JP2006231311A - Method of depositing inorganic foam layer - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method of depositing an inorganic foam layer by spraying, heating and foaming a siloxane/silanol salt-high molecular weight solution and forming a fusion deposition layer on a target surface with the heat-fusion property. <P>SOLUTION: The siloxane/silanol salt-high molecular weight solution of a molecular weight of 4,000 to 8,000 containing solid content of 20 to 35 wt% and water of 65 to 80 wt% is mixed with a heated/pressurized air heated and pressurized at 300°C or more, is sprayed from an orifice of a desired diameter, and is heated and foamed to a desired grain size, and is fused and deposited on the target surface with the heat-fusion property to coat and form the inorganic foam layer. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a coating formation method for an inorganic foam layer, which can easily and inexpensively form an inorganic foam layer having fire resistance, nonflammability and excellent heat insulation.

  The outer wall or inner wall of the current building or facility, etc., or the outer surface of various devices, particularly the cooling and heating device, is designed to prevent the loss and dissipation of cooling energy and to save energy, and to adapt to these walls and outer surfaces. As a heat-insulating plate material or heat-insulating sheet material that is flexible, easy to process, inexpensive, and excellent in heat insulation, a foamed plate material using a synthetic resin material such as polystyrene, polyethylene, polypropylene, polyurethane, or polyphenol resin Foamed sheet materials have been mainly used.

  However, as in today's environment, there is a strong demand for environmental protection on one side, and on the other hand, these synthetic resins are required to have high-rise and large-sized buildings and facilities, as well as the safety associated with increasing age. Foamed plate materials and foam sheet materials cannot be disposed of even after use, and incineration must be carried out using separate collection and special incineration means. Even when it is used as a heat insulating plate for buildings and facilities, once a fire breaks out, smoke and harmful gases are generated along with a severe fire, resulting in the loss of many lives every year.

  In such a situation, the inventors have found that coal ash, cast waste sand, volcanic ash as natural ejected matter, etc. in inorganic industrial waste contains a large amount of silicon oxide in its composition and the silicon oxide is Based on the fact that sodium silicate so-called water glass can be easily dissolved by an alkali agent, and the molecular weight is increased by the condensation action of silanol groups of the water glass. Of siloxane and silanol salts having a molecular weight of about 4,000 to 8,000 and a molecular weight of about 4,000 to 8,000 can be produced.

  In the siloxane and silanol salt multi-molecular weight solution, it is possible to produce a foam structure due to moisture evaporation by heating at 100 ° C. or higher, and at the high temperature of at least 300 ° C., the foam is heated and foamed in a short time and exhibits heat fusion properties. Therefore, the present inventors have found that the inorganic foam layer can be applied and formed efficiently with an appropriate shape and thickness by spraying on the wall surface of the building or facility or the outer surface of the cooling / heating device.

  A siloxane and silanol salt multimolecular weight solution having a solid content of 20 to 35% by weight, a water content of 65 to 80% by weight and a molecular weight of 4,000 to 8,000 is sprayed and foamed by heating, and its heat fusion property Thus, the present invention provides a coating formation method for an inorganic foam layer, which can be easily and inexpensively formed by fusion coating on a surface to be coated.

  The technical means used by the present invention in order to solve the above-mentioned problem is to cause the silanol groups of the siloxane and silanol salt solution having a solid content of 20 to 35% by weight and moisture of 65 to 80% by weight to condense, An orifice having a required pore size in heated and pressurized air in which a siloxane and silanol salt multimolecular weight solution having a molecular weight of 4,000 to 8,000 is heated to at least 300 ° C. or higher. The mixture is mixed on the front surface and sprayed from the orifice to be heated and foamed to the required particle size, and with its heat-fusibility, it melts while spraying on the adherend surface such as the wall surface of buildings or facilities or the outer surface of the cooling device. The present invention resides in a method of coating and forming an inorganic foam layer having a required shape and thickness by suppressing the foaming ratio by lowering the temperature.

  Furthermore, after spraying from the orifice, the effect of outside air is eliminated, the foam is sufficiently heated and foamed, and the heat-fusing property is maintained to achieve strong coating and efficient fusion coating on the adherend surface. For this purpose, the siloxane and silanol salt multi-molecular weight solution sprayed from the orifice lies in a method of spraying into a spray protection cone formed at a wider angle than the spray angle.

