JP2017166174A - Sprayed heat insulation material and installation method thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heat insulation material offering high durability after spraying, uniformity in supplies of the material at a time of spraying, and high heat insulating and fireproofing properties, along with an installation method of the heat insulation material.SOLUTION: A sprayed heat insulation material comprises a composition body blending a main component and a sub-component, the main component containing gypsum or hydrated lime, cement, a retardant, a thickener, and an inorganic aggregate, and the sub-component containing an inorganic fiber and a granulated organic foamed resin covered with gypsum on a surface. The sprayed heat insulation material is used for forming a heat insulation layer 2 made of the composition body on an object 1. The sprayed heat insulation material is used further for forming a surface layer 3 made of the main component on a surface of the heat insulation layer 2 opposite the object 1.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a heat insulating material sprayed on a wall surface or a structure for the purpose of improving heat insulating properties, and a method for constructing the heat insulating material. In particular, it is related with the heat insulating material which improved the flame retardance and spray workability | operativity, and the construction method of this heat insulating material.

For example, Patent Document 1 discloses a method for forming a layer of a heat insulating material on an object such as a wall surface or a structure by spraying the object. This is a method in which small particles of foamed synthetic resin such as polystyrene foam are coated with a paste and gypsum and sprayed onto an object to form a heat insulating material layer. Here, the foamed synthetic resin is provided to enhance heat insulation, and the gypsum is provided to impart flame retardancy to the small particles of the foamed synthetic resin.
Patent Document 2 describes a heat insulating material composition containing a binder made of a foamed synthetic resin granular material such as polystyrene foam and an acrylic resin.
Patent Document 3 describes a fire-resistant and heat-insulating laminate comprising a composition containing foamed organic resin particles such as expanded polystyrene, inorganic light-weight particles such as perlite, and an endothermic substance such as aluminum hydroxide. .
Patent Document 4 describes a spray insulating material formed by combining rock wool having heat insulating properties and nonflammability with a synthetic resin.

JP 63-236840 JP 2003-327464 A JP 2011-156799 A JP 2012-87479 A

In the layer of the heat insulating material formed by the method described in Patent Document 1, small particles of the foamed synthetic resin are spray-cured with only gypsum. Therefore, the layer of the heat insulating material after curing is not flexible. For this reason, if the structure that is the object is subjected to displacement or deformation due to strong winds or earthquakes after being formed, or if it is subject to changes over time, the insulation layer is cracked or cracked. May cause damage to the insulation. That is, there is a problem in durability.
In the heat insulating material composition described in Patent Document 2, since the foamed synthetic resin granular material is light, when the heat insulating material composition is sprayed on an object with a pump or the like, the heat insulating material layer is formed. There is a possibility that the material of the heat insulating material composition may not be supplied uniformly. Therefore, the structure of the heat insulating material layer may not be formed uniformly. In addition, the foamed synthetic resin granules are poorly mixed with other raw materials, and when the heat insulating material composition is sprayed on the object, the foamed synthetic resin granules are scattered and the environment of the construction site is deteriorated. This causes a loss of raw material. Furthermore, since the foamed synthetic resin particles are easily charged with static electricity, they tend to harden, and there is a problem that the spraying device is clogged when sprayed.
The composition which comprises the laminated body described in patent document 3 cannot be sprayed, but must be constructed by ironing etc. Therefore, it takes time for construction.
In the heat insulating material described in Patent Document 4, when a large amount of synthetic resin as a binder is blended, nonflammability is inhibited, and when a small amount is blended, the bonding strength decreases. Therefore, there has been a problem that the degree of freedom in blending the synthetic resin is limited. Moreover, in the heat insulating material of patent document 4, although a surface material is sprayed, there also exists a problem which has to prepare the slurry for a heat insulating material layer which is a base material, and a surface material layer separately.
An object of the present invention is to provide a heat insulating material that is excellent in durability after spraying, is uniformly supplied with a material at the time of spraying, and has excellent heat insulating properties and non-flammability, and a method for applying the heat insulating material.

  The spray insulation includes a main composition comprising gypsum or slaked lime, cement, a retarder, a thickener, and an inorganic aggregate, inorganic fibers, and organic foamed resin particles coated with gypsum on the surface. It consists of the composition which mix | blended the subcomposition, and is used in order to form the heat insulation layer which consists of this composition on a target object.

