JPH0249360B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to an agent for suppressing an increase in moisture content of open piled coal. In recent years, energy and resource conservation have been called for in the wake of oil shocks, and at the same time, as coal has regained its position as an energy source, its usage has also been on the rise. Along with this, various issues related to coal storage have also been brought into focus. For example, various countermeasures are being considered, such as preventing coal dust from scattering, preventing heat generation, and preventing deterioration. However, no serious measures have yet been taken to prevent rainwater from seeping into open coal piles. The increase in water content due to the infiltration of rainwater in open piled coal not only consumes extra energy for water evaporation, resulting in large economic losses, but also has various negative effects on the coke manufacturing process in the case of coking coal. Therefore, even if the increase in moisture content of coal due to rainwater is suppressed by 1%, it will bring about great benefits. Under such circumstances, it is an object of the present invention to provide an inexpensive and excellent inhibitor of increase in moisture content of open coal. That is, the present invention is an agent for suppressing an increase in the water content of piled coal, which contains as an active ingredient a cationic oil-in-water resin emulsion containing a polymer obtained by polymerizing a cationic monomer and a hydrophobic monomer. The cationic oil-in-water resin emulsion, which is the active ingredient of the present invention, can be obtained by emulsion polymerization of a cationic monomer and a hydrophobic monomer. As the cationic monomer, (meth)acryloylkioethyltrimethylammonium chloride, (meth)acrylamidopropyltrimethylammonium chloride, vinylpyridine, etc. are used, and as the hydrophobic monomer, vinyl acetate, acrylic acid ester, etc. are used. , styrene, ethylene,
Butadiene, vinyl chloride, vinylidene chloride, etc. are used. A cationic surfactant or a nonionic surfactant can be used as an emulsifier in emulsion polymerization. Both can also be used together. As the cationic surfactant, primary amine salts, secondary amine salts, tertiary amine salts, and quaternary ammonium salts having an aliphatic hydrocarbon group having 12 or more carbon atoms are used, and among these, , quaternary ammonium salt type is preferred. Examples of the quaternary ammonium salt type cationic surfactant include uralyltrimethylammonium chloride, cetyltrimethylammonium chloride,
Examples include stearyltrimethylammonium chloride. As the nonionic surfactant, polyoxyethylene alkyl phenyl ether or polyoxyethylene alkyl ether can be used.
Emulsion polymerization involves stirring and dispersing cationic monomers and hydrophobic monomers together with an emulsifier in water, heating while blowing nitrogen gas, and adding a catalyst such as benzoyl peroxide, persulfate, or hydrogen peroxide. and do it. In the copolymer of a cationic monomer and a hydrophobic monomer, the proportion of the cationic monomer is usually about 1 to 5 mol%. The moisture content increase inhibitor for open piled coal of the present invention is usually used at a concentration of 5 to 10% resin content, and for open pile coal, the resin content is 25 to 25% per square ^meter of coal pile surface.
Spread 200g, preferably 50-100g. that time,
It is best to use a spreader to spread it evenly over the entire surface of the coal pile. Note that the chemical may be sprayed only once, or may be sprayed multiple times. It may also be used as follows. When a coal pile is formed, it is spread on the conveyor belt to the coal that is being transported and forms the surface layer of the pile. When the coal pile is formed, all of the coal being transported is spread on the conveyor belt. After forming a coal pile by performing the spraying described in or, further spraying is performed on the surface layer of the coal pile. When the moisture content increase inhibitor for open coal of the present invention is sprayed on open coal, the formation of a resin film is promoted due to the interaction between the negatively charged part on the surface of the coal and the cation part on the surface of the emulsion particles. It combines strongly with coal and strengthens the surface of the coal pile.
It also hydrophobicizes the coal on the surface of the coal pile. Therefore, internal infiltration of rainwater can be prevented, and an increase in the moisture content of coal can be suppressed. Furthermore, since the film is strong, it can also be expected to prevent coal piles from collapsing due to heavy rainfall. Next, the present invention will be explained in detail with reference to Examples. Example 4 Goonyera charcoal 3 passed through mesh sieve
Kg is piled up in a conical shape on a circular container (diameter 30 cm) that can separate surface water and permeated water, and various resin emulsions shown in Table 1 are added to this at a resin concentration of 5%.
After adjusting the amount, it was evenly spread and air-dried indoors for 3 days. Next, after exposing this to artificial rain with a rainfall intensity of 10 mm/hr for 20 hours, the amount of surface water, amount of permeated water, and change in weight of the piled coal (difference in weight before and after rain) were measured to determine total moisture and permeation rate. . The results are shown in Table 2. The total moisture after rain was calculated from the total moisture before rain and weight change using the following formula. Total moisture after rain (%) = Coal weight before rain (g) x Total moisture before rain (%) x 10 ^-2 + Weight change (g) / Coal weight before rain (
g)+weight change (Δg)×100 In addition, the penetration rate was calculated using the following formula. Permeability % = Permeated water amount (g) + Weight change (Δg) / Surface water amount (g) + Permeated water amount (g) + Weight change (Δg) × 100

【table】

【table】

[Table] Represents trimethylammonium chloride.

【table】

[Table] From Table 2, cationic resin emulsions containing a cationic monomer copolymerized with a hydrophobic monomer in the resin component have a cationic or nonionic surfactant in the nonionic resin component. It can be seen that the permeability and total water content are lower than that of the resin emulsion emulsified with the resin emulsion, and the effect of suppressing the increase in the moisture content of coal is excellent.

Claims (1)

[Claims] 1. An inhibitor for increasing the water content of piled coal, the active ingredient of which is a cationic oil-in-water resin emulsion containing a polymer obtained by polymerizing a cationic monomer and a hydrophobic monomer.