JP3190288B2 - Hard-to-peel lightweight surface material - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a surface covering material, and more particularly to a surface covering material, for example, for installing on the underground of concrete, mortar, etc. on indoor and outdoor walls of a building.
The present invention relates to a unique surface covering material that is lightweight and has both flame-resistant and flame-retardant properties.

[0002]

2. Description of the Related Art Hitherto, as a surface covering material, a relatively lightweight tile having a specific gravity of less than 2, for example, using a glass waste material has been provided. On the other hand, for example, a surface covering material using a large amount of a flame-retardant aggregate such as aluminum hydroxide as the aggregate to enhance the flame retardancy has also been provided. Lightweight surface materials are advantageous in terms of lower transportation costs as building materials and ease of construction,
Flame-retardant surface materials are effective in terms of fire prevention measures and the like.

[0003]

However, recently, there has been a demand for a higher level of surface covering materials from the construction site, such as the fact that the above-mentioned conventional surface covering materials are simply light-weight or simply flame-retardant. Now, that demand is no longer being met.

[0004] The first requirement is that, in view of the fact that surface covering materials applied to wall surfaces and the like often peel off, in order to improve the durability of the wall surface and safety against the human body, it is necessary to use a hard-to-peel surface covering. I want you to provide the materials. " It is thought that it is at least very lightweight to be easily peelable, but as a result of additional tests, it is not always sufficient to use a surface material with a specific gravity of 1.5 or less as an experimental index for that purpose. It was discovered that it was not possible to achieve a high level of exfoliation. As a result, it was found that low specific gravity is a necessary condition, but not a sufficient condition, and as a result of further trial and error,
We found that the cohesive strength of the surface material such as concrete and mortar is the key to solving the problem.

[0005] The second requirement is a requirement for a surface material having various characteristics, such as "I want a surface material having both sufficient light weight and flame retardancy". Generally, if a well-known flame-retardant material such as aluminum hydroxide is mixed in a large amount into the surface material, the flame retardancy is sufficient, but the lightness is sacrificed. The specific gravity of the conventional flame-retardant surface material and the like is more than three. That is, with conventional common sense, it is considered that there is a trade-off between sufficient lightness and sufficient flame retardancy. In this regard, as a result of trial and error, the present inventor has found that the key to solving the problem is to use a lightweight aggregate and a flame-retardant aggregate together and to adjust the composition ratio of both to a certain range. Ascertained that there is a point.

[0006]

[Point of view] Regarding the peeling of the surface material, the present inventor presupposes that the problem is that the specific gravity of the surface material is excessive, and that the base material of the surface material has a strong cohesive force such as concrete or mortar. In the case of this, it has been noticed that there is an action mechanism whereby a strong stress is generated which causes a displacement in the plane direction on the bonding surface between the base material and the surface material, and as a result, the bonding surface is easily peeled off.

[0007] Even if measures such as using a strong adhesive to withstand the cohesive force of the base or forming irregularities for preventing peeling on the back surface (adhesion surface) of the surface material, As long as the stress itself remains, peeling due to destruction of the bonding surface or the like will eventually occur. Therefore, a surface material that can essentially solve the problem is sufficiently lightweight and eliminates or reduces the above-mentioned stress. Having arrived at the fact that they must have such properties, the following first invention has been completed.

Regarding compatibility between sufficient light weight and flame retardancy, attention was paid to an inorganic foam material which is particularly excellent in light weight and also has heat resistance. When both the inorganic foam material and the excellent flame retardant material, such as aluminum hydroxide, are selectively used as aggregates, and the weight composition ratio is limited to a certain range, sufficient light weight and low weight are obtained. Based on experimental facts, it was determined that both flammability and compatibility could be achieved, and the following second invention was completed.

[0009]

[Means for Solving the Problems]

(Structure of the First Invention) A first invention of the present application for solving the above problems.
The structure of the invention (the invention according to claim 1) is such that at least 10 parts by volume of the aggregate is a lightweight aggregate of the following A, a component of the following B is used as a binder, and the specific gravity is 1.
Less than 5 is a hard-to-peel lightweight covering material capable of plastic deformation. A. Inorganic or organic foam. B. Thermoplastic synthetic resin.