1. The heat insulating material is blended with organic foamed resin granules whose surface is coated with gypsum as a main composition. Synthetic foamed resin enhances heat insulation, and gypsum imparts flame retardancy. By covering the organic foamed resin particles with gypsum, a heat insulating material with excellent heat insulation and flame retardancy (nonflammability) is obtained. I can do it.
In addition, organic foamed resin particles tend to harden due to static electricity, etc. when sprayed with a heat insulating material, but by covering the organic foamed resin granules with gypsum, electrostatic charging is prevented and organic foamed resin granules are prevented. The fluidity of can be improved. Furthermore, since the main composition contains a thickener, the fluidity of the organic foamed resin particles in the main composition can also be increased.
2. The organic foamed resin particles themselves are light, but by covering them with gypsum, the weight increases and they are easily mixed in the heat insulating material. Thereby, the organic foamed resin particles are uniformly distributed in the heat insulating material when spraying the heat insulating material. Therefore, the structure in the layer of the heat insulating material after spraying is uniformly formed, and the heat insulating performance can be enhanced. By covering the organic foamed resin particles only with gypsum, it is possible to reduce the cost of the entire heat insulating material and to simplify the work process in the covering process at the time of manufacturing the heat insulating material.
Further, by adding a retarder, the setting time of gypsum or slaked lime and cement is adjusted to prevent rapid hardening of the heat insulating material. Thereby, the spraying workability of the heat insulating material is improved. Furthermore, by combining gypsum or slaked lime, cement, and inorganic fibers, the bond strength can be increased, and the strength and durability of the heat insulating layer can be improved.

It is sectional drawing of the layer formed using the heat insulating material. It is the schematic of the spraying apparatus of a heat insulating material. It is a perspective view which shows the nozzle part of the front-end | tip part of a spray gun. It is a table | surface which shows the performance of a heat insulation layer and a surface layer.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the following description, the same or corresponding elements are denoted by the same reference numerals throughout all the drawings, and redundant description is omitted.
The heat insulating material in the present embodiment is sprayed on an object such as a wall surface or a structure. By spraying on the object, the spraying thickness can be freely adjusted at the construction site according to the heat insulation specification of the object. Further, even for complicated shapes, the heat insulating material layer can be formed continuously without gaps, so that joints and joints do not occur. Further, there is an advantage that a metal fitting such as an insul pin for fixing the heat insulating material layer is not required. The insulation material is sprayed by spraying a slurry-like insulation material at a high pressure with a nozzle (not shown) of a spray gun directed toward an object.

The heat insulating material according to the present embodiment is composed of a composition including a main composition and a sub-composition, and the main composition is made into a slurry form and sprayed onto an object such as a wall surface or a structure together with the sub-composition. It is done. After the spraying, only the slurry-like main composition is sprayed thereon to form a two-stage layer.
FIG. 1 is a cross-sectional view of a layer formed using the heat insulating material according to the present embodiment. On the object 1, there is a heat insulating layer 2 formed by the main composition and the sub-composition, and a surface layer 3 formed on the surface opposite to the object 1 with the heat insulating layer 2 sandwiched by the main composition. Provided. While protecting the heat insulation layer 2 with the surface layer 3, the durability of the heat insulation layer 2 can be improved and the smoothness of the surface can be improved. Since only the heat insulating layer 2 has a low peel strength, the surface layer 3 has an advantage of improving the peel strength. Furthermore, if the surface layer 3 is smooth, there is an advantage that it is difficult to get dirt.

  The heat insulating material is composed of gypsum or slaked lime, cement, retarder, thickener, inorganic aggregate, inorganic fiber, and organic foamed resin particles coated with gypsum on the surface. Composed. Of these, gypsum or slaked lime, cement, retarder, thickener, and inorganic aggregate are the main composition, and inorganic fibers and organic foamed resin particles coated with gypsum on the surface are sub-compositions. A liquid, specifically water, is added to the main composition to form a slurry, and the slurry and the sub-composition of the main composition are separately supplied to a spray gun (described later).

  In the heat insulating layer 2 of FIG. 1, the organic foamed resin particles 20 constituting the sub-composition are shown in a circular shape and have a particle size of 5 mm or less, preferably 1 to 5 mm. The organic foamed resin granules 20 are blended to enhance heat insulation, and can be formed from known materials such as foamed phenol, foamed polyethylene, foamed polypropylene, and foamed polyvinyl chloride in addition to foamed polystyrene (polystyrene foam). The organic foamed resin particles are blended in the range of 11.5 to 13.5% by weight, preferably 12.0 to 12.5% by weight. When the blending amount of the organic foamed resin particles is less than this range, the heat insulating performance as a heat insulating material is insufficient, and when it is large, the nonflammability and the spraying workability are deteriorated. The organic foamed resin particles 20 include not only those formed in the form of beads from the beginning but also those pulverized to a predetermined particle size as recycled products.

