JPS6319546B2 - - Google Patents

Description

[Detailed description of the invention]

[Industrial Application Field] This invention applies to coal and coke. This invention relates to coating paints and coating methods for waterproofing, dustproofing, and preventing oxidative deterioration of deposits caused by air when depositing minerals such as iron ore, river sand, and wood powder over a long period of time. [Prior Art] Generally, coal, coke, wood powder, and the like are often deposited in steel mills, gas plants, paper mills, and the like. However, during storage, these deposits tend to stir up dust in the wind, making the work environment worse, and when it rains, the fine powder is washed away, resulting in deposit loss. In addition, especially in the case of coal, coke, iron ore, etc., if water is absorbed during open piling and the water content in the sediment increases, energy loss due to evaporative heat loss of water increases when heating or burning it. In addition, there are problems such as difficulty in controlling heating or combustion due to fluctuations in calorific value. Furthermore, there is also the problem that these deposits are oxidized over time, impairing their original functions. Conventionally, the surface of the above-mentioned open deposits is coated with alumina cement and then coated with resin, a method of spraying asphalt emulsion or an emulsion containing coal tar, and a method of applying vinyl chloride.
Attempts have been made to form a predetermined film on the surface of the deposit by spraying a resin emulsion such as vinyl acetate copolymer emulsion (Japanese Patent Laid-Open No. 59-226095, Japanese Patent Publication No. 59-18431). Publications, etc.). [Problems to be solved by the invention] However, in the method of applying alumina cement and then resin coating, the chemicals are expensive and there is a problem that the combustibility of coal powder etc. is inhibited. . In addition, the method of spraying resin emulsion is as follows.
The water repellency and weather resistance of the film are poor, and methods such as spraying asphalt emulsion have poor film-forming ability, making it difficult to form a strong continuous film.Furthermore, the film remains sticky, which hinders coating workability. There is a problem that I have encountered. Therefore, it is an object of the present invention to solve the above-mentioned conventional problems, and in particular, to provide a surface of open deposits that is inexpensive, has excellent water repellency and weather resistance, has no sticky feeling, and has a combustion resistance against coal powder, etc. By providing a coating paint that can easily form a continuous film that does not impede properties, and a coating method using this paint, the above-mentioned deposits are highly waterproof, dustproof, and prevented from being oxidized and deteriorated by air. The purpose is to [Means for Solving the Problems] As a result of intensive studies to achieve the above object, the inventors decided to mix resin emulsion and asphalt emulsion in a predetermined ratio and spray the mixture on the surface of open deposits. When this is done, it is possible to easily form a continuous film that is inexpensive, has excellent water repellency and weather resistance, has no sticky feeling, and does not inhibit the combustibility of coal powder, etc. This invention was completed after learning that it is highly effective in waterproofing and dustproofing sediments, and preventing oxidative deterioration caused by air. That is, this invention is a first invention relating to a paint for coating field deposits, which is made by mixing a resin emulsion obtained by emulsifying and dispersing a resin in water and an asphalt emulsion obtained by emulsifying and dispersing asphalt in water. , and a second invention relating to a method for coating an open deposit, characterized in that the paint is spread on the surface of the open deposit and then allowed to dry naturally. [Structure and operation of the invention] The resin emulsion used in this invention is a product obtained by emulsifying and dispersing various resins in water and can be naturally dried.Specific examples thereof include polyvinyl acetate emulsion, ethylene-acetic acid emulsion, Vinyl copolymer emulsion, acrylic acid-vinyl acetate copolymer emulsion, vinyl chloride-vinyl acetate copolymer emulsion, acrylic acid-styrene copolymer emulsion, polyacrylic acid emulsion, acrylic acid-butadiene copolymer emulsion, styrene -butadiene copolymer emulsion, etc. The asphalt emulsion to be mixed with the resin emulsion mentioned above is made by emulsifying and dispersing asphalt in water. Various emulsions are used, including those using acids. Specific examples of commercially available products include CPE-1, CPE-2, Assol M, and the like manufactured by Nichirei Kagaku Kogyo Co., Ltd. In the resin emulsion and asphalt emulsion, the concentrations of the resin component and the asphalt component are set within appropriate ranges from the viewpoint of emulsion stability, viscosity characteristics, and the like.
Generally, the resin concentration in the resin emulsion is in the range of 30 to 65% by weight, particularly preferably 45 to 55% by weight, and the asphalt concentration in the asphalt emulsion is in the range of 30 to 75% by weight, preferably 50 to 70% by weight. It's good to have one. This invention is characterized by mixing such resin emulsion and asphalt emulsion, and the mixing ratio is 1 part resin emulsion by weight.
