JPH01130907A - Release agent for frame for concrete - Google Patents

Abstract

PURPOSE:To improve releasing performance and rust proofing property by a method wherein mineral type oil is blended with wool grease and, further, liquid paraffin is added as the adding agent of mineral type oil. CONSTITUTION:The mixing ratio of respective constituents is determined so that release agent is mixed with 0.01-20% pts.wt. of wool grease, the release agent is mixed with 50% pts.wt. or more of mineral type oil and the release agent is mixed with 0.01-40% pts.wt. of liquid paraffin. The wool grease is molten at a temperature near 50 deg.C and previously mixed mineral type oil and the liquid paraffin are preferably added thereto. Various high-class fatty acids are contained as the constituent of the wool grease and, as a result, releasing performance may be obtained. The property of the wool grease, which is one of the defects of the wool greases and being mixed with water easily, may be improved by mixing it with the mineral type oil. The wool grease is provided with rust proofing property which is the property of the wool grease itself and, further, the oil is mixed with liquid paraffin, whereby releasing performance may be improved and the grease may permeate into fine scratches on the internal surfaces of a frame for concrete.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a composition relating to a release agent for concrete metal frames.

[Background of the Invention] Conventionally, wool grease has been used as purified lanolin as a raw material for cosmetics, etc., but the present invention proposes a new method of using wool grease, using it as a stripping agent for concrete metal frames. It is something.

[Prior Art and Problems] There are three types of conventional formwork stripping agents: oil-based, water-dispersed, and resin film-forming agents, but each of them has drawbacks. Specifically, oil-based products are low in cost, but have drawbacks such as low peeling performance. Water-dispersed materials have drawbacks such as rusting of the mold itself when used in metal frames. Those that form a resin film have disadvantages such as high cost and problems with volatile solvents.

[Means for Solving the Problems] As a means for solving the above-mentioned conventional problems, the present inventors have
Wool grease was selected as a component to be added to the stripping agent, and liquid paraffin was added as an additive to the mineral oil agent to improve stripping performance.

A feature of the present invention is that various higher fatty acids are contained as components of the wool grease, and as a result, peeling performance is obtained. However, wool grease easily mixes with water and cannot be used alone as a stripping agent. Therefore, in order to take advantage of the advantages of wool grease, by mixing it with a mineral oil-based lubricant, the drawback of wool grease, which is that it easily mixes with water, can be improved. In addition, wool grease itself has anti-rust properties, and this, combined with the water repellency of mineral oil, is effective in preventing rust on metal frames. Further, since it does not interfere with the hardening of cement, even if wool grease is used as a component of the release agent, there is no adverse effect on the strength of the cured product, and almost no cement or the like remains in the formwork. However, this alone has a performance comparable to that of conventional stripping agents, and is unsatisfactory in terms of ease of peeling of concrete. Therefore, the present inventors further improved the peeling performance by mixing liquid paraffin into the mineral oil-based oil, which penetrated well into the small scratches on the inner surface of the mold, and had a similar peeling effect on the mold. I discovered that I have it. However, liquid paraffin alone does not provide satisfactory removability.

As described above, the mixture of the three exhibits superior performance as a release agent than either each alone or a mixture of the two. The wool grease used in the present invention may be wool grease as a by-product obtained during wool refining, or purified lanolin obtained by refining it. Further, as the mineral oil-based oil, those currently used as components of stripping agents can be used, and specific examples include kerosene, machine oil, spindle oil, and the like. Further, as the liquid paraffin, commercially available liquid paraffin or the like can be used. The mixing ratio of each component is 0.01 to 20.0% for wool grease in the stripping agent.
% parts by weight, preferably 5 to 12% parts by weight.

If the wool grease exceeds 20% by weight, the practical performance as a release agent, such as the so-called ease of peeling, will decrease.

The amount of the mineral oil agent in the release agent is 50% or more by weight, preferably 58 to 86% by weight. When the amount is less than 50% by weight, workability decreases. Liquid paraffin is 0.01 to 40% by weight in the stripping agent, preferably 10 to 3 parts by weight.
It is 0% part by weight. If it exceeds 40% by weight, this also shows a decrease in workability.

The mixing method is not particularly specified, but since the melting point of wool grease is 30 to 45°C, wool grease is melted at around 50°C, and mineral oil and liquid paraffin are mixed in advance. It is desirable to add the following when producing the stripping agent of the present invention.

As the application method, the currently used methods such as brushing and spraying are sufficient.

[Example] A release agent adjusted as specified in Table 1 was applied uniformly on an iron plate with a brush, a bottomless cylindrical form with a diameter of 4 cm and a height of 3 cm was placed there, mortar was poured into it, and the mold was left for 24 hours. After curing, the cured product is lifted vertically upwards, and the force at the moment it peels off from the steel plate is measured as the peel resistance, and the performance of the release agent is indicated by the magnitude of the value.

The test results are shown in Table 2.

Next, using a 4cm*16cm*12cm steel formwork, apply a release agent to the inside of the formwork in the same way, pour in mortar, and remove the mold after curing for 24 hours. I checked the weight. The test results are shown in Table 3.

In both tests, commercially available oil-based stripping agent A was used as a comparative example.

[Effects of the Invention] As explained above, the present invention has excellent peeling performance as a stripping agent for concrete metal frames, and also has rust prevention properties, thereby reducing the labor required for maintenance of concrete metal frames. The effect of this method is that the finished hardened concrete becomes more beautiful.

Claims (1)

[Scope of Claims] A release agent for concrete metal frames characterized by blending wool grease obtained during wool refining with a mineral oil-based oil.In the release agent component, the amount of wool grease used is 0.01%.
~20% by weight, a mineral oil-based oil agent used in an amount of 50% by weight or more, and liquid paraffin in an amount of 0.01 to 40% by weight.