(Structure of the Second Invention) The structure of the second invention (the invention described in claim 2) for solving the above-mentioned problem is as follows.
10 to 50 parts by volume of the aggregate is a lightweight aggregate of the following C, 30 to 90 parts by volume of the aggregate is a flame retardant aggregate of the following D,
The following component E is used as a binder, and
It is a flame-retardant lightweight surface covering material having a specific gravity of less than 1.5 and exhibiting a flame retardancy of flammability grade 3 or more specified in JIS-A1321. C. Inorganic foam. D. High endothermic inorganic aggregate. E. FIG. Inorganic flame retardant binder.

[0011]

[Action and Effect of the Invention]

(Operation / Effect of First Invention) The hard-to-peel lightweight covering material according to the first invention is lightweight, having a specific gravity of less than 1.5. Such a low specific gravity can be realized because the inorganic or organic foam material occupies at least 10 parts by volume of the aggregate. For this reason, it is possible to reduce the transportation cost and reduce the physical burden on the builder, and also to realize the lightweight property, which is a prerequisite for the difficulty in peeling off.

The hard-to-peel lightweight covering material according to the first invention uses a thermoplastic synthetic resin as a binder. This binder may be added as a synthetic resin powder for a binder that can be melted at the time of manufacturing a hard-to-peel lightweight surface covering material, or may be used as a synthetic resin of an emulsion that is a raw material for manufacturing a surface covering material. It may be. A surface covering material using such a binder is capable of undergoing a certain degree of plastic deformation as a whole of the surface covering material while maintaining necessary rigidity.

Therefore, for example, when the hard-to-peel lightweight surface covering material according to the first invention is applied to a ground having a strong cohesive force such as concrete or mortar, a flat surface is applied to the bonding surface between the ground and the surface mounting material. Even if a strong stress causing the displacement is generated, the surface material undergoes a slight plastic deformation in the direction in which the stress acts, whereby the stress is eliminated or relaxed, and the adhesive surface is hardly separated. Examples of such plastic deformation include a case where the facing material is slightly curved as a whole, and a case where the facing material slightly reduces its area and increases its thickness.

[0014] Since the surface material is very light as described above, the peeling pressure due to the weight of the surface material is small, so that the surface material is more difficult to peel. As a result of the above actions and effects, the surface covering material of the present invention is hard to peel off. In addition,
Even if the surface materials fall off due to improper construction, etc., and unfortunately hit the human body passing below, it is very light, unlike ordinary surface materials such as tiles and stones And can be plastically deformed, so that damage to the human body can be minimized.

(Function / Effect of Second Invention) The flame-retardant lightweight surface covering material according to the second invention is lightweight, having a specific gravity of less than 1.5. Since 10 to 50 parts by volume of the aggregate is an inorganic foam material, such a low specific gravity can be realized. Therefore, it is possible to reduce the transportation cost and reduce the physical burden on the installer.

Further, the flame-retardant lightweight covering material according to the second aspect of the present invention exhibits a flame-retardancy degree of the third or higher grade specified in JIS-A1321. Since 30 to 90 parts by volume of the aggregate is occupied by the highly heat-absorbing inorganic aggregate which is a flame-retardant aggregate, such a flame retardancy can be realized. And, as mentioned above,
The balance that the special lightweight aggregate is 10 to 50 parts by volume and the excellent flame-retardant aggregate is 30 to 90 parts by volume makes it possible to achieve both sufficient lightness and flame retardancy.

[0017]

Next, embodiments of the first invention and the second invention will be described.

In the first and second aspects of the present invention, the term "covering material" refers to a wall of any building,
It includes, without limitation, materials used for surface covering such as floors and ceilings, and includes, for example, tiles, sidings, decorative panels, and the like.