  The present invention uses such technical means, and the material used is composed of a siloxane and silanol salt multi-molecular weight solution, and the composition thereof is 20 to 35% by weight of siloxane and silanol salt solids, and moisture is 55 to 80%. Since it has a relatively low viscosity of wt%, even if it is mixed with heated and pressurized air and sprayed from an orifice with a pore diameter, the heated and pressurized air for spraying is heated to a high temperature of at least 300 ° C or higher. In addition, since it is mixed with siloxane and silanol salt multi-molecular weight solution and squirted immediately before the orifice, it is heated and foamed at the time of squirting after passing through the orifice. Since the foamed particles to be ejected have substantially the same foamed particle size and retain the fusion property, the foamed particles are blown on the surface of the adherend such as the wall of a building or facility or the outer surface of a cooling device. Are fusion Chakunuri wear along the shape by being kicked, the thickness adjustment whether the 且吹 with time be adjusted conveniently freely can the coating formed of the inorganic foamed layer.

  Furthermore, the effect of the outside air is eliminated by providing a squirting protection cone formed at a wider angle than the squirting angle behind the orifice to be squirted. Since sufficient foaming is achieved and the heat-fusibility is sufficiently maintained and sprayed onto the adherend, an inorganic foam layer is formed by strong melt-coating, and the foam particles that have been ejected are also diffused. Therefore, it can be efficiently and accurately applied to the surface to be adhered.

  In the following, the embodiment of the present invention will be described with reference to the drawings. FIG. 1 is an explanatory diagram of the mixing principle, FIG. 2 is a layout diagram of the present invention, and the materials used in the present invention are fireproof, nonflammable and disposable. In addition, siloxane and silanol are formed by forming a large number of foamed particles with the required particle size by heating and forming an inorganic foamed layer by fusing and applying to the adherend surface due to the fusing property associated with the heating. A salt multimolecular weight solution 1 is used.

  That is, the siloxane and silanol salt multi-molecular weight solution 1 is a so-called water glass of sodium silicate by once dissolving a silicon oxide component contained in a large amount in a natural ejected product such as coal ash and volcanic ash, which are inorganic industrial wastes, with an alkali agent. In addition, it is desirable to increase viscosity and give elasticity by increasing the molecular weight of the sodium silicate in order to generate foam accompanying water evaporation.

  Therefore, by condensing silanol groups in sodium silicate, the molecular weight thereof is increased to about 4,000 to 8,000 to be used as siloxane and silanol salt multimolecular weight solution 1, and naturally the siloxane and silanol salt are used. Since the multi-molecular weight solution 1 is not suitable when heated and foamed by eruption, it is not suitable if it has a very high viscosity. Therefore, the composition ratio is 20 to 35% by weight of a solid content composed of siloxane and silanol salt and 65 to 80% of water. A weight percent is used.

Since the siloxane and silanol salt multi-molecular weight solution 1 thus formed has a foamed structure as the water evaporates in its composition, it is foamed by heating at least at 100 ° C. and the foaming ratio is about 50 at most. It expands to double.
On the other hand, the inorganic foam layer used for practical use varies depending on the purpose of use, but the compression strength is required to be at least about 3 kg / cm ^{2 to} about 30 kg / cm ² or more, so the foaming ratio is at most 6 to 6 It is desirable to limit to about 30 times.

For this purpose, heat foaming is performed at a high temperature in a short time, and the desired surface is bonded to the surface to be adhered with its heat-fusibility and the desired expansion resistance is controlled by the temperature drop caused by the fusion coating. The technical idea of forming a strong inorganic foam layer is used.
For this purpose, the siloxane and silanol salt multimolecular weight solution 1 is heated to at least 300 ° C. or higher, preferably 330 to 380 ° C. and pressurized so that it can be ejected from the pore diameter of the orifice 2 into a large number of mist droplets. The compressed air 3 is mixed immediately before the orifice 2 and is then sprayed in the form of mist droplets from the orifice 2 to form foamed particles 4 by heating and foaming.

In such a case, the pressure of the heated and pressurized air 3 varies depending on the viscosity of the siloxane and silanol salt polymolecular weight solution 1 and the pore diameter and the amount of squirting of the orifice 2, but at least the foamed particles 4 squirted and heated and foamed at the orifice 2. In order to efficiently and accurately apply the coating material, the desired inorganic foamed layer 5 is formed by spraying the coating surface 5A from a distance of about 0.5 to 1.0 m and applying the coating material. As necessary, the air pressure is required to be at least 1.5 kg / cm ² or more, preferably 3.0 to 5.0 kg / cm ^2. Naturally, the heated and pressurized air 3 is controlled by the control valve 32C. Adjust as appropriate.