The gypsum or slaked lime covering the surface of the organic foamed resin particles 20 is coated with the same blending amount (weight) with respect to the blending amount of the organic foamed resin granules. Therefore, the amount of gypsum or slaked lime covering the organic foamed resin granules 20 is in the range of 11.5 to 13.5% by weight. Gypsum or slaked lime is a mixture of water in a water / solid content ratio of 80 to 100.
As described above, since the organic foamed resin particles are blended in the range of 11.5 to 13.5% by weight, the organic foamed resin particles coated with gypsum on the surface are 23.0 to 27.0% by weight. %.

  The gypsum or slaked lime constituting the main composition is blended to obtain bonding and nonflammability of other blends (ie, cement, aggregate, etc.). Gypsum is blended in the range of 31.0 to 42.5% by weight, preferably 36.0 to 38.0% by weight. If the blending amount is less than this range, the nonflammable effect is small, and if it is large, the heat insulating effect is small. As the gypsum, hemihydrate gypsum can be used. Here, hemihydrate gypsum is synonymous with calcined gypsum, and refers to gypsum that has been heated to lose about 3/4 of crystal water.

  Cement constituting the main composition is intended to improve the bondability of the composition, improve the adhesion of the heat insulating material to the object 1, prevent the heat insulating material from falling after spraying, and improve the durability. Blended. The cement is blended in the range of 7.0 to 9.0% by weight, preferably 7.5 to 8.5% by weight. If the blending amount is less than this range, curing will be poor after spraying the heat insulating material, and if it is greater, the heat insulating effect will be reduced. As the cement, Portland cement is usually used, but alumina cement, ultra-fast cement, expanded cement, acid phosphate cement, silica cement, blast furnace cement, fly ash cement, Keens cement and the like can also be used.

  The retarder constituting the main composition is blended to adjust the setting time of gypsum or slaked lime and cement. The retarder is blended in the range of 0.4 to 0.5% by weight, preferably 0.42 to 0.46% by weight. When the blending amount is less than this range, the time until curing is shortened, so that the workability is lowered, and when it is large, the curing time until curing is prolonged. As the retarder, sodium citrate, citric acid, maleic acid, and tartaric acid can be used.

  The thickener constituting the main composition is blended in order to impart the fluidity of the slurry-like main composition. A thickener is mix | blended in the range of 0.1 to 0.5 weight%, and 0.15 to 0.4 weight% is preferable. If the blending amount is less than this range, the fluidity decreases when spraying the heat insulating material, and even if blending more than this range, the fluidity is not improved. As the thickener, methyl cellulose or acrylic resin can be used.

  Aggregates constituting the main composition are blended in order to obtain weight reduction, incombustibility, and heat insulation, and inorganic lightweight aggregates are preferably used. Aggregates are blended at 4.5 to 5.5 wt%, with 4.75 to 5.25 wt% being preferred. If the blending amount is less than this range, the nonflammability performance and the heat insulation performance are insufficient. As the aggregate, general aggregates having a specific gravity of 0.5 or less, such as mica, pearlite, vermiculite, and lightweight lightweight concrete crushed material can be used.

  The inorganic fibers constituting the sub-composition are blended in order to obtain the bonding property, nonflammability, and heat insulation properties of the blend. The inorganic fiber is blended in the range of 22.5 to 26.5% by weight, and preferably 23.5 to 25.5% by weight. If the blending amount is less than this range, the bonding strength, incombustibility and heat insulation performance are insufficient, and even if blending more than this range, the binding strength is not improved. As the inorganic fiber, rock wool, glass wool, or ceramic wool can be used.

