Weather-resistant urea formaldehyde resin preparation method

A urea-formaldehyde resin and weather resistance technology, applied in the field of weather-resistant urea-formaldehyde resin and its preparation, can solve the problems of lack of in-depth research on thermal stability, poor weather resistance and heat resistance, and poor dimensional stability, and improve application performance. and expansion, good weather resistance, simple and easy preparation method

Inactive Publication Date: 2018-02-23
任会平
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it has the following disadvantages: poor weather resistance, poor thermal stability, poor water resistance, and releases harmful gas of formaldehyde
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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  • Weather-resistant urea formaldehyde resin preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] A weather-resistant urea-formaldehyde resin prepared by the following method:

[0041] (1) Synthesis steps of acrylate solution:

[0042] Synthesis of acrylate solution: Add 150ml of deionized water, 1.0g, and emulsifier sodium lauryl sulfate in a 500ml round bottom three-neck flask with stirring, turn on the stirring, and then add 23g methyl methacrylate to the flask Control the temperature to 55-60℃, add 0.3g potassium persulfate, and add 77g butyl acrylate dropwise so that the reaction temperature does not exceed 80℃. After the reaction is completed, keep the temperature for 0.5-1.0 hours, cool to room temperature, and filter to obtain acrylic acid Ester solution.

[0043] (2) Preparation steps of urea-formaldehyde resin:

[0044] ①Synthesis of urea-formaldehyde resin prepolymer: add 22.0g of urea, 33.0mL of formaldehyde and 250.0mL of deionized water into a three-necked flask, use sodium carbonate to increase the pH of the solution to 8, and increase the temperature to 75℃...

Embodiment 2

[0050] A weather-resistant urea-formaldehyde resin prepared by the following method:

[0051] (1) Synthesis steps of acrylate solution:

[0052] Synthesis of acrylate solution: Add 150ml of deionized water, 1.0g, and the emulsifier sodium lauryl sulfate into a 500ml round bottom three-necked flask with stirring, turn on the stirring, then add 21g methyl methacrylate to the flask Control the temperature to 55-60℃, add 0.3g ammonium persulfate, and add 79g butyl acrylate dropwise so that the reaction temperature does not exceed 80℃. After the reaction is completed, keep the temperature for 0.5-1.0 hours, cool to room temperature, and filter to obtain acrylic acid Ester emulsion.

[0053] (2) Preparation steps of urea-formaldehyde resin:

[0054] ①Synthesis of urea-formaldehyde resin prepolymer: Put 40.0g of urea, 40.0mL of formaldehyde and 250.0mL of deionized water into a three-necked flask, increase the pH of the solution to 9 with sodium carbonate, and increase the temperature to 75...

Embodiment 3

[0058] A weather-resistant urea-formaldehyde resin prepared by the following method:

[0059] (1) Synthesis steps of acrylate solution:

[0060] Synthesis of acrylate solution: Add 150ml deionized water, 1.1g, and emulsifier sodium lauryl sulfate in a 500ml round bottom three-neck flask with stirring, then turn on the stirring, and then add 33g methyl methacrylate to the flask Control the temperature to 55-60℃, add 0.4g potassium persulfate, and add 67g butyl methacrylate dropwise so that the reaction temperature does not exceed 80℃. After the reaction is completed, keep it for 0.5-1.0 hours, cool to room temperature, and filter. , Acrylic emulsion is obtained.

[0061] (2) Preparation steps of urea-formaldehyde resin

[0062] ①Synthesis of urea-formaldehyde resin prepolymer: Put 50.0g of urea, 50.0mL of formaldehyde and 250.0mL of deionized water into a three-necked flask, increase the pH of the solution to 12 with sodium carbonate, and increase the temperature to 75℃, continuously ...

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Abstract

The invention relates to a weather-resistant urea formaldehyde resin preparation method. The method comprises the steps that a modifier is added into urea formaldehyde resin prepolymer, polymerizationis conducted, and urea formaldehyde resin good in weather resistance is obtained, wherein the modifier is acrylate emulsion polymer. The service life of the urea formaldehyde resin is greatly prolonged; the urea formaldehyde resin is shaped like regular spherical particles or irregular cylindrical particles or irregular ellipsoidal particles, and the thermal stability and weather resistance are good; the preparation method is ingenious in idea and easy to operate, and the usage environment of the urea formaldehyde resin is expanded.

Description

Technical field [0001] The invention relates to the technical field of resin modification, in particular to a weather-resistant urea-formaldehyde resin and a preparation method thereof. Background technique [0002] Urea-formaldehyde resin is made of urea and formaldehyde. It has low cost, light color and high hardness. It is mainly used to make molded plastics, daily necessities and electrical parts. It can also be used as sheet adhesives, paper and fabric slurry and stickers. Panels, architectural decorative panels, etc. Because of its light color and easy coloring, the products are often rich and magnificent. However, it has the following disadvantages: weather resistance, poor thermal stability, poor water resistance, and release of harmful formaldehyde 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 ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G12/12C08F2/26C08F220/18C08F220/14C08L61/24C08L33/08
CPCC08F2/26C08F220/18C08G12/12C08L61/24C08L2201/08C08F220/1804C08L33/08C08F220/14C08F220/1802
Inventor 任会平
Owner 任会平
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