Polyureas microcapsule and its preparation method

A technology of microcapsules and polyurea, which is applied in the field of preparation of polyurea microcapsules, can solve the problems of insufficient safety, unfriendly environment, high toxicity and volatility, and achieve high safety, low toxicity and volatility, Quick and thorough effect

Inactive Publication Date: 2009-08-19
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there is a defect in the technology disclosed in the above-mentioned patents that toluene diisocyanate (TDI) is used as the raw material for interfacial reaction, so the toxicity and volatility are relatively high, the safety is not enough, and the environment is not friendly enough

Method used

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  • Polyureas microcapsule and its preparation method
  • Polyureas microcapsule and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] 0.45g of Tween 80 (Tween80) was completely dissolved in 75ml of distilled water, and it was divided into two portions of 62.5ml and 12.5ml for later use.

[0023] A mixture of 4,4-diphenylmethane diisocyanate and 2,4-diphenylmethane diisocyanate, wherein the weight of 2,4-diphenylmethane diisocyanate is 40±5%,

[0024] Add 25ml of organic solvent cyclohexane and 2g of diphenylmethane diisocyanate to 62.5ml of the above-mentioned Tween 80 aqueous solution, and transfer all the solution into a three-necked flask, stir, emulsify into emulsion A, and use the remaining 12.5ml Add Tween 80 aqueous solution and 0.5g diethylenetriamine (DETA) to form solution B, add B to emulsion A, and initiate interfacial polymerization reaction on the water-oil interface.

[0025] The reaction temperature was 25° C., and the reaction was carried out for 4 hours.

[0026] After the reaction is completed, take a fresh microcapsule suspension sample to observe and take pictures under an optica...

Embodiment 2

[0029] 0.45g of polyvinyl alcohol (PVA) was dissolved in 75ml of distilled water, and it was divided into two parts of 62.5ml and 12.5ml for later use.

[0030] Add 25ml of the prepared organic solvent butyl acetate and 0.5g of diphenylmethane diisocyanate to 62.5ml of the above-mentioned PVA aqueous solution, and transfer all the solution into a three-necked flask, stir, and emulsify into a water-in-oil emulsion A , the remaining 12.5ml of PVA distilled water plus 0.2g of diethylenetriamine (DETA) was made into a solution, slowly added to the emulsion system, and interfacial polymerization was initiated on the water-oil interface.

[0031] The reaction temperature was controlled at 30° C., and the reaction was carried out for 3.5 hours. The processing after completion of the reaction is the same as in Example 1. figure 2 Be the optical micrograph of the polyurea microcapsule suspension of embodiment 2.

[0032] The average particle size of the microcapsules prepared in thi...

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Abstract

The invention provides a polyurea microcapsule and a preparation method thereof. The preparation method comprises the following steps: (1) adding an organic phase containing diphenylmethane diisocyanate to an aqueous phase containing a surfactant, stirring and emulsifying to obtain emulsion A (2) Diethylenetriamine is added to an aqueous solution containing a surfactant to obtain a continuous phase solution B; (3) The continuous phase solution B is added to emulsion A to initiate interfacial polymerization on the oil-water interface to obtain polyurea microcapsules containing suspension. The method of the present invention adopts diphenylmethane diisocyanate, the toxicity and volatility are relatively small, and the impact on environmental hazards and experimental operations is small. The present invention directly adds diethylenetriamine after the emulsion is formed, and the reaction is more rapid and thorough. The efficiency is also higher, so that the cost is further reduced. This method adopts a one-step direct reaction, and the temperature can be controlled at room temperature without further heating, and the energy consumption of the whole process is very low.

Description

technical field [0001] The invention relates to a preparation method of polyurea microcapsules, in particular to microcapsules prepared by interfacial polymerization. Background technique [0002] Microcapsules are tiny particles of nanometer or micrometer scale formed by covering the core material with a membrane. Both interfacial polymerization and in-situ polymerization are more classic methods for preparing polyurea microcapsules, such as preparing polyurea or polyurethane microcapsules with toluene diisocyanate (TDI) [William T.(GeneralMotors Corporation).US 4076774.1978 ], with urea and formaldehyde as raw materials to prepare urea-formaldehyde resin microcapsules [Peter L. (NCR Corporation).US 4089802.1978]. [0003] The relatively big problems of the polyurea microcapsules prepared by these two methods are the stability of the microcapsules during formation and storage, and the toxicity and volatility of toluene diisocyanate (TDI), which is very harmful to the envir...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J13/16
Inventor 许志美吴继峰张濂
Owner EAST CHINA UNIV OF SCI & TECH
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