Thermal insulation glass fiber felt for low-temperature storage tank

Abstract

A preparation method of the thermal insulation glass fiber mat for the low-temperature storage tank comprises the following steps: 1) cutting glass fibers with the diameter of 7-9 microns into long glass fibers with the length of 140-150 mm and short glass fibers with the length of 45-50 microns; 2) fully mixing and opening long and short glass fibers; (3) mixing the opened glass fibers, and uniformly spreading the glass fibers on a feeding curtain of a carding machine; (4) carding the glass fibers fed in the step (2) into a uniform fiber net by a carding machine, (5) uniformly scattering phenolic resin powder and hollow glass beads on the fiber net, and (6) conveying the fiber net on which the powder is scattered in the step (5) to a lapping machine for lapping, and feeding the fiber net into a drying tunnel for drying and forming to obtain the thermal insulation glass fiber mat for the low-temperature storage tank.

Description

Technical Field

[0001] The invention relates to a glass fiber-based thermal insulation material, in particular to a glass fiber felt. Background Art

[0002] Glass fiber felt is a felt-like material made from glass fiber, and can be used in the fields of sound insulation, sound absorption, shock absorption, flame retardancy, filtration, etc. in the industrial field. Existing cryogenic storage tanks for storing LNG require insulation materials to be installed between the inner and outer tank walls for the purpose of insulation. Traditional glass fiber felt has the advantages of high density, low elasticity, and poor insulation effect, making it difficult to apply to the insulation field of cryogenic storage tanks such as LNG. Chinese patent document CN116005359 A discloses a glass fiber felt reinforced with phenolic resin. Although it has improved insulation performance and elasticity, it also has the problems of high density and unsatisfactory insulation performance. Therefore, providing a thermal insulation glass fiber felt suitable for cryogenic storage tanks has become an urgent problem to be solved in the prior art. Summary of the invention

[0003] In order to solve the above-mentioned technical problems, the present invention provides a thermal insulation glass fiber felt, which is improved on the basis of the existing phenolic resin reinforced glass fiber felt to obtain a glass fiber felt with better thermal insulation performance, lower density and high strength.

[0004] The technical solution adopted by the present invention is: to provide a thermal insulation glass fiber felt for a low-temperature storage tank, and the preparation method of the thermal insulation glass fiber felt is: 1) Cut the glass fiber with a diameter of 7~9μm into long glass fibers with a length of 140~150mm and short glass fibers with a length of 45~50μm. 2) Fully mix and loosen the long and short glass fibers 3) Mix the opened glass fibers and spread them evenly on the feeding curtain of the carding machine 4) The glass fibers fed in step 2) are combed into a uniform fiber web by a carding machine. 5) Sprinkle phenolic resin powder and hollow glass beads evenly on the fiber net 6) The fiber web after the powdering in step 5) is conveyed to a web laying machine for web laying, and then conveyed to a drying tunnel for drying and forming to obtain a thermal insulation glass fiber felt for a low-temperature storage tank.

[0005] The thermal insulation glass fiber felt for low-temperature storage tanks further comprises the glass fiber, phenolic resin powder and hollow glass microspheres in a mass ratio of 8-9:2-2.5:0.2-0.3; the long and short glass fibers in a mass ratio of 2-3:1; the phenolic resin powder has a urotropine content of 8.5-9.5%, a free phenol content of 1-2%, a rolling degree of 22-30 at 125°C, a polymerization speed of 65-90, and a true density of 0.15-0.2 g / ml of the hollow glass microspheres. , preferably 3MK20 / K15 / S15 hollow glass microspheres.

[0006] The thermal insulation glass fiber felt for low-temperature storage tanks further comprises glass fiber, phenolic resin powder and hollow glass microspheres in a mass ratio of 9:2:0.2; and long and short glass fiber in a mass ratio of 2.5:1. The hollow glass microspheres are preferably 3MK20 / K15 / S15; The thermal insulation glass fiber felt for low-temperature storage tanks further has a drying and molding temperature in a drying tunnel of 190° C. to 210° C. and a shaping time in the drying tunnel of 3 to 4 minutes.

