JPS6021838A - Water-dispersible admixing agent for cement and manufacture - 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 The present invention relates to an aqueous dispersion admixture for cement and a method for producing the same. More specifically, the present invention relates to an aqueous dispersion admixture for cement that can prevent the generation of efflorescence and bubbles in various cement products and provide these products with an excellent smooth and glossy surface, and a method for producing the same.

BACKGROUND ART Cement products with smooth and glossy surfaces have been desired for construction materials, arts and crafts, and various other fields. In the field of building materials, for example, the appearance of glossy cement tiles. Conventionally, glossy tiles made of ceramics have been preferred as glossy tiles, but ceramic tiles can be processed in numerous ways such as molding, drying, firing (unglazed), glazing, glazing, overlaying, and firing. Since it is manufactured through a process and requires advanced technology, it is inevitably expensive.

Therefore, it was hoped that a tile with a simpler manufacturing process and cheaper price would emerge. With conventional molded cement tiles, despite attempts to use mold release agents and defoamers, the surface of the resulting tiles is rough and has numerous pinholes and cracks, resulting in poor surface smoothness. The gloss was not completely satisfactory, and therefore it could not be used as a decorative tile for construction purposes.

Therefore, the inventor of the present invention has discovered that by using various types of cement when manufacturing cement tiles, it is possible to manufacture cement tiles that have the same gloss as ceramic tiles.
- Additions that can be used during the mixing of raw materials for products or during the finishing of products to obtain equivalent glossy cement products in an extremely simple process compared to the production of conventional glossy products such as ceramic products. As a result of intensive research, we discovered this water-dispersed admixture for cement.

Zunawaji, the present invention is based on gum arabic, alkali silicate,
A water molecule IT admixture for cement consisting of alkali sulfate, alkali carbonate and water, gum arabic and alkali silicate are added to a predetermined amount of water under stirring to separate the liquid (A), and then This is an fR manufacturing method for an aqueous dispersion admixture for cement in which alkali sulfate and alkali carbonate are added individually or as a mixture to (A).

The method for manufacturing this water molecule & type admixture for cement is to first pulverize gum arabic and alkali silicic acid as finely as possible, and then gradually add the mixture to a predetermined amount of water with thorough stirring. ). Liquid (A) is an emulsion. Next, an alkali sulfate and an alkali carbonate are gradually added to the liquid (A) under IW stirring to obtain an emulsion, that is, the admixture of the present invention. In this case, both the alkali sulfate and the alkali carbonate may be stirred and mixed in advance and added to (A) as a mixture. Furthermore, either one of them can be added to the liquid (A) individually, first, simultaneously, or alternately without mixing in advance.

As the alkali silicate in the liquid (A), sodium silicate and potassium silicate can be used, but sodium silicate is preferred. Gum arabic constituting (A);
The blending ratio of alkali silicate and water is determined taking into consideration the difficulty of emulsification, stability, performance of the present admixture, etc., but the weight ratio of gum arabic: sodium silicate: water = 3:1:10 case is best. The flocculated liquid (A) is an emulsion.

As the alkali sulfate, an alkali sulfate such as sodium sulfate or potassium sulfate is used, and as the alkali carbonate, an alkali carbonate such as sodium carbonate or potassium carbonate is used. More preferred is the case where sodium sulfate is used as the sulfate and potassium carbonate is used as the carbonate.

Sodium sulfate (Nas+5O4) and potassium carbonate J, (
K2CO3) can be used at a weight ratio of 1:lO to 0.1, but the most preferred is l:l.

Next, the blending amounts of alkali sulfate and alkali carbonate relative to (Δ) are determined by taking into account the emulsion stability and various performances of the admixture obtained by 1q. It is necessary that the blending ratio of the other liquid (Δ) be at least 1% by weight higher than that of the other liquid (Δ).

It is most preferable that the blending ratio of both of them to (A> is about 10% by weight M%.

The admixture of the present invention can be used by adding a predetermined amount of the admixture as it is when mixing cement materials, or as a water dilution solution diluted 5 to 50 times with water, or by adding a predetermined amount of the admixture to various cement materials. After manufacturing the product, the admixture can be mixed with cement or cement mortar, or used alone. 'J - Smooth and glossy cement products can be obtained by spraying or coating the surface of the product.

