Cold insulation module for ultra-low-temperature LNG storage and transportation and preparation method thereof

Abstract

A cold insulation module for ultra-low temperature LNG storage and transportation is disclosed, comprising, from top to bottom, a stainless steel corrugated plate, a high-density reinforced polyuretha

Description

TECHNICAL FIELD

[0001] The present disclosure relates to the technical field of liquefied natural gas (LNG), and more specifically to a cold insulation module for ultra-low-temperature LNG storage and transportation and its preparation method. BACKGROUND ART

[0002] LNG is a liquid formed by compressing and cooling natural gas to its condensation point temperature (-161.5 °C), it is usually stored in low-temperature storage tanks at around 0.1 MPa and -161.5 °C, the main component is methane, which is colorless, odorless, non-toxic, and non-corrosive. It is recognized as the cleanest energy source. With the increasing emphasis on environmental protection in China, the demand for LNG is increasing dramatically.

[0003] In the process of storing and transporting LNG, it is necessary to use insulating materials that maintain high thermal insulation, strength and stability at ultra-low temperatures. Ordinary polyurethane materials have excellent insulating properties, but shrink severely at ultra-low-temperatures and do not maintain their mechanical strength at room temperature. The mechanical properties and dimensional stability of polyurethane materials at low temperatures can be enhanced by compounding with inexpensive glass fibers, and the flame-retardant rating of polyurethane can be improved by adding certain flame retardants.

[0004] Patent 2016100894643 (Publication No. CN107090074A) discloses a high flame-retardant glass giber reinforced rigid polyurethane ultra-low-temperature insulation material using continuous glass fiber felt as reinforced material and its preparation method; Patent 2016100963709 (Publication No. CN107099018A) discloses an ultra-low-temperature non-halogen flame retardant glass fiber reinforced rigid polyurethane thermal insulation material produced by environment-friendly foaming agent and is preparation method. However, these two patents only describe the preparation method of reinforced polyurethane materials, without considering the problems of polyurethane foam itself in the process of practical application, such as low strength, easy to be damaged during transportation and installation, inconvenient to install, easy to be contaminated by moisture, and unable to withstand the impact of the drastic shaking of LNG during marine transportation, etc. In addition, none of the relevant patents take into account the risk of cracking of the polyurethane foam at ultra-low temperatures, which may lead to leakage of the transported LNG.

[0005] Therefore, how to develop a cold insulation module which can ensure the safety of storage and transportation of ultra-low-temperature LNG is an urgent problem for technicians in this field. SUMMARY

[0006] In view of the above, an object of the present disclosure is to provide a cold insulation module for ultra-low-temperature LNG storage and transportation and its preparation method, so as to solve the deficiencies in the prior art.

[0007] In order to realize the above object, the present disclosure adopts the following technical solutions:

[0008] A cold insulation module for ultra-low-temperature LNG storage and transportation, from top to bottom, is prepared by compounding a stainless-steel corrugated plate, a high-density reinforced polyurethane foam, a glass fiber aluminum foil composite material, and a low-density reinforced polyurethane foam.

[0009] Further, a thickness of the stainless-steel corrugated plate is 0.5-2.5 mm; in terms of mass percentage, the stainless-steel corrugated plate has a nickel content of 9%-12%, a chromium content of 17%-20%, a manganese content of 0.1 %-2%, a copper content of 0.1%-l%, a silicon content of 0.1%-l%, a phosphorus content of 0.01%-0.04%, and a sulfur content of 0.01%-0.02%.

[0010] Still further, a thickness of the stainless-steel corrugated plate is 1-2 mm; in terms of mass percentage, the stainless-steel corrugated plate has a nickel content of 9%-I0%, a chromium content of 18%-19%, a manganese content of 1%-1.5%, a copper content of 0.5%-l%, a silicon content of 0.1%-0.5%, a phosphorus content of 0.01%-0.02%, and a sulfur content of 0.01%-0.02%.

