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Determination method of furfuryl alcohol content in no-bake furan resin for casting

A technology of furan resin and determination method, applied in the field of detection, to achieve the effects of shortening the test period, reducing risks and losses, and stabilizing the quality of the casting mold

Active Publication Date: 2013-05-15
江苏皓一机械制造有限公司
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Problems solved by technology

[0005] The current national standard "No-bake Furan Resin for Foundry" (JB / T7526-2008) stipulates the determination methods of viscosity, density, free formaldehyde, nitrogen content, free phenol, and tensile strength at room temperature, but the furfuryl alcohol content that directly affects high-temperature strength how to measure no

Method used

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  • Determination method of furfuryl alcohol content in no-bake furan resin for casting
  • Determination method of furfuryl alcohol content in no-bake furan resin for casting
  • Determination method of furfuryl alcohol content in no-bake furan resin for casting

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Embodiment 1

[0028] (1) For the calibration of 0.1mol / L sodium thiosulfate, record the calibration concentration as C:

[0029] Accurately weigh 26g sodium thiosulfate (Na 2 S 2 o 3 ·5H 2 O) (or 16g of anhydrous sodium thiosulfate), add 0.2g of anhydrous sodium carbonate, dissolve in 1000ml of water, boil slowly for 10 minutes, cool, and filter after two weeks in the dark.

[0030] Weigh 0.18g (accurate to 0.1000g) of benchmark potassium dichromate dried at 120°C±2°C to constant weight, put it in an iodine measuring bottle, dissolve it in 25ml of water, add 2g of potassium iodide and 20ml (20%) of sulfuric acid solution , shake well, and place in the dark for 10 minutes.

[0031] Add 150ml of water, titrate with the prepared sodium thiosulfate solution until the solution changes from blue to bright green, and conduct a blank test at the same time.

[0032] C ( Na 2 S 2 ...

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Abstract

The invention relates to a determination method of furfuryl alcohol content in no-bake furan resin for casting, and belongs to the technical field of detection. The determination method of furfuryl alcohol content in no-bake furan resin for casting comprises the following steps of: determining the content of main ingredient furfuryl alcohol in furan resin by adopting back titration of iodometry, wherein the reaction flow mainly comprises the following substeps of: firstly carrying out bromination reaction on samples, bromine, glacial acetic acid and hydrochloric acid; then dropping in potassium iodide for replacement reaction after bromination; and finally dropping in insodium thiosulfate for reaction. Through the determination method provided by the invention, the furfuryl alcohol content in no-bake furan resin for casting can be determined, so that on one hand, the furfuryl alcohol content can be grasped effectively when the no-bake furan resin is in check-out, the quality for using no-bake furan resin is ensured, the cast quality is stabilized, and the cast rejection rate caused by casts is lowered greatly, and on the other hand, the quality of resin can be evaluated through sample test when new suppliers are developed, so that the test cycle is shortened, the hazard and loss of material object test failure are lowered, and meanwhile basis is provided for confirming the price of resin.

Description

technical field [0001] The invention relates to a method for measuring furfuryl alcohol content in no-hardening furan resin for casting, and belongs to the detection technical field. Background technique [0002] In modern foundry production technology, no-hardening furan resin sand is widely used in the production of castings with complex shapes and high dimensional accuracy due to its good dimensional stability, high mold strength and good collapsibility. [0003] The products of enterprises producing wind power castings in China mainly include various wind power castings such as hubs, bases (cabin seats), bearing housings, gear boxes, and planetary frames. Due to the high technical requirements of wind power castings, for example, the compactness of castings must meet ultrasonic non-destructive testing. Requirements, the purity of castings meets the requirements of magnetic particle non-destructive testing, so cast no-hardening furan resin sand is generally used as the mo...

Claims

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Application Information

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IPC IPC(8): G01N21/78
Inventor 沈华张敏
Owner 江苏皓一机械制造有限公司
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