JPS63110267A - Water-proofing material composition - Google Patents

Abstract

PURPOSE:To obtain the titled composition giving a water-proofing layer having excellent watertightness and useful for the treatment of cement mortar, concrete construction, etc., by compounding a polymer emulsion with an inorganic substance containing a calcium aluminate compound and an inorganic sulfuric acid salt as essential components. CONSTITUTION:The objective composition can be produced by compounding (A) 100pts.wt. of a solid resin component of a polymer emulsion (preferably a polymer having a glass transition temperature of -30-+15 deg.C, e.g. ethylene- vinyl acetate copolymer emulsion) with (B) 2-200pts.wt., preferably 20-150pts. wt. of an inorganic substance containing a calcium aluminate compound (preferably having a CaO content of 38-50wt%) and an inorganic sulfuric acid salt (preferably type II gypsum anhydride) as essential components. The ratio of the calcium aluminate compound to the inorganic sulfate is preferably 1:(1-3).

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a waterproof material composition used in cement mortar or concrete structures in the field of civil engineering and construction.

[Conventional technology and its problems]

BACKGROUND ART Conventionally, in the field of civil engineering and construction, it has been well known that polymer emulsions or rubber latexes are used alone or in combination with cement, etc., for the purpose of imparting waterproof properties to cement mortar or concrete structures.

For example, there is a method of applying a polymer emulsion alone to the surface of cement mortar or concrete structures to make them waterproof. It requires extensive coating work, and the resulting paint film also needs to be adequately protected! There was a problem with it being female.

In addition, due to the occurrence of drying shrinkage cracks, which is a fateful phenomenon of cement mortar or concrete, the paint film is cut,
There was also the problem that a sufficient waterproof effect could not be obtained.

Therefore, waterproof material compositions made by mixing this polymer emulsion and cement have been proposed, but the waterproof layers obtained from these compositions are insufficiently watertight, and are difficult to prevent cracks in the underlying concrete. However, like the above-mentioned method, this method had the disadvantage of not exhibiting a waterproofing effect. Further, there were other problems, such as the slow curing of the cement and the fact that it took a long time to cure, and the waterproof layer itself contracted (for example, Japanese Patent Publication No. 47-33054).

[Means for solving problems]

As a result of intensive studies to solve the current problems related to waterproofing material compositions, the present inventors have completed the waterproofing material composition of the present invention by combining a polymer emulsion and a specific inorganic substance in a specific ratio. .

That is, in the present invention, the solid content of the polymer emulsion resin is 100
It is a waterproof material composition consisting of 2 to 200 parts by weight of an inorganic substance containing calcium aluminates and inorganic sulfates as essential components.

The present invention will be explained in detail below.

The polymer emulsion resin solid content used in the present invention is:
When applied to cement mortar or concrete structures, a film is formed by evaporation of water, and this film is insoluble or poorly soluble in water.

For example, natural rubber latex (NR), styrene-butadiene polymers (EBR, SBR, SB, H3,
PS), acrylonitrile-butadiene copolymer (NB
R), methyl methacrylate-butadiene copolymer (M
BR), polychloroprene (CR), vinylpyridine copolymer (VP), polyisoprene (IR), butyl rubber (IIR), polyurethane (U), polybutene (P)
IB), polyacrylate (AR, AM), vinyl chloride polymer (PVC), vinyl acetate polymer (PVAc)
), vinylidene chloride copolymer (PVdC), polyethylene (r'E), and vinyl acetate-ethylene copolymer (EVA) as a polymer component. Among these, the glass transition temperature of the polymer is 130~
A temperature within the range of 15° C. is preferable in terms of adhesive strength and flexibility of the coating film.

As a type of polymer, ethylene/vinyl acetate copolymers are preferred in the same sense as above, and among them, ethylene/vinyl acetate copolymers having a polymer composition of ethylene/vinyl acetate = 10 to 40/90 to 60 (weight ratio) Particularly preferred is a vinyl copolymer emulsion resin solid content.

Calcium aluminates used in the present invention are usually
Calcium aluminate minerals produced at high temperatures in electric furnaces, rotary kilns, etc. can be used regardless of whether they are crystalline or glassy, and the presence of other components and impurities in the production process is not particularly limited. It's not something you can do.

