JPH046183A - Heat insulating material and structure formed by using this heat insulating material - Google Patents

Abstract

PURPOSE:To obtain the heat insulating performance approximate to the heat insulating performance of org. heat insulating materials, the flame retardance equiv. to the flame retardance of inorg. heat insulating materials and the strength higher than heretofore by compounding a synthetic resin emulsion, org. microballoons and carbon fibers at specific ratios with cement. CONSTITUTION:This heat insulating material is formed by compounding 3 to 50 pt. wt. (in terms of solid content) synthetic resin emulsion, 1 to 20 pts. wt. org. microballoons and 0.3 to 5 pts. wt. carbon fibers with 100 pts. wt. cement. This heat insulating material can be applied to a wet process as well in addition to a dry process involving the use of this material in the form of a molded plate.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a heat insulating material and the use of this heat insulating material [Prior Art] Conventionally, inorganic heat insulating materials for buildings include foamed mortar, perlite, etc. Insulating materials such as mortar with a cement matrix are mainly used.

Such foamed mortar, pearlite mortar, and the like may be applied in a dry manner as a heat insulating molded board, in addition to wet construction such as spraying or troweling.

[Problem to be solved by the invention]

Insulating materials such as foamed mortar and pearlite mortar are inorganic insulating materials, and because they have cement as a matrix, they are difficult to burn and can be expected to have a certain degree of strength, but they have a thermal conductivity of 0. 2-0.
3 (kcal/mhr 'C), and the thermal conductivity of organic insulation materials such as Stylowa Ohm 1 foamed urethane is 0.02.
0.03 (kcal/mhr"c), which is very large compared to 0.03 (kcal/mhr"c), and there was a problem that the heat insulation performance was poor.

For this reason, it is not only difficult to secure the desired heat insulation performance, but also a considerable thickness is required to ensure that performance.

On the other hand, organic insulation materials such as urethane foam and styrofoam that are installed on-site have a thermal conductivity of 0.02 to 0.03 (
kcal/mhr''C), which is very small, and exhibits excellent heat insulation performance, but because it is organic, it has the problem of being easily flammable.

For this reason, due to legal restrictions and strength issues regarding fire prevention, it is necessary, for example, to attach a flame-retardant material such as gypsum board on top of the organic insulation material and use this as a base for a decorative finish. However, in order to provide a building with an insulating structure, there are many construction steps and it takes time and effort.

The present invention was made to solve the above-mentioned problems, and it can be used for wet construction in addition to dry construction for use as a molded board, and has a heat insulation performance close to that of organic insulation materials. In addition, from the viewpoint of flame retardancy, it is an object of the present invention to provide a heat insulating material that has the performance of conventional inorganic heat insulating materials and is characterized by higher strength than conventional ones, and a structure using this heat insulating material. With the goal.

[Means for Solving the Problem] The heat insulating material according to claim 1 contains 3 to 50 parts by weight of a synthetic resin emulsion in terms of solid content, 1 to 20 parts by weight of organic microballoons, and carbon, based on 100 parts by weight of cement. Fiber 0
．． 3 to 5 parts by weight.

Here, the solid content of the synthetic resin emulsion is set at 3 to 50 parts by weight based on 100 parts by weight of cement, because if it is less than 3 parts by weight, the adhesion performance will decrease, and if it is more than 50 parts by weight, the fire resistance will decrease. This is because the cost will be high.

In addition, the reason why organic microballoons should be 1 to 20 parts by weight per 100 parts by weight of cement is that if it is less than 1 part by weight, the insulation performance will decrease, and if it is more than 20 parts by weight, the fire resistance and strength will decrease, but the cost will increase. Because it will be.

Furthermore, 0.3 parts of carbon fiber per 100 parts by weight of cement.
~5 parts by weight is because if it is less than 0.3 parts by weight,
This is because the reinforcing effect of the fibers and the effect of preventing cracks due to shrinkage will be reduced, and if the fiber is more than 5 parts by weight, the fiber will become bulky and workability will be poor, but the cost will also increase, and the reinforcing effect will not improve that much. .

In the structure according to claim 2, cement 10 is added to the structure body.
0 parts by weight, solid content of synthetic resin emulsion 3
The heat insulating layer is formed by wet-applying a heat insulating material that is a mixture of ~50 parts by weight, 1 to 20 parts by weight of organic microballoons, and 0.3 to 5 parts by weight of carbon fiber.

