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Phase change material textile

Phase change material textile application, let me take a "0" energy consumption air conditioner

Tips: what is phase transition?

In nature, the state of matter mostly exists in the form of gas, liquid and solid, and each state of matter can be called a "phase state". When a substance exchanges heat with the external environment and reaches a "special temperature critical point", the physical state of the substance will change from one phase state to another. The process of this transformation is called "phase transition". The special temperature of phase transition is "phase transition temperature", and the material that can take place this process is called "phase change material".

Principles of phase change materials

Phase change material (PCM) is a kind of material that can absorb, store and release energy through latent heat of phase change. When the phase state of energy storage micro unit changes, its temperature almost remains unchanged, and it absorbs or releases a lot of latent heat, so as to achieve functional requirements. By encapsulating phase change materials in nano micron scale cells, the micro cell and phase state change of materials can be controlled, which greatly expands the application field of materials. This magical new material has a very broad application prospect, such as textiles, aerospace, transportation, agriculture, national defense, building materials, solar energy system, military, refrigeration equipment and medical equipment.


Application of phase change material textiles

At present, for the research and application of textile materials, micro energy storage units with suitable phase change point can be implanted into fabrics and fibers or coated to become intelligent two-way temperature regulating clothing with temperature regulating units. Sportswear or underwear produced with this kind of fiber can regulate body temperature and improve blood microcirculation. Other applications include fragrance capsules, anti mosquito capsules, and thermal functional fluids.

The intelligent temperature regulation mechanism of phase change energy storage fiber is: when the human body is in the stage of intense activity, it will produce more heat, and use phase change materials to store these heat. When the human body is in the static period, the heat stored by phase change materials will be slowly released to maintain the constant temperature in the clothing.


Microencapsulation technology of phase change temperature regulation

There are four common methods for the application of phase change materials in textiles, including hollow fiber impregnation filling method, fabric finishing method, spinning method and microcapsule treatment method. The application of microcapsule technology overcomes the limitations of phase change materials and improves its efficiency. Microencapsulation of phase change materials can not only effectively increase the heat conduction area, reduce the reaction between phase change materials and the external environment, but also control the change of material volume when phase change occurs. Intelligent temperature regulation is its main function.

When phase change materials are used in clothing, the temperature range of phase change should be similar to that of human body, so as to keep constant skin temperature. The phase change temperature of phase change materials used in general clothing is 25 ~ 29 ℃. The phase change temperature of phase change materials is too high to cool down, and too low will cause discomfort and even disease. In addition, the bionic temperature regulating fiber can not only automatically adjust the clothing temperature according to the weather changes, but also flexibly adjust the water vapor permeability, quickly discharge moisture, and has high waterproof and windproof functions.

The mechanism is latent heat

When the human body is in intense exercise, the body will produce a lot of heat, which will be absorbed and stored by phase change materials;

When the human body is at rest, the phase change material will slowly release the stored heat, which is used to keep the temperature constant in the clothing.





Outlast PCM Phase Change Material

Technology

Outlast® technology, originally developed for NASA, utilizes phase change materials (PCM) that absorb, store and release heat for optimal thermal comfort.   Outlast® technology is comparable to ice in a drink; as it changes from solid to liquid, it absorbs heat and cools the drink, keeping that drink at the desired temperature for longer. Outlast® phase change materials work in the same way, but are microencapsulated to be permanently enclosed and protected in a polymer shell. We call microencapsulated phase change materials Thermocules™.

This encapsulation process makes the Thermocules™ exceptionally durable for many applications. These Thermocules™ can be incorporated into fabrics and fibers and have the capacity to absorb, store and release excess heat.   This gives any product containing Outlast® technology the ability to continually regulate skin’s microclimate. As the skin gets hot, the heat is absorbed, and as it cools, that heat is released.

Outlast® technology is not wicking technology, which manages moisture by reacting to your sweat and pulling it away from the skin. Outlast® technology will proactively manage heat while controlling the production of moisture before it begins. That's the Outlast® difference - please have a look at a short video.

Applying Outlast® technology to your line

Whether you want to purchase Outlast® fabrics from us or you want to source fibers and knits direct from one of our certified spinners or mills, Outlast is ready to work with you.


There are different ways to incorporate Outlast® technology depending on the end product and the performance you want to obtain:


Coating

Outlast® coated materials offer a higher capacity to store heat than any of our other applications. They are intended to be used in products that are not in direct contact with the skin i.e. outerwear, footwear, bedding, seating, etc. A wide range of materials can be coated. For example many products (e.g. bedding) use non-wovens that have been coated, while in jackets Outlast® technology can be coated onto the actual lining. Outlast® coated materials can also be applied to mid-layers put between the first layer and the lining. In this case manufacturers are free to choose any design and first layer they want.



