WO2017124161A1 - Agente regulador de temperatura nanoencapsulado (artn) - Google Patents
Agente regulador de temperatura nanoencapsulado (artn) Download PDFInfo
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- WO2017124161A1 WO2017124161A1 PCT/BR2016/050008 BR2016050008W WO2017124161A1 WO 2017124161 A1 WO2017124161 A1 WO 2017124161A1 BR 2016050008 W BR2016050008 W BR 2016050008W WO 2017124161 A1 WO2017124161 A1 WO 2017124161A1
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- Prior art keywords
- temperature regulating
- regulating agent
- agent according
- nanoencapsulated
- nanoencapsulated temperature
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Classifications
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K5/00—Heat-transfer, heat-exchange or heat-storage materials, e.g. refrigerants; Materials for the production of heat or cold by chemical reactions other than by combustion
- C09K5/02—Materials undergoing a change of physical state when used
- C09K5/06—Materials undergoing a change of physical state when used the change of state being from liquid to solid or vice versa
- C09K5/063—Materials absorbing or liberating heat during crystallisation; Heat storage materials
Definitions
- the invention pertains to the field of materials for the production of heat or cold by chemical reactions other than combustion, the thermal effect being accompanied by a change from liquid to solid physical state or vice versa containing organic active ingredients. and inorganic compounds that promote temperature regulation using two associated physical principles in the same nanocapsule nanostructure: the phase change by fusion / solidification of an organic material and the reflection of infrared radiation present in white light that focuses on the nanostructure containing the nanostructured temperature regulating agent.
- This nanocapsulated temperature regulating agent has a shell-to-core morphology consisting of a core formed of melting / solidifying organic material and IR radiation filter nanoparticles, which may be incorporated within the nanostructure together with the material.
- This temperature regulating agent can be applied in the generation of products related to the fields of cosmetics, pharmaceuticals, medical equipment, prosthetics, textiles, paints, coatings, composites, packaging, construction, electrical or electronic equipment, automotive and paper.
- the need for human thermal comfort is a condition related to the functioning of your body, which could simply be compared to a machine that has to exchange heat generated by its activity or conserve heat to maintain this. activity.
- the heat exchange between the environment and man is done without the need to trigger mechanisms, such as perspiration or excessive use of protection (warm clothing, for example), the feeling of thermal comfort is generated and the individual has his ability maximum activity or work.
- Thermal comfort is strongly related to temperature, humidity, air velocity and solar incidence, as well as the influence of rainfall, vegetation, soil permeability, surface or groundwater and topography.
- Temperature regulators based on the melt / solidification process, ie based in their latent heat, they can be of the organic or inorganic type, and for organic materials, waxes and paraffins are highlighted, and for inorganic ones, some salts or eutectic mixtures of salts and water are highlighted.
- these temperature regulating materials need to be encapsulated so that during the melting process they do not diffuse into the substrate they are applying or permeate into the skin for cosmetic products and thus maintain. its main characteristic is that it absorbs and releases heat cyclically and with the same thermal efficiency as fusion and solidification enthalpy.
- PCMs Phase Change Materials
- IR radiation a colloidal oxide, which together give the absorption / release of energy aiming to regulate the temperature of a surface and also with the presence of colloidal oxide in the same nanostructure having the function of reflecting infrared radiation enhancing the effect.
- temperature regulation of the product presented by this invention that is, conferring in a same nanostructure temperature control mechanisms for the three main forms of heat exchange: conduction, convection and radiation, thus constituting its novelty and inventive activity.
- the nanoencapsulated temperature regulating agent of the present invention features a nanoencapsulated temperature regulating agent (ARTN) which aggregates, in the same nanostructure, an organic material capable of melting by heat absorption or solidifying by heat release. , and nanoparticles from an IR radiation filter, a colloidal oxide capable of reflecting infrared radiation, which is responsible for heating surfaces exposed to a heat source.