[0011] The beneficial effect of adopting the above technical solution is that the stainless-steel corrugated plate selected by the present disclosure can ensure that the LNG does not leak in the ultra-low-temperature storage environment at -170 °C on the one hand, and on the other hand, the corrugated structure of the surface can fully withstand the impact of liquid cargo transportation due to the shock to the stainless-steel plate as well as the deformation due to the thermal expansion and cold contraction, so as to ensure the safety and reliability of the LNG in the process of ultra-low-temperature transportation.

[0012] Further, the high-density reinforced polyurethane foam has a density of 200-500 kg / m3 and a thickness of 50-250 mm; the high-density reinforced polyurethane foam is prepared by co-mixing a polyurethane foaming composition with a polymerized diphenylmethane diisocyanate (polymerized MDI) and then pouring same on a glass fiber continuous felt, and a mass ratio of the polyurethane foaming composition, the polymerized diphenylmethane diisocyanate and the glass fiber continuous felt is (5-10):(5-10): 1; wherein, the polyurethane foaming composition is prepared by mixing a polymer polyol with a hydroxyl value of 300-500 mgKOH / g, a phosphate ester flame retardant, a polysiloxane surfactant, an amine catalyst, water and pentafluoropropane in amass ratio of (105-155):(5-15):(0.5-3):(0.1-1):(0.1-1):1.

[0013] Still further, the high-density reinforced polyurethane foam has a density7 of 400-500 kg / m3 and a thickness of 50-250 mm; the high-density reinforced polyurethane foam is prepared by co-mixing a polyurethane foaming composition with a polymerized diphenylmethane diisocyanate and then pouring same on a glass fiber continuous felt, and a mass ratio of the polyurethane foaming composition, the polymerized diphenylmethane diisocyanate and the glass fiber continuous felt is (6-7):(5-6): 1; wherein, the polyurethane foaming composition is prepared by mixing a polymer polyol with a hydroxyl value of 400 mgKOH / g, a phosphate ester flame retardant, a polysiloxane surfactant, an amine catalyst, water and pentafluoropropane in a mass ratio of 130:10:2:0.5:0.5:1.

[0014] Still further, the phosphate ester flame retardant is triethyl phosphate, the polysiloxane surfactant is a polyurethane foam stabilizer (rigid polyurethane foam uniform-foaming agent) M-8809 produced by Jiangsu MAYSTA Chemical Co. Ltd., and the amine catalyst is N, N-dimethylcyclohexylamine.

[0015] Hie beneficial effect of adopting the above further technical solution is that the selected high-density reinforced polyurethane foam of the present disclosure has higher mechanical strength, which can further improve the ability of the cold insulation module to withstand deformation.

[0016] Further, the glass fiber aluminum foil composite material has a thickness of 0.2-1.2 mm; the glass fiber aluminum foil composite material prepared by compounding a glass fiber cloth and an aluminum foil by hot-pressing through a polyurethane adhesive, and a mass ratio of the glass fiber cloth, aluminum foil and polyurethane adhesive is (50-100):(10-30): 1; wherein, the polyurethane adhesive is prepared by mixing a polyether polyol and a diphenylmethane diisocyanate in a mass ratio of (1-10):1.

[0017] Still further, the glass fiber aluminum foil composite material has a thickness of 0.5-0.9 mm; the glass fiber aluminum foil composite material prepared by compounding a glass fiber cloth and an aluminum foil by hot-pressing through a polyurethane adhesive, and a mass ratio of the glass fiber cloth, aluminum foil and polyurethane adhesive is (50-60):(20-30): 1; wherein, the polyurethane adhesive is prepared by mixing a polyether polyol and a diphenylmethane diisocyanate in a mass ratio of 5:1.

[0018] The beneficial effect of adopting the above further technical solution is that the selected glass fiber aluminum foil composite material of the present disclosure forms a completely sealed sub-shielding layer, which can ensure that the LNG does not leak to the outside for at least 15 days in the event of leakage of the stainless-steel corrugated plate.

