KR101906045B1 - nonflammable heat insulator using expandable insulation material - Google Patents

Abstract

The present invention relates to a non-flammable heat insulating material using a foamed organic insulation material, which has an excellent heat insulating performance of an organic insulating material and simultaneously secures incombustibility of an inorganic insulating material. More specifically, the present invention relates to the non-flammable heat insulating material, which is obtained by foaming or pulverizing a foamed insulating material; surface-treating the foamed insulating material with a silane compound to enhance the bonding properties with an inorganic binder or an inorganic material; mixing an organic binder or an inorganic binder, an organic fiber or an inorganic fiber, or a mixed fiber of an organic fiber and an inorganic fiber, and an inorganic reinforcing agent; molding the mixture with a press; and drying a molded article, thereby having a low density and a low thermal conductivity compared to existing inorganic insulation materials.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a nonflammable heat insulator using an expandable insulation material,

The present invention relates to a fire-retardant insulating material using an organic foam insulating material having both excellent insulation performance of an organic insulating material and ensuring nonflammability of an inorganic insulating material. More specifically, the present invention relates to a fireproof insulating material that foam, An inorganic binder, an organic fiber or an inorganic fiber, or a mixed fiber of an organic fiber and an inorganic fiber, an inorganic reinforcing agent, and an opacifying agent are mixed, and after the surface treatment with a silane compound to increase the bonding property with a binder or an inorganic reinforcing agent, And has a low density and a low thermal conductivity compared to conventional inorganic insulating materials.

Polyurethane foam and expanded polystyrene, which are widely used as insulation materials for construction, are excellent in heat insulation. However, they are vulnerable to fire and lead to large-scale fire accidents. As a result, fire retardant expanded polystyrene or polyisocyanurate foam , Melamine foam, and phenol foam. However, since harmful gas is generated in the event of a fire and most of the casualties are caused by harmful gas, a fundamental solution is needed.

 Insulation materials such as perlite, vermiculite, and diatomaceous earth, which are ceramic insulation materials, have excellent nonflammability, but their thermal conductivity is relatively higher than that of organic foamed foam insulation, so that they are insufficient in thermal insulation for application to buildings. Glasses Inorganic fibers such as wool or mineral wool have excellent flame retardancy, but the flame retardancy of the binder used for the surface treatment and shaping of the fiber is poor, so it is difficult to secure fireproof performance and the thermal conductivity is about 0.033 W / mK at 20 , There arises a problem that the insulation thickness is increased compared to polyurethane foam when applied to buildings. In addition, the glass fiber is vulnerable to moisture, which causes problems such as settlement of the product and reduction of thermal insulation due to use for a long time.

 The synthetic silica insulator in inorganic insulator has a thermal conductivity of about 0.025 W / mK or less at 20, which is equal to or better than that of organic foam foam insulator. However, the conventional synthetic silica insulator has a synthetic silica (10) (20N / ㎠) and compressive strength (20N / ㎠ or more) required for building insulation, it is necessary to compress it at a high density. At this time, the strength The density of insulation is required to be more than 220Kg / ㎥ in order to satisfy the requirement. The density of conventional polyurethane foam or phenol foam is 40 ~ 60Kg / ㎥, but the use of excessive material due to high density and molding time in compression molding is high. High manufacturing costs, and even considering that synthetic silica insulation is nonflammable, it can not be used as a thermal insulation material for construction due to high material cost. Do.

 Thus, the organic foamed foam obtained by crushing or expanded in the form of particles is surface-coated with a silane compound to improve the bonding property with the inorganic substance, and then mixed with an inorganic reinforcing agent such as synthetic silica and expanded peroxide, an organic binder or an inorganic binder, And a compression molding is carried out to obtain a low-density, low-thermal-conductivity nonflammable heat insulating material having a volume secured by a foamed foam and being nonflammable by an inorganic heat insulating material.

It is an object of the present invention to provide a non-combustible high-performance heat insulating material having flame-retardant performance, heat insulating efficiency equal to or higher than that of polyurethane, and low density compared to existing synthetic silica thermal insulating materials.

In order to attain the above object, the present invention provides a method for producing a foamed insulating material, which comprises mixing a foamable insulating material coated with a silane compound, reinforcing fibers, an inorganic reinforcement, a binder and an opacifying agent, the silane compound being contained in an amount of 0.1 to 30 wt% Are mixed and formed.

