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Method for preparing self-hardening furan resin for casting and mother liquor

A furan resin, self-hardening technology, applied in casting molding equipment, casting molds, manufacturing tools, etc., can solve the problems of production efficiency, high furfuryl alcohol addition, furan resin, etc., to achieve high production efficiency, low price, No secondary pollution effect

Inactive Publication Date: 2012-12-05
PINGGAO GRP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this preparation method, the amount of furfuryl alcohol is 89-93%, and the prepared furan resin is a high-furan resin (furfuryl alcohol content greater than 80%), but it cannot be used for the preparation of medium furan resin (furfuryl alcohol content is 60-80%) and low-furan resin. Furan resin (furfuryl alcohol content less than 60% and greater than 40%), it is difficult to obtain furan resin with different furfuryl alcohol content according to needs; moreover, furfuryl alcohol needs to be added in batches during heating, synthesis and discharging, which will cause the addition of furfuryl alcohol to be biased. High, which affects the production efficiency; and the synthesis process requires dehydration, which is easy to cause secondary pollution

Method used

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  • Method for preparing self-hardening furan resin for casting and mother liquor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] The self-hardening furan resin mother liquor of the present embodiment adopts 10% by weight of acetone, 18% of phenol, 18% of solid formaldehyde, 4% of urea, and 50% of furfuryl alcohol as the main raw materials. The specific preparation method is as follows:

[0020] Prepared as follows:

[0021] 1) Add 10% acetone, 18% phenol, 18% solid formaldehyde and 2% urea (50% of the total urea) into the reactor, adjust the pH to 7.0 with sodium hydroxide, and react at 70°C for 1 hour ;

[0022] 2) Add 50% furfuryl alcohol when the system is cooled below 80°C, adjust the pH to 4.0 with phosphoric acid, and react at 80°C for 1.5 hours;

[0023] 3) Adjust the pH to 7.0 with sodium hydroxide, add the remaining 2% urea, and react at 80°C for 0.5 hours;

[0024] 4) Lower the temperature to below 40°C to obtain the no-bake furan resin mother liquor.

[0025] The no-bake furan resin for casting in this example adopts the following method, using 40% of the no-bake furan resin mother ...

Embodiment 2

[0027] The self-hardening furan resin mother liquor of the present embodiment is prepared by using 16% by weight of acetone, 30% of phenol, 13% of solid formaldehyde, 0.5% of urea, and 40.5% of furfuryl alcohol as main raw materials. The specific preparation method is as follows:

[0028] Prepared as follows:

[0029] 1) Add 16% acetone, 30% phenol and 13% solid formaldehyde into the reaction kettle, adjust the pH to 7.5 with sodium hydroxide, and react at 80°C for 1.8 hours;

[0030] 2) Add 40.5% furfuryl alcohol after the system cools down to below 80°C, adjust the pH to 5.0 with phosphoric acid, and react at 95°C for 2 hours;

[0031] 3) Adjust the pH to 7.0 with sodium hydroxide, add 0.5% urea, and react at 80°C for 0.5 hours;

[0032] 4) Lower the temperature to below 40°C to obtain the no-bake furan resin mother liquor.

[0033] The no-bake furan resin for casting in this example adopts the following method, using 20% ​​of the no-bake furan resin mother liquor prepared...

Embodiment 3

[0035] The self-hardening furan resin mother liquor of the present embodiment adopts 12% by weight of acetone, 16% of phenol, 25% of solid formaldehyde, 12% of urea, and 35% of furfuryl alcohol as main raw materials. The specific preparation method is as follows:

[0036] Prepared as follows:

[0037] 1) Add 12% acetone, 16% phenol, 25% solid formaldehyde and 9% urea (accounting for 75% of the total urea) into the reactor, adjust the pH to 8.0 with sodium hydroxide, and react at 90°C for 1 ~3 hours;

[0038] 2) Add 35% furfuryl alcohol after the system cools down to below 80°C, adjust the pH to 4.5 with phosphoric acid, and react at 100°C for 3 hours;

[0039] 3) Adjust the pH to 7.5 with sodium hydroxide, add the remaining 3% urea, and react at 85°C for 0.8 hours;

[0040] 4) Lower the temperature to below 40°C to obtain the no-bake furan resin mother liquor.

[0041] The no-bake furan resin for casting in this example adopts the following method, using 79.6% of the no-bak...

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Abstract

The invention discloses a method for preparing a self-hardening furan resin for casting and mother liquor. Acetone, phenol, solid formaldehyde, urea and furfuryl alcohol are used as raw materials to be subjected to an addition reaction, a polycondensation reaction and other steps to prepare the furan resin mother liquor. The mother liquor and the furfuryl alcohol with substantially adjustable amount are matched with an enhancer to be stirred conventionally to obtain the self-hardening furan resin for casting. According to the preparation method of the self-hardening furan resin for casting, the preparation process is quick and simple, the production efficiency is high, the labor intensity is low, the furfuryl alcohol content of the resin has strong controllability and wider adjustment range, and is suitable for preparing industrially applied high furan resins, medium furan resins and low furan resins, and thus the method is suitable for industrial popularization and application.

Description

technical field [0001] The invention relates to a preparation method of no-hardening furan resin mother liquor and no-hardening furan resin for casting, and belongs to the technical field of resin material preparation. Background technique [0002] Furan resin is a kind of thermosetting resin containing furan ring in the structure, which is made of furfuryl alcohol and phenol, urea or various aldehyde modified furfuryl alcohol. No-bake furan resin for casting is one of them. Generally, no-bake furan resin for casting Furan resin is light yellow to brown transparent or translucent homogeneous liquid. No-bake furan resin for foundry can harden the sand mold (core) through acid catalysis at room temperature. It is the most commonly used and most widely used binder in the foundry industry. It is characterized by simple molding (core) and collapse of sand mold (core) Good performance, high recycling rate of old sand, high strength of resin sand, low odor. At present, the prepar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G16/00B22C1/22
Inventor 林生军李远才谢美芳
Owner PINGGAO GRP
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