[Lightweight Aggregate of the First Invention] The lightweight aggregate in the first invention, that is, the A component is an inorganic or organic foam material. A combination of two or more of these may be used.
These have very low specific gravity due to their material form,
It greatly contributes to the weight reduction of exterior materials. Among the inorganic or organic foam materials, particularly preferred are inorganic or organic hollow spherical foam materials. The particle size of the foam is not particularly limited as long as it is not clearly contrary to the purpose of use as the lightweight aggregate.

Examples of the inorganic foam material or the hollow spherical foam material include so-called shirasu balloon, pearlite obtained by crushing obsidian or perlite and heating and foaming, expanded vermiculite, expanded shale, pumice, and glass waste material to form a foam. G-lite (trade name), micro-balloon, silica gel foam, granulated foam of slag, foamed or expanded material of natural minerals such as granulated foam using clay powder, or artificial lightweight aggregate But not limited thereto. As an organic foam or hollow spherical foam,
Examples include, but are not limited to, foamed powders of EVA (ethylene vinyl acetate) polystyrene, polyethylene, polyurethane, polyethylene-vinyl acetate copolymer, polyvinyl chloride, natural or synthetic rubber, and the like.

One of the above-mentioned inorganic or organic foam materials may be used alone, or two or more thereof may be used together. These foam materials occupy at least 10 parts by volume, more preferably 30 parts by volume or more, of all the aggregates contained in the facing material.

[Binder of the First Invention] The binder in the first invention, that is, the B component, is a thermoplastic synthetic resin derived from a thermoplastic resin-based emulsion or a thermoplastic resin powder for a binder at the time of manufacturing a surface covering material. This binder, unlike an inorganic binder such as a binder made of a thermosetting resin or a cement, imparts some plastic deformability to the surface material.

As a typical thermoplastic synthetic resin,
Acrylic resin is mentioned, in addition, vinyl resin, thermoplastic urethane resin, epoxy resin, and the like,
And it is not limited to these. Representative thermoplastic resin powders include soft heat such as polyethylene, polypropylene, polyvinyl chloride, polyurethane, EVA (ethylene-vinyl acetate copolymer), and poly (meth) acrylates (eg, ethyl methyl acrylate). Butadiene rubber, EPM (ethylene-
Propylene rubber), EPDM (ethylene-propylene-
Diene rubber), SBR (styrene-butadiene rubber),
Examples include, but are not limited to, thermoplastic rubber powders such as NBR (nitrile rubber), olefin rubber, and polyester rubber. The thermoplastic resin powder is mixed in a non-aqueous state with other raw materials of the surface covering material, and then is melted by heating to be in a state of a normal binder for binding the aggregate and the like.

In selecting the binder of the first invention,
Tg (glass transition temperature) of the thermoplastic resin is one index. That is, if the Tg is low, the resin binder is in a slightly softened state at a normal environmental temperature of the surface material,
As a result, plastic deformation is given to the surface material.

[Specific gravity of the facing material of the first invention] The specific gravity of the facing material of the first invention is less than 1.5. More preferably, the specific gravity is about 1.0, and further preferably, it is less than 1.0. If the specific gravity is about 1.0 or less, the contribution to the reduction of the transportation cost, the ease of construction, and the improvement of the hard-to-peel property becomes particularly remarkable.

Theoretically, the specific gravity of the facing material is relatively determined by the specific gravity of each component and the composition ratio. If the foam material or the expanding material occupies a predetermined volume or more in the aggregate, It does not mean that the above specific gravity is necessarily realized. However, as a practical matter, when examining the specific gravity and composition ratio of aggregates, binders, extenders and other additives actually used as surface covering materials, it was found that foaming materials and expanding materials, especially hollow spherical foaming materials, The above specific gravity is realized by occupying at least 10 parts by volume of the medium (up to 100 parts by volume).

Therefore, when aggregates other than the foamed material are used together, and when selecting other components, it is better to use a material having a specific gravity as low as possible as long as the quality of the surface material is not impaired. Needless to say. In addition, by using a large amount of foam, especially hollow spherical foam,
If water absorption is a concern, an appropriate water repellent may be added.

