TWM643868U - Cryogenic insulation member - Google Patents

Abstract

A low-temperature heat-insulation piece is used to solve the problems that the conventional low-temperature heat-insulation piece material is easily deteriorated and easily affected by external mechanical shock or vibration. The invention comprises: a matrix with an inner surface and an outer surface, the matrix is prepared from a copolymer, the copolymer contains polyethylene and polypropylene units, the closed cell content of the matrix is greater than 95%, and the density is 30-70 kg/m ³ ; and at least one additional layer is located on the outer surface of the matrix.

Description

Cryogenic insulation

The invention relates to a thermal insulation piece, especially a low-temperature thermal insulation piece capable of fire prevention and pipeline corrosion prevention.

Known low-temperature insulation parts are made of inorganic materials such as rock wool, glass fiber, and foam glass. However, the water vapor transmission rate (WVTR) of these materials is too high, which makes installation difficult and the material is easy to deteriorate. Therefore, condensation polymer plastics with low thermal conductivity and low fragility (such as polyurethane and polyisocyanurate) are used to manufacture low-temperature insulation parts. However, the low-temperature insulation material system made of condensation polymer plastics requires at least one layer of vapor barrier, which makes the low-temperature insulation parts very sensitive to external mechanical shock or vibration, and the fire resistance of such low-temperature insulation parts is not good, and pipeline corrosion is also prone to occur after long-term use.

In view of this, there is still a need to improve the known low-temperature heat insulating parts.

In order to solve the above-mentioned problems, the purpose of this creation is to provide a low-temperature heat insulating piece, which can maintain a certain degree of flexibility at low temperatures so as to absorb shocks or shocks.

The second purpose of this creation is to provide a low-temperature heat insulation piece, which can reduce installation difficulty and maintenance cost.

Another purpose of this invention is to provide a low-temperature thermal insulation element that can improve fire resistance and reduce corrosion.

Directions or similar terms mentioned in the full text of this creation, such as "front", "back", "left", "right", "top (top)", "bottom (bottom)", "inside", "outside", "side", etc., mainly refer to the directions of the attached drawings. Each direction or similar terms are only used to assist in explaining and understanding the various embodiments of this creation, and are not intended to limit this creation.

The use of "a" or "one" as a quantifier for the elements and components described throughout this creation is only for convenience and to provide the usual meaning of the scope of this creation; in this creation, it should be interpreted as including one or at least one, and a single concept also includes plural situations, unless it clearly means otherwise.

Approximate terms such as "combination", "combination" or "assembly" mentioned in the full text of this work mainly include the separation without destroying the components after connection, or the inseparability of components after connection, etc. Those with ordinary knowledge in the field can choose according to the materials of the components to be connected or assembly requirements.

The low-temperature thermal insulation element of the present invention comprises: at least one substrate with an inner surface and an outer surface, the substrate is prepared from a copolymer, the copolymer contains polyethylene and polypropylene units, the closed cell content of the substrate is greater than 95%, and the density is 10-100 kg/m ³ ; and at least one additional layer is located on the outer surface of the substrate.

Accordingly, the low-temperature thermal insulation of the present invention has amorphous properties, which can improve the flexibility of the low-temperature thermal insulation at low temperatures, and has the effect of reducing the difficulty of manufacturing and installing the low-temperature thermal insulation and the maintenance cost of the low-temperature thermal insulation. The low-temperature thermal insulation is made of neutral hydrophobic materials, which can reduce the risk of corrosion and water vapor transmission rate; moreover, the low-temperature thermal insulation does not require an additional waterproof layer, and can absorb external mechanical shock and/or vibration harshness. Non-fragile effect; in addition, by adding flame retardants and flame retardants in the manufacturing process, it has the effect of improving the fire resistance of the low-temperature thermal insulation.

