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Preparation of macromolecular compatible additive, namely urea-formaldehyde modified lignin and application of macromolecular compatible additive

A technology of lignin and additives is applied in the field of preparation and application of urea-formaldehyde modified lignin polymer compatible additives, and achieves the effects of high purity, high chemical activity and low manufacturing cost

Active Publication Date: 2010-05-19
FUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Composite materials are developing rapidly, but the compatibility of materials directly affects the composite effect of raw materials with different polarities. When simple lignin is composited with other polymer materials, some properties of composite materials are not good.

Method used

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  • Preparation of macromolecular compatible additive, namely urea-formaldehyde modified lignin and application of macromolecular compatible additive
  • Preparation of macromolecular compatible additive, namely urea-formaldehyde modified lignin and application of macromolecular compatible additive
  • Preparation of macromolecular compatible additive, namely urea-formaldehyde modified lignin and application of macromolecular compatible additive

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preparation example Construction

[0033] The concrete steps of preparation method are:

[0034] 1) Add water with sodium hydroxide or potassium hydroxide to prepare a 2% by weight alkaline solution;

[0035] 2) Weigh and add the required amount of lignin or its derivatives and water according to the ratio, and adjust the solution to pH=10.0-12.0 with 2% alkaline solution;

[0036] 3) Weigh and add the required aldehyde according to the ratio, heat up to 75-95°C, and react for 0.5-2.0h;

[0037] 4) Add urea according to the required amount in the raw material ratio to the reactant in step 3), and continue the reaction for 1.0-1.5h;

[0038] 5) adding acid to adjust the pH value of the reactant in step 4) to 4.5-6.0, and polycondensation reaction at a temperature of 75-95°C for 15-80min;

[0039] 6) Discharging: Step 5) After the polycondensation reaction is completed, add acid to the reactant to adjust the pH=2.0-3.0, make it settle, suction filter, and dry to obtain urea-formaldehyde modified lignin, which i...

Embodiment 1

[0053] Weigh 15g of dried enzymatic lignin, put it into a 500ml three-necked bottle containing 225mL of 2% NaOH solution by weight, and stir for 15min to completely dissolve the enzymatic lignin in the NaOH solution; add 33mL, weight percent Formaldehyde solution with a concentration of 37% was heated in a water bath to 80°C, and after reflux and stirring for 1 hour, 24.3 g of urea was added and the reaction was continued for 1 hour; after the reaction was completed, a hydrochloric acid solution with a concentration of 12% by weight was slowly added to adjust the pH value to about 3. Let the precipitation stand, pour out the supernatant, centrifuge, wash the precipitate with deionized water three times, and then put the obtained product in a drying oven at 80°C to dry to a constant weight to obtain 40.5g of urea-formaldehyde modified enzymatic hydrolysis Lignin.

Embodiment 2

[0055] Preparation of lignin derivatives: Measure 21ml of epichlorohydrin, add it to a clean 250ml three-neck flask (in the container), weigh 5 grams of enzymatic lignin, pour it into the flask container, heat up to 50°C, stir for 30min, let Fully dissolve and mix lignin and epichlorohydrin, add 0.8ml of 30% NaOH solution by weight within 20 minutes, heat up to 5560°C, stir and reflux for 1 hour, heat up to 70°C, and add 2ml within 20 minutes NaOH solution with a concentration of 30% by weight, stirred and refluxed for 1 hour, and the excess epichlorohydrin was evaporated under reduced pressure to obtain 10ml of epichlorohydrin and a brown solid that is insoluble in water and has certain elasticity, washed with water and dried to obtain 10.85 grams of brittle brown solid enzymatic lignin epoxy resin.

[0056] Put 10.85 grams of brittle brown solid enzymatic lignin epoxy resin into a 500ml three-necked bottle filled with 210mL of 2% NaOH solution by weight, and stir for 25min t...

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Abstract

The invention provides preparation of a macromolecular compatible additive, namely urea-formaldehyde modified lignin and application of the macromolecular compatible additive, belonging to the field of macromolecular materials and modification thereof. The invention overcomes the defects caused because the polar groups in the molecular structure of the original lignin are insufficient, have difficulty in being compatible with the polar polymers and affect the performance of the lignin-polar polymer composite. In the invention, the lignin or the derivatives of the lignin are used as the main raw materials to carry out polycondensation reaction with formaldehyde and urea to obtain the urea-formaldehyde modified lignin. The modified lignin can be used as the macromolecular compatible additive to modify the macromolecular materials. The urea and the formaldehyde used in the invention are chemical raw materials at low cost. Using the urea-formaldehyde modified lignin to modify the macromolecular materials not only expands the application range of the lignin, a regenerative resource, but also further lowers the cost of the macromolecular composite. In addition, the processing technic is simple, implementation is easy and the modification effect is good.

Description

technical field [0001] The invention belongs to the field of polymer materials and their modification, and more specifically relates to the preparation and application of a urea-formaldehyde modified lignin polymer compatibility additive. Background technique [0002] With the development of polymer science, polymer materials have become indispensable and important materials for people's clothing, food, housing and transportation. But most polymers are derived from petrochemical products. Mineral and fossil raw material resources such as petroleum and coal are decreasing day by day, and the development and application of renewable resources have become the target of people's attention. Composite materials are developing rapidly, but the compatibility of materials directly affects the composite effect of raw materials with different polarities. When simple lignin is composited with other polymer materials, some properties of composite materials are not good. In order to ma...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08H6/00C08L97/00C08L27/06C08L55/02C08L67/04C08H7/00
Inventor 程贤甦
Owner FUZHOU UNIV
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