[Plastic Deformation of the Surface Material of the First Invention] Since the surface material of the first invention uses the binder having the above-mentioned B composition, it has plastic deformability. Since the amount of deformation of the surface covering material required for the purpose of the first invention is very small, a material showing a substantially flexible deformability (a material showing some elastic deformation) of the first invention can be used. Included in exterior materials.

[Other components in the facing material of the first invention]
In the dressing material of the first invention, an arbitrary amount of a known or known composition that may be generally added to the dressing material can be added in an arbitrary amount as long as the function and effect of the invention are not contradicted. Examples of a few of them include aggregates such as charcoal (calcium carbonate) and silica sand, and various additives such as plasticizers and emulsifiers.

[Lightweight aggregate of the second invention] The lightweight aggregate in the second invention, that is, the C component, is an inorganic foam material, particularly preferably a hollow spherical foam material, and an organic material is impossible to use. However, it is not preferable to use a large amount because it may impair the flame retardancy. The inorganic foam material has a very small specific gravity due to its material form, and greatly contributes to the weight reduction of the surface material. The type and particle size of the inorganic foam material and the inorganic hollow spherical foam material are the same as in the case of the first invention. As the inorganic foam material, only one kind may be used alone, or two or more kinds may be used together. And these foam materials are 10-50 volume parts of all the aggregates contained in a facing material, More preferably, they are 20-20 volume parts.
It occupies 40 capacity parts.

[Flame-retardant aggregate of the second invention] The flame-retardant aggregate of the second invention, that is, the D component is, in part, a highly endothermic inorganic aggregate having a large degree of hydration. As one criterion, for example, “100 parts by weight at a constant temperature of 100 ° C.,
About 15 parts by weight or more of them are dehydrated by heating at 00 ° C,
A substance that decreases ”. Such aggregates make a particularly large contribution to improving flame retardancy. However, it is not limited to those with such a degree of hydration,
For example, a substance showing a decomposition endothermic reaction under a heating atmosphere of 600 ° C. or more in the flame retardancy test can be included.

The flame-retardant aggregate of the second invention includes, for example, hydrates of aluminum oxide (aluminum hydroxide, gibbsite mineral, boehmite, diaspor, diaspore, etc.), zeolite-based substances (chapazite, chabazite, heurandite, Mordenite, etc., silica-alumina substances (allophane, halloysite, unexpanded vermiculite, non-expanded or expanded vermiculite, etc.), magnesia substances (brucite, attapulgite, etc.), substances with a high degree of hydration such as satin white, ettringite, boric acid, etc. And calcium carbonate, magnesium carbonate (magnesite), dolomite plaster, and the like, but are not limited thereto. The flame-retardant aggregate occupies 30 to 90 parts by volume, more preferably 50 to 90 parts by volume, of all the aggregates contained in the facing material.

[Binder of the Second Invention] The binder in the second invention, that is, the E component is an inorganic flame-retardant binder represented by cement (particularly, hydraulic cement such as Portland cement), water glass, or the like. is there. Unlike the binder of the first invention, it does not impart plastic deformation to the surface material, but contributes to improving the flame retardancy of the surface material.

[Specific Gravity of Surface Material of Second Invention] The specific gravity of the surface material of the second invention is less than 1.5. More preferably, the specific gravity is about 1.0, and further preferably, it is less than 1.0. In relative terms, in the facing material of the second invention, unlike the facing material of the first invention, the flame-retardant aggregate occupies a predetermined volume or more in the aggregate. Specific gravity tends to increase. However, since the lightweight aggregate includes the predetermined capacity portion, the above specific gravity can be realized.

Also in the surface covering material of the second invention, it is preferable to use a material having a low specific gravity as much as possible, as long as the quality of the surface covering material is not impaired, in selecting components other than the C to E components. It is the same as the first invention that an appropriate water repellent or the like may be added when water absorption is concerned by using a foam material, particularly a hollow spherical foam material.

