KR101634607B1 - Heat-shielding block and heat-shielding cement composition - Google Patents

Abstract

The heat-shrinkable block of the present invention is a heat-resistant block containing a white cement and a heat-resistant pigment, or a heat-resistant block containing a white cement, a heat-sensitive pigment and a bark material, having a lightness (L value) of 30 to 60 and a solar radiation reflectance of not less than 40% to be. The heat-shrinkable cement composition of the present invention is a cement composition containing a white cement and a heat-shading pigment, or a cement composition containing white cement, a heat-sensitive pigment and a whitening material, wherein the cement composition has a lightness (L value) 60 and the solar radiation reflectance is 40% or more. It has a high heat-insulating performance without increasing the appearance, that is, without increasing the brightness, and can be suitably used particularly in a packaging block.

Description

[0001] HEAT-SHIELDING BLOCK AND HEAT-SHIELDING CEMENT COMPOSITION [0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat-insulating block and a heat-insulating cement composition, and more particularly to a heat-insulating block and a heat-insulating cement composition which can be preferably used as a packaging block.

Pavement blocks attached to road surfaces such as sidewalks and bicycle roads are generally formed into a plate shape using aggregate, cement and pigment as materials. In such a paving block, in particular, to prevent heat island phenomenon caused by a rise in the summer temperature, a heat shielding material or a repair material is added to the block or a block coating material is applied on the block, or a coarse aggregate or a porous aggregate is used, A lot of studies have been made on the heat-insulating block with the given heat capacity.

For example, Japanese Unexamined Patent Publication (Kokai) No. 7-10627 discloses that a mixture of 30 to 60% of white cement, 3 to 10% of titanium oxide, 10 to 20% of silica balloon, 1 to 5% of mica, And a mixture of 30 to 60% of white cement, 3 to 10% of titanium oxide, 1 to 5% of mica, 5 to 30% of glass pieces, 0.5 to 2% of ultraviolet screening agent, 0.1 to 2% of pigment, 30%, etc., were added to each of the bases prepared by appropriately adding 1% or less of thickener to each of the basins, and mixed with an admixture and clear water to provide a cement composite heat reflecting coating have.

However, as described in the above publication, the paint is mainly used for a roof, a roof, a ship deck or the like of a general dried product, and a lot of white cement, titanium oxide or the like having a white appearance is blended. When this paint is used as a coating material for a paving block, the outer appearance of the pavement becomes white, so that the passenger feels a dazzling feeling, or it becomes difficult to distinguish them from the white parting line. It is considered to be suitable for ship decks and the like but not for packing blocks. That is, in the packaging block, it is necessary to provide the heat shielding performance without causing the appearance of the packaging block to be white.

SUMMARY OF THE INVENTION The present invention has been made in view of such a situation, and it is an object of the present invention to provide a liquid crystal display device which is capable of displaying without any appearance of whiteness, that is, without increasing brightness (L * value measured by a brightness measurement test described later, It is an object of the present invention to provide a heat-insulating block and a heat-shrinkable cement composition having a high heat-shrinkable performance, and which can be suitably used particularly in a packaging block.

In order to solve the above problems, the present inventors have made intensive studies, and as a result, it has been found that the heat-generating performance can be provided by increasing the reflectance at a solar radiation reflectance in a block, in particular a reflectance at a near infrared wavelength (wavelength: 780 to 2500 nm) It is considered that the use of a heat-sensitive coloring material for enhancing the reflectance and the use of a dark-coloring heat-sensitive coloring material having a grayish or blackish color in order to increase the reflectance of the solar radiation without increasing the brightness (L value) When the heat-shining pigment is mixed with ordinary Portland cement as a cement composition, the solar radiation reflectivity of the heat-releasing pigment is not expressed in the block, so that the solar radiation reflectance of the block is not so high. On the other hand, Quot; white cement "), the solar radiation reflectance of the heat pigment is expressed in the block, A block having a reflectance can be obtained and thereby a high heat-shielding performance can be provided. Further, when the white aggregate is added to the white cement, a higher solar radiation reflectance is obtained than in the case of the white cement alone, (L value) is 30 to 60, no problem is caused in distinguishing from the glare and the white partition line. Further, when the solar radiation reflectance is set to 40% or more, the effective heat-shielding performance The present invention has been completed.

