KR20120112033A - Heat-shielding block and heat-shielding cement composition - Google Patents

Abstract

PURPOSE: A heat-shielding block and thermal resistant cement composite are provided to enhance high thermal resistance without increasing brightness. CONSTITUTION: A heat-shielding block contains thermal resistant pigment, and has brightness of 30-60 and solar radiation reflectivity of 40% or greater. The thermal resistant block contains white cement, thermal resistant pigment, and bone ash, and has brightness of 30-60 and solar radiation reflectivity of 40% or greater. The bone ash is limestone. The thermal resistant cement includes the white cement and thermal resistant pigment, and has brightness in the solidified state of 30-60 and solar radiation reflectivity of 40% or greater. [Reference numerals] (AA) Number of weight; (BB) Practical example 1; (CC) Practical example 2; (DD) Comparative example 1; (EE) Comparative example 2; (FF) Comparative example 3; (GG) Mixing; (HH) Quartz sand; (II) Skeleton ash(limestone); (JJ) White cement; (KK) Normal Portland cement; (LL) Heat resistant pigment; (MM) Normal pigment; (NN) Wool; (OO) Measuring result; (PP) Surface temperature(°C); (QQ) Suppressing effects of temperature increase(°C); (RR) General reflection rate(°C); (SS) Brightness(L value); (TT) Visibility, Feeling dazzling: X, Not feeling dazzling: O

Description

Heat shield block and heat shield cement composition {HEAT-SHIELDING BLOCK AND HEAT-SHIELDING CEMENT COMPOSITION}

The present invention relates to heat shielding blocks and heat shielding cement compositions, and more particularly to heat shielding blocks and heat shielding cement compositions which can be suitably used as paving blocks.

As a paving block attached to a road surface such as a sidewalk or a bicycle road, a molded sheet is generally used as the material of aggregate, cement and pigment. In order to alleviate the heat island phenomenon caused by the temperature rise in summer, such paving blocks include water-retaining material and water-retaining material, a heat-resistant coating on the block, or a relatively rough aggregate or porous aggregate. A number of studies have been made with the attention of a heat shield block having a given heat shield performance.

For example, Japanese Patent Application Laid-Open No. 7-10627 discloses a weight ratio of 30 to 60%, titanium oxide 3 to 10%, silica balloon 10 to 20%, mica 1 to 5%, aggregate 10 to 30%, and the like. 30-60% white cement, 3-10% titanium oxide, mica 1-5%, glass piece 5-30%, sunscreen 0.5-2%, pigment 0.1-2%, aggregate 10- A cement composite heat reflecting paint is proposed for each base material comprising 1% or less thickener, etc., added to each of the top coat materials containing 30%, etc., by further mixing admixtures and clear water. have.

However, the paint is mainly used for roofs, rooftops or ship decks of general buildings as described in the above publications, and a mixture of white cement, titanium oxide, and the like with white appearance is incorporated. When the paint is used as a paint for paving blocks, the appearance becomes white, which causes problems such as feeling that the passengers are dazzling or difficult to distinguish from white partition lines. It is considered suitable for ship decks and the like, but not for paving blocks. That is, in the paving block, it is necessary to provide the heat shielding performance without making the appearance white.

This invention is made | formed in view of such a situation, and does not make an external appearance white, ie, does not raise brightness (it shows the L * value measured by the brightness measurement test mentioned later, and calls it "L value" below). It is an object to provide a heat shielding block and a heat shielding cement composition which are equipped with high heat shielding performance and which can be particularly preferably used for paving blocks.

MEANS TO SOLVE THE PROBLEM In order to solve the said subject, as a result of earnestly researching, the present inventors can provide heat shielding performance by raising the solar reflectance in a block, especially the near-infrared wavelength (wavelength: 780-2500nm), and the solar radiation of a block. Consideration is given to the use of heat shield pigments to increase reflectivity, or to use gray or blackish dark heat shield pigments to increase solar reflectance without increasing the brightness (L value) of the block, but When the heat shield pigment is mixed with ordinary portland cement which is a cement composition, the solar reflectance of the heat shield pigment is not expressed in the block, and the solar reflectance of the block is not so high. On the other hand, the heat shield pigment is a white portland cement (hereinafter, When mixed with the back cement), the solar reflectance of the heat shield pigment is expressed in the block, and thus high solar radiation A block of tetragonal ratio is obtained, which can provide a high heat shielding performance, and when the white aggregate is added to the back cement, a higher solar reflectance is obtained than in the case of the back cement alone. It is possible to provide the heat shielding performance, and when the brightness (L value) is set to 30 to 60, no problem occurs in distinguishing the glare or the white partition line, and when the solar reflectance is set to 40% or more, the effective heat shielding performance is obtained. The present invention was completed by acquiring what is provided.