(Insulation spraying device)
FIG. 2 is a schematic view of the heat insulating material spraying device 4. The spraying device 4 includes a main composition supply device 5 that supplies a main composition in a slurry state and a sub-composition supply device 6 that supplies a sub-composition. The main composition supply device 5 includes a stirrer 50 that stirs the main composition and water to form a slurry, a suction hose 51 that is connected to an outlet of the stirrer 50, and the suction hose 51 that is connected to the slurry main body 50. A slurry pump 52 for outputting the composition and a slurry hose 53 extending from the outlet of the slurry pump 52 are provided.
The auxiliary composition supply device 6 includes a roots-type blower 60 that outputs compressed air, a connection hose 61 connected to the outlet of the blower 60, and compressed air is supplied via the connection hose 61, and the auxiliary composition is carried in. And a supply hose 63 extending from the outlet of the sprayer 62.
The tips of the slurry hose 53 and the supply hose 63 are connected to the spray gun 7 directed to the object 1.

  FIG. 3 is a perspective view showing the nozzle portion at the tip of the spray gun 7. The spray gun 7 includes an annular nozzle body 70, which has a first opening 71 at the center, and a plurality of second openings 72 formed in the circumferential direction around the first opening 71. The first opening 71 is connected to the supply hose 63, and the plurality of second openings 72 are connected to each other and the slurry hose 53. Accordingly, the sub-composition is discharged from the first opening 71, the slurry-like main composition is discharged from the plurality of second openings 72, and both compositions are mixed and sprayed as a heat insulating material.

  When spraying the heat insulating material, the main composition and water are carried into the stirrer 50, and the sub-composition is carried into the blowing machine 62. Next, the stirrer 50 and the slurry pump 52 of the main composition supply device 5 and the blower 60 and the spraying device 62 of the sub composition supply device 6 are operated. The main composition made into a slurry by the stirrer 50 is sent to the spray gun 7 through the slurry hose 53, and the sub-composition is sent to the spray gun 7 through the supply hose 63. The slurry-like main composition has a solid content / water weight ratio in the range of 80 to 100, preferably 80 to 90. If this ratio is less than this range, water repellency occurs on the surface after spraying, and if it is greater, the slurry cannot be discharged properly. The sub-composition discharged from the first opening 71 and the slurry-like main composition discharged from the second opening 72 are mixed and sprayed onto the object 1.

  The sub-composition and the main composition are sprayed as a heat insulating material that is a slurry-like mixture, whereby the heat insulating layer 2 is formed on the object 1. The slurry concentration of this mixture is in the range of 50.6-63.3 by weight ratio of solids / water, preferably in the range of 50.6-56.2. If the slurry concentration is less than this range, so-called water dripping occurs after spraying the heat insulating material. Although the heat insulating material which is a slurry-like mixture varies depending on the blending amount of each blend, the specific gravity is in the range of 0.05 to 0.15. Therefore, the formed heat insulating layer 2 is light and has a small burden on the object 1 and has an excellent heat insulating effect.

After the heat insulation layer 2 is formed, the blower 60 and the sprayer 62 of the sub-composition supply device 6 are stopped, and only the stirrer 50 and the slurry pump 52 of the main composition supply device 5 are operated. Only the slurry-like main composition is sprayed from the spray gun 7 onto the surface of the heat insulating layer 2 to form the surface layer 3. In order to form the surface layer 3, the slurry-like main composition may be sprayed as it is from the main composition supply device 5, so that it is not necessary to prepare a separate composition for the surface layer 3. That is, the spraying workability is good.
By forming the surface layer 3 on the heat insulation layer 2 on the side opposite to the object 1, the heat insulation layer 2 is protected and durability can be improved. Further, as described above, by forming the surface layer 3, it is possible to improve the smoothness of the surface and to obtain advantages such as being less likely to get dirty.

  The thickness of the heat insulating layer 2 may be appropriately selected depending on the required performance, but is preferably about 10 to 150 mm. When the thickness of the heat insulating layer 2 is thinner than 10 mm, the effect as a heat insulating material is weakened, and when it is thicker than 150 mm, the heat insulating effect sufficient to meet the cost increase accompanying the spraying of the heat insulating material is weakened. The thickness of the surface layer 3 is preferably about 2 mm, and the range is preferably about 1.8 to 2.2 mm.