That is, the heat-shrinkable block according to the present invention is characterized in that the heat-shrinkable block contains white cement and a heat-shining pigment, has a lightness (L value) of 30 to 60 and a solar radiation reflectance of 40% or more.

According to the heat-shrinkable block of the present invention, since the white cement and the heat-sensitive pigment are contained, the solar radiation reflectance of the heat-sensitive pigment is effectively exhibited in the block, and the lightness (L value) is 30 to 60, . Therefore, when the heat shrinkable block is installed on the sidewalk, the lightness is relatively low, so that the passenger does not feel dazzling and is easily distinguished from the white partition line, and a remarkable temperature suppressing effect can be expected.

In the present invention, the reason why the solar radiation reflectance of the heat-releasing pigment is effectively expressed in the block by including the heat-releasing pigment and the white cement is not clear, but since the white cement is very white, the reflectance of the heat- Block and the white cement is a cement which is higher in whiteness than usual portland cement by removing iron powder such as ferric oxide contained in portland cement. This iron powder affects the solar radiation reflectance In the case of ordinary Portland cement containing a lot of iron, it is considered that the reflectance of the heat-radiating pigments is impaired and the reflectance of the white cement is not impaired when iron is removed. Consequently, even if the brightness (L value) of the block itself is lowered, The solar radiation reflectance is damaged by white cement It is expressed in a block without.

It is preferable that the heat-shrinkable block according to the present invention further comprises a backing aggregate in the above-mentioned constitution.

According to this configuration, the following operational effects can be further added in addition to the operational effects. That is, in general, silica sand or the like is used as an aggregate, but in this structure, the silica sand is replaced with a silica sand, or a part of silica sand or the like is replaced with a backing aggregate. Although the reason for this is unclear, it is believed that the whiteness aggregate added to the white cement with the solar radiation reflectivity of the heat-sensitive pigments damaged by silica sand does not impair the solar radiation reflectivity of the heat- (L value), the high solar reflectance of the heat pigment is expressed in the block without being damaged by the white cement and the white aggregate added thereto.

In the heat-shrinkable block according to the present invention, the heat-sensitive pigment preferably has a lightness (L value) of 50 or less and a solar radiation reflectance of 40% or more.

As described above, when the light-sensitive coloring material has a lightness (L value) of 50 or less and a solar radiation reflectance of 40% or more, the lightness (L value) of the block itself is 30 to 60 and the solar radiation reflectance is 40% It becomes easy.

Further, in the heat-shading block containing the white aggregate according to the present invention, the above-mentioned whitening material is preferably limestone (calcium carbonate). In the case of this configuration, since the hardness of limestone (calcium carbonate) is comparatively low, abrasion and scratches do not easily occur on the contact surface with a manufacturing facility such as a kneader, and the grain size is easily displayed.

Further, the heat-shrinkable cement composition according to the present invention is a cement composition containing white cement and heat-shading pigment, wherein the cement composition has a lightness (L value) of 30 to 60 and a solar radiation reflectance of 40% It is featured.

It is preferable that the heat-insulating cement composition of this constitution further comprises a backing aggregate in the above-mentioned constitution.

According to the heat-insulating cement composition of the present invention, a heat-resistant block having excellent heat-insulating performance can be obtained by molding and solidifying the heat-shrinkable cement composition. Further, the heat-resistant cement composition can be applied directly to the outer surface of a building, Performance can be provided.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a table showing the combination and performance of a heat-insulating block according to the present invention, together with a comparative example. Fig.
2 is a graph showing the results of measurement of the reflectance of the solar radiation of the heat-insulating block according to the present invention, together with a comparative example.

BEST MODE FOR CARRYING OUT THE INVENTION Next, the best mode for carrying out the present invention will be described in detail with reference to the drawings.

[Embodiment 1]

The heat-shading block of the present Embodiment 1 mainly includes white cement and heat-shading pigment, and is obtained by molding and solidifying a cement composition containing such white cement and heat-shading pigment.