- ARTN nanoencapsulated temperature regulating agent
- the produced ARTN may be in the form of a colloidal dispersion in aqueous medium or in the form of nanoparticle if the aqueous dispersion of the ARTNs is subjected to any drying process, such as spray-drying, fluid bed drying, filtration, lyophilization, centrifugation, among others.
- any drying process such as spray-drying, fluid bed drying, filtration, lyophilization, centrifugation, among others.
- the combination of temperature regulation mechanisms and the fact that ARTN is in the nanometer scale gives it greater efficiency in heat transfer processes and surface covering power, ensuring greater reflection of infrared radiation. Due to its versatility and different forms of presentation, this ARTN allows to obtain different types of products for application in the cosmetics, pharmaceutical, medical equipment, prosthetics, textiles, paints, coatings, composites, packaging, construction, equipment. electrical or electronic, automotive and paper.
- Figure 1 shows an illustrative scheme of the proposed mechanism of action for the nanocapsulated temperature regulating agent, showing the polymeric shell (1), the PCM core with IR radiation filter (2), the polymeric shell with IR radiation (3) and the PCM core (4).
- Figure 2 shows a photograph of a plate containing the product after exposure to a temperature of 40 ° C in an air circulation oven (Example 1).
- Figure 3 shows a photomicrograph of the nanoencapsulated product of Example 1.
- Figure 4 shows the DSC curve of 20 consecutive heating and cooling cycles of the nanocapsulated product of Example 1.
- Figure 5 shows a photograph of a plate containing the product after exposure to a temperature of 40 ° C in an air circulation oven (Example 2).
- Figure 6 shows a photomicrograph of the nanoencapsulated product of Example 2.
- Figure 7 shows the graph of consecutive dynamic turbidimetry (stability) scans of the nanocapsulated product of Example 2.
- Figure 8 shows a photograph of a plate containing the product after reaction, exposed to the temperature of em ° C in an air circulation oven (Example 3).
- Figure 9 shows a photomicrograph of the nanocapsulated product of Example 3.
- Figure 10 shows a photograph of a plate containing the reaction product, exposed to a temperature of 40 ⁇ ° C and an air circulation oven (Example 4).
- Figure 11 shows a photomicrograph of the nanocapsulated product of Example 4.
- Figure 12 shows a photograph of a plate containing the reaction product, exposed to a temperature of 40 ⁇ ° C and an air circulation oven (Example 5).
- Figure 13 shows a photomicrograph of the nanocapsulated product of Example 5.
- Figure 14 shows consecutive dynamic turbidimetry (stability) scans of the nanocapsulated product of Example 5.
- Figure 15 shows a photograph of a plate containing the reaction product, exposed to a temperature of 40 ° C and an air circulation oven (Example 6).
- Figure 16 shows a photomicrograph of the nanocapsulated product of Example 6.
- Figure 17 shows consecutive dynamic turbidimetry scans of the nanocapsulated product of Example 6.
- Figure 18 shows a photograph of a plate containing the reaction product, exposed to a temperature of 40 ° C and an air circulation oven (Example 7).
- Figure 19 shows a photomicrograph of the nanoencapsulated product of Example 7.
- Figure 20 presents DSC curve graph showing 20 consecutive cycles of heating and cooling of the nanocapsulated product of Example 7.
- Figure 21 shows turbidimetry graph of the nanoencapsulated PCM sample from Example 8.
- Figure 22 shows a photograph of a plate containing the product after reaction, exposed to a temperature of 40 ° C in a greenhouse (Example 8).
- Figure 23 shows a photomicrograph obtained by scanning electron microscopy of the thermofunctional nanostructure of Example 8.
- Figure 24 shows the evaluation graph of 20 DSC heating and cooling cycles (Example 8).
- Figure 25 shows turbidimetry graph of the nanoencapsulated PCM sample from Example 9.
- Figure 26 shows a photograph of a plate containing the product after reaction, exposed to a temperature of 40 ° C in a greenhouse (Example 9).
- Figure 27 shows photomicrographs obtained by scanning electron microscopy of the thermofunctional nanostructure of example 9.
