Furan resin for casting and preparation method thereof

A furan resin and lignin technology, which is used in casting and molding equipment, casting molds, manufacturing tools, etc., can solve the problems of firm combination of lignin and furan resin, strength reduction, etc., to improve strength, reduce dosage, and increase cross-linking points. Effect

Inactive 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

However, its physical blending cannot make the lignin and furan resin firmly bonded, so its strength will be significantly reduced.

Method used

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  • Furan resin for casting and preparation method thereof
  • Furan resin for casting and preparation method thereof
  • Furan resin for casting and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Add 774Kg of furfuryl alcohol into the reaction kettle, start stirring, adjust the pH to 8.5 with 15% sodium hydroxide solution, add 56Kg of lignin, raise the temperature to 70°C for 2 hours, cool down, adjust the pH to 6.5 with 20% oxalic acid solution, and Carry out dehydration, and stop dehydration until the water content of the resin is below 1.0%, to obtain 794Kg of lignin-modified furfuryl alcohol component for use.

[0023] Add 316Kg of formaldehyde (concentration 37%) into the reaction kettle, start stirring, add 72Kg of urea in one step, after the urea dissolves, adjust the pH value to 7.8 with alkaline solution, raise the temperature to 85°C and react for 1 hour; add lignin modified furfuryl alcohol component 294Kg and then react for 1 hour; adjust the pH value of the material system to 3.7, and react at a reaction temperature of 95°C for 1.5 hours; add 18Kg of two-step urea, adjust the pH value of the material system to 7.5, and react at 75°C for 1 hour, then ...

Embodiment 2

[0025] Add 837Kg of furfuryl alcohol into the reaction kettle, start stirring, adjust the pH to 9.0 with 15% sodium hydroxide solution, add 93Kg of lignin, raise the temperature to 70°C for 2 hours, cool down, adjust the pH to 7.5 with 20% oxalic acid solution, and put it under vacuum Dehydration is carried out until the water content of the resin is below 1.0%, and the dehydration is stopped to obtain 886Kg of lignin-modified furfuryl alcohol components for use.

[0026] Add 243Kg of formaldehyde (concentration 37%) to the reaction kettle, start stirring, add 60Kg of urea in one step, after the urea dissolves, adjust the pH value to 8.4 with alkaline solution, raise the temperature to 90°C and react for 2 hours; add lignin modified furfuryl alcohol component 286Kg to react for another 2 hours; adjust the pH value of the material system to 4.2, and react at a reaction temperature of 90°C for 2 hours; add 15Kg of two-step urea, adjust the pH value of the material system to 7, an...

Embodiment 3

[0028] Add 867Kg of furfuryl alcohol into the reaction kettle, start stirring, adjust the pH to 11.0 with 15% sodium hydroxide solution, add 153Kg of lignin, raise the temperature to 78~80°C for 2 hours, cool down, adjust the pH to 7.5 with 20% oxalic acid solution, vacuum Dehydration is carried out under the state, and the dehydration is stopped until the water content of the resin is below 1.0%, and 979Kg of the lignin-modified furfuryl alcohol component is obtained for use.

[0029] Add 223Kg of formaldehyde (concentration 37%) to the reaction kettle, start stirring, add 60Kg of urea in one step, after the urea dissolves, adjust the pH value to 8.8 with alkaline solution, raise the temperature to 85°C and react for 1.5 hours; add the lignin-modified furfuryl alcohol component 279Kg and then react for 1.5 hours; adjust the pH value of the material system to 4.6, and react at a reaction temperature of 95°C for 1 hour; add 15Kg of two-step urea, adjust the pH value of the mater...

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Abstract

The invention relates to a furan resin for casting and a preparation method thereof. The furan resin comprises, by weight, 15 to 35 parts of formaldehyde, 5 to 10 parts of urea, 60 to 90 parts of furfuryl alcohol and 5 to 40 parts of lignin. According to the furan resin for casting and the preparation method thereof, the lignin is used for modifying the furfuryl alcohol, the cost is lowered, simultaneously the content of free formaldehyde is lowered to a certain extent, and the initial strength and final strength are improved to a certain extent.

Description

technical field [0001] The invention relates to a furan resin for casting and a preparation method thereof, in particular to a furan resin for casting with furfuryl alcohol partially carried by lignin and a preparation method thereof. Background technique [0002] Furan resin refers to the general name of resins produced with furfuryl alcohol with furan ring as raw material. It has the characteristics of fast curing speed, high strength at room temperature, small gas generation, and high strength at high temperature. Therefore, it is widely used as a binder in the metal casting industry. It plays an important role in the machinery industry. In recent years, the price of furfuryl alcohol, the raw material for producing furan resin, has been high, causing the price of furan resin to rise. Therefore, it is necessary to find a suitable raw material to replace or partially replace furfuryl alcohol to reduce production costs. [0003] As a natural polymer widely existing in natur...

Claims

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Application Information

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