JP3285470B2 - Lightweight non-combustible heat insulating material composition excellent in pumping property and method of applying the same - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lightweight noncombustible heat insulating material composition for forming a heat insulating layer on a site to be provided with heat insulating properties in the field of civil engineering and construction, and a method for constructing the same.

[0002]

2. Description of the Related Art Conventionally, a general heat insulating material is required to form as many bubble structures as possible within the heat insulating material in order to exhibit its heat insulating effect. In particular, in the case of thermal insulation materials that are sprayed on site, the formation of such an internal cell structure, such as urethane foam and some foam mortar,
A method based on a foaming reaction during the formation of a heat insulating material, or
It has been formed by a method in which a light-weight powder having a cellular structure, such as a light-weight mortar mixed with an inorganic light-weight powder such as perlite or vermiculite, is mixed with a hydraulic base-forming substance such as cement and applied. However, when using the foaming reaction, there is a disadvantage that the stability of the reaction is greatly affected by the construction environment, while, in the case of a method of mixing a large amount of lightweight powder with the parent substance, Generally, these lightweight powders have low strength by themselves, and may be crushed by the force during mixing, or when pumping and spraying, the pump pressure and shear stress during hose transfer at that time As a result, the lightweight powder and the like are crushed by the spraying pressure and the like, and as a result, the bulk specific gravity of the final product is increased, which causes a decrease in heat insulation and an increase in specific gravity. Such a tendency becomes conspicuous as the weight of the light-granular material is increased in order to further reduce the weight of the heat insulating material. In contrast, organic foamed lightweight particles such as expanded polystyrene, which are relatively elastic and hard to break, ultrafine hollow organic foams, or hollow bodies having relatively large bulk specific gravity due to their strength in inorganic systems In addition, there has been a method of increasing the strength of the heat insulating material by adding a synthetic resin or a dispersion thereof to a matrix-forming substance. On the other hand, in addition to such a requirement for light weight, it is greatly desired to provide non-combustible performance for fire prevention and disaster prevention. In construction and civil engineering sites where insulation materials are installed, it is usual to perform other operations simultaneously and in parallel with the installation of the heat insulation materials. It can happen. In such a case, if the heat insulating material is flammable, it will lead to a fire accident. Further, at present, such materials as a self-extinguishing heat insulating material that temporarily ignites or generates a harmful gas due to a rise in temperature are used even if a fire does not occur. Such flammable or self-extinguishing insulation materials often contain a relatively large amount of organic flammable components in the composition, and reducing such organic flammable components may cause fire or harm. This leads to prevention of gas generation.

[0003]

However, in order to improve the strength of organic foamed light-weight powders such as the above-mentioned crushed expanded polystyrene and the like, which are introduced for the purpose of maintaining lightweight heat-insulating properties, and the strength of the whole heat-insulating material. Synthetic resins and their dispersions are flammable materials and should be reduced as much as possible for fire and disaster prevention, but reducing them will not solve the problem of securing lightweight insulation during construction. . Therefore, the first problem to be solved by the present invention is to reduce such organic combustible components as much as possible,
An object of the present invention is to obtain an inorganic light-weight heat insulating material forming material which retains nonflammability. Further, in construction and civil engineering sites, it is usual to pump the heat-insulating material at the site, but in the case of a heat-insulating material containing a large amount of lightweight granules, the pressure at the time of the pumping is used. Similarly, when a phenomenon occurs in which the light-weight powder particles are crushed, the material sprayed from the nozzle at the tip of the pressure-feeding hose to the surface to be coated has a very low viscosity and droops, so that it can be secured at one time. There is a problem that the thickness of the applied coating is limited. Therefore, the second problem to be solved by the present invention is that a heat insulating material forming material of a type in which a small amount of inorganic lightweight powder having a low bulk specific gravity is mixed in a large amount with a hydraulic mother material, while pumping and spraying. It is an object of the present invention to obtain a light-weight heat insulating material forming material which is hard to crush, contains a small amount of viscosity change of the material at the time of spraying, and is hard to hang down.

