JPS60191071A - Manufacture of freeze-resistant alc - 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 method for producing aerated concrete (hereinafter abbreviated as ALO).

More specifically, the present invention relates to a method for efficiently producing ALO with excellent frost damage resistance.

ALO is made by adding an appropriate amount of water, metal aluminum powder, etc. to calcareous raw material powder such as lime and cement, and silicic acid raw material powder of one or more of silica sand, silica stone, and various granulated slags, and stirring the mixture. It is then left to stand to become a semi-plasticized product, which is then transferred to an autoclave and cured with high temperature and high pressure steam.

Although this ALO has a light bulk specific gravity of approximately 0.5, it has excellent compressive strength and heat insulation properties, but the voids formed by free water etc. during foaming and semi-plasticization cause the ALO of the product to deteriorate. Since it remains as it is, there is a problem in that it exhibits capillary action and easily absorbs water.

This phenomenon results in repeated freezing and thawing in cold regions, which causes damage to the ALG.

As a method for solving the above-mentioned freezing damage, 1) use of a silicone compound alone or in combination with a surfactant; 2)
Metallic aluminum powder is used as finer grains. etc. have been proposed.

However, in the case of method 1) above, although water repellency does improve, silicone-based compounds are not compatible with water, so they are less effective as additives that impart frost damage resistance, and tend to reduce the compressive strength of the product. This will further increase the cost.

In addition, in method 2), the reaction rate of fine aluminum particles is too fast and the delicate balance between foaming and the solidification rate of the raw material slurry is disrupted, so the homogeneous formation of the bubbles tends to be disturbed. Water vapor penetration into the semi-plasticized material is slow and uneven areas appear, resulting in ALO
It had a number of drawbacks, including a tendency for cracks to form.

An object of the present invention is to provide a method for producing ALO that is free from these drawbacks and has excellent frost damage resistance.

In order to achieve this objective, the inventors of the present invention, as a result of intensive research, added a very small amount of morpholine to the raw material slurry of ALO.
An additive prepared by mixing one or both of ethanolamine and one or both of oleic acid and oleic acid derivatives in a predetermined ratio, and further adding and mixing a predetermined amount of an alkyl succinic acid derivative to this mixture. The present inventors discovered that ALO with excellent frost damage resistance and satisfactory physical properties such as compressive strength can be obtained by adding a very small amount of ALO and producing AllO according to a conventional method.

That is, in the method of the present invention, approximately 0.0
The weight ratio of one or both of morpholine and ethanolamine and one or both of oleic acid and oleic acid derivatives to 100 parts by weight of the total solid content of the raw material to which 5 to 0.10 weight of metal aluminum powder is added. Additives prepared in a ratio of 1.0 part by weight of the mixture in a ratio of 1 to 4 to 1 and 0.8 to 8.0 parts by weight of the alkenyl succinic acid derivative,
ALO is produced according to a conventional method using raw materials to which 0.05 to 0.50 parts by weight of solids are added.

In the method of the present invention, each additive used is not specified, but mono-, di-,
Examples of avian ethanolamine and oleic acid derivatives include oleic acid methyl ester, oleic acid propyl ester, oleic acid butyl ester, oleic acid allyl ester \ oleic acid glycerin ester, and alkenyl succinic acid derivatives include diisobutenyl succinic acid derivatives. triisobutenylsuccinic acid m conductor (sodium salt of monoethyl ester, sodium salt of monopropyl ester, sodium salt of monopositive butyl ester, sodium salt of monopropyl ester, etc.) sodium salt of amyl ester, etc.) are preferred.

The reason why the additive is prepared in such a way that one or both of morpholine and ethanolamine and one or both of oleic acid and oleic acid derivatives is in a weight ratio of 1 to 4:1 is because the ratio of amine salt, etc. If the ratio is higher than this, the raw material slurry will coagulate faster, inhibiting gas generation by the metal aluminum powder and disturbing bubbles. Conversely, if the ratio of amine salt, etc. is lower than this, the ratio of oleic acid will increase accordingly, making it hydrophobic. This is because the properties are too strong and inhibit the dispersion of the metallic aluminum powder itself.

The reason why the following GC flukenyl succinic acid derivative is mixed with the above-mentioned mixture of morpholine and oleic acid at a predetermined ratio is that too much alkenylconolysuccinic acid derivative will disturb foaming, and too little will cause foaming. This is because it becomes coarse.

The reason why the above mixture is added as an additive in an amount of 0.05 to 0.50% by weight based on the solid material of the raw material is that if it is less than this, no effect on frost damage resistance will be observed, and if it is added more than this, it will not be effective. Especially since the effect does not improve.

Since this additive is added in a very small amount to the raw material, it is desirable to dilute it in advance with water at a ratio of about 1:1 before use.

According to the method of the present invention, as shown in the examples, the frost damage resistance is extremely excellent, and the compressive strength reaches the target level.
These effects are achieved by combining alkenylsuccinic acid derivatives with morpholine, which is a solvent for industrial chemicals such as wax, or with ethanolamine, which is known as an emulsifier and synthetic detergent, and monooleic acid or its derivatives. These additives can be obtained by using them together in suitable proportions, and even if one of these additives is missing, the effect of the method of the present invention cannot be obtained.

Examples will be described below.

Example 6 Parts by weight of powdered quicklime, 22 parts by weight of Portland cement, 82 parts by weight of silica powder, 0.05 parts by weight of aluminum powder, 40 parts by weight of water and the total amount of the solid content. An additive is prepared by mixing morpholine or ethanolamine and oleic acid or a derivative thereof at a predetermined ratio, and mixing the mixture and an alkenyl succinic acid derivative at a predetermined ratio, in terms of external weight %. was diluted to a weight ratio of 1 part water and 1 part additive, added as a solid content in a predetermined amount, stirred to form a slurry, foamed, semi-plasticized, and then cured in an autoclave to produce AI, O. JISA5416 compressive strength of the product
, Freeze Damage Dust Test Samples based on Mo-666 were examined for their performance using a 4X4X16 magnification.

Incidentally, scaling of frost damage dust was observed after each 50 cycles, with one day (24 hours) being one cycle.

The results are shown in the table in comparison with reference examples.

As can be seen from the table, the reference examples of experiments A1 to A6, in which the blending ratio or addition amount was outside the range of the method of the present invention, had results that could hardly be put to practical use in both the frost damage test and the compressive strength. However, the product produced by the method of the present invention showed very good results in terms of frost damage and also showed +okgr/cnb in compressive strength.
Cleared all.

Experiment A in which the amount of additive added was greater than the limited range of the method of the present invention
No particular improvement in effectiveness was observed for 17.18 either.

Applicant: Sumitomo Metal Mining Co., Ltd. Agent: Patent attorney Katsunari Donakamura

Claims (1)

[Claims] (1) As the main raw materials, a mixture of calcareous raw materials such as lime and cement, silicic raw materials such as silica stone and silica sand, and metal aluminum powder as a blowing agent. 1.0 parts by weight of a mixture of one or both of the amines and one or both of the oleic acid and oleic acid derivatives in a weight ratio of 1 to 1 to 0.8 to 8.0 parts of the alkenyl succinic acid derivative. A with excellent frost damage resistance characterized by using a raw material containing 0.05 to 0.50 parts by weight of an additive added to 0 parts by weight.
Method of manufacturing LO.