JPH09255401A - Nailable self-smoothing composition and working method therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a self-smoothing composition that does not cause chalking, projections and air bubbles in its surface, does not bristling up the compounded fibers, forms a rigid curing product of smooth surface capable of offering floor surfaces of high level-accuracy, allows nails for flooring to drive into cured bodies of the compound without preparatory work for the nailing, thus widely improving the work efficiency; and to provide a working method for applying the compound. SOLUTION: This self-smoothing compound comprises 100 pts.wt. of a mixture composed of gypsum and/or cement, a fluidizing agent, thickening agent and defoaming agent, 2-15 pts.wt. of burnt vermiculite which has maximum particle size of 5mm or less and contains 2-15 pts.wt. of particles having smaller particle size than 0.1mm in a smaller quantity than 10wt.%, 0.1-5wt.% of fiber of 3-15mm in length, and 40-100wt.% of water. These are kneaded together and the thus obtained slurry of the nailable self-smoothing compound is flow-spread within the flow-value range of 16-28cm.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a self-smoothing (also referred to as self-leveling or SL) composition suitable as a floor building material for buildings and a method for constructing the composition.

[0002]

2. Description of the Related Art As a floor building material for buildings including interior floor materials for general houses, gypsum, cement, etc. are used as a base material, and aggregates such as silica sand and various additives are mixed and kneaded with water. A method using an SL material that forms a uniform hardened body with good level accuracy when the resulting slurry has flowability but is cast and cured without causing material separation, is known. ing. However, on the formed cured body,
There are occasions where some nails are used when applying flooring materials etc. as floor finishing materials, but when conventional SL materials are used, the nails cannot be driven in because the formed cured body is too strong, In order to drive in a nail, it is necessary to set a guideline beforehand with a drill or the like. Further, there is a method in which a wood portion for nailing is provided on the floor in advance and then the SL material is cast and spread, but both of them have a problem that the construction process is increased. In addition, there is a problem in that, when the construction is performed by sticking only the adhesive without hitting the nail, the sticking phenomenon of the stuck flooring material occurs.

As a mortar material which can be nailed, a hydraulic cement, an organic elastic powdery material and an inorganic expandable powdery material are mixed in a specific amount ratio, kneaded, and hardened to obtain a nailed material. A mortar material for boundary floors that is capable of providing excellent workability, is excellent in impact sound absorbing effect and heat insulating property, and is lightweight (JP-A-7-69753, JP-A7-113312, JP-A-713312, Kaihei 8--40782, etc.). On the other hand, JP 60-24
In 6249 publication, chemical fibers are added to cement together with a reinforcing material in a specific amount ratio, kneaded, kneaded, poured and cured, so that so-called initial cracks in the setting process are unlikely to occur, resulting in a horizontal finish. Compositions for self-leveling have been proposed which provide a surface.

[0004]

SUMMARY OF THE INVENTION
The mortar material for the floor as disclosed in 8- 40782 is a slurry obtained by kneading by adding water, which has poor self-smoothness, has thixotropy (thixotropic property), and has low fluidity. However, the level accuracy of the formed cured body is about 1/200, and good level accuracy cannot be expected. Increasing the amount of water added to increase the fluidity of the slurry causes material separation. Further, there is a problem that the nail bends when the nail is directly driven into the formed cured body.

On the other hand, in the composition for self-leveling described in JP-A-60-246249, since the reinforcing material is added to the cement, the strength of the hardened body formed is large, and the nail for the flooring material is straightened. There is a problem that you can not devote to.

The object of the present invention is to solve these problems of the prior art, to form a smooth and good cured product without white spots / protrusions and traces of bubbles on the surface, and without protrusion of the blended fibers, and to obtain a level. You can get a finished floor with good accuracy,
A self-smoothness composition capable of saving labor and stabilizing floor quality, having desirable performance and workability as an SL material, capable of being nailed, and being lighter than a conventional SL material, and the same To provide a construction method.