Wherein, the copolymer is ethylene-propylene-diene rubber (EDPM). In this way, it has the effect of improving the flexibility at low temperature and the heat resistance at high temperature of the low temperature heat insulating element.

Wherein, the additional layer is an expanded polymer. In this way, it has the effect of improving the flexibility of the additional layer at low temperature.

Wherein, the thermal conductivity of the matrix is less than 0.04 W/mK. In this way, it has the effect of improving the thermal insulation performance of the low-temperature thermal insulation element.

Wherein, the additional layer is an expanded elastomer, the closed cell content of the additional layer is greater than 95%, the density is 40-200 kg/m ³ , and the thermal conductivity is less than 0.04 W/mK. In this way, it has the effect of improving the heat insulation, light weight and sound insulation/vibration resistance of the additional layer.

Wherein, the flame spread index of the low-temperature thermal insulation part is less than 25, and the smoke diffusion index is less than 450. In this way, the fire resistance level of the low temperature heat insulation element can reach the ASTM E84 test grade A, which has the effect of improving the fire resistance performance of the low temperature heat insulation element.

Wherein, the concentration of free chlorine ions in the water of the low-temperature thermal insulation element is less than 90 ppm. In this way, it can reduce the generation of free chloride ions of the low-temperature heat insulation part, and has the effect of reducing pipeline corrosion.

Wherein, the linear shrinkage rate of the low-temperature thermal insulation member at 110°C and -150°C is less than 7%. In this way, it has the effect of improving the heat resistance of the low-temperature heat insulation element.

Wherein, the inner surface of the substrate has a functional layer, and the material of the functional layer is metal foil. In this way, at low temperature, the aluminum foil will shrink to form wrinkles, and the wrinkles further form a heat insulation layer, which keeps the base from low-temperature objects and has the effect of increasing the use temperature range of the base.

Wherein, the metal foil is aluminum foil. In this way, it has the effect of improving adhesion, low temperature stability and preventing wear or corrosion.

Wherein, the aluminum foil is attached to the inner surface of the base by adhesive. In this way, it has the effect of improving the bonding strength between the substrate and the aluminum foil.

In order to make the above and other purposes, features and advantages of this creation more obvious and easy to understand, the preferred embodiments of this creation are specifically cited below, and are described in detail with the accompanying drawings; in addition, those marked with the same symbols in different drawings are deemed to be the same, and their descriptions will be omitted.

Please refer to Figure 1, which is the first embodiment of the low-temperature heat-insulation element of this invention. The low-temperature heat-insulation element includes a base body 1 and an additional layer 2. The additional layer 2 is bonded to the outer surface of the base body 1. The combination of the base body 1 and the additional layer 2 can be various conventional combinations such as bonding, snap-fitting, or directly placing the additional layer 2 loosely on the outer surface of the base body 1, which is not limited in this invention. In this embodiment, the bonding method is to bond the substrate 1 and the additional layer 2 through an adhesive. The adhesive is preferably a flame-retardant organic adhesive containing chloroprene, acrylic acid, vinyl acetate and its derivatives, etc., so that the flame-spread index (FSI) of the low-temperature insulation element can be less than 25, and the smoke-developed index (Smoke-developed Index, SDI) is less than 450, thereby making the low-temperature insulation element It can achieve the function of ASTM E84 test class A fire rating.

