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Method for synthesizing urea-formaldehyde resin microspheres with uniform particle size distribution

A technology of urea-formaldehyde resin and particle size distribution, which is applied in the field of synthesizing urea-formaldehyde resin microspheres with uniform particle size distribution, and can solve the problems of not obtaining urea-formaldehyde resin microspheres

Inactive Publication Date: 2013-03-27
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This patent does not obtain urea-formaldehyde resin microspheres

Method used

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  • Method for synthesizing urea-formaldehyde resin microspheres with uniform particle size distribution
  • Method for synthesizing urea-formaldehyde resin microspheres with uniform particle size distribution
  • Method for synthesizing urea-formaldehyde resin microspheres with uniform particle size distribution

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] figure 1 It is the SEM photo of urea-formaldehyde resin microspheres without surfactant and its particle size distribution. It can be seen intuitively that the particle size distribution of the microspheres is not uniform and there are some adhesions. Therefore, adopting a brand-new method, that is, adding a surfactant, hopes to prepare urea-formaldehyde resin microspheres with uniform particle size distribution and dispersion.

[0028] Add 1mL of 1.00% Tween80 into a 100mL beaker containing 40mL of distilled water, add 2.25g of urea to dissolve, then add 6mL of formaldehyde and stir evenly, and finally add 0.2mL of hydrochloric acid. Stand until the solution reacts to form a cloudy white state, continue to react for ten minutes and separate by suction filtration, wash with a small amount of deionized water and ethanol three times respectively to obtain a urea-formaldehyde resin precipitate. The separated urea-formaldehyde resin microspheres were dried at room temperat...

Embodiment 2

[0030] Add 1mL of 2.00% CTAB into a 100mL beaker containing 40mL of distilled water, add 2.25g of urea to dissolve, then add 6mL of formaldehyde and stir evenly, and finally add 0.2mL of hydrochloric acid. Stand until the solution reacts to form a cloudy white state, continue to react for ten minutes and separate by suction filtration, wash with a small amount of deionized water and ethanol three times respectively to obtain a urea-formaldehyde resin precipitate. The separated urea-formaldehyde resin microspheres were dried at room temperature for 5 hours, and then dried in an oven at 70° C. for 24 hours to obtain urea-formaldehyde resin microspheres such as image 3 shown.

Embodiment 3

[0032] Add 2.25g of urea to 100mL of 40mL of distilled water to dissolve, add 6mL of formaldehyde and stir evenly, then add 0.2mL of hydrochloric acid. Let stand until the solution appears cloudy white, then quickly add 1mL of 1.00% Tween80, shake well, continue to react for 10 minutes and separate by suction filtration, wash with a small amount of deionized water and ethanol three times respectively to obtain a precipitate of urea-formaldehyde resin. The separated urea-formaldehyde resin microspheres were dried at room temperature for 5 hours, and then dried in an oven at 70° C. for 24 hours to obtain urea-formaldehyde resin microspheres such as Figure 4 shown.

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Abstract

The invention relates to a method for synthesizing urea-formaldehyde resin microspheres with uniform particle size distribution. According to the invention, a surfactant, urea, and formaldehyde are added into distilled water; urea-formaldehyde resin deposition is prepared; and pump-filtration and washing are carried out, such that urea-formaldehyde resin microspheres are obtained. Compared with prior arts, according to the invention, urea-formaldehyde resin microspheres are modified by using the surfactant, such that urea-formaldehyde resin microspheres with uniform particle size are prepared. The microspheres can be used in respects such as chromatographic filling materials, catalyst carriers, adhesives, super capacitor materials, and environmental pollution treatments.

Description

technical field [0001] The invention relates to a method for synthesizing polymer microspheres, in particular to a method for synthesizing urea-formaldehyde resin microspheres with uniform particle size distribution. Background technique [0002] Cross-linked polymer microspheres have a wide range of applications. For example, it is involved in the controlled release of drugs, environmental pollution water treatment, supercapacitor materials and chromatographic packing, etc. The polymer materials used to prepare microspheres include polystyrene, polyhydroxyethyl methacrylate, hydrophilic vinyl polymer, polyacrylamide and phenolic resin, etc., but urea-formaldehyde resin is rarely reported. The method for preparing cross-linked polymer uniform microspheres mainly includes a two-step swelling method (EP0003905, 1979). The method includes preparing polymer microspheres of about 1 micron and extremely uniform size as seeds, allowing the seeds to absorb water-insoluble low-mole...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G12/12C08J3/12C08L61/24
Inventor 郝志显程艺艺
Owner TONGJI UNIV
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