratio of the aggregate, so as to obtain suitable thermal expansion according to different casting applications. High-efficiency resin-coated sand products solve various technical problems of casting expansion defects caused by inappropriate expansion behavior

Method used

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  • Resin precoated sand and preparation method thereof
  • Resin precoated sand and preparation method thereof
  • Resin precoated sand and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0043] A preparation method of resin-coated sand, comprising the following steps:

[0044] (1) Aggregate: 78.5% of calcined sand and 21.5% of regenerated sand are used to prepare aggregate for coating, which contains 49.4% of low-temperature phase β phase, 40.4% of high-temperature phase α phase, 5.7% of orthoclase, and 5.7% of orthoclase. Plagioclase 4.5%.

[0045] The reclaimed sand includes the following:

[0046] A. Regenerated sand derived from the waste sand formed by phenolic resin-coated sand applied to non-ferrous metal, ferrous metal and cast steel casting by thermomechanical regeneration process;

[0047] B. Regenerated sand obtained by thermo-mechanical regeneration process after applying cold core box resin sand to waste sand formed by casting of non-ferrous and ferrous metals;

[0048] C, derived from the regenerated sand prepared by the thermomechanical regeneration process after the furan resin sand is applied to the waste sand formed by non-ferrous ferrous m...

Embodiment 2

[0056] The difference from Example 1 is that in step (1), 100% of regenerated sand is selected as the aggregate for coating, which contains 0% of low-temperature phase β phase, 95.7% of high-temperature phase α phase, and 4.3% of orthoclase. %, containing plagioclase 0%; in step (2), the amount of thermoplastic resin accounts for 3.5% of the total aggregate amount; in step (3), the aggregate is heated to 140 ° C, the viscosity of thermoplastic resin at 132 ° C Add to the aggregate at 400 cp, add curing agent urotropine accounting for 20% of the resin, and calcium stearate as a release agent accounting for 0.2% of the aggregate to mix sand. The speed of sand mixing is 80r / min. After mixing uniformly, the resin-coated sand is obtained by crushing, screening and cooling, and the total ignition loss of the prepared coated sand is controlled to be 4.5%. Example 3

Embodiment 3

[0057] The difference from Example 1 is that in step (1), 10% of scrubbing sand, 25% of calcined sand, and 65% of regenerated sand are used as aggregates for coating, which contain 25.1% of low-temperature phase β phase and 25.1% of high-temperature phase. α phase 66.3%, orthoclase 7.2%, plagioclase 1.4%; in step (2), the average degree of polymerization of the thermoplastic resin is 8-15, the number-average molecular weight distribution is 800-16000, and the weight-average molecular weight distribution is 900-20,000, wherein the ratio of number-average molecular weight to weight-average molecular weight is between 1.3 and 4, and the amount of thermoplastic resin accounts for 1% of the total aggregate amount; in step (3), the aggregate is heated to 140 ° C, and the thermoplastic resin is in When the viscosity at 130℃ is 450cp, it is added to the aggregate, and the curing agent urotropine, which accounts for 18% of the resin, and the release agent calcium stearate, which account...

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Abstract

The invention belongs to the technical field of casting modeling, and particularly discloses resin precoated sand and a preparation method thereof. The precoated sand comprises aggregate and thermoplastic resin. The content of a low-temperature phase beta in the aggregate is 0-51%, and the content of a high-temperature phase alpha is 35-100%. The content ratio of orthoclase in a total crystallinephase structure in the aggregate is not more than 16%, and the content ratio of anorthose in the total crystalline phase structure in the aggregate is not more than 5%. According to the technical method, the technical effect that coordinated expansion behavior is formed by adjusting the relation of the component ratio of high-temperature phase materials of the aggregate is achieved, so that a resin precoated sand product suitable for the thermal expansivity according to different pouring application needs is obtained, and the technical problem that various casting expansion type defects are caused by the fact that expansion behavior is not applicable is solved.

Description

technical field [0001] The invention belongs to the technical field of casting modeling, and specifically discloses a resin-coated sand and a preparation method thereof. Background technique [0002] Resin-coated sand is molding sand or core sand whose surface is covered with a layer of solid resin film before molding. Resin-coated sand is usually composed of scrubbing sand as aggregate, thermoplastic resin as binder, urotropine as curing agent, and other additives added to improve a certain performance. It is processed by configuration processes such as film, wet lamination and cold lamination. Resin-coated sand is widely used in the production of castings with high surface quality requirements, complex inner cavity structure and strict dimensional accuracy control due to its high thermal curing strength, low gas generation, and good collapsibility. [0003] Resin-coated sand becomes waste foundry sand after molding, pouring, and falling sand. Waste foundry sand can be tu...

Claims

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Application Information

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IPC IPC(8): B22C1/00B22C1/02
CPCB22C1/00B22C1/02
Inventor 熊帆熊鹰王丽峰
Owner CHONGQING CHANGJIANG RIVER MOLDING MATERIAL GRP
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