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Preparation method of low-furfuryl-alcohol-content high-strength furan resin

A furan resin, high-strength technology, applied in the field of preparation of high-strength furan resin, can solve the problems of sand mold collapse, resin high-temperature performance surplus, regeneration difficulties, etc., to achieve the effect of improving high-temperature collapse and reducing casting costs

Active Publication Date: 2016-06-15
GANSU KOCEL CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in actual production, increasingly advanced coating systems can bring better and better high temperature resistance on the surface of the sand mold. The high temperature performance of the resin itself is not only more and more abundant, but also begins to appear redundant, because too high high temperature strength is not conducive to the sand mold. Collapsing, making it difficult to regenerate

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Ⅰ. Stir 500 kg of furfuryl alcohol and 2 kg of silane KH602 in a stirred tank and react at 30°C for 6 hours to form a small molecule initial polymer of furfuryl alcohol, which is released for use;

[0030] Ⅱ. Add 165 kg of urea and 185 kg of formaldehyde in a 1-ton resin reactor, and react to completion under alkaline conditions for about 2 hours;

[0031] Ⅲ. After completion of the reaction, add 150 kilograms of furfuryl alcohol small molecular initial polymers in step I, and react to complete under acidic conditions for about 2 hours;

[0032] Ⅳ. After completion of the reaction, add the furfuryl alcohol small molecular initial polymer in 150 kilograms of steps I, turn off the steam, and stir for 1h;

[0033] Ⅴ. cooling water is cooled to 60 DEG C, add 200 kilograms of furfuryl alcohol small molecular primary polymers in step I, stir evenly;

[0034] VI. Add 75 kg of water and 75 kg of methanol.

[0035] The product is tested according to the national standard "JBT7...

Embodiment 2

[0037] Ⅰ. Stir 570 kg of furfuryl alcohol and 2.5 kg of silane KH550 in a stirred tank and react at 40°C for 4 hours to form a small molecule initial polymer of furfuryl alcohol, which is released for use;

[0038] Ⅱ. Add 170 kg of urea and 180 kg of formaldehyde to a 1-ton resin reactor, and react completely under alkaline conditions for about 2 hours;

[0039] Ⅲ. After completion of the reaction, add 190 kilograms of furfuryl alcohol small molecular initial polymers in step I, and react to complete under acidic conditions for about 2 hours;

[0040] Ⅳ. after completion of the reaction, add the furfuryl alcohol small molecular initial polymer in 190 kilograms of steps I, turn off the steam, and stir for 1.5h;

[0041] Ⅴ. cooling water is cooled to 65 DEG C, add the furfuryl alcohol small molecular initial polymer in 190 kilograms of steps I, stir;

[0042] VI. Add 50 kg of water and 30 kg of methanol.

[0043] The product is tested according to the national standard "JBT752...

Embodiment 3

[0045] Ⅰ. Stir 600 kg of furfuryl alcohol and 3 kg of silane KH602 in a stirred tank and react at 50°C for 2 hours to form a small molecule initial polymer of furfuryl alcohol, which is released for later use;

[0046] Ⅱ. Add 148 kg of urea and 152 kg of formaldehyde to a 1-ton resin reactor, and react to completion under alkaline conditions for about 2 hours;

[0047] Ⅲ. After completion of the reaction, add 200 kg of furfuryl alcohol small molecular initial polymer in step I, and react to complete under acidic conditions for about 2 hours;

[0048] Ⅳ. After completion of the reaction, add 200 kilograms of furfuryl alcohol small molecular initial polymers in the step I, turn off the steam, and stir for 2h;

[0049] Ⅴ. cooling water is cooled to 70 DEG C, add 200 kilograms of furfuryl alcohol small molecular primary polymers in step I, stir evenly;

[0050] VI. Add 50 kg of water and 50 kg of methanol.

[0051] The product is tested according to the national standard "JBT752...

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Abstract

The invention provides a preparation method of a low-furfuryl-alcohol-content high-strength furan resin. The preparation method comprises the following steps: uniformly mixing and stirring furfuryl alcohol and a coupling agent, and reacting at certain temperature for a first time period to generate a furfuryl alcohol small-molecule prepolymer; in a reaction vessel, carrying out addition reaction on urea and formaldehyde; after the addition reaction finishes, adding the furfuryl alcohol small-molecule prepolymer which accounts for one third of the total furfuryl alcohol, shutting down the steam, and stirring and cooling for a second time period; cooling, adding the rest of furfuryl alcohol small-molecule prepolymer, and stirring uniformly; and adding a solvent for dilution, cooling to normal temperature, and discharging. On the premise of lowering the furfuryl alcohol content of the furan resin, a special technique is utilized to keep the normal-temperature strength of the resin product unchanged, thereby lowering the casting cost and enhancing the high-temperature collapsibility of the resin sand mold.

Description

technical field [0001] The invention belongs to the field of casting auxiliary materials, and more specifically relates to a preparation method of high-strength furan resin with low furfuryl alcohol content. Background technique [0002] Furan resin is a common foundry resin at home and abroad. It is generally synthesized by polymerization reaction of furfuryl alcohol with urea, formaldehyde, phenol, etc. The strength of furan resin increases with the increase of furfuryl alcohol content. Large-scale castings require high-strength resin. Many foundries require that the standard 24-hour strength of furan resin should not be less than 2.0Mpa. To achieve this strength, the furfuryl alcohol content in the resin must reach at least 70%. [0003] Furfuryl alcohol not only provides strength at room temperature, but because its molecular structure contains furan rings, it has high temperature stability. Therefore, furfuryl alcohol plays a major role in the high temperature strength...

Claims

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Application Information

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IPC IPC(8): C08G16/02
CPCC08G16/02
Inventor 马文韩文邢金龙
Owner GANSU KOCEL CHEM
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