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Furan resin synthesized with modifying lignin and preparing method of furan resin

A furan resin and lignin technology, which is applied in casting molding equipment, manufacturing tools, metal processing equipment, etc., can solve the problems of complex products, unfavorable industrial production, harsh reaction conditions, etc., and achieve simple modification methods and high modification effects Good, stable performance

Active Publication Date: 2016-09-07
SUZHOU XINGYE MATERIALS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are many modification methods, such as phenolization, hydroxymethylation, oxidation, etc., but most of the reaction conditions are harsh and the products are complicated, which is not conducive to industrial production

Method used

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  • Furan resin synthesized with modifying lignin and preparing method of furan resin

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Reaction steps: Weigh 30 kg of the above-mentioned high-purity lignin, 15 kg of maleic anhydride and 3 kg of xylitol respectively, place them in a high-mix mixer, and stir at 100°C for 15 minutes to fully mix and react to obtain modified lignin.

[0034] Add 47.8kg of formaldehyde (concentration 37%) and 16kg of urea to the reaction kettle, start stirring, after the urea dissolves, adjust the pH range of the solution with sodium hydroxide between 8.3-8.7, heat up to 85±2°C and react for 1 hour; Dehydrate 28kg under vacuum conditions, add 105kg of furfuryl alcohol in one step and 48kg of modified lignin and react for 1 hour at 85±2°C; add 69kg of furfuryl alcohol in two steps, adjust the material system pH4. Keep warm at 105°C for 2 hours; add 3.5kg of two-step urea, adjust the pH value of the solution between 8.0-8.5 with sodium hydroxide, stop the reaction after reacting at 80±2°C for 0.5 hours, and adjust the pH value of the system to 6.5-7.5; add 90kg of three-step fu...

Embodiment 2

[0036] Reaction steps: Weigh 25kg of the above-mentioned high-purity lignin, 13kg of maleic anhydride and 2kg of xylitol respectively, place them in a high-mix mixer, and stir at 90°C for 10 minutes to fully mix and react to prepare modified lignin.

[0037] Add 42kg of formaldehyde (concentration 37%) and 13kg of urea to the reaction kettle, start stirring, after the urea dissolves, adjust the pH range of the solution with potassium hydroxide between 8.5-9.0, heat up to 90±2°C and react for 1 hour; Dehydrate 25kg under the same conditions, add 90kg of furfuryl alcohol in one step and 40kg of modified lignin at 90±2℃-react for 1.5 hours; add 55kg of furfuryl alcohol in second step, adjust the pH of the material system to 4.0-4.2 with 10% hydrochloric acid, and the reaction temperature is 100±2 Keep warm at ℃ for 3 hours; add 3kg of two-step urea, potassium hydroxide to adjust the pH value of the solution between 8.1-8.4, stop the reaction after reacting at 85±2°C for 0.5 hours,...

Embodiment 3

[0039] Reaction steps: Weigh 68 kg of the above-mentioned high-purity lignin, 24 kg of maleic anhydride and 8 kg of xylitol, place them in a high-mix mixer, and stir at 105° C. for 20 minutes to fully mix and react to prepare modified lignin.

[0040] Add 70kg of formaldehyde (concentration 37%) and 22kg of urea into the reaction kettle, start stirring, after the urea is dissolved, adjust the pH range of the solution to 8.0-8.5 with hexamethylenetetramine, raise the temperature to 80-85°C and react for 1 hour ;Dehydrate 42kg under vacuum conditions, add 135kg of furfuryl alcohol in one step and 100kg of modified lignin and react for 1 hour at 80-85°C; add 35kg of furfuryl alcohol in two steps, adjust the material system pH3. Incubate at ±2°C for 1.5 hours; add 5kg of two-step urea, adjust the pH value of the solution between 8.1-8.4 with sodium hydroxide, stop the reaction after reacting at 85±2°C for 0.5 hours, adjust the pH value of the system to 6.5-7.5; add 175kg of three-s...

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Abstract

The invention relates to a furan resin synthesized with modifying lignin. The furan resin is mainly prepared from, by weight, 8-15 parts of lignin, 3-5 parts of maleic anhydride, 1-3 parts of xylitol, 3-8 parts of urea, 80-120 parts of furfuryl alcohol and 8-20 parts of formaldehyde. In the process of synthesizing the furan resin, the modifying lignin serves as an intermediate and is added into a reaction system, the modifying method is simple, and the effect is good. The furan resin modified by the lignin is stable in product performance, low in free formaldehyde content and capable of meeting the performance requirements of most casting resin sand.

Description

technical field [0001] The invention belongs to the technical field of organic chemistry, and in particular relates to a method for preparing modified lignin for synthesizing casting furan resin, in particular to a method for preparing furan resin by modifying lignin with maleic anhydride and xylitol. Background technique [0002] As the most widely used resin binder in the metal casting industry, furan resin has a series of advantages such as high strength, low gas generation, and fast curing speed. However, the price of furfuryl alcohol resin as its raw material has always remained high. Therefore, both at home and abroad have been trying to find a raw material that can partially replace furfuryl alcohol to reduce production costs. With the enhancement of people's awareness of environmental protection and rational use of resources, some new environmentally friendly materials, such as lignin, xylitol, sorbitol, ethylene glycol, etc., are being used to replace furfuryl alcoh...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G16/04B22C1/22
CPCB22C1/224C08G16/04
Inventor 戴旭朱文英王全想王文浩王锦程
Owner SUZHOU XINGYE MATERIALS TECH
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