Then, the white cement is a cement which adheres the aggregates together, and generally white cement is higher than usual portland cement by removing ferric oxide contained in the raw material in ordinary portland cement determined in JIS R5210, Usually, the content of iron (iron oxide) is about 0.2%. As a commercial product of white cement, "white cement" made by Taiheiyo Cement Co., Ltd. can be mentioned. The degree of whiteness of "white cement" is 90 degrees according to the Hunter method (in accordance with JIS P8123).

Generally, the heat-sensitive pigment is a material including iron chromium-based material, black iron oxide material, rare earth manganese oxide, etc., and a relatively low-brightness material having a brightness of 50 or less is used. When the brightness of the heat-sensitive pigment is 50 or less and the solar radiation reflectance is 40% or more, the lightness (L value) of the block itself is 30 to 60 by mixing it with white cement, and the solar radiation reflectance is 40% It becomes very easy.

Generally, in order to increase the reflectance of solar radiation, it is preferable to increase the lightness (L value), that is, to give white light. However, these light-heat pigments exhibit a relatively low lightness (L value), that is, grayish or blackish- .

9580 ", " 9596 ", Daiichi Seika Kogyo Kabushiki Kaisha JEDI-PIKOXIDE COLOR BLACK "9581", "9596", a heat black pigment "HR-GB" 42-707A ", " 42-703A ", which is manufactured by Asahi Kasei Kogyo Co., Ltd., and 6350 " 6301 "

The mixing ratio of the white cement to the heat-sensitive pigment is not particularly limited. However, the heat-sensitive coloring pigments not only provide the heat-shielding performance but also serve as pigments for adjusting the lightness of the heat-shielding block of this embodiment. Therefore, It is concealed that the brightness may become excessively high. On the other hand, if the mixing ratio of the heat-sensitive coloring pigments is too large, there is a fear that the performance of bonding the aggregate of the white cement to the white cement may be impaired. Therefore, the mixing ratio of the heat-sensitive pigment to the 100 parts by weight of the white cement is preferably 0.1 to 10 parts by weight.

Other materials in the range of the brightness (L value) of the block itself other than the white cement and the heat-shading pigment to 30 to 60 and the solar radiation reflectance to be not less than 40% May be used in combination. For example, aggregates can be mentioned. As the aggregate, natural stones such as silica sand, limestone, gravel stone, crushed stone, granite, and marble, aluminum oxide, porcelain slab, marble slab, glass slab, crushed stone, ceramic and the like are mainly used and their grain sizes are about 0.5 to 3 mm And is more preferably used.

The ordinary Portland cement which is generally used may be added to the bag cement within a range not significantly deteriorating the heat shielding performance.

As another compounding material, blast furnace slag (JIS A5011-1) can be mentioned. Blast furnace slag usually contains a large amount of components common to portland cement, but the content of iron is low, and even when mixed with white cement, the decrease in reflectance of solar radiation is small.

The heat-insulating block of the present embodiment is completed by adding other materials to the white cement and the heat-shading pigment as required, adding water, kneading the mixture, molding the mixture into a mold frame, and curing the material for a proper period of time. In order to facilitate kneading, an admixture or the like may be added.

Another embodiment of the present invention includes a two-layer structure or a three-layer structure or more in which a block for a primer is first molded at the time of block molding, and a heat-insulating block is integrally formed thereon. The shape of the heat-insulating block is generally plate-like when used in a packing block, and both the width dimension and the depth dimension are 10 to 500 mm and the thickness dimension is 5 to 100 mm. Also, the heat-insulating block may be molded into a so-called concrete block used for a block wall.

[Embodiment 2]

The heat-insulating block according to the second embodiment differs from the heat-diffusing block according to the first embodiment in that the first embodiment includes the white cement and the heat-shone pigment, while the second embodiment differs from the first embodiment in that the heat-

That is, the heat-shrinkable block of the second embodiment includes the white cement, the heat-sensitive pigment and the white aggregate, and is obtained by molding and solidifying the cement composition including the white cement, the heat-sensitive pigment and the white aggregate.

