KR101130207B1 - Coating apparatus and method of preventing water absorption into light weight aggregate - Google Patents

Abstract

PURPOSE: A coating apparatus for blocking lightweight aggregate absorption and a method thereof are provided to prevent water absorption inside pores of the lightweight aggregate by heating and spraying a mixture of resin monomer and initiator using pressure absorption inhibitor in order to coat and dry a surface of the lightweight aggregate. CONSTITUTION: A coating apparatus for blocking lightweight aggregate absorption(1) comprises a drum mixer(20) which is rotatable in order to mix the lightweight aggregate evenly, a heat exchanger(40) which heats and supplies a pressurized absorption inhibitor from one end of the drum mixer to the light weight aggregate, and a hot air generator(50) which supplies hot-air from other end part of the drum mixer to inside the drum mixer. The pressurized absorption inhibitor is a mixture of resin monomers and reactive initiators. The heat exchanger comprises a plurality of paths for supplying resin monomers and reactive initiators respectively and a spray nozzle(43) which sprays the mixture of resin monomers and reactive initiators inside the drum mixer.

Description

Lightweight aggregate absorption prevention coating apparatus and method {COATING APPARATUS AND METHOD OF PREVENTING WATER ABSORPTION INTO LIGHT WEIGHT AGGREGATE}

The present invention is to reduce the absorption rate of light weight aggregates used in concrete, and more particularly, by coating the surface of the aggregates to prevent the absorption of light aggregates to prevent water absorption in the pores inside the light weight aggregates to prevent the change of lightweight aggregates A coating apparatus and method are disclosed.

Light weight aggregates are being researched for weight reduction in structures and concrete secondary products. The absorption rate of such lightweight aggregates is capable of absorbing at least about 20% of water by weight into the pores of the lightweight aggregate. When absorbed water is manufactured by lightweight pump and pumped by pump, the water in the pores is released by the pressure of the pump, and this water acts as surplus water in concrete to separate cement and aggregate, so-called "aggregate separation phenomenon. "Brings about. Aggregate separation generated during pumping by such pumping leads to blockage of pipes, transportation of mortar carrying only cement and sand, etc., and thus, it is a main cause that cannot be used for construction of high-rise structures.

In addition, when lightweight aggregates are used in concrete, water contained in the aggregates is absorbed by the lightweight aggregates in the concrete due to the rise of the aggregates and the pressure of the pump during pumping. A decrease in strength occurs.

Therefore, in order to make the pressure absorbing action smaller, lightweight aggregates are mostly coated with resins, emulsions, etc., but the coated lightweight aggregates are very expensive and the manufacturing method is strictly known as the know-how of each company. The secret is kept.

On the other hand, Korean Patent Application No. 10-1988-0006145 discloses the use of a pressure-absorbing inhibitor for lightweight aggregate and a method of treating the same. This patent uses a water-dispersible acrylic superabsorbent material that swells up to 20 times as the pH of the concrete increases, thereby reducing the change in absorption.However, when the superabsorbent acrylic resin is very expensive and a superabsorbent material is used, a slump of concrete is used. Has the disadvantage of being lowered.

Lightweight aggregate will change the state of concrete when pumped to produce lightweight concrete according to the absorption amount. Accordingly, the lightweight aggregate is coated with an inorganic material such as epoxy or acrylic resin, or the surface of the lightweight aggregate is melted to make a small amount of absorption. In the case of using the epoxy resin instead of the water dispersible acrylic resin, the applicant has a light weight by coating the epoxy resin. It was found that the amount of change in pressure absorption of the aggregate was small.

It is an object of the present invention to provide a lightweight aggregate absorption preventing coating apparatus and method which can easily and conveniently apply resin when coating the surface of a lightweight aggregate with an inorganic material such as epoxy resin.

The present invention provides a means for achieving the above object, a drum mixer capable of inputting, receiving and discharging the light weight aggregate, rotatable so that the light weight aggregate is mixed evenly; A heat exchanger for heating and supplying a pressure-absorbing inhibitor to the injected lightweight aggregate from one side of a drum mixer; And a hot air generator for supplying hot air to promote the pressurization reaction of the injected pressure absorption inhibitor on the other side of the drum mixer to diffuse onto the aggregate surface, thereby providing a lightweight aggregate absorption preventing coating device that enables continuous production of the lightweight aggregate coating. do.