- Figure 28 shows the evaluation graph of 20 DSC heating and cooling cycles (Example 9).
- Figure 29 shows the graph of infrared radiation reflection by courier transform infrared spectroscopy (FTIR) technique of the samples of Examples 1 and 2.
- FTIR courier transform infrared spectroscopy
- Figure 30 shows photograph of the suspension of the 5 ppm diluted thermofunctional nanostructure synthesized without zinc oxide (A) compared to the same zinc oxide infrared radiation filter thermofunctional nanostructure (B) of Example 10.
- Figure 31 shows the graph of infrared radiation reflection by the courier transform infrared spectroscopy (FTIR) technique of the samples of Examples 8 and 9.
- FTIR courier transform infrared spectroscopy
- the nanocapsulated temperature regulating agent of the present invention is an approach for the generation of thermal regulation systems without the use of electricity, that is, using heat exchange material melting / solidification mechanisms and also the use of materials that promote reflection of infrared radiation, responsible for heating or cooling objects, surfaces or bodies.
- This nanoencapsulated temperature regulating agent has a nanocapsule-like morphology consisting of a core formed of melt / solidification organic material and the IR radiation filter nanoparticles may be incorporated within the nanostructure together with the organic material or surface of the nanostructure constituting part of the shell, depending on this morphology of the synthesis method employed
- the organic material responsible for the melt / solidification heat absorption or release process may be wax, butter, paraffin, salt or soluble polymer or blends of these materials having a melting / solidification point in the range of 10 to 120 ° C. , preferably preferably between 29 to 32 ° C.
- the colloidal oxide to be used should have an average particle size of less than 200 nm, preferably less than 50 nm.
- the IR radiation filter may be a colloidal oxide based on titanium, silica or zinc, preferably zinc.
- Nanocapsules are formed in situ during the nanocapsulation process using preformed polymers, functional ethylene monomers or bifunctional monomers that polymerize by polycondensation or polyaddition mechanisms.
- the monomer to be used in peel formation and ARTN generation should be cyanoacrylate, preferably butylcyanoacrylate type.
- the mass ratio of organic material / colloidal oxide nanoparticle / monomer may range from 47: 35: 16 to 92: 0.01: 7.99, preferably 73: 15: 12.
- the content of active material (organic material) present in the organic phase it may range from 5 to 35% preferably 28% by mass.
- the nonionic emulsifier and protective colloid used in the synthesis of the product may be poly (ethylene oxide) derivatives.
- the obtained product may be dried if the aqueous dispersion of the NRNAs is subjected to any drying process such as spray-drying, fluid bed drying, filtration, lyophilization, centrifugation, among others.
- the product generated in this invention has the following characteristics: average particle size ranging from 50 to 3,000 nm, preferably from 150 to 300 nm, pH range from 2.0 to 10.0 preferably 4.2; solids content 5.0 to 50.0%, preferably 34%, spherical morphology and, when dry, it is powdery, partially agglomerated or in the form of dispersed particles and easily redispersed in aqueous medium.
- EXAMPLE 1 Nanocapsulated Temperature Regulating Agent containing 86% / 14% mass ratio of organic material / monomer
- the aqueous phase used in the pre-emulsification (FA-1) was prepared with 12.65 g of distilled water, 1.25 g of sodium lauryl ether sulfate (LESS) and 1.3 g of ethyl acetate; and the second aqueous phase to be used for diluting the preemulsion (FA-2) was only 41.5 g distilled water.
- the obtained nanoencapsulated product was subjected to particle size characterization by dynamic light scattering technique, pH by potentiometry, scanning electron microscopy morphology, total solids content by thermogravimetry technique and thermal analysis by technique. differential scanning calorimetry (DSC).
- Table 1 presents the results of average particle size, pH, total solids content. As can be seen, the solids content was about 27.63% by mass, mean particle size 261.3 nm and pH 6.69.
- Figure 2 shows a photograph of a plate containing the product after reaction exposed to a temperature of 40 DEG C. and in an air circulation oven. As can be seen, the appearance of the sample is "dry", that is, without the presence of molten organic material, which melts at 32 ° C, indicating that it was nanoscoped by the interfacial polymerization process.
