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Method for preparing nano modified urea resin

A urea-formaldehyde resin and nano-modification technology, which is applied in the field of fine chemicals, can solve the problems of small modification effect, poor stability, and reduced bonding strength.

Inactive Publication Date: 2010-11-10
江门市双键实业有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Wood-based panels for interior decoration generally use low molar ratio UF resin, which will undoubtedly reduce the amount of formaldehyde released from wood-based panels, but at the same time, it will also cause some adverse effects on the performance of UF resin, such as poor stability and reduced bonding strength.
Adding fillers to UF resin has a certain effect on improving performance, but the fillers added in the past are all particles above the micron level, and the modification effect is very small

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0008] Add formaldehyde solution and the first batch of urea to the three-necked bottle, and after the urea is completely dissolved, use 30.0% to 40.0% NaOH solution to adjust the pH value to 7.6 to 8.0, slowly rise to a certain temperature within 40 to 60 minutes, and keep it warm for 45 minutes; %~40.0% formic acid to adjust the pH value to 4.2~4.6. After a certain period of time reaches the cloud point, use 30.0%~40.0% NaOH solution to adjust the pH value to 7.0~7.5, add the second batch of urea, and react at 88°C for about 45 minutes; The third batch of urea was kept at 65°C for 20 minutes; the pH value was adjusted to 7.5-8.0, and the urea-formaldehyde resin was obtained at 40°C, and the nano-TiO 2 The sol was blended with the synthesized UF resin adhesive, and the added amount was 5% of the solid content of the UF resin, and mechanically stirred for 30 minutes to fully disperse it.

Embodiment approach 2

[0010] Add formaldehyde solution and the first batch of urea to the three-necked bottle, and after the urea is completely dissolved, use 30.0% to 40.0% NaOH solution to adjust the pH value to 7.6 to 8.0, slowly rise to a certain temperature within 40 to 60 minutes, and keep it warm for 45 minutes; %~40.0% formic acid to adjust the pH value to 4.2~4.6. After a certain period of time reaches the cloud point, use 30.0%~40.0% NaOH solution to adjust the pH value to 7.0~7.5, add the second batch of urea, and react at 88°C for about 45 minutes; The third batch of urea was kept at 65°C for 20 minutes; the pH value was adjusted to 7.5-8.0, and the urea-formaldehyde resin was obtained at 40°C, and the nano-SiO 2 The sol was blended with the synthetic UF resin adhesive, and the added amount was 3% of the solid content of the UF resin, and mechanically stirred for 30 minutes to fully disperse it.

Embodiment approach 3

[0012] Add formaldehyde solution and the first batch of urea to the three-necked bottle, and after the urea is completely dissolved, use 30.0% to 40.0% NaOH solution to adjust the pH value to 7.6 to 8.0, slowly rise to a certain temperature within 40 to 60 minutes, and keep it warm for 45 minutes; %~40.0% formic acid to adjust the pH value to 4.2~4.6. After a certain period of time reaches the cloud point, use 30.0%~40.0% NaOH solution to adjust the pH value to 7.0~7.5, add the second batch of urea, and react at 88°C for about 45 minutes; For the third batch of urea, keep it at 65°C for 20 minutes; adjust the pH value to 7.5-8.0, lower it to 40°C and discharge to obtain urea-formaldehyde resin, blend nano-calcium carbonate with the synthesized UF resin adhesive, and the addition amount is UF resin solid content of 3%, mechanical stirring for 30min to fully disperse it.

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PUM

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Abstract

The invention relates to a method for preparing nano modified urea resin, and belongs to the field of fine chemical engineering. The method provided by the invention comprises mixing and modification of nano ions and urea resin, wherein the nano particles comprise one or two or mixture of over two of nano titanium dioxide, nano silicon dioxide and nano calcium carbonate. The nano particles have small particle diameter, large specific surface area and high surface energy; and the surfaces of the nano particles have a large amount of unsaturated residual bonds, so the nano particles have high reaction activity and strong bonding force with the UF resin, and can reduce the content of free formaldehyde, improve the cross-linking degree of the UF resin, play a toughening role in reducing the content of the free formaldehyde in the urea resin, improve the cross-linking degree of the UF resin and play a toughening role.

Description

1. Technical field [0001] The invention relates to a preparation method of nano-modified urea-formaldehyde resin, which belongs to the field of fine chemical industry. 2. Background technology [0002] Urea-formaldehyde (UF) resin adhesive is currently the largest synthetic resin adhesive in the wood industry, accounting for about 80% of wood adhesives. Since the wood-based panels produced by UF resin will slowly release formaldehyde, which seriously pollutes the indoor environment and is harmful to human health, reducing the amount of formaldehyde released from wood-based panels has become a research hotspot. At present, the main improvement measures are: adopting low molar ratio formula, improving synthesis process, adding various modifiers, etc. Wood-based panels for interior decoration generally use low molar ratio UF resin, which will undoubtedly reduce the formaldehyde emission of wood-based panels, but at the same time, it will also cause some adverse effects on the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L61/24C08K3/22C08K3/36C08K3/26
Inventor 黄惠贤张卓峰刘玉梅姜少华尹荔松
Owner 江门市双键实业有限公司