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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 and use of curing agents are relatively random, and the quality of molding production fluctuates greatly.

Method used

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Experimental program
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preparation example Construction

[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 by weight or weight percentage. The weight percent of raw materials used in the method of the present invention is: sulfuric acid: 27%-52%; phenol: 15%-22%; reinforcing agent: 3%-7%; regulator: 0.5%-2%; water: 25%-46%. The total amount of each raw material is 100%.

[0024] The method comprises the steps of:

[0025] a. Add phenol into the reaction kettle, start the mixer, slowly add sulfuric acid through the head tank, control the speed of adding sulfuric acid, so that the temperature of the material in the reaction kettle does not exceed 60°C;

[0026] b. After adding sulfuric acid, open the steam valve, heat up to 93-103°C within 30-40 minutes, and keep the temperature for 90 minutes;

[0027] c. At the end of the heat preservation, lower the t...

Embodiment 1

[0036] a. Add 22% phenol into the reactor, start the mixer, slowly add 27% sulfuric acid through the head tank, and control the adding speed of sulfuric acid so that the temperature of the material in the reactor does not exceed 60°C;

[0037] b. After adding sulfuric acid, open the steam valve, heat up to 93-103°C within 30-40 minutes, and keep the temperature for 90 minutes;

[0038] c. At the end of the heat preservation, cool down to 60°C, add 3% enhancer, and stir for 15 minutes;

[0039] d. The temperature is lowered to 50°C, and 46% of water is added through the elevated tank;

[0040] e. After adding water, add 2% regulator and continue to stir for 15 minutes;

[0041] f. Cool down to 40°C, take a sample and send it to the laboratory for testing. After passing the test, measure and pack it into the warehouse.

[0042] Explanation: The phenolsulfonic acid curing agent synthesized by this method is an extremely slow curing agent, suitable for furan resin sand molding p...

Embodiment 2

[0044] a. Add 20% phenol into the reaction kettle, start the mixer, slowly add 32.5% sulfuric acid through the head tank, and control the adding speed of sulfuric acid so that the temperature of the material in the reaction kettle does not exceed 60°C;

[0045] b. After adding sulfuric acid, open the steam valve, heat up to 93-103°C within 30-40 minutes, and keep the temperature for 90 minutes;

[0046] c. At the end of the heat preservation, cool down to 60°C, add 4% enhancer, and stir for 15 minutes;

[0047] d. The temperature is lowered to 50°C, and 42% of water is added through the elevated tank;

[0048] e. After adding water, add 1.5% regulator and continue to stir for 15 minutes;

[0049] f. Cool down to 40°C, take a sample and send it to the laboratory for testing. After passing the test, measure and pack it into the warehouse.

[0050] Explanation: The phenolsulfonic acid curing agent synthesized by this method is a slow curing agent, suitable for furan resin sand ...

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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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