JP4147413B2 - Water absorption prevention material - Google Patents

Description

  The present invention relates to a water absorption preventing material.

  Conventionally, as a water absorption preventive material used for inorganic building materials such as outer wall panels, slate, bricks, concrete blocks, cement tiles or concrete structures, silicone water repellent; water glass was added to silicone water repellent A thing (for example, refer patent document 1); Acrylic paint containing silicone type water repellent (for example, refer patent document 2); Water-soluble silicate, synthetic resin emulsion, paint containing water repellent and pigment Compositions (for example, see Patent Document 3) and the like are known, and these materials are used to form inorganic building materials, particularly inorganic molded bodies having water absorption (for example, calcium silicate board, cement board, gypsum). A small edge of an inorganic building material in which a protective sheet (eg, paper, plastic sheet, metal film, etc.) is laminated on a plate (cross-section without a protective sheet) When subjected to waterproof treatment, can not be sufficiently suppressed curling up of the protective sheet edge, reduction of water resistance due to water absorption from the portion such as curling has become a problem.

  In addition, among the above water absorption preventing materials, those of solvent type are concerned about problems such as environmental pollution, and it is necessary to solve these problems.

  More specifically, as an inorganic building material in which a protective sheet is laminated on the inorganic molded body having water absorption, for example, a mold used for concrete slab construction such as floor slabs, columns, beams, walls of concrete structures, etc. There are frame and heat insulating materials, gypsum boards, veneered inorganic decorative boards, and the like. As the mold and heat insulating material, for example, there is a mold and heat insulating material made of calcium silicate (see, for example, Patent Document 4). . In this formwork and heat insulating material, a protective sheet (so-called face material) is laminated on the surface in contact with the concrete and the surface on the opposite side for the purpose of waterproofing and reinforcement.

  However, when the above-mentioned heat insulating material is cut and used at the construction site, the protective sheet follows the cutting tool (cutter, etc.) during the cutting process, so that the edge of the protective sheet is rolled or the protective sheet is peeled off. . There is a problem that the strength of the heat insulating material for both the formwork and the heat insulation performance deteriorates due to the intrusion of moisture from the curled portion, cut surface or side surface (small edge) of the protective sheet.

For this reason, at present, as shown in FIG. 1, the waterproof adhesive tape is stuck to the forehead to prevent water absorption and the protective sheet from being peeled off, but the waterproof adhesive tape is stuck to the forehead. Since the work is complicated, the construction efficiency of the heat insulating material for both the formwork is extremely deteriorated, and further improvement measures are desired.
Japanese Patent Laid-Open No. 51-126986 JP 59-65147 A Japanese Unexamined Patent Publication No. Sho 63-310782 Japanese Patent Laid-Open No. 11-247341

  A main object of the present invention is to provide a water-absorbing prevention material excellent in waterproofing treatment of inorganic building materials, in particular, water-proofing treatment of small openings in inorganic building materials in which a protective sheet is laminated on an inorganic molded body having water absorption. .

  As a result of intensive studies, the present inventor has found that the above object can be achieved by using a composition having a specific component, and has completed the present invention.

  That is, the present invention relates to the following water absorption preventing material.

  1. (1) A water absorption preventing material comprising an aqueous composition comprising at least one selected from the group consisting of paraffins and rosins, (2) silicone, and (3) an acrylic resin.

  2. The water absorption preventing material according to Item 1, comprising 3 to 50 parts by weight of silicone and 10 to 250 parts by weight of at least one selected from the group consisting of paraffins and rosins with respect to 100 parts by weight of the acrylic resin.

  3. Item 3. The water absorption preventing material according to Item 1 or 2, which is used for applying to an inorganic building material.

  4). A protective sheet is laminated on a part or all of an inorganic molded body in which the inorganic building material has water absorption, and a region including at least the end of the protective sheet and the inorganic molded body is applied to the inorganic building material. Item 4. The water absorption preventing material according to Item 3, which is used for the purpose.

  5. Item 5. The water absorption preventing material according to Item 3 or 4, wherein the inorganic building material is a heat insulating material also used as a formwork.

  6). Item 4. The water absorption preventing material according to Item 3, wherein the inorganic building material is calcium silicate.

  7. Item 5. The water absorption preventing material according to Item 4, wherein the inorganic molded body is calcium silicate.

  8). An inorganic building material, wherein the water absorption preventing material according to item 1 or 2 is applied.

  9. Item 9. The inorganic building material according to Item 8, wherein the inorganic building material has a protective sheet laminated on part or all of the inorganic molded body having water absorption.

