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

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0028] Example one:

[0029] Ⅰ. Mix 500 kilograms of furfuryl alcohol and 2 kilograms of silane KH602 in a stirred tank, and then react at 30°C for 6 hours to generate small-molecule primary polymers of furfuryl alcohol, which are released for use;

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

[0031] Ⅲ. After the reaction is completed, add 150 kg of the small-molecule furfuryl alcohol primary polymer in step I, and react to completion under acidic conditions, about 2 hours;

[0032] Ⅳ. After the reaction is completed, add 150 kg of the small-molecule furfuryl alcohol primary polymer in step I, turn off the steam, and stir for 1 hour;

[0033] Ⅴ. Cool to 60℃ with cooling water, add 200 kg of the small-molecule furfuryl alcohol primary polymer in step I, and stir evenly;

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

[0035] The product is tested according to the national stand...

Example Embodiment

[0036] Embodiment two:

[0037] Ⅰ. Mix 570 kilograms of furfuryl alcohol and 2.5 kilograms of silane KH550 in a stirred tank, and then react at 40°C for 4 hours to generate small-molecule primary polymers of furfuryl alcohol, which will be released for later use;

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

[0039] Ⅲ. After the reaction is completed, add 190 kg of the small-molecule furfuryl alcohol primary polymer in step I, and react to completion under acidic conditions, about 2 hours;

[0040] Ⅳ. After the reaction is complete, add 190 kg of the small-molecule furfuryl alcohol primary polymer in step I, turn off the steam, and stir for 1.5h;

[0041] Ⅴ. Cool to 65℃ with cooling water, add 190 kg of furfuryl alcohol small molecule primary polymer in step I, and stir evenly;

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

[0043] The product is tested according ...

Example Embodiment

[0044] Embodiment three:

[0045] Ⅰ. Mix 600 kilograms of furfuryl alcohol and 3 kilograms of silane KH602 in a stirred tank, and then react at 50°C for 2 hours to react to produce furfuryl alcohol small molecule primary polymers, which are released for use;

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

[0047] Ⅲ. After the reaction is completed, add 200 kg of the small-molecule furfuryl alcohol primary polymer in step I, and react to completion under acidic conditions, about 2 hours;

[0048] Ⅳ. After the reaction is completed, add 200 kg of the small-molecule furfuryl alcohol primary polymer in step I, turn off the steam, and stir for 2 hours;

[0049] Ⅴ. Cool to 70℃ with cooling water, add 200 kg of furfuryl alcohol small molecule primary polymer in step I, and stir evenly;

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

[0051] The product is tested according t...

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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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