That is, the heat shielding block according to the present invention is characterized by containing a white cement and a heat shielding pigment, having a brightness (L value) of 30 to 60, and having a solar reflectance of 40% or more.

According to the heat shield block according to the present invention, since the white cement and the heat shield pigment are contained, the solar reflectance of the heat shield pigment is effectively expressed in the block, and the brightness (L value) is 30 to 60, and the solar reflectance is 40%. Thus, when the heat shield block is placed on a sidewalk or the like, the brightness is relatively low, so that a passenger may not feel dazzling, may be distinguished from the white partition line, and a significant temperature suppression effect may be expected.

In the present invention, the reason why the solar reflectance of the heat shield pigment is effectively expressed in the block by containing the heat shield pigment and the back cement is not clear. However, since the back cement is very white, the solar reflectance of the heat shield pigment is not impaired. It is believed to be expressed in the block, and since the back cement is a cement that is whiter than ordinary portland cement by removing iron such as ferric oxide, which is usually included in portland cement, iron affects the solar reflectance. In ordinary Portland cement with a lot of iron, the solar reflectance of the heat shield pigment is impaired, and the solar reflectance is not impaired in the back cement from which iron is removed, so that even if the brightness (L value) of the block itself is lowered, Solar reflectance damaged by back cement It is expressed in a block without.

It is preferable that the heat shield block which concerns on this invention is a structure which further contains a white aggregate with respect to the said structure.

According to this structure, the following effect can be added further to the said effect. That is, although silica sand etc. are normally used as aggregate, in this structure, it changes to this silica sand etc., or replaces some parts of silica sand etc. with white aggregate. Although the reason is not clear, the brightness of the block itself is considered to be that the solar reflectance of the heat shield pigment damaged by silica sand is not impaired the solar reflectance of the heat shield pigment like the cement in the white aggregate. Even if (L value) is reduced, the high solar reflectance of the heat shield pigment is expressed in the block without being damaged by the back cement and the white aggregate added thereto.

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

Thus, when the brightness pigment (L value) is 50 or less and the solar reflectance is 40% or more, the brightness (L value) of the block itself is 30 to 60, and the solar reflectance is 40% or more. It becomes easy.

In the heat shielding block containing the white aggregate according to the present invention, the white aggregate is preferably limestone (calcium carbonate). In this configuration, since limestone (calcium carbonate) has a relatively low hardness, abrasion and scratches are less likely to occur on the contact surface with manufacturing equipment such as a kneader, and the particle size is easy to be displayed.

In addition, the heat shielding cement composition according to the present invention is a cement composition containing a back cement and a heat shielding pigment, in which the brightness (L value) is 30 to 60 and the solar reflectance is 40% or more in the solidified state of the cement composition. It is characterized.

It is preferable that the heat shielding cement composition of this structure is a structure which further contains a white aggregate with respect to the said structure.

According to the heat shielding cement composition according to the present invention, by forming and solidifying the heat shielding cement composition, a heat shielding block having excellent heat shielding performance is obtained. Performance can be provided.

BRIEF DESCRIPTION OF THE DRAWINGS The table which shows the compounding and the performance of the heat shield block by this invention with a comparative example.
2 is a graph showing the measurement result of the solar reflectance of the heat shield block according to the present invention together with a comparative example.

Next, the best mode for implementing this invention is demonstrated concretely with reference to drawings.

[Embodiment 1]

The heat shield block of the first embodiment mainly includes a white cement and a heat shield pigment, and is obtained by molding and solidifying a cement composition containing the back cement and the heat shield pigment.