[Flame Retardancy of the Surface Material of the Second Invention] The surface material of the second invention has a flame retardancy of flammability class 3 or higher specified in JIS-A1321. Although the flame retardancy is mainly due to the fact that the flame retardant aggregate occupies 30 to 90 parts by volume as described above, the fact that both the C and E components are inorganic also contributes to the auxiliary. are doing.

[Other components in the facing material of the second invention]
Similarly to the surface covering material of the first invention, the surface covering material of the second invention may be any well-known or publicly known component that may be generally added to the surface covering material as long as it does not contradict the operation and effect of the invention. Any amount can be added. Examples of a few of them include aggregates such as silica sand and various additives such as plasticizers and emulsifiers.

[0038]

Next, examples and comparative examples according to the first and second aspects of the present invention will be described.

[Bulk Specific Gravity of Aggregate Used in Examples and Comparative Examples] The types of aggregate used in each of the following Examples and Comparative Examples and their bulk specific gravities are shown in a list. Bulk of glass waste material Bulk specific gravity 0.5 Shirasu balloon Bulk specific gravity 0.2 Silica sand Bulk specific gravity 1.5 Calcium carbonate Bulk specific gravity 1.3 Aluminum hydroxide Bulk specific gravity 1.3 EVA foam pulverized product Bulk specific gravity 0.2 Pearlite pulverization Product bulk specific gravity 0.3

[Examples and Comparative Examples of the First Invention] The following Examples 1 to 5 and Comparative Examples 1 and 2 were performed as Examples and Comparative Examples of the first invention. For each of the examples, the raw material blending ratio (parts by weight-in the emulsion, by weight in a water-containing state) and the volume part of the aggregate component are shown. In the following, "additive" refers to a viscosity modifier or dispersant, and "plasticizer" refers to DBP (dibutyl phthalate) or DOP (dioctyl phthalate).

(Example 1) Acrylic resin emulsion 250.0 parts by weight Additive 5.0 parts by weight Glass waste foam 75.0 parts by weight 150.0 parts by volume Shirasu balloon 30.0 parts by weight 150.0 parts by volume Kei Sand 225.0 parts by weight 150.0 parts by volume Calcium carbonate 195.0 parts by weight 150.0 parts by volume

(Example 2) Acrylic resin powder 100.0 parts by weight Plasticizer 20.0 parts by weight Waste glass foam 75.0 parts by weight 150.0 parts by volume Shirasu balloon 45.0 parts by weight 150.0 parts by volume Kei Sand 225.0 parts by weight 150.0 parts by volume Calcium carbonate 195.0 parts by weight 150.0 parts by volume

(Example 3) Acrylic resin emulsion 250.0 parts by weight Additive 5.0 parts by weight Glass waste foam 75.0 parts by weight 150.0 parts by volume EVA foamed and pulverized product 30.0 parts by weight 150.0 parts by volume Part Silica sand 225.0 parts by weight 150.0 parts by volume Calcium carbonate 195.0 parts by weight 150.0 parts by volume

Example 4 Acrylic Resin Emulsion 250.0 parts by weight Additive 5.0 parts by weight Glass waste foam 75.0 parts by weight 150.0 parts by volume Pearlite pulverized product 45.0 parts by weight 150.0 parts by volume Silica sand 225.0 parts by weight 150.0 parts by volume Calcium carbonate 195.0 parts by weight 150.0 parts by volume

(Example 5) Acrylic resin emulsion 250.0 parts by weight Additive 5.0 parts by weight Shirasu balloon 12.0 parts by weight 60.0 parts by volume Silica sand 405.0 parts by weight 270.0 parts by volume Calcium carbonate 350 0.0 parts by weight 270.0 parts by volume

(Comparative Example 1) In this example, a commercially available "lightweight ceramic interior and exterior tile puff brick" manufactured by Nittai Industry Co., Ltd. was used. This product has a specific gravity of 1.1,
Difficult to peel off due to the presence of back feet on the back. "It is.