(Effect of this embodiment)
The heat insulating material according to the present embodiment and the heat insulating layer and the surface layer formed by the heat insulating material have the following technical effects.
(1) The heat insulating material is blended with organic foamed resin particles whose surfaces are coated with gypsum. Synthetic foamed resin enhances heat insulation, and gypsum imparts flame retardancy. By covering the organic foamed resin particles with gypsum, a heat insulating material with excellent heat insulation and flame retardancy (nonflammability) is obtained. I can do it.
In addition, organic foamed resin particles tend to harden due to static electricity, etc. when sprayed with a heat insulating material, but by covering the organic foamed resin granules with gypsum, electrostatic charging is prevented and organic foamed resin granules are prevented. The fluidity of can be improved. Further, the spraying workability (constructability) of the heat insulating material is improved, and the structure in the layer of the heat insulating material after spraying is uniformly formed, whereby the durability and heat insulating performance of the layer of the heat insulating material are also improved. Furthermore, since the main composition contains a thickener, the fluidity of the organic foamed resin particles in the main composition can also be increased.
(2) Although the organic foamed resin granules themselves are light, the organic foamed resin granules increase in weight when coated with gypsum, and the organic foamed resin granules are uniformly distributed in the heat insulating material when spraying the heat insulating material. Therefore, the structure in the layer of the heat insulating material after spraying is uniformly formed, and the heat insulating performance can be enhanced. By covering the organic foamed resin particles only with gypsum, it is possible to reduce the cost of the entire heat insulating material and to simplify the work process in the covering process at the time of manufacturing the heat insulating material. Further, since the organic foamed resin particles are uniformly distributed in the heat insulating material when spraying the heat insulating material, the organic foamed resin particles scattered during the spraying are reduced (this is referred to as reducing the raw material loss rate). .
Since fewer organic foamed resin particles are scattered when sprayed, adverse effects on the environment of the spraying work site are prevented, and cleanliness can be maintained.
(3) A spraying method of a heat insulating material containing a slurry-like composition and a dried composition is called a semi-dry method, and in such a semi-dry method, an organic foamed resin coated with a slurry-like main composition and gypsum Since it sprays, mixing the subcomposition containing a granule, uniform spraying can be performed.
(4) By adding a retarder to the main composition, the curing time of gypsum or slaked lime and cement is adjusted to prevent rapid curing of the heat insulating material. Thereby, the spraying workability of the heat insulating material is improved. Furthermore, the bond strength is increased by mixing gypsum or slaked lime, cement, and inorganic fibers, and the strength and durability of the heat insulating layer 2 can be improved. In addition to gypsum or slaked lime and cement in the main composition, inorganic aggregates are blended, and inorganic fibers are blended in the sub-composition. The heat insulating layer 2 and the surface layer 3 having excellent adhesion and durability can be obtained.
(5) In order to form the surface layer 3 on the heat insulating layer 2, the slurry-like main composition may be sprayed as it is, so that it is not necessary to prepare a separate composition for the surface layer 3. That is, the spraying workability is good.

(Examples of heat insulation layer and surface layer)
In order to confirm the effect of the heat insulating material, specifically, to confirm the effect of the organic foamed resin particles coated with gypsum, the applicant uses the main composition and the sub-composition according to the present embodiment to insulate the heat. A layer and a surface layer were formed, and performance experiments such as sprayability and nonflammability were conducted. Here, mica is used as the inorganic aggregate of the main composition, sodium citrate is used as the retarder, methylcellulose is used as the thickener, and the liquid used to make the main composition into a slurry is water. The organic foamed resin particles coated with gypsum as a sub-composition are polystyrene particles. The object to which the heat insulating material is sprayed is a cement board having a thickness of 100 mm. The surface layer has a thickness of 2 mm.

The experimental results of the five Examples 1 to 5 and the comparative example are shown as a table in FIG. In FIG. 4, except for the ratio, all the compounding amounts are shown in wt%. In FIG. 4, Examples 1 to 5 differ from each other in the weight percent of polystyrene particles coated with gypsum as a sub-composition, and the weight percents of mica, sodium citrate, and methylcellulose are the same. Moreover, the comparative example uses the heat insulating material which contained the granular material of the polystyrene foam which does not coat | cover the surface with gypsum as a subcomposition. Therefore, the foamed polystyrene of the comparative example is predicted to have poor fluidity as compared with the foamed polystyrene of Examples 1-5.
In the experiment, the surface layer is formed on the heat insulating layer. However, as described above, the surface layer is formed of the main composition, and thus does not include the polystyrene particles. Therefore, in order to confirm the effect of the organic foamed resin particles coated with gypsum, the presence or absence of the surface layer is considered to be irrelevant.