[0004]

Means for Solving the Problems In order to solve such problems, the present inventors have made intensive studies and as a result, in order to reduce organic flammable components, an inorganic foamed lightweight body was used as a lightweight powder. It has been found that the inorganic lightweight foam is not crushed at the time of mixing and pumping, and that the problem of viscosity reduction due to separation of water can be solved by using and further combining specific components. That is, the present invention provides: 100 parts by weight of hydraulic cement and / or gypsum,
Bulk specific gravity 0.05-0.15, average particle size 50-1000
20 to 200 parts by weight of an inorganic lightweight aggregate having a particle size of 20: 8
Viscosity modifier 0.5-80: 20 blended at a ratio of 0.5-
A lightweight noncombustible heat insulating composition having excellent pumpability, comprising 7 parts by weight, 2 to 20 parts by weight of pulp, and 2 to 20 parts by weight of a synthetic resin emulsion in terms of solid content. 2.1. And kneading by further adding water to the composition according to the above, followed by pumping, spraying on a portion to be provided with heat insulating properties, and drying to form a heat insulating layer having a bulk specific gravity of 0.15 to 0.35. A method for constructing a lightweight non-combustible heat insulating material composition having excellent pumping properties, characterized by: 3. 1. Water was further added to the composition described in 1 above, and a cone viscometer having a tip angle of 30 ° and a weight of 150 g was measured at 40 to 70.
A lightweight non-combustible heat insulating material composition excellent in pumpability, characterized in that it is adjusted to a kneaded material having a viscosity of settling mm. 4.3. Is pump-pumped, sprayed on a portion to be provided with heat insulation, dried, and has a bulk specific gravity of 0.15 to 0.1.
35. A method for applying a lightweight noncombustible heat insulating material composition having excellent pumpability, comprising forming 35 heat insulating layers. 5. The inorganic lightweight aggregate is a Shirasu balloon
1. Or 3. Light with excellent pumpability described in
Incombustible insulation composition. 6. The inorganic lightweight aggregate is a Shirasu balloon
2. Or 4. Light with excellent pumpability described in
How to apply the non-combustible insulation composition. Is included. Hydraulic cement and / or gypsum used in the present invention include portland cement, alumina cement, lime mixed cement, blast furnace cement, silica cement, fly ash cement, masonry cement, high sulfate slag cement, gypsum and other hydration reactions. Materials that are cured by heat. For inorganic lightweight aggregate, bulk specific gravity is 0.05
And 0.15 to 0.15, more preferably 0.05 to 0.10, for the purpose of the present invention of high weight and weight and high heat insulation. The average particle size of these lightweight aggregates is 50-1000 μm
It is. If the bulk specific gravity is less than 0.05, the sprayed material tends to hang and it is difficult to thicken the material. In addition, cracks are likely to occur in the formed heat insulating material layer. If it is larger than 0.15, it is strong against crushing at the time of handling, but it is difficult to reduce the weight and weight, which deviates from the present invention of forming a high heat insulating material. This inorganic lightweight aggregate is used in an amount of 20 to 200 parts by weight, preferably 50 to 150 parts by weight, for the purpose of weight reduction and strength, based on 100 parts by weight of cement. If the amount is less than 20 parts by weight, both the heat insulating effect and the light weight effect will be insufficient. On the other hand, if the amount is more than 200 parts by weight, the strength of the formed heat insulating material becomes extremely weak. Next, there are no particular restrictions on the viscosity of methylcellulose and ethylhydroxyethylcellulose as long as they are commonly used.
0: 80-80: 20. When the amount of methylcellulose is increased beyond this range, the inorganic lightweight aggregate is crushed, and when the amount of ethylhydroxyethylcellulose is increased beyond this range, the viscosity is reduced during pumping or the strength of the formed heat insulating material is reduced. Will decrease. The viscosity modifier consisting of both of them is cement 1
0.5 to 7 parts by weight, preferably 1 to 100 parts by weight
-5 parts by weight. At this time, if the amount is less than 0.5 part by weight, the inorganic lightweight powder particles are easily crushed during kneading, and
Water separation is likely to occur during pumping, making it impossible to pump properly. When the amount is more than 7 parts by weight, the viscosity of the kneaded material becomes strong, and the pumping property tends to be impaired. In addition, since these are organic combustible components, the non-combustibility of the formed heat insulating material is impaired. Next, pulp is obtained by mechanically or chemically treating plant raw materials to extract the cellulose fiber.Wood is most often used as the raw material, but in particular, it is not limited to the type of starting material Absent. In addition, recycled pulp, recycled pulp, or mixed pulp can also be used. It can be used either in a state of being dispersed in water or in a dried form. For example, when used as a dry mix in the form of powder, it is dried in advance and its fiber length is about 3 mm or less. Is preferable in terms of uniformly dispersing and drying with other powders and granules, and in particular, those having passed a mesh having an opening of 1 mm are preferable. When pulp dispersed in water or wet pulp is used, it can be used by dispersing it together with kneading water. In that respect, the fiber length is not limited to the above. Pulp is based on 100 parts by weight of cement.
It is 2 to 20 parts by weight, preferably 2 to 10 parts by weight. 2
When the amount is less than the weight part, the material is crushed at the time of pumping and the bulk specific gravity becomes high, and when sprayed, the viscosity is greatly reduced and it is easy to hang down, so that it is difficult to spray a certain thickness.
If the amount is more than 20 parts by weight, those problems are solved, but the non-combustibility of the formed heat insulating material cannot be ensured. Next, as the synthetic resin emulsion, an aqueous dispersion type such as an acrylic ester type, a versatic acid ester type, a styrene type, a vinyl chloride type, a vinyl acetate type, and an SBR type, or a powder type can be used. In particular, a re-emulsifiable powder type is preferable, in which a single powder material is mixed with water at the site, since work efficiency at the site is better. The synthetic resin emulsion is used in an amount of 2 to 20 parts by weight, preferably 4 to 15 parts by weight in terms of solid content, based on 100 parts by weight of cement. 2
If the amount is less than the weight part, the adhesion of the formed heat insulating material to the substrate becomes insufficient, and if the amount is more than 20 parts by weight, the non-combustibility of the formed heat insulating material is impaired. At the time of actual installation of heat insulating material, after further mixing water with each of the above components and kneading them once, the kneaded material is pumped with a pump to fill gaps, or a spray nozzle is set at the tip. And is sprayed onto the application target site together with the compressed air. Although the mixing ratio of water varies depending on the ratio of each of the above components, it is desirable that the kneaded material has a tip at a tip angle of 30 ° and a horizontally leveled kneaded material surface using a cone viscometer with a weight of 150 g. The sinking distance is 40-70m when it falls naturally
It suffices if the viscosity is such that it becomes m. By pumping such a kneaded product and spray-drying and curing it on a portion to which heat insulation is to be imparted, it is lightweight with a bulk specific gravity of 0.15 to 0.35 and a thermal conductivity of 0.10 kcal / mhr ° C or less. An excellent heat insulating material layer can be formed. Furthermore, the lightweight heat-insulating material layer thus formed has a thickness of 5 mm when subjected to a surface heating test, for example, in accordance with a test method specified as non-combustible equivalent to the base material as a criterion for evaluating the fire prevention performance of the sprayed material. It was confirmed that the exhaust temperature of the specimen and the smoke generation coefficient satisfied nonflammability, and did not impair the fire prevention performance.