Subsequently, the back cement is a cement which bonds the aggregates together, and is generally cement having a higher degree of whiteness than the ordinary portland cement by removing the ferric oxide contained in the raw material in the ordinary portland cement determined in JIS R5210, Usually, the content of iron powder (iron oxide) is about 0.2%. As a commercial item of a back cement, "White cement" by Taiheiyo Cement Co., Ltd. is mentioned. In addition, the whiteness degree of "white cement" is about 90 degrees by the Hunter system (based on JIS P8123).

The heat shielding pigment is generally an iron chromium-based material, a black iron oxide material, a material containing rare earth manganese oxide, or the like, and a relatively low brightness material having a brightness of 50 or less is used. If the brightness of the heat shield pigment is 50 or less, and the solar reflectance is 40% or more, the brightness (L value) of the block itself is 30 to 60 and the solar reflectance is 40% or more by mixing this with the back cement. It becomes very easy.

Generally, it is good to increase the brightness (L value) in order to increase the solar reflectance, that is, it is good to make it white. However, these heat shield pigments have a low brightness (L value), that is, a dark or grayish black color and high solar reflectance. .

As a commercial item of a heat shielding pigment, Daiichi Seika Kogyo Co., Ltd. dipyroxide color black "9581", "9590", "9596", heat shield black pigment "HR-GB" made by Toda Kogyo Co., Ltd., Tokan Material Technology Co., Ltd. The heat shielding pigment "42-707A" made by Kaisha, "42-703A", the heat shielding pigment "6350" made by Asahi Kasei Kogyo Co., Ltd., "6301", etc. are mentioned.

Although the mixing ratio of the back cement and the heat shield pigment is not particularly limited, the heat shield pigment is not only a heat shielding performance but also a pigment for adjusting the brightness of the heat shield block of the present embodiment. There is a fear that the brightness is too high to be concealed. On the other hand, when there are too many compounding ratios of a heat shielding pigment, there exists a possibility that the performance which adhere | attaches the aggregate which a back cement has can be impaired. Therefore, as for the compounding ratio of a heat shield pigment with respect to 100 weight part of back cement, 0.1-10 weight part is preferable.

The heat shield block according to the embodiment of the present invention is made of another material within a range that does not interfere with the brightness (L value) of the block itself formed in addition to the white cement and the heat shield pigment to 30 to 60 and the solar reflectance to 40% or more. You may mix and use in. For example, aggregate can be mentioned. As aggregate, natural stone such as silica sand, limestone, gravel stone, crushed stone, granite, marble, aluminum oxide, porcelain piece, hydrated stone, glass crushed material, crushed stone, ceramic, etc. are used, and those containing mainly particles having a particle diameter of about 0.5 to 3 mm are used. More preferably used.

Moreover, you may add the common portland cement generally used to a back cement in the range which does not significantly reduce heat shielding performance.

Moreover, blast furnace slag (JIS A5011-1) is mentioned as another compounding material. Blast furnace slag usually contains a lot of components common to Portland cement, but the iron content is low, so even when kneaded in the back cement, the solar reflectance decreases little.

The heat shielding block of the present embodiment is completed by adding another material as necessary to the back cement and the heat shielding pigment, kneading by further adding water, and then molding the mold by inserting it into a mold frame, and further curing timely. Moreover, you may add an admixture etc. in order to make it easy to knead.

Moreover, as another embodiment of this invention, the thing of the two-layered structure or three or more layers which formed the block for primers at the time of block shaping | molding, and integrally formed the heat shielding block on it is mentioned. When used for a paving block, the shape of a heat shield block is generally plate-shaped, and both the width dimension and the depth dimension are 10-500 mm, and the thickness dimension is 5-100 mm. Moreover, you may shape | mold and use a heat shield block in what is called a concrete block shape used for a block wall.

[Embodiment 2]

The heat shield block of the second embodiment differs in that the heat shield block of the first embodiment further includes a white aggregate in the second embodiment, whereas the first block includes the back cement and the heat shield pigment.

That is, the heat shield block of this Embodiment 2 is what contains these white cement, heat shield pigment, and white aggregate, and is obtained by shape | molding and solidifying the cement composition containing this back cement, heat shield pigment, and white aggregate.

The back cement bonds the white aggregates together. Since it is the same as that of Embodiment 1 about a white cement and a heat shielding pigment, description is abbreviate | omitted here.