[0019] Further, the low-density reinforced polyurethane foam has a density of 70-150 kg / m3 and a thickness of 150-350 mm; the low-density reinforced polyurethane foam is prepared by co-mixing a polyurethane foaming composition with a polymerized diphcny Im ethane diisocyanate and then pouring same on a glass fiber continuous felt, and a mass ratio of the polyurethane foaming composition, the polymerized diphenylmethane diisocyanate and the glass fiber continuous felt is (10-20):(10-20): 1; wherein, the polyurethane foaming composition is prepared by mixing a polymer polyol with a hydroxyl value of 300-500 mgKOH / g. a phosphate ester flame retardant, a polysiloxane surfactant, an amine catalyst, water and pentafliioropropane in a mass ratio of (105-155):(5-15):(0.5-3):(0.1-1):(0.1-1):1.

[0020] Still further, the low-density reinforced polyurethane foam has a density of 70-110 kg / m3 and a thickness of 150-350 mm; the low-density reinforced polyurethane foam is prepared by co-mixing a polyurethane foaming composition with a polymerized diphenylmethane diisocyanate and then pouring same on a glass fiber continuous felt, and a mass ratio of the polyurethane foaming composition, the polymerized diphenylmethane diisocyanate and the glass fiber continuous felt is (13-15):(15-18): 1; wherein, the polyurethane foaming composition is prepared by mixing a polymer polyol with a hydroxyl value of 400 mgKOH / g, a phosphate ester flame retardant, a polysiloxane surfactant, an amine catalyst, water and pentafliioropropane in a mass ratio of 130:10:2:0.5:0.5:1.

[0021] Still further, the phosphate ester flame retardant is triethyl phosphate, the polysiloxane surfactant is a polyurethane foam stabilizer (rigid polyurethane foam uniform-foaming agent) M-8809 produced by Jiangsu MAYSTA Chemical Co. Ltd., and the amine catalyst is N, N-dimethylcyclohexylamine.

[0022] The beneficial effect of adopting the above further technical solution is that the low-density reinforced polyurethane foam selected in the present disclosure, while improving a certain degree of mechanical strength, has a more excellent effect of cold insulation, and can effectively reduce the evaporation rate of LNG, so as to improve the economy of LNG transportation.

[0023] A preparation method of the cold insulation module for ultra-low-temperature LNG storage and transportation, specifically includes the following steps:

[0024] (1) Preparation of an upper structure of the cold insulation module

[0025] firstly mixing a polyurethane foaming composition with a polymerized diphenylmethane diisocyanate, then pouring same onto a glass fiber continuous felt, and then entering a conveyor chain plate for free foaming, and after natural curing, obtaining a high-density reinforced polyurethane foam, and after layering and cutting, pressing same with a stainless-steel corrugated plate together by means of a polyurethane fast curing adhesive so as to obtain an upper structure of the cold insulation module;

[0026] (2) Preparation of a lower structure of the cold insulation module

[0027] compounding a glass fiber cloth and an aluminum foil by hot-pressing through a polyurethane adhesive to obtain a glass fiber aluminum foil composite material for standby;

[0028] firstly mixing a polyurethane foaming composition with a polymerized diphenylmethane diisocyanate, then pouring same onto a glass fiber continuous felt, and entering a restricted space formed by high-strength chain plates at the upper, lower, left and right sides for foaming, and in the foaming process, using kraft paper to isolate a low-density reinforced polyurethane foam from a lower portion and four peripheral chain plates at the left and right sides, introducing the glass fiber aluminum foil composite material, directly bonding and compounding tire glass fiber aluminum foil composite material and the low-density reinforced polyurethane foam, cutting after natural curing to obtain a lower structure of the cold insulation module;

[0029] (3) Compounding of the upper structure of the cold insulation module and the lower structure of the cold insulation module

[0030] pressing the upper structure of the cold insulation module and the lower structure of the cold insulation module together by means of a polyurethane fast curing adhesive so as to obtain the cold insulation module for ultra-low-temperature LNG storage and transportation.

[0031] Further, in the above steps (1) and (3), the polyurethane fast curing adhesive is prepared by mixing a polyester polyol, a diphenylmethane diisocyanate and a dimethylcyclohexylamine in amass ratio of (1-10):(1-10):0.1.