[0007]

DISCLOSURE OF THE INVENTION The inventors of the present invention have conducted earnest studies and, together with an additive for SL for imparting self-smoothness to gypsum or / and cement, a calcined vermiculite having a specific particle size and a specific length. It is possible to strike a nail without causing cracks by blending the fibers of (1) in an amount within a specified range and kneading, and then casting and curing the obtained self-smoothness composition at a flow value within a specific range. Yes, because it is lightweight, the weight of the material to be handled is reduced. In addition, a smooth and good cured body is formed with no protrusions, white fluff, and air bubble marks, and a good finished floor surface with a level accuracy of 1/300 or less. The inventors have completed the present invention knowing that they can be easily obtained.

The first invention of the present invention is that "a plaster or / and cement as a base material is mixed with a fluidizing agent, a thickening agent, and a defoaming agent, and the aggregate and the water are added to the mixture. A self-smoothness composition obtained by kneading
2 to 15 parts by weight of burned vermiculite having a maximum particle size of 5 mm or less and a particle size of less than 0.1 mm per 100 parts by weight, but a content rate of less than 10% by weight, and , Fibers with a length in the range of 3 to 15 mm
A nailable self-lubricating composition, characterized in that it is blended in the range of 0.1 to 5 parts by weight. ”.

The second invention of the present invention is "claim 1
Upon applying the composition described, the mixture 1
It is characterized by adding 40 to 100 parts by weight of water per 100 parts by weight and kneading, and casting the resulting composition when the flow value is within the range of 16 to 28 cm to cure. A method of applying a nailable self-smoothness composition. ”.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION The details of the present invention will be described below. The self-smoothness composition of the present invention (hereinafter, also referred to as the composition of the present invention) is based on a gypsum or / and cement having hydraulic properties as a base material, and has a specific range for imparting self-smoothness to the base material. A mixture of a certain amount of superplasticizer, thickener and defoaming agent is blended with a lightweight aggregate of a specific particle size and a fiber of a specific length in an amount within a specified range, and the curing control is used as necessary. It is composed of various additives such as agents and dimensional stabilizers, which can be obtained by adding water in an amount within a specific range and kneading with an appropriate mixer.

As the gypsum having hydraulic properties, various types of gypsum called chemical gypsum, such as type II anhydrous gypsum and hemihydrate gypsum, such as natural gypsum and phosphoric acid byproduct gypsum / hydrofluoric acid gypsum can be used.

As the cement, various kinds of cement such as ordinary Portland cement, early strength Portland cement, moderate heat Portland cement, blast furnace cement, silica cement, fly ash cement, alumina cement and jet cement can be used. As a base material in the composition of the present invention, gypsum and cement can be mixed and used at an arbitrary ratio.

The SL-forming additive for imparting self-smoothness to the substrate for obtaining the composition of the present invention is a fluidizing agent,
It is composed of thickeners and defoamers. The superplasticizer has a function of increasing fluidity without increasing the amount of water mixed in the composition of the present invention, and includes a melamine formalin condensate sulfonate, a lignin sulfonate, a β-naphthalene sulfonic acid aldehyde condensate, Examples thereof include polyalkylallyl sulfonates, polycarboxylates, alkylnaphthalene sulfonates, alkylnaphthalene sulfonic acid formalin condensate salts, and the like, and these can be used alone or in combination of two or more. The types of salts of the above compounds are
These include sodium salt, potassium salt, calcium salt and the like.

The amount of the fluidizing agent added varies slightly depending on the kind and combination thereof, but is
The range is 0.1 to 5 parts by weight, preferably 0.3 to 3 parts by weight. If the addition amount is less than 0.1 part by weight, the effect of improving the fluidity cannot be obtained, and the level accuracy of the finished surface of the formed cured body is reduced. On the other hand, when it exceeds 5 parts by weight, breathing and material separation (floating of aggregate) occur, resulting in unevenness and protrusions on the surface of the formed cured body.

The thickener has a function of preventing the generation of breathing water and the floating of the aggregate when the composition of the present invention is cast and spread, and methyl cellulose, ethyl cellulose,
Cellulose ethers such as hydroxyethyl cellulose, ethyl hydroxymethyl cellulose, ethyl hydroxyethyl cellulose, carboxymethyl cellulose,
Examples include various water-soluble polymers such as polyacrylamide, polyethylene oxide, polyvinyl alcohol, and casein, and these can be used alone or in combination of two or more.