In general, limestone (calcium carbonate) is preferably used as the white aggregate, but in addition, one or two or more kinds selected from granular materials and powdery materials composed mainly of talc, quartz, aluminum oxide, aluminum hydroxide, magnesium hydroxide, etc. Can be used. As the granular material, those containing mainly those having a particle diameter of about 0.5 to 3 mm are used. Among them, limestone (calcium carbonate) is relatively low in hardness, and therefore, wear and scratches are less likely to occur on contact surfaces with manufacturing equipment such as kneaders, and are relatively inexpensive and easy to clean.

The mixing ratio of the white aggregate and the back cement is not particularly limited, but the mixing ratio of the white aggregate and the back cement may be determined in a range in which the white aggregate can be bonded to each other using the back cement as a binder.

Other materials are provided in this embodiment in a range where the brightness (L value) of the block itself formed in addition to the back cement, the white aggregate, and the heat shield pigment is 30 to 60, and the solar reflectance is not more than 40%. You may mix and use for a heat shield block. For example, aggregates other than a white aggregate are mentioned. As this aggregate, natural stone, such as silica sand, gravel stone, crushed stone, granite, marble, ceramics piece, a stone, glass crushed material, ceramics, etc. are used, and what mainly contains the thing whose particle diameter is about 0.5-3 mm is used more preferably.

The heat shielding block of the present embodiment is completed by adding other materials as necessary to the back cement, the white aggregate and the heat shielding pigment, kneading with further adding water, and then molding into a mold frame and curing further for a timely period. Moreover, you may add an admixture etc. in order to make it easy to knead.

Moreover, as another embodiment of this invention, the thing of the two-layered structure or three or more layers which formed the block for primers at the time of block shaping | molding, and integrally formed the heat shielding block on it is mentioned. The shape of a heat shield block is generally plate-shaped when it is used for a paving block, and both the width dimension and the depth dimension are 10-500 mm, and the thickness dimension is 5-100 mm. Moreover, you may shape | mold and use what is called a concrete block shape used for a block wall.

Next, the Example in this embodiment is demonstrated, referring drawings.

≪ Example 1 >

"White cement" made by Taiheiyo Cement Co., Ltd. as a back cement, heat shield pigment "Black6350" made by Asahi Kasei Co., Ltd. as a heat shielding pigment, silica sand and water as an aggregate are mixed at the blending ratio shown in FIG. It cured after shaping | molding, the test piece was created, and it was set as Example 1. The following lamp irradiation test, reflectance measurement test, brightness measurement test, and visibility evaluation test were performed with respect to this Example 1, and the result is shown to FIG. 1, FIG.

[Lamp investigation test]

About the created test piece, we irradiate beam lamp "BRF110V / 150W" made by Toshiba Lighttech Co., Ltd. for a predetermined time based on "heat-shielding packaging room research test method" that the heat-shielding packaging technology meeting for the study prescribes, and measures surface temperature at that time did. In addition, the said lamp irradiation test was done to this reference test piece using what cut out from an asphalt road as a reference test piece, and made time until the surface temperature became 23 degreeC-60 degreeC as irradiation time (T). That is, the initial surface temperature of the test piece of Example 1 is made into 23 degreeC, the said beam lamp is irradiated to this, the surface temperature of the said test piece is measured after irradiation time T, and the result is shown in the "surface of FIG. Temperature (° C) ''. In addition, the difference with the surface temperature of the comparative example 1 mentioned later was shown in the column of the "inhibition effect of temperature rise" of FIG. 1 as an effect of suppressing temperature rise. In the column of "inhibition effect of temperature rise (° C)" in FIG. 1, if the suppression effect of temperature rise is a negative value, surface temperature is low compared with the surface temperature of Comparative Example 1, and the suppression effect of temperature rise is confirmed, and if it is a positive value Compared with the surface temperature of the comparative example 1, surface temperature is high and the effect of suppressing temperature rise is not recognized.

