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Method for producing self-hardened furan resin for casting by modifying furfuryl alcohol through pentose compound

A furan resin and compound technology, which is applied in casting molding equipment, casting molds, manufacturing tools, etc., can solve the problem of high production cost, and achieve the effects of reducing hazard, reducing content and saving production cost.

Active Publication Date: 2013-01-09
JINAN SHENGQUAN GROUP SHARE HLDG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] For this reason, the technical problem to be solved by the present invention is that the preparation and production of no-bake furan resin for foundry in the prior art needs to consume a large amount of furfuryl alcohol, which leads to the problem of high production cost, and then provides a kind of pentose compound that partially replaces furfuryl alcohol to produce Method for preparing no-hardening furan resin for casting to reduce production cost

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] Composition of raw materials: formaldehyde 200Kg (20 parts), urea 100Kg (10 parts).

[0046] The method for producing no-hardening furan resin for foundry by modifying furfuryl alcohol with pentose compounds described in this embodiment comprises the following steps:

[0047] (1) Take furfuryl alcohol and adjust the pH to 1.0-1.4 with 20% oxalic acid solution, then add xylose and control the temperature at 75-80°C for reaction until the viscosity of the material reaches 35-40 seconds (25°C, coated with No. 4 viscosity cup Viscosity) stop reaction, the weight ratio of described furfuryl alcohol and described xylose is 50:35,

[0048] (2) Use 15% sodium hydroxide solution to adjust the pH of the reactant obtained in step (1) to 6.5-7.0, and dehydrate under vacuum until the moisture content of the resin is lower than 1.0% to stop the reaction and obtain a sufficient amount of furfuryl alcohol The modified components are ready for use;

[0049] (3) Add 20 parts of formald...

Embodiment 2

[0053] Composition of raw materials: formaldehyde (concentration 37%) 250Kg (25 parts), urea 110Kg (11 parts).

[0054] The method for producing no-hardening furan resin for foundry by modifying furfuryl alcohol with pentose compounds described in this embodiment comprises the following steps:

[0055] (1) Take furfuryl alcohol and adjust the pH to 2.5-3.0 with 20% hydrochloric acid solution, then add a mixture of arabinose and xylitol and react at a temperature of 70-75°C until the viscosity of the material reaches 20-22 seconds (25°C , coating-No. 4 cup viscosity) to stop the reaction, the weight ratio of the mixture of the furfuryl alcohol and the arabinose and xylitol is 60:35;

[0056] (2) Adjust the pH of the reactant obtained in step (1) to 7.0-7.5 with dilute sodium bicarbonate solution, and dehydrate under vacuum until the water content is lower than 1.0% to stop the reaction to obtain a sufficient amount of furfuryl alcohol modified sexual components spare;

[0057...

Embodiment 3

[0061] Composition of raw materials: POM (concentration 37%) 150Kg (15 parts), urea 80Kg (8 parts).

[0062] The method for producing no-hardening furan resin for foundry by modifying furfuryl alcohol with pentose compounds described in this embodiment comprises the following steps:

[0063] (1) Take furfuryl alcohol and adjust the pH to 2.0-2.5 with 10% formic acid solution, then add xylitol and control the temperature at 80-85°C to react until the viscosity of the material reaches 20-22 seconds (25°C, Tu-4 Cup viscosity), stop reaction, the weight ratio of described furfuryl alcohol and described xylitol is 50:5;

[0064] (2) Adjust the pH of the reactant obtained in step (1) to 6.5-7.5 with dilute sodium carbonate solution, and dehydrate under vacuum until the water content is lower than 1.0% to stop the reaction to obtain a sufficient amount of furfuryl alcohol modification spare parts;

[0065] (3) Add 15 parts of polyoxymethylene solution and 6 parts of urea to the rea...

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Abstract

The invention relates to a preparation method of self-hardened furan resin for casting, in particular to a method for producing the self-hardened furan resin for casting by partially modifying furfuryl alcohol through a pentose compound. The method comprises the following steps of: taking the furfuryl alcohol and the pentose compound in a weight ratio of (50-60): (5-35) as raw materials to prepare a furfuryl alcohol modified component to replace a large amount of the furfuryl alcohol needed by the prior art, so that the use amount of the furfuryl alcohol is reduced; compared with the traditional production of the furan resin, the preparation method provided by the invention has the advantages that the production cost is reduced, the damages to an environment are reduced and the large-scale production is easy to realize; meanwhile, pentose compound molecules contain an aldehyde group and a polyhydroxy structure; and in a process of preparing the furan resin, the cross-linking point of resin curing is increased, a net-shaped structure is easy to form in a curing process of the resin, the strength of resin sand is improved and the content of free formaldehyde can be effectively reduced.

Description

technical field [0001] The invention relates to a method for preparing a no-hardening furan resin for casting, in particular to a preparation process for producing a no-hardening furan resin for casting by modifying a part of furfuryl alcohol with a pentose compound as a raw material. Background technique [0002] Furan resin refers to the general term for resins produced from furfuryl alcohol and furfural with a furan ring as raw materials. It solidifies into insoluble and infusible solids under the action of strong acid. The types include furfuryl alcohol resin, furfural resin, furfurone resin, furfurone --Formaldehyde resin, etc. Furfuryl alcohol resin is formed by polycondensation of furfuryl alcohol and formaldehyde (the modified product is added with urea), the appearance is dark brown to black liquid or solid, good heat resistance and water resistance, and strong chemical corrosion resistance , has excellent resistance to acids, alkalis, salts and organic solutions, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22C1/22C08G16/04
Inventor 祝建勋刘昭荐尹义芹
Owner JINAN SHENGQUAN GROUP SHARE HLDG
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