  10. Item 10. The inorganic building material according to Item 8 or 9, wherein the inorganic building material is a formwork and heat insulating material.

  11. Item 9. The inorganic building material according to Item 8, wherein the inorganic building material is calcium silicate.

  12 Item 10. The inorganic building material according to Item 9, wherein the inorganic molded body is calcium silicate.

  According to the water absorption preventing material of the present invention, in the inorganic building material in which the protective sheet is laminated on a part or all of the inorganic molded body, the water absorption preventing material of the present invention is applied to the region including the protective sheet end and the inorganic molded body. By this, the protective sheet adheres well to the inorganic molded body by the coating film, and it is possible to prevent the edge from the end of the protective sheet. Thereby, the fall of the intensity | strength of the inorganic type construction material by the penetration | invasion of the water | moisture content from the drooping part of a protection sheet, the fall of heat insulation performance, etc. can be prevented.

  Since the water absorption preventive material of the present invention is composed of an aqueous composition, environmental pollution by volatile organic solvents can also be avoided.

  Furthermore, according to the present invention, it is only necessary to apply the water absorption preventive material of the present invention to the forehead, so that the trouble of applying a waterproof adhesive tape can be saved. In particular, when the water absorption preventive material of the present invention is applied to a mold and heat insulating material, the construction efficiency can be greatly improved.

  Moreover, when the water absorption preventing material of the present invention is applied to a general inorganic building material on which a protective sheet is not laminated, excellent waterproof performance is exhibited.

1. Water-absorbing preventive material of the present invention The water- absorbing preventive material of the present invention comprises an aqueous composition containing (1) at least one selected from the group consisting of paraffins and rosins, (2) silicone, and (3) an acrylic resin. It is characterized by.
(1) Paraffins or rosins As the paraffins, alkanes represented by the general formula: C _n H _{2n + 2} (n = 1 to 70, preferably 15 to 70) can be used. Among these, when blended with the water absorption preventing material of the present invention, a stable material that does not separate from the solidified product at room temperature when the water absorption preventing material is applied and solidified (film formation) is preferable. Such paraffin is commercially available, and since the emulsion type is aqueous, it can be suitably used.

  As rosins, rosins and rosin esters extracted from Pinaceae plants can be used, and commercially available aqueous emulsion types such as rosin ester emulsions can be suitably used.

In the present invention, at least one selected from the group consisting of the above paraffins and rosins can be used. When paraffins are used, the amount is about 10 to 200 parts by weight, preferably about 25 to 150 parts by weight with respect to 100 parts by weight of acrylic resin. When rosins are used, 100 parts by weight of acrylic resin is used. The amount may be about 25 to 250 parts by weight, preferably about 50 to 200 parts by weight.
(2) Silicone As the silicone used in the water absorption preventing material of the present invention, aqueous siliconate, silane, and siloxane oligomer silicones can be used, and siliconate silicones can be particularly preferably used. As a siliconate-type thing, at least 1 type chosen from the group which consists of a trialkoxysilane, the hydrolyzate of trialkoxysilane, and the metal salt of trialkoxysilane, for example can be used. As trialkoxysilane, the following general formula (1):
R ¹ Si (OR ² ) ₃ (1)
[Wherein, R ¹ represents a methyl group, an ethyl group, a phenyl group, a trifluoropropyl group, or a heptadecatrifluoropropyl group, and R ² represents a methyl group or an ethyl group. The trialkoxysilane represented by these can be used.

  The trialkoxysilane hydrolyzate refers to, for example, a compound in which the alkoxy group of the trialkoxysilane is hydrolyzed under alkaline conditions, and the number of alkoxy groups to be hydrolyzed is not limited. Examples of trialkoxysilane metal salts include lithium salts, sodium salts, potassium salts, and the like, with sodium salts being preferred. Specifically, sodium methylsiliconate can be suitably used, and commercially available products can be used.

The water absorption preventing material of the present invention may contain about 3 to 50 parts by weight, preferably about 5 to 20 parts by weight of silicone with respect to 100 parts by weight of the acrylic resin.
(3) Acrylic resin As an acrylic resin, the acrylic resin generally used for an adhesive etc. can be used. For example, methyl (meth) acrylate, ethyl (meth) acrylate, propyl (meth) acrylate, butyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, dimethylaminoethyl (meth) acrylate, diethylaminoethyl (meth) acrylate, di Propylaminoethyl (meth) acrylate, dimethylaminopropyl (meth) acrylamide, diethylaminopropyl (meth) acrylamide; a copolymer of at least one of these monomers; and these monomers and an acrylate ester, Those obtained by copolymerization with ethylenically unsaturated monomers such as acrylonitrile, styrene and vinyl acetate can be used. The manufacturing method of an acrylic resin is not specifically limited, It can manufacture by well-known methods, such as emulsion polymerization, suspension polymerization, or solution polymerization.

