HU204460B - Apparatus and method for "in situ" filling small-size slots and gaps - Google Patents

Abstract

The present invention relates to an apparatus and method for filling and sealing small gaps and cracks on site. The device according to the invention is connected to a sealing material preheating unit (2) provided with a heat regulator (3) with a reservoir of sealant components (1), to which a sealing component ratio adjustment unit (6) is attached. The apparatus is characterized in that it is provided with an air preheating unit (9) connected to a metering gun (7) provided with a conveyor (15) and a mixing unit (16) via an air supply line. According to the invention, a seal is provided to heat the gap wall by warm air blowing and then to provide a sealed sealant in the gap and to solidify there. (Figure 1) Figure 1 EN 204 460 B Scope of the description: 6 oldcd (Figure 2 of this betile)

Description

The biggest disadvantage of these devices is that in cold weather, when the wall temperature of the slots is very low and the viscosity of the sealing resins is greatly increased - it cannot be used for field seals.

In such circumstances, the sealant cannot penetrate into thin slits, cracks, and even crosslinking resins or foams, if any, will slow down to a great extent.

U.S. Patent No. 4,527,712 discloses an apparatus for dispensing liquid compositions comprising a unit having a leech 15 for preheating a component of a spray seal.

In our experiments, we have found that such a device is not suitable for sealing small gaps or cracks, since the small amount of sealant supplied cannot fill the gap evenly. .

It is an object of the present invention to provide an apparatus and method for locally sealing small tolerances and cracks at any outside ambient temperature, such as minus 15 ° C, even at ambient temperature.

The object is achieved by using a special sealing process. The process is characterized by heating the wall of the gap or crack to be filled to at least 12 ° C by blowing warm air, optionally sealing the gap or crack on one side with a film, a fast-setting resin, putty or foam layer and / or fiber reinforcement. then place a sealant mixture preheated to 20-60 ° C in the space to be filled and allow it to solidify in the gap 35 or in a cracked crosslink.

The method according to the invention is suitable for sealing gaps and cracks which are open on one or two sides.

The device according to the invention has a sealing compound dispensing pen with sealing component storage tanks, pre-heating units with a temperature regulator, sealing material supply lines, sealing component proportion adjustment unit, and a spring-loaded ball valve, sealing component mixing and mixing unit 45

The device according to the invention is characterized in that it is provided with an air preheating unit, connected to a metering gun with an air supply conduit and a mixing unit 50.

Figure 1 illustrates related elements of the apparatus of the invention.

Figure 2 illustrates shut-off and non-return valves 55 in the metering gun.

THE 3. Fig. 2B shows a dispensing gun, A 'and ^ sealant components, a matching unit and a mixing tube with mixing elements.

The device of the invention, θθ, having a sealing material of 1, A "and 3" is an object of the invention, an apparatus and a method for filling and sealing small gaps and cracks in situ.

The construction, assembly, mechanical and vehicle industries, etc. in many cases small cracks and gaps need to be removed and filled.

The materials that can be used to fill the gap can be divided into the following groups:

- Kits, pastes (for drying oils or resins)

- Profflos bands, cords (of artificial rubber, of PVC)

- materials that can be foamed or crosslinked by chemical reaction (polyurethane foams, polyester, epoxy, polysulphide, acrylate resins, etc.)

In the construction industry, two major trends have evolved for the various gap filling processes. One is the joints containing profiled ribbons and cords. In these cases, the gaps are closed by a rubber or PVC cord of a given cross-section, usually extruded. However, they quickly age, lose their elasticity, crack, crumble. They are resistant to repetitive heat loads and outdoor conditions. Therefore, they are permanently inadequate for this purpose.

Also known as "prefabricated" joints is a strip where a strip of preformed plastic foam is applied to the gap to be sealed. Hungarian Patent No. 177,838 provides prefabricated polyurethane foams for sealing purposes which have been impregnated with bitumen. The disadvantage of this seal is that it does not adhere to the wall of the gap and quickly ages. Transition Solution Description No. 2412 087 of the US Patent. In this process, grooves are formed on opposite surfaces of two adjacent building blocks and a hose is placed there. The hose is filled with binder. The disadvantage of this process is that when the binder solidifies, the hose may be displaced, so that its sealing is insecure. The hose, which is usually made of rubber, is aging and needs to be replaced periodically. However, the main disadvantage is that there is no adhesive connection between the wall and the hose. A similar procedure is described in Hungarian Patent No. 176238.

Water-swellable gaskets can be prepared according to Hungarian Patent Nos. 177,363 and 181,775, which are suitable for testing the Joint Gaps of Concrete and Reinforced Concrete Elements. The disadvantage is the limited application and the delicate technology, since the seal is made by water. As a result, this method was not widely used in eL

Another more convenient way of sealing joints and slit closures is to close the slits and joints by spot filling. This is advantageous because the gap can be completely filled, perfectly adhered to the wall and additionally elastic joint.

Most of the plastic foam or resin used for sealing is introduced into the gap to be sealed using a special mixing gun (dosing gun).

Such a mixing gun or. the associated units are described in 173 905, 170 601, 187 679 and 183

EN 204 460 Β slurry tank, sealer preheating unit 2 with thermostat 3, seal component ratio adjuster and pump unit, air preheater unit 9 from air source 8, air and sealer conduit 5 and 4 connected thereto there is a feeding gun 7 attached to it.

