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
4 Cites 6 Cited by

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 ...
View more

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

PropertyMeasurementUnit
Strength1.8mPa
Strength2.0mPa
Strength2.1mPa

Description & Claims & Application Information

We can also present the details of the Description, Claims and Application information to help users get a comprehensive understanding of the technical details of the patent, such as background art, summary of invention, brief description of drawings, description of embodiments, and other original content. On the other hand, users can also determine the specific scope of protection of the technology through the list of claims; as well as understand the changes in the life cycle of the technology with the presentation of the patent timeline. Login to view more.

Similar technology patents

Foundry sand treatment mixing and rolling equipment

ActiveCN109773119Alow costReduce casting costs
Owner:济南市平阴县玛钢厂

Collapse-easy water glass core sand for casting train aluminum alloy castings and preparation method thereof

InactiveCN106077439AImprove casting yieldReduce casting costs
Owner:江阴联华铸造有限公司

Classification and recommendation of technical efficacy words

  • Reduce casting costs

Collapse-easy water glass core sand for casting train aluminum alloy castings and preparation method thereof

InactiveCN106077439AImprove casting yieldReduce casting costs
Owner:江阴联华铸造有限公司

Foundry sand treatment mixing and rolling equipment

ActiveCN109773119Alow costReduce casting costs
Owner:济南市平阴县玛钢厂
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products