Comparative Example 2 Acrylic resin emulsion 250.0 parts by weight Additive 5.0 parts by weight Silica sand 450.0 parts by weight 300.0 parts by volume Calcium carbonate 390.0 parts by weight 300.0 parts by volume

(Dry Specific Gravity and Plastic Deformability Test of Each Example) Each of the composition examples of Examples 1 to 5 and Comparative Examples 1 and 2 was mixed by a conventional method to obtain a metal. A 200 mm x 60 mm x 15 mm surface covering material was trial-produced by pouring into a mold made of plastic, and then demolded. The dry specific gravity was measured, and the longitudinal direction of the surface covering material was measured along a 450 mm diameter PVC pipe. Was subjected to a plastic deformation test for bending.

As a result, the dry specific gravities were as in Example 1 respectively.
0.8, Example 2 was 1.0, Example 3 was 0.8, Example 4 was 0.8, Example 5 was 1.0, Comparative Example 1 was 1.1,
Comparative Example 2 was 1.5. Regarding the plastic deformation test, Examples 1 to 5 were all able to bend without cracking, and Comparative Example 1 was not able to withstand bending and cracked.
Comparative Example 2 could be bent, but as shown in the composition table, did not contain lightweight aggregates, and thus had a dry specific gravity of 1.5 as described above, which was excessive.

(Exfoliation Test of Each Example) The following exfoliation tests were performed on the trial surface materials of Examples 1 to 5 and Comparative Examples 1 and 2 by simulating the phenomenon of exfoliation of the surface materials. Was.

That is, first, as shown in FIG. 1, three rectangular parallelepiped ALC blocks 1, 2, 3 (width 200 mm ×
A 450 mm long × 50 mm deep) was prepared, and these were fixed with a ceiling with the central ALC block 1 being raised about 50 mm, with the front side surfaces flush with each other.
Next, as shown in FIG. 2, a total of eight facing materials 4 were stuck across the joint between the ALC blocks 1 and 2 or the joint between the ALC blocks 1 and 3. The back surface of each surface material 4
Using a modified silicone adhesive MA Bond S manufactured by Kikusui Chemical Industry, the present applicant, two ALC blocks 1 to 1 are used.
The whole surface was adhered for 2 or 1 to 3 times.

After the above setting, the central ALC block 1
Was applied vertically downward at a pressing speed of 1 mm per minute, and the ALC block 1 was displaced downward by 10 mm for 10 minutes, and then the pressure was released. Such an operation 1
As a cycle, a total of three cycles were performed, and the test was terminated when at least one of the outer cover materials 4 had fallen off during the cycle.

As a result, the first, third, and fourth embodiments have the third
No sheets were peeled off until the end of the cycle. In Example 2 (dry specific gravity: 1.0), in which the amount of the acrylic resin powder used as the binder was slightly smaller, peeling occurred at the time of the displacement of 5 mm downward in the third cycle, and Example 5 (drying) in which the amount of lightweight aggregate used was slightly smaller. (Specific gravity: 1.0) caused spalling at the time of 9 mm downward displacement in the second cycle. However, Comparative Example 1 having no plastic deformability (dry specific gravity 1.1) peeled off at the point of displacement of only 3 mm downward in the first cycle, and was excellent in plastic deformability but did not use lightweight aggregate. Example 2 (dry specific gravity 1.
In 5), peeling occurred at the time of the displacement of 5 mm in the second cycle, so that all of the examples showed better peeling resistance than the comparative example.

[Examples and Comparative Examples of the Second Invention] As Examples and Comparative Examples of the second invention, the following Example 6 and Comparative Examples 3 to 5 were performed. For each of the examples, the raw material blending ratio (parts by weight-in the emulsion, by weight in a water-containing state) and the volume part of the aggregate component are shown. The meanings of “additive” and “plasticizer” are the same as described above.