[0032] Still further, in the above steps (1) and (3), the polyurethane fast curing adhesive is prepared by mixing a polyester polyol, a diphenylmethane diisocyanate and a dimethylcyclohexylamine in a mass ratio of 5:5:0.1.

[0033] Further, in the above step (1), an equipment for the mixing is an constant-pressure high-speed mixing head, with a rate of 1000-3000 r / min, a temperature of 10-40 °C, and a discharge volume of 50-100 kg / min; the conveyor chain plate has a temperature of 15-45°C and a forward speed of 1-2 m / min; a time for the natural curing is 60-120 days; an equipment for the pressing together is a press with a temperature of 15-45 °C, a pressure of 0.5-2.0 bar and a time of 10-30 min.

[0034] Still further, in the above step (1), an equipment for the mixing is an constant-pressure high-speed mixing head, with a rate of 2000-2500 r / min, a temperature of 15-20 °C, and a discharge volume of 50-70 kg / min; the conveyor chain plate has a temperature of 25-3 5 °C and a forward speed of 1.5-2 m / min; a time for the natural curing is 100-120 days; an equipment for the pressing together is a press with a temperature of 15-25 °C, a pressure of 0.5-1.0 bar and a time of 15-20 min.

[0035] Further, in the above step (2), an equipment for the compounding by hot-pressing is a hot-pressing hydraulic press, with a temperature of 100-200°C, a pressure of 1-5 bar, and a time of 5-15 min; an equipment for the mixing is a high-pressure mixing head, with a pressure of 50-300 bar, a temperature of 15-35°C and a discharge volume of 20-120 kg / min; the high strength chain plate has a thickness of 5-25 mm, a flatness of ±0.5-1 mm, a temperature of 15-45°C, and a forward speed of 0.5-2.5 m / min; an apparent density of the kraft paper is 90-250 g / m2; and a time for the natural curing is 60-120 days.

[0036] Still further, in the above step (2), an equipment for the compounding by hot-pressing is a hot-pressing hydraulic press, with a temperature of 150-180°C, a pressure of 1-2 bar, and a time of 5-8 min; an equipment for the mixing is a high-pressure mixing head, with a pressure of 50-100 bar, a temperature of 15-25°C and a discharge volume of 60-80 kg / min; the high strength chain plate has a thickness of 5-10 mm, a flatness of ±0.5-1 mm, a temperature of 20-30 °C, and a forward speed of 1-1.5 m / min; an apparent density of the kraft paper is 150-200 g / m2; and a time for the natural curing is 100-120 days.

[0037] The beneficial effect of adopting the above further technical solution is that the surface flatness of the cold insulation module thus produced is better, and the loss of leftover material in the subsequent finishing process is less.

[0038] Further, in the above step (3), an equipment for the pressing together is a press, with a temperature of 15-45°C, a pressure of 0.5-2.0 bar, and a time of 10-30 min.

[0039] Still further, in the above step (3), an equipment for the pressing together is a press, with a temperature of 15-25°C, a pressure of 0.5-0.9 bar, and a time of 20-30 min.

[0040] As can be seen from the above technical solutions, the beneficial effects of the present disclosure compared with the prior art are as follows:

[0041] The cold insulation module of the present disclosure uses a stainless-steel corrugated plate as the upper panel of the high-density reinforced polyurethane foam, on the one hand, the surface strength of the cold insulation module after being laminated with the stainless-steel corrugated plate is greatly improved, which ensures that the module will not be easily damaged during transportation and installation; on the other hand, the stainless-steel corrugated plate can be used as a shielding material to ensure safe storage of ultra-low-temperature LNG, and it can bear the impact and shaking of ultra-low-temperature LNG during transportation. At the same time, the cold insulation module of the present disclosure uses a glass fiber aluminum foil composite material as the upper panel of the low-density reinforced polyurethane foam, which can be used as another layer of shielding material to effectively prevent the low-temperature damage to the shell of the storage container caused by ultra-low-temperature LNG leakage due to damage to the stainless-steel corrugated plate, which ensures the safety of ultra-low-temperature LNG storage and transportation. Description of the accompanying drawings

[0042] FIG. 1 shows a schematic diagram of a structure of the cold insulation module for ultra-low-temperature LNG storage and transportation of the present disclosure;

[0043] FIG. 2 shows a process flow diagram of the preparation method of the cold insulation module for ultra-low-temperature LNG storage and transportation of the present disclosure. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0044] The following is a clear and complete description of the technical solutions in the embodiments of the present disclosure, and it is obvious that the described embodiments are only part of the embodiments of the present disclosure, not all of the embodiments. Based on the embodiments of the present disclosure, all other embodiments obtained by a person of ordinary skill in the art without creative labor are within the scope of protection of the present disclosure.