The amount of the thickener added varies slightly depending on the type, molecular weight, combination, etc., but is preferably 0.05 to 3.5 parts by weight, preferably 0.1 to 2.5 parts by weight, per 100 parts by weight of the base material. If the amount added is less than 0.05 parts by weight, breathing and floating of aggregates will occur, resulting in unevenness on the surface of the formed cured body. On the other hand, if it exceeds 3.5 parts by weight, the viscosity is increased and the fluidity is lowered, and the adhesion loss to the inner surface of the apparatus is increased.

The air entrained when the fluidizing agent and the thickening agent are added to the base material and kneaded forms bubbles due to the surface-active action of these additives, so that bubbles are formed on the surface of the formed cured product. -Shaped projections and pinholes that are traces of gas volatilization occur and the surface condition deteriorates. In addition, the compression strength of the cured product formed by curing while containing bubbles is lowered.

The defoaming agent has a function of preventing the occurrence of such a phenomenon, and is of various types such as alcohol type, polyol type, fatty acid ester type, ethylene oxide-propylene oxide type, silicon type and mineral oil type. An antifoaming agent is mentioned, and these can be used alone or in combination of two or more kinds.

The amount of the defoaming agent added varies slightly depending on the kind and combination thereof, but is 0.03 per 100 parts by weight of the base material.
-1 part by weight, preferably 0.05-0.8 part by weight, more preferably 0.08-0.5 part by weight. Addition amount is 0.03
If it is less than 1 part by weight, the traces of bubbles remain in the formed cured product, while if it exceeds 1 part by weight, the defoaming effect does not increase so much.

The aggregate used in the composition of the present invention needs to be fired vermiculite and is an essential component for obtaining the SL material which enables nailing, which is the object of the present invention. When firing vermiculite raw ore is passed through a high-temperature firing furnace, the water contained in the crystal layer is instantaneously vaporized, causing delamination of the raw ore, and rapidly expanding to the original volume. It can be obtained as an accordion-like fired product that is a dozen times more than the above.

The calcined vermiculite used as an aggregate of the composition of the present invention has a maximum particle size of 5 mm or less and a particle size of 5 to 0.1 mm, preferably 2 to 0.1 mm, more preferably 1 to 0.1 mm. Content within the range of 90% by weight
The above is preferable. If a particle having a particle size of more than 5 mm (also referred to as coarse particles) is used, unevenness is likely to occur on the surface of the formed cured body. If the content of the particles having a particle size of less than 0.1 mm (also referred to as fine particles) exceeds 10% by weight, the fluidity of the composition slurry with time decreases and the surface leveling work after casting is reduced. It becomes difficult and unevenness occurs on the surface of the formed cured body.

The amount of the calcined vermiculite added varies depending on the ratio of the gypsum / cement as the base material and the particle size distribution of the calcined vermiculite used, but is in the range of 2 to 15 parts by weight, preferably 3 to 100 parts by weight of the mixture. 13 parts by weight,
More preferably, the range is 4 to 10 parts by weight. Addition amount is 2
If it is less than the weight part, the nail cannot be driven into the formed cured body. On the other hand, if it exceeds 15 parts by weight, the fluidity of the composition slurry is reduced, the compression strength of the formed cured body is reduced, and the surface of the cured body becomes uneven, which is not preferable.

The fiber added to the composition of the present invention is necessary to prevent cracks or splits when a nail is driven into the formed cured product, and the fiber such as glass fiber and alkali-resistant glass fiber is used. Inorganic fibers; organic fibers such as vinylon fibers, nylon fibers and polypropylene fibers can be used alone or in combination of two or more. There is no restriction on the state of the fibers, and any of single fibers, or bundles of single fibers or twisted fibers can be used.

