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

Active Publication Date: 2017-06-23
GANSU KOCEL CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The industry pays far less attention to the quality of curing agents than furan resins. The selection a

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[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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PUM

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Abstract

The invention provides a matched curing agent for casting furan resin and a preparing method thereof. The method comprises: a, adding phenol into a reaction kettle, starting a stirrer, and adding sulfuric acid slowly to enable a material temperature in the reaction kettle to not exceed 60 DEG C; b, after the sulfuric acid is added, opening a steam valve, rising the temperature to 93-103 DEG C and timing and performing heat preservation; c, ending the heat preservation and cooling to 60 DEG C, and adding a fortifier and stirring; d, cooling to 50 DEG C and adding water; e, after the water adding is finished, adding a regulator and continuing to stir; f, cooling to 40 DEG C, sampling for inspection, and metering, packaging and putting into storage after the inspection is qualified. A phenolsulfonic acid curing agent generated by the preparing method can realize batch production, and usable time, hardening and strength of a sand mould all meet use requirements on site.

Description

technical field [0001] The invention relates to a method for preparing a curing agent for casting, in particular to a curing agent for casting furan resin with high catalytic activity and a preparation method thereof. Background technique [0002] No-hardening furan resin sand has been popularized and applied in foundry production for more than 50 years, and furan resin is also the most widely used casting resin in foundry production so far. In the curing stage of the resin, a strong acid curing agent must be introduced to finally complete the cross-linking polycondensation of the resin and cure the sand molding. [0003] At present, sulfonic acid curing agents are the most widely used in furan resin sand casting, including benzenesulfonic acid, toluenesulfonic acid, xylenesulfonic acid, etc. In order to reduce production costs, some foundry manufacturers also use methyl sulfate, ethyl sulfate, etc. for curing agent, or mix and match with sulfuric acid ester curing agent an...

Claims

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Application Information

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IPC IPC(8): B22C1/22
CPCB22C1/224
Inventor 韩文崔刚马文张茜
Owner GANSU KOCEL CHEM
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