In the present invention, an aqueous emulsion of an acrylic resin can be particularly preferably used. The aqueous emulsion of an acrylic resin is not specifically limited, A well-known thing or a commercial item can be used.
(4) Solvent The water absorption preventive material of the present invention comprises an aqueous composition. That is, the solvent includes water or an aqueous solvent. As the aqueous solvent, for example, a mixed solution of water and a water-soluble organic solvent can be used. In addition, when an aqueous emulsion is used as the component, a solvent need not be added separately. The usage-amount of a solvent can be suitably determined according to the kind of other component, workability | operativity at the time of application | coating, etc.
(5) Additive In the present invention, an additive can be used as necessary to add further properties to the water absorption preventing material. Examples of additives include water glass, pigments, film-forming aids, thickeners and antifoaming agents.

  Water glass is used for reasons such as enhancing the adhesion to concrete, and can be appropriately selected according to the required performance with respect to the silicone in the water absorption preventing material, but usually 1 to 9 times the amount of silicone What is necessary is just to add a grade.

  Although the compounding quantity of an additive can be suitably selected in the range which does not impair the performance of a water absorption preventive material, it is good to contain normally about 0 to 20 weight% in a water absorption preventive material.

2. The material to which the water absorption preventing material of the present invention is applied The water absorption preventing material of the present invention is applied to inorganic building materials including inorganic molded bodies having water absorption made of, for example, calcium silicate plate, cement plate, gypsum plate, etc. In particular, in an inorganic building material in which a protective sheet is laminated on a part or all of an inorganic molded body having water absorption, it is preferably used to apply at least a region including the end of the protective sheet and the inorganic molded body. It is done. It does not specifically limit as a use of the said inorganic type building material, For example, it can be used conveniently for a formwork combined heat insulating material. As such a thing, the heat insulating material for formwork shown by the said patent document 4 corresponds. Hereinafter, the calcium silicate molded object used for an inorganic type building material (especially heat insulating material used also as a formwork) and the protective sheet laminated | stacked on a calcium silicate molded object are demonstrated.

(I) Calcium silicate molded body A known method can be applied to the method for producing a calcium silicate molded body, and the size, shape, etc. of the molded body are not limited and can be appropriately selected. In order to sufficiently exhibit the strength as a mold, it is generally preferable that the density of the molded body is about 0.05 to 0.30 g / cm ³ .

(B) Protection sheet (face material)
(1) Protective sheet laminated on the surface in contact with concrete As the protective sheet laminated on the surface in contact with concrete of the molded body, for example, a laminate including a reinforcing layer and / or a moisture / waterproof layer is used. can do.

Any reinforcing layer may be used as long as it has a reinforcing effect such that the bending strength of the heat insulating material for formwork is about 20 kgf / cm ² or more and has good adhesion to the molded body and concrete. For example, paper such as asbestos paper, calcium carbonate paper, aluminum hydroxide paper, magnesium silicate paper, calcium silicate paper, craft paper, liner paper, water-resistant kraft paper, water-resistant liner paper; non-woven fabric such as polyester nonwoven fabric and glass nonwoven fabric Can be used. The thickness of the layer is not limited and can be appropriately selected.

  In view of the fact that the adhesive used in the integrated processing of the mold and heat insulating material and the protective sheet is less likely to pass through when manufacturing the mold and heat insulating material, paper is preferable. You may use what gave these the flame-retardant process as needed.

  As the moisture-proof / water-proof layer, a water-impermeable synthetic resin film such as a polyethylene film, a polyethylene terephthalate film, or a polypropylene film; a metal foil such as an aluminum foil, an iron foil, or a stainless steel foil can be used. The thickness of the layer is not limited and can be appropriately selected.

  Since the reinforcing layer has better adhesion between the molded body and the concrete, the three-layer face material of reinforcing layer / moisture / waterproof layer / reinforcing layer is used in the heat insulating material for formwork of the present invention. Is preferred. Further, when the face material is composed of two layers, a reinforcing layer and a moisture / waterproof layer, the reinforcing layer may be on the concrete side from the viewpoint of adhesion to concrete.