The length of the added fiber is preferably in the range of 3 to 15 mm. If the length is less than 3 mm, cracks and cracks are likely to occur when a nail is driven into the formed cured body. On the other hand, 15 mm
When it exceeds, fibers are projected on the surface of the formed cured body, which is not preferable. Further, when the materials are kneaded, the fibers are easily entangled with each other, so that the fibers are unevenly distributed in the composition, and cracks or cracks are easily generated when a nail is driven into the formed cured body.

The amount of fiber added is preferably in the range of 0.1 to 5 parts by weight, preferably 0.3 to 3 parts by weight, more preferably 0.5 to 1 part by weight, per 100 parts by weight of the mixture. 0.1
If the amount is less than 5 parts by weight, cracks or cracks are likely to occur when a nail is driven into the formed cured body, while if it exceeds 5 parts by weight, fibers project to the surface of the formed cured body, which is not preferable.

If desired, a curing accelerator, a curing retarder, a shrinkage reducing agent, a swelling agent, etc. may be added to the composition of the present invention as additives other than the above.

The amount of water added to obtain the composition of the present invention is 100 parts by weight of a mixture of a base material and a fluidizing agent / thickening agent / antifoaming agent for imparting self-smoothness, or the like.
The preferred range is 40 to 100 parts by weight. The amount of water is 40
When the amount is less than the weight part, the fluidity of the composition slurry is poor, and unevenness is generated on the surface of the formed cured body. Further, if it exceeds 100 parts by weight, material separation is likely to occur, and further, the compression strength of the formed cured body may be deteriorated.

The compressive strength of the cured body formed by total cure flowing a composition of the present invention, 100~200 kg / cm ^2, preferably from in the range of 120~200 kg / cm ^2.
If the compression strength of the cured product is less than 100 kg / cm ² , it cannot withstand the point load to be held on the floor. On the other hand, the compressive strength is 2
If it exceeds 00kg / cm ² , when the nail is driven into the formed hardened body, the nail bends and cannot be driven, or
It is not preferable because the cured product is likely to crack.

In the construction method of the present invention, when the composition of the present invention is cast, the flow value of the composition is 16 to 28 cm.
Must be within the range. If the flow value when casting the composition of the present invention is less than 16 cm, it becomes difficult to smooth the surface of the cast composition, and unevenness is likely to occur on the surface of the formed cured body. On the other hand, the flow value is 2
If it exceeds 8 cm, material separation is likely to occur, and it becomes difficult to hit a nail on the formed cured body, which is not preferable.

Next, examples of the embodiment of the construction method using the composition of the present invention will be shown, but the present invention is not limited thereto.
The composition of the present invention can be obtained in a slurry state by kneading the materials mixed in the quantitative ratio specified in the present invention with a mixer such as a high speed mixer for SL material kneading. The composition slurry thus obtained is cast within a range of the flow value defined in the present invention to a construction site using a mortar pump or the like, leveled using a surface leveling tool such as a register mark, and left to harden.

In the construction method of the present invention, the kneading time when the composition of the present invention is kneaded is preferably within the range of 1 to 10 minutes. When the kneading time is less than 1 minute, the viscosity of the obtained composition slurry is insufficient and material separation is likely to occur, resulting in unevenness on the surface of the formed cured body. On the other hand, if the kneading time exceeds 10 minutes, excessive air is entrained in the composition slurry during the kneading process, and even if an antifoaming agent is added, the defoaming effect is not sufficient, and the surface of the formed cured body is formed. It is not preferable because bubbles are likely to be generated.

[0032]

The present invention will be described in detail below with reference to examples and comparative examples. As long as the present invention does not exceed its gist,
It is not limited to the following examples. Examples 1 to 17 and Comparative Examples 1 to 20. Bone at 100 parts by weight of a mixture obtained by mixing the base material and the SL-forming additive in the amount ratios shown in Table 1 under the conditions and the mixing ratios shown in Table 1. The materials and fibers were added, and water was added and kneaded to obtain various compositions. As the kneading device, a high-speed mixer for SL material kneading (Mazeler Co., Ltd., capacity 90 liters) was used, and the kneading time was 3 minutes each. The composition obtained was cast at a thickness of 20 mm on 3 m ² of the base floor (structural plywood) using a mortar pump at the flow values shown in Table 1, and after 30 minutes, it was evenly left on the register marks. Then, it was naturally cured. In Comparative Example 20, because the flow value was adjusted,
After kneading, the mixture was allowed to stand for 1 hour and then cast. The physical properties and properties of the tested composition and the obtained cured product are shown in Table 1 (a) and
It is shown in (b).

