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Preparation method of foamed microcapsules using polyurethane as wall material

A technology of polyurethane and microcapsules, which is applied in the fields of chemical industry and materials, can solve the problems of high toxicity, production, storage, transportation, use restrictions, etc., and achieve the effect of simple preparation method, environmental friendliness and strong controllability

Inactive Publication Date: 2019-01-18
CHANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The monomer is highly toxic, and its production, storage, transportation, and use are strictly restricted

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] (1) Preparation of polyurethane prepolymer

[0033] Add 1.91g (0.036mol) of diethylene glycol and 0.6g (0.009mol) of 2,2-dimethylolpropionic acid into the reaction vessel, dehydrate at 120°C for 30 minutes, cool to room temperature and add IPDI 10g (0.09mol) and 2 drops of dibutyltin dilaurate were reacted at 105°C for 5 hours to obtain a polyurethane prepolymer. Viscosity increases in the process, adds butanone 6g, reduces prepolymer viscosity.

[0034] (2) Preparation of foaming agent polyurethane prepolymer dispersion

[0035] When the temperature of the prepolymer drops below 50°C, add 0.384g (0.0038mol) of triethylamine and stir evenly, then add 6g of n-hexane dropwise, and stir to disperse. Finally, add 74 g of deionized water, stir and disperse to obtain foaming agent polyurethane prepolymer dispersion.

[0036] (3) Preparation of foamed microcapsules with polyurethane as wall material

[0037] 2.9 g (0.0675 mol) of piperazine was dissolved in 11.6 g of water, ...

Embodiment 2

[0039] (1) Preparation of polyurethane prepolymer

[0040] Add 1.84g (0.0353mol) of neopentyl glycol and 0.65g (0.0097mol) of 2,2-dimethylol propionic acid into the reaction vessel, dehydrate at 120°C for 30 minutes, cool to room temperature and add IPDI 10g ( 0.09mol) and 2 drops of bismuth neodecanoate were reacted at 105°C for 5 hours to obtain a water-based polyurethane prepolymer. Viscosity increases in the process, adds methyl ethyl ketone 6g altogether, reduces prepolymer viscosity.

[0041] (2) Preparation of foaming agent polyurethane prepolymer dispersion

[0042] When the temperature of the prepolymer drops below 50°C, add 0.384g (0.0038mol) of triethylamine and 5g (0.045mol) of IPDI, stir evenly, then add 8.7g of n-hexane dropwise, and stir to disperse. Finally, add 105 g of deionized water, stir and disperse to obtain foaming agent polyurethane prepolymer dispersion.

[0043] (3) Preparation of foamed microcapsules with polyurethane as wall material

[0044] 5...

Embodiment 3

[0046] (1) Preparation of polyurethane prepolymer

[0047] Add 1.62g (0.036mol) of 1,4-butanediol and 0.6g (0.009mol) of 2,2-dimethylolpropionic acid into the reaction vessel, dehydrate at 120°C for 30 minutes, cool to room temperature and add 10 g (0.09 mol) of IPDI and 2 drops of bismuth neodecanoate were reacted at 105° C. for 5 hours to obtain a water-based polyurethane prepolymer. Viscosity increases in the process, adds methyl ethyl ketone 6g altogether, reduces prepolymer viscosity.

[0048] (2) Preparation of foaming agent polyurethane prepolymer dispersion

[0049] When the temperature of the prepolymer drops below 50°C, add 0.384g (0.0038mol) of triethylamine and 5g (0.045mol) of IPDI, stir evenly, then add 7g of cyclohexane dropwise, and stir to disperse. Finally, add 97 g of deionized water, stir and disperse to obtain foaming agent polyurethane prepolymer dispersion.

[0050] (3) Preparation of foamed microcapsules with polyurethane as wall material

[0051] 1...

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Abstract

The invention relates to a preparation method of foamed microcapsules using polyurethane as a wall material. The preparation method comprises the following steps: carrying out reaction on a diisocyanate monomer, a small molecule dihydric alcohol, macromolecule dihydric alcohol and a hydrophilic monomer to synthesize an isocyanate-terminated polyurethane prepolymer, and then dispersing a foaming agent in the polyurethane prepolymer, adding water to prepare a foaming agent (polyurethane prepolymer dispersion liquid), and finally, preparing the foamed microcapsules using polyurethane as the wallmaterial by an interfacial polymerization method with a water-soluble amine. The preparation method has the beneficial effects that the invention provides a method for preparing the foamed microcapsules using polyurethane as the wall material by an aqueous polyurethane prepolymer and a water-soluble amine through an interfacial polymerization method; the foamed microcapsules prepared by the invention has the characteristics of simple preparation method, strong controllability, and adjustment of the performance of the foamed microcapsules according to the field of use, and environmental protection.

Description

technical field [0001] The invention belongs to the fields of chemical industry and materials, and relates to a method for preparing foamed microcapsules with polyurethane as the wall material. Background technique [0002] Microcapsules use film-forming substances as the capsule wall to isolate the embedded substances from the external environment, thereby protecting the highly reactive, sensitive or volatile embedded substances in the capsule. Under appropriate conditions, microcapsules can release internal substances, so they have been widely used in chemical, food, pharmaceutical, cosmetic, textile and other fields. The wall material of the microcapsule is usually a natural or synthetic polymer, an inorganic substance or a composite of various materials, and the thickness is generally several hundred nanometers to several hundred micrometers, and the size of the formed microcapsules is usually on the order of micrometers to millimeters. [0003] Foaming microcapsules (a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J9/32C08J9/14C08G18/75C08G18/34C08G18/32
CPCC08G18/3206C08G18/348C08G18/755C08J9/141C08J9/32C08J2203/14C08J2203/22C08J2475/04
Inventor 李坚白雪尧芬任强汪称意
Owner CHANGZHOU UNIV