Polyurethane Phase-Change Nanocapsules for Sealant Viscosity Control
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Solution Overview
Problem
Current phase-change microcapsules are not suitable for polyurethane adhesives due to particle size issues and poor compatibility with polyurethane bodies, leading to low cycle life and increased colloid viscosity, which affects the uniformity and effectiveness of phase-change polyurethane pouring sealants.
Innovation Solution
The development of polyurethane phase-change nanocapsules coated with an amphiphilic block copolymer, composed of a polyurethane chain segment and a methoxy polyethylene glycol chain segment, which are synthesized using specific reaction conditions to achieve a particle size of 100 nm to 200 nm and high embedding ratios of phase-change materials, overcoming compatibility issues and enhancing dispersion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional phase-change microcapsules (micrometer level) are used in polyurethane adhesive, then phase-change material encapsulation is achieved, but particle size is too large for good dispersion and compatibility with polyurethane body is poor
Solution Approach 1:
The patent divides the phase-change microcapsule into nanoscale segments (100-200 nm) rather than using traditional micrometer-sized capsules. This segmentation enables better dispersion within the polyurethane adhesive matrix while maintaining the encapsulation function, directly resolving the contradiction between encapsulation reliability and compatibility/adaptability.
Solution Approach 2:
The patent changes the critical parameter of capsule size from micrometer level to nanometer level (100-200 nm). This parameter change fundamentally improves both dispersion characteristics and compatibility with polyurethane bodies, while the encapsulation function is maintained through the nanocapsule structure.
2Reliability
If phase-change microcapsules with larger particle size are used, then encapsulation is achieved, but dispersion uniformity is poor and colloid viscosity increases sharply
Solution Approach 1:
By segmenting the phase-change material into nanoscale capsules (100-200 nm) rather than larger microcapsules, the patent achieves uniform dispersion within the polyurethane colloid. The nanoscale size allows the capsules to distribute evenly throughout the matrix without causing sharp viscosity increases, maintaining colloid stability and uniformity.
Solution Approach 2:
The patent changes the particle size parameter from micrometer to nanometer scale, which fundamentally alters the dispersion behavior. This parameter change enables the phase-change capsules to integrate uniformly into the polyurethane colloid, preventing viscosity sharp increases and maintaining composition stability.
3Reliability
If conventional phase-change materials are used, then phase-change function is achieved, but thermal conductivity is insufficient for electronic industry demands
Solution Approach 1:
The patent creates a composite nanocapsule structure combining phase-change material core with polyurethane shell, and integrates this into a polyurethane adhesive matrix containing thermal conductive fillers. This composite approach maintains the phase-change function while enhancing thermal conductivity to meet electronic industry requirements.
Solution Approach 2:
The patent changes the thermal conductivity parameter by incorporating thermal conductive fillers and optimizing the nanocapsule structure. This parameter enhancement allows the material to maintain phase-change functionality while achieving the thermal conductivity levels required for electronic applications.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The polyurethane phase-change nanocapsules improve the thermal conductivity and phase-change enthalpy of polyurethane pouring sealants, ensuring low viscosity and enhanced application potential in electronic engineering fields, particularly in high-end electronics requiring temperature control.
Implementation Method 1
formed by coating a phase-change material with an amphiphilic block copolymer
Implementation Method 2
coating a phase-change material with an amphiphilic block copolymer
Implementation Method 3
Phase-change materials (PCM) emerged in the 1970s due to the demand for aerospace. It is a material that can achieve temperature control by storing and converting thermal energy through conversion between different phases
Implementation Method 4
the polyurethane phase-change nanocapsules improve the thermal conductivity and phase-change enthalpy of polyurethane pouring sealants
Data Source
AI summary
Provided are a polyurethane phase-change nanocapsule, a phase-change polyurethane pouring sealant and a preparation method therefor. The polyurethane phase-change nanocapsule is a nanocapsule formed by coating a phase-change material with an amphiphilic block copolymer. The oleophilic end of the amphiphilic block copolymer is a polyurethane chain segment, and the hydrophilic end is a methoxy polyethylene glycol chain segment. The polyurethane phase-change nanocapsule is added, such that the two-component phase-change polyurethane pouring sealant has a temperature control advantage, and has an excellent enthalpy value and heat-conducting properties while maintaining a low viscosity. In the field of electronic engineering, particularly in the field of electronics needing temperature control, the pouring sealant has an application value.