- Figure 3 shows a photomicrograph of the nanocapsules and, as can be seen, the particle size was in nanometer order.
- Figure 4 shows the DSC curve for the nanocapsulated sample, showing consecutive heating and cooling cycles and showing that the melt enthalpy of the material does not change significantly, proving that the nanocapsules show a cyclic absorption effect. power.
- EXAMPLE 2 Nanocapsulated Temperature Regulating Agent containing 73% / 12% / 15% by weight ratio of organic material / monomer / colloidal oxide
- the obtained nanoencapsulated product was subjected to particle size characterization by dynamic light scattering technique, pH by potentiometry, scanning electron microscopy morphology, colloidal physical stability by dynamic scanning turbidimetry technique. and the total solids content by the thermogravimetric technique.
- Table 2 presents the results of average particle size, pH, total solids content. As can be seen, the solids content was of the order of 33.8% by mass and the average particle size of 253.8 nm and pH of 8.2.
- Figure 5 shows a photograph of a plate containing the reaction produtoapós exposed to a temperature of 40 ⁇ C in an air circulating oven. As can be seen, the appearance of the sample is "dry", that is, without the presence of molten organic material, which melts at 32 ° C, indicating that it was nanocapsulated by the interfacial polymerization process.
- Figure 6 shows a photomicrograph of the nanoencapsulated product and, as can be seen, the particle size was in nanometer order.
- Figure 7 shows a dynamic turbidimetry image of the sample, analyzed for a period of 24 consecutive hours after sample preparation, scanning the entire height of the sample holder every 1 hour. As can be observed, a behavior of colloidal physical stability over time is evidenced, with no difference in light backscattering of the sample for the evaluated times.
- EXAMPLE 3 Nanocapsulated Temperature Regulating Agent containing 57% / 19% / 24% by weight ratio of organic material / monomer / colloidal oxide
- the obtained nanoencapsulated product was subjected to particle size characterization by dynamic light scattering technique, pH by potentiometry, morphology by scanning electron microscopy technique, and total solids content by thermogravimetry technique.
- Table 3 presents the results of average particle size, pH, total solids content. As can be seen, the solids content was of the order of 33.8% by mass and the average particle size of 281.0 nm and pH 8.3.
- Figure 8 shows a photograph of a plate containing the product after reaction, exposed to the temperature of an air circulation oven. As can be seen, the appearance of the sample is "dry", that is, without the presence of molten organic material, which melts at 32 ° C, indicating that it was nanocapsulated by the interfacial polymerization process.
- Figure 9 shows a photomicrograph of the nanocapsules and, as can be seen, the particle size was in the nanometer order.
- EXAMPLE 4 Nanocapsulated Temperature Regulating Agent containing 80% / 9% / 11 1% by weight ratio of organic material / monomer / colloidal oxide
- the obtained nanoencapsulated product was subjected to particle size characterization by dynamic light scattering technique, pH by potentiometry, morphology by scanning electron microscopy technique, and total solids content by thermogravimetry technique.
- Table 4 presents the results of average particle size, pH, total solids content. As can be seen, the solids content was on the order of 36.4 mass% and the average particle size 244.3 nm and pH 8.3.
- Figure 10 shows a photograph of a plate containing the product after reaction, exposed at 40 ° C in an air circulation oven. As can be seen, the appearance of the sample is "dry", ie without the presence of molten organic material which melts in the 32 ° C, indicating that it was nano encapsulated by the interfacial polymerization process.
- Figure 11 shows a photomicrograph of the nanocapsules and, as can be seen, the particle size was in nanometer order.
- EXAMPLE 5 Nanocapsulated Temperature Regulating Agent containing 52% / 30% / 18% mass ratio of organic material / monomer / colloidal oxide
- the obtained nanoencapsulated product was subjected to particle size characterization by dynamic light scattering technique, pH by potentiometry, scanning electron microscopy morphology, colloidal physical stability by dynamic scanning turbidimetry technique and the content of total solids by thermogravimetry technique.