It is preferably in the range of 0.1 to 20, particularly preferably in the range of 0.25 to 5, relative to the asphalt emulsion. The concentration of the resin and asphalt in this mixed solution is in the range of 1.5 to 60% by weight for the resin and 0.15 to 68% by weight for the asphalt. It is desirable that the asphalt content be in the range of 0.04 to 50 to 1. The coating paint of the present invention has the above-mentioned structure, and the film formed by air-drying this paint has good water repellency and weather resistance that cannot be achieved with resin emulsion alone, and which has good water repellency and weather resistance that cannot be achieved with asphalt emulsion alone. It is characterized by being an extremely tough continuous film with almost no sticky feeling. Further, the above-mentioned coating has the advantage that it does not particularly have the disadvantage of inhibiting the combustibility of coal powder and the like. In order to form a film having such characteristics and advantages on the surface of open deposits in the present invention, the above-mentioned coating paint is diluted with water as necessary, and then
It may be sprayed on the surface of the deposit and allowed to air dry. The amount of spraying at this time is 0.5-6Kg/m ²
is appropriate. The thickness of the coating varies depending on the type of deposit, but is generally about 0.05 to 2 mm. Dilution with water is done so that the coating thickness is within the above range, and the coating paint with the resin and asphalt concentrations set within the above range accounts for 1 to 60% by weight of the entire diluted solution. is appropriate. Further, in forming such a film, an appropriate coating aid may be used in combination with the above-mentioned coating material. The most suitable auxiliary agent is water containing alcohol or its derivatives, and by using such an auxiliary agent, it is possible to obtain more favorable results in the waterproof and dustproof properties of the film. can. When using the above-mentioned coating auxiliary agent, generally, only this auxiliary agent is first sprayed on the surface of the open deposit and allowed to air dry, and then the above-mentioned coating paint is sprayed on top of the surface and allowed to air-dry. method is adopted. At this time, the concentration of the alcohol or its derivative in the coating aid is 0.05% by weight or more, preferably in the range of 0.2 to 2% by weight. Further, the amount of this auxiliary agent to be sprayed may be 0.5 to 6 kg/m ² as in the case of the coating paint to be sprayed afterwards. When spraying the coating aid in advance as described above, that is, when using the coating aid as a pre-treatment agent before spraying the coating paint, either the coating paint is mixed into the coating aid or the coating paint is mixed in the coating aid. Alternatively, it is also an effective method to mix either the resin emulsion or the asphalt emulsion that constitutes this paint. Of course, even if such mixing is performed, the coating paint will still be sprayed after this spraying. When mixing the above-mentioned coating paint, resin emulsion or asphalt emulsion into a coating aid, the mixing ratio is relative to the coating aid made by containing 0.05% by weight or more of an alcohol or its derivative in water. It is desirable that the amount of the paint or emulsion to be mixed is 1 to 50% by weight of the entire mixed solution. On the other hand, as another method of using the above-mentioned coating aid, instead of using this aid as a pre-treatment agent, a mixture of this aid and coating paint is sprayed on the surface of the open deposits. A predetermined film may be formed by air drying. In other words, this method omits the need to spray the coating paint again after the drying process. In this method, the mixing ratio of both components is such that the coating material to be mixed with the coating aid made of water containing 0.05% by weight or more of an alcohol or its derivative is in the entire liquid after mixing. A suitable proportion is 1 to 60% by weight. The amount of spraying is the same as above. Alcohols used in the above method include monohydric alcohols having 8 or less carbon atoms such as methanol, ethanol, n-propanol, isopropanol, and n-butanol, propylene glycol, dipropylene glycol, polyethylene glycol, ethylene glycol, Examples include polyhydric alcohols such as diethylene glycol, triethylene glycol, butanediol, 1,5-pentanediol, glycerin, diglycerin, and trimethylolpropane. Further, as derivatives of the above alcohols, ethylene glycol monomethyl ether, ethylene glycol monomethyl ether acetate, ethylene glycol monoethyl ether, ethylene glycol diethyl ether, ethylene glycol isopropyl ether, ethylene glycol monobutyl ether, ethylene glycol monoacetate, ethylene glycol diethyl ether, etc. Examples include acetate, diethylene glycol monomethyl ether, diethylene glycol monoethyl ether, diethylene glycol monoethyl ether acetate, diethylene glycol monoisopropyl ether, and diethylene glycol monobutyl ether. [Effects of the Invention] As described above, according to the present invention, a continuous film with excellent water repellency and weather resistance can be easily formed on the surface of open deposits, so that the deposits can be waterproofed, dustproofed, and It can effectively contribute to prevention of oxidative deterioration. Further, since the coating formed by the above-mentioned method of the present invention does not have a sticky feeling, good results can be obtained in improving the coating workability, and furthermore, the combustibility of coal powder etc. is not inhibited. Furthermore, since the paint according to the present invention uses an inexpensive asphalt emulsion as one of its components, it is also useful for reducing the cost of the paint. [Examples] Below, examples of the present invention will be described in more detail. Example 1 As a resin emulsion, a copolymer emulsion of n-butyl acrylate and styrene in a weight ratio of 65/35 (resin concentration 50% by weight; hereinafter referred to as resin emulsion A) and butadiene and styrene by weight were used. ratio 32/
68 copolymer emulsion (resin concentration 50% by weight;
Hereinafter, this will be referred to as resin emulsion B),
In addition, asphalt emulsion is manufactured by Nichirei Kagaku Co., Ltd. under the trade name CPE-1 (hereinafter referred to as asphalt emulsion A).
Sample No. 1 according to the present invention was prepared by mixing these in the weight ratio shown in Table 1.
-6 coating paints were prepared.

