High-intensity urea-formaldehyde resin microcapsule and preparation method thereof

A technology of urea-formaldehyde resin and microcapsules, applied in the field of high-strength urea-formaldehyde resin microcapsules and their preparation, can solve the problems of difficult control, harsh reaction conditions, poor sealing, etc., and achieves improved storage stability, improved mechanical strength, and improved mechanical strength. Effect

Inactive Publication Date: 2011-08-31
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Solve the defects of poor sealing of urea-formaldehyde resin microcapsules, easy collapse and damage after drying,

Method used

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  • High-intensity urea-formaldehyde resin microcapsule and preparation method thereof
  • High-intensity urea-formaldehyde resin microcapsule and preparation method thereof
  • High-intensity urea-formaldehyde resin microcapsule and preparation method thereof

Examples

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Effect test

Embodiment 1

[0029] A high-strength urea-formaldehyde resin microcapsule, the wall material of the capsule is urea-formaldehyde resin doped with 2%, 3%, 5%, 7% of the wall material quality of inorganic nanoparticles, the inorganic nanoparticles are particle diameter Nano titanium dioxide or nano silicon dioxide of 10nm, 20nm, 30nm, 50nm.

Embodiment 2

[0031] A preparation method of high-strength urea-formaldehyde resin microcapsules, comprising the following steps:

[0032] 1) Mix urea and formaldehyde at a molar ratio of 1:1.75, adjust the pH value to 8.5, 8.7 or 9.0, stir at 70°C, 73°C or 75°C for 1 hour, cool to room temperature, add distilled water to dilute to obtain the mass concentration 35%, 45%, 60% clear and transparent urea-formaldehyde prepolymer solution,

[0033] 2) Take 10mL, 13mL, 15mL or 20mL of the above urea-formaldehyde prepolymer solution, adjust its pH to 4.0, 4.1 or 4.2, and react at 23°C, 25°C or 26°C for 1 hour to obtain a water-soluble urea-formaldehyde resin.

[0034] 3) Disperse 0.01, 0.03 or 0.05g of inorganic nanoparticles in the oil phase to prepare an inorganic particle dispersion with a mass percentage of 0.04%, 0.12% or 0.2%, and add 40mL of the water-soluble urea-formaldehyde resin containing The deionized water of the system modifier and the system modifier accounts for 7.3% of the total...

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Abstract

The invention relates to a high-intensity urea-formaldehyde resin microcapsule. Titanium dioxide or silicon dioxide inorganic nanoparticles with particle diameter of 10 to 50 nm are doped in the wall material of the microcapsule. A preparation method of the high-intensity urea-formaldehyde resin microcapsule comprises the following steps of: mixing urea and formaldehyde according to a molar ratio of the urea to the formaldehyde of 1:1.75; adjusting the pH value to 8.5 to 9.0; stirring at the constant temperature of between 70 and 75 DEG C for 1 hour; diluting by adding distilled water to obtain urea-formaldehyde prepolymer solution with mass concentration of 35 to 60 percent; taking 10 to 20 milliliters of the urea-formaldehyde prepolymer solution and adjusting the pH value to 4.0 to 4.2; reacting at the temperature of between 23 and 26 DEG C for 1 hour to obtain water-soluble urea-formaldehyde resin; dispersing the inorganic nanoparticles into an oil phase to prepare 0.04 to 0.2 mass percent of inorganic particle dispersion liquid; adding 40 milliliters of 7.3 mass percent of deionized water solution of a system modifier into the water-soluble urea-formaldehyde resin; adding 4.5 milliliters of inorganic particle dispersion liquid dropwise under stirring to form emulsion and then adjusting the pH value to 3.0 to 3.5; reacting at the temperature of between 23 and 26 DEG C for 1 hour; adding 0.3 to 3 grams of curing agent; heating the product to 45 to 50 DEG C; performing heat-preserving reaction for 2 hours; and performing suction-filtration and drying to obtain the urea-formaldehyde resin microcapsule, of which the wall material is doped with the inorganic nanoparticles.

Description

1. Technical field [0001] The invention belongs to the technical field of fine chemicals and microcapsules, in particular to a high-strength urea-formaldehyde resin microcapsule and a preparation method thereof. 2. Background technology [0002] A "core-shell" structure formed by wrapping dispersed solid, liquid, gas or their mixture (core material or capsule core) in natural or synthetic polymer materials or inorganic materials (wall material or capsule wall) Tiny containers, called microcapsules. Microcapsule technology began in the 1930s, but it was widely used in production after NCR Corporation of the United States prepared oil-containing gelatin microcapsules in 1953 and used them for carbonless copy paper. Because microcapsule products have obvious characteristics in the isolation and protection of active components, sustained release, and targeted drugs, they have attracted people's attention since their inception. As a commercial means with excellent performance...

Claims

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Application Information

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IPC IPC(8): C08L61/24C08K3/22C08K3/36C08G12/12B01J13/18
Inventor 孙岳明牛晓伟丁收年
Owner SOUTHEAST UNIV
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