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Method for producing hot-box resin for casting

A production method and hot core box technology, which are applied in casting molding equipment, casting molds, cores, etc., can solve the problems of fast gas generation, unstable strength, and inability to overcome, and achieve improved product performance, smooth appearance, Fast curing effect

Inactive Publication Date: 2013-12-11
KOCEL GROUP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It is mainly restricted by three aspects: 1) The hot core box resin generally has a strong smell, mainly because the resin contains a large amount of free formaldehyde, which pollutes the environment and damages the health of workers; The gas speed is fast, and casting defects are easy to occur; 3) The sand core has poor moisture absorption resistance and unstable strength
[0004] The above three factors have hindered the application of hot box resin to a certain extent, and so far, there is no method to overcome the above defects

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Embodiment 1: A production method of hot box resin for casting, characterized in that: the weight percentage of its raw materials is: formaldehyde aqueous solution: 45%, urea: 4%, phenol: 18%, furfuryl alcohol: 57%, Modifier: 2%, enhancer 0.4%

[0028] Its method comprises the following steps:

[0029] a. Heat and dissolve the above-mentioned amount of phenol, add it into the reaction kettle, start the mixer, add the above-mentioned amount of formaldehyde solution and furfuryl alcohol in turn, and use NaOH lye to bring the pH value of the feed solution to 9-10;

[0030] b. Open the steam valve, raise the temperature to 90-95°C within 40-60 minutes, and keep the temperature for 60 minutes;

[0031] c. Add 1 / 2 of the amount of NaOH lye in the first step, at 90-95°C, keep the temperature for 30 minutes;

[0032] d. After the heat preservation is over, lower the temperature to 80°C, adjust the pH value to 4.5-5.5 with formic acid, and vacuum dehydrate. The dehydration amo...

Embodiment 2

[0038] Embodiment 2: A kind of production method of casting hot box resin, it is characterized in that: the weight percentage of its raw material is: formaldehyde aqueous solution: 55%, urea: 6%, phenol: 22%, furfuryl alcohol: 48%, Modifier: 4%, enhancer 0.6%

[0039] Its method comprises the following steps:

[0040] a. Heat and dissolve the above-mentioned amount of phenol, add it into the reaction kettle, start the mixer, add the above-mentioned amount of formaldehyde solution and furfuryl alcohol in turn, and use NaOH lye to bring the pH value of the feed solution to 9-10;

[0041] b. Open the steam valve, raise the temperature to 90-95°C within 40-60 minutes, and keep the temperature for 60 minutes;

[0042] c. Add 1 / 2 of the amount of NaOH lye in the first step, at 90-95°C, keep the temperature for 30 minutes;

[0043] d. After the heat preservation is over, lower the temperature to 80°C, adjust the pH value to 4.5-5.5 with formic acid, and vacuum dehydrate. The dehydr...

Embodiment 3

[0049] Embodiment 3: A production method of hot box resin for casting, characterized in that: the weight percentage of its raw materials is: formaldehyde aqueous solution: 65%, urea: 8%, phenol: 26%, furfuryl alcohol: 39%, Modifier: 6%, enhancer 0.8%

[0050] Its method comprises the following steps:

[0051] a. Heat and dissolve the above-mentioned amount of phenol, add it into the reaction kettle, start the mixer, add the above-mentioned amount of formaldehyde solution and furfuryl alcohol in turn, and use NaOH lye to bring the pH value of the feed solution to 9-10;

[0052]b. Open the steam valve, raise the temperature to 90-95°C within 40-60 minutes, and keep the temperature for 60 minutes;

[0053] c. Add 1 / 2 of the amount of NaOH lye in the first step, at 90-95°C, keep the temperature for 30 minutes;

[0054] d. After the heat preservation is over, lower the temperature to 80°C, adjust the pH value to 4.5-5.5 with formic acid, and vacuum dehydrate. The dehydration amou...

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Abstract

The invention relates to a method for producing hot-box resin for casting. The method comprises the following steps of heating to melt and dissolve phenol, adding into a reaction kettle, and starting a stirrer; sequentially adding a formaldehyde aqueous solution and furfuryl alcohol; adjusting the pH value of the feed liquid to 9-10 by use of alkaline liquid; opening a steam valve, heating and timing for heat preservation; further adding 1 / 2 of the alkaline liquid, and timing for heat preservation for 30 minutes; after the heat preservation, cooling to 80 DEG C, adjusting the pH value to 4.5-5.5 by use of formic acid, and performing vacuum dehydration; adding urea, heating to 90-95 DEG C, and timing for heat preservation for 60 minutes; cooling to 70 DEG C, adding furfuryl alcohol and a modifier, and stirring; cooling to 40 DEG C, adding a reinforcing agent, and adding an aqueous solution of sodium hydroxide to adjust the pH value to 7-8; and continuously stirring for 15 minutes, discharging, packaging and storing. The method provided by the invention has the advantages of uniqueness, low gas generation, low free aldehyde content, high strength and good moisture resistance, and is suitable for medium and small sand cores.

Description

technical field [0001] The invention relates to a production method of hot box resin, in particular to a production method of hot box resin for casting. Background technique [0002] At present, my country's foundry industry is in the growth stage, and the world's foundry industry is shifting to China. Regardless of the quantity and quality of castings, it is increasing year by year. With the development and application in recent years, the hot core box core making process is more and more recognized by the industry because of its advantages of high production efficiency, high dimensional accuracy, and high sand mold strength. It provides a very effective method for the rapid production of medium and small sand cores with high dimensional accuracy, and is widely used in the mass flow production of small and medium sand cores in automobiles, tractors and similar industries. [0003] Domestic hot core box core making technology started late and developed relatively slowly. I...

Claims

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Application Information

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IPC IPC(8): C08G14/12B22C1/22
Inventor 韩文杨洋何龙
Owner KOCEL GROUP
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