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Method for producing self-hardening furan resin for casting with pentose compound instead of furfuryl alcohol

A furan resin and compound technology, which is applied in casting molding equipment, casting molds, manufacturing tools and other directions, can solve the problem of high production cost, and achieve the effects of reducing the hazard, reducing the content, and being beneficial to large-scale production.

Active Publication Date: 2013-01-16
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 250Kg (25 parts), urea 100Kg (10 parts), furfuryl alcohol 550Kg (55 parts), xylose 350Kg (35 parts).

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

[0028] (1) Add 25 parts of formaldehyde with a concentration of 37% and 8 parts of urea into the reaction kettle and stir evenly. After the urea is dissolved, adjust the pH to 9.0-9.2 with sodium hydroxide solution to react for 1 hour;

[0029] (2) Then add 20 parts of furfuryl alcohol for reaction, adjust the pH value of the system to 2.5-3.5 with 10% sulfuric acid solution, and control the reaction temperature at 90-95°C for 1.5 hours;

[0030] (3) Add 2 parts of urea to the reactant obtained in step (2) again, and adjust the pH value of the material system to 7.8-8.0 with sodium carbonate solution, control the reaction temperature at...

Embodiment 2

[0033] Raw material composition:

[0034] Formaldehyde (concentration 37%) 200Kg (20 parts), urea 110Kg (11 parts), furfuryl alcohol 500 Kg (50 parts), a mixture of arabinose and xylitol 300 Kg (30 parts).

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

[0036] (1) Add 20 parts of formaldehyde with a concentration of 37% and 8 parts of urea into the reaction kettle and stir evenly. After the urea is dissolved, adjust the pH to 9.2-9.6 with dilute sodium bicarbonate solution and heat up to 85°C for 1 hour of reaction;

[0037] (2) Then add 15 parts of furfuryl alcohol for reaction, adjust the pH value of the system to 4.0-4.5 with 20% hydrochloric acid solution, and control the reaction temperature at 95-100°C for 1.5 hours;

[0038] (3) Add 3 parts of urea to the reactant obtained in step (2) again, and adjust the pH value of the materia...

Embodiment 3

[0041] Raw material composition:

[0042] POM solution (concentration 37%) 150Kg (15 parts), urea 90Kg (9 parts), furfuryl alcohol 550Kg (55 parts), xylitol 200 Kg (20 parts).

[0043] The method for producing no-hardening furan resin for foundry with pentose compound instead of furfuryl alcohol described in the present embodiment comprises the following steps:

[0044](1) Add 20 parts of polyoxymethylene solution with a concentration of 37% and 6 parts of urea into the reaction kettle and stir evenly. After the urea is dissolved, adjust the pH to 9.6-10.0 with dilute sodium bicarbonate solution and heat up to 85°C for 1 hour of reaction;

[0045] (2) Then add 15 parts of furfuryl alcohol for reaction, adjust the pH of the system to 4.8-5.0 with 25% oxalic acid solution, and control the reaction temperature at 85-90°C for 1.5 hours;

[0046] (3) Add 3 parts of urea to the reactant obtained in step (2) again, adjust the pH value of the material system to 7.5-8.5 with a dilute ...

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Abstract

The invention relates to a method for producing self-hardening furan resin for casting, in particular to a method for producing self-hardening furan resin for casting by taking a pentose compound as a raw material to substitute for part of furfuryl alcohol. According to the method, 5-35 parts of pentose compound and 50-60 parts of furfuryl alcohol are used as raw materials combination to replace a large quantity of furfuryl alcohol required in the prior art, so that the using quantity of the furfuryl alcohol is reduced. Compared with the traditional method for producing furan resin, the method provided by the invention has the advantages that production cost is lowered, harm to environments is reduced, and the method is favorable to large scale production; and meanwhile, in the preparation process of the furan resin, an aldehyde and polyhydroxy structure in the molecule of the pentose compound is utilized to increase resin curing crosslinking points and facilitate the formation of a reticular structure in the 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 preparation method of no-hardening furan resin for casting, in particular to a method for preparing no-hardening furan resin for foundry by using pentose compounds as raw materials instead of furfuryl alcohol. 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, and is an excellent preser...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G16/02B22C1/22
Inventor 祝建勋刘昭荐尹义芹
Owner JINAN SHENGQUAN GROUP SHARE HLDG
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