[0007] The present invention provides a heat-insulating glass fiber felt for a low-temperature storage tank. By adding hollow glass microspheres in a preferred ratio and specification, it is found that the heat-insulating performance of the glass fiber felt can be improved, the density can be reduced, and the high strength can be maintained unchanged. DETAILED DESCRIPTION

[0008] In order to make the present invention clearer and more specific, the technical solution of the present invention is further described in detail below. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0009] The present invention provides a thermal insulation glass fiber felt for a low-temperature storage tank, and the preparation method of the thermal insulation glass fiber felt is as follows: 1) Cut the glass fiber with a diameter of 7~9μm into long glass fibers with a length of 140~150mm and short glass fibers with a length of 45~50μm. 2) Feed the long and short glass fibers into the cotton opener for full mixing and opening; 3) The opened glass fiber mixing box is transported to the cotton feeder, and the cotton feeder evenly spreads it on the feeding curtain of the carding machine. 4) The glass fibers fed in step 2) are combed into a uniform fiber web by a carding machine. 5) Sprinkle phenolic resin powder and hollow glass beads evenly on the fiber net 6) The fiber web after powdering in step 5) is conveyed to a web laying machine for web laying, and then sent to a drying oven for drying and forming to obtain a thermal insulation glass fiber felt for low-temperature storage tanks. The temperature in the drying oven is 190°C~210°C, and the setting time is 4 minutes. The urotropine content in the phenolic resin powder is 9.2%, the free phenol content is 1.52%, the rolling degree is 28, and the polymerization speed is 86. The model of the hollow glass microsphere is 3M K20 The relevant parameters and performance test data of the embodiments and comparative examples are shown in the table below

[0010] The experimental results show that, compared with the comparative example 1, the tensile strength of the product decreased while the density decreased, and the thermal conductivity was lower, indicating that the appropriate addition of hollow glass beads can significantly improve the performance of the thermal insulation glass fiber felt, making it more suitable for applications such as the insulation of low-temperature storage tanks.

Claims

1. A thermal insulation glass fiber felt for a low-temperature storage tank, characterized in that: The preparation method of the thermal insulation glass fiber felt is: 1) Cut the glass fiber with a diameter of 7~9μm into long glass fibers with a length of 140~150mm and short glass fibers with a length of 45~50μm; 2) Fully mix and loosen the long and short glass fibers; 3) Mix the opened glass fibers and evenly spread them on the feeding curtain of the carding machine; 4) The glass fibers fed in step 2) are combed into a uniform fiber web by a carding machine; 5) Evenly sprinkle phenolic resin powder and hollow glass beads on the fiber net; 6) The fiber web after the powdering in step 5) is conveyed to a web laying machine for web laying, and then conveyed to a drying tunnel for drying and forming to obtain a thermal insulation glass fiber felt for a low-temperature storage tank.

2. The thermal insulation glass fiber felt for a low-temperature storage tank according to claim 1, characterized in that: The mass ratio of the glass fiber, phenolic resin powder and hollow glass microspheres is 8-9:2-2.5:0.2-0.3; the mass ratio of the long and short glass fibers is 2-3:1; the phenolic resin powder contains 8.5-9.5% of hexamethylenetetramine, 1-2% of free phenol, a rolling degree at 125°C of 22-30, a polymerization speed of 65-90, and a true density of the hollow glass microspheres of 0.15-0.2 g / ml.

3. The thermal insulation glass fiber felt for a low-temperature storage tank according to claim 1, characterized in that: The mass ratio of glass fiber, phenolic resin powder and hollow glass microspheres is 9:2:0.2; the mass ratio of long and short glass fibers is 2.5:

1. The model of hollow glass microspheres is 3MK20 / K15 / S15.

4. The thermal insulation glass fiber felt for a low-temperature storage tank according to claim 3, characterized in that: The drying and molding temperature in the drying tunnel is 190℃~210℃, and the shaping time in the drying tunnel is 3~4min.

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