In the present invention, the pressure absorption inhibitor is a mixture of a resin monomer and a reaction initiator or a main agent and a curing agent, and the heat exchanger sprays a plurality of pipes and mixtures thereof supplied with the resin monomer and the reaction initiator or the main agent and the curing agent, respectively, into the drum mixer. It is equipped with the nozzle to make.

In the present invention, the hopper is connected to the inlet of the drum mixer to supply the light weight aggregate before coating, and the outlet of the drum mixer is connected to the conveyor belt to transfer the light weight aggregate is completed, the conveyor belt is different from the light weight aggregate during transport It is configured to give a constant vibration to the belt surface so as not to stick.

The present invention also includes the steps of supplying lightweight aggregate through the hopper into the inlet of the drum mixer; Lowering the viscosity of the resin by heating a mixture of the resin monomer and the reaction initiator or the main agent and the curing agent which are pressure absorption inhibitors through a heat exchanger; Spraying the heated resin monomer with a reaction initiator or a mixture of the main agent and the hardener through a nozzle into a drum mixer; Mixing the sprayed resin monomer with a reaction initiator or a mixture of the main agent and the hardener with a light weight aggregate by rotating a drum mix; Hot hot air to increase the polymerization rate of the resin by a hot air generator to evenly diffuse on the surface of the aggregate and to dry the aggregate surface; And it provides a lightweight aggregate absorption preventing coating method comprising the step of discharging and transporting the light weight aggregate and the coating is complete.

In the present invention, the heating temperature for the mixture of the resin monomer and the reaction initiator or the main agent and the curing agent is maintained at 50 ~ 180 ℃ or 60 ~ 120 ℃, the resin viscosity of 100cps or less, the resin is epoxy, acrylic, unsaturated Preference is given to being selected from the group comprising polyesters and polyurethanes.

As described above, the present invention is a pressure absorption inhibitor through a series of processes for coating and drying the surface of the lightweight aggregate by heating and spraying a resin monomer containing a mineral such as an epoxy resin, a reaction initiator or a mixture of the main agent and a curing agent By preventing water from being absorbed into the pores inside the lightweight aggregate, there is no change in the physical properties of the concrete, and the continuous production of the lightweight aggregate coating becomes easier and more convenient.

1 is a view showing the configuration of a lightweight aggregate absorption prevention coating apparatus of the present invention,
2 is a view showing a process of applying a resin to the surface of the light weight aggregate using the coating apparatus of FIG.
<Description of the symbols for the main parts of the drawings>
1: Lightweight aggregate absorption prevention coating device 10: Hopper
20 drum mixer 21 inlet
22: outlet 23: transfer screw
30: conveyor belt 40: heat exchanger
41,42: pipeline 43: spray nozzle
50: hot air generator 51: blower
S ₁ : Lightweight aggregate S ₂ before coating : Lightweight Aggregate After Coating

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings.

1 is a view showing the configuration of a lightweight aggregate absorption prevention coating apparatus of the present invention, according to the present invention viscosity in the case of a relatively high temperature polymer such as epoxy, acrylic, unsaturated polyester, polyurethane, etc. In consideration of the difficulty in coating due to its high, a lightweight aggregate absorption preventing coating apparatus 1 is provided, which enables spraying by lowering the viscosity of these resins.

Specifically, the coating apparatus of the present invention is configured to realize a lightweight aggregate coating by spraying a resin monomer having a reaction temperature of 50 ° C. or less and 180 ° C. or lower by spraying the viscosity of the resin monomer and the main agent and the curing agent to 100 cps or less by a polymerization reaction heating means.

To this end, the coating apparatus 1 of the present invention includes a heat exchanger 40 as a polymerization reaction heating means, and is configured to supply a resin monomer, a reaction initiator, or a main body and a curing agent as a pressure absorption inhibitor through the heat exchanger 40. . At this time, the resin monomer and the reaction initiator or the main material and the curing agent are supplied through the respective conduits 41 and 42, and after passing through the heat exchanger 40, the ends of the conduits 41 and 42 are nozzles 43. It is connected to and configured to spray the resin monomer and the reaction initiator or the mixture of the main body and the curing agent. In another example, the resin monomer and the reaction initiator or the main material and the curing agent are introduced into the heat exchanger 40 through the respective pipes 41 and 42, and mixed in the heat exchanger and sprayed through the nozzle 43. You may.

