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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AI-Extracted 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 ...

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.

Technology Topic

SolventPrepolymer +7

Examples

Experimental program(3)

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 standard "JBT7526-2008 self-hardening furan resin for foundry", the resin product strength can reach 1.8Mpa, which is higher than the 1.3Mpa of the traditional process product with the same furfuryl alcohol content.

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 to the national standard "JBT7526-2008 self-hardening furan resin for foundry". The strength of the resin product can reach 2.0Mpa, which is higher than the 1.5Mpa of the traditional process product with the same furfuryl alcohol content.

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 to the national standard "JBT7526-2008 self-hardening furan resin for foundry", and the strength of the resin product can reach 2.1Mpa, which is higher than the 1.6Mpa of the traditional process product with the same furfuryl alcohol content.

PUM

Property	Measurement	Unit
Strength	1.8	mPa
Strength	2.0	mPa
Strength	2.1	mPa

Description & Claims & Application Information

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Classification and recommendation of technical efficacy words

Reduce casting costs

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

AI-Extracted Technical Summary

Problems solved by technology

Abstract

Examples

Example Embodiment

Example Embodiment

Example Embodiment

PUM

Description & Claims & Application Information

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