Representative crystalline calcium aluminate minerals include CaO' 2 A 1203 (hereinafter referred to as CAZ), CaO・A (1203 (hereinafter referred to as CA),
5Ca (138f ZO3 (hereinafter referred to as C5A), 1
2CaO・786z (h (hereinafter referred to as CIZA7) and 3CaO・A l zoo (hereinafter referred to as CffA)
, etc. as well as other components are present in the crystal 11
CaO-7A J ZO: l -CaXz (X represents halogen), 4Ca (l^' 203 ' FezO
, and 3 Ca0 ・3 A I! z(h' Ca
Examples include SO4.

A typical glassy calcium aluminate mineral is compositionally the same as a crystalline mineral, but it is vitrified by rapid cooling, and its mineral composition cannot be specified.

From the viewpoint of reactivity, glassy ones are preferable to crystalline ones, and from the viewpoint of composition, calcium aluminates with a CaO content of 30 to 60% by weight are preferred, and 38 to 50% by weight. Particularly preferred are those.

In the present invention, one or more of the above calcium aluminates can be used.

The inorganic sulfates used in the present invention refer to sulfates of alkali metals or alkaline earth metals, and preferable examples include anhydrous, hemihydrous, and double calcium sulfates. Particularly preferred are those that are poorly soluble or insoluble.

The usage ratio of calcium aluminate i and inorganic sulfate is preferably 1:0.5 to 5 in terms of weight ratio;
: Particularly preferred are those of 1 to 3.

The inorganic substance referred to in the present invention is calcium aluminate t.
(1) and an inorganic sulfate as essential components, and further consisting of a hydraulic substance and/or a latent hydraulic substance.

As the hydraulic substance, Portland cement, super quick-hardening cement, or calcium silicates are used.
Pozzolans such as granulated blast furnace slag, fly ash, or silica hume are used as the latent hydraulic substance.

The amount of essential components in the inorganic substance is not particularly limited, but 5
-40% by weight is preferred, and 10-30% by weight is particularly preferred.

Incidentally, when a hydraulic substance and a latent hydraulic substance are used in combination in the inorganic substance, the ratio of their combined use is not particularly limited.

Embodiments of typical combinations of the inorganic substances are as follows.

■ Calcium aluminate, ■ Type anhydrite, ordinary Portland cement ■ Calcium aluminate, ■ Type anhydrite, granulated blast furnace slag ■ Calcium fluoroaluminate, calcium sulfate, calcium silicate (ultra-fast hardening cement containing the above three components) (corresponds to this) ■ Ultra-fast hardening cement, fly ash The waterproof material composition of the present invention contains 2 parts of an inorganic material containing calcium aluminates and inorganic sulfates as essential components, based on 100 parts by weight of solid content of the polymer emulsion resin. -200 parts by weight, and particularly preferably 20-150 parts by weight.

If the amount of the inorganic substance is less than 2 parts by weight, the drying properties of the coating film will be poor, and if it exceeds 200 parts by weight, the flexibility of the coating film will be poor and the ability to deal with cracks etc. will be reduced.

In addition, the waterproof material composition of the present invention includes a setting regulator, an antifoaming agent,
It can contain thickeners, dispersants, aggregates such as silica sand and natural sand, and fibrous substances such as glass fibers and steel fibers.

In the composition of the present invention, the respective materials may be mixed at the time of construction, or some or all of the materials may be mixed in advance.

The waterproof material composition of the present invention can be applied using a plastering trowel, a brush, or spraying as used in -M, and the thickness is usually 0.1 to
It is 5-o. Incidentally, it is preferable that the applied waterproof coating film is provided with a protective layer.

The waterproofing material composition of the present invention can be applied to the rooftops, walls, balconies, washrooms, bathrooms, water tanks, heat storage tanks, and even the inner and outer walls of basements of civil engineering and building structures.

〔Example〕

Hereinafter, the present invention will be explained in detail with reference to Examples.

Example 1 A waterproof material composition having the formulation shown in Table 1 was prepared using the materials shown below.