The material of the base 1 can be an elastomer comprising polyethylene and polypropylene units, and the shape of the base 1 can be sheet, tube or other shapes, which are not limited in this invention. In this embodiment, the base body 1 is a tubular elastic body. The material of the base 1 is preferably ethylene propylene diene monomer (EDPM) elastomer, so that the concentration of free (water-leachable) chloride ions in the water tested by the ASTM C871 standard of the base 1 is less than 90 ppm. The matrix 1 has a large number of closed cells, the closed cell content is preferably greater than 95%, and the density is 10-100 kg/m ³ , preferably 20-80 kg/m ³ , more preferably 30-70 kg/m ³ . The thermal conductivity of the substrate 1 is less than 0.08 W/mK, preferably less than 0.04 W/mK. The matrix 1 may further include fillers, fibers, additives, colorants, cross-linking agents, ceramicizing agents, char-forming agents, intumescent systems, stabilizers, anti-hydrolysis agents, flame retardants and other polymers (thermoplastic/solid polymers, TPE) and other components, which are not limited in this invention. In this embodiment, the base 1 may additionally contain a flame retardant, so that the flame spread index (Flame-spread Index, FSI) of the low-temperature heat insulation element is less than 25, and the smoke-developed index (Smoke-developed Index, SDI) is less than 450, so that the low-temperature heat insulation element can achieve the effect of ASTM E84 test class A fire rating.

The material of the additional layer 2 is a porous heat insulating material, which can be an inorganic heat insulating material (for example: fiber glass, foam glass, mineral wool), a rigid organic heat insulating material (for example: PUR/PIR, polystyrene, etc.) or a flexible organic heat insulating material. , and the free (water-leachable) chloride ion concentration in water tested by ASTM C871 standard is preferably less than 90 ppm. The additional layer 2 may further include fillers, fibers, additives, colorants, crosslinking agents, ceramicizing agents, charring agents, stabilizers, antihydrolysis agents, flame retardants and other polymers (thermoplastic/solid polymers, TPE) and other components, which are not limited in this invention. In this embodiment, the additional layer 2 may additionally contain a flame retardant, so that the flame spread index (Flame-spread Index, FSI) of the low-temperature heat insulation element is less than 25, and the smoke-developed index (Smoke-developed Index, SDI) is less than 450, so that the low-temperature heat insulation element can achieve the effect of ASTM E84 test class A fire protection.

Preferably, the outer surface of the additional layer 2 may additionally have an outer layer 3 for reducing the influence of the external environment on the low-temperature heat insulation member. The outer layer 3 can be a coating containing a high-strength material (such as fiber-reinforced plastic), which is attached to the outer surface of the additional layer 2 through an adhesive, or can be a coating made of a high-strength material (such as: metal), which can be attached or loosely installed on the outer surface of the additional layer 2, which is not limited in this invention.

Please refer to Figure 2, which is the second embodiment of the low-temperature thermal insulation element of this invention. This embodiment is roughly the same as the above-mentioned first embodiment. In this embodiment, the low-temperature thermal insulation element includes several layers of substrates 1 and several layers of additional layers 2. Each of the substrates 1 and each of the additional layers 2 may have the same or different properties, such as mechanical strength, density, and opening content, which are not limited by this invention. Each of the substrates 1 can be loosely stacked on each other or bonded with an adhesive. In this embodiment, each of the substrates 1 is bonded to each other through an adhesive. The number and thickness of each of the substrate 1 and each of the additional layers 2 depends on the temperature to be insulated, and is not limited in this invention.

The low-temperature insulation element also has a functional layer 4, which is bonded to the inner surface of the base body 1 formed into a tubular elastic body. The combination of the functional layer 4 and the base body 1 can be in various conventional ways such as bonding, snap-fitting, etc., which is not limited in this invention. In this embodiment, the bonding method is to bond the substrate 1 and the functional layer 4 through an adhesive. The material of the functional layer 4 can be a metal foil, preferably an aluminum foil. At the implementation temperature of this embodiment (below -110°C), the low-temperature heat-insulating element will shrink to cause wrinkles in the functional layer, and the wrinkles will form a layer of voids, which can form a new heat-insulating layer, thereby having the effect of separating the low-temperature heat-insulating element from the low-temperature object.

