Design of a novel multilayer low‐temperature protection composite based on phase change microcapsules

Abstract

It is necessary to develop a novel low-temperature protective material that ensures the flexibility and warmth of operation in a short time under the low-temperature environment (−30 to −80 C). Hence, a novel multilayer low-temperature protection composite (MPC) was prepared based on phase change microcapsules (microPCMs). MicroPCMs containing n-octadecane with melamine-urea-formaldehyde shell were successfully synthesized through in situ polymerization. Then the microPCMs were finished on the basic fabric's surface (biocomponent spunbond-spunlace nonwoven material) by foam coating and the silicone rubber was covered on the outermost surface. On the basis of scanning electron microscope (SEM) micrographs, microPCMs had a relatively spherical shape and a smooth surface, in which the average particle size was about 42.77 μm. The cross section morphology showed that the MPC was consisted of three layers structure including the base fabric, the microPCMs layer, and the silicone rubber layer. At −50 C, the low-temperature resistance time of the MPC was 727 s and the power consumption for maintaining a certain temperature for 10 and 20 min of the MPC were 350.86 and 1392.66 J, respectively. Compared with the basic fabric, which has the same thickness as the MPC, the low-temperature resistance time of the MPC was prolonged about 5 min and the power consumption of the MPC for 10 min decreased by 55%, and for 20 minutes decreased by 33%, respectively. The MPC could guarantee the low-temperature protection effect in short time. It could be applied as the potential materials in the area of low-temperature protection.

Reliable phase‐change polyurethane crosslinked by dynamic ionic‐bond crosslinking for thermal energy storage

“…In contrast to pure PEG, the ionic crosslinked PU‐CH‐NH can maintain its initial shape after exposed at 80 °C for 30 min; 80 °C was chose as operation temperature, since it is higher than the melting point of pristine PEG. These results mean that the presence of ionic crosslinking in polymer network can help to prevent the molten PEG from leakage …”

“…The demand for green energy is increasing dramatically because of the energy crisis, high cost of fossil fuels, and the accompanied environmental problems since the energy crisis during last decades . It is reported that using renewable energy to replace conventional petroleum energy is imperative.…”

The Design and Manufacture of a Multilayer Low-Temperature Protective Composite Fabric Based on Active Heating Materials and Passive Insulating Materials

“…The main principle of this equipment has been described in the previous literature [27]. The specific operating steps for the test were as follows: The sample of a certain size was placed in an oven for thermal balance.…”

“…With the addition of microPCMs, the low-temperature resistance duration was prolonged, at an environment of −15 °C, −30 °C, −40 °C, and −60 °C, compared to pure fabric. To further improve the low-temperature protection performance, we also coated the outermost layer with silicone rubber [27]. Although silicone rubber has certain thermal insulation properties, it is obviously heavier than the commonly used textile material under the same volume conditions.…”

Phase Change Material (PCM) Microcapsules for Thermal Energy Storage

“…For observation statistics, scanning electron microscopy (SEM) and optical microscopy (OM) were first used to take images of a number of microcapsules randomly and the size distribution was then statistically determined by measuring the diameter of each microcapsule. Sun et al combined SEM micrographs with Image-Pro analysis software to analyze the particle size distribution of microcapsules [118]. By measuring more than 200 microcapsules, the particle size was found to range from 10 μm to 74 μm with a mean diameter of 42.77 μm.…”