- Table 5 presents the results of average particle size, pH, total solids content. As can be seen, the solids content was on the order of 29.36 mass%, the average particle size 226.8 nm and pH 8.3.
- Figure 12 shows a photograph of a plate containing the product after reaction, exposed at 40 ° C in an air circulation oven. As can be seen, the appearance of the sample is "dry", that is, without the presence of molten organic material, which melts at 32 ° C, proving that it was nanoen capsulated by the interfacial polymerization process.
- Figure 13 shows a photomicrograph of the nanocapsules and, as can be seen, the particle size was in the nanometer order.
- Figure 14 shows a dynamic turbidimetry image of the sample, analyzed for a period of 17 consecutive hours after preparation, performing full-length sweeps every 1 hour. As can be observed, a behavior of colloidal physical stability over time is evidenced, with no difference in the backlight scattering of the sample for the evaluated times.
- EXAMPLE 6 Nanocapsulated Temperature Regulating Agent containing 48% / 36% / 16% by weight ratio of organic material / monomer / colloidal oxide
- the obtained nanoencapsulated product was subjected to particle size characterization by dynamic light scattering technique, pH by potentiometry, scanning electron microscopy morphology, colloidal physical stability by dynamic scanning turbidimetry technique. and the total solids content by the thermogravimetric technique.
- Table 6 presents the results of average particle size, pH, total solids content. As can be seen, the solids content was of the order of 31, 21% by mass, the average particle size of 266.0 nm and pH of 8.21.
- Figure 15 shows a photograph of a plate containing the product after reaction, exposed at 40 ° C in an air circulation oven. As can be seen, the appearance of the sample is "dry", that is, without the presence of molten organic material, which melts at 32 ° C, proving that it was nanoen capsulated by the interfacial polymerization process.
- Figure 16 shows a photomicrograph of the nanocapsules and, as can be seen, the particle size was in the nanometer order.
- Figure 17 shows a dynamic turbidimetry image of the sample, analyzed for a period of 24 consecutive hours after sample preparation, scanning the entire height of the sample holder every 1 hour. As can be observed, a behavior of colloidal physical stability over time is evidenced, with no difference in light backscattering of the sample for the evaluated times.
- EXAMPLE 7 Nanocapsulated Temperature Regulating Agent containing 48% / 36% / 16% by weight ratio of organic material / monomer / colloidal oxide
- the obtained nanoencapsulated product was subjected to particle size characterization by the dynamic light scattering technique, pH by potentiometry, scanning electron microscopy morphology, colloidal physical stability by the dynamic scanning turbidimetry technique and the total solids content by thermogravimetry technique.
- Table 7 presents the results of average particle size, pH, total solids content. As can be seen, the solids content was on the order of 31.89 mass%, the average particle size 226.6 nm and pH 7.9.
- Figure 18 shows a photograph of a plate containing the product after reaction, exposed at 40 ° C in an air circulation oven. As can be seen, the appearance of the sample is "dry", that is, without the presence of molten organic material, which melts at 32 ° C, indicating that it was nanoscoped by the interfacial polymerization process.
- Figure 19 shows a photomicrograph of the nanocapsules and, as can be seen, the particle size was in nanometer order.
- Figure 20 shows the DSC curve for the nanocapsulated sample showing 20 consecutive heating and cooling cycles, showing that the melt enthalpy of the material does not change significantly, and the nanocapsules show a cyclic absorption effect. power.
- Example 8 Thermofunctional nanostructure containing 64% / 29% / 7% mass ratio of organic material / colloidal oxide / monomer In a jacketed and bottom outlet glass reactor maintained at 70 ° C, 18,300 g of 30% colloidal silicon dioxide in water (w / w), 132.70 g of distilled water, 5.50 g of 50% colloidal zinc oxide dispersion in water (w / w) were added.