10 to 99% by weight of the foam insulating material coated with the silane compound, 0.5 to 20% by weight of the reinforcing fiber, 0.1 to 60% by weight of the inorganic reinforcing material, 0.1 to 40% by weight of the binder, By weight, and the opacifying agent is mixed in an amount of 0.1 to 30% by weight.

The foamable heat insulating material is characterized in that the foamed foam is expanded in the form of particles in a liquid state.

The foamed foam may be at least one selected from phenol foam, urethane foam, polyethylene foam, polypropylene foam, and melamine foam.

The silane compound may be at least one selected from the group consisting of iso-octyltrimethoxysilane, methyltrimethoxysilane, epoxycyclohexylethyltrimethoxy silane, octyltriethoxysilane, 3- 3-aminopropyltriethoxysilane, 3-glycidyloxytriethoxysilane, 3-methacryloxypropyltrimethoxysilane, vinyltriethoxysilane, vinyltriethoxysilane, (vinyltriethoxysilane), vinyltrimethoxysilane, vinyltri (2-methoxy-ethoxy) silane, chloropropyltriethoxysilane, aminopropyltriethoxysilane, And at least one of aminopropyl trimethoxysilane.

In addition, the reinforcing fiber is an organic fiber or an inorganic fiber.

The organic fibers may be at least one of polypropylene fibers, polyethylene fibers and polyester fibers, and the inorganic fibers may be at least one of glass fibers, ceramic fibers, mineral fibers, zirconia fibers, alumina fibers or basalt fibers do.

Further, the inorganic reinforcement is characterized by being synthetic silica or expanded perlite.

The synthetic silica is a spherical amorphous particle having a specific surface area of 50 to 400 m < 2 > / g, and has a unit particle size of 10 to 100 nm and an aggregate particle size of 1 to 100 mu m.

Further, the expanded perlite is characterized in that at least one of perlite, obsidian, plowing rock, pumice is expanded after drying.

The expanded perlite has a bulk specific gravity of 20 to 40 g / l, and the expanded perlite particles contain 15 to 10% by weight of particles exceeding 400 탆, 40 to 15% by weight of particles of 400 to 250 탆 based on the total weight of the expanded peroxide, 20 to 10% by weight of particles of 250 to 160 mu m and 30 to 15% by weight of particles of less than 160 mu m.

Further, the binder is an organic binder or an inorganic binder.

The organic binder may be at least one selected from the group consisting of a liquid resol phenol resin, an epoxy resin, a silicone resin, a urethane resin, an acrylic resin, a urea resin, a powdered novolak phenol resin, a powdered melamine resin, .

The inorganic binder may be at least one of sodium silicate, potassium silicate, lithium silicate, and colloidal silica.

The opacifying agent is characterized by being at least one of silicon carbide, graphite, zirconia, zircon, aluminum oxide, and titanium dioxide.

The fire-proof insulation material using the foamable insulation material has the same heat insulation performance as that of the existing organic insulation material, but has a nonflammable property and can be manufactured at a low density and a low material cost, so that it can be used for construction and fire doors.

Fig. 1 is a schematic view showing the structure and the shape of a conventional synthetic silica thermal insulator.
Fig. 2 is a view schematically showing the construction and form of the heat insulating material containing the foamable insulating material of the present invention.

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

 The present invention is characterized by mixing particles of a foam insulating material (30) coated with a silane compound, an inorganic reinforcing agent, a reinforcing fiber, an opacifying agent and a binder as shown in Fig. (30) particles of a low density, a diaphragm is formed of an inorganic reinforcing agent, and a foamed insulating material (30) particles and an inorganic reinforcing agent are combined with a binder to obtain an excellent thermal insulation even at a density as low as about 100 to 150 Kg / It is possible to produce a fire-retardant insulating material having a high performance.

 In order to accomplish this, the foaming insulating material is a polyurethane foam, a polyethylene foam, a polypropylene foam, a melamine foam, a phenol foam, and the like. The foam may be prepared by pulverizing the foam to form particles, Expands in the form of particles in the liquid phase.

 The foamable insulating material thus prepared is an organic material and has insufficient bonding force with the binder and the inorganic reinforcing agent. To solve this problem, the surface of the foam insulating material is coated with a silane compound and dried, thereby improving the bonding property between the organic material and the inorganic material.

 In the present invention, the silane compound can improve the bonding force between an organic material and an inorganic material, and is composed of a hydrophobic silane compound, a hydrophilic silane compound, or a combination thereof.