The coating apparatus of the present invention includes a drum mixer 20 capable of injecting, accommodating, and discharging lightweight aggregate so that the lightweight aggregate is evenly mixed for quick coating, and at one end of the drum mixer 20, the drum mixer 20. And a heat exchanger (40) equipped with a conduit (41) (42) and a nozzle (spray nozzle) (43) for supplying a resin monomer and a reaction initiator or a main body and a curing agent to the light weight aggregate injected into The other end of the 20 is heated with respect to the interior of the drum mixer 20 to promote the reaction of the resin monomer and the reaction initiator or the main body and the curing agent supplied to the inside of the drum mixer 20 to diffuse to the aggregate surface. Install a hot air generator (50) to supply. Reference numeral 51 in FIG. 1 denotes a 'blower'.

Although not shown separately in the drawing, the drum mixer 20 is centered on the shaft to mix the resin monomer and the reaction initiator or the mixture of the main agent and the curing agent and the lightweight aggregate well heated in the heat exchanger 40 and sprayed through the nozzle 43. It is configured to be rotatable.

In addition, one side and the other side of the drum mixer 20 is provided with an inlet port 21 through which the light weight aggregate S ₁ is supplied before coating and a discharge port 22 through which the light weight aggregate S ₂ after coating is discharged. The inside of the 20 is provided with a plurality of transfer screw 23 toward the discharge port 22 side along the inner wall to allow the discharge of the coated lightweight aggregate (S ₂ ).

The hopper 10 is connected to the inlet 21 of the drum mixer 20 so that the lightweight aggregate S ₁ before the coating is supplied, and the conveyor belt 30 is connected to the outlet 22 so that the coating is completed. Carry (S ₂ ).

As such, the present invention includes a drum mixer 20 rotatably provided, a hopper 10 for supplying light aggregate before coating, and a conveyor belt 30 for transporting light aggregate discharged after coating, and a drum mixer 20. ) Is supplied to the resin monomer heated through the heat exchanger 40 and the mixed solution of the reaction initiator or the main agent and the curing agent through the spray nozzle 43, and also by supplying hot hot air through the hot air generator (50) The mixture of the monomer and the reaction initiator or the main agent and the curing agent was spread evenly on the surface of the light weight aggregate (S ₂ ) to allow the continuous production in the coating of the light weight aggregate.

In the present invention, the drum mixer 20 is preferably installed or configured to set the height of the outlet 22 higher than the inlet 21, wherein the inclination angle is to maintain approximately 30 ~ 70 °. If the angle of inclination is less than 30 °, the input amount of aggregate is too small to be economical, and the time taken to discharge may not be completely coated. If it is larger than 70 °, the resin coating time of the aggregate is sufficient, but the coating thickness Thickening can make light aggregate heavy. On the other hand, the inlet 21 is preferably configured to have a constant inclination angle in the upward direction so that the lightweight aggregate does not flow back.

In addition, the conveyor belt 30 is preferably configured to impart a constant vibration to the belt surface so that the light aggregate does not stick to each other during transport.

Next, a coating method for preventing absorption of light weight aggregate using the coating apparatus of FIG. 1 will be described.

Figure 2 shows a process of applying the resin to the surface of the lightweight aggregate, according to the lightweight aggregate coating method is to supply the lightweight aggregate (S ₁ ) into the inlet 21 of the drum mixer 20 through the hopper 10 Begins at the stage. In the heat exchanger 40 with the input of aggregate, the resin is supplied to the pipe 41 and 42, and the mixed solution of the reaction initiator or the main agent and the curing agent is heated to lower the resin to a viscosity of 100 cps or less (preferably 50 cps or less). , It is sprayed toward the light weight aggregate (S ₁ ) in the drum mixer 20 through the spray nozzle 43.

At this time, 50-180 degreeC or less of heating temperature is preferable, More preferably, it is 60-120 degreeC or less. If the temperature is lower than 50 ° C., the viscosity of the resin monomer and the reaction initiator or the main material and the curing agent is greater than 100 cps, so that coating on the light aggregate is not uniform, and if the temperature is higher than 180 ° C., pyrolysis may occur.