Here, wet construction of a heat insulating material refers to forming a heat insulating layer by attaching a heat insulating material, which is a viscous fluid, to the surface of the structure body by spraying, troweling, etc. [Function] Claim 1 The described heat insulating material is, for example, made by mixing cement into a paste-like mixture prepared by pre-mixing and kneading synthetic resin emulsion, carbon fiber, organic microballoons, and if necessary, water-soluble resin, antifoaming agent, antifungal agent, etc. Manufactured by kneading.

In the structure according to claim 2, a seamless heat insulating layer is formed by wet-applying the heat insulating material according to claim 1 to the structure main body, so that heat conduction inside and outside the structure is effectively prevented. At the same time, flame retardancy is improved.

Forming a heat insulating layer through wet construction involves, for example, spraying a viscous fluid heat insulating material onto the concrete surface to a predetermined thickness on site, or applying it with a trowel, etc., and attaching the heat insulating material to the structure body. This is done by

A structure in which such a heat insulating layer is formed has a moderate water absorption rate even though the heat insulating layer itself has a small moisture permeability coefficient, so when the humidity increases indoors, the heat insulating layer absorbs moisture.
When the humidity in the room becomes low, the moisture is collected in the heat insulating layer and released from the heat insulating layer, automatically adjusting the humidity in the room.

〔Example〕

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, details of the present invention will be described with reference to embodiments shown in the drawings.

FIG. 1 shows an embodiment of the structure of the present invention, and in the figure, reference numeral 31 indicates a roof slab that is the main body 33 of the structure.

This roof slab 31 is supported by beams 35 which are the main body 33 of the structure.

A heat insulating layer 37 is formed on the inner surface of the beam 35 and the lower surface of the roof slab 31. The heat insulating layer 37 formed on the lower surface of the roof slab 31 is formed, for example, about 50 to 60 cm from the inner side surface of the beam 35. This is to prevent heat bridges, that is, heat from the outside being conducted around the ceiling surface.

This heat insulating layer 37 is formed by attaching a heat insulating material, which is a viscous fluid, to the inner surface of the beam 35 and the lower surface of the roof slab 31.

This heat insulating material is composed of a cement synthetic resin emulsion, carbon fibers, organic microballoons, water, water-soluble resins such as thickeners, anti-sag agents, antifoaming agents, and anti-mold agents.

The cement used is early-strength Portland cement.

In addition, synthetic resin emulsions include, for example, acrylic,
Vinyl acetate type 1 synthetic rubber type, vinylidene chloride type, vinyl chloride type, or a mixture thereof.

The carbon fiber has a fiber length of about 6 mm, for example.

Furthermore, organic microballoons have a particle size of, for example,
The thickness is 10 to 100 μm, and the specific gravity is 0.04 or less.

Further, the thickener is, for example, methylcellulose.

It is considered to be a water-soluble polymer compound such as polyvinyl alcohol or hydroxyethyl cellulose.

Such a heat insulating material consists of 62 parts by weight of a synthetic resin emulsion (solid content concentration 45%) (27.9 parts by weight in terms of solid content),
2.6 parts by weight of carbon fiber, 10°4 organic microballoon
It is manufactured by mixing and kneading 100 parts by weight of early-strength Portland cement with 100 parts by weight of a semi-liquid mixture consisting of 125 parts by weight of water and small amounts of thickeners, antifoaming agents, and antifungal agents. Ru.

The heat insulating material manufactured in this way has the properties shown in the following table.

That is, the thermal conductivity is 0.05 (kcal/mhr''
C), raw specific gravity is 0. 52. Air dry specific gravity is 0.30. Bending strength: 14.1 (kgf/cil), Compressive strength: 1
6.5 (kgf/cffl).

Adhesion strength6. 8 (kgf/cJ), moisture permeability coefficient is 0
．． 127 (g/rrfhmmHg), water absorption rate is 2
It is 0.5 (%).

The structure configured as described above is constructed by spraying a heat insulating material, which is a viscous fluid, on the surface of the structure body 33, applying it with a trowel,
For example, by wet construction such as filling into voids, the thickness of
It is constructed by forming a heat insulating layer 37 of 15 an.

Thus, the structure configured as described above includes the structure main body 33, cement, synthetic resin emulsion, organic microballoon, and carbon fiber.

A seamless heat insulating layer 37 is formed by wet-applying a heat insulating material mixed with water and a small amount of thickener, antifoaming agent, and anti-mold agent, which effectively prevents heat conduction inside and outside the structure. It is possible to improve flame retardancy. In addition, the heat insulating layer 37 formed on the structure body 33 has high heat insulation performance and adheres well to the structure body 33,
Since the heat insulating layer 37 itself has high strength and is flame retardant, the heat insulating layer 37 itself can be used as a finished surface,
Alternatively, using the heat insulating layer 37 as a base, paint directly on it.
Cosmetic finishes such as spraying, cloth pasting, and tiling can be applied. Therefore, it can be easily applied to any shaped part, and the construction process can be significantly reduced, making it possible to significantly reduce labor and costs.