The main materials used in the test are as follows. -Gypsum-Type II anhydrous gypsum-Cement-Ordinary Portland cement-Additive (a) -Fluidizer "SMF-PD" (manufactured by Nissan Chemical Industries, Ltd.)-〃 (b) -Thickener "Dencapovar" (electric (Chemical Industry Co., Ltd.) 〃 (c) ... Antifoaming agent "SN Deformer 14 HP" (San Nopco Co.) ・ Aggregate ... Calcined vermiculite (commercially available) ・ Fiber ... Alkali resistant glass fiber (commercially available)

[0034]

[Table 1]

[0035]

[Table 2]

The methods of measuring or testing each evaluation item shown in Table 1 and the meanings of the symbols in the evaluation item column are as follows:
It is as follows.・ Flow value of the composition slurry ... PVC pipe placed on a horizontally polished glass plate (diameter 50 mm, height 51 mm)
After the sample was filled inside and the spread of the sample was stopped by pulling up the pipe, the diameter in two directions at right angles was measured and expressed as the average value.

Compressive strength of the cured product: According to the test method specified in JIS R5201, the sample is poured into a mold, demolded after curing and cured at 20 ° C and 70% relative humidity for 4 weeks. Uniaxial compressive strength was sometimes measured.

Surface state of cured body: The surface state of the formed cured body was visually and visually observed and judged. ◯: A smooth and good cured body was formed without white flowers, protrusions, traces of bubbles, and protrusion of fibers, and a finished floor surface with good level accuracy could be obtained. ×: Any of poor curing, white sinter, cracks, peeling, unevenness, and protrusion of fibers was observed.

· Nailed state: 3 of the cured body formed
The state when the nail for the flooring material was directly driven into the location was visually and visually observed and judged. ○: The nails that were driven in were not bent, and the cured product did not crack, crack, or chip, and the condition of the cured product was good even when the nail was driven in. ×: The nail was bent or the hardened body was cracked, cracked or chipped.

-Comprehensive evaluation: O ... When the evaluation result of each item is O. ×: When any of the evaluation results of each item is ×.

In each of Examples 1 to 17 tested under the conditions satisfying the requirements of the present invention, there was no white flower / protrusion and traces of bubbles, and no protrusion of the blended fiber, and a smooth and good cured product was formed. A floor surface with a level accuracy of 1/300 or less was obtained. Moreover, when the nail is directly driven into the formed hardened body, the nail that has been driven does not bend, and the hardened body is not cracked, cracked or chipped, and the hardened body is in a good condition even when the nail is driven. It was In addition, in a test in which a flooring material is attached to a hardened body formed under the conditions satisfying the requirements of the present invention, and a nail for fixing is directly driven in, a phenomenon that the flooring material is exposed even after one year or more has passed. Did not occur and good holding power was secured.

On the other hand, when the value is out of the range specified in the present invention, the surface condition of the formed cured product is poor, or when the nail is directly driven, the nail bends, Alternatively, the cured product was cracked, cracked, or chipped, which was not satisfactory. Comparative Examples 1 to 3 were cases in which the sintered vermiculite as an aggregate contained particles having a particle size of more than 5 mm (coarse particles), and protrusions were found on the surface of the formed cured body. In Comparative Examples 4 and 5, the particle size of the aggregated baked vermiculite was 0.1.
When the content of less than mm (fine particles) exceeds 10% by weight,
The composition slurry had a low fluidity with time, and unevenness was generated in the leveling operation after casting and unevenness and bubble marks were also found on the surface of the formed cured body.

In Comparative Examples 6, 7 and 8, the composition ratio of the burned vermiculite as the aggregate is out of the range specified in the present invention. In Comparative Example 7 in which the nail was bent and could not be driven, on the other hand, in the comparative example 7 in which the hardened body formed had a trace of bubbles on its surface and the compressive strength was low, and in Comparative Example 8, the composition slurry The fluidity was lowered, and irregularities were observed on the surface of the formed cured body.