[0045] In the following embodiments and comparative examples, the polysiloxane surfactant is a polyurethane foam stabilizer (rigid polyurethane foam uniform-foaming agent) M-8809 produced by Jiangsu MAYSTA Chemical Co. Ltd.

[0046] Embodiment 1

[0047] The cold insulation module for ultra-low-temperature LNG storage and transportation, as shown in FIG. 1, from top to bottom, is prepared by compounding a stainless-steel corrugated plate, a high-density reinforced polyurethane foam, a glass fiber aluminum foil composite material, and a low-density reinforced polyurethane foam;

[0048] wherein, a thickness of the stainless-steel corrugated plate is 0.5 mm; in terms of mass percentage, the stainless-steel corrugated plate has a nickel content of 9%, a chromium content of 17%, a manganese content of 0.1%, a copper content of 0.1%, a silicon content of 0.1%, a phosphorus content of 0.01%, and a sulfur content of 0.01%;

[0049] the high-density reinforced polyurethane foam has a density of 200 kg / m3 and a thickness of 50 mm; the high-density reinforced polyurethane foam is prepared by co-mixing a polyurethane foaming composition with a polymerized diphenylmethane diisocyanate and then pouring same on a glass fiber continuous felt, and a mass ratio of the polyurethane foaming composition, the polymerized diphenylmethane diisocyanate and the glass fiber continuous felt is 5:5:1; wherein, the polyurethane foaming composition is prepared by mixing a polymer polyol with a hydroxyl value of 400 mgKOH / g, triethyl phosphate, polysiloxane surfactant, N,N-dimethylcyclohexylamine, water and pentafluoropropane in a mass ratio of 130:10:2:0.5:0.5:1;

[0050] the glass fiber aluminum foil composite material has a thickness of 0.2 mm; the glass fiber aluminum foil composite material prepared by compounding a glass fiber cloth and an aluminum foil by hot-pressing through a polyurethane adhesive, and a mass ratio of the glass fiber cloth, aluminum foil and polyurethane adhesive is 50:10:1; wherein, the polyurethane adhesive is prepared by mixing a polyether polyol and a diphenyhncthanc diisocyanate in a mass ratio of 5:1;

[0051] the low-density reinforced polyurethane foam has a density of 70 kg / m3 and a thickness of 150 mm; the low-density reinforced polyurethane foam is prepared by co-mixing a polyurethane foaming composition with a polymerized diphenylmethane diisocyanate and then pouring same on a glass fiber continuous felt, and a mass ratio of the polyurethane foaming composition, the polymerized diphenylmethane diisocyanate and the glass fiber continuous felt is 10:10:1; wherein, the polyurethane foaming composition is prepared by mixing a polymer polyol with a hydroxyl value of 400 mgKOH / g, triethyl phosphate, polysiloxane surfactant, N,N-dimethylcyclohexylamine, water and pentafluoropropane in a mass ratio of 130:10:2:0.5:0.5:1;

[0052] the preparation method of the above cold insulation module for ultra-low-temperature LNG storage and transportation, as shown in FIG. 2, specifically includes the following steps:

