KR101989686B1 - Fire retardant and resistance duct structure - Google Patents

Abstract

The present invention relates to a fire-retardant duct structure that can selectively perform room temperature and heat curing, there is no interlaminar separation phenomenon or cracking through a firm bond, and has a high flame retardancy and fire resistance, but also halogenated polyester fiber Or a corrosion resistant inner layer formed by the inner layer of the duct by impregnation with the corrosion resistant resin of any one of an inactivating resin, a polyester resin, a vinyl ester resin, and an epoxy resin, and glass fibers used in forming the corrosion resistant inner layer. Impregnated in the same resin as the resin and bonded to the outer periphery of the corrosion-resistant inner layer and formed into a middle layer of the duct, and glass fibers are impregnated with the acrylic resin to which the flame retardant is added, A fire resistant outer layer formed as an outer layer of the duct It achieved by also.

Description

FIRE RETARDANT AND RESISTANCE DUCT STRUCTURE}

The present invention relates to fire retardant duct structures having reduced heat transfer and increased fire resistance, which are useful for storing or transporting hazardous materials that present a risk of corrosion and fire.

In a variety of industrial environments, various types of vessels or ducts are used to continuously discharge transport or storage materials, and these vessels or ducts are subject to corrosion and fire, wear and corrosion, or thermal attack, depending on their use. Physical properties are required to withstand the external environment such as thermal attack.

For example, many efforts have been made to provide double wall structures using materials that can provide chemical resistance, heat resistance, abrasion resistance and fire resistance (ie, thermosetting, thermoforming, ceramic or metallic).

However, none has identified a suitable material or method to provide sufficient chemical resistance, heat resistance, abrasion resistance and fire resistance. In particular, it is more difficult to provide a solution to this problem using a single material, and there are also large differences between the same class of materials.

However, conventionally known techniques have been used to cover metal or fiber reinforced plastic (FRP). That is, in the late 1960's and early 1970's, Lawrence E. Shea proposed a suitable method of making a mist discharge duct that could be used as a smoke removal exhaust duct and that would not require the use of an internal fire sprinkler. For example, US Pat. Nos. 4,053,447, 4,076,873 and 4,107,127. In addition, the factory manual (Factory Mutual, FM) was studied to develop a specific test protocol for testing the survivability of duct piping under actual fire conditions.

That is, as shown in FIGS. 1 and 2, the maximum temperature reached at the discharge thermocouple located at 7 m during fire conditions was found to reach 1000 ° F. (approximately 538 ° C.), and thus the temperature reaching the thermocouple was tested by FM. It has become part of the standard for determining the acceptance or rejection of the protocol and is still the test standard of FM # 4922 approval for the use of fume exhaust duct piping.

Recently, a multilayer structure using a flame retardant phenolic resin is mainly used, and in Korea, there is a 'composite multilayer structure and a manufacturing method thereof' of Korean Patent Publication No. 10-1430078. The multilayer structure using such a phenolic resin is also widely used because it satisfies the conditions for FM approval described above.

However, in the case of a multilayer structure using a phenolic resin, it is impossible to cure at room temperature due to the moisture contained therein, and thus, it must be subjected to thermal curing only. Therefore, the interlayer peeling phenomenon occurs due to the difference in shrinkage between inner and outer layers during thermal curing. It is easy to occur, and in particular, there is a problem in that the mechanical strength is weak with the phenomenon of cracking due to the phenolic resin itself.

An object of the present invention devised to solve the above problems, can selectively perform the room temperature and heat curing, there is no interlaminar peeling phenomenon or cracking through a solid bond, has excellent mechanical strength but having flame retardancy and fire resistance A fire retardant duct structure is provided.

Other objects, specific advantages and novel features of the invention will become more apparent from the following detailed description and preferred embodiments in conjunction with the accompanying drawings.

In order to achieve the above object, a fire retardant duct structure according to the present invention is a duct by impregnating a polyester fiber with a corrosion resistant resin of any one of halogenated or non-halogenated resin, polyester resin, vinyl ester resin and epoxy resin. Corrosion-resistant inner layer formed of an inner layer of, and impregnated glass fiber in the same resin as the resin used in the formation of the corrosion-resistant inner layer is bonded to the outer periphery of the corrosion-resistant inner layer formed of a middle layer of the duct And, the glass fiber is impregnated with the acrylic resin to which the flame retardant is added, and comprises a fire-resistant outer layer formed on the outer periphery of the corrosion-resistant intermediate layer formed as the outer layer of the duct.

