JPS60251162A - 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 The present invention relates to a mortar composition, and more particularly, to a mortar composition comprising a polymer dispersion with excellent elasticity and colored sand with excellent colorability. be.

Conventionally, a mortar composition in which Portland cement is blended with a polymer dispersion and a suitable aggregate is known as a so-called polymer cement mortar. This mortar composition has excellent water resistance and is usually used as mortar for decorating the surfaces of flooring materials, such as interior or exterior walls of buildings, trains, ships, etc. Therefore, mortar is applied to the surface of a metal plate, foamed concrete plate, gypsum plate, synthetic resin plate, etc., which serves as a base material, by spraying it, but there is a drawback that cranks tend to get into the mortar after hardening.

There are two possible causes for this: one is caused by the shrinkage of the mortar itself, and the other is caused by the lack of elasticity in the mortar when the substrate itself bends.

In view of the above-mentioned circumstances, the present inventors have investigated various ways to prevent the occurrence of cranking in mortar by improving the elasticity of mortar while maintaining the characteristics of conventional polymer cement mortar. The present inventors have discovered that when using a mortar composition obtained by blending in a specific ratio, the occurrence of cracks due to shrinkage of the mortar itself can be significantly suppressed, and the present invention has been completed.

In this case, the earlier application, Japanese Patent Application No. 58-1'04623, states that it is okay to add pigments as a coloring method, but in the same coloring method as this conventional colored cement mortar, pigments Due to differences in dispersion, PH distribution, drying time, etc., there was a problem in that color unevenness occurred in the mortar layer.

Furthermore, the terms Portland cement and alumina cement simply refer to blank cement, and are inappropriate when attempting to color mortar.

The object of the present invention is to prevent uneven coloring by using colored sand, and to use it as a thinly painted finishing material or decorative material, which has properties as a polymer cement mortar and excellent elasticity.

That is, the gist of the present invention is: ■ white cement, ■ white alumina cement 0.5 to 5 times the weight of white cement, and ■ 0.3 to 5 times the weight of white cement.
2 times the weight of gypsum hemihydrate and ■ white cement, white cement, white alumina cement, and 0.1 to 1 times the weight of polymer dispersion as a polymer component, and colored sand as aggregate. , white alumina cement, and gypsum hemihydrate in an amount of 1 to 4 times the total weight.

The present invention will be explained in detail below.

In the present invention, it is essential that the mortar composition contains five components: white cement, white alumina cement, gypsum hemihydrate, polymer dispersion, and silica sand or colored sand. As white cement and white alumina cement, common commercially available products can be mentioned. White alumina cement is defined as one in which the content of iron oxide as a component is less than 0.5%.

The content of white alumina cement is 0.5 to 5 times the weight of white cement, preferably 1 to 3 times the weight of white cement. If the content of white alumina cement is less than the above range, when mortar is applied, Not only is the curing speed slow, but also a product with high strength cannot be obtained. On the other hand, if the amount exceeds the above range, a mortar with good elasticity cannot be obtained and cracks are likely to occur, which is undesirable. One of the features of the present invention is that white cement and white alumina cement are used in combination in a specific ratio.

Furthermore, in the present invention, gypsum hemihydrate is present together with both of the above-mentioned cements, and the content of gypsum hemihydrate is 0.3 to 2 times the weight of white cement, preferably 0.5 to 1 .3 times the weight. Due to the presence of this gypsum hemihydrate, it is possible to obtain a good mortar layer that is even more excellent in elasticity, has high strength, and is less likely to generate cranks.

Next, the polymer dispersion used in the present invention is not particularly limited as long as it is aqueous, and various conventionally known ones can be used, but usually polyacrylate, polyvinyl acetate, etc. , thermoplastic resin emulsions such as polyvinylidene chloride-polyvinyl chloride, polyvinyl propionate, polyethylene-polyvinyl acetate, polypropylene; thermosetting resin emulsions such as epoxy resins; asphalt, rubber asphalt,
Bituminous emulsions such as paraffin; chloroprene rubber, styrene-butadiene rubber, methyl methacrylate
Examples include butadiene rubber, synthetic rubber latex such as butadiene rubber, and mixtures thereof. The content of these polymer dispersions is 0.0% as a polymer component with respect to the sum of white cement, white alumina cement, and gypsum hemihydrate. 1 to 1 times by weight, preferably 0. 2 to 0.8 times the weight, and if this content is less than the above range, the water resistance of the mortar will be poor and the elasticity will be significantly lower; Although it improves the elasticity of the material, it has the disadvantage that the strength and durability deteriorate, which is undesirable.

In addition, as for the type of aggregate, colored sand of size 5 to 8 is usually used, and it can be colored in any color depending on the purpose and location. The content of aggregate is usually 1 to 4 times, preferably 1 to 2 times by weight, the sum of white cement, white alumina cement, and gypsum hemihydrate.

