JPS63159245A - Mortar composition - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a mortar composition that is used in the field of civil engineering and construction, particularly as a waterproofing agent, a protective agent for a frame, an adhesive, and the like.

[Prior Art] Inorganic waterproofing agents mainly based on cement include waterproofing mortar made by adding sodium silicate, calcium chloride, etc. to ordinary sand mortar, and inorganic coated waterproofing mortar using pozzolanic reaction. Also, a polymer cement mortar prepared by blending Portland cement with a suitable aggregate, a synthetic polymer emulsion, and water is known.

This mortar is used in a wide range of civil engineering and construction fields, and as a waterproofing agent, it is used for underground and interior walls, water storage tanks, water receiving tanks, septic tanks, sewage treatment plants, balconies, incineration plants, heat storage tanks, building exterior walls, and various silos. ing.

[Problems to be Solved by the Invention] However, in terms of chemical resistance, the mortar generally exhibits chemical resistance to alkalis, but is very weak to acidic substances. Therefore, this mortar becomes severely eroded and becomes unusable in 2 to 3 years for sewage treatment plants, human waste treatment facilities, industrial waste treatment facilities, and structures built on acidic soil.

In addition, the mortar described above may have poor adhesion depending on the underlying structure and environmental conditions, and it does not adhere to oil-wet concrete, so sufficient ground preparation is required.

In addition, beach tree relics, etc. (when used, they are often insufficient as a material to prevent the infiltration of chlorine ions in seawater).

[Means for Solving the Problems] In order to solve the above problems, the inventors of the present invention have developed a mortar composition with a specific combination containing a specific synthetic polymer emulsion with excellent chemical resistance. It is effective as an excellent waterproofing agent, and also serves as a frame care agent that protects concrete structures from neutralization reactions and salt damage.Furthermore, it has extremely high adhesive strength with concrete, and has excellent adhesion with oil-wet concrete. They discovered this and completed the present invention.

The mortar composition of the present invention contains 2 Portland cements.
0-40% by weight, 30-50% by weight of aggregate, 3% by weight of silica
8% by weight, 1-4% by weight of pigment, 10-20% by weight of epoxy resin polymer emulsion (resin solid content), and 10-20% by weight of water.

[Configuration and operational components of the invention] The configuration of the present invention will be described in detail below.

The mortar composition of the present invention contains Portland cement, aggregate, activated silica, pigment, synthetic polymer emulsion, and water as essential components.

As portland cement, it is possible to use back-through portland cement, early-strength portland cement, or white portland cement, and moderate heat, blast furnace cement, alumina cement, and ultra-fast hardening cement are also effective.The amount of cement used is 20~ If the amount of cement is less than 20% by weight, the strength will decrease significantly.
If it exceeds 1% by volume, the yield aX increases. The aggregate used is generally silica sand No. 3, No. 4, No. 5, No. 6, No. 7, etc., since this material is usually used in a thickness of 1 to 51111 ml.

Powdered silica is used, but fine powder
The silica preferably has a particle diameter of less than .mu.m. For example, silica fume, siliceous dust, etc., which are produced as by-products during the production of silicon or silicon alloys, are preferably used.

The amount of silica used is 3 to 8% by weight, which is effective in improving durability and water resistance.

However, if it is less than 3% by weight, no effect will be obtained, and if it exceeds 8% by weight, the amount of water added will increase and the fluidity of the mortar composition will deteriorate, resulting in a significant decrease in workability.

In addition, various pigments are mixed in according to the user's request to achieve the desired color, but in the case of this mortar composition, when 1 to 4% by weight of a white pigment (titanium white) is mixed in, the finish is similar to that of a concrete structure. The color will be .

Synthetic polymer emulsion (resin solid content) is 10-20
The percentage by weight is preferable, and if it is less than 10% by weight, the waterproof performance, carbonation performance, salt damage resistance, and chemical resistance will be insufficient.

However, if it exceeds 20% by weight, although the above performance is very good, the strength development of the mortar is delayed and the workability during construction becomes very poor.

The amount of water added is adjusted according to the user's working softness.

Examples of synthetic polymer emulsions include acrylic polymer emulsions, vinyl acetate polymers, emulsions, SBR polymer emulsions, ethylene-vinyl acetate polymer emulsions, styrene-acrylic polymer emulsions, and epoxy resin polymers. Although there are molecular emulsions and the like, in the present invention, hand-held epoxy resin emulsions are preferred. This epoxy resin emulsion is composed of a main resin and a curing agent, and contains the following essential components.

The main ingredient is a liquid bisphenol-based epoxy resin with an epoxy equivalent of 170 to 270, which is produced by reacting bisphenol A with a large excess of evilorhydrin in the presence of an alkali, and can be produced by a method known to those skilled in the art. It is possible.