The flame retardant of the refractory outer layer is a halogen-based or non-halogen-based compound.

In addition, the halogen-based compound is characterized in that bromine (Br) is used as the halogen element.

The non-halogen compound is a phosphorus compound or an inorganic compound.

The inorganic compound may be aluminum hydroxide [Al (OH) ₃ ].

The acrylic resin of the fire resistant outer layer has a viscosity of 0.65 to 0.75 [poise] and a density of 0.95 to 1.15 [gcm ^-3 ] at room temperature, and the addition ratio of the flame retardant is 1: 1.5 to 2.0.

In addition, the fire-resistant outer layer, the glass fiber has a weight ratio of 29 to 31%, tensile strength 110-120 [MPa], tensile modulus 6.0-7.0 [GPa], elongation 2.1-2.4%, bending strength 180-180 when fully cured It is characterized by 200 [MPa] and a flexural modulus of 5.0-6.0 [GPa].

In addition, the fire-resistant outer layer takes 24 hours when fully cured at 20 ℃ conditions, 16 hours when fully cured at 40 ℃ conditions, 3 hours to 5 hours when completely cured at conditions between 80 ℃ to 120 ℃ It is characterized by the fact that it takes.

The corrosion resistant inner layer, the corrosion resistant intermediate layer, and the fire resistant outer layer each have a thickness ratio of 0.6: 1.4: 5.

Fire retardant duct structure according to the present invention, can be selectively carried out at room temperature and thermal curing, there is no interlaminar separation phenomenon or cracking through a firm bond, it is excellent in mechanical strength and has the effect of flame retardancy and fire resistance.

1 is a schematic diagram of a standard apparatus for testing horizontal ducts of FM approval,
2 is a schematic diagram of a standard device for testing horizontal / vertical mating ducts with FM approval,
3 is a perspective view of a fire retardant duct structure according to the present invention,
4 is a cross-sectional view taken along line AA ′ of the embodiment of FIG. 3.

Hereinafter, with reference to the accompanying drawings will be described in detail a preferred embodiment of the fire retardant duct structure according to the present invention.

Fire-retardant duct structure according to the present invention, as shown in Figures 3 and 4 comprises a corrosion-resistant inner layer 100, a corrosion-resistant intermediate layer 200 and a fire-resistant outer layer 300, the corrosion-resistant inner layer 100 ) Is a polyester fiber (PEF) impregnated in the corrosion-resistant resin 110 is formed as an inner layer, the corrosion-resistant intermediate layer 200 is a glass fiber (GF) is impregnated in the corrosion-resistant resin 110, the middle layer The fire resistant outer layer 300 is formed of an outer layer by impregnating the glass fiber (GF) in the acrylic resin 320 to which the flame retardant 310 is added.

The corrosion resistant inner layer 100 is impregnated with polyester fibers (PEF) in the corrosion resistant resin 110 of any one of a halogenated or non-halogenated resin, polyester resin, vinyl ester resin and epoxy resin to the inner layer of the duct 10 Is formed. Corrosion-resistant inner layer 100 is a part in contact with the chemicals that are transported or transported into the interior of the duct 10, and should have corrosion resistance and fire resistance in the event of a fire. Corrosion-resistant inner layer 100 is formed in a cylindrical or cylindrical mandrel to form a layer of the required thickness through the hand layup, filament winding or tape winding.

Corrosion-resistant intermediate layer 200 is impregnated with glass fiber (GF) in the same resin used in the formation of the corrosion-resistant inner layer 100 is bonded to the outer periphery of the corrosion-resistant inner layer 100 is the duct 10 It is formed into a middle layer. The corrosion resistant intermediate layer 200 is a structure for achieving a strong bond between the corrosion resistant inner layer 100 and the fire resistant outer layer 300 described later. That is, by using the same resin as the corrosion-resistant resin 110 used in the corrosion-resistant inner layer 100 to maximize the bonding force with the corrosion-resistant resin 110, using a glass fiber (GF) fire-resistant outer layer 300 to be described later ) Can also lead to a strong bond. Method of forming the corrosion-resistant intermediate layer 200 may be formed of a layer of the required thickness through the hand lay-up or filament winding on the outer periphery of the corrosion-resistant inner layer 100, the corrosion-resistant inner layer 100 and fire-resistant outer layer 300 and It may be formed as a middle layer using a glass fiber mat to further increase the bonding force in the relationship.