This colored sand is usually made from, for example, No. 5 to 8 crushed sand, river sand, crushed sand, etc., and is coated with a paint having good water resistance, alkali resistance, and weather resistance.

In the present invention, in addition to the above-mentioned components, for example, a dispersant, a filler, etc. may be appropriately added as long as the characteristics of the present invention are not lost.

In order to actually form a mortar layer using each of the above-mentioned components, a mixture of each component is usually sufficiently kneaded with water in an amount of θ to 0.2 times the weight of the mixture in accordance with a conventional method, and then, This can be done by applying it with a trowel.

As described above, according to the present invention, it is possible to obtain a good mortar with significantly less occurrence of cranks due to shrinkage of the mortar or deflection of the base material. In the present invention, one of the reasons for obtaining mortar with such excellent elasticity is that in the case of the specific composition of the present invention, (3CaO・A, 1
zOa ・6HzO) and (CaSO,' 2H,O) are generated, which further generates ettringite (3Ca
This is because O・A I t O33CaS04 ・32H20) is generated. In other words, since ettringite is a needle-shaped crystal, the resin component enters the gaps between the needle-shaped crystals, resulting in a structure that has excellent elasticity and is difficult to be cranked into. Moreover, since ettringite has a large amount of crystal water, it is preferable as a mortar containing a relatively large amount of organic matter because it has excellent nonflammability and flame retardancy.

In addition, when using white cement, it can be said to be better as a finishing material because it has sufficient elasticity even with a smaller amount of resin than black cement. Furthermore, since the present invention contains alumina cement, the mortar is hardened to the inside in a short time, so the initial strength of the mortar is high and the workability is good.

In addition, because colored sand is used as the coloring material and is used as a finishing material for thin coating, color unevenness is less likely to occur, resulting in a beautiful finish.

Therefore, the mortar composition of the present invention is particularly preferable as a mortar for finishing or decorating flooring materials.

Further, the substrate to which the mortar composition of the present invention is applied is not particularly limited, but excellent effects are exhibited when applied to metal plates such as iron plates, aluminum plates, or galvanized plates, for example. Of course, it goes without saying that it can be applied to surfaces made of concrete.

<Examples and Comparative Examples> Portland cement, alumina cement, and gypsum hemihydrate shown in Table 1 were mixed, and a polymer dispersion shown in Table 1 and 200 parts of crushed sand were mixed therein at 0.0%. The kneaded mixture was mixed with 0.7 times the amount of water for 0.1 hour, and then the kneaded mixture was applied onto galvanized plates so that the thickness after curing was 4 mm, and the mixture was heated at 20°C and 65°C.
Elasticity tests under conditions of %RH for 2 days, 5 days,
In the efflorescence test, it was cured for 2 days.

An elasticity test of the mortar was conducted by bending the plate having the mortar layer obtained in this manner by 120 degrees horizontally, and the degree of crumpling of the mortar layer was investigated. The results are shown in Table 2.

Next, several drops of water were dropped on the plate-shaped article having the mortar layer shown above, and the state of efflorescence after being left at room temperature for one day was examined. The results are shown in Table 3.

In addition, white cement, white alumina cement,
Samples were prepared in the same manner as described above by adding 1% or 5% of pigment to the total weight of gypsum hemihydrate and silica sand, or by using colored sand instead of silica sand, and the state of uneven color was observed. The results of the investigation are shown in Table 4.

Table 1-1 Comparative Example Table 1-2 Note: The amount of polymer dispersion used indicates the weight ratio of the polymer component to the sum of Portland cement, alumina cement, gypsum, and aggregate.

Table 2 Table 3 Elasticity test results Efflorescence test results C has a lot of crap Table 4 Color unevenness test results Note) Evaluation of color unevenness test ○ -11---No uneven color at all △－・－There is some color unevenness ×---There is considerable unevenness in one color. Patent applicant: Kikusui Chemical Co., Ltd. Procedural amendment (voluntary) Cold day in August 1982 1. Display of the incident 1981 Patent Application No. 106800 2. Name of the invention mortar composition 3. Person who makes corrections Relationship to the incident: Patent applicant spontaneous

Claims (1)

[Claims] I ■White cement, ■White alumina cement in an amount of 0.5 to 5 times the weight of white cement, ■Gypsum hemihydrate in an amount of 0.3 to 2 times the weight of white cement, and ■White cement. , white alumina cement, and hemihydrate gypsum as a polymer component, 0.1 to 1
A mortar composition characterized by containing twice the weight of a polymer dispersion, (1) suitable colored sand as an aggregate, and (2) suitable water. 2. The mortar composition according to claim 1, wherein the content of aggregate is 1 to 4 times the weight of the sum of white cement, white alumina cement, and gypsum. 3. The mortar composition according to claim 1 or 2, wherein the colored sand is silica sand No. 5 to 8 coated with a paint having good water resistance and alkali resistance. 4. The mortar composition according to claim 1, wherein the polymer dispersion is an aqueous thermoplastic resin emulsion.