[0005]

In the composition of the present invention, while containing a large amount of inorganic lightweight powder, kneading and pumping can be performed and the change in bulk specific gravity due to viscosity and crushing is minimized. This is probably due to the specific viscosity resulting from the combination of ethylhydroxyethylcellulose, the water retention of the pulp and the tangling due to the unique shape of the pulp fibers. In addition, as a result of such an action, it is possible to mix a large amount of inorganic lightweight powders as never before, and while containing an organic flammable component in combination with cement, while maintaining the fireproof performance of nonflammability, Also, it is considered that high heat insulation performance could be imparted by maintaining lightness even after spraying construction.

[0006]

【Example】

(Example 1) For 10 kg of Portland cement,
15 kg (volume: 115 liters) of expanded pearlite having a bulk specific gravity of 0.13 and an average particle size of 850 μm, a 2% dissolution viscosity of 1
5000 mPa · s methylcellulose powder was added to 0.15
kg, 0.08 kg of ethyl hydroxyethyl cellulose powder having a 1% dissolution viscosity of 13000 mPa · s, and a fiber length of 3
1.5 kg of recycled pulp fibers having a diameter of not more than 1 mm were put into a V-type blender and mixed for 5 minutes to obtain a substantially uniform mixed lightweight powder. This powder was put into a bread-type mortar mixer, and styrene-butadiene resin emulsion (solid content concentration: 45%) 0.6 kg (solid content: 0.27 k)
g) and 35.0 kg of water were added and kneaded for 3 minutes to obtain a lightweight kneaded product having a cone viscosity of 60 mm. A part of this material is taken and a cup-type hand-blown gun for building painting (tip diameter 10 mm, air pressure 490 k
The sprayed material was sprayed on the vertical wall surface at Pa), and the sprayed material was sampled and its specific gravity was measured to be 0.69. On the other hand, the above-mentioned kneaded mixture was put into a hopper of a snake-type pressure-feeding pump, pressure-fed with a hose having an inner diameter of 25 mm and a length of 30 m, mixed with air at the tip and sprayed on a wall surface. It was possible. Also,
The material sprayed and blown was sampled, and its specific gravity was measured. The result showed a value of 0.72, indicating that the material with almost the same specific gravity as that of the material not pumped was installed. confirmed. Further, after the kneaded material sprayed on the wall surface was dried and cured for 28 days, the formed heat insulating material layer was cut off, and the specific gravity after drying for 48 hours in a dryer at 50 ° C. was 0.34. Was. 25 ° C
Measured its thermal conductivity at 0.079 kc
al / m hr ° C. In order to confirm the fire prevention performance of the heat insulating layer formed from the kneaded material, 220 × 220 × 1
On a pearlite plate of 0 mm, the kneaded material was dried to a thickness of 5 mm.
And dried and cured for 28 days to produce a test plate. Using this test plate, a heating test was performed in accordance with JIS A 1321 "Method of testing flame retardancy of interior materials and construction methods of buildings 3. Surface test". As a result, during the heating for 10 minutes, the exhaust temperature curve does not exceed the standard temperature curve, the smoke emission coefficient per unit area becomes 30 or less,
There was no after-flame for 30 seconds or more after the heating was completed. That is, noncombustible performance equivalent to the base material was confirmed. (Test method) ・ Measurement of cone viscosity of kneaded material Based on the formulation example, except for synthetic resin emulsion and water,
The mixture was put into a V-type blender and mixed for 5 minutes to obtain a substantially uniform mixed lightweight powder. This powder was put into a pan-type mortar mixer, and kneaded for 3 minutes while adding a synthetic resin emulsion and water thereto. Using a conical viscometer with a tip angle of 30 ° and a weight of 150 g, the tip is placed on the surface of the kneaded material that has been leveled horizontally and the sedimentation distance is measured in mm when the tip is allowed to fall naturally. -Specific gravity of the spray-kneaded material (after spraying the cup-type hand-blown gun) Using a cup-type hand-blown gun, collect the material sprayed on the wall and measure the specific gravity. -Specific gravity of the sprayed kneaded material (after pumping and blowing) The kneaded material is put into the hopper of a snake-type pumping pump, is pressure-fed with a hose having an inner diameter of 25 mm and a length of 30 m, mixes air at the tip and sprays it on the wall After that, the material sprayed on the wall is collected and its specific gravity is measured.・ Thickness that can be sprayed