  Here, the face material composed of two layers or three layers is illustrated, but as long as the effect as the face material is not impaired, a multi-layer structure in which one or both of a reinforcing layer and a moisture-proof / water-proof layer are stacked may be used. .

  In the protective sheet, the layers may be integrated by an adhesive, the layers may be integrated by heating, or may be integrated by coating or laminating.

(2) Protective sheet laminated on the surface not in contact with concrete As the protective sheet laminated on the other surface not in contact with concrete, the same sheet as the sheet exemplified in (1) above is used. be able to.

  Moreover, it is also possible to use a protective sheet different from the face material exemplified in (1). In that case, a reinforcing layer using a woven fabric of inorganic fibers such as glass cloth, carbon fiber cloth, alumina fiber cloth; and the above-mentioned papers, or these papers, if necessary, flame-retardant treatment, waterproofing ( A surface material is obtained by laminating at least one layer of a moisture permeable and waterproof layer obtained by performing a process such as water repellency treatment or coloring, or by integrating a moisture permeable plastic film such as nylon or EVA with the film. Can do.

  When such a layer is used to form two layers, it is preferable to first integrate the reinforcing layer directly into the molded body with an adhesive or the like, and then laminate the moisture permeable waterproof layer. This is because the binding force of the reinforcing material fibers is transmitted to the molded body, and a desired reinforcing effect is obtained.

  Here, a sheet composed of two layers or three layers is exemplified, but a multilayer structure in which one or both of a reinforcing layer and a moisture permeable waterproof layer are stacked may be used as long as the effect as a protective sheet is not impaired. .

  In the protective sheet, the layers may be integrated by an adhesive, the layers may be integrated by heating, or may be integrated by coating or laminating.

  In the present invention, as the protective sheet, a commercially available sheet can be used, and for example, a known sheet described in Patent Document 4 can be used.

  The mold / heat insulating material suitably used in the present invention may be applied with an adhesive and laminated with a protective sheet after the calcium silicate molded body is easily treated by a sealer treatment. Moreover, you may use the commercial item by which the protective sheet was laminated | stacked beforehand.

3. Construction by the water absorption preventing material of the present invention In the present invention, the method of applying the water absorption preventing material is not limited, and it can be applied by a conventional method such as spraying, roller coating, brush coating or the like. The application may be performed only once, but may be performed a plurality of times.

  The water absorption preventing material of the present invention can be applied to any inorganic building material including a water-absorbing inorganic molded body made of calcium silicate board, cement board, gypsum plate or the like. In particular, in an inorganic building material in which a protective sheet is laminated on part or all of a water-absorbing inorganic molded body, it is preferably used for applying at least the end portion of the protective sheet and the region including the inorganic molded body. That is, when applying the water absorption preventing material of the present invention, particularly in an inorganic building material in which a protective sheet is laminated on a part or all of the inorganic molded body, a region including at least the end portion of the protective sheet and the inorganic molded body. Can be applied.

  For example, as shown in FIG. 2, when a protective sheet (face material) is laminated on the upper bottom surface and / or the lower bottom surface of a rectangular parallelepiped inorganic molded body, a schematic diagram of a cross section at a broken line portion AA ′ in FIG. 2. The figure is shown in FIG. In FIG. 3, the protective sheet 2 is laminated | stacked on the upper bottom face and the lower bottom face of the inorganic molded object 1, respectively, and the coating film 4 by a water absorption prevention material is formed in the area | region containing the edge part 3 and the inorganic molded object 1 of a protective sheet. To do. In this case, a water absorption preventing material may enter the gap between the inorganic molded body 1 and the protective sheet 2.

  Thereby, as a result of effectively preventing the protective sheet from curling from the end portion, it is possible to prevent water from entering.

  The present invention includes any inorganic building material obtained by the above application. That is, an inorganic building material in which a protective sheet is laminated on part or all of an inorganic molded body having water absorption, and the water absorption preventing material of the present invention is applied to at least the end portion of the protective sheet and the region including the inorganic molded body. Inorganic building materials are also included, and inorganic building materials on which the protective sheet coated with the water absorption preventing material of the present invention is not laminated are also included. Each of these components can be as described above. As an inorganic building material of the present invention, for example, a heat insulating material also used as a mold can be mentioned.

  Hereinafter, the present invention will be described in more detail with reference to examples. However, the present invention is not limited to these examples.