In order to mix the siloxane and silanol salt multi-molecular weight solution 1 with the heated pressurized air 3, the so-called suction force generated by circulating the heated pressurized air 3 through the orifice 2 from the tip of the heated air pipe 3A at a high speed is so-called. In order to achieve this, the siloxane and silanol salt multi-molecular weight solution 1 stored in the required volume of the hopper 1A is inductively supplied through the supply pipe 32F immediately before the orifice 2 where the suction force acts. It ’s fine.
In such a case, it should be noted that when the siloxane and silanol salt multimolecular weight solution 1 is supplied by induction, the siloxane and silanol salt multimolecular weight is maintained at the temperature of the heated and pressurized air 3 until it is sucked and mixed with the heated and pressurized air 3. In order to prevent the solution 1 from being heated to 100 ° C. or higher at the maximum, a heat insulating means is appropriately provided in the heated air blowing pipe 3A.

  The foamed particle diameter of the foamed particles 4 mixed with the heated and pressurized air 3 and heated and foamed while being squirted from the orifice 2 is specifically determined by the hole diameter of the orifice 2, the squirting pressure and the heating temperature and time required for heating and foaming. Therefore, in order to form the inorganic foamed layer 5 having a strong compressive strength, the foamed particles 4 having a low foaming ratio and a small foamed particle size are formed by fusion-coating with high fusing properties. On the other hand, the formation of the inorganic foamed layer 5 which is inexpensive and exhibits high heat insulation involves fusion-coating the foamed grains 4 having a high foaming ratio and a large foamed particle diameter.

In such a case, the particle diameter of the foamed particles 4 for forming the inorganic foamed layer 5 having a high compressive strength is about 0.5 to 2.0 mm for general use purposes, and is more inexpensive and highly heat-insulating. When it is desired to be approximately 3.0 to 8.0 mm, it is convenient.
As a result, it is only necessary to heat and foam about 6 to 15 times at a low expansion ratio and about 15 to 30 times at a high expansion ratio. Accordingly, when foamed particles 4 having a low foaming ratio and a foamed particle size of about 0.5 to 2.0 mm are foamed at a heating foaming ratio of 6 times, the siloxane and silanol salt multimolecular weight solution 1 is affected by eruption. The droplet diameter of the mist is about 0.14 to 0.55 mm, and the foamed particle size is about 3.0 to 8.0 mm. What is necessary is just to make it scatter by about.

By the way, the siloxane and silanol salt multi-molecular weight solution 1 foams by heating at 100 ° C. or higher and foams up to about 50 times under sufficient heating conditions. It is considered that a suitable temperature range is 300 to 550 ° C. for heating and foaming at a temperature of at least 200 ° C. or more, particularly in order to maintain heat-fusibility.
However, when the inorganic foamed layer 5 in the present invention is sprayed through the orifice 2, heated and foamed and fusion-coated, the foaming ratio is about 6 to 15 times in the case of the inorganic foamed layer 5 having high compression strength. Even at a high expansion ratio that requires a high degree of heat insulation, it is about 15 to 30 times. Accordingly, it is desired that the foamed foam 4 heated and foamed immediately be applied to the adherend surface 5A to lower the temperature and suppress excessive foaming, and if the temperature is too high, the danger of working and the adherend surface 5A are desired. Depending on the material, there is a risk of causing thermal deterioration and thermal damage, so a temperature of about 330 to 380 ° C. should be used.

Thus, the foamed particles 4 mixed with the heated and pressurized air 3 and sprayed from the orifice 2 and heated and foamed to the required foaming ratio to create the heat fusion property are applied to the required adherend surface 5A. Is applied to the adherend surface 5A due to its heat-fusibility, and the temperature of the foamed particles 4 is rapidly lowered by the fusion-coating, thereby suppressing the expansion ratio and fixing. The inorganic foam layer 5 is formed.
In such a case, since the wall surface of the building or facility, etc. or the outer surface of the cooling / heating device has a vast area from a relatively small area and has a variety of fusion coating thicknesses when the adhesion surface 5A is fusion-coated, Construction means for fusion coating that can cope with these is required.