These commercial products include Evodite EL-1, Evodite EL-2 (manufactured by Showa Kobunshi), Ebikoat 808, Epicoat 828 (manufactured by Yuka Shell Epoxy), and Evototo YD.
-115, Evototo YD-117 (manufactured by Toto Kasei), etc.

The curing agent is a water-dispersible or water-soluble polyamide amine resin. Polyamide amine resin is basically (1)
Polymerized fatty acid and (2) polyalkylene polyamine and (
3) 0.5~ at 150~250℃ using other modifiers
It is obtained by reacting for 15 hours under reduced pressure if necessary.

(1) Polymerized fatty acids are soybean oil, cottonseed oil, rapeseed oil, dehydrated mustard oil, tall oil, linseed oil, coconut oil, safflower oil,
Linoleic acid, the main component of rice bran oil, beef tallow, and Spanish mackerel oil,
The main component is dia-acid obtained by the Diels-Adler reaction of oleic acid, etc., and contains small amounts of trimer acid and monomer acid.

(2) Polyalkylene polyamines include ethylenediamine, diethylenetriamine, triethylenetetramine, and tetraethylenepentamine.

(3) Other modifiers include monocarboxylic acids such as acetic acid, caprylic acid, stearic acid, oleic acid, benzoic acid, or oxalic acid, maleic acid, succinic acid, mazelaic acid, diethylmalonic acid, adipic acid, isophthalic acid,
Dicarboxylic acids such as terephthalic acid ■ Amino acids such as glycine, β-alanine, γ-aminobutyric acid, and ε-aminocaproic acid and their lactams ■ Esters of polymerized fatty acids ■ Acrylonitrile, acrylic acid esters ■ Cyclic fats such as isophorone diamine Group amines (1) Aromatic amines such as xylene diamine. Commercial products of these water-dispersible or water-soluble polyamide amine resins include SDK #1 and SDK #2 (Showa Mini - manufactured by Showa Kobunshi).
, Tomide 245 (manufactured by Fuji Kasei) Ebilink 360,
Examples include Ebilink 380 (manufactured by Akzo Hemy), Adeka Hardener EH-203, and Adeka Hardener EH-204R. The ratio of epoxy resin and polyamide amine resin varies depending on the epoxy equivalent of the epoxy resin, the amine value of the polyamide amine resin, and the polymer composition, but it is 100%.
:80~100:20, but usually 100 near 0
~100:40 or so.

[Example] Examples will be described below to clarify the effects of the present invention, but the technical scope of the present invention is not limited thereto.

The materials used in the examples were A and B listed in Table 1.
, C, and only the synthetic polymer emulsion was changed. A is the composition of the present invention, formulations B and C are for comparison, B is a commercially available ethylene-vinyl acetate polymer emulsion (abbreviated as EVA), and C is a commercially available SBR type emulsion (abbreviated as 5DR). The epoxy resin polymer emulsion A is prepared in the following manner.

Add 125 kg of Evodite EL-1 to a polyamide amine aqueous solution prepared by dissolving SDK #l 15- in 60 ml of water and stir for 5 minutes with a hand mixer to create 100 kg of an epoxy resin polymer emulsion consisting of 40% epoxy resin and polyamide amine resin. I got it.

Table 1 Next, as test items in this example, an adhesive strength test, a water permeability test, a chemical resistance test, a salt spray test, a neutralization acceleration test, and an adhesive strength test with oil-wet concrete were conducted.

[Adhesive strength test]

The test was conducted in accordance with JIS A6909.

3 on concrete sidewalk board (JIS A3304)
Apply 2 kg/m2 of seed material and keep it at a temperature of 20°.
C1 was left standing in a curing room with a humidity of 65% RH for 4 weeks, and the change in adhesive strength was measured. The results are shown in Table 2.

Table 2 From the results, the adhesive strength of the product A of the present invention is overwhelmingly higher and better than that of the comparative products B and C.

[Water permeability test]

t φ儂/I1 1/3 Sand mortar molded plate (40 x 150) coated with 2 kg/m2 of the invention product A and comparative products B and C was used as a test specimen at a temperature of 20°C and a humidity of 65% RH.
Measurements were performed after curing for one day. The water permeability test was conducted in accordance with JIS A1404r "Test method for cement waterproofing agents for construction".

Further, the water pressure is 3 kJr/am2, the pressurization time is 111 r, and the result is expressed as the amount of water permeation increase.

Water permeability increase i=w2-w1 Wl: Weight before water permeability test (g) W2: Weight immediately after water permeability test (g) The results of this test are shown in Table 3.

The water permeability ratio in Table 3 is the value when the increase in water permeability of the brane to which no waterproofing agent is applied is set as 100.

