• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    Use of an organic xerogel as a thermal insulator. The present invention relates to the use as thermal insulator of an organic xerogel, preferably a xerogel of resorcinol/formaldehyde (xerogel rf), of low density and preferably of high porosity. (Machine-translation by Google Translate, not legally binding)
    公开号:ES2637207A1
    申请号:ES201630277
    申请日:2016-03-10
    公开日:2017-10-11
    发明作者:Ana Arenillas De La Puente；José Ángel MENÉNDEZ DÍAZ；Natalia REY RAAP；Esther GÓMEZ CALVO
    申请人:Consejo Superior de Investigaciones Cientificas CSIC；
    IPC主号:
    专利说明:

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    In another embodiment the invention relates to the use defined above, where the organic xerogel is obtained after a post-treatment in air at a temperature of 100 ° C.
    In another embodiment the invention relates to the use defined above, wherein: the organic xerogel results from the polymerization between an aldehyde and a hydroxylated benzene; - where the molar ratio between hydroxylated benzene and aldehyde is between 0.1 and 0.5, and preferably 0.12; and -the organic xerogel is obtained after a post-treatment in air at a temperature between 100 ° C and 300 ° C.
    In another embodiment the invention relates to the use defined above, wherein: the organic xerogel results from the polymerization between an aldehyde and a hydroxylated benzene; The aldehyde is selected from formaldehyde and furfural, and preferably formaldehyde; - the hydroxylated benzene is selected from resorcinol, phenol and catechol, and preferably catechol; - where the molar ratio between hydroxylated benzene and aldehyde is between 0.1 and 0.5, and preferably 0.12; and -the organic xerogel is obtained after a post-treatment in air at a temperature between 100 ° C and 300 ° C
    Throughout the invention, the term "thermal insulator" refers to a material
    25 characterized by its high thermal resistance, in such a way that it prevents or hinders the transfer of heat between two media that are at different temperatures and that naturally tend to match their temperatures. All materials offer a certain resistance to heat transmission, however, in practice, or industrially, those that have a thermal
    30 thermal conductivity less than 0.050 W m-1 K-1.
    The term "organic gel" refers to a solid polymer of organic nature that is obtained by a sol-gel polymerization process of one or more precursors (monomers) of organic nature, and subsequent removal of the solvent in which
    35 polymerization has been carried out.
    8
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    invention is between 0.3 and 4 cm3 g-1, preferably between 2 and 4 cm3 g-1 and more preferably 3 cm3 g-1.
    The term "density" refers to the amount of mass of material in a given volume, expressed in g cm-3. The density of the xerogels of the invention is between 0.2 and 0.6 g cm-3, preferably between 0.2 and 0.4 g cm-3 and more preferably 0.2
    g cm-3.
    The term "catalyst of a basic nature" refers to a substance of nature.
    Organic or inorganic whose pH in aqueous solution is greater than 7. Examples of inorganic catalyst include, among others, Na (OH), Na2CO3, NaHCO3, NH4NO3 and NH4Cl. Examples of a catalyst of an organic nature include, among others, urea, melamine, pyrone, pyridine, methyl amine and dimethyl amine.
    The term "post-treatment in air" refers to a treatment at a temperature above 100 ° C and below 300 ° C, atmospheric pressure and air atmosphere, which is done after the synthesis of the xerogel. This post-treatment can be carried out in a conventional oven or in any other type of device capable of raising the temperature of the material to the temperature of the post-treatment.
    Throughout the description and the claims the word "comprises" and its variants are not intended to exclude other technical characteristics, additives, components or steps. For those skilled in the art, other objects, advantages and features of the invention will be derived partly from the description and partly from the practice and not
    25 is intended to be limiting of the present invention. BRIEF DESCRIPTION OF THE FIGURES
    FIG. 1 Dependence on the thermal conductivity of RF xerogels with the apparent density and pore size. EXAMPLES
    The invention will now be illustrated by tests carried out by the inventors, which demonstrates the effectiveness of the product of the invention.
    10
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    Table 2. Thermal conductivity of synthesized RF xerogels
    Xerogel K (W m-1 K-1)
    TO 0.064 (not insulating)
    B 0.046
    C 0.040
    D 0.039
    AND 0.044
    F 0.040
    G 0.035
    As mentioned earlier, driving is the transmission mechanism and
    The heat that has more weight, and the density (or porosity) of the insulating material directly influences this property. Thus, the xerogel A, which is a poorly porous and dense material, has a thermal conductivity of 0.064 W m-1 K-1, and cannot be considered as an insulator, since those materials that have a conductivity due to below 0.050 W m-1 K-1. If the RF xerogels
    10 have a porosity greater than 70% give rise to materials that fall within the range of insulators. However, the low density of the material is a necessary but not sufficient condition for a material to be a good thermal insulator. Since the xerogels E, F and G have the same density but nevertheless different thermal conductivity,
    15 due to differences in pore size. Thus, for the same density, at a smaller pore size, lower thermal conductivity, because the convection component is minimized, and therefore the material has better properties as a thermal insulator. The results in Table 2 show that the value of K has been reduced by more than 20%, that is, the insulating capacity of the RF xerogel improves
    20 when samples of equal density have narrower pores.
    The dependence of thermal conductivity with density and pore size is shown graphically in Figure 1.
    25 The two main heat transfer mechanisms that contribute to the thermal conductivity of RF xerogels are the conduction and convection inside the pores of the material. The porous properties of these materials, in particular the density and pore size, have the opposite influence on each
    13


    One of these mechanisms. It is necessary, therefore, to achieve a compromise between them in order to minimize the total thermal conductivity. On the one hand, the density influences the conduction mechanism because the higher the density, the less the interconnections between the material and, therefore, the conduction through the solid is minimized. On the other hand, smaller pore sizes prevent collisions between gas molecules and thus heat transmission by thermal convection is reduced. Consequently, by design of the porosity of the RF xerogels, thermal conductivities analogous to one of the most commonly used insulating materials, expanded polystyrene (0.035 W, can be obtained)
    10 m-1 K-1). With the advantage that RF xerogels have better mechanical properties and greater resistance to chemicals than expanded polystyrene, and can be applied in the form of ink or paint. All this leads to a considerable increase in the fields of application of RF xerogels as insulators.
    14
    权利要求:
    Claims (1)
    [1]
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    类似技术:
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    同族专利:
    公开号 | 公开日
    ES2637207B1|2018-07-18|
    WO2017153624A1|2017-09-14|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    DE102008030921A1|2008-07-02|2010-01-07|Bayerisches Zentrum für Angewandte Energieforschung e.V.|Micro- and mesoporous carbon xerogel with characteristic mesopore size and its precursors, and a process for the preparation of these and their use|
    ES2354782B1|2009-06-03|2012-01-31|Consejo Superior De Investigaciones Científicas |PROCEDURE FOR OBTAINING ORGANIC XEROGELS OF CONTROLLED POROSITY.|
    法律状态:
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    优先权:
    申请号 | 申请日 | 专利标题
    ES201630277A|ES2637207B1|2016-03-10|2016-03-10|USE OF AN ORGANIC XEROGEL AS THERMAL INSULATION|ES201630277A| ES2637207B1|2016-03-10|2016-03-10|USE OF AN ORGANIC XEROGEL AS THERMAL INSULATION|
    PCT/ES2017/070133| WO2017153624A1|2016-03-10|2017-03-09|Use of an organic xerogel as heat insulator|
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