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A kind of carbon nanotube modified urea-formaldehyde resin and preparation method thereof

A technology of carbon nanotube modification and urea-formaldehyde resin, which is applied in the field of carbon nanotube-modified urea-formaldehyde resin and its preparation, can solve the problems of low compatibility, limited amount of formaldehyde binding, difficulty in guaranteeing the binding rate of nanoparticles, etc., and achieve The preparation process is simple and the adhesive force is strong

Active Publication Date: 2016-07-06
SUZHOU POLYMER NEW MATERIALS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this technical scheme, carbon nanotubes and nano-titanium dioxide have low compatibility with the reaction system, it is difficult to ensure the binding rate of nanoparticles, and the binding amount with formaldehyde is limited

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] (1) Add 100 parts of formaldehyde solution to the polymerization reactor, adjust the pH value to 1.5-2.5, add 2 parts of polyvinyl alcohol, add 10 parts of urea under stirring conditions, raise the temperature to 50±1°C, and react for 1 hour;

[0031] (2), adjust the pH of the reaction solution in step (1) to be 7.5 to 8.5, add 10 parts of urea, finish adding in 30 to 40 minutes, heat up to 90±1°C, and react for 2 hours;

[0032] (3), add 20 parts of urea to the reaction solution of step (2), finish adding within 30 to 40 minutes, then add 8 parts of carbon nanotubes, 3 parts of montmorillonite, 5 parts of oxidized starch and 3 parts of magnesium salt , lower the temperature to 80° C., react for 2 hours, and lower to room temperature to obtain carbon nanotube modified urea-formaldehyde resin.

Embodiment 2

[0034] (1) Add 105 parts of formaldehyde solution to the polymerization reactor, adjust the pH value to 1.5-2.5, add 3 parts of polyvinyl alcohol, add 11 parts of urea under stirring conditions, heat up to 50±1°C, and react for 1 hour;

[0035] (2), adjust the pH of the reaction solution in step (1) to be 7.5 to 8.5, add 11 parts of urea, finish adding in 30 to 40 minutes, heat up to 90±1°C, and react for 2 hours;

[0036] (3), add 22 parts of urea in the reaction liquid of step (2), add in 30~40 minutes, then add 10 parts of carbon nanotubes, 4 parts of montmorillonite, 6 parts of acrylate emulsions and 3 parts of borax , lower the temperature to 80° C., react for 2 hours, and lower to room temperature to obtain carbon nanotube modified urea-formaldehyde resin.

Embodiment 3

[0038] (1) Add 110 parts of formaldehyde solution to the polymerization reactor, adjust the pH value to 1.5-2.5, add 3 parts of polyvinyl alcohol, add 11 parts of urea under stirring conditions, raise the temperature to 50±1°C, and react for 1 hour;

[0039] (2), adjust the pH of the reaction solution in step (1) to be 7.5 to 8.5, add 11 parts of urea, finish adding in 30 to 40 minutes, heat up to 90±1°C, and react for 2 hours;

[0040] (3), add 22 parts of urea in the reaction liquid of step (2), add in 30~40 minutes, then add 10 parts of carbon nanotubes, 5 parts of montmorillonite, 7 parts of styrene-butadiene latex and 4 parts of borax , lower the temperature to 80° C., react for 2 hours, and lower to room temperature to obtain carbon nanotube modified urea-formaldehyde resin.

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PUM

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Abstract

The invention provides carbon nano-tube modified urea formaldehyde resin and a preparation method thereof. The modified urea formaldehyde resin consists of the following components: urea, a formaldehyde solution, polyvinyl alcohol, carbon nano-tubes, smectite, a water-based enhancer and a stabilizing agent. The preparation method comprises the following steps: adding the formaldehyde solution into a polymerization reaction kettle, regulating the pH value, adding polyvinyl alcohol, adding 1 / 4 of urea under the condition of stirring, heating to 50+ / -1 DEG C, and reacting for 1 hour; regulating the pH value of a reaction liquid, completely adding 1 / 4 of urea within 30-40 minutes, heating to 90+ / -1 DEG C, and reacting for 2 hours; and completely adding residual 1 / 2 of urea into the reaction liquid within 30-40 minutes, adding the carbon nano-tubes, smectite, the water-based enhancer and the stabilizing agent, cooling to 80 DEG C, reacting for 2 hours, and cooling to room temperature to obtain the carbon nano-tube modified urea formaldehyde resin. The preparation method provided by the invention can be used for effectively adsorbing a great number of free formaldehyde in the urea formaldehyde resin, and is simple in preparation process; and the modified urea formaldehyde resin prepared by using the method provided by the invention is strong in adhesive force, and is suitable for industrial application.

Description

technical field [0001] The invention relates to a polymer material and a preparation method thereof, in particular to a carbon nanotube modified urea-formaldehyde resin and a preparation method thereof. Background technique [0002] Urea-formaldehyde resin is a polymer obtained by the reaction of urea and formaldehyde. It has the advantages of low cost, simple synthesis process, and good wear resistance. It is one of the main types of glue in the wood industry. However, it contains a large amount of free formaldehyde, so that the glued products still release formaldehyde during use, pollute the environment, and endanger people's health. Therefore, eliminating the free formaldehyde content in urea-formaldehyde resin has become the focus of many scientists' research. If the amount of formaldehyde is reduced when preparing urea-formaldehyde resin, although the content of free formaldehyde can be reduced, the bonding performance of the resin will be deteriorated. Therefore, it ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L61/24C08K13/06C08K9/02C08K7/24C08K3/34C08G12/12
Inventor 翟红波杨振枢韦洪屹
Owner SUZHOU POLYMER NEW MATERIALS TECH
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