When the admixture of the present invention is added when mixing cement materials such as cement, old materials, various additives, and water, the weight ratio of the admixture to the amount of cement used is 0.1% (i.e., the admixture/ Cement - o,oot > or more, preferably 0.
By adding 3% or more, it is possible to produce an excellent cement cracked product that does not require a finishing process after demolding (which has never been seen with conventional products). In particular, when it is added in an amount of 1% or more, a glossy cement 1 product having a smooth surface and a mirror-like glossy surface equivalent to that of a ceramic product can be obtained.

That is, the weight ratio of this admixture to cement is 0.1 to 0.
If 2% is used, it is still not possible to impart a sufficient smooth surface or glossy surface to the obtained cement product, and although there is no sufficient efflorescence prevention effect, it is possible to obtain a sufficient defoaming effect. can. Further, at 0.2 to 0.3%, the smoothness of the surface of the cement product is still insufficient, but the occurrence of efflorescence on the surface can be completely prevented. Furthermore, if 0.3% or more is used, a molded cement product with a contoured surface without pinholes or cracks can be BF. In addition, 1%
When used above, it is possible to impart an excellent mirror-like gloss quality to the surface of the cement product, and at the same time, the above-mentioned defoaming effect, creepage forming effect, and efflorescence prevention effect can be exhibited.

In addition, due to the defoaming effect of this admixture as described above, when using this admixture, it is unnecessary to add a new escape agent, and defoaming can be performed without adding defoaming vibration, making it possible to improve the quality of cement products. The generation of pores due to air bubbles is prevented not only on the surface but also inside the surface.

Therefore, the obtained cement product also has high physical strength. Furthermore, molded cement according to the present invention can be removed from molds and tiles from straw molds for smooth product surfaces! I.J.
I'll be extremely easy to do. Moreover, the occurrence of efflorescence on the surface of the cement molded product can be completely prevented. In other words, the dispersion water-soluble admixture for cement of the present invention can impart excellent smoothness and gloss to the surface of the cement product, and at the same time has a release agent effect, defoaming effect, and prevention of efflorescence. It is an excellent cement additive that also has great effects.

The reason for the excellent performance described above is thought to be that the components in the admixture react with cement to form a smooth, glossy, strong film on the surface of the cement product.

By using the admixture of the present invention, for example, compared to the conventional ceramic tile manufacturing process, cement tiles can be manufactured in an extremely simple process in which the manufacturing of glossy tiles is completed at the same time as the molding process is completed, and at a lower cost. Furthermore, the obtained cement tiles are excellent in that they have no pinholes either on the surface or inside, and have creeping and glossy surfaces equivalent to those of conventional porcelain tiles. In addition, by using the admixture of the present invention, many products other than conventional metal, synthetic resin, and ceramic parts such as bathtubs, countertops, and washstands that are not made of cement can be made into concrete, mortar, and other cement products by using the admixture of the present invention. Can be easily replaced.

Furthermore, by using the admixture of the present invention, most of the 11 conventional cement products consisting of mortar and concrete, such as cement bricks, cement color telephone poles, and cement wall materials, can be manufactured using the same manufacturing process as before. With a simple process that does not change much, it is possible to provide smooth and glossy surfaces that were never found in these conventional products.

In addition, the material of the formwork used when manufacturing cement molded products with this admixture may be metal, as long as the surface is smooth.
Various materials such as plastics, ceramics, and glass can be used, and plastic, metal films, and release paper can also be used. Not only cement products with smooth surfaces,
By using a large patterned frame, it is possible to easily manufacture various hobby glossy-lement products having uneven patterns.

Examples will be described below, but the scope of the present invention is not limited thereto. In addition, in the following examples, all compounding ratios, 96, etc. indicate weight ratios and weight % unless otherwise specified.

Example 1 (1) Production of water dispersion admixture for cement 10kg water measurement
3 kg of gum arabic and 1 k of sodium silicate
g was added thereto, and the mixture was thoroughly stirred and mixed to separate the liquid (A).

Next, 1.4 kg of sodium sulfate and 1.4 kg of potassium carbonate were mixed and the mixture (B) was separated.

While thoroughly stirring the liquid (A), the entire amount of (13) was gradually added to obtain an aqueous dispersion admixture for cement of the present invention. The blending ratio of sodium sulfate and potassium carbonate to liquid (A) was 10% each.

The obtained admixture had a pH of 2.j (glass electrode, 10% liquid), a specific gravity of 1.162 (buoy specific gravity n1), a viscosity of 205,
The emulsion had a specific surface tension of 41.5 (drop count, 1% liquid).