Fibers

Outlast® phase change materials can be located inside the fiber. The fibers are spun into yarns being manufactured then into fabrics or finished products such as socks or beanies. In-fiber applications are for products being worn next to or very close to the skin.


Acrylic

Since its debut in 1994, the Outlast® acrylic fiber has been used in a variety of products including socks, hats and sweaters.

Features:

* Dyes well with superb fastness
* Exceptional resistance to sunlight degradation
* Highly resilient with good resistance to abrasion
* Quick drying


Viscose

Outlast® viscose, better known in the US as "rayon", is an extremely versatile fiber. Common products that utilize this fiber are underwear, shirts, dresses, sleepwear, work wear and sportswear.

Features:

* Easy to dye (good color brilliance)
* Provides softness and comfort similar to cotton or silk
* Available in various staple lengths
* Antistatic


Polyester

Outlast® polyester fiber is based on a new and novel process: the polyester melt spun bicomponent process uses a PCM core with standard polyester as the sheath. This delivers a temperature managing fiber without compromising standard polyester fiber downstream processing, dyeing and finishing properties.

Features:

* Available in various staple lengths
* Combines well with other fibers
* Can be finished with various technologies

Matrix Infusion Coating

An advanced formulation of Outlast® Thermocules™ is finely printed onto flat fabric. This process is ideal for brands seeking a larger volume program using their own fabrics. Outlast® MIC is intended for products worn next to skin and is perfect for the active, casual and sportswear markets. It can also be used on many fabrics.

Features:

  • durable through multiple washes

  • hand feel is unchanged

  • wicking and wicking durability controlled by base fabric

  • does not affect drape of the fabric

Quickly distribute and spread heat

The Xelerate product line by Outlast® is designed for any product with an advanced demand for temperature and moisture regulation - from bedding to outdoor apparel.

Similar to a “distribution booster”, Xelerate fabrics combine phase change material with an additional heat-spreader technology to dissipate excess heat much faster and make the PCM process more active and efficient.


PCM + heat spreader are teaming up

PCMs absorb excess heat. The heatspreader technology helps to transport and spread the heat away from the source quickly. The PCMs at the heat source can regenerate faster and have a greater ability to reduce overheating.

In lab tests, we have proven that with the help of Outlast® Xelerate technology, the thermal conductivity can be increased by up to 30%. The advantage for consumers is obvious: With Xelerate, sweating is reduced even more and the heat and moisture management is working more effectively.

Among others, bedding products and active wear benefit ideally from Outlast® heat spreader technology.

Farewell to night sweat and hot flushes

During the night, many people suffer from “intolerable heat build-up”, which makes it difficult to get a restful night’s sleep. Outlast’s climate-regulating phase change materials (PCM) which absorb, store and release excess body heat to reduce overheating and sweating, are a great solution to this.

For bedding products that are targeted to customer segments with an advanced demand for temperature and moisture regulation, the Xelerate product line is ideal. Similar to a “distribution booster”, these fabrics combine PCM with an additional heat-spreader technology dissipate excess heat much faster and make the PCM process more active and efficient for more comfort during sleep.

Xelerate products add an extra plus of technology to matresses, toppers, pillows and duvets for those that suffer from hot flushes and night sweat attacks, as they occur e.g. during menopause.

Boosted heat distribution for higher performance

Whether you’re on the slopes, at the gym or out for a hike, individuals like to be comfortable when they are enjoying their favorite activity. Although sweat may be seen as an indication of exertion for some, for most the excess sweat is the leading cause of discomfort, rubbing blisters, wet clothes during cool down phases and also unwanted odors.

Outlast® technology proactively reduces overheating before sweat occurs by absorbing, storing and releasing heat, depending on the environmental conditions. The innovative combination of intelligent Outlast® PCMs and heat spreading technology provides an accelerated level of performance.

Sweat attacks are quickly tackled by distributing heat spots equally and quickly. In addition, the ability of the Outlast® PCMs to go through the melting and crystallization process faster and more often, offers a more active and effective level of heat management - providing the wearer with the ultimate climate comfort.
Address：Songshan Lake, Dongguan,Guangdong,PRC 523808  M/P：13929258165

Mail：ken.wang@kunlun-material.com

Kunlun New Material Technology
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