Comparative Example 9 was a case where only the fibers were blended without blending the burned vermiculite as the aggregate, and the formed cured product had an excessive compressive strength, and the nail was bent and could not be driven.

Comparative Example 10 was a case in which no fiber was blended, and the cured product cracked during nailing.

In Comparative Examples 11 and 12, the length of the blended fibers was as short as 2 mm, the cured product cracked when the nail was driven, and in Comparative Example 12, the blending ratio of the fibers was too large.
It was observed that some of the fibers were projected on the surface of the formed cured body. In Comparative Examples 13 and 14, when the blended fibers were too long, it was observed that some of the fibers were projected on the surface of the formed cured body. Furthermore, Comparative Example 1
In 3, the fibers were unevenly distributed, so the hardened body broke when the nail was driven in.

Comparative Example 15 is a case where the amount ratio of the materials specified in the present invention was out of the range other than the compounding ratio of water, unevenness and bubble marks were generated on the surface of the formed cured body, and further, It was observed that some of the fibers were protruding, and the compression strength of the cured product was low.

Comparative Example 16 is a case where the blending ratio of water is lower than the specified range, the flow value of the composition slurry is small, and it is difficult to cast the composition slurry. Traces were seen, and the cured product cracked when nailing. In Comparative Examples 17 and 18, when the blending ratio of water was higher than the specified range, material separation occurred, the baked vermiculite floated on the surface of the composition slurry, and unevenness was generated on the surface of the formed cured body. Further, in Comparative Example 17, the baked vermiculite was unevenly distributed in the upper layer portion of the formed cured body, and the lower layer portion of the cured body was cracked during nailing.

Comparative Example 19 was a case in which neither the burned vermiculite nor the fiber was mixed, and the nail could not be driven into the formed cured body, and the nail was bent in the middle.

In Comparative Example 20, the compounding ratio of each material was within the range specified in the present invention, but the flow value of the composition slurry was out of the specified range because the elapsed time after kneading was excessive. As a result, it was difficult to cast the slurry and level the work with the register marks, and unevenness was observed on the surface of the formed cured body.

[0051]

The present invention has the following effects. 1) It is possible to easily obtain a good finished floor surface with no white spots, protrusions, and air bubbles, and a smooth and good cured body that is free of compounded fibers and has a level accuracy of 1/300 or less. In addition, nails for the flooring material could be directly driven into the formed hardened body, preparatory work for nailing was unnecessary, and work efficiency could be greatly improved. 2) Compared with conventional wettable materials that can be nailed, the workability of casting and casting is greatly improved, and a finished floor surface with good level accuracy can be easily obtained. It has become possible to greatly reduce labor and stabilize the quality of the finished floor surface.

Claims (3)

[Claims] 1. An aggregate and water are added to a mixture prepared by mixing gypsum or / and cement as a base material with a fluidizing agent, a thickener, and an antifoaming agent, and kneading. In the self-smoothness composition, the maximum particle size of the aggregate per 100 parts by weight of the mixture is 5 mm or less, and the particle size is 0.1 mm.
2 to 15 parts by weight of burned vermiculite having a content of less than 10% by weight and a length of 3
Fibers within the range of ~ 15 mm in the range of 0.1-5 parts by weight,
A self-lubricating composition capable of nailing, which is characterized by being blended. 2. The mixture comprises, per 100 parts by weight of the substrate, a fluidizing agent in the range of 0.1 to 5 parts by weight, a thickener in the range of 0.05 to 3.5 parts by weight, and a range of 0.03 to 1 part by weight. The self-lubricating composition according to claim 1, which is obtained by mixing an antifoaming agent. 3. When applying the composition according to claim 1, water is added in the range of 40 to 100 parts by weight per 100 parts by weight of the mixture, and the mixture is kneaded. A method for applying a nailable self-smoothness composition, which comprises casting and curing when the value is in the range of 16 to 28 cm.