The fire resistant outer layer 300 is impregnated with a glass fiber (GF) in the acrylic resin 320 to which the flame retardant 310 is added, is bonded to the outer circumference of the corrosion resistant intermediate layer 200 is formed as an outer layer of the duct 10. . Fire-resistant outer layer 300 should be able to withstand the flame from the outside in the event of a fire should have the characteristics of maximum flame retardant and fire resistance. To this end, while using the acrylic resin 320 having a low viscosity and density so as to add the flame retardant 310 as possible, it is possible to bring a firm bonding between the layers, high tensile and bending strength to have excellent mechanical strength. The method of forming the fire resistant outer layer 300 may also be formed on the outer circumference of the corrosion resistant intermediate layer 200 through a hand layup, filament winding or tape winding to a layer having a necessary thickness, and to increase the addition rate of the flame retardant 310. The layers may be formed such that the directions of the respective glass fibers GF intersect between a plurality of layers in which the GFs are unidirectional.

In particular, while using the acrylic resin 320 in the fire-resistant outer layer (300) to find specific physical properties to meet the FM approval conditions, through the characteristic combination ratio to allow easy selection of room temperature curing or heat curing when necessary do.

The acrylic resin 320 is composed of carbon, hydrogen, and oxygen as an organic resin, and is easily burned. Therefore, the flame retardant 310 is added to the acrylic resin 320 to slow the ignition and to prevent the expansion of combustion. As the flame retardant method of the organic compound (polymer resin), there are largely four methods, namely, the molecular structure of the resin itself. Chemically bond the flame retardant component to the resin, physically add the flame retardant to the resin, and coating or painting other flame retardants. The modification of the resin's molecular structure itself is clearly limited, the chemical bonding method is very disadvantageous in terms of cost and process, and in the case of coating or painting, the durability is significantly lowered, and thus the physical addition method is mainly used.

Accordingly, a halogen-based or non-halogen-based compound may be used as the flame retardant 310 of the fire resistant outer layer 300. Halogen-based compounds exhibit flame retardant effects by capturing active radicals OH and H, which act as a driving force for combustion, by the halogen compound HX (X is a halogen element) during combustion. In addition, HX generates an incombustible gas and thus has the effect of diluting the combustible gas and blocking oxygen.

For example, when the halogen compound HX is used as the flame retardant 310, 1) the flame chain reaction through HO + HX → HOH + X (prohibited reaction), X + RH → HX + R (regeneration reaction) is stopped, and 2) Stop the flame chain reaction by reducing the concentration of active radicals (OH, H) through XO + OH → HX + O ₂ reaction, and 3) through reaction of X + O → XO, X ₂ + O → XO + X. Generates incombustible gas and functions to dilute and block O ₂ . Here, the halogen element X of the halogen compound HX is iodine (I), fluorine (F), chlorine (Cl) and bromine (Br), of which bromine (Br) is the most effective. However, since halogen gas is generated when the halogen compound performs a flame retardant function, a flame retardant synergistic effect may be obtained by using an antimony-based or phosphorus-based flame retardant rather than being used alone.

In addition, the flame retardant 310 may use a non-halogen compound, the non-halogen compound may be a phosphorus compound or an inorganic compound. Phosphorus-based compound reacts with combustible materials in the combustion process to form a carbon film on the surface of the polymer, and this carbon film has a flame retardant effect by blocking oxygen necessary for combustion. Phosphorous flame retardants include phosphate esters, halogen-containing phosphate esters, non-halogen condensed phosphorus flame retardants, polyphosphate salts, and phosphate salts.

In the case of inorganic compounds, non-halogen compounds are flame retardants that suppress the combustion gas by taking the heat of the combustion point while suppressing the combustion gas. H ₂ O is generated during combustion to change the water vapor into vapor and dilute the combustion gas. Reduce the temperature of combustion to suppress combustion. For example, inorganic compounds include magnesium hydroxide, zinc borate, molybdenum compounds, antimony trioxide, antimony pentoxide and aluminum hydroxide, among which aluminum hydroxide is most effective.

As described above, when the flame retardant 310 is used by adding the flame retardant 310 to the acrylic resin 320 used in the fire resistant outer layer 300, the acrylic resin 320 is maximized to maximize the addition ratio of the flame retardant 310. Characteristic properties are required. That is, the acrylic resin 320 of the fire resistant outer layer 300 has a viscosity of 0.65 to 0.75 [poise] and a density of 0.95 to 1.15 [gcm ^-3 ] at room temperature. The addition ratio of the flame retardant 310 to the acrylic resin 320 having such physical properties may be 1: 1.5 to 2.0. That is, even if the flame retardant 310 is added up to 1.5 times to 2 times with respect to the weight of the acrylic resin 320, the density and viscosity before the addition are low, so that the impregnation rate of the glass fiber (GF) can be maintained after the addition.