  For this purpose, as shown in FIG. 3, a heating blower 30 that can be heated to a required heating temperature and can heat and blow the heated pressurized air 3 with a required blowing pressure is prepared in advance. Is provided with a heat transfer pipe 31 that can appropriately transfer the heated and pressurized air 3 to the construction work position, and on the other hand, the holding part 32B having a connecting part 32A that can be connected to the heat transfer pipe 31 has a heated and pressurized air. A hopper 32E capable of storing the siloxane and silanol salt multi-molecular weight solution 1 with an appropriate capacity is provided at the upper portion of the gripping portion 32B. And a squirting tool 32 configured to be mixed by the suction force of the heated and pressurized air 3 immediately before the orifice 2 provided at the other end of the gripping part 32B through the supply pipe 32F. , It is proposed to spray fusing coating wear adherend 5A.

  Further, FIG. 4 is an explanatory view of the eruption cone 6. In the construction on the surface 5A to be attached outdoors such as a wall surface of a building or facility to which the inorganic foam layer 5 is fusion-coated according to the present invention or the outer surface of a cooling / heating device. The danger that the foamed particles 4 squirted and heated and foamed at the time of fusion coating is affected by the outside air temperature and the heat fusion property is impaired, and a strong fusion coating on the adherend surface 5A cannot be performed, The foamed particles 4 are easily affected by the wind, which prevents efficient and accurate spraying on the adherend surface 5A, resulting in a problem that the fusion coating is not satisfactorily performed.

  Therefore, the siloxane and silanol salt polymolecular weight solution 1 squirted from the orifice 2 is sprayed into a squirting cone 6 formed at a wider angle than the squirting angle from the orifice 2, thereby heating and foaming foamed particles. Since 4 is not directly exposed to the outside air, it is sprayed onto the adherend surface 5A while maintaining the heat-fusibility, and the melt-coating is performed. Without spraying, the sprayed surface 5A is accurately sprayed, and the fused foam is efficiently applied to form the inorganic foamed layer 5.

In the following, an example of fusion coating of the inorganic foamed layer 5 according to the present invention will be described. Heated and pressurized air 3 heated to 350 ° C. by a heated blower 30 and heated and pressurized to a blowing pressure of 3 kg / cm ² In a building at 20 ° C. in a windless state, a siloxane and silanol salt multi-molecular weight solution 1 was mixed with heated pressurized air 3 at a rate of 2.4 ml / second using a squirting tool 32 having a orifice diameter of 1.0 mm. It was sprayed and heated and foamed to a foaming ratio of about 30 times and a foamed particle size of 6.0 mm, and sprayed onto the surface of the adherend 5A made of a plywood plate from a distance of 1.5 m from the orifice 2, and the thickness was 20 mm. When the inorganic foamed layer 5 is fusion-coated, the fusion-coating workability can be formed in about 4 minutes per 1 m ² .

  It is explanatory drawing of a mixing principle.   It is a layout diagram of the present invention.   It is explanatory drawing of a scatter tool.   It is explanatory drawing of an ejection cone.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Polysiloxane and silanol salt molecular weight solution 2 Orifice 3 Heating pressurization air 3A Heating air blower 30 Heating air blower 31 Heating transfer pipe 32 Ejection tool 32A Connection part 32B Grasping part 32C Control valve 32D Knob 32E Hopper 32F Supply pipe 4 Foamed grain 5 Inorganic foam layer 5A adherend 6 eruption holding cone

Claims (2)

  A siloxane and silanol salt multi-molecular weight solution consisting of siloxane and silanol salt, having a solid content of 20 to 35% by weight, moisture of 65 to 80% by weight and a molecular weight of 4,000 to 8,000 is heated to at least 300 ° C or higher. Then, it is mixed with pressurized pressurized air and sprayed from the orifice of the required pore size, heated and foamed to the required particle size, and by the heat-fusibility, the coated surface is fused and applied. A method for forming an inorganic foam layer, wherein the inorganic foam layer is formed to a required thickness.   The siloxane and silanol salt multi-molecular weight solution sprayed from the orifice is sprayed into a spray protection cone formed at a wider angle than the spray angle to maintain a sufficient heat foaming and heat fusion property. The method for forming an inorganic foam layer according to claim 1, wherein the fusion coating is performed with fusion coating and high workability.

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