  In the table of FIG. 4, the sprayability is determined by the raw material loss rate which is the ratio of the organic foamed resin particles that are scattered when the heat insulating material is sprayed. The case where the raw material loss rate was 10% or less was evaluated as “B” and the case where it exceeded 10% was evaluated as “C”. As for the sprayed state, after spraying the heat insulating material, the uniformity of the organic foamed resin particles was visually observed, and the case where it was sprayed uniformly was marked with ◯, and the case where it was not sprayed uniformly was marked with ×.

The incombustibility was determined by the technical standards of the Building Standards Law Enforcement Ordinance, and the performance of fire prevention materials according to the approval of the Minister of Land, Infrastructure, Transport and Tourism was evaluated. In the case of satisfying the criteria of quasi-incombustibility or better, it was marked as ◯, and in the case of not satisfying the criterion, it was marked as x. Specifically, the total calorific value is 7.2 MJ / m ² or less in a corn calorimeter exothermic test after 10 minutes of heating, and penetrates to the back side, which is harmful to fire prevention, from the start of heating to the end of the test. It depends on whether or not there is no crack or hole to be satisfied, and whether the maximum heat generation rate continues for 10 seconds or more and does not exceed 200 kW / m ² from the start of heating to the end of the test.
Regarding heat insulation, the standard of general heat insulating materials is that the thermal conductivity is 0.044 W / m · K or less, so the case where the thermal conductivity is 0.044 W / m · K or less is better than this, The case was marked with x.

From the table | surface of FIG. 4, Examples 1-5 and the sprayability of a comparative example, a spraying state, a nonflammability, and heat insulation are compared. In terms of nonflammability and heat insulation performance, * 1 was determined to be x because it was judged that the performance was different depending on the location where the specimen was taken because the spraying state was uneven.
From this table, the heat insulation layer formed by using a heat insulating material containing polystyrene foam particles coated with gypsum on the surface was formed using a heat insulating material containing polystyrene foam particles not coated with gypsum on the surface. It can be seen that the results are superior to those of the heat insulation layer. That is, the technical effect of the heat insulating material of the present embodiment was demonstrated.

  As described above, the heat insulating material according to this embodiment includes a main composition and a sub-composition. Thus, the main composition and sub-composition may be sold together or sold separately.

  The present invention is useful when used in a heat insulating material sprayed on a wall surface or a structure and a method of constructing the heat insulating material.

DESCRIPTION OF SYMBOLS 1 Target object 2 Heat insulation layer 3 Surface layer 20 Organic foaming resin particle

Claims (7)

A spray insulation used to form a thermal insulation layer on an object,
It has a main composition comprising gypsum or slaked lime, cement, a retarder, a thickener and an inorganic aggregate, and a sub-composition comprising inorganic fibers and organic foamed resin granules coated with gypsum on the surface. And
The spraying heat insulating material used in order to mix | blend the said main composition and the said subcomposition, and to form the said heat insulation layer.   The spray heat insulating material according to claim 1, wherein the main composition is formed into a slurry by adding a liquid and sprayed onto the object together with the sub-composition to form the heat insulating layer. .   The spraying heat insulating material according to claim 1 or 2, wherein the organic foamed resin particles are covered with gypsum or slaked lime having a blending amount of the same weight% as the blending amount of the organic foamed resin particles.   The main composition comprises 31.0 to 42.5% by weight plaster or slaked lime, 7.0 to 9.0% by weight cement, 0.4 to 0.5% by weight retarder, 0.1 to 0 The spray insulation according to any one of claims 1 to 3, comprising 0.5 wt% of a thickener, 4.5 to 5.5 wt% of an inorganic aggregate.   The sub-composition comprises 22.5 to 26.5% by weight of inorganic fibers and 23.0 to 27.0% by weight of organic foamed resin particles coated with gypsum on the surface. A spray insulation material according to any one of the above. A main composition comprising gypsum or slaked lime, cement, retarder, thickener, and inorganic aggregate, and a sub-composition comprising inorganic fibers and organic foamed resin particles coated with gypsum on the surface were blended. Preparing a composition;
Adding a liquid to the main composition to obtain a slurry-like main composition;
Mixing the slurry-like main composition and the sub-composition and spraying the object to form an insulating layer;
The construction method of a heat insulating material which has the process of spraying further the slurry-like main composition on the formed heat insulation layer, and forming a surface layer on the said heat insulation layer.   The slurry-like main composition has a solid content / liquid weight ratio of 80.0 to 100.0, and the mixed slurry-like main composition and the sub-composition have a solid content / liquid weight ratio. The construction method of the heat insulating material according to claim 6, wherein is 50.6 to 63.3.

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