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Preparation method of urea-formaldehyde resin with high thermal stability

A high thermal stability, urea-formaldehyde resin technology, applied in the field of resin modification, can solve the problems of lack of in-depth research on thermal stability, poor weather resistance and heat resistance, poor dimensional stability, etc., and achieves a simple and easy preparation method. Good thermal stability and improved thermal stability

Inactive Publication Date: 2018-05-18
广东晨晖新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But it has the following disadvantages: poor thermal stability, poor water resistance, release formaldehyde harmful gas
However, no in-depth research has been done on improving thermal stability
[0010] In addition, the existing urea-formaldehyde resin has poor weather resistance and heat resistance, and still has the disadvantages of brittleness, water absorption, and poor dimensional stability, and cracks often occur even when left standing.

Method used

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  • Preparation method of urea-formaldehyde resin with high thermal stability
  • Preparation method of urea-formaldehyde resin with high thermal stability
  • Preparation method of urea-formaldehyde resin with high thermal stability

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] A kind of higher thermal stability urea-formaldehyde resin is prepared by the following method:

[0040] (1) Rare earth stabilizer modification steps:

[0041] ①Short-chain modifier modification: 10.0g of dry complex rare earth was activated at 100°C for 2h, dispersed into 50.0mL of methanol, and ball-milled for 2h; then the mixture of rare earth stabilizer and methanol was transferred to a 10.0mL In a 250mL three-neck flask of ammonia water, raise the temperature to 60°C, heat for 1h, then add 5.0mL of TEOS (tetraethylsilicate), and continue stirring for 6h; filter the obtained slurry, wash with methanol 3 times, Finally obtain the rare earth stabilizer filter cake modified by the short-chain modifier;

[0042] ②Preparation of long-chain coupling agent hydrolyzate: Add 20.0mL of γ-aminopropyltriethoxysilane to a mixture of 5.0mL of deionized water and 100.0mL of methanol for 1h, adjust the pH to 4 with anhydrous acetic acid, Stir for 1h to obtain the hydrolyzate of γ...

Embodiment 2

[0052] A kind of higher thermal stability urea-formaldehyde resin is prepared by the following method:

[0053] (1) Rare earth stabilizer modification steps:

[0054] ①Short-chain modifier modification: 12.0g of dry complex rare earth alkyl was activated at 100°C for 2h, dispersed into 300.0mL of methanol, and ball milled for 2h; after that, the mixture of rare earth stabilizer and methanol was transferred to a In a 500mL three-neck flask containing 60.0mL ammonia water, raise the temperature to 60°C, heat for 1h, then add 30.0mL of TEOS, and continue stirring for 6h; filter the resulting slurry and wash with methanol for 3 times, finally obtain the rare earth stabilizer filter cake modified by the short-chain modifier;

[0055] ②Preparation of long-chain coupling agent hydrolyzate: add 12.0mL of γ-aminopropyltriethoxysilane to a mixture of 3.0mL deionized water and 60.0mL of methanol for 1 hour, adjust the pH to 4 with anhydrous acetic acid, Stir for 1h to obtain the hydrol...

Embodiment 3

[0062] A kind of higher thermal stability urea-formaldehyde resin is prepared by the following method:

[0063] (1) Rare earth stabilizer modification steps:

[0064] ①Short-chain modifier modification: Activate 16.0g of dry composite rare earth stabilizer at 100°C for 4h, disperse it into 400.0mL of methanol, and ball mill for 2h; then transfer the mixture of rare earth stabilizer and methanol to a In a 1000mL three-necked flask with 80.0mL ammonia water, raise the temperature to 60°C, heat for 1h, then add 5.0mL of TEOS (tetraethyl orthosilicate) and continue stirring for 6h; filter the resulting slurry and wash with methanol for 3 times , finally obtain the filter cake of the rare earth stabilizer modified by the short-chain modifier;

[0065] ②Preparation of long-chain coupling agent hydrolyzate: Add 16.0mL of γ-aminopropyltriethoxysilane to a mixture of 4.0mL deionized water and 80.0mL of methanol for 1 hour, adjust the pH to 4 with anhydrous acetic acid, Stir for 1h to...

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Abstract

The invention relates to a urea-formaldehyde resin with high thermal stability, and a preparation method thereof. The preparation method comprises: adding an appropriate thermal stabilizer to a urea-formaldehyde resin prepolymer, and polymerizing to obtain the urea-formaldehyde resin with high thermal stability, wherein the thermal stabilizer is a composite rare earth stabilizer. According to thepresent invention, the modified urea-formaldehyde resin has the substantially-improved heat resistance, the morphology of the urea-formaldehyde resin is regular spherical particles, irregular cylindrical particles or irregular ellipsoidal particles, and the thermal stability is good; and the preparation method has advantages of clever design and simple operation, and provides the platform for themodification of urea-formaldehyde resin.

Description

technical field [0001] The invention relates to the technical field of resin modification, in particular to a preparation method of urea-formaldehyde resin with relatively high thermal stability. 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 rati...

Claims

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Application Information

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IPC IPC(8): C08L61/24C08K9/00C08K9/02C08K9/04C08K9/06C08K3/22C08G12/12
CPCC08G12/12C08K3/22C08K9/00C08K9/02C08K9/04C08K9/06C08L2201/08C08K2003/221C08L61/24
Inventor 任会平
Owner 广东晨晖新材料科技有限公司
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