The back cement is to bond the back aggregates together. The white cement and the heat-sensitive coloring pigment are the same as those in the first embodiment, and therefore the description thereof is omitted here.

As the backing aggregate, limestone (calcium carbonate) is generally used, but in addition, one or two or more kinds selected from a granular material and a powder material containing talc, quartz, aluminum oxide, aluminum hydroxide, magnesium hydroxide, Can be used. The granular material mainly used is one having a grain size of about 0.5 to 3 mm. Among them, limestone (calcium carbonate) has a relatively low hardness, so it is preferable to use it because it is difficult to cause abrasion and scratches on the contact surface with a manufacturing facility such as a kneader, is relatively inexpensive, and the particle size is easy to be arranged.

The mixing ratio of the backing aggregate to the white cement is not particularly limited, but the blending ratio of the backing aggregate and the white cement may be determined within the range where the backing aggregates can be adhered to each other using the white cement as a binder.

(L value) of the block itself formed in addition to the white cement, the white aggregate and the heat-shading pigment is set to 30 to 60, and other materials in the range of not lowering the solar radiation reflectance to not less than 40% It may be used in combination with the heat-insulating block. For example, aggregates other than the white aggregate may be mentioned. As the aggregate, natural stones such as silica sand, gravel stone, crushed stone, granite and marble, porcelain slabs, marble slabs, glass slabs, ceramics and the like are preferably used.

The heat-shading block of the present embodiment is completed by adding other materials as necessary to white cement, white aggregate and heat-sensitive coloring material, adding water, kneading it, molding it in a mold frame, and curing it for a suitable period of time. In order to facilitate kneading, an admixture or the like may be added.

Another embodiment of the present invention includes a two-layer structure or a three-layer structure or more in which a block for a primer is first molded at the time of block molding, and a heat-insulating block is integrally formed thereon. The shape of the heat-resistant block is generally plate-like when used in a paving block, and both the width dimension and the depth dimension are 10 to 500 mm and the thickness dimension is 5 to 100 mm. It may also be molded into a so-called concrete block used for a block wall.

Next, an embodiment of the present embodiment will be described with reference to the drawings.

≪ Example 1 >

White cement "manufactured by Taiheiyo Cement Co., Ltd. as a white cement, black heat pigment" Black 6350 "made by Asahi Kasei Corporation as a heat-sensitive pigment, silica sand and water as an aggregate were kneaded at a blending ratio shown in Fig. 1, After molding, it was cured to prepare a test piece, and the result was regarded as Example 1. The following lamp irradiation test, reflectance measurement test, brightness measurement test and visibility evaluation test were carried out for Example 1, and the results are shown in Fig. 1 and Fig.

[Lamp irradiation test]

The prepared specimens were irradiated with a beam lamp "BRF110V / 150W" manufactured by Toshiba Latech Co., Ltd. for a predetermined period of time in accordance with the "heat-sensitive packaging indoor irradiation test method" did. The reference test piece was subjected to the lamp irradiation test using a specimen cut from an asphalt road as a reference test piece, and the time until the surface temperature reached 23 占 폚 to 60 占 폚 was set as the irradiation time (T). That is, the surface temperature of the test piece after irradiating time (T) was measured by irradiating the beam lamp with the initial surface temperature of 23 ° C of the test piece of Example 1, Temperature (占 폚) ". The difference from the surface temperature of Comparative Example 1 described later is shown in the column of " effect of suppressing the temperature rise " in Fig. 1 as an effect of suppressing the temperature rise. In the column of " suppression effect of temperature rise (° C) " in Fig. 1, if the effect of suppressing the temperature rise is negative, the surface temperature is lower than the surface temperature of Comparative Example 1, The surface temperature of Comparative Example 1 is higher than that of the surface of Comparative Example 1, so that the effect of suppressing the temperature rise can not be confirmed.