Example 6 Portland Cement 125.0 parts by weight Water 75.0 parts by weight Vinyl chloride resin emulsion 50.0 parts by weight Glass waste foam 50.0 parts by weight 100.0 parts by volume Shirasu balloon 20.0 parts by weight Parts 100.0 parts by volume Aluminum hydroxide 390.0 parts by weight 300.0 parts by volume Silica sand 150.0 parts by weight 100.0 parts by volume

(Comparative Example 3) Portland cement 125.0 parts by weight Water 75.0 parts by weight Vinyl chloride resin emulsion 50.0 parts by weight Glass waste foam 15.0 parts by weight 30.0 parts by volume Shirasu balloon 4.0 parts by weight Parts 20.0 parts by volume Aluminum hydroxide 195.0 parts by weight 150.0 parts by volume Silica sand 600.0 parts by weight 400.0 parts by volume

(Comparative Example 4) Portland cement 125.0 parts by weight Water 75.0 parts by weight Vinyl chloride resin emulsion 50.0 parts by weight Aluminum hydroxide 390.0 parts by weight 300.0 parts by volume Silica sand 450.0 parts by weight 300.0 capacity part

Comparative Example 5 Portland cement 125.0 parts by weight Water 75.0 parts by weight Vinyl chloride resin emulsion 50.0 parts by weight Glass waste foam 50.0 parts by weight 100.0 parts by volume Shirasu balloon 20.0 parts by weight Part 100.0 volume part silica sand 600.0 weight part 400.0 volume part

(Dry Specific Gravity and Flame Retardancy Test of Each of the Above Examples) With respect to the blending examples of Example 6 and Comparative Examples 3 to 5,
The mixture was mixed by a conventional method, poured into a metal mold, dried, and demolded to obtain a 200 mm
A surface material of × 60 mm × 15 mm was trial-produced, its dry specific gravity was measured, and a flame retardancy test according to JIS A1321 was performed to determine the flame retardancy. The description of the content of the flame retardancy test is omitted.

As a result, the dry specific gravities were as in Example 6 respectively.
Was 1.2, Comparative Example 3 was 1.5, Comparative Example 4 was 2.0, and Comparative Example 5 was 1.2. Regarding the flame retardancy test, Example 3 passed the third grade of flame retardancy. As for the comparative examples, Comparative Example 3 in which the amount of the flame-retardant aggregate used was too small and Comparative Example 5 in which the flame-retardant aggregate was not used failed the third class of the flame retardant. Further, Comparative Example 4, which did not use lightweight aggregate and excessively used flame-retardant aggregate, passed the third grade of flame retardancy, but this example had an excessively high dry specific gravity of 2.0 as described above. is there.

[Brief description of the drawings]

BRIEF DESCRIPTION OF DRAWINGS FIG. 1 is a view showing a procedure for conducting a peeling test of a surface material.

FIG. 2 is a diagram showing a procedure for conducting a peeling test of a surface material.

[Explanation of symbols]

 1-3 ALC block 4 Exterior material

Continuation of the front page (51) Int.Cl. ⁷ identification code FI C04B 14:02 16:08) 111: 40 (58) Field surveyed (Int.Cl. ⁷ , DB name) C04B ^7/ 00-28/36 C04B 38/00-38/10 E04F 13/08

Claims (2)

(57) [Claims] 1. An aggregate comprising at least 10 parts by volume of a lightweight aggregate of the following A, a component of the following B being used as a binder, a specific gravity of 1.0 or less , and plastic deformation. A light-weight exterior material that is difficult to peel off. A. Inorganic or organic foam. B. Thermoplastic synthetic resin. 2. The hard-to-peel lightweight covering material according to claim 2, wherein
The lightweight aggregate is an inorganic foam material, and the following C and / or
Contains the following component D and complies with JIS-A1321.
It is characterized by exhibiting the specified flame retardance of 3rd grade or higher
The hard-to-peel lightweight covering material according to claim 1 . C. High endothermic inorganic aggregate. D. Inorganic flame retardant binder.