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Moulded bodies, in particular fibres and the structures thereof exhibiting thermoregulation properties

a technology of thermoregulation properties and moulding bodies, which is applied in the direction of monocomponent protein artificial filaments, melt spinning methods, conjugated cellulose/protein artificial filaments, etc., can solve the problems of limited temperature regulation material in the entire fiber, low amount of temperature regulation material that can be inserted into the fiber, and comparatively low amount of phase change material that can be fixed to the surface of the structure. , to achieve the effect of enhancing the thermoregulation potential

Inactive Publication Date: 2006-12-14
THURINGISCHES INSTITUT FUR TEXTIL & KUNST FORSCHUNG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0013] The object of the invention is to provide a method for producing thermo regulating molded bodies, in particular fibers and nonwoven textile fabrics thereof from native network forming polymers having phase change material included in the network which in contrast to PCM-fibers produced on a synthetic basis have an increased portion of incorporated phase change materials and thus, in avoiding the mentioned disadvantages of the prior art, exhibit an enhanced thermo regulation potential.

Problems solved by technology

A disadvantage thereby is the low amount of temperature regulating materials that can be inserted into the fibers.
Its is disadvantageous with these fibers and the textile fabrics manufactured from said fibers that, due to the described arrangement of the individual components, only a part of the fibers formed from said components contains phase change material, and the part of the temperature regulation material in the entire fiber is, naturally, limited.
Such a method, however, involves the disadvantage that only a comparatively low amount of phase change material can be fixed to the surface of the structures, in particular when only a part of the surface is printed with a suspension of micro-encapsulated phase change material and, hence, the temperature regulation effect, related to the amount of material, is comparatively locally limited.
Additionally, the printing of the textile surface with a suspension of micro-encapsulated phase change material applied in a comparatively thick layer has a disadvantageous effect on the flexibility of the textile products manufactured therefrom and, hence, on the wearability.
Furthermore, the suspensions of micro-encapsulated phase change materials applied to textile surfaces are only restrictedly mechanically stable and fast to washing.
Such a layer setup has the disadvantage that the exchange of heat through the external layers is obstructed and so the heat capacity of the enclosed micro-encapsulated phase change material can only be utilized to a limited degree.
Due to the lack of bonding the micro-encapsulated phase change material to the material of the base structure, both, the amount of introducible phase change material and the capability of an effective heat transfer to the phase change material are limited.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0023] 15779 g of a 60%-solution of n-methylmorpholin-n-oxide are given into a dissolving vessel with agitator of 37 l volume together with 1160 g cellulose of an average polymerisation degree 500 and 464 g (=40% related to the employed amount of cellulose) micro-encapsulated phase change material of a phase change temperature of 28° C. (Thermasorb® TY 83 of Frisby Technologies Inc.) under addition of 6.8 g propylgallate. The micro-encapsulated phase change material has been screened before to a grain size of maximally 50 μm. The dissolving vessel will be evacuated to 20 mbar and is heated from 20° C. to 94° C. in the course of 6 hours at a stirrer RPM of 18 min−1 und the evaporating water is condensed in a connected condenser. The spinning solution obtained exhibits a viscosity of 1560 PAS and a refractive index of 1.484. At a spinning pump RPM of 25 min−1 the spinning solution is at 80° C. extruded through a spinneret having a number of nozzles of 150 and a nozzle diameter of 200 ...

example 2

[0025] 100 g casein are dispersed in 250 ml water and crosslinked by addition of 2 g glutaraldehyde and 0.1 g MgCl2 at 25° C. After squeezing out to a moisture content of 50%, the casein is suspended in 430 g of 60%-NMMNO. 0.5 g propylgallate are added as a stabilizer. 100 g of a micro-encapsulated phase change material such as, for example, Lurapret® TX PMC 28 from BASF AG are added to the suspension what corresponds to an amount of 100 weightpercent of phase change material related to the protein in the solution. The suspension is transferred into a spinning solution in a kneading machine with a jacket heating under a vacuum of 30 mbar and at a temperature of 90° C. by distilling off of 130 g water. The homogeneity of the spinning solution is checked with an optical microscope and turns out, as a rule, 15 minutes after the end of the distillation. The spinning solution is extruded at a spinning temperature of 80° C. in filaments through a spinneret having 150 nozzles each of a dia...

example 3

[0026] 50 g casein are dispersed in 250 ml water and crosslinked by addition of 1 g glutaraldehyde and 0.1 g MgCl2 at 25° C. After squeezing out to a moisture content of 50%, the casein is suspended in 430 g of 60%-NMMNO. Additionally 25 g of dry ground sulphite cellulose (DP 760) as well as 100 g of a micro-encapsulated phase change material such as, for example, Lurapret® TX PMC 28 from BASF AG are added. This corresponds to an amount of 133% PCM related to cellulose. 0.5 g propylgallate are added as a stabilizer. This suspension is transferred into a spinning solution in a kneading machine with a jacket heating under a vacuum of 30 mbar and at a temperature of 90° C. by distilling off of 140 g water. The homogenisation of the spinning solution is achieved 15 minutes after the end of the distillation and is checked with an optical microscope. The resulting spinning solution is extruded through a spinneret having 150 nozzles each of a diameter of 90 μm via an air slot into an aqueo...

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Abstract

The invention related to a method for producing molded bodies made of cross-linked native polymers in such a way that a network is formed by chemically coupled functional groups, hydrogen bridges or polymer or oligomer structures helically connected to each other and up to 200 mass % of micro-encapsulated phase change material is included into a polymer matrix with respect to the cross-linked polymer. Said cross-linked polymers can, for example be embodied in the form of polysaccharides and / or globular proteins. In the form of fibers the molded bodies can be processed to textile fabrics having enhanced thermoregulation properties and an improved wearability to the textiles produced therefrom, as well as a high functionality with respect to heat storage and heat removal when used in other applications.

Description

[0001] Object of the invention is a method of producing molded bodies consisting of native polymers forming networks and phase change materials included therein, which in the form of fibers can be processed to textile fabrics having enhanced thermoregulation properties and which convey an improved wearability to the textiles produced therefrom, as well as a high functionality with respect to heat storage and heat removal when used in other applications. PRIOR ART [0002] Thermoregulation properties of polymer fibers are generated in that phase change materials are applied on to or inserted into a polymer matrix. When changing their phasing or their conformation, phase change materials can absorb and emit, respectively, large amounts of heat at constant temperatures. At the moment of a phase change or a change of conformation an increased heat capacity can be noticed which finds its physical measurable expression in the occurring melting enthalpy and permits the storage or delivery of...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): D01D5/08D01F1/10D01F2/00D01F4/00D01F4/04D01F4/06D01F8/02
CPCD01F1/10D01F4/04D01F4/00D01F2/00
Inventor GERSCHING, DETLEFMEISTER, FRANK
Owner THURINGISCHES INSTITUT FUR TEXTIL & KUNST FORSCHUNG
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