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Acid curing adhesive and preparation method of acid curing adhesive

A binder and acid curing technology, applied in manufacturing tools, casting equipment, metal processing equipment, etc., can solve the problems of large discharge of waste sand, low regeneration rate of molding sand, etc., achieve high surface quality, reduce regeneration costs, The effect of eliminating the need for a thermal regeneration process

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

[0003] The purpose of the present invention is to propose a non-polluting acid that does not pollute the environment, aiming at the disadvantages of the adhesives in the prior art that release harmful fumes such as formaldehyde and phenol, the prepared molding sand regeneration rate is low, and the amount of waste sand is large. Curing the adhesive, thus effectively solving the shortcomings of the prior art

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Firstly, raw materials were weighed, which contained 70% cardanol, 20% furfuryl alcohol extracted from corncobs, 2% furfural extracted from corncobs, 6% urea, and 2% potassium hydroxide.

[0021] After the cardanol is tested for moisture and ash content, it is put into the reaction kettle, and furfural and urea are added to copolymerize at the same time, and the temperature is raised to 40°C-60°C, and potassium hydroxide is added for catalysis, and the temperature is kept for 30 minutes. Then raise the temperature to 80°C-90°C, keep it warm for 1.5 hours, then raise the temperature to 100°C-120°C, keep it warm for 0.5-1.5 hours. Then the temperature is lowered to 40°C-60°C, adding furfuryl alcohol to adjust the pH value, when the pH value is 4-5.5, the temperature is raised to 90°C-110°C, reacted for 0.5-1.5 hours, and then lowered to 40°C-60 °C, adjust the pH value to 6--7 to obtain the product. Various characterization tests were carried out on the product, and the r...

Embodiment 2

[0024] Firstly, the raw materials are weighed, which contains 60% eugenol, 20% furfuryl alcohol extracted from oat or wheat bran, 2% furfural extracted from oat or wheat bran, 10% urea, and 8% sodium hydroxide.

[0025] After the eugenol passed the test of moisture and ash, put it into the reaction kettle, add furfural and urea to copolymerize at the same time, heat up to 50°C--60°C, add sodium hydroxide as a catalyst, and keep it warm for 30 minutes. Then raise the temperature to 85°C-90°C, keep it warm for 1.5 hours, then raise the temperature to 105°C-120°C, keep it warm for 0.5-1 hour. Then the temperature is lowered to 50°C-60°C, adding furfuryl alcohol to adjust the pH value, when the pH value is 4.5-5, the temperature is raised to 100°C-110°C, reacted for 0.5-1 hour, and then cooled to 50°C-60°C, The pH value was adjusted to 6.5--7 to obtain the product. Various characterization tests were carried out on the product, and the results showed that it was the desired produ...

Embodiment 3

[0027] First, weigh the raw materials, which contain 50% guaiacol, 25% furfuryl alcohol extracted from oat or wheat bran, 10% furfural extracted from oat or wheat bran, 7% urea, and 8% sodium hydroxide. %.

[0028] After the guaiacol passes the test of moisture and ash content, it is put into the reaction kettle, and furfural and urea are added to copolymerize at the same time, and the temperature is raised to 40°C--55°C, and sodium hydroxide is added for catalysis, and the temperature is kept for 50 minutes. Then heat up to a temperature of 85°C to 90°C and keep warm for 1 hour, then raise the temperature to 110°C to 120°C and keep warm for 1 hour. Then the temperature is lowered to 40°C-55°C, adding furfuryl alcohol to adjust the pH value, when the pH value is 4.5-5, the temperature is raised to 110°C-120°C, reacted for 0.5-1 hour, and then cooled to 40°C-55°C, The pH value was adjusted to 6.5--7 to obtain the product. Various characterization tests were carried out on the...

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Abstract

The invention discloses an acid curing adhesive which comprises plant phenol, furfuryl alcohol and furfuraldehyde extracted from natural resources, strong alkali catalyst and urea, wherein the prescriptions and the weight percentages of the constituents are as follows: 50-70% of plant phenol, 20-40% of furfuryl alcohol, 0-20% of furfuraldehyde, 0-15% of urea and 0-10% of catalyst. The preparation method comprises the steps: weighing the raw materials according to the weight percentages, adding the plant phenol, the furfuraldehyde and the urea into a reaction kettle, adding the catalyst when the temperature is raised to 40-60 DEG C, carrying out heat preservation for 0.5-1.5 hours, warming the mixture to 80-90 DEG C, carrying out heat preservation for 0.5-1.5 hours, warming the mixture to 100-120 DEG C, carrying out heat preservation for 0.5-1.5 hours, cooling the mixture to 40-60 DEG C, adding the furfuryl alcohol into the mixture to adjust the PH value, warming the mixture to 90-110 DEG C when the PH value is 4-5.5, and keeping the reaction for 0.5-1.5 hours; cooling the mixture to 40-60 DEG C and adjusting the PH value to 6-7.

Description

technical field [0001] The invention relates to a chemical binder which does not pollute the environment, in particular to an acid-cured binder suitable for production in the foundry industry, and a preparation method thereof. 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 type of adhesive used in the foundry industry is phenolic resin, such as furan resin, alkali phenolic resin, resole phenolic resin and water glass resin. These resins all release harmful components formaldehyde and phenol duri...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22C1/20
Inventor 王海江
Owner BANGNI CHEM TIANJIN
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