Reflectance Measurement Test

Near-infrared wavelength (wavelength: 780-2500 nm) using the magnetic spectrophotometer "UV-3150" made by Shimadzu Seisakusho Co., Ltd. with a resolution of 1 nm according to JIS K5602 (method for obtaining the solar reflectance of the coating film) of the prepared test piece. Spectral reflectance is measured and the method of obtaining the "8 solar reflectance" of JIS K5602 from "medium weight coefficient" in each wavelength described in "weighted coefficient of reference | standard light" of Table 1 of JIS K5602 in this measured value. The solar reflectance is computed from the formula of ", and the calculated solar reflectance is shown in the column of" the solar reflectance (%) "of FIG. In addition, in the said measurement test, the white board which consists of barium sulfate was used for the standard white board instead of the fluorine resin standard white board prescribed | regulated to JISK5602. The measurement result of the reflectance in each wavelength (nm) is shown in FIG.

 [Lightness Measurement Test]

Using the Nippon Denshoku Kogyo Co., Ltd. colorimetry tester "SE-2000", the spectral reflectance coefficients were measured according to JIS Z8722 (Measuring method of color), and the tristimulus values prescribed in JIS K8701 were obtained. From now on, based on JIS K7105, L * value is calculated, and the value is made into brightness (L value), and the result is shown in the column of "Brightness (L value)" of FIG.

 [Visibility Evaluation Test]

The person who evaluates the created test piece is set to 5 people, and the case of observing the test piece and averaging the appearance and feeling glare as "x" and the case of not feeling glare as "○" are shown as the result of the "visibility" of FIG. Column is shown.

<Example 2>

In Example 1, the same mixture as in Example 1 was kneaded, except that white aggregate formed by grinding limestone as an aggregate was kneaded, cured after vibration press molding, and a test piece was prepared to be Example 2. In Example 2, the following lamp irradiation test, reflectance measurement test, brightness measurement test, and visibility evaluation test were performed in the same manner as in Example 1, and the results are shown in Figs.

&Lt; Comparative Example 1 &

Silica sand as an aggregate, ordinary portland cement prescribed in JIS R5210, and Viperox (black) "330C" made by LANXESS Co., Ltd., which are black general pigments as pigments, and water are kneaded at a blending ratio shown in FIG. It cured after shaping | molding, the test piece was created, and it was set as the comparative example 1. A lamp irradiation test, a reflectance measurement test, a brightness measurement test, and a visibility evaluation test are performed with respect to this comparative example 1, and the result is shown to FIG. 1, FIG.

Comparative Example 2

As a aggregate, silica sand, ordinary portland cement, and Asahi Kasei Kogyo Co., Ltd. heat shield pigment "Black6350" and water were kneaded at a blending ratio shown in FIG. did. About this comparative example 2, the lamp irradiation test, the reflectance measurement test, the brightness measurement test, and the visibility evaluation test are performed like Example 1, and the result is shown to FIG. 1, FIG.

&Lt; Comparative Example 3 &

As a aggregate, the silica sand, the back cement, and the pigment made by LANXESS biferox (black) "330C" and water were knead | mixed in the compounding ratio shown in FIG. 1, and the thing hardened after vibration press molding was made into the comparative example 3. About this comparative example 3, the lamp irradiation test, the reflectance measurement test, the brightness measurement test, and the visibility evaluation test are performed like Example 1, and the result is shown to FIG. 1, FIG.

In addition, the brightness of the pigment used by the present Example and the comparative example measured according to the said brightness measurement test, the brightness of heat shield pigment "Black6350" was 27.55, and the brightness of general pigment "330C" was 17.18.

As shown in FIG. 1, in Comparative Example 2 in which a heat shielding pigment was added to the comparative example 1 instead of the general pigment, the solar reflectance was slightly increased, thereby lowering the surface temperature. However, the lowering effect was lower than -1.4 degrees. In Example 1 using a cement cement instead of cement, and using a heat shielding pigment, the solar reflectance was 40% or more and extremely high, whereby a very large surface concentration-lowering effect was confirmed.

In addition, in Comparative Example 3 in which a back cement was incorporated in place of ordinary portland cement for Comparative Example 1, the solar reflectance slightly increased, but the effect of lowering the surface temperature was not confirmed. Considering both the results and the results of Example 1, in the case of Comparative Example 3 using a general inorganic pigment in which the pigment is not a heat shielding pigment even if the back cement is used, the solar reflectance is only high, but the effect of lowering the surface temperature is not confirmed. In Example 1 using a white cement and a heat shielding pigment, the solar reflectance was 40% or more and extremely high, and the effect of lowering a very large surface temperature was confirmed.

