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Modified phenolic furan resin and its binder

A phenolic furan resin, modified technology, applied in casting molding equipment, manufacturing tools, cores, etc., can solve the problems of large shrinkage stress of castings, hinder casting shrinkage, poor yield, etc., to improve yield and reduce heat Crack tendency, plasticity increase effect

Active Publication Date: 2018-08-03
SUZHOU XINGYE MATERIALS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The object of the present invention is to provide a furan resin for casting and its binder, to overcome the poor overall yield of the casting mold in the prior art, hinder the shrinkage of the casting during the solidification and shrinkage of the casting, and cause a large shrinkage inside the casting stress, and even defects that produce cracks

Method used

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  • Modified phenolic furan resin and its binder
  • Modified phenolic furan resin and its binder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Preparation of modified furan resin: place a four-neck flask equipped with a stirrer, a reflux condenser and a thermometer that has been added with 100 grams of 37% formaldehyde and 77.8 grams of phenol in an oil bath with adjustable temperature, start stirring, and use an appropriate amount of Use 10% sodium hydroxide solution to adjust the pH value between 8 and 10, heat up and reflux for 1 to 2 hours, cool to below 60°C, and remove water in a vacuum. Add 15 grams of ethylenediamine, 25 grams of cardanol, 20 grams of glucose, and reflux for 0.5 to 1 hour; add 114 grams of furfuryl alcohol for cooling, adjust the pH to 4.5 to 5.0 with 10% hydrochloric acid solution, and heat and reflux for 1 to 2 hours; And to pH=7±0.7, namely produce base resin of the present invention.

Embodiment 2-1

[0032] Modified phenolic furan resin binder, according to the mass percentage: 30wt% of the resin prepared in Example 1, 69.7wt% of furfuryl alcohol, 0.3wt% of silane, stirred evenly at room temperature, and made into a finished product.

Embodiment 2-2

[0034] Modified phenolic furan resin binder, according to mass percentage: 50wt% of the resin obtained in Example 1, 49.7wt% of furfuryl alcohol, 0.3wt% of silane, stirred evenly at room temperature, and made into a finished product.

[0035] The thermal deformation of the samples made with the furan resin of the present invention is far less than that of the general furan resin (nitrogen-free) according to the thermal deformation test. As can be seen from the data of thermal deformation test, the thermal deformation of general-purpose furan resin (no nitrogen) is 2.58mm, is 1.54mm with base resin (embodiment 2-1) of the present invention, (embodiment 2-2), Its thermal deformation is only 1.01mm, which is only 39% of the original. Judging from the shape of the thermal deformation curve, the plasticity of the sand mold prepared by the present invention is also increased, and the yield is improved. This greatly reduces the hot cracking tendency of castings produced with furan r...

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Abstract

The invention belongs to the technical field of organic chemistry, and discloses a modified phenolic furan resin, which is prepared by the following method: formaldehyde and phenol are stirred and mixed according to a certain molar ratio, heated and kept warm under an alkaline catalyst, dehydrated, and polyamine is added The compound undergoes addition reaction, and at the same time, long-chain molecules are introduced as chain-extending and toughening modifiers, furfuryl alcohol is added, acidic heating and heat preservation is carried out to obtain a resin; finally, furfuryl alcohol and silane are added to obtain a binder. The furan resin obtained in the invention has good high-temperature retreat performance and is suitable for the production of steel castings.

Description

technical field [0001] The invention belongs to the technical field of organic chemistry, and specifically relates to resins, in particular to a furan resin and a binder for casting with excellent high-temperature yield performance. Background technique [0002] Foundry production has a history of more than 5,000 years, and the application of synthetic binders is only fifty or sixty years old. In recent years, no-bake resin sand has been widely used in foundry production all over the world, and furan resin is the most used type of foundry resin in my country. [0003] Furan resin sand can be hardened by adding an acidic curing agent at room temperature, with high core strength, strong air permeability, small deformation, good collapsibility, good surface finish of castings, high dimensional accuracy, reduced labor intensity, and high production efficiency. The development of furan resin sand molding technology has changed the long-standing backward situation of cast steel w...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G16/02B22C1/22
Inventor 朱文英王文浩王锦程
Owner SUZHOU XINGYE MATERIALS TECH