JPS62285963A - Paint for use in coating open-air stored cargo and coating method - Google Patents

Abstract

PURPOSE:To obtain a paint for use in coating open-air stored cargo, which is inexpensive and effective as a waterproofing and dust-proof coat and can prevent the cargo from being deteriorated by air oxidation, by mixing an aq. emulsion of a resin with an aq. emulsion of asphalt. CONSTITUTION:A paint for use in coating is obtd. by mixing a resin emulsion, obtd. by emulsifying and dispersing a resin in water, with an asphalt emulsion obtd. by emulsifying and dispersing asphalt in water. In said resin emulsion and in said asphalt emulsion, the concn. of the resin and the asphalt is adjusted to a proper value from the viewpoints of emulsion stability and viscosity characteristics. Generally, the concn. of the resin in the resin emulsion is 30-65wt% and that of asphalt in the asphalt emulsion is 30-75wt%. The resin emulsion is mixed with the asphalt emulsion in a weight ratio of resin emulsion to asphalt emulsion of 1 to 0.1-20.

Description

[Detailed Description of the Invention] 3. Detailed Description of the Invention [Industrial Application Field] This invention is a method for depositing coal, coke, iron ore, minerals such as river sand, wood powder, etc. in open piles over a long period of time. This article relates to coating paints and coating methods for waterproofing and dustproofing deposits, preventing oxidative deterioration caused by air, etc.

[Conventional technology]

In general, 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. Additionally, there are problems such as difficulty in controlling heating or combustion due to fluctuations in calorific value. Furthermore, these deposits are orally oxidized and
There is also the problem that the original function is impaired.

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-vinyl acetate. Attempts have been made to form a predetermined film on the surface of the deposit by spraying a resin milky lotion such as a copolymer emulsion (Japanese Unexamined Patent Publication No. 59-226095, Japanese Patent Publication No. 59-18).
431, etc.).

[Problem that the invention seeks to solve]

However, in the method of applying resin coating after applying alumina cement, there is a problem that not only the chemicals are expensive, but also the combustibility of coal powder etc. is inhibited. In addition, the method of spraying resin emulsion has poor water repellency and weather resistance, and the method of distributing asphalt emulsion has poor film-forming ability, making it difficult to form a strong continuous film, and the film has a sticky feel. There is a problem in that the remaining residue impedes coating workability.

Therefore, it is an object of the present invention to solve the above-mentioned problems of the prior art, and in particular, to apply it to the surface of open deposits at low cost, with excellent water resistance and weather resistance, without sticky feeling, and with combustibility against coal powder, etc. By providing a coating paint that can easily form a continuous film that does not inhibit
The purpose is to highly prevent oxidative deterioration caused by air.

[Means for solving problems]

As a result of intensive studies to achieve the above object, the inventors discovered that a method of spraying a mixture of resin holes and asphalt emulsion at a predetermined ratio on the surface of open deposits was achieved at low cost. 1B It has excellent water resistance and weather resistance, and can easily form a continuous film that does not have a sticky feel and does not inhibit the combustibility of coal powder, etc., making it waterproof, dustproof, and oxidized by the air. After learning that Uruchino is highly effective at preventing deterioration, he completed this invention.

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 G is a product obtained by emulsifying and dispersing various resins in water and can be naturally dried.
Specific examples include polyvinyl acetate emulsion, ethylene-vinyl acetate copolymer emulsion, acrylic acid-vinyl acetate copolymer emulsion, vinyl chloride-vinyl acetate copolymer emulsion, acrylic acid-styrene copolymer emulsion, and polyvinyl acetate copolymer emulsion. Examples include acrylic acid emulsion, acrylic acid-butadiene copolymer emulsion, and styrene-butadiene copolymer emulsion.