Furthermore, since the heat insulation performance can be improved, the occurrence of dew condensation can be reliably prevented.

In addition, the heat insulating material formed as described above has a thermal conductivity of 0.05 (kcal/mhr"C), and the thermal conductivity of the organic heat insulating material (0.02 to 0.03 kcal/mhr"C).
1/mhr'c), it is not so large compared to 1/mhr'c), so it can have almost the same heat insulation performance as an organic heat insulating material. This is because since the mortar contains organic microballoons, air pockets will be formed in the mortar. Also, since air pockets are formed in the mortar, the raw specific gravity is 0.54. The air-dried specific gravity is 0.31, making it possible to form a very light heat insulating material.

Furthermore, since such a heat insulating material is a heat insulating material having cement as a matrix, flame retardance can be significantly improved compared to organic heat insulating materials.

In addition, the insulation material is a synthetic resin emulsion in the mortar,
Contains carbon fiber, so the internal bond is strong,
Compressive strength of conventional hard urethane foam (1,4-2.
0kgf/c+fl) and the compressive strength of polystyrene foam (2.5~3.0kgf/cbo),
The compressive strength of the insulation material of the present invention is 16.5 kg f/c
i, the bending strength is 14.1 kgf/c, which is a significant improvement in strength compared to the conventional one.

Furthermore, since it contains a synthetic resin emulsion, the adhesion strength of the insulation material to the concrete surface is 6.8 kgf.
/cIII, it is possible to promote the integration of the heat insulating material into the concrete surface, and it is possible to reliably prevent the heat insulating material from peeling off. For this reason, the insulation material can be applied wet, making it possible to apply it to ceiling surfaces, dye molds, etc., which were difficult to do with conventional methods such as spraying foamed urethane or dry installation using insulation boards. It is also possible to easily install a heat insulating material in a circular building, etc., which has many external corners and internal corners. Therefore, the construction process for making a building into a heat-insulating structure can be significantly reduced, and the construction can be performed seamlessly, so that in addition to improving the heat-insulating performance, labor and costs can be significantly reduced.

Further, the heat insulating material can be a breathable heat insulating material, and indoor humidity can be automatically adjusted.

That is, the moisture permeability coefficient of the insulation material is 0.127 (g/rIfh
mmHg), but has moderate water absorption performance with a water absorption rate of 20.5 (%), so when the humidity increases indoors, the heat insulating layer 37 absorbs moisture, and the moisture accumulates within this heat insulating layer 37. When the indoor humidity becomes low, moisture is released from the heat insulating layer 37, and the indoor humidity can be automatically adjusted.

On the right side of the table mentioned above, 28 parts by weight of synthetic resin emulsion (6.3 parts by weight in terms of solid content), 2.6 parts by weight of carbon fiber, 24 parts by weight of organic microballoon, 137 parts by weight of water,
In addition, the properties of a heat insulating material manufactured by mixing and kneading 100 parts by weight of powder with 100 parts by weight of a semi-liquid mixture consisting of a small amount of thickener, antifoaming agent, and antifungal agent are described as a comparative example. did.

Here, the powder was composed of 16 parts by weight of inorganic microballoons based on 100 parts by weight of early-strength Portland cement.

The thermal conductivity of this insulation material is 0.06 (kcal)
mhr 'C), raw specific gravity is 0.54. Air dry specific gravity is 0°31, bending strength is 12. 8 (kgf/cffl),
Compressive strength 14.8 (kgf/CT1), adhesive strength 6
．． 2 ()cgf/cm), moisture permeability coefficient is 0. 31
5 (g/nfhmm)Ig), water absorption rate is 31.4
(%)Met.

Comparing the present example and the comparative example, the comparative example contains inorganic microballoons and has a small amount of synthetic resin emulsion, so the present example has a higher bending strength and compressive strength than the comparative example. It can be seen that the adhesion strength improves as well.

In addition, compared to conventional heat insulating materials that use cement as a matrix, for example, when using foamed mortar, perlite mortar, etc. as a heat insulating material, the performance of commercially available foamed insulating mortar is The rate is
0.09-0.12 (kca 1/mhr 'C),
Compressive strength 3-5 (kgf/cIII) 1 Adhesion strength to mortar board 1. 1 (kgf/afl), and when compared with this example, it can be seen that this example is far superior in terms of strength and heat insulation performance.