In addition, the fire-resistant outer layer 300 has a glass fiber (GF) has a weight ratio of 29 to 31%, tensile strength 110 to 120 [MPa], tensile modulus 6.0 to 7.0 [GPa], elongation 2.1 to 2.4% when fully cured It may have excellent mechanical strength of 180 to 200 [MPa] and a flexural modulus of 5.0 to 6.0 [GPa].

In this case, the refractory outer layer 300 may select room temperature curing or thermosetting, for example, it takes 24 hours when fully cured at 20 ℃ conditions, 16 hours when fully cured at 40 ℃ conditions, 80 ℃ to 120 It is characterized by 3 to 5 hours of complete curing at conditions between ℃.

Finally, the fire resistant flame retardant duct structure of the present invention is the optimal thickness ratio to pass through a specific test protocol as shown in Figures 1 and 2 for FM approval, the corrosion resistant inner layer 100, corrosion resistance Each of the intermediate layer 200 and the fire resistant outer layer 300 has a thickness ratio of 0.6: 1.4: 5. However, the error of about 0.01 to 0.03 in each thickness ratio will be ignored.

As described above, the fire resistant flame retardant duct structure according to the present invention can selectively perform room temperature and thermal curing, and there is no interlaminar peeling or cracking through solid bonding, and has excellent mechanical strength but has an effect of flame resistance and fire resistance. have.

The embodiments of the present invention described above and illustrated in the drawings should not be construed as limiting the technical idea of the present invention. The protection scope of the present invention is limited only by the matters described in the claims, and those skilled in the art can change and change the technical idea of the present invention in various forms. Therefore, such improvements and modifications will fall within the protection scope of the present invention, as will be apparent to those skilled in the art.

10: duct
GF: Glass Fiber
PEF: Polyester Fiber
100: corrosion resistant inner layer 110: corrosion resistant resin
200: corrosion resistant intermediate layer
300: fireproof outer layer
310: flame retardant 320: acrylic resin

Claims (9)

A corrosion resistant inner layer formed of an inner layer of a duct by impregnating polyester fibers with a corrosion resistant resin of any one of a halogenated or non-halogenated resin, a polyester resin, a vinyl ester resin, and an epoxy resin;
A corrosion resistant intermediate layer formed by forming a middle layer of the duct by impregnating glass fiber with the same resin as the resin used in forming the corrosion resistant inner layer, and bonded to the outer circumference of the corrosion resistant inner layer;
Impregnating the glass fiber with an acrylic resin to which a flame retardant is added, and including a fire resistant outer layer which is bonded to the outer circumference of the corrosion resistant intermediate layer and formed as an outer layer of the duct,
Acrylic resin of the fire-resistant outer layer,
It has a viscosity of 0.65 to 0.75 [poise] and a density of 0.95 to 1.15 [gcm ^-3 ] at room temperature, the flame retardant is added in a weight ratio of 1: 1.5 to 2.0,
The fire resistant outer layer,
The glass fiber has a weight ratio of 29 to 31%, and when fully cured, tensile strength 110 to 120 [MPa], tensile modulus 6.0 to 7.0 [GPa], elongation 2.1 to 2.4%, bending strength 180 to 200 [MPa], bending elastic modulus 5.0 to 6.0 [GPa],
Each of the corrosion resistant inner layer, the corrosion resistant intermediate layer, and the fire resistant outer layer,
A fire-retardant flame-retardant duct structure, characterized in that the thickness ratio is 0.6: 1.4: 5.
The method of claim 1,
The flame retardant of the fire resistant outer layer,
Refractory flame retardant duct structure, characterized in that the halogen-based or non-halogen-based compound.
The method of claim 2,
The halogen compound,
A flame retardant flame retardant duct structure using bromine (Br) as the halogen element.
The method of claim 2,
The non-halogen compound,
Fire-retardant flame-retardant duct structure, characterized in that the phosphorus compound or inorganic compound.
The method of claim 4, wherein
The inorganic compound,
Fire-resistant flame-retardant duct structure characterized in that the aluminum hydroxide [Al (OH) ₃ ].
delete delete The method of claim 1,
The fire resistant outer layer,
It takes 24 hours when fully cured at 20 ° C conditions, 16 hours when fully cured at 40 ° C conditions, 3 to 5 hours when fully cured at conditions between 80 ℃ to 120 ° C Fire Retardant Flame Retardant Duct Structure. delete

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