- the obtained nanoencapsulated product was subjected to particle size and zeta potential characterizations by dynamic light scattering technique, morphology by scanning electron microscopy technique, colloidal physical stability by dynamic scanning turbidimetry technique, total solids by thermogravimetry technique, aspect evaluation after oven drying, pH, quantification of residual monomer content in the final formulation, differential exploratory calorimetry (DSC) thermal profile.
- DSC differential exploratory calorimetry
- Table 8 presents the results of average particle size, pH, total solids content. As can be seen, the solids content was of the order of 12.67% by mass and the average particle size of 332.6 nm, being the polydispersity index of 0.271. Monomer residuals are less than 0.01% for methyl methacrylate and less than 0.05% for hydroxyethyl methacrylate.
- Figure 21 shows the turbidimetry curves as a function of the sample position in the sample holder, noting that the smaller the separation between the curves over the analysis time, which in this case was 24 hours, the larger the colloidal physical stability of nanocapsules in the aqueous medium.
- the product showed high physical stability within the analyzed time period.
- Figure 22 shows a photograph of a plate containing the product after reaction, exposed to a temperature of 40 ° C in an air circulation oven and Figure 23 shows a scanning electron microscopy photomicrograph of the thermofunctional nanostructure of Example 8.
- the appearance of the sample is "dry", ie without the presence of molten organic material which melts at 32 ° C, indicating that it has been nanocapsulated and, as can also be observed. , the particle size was in nanometer order.
- Table 8-A presents the thermal profile evaluation results covering the melting onset temperature, the melting peak temperature and the melting end temperature, as well as the enthalpy normalized by the evaluated nanoencapsulated PCM mass. The values shown refer to the 3 cycles of thermal analysis.
- the encapsulation efficiency value was calculated from the normalized fusion enthalpy ratio of the first heating cycle of the PCM thermofunctional nanostructure and the standard fusion enthalpy. of pure PCM.
- the encapsulation efficiency was 87.96%, with reference to pure PCM enthalpy the value of 16.07 J / g.
- Figure 24 presents an evaluation of 20 DSC heating and cooling cycles to demonstrate the maintenance of the thermal property of the thermofunctional nanostructure, showing the cyclical effect of PCM when subjected to external temperature variations (obs. .: It should be noted that the first heating curve has a slightly different profile from the others because the solidification of the nanocapped was not performed in a standardized way, ie not in equipment, but at room temperature).
- Example 9 Thermofunctional nanostructure containing 70% / 21% / 9% (w / w) ratio organic material / colloidal oxide / monomer
- the obtained nanoemulsion was transferred to a jacketed glass reactor and bottom outlet under nitrogen inert atmosphere at a temperature 70 ° C and moderate agitation (between 300 and 400 rpm). Over the nanoemulsion 0.214 g of sodium persulphate PA was added. After 2 hours an additional 0.121 g of sodium persulphate PA was added and after a further 1 hour 0.10 g of sodium persulphate PA was added after 4 hours. After the polymerization process, the sample was transferred to a glass vial, immersed in an ice bath, where it was kept under stirring for 30 min with the aid of a mechanical stirrer.
- the obtained nanoencapsulated product was subjected to particle size and zeta potential characterization by dynamic light scattering technique, morphology by scanning electron microscopy technique, colloidal physical stability by dynamic scanning turbidimetry technique, total solids content. by thermogravimetry technique, appearance evaluation after oven drying, pH, quantification of residual monomer content in the final formulation, differential exploratory calorimetry thermal profile (DSC).
- DSC differential exploratory calorimetry thermal profile
- Table 9 presents the results of average particle size, pH, total solids content and residual monomers.
- the solids content was of the order of 12.69% by mass and the average particle size of 337.1 nm, being the polydispersity index of 0.379.
- Monomer residuals are less than 0.01% for methyl methacrylate and less than 0.05% for hydroxyethyl methacrylate.
- Figure 25 shows the turbidimetry curves as a function of the sample position in the sample holder, noting that the smaller the separation between the curves over the analysis time, which in this case was 24 hours, the greater the colloidal physical stability of nanoencapsulates in the aqueous medium.