 The silane compound may be at least one selected from the group consisting of i-octyltrimethoxysilane, methyltrimethoxysilane, epoxycyclohexylethyltrimethoxysilane, octyl triethoxysilane, 3-amino 3-aminopropyltriethoxysilane, 3-glycidyloxytriethoxysilane, 3-methacryloxypropyltrimethoxysilane, vinyltriethoxysilane, and 3-methacryloxypropyltrimethoxysilane. (vinyltriethoxysilane), vinyltrimethoxysilane, vinyltri (2-methoxy-ethoxy) silane, chloropropyltriethoxysilane, aminopropyltriethoxysilane, Aminopropyl trimethoxysilane, and the like can be used.

 The silane compound may be mixed in an amount of 0.1 to 30% by weight, preferably 0.5 to 15% by weight based on the total weight% of the foamable insulating material. If the amount is less than 0.1% by weight, If it exceeds, the increase of the bonding force can be expected, but the thermal conductivity of the foam insulating material increases.

The foamable insulating material coated with the silane compound may be mixed in an amount of 10 to 99% by weight, preferably 20 to 50% by weight, based on the total weight% of the fireproof insulation material of the present invention. If it is less than 10% by weight, it is difficult to reinforce the flexural strength and the compressive strength according to the substitution of volume, and when it is more than 99% by weight, it is difficult to secure the incombustibility.

 The reinforcing fiber of the present invention is used for reinforcing the formability, bending strength, and workability of the heat insulating material, and reinforcing fibers having a length of 3 to 30 mm are used. The reinforcing fiber may be organic fibers, inorganic fibers, or hybrid fibers of organic fibers and inorganic fibers.

 The inorganic fibers may be at least one selected from among glass fiber, ceramic fiber, mineral fiber, zirconia fiber, alumina fiber, or basalt fiber, at least one of polypropylene fiber, polyethylene fiber, polyester fiber and nylon fiber. .

The reinforcing fiber may be mixed with 0.5 to 20% by weight, preferably 0.5 to 10% by weight, based on the total weight% of the fireproof insulation material of the present invention. When the reinforcing fiber is less than 0.5% by weight, If it exceeds 20% by weight, it is difficult to ensure uniform dispersibility due to the aggregation of fibers, and the thermal conductivity is increased.

 The inorganic reinforcing agent of the present invention is used for ensuring the nonflammability of the heat insulating material and for reinforcing the heat insulating property. As the inorganic reinforcing agent, synthetic silica and expanded perlite can be used.

 Synthetic silica is a spherical amorphous silicon compound having a specific surface area of 50 to 400 m < 2 > / g. Particle size is 10-100 nm, and aggregate particles are in the range of 1-100 mu m.

 Expansion perlite is manufactured by drying perlite ore and expanding it. Perlite ore is at least one selected from perlite, obsidian, buried rock and pumice. The expanded perlite has a bulk specific gravity of 20 to 40 g / l and the expanded perlite particles have a specific gravity of 15 ± 10% by weight, particles of 400 to 250 μm, 40 ± 15% by weight, An expanded parate composed of a particle size distribution of 20 占 10% by weight of 160 占 퐉 particles and 30 占 15% by weight of particles of less than 160 占 퐉 can be used.

 The inorganic reinforcing agent may be blended in an amount of 0.1 to 60% by weight, preferably 5 to 60% by weight based on the total weight% of the fireproof thermal insulation material of the present invention. When the inorganic reinforcing agent is less than 0.1% by weight, There is a problem that the density of the heat insulating material to satisfy the bending strength and the compressive strength is increased.

  The binder of the present invention is used for reinforcing the moldability, bending strength and incombustibility of the heat insulating material, and organic binders or inorganic binders can be used.

 The organic binder may be at least one selected from the group consisting of a liquid resol phenol resin, an epoxy resin, a silicone resin, a urethane resin, an acrylic resin, a urea resin or a powdery novolak phenol resin, a powdered melamine resin, The inorganic binder may be at least one selected from the group consisting of sodium silicate, potassium silicate, lithium silicate and colloidal silica.

 The binder may be blended in an amount of 0.1 to 40% by weight, preferably 0.1 to 30% by weight based on the total weight% of the fire-proofing material of the present invention. When the binder is less than 0.1% by weight, The bending strength and the compressive strength of the heat insulating material increase but the thermal conductivity increases.

 In the present invention, the opacifying agent scatters radiant heat generated at a high temperature to block radiant heat, and at least one of silicon carbide, graphite, zirconia, zircon, aluminum oxide, and titanium dioxide can be used.