The asphalt emulsion to be mixed with the resin emulsion mentioned above is one made by emulsifying and dispersing asphalt in water, and includes the type that uses an alkylbenzenesulfonic acid and an inorganic base during emulsification, or the type that uses an alkyl-substituted alkylene diamine and an inorganic base. 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 Kugo Kagaku Kogyo Co., Ltd.

In the resin emulsion and the asphalt emulsion, the concentrations of the resin component and the asphalt component are set within appropriate ranges from the viewpoint of emulsion stability and viscosity characteristics.

Generally, the resin concentration in the resin emulsion is 30 to 65% by weight,
The asphalt concentration in the asphalt emulsion is particularly preferably 45 to 55% by weight, preferably 30 to 75% by weight, and preferably 50 to 55% by weight.
It is preferably in the range of 70% by weight.

The present invention is characterized in that such a resin emulsion and an asphalt emulsion are mixed, and the mixing ratio is in the range of 0.1 to 20 asphalt emulsion to 1 resin emulsion, particularly. It is preferably in the range of 0.25 to 5. The concentration of the resin and asphalt in this mixed liquid is in the range of 1.5 to 60% by weight for the resin and 0.15 to 68% by weight for the asphalt, and the ratio of the asphalt to the resin is in the range of 1.5 to 60% by weight. The ratio of asphalt content to 1 resin content is preferably in the range of 0.04 to 50.

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 this invention, in order to form a coating having such characteristics and advantages on the surface of open deposits, the above-mentioned coating paint is diluted with water as necessary, and then sprayed on the surface of the deposits and naturally Just let it dry. The appropriate amount of spraying at this time is 0.5 to 6 kg/m. The thickness of the coating is
It varies depending on the type of deposit, but generally 0.05
It is preferable to set it to about 21A1. 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 diluted metal body. 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.

The concentration of alcohol or its derivative in the coating aid at this time is 0.05% by weight or more, particularly 0.2 to 2% by weight.
A weight percent range is desirable. In addition, the amount of spraying of this auxiliary agent is
As in the case of the coating paint to be sprayed afterwards, 0.5~
It may be 6 kg/m.

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 as follows: A coating aid containing 0.05% by weight or more of an alcohol or a derivative thereof in water. 1 to 50% by weight of the above-mentioned paint or emulsion to be mixed in the formed metal body after mixing.
It is desirable that the proportion of

On the other hand, as another embodiment using the above-mentioned coating aid,
Instead of using this auxiliary agent as a pre-treatment agent, a mixture of this auxiliary agent and a coating paint may be sprayed on the surface of the open deposits and allowed to air dry to form a predetermined film. good. In other words, this method omits the need to spray the coating paint again after the drying process. The mixing ratio of both components in this method is 0.05% by weight in water.
It is appropriate that the coating material to be mixed with the coating aid containing the above-mentioned alcohols or derivatives thereof accounts for 1 to 60% by weight of the mixed metal body. . The amount of spraying is the same as above.

Alcohols used in the above method include alcohols having m carbon atoms of 8 or less, such as methanol, ethanol, n-propanol, isopropanol, and n-butanol, propylene glycol, dipropylene glycol, polyethylene glycol, Examples include polyhydric alcohols such as ethylene glycol, diethylene glycol, triethylene glycol, butanediol, 1,5-bentanediol, 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,
Examples include ethylene glycol isopropyl ether, ethylene glycol monobutyl ether, ethylene glycol monoacetate, ethylene glycol diacetate, diethylene glycol 7-methyl ether, diethylene glycol 7-ethyl ether, diethylene glycol monoethyl ether acetate, diethylene glycol monoisopropyl ether, and diethylene glycol monobutyl ether.

〔Effect of the invention〕

As described above, according to the present invention, it is possible to easily form a continuous film with excellent water resistance and weather resistance on the surface of open deposits, so that the deposits can be waterproofed, dustproofed, and prevented from oxidative deterioration. It can be effectively contributed to.Also,
Since the coating formed according to 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.

