Preparation process of an environment-friendly urea-formaldehyde ketone-based modified furan casting resin

A urea-formaldehyde-ketone-based, preparation process technology, applied in the direction of casting molding equipment, manufacturing tools, casting molds, etc., can solve the problems of high production cost and use cost, increased raw material consumption cost, easy delamination, etc., to reduce consumption cost, The effect of improving quality defects and enhancing solid permeability

Active Publication Date: 2018-06-29
广东省铸力铸材科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to obtain products with low nitrogen content, the conventional method is to add more and more expensive furfuryl alcohol to adjust and reduce the nitrogen content in the product, resulting in higher raw material consumption costs in the production process, and higher urea content in the product Will lead to the following quality defects:
[0003] (1) Resin sand has poor solidity, long curing time and low release strength
[0004] (2) The content of urea-formaldehyde group in the resin is relatively large, which leads to poor moisture resistance of the resin sand, especially in a humid environment, the strength of the sand mold (core) decreases greatly with time, and the sand core is unfavorable for storage and management.
[0005] (3) Too much urea-formaldehyde group content in the resin is unfavorable for storage, and it is easy to delaminate over time, which affects the quality of the product
[0006] (4) High production cost and use cost

Method used

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  • Preparation process of an environment-friendly urea-formaldehyde ketone-based modified furan casting resin
  • Preparation process of an environment-friendly urea-formaldehyde ketone-based modified furan casting resin
  • Preparation process of an environment-friendly urea-formaldehyde ketone-based modified furan casting resin

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] (1) Put 245g of formaldehyde (37% formaldehyde content) in a device equipped with a three-necked flask, stirring, and coiled condenser, add 56g of acetone, and catalyst A to adjust the pH of the material. The pH is controlled within the range of 9.5 to 1.0.

[0038] (2) Addition reaction for 90 minutes at material temperature 80±2℃.

[0039] (3) After the reaction time is up, add 60g of urea, and react for 60 minutes at the material temperature of 80-85°C.

[0040] (4) After the reaction time is up, add 300 g of furfuryl alcohol, add 6 g of catalyst B, control the pH value in the range of 4.0-4.5, and perform the polycondensation reaction for 60 minutes at the material temperature of 100±2°C.

[0041] (5) After the reaction time is up, reduce the temperature of the material to below 85°C, add 3.0g of catalyst C, control the PH value within the range of 7.5-8.0, add 5g of urea, add reaction at 80-85°C for 30 minutes .

[0042] (6) After the reaction time is up, add 1.5 g of melam...

Embodiment 2

[0048] (1) In a 2000L enamel reactor, put 440kg of formaldehyde (37% formaldehyde content), add 100kg of acetone, add catalyst A to adjust the pH value of the material, and the pH value is controlled within the range of 9.5 to 1.0.

[0049] (2) Addition reaction for 90 minutes at material temperature 80±2℃.

[0050] (3) After the reaction time is up, add 108g of urea, and add reaction for 60 minutes at the material temperature of 80-85°C.

[0051] (4) After the reaction time is up, add 540g of furfuryl alcohol, add 11kg of catalyst B, control the PH value in the range of 4.0-4.5, and conduct the polycondensation reaction for 60 minutes at the material temperature of 100±2°C.

[0052] (5) After the reaction time is up, reduce the temperature of the material to below 85℃, add 5.5kg of catalyst C, control the PH value in the range of 7.5-8.0, add 10kg of urea, add reaction for 30 minutes at the material temperature of 80-85℃ .

[0053] (6) After the reaction time is up, add 3 kg of melami...

Embodiment 3

[0060] (1) Put 980kg of formaldehyde (37% formaldehyde content) into a 5000L enamel reactor, add 224kg of acetone, add catalyst A to adjust the pH value of the material, and the pH value is controlled within the range of 9.5 to 1.0.

[0061] (2) Addition reaction for 90 minutes at material temperature 80±2℃.

[0062] (3) After the reaction time is up, add 240g of urea, and add reaction for 60 minutes at the material temperature of 80-85°C.

[0063] (4) After the reaction time is up, add 1200g of furfuryl alcohol, add 24kg of catalyst B, control the PH value in the range of 4.0-4.5, at (5) material temperature 100±2℃, polycondensation reaction for 60 minutes.

[0064] (5) After the reaction time is up, reduce the material temperature to below 85°C, add 12kg of catalyst C, control the PH value in the range of 7.5-8.0, add 20kg of urea, and add reaction at 80-85°C for 30 minutes.

[0065] (6) After the reaction time is up, add 6 kg of melamine, and react for 30 minutes at a material temper...

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Abstract

The invention provides a preparation process of environment-friendly urea formaldehyde ketone-based modified furan foundry resin. According to the process, the product is prepared by condensing addition products of formaldehyde, urea and acetone and furfuryl alcohol. The process is mainly achieved through four mainly production sections including the addition reaction, the polycondensation reaction, the formaldehyde removal reaction and dehydration. The prepared product is used as a binding agent and used for manufacturing sand molds (cores) used for foundry, and manufactured sand molds (cores) are suitable for casting pouring of different metal materials and can meet casting product quality index requirements. The process can be applied to the technical field of preparation processes of furan foundry resin.

Description

Technical field [0001] The invention relates to a preparation process of an environment-friendly urea aldehyde ketone modified furan casting resin. Background technique [0002] At present, most of the foundry sand molds (cores) use urea-formaldehyde-modified furan resin as the binder. The furan resin is synthesized by polycondensation of the addition reactant of formaldehyde and urea under alkaline conditions with furfuryl alcohol, and dehydration And made. First of all, the addition reactants of formaldehyde and urea under alkaline conditions are monomethyloluria and dimethyloluria, and trimethyloluria is rarely formed. When the addition reaction reaches a certain level, the reaction system reaches the first dynamic equilibrium. At this time, there is still a large amount of free formaldehyde in the product that does not participate in the reaction, which will cause environmental pollution and harm to workers in future use. According to Lu Chadley's chemical equilibrium princ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G16/04C08G16/02B22C1/22
CPCB22C1/224C08G16/0262C08G16/04
Inventor 谢树忠李方义刘春晶梁家豪
Owner 广东省铸力铸材科技有限公司
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