Polyurea capsule with composite wall and high core content and preparation method thereof

A technology of capsule core and polyurea, which is applied in the field of preparation of phase change energy storage capsules, can solve the problems of low content of microcapsule capsule core and residual organic co-solvent, etc., and achieve the effect of increasing effective content and enhancing mechanical strength

Inactive Publication Date: 2011-04-06
SHENZHEN GRADUATE SCHOOL TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In order to overcome the problems such as the low content of the microcapsule capsule core with polyurea as the capsule wall and the residual organic cosolvent, the present invention provides a kind of cosolvent with reactive monomers or adding substances with the same function as the capsule core (i.e. Commonly referred to as organic co-solvent), the preparation method of polyurea composite capsule wall capsule with high capsule core content, and the capsule product prepared by this method

Method used

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  • Polyurea capsule with composite wall and high core content and preparation method thereof
  • Polyurea capsule with composite wall and high core content and preparation method thereof
  • Polyurea capsule with composite wall and high core content and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] 1. Preparation of oil phase, water phase A and water phase B

[0035] Mix 3.0 g of toluene diisocyanate, 2.5 g of styrene, 0.5 g of divinylbenzene, 0.05 g of azobisisobutyronitrile and 10.0 g of n-octadecane to obtain an oil phase.

[0036] 4.0 g of a styrene-maleic anhydride copolymer was dissolved in 100.0 g of distilled water to prepare an aqueous phase A (that is, an aqueous emulsifier solution).

[0037] Aqueous phase B was prepared by dissolving 3.0 g of diethylenetriamine in 100.0 g of distilled water.

[0038] 2. Add dropwise or pour the oil phase solution into the water phase A solution, stir and emulsify at a high speed at 35°C and 4000 rpm for 10 minutes to prepare an O / W emulsion.

[0039] 3. Stir the O / W emulsion at a speed of 400 rpm, and at the same time add the aqueous phase B solution to the O / W emulsion dropwise.

[0040] 4. After the dropwise addition, the temperature was raised to 50° C., and the reaction was continued for 3.0 hr.

[0041] 5. Raise ...

Embodiment 2

[0047] 1. Preparation of oil phase, water phase A and water phase B

[0048] 20.0 g of toluene diisocyanate, 70.0 g of n-octadecane, and 10.0 g of butyl octadecanoate were uniformly mixed to obtain an oil phase.

[0049] 30.0 g of a styrene-maleic anhydride copolymer was dissolved in 700.0 g of distilled water to prepare an aqueous phase A.

[0050] 15.0 g of tetraethylenepentamine was dissolved in 300.0 g of distilled water to prepare an aqueous phase B.

[0051] 2. Add dropwise or pour the oil phase solution into the water phase A solution, stir and emulsify at a high speed at 35°C and 4000 rpm for 10 minutes to prepare an O / W emulsion.

[0052] 3. Stir the O / W emulsion at a speed of 600rpm, and at the same time add the aqueous phase B solution to the O / W emulsion dropwise.

[0053] 4. After the dropwise addition, the temperature was raised to 50° C., and the reaction was continued for 3.0 hr.

[0054] 5. Suction filtration, washing and drying the prepared capsules, the p...

Embodiment 3

[0057] 1. Preparation of oil phase, water phase A and water phase B

[0058] Mix 5.0 g of toluene diisocyanate, 3.5 g of styrene, 1.5 g of divinylbenzene, 0.08 g of benzoyl peroxide and 40.0 g of rose essence to obtain an oil phase.

[0059] 10.0 g of a styrene-maleic anhydride copolymer was dissolved in 200.0 g of distilled water to prepare an aqueous phase A.

[0060] Aqueous phase B was prepared by dissolving 5.0 g of hexamethylenediamine in 100.0 g of distilled water.

[0061] 2. Pour the oil phase solution into the water phase A solution, stir and emulsify at a high speed at 8000 rpm for 10 minutes at room temperature to prepare an O / W emulsion.

[0062] 3. Stir the O / W emulsion at a speed of 400 rpm, and at the same time add the aqueous phase B solution to the O / W emulsion dropwise.

[0063] 4. After the dropwise addition, the temperature was raised to 50° C., and the reaction was continued for 3.0 hr.

[0064] 5. Then raise the temperature to 85°C, react and mature f...

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Abstract

A preparation method of a polyurea capsule with composite wall and high core content comprises the following steps: (1) uniformly mixing 100 parts of oily substances, 10-30 parts of polyisocyanates, 8-25 parts of styrene, 3-5 parts of divinylbenzene and 0.1-0.3 parts of initiator azodiisobutyronitrile or benzoyl peroxide to prepare oil phase; dropwise adding the oil phase to 500-1200 parts by weight of emulsifier aqueous solution with concentration of 1-10wt% and stirring the mixture at high speed to fully emulsify the oil phase to prepare O / W emulsion; (2) stirring the emulsion at 100-1000rpm and simultaneously dropwise adding 500-1100 parts by weight of polyamine aqueous solution with concentration of 2-5wt% to the emulsion; and (3) after dropwise adding the polyamine aqueous solution, raising the temperature to 30-60 DEG C and maintaining the temperature for 1-3hr; then raising the temperature to 75-95 DEG C and curing the mixture for 1-3hr and obtaining the capsule powder through pumping filtration, washing and drying. The capsule has the following advantages: the capsule adopts the reactive monomer as the cosolvent or adds the substance with the same functions as the core to serve as the cosolvent to replace the traditional organic cosolvent with low boiling point, has core content as high as 60-90wt% and avoids harms to human and the environment caused by using the organic solvent.

Description

technical field [0001] The invention relates to a polyurea capsule with a high capsule core content and its processing and preparation technology, in particular to a preparation method of a phase-change energy storage capsule with polyurea as the main coating material and its product. Background technique [0002] Capsules are sealed particles made by wrapping capsule core materials with protective wall materials such as organic materials, inorganic materials or metal materials, and are mainly used to adjust or change the appearance or properties of the original capsule core materials. For example, the phase change energy storage capsule realizes the permanent solidification of the phase change material, solves the problems of leakage of the phase change material and its interface with the surrounding material, prolongs the service life of the material, and makes the application of the phase change material more convenient. Microcapsule (particle size from 1 micron to 1 mm) ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J13/02
Inventor 李伟唐国翌
Owner SHENZHEN GRADUATE SCHOOL TSINGHUA UNIV
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