Inventive product is 0.44 compared to Blaine 100, comparative product B
, C was 0.83, indicating that the product of the present invention had excellent waterproof performance.

[Chemical resistance test]

The test product was a concrete sidewalk board (JIS A3304) coated with 2 kt/m2 of each of the invention product A and comparative products B and C, and left for 4 weeks in a curing product at a temperature of 20°C and a humidity of 65% RH. And so.

The outline of the test is shown in FIG. 1. The pH of the chemical immersion tank 8 is kept constant and the chemical is uniformly stirred by a stirrer 7. 1
is a supply tank for hydrochloric acid or sulfuric acid, which is led to a chemical immersion tank 8 via an acid supply pump 2.

3 is the water source. The pH is maintained constant by automatically opening and closing the acid control valve 4 or the tap water control valve 5 using the pH recording controller 6. Reference numeral 11 denotes a circulation pump, and a liquid level controller 9 automatically opens and closes a drain control valve 10 to discharge a portion of the liquid to a bit 12.

The test was A mortar coated plate 13.8 mortar coated plate 14,
The test was carried out by immersing the C mortar coated plate 15 in the chemical immersion tank 8 at a pH of 4 and a temperature of 30° C. for 6 months. Hydrochloric acid and fJt acid were used as acids.

The test results were almost the same for hydrochloric acid and sulfuric acid, and product A of the present invention
Although the surface of Comparative Products B and C was only brownish and no abnormality was observed in surface hardness, the mortar layer of Comparative Products B and C peeled off easily when rubbed by hand. Furthermore, the underlying concrete sidewalk boards coated with this material had deteriorated significantly. The results revealed that product A of the present invention was significantly superior to comparative products B and C.

[Salt spray test]

The test method was based on JIS Z2371. The test specimen was a steel plate. Various materials were applied to the steel plate at 2 kg/m2, and this was placed in a curing room at a temperature of 20°C and a humidity of 65% RH.
After allowing it to stand for a week, it was placed in a salt spray test tank. In addition, salt water
The conditions for I14M are a temperature of 35° C., a humidity of 95% FIN, a concentration of salt water of 5% by weight, and a spray pressure of 1.0 parts/port 2.

The salt water spraying time was 1000 tlr and 2000 hr, and the rusting rate and blistering condition were investigated.

The results are shown in Table 4.

Table 4 Invention product A has a salt water spraying time of 2000 compared to comparative products B and C.
The rusting rate was 0% at hr, and no blistering phenomenon occurred.

[Neutralization acceleration test]

1/3 sand mortar molded body (100 x 100 x 40
Inventive product A, comparative products B and C were applied at 2 kg/m2 to the entire surface of a 0 ram) at a temperature of 20°C and a humidity of 65% RH.
The specimens were subjected to air curing for two weeks. ! !
The post-natal test specimen was placed in a neutralization accelerator (temperature 40°C, humidity 40°C).
%RH1 (carbon dioxide gas concentration 10%), and after three months had elapsed, it was taken out and cut, and a phenolphthalein solution was sprinkled on it to measure the depth of carbonation.

The results are shown in Table 5.

Table 5 Inventive product A and comparative product B had a smaller carbonation depth than comparative product C and were better.

[Adhesive strength test with oil-wet surface concrete] The test was conducted by JL.
It was carried out in accordance with SA6909. A concrete sidewalk board (JIS A3304) was completely immersed in machine oil for 10 days. After that, the actual concrete was taken out from the oil and 3! ! The above material was applied +r/m2 onto 2, and the adhesive strength was measured by leaving it in a curing room at a temperature of 20° C. and a humidity of 65% RH for 4 weeks.

The results are shown in Table 6.

Table 6 From the results, it was found that invention product A had good adhesion to oil-wet concrete, but comparative products B and C did not adhere to oil-wet concrete at all.

[Effects of the invention] The mortar composition of the present invention has excellent chemical resistance, waterproof property, and
Because of its excellent protective and adhesive properties, it is useful as a waterproofing agent, a frog protectant, and an adhesive in the civil engineering and construction fields.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram showing the method of chemical resistance testing of Examples. 1... Hydrochloric acid or sulfuric acid supply tank 2... Acid supply disposal i't, O〉fu 03... Water source 4.
・・Acid control valve 5・Water water control valve 6・pH
Recording controller 7... Stirrer 8... Chemical immersion tank 9... Liquid level controller 10... Drainage control valve 11... Circulation pump 12... Bit

Claims (1)

[Claims] (a) Portland cement 20-40% by weight (b) Aggregate 30-50% by weight (c) Silica 3-8% by weight (d) Pigment 1-4% by weight (e) Epoxy resin polymer emulsion (Resin solid content) 10-20% by weight (f) Water 10-20% by weight A mortar composition consisting of.