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Modified urea formaldehyde resin and preparation method thereof

A urea-formaldehyde resin and a modification technology, applied in the field of modified urea-formaldehyde resin and its preparation, can solve the problems of poor weather resistance and heat resistance, poor dimensional stability, poor thermal stability, etc., and achieve a good degree of modification and thermal stability. Improved, good thermal stability

Active Publication Date: 2016-11-23
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, it has the following disadvantages: poor thermal stability, poor water resistance, and releases harmful gas of formaldehyde
However, the modified attapulgite modifier aromatic hydrocarbons, etc., are highly toxic. During the synthesis process, a large amount of organic solvents are used, which greatly increases the cost of synthesis.
[0012] In addition, the existing urea-formaldehyde resin has poor weather resistance and heat resistance, and still has the disadvantages of being brittle, water-absorbent, and poor in dimensional stability. Even standing still, cracks often occur

Method used

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  • Modified urea formaldehyde resin and preparation method thereof
  • Modified urea formaldehyde resin and preparation method thereof
  • Modified urea formaldehyde resin and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0062] A modified urea-formaldehyde resin, prepared by the following method:

[0063] (1) Kaolin modification steps:

[0064] ①Short-chain modifier modification: 2.0g of dry kaolin was activated at 500°C for 4h, dispersed into 50.0mL of ethanol, and ball-milled for 2h; then the mixture of kaolin and ethanol was transferred to 250mL of 10.0mL of ammonia In a three-necked flask, raise the temperature to 60°C, heat for 1h, then add 5.0mL of TEOS, and continue to stir for 6h; filter the obtained slurry, wash with ethanol for 3 times, and finally obtain short-chain modifier-modified kaolin filter cake;

[0065] ②Preparation of long-chain coupling agent hydrolyzate: add 2.0mL of γ-aminopropyltriethoxysilane to a mixture of 0.5mL of water and 10.0mL of ethanol for 1h, adjust the pH to 4 with anhydrous acetic acid, and stir for 1h , to obtain the hydrolyzate of γ-aminopropyltriethoxysilane;

[0066] ③Long-chain coupling agent modification: redisperse the kaolin filter cake modified...

Embodiment 2

[0073] A modified urea-formaldehyde resin, prepared by the following method:

[0074] (1) Kaolin modification steps:

[0075] ①Short-chain modifier modification: 6.0g of dry kaolin was activated at 800°C for 5h, dispersed into 50.0mL of ethanol, and ball-milled for 4h; then the mixture of kaolin and ethanol was transferred to 250mL of 16.0mL of ammonia In a three-neck flask, raise the temperature to 60°C, heat for 1h, then add 16.0mL of TEOS, and continue to stir for 6h; filter the obtained slurry, wash with ethanol for 3 times, and finally obtain short-chain modifier-modified kaolin filter cake;

[0076] ②Preparation of long-chain coupling agent hydrolyzate: Add 6.0mL of γ-aminopropyltriethoxysilane to a mixture of 1.5mL of water and 12.0mL of ethanol for 1h, adjust the pH to 4 with anhydrous acetic acid, and stir for 1h , to obtain the hydrolyzate of γ-aminopropyltriethoxysilane;

[0077] ③Long-chain coupling agent modification: redisperse the kaolin filter cake modified ...

Embodiment 3

[0083] A modified urea-formaldehyde resin, prepared by the following method:

[0084] (1) Kaolin modification steps:

[0085] ①Short-chain modifier modification: 10.0g of dry kaolin was activated at 1000°C for 8h, dispersed into 150.0mL of ethanol, and ball-milled for 8h; the mixture was transferred to a 250mL three-necked flask filled with 20.0mL of ammonia water, Raise the temperature to 60°C, heat for 1 h, then add 20.0 mL of TEOS, and continue to stir for 6 h; filter the obtained slurry, wash with ethanol for 3 times, and finally obtain a kaolin filter cake modified by a short-chain modifier;

[0086] ②Preparation of long-chain coupling agent hydrolyzate: Add 8.0mL of γ-aminopropyltriethoxysilane to a mixture of 2.0mL of water and 15.0mL of ethanol for 1h, adjust the pH to 4 with anhydrous acetic acid, and stir for 1h , to obtain the hydrolyzate of γ-aminopropyltriethoxysilane;

[0087] ③Long-chain coupling agent modification: redisperse the kaolin filter cake modified b...

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Abstract

The present invention relates to a modified urea formaldehyde resin preparation method, which comprises: adding a modified layered silicate to a urea formaldehyde resin prepolymer, and polymerizing to obtain the layered silicate-modified urea formaldehyde resin, wherein the modified layered silicate is the layered silicate with the amino functional group on the surface. According to the present invention, the provided urea formaldehyde resin can contain up to 40% of the layered silicate so as to substantially reduce the cost of the urea formaldehyde resin; the morphology is the regular spherical particles, the irregular columnar particles or the irregular ellipsoidal particles, and the thermal stability is good; and the ideal of the preparation method is ingenious, the operation is simple, and the platform is provided for the modification of the urea formaldehyde resin.

Description

technical field [0001] The invention relates to the technical field of resin modification, in particular to a modified urea-formaldehyde resin and a preparation method thereof. Background technique [0002] Urea-formaldehyde resin is prepared from urea and formaldehyde. It is low in cost, light in color and high in hardness. It is mainly used in the manufacture of molded plastics, daily necessities and electrical parts. Panels, architectural decorative panels, etc. Because of its light color and easy coloring, the products are often rich and magnificent in color. However, it has the following disadvantages: poor thermal stability, poor water resistance, and release of formaldehyde harmful gas. [0003] In recent years, in order to overcome the above shortcomings, scientists from various countries have done a lot of research, usually the following methods: [0004] Method 1: Adjust the ratio of synthetic monomer formaldehyde and urea to optimize the ratio. [0005] Docume...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L61/24C08K9/06C08K9/04C08K3/34
Inventor 卢旭晨陈世伟王体壮
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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