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A kind of production method of rapid overall hardening furan resin

A technology of furan resin and production method, which is applied in the direction of casting molding equipment, molds, cores, etc., can solve problems such as not being overcome, and achieve the effects of improving production efficiency, uniform molecular weight distribution, and high activity

Active Publication Date: 2017-09-22
共享新材料(山东)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, there is no method to overcome the above defects

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Embodiment one: a kind of production method of rapid bulk hardening furan resin, the method is as follows:

[0018] Put 200kg of formaldehyde and 180kg of furfuryl alcohol into the reaction kettle, add 50% mixed acid of formic acid and acetic acid to pH = 3.0, heat to 96°C, keep warm for 4 hours, vacuum dehydrate 126kg, add urea 146kg, heat up to 100°C, Insulate and react for 30 minutes, add 600kg of furfuryl alcohol, raise the temperature to 102°C, react for 1.1h, cool down and discharge.

Embodiment 2

[0019] Embodiment two: a kind of production method of rapid bulk hardening furan resin, the method is as follows:

[0020] Put 220kg of formaldehyde and 210kg of furfuryl alcohol into the reactor, add 50% mixed acid of formic acid and acetic acid to pH = 3.2, heat to 98°C, keep warm for 4.5 hours, vacuum dehydrate 138.6kg, add urea 128kg, heat up to 102°C , heat preservation reaction for 35 minutes, add 580kg of furfuryl alcohol, rise to 103°C, react for 1.3h, cool down and discharge.

Embodiment 3

[0021] Embodiment three: a kind of production method of rapid bulk hardening furan resin, the method is as follows:

[0022] Put 240kg of formaldehyde and 240kg of furfuryl alcohol into the reaction kettle, add 50% mixed acid of formic acid and acetic acid to pH = 3.5, heat to 100°C, keep warm for 5 hours, vacuum dehydrate 151kg, add urea 81kg, heat up to 100°C, Insulate and react for 40 minutes, add 590kg of furfuryl alcohol, rise to 105°C, react for 1.2h, cool down and discharge.

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PUM

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Abstract

The present invention relates to a production method of furan resin, in particular to a production method of rapid integral hardening furan resin, the method comprises the following steps: feeding formaldehyde and furfuryl alcohol into a reaction vessel, adding mixed organic acid, and adjusting the pH to 3.0 ‑3.5, heat up to 96‑102°C, react for 4‑5 hours, and then remove the moisture brought in by formaldehyde in a vacuum, thereby generating a furfuryl alcohol primary polymer containing 2,5‑dimethylolfuran; directly add urea and heat up to 100-102°C, keep warm for 30-40 minutes; add furfuryl alcohol, heat up to 102-105°C, keep warm for 1-1.5 hours, cool down and discharge; the method of the invention is unique, and the produced product has uniform molecular weight distribution and high activity , Realize rapid overall hardening of furan resin sand molds and improve production efficiency.

Description

technical field [0001] The invention relates to a production method of furan resin, in particular to a production method of rapid overall hardening furan resin. Background technique [0002] The production process of urea-formaldehyde furan resin is generally divided into two steps. The first step is the addition reaction of urea and formaldehyde under alkaline conditions, mainly to obtain dimethylol urea; the second step is to add furfuryl alcohol to carry out polymerization reaction under acidic conditions. Form the condensation products of furfuryl alcohol and hydroxymethyl urea, and finally add free furfuryl alcohol to adjust the viscosity. Since the urea-formaldehyde reaction produces more low-activity by-products besides dihydroxymethylurea, the proportion of small-molecule resins in the products produced by this method is relatively high, and at the same time, the low-activity small-molecule substances shield the hydroxyl of furfuryl alcohol. Methyl groups lead to lo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G16/02B22C1/22
Inventor 马文王娟娟
Owner 共享新材料(山东)有限公司