The solar reflectances for these examples and comparative examples are markedly shown in FIG. 2. That is, FIG. 2 shows the spectral reflectance (%) at wavelength (nm) in the near infrared region on the horizontal axis, and the wavelength (7 nm) on the vertical axis. As shown in FIG. In Comparative Example 3 in which was replaced with back cement, the solar reflectance slightly improved, but the balance was not confirmed. In Comparative Example 2, in which the heat shield pigment was added to the general pigment in comparison with Comparative Example 1, the solar reflectance gradually increased from the short wavelength side to the long wavelength side in the near infrared region. On the other hand, in Example 1 and Example 2, the high solar reflectance was shown over the whole near-infrared region. Also from this measurement result, the combination of a white cement and a heat shield pigment raises the solar reflectance of a near-infrared region, and this suggests that it contributes greatly to the fall of surface temperature.

Moreover, when Example 1 and Example 2 were compared, it turned out that when white bone is used instead of silica sand as aggregate, a solar reflectance becomes high and temperature suppression effect improves further.

From the above measurement results, the use of the back cement and the heat shield pigment confirms a very large surface temperature reduction effect, and the solar reflectance in that case is 40% or more. On the other hand, even if the heat shield pigment is used, ordinary portland is not used. In the case of using cement, the effect of lowering the large surface temperature was not observed even when the heat cement was not used, and the solar reflectance in that case was less than 30%.

Therefore, when the solar reflectance is made 40% or more using the white cement and the heat shielding pigment, the effect of lowering a very large surface temperature is confirmed, and as shown in Examples 1 and 2, the brightness (L value) is 30. If it is in the range of -60, it becomes a gray or blackish dark color, and it turns out that a problem does not arise in distinguishing from a glare or a white division line.

In addition, from the above measurement results, the effect of lowering the relatively large surface temperature was confirmed by using the back cement and the heat shielding pigment, and the solar reflectance in that case was found to be 40% or more, and further, the surface temperature was increased by using the white aggregate as the aggregate. It was shown that the lowering effect of was confirmed.

Therefore, when the solar reflectance is made 40% or more using the back cement, the heat shielding pigment, and the white aggregate, the effect of lowering a very large surface temperature is confirmed. In this case, as shown in Examples 1 and 2, the brightness (L value) If it is in the range of 30 to 60, it becomes a gray or blackish dark color, and it can be seen that there is no problem in distinguishing from the glare or the white division line.

The heat shield block according to the present invention is preferably used where it is desired to have a heat shielding performance such as a paving block or a block wall. In addition, the heat shielding cement composition according to the present invention is preferably used for producing a heat shielding block having excellent heat shielding performance, and is preferably used for their use, such as to provide heat shielding performance to an exterior wall of a building or a rooftop work. Used.

This application claims the priority based on Japanese Patent Application 2011-070486 for which it applied in Japan on March 28, 2011, and Japanese Patent Application 2011-071520 which was filed in Japan on March 29, 2011. By mentioning this, all the content is provided in this application.

Claims (7)

A heat shield block containing a white cement and a heat shielding pigment, having a brightness (L value) of 30 to 60, and having a solar reflectance of 40% or more. A heat shielding block, comprising a back cement, a heat shielding pigment, and a white aggregate, having a brightness (L value) of 30 to 60, and a solar reflectance of 40% or more. The method of claim 1,
The heat shield pigment has a lightness (L value) of 50 or less and a solar reflectance of 40% or more. The method of claim 2,
The heat shield pigment has a lightness (L value) of 50 or less and a solar reflectance of 40% or more. The method according to claim 2 or 4,
The white aggregate is a heat shield block, characterized in that limestone (calcium carbonate). As a cement composition containing white cement and heat shield pigment:
The cement composition has a lightness (L value) of 30 to 60 in the solidified state, the heat shield cement composition, characterized in that the solar reflectance is 40% or more. As a cement composition containing white cement and heat shielding pigment and white aggregate:
The cement composition is a heat-resistant cement composition, characterized in that the brightness (L value) in the solidified state is 30 to 60, the solar reflectance is 40% or more.

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