- the product showed high physical stability within the analyzed time period.
- Figure 26 shows a photograph of a plaque containing the product after reaction, exposed to a temperature of 40 ⁇ C in an air circulating oven. As can be seen, the appearance of the sample is "dry", that is, without the presence of molten organic material which melts at 32 ° C, indicating that it has been nano encapsulated by the emulsion polymerization process.
- Figure 27 shows a scanning electron microscopy photomicrograph of the thermofunctional nanostructure of Example 9 and, as can be seen, the particle size was in the nanometric order.
- Table 10 presents the thermal profile assessment results covering the melting onset temperature, the melting peak temperature and the melting end temperature, as well as the enthalpy normalized by the evaluated nanoencapsulated PCM mass. The values shown refer to the 3 cycles of thermal analysis.
- Table 10 Thermal profile evaluation results covering melting onset temperature, peak melting temperature and melting end temperature and standard enthalpy.
- the encapsulation efficiency value was calculated from the normalized fusion enthalpy ratio of the first heating cycle of the PCM thermofunctional nanostructure and the pure fusion enthalpy of pure PCM. .
- the encapsulation efficiency was 100.07% with reference to pure PCM enthalpy the value of 16.07 J / g.
- Figure 28 presents an evaluation of 20 DSC heating and cooling cycles to demonstrate the maintenance of the thermal property of the thermofunctional nanostructure, showing the cyclic effect of PCM when subjected to temperature variations of the external medium. no (note: it should be noted that the first heating curve has a slightly different profile from the others because the solidification of the nanocapsule was not performed in a standardized way, ie not at equipment, but at room temperature) .
- EXAMPLE 10 Evaluation of the effectiveness of ARTN in blocking infrared radiation.
- Figure 29 shows an overlap of the infrared spectra obtained in transmittance mode through the films of the evaluated materials.
- ARTN blocked virtually all infrared radiation while conventional PCM blocked only 50% of the radiation.
- This result demonstrates the ability of ARTN to block infrared radiation and thereby modify the heating profile of any surface to which it is applied. Recalling that this block is proportional to the concentration of ARTN in the dispersion used for film formation in the zinc selenide plate.
- Example 1 Comparison of Infrared Radiation Reflectance Properties of Thermofunctional Nanostructure
- Figure 30 shows a photograph of the suspension of the 5 ppm diluted thermofunctional nanostructure synthesized without zinc oxide (A) compared to the same thermofunctional nanostructure with zinc oxide infrared radiation filter (B).
- the opacity effect of the suspension is observed even in very dilute suspensions. This visual effect is confirmed by the analysis of infrared radiation reflection by the courier transform infrared spectroscopy (FTIR) technique.
- Figure 31 shows the comparative FTIR curves of the thermofunctional nanostructure formulations containing zinc oxide infrared radiation filter (Example 8) and non-filter formulation (Example 9), dried over the ZnSe crystal in a greenhouse. 40 ° C.
- Example 8 containing zinc oxide, presented lower transmittance (10%) than the sample without oxide (20%), indicating that the zinc oxide present in the sample blocks the infrared radiation passage. product after film formation, proving the technical effect of the functional nanostructure.
- EXAMPLE 12 Evaluation of the efficiency of ARTN in temperature regulation.
- the aluminum surface containing the samples was subjected to a controlled temperature programming as shown in Figure 33 and using the thermography technique IV the thermal mapping of the aluminum surface containing the formulations was performed, considering the registration. of temperatures as a function of time.
- the comparative analysis of the formulations analyzed was by calculating the rate of temperature variation experienced by the sample as a function of time (temperature) normalized by the total mass of (value expressed in ° C / min g), as shown below:
- Figure 33 illustrates the results obtained by highlighting the action effect related to the ARTN, which is expressed through a reduction in the rate of change in temperature experienced by the sample during the cycle, which can be translated into practical terms. application as a greater perceived thermal comfort.
- the set was subjected to a controlled temperature programming using the thermography technique IV, having been made the thermal mapping of the device considering the recording of temperatures as a function of time.