Please refer to Figure 3, which is a comparison chart of thermal conductivity between the first embodiment (A) and the second embodiment (B) of the present invention and the conventional heat insulating member (S). The thickness/number of layers of the base body 1 depends on whether the outer surface of the base body 1 reaches a non-critical temperature. Please refer to Figure 3 (A), at -100°C, the outer surface temperature of a layer of 30cm thick substrate 1 is -50°C; please refer to Figure 3 (B), at -165°C, two layers of 30cm thick substrate 1 are required to achieve the same thermal insulation effect as in Figure 3 (A), and at -200°C, thicker or more layers of the substrate 1 are required. The thickness/number of layers of the additional layer 2 then depends on whether the outer surface of the additional layer 2 reaches room temperature.

To sum up, the low-temperature thermal insulation of this invention has amorphous properties, which can improve the flexibility of the low-temperature thermal insulation at low temperatures, and has the effect of reducing the difficulty of manufacturing and installation of the low-temperature thermal insulation and the maintenance cost. The low-temperature thermal insulation is made of neutral hydrophobic materials, which can reduce the risk of corrosion and water vapor transmission. In addition, the low-temperature thermal insulation does not need an additional waterproof layer, and can absorb external mechanical shock and/or vibration harshness (vibration harshness), and has high strength during use and less brittle; in addition, by adding flame retardants and flame retardants in the manufacturing process, it has the effect of improving the fire resistance of the low-temperature insulation.

Although this creation has been disclosed by using the above-mentioned preferred embodiments, it is not intended to limit this creation. Anyone who is familiar with this technology can make various changes and modifications relative to the above-mentioned embodiments without departing from the spirit and scope of this creation. It is still within the technical scope of protection of this creation. Therefore, the scope of protection of this creation should include all changes within the context and equivalent scope recorded in the appended patent application scope. In addition, when the above-mentioned several embodiments can be combined, the invention includes any combination of implementations.

﹝This creation﹞ 1: Matrix 2: Additional layers 3: outer layer 4: Functional layer M: Known cold insulation materials

[Picture 1] A side view of the structure of the first embodiment of this creation. [Fig. 2] A side view of the structure of the second embodiment of this creation. [Picture 3] Comparison of the thermal conductivity of the low-temperature insulation of the second embodiment of the invention and the conventional insulation.

1: matrix

2: Additional layers

3: outer layer

Claims (11)

A low-temperature thermal insulation element, comprising: a substrate with an inner surface and an outer surface, the substrate is prepared from a copolymer, the copolymer includes polyethylene and polypropylene units, the closed cell content of the substrate is greater than 95%, and the density is 30-70 kg/m ³ ; and at least one additional layer is located on the outer surface of the substrate. The low-temperature heat insulation element according to claim 1, wherein the copolymer is ethylene-propylene-diene rubber (EDPM). The low temperature thermal insulation element as claimed in claim 1, wherein the additional layer is an expanded polymer. The low-temperature thermal insulation element according to any one of claims 1 to 3, wherein the thermal conductivity of the matrix is less than 0.04 W/mK. The low-temperature thermal insulation element of claim 4, wherein the additional layer is an expanded elastomer with a closed cell content greater than 95%, a density of 40-200 kg/m ³ , and a thermal conductivity of less than 0.04 W/mK. The low-temperature thermal insulation element as claimed in Claim 1, wherein the flame spread index of the low-temperature thermal insulation element is less than 25, and the smoke diffusion index is less than 450. The low-temperature heat insulation element as claimed in claim 1, wherein the concentration of free chlorine ions in the water of the low-temperature heat insulation element is less than 90 ppm. The low-temperature heat insulation element as claimed in claim 1, wherein the linear shrinkage rate of the low temperature heat insulation element at 110°C and -150°C is less than 7%. The low-temperature thermal insulation element according to Claim 1, wherein the inner surface of the substrate has a functional layer, and the material of the functional layer is metal foil. The low-temperature heat insulation element according to claim 9, wherein the metal foil is aluminum foil. The low-temperature thermal insulation element as claimed in claim 10, wherein the aluminum foil is attached to the inner surface of the substrate by an adhesive.

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