US 7,442,410 B2Granted

Method for encapsulating phase transitional paraffin compounds using melamine-formaldehyde and microcapsule resulting therefrom

AssigneeNano-Sports Technologies Ltd.

InventorsJianwei Xing, Yi Li, Edward Newton

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Abstract

A process for the microencapsulation of phase transitional paraffin compounds is described. Polypropylene glycols with the average molecule weight over 400 were used as the surface tension modifiers for emulsifying the paraffin compounds. Polyisocyanates capable of being dissolved in the phase change materials were employed to promote the deposition of melamine, partially methylolated melamine and the precondensate of melamine-formaldehyde onto the hydrophobic droplets for the microencapsulation. The prepared emulsion of microencapsulated phase change materials was successfully coated on textile fabrics and the coated products showed improved thermal regulation function.

Claims32

Dependent claims

A method for encapsulating a core component comprising paraffin compounds that can undergo phase transition, comprising the steps of:

A dissolving first monomers of the core component to form a first solution, said first monomers forming a first polymer;
B dispersing the first solution into a second aqueous solution to form an emulsion;
C adding said emulsion to a third aqueous solution containing a precondensate of melamine-formaldehyde to form an encapsulation mixture by in situ condensation microencapsulation,
wherein
said first monomers comprise a polypropylene glycol with an average molecular weight higher than about 400 and a polyisocyanate soluble in said core component;
and
said core component is encapsulated with a polyurethane layer, a polyurea layer and an aminoplast layer.

4 more elements

Dependencies are inferred from the claim text.