〔Example〕

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 5
0% by weight; hereinafter referred to as resin emulsion A) and a copolymer emulsion of butadiene and styrene in a weight ratio of 32/68 (resin concentration 50% by weight; hereinafter referred to as resin emulsion B).
), and as an asphalt emulsion,
Sample light 1 according to the present invention was prepared by using CPE-1 (trade name, manufactured by Kogo Kagaku Co., Ltd., hereinafter referred to as asphalt emulsion A) and mixing these in the weight ratio shown in Table 1.
-6 coating paints were prepared.

Table 1 Comparative Example 1 Only resin emulsion A was used as a paint for coating sample light 7 for comparison, and asphalt emulsion A alone was used as a paint for coating sample light 8 for comparison.

Example 2 In order to investigate the coating effect of the coating paint for sample lights 1 to 6, 2.5 kg of coal (peak down, Australian coal) was piled up on a circular iron plate without applying pressure to create a mini model mountain. . The surface area of this mountain was 0.1 m. Next, on the surface of this mountain, a pretreatment agent having the composition ratio (weight ratio) shown in Table 2 below is sprayed at the amount shown in the same table, and then air-dried. The coating paint was diluted with water at the weight ratio shown in the same table, then sprayed at the amount shown in the table, and allowed to air dry to form a predetermined film.

The drying conditions are 20℃ for both the pretreatment agent and coating paint.
, and air-dried for 4 days.

In this coating method, the waterproof test of the formed film 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 as shown.

Waterproofing test> 900 ml of artificial precipitation was applied to the mini-model mountain on which the film had been formed at a precipitation rate of 100 mff/hour, and the amount of water (W) that permeated through the film was calculated using the following formula. did.

ME-M.

S: Surface area of the mini model mountain (n?) Mo: Weight of the mini model mountain before precipitation (kg) Ml: Weight of the mini model mountain after precipitation! (kg) W ; Permeated water amount (kg
/m) Comparative Example 2 Except for using the paints of samples 7 and 8 as coating paints,
The same coating tests as in Example 2 (Coating Examples 1 and 2) and the same waterproof test were conducted, and the results were as shown in Table 2 below.

As is clear from the test results in Table 2 above, the coating paint of the present invention and the coating method using the same can form a waterproof coating on the surface of coal powder. I understand. 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 also had a good adhesive feel. It was confirmed that it was possible to form a continuous film without any sludge, thereby making it possible to achieve a high degree of waterproofing of deposits, dustproofing, and prevention of oxidative deterioration.

Claims (9)

[Claims] (1) A paint for covering 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. (2) The resin concentration in the resin emulsion is 30-65% by weight, and the asphalt concentration in the asphalt emulsion is 30-75% by weight.
A paint for coating field deposits according to claim (1). (3) The mixing ratio of resin emulsion and asphalt emulsion is 0.1 to 20 asphalt emulsion to 1 resin emulsion by weight.
A paint for coating field deposits according to claim (1). (4) After spraying a coating paint made by mixing a resin emulsion made by emulsifying and dispersing a resin in water and an asphalt emulsion made by emulsifying and dispersing asphalt in water on the surface of the open deposit, dry it naturally. A method for covering open deposits, characterized by: (5) An open field according to claim (4), which is obtained by using a coating aid made by adding an alcohol or a derivative thereof to water together with the coating paint when spraying the coating paint. Method of covering deposits. (6) The method for coating field deposits according to claim (5), wherein a coating aid is sprayed on the surface of the field deposits, the coating aid is air-dried, and then a coating paint is sprayed. (7) A method for coating field deposits as set forth in claim (6), which comprises mixing a coating auxiliary agent with a coating paint, or either 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 paint, coating aid (including a mixture of the coating paint or either resin emulsion or asphalt emulsion constituting the coating), or coating paint and coating aid. The amount of spraying of the mixture with the agent is 0.5 to 6 kg.
/m^2. The method for coating open deposits according to any one of claims (4) to (8).