[Reflectance measurement test]

The prepared test piece was irradiated with ultraviolet light (wavelength: 780 to 2500 nm) using a magnetic spectrophotometer " UV-3150 " manufactured by Shimadzu Seisakusho Co., Ltd., having a resolution of 1 nm according to JIS K5602 ), And from the " heavy weight coefficient " at each wavelength described in " heavy solar light weight factor " in Table 1 of JIS K5602 in this measurement value, , And the calculated reflectance of the reflectance is shown in the column of "reflectance (%) of the reflectance" in FIG. Further, in the measurement test, a white plate made of barium sulfate was used instead of the standard white plate of the fluororesin standard prescribed in JIS K5602 as a standard white plate. The measurement results of the reflectance at each wavelength (nm) are shown in Fig.

 [Brightness measurement test]

Using the colorimetric tester "SE-2000" manufactured by Nippon Denshoku Kogyo K.K., the spectral reflectance coefficient was measured on the basis of JIS Z8722 (color measurement method), and the three stimulus values prescribed in JIS K8701 were obtained From now on, the L * value is calculated based on JIS K7105, and the value is used as the brightness (L value). The result is shown in the column of " brightness (L value) "

 [Visibility Evaluation Test]

The test specimens were evaluated by five persons. The test specimens were observed and the appearance was averaged. The results were shown as " x " when the glare was felt and when the glare was not felt, .

≪ Example 2 >

In the same manner as in Example 1, except that the raw material was a white aggregate obtained by pulverizing limestone as an aggregate in Example 1, kneaded in the same manner as in Example 1, vibrated after the vibration press molding, and cured to prepare a test piece. In the same manner as in Example 1, the following lamp irradiation test, reflectance measurement test, brightness measurement test and visibility evaluation test were carried out for Example 2, and the results are shown in Figs.

≪ Comparative Example 1 &

(Black) " 330C " manufactured by LANXESS CORPORATION, which is a black pigment as a pigment, and water are kneaded at a compounding ratio shown in Fig. 1, and a vibration press Molded and cured to prepare a test piece, which was designated as Comparative Example 1. A lamp irradiation test, a reflectance measurement test, a brightness measurement test, and a visibility evaluation test were carried out for this Comparative Example 1 as in Example 1, and the results are shown in Figs. 1 and 2. Fig.

≪ Comparative Example 2 &

Black pigment "Black6350" made by Asahi Kasei Corporation as the aggregate, ordinary portland cement and heat-shading pigment, and water were kneaded at the compounding ratio shown in FIG. 1, and subjected to vibration press molding and cured to prepare test pieces. did. A lamp irradiation test, a reflectance measurement test, a brightness measurement test and a visibility evaluation test were carried out for this Comparative Example 2 as in Example 1, and the results are shown in Figs. 1 and 2. Fig.

≪ Comparative Example 3 &

(Black) "330C" manufactured by LANXESS Co., Ltd., and water as the aggregate, white cement, and water were kneaded in the mixing ratios shown in FIG. 1, cured after the vibration press molding and cured. A lamp irradiation test, a reflectance measurement test, a brightness measurement test and a visibility evaluation test were carried out for this Comparative Example 3 as in Example 1, and the results are shown in Fig. 1 and Fig.

The lightness of the pigments used in this example and the comparative example was measured according to the lightness measurement test. As a result, the brightness of the black pigment "Black 6350" was 27.55 and the brightness of the general pigment "330C" was 17.18.

As shown in Fig. 1, in Comparative Example 2 in which a heat-sensitive pigment was blended instead of a general pigment in Comparative Example 1, the reflectance of the solar radiation was slightly increased, thereby lowering the surface temperature. However, The white cement was blended in place of cement, and in Example 1 using the heat-sensitive pigment, the solar radiation reflectance was 40% or more, which was extremely high, thereby confirming the effect of reducing the surface concentration to -10.3 degrees.

In Comparative Example 3 in which white cement was added instead of ordinary Portland cement in Comparative Example 1, the solar radiation reflectance was slightly increased, but the effect of lowering the surface temperature was not confirmed. When this result is compared with the results of Example 1, in Comparative Example 3 where the pigment is not a heat-releasing pigment even when white cement is used, the reflectance of the solar radiation becomes too high, but the effect of lowering the surface temperature is not confirmed In Example 1 using the white cement and the heat-sensitive pigment, the solar radiation reflectance was 40% or more, which was extremely high, and a very large surface temperature lowering effect was confirmed.

