Matched curing agent for casting furan resin and preparing method thereof
A furan resin and curing agent technology, which is applied to casting molding equipment, casting molds, manufacturing tools, etc., can solve the problems of large fluctuations in molding production quality and random use of curing agents, etc., and achieve fast mold turnover, rapid mold removal, The effect of improving catalytic activity
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[0023] The invention provides a method for preparing a curing agent for casting furan resin, which mainly includes the following steps. Unless otherwise specified, the raw materials used in the method of the present invention are all based on weight or weight percentage. The weight percentages of the raw materials used in the method of the present invention are: sulfuric acid: 27%-52%; phenol: 15%-22%; enhancer: 3%-7%; regulator: 0.5%-2%; water: 25%-46%. The total amount of each raw material is 100%.
[0024] The method includes the following steps:
[0025] a. Add phenol to the reactor, start the mixer, slowly add sulfuric acid through the high tank, and control the sulfuric acid addition rate so that the temperature of the materials in the reactor does not exceed 60°C;
[0026] b. After the addition of sulfuric acid, open the steam valve, heat up to 93-103°C within 30-40 minutes, and keep it warm for 90 minutes;
[0027] c. After keeping warm, cool down to 60°C, add enhancer, and...
Example Embodiment
[0035] Example one
[0036] a. Add 22% phenol to the reactor, start the mixer, slowly add 27% sulfuric acid through the high tank, and control the sulfuric acid addition speed so that the temperature of the materials in the reactor does not exceed 60°C;
[0037] b. After the addition of sulfuric acid, open the steam valve, heat up to 93-103°C within 30-40 minutes, and keep it warm for 90 minutes;
[0038] c. After the heat preservation is over, cool down to 60°C, add 3% enhancer, and stir for 15 minutes;
[0039] d. Reduce the temperature to 50°C, pass through the upper tank, add 46% of water;
[0040] e. After adding water, add 2% regulator and continue stirring for 15 minutes;
[0041] f. Cool down to 40°C, take samples and send them to the laboratory for inspection. After passing the test, measure and pack them into storage.
[0042] Description: The phenol sulfonic acid curing agent synthesized by this method is a very slow curing agent, which is suitable for the production of furan r...
Example Embodiment
[0043] Example two
[0044] a. Add 20% of phenol to the reactor, start the mixer, slowly add 32.5% sulfuric acid through the upper tank, and control the sulfuric acid addition speed so that the temperature of the materials in the reactor does not exceed 60°C;
[0045] b. After the addition of sulfuric acid, open the steam valve, heat up to 93-103°C within 30-40 minutes, and keep it warm for 90 minutes;
[0046] c. After the heat preservation is over, cool down to 60°C, add 4% enhancer, and stir for 15 minutes;
[0047] d. Reduce the temperature to 50°C, pass through the upper tank, and add 42% water;
[0048] e. After adding water, add 1.5% regulator and continue stirring for 15 minutes;
[0049] f. Cool down to 40°C, take samples and send them to the laboratory for inspection. After passing the test, measure and pack them into storage.
[0050] Description: The phenol sulfonic acid curing agent synthesized by this method is a slow curing agent, which is suitable for the production of fur...
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