Fig. 2 shows a threaded spindle 10 provided with a seal 11 in the dispensing gun which, when screwed in, pushes the ball valve 13 onto the seat 14 via the spring 12. This is to prevent the sealant components from flowing back into the gun. When unscrewing the threaded spindle 10, the ball valve 13 acts as a non-return valve against the spring 12 and prevents one component from being wound in the conveying line of the other component, thereby causing the material to cure (harden in the gun).

Fig. 3 shows a mixing unit 15 of sealant components with a mixing element 15 and mixing elements 16 within the dispensing gun 7. The elements 15 and 16 are held together by a clamping nut 17.

In the process of the present invention, when a polyester or epoxy resin sealant is used, component A is the resin itself while component B is the accelerator and catalyst.

If a polyurethane foam is used as a sealant, component B is a polyisocyanate, component A is a polyol. The sealing process of the present invention is performed by blowing warm air at 60-80 ° C into the slits, preferably 0.1 to 5 mm thick, for 5-7 minutes with the aid of a pistol. Thus, the wall of the slots is heated to at least 12 'C. Then, in the apparatus of Figure 1, the sealant components are heated to 25-60 ° C, adjusted to the required ratio of components A 'and' B ', and the gun is pressed into the live-walled gap with a gun to lower the viscosity. let it cure in the gap and solidify.

By blowing warm air, we can not only heat the wall of the gap, but also remove the accumulated dust and moisture. The heated viscous viscosity sealant can evenly fill the gap, even penetrating into the hairline cracks and curing and curing in an optimal time.

According to the invention, the sealing or coating material can be applied to a variety of surfaces using an apparatus. The material can be applied to the surface or surface gaps by injection, molding, spraying.

The device also makes the resin suitable for use as a topcoat when applied by brush or roller over the surface to be coated.

If the sealant is pressed into a thicker gap, it is advisable to place a fiber reinforcement, preferably glass fiber or metal fiber, in the already heated gap before filling. If the task is to seal open space on two sides, it is advisable to seal the gap on one side with foil. Sealing the space to be sealed from one side can also be achieved by applying and solidifying a fast-setting layer of sealant, putty or plastic foam.

The advantages of the process according to the invention are as follows.

- Can also be used at temperatures below 0 'C for on-site sealing, coating, and work.

- Provides perfect gap, crack filling, even in the case of thin, deep or intricately shaped gaps and cracks.

- can also be used with sealants of various viscosities and cure times.

- Optimum mixing and crosslinking of low weight sealants can also be achieved.

- No special solvent (eg dilution) should be used in the process.

The advantage of the docking according to the invention is that:

- it can also be used for quick-setting, difficult to handle, hazardous sealants;

- the equipment is easy to dismantle and clean;

- it becomes impossible for the sealant to attach to the device.

The following examples illustrate the process of the invention.

Example J.

On a concrete pillar, the task is to seal a crack 70 mm long with an average thickness of 1 mm and open on one side.

The sealant used is polyurethane foam (tradename Kemipur; manufactured by BASF), which is prepared from on-site foaming of components A and B, polyol and polyisocyanate.

Temperature +10 'C.

la) The on-site foaming and sealing is carried out without the use of preheating using known equipment and processes (described in Hungarian Patent Application No. 187,679). The density of the foam produced was 50 kg / m ³ , the gap filling and sealing were not perfect.

1b) Using the apparatus of Figure 1, the slit is blown with 80 'Cos of air for 10 minutes. Thus, the wall of the gap is heated to 16 ° C. Then, the components A 'and B, heated to 30' C, are mixed into the gap. The resulting foam fills the gap in 30 minutes, the measured foam density is 30 kg / m ³ , and the Plot Fill and Seal are perfectly even and free of defects.

Example 2

The procedure of Example 1b) is repeated, but using component A as a polyester resin, component B as a mixture of benzoyl peroxide and cobalt naphthenate.

Compared to the conventional method (la), ebHU 204460 Β achieves even more perfect gap filling.

Example 3

A gap of 0.5 m long, with an average thickness of 3 mm, of variable thickness is detected around the operating cold store fan. The slit is sprinkled externally at 22 ° C with polyurethane foam to seal it from the outside. In the case of top sealing, the procedure of Example 1 b) is followed, but a reinforcement of synthetic fiber is also inserted in the gap. The internal temperature is minus 18 ° C. The starting materials were heated to 25 'C (set temperature 25 + 18 43' C). Thus, foaming can be performed. The piece seal has excellent adhesion, which is very important due to vibration.

Claims (4)

An apparatus for locally filling small gaps and cracks, the containers (1) for sealing component components connected to a sealing material preheating unit (2) provided with a temperature regulator (3), to which is attached a sealing component ratio adjusting pump (6), the air is provided with a preheating unit (9) which is connected to a metering gun (7) via an air conveying pipe (5) with a condenser (15) and a mixing unit (16). A method of filling small openings or cracks in one or two sides with a resin or resin foam composition comprising heating the gap or crack wall to a temperature of at least 12'C by spraying hot air, optionally with a film on one side, sealed with a layer of fast-setting resin, putty, or foam material and / or reinforced with fibrous material - then a filler mixture preheated to 20-60 ° C is applied to the space to be filled and left to cure or cure in the gap or crack. The process according to claim 3, characterized in that the sealant is a mixture of a polyester resin and a catalyst and an accelerator. The process according to claim 3, wherein the sealant is a two-component on-site foamed polyurethane foam.