 The opacifying agent may be used in an amount of 0.1 to 30% by weight, preferably 0.1 to 25% by weight based on the total weight% of the fire retardant insulation material of the present invention. When the amount is less than 0.1% by weight, The role of blocking radiant heat at high temperature is increased, but there is a problem that the thermal conductivity rises at room temperature.

 Hereinafter, the present invention will be described in detail based on examples and comparative examples, but the present invention is not limited by examples or comparative examples.

Example  And Comparative Example

 The surface treatment contents of the silane compounds as shown in the following Tables 1 and 2 were mixed and compression-molded on the basis of the content of each component and dried to prepare a heat insulating material using a foam insulating material.

Property measurement

 The physical properties of the heat insulating material using the foamable insulating material prepared according to Examples 1 to 5 and Comparative Examples 1 to 4 were measured by the following methods, and the results are shown in Table 1 and Table 2, respectively.

[How to measure]

1. Density

The density was measured according to KS M 3808 and calculated using the following formula.

Density (Kg / m 3) = W (dry weight) / V (volume)

 2. Bending strength (flexural strength)

The bending strength was measured according to KS M 3808 and calculated by the following equation.

Bending strength (N / cm2) = 3Wl / 2bh2

 W: Maximum load (N)

 l: Distance between points (cm)

 b: Test piece width (cm)

 h: Specimen thickness (cm)

 3. Compressive strength

The bending strength was measured in accordance with KS M 3808 and calculated based on the generated loads up to 15% deformation.

Compressive strength (N / cm2) = W / A

 W: Maximum load (N)

 A: Cross-sectional area (㎠)

 4. Thermal conductivity

 The thermal conductivity test was carried out under the condition of temperature 20 measured according to KS L 9016.

 5. Flame Retardant Performance

 The flame retardant performance was measured in accordance with KS F ISO 1182 (Nonflammability test method of building materials) and KS F 2271 (Gas hazard test) based on the flame retardant performance standard of the interior finishing materials of the building (Ministry of Construction and Transportation Notice No. 2006-476) .

division Example 1 Example 2 Example 3 Example 4 Example 5 Silane compound
(Based on the total weight% of foamable insulating material) 0.5 0.5 5 5 5 Composition component
(weight%) Foam insulation material 50 50 50 30 20 Reinforcing fiber 5 5 5 5 5 Inorganic reinforcing agent 37 27 27 47 47 bookbinder 0 10 10 10 20 Opacifier 8 8 8 8 8 Properties Density (Kg / m3) 130 130 130 150 150 Bending strength (N / cm2) 20 21 25 21 26 Compressive strength (N / cm2) 21 22 23 23 26 Thermal conductivity (W / mK) 0.021 0.023 0.023 0.022 0.025 Flame retardant performance Non-combustible material Non-combustible material Non-combustible material Non-combustible material Non-combustible material

division Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 Silane compound
(Based on the total weight% of foamable insulating material) 0 0 0 0 Composition component
(weight%) Foam insulation material 50 50 30 20 Reinforcing fiber 5 5 5 5 Inorganic reinforcing agent 37 27 47 47 bookbinder 0 10 10 20 Opacifier 8 8 8 8 Properties Density (Kg / m3) 130 130 150 150 Bending strength (N / cm2) 9 11 12 16 Compressive strength (N / cm2) 13 14 18 20 Thermal conductivity (W / mK) 0.021 0.023 0.022 0.024 Flame retardant performance Non-combustible material Non-combustible material Non-combustible material Non-combustible material

As shown in Tables 1 and 2, the coating amount of the silane compound and the thermal insulating material for each component were prepared.

 The above Examples 1 to 5 secured fire-retardant performance according to the preferable composition of the foam insulating material and the inorganic reinforcing agent.

 Comparing Examples 1 and 2 and Comparative Examples 1 and 2, there is a difference in bending strength and compressive strength depending on whether silane compound coating is applied to the foam insulating material. This is because coating with the silane compound causes the foam insulating material and the inorganic The bonding property with the reinforcing agent and the binder is greatly increased.

 Comparing Example 2 and Examples 3 to 5, it is possible to determine the degree of increase in bond strength according to the coating amount of the silane compound, and it is possible to determine the tendency of the thermal conductivity, the bending strength, and the compressive strength to vary depending on the use amount.