m, air pressure of 490 kPa) and continuously sprayed on the vertical wall surface, and the sprayed thickness in a range where sagging does not occur on the kneaded material is measured.・ Dry specific gravity After kneading with the pump, 28
After drying and curing for days, cut off the formed insulation layer,
The dry specific gravity after leaving to stand in a dryer at 50 ° C. for 48 hours was measured. -Thermal conductivity The thermal conductivity at 25 ° C was measured. (Unsteady heating method using QTM-D3 manufactured by Kyoto Denshi Kogyo Co., Ltd.)-Fire performance test To confirm the fire protection performance of the heat insulating layer formed from the kneaded material, a 220 x 220 x 10 mm pearlite plate was used. Is sprayed to a dry film thickness of 5 mm.
A test plate was prepared by drying and curing for 8 days. Using this test plate, a heating test was performed in accordance with JIS A 1321 "Method of testing flame retardancy of interior materials and construction methods of buildings 3. Surface test".
At this time, during the heating for 10 minutes, the exhaust temperature curve does not exceed the standard temperature curve, the smoke emission coefficient per unit area becomes 30 or less, and there is no residual flame for 30 seconds or more after the heating is completed. Was satisfied when the performance was satisfied, and x otherwise. However, when the dry specific gravity of the heat insulating material layer formed on the wall surface was larger than 0.35, the fire prevention performance test was not performed. (Examples 2 to 6) In the same manner as in Example 1, kneaded materials were manufactured based on the formulations shown in Table 2, and the above-described tests were performed. The results are shown in Table 4. As is clear from the results, the kneaded products manufactured in these examples can be sprayed with a spray thickness of 20 mm or more, and even after spraying by pumping, the kneaded material is almost incomparable with the material without pumping. It was confirmed that a concrete with the same level of specific gravity was installed. In addition, the dry specific gravity was 0.35 or less, which is a very small value as an inorganic lightweight heat insulating material, that is, a very lightweight heat insulating layer was formed. In addition, all of the heat insulating material layers formed from the kneaded materials had the same nonflammable performance as the base material. (Comparative Example 1) In the same manner as in Example 1, kneaded materials were manufactured based on the formulations shown in Table 3, and the above-mentioned tests were performed. Table 5 shows the results. Due to the absence of pulp, the specific gravity after pumping and spraying became extremely large as compared with the material without pumping, resulting in an increase in thermal conductivity. Also, the sprayable thickness was only 7 mm. (Comparative Example 2) In the same manner as in Example 1, kneaded materials were manufactured based on the formulations shown in Table 3, respectively, and the above-mentioned tests were performed. Table 5 shows the results. Since there is no blending of ethyl hydroxyethyl cellulose, the specific gravity of the kneaded material increases during the production of the kneaded material, so that the specific gravity of both the material not pumped and the material pumped becomes extremely large, resulting in a thermal conductivity. Has become larger. Also,
The sprayable thickness remained at 10 mm. (Comparative Example 3) In the same manner as in Example 1, kneaded materials were manufactured based on the formulations shown in Table 3, and the above-mentioned tests were performed. Table 5 shows the results. The produced kneaded material was very light, but had a foam containing a large amount of air bubbles, and could not be pumped by a pump. (Comparative Example 4) In the same manner as in Example 1, kneaded materials were manufactured based on the formulations shown in Table 3, and the above-mentioned tests were performed. Table 5 shows the results. Since pearlite having a large bulk specific gravity was used, the formed heat insulating layer had a large dry specific gravity, and thus had a high thermal conductivity. Also, the sprayable thickness remained at 6 mm. (Comparative Example 5) In the same manner as in Example 1, kneaded materials were produced based on the formulations shown in Table 3, and the above-mentioned tests were performed. Table 5 shows the results. Since the synthetic resin emulsion was blended more than specified in the present invention, the sprayable thickness was 30 mm.
However, the fire prevention performance did not meet the criteria of noncombustibility equivalent to the base material.