Examples 1 to 3 and Comparative Example 1
(1) Materials Used As an inorganic building material, a product name “Dannet Light-II Funen” (size 1820 mm × 910 mm × 50 mm) manufactured by Nippon Insulation Co., Ltd., which is a heat insulating material for molds made of calcium silicate. The rectangular parallelepiped was used. Dunnet Light-II Funen (hereinafter abbreviated as “DNL-II Funen”) has a protective sheet (hereinafter referred to as a face material) bonded to the upper and lower surfaces of the calcium silicate plate. .

  As the face material, polyethylene processed kraft paper was used on the side in contact with the concrete, and glass cloth bonded craft paper was used on the side not in contact with the concrete. Moreover, the said calcium silicate board is not water-repellent processed.

DNL-II funen was cut into 200 mm × 100 mm × 50 mm. At this time, the air dry weight (g) immediately after cutting was measured (this weight is defined as “M”). Next, each of the water absorption preventing materials shown in Table 1 was applied to DNL-II funen to prepare test specimens. The coating amount was 500 g / m ² . As shown in the black part of FIG. 2, the application area was an area extending from the edge of the face material to 2 mm in addition to the edge (side surface).

After applying the above water absorption preventing material such as a water absorption test, it was left to air dry in a room of about 20 ° C. for 24 hours, and the weight immediately before the start of the water immersion experiment was measured (this weight is referred to as “M ₀ ”). ). Further, each DNL-II funnel was put into a water tank (fixed so that the topmost part was about 4 cm below the surface of the water), and the weight after being immersed in water (about 20 ° C.) for 24 hours was measured. “M _t ”). The water absorption was calculated according to the following formula. The results are shown in Table 1.

Water absorption rate (% by weight) = [(M _t −M ₀ ) / M] × 100

Furthermore, after the above-mentioned underwater immersion experiment, whether or not the face material is curled, when sliding it upward or downward while pressing the belly of the finger against the small face (side surface) where the face material is not laminated, The edge of the face material was inspected to see if it was scooped. The results are shown in Table 1.

Reference example 1
As shown in the shaded area in FIG. 1, a test specimen was prepared by covering the small edge surface (side surface) of DNL-II funnel with a waterproof adhesive tape (manufactured by Teraoka Seisakusho; paper adhesive tape No. 200). The same test as in Example 1 was performed. The results are shown in Table 1. The area treated with the waterproof adhesive tape is the shaded area in FIG. 1 as in FIG. 2, and the area from the edge of the face material to 12.5 mm was covered with the waterproof adhesive tape. In addition, the water absorption prevention material is not used.

Comparative Example 2
The experiment was performed in the same manner as in Example 1 except that DNL-II funene was used untreated. The results are shown in Table 1.

  In addition, the component used in Table 1 is as follows.

  As the silicone, “Dry Seal E” (sodium methylsiliconate) manufactured by Toray Dow Corning Silicone Co., Ltd. was used.

  As the acrylic resin, “KT3939C” (acrylic ester copolymer emulsion) manufactured by Etec Co., Ltd. was used.

  As the paraffin, “EMUSTAR-0135” (paraffin wax emulsion) manufactured by Nippon Seiwa Co., Ltd. was used.

  As the rosins, “Super Ester E-720” (rosin ester emulsion) manufactured by Arakawa Chemical Industries, Ltd. was used.

It is a schematic diagram at the time of sticking a waterproof adhesive tape to the heat insulating material for molds (DNL-II funen). It is a schematic diagram at the time of apply | coating a water absorption preventive material to the heat insulating material for molds (DNL-II funen). It is sectional drawing in broken-line part AA 'of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Inorganic molded object 2 Face material 3 Face material edge part 4 Coating film

Claims (3)

It is a formwork combined heat insulating material,
  The heat insulating material for mold form is a protective sheet laminated on part or all of the inorganic molded body having water absorption, and at least the end of the protective sheet of the heat insulating material for mold form and the inorganic molded body, A type in which a water absorption preventing material comprising at least one selected from the group consisting of (1) paraffins and rosins, (2) silicone and (3) an aqueous composition containing an acrylic resin is applied to a region containing Frame and heat insulation. The mold according to claim 1 , wherein the water absorption preventing material contains 10 to 250 parts by weight of at least one selected from the group consisting of 3 to 50 parts by weight of silicone and paraffins and rosins with respect to 100 parts by weight of the acrylic resin. Combined insulation . The heat insulating material combined with a mold according to claim 1 or 2 , wherein the inorganic molded body is calcium silicate.

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