The solar radiation reflectance for these examples and comparative examples is remarkably shown as shown in Fig. 2 shows the wavelength (nm) in the near-infrared range on the horizontal axis and the spectral reflectance (%) in the wavelength (7 nm) on the vertical axis. As shown in Fig. 2, In Comparative Example 3 in which the cement was replaced with white cement, the reflectance of the solar radiation was slightly improved, but no barytes were observed. In Comparative Example 2 in which a heat pigment was added to the general pigment in Comparative Example 1, the result was that the solar radiation reflectance gradually increased from the short wavelength side toward the long wavelength side in the near infrared region. On the other hand, in Example 1 and Example 2, a high solar reflectance was exhibited throughout the near infrared region. From these measurement results, it is also suggested that the combination of the white cement and the heat-sensitive pigment increases the solar radiation reflectance in the near-infrared region, which contributes greatly to the reduction of the surface temperature.

Further, in comparison between Example 1 and Example 2, it was found that the solar radiation reflectance was further increased by using the blackbody instead of silica sand as the aggregate, and the temperature suppressing effect was further improved.

From the above measurement results, it was confirmed that the use of the white cement and the heat-shading pigment showed a remarkable effect of lowering the surface temperature, and the solar radiation reflectance was 40% or more in this case. On the other hand, In the case of using cement, even when white cement is used, when the heat pigment is not used, the effect of lowering the surface temperature is not confirmed, and the reflectance of solar radiation is less than 30% in this case.

Therefore, it was confirmed that a very large surface temperature lowering effect was confirmed by setting the solar radiation reflectance to 40% or more by using the white cement and the heat-shading pigment, and the lightness (L value) was 30 To 60, it becomes a gray or blackish dark color, and it can be understood that there is no problem in distinguishing from the glare and the white partition line.

From the above measurement results, it was confirmed that the use of the white cement and the heat-shading pigment showed a relatively large reduction in the surface temperature, and the solar radiation reflectance was 40% or more in this case. However, by using the white aggregate as the aggregate, And the lowering effect was confirmed.

Therefore, when the solar radiation reflectance is set to 40% or more by using the white cement, the heat-color pigment and the white aggregate, a very large surface temperature lowering effect is confirmed. In this case as well, Is in the range of 30 to 60, it becomes gray or blackish darkish color, and it can be seen that there is no problem in distinguishing from the glare and the white partition line.

The heat-shrinkable block according to the present invention is preferably used where it is desired to have heat-shielding performance such as a packing block or a block wall. Further, the heat-shrinkable cement composition according to the present invention is preferably used for producing heat-shrinkable blocks having excellent heat-shading performance, and is preferably used for their applications such as providing heat-shielding performance to buildings such as outer walls and rooftops of buildings Is used.

This application claims priority under Japanese Patent Application No. 2011-070486, filed on March 28, 2011, and Japanese Patent Application No. 2011-071520, filed on March 29, 2011, both of which are incorporated herein by reference. By reference to this, all of which is incorporated into the present application.

Claims (7)

Heat block having a lightness (L value) of 30 to 60 and a solar radiation reflectance of 40% or more, which contains white cement,
Wherein the heat-sensitive pigment has a lightness (L value) of 50 or less, a solar radiation reflectance of 40% or more, and a mixing ratio of the heat-sensitive pigment is 0.1 to 10 parts by weight with respect to 100 parts by weight of the white cement, , And does not contain aggregates other than the white aggregate. A cement composition comprising white cement, heat-sensitive pigment, and whitening material,
(L value) of 30 to 60 and a solar radiation reflectance of 40% or more when the cement composition is solidified, and the light-heat pigment has a lightness (L value) of 50 or less and a solar radiation reflectance of 40% The heat-sensitive cement composition according to claim 1, wherein the blend ratio of the heat-sensitive pigment is 0.1 to 10 parts by weight based on 100 parts by weight of the white cement, and the whiteness material is limestone alone and does not include aggregates other than the white aggregate. delete delete delete delete delete

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