- the comparative analysis of the formulations analyzed was by calculating the temperature variation rate experienced by the sample as a function of time normalized by the total mass of wax present in the different samples (value expressed in ° C / min g), according to the equation. presented below:
- PCM total mass of blush
- Figures 34 and 35 illustrate the effect of the presence of zinc oxide (ZnO) on the composition that appears as positive, thus proving greater thermal comfort, which can be assessed by reducing the rate of change in temperature. experienced by the sample.
- ZnO zinc oxide
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Abstract
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Priority Applications (5)
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US16/072,067 US20190031935A1 (en) | 2016-01-22 | 2016-01-22 | Nanoencapsulated temperature regulating agent |
EP16718597.4A EP3406689A1 (en) | 2016-01-22 | 2016-01-22 | Nanoencapsulated temperature regulating agent (ntra) |
PCT/BR2016/050008 WO2017124161A1 (pt) | 2016-01-22 | 2016-01-22 | Agente regulador de temperatura nanoencapsulado (artn) |
AU2016388366A AU2016388366A1 (en) | 2016-01-22 | 2016-01-22 | Nanoencapsulated temperature regulating agent (ntra) |
CL2018001994A CL2018001994A1 (es) | 2016-01-22 | 2018-07-23 | Agente regulador de la temperatura nanoencapsulado (ntra). |
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PCT/BR2016/050008 WO2017124161A1 (pt) | 2016-01-22 | 2016-01-22 | Agente regulador de temperatura nanoencapsulado (artn) |
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EP (1) | EP3406689A1 (pt) |
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US20070031652A1 (en) * | 2005-08-05 | 2007-02-08 | Bellemare James V | Thermally reflective encapsulated phase change pigment |
US20120149265A1 (en) * | 2009-07-01 | 2012-06-14 | Basf Se | Particulate composition |
US20150291868A1 (en) * | 2012-11-09 | 2015-10-15 | Bioastra Technologies Inc. | Nanostructured phase change materials for solid state thermal management |
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US6977278B1 (en) * | 2001-01-08 | 2005-12-20 | Loctite (R&D) Ltd. | Cyanoacrylate compositions curable to flexible polymeric materials |
DE10163162A1 (de) * | 2001-12-20 | 2003-07-03 | Basf Ag | Mikrokapseln |
EP2295044A1 (de) * | 2009-09-15 | 2011-03-16 | Bayer Technology Services GmbH | Verkapselung unter Verwendung von wachsartigen Substanzen |
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2016
- 2016-01-22 EP EP16718597.4A patent/EP3406689A1/en not_active Withdrawn
- 2016-01-22 AU AU2016388366A patent/AU2016388366A1/en not_active Abandoned
- 2016-01-22 WO PCT/BR2016/050008 patent/WO2017124161A1/pt active Application Filing
- 2016-01-22 US US16/072,067 patent/US20190031935A1/en not_active Abandoned
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Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
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US20070031652A1 (en) * | 2005-08-05 | 2007-02-08 | Bellemare James V | Thermally reflective encapsulated phase change pigment |
US20120149265A1 (en) * | 2009-07-01 | 2012-06-14 | Basf Se | Particulate composition |
US20150291868A1 (en) * | 2012-11-09 | 2015-10-15 | Bioastra Technologies Inc. | Nanostructured phase change materials for solid state thermal management |
Non-Patent Citations (1)
Title |
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MENNIG M ET AL: "Multilayer NIR reflective coatings on transparent plastic substrates from photopolymerizable nanoparticulate sols", THIN SOLID FILMS, ELSEVIER-SEQUOIA S.A. LAUSANNE, CH, vol. 351, no. 1-2, 30 August 1999 (1999-08-30), pages 225 - 229, XP004183099, ISSN: 0040-6090, DOI: 10.1016/S0040-6090(99)00340-5 * |
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US20190031935A1 (en) | 2019-01-31 |
CL2018001994A1 (es) | 2019-08-09 |
EP3406689A1 (en) | 2018-11-28 |
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