(2) Production example of glossy cement tiles Water dilution of the admixture obtained in the above production example (admixture/
Water - 1/9) 0.1 kg, Portland cement 1.
0 kg, fine sand 3. 2.0 kg and 0.9 kg of water and kneaded well. The admixture/cement ratio was 1% by weight. Next, this was placed in a stainless steel mold with a smooth surface measuring 30 cm long x 30 cm wide x 1.5 am thick, and left to cool in a humid air for 24 hours (20°C, 111190%
) and then demolded. Demolding was easy.

Visual observation of the surface of the obtained Cement 1-tile revealed that it was a smooth surface with no pores caused by air bubbles, and had a gloss equivalent to that of a porcelain tile.

Further, visual observation after leaving it outdoors for 3 years showed no decrease in gloss, and no efflorescence or cracks were observed.

Examples 2 to 4 Lightweight glossy cement tiles were produced in the same manner as in (2) of Example 1, except that the amount of the admixture obtained in +1) of Example 1 was changed.

Example 5 A water dilution of the admixture obtained in Example 1 (admixture/water = 1
/9) 0.1 kg, Portland cement 1.0 k
g, lightweight aggregate (whitebait from Kagoshima) 1.5kg, water 0,9
kg and kneaded well. The blending ratio of admixture/cement was 1%. Next, make this 30 cm long x 3 wide
It was placed in a 9 cm x 1.5 cm thick polyethylene resin mold with a flat surface and left to cool in a humid air for 24 hours (20°C, R1
190%) and then demolded. Demolding is easy.

Visual observation of the surface of the obtained cement tile revealed that
It had a smooth surface with no pores caused by air bubbles, and had a luster equivalent to that of porcelain tiles.

Further, visual observation after leaving it outdoors for 3 years showed no decrease in gloss, and no efflorescence or cracks were observed.

Examples 6 to 8 Lightweight glossy cement tiles were manufactured in the same manner as in Example 6, except that the amount of the admixture used in Example 6 was changed.

Comparative Example 1 When the method of Example 1 was carried out without using this water dispersion admixture for cement, demolding was difficult, many pinholes occurred, and the cement tile had a rough surface and was completely matte. .

Comparative Example 2 When the method of Example 5 was carried out without using the present water-soluble cement dispersion admixture, demolding was difficult, many pinholes occurred, and a completely matte lightweight cement with a rough surface was obtained. It was tile.

The results of the above examples and comparative examples are shown in Table 1.

Table 1 (Note) In Examples 1 to 4 and Comparative Example 1, the usage ratio (weight ratio) of the four materials was cement:bone phase:water=t:a:t.

In Examples 5 to 8 and Comparative Example 2, the usage ratio (weight ratio) of interest was cement:aggregate:water; 1:], 5:l.

In the table, O means no pores, no efflorescence, good product surface smoothness, and good gloss on the surface, × means equivalent to pores,
△ means the occurrence of efflorescence, no smoothness on the surface of the product, no gloss on the same surface, and is characterized by an evaluation between ○ and ×. Patent applicant: Masahiro Abe, Patent attorney: Yasuhiro Funakoshi

Claims (1)

[Claims] 1. Gum arabic, alkali silicate, alkali sulfate,
Aqueous dispersion admixture for cement consisting of alkali carbonate and water. 2. The alkali silicate is sodium silicate, the alkali sulfate is sodium sulfate, and the alkali carbonate is potassium carbonate, and the weight ratio of gum arabic: sodium silicate: water is 3:1:10, and sodium sulfate and Claim 1 in which the blending ratio of potassium carbonate and/or gum arabic, sodium silicate, and water hydroxide is small (both are 1% by weight or more).
Aqueous dispersion admixture for cement as described in . 3. Add gum arabic and alkali silicate to a predetermined amount of water while stirring, tear off the liquid (A), and then add the (A)
) A method for producing an aqueous dispersion admixture for cement, in which alkali sulfate and alkali carbonate are added individually or as a mixture. 4. The alkali silicate is sodium silicate, the alkali sulfate is sodium sulfate, and the alkali carbonate is potassium carbonate, and the weight ratio of gum arabic:sodium silicate:water constituting the liquid (A) is 3: 1:10, and the blending ratio of both or either of sodium sulfate and potassium carbonate to liquid (A) is small (both are 1% by weight or more). Method of manufacturing the agent.