 Comparing 4 and 5 according to the use amount of inorganic binder, the bending strength and compressive strength increase greatly according to the amount of binder used, but the heat conductivity tends to decrease due to the increase of thermal conductivity. This indicates that the insulation can be selectively used depending on the environment in which the insulation is used and the required insulation efficiency.

 As a result, the foamed insulating material surface-treated with the silane compound, the inorganic reinforcing agent, and the insulating material produced by the binder were able to secure the excellent physical strength and low thermal conductivity non-flammability even at low density.

 While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, It can be understood that the present invention can be modified within the scope of the present invention.

10: Synthetic silica
20: opacifier
30: Foam insulation material

Claims (15)

Wherein the foamed insulating material coated with the silane compound, the reinforcing fiber, the inorganic reinforcing material, the binder and the opacifying agent are mixed and the silane compound is mixed with 0.5 to 5 wt% based on the total weight% of the foamable insulating material, Wherein the foamed insulating material is used as a fire-retardant insulating material. The method according to claim 1, wherein the foaming insulating material coated with the silane compound is 10 to 99 wt%, the reinforcing fiber is 0.5 to 20 wt%, the inorganic reinforcement is 0.1 to 60 wt%, the binder is 0.1 By weight to 40% by weight, and the opacifying agent is mixed in an amount of 0.1 to 30% by weight. The fire-resistant insulating material according to any one of claims 1 to 3, wherein the foamed insulating material is a foamed foam which is expanded in the form of particles in a liquid state.  [4] The fire-extinguishing material according to claim 3, wherein the foamed foam is at least one selected from phenol foam, urethane foam, polyethylene foam, polypropylene foam and melamine foam. The method according to claim 1 or 2, wherein the silane compound is at least one selected from the group consisting of i-octyltrimethoxysilane, methyltrimethoxysilane, epoxycyclohexylethyltrimethoxysilane, octyltrimethoxysilane, 3-aminopropyltriethoxysilane, 3-glycidyloxytriethoxysilane, 3-methacryloxypropyltrimethoxysilane (3-aminopropyltriethoxysilane), 3- methacryloxypropyltrimethoxysilane, vinyltriethoxysilane, vinyltrimethoxysilane, vinyltri (2-methoxy-ethoxy) silane, chloropropyltriethoxysilane (Chloro propyltriethoxysilane), and aminopropyl trimethoxysilane. The foamed insulation material of the present invention, insulator. The fire-retardant insulating material according to any one of claims 1 to 3, wherein the reinforcing fiber is an organic fiber or an inorganic fiber. [7] The method according to claim 6, wherein the organic fiber is at least one of polypropylene fiber, polyethylene fiber and polyester fiber, and the inorganic fiber is at least one of glass fiber, ceramic fiber, mineral fiber, zirconia fiber, alumina fiber or basalt fiber Wherein the foamed insulation material is a foamed insulation material. 3. The fire-retardant insulating material according to claim 1 or 2, wherein the inorganic reinforcing material is synthetic silica or expanded perlite. 9. The foamed insulating material according to claim 8, wherein the synthetic silica is spherical amorphous particles having a specific surface area of 50 to 400 m < 2 > / g, wherein the unit particles are 10 to 100 nm and the aggregate particles are 1 to 100 m. . 9. The fire-retardant insulation material according to claim 8, wherein the expanded perlite is at least one of perlite, obsidian, sandstone, and pumice is expanded after being dried. 9. The method of claim 8, wherein the expanded perlite has a bulk specific gravity of 20 to 40 g / l, wherein the expanded perlite particles comprise 15 + 10% Wherein the particle size distribution is ± 15% by weight, the particle size is 250 ± 160 μm, the particle size is 20 ± 10% by weight, and the particle size smaller than 160 μm is 30 ± 15% by weight. The fire-retardant insulating material according to any one of claims 1 to 3, wherein the binder is an organic binder or an inorganic binder. The organic binder according to claim 12, wherein the organic binder is selected from the group consisting of liquid resol phenol resin, epoxy resin, silicone resin, urethane resin, acrylic resin, urea resin, powdered novolak phenol resin, powdered melamine resin, epoxy resin, Of the total amount of the foamed insulation material. 13. The fire-resistant insulating material according to claim 12, wherein the inorganic binder is one or more of sodium silicate, potassium silicate, lithium silicate, and colloidal silica. The fire-resistant insulating material according to claim 1 or 2, wherein the opacifying agent is at least one of silicon carbide, graphite, zirconia, zircon, aluminum oxide, and titanium dioxide.

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