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: 2008-02-20
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This technology improves the shape and size distribution of tiny capsules made from plastic material by adding certain chemical agents before forming them with other ingredients like solvent or resin solution. These modifications help prevent damage during storage while maintaining their effectiveness over longer periods at ambient temperatures. Additionally, this new technique allows for faster and complete reactions without requiring excessive thermal input. It also reduces costs compared to traditional methods that require multiple steps such as mixing two liquids together followed by curing under specific conditions.

Problems solved by technology

This patents discusses various technical problem addressed in this patented method: the instability and potential health hazards associated with use of certain chemical compounds like toluene dianiline (TDA); while also being able to create safe and ecofriendly products due to its low cost compared to other reagent options.

Method used

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  • 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 is an optical micrograph of the polyurea microcapsule suspension of Example 2.

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

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Abstract

The invention provides a polyurea micro capsule and the preparing method thereof. The preparing method comprises the following steps:(1) Add the organic phase with diphenylmethane diisocyanate into the water phase which contains surface promoting agent and agitate, emulsificate to obtain the latex A; (2) Add the diethylenetriamine into the water solution which contains surface promoting agent to obtain the continuous phase solution B; (3) Add the continuous phase solution B into the latex A to rouse the interface polymerization reaction on the oil and water interface to obtain the suspension which contains the polyurea micro capsule. The method of the invention adopts the diphenylmethane diisocyanate and has a small toxicity and volatilization, and has small influence to the environment and the experiment operation. The invention can add the diethylenetriamine directly after the latex is formed; therefore the invention has quick and utterly reaction, a high efficiency and can reduce the cost. The invention adopts the one step directly reaction and the temperature can be controlled in room temperature; and the invention needs no other temperature rising, therefore the whole process has a low energy consumption.

Description

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Claims

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Application Information

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Owner EAST CHINA UNIV OF SCI & TECH
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