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Lignin-modified urea resin or foamed plastic and preparation method thereof

A technology of urea-formaldehyde resin and foam plastic, which is applied in the field of foam plastic and its preparation, and lignin-modified urea-formaldehyde resin. It can solve the problems of high formaldehyde release, weak aging resistance and low stability, and achieve low formaldehyde release and water resistance. Improved performance and aging resistance, good flame retardant performance

Active Publication Date: 2013-09-18
INST OF CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the disadvantages of poor water resistance, low stability, weak aging resistance and high formaldehyde release of urea-formaldehyde foam, its application is limited

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] 1. Preparation of Lignin Phenolization Products

[0053] Take 50 parts of lignin, add it into a high-temperature and high-pressure reactor, then add 100 parts of phenol, stir, then add 3 parts of phosphoric acid, stir, close the reactor, and replace the air in the reactor with nitrogen. Raise the temperature to 250°C and react for 2h (reaction pressure is 2MPa). After the reaction is completed, pass condensed water to lower the temperature of the reactor, then open the exhaust valve to release the pressure, and open the reactor to obtain a lignin phenolization product.

[0054] 2. Preparation of lignin modified urea-formaldehyde resin

[0055] a) Mix 65 parts of formaldehyde solution with a concentration of 37% and 10 parts of lignin phenolization products, adjust the pH to 8 with sodium hydroxide, heat up to 65°C and keep it warm for 2 hours, then add 13 parts of the first batch of urea (urea 65% of the total mass);

[0056] b) Heat up to 98°C and keep it warm for 3...

Embodiment 2

[0066] 1. Preparation of Lignin Phenolization Products

[0067] Same as described in Example 1.

[0068] 2. Preparation of lignin modified urea-formaldehyde resin

[0069] a) Mix 70 parts of formaldehyde solution with a concentration of 37% and 20 parts of lignin phenolization products, adjust the pH value to 7 with sodium hydroxide, heat up to 60°C and keep it warm for 2 hours, then add 11 parts of the first batch of urea ( 55% of the total mass of urea),

[0070] b) Raise the temperature to 90°C and keep it warm for 30 minutes, then cool down to 70°C and add 7 parts of the second batch of urea (35% of the total mass of urea),

[0071] c), then raise the temperature to 90°C and keep it warm for 30 minutes, then add 15% formic acid dropwise to adjust the pH to 5, after the reaction reaches the end, quickly adjust the pH to 7 with sodium hydroxide, and then add 2 parts of the third batch of urea ( 10% of the total mass of urea);

[0072] The method for judging the end of th...

Embodiment 3

[0080] 1. Preparation of Lignin Phenolization Products

[0081] Same as described in Example 1.

[0082] 2. Preparation of lignin modified urea-formaldehyde resin

[0083] a) Mix 65 parts of formaldehyde solution with a concentration of 37% and 6.5 parts of lignin phenolization products, adjust the pH to 8 with ammonia water, heat up to 80°C for 1 hour and add 13 parts of the first batch of urea (total mass of urea 65%);

[0084] b) Raise the temperature to 100°C and keep it warm for 15 minutes, then cool down to 85°C and add 5 parts of the second batch of urea (25% of the total mass of urea),

[0085] c), then raise the temperature to 100°C and keep it warm for 15 minutes, then add dropwise 15% formic acid solution to adjust the pH to 7, after the reaction reaches the end, quickly adjust the pH to 8 with ammonia water, and then add 2 parts of the third batch of urea (urea 10% of the total mass);

[0086] The method for judging the end of the reaction is as follows: add th...

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Abstract

The invention discloses lignin-modified urea resin or foamed plastic and preparation methods thereof. The preparation method of the lignin-modified urea resin comprises the following steps of: performing a urea resin preparation process by taking a lignin phenol product, formaldehyde and urea as raw materials, so as to obtain the lignin-modified urea resin. The formaldehyde emission amount of the lignin-modified urea resin provided by the invention is low. The lignin-modified urea foamed plastic is good in flame-retardant performance and can be used for external wall insulation, building decoration and the like.

Description

technical field [0001] The invention belongs to the technical field of organic composite materials, and in particular relates to a lignin-modified urea-formaldehyde resin, a foamed plastic and a preparation method thereof. Background technique [0002] Urea-formaldehyde resin is produced by polycondensation of urea and formaldehyde under acid or alkaline conditions. It is low in cost, light in color, high in hardness, oil-resistant, mildew-resistant, and has good insulation and temperature resistance. It is an earlier developed thermosetting resin. one. Due to the disadvantages of poor water resistance, low stability, weak aging resistance and high formaldehyde release of urea-formaldehyde foam, its application is limited. [0003] With the enhancement of people's awareness of environmental protection and concerns about the lack of petroleum resources, people are paying more and more attention to using renewable biomass resources as raw materials to replace petroleum and ot...

Claims

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Application Information

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IPC IPC(8): C08G12/40C08J9/30C08L61/32C08H7/00
Inventor 赵彤王娟李昊刘哲
Owner INST OF CHEM CHINESE ACAD OF SCI
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