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Easy collapsibility furan resin for casting and preparing process thereof

A technology for modifying furan resin and rosin, which is applied to casting molding equipment, casting molds, manufacturing tools, etc. It can solve problems such as hot cracking of castings, lower casting yield, poor collapsibility of furan resin sand, etc., and meet performance requirements and collapse Improve performance and expand the effect of application

Active Publication Date: 2008-06-18
JINAN SHENGQUAN GROUP SHARE HLDG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the high temperature strength of furfuryl alcohol in ordinary furan resin, the furan resin sand has poor collapsibility, and the sand mold has little retreat during the casting process, and the casting is prone to thermal cracking, which reduces the yield of the casting.
Such problems hinder the further application of furan resin in foundry production

Method used

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  • Easy collapsibility furan resin for casting and preparing process thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Raw material composition:

[0016] Formaldehyde (concentration 37%): 176Kg, urea: 100Kg, furfuryl alcohol: 660Kg, wood rosin: 233Kg.

[0017] Reaction steps:

[0018] In the first step, add 660Kg of furfuryl alcohol into the reactor, start stirring, adjust the pH to 1.1-1.4 with 20% oxalic acid solution, add 233Kg of wood rosin, heat up to 74-76°C and react until the viscosity of the material is 35-40 seconds (25°C, 4 #cup viscosity), cooling, adjust PH=6.5~7.5 with 15% sodium hydroxide solution, carry out dehydration under the vacuum state, dehydration is stopped to resin water content below 1.0%, obtain wood rosin modified furfuryl alcohol component about 823Kg stand-by.

[0019] In the second step, add 176Kg of formaldehyde (concentration: 37%) to the reactor, start stirring, add 80Kg of urea in one step, after the urea is dissolved, adjust the pH value to 8.8-9.0 with alkaline solution, heat up to 90±2°C and react for 1 hour; Add wood rosin modified furfuryl alcoh...

Embodiment 2

[0021] Raw material composition:

[0022] Formaldehyde (concentration 37%): 320Kg, urea: 100Kg, furfuryl alcohol: 800Kg, gum rosin: 176Kg.

[0023] Reaction steps:

[0024] In the first step, add 800Kg of furfuryl alcohol into the reaction kettle, start stirring, adjust the pH to 1.8-2.0 with 20% oxalic acid solution, add 176Kg of gum rosin, heat up to 87-90°C and react until the viscosity of the material is 25-30 seconds (25°C, 4 #cup viscosity), cooling, adjust PH=6.5~7.5 with 15% sodium hydroxide solution, carry out dehydration under the vacuum state, dehydration is stopped until the water content of resin is less than 1.0%, obtain about 911Kg of gum rosin modified furfuryl alcohol component and stand-by.

[0025] In the second step, add 320Kg of formaldehyde (concentration: 37%) to the reaction kettle, start stirring, add 80Kg of urea in one step, after the urea is dissolved, adjust the pH value to 8.4-8.6 with alkaline solution, heat up to 85±2°C and react for 1 hour; A...

Embodiment 3

[0027] Formaldehyde (concentration 37%): 270Kg, urea: 100Kg, furfuryl alcohol: 950Kg, tall oil rosin: 150Kg.

[0028] Reaction steps:

[0029] In the first step, add 950Kg of furfuryl alcohol into the reaction kettle, start stirring, adjust the pH to 2.5-2.8 with 20% oxalic acid solution, add 150Kg of tall oil rosin, raise the temperature to 80-83°C and react until the viscosity of the material is 19-23 seconds (25°C, 4# cup viscosity), lower the temperature, adjust PH=6.5~7.5 with 15% sodium hydroxide solution, dehydrate under vacuum state, dehydrate until the water content of the resin is below 1.0%, and stop to obtain about 1030Kg of tall oil rosin modified furfuryl alcohol component for use .

[0030] In the second step, add 270Kg of formaldehyde (concentration: 37%) to the reaction kettle, start stirring, add 80Kg of urea in one step, after the urea is dissolved, adjust the pH value to 8.4-8.6 with alkaline solution, heat up to 85±2°C and react for 1 hour; Add tall oil ...

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Abstract

The invention discloses an furan resin with easy collapsibility used in casting and a preparation method, which is made from a modified rosin. The addition amount of the rosin is 5 to 37 wt percent and is calculated by the total amount of furfuryl alcohol. In the process of synthesizing the furan resin for casting, the modification of the furan resin by adding the rosin can accelerate the heat decomposing speed of the resin; thus the collapsibility of the resin sand is improved and is more suitable for the requirements of the casting production. In the first reaction step in the preparation method when synthesizing the rosin modified furfuryl alcohol, the reaction PH value is 1.0 to 3.0, and the reaction temperature is at 70 DEG C to 90 DEG C; in the second reaction step when synthesizing the furan resin with easy collapsibility, the mol ratio of carbamide and formaldehyde is 1:1.2 to 1:2.4. The obtained easy collapsed furan resin is specialized in casting technology field, and the collapsibility of the resin sand is improved by 30 to 60 percent.

Description

technical field [0001] The invention relates to a modified furan resin and a preparation method thereof, in particular to a collapsible furan resin for casting and a preparation method thereof. Background technique [0002] Furan resin sand is the earliest and most mature molding and core-making process, especially suitable for single-piece, small-batch, medium and large-scale casting production. Its main features are: high strength, high recycling rate of old sand regeneration. In the casting process of casting production, after the resin sand mold is in contact with the molten metal, the resin is decomposed by heat and the strength of the resin sand mold is reduced, which is customarily called the dispersibility of the resin sand in casting. The method for measuring the collapsibility of resin sand is to heat the sample to the specified temperature, wait for it to cool to room temperature, then place it on the vibrating sieve to shake off the sand, and then measure the re...

Claims

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Application Information

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IPC IPC(8): B22C1/02
Inventor 刘昭荐祝建勋
Owner JINAN SHENGQUAN GROUP SHARE HLDG
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