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High-temperature-resistant polyurethane microcapsule as well as preparation method and application thereof

A polyurethane microcapsule, high temperature resistant technology, applied in the polymer field, can solve the problems of food aroma and taste influence, slow release of core material, aroma loss, etc., and achieves the effects of high encapsulation rate, simple process and low preparation cost

Pending Publication Date: 2021-07-02
DONGGUAN BOTON FLAVORS & FRAGRANCES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, flavors are usually compounds with low molecular weight, low boiling point, and high volatility. During high-temperature processing, the aroma of flavors volatilizes quickly and the aroma is seriously lost, which greatly affects the aroma and taste of the final food; it is used in tobacco and mosquito coils. In the industry, it is required that the microcapsules can slowly release the core material under high temperature conditions during use.
Traditional microcapsules with high temperature resistance include gelatin-gum arabic microcapsules, urea-formaldehyde resin microcapsules or melamine resin microcapsules, but the use of formaldehyde will be involved in the preparation process, which will cause formaldehyde problems accordingly

Method used

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  • High-temperature-resistant polyurethane microcapsule as well as preparation method and application thereof
  • High-temperature-resistant polyurethane microcapsule as well as preparation method and application thereof
  • High-temperature-resistant polyurethane microcapsule as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0083] PEG400 (7.5 mmol, 3 g) was dissolved in 30 mL of acetone, and hexamethylene diisocyanate (HDI, 10 mmol, 1.68 g) was added to react for 1 h to prepare a prepolymer. Mix 5g of essence and prepolymer evenly, and add it to the aqueous solution of Tween 80 (2g of Tween 80 dissolved in 30mL of water) under room temperature and rapid stirring to form an oil-in-water emulsion system; 3000r / min After emulsification for 1 hour, chain extender ethylene glycol (4.4 mmol, 0.27 g) was added, reacted at 60°C for 30 minutes, then lowered to room temperature and stirred for 6 hours; obtained after dialysis, centrifuged, and the lower layer of the emulsion was freeze-dried to obtain the product.

Embodiment 2

[0085] PEG400 (5 mmol, 2 g) was dissolved in 30 mL of acetone, and isophorone diisocyanate (IPDI, 7.2 mmol, 1.6 g) was added to react for 1 h to prepare a prepolymer. Mix 2g of essence and prepolymer evenly, and add it to the aqueous solution of Tween 80 (2g of Tween 80 dissolved in 30mL of water) under room temperature and rapid stirring to form an oil-in-water emulsion system; 3600r / min After emulsifying for 1 hour, add 0.27 g of chain extender ethylene glycol, react at 60°C for 30 minutes, and then lower it to room temperature and stir for 6 hours; take it after dialysis, centrifuge, and freeze-dry the lower emulsion to obtain the product.

Embodiment 3

[0087]Mix and stir lavender essential oil 5.2g and isophorone diisocyanate (IPDI, 11.7mmol, 2.6g) evenly to form an oil phase; pour the oil phase into 100mL aqueous solution containing 1% polyvinyl alcohol, and stir at 10000r / min for 7min , then add 0.15% sodium alginate aqueous solution 100mL, then add PEG400 (9.6mmol, 3.84g), catalyst dibutyltin dilaurate 0.23g, stir at room temperature for 1h; add chain extender ethylene glycol (1.44 mmol, 0.09g), 5000r / min refrigerated centrifugation after 1h, get the bottom milky white precipitate, freeze-dry, obtain the microcapsule product of fluffy solid pore-like structure.

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Abstract

The invention relates to a high-temperature-resistant polyurethane microcapsule, which comprises a core material and a capsule material coating the core material, the core material is at least one of essence and a volatile medicament, and the capsule material is prepared from the following raw materials: a first monomer, a second monomer, a surfactant and a chain extender; and the first monomer is a diisocyanate compound, the second monomer is polyethylene glycol, and the chain extender is ethylene glycol. A diisocyanate compound is used as a first monomer, polyethylene glycol is used as a second monomer, a prepolymer is obtained through reaction, ethylene glycol is further used as a chain extender to prepare the polyurethane microcapsule, the microcapsule has the characteristic of high-temperature resistance, the core material is slowly released under the condition of high temperature, and the release time under the condition of high temperature is effectively prolonged.

Description

technical field [0001] The invention relates to the field of polymers, in particular to a high-temperature resistant polyurethane microcapsule and its preparation method and application. Background technique [0002] With the improvement of people's quality of life, in industries such as tobacco and food, what people pursue is no longer limited to taste, but also has requirements for smell to a certain extent. [0003] Polyurethane material has a large degree of freedom in molecular design, making it easy for finished products to have different physical properties, and has excellent biocompatibility, good adhesion and degradability. Microencapsulation technology is to completely cover a target object (core or inner phase) with a continuous film (wall or outer phase) of various natural or synthetic polymer compounds, without any damage to the original chemical properties of the target object. , and then gradually through some external stimuli or sustained release, the functi...

Claims

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Application Information

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IPC IPC(8): B01J13/18B01J13/16C08G18/66C08G18/10C08G18/48C08G18/32
CPCB01J13/16B01J13/18C08G18/6674C08G18/10C08G18/3206Y02A50/30
Inventor 莫森翔李凯伦骆声秀罗兆炜
Owner DONGGUAN BOTON FLAVORS & FRAGRANCES