When the mixture of the resin monomer and the reaction initiator or the main agent and the curing agent is sprayed through the spray nozzle 43, the mixture is mixed with the lightweight aggregate S ₁ in the rotating drum mix 20 to form a coating on the aggregate surface, and a hot air generator ( The high temperature hot air supplied in 50) increases the polymerization reaction rate of the resin to evenly spread on the aggregate surface and at the same time dry the coated aggregate surface.

As such, the drying of the surface of the light weight aggregate coated with the resin monomer and the reaction initiator or the mixture of the main material and the hardening agent also has the effect of releasing the aggregates to which the coated aggregates do not stick to each other by resin polymerization and diffusion.

The lightweight aggregate finally coated by the device of the present invention is compared with the existing method, as shown in Table 1 below, the coating thickness is thin and the change in the slump of concrete after pressing is judged to be well suppressed under pressure absorption. do.

Coating material name Coating completion time (hr) Absorption rate (%) Weight change rate after press (%) Slump change in concrete (cm) Example 1 Epoxy resin 4 6 0.1 3 Example 2 Acrylic resin 5 6 0.2 3 Example 3 Water dispersible acrylic 6 5 0.1 3 Comparative Example 1 Water dispersible acrylic 48 6 0.2 4 Comparative Example 2 Epoxy resin 24 6 0.1 3

In Table 1, Examples 1 to 3 are coated by the device of the present invention, and Comparative Examples 1 to 2 are coated by an existing method of dipping.

In addition, as a result of comparing the time of the entire process, the dipping method of the conventional method takes an average of 1 to 2 days after the coating (drying time (the time taken until there is no change in weight due to drying), while the coating according to the present invention The overall time was reduced to about 5 hours, saving about 10 times the time, which was evaluated as a very effective coating method.

Therefore, when coating the lightweight aggregate according to the present invention can be coated very easily and inexpensively, it is expected to be used in a variety of structures and the like by inhibiting the absorption prevention by the pressure of the lightweight aggregate.

Claims (5)

A drum mixer rotatable so as to be able to input, receive and discharge light weight aggregates, and to mix the light weight aggregates evenly;
A heat exchanger for heating and supplying a pressure-absorbing inhibitor to the light weight aggregate introduced into the drum mixer from one end of the drum mixer; And
Light weight to enable continuous production of light weight aggregate coating from a configuration including a hot air generator for supplying hot air into the drum mixer to promote the pressurization reaction of the injected pressure absorption inhibitor from the other end of the drum mixer to diffuse on the aggregate surface Aggregate absorption prevention coating device. The method of claim 1,
The pressurized absorption inhibitor is a mixture of a resin monomer and a reaction initiator, and the heat exchanger includes a plurality of pipes to which the resin monomer and the reaction initiator are supplied, and a nozzle for spraying the mixture thereof into the drum mixer. Aggregate absorption prevention coating device. 3. The method according to claim 1 or 2,
A hopper is connected to the inlet of the drum mixer to supply light weight aggregate before coating, and a conveyor belt is connected to the outlet of the drum mixer to transfer the light weight aggregate which has been coated. Lightweight aggregate absorption prevention coating device, characterized in that a constant vibration is applied to the belt surface. Supplying lightweight aggregate through the hopper into the inlet of the drum mixer;
Heating the mixture of the resin monomer, which is a pressure absorption inhibitor, and a reaction initiator through a heat exchanger to lower the viscosity of the resin;
Spraying a mixture of the heated resin monomer and a reaction initiator into a drum mixer through a nozzle;
Mixing a mixture of the sprayed resin monomer and the reaction initiator with the light aggregate by rotating the drum mix;
Hot hot air to increase the polymerization rate of the resin by a hot air generator to evenly diffuse on the surface of the aggregate and to dry the aggregate surface; And
A lightweight aggregate absorption preventing coating method comprising the step of discharging and transporting the light weight aggregate is complete coating and drying. The method of claim 4, wherein
The heating temperature for the mixture of the resin monomer and the reaction initiator is maintained at 50 ~ 180 ℃, the viscosity of the resin is maintained at 100 cps or less, the resin is selected from the group comprising epoxy, acrylic, unsaturated polyester and polyurethane Lightweight aggregate absorption prevention coating method, characterized in that.

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