Acid-cured environment-friendly binder and preparation method thereof

An environmentally friendly, adhesive technology

Active Publication Date: 2012-08-15
BANGNI CHEM TIANJIN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These resins release harmful components formaldehyde and phenol during the heating process of casting, so the pollution is serious during pouring, and the working environment threatens the health of workers
At the same time, a large amount of waste sand is produced during production, which consumes a large amount of natural resources and causes environmental pollution. The quality of castings is lower than international standards.

Method used

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  • Acid-cured environment-friendly binder and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Firstly, the raw materials were weighed, which contained 60% cardanol, 20% furfuryl alcohol extracted from corncobs, 8% potassium hydroxide, and 12% water.

[0022] Then cardanol is put into the reaction kettle after the moisture and ash content are qualified, and when the temperature is raised to 40°C-60°C, potassium hydroxide is added to catalyze it, and the cardanol self-polymerizes to 8-100,000 MPa·s under alkaline conditions at high temperature; Continue to heat up to 100°C-120°C, keep warm for 0.5-1.5 hours, continue to heat up to 280°C-350°C, keep warm for 1.5-3.5 hours; then lower to 40°C-60°C and adjust the pH value to 4 ~5.5, add furfuryl alcohol, raise the temperature to 80℃~110℃, keep warm for 0.5-1.5 hours; then lower the temperature to 40℃~60℃, add water to adjust the pH value to 6--8, and then adjust the viscosity to prepare Get the product. Subsequently, various characterization tests were carried out on the product, and the results proved to be the des...

Embodiment 2

[0026] Firstly, raw materials were weighed, which contained 50% eugenol, 30% furfuryl alcohol extracted from corncobs, 8% potassium hydroxide, and 12% water.

[0027] After the eugenol is tested to pass the moisture and ash content, put it into the reaction kettle, and add barium hydroxide to catalyze it when the temperature rises to 50°C-60°C. Raise the temperature to 110°C-120°C, keep it warm for 0.5-1 hour, continue to raise the temperature to 290°C-350°C, keep it warm for 1.5-2.5 hours; then lower it to 50°C-60°C and adjust the pH value to 4-5, Add furfuryl alcohol, raise the temperature to 100°C-110°C, keep warm for 0.5-1 hour; then lower the temperature to 50°C-60°C, add water to adjust the pH value to 7-8, and then adjust the viscosity to obtain the product. Subsequently, various characterization tests were carried out on the product, and the results proved to be the desired product.

Embodiment 3

[0029] Firstly, raw materials were weighed, which contained 55% guaiacol, 25% furfuryl alcohol extracted from corncobs, 8% barium hydroxide, and 12% ethanol.

[0030] After the guaiacol is tested for moisture and ash content, it is put into the reaction kettle, and when the temperature rises to 50°C-55°C, barium hydroxide is added to catalyze it, and the guaiacol self-polymerizes at high temperature to 85,000-90,000 MPa under alkaline conditions. s; continue to heat up to 115°C-120°C, keep warm for 1-1.5 hours, continue to heat up to 290°C-330°C, keep warm for 1.5-2 hours; then lower to 50°C-55°C and adjust the pH value to 4.5~5, add furfuryl alcohol, raise the temperature to 115℃~120℃, keep it warm for 1-1.5 hours; then drop the temperature to 50℃~55℃, add ethanol to adjust the pH value to 7.5--8, and then adjust the viscosity to obtain product. Subsequently, various characterization tests were carried out on the product, and the results proved to be the desired product.

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Abstract

The invention discloses an acid-cured environment-friendly binder consisting of the following formula ingredients in percent by weight: 50%-70% of plant phenolics and 20%-40% of furfuryl alcohol which are extracted from natural resources, 2%-10% of strong base type catalyst and 8%-20% of an inert solvent. A preparation method of the acid-cured environment-friendly binder comprises the steps of firstly, weighing materials by weight ratios; adding the plant phenolics in a reaction kettle; adding the catalyst when the temperature is increased to 40-60 DEG C; then increasing the temperature to 100-120 DEG C and keeping the temperature for 0.5-1.5 hours; continuously increasing the temperature to 280-350 DEG C and keeping the temperature for 1.5-3.5 hours; then lowering the temperature to 40-60 DEG C, regulating the pH value to 4-4.5, adding the furfuryl alcohol, increasing the temperature to 80-110 DEG C and keeping the temperature for 0.5-1.5 hours; and then lowering the temperature to 40-60 DEG C, adding the inert solvent, regulating the pH value to 6-8, and after that, regulating viscosity.

Description

technical field [0001] The invention relates to the field of chemical binders, in particular to an acid-cured environment-friendly binder and a preparation method thereof, which can be used in the production of cast steel, cast iron and nonferrous metals. Background technique [0002] Molding sand used in the foundry industry consists of sand etc. mixed with suitable binders. The binder creates a strong bond between the grains of the sand, giving the molding sand the necessary mechanical stability. Since the beginning of this century, the foundry industry around the world is facing two challenges: one is the continuous improvement of casting quality requirements; the other is the increasingly stringent requirements for environmental protection and clean production. At present, a class of adhesives used in the foundry industry is phenolic resins, such as furan resins, alkali phenolic resins, resole phenolic resins and water glass resins. These resins all release harmful com...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J161/14B22C1/22
Inventor 王海江
Owner BANGNI CHEM TIANJIN
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