- Polymer emulsion resin solid content A; ethylene/vinyl acetate copolymer emulsion rMf content 55%, ethylene/vinyl acetate = 30770,
Glass transition temperature 20°C B: Ethylene/vinyl acetate copolymer emulsion solid content 55%, ethylene/vinyl acetate -20/80, glass transition temperature 0°C Cn SBR copolymer emulsion solid content 45%, Crossrene manufactured by Narita Pharmaceutical Co., Ltd. CMX-D Niacrylic acid ester copolymer emulsion solid content 45%,
Ultrasol CMX-43 manufactured by Narita Pharmaceutical Co., Ltd. Mobile material E; Calcium aluminates (essential components) Ca045
Weight%, glassy, Blaine specific surface area 6500cffl
/g F: ■-type anhydrite (essential component) Blaine specific surface area 6100 cal/g G: Ordinary Portland cement manufactured by Denki Kagaku Kogyo Co., Ltd. H: Granulated blast furnace slag Blaine specific surface area 4050 cal/g I: Fly ash Blaine ratio Surface area 3450 c+a/gJ: Ultra-fast hardening cement 11 Ca0 ・7A l 203 ・Contains CaFz, calcium sulfate, calcium silicate, jet cement manufactured by Onoda Cement Co., Ltd. ・For other materials: Setting regulator Kosmisoku Magnetic 1 Setter manufactured by Denki Kagaku Kogyo Co., Ltd. L: a Setting regulator: Onoda Cement Co., Ltd. Jet Setter M Near No. silica sand Adhesiveness, zero span elongation, of the resulting waterproofing material composition;
Water permeability and crank occlusion were measured by the following measuring methods, and the results are shown in Table 1.

・Measurement method (Curing conditions: temperature 20℃, humidity 65%R, H
,) a) Apply 2 parts of the waterproof material composition to the adhesive mortar board (7X7X2CJ11).
The adhesive strength was measured by flat tension after 28 days.

b) Zero span elongation The waterproofing material composition was applied to a U-shaped cut slate board (5 x 15 cm) to a thickness of 2 cranes, and after 28 days the tensile speed was 0.
．． The coating was pulled at 51111/min until it broke and the zero span elongation was measured.

C) A waterproof material composition was applied to a water-permeable mortar board (diameter 15 cm, thickness 4 ca+) to a thickness of two cranes, and after 28 days, a water pressure of 3 kg/- was applied for 6 hours to measure the amount of water permeation.

d) Crack-occlusion The waterproof material composition was applied to a slate board (5 x 10 cm) to a thickness of 2 mm, and after 28 days, a hole with a diameter of 1 mm was made to prepare a test piece. Subsequently, after immersing the test piece in water for 24 hours, a PVC pipe with a diameter of 1 cm was glued so that the hole part was located in the center of the pipe, and water was poured into the pipe.
We observed whether the water in the hole had stopped. Those with no water leakage and those with O1 water leakage are marked with an x.

From Table 1, the test results of test magnets 1 to 11, which are examples of the present invention, were all satisfactory, whereas ordinary portland cement alone as an inorganic substance (test number 12) showed no cracks. The granulated blast furnace slag alone (Test No. 13) was inferior in water permeability and crank occlusion, and the polymer emulsion resin solid content alone (Test N114) had poor adhesion and crank occlusion. The result was that it was inferior in terms of occlusion.

〔Effect of the invention〕

By using the waterproof material composition of the present invention, a dense and high-quality waterproof coating film was obtained with a speed that was not possible with conventional construction methods.

The resulting coating film has little shrinkage due to its own drying.
It was sufficiently resistant to peeling and drying shrinkage cracking of the underlying concrete, forming a stable waterproof layer over a long period of time.

Patent applicant Denki Kagaku Kogyo Co., Ltd. Procedural amendment (voluntary) April 6, 1988 Commissioner of the Patent Office Kuro 1) Akio Yu Tono 3. Person making the amendment Relationship to the case Patent applicant address ■100 Chiyoda-ku, Tokyo In the detailed description of the invention in the specification of Yurakucho 1-4-1 (Leap 5, Contents of Amendment (1), page 9, lines 5 and 6, it is written that each material in Table 1 is The blending amount is shown in parts by weight.'' is inserted.

(2) Delete "Resin solid content" on page 9, line 6.

(3) "Glass transition temperature 20°C" on page 9, line 10 is corrected to "glass transition temperature -20°C".

Claims (1)

[Claims] A waterproof material composition comprising 2 to 200 parts by weight of an inorganic substance containing calcium aluminates and inorganic sulfates as essential components, based on 100 parts by weight of solid content of a polymer emulsion resin.