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Curing agent for Furane self-hardening resin, preparation method thereof and Furane self-hardening resin sand

A furan no-bake and curing agent technology, which is applied in the field of furan no-bake resin sand and furan no-bake resin curing agent, can solve the problems of expensive raw materials and high production cost of curing agent, achieve good collapsibility, moderate curing speed, and source wide effect

Active Publication Date: 2012-06-27
JINAN SHENGQUAN GROUP SHARE HLDG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The invention provides a curing agent for furan no-bake resin and its preparation method, which solves the problems of expensive raw materials and high production cost of curing agent in the prior art

Method used

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  • Curing agent for Furane self-hardening resin, preparation method thereof and Furane self-hardening resin sand

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preparation example Construction

[0026] In a typical implementation of the present invention, a kind of preparation method of curing agent for furan no-bake resin, comprises the following steps: take the industrial product produced in the process of producing benzenesulfonic acid, p-toluenesulfonic acid or xylenesulfonic acid One, two or mixtures of waste acids are made into mother liquor, and the curing agent is prepared by using the mother liquor.

[0027] The curing agent for furan no-bake resin provided by the present invention is mainly composed of one, two or three mixtures of industrial waste acids produced in the process of producing benzenesulfonic acid, p-toluenesulfonic acid or xylenesulfonic acid, Even use only this spent acid as curing agent. When only this waste acid is used as the curing agent, the curing agent can be obtained by simply collecting the industrial waste acid produced in the process of producing benzenesulfonic acid, p-toluenesulfonic acid or xylenesulfonic acid and mixing them. ...

Embodiment 1

[0041] Raw materials: 57% sulfonic acid concentration, 10% sulfuric acid concentration mother liquor: 100g; 98% sulfuric acid concentration: 50g; xylene: 10g; methanol: 10g; water: 5g.

[0042] Add the mother liquor to a three-necked flask equipped with a thermometer, a stirring paddle and a vacuum dehydration device, dehydrate at 100°C for 1 hour under vacuum conditions, cool to 80°C, add 98% sulfuric acid, xylene, and react at 110°C After 4 hours, cool to 60°C and add methanol. At this time, the temperature is 50°C. React for 1.0 hour, then cool to 40°C, add water, mix well, and discharge to obtain curing agent sample 1.

Embodiment 2

[0044] Raw materials: mother liquor with 45% sulfonic acid concentration and 30% sulfuric acid concentration: 50g; oleum: 45g; toluene: 20g; xylene: 20g; water: 40g.

[0045] Add the mother liquor into a three-neck bottle equipped with a thermometer, a stirring paddle and a vacuum dehydration device, dehydrate at 150°C for 1.5 hours under vacuum conditions, cool to 50°C, and replace the vacuum dehydration device with a normal pressure water separator. Add fuming sulfuric acid, toluene, and xylene, and react at 105°C for 4 hours. Water is continuously separated during the reaction. When no more water is separated from the water separator, the reaction is terminated, and benzene is removed under reduced pressure. Cool to 50°C, add water, mix evenly, and discharge to obtain curing agent sample 2.

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Abstract

The invention discloses a curing agent for Furane self-hardening resin, a preparation method thereof, and Furane self-hardening resin sand. The raw material of the curing agent comprises mother liquor and water, and the mother liquor is industrial waste acid produced during the production process of benzene sulfonic acid, p-toluenesulfonic acid and xylenesulfonic acid. The mother liquor in the raw material used for preparing the curing agent is wide in source and low in cost and can remarkably reduce the manufacturing cost of the curing agent for Furane self-hardening resin; compared with the curing agent prepared by using the traditional method, the curing agent prepared by using the method in the invention has the advantages as follows: the differences are not great, and even the curing agent is superior to the traditional curing agent; the curing agent provided in the invention can be used for solidifying the Furane self-hardening resin sand, has a weak smell during a sand mulling process, is moderate in solidifying speed, is high in sand mold and core strength after being poured, has excellent mold and core collapsibility and ensures that old sand can be reproduced easily. The preparation method provided by the invention is simple in process and is shorter in period.

Description

technical field [0001] The invention relates to the field of curing agents, in particular to a curing agent for furan no-setting resin, a preparation method thereof and furan no-setting resin sand. Background technique [0002] The furan no-bake resin sand process is often used in the foundry industry. The curing agent used in it is generally divided into two types: organic curing agent and inorganic curing agent. The inorganic curing agent includes sulfuric acid, phosphoric acid and sulfuric acid ester. Among them, the acidity of sulfuric acid is too strong. When used for resin sand curing, the reaction is too strong, so that the final strength is too low; Phosphoric acid is generated and deposited in the reclaimed sand when the resin sand is regenerated, and the use of inorganic curing agents mixed with reclaimed sand will cause the strength of the resin sand to decrease. affect the quality of castings. The organic curing agent is various aromatic hydrocarbon sulfonic aci...

Claims

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Application Information

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IPC IPC(8): B22C1/10
Inventor 唐一林江成真胡廷峰焦芬
Owner JINAN SHENGQUAN GROUP SHARE HLDG
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