Incidentally, in the above embodiment, an example was explained in which the heat insulating material of the present invention was wet applied to the structure main body 33 as shown in FIG. 1, but the present invention is not limited to the above embodiment.
A heat insulating layer 45 may be formed on the inner surface of the beam 41 and the lower surface of the floor slab 43 as shown in FIG. 2, and a heat insulating layer 51 may be formed on the inner surface of the outer wall 47 and both sides of the partition wall 49 as shown in FIG. Alternatively, as shown in FIG. 4, a heat insulating layer 57 may be formed on the inner surface of the outer wall 53 and on both sides of the column 55, and as shown in FIG. Of course, it is also good to form 63.

In addition, the amount of each material used is within the range of 3 to 50 parts by weight of synthetic resin emulsion as solid content, 1 to 20 parts by weight of organic microballoons, and 0.3 to 5 parts by weight of carbon fiber, per 100 parts by weight of cement. Even if it is changed, substantially the same effect as the above embodiment can be obtained. In this case, by changing the proportions of various materials, the strength, specific gravity, insulation performance, fire resistance performance, etc. can be changed to achieve insulation performance that meets the purpose.

A heat insulating material with fire resistance, strength, etc. can be obtained.

Further, in the above embodiment, an example was explained in which the heat insulating layer 37 was formed on the inner surface of the structure main body 33, but the present invention is not limited to the above embodiment, and the heat insulating layer was formed on the outer surface of the structure main body. However, almost the same effect as in the above embodiment can be obtained.

Furthermore, in the above embodiments, an example was explained in which a small amount of a thickener, an antifoaming agent, and a fungicide were mixed into the heat insulating material, but the present invention is not limited to the above embodiments; antifoaming agent,
Almost the same effect as in the above embodiment can be obtained even without mixing a fungicide or the like, or even if other materials are mixed as necessary.

〔Effect of the invention〕

The heat insulating material according to claim 1 contains 3 to 50 parts by weight of synthetic resin emulsion in terms of solid content, 1 to 20 parts by weight of organic microballoons, and 0 parts by weight of carbon fiber, per 10 parts by weight of cement.
．． Since the mortar contains 3 to 5 parts by weight, wet construction is possible, and flame retardancy and heat insulation performance can be greatly improved.In other words, since the mortar contains synthetic resin emulsion and carbon fiber, internal bonding becomes strong, and in addition to the effect of preventing cracks, it is possible to improve the strength such as compressive strength 2 bending strength.

Furthermore, since it contains a synthetic resin emulsion, it is possible to improve the adhesion strength of the heat insulating material to the concrete surface.

Furthermore, since it contains organic microballoons, air pockets are formed in the mortar, which can reduce thermal conductivity and improve heat insulation performance.

Furthermore, since such a heat insulating material has cement as a matrix, it can improve flame retardancy.

In the structure according to claim 2, cement 1 is added to the structure body.
00 parts by weight, a heat insulating material mixed with 3 to 50 parts by weight of the solid content of synthetic resin emulsion, 1 to 20 parts by weight of organic microballoons, and 0.3 to 5 parts by weight of carbon fiber is applied wet. As a result, a seamless heat insulating layer is formed, which can effectively prevent heat conduction inside and outside the structure, and improve flame retardancy. In addition, the heat insulating layer formed on the structure body has high heat insulating performance, adheres well to the structure body, and the heat insulating layer itself has high strength and flame retardancy. It can be used as it is as a finished surface, or a decorative finish such as painting, spraying, cloth pasting, tiling, etc. can be applied directly to the heat insulating layer as a base. Therefore, the construction process can be significantly reduced, and compared to conventional systems, a larger effective space can be secured, and labor and costs can be significantly reduced.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view showing an example of a structure in which the heat insulating material of the present invention is used. FIG. 2 is a longitudinal sectional view showing another example in which the heat insulating material of the present invention is used in a structure. 3 to 5 are cross-sectional views showing other examples in which the heat insulating material of the present invention is used in a structure. [Explanation of symbols of main parts] 33... Structure body 37.45, 51, 57.63... Heat insulation layer. Patent applicant: Takenaka Corporation

Claims (2)

[Claims] (1) 100 parts by weight of cement, mixed with 3 to 50 parts by weight of synthetic resin emulsion in terms of solid content, 1 to 20 parts by weight of organic microballoons, and 0.3 to 5 parts by weight of carbon fiber. A heat insulating material featuring: (2) In the structure body, 100 parts by weight of cement, 3 to 50 parts by weight of synthetic resin emulsion in terms of solid content, 1 to 20 parts by weight of organic microballoons, and 0.3 parts by weight of carbon fiber.
A structure characterized in that a heat insulating layer is formed by wet construction of a heat insulating material mixed with ~5 parts by weight.