Method for preparing self-solidified furan resin for casting by amyl saccharide compound instead of furfuryl alcohol

A furan resin and compound technology, which is applied in casting molding equipment, casting molds, manufacturing tools, etc., can solve the problems of high production costs, achieve the effects of reducing hazards, reducing production costs, and increasing cross-linking points

Active Publication Date: 2013-01-23
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

[0025] Raw material composition:

[0026] Formaldehyde (concentration 37%) 170Kg (17 parts), urea 80Kg (8 parts), furfuryl alcohol 560Kg (56 parts), xylose 100Kg (10 parts).

[0027] The method for producing no-hardening furan resin for foundry by pentose compounds described in this embodiment instead of furfuryl alcohol comprises the following steps:

[0028] (1) Add 17 parts of formaldehyde to the reaction kettle, adjust the pH to 9.2-9.4 with dilute sodium bicarbonate solution to react, then add 10 parts of xylose, and control the temperature at 90-95°C for 1 hour;

[0029] (2) Add 6 parts of urea to the reactor while it is hot to dissolve and stir evenly, then add 18 parts of furfuryl alcohol for reaction, and adjust the pH value of the system to 4.8-5.0 with 20% hydrochloric acid solution, and control the reaction temperature at 90-95°C for reaction 1.5h;

[0030] (3) Add 2 parts of urea to the reactant obtained in step (2) again, adjust the pH value of the material sys...

Embodiment 2

[0033] Raw material composition:

[0034] Formaldehyde (concentration 37%) 150Kg (15 parts), urea 90Kg (9 parts), furfuryl alcohol 550Kg (55 parts), a mixture of arabinose and xylitol 200 Kg (20 parts).

[0035] The method for producing no-hardening furan resin for foundry by pentose compounds described in this embodiment instead of furfuryl alcohol comprises the following steps:

[0036] (1) Add 20 parts of formaldehyde with a concentration of 37% to the reaction kettle, adjust the pH to 9.2-9.4 with dilute sodium hydroxide solution for reaction, then add 20 parts of arabinose, and control the temperature at 85-90°C for 1 hour;

[0037] (2) Add 6 parts of urea to the reactor while it is hot to dissolve and stir evenly, then add 15 parts of furfuryl alcohol for reaction, and adjust the pH value of the system to 2.5-3.5 with 15% oxalic acid solution, and control the reaction temperature at 85-90°C for reaction 1.5h;

[0038] (3) Add 3 parts of urea to the reactant obtained in...

Embodiment 3

[0041] Raw material composition:

[0042] POM solution (concentration 37%) 220Kg (22 parts), urea 60Kg (6 parts), furfuryl alcohol 600Kg (60 parts), xylitol 50 Kg (5 parts).

[0043] The method for producing no-hardening furan resin for foundry by replacing furfuryl alcohol with pentose compounds described in this embodiment is characterized in that it comprises the following steps:

[0044](1) Add 22 parts of polyoxymethylene solution with a concentration of 37% to the reaction kettle, adjust the pH to 9.5-9.7 with a dilute sodium carbonate solution and raise the temperature to 85°C for 1 hour, then add 5 parts of xylitol, and control the temperature at 80- Reaction at 85°C for 1h;

[0045] (2) Add 5 parts of urea to the reactor while it is hot to dissolve and stir evenly, then add 20 parts of furfuryl alcohol for reaction, and adjust the pH value of the system to 4.0-4.5 with 10% sulfuric acid solution, and control the reaction temperature to 80-85°C for reaction 1.5h;

...

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Abstract

The invention relates to a preparation method of self-solidified furan resin for casting, and particularly relates to a preparation method for preparing the self-solidified furan resin for casting by amyl saccharide compound part instead of furfuryl alcohol as a material. According to the method disclosed by the invention, 5-35 parts of amyl saccharide compounds and 50-60 parts of furfuryl alcohol are combined as materials to replace a large quantity of furfuryl alcohol required in the prior art, so that the dosage of the furfuryl alcohol is reduced. Compared with the production of the traditional furan resin, the preparation method has the advantages that the production cost is reduced, the harm on the environment is reduced, and large-scale production is facilitated. Meanwhile, an aldehyde group and a polyhydroxy structure contained in an amyl saccharide compound molecule are utilized; a resin curing crosslinked point is increased in a process of preparing the furan resin; the situation that the resin forms a mesh structure in a curing process is facilitated; 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 preparation method of no-hardening furan resin for casting, in particular to a method for preparing no-hardening furan resin for casting by using pentose part instead of furfuryl alcohol as raw material to modify and produce no-hardening furan resin for casting. 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, sa...

Claims

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Application Information

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