[Table] Comparative Example 1 Sample No. for comparison using only resin emulsion A.
Sample No. 7 was used as a coating paint, and asphalt emulsion A alone was used to prepare a coating coating sample as Sample No. 8 for comparison. Example 2 In order to investigate the coating effects of the coating paints of samples No. 1 to 6, coal (peak down, Australian coal) 2.5
Kg was piled up on a circular iron plate without applying pressure to create a mini model mountain. The surface area of this mountain is 0.1m ²
It was hot. Next, on the surface of this mountain, the second
After spraying the pre-treatment agent with the composition ratio (weight ratio) shown in the table at the amount shown in the table, air drying, and then coat the coating paints of samples No. 1 to 6 with the weight ratio shown in the table. After diluting with water, the mixture was sprayed at the amount shown in the table and air-dried to form a predetermined film. The drying conditions were that both the pretreatment agent and coating paint were air-dried at 20°C for 4 days. In this coating method, the waterproof test of the formed coating was conducted in the following manner for seven coating examples with different pre-treatment agents, coating paints, and spray amounts.The results are shown in Table 2 below. It was exactly as shown. <Waterproof test> 900 ml of artificial precipitation was applied to the mini-model mountain on which the film had been formed at a rate of 100 ml/hour, and the amount of water (W) that permeated the film at that time was calculated using the following formula. W=Ml-Mo/SS S: Surface area of the mini-model mountain (m ² ) Mo: Weight of the mini-model mountain before precipitation (Kg) Ml: Weight of the mini-model mountain after precipitation (Kg) W: Amount of permeated water (Kg) /m ² ) Comparative Example 2 The same coating test as in Example 2 (coating examples 1 and 2) was carried out, except that the coatings of samples No. 7 and 8 were used as coating coatings, and the same waterproofing test was also carried out. The results were as shown in Table 2 below.

[Table] As is clear from the test results in Table 2 above,
It has been found that the coating paint of the present invention and the coating method using the same can form a coating with excellent waterproof properties on the surface of coal powder. In addition,
Based on the above coating test, a coating was actually formed on the surface of an open deposit made of coal powder etc. according to the method of Example 2, and it was found that it had excellent waterproofness and weather resistance, and had no sticky feeling. It was confirmed that a continuous film could be formed and that this would provide advanced waterproofing of deposits, dustproofing, and prevention of oxidative deterioration.

Claims (1)

[Claims] 1. A resin emulsion obtained by emulsifying and dispersing a resin in water;
A paint for covering open deposits, which is made by mixing asphalt emulsion with asphalt emulsified and dispersed in water. 2. The paint for coating field deposits according to claim 1, wherein the resin concentration in the resin emulsion is 30 to 65% by weight, and the asphalt concentration in the asphalt emulsion is 30 to 75% by weight. 3 The mixing ratio of resin emulsion and asphalt emulsion is 1 part resin emulsion to 1 part asphalt emulsion by weight.
The paint for coating open deposits according to claim 1, which has a coating composition in the range of 0.1 to 20. 4 Spraying a coating paint made by mixing a resin emulsion obtained by emulsifying and dispersing a resin in water and an asphalt emulsion obtained by emulsifying and dispersing asphalt in water on the surface of the open deposit, and then allowing it to dry naturally. A method for covering open deposits characterized by: 5. Coating of open deposits according to claim 4, which uses a coating aid consisting of water containing an alcohol or a derivative thereof when spraying the coating paint. Method. 6. The method for coating field deposits according to claim 5, which comprises spraying a coating aid on the surface of the field deposits, allowing the surface to dry naturally, and then spraying a coating paint. 7. The method for coating field deposits according to claim 6, which comprises mixing the coating aid with a coating paint or one of a resin emulsion or an asphalt emulsion constituting this paint. 8. The method for coating field deposits according to claim 5, wherein a coating aid and a coating paint are mixed and sprayed onto the surface of field deposits. 9 Coating paints, coating aids (including those formed by mixing the coating paints with either resin emulsions or asphalt emulsions constituting the coatings), or coating paints and coating aids. 9. The method for coating field deposits according to any one of claims 4 to 8, wherein the amount of the mixed solution is sprayed in a range of 0.5 to 6 kg/ ^m2 .