[Table 1]

[Table 2]

[Table 3]

[Table 4]

[Table 5]

[0007]

The effect of the present invention is that since the organic flammable components in the composition of the present invention are reduced as much as possible, a heat insulating layer having a performance satisfying the nonflammability can be formed. Further, at the construction site, even when the composition of the present invention is added to the composition of the present invention, the mixture is kneaded with a mortar mixer, and pumped, the pressure at the time of pumping does not crush the light and granular material. The material sprayed on the application surface
Even if a thick blow of several tens of mm is used, no dripping occurs. As a result, a very lightweight non-combustible heat-insulating layer having a bulk specific gravity of 0.15 to 0.35 and a very excellent heat insulating property can be formed.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI C04B 24/38 C04B 24/38 D 28/00 28/00 E04B 1/76 E04B 1/76 E // C04B 103: 44 C04B 103 : 44 111: 40 111: 40 (58) Fields investigated (Int. Cl. ⁷ , DB name) C04B 2/00-32/02 E04B 1/76

Claims (6)

(57) [Claims] 1. Hydraulic cement and / or gypsum 1
1. 00 parts by weight, Bulk specific gravity 0.05 to 0.15, average particle size 50 to 10
2. 20 to 200 parts by weight of a 00 μm inorganic lightweight aggregate; 3. 0.5 to 7 parts by weight of a viscosity modifier in which methylcellulose and ethylhydroxyethylcellulose are blended in a ratio of 20:80 to 80:20. 4. 2 to 20 parts by weight of pulp; A lightweight non-combustible heat insulating composition having excellent pumpability, comprising 2 to 20 parts by weight of a synthetic resin emulsion in terms of solid content. 2. The composition according to claim 1, wherein water is further added and kneaded, followed by pumping, spraying on a portion to be provided with heat insulation, drying, and bulk specific gravity of 0.15 to 0.1. 35. A method for applying a lightweight noncombustible heat insulating material composition having excellent pumpability, comprising forming 35 heat insulating layers. 3. The composition according to claim 1, wherein water is further added to adjust a kneaded product having a cone angle viscometer with a tip angle of 30 ° and a weight of 150 g to sink 40 to 70 mm. A lightweight non-combustible heat insulating material composition having excellent pumpability. 4. Pumping the composition according to claim 3;
A method for applying a lightweight non-combustible heat insulating material composition having excellent pumping properties, wherein a heat insulating layer having a bulk specific gravity of 0.15 to 0.35 is formed by spraying and drying a portion to be provided with heat insulating properties. 5. The inorganic lightweight aggregate is a shirasu balloon.
The pump according to claim 1 or 3, characterized in that:
Lightweight non-combustible heat insulating composition with excellent pumpability. 6. The inorganic lightweight aggregate is a shirasu balloon.
The pump according to claim 2 or 4, wherein
Construction method of lightweight non-combustible insulation material composition with excellent pumpability.