[0053] (1) Preparation of an upper structure of the cold insulation module

[0054] Firstly, polyurethane foaming composition and polymerized diphenylmethane diisocyanate are added into a constant-pressure high-speed mixing head for mixing at a mixing rate of 1000 r / min, a temperature of 10 °C and a discharge volume of 50 kg / min; then the mixture is poured onto the paved glass fiber continuous felt and sent into the conveyor chain plate for free foaming at a temperature of the conveyor chain plate of 15 °C and a forward speed of 1 m / min; after natural curing for 60 days, the high-density reinforced polyurethane foam is obtained to be pressed with the stainless-steel corrugated plate together by means of a polyurethane fast curing adhesive after layering and cutting, wherein the temperature of pressing is 15 °C, the pressure is 0.5 bar, and the time is 10 min, so that the upper structure of the cold insulation module is obtained; wherein the polyurethane fast curing adhesive is prepared by mixing a polyester polyol, a diphenylmethane diisocyanate and a dimethylcyclohexylamine in a mass ratio of 5:5:0.1.

[0055] (2) Preparation of a lower structure of the cold insulation module

[0056] The glass fiber cloth and aluminum foil are added to a hot-pressing hydraulic press for compounding by hot-pressing through a polyurethane adhesive at a temperature of 100 °C, a pressure of 1 bar and a time of 5 min to obtain a glass fiber aluminum foil composite material for standby;

[0057] Firstly, polyurethane foaming composition and polymerized diphenylmethane diisocyanate are added into a high-pressure mixing head for mixing at a mixing pressure of 50 bar, a temperature of 15 °C and a discharge volume of 20 kg / min; then the mixture are poured onto the paved glass fiber continuous felt and sent into a restricted space formed by high-strength chain plates at the upper, lower, left and right sides for foaming, wherein the high strength chain plate has a thickness of 5 mm, a flatness of ±0.5 mm, a temperature of 15 °C, and a forward speed of 0.5 m / min; a kraft paper with an apparent density of 90 g / m2 is adopted to isolate a low-density reinforced polyurethane foam from a lower portion and four peripheral chain plates at the left and right sides during foaming, and the glass fiber aluminum foil composite material is introduced, directly bonded and compounded with the low-density reinforced polyurethane foam, and after natural curing for 60 days, cutting is performed to obtain the lower structure of the cooling insulation module;

[0058] (3) Compounding of the upper structure of the cold insulation module and the lower structure of the cold insulation module

[0059] Hie upper structure of the cold insulation module and the lower structure of the cold insulation module are pressed together by adding a polyurethane fast curing adhesive into a press, in which the pressing temperature is 15°C, the pressure is 0.5 bar, and the time is 10 min, so as to obtain a cold insulation module for ultra-low-temperature LNG storage and transportation; wherein, the polyurethane fast curing adhesive is prepared by mixing a polyester polyol, a diphenylmethane diisocyanate and a dimethylcyclohexylamine in a mass ratio of 5:5:0.1.

[0060] Embodiment 2

[0061] The cold insulation module for ultra-low-temperature LNG storage and transportation, as shown in FIG. 1, from top to bottom, is prepared by compounding a stainless-steel corrugated plate, a high-density reinforced polyurethane foam, a glass fiber aluminum foil composite material, and a low-density reinforced polyurethane foam;

[0062] wherein, a thickness of the stainless-steel corrugated plate is 2.5 mm; in terms of mass percentage, the stainless-steel corrugated plate has a nickel content of 12%, a chromium content of 20%, a manganese content of 2%, a copper content of 1%, a silicon content of 1%, a phosphorus content of 0.04%, and a sulfur content of 0.02%;

[0063] the high-density reinforced polyurethane foam has a density of 500 kg / m3 and a thickness of 250 mm; the high-density reinforced polyurethane foam is prepared by co-mixing a polyurethane foaming composition with a polymerized diphenylmethane diisocyanate and then pouring same on a glass fiber continuous felt, and a mass ratio of the polyurethane foaming composition, the polymerized diphenylmethane diisocyanate and the glass fiber continuous felt is 10:10:1; wherein, the polyurethane foaming composition is prepared by mixing a polymer polyol with a hydroxyl value of 300 mgKOH / g, triethyl phosphate, polysiloxane surfactant, N,N-dimethylcyclohexylamine, water and pentafluoropropane in a mass ratio of 105:5:0.5:0.1:0.1:1;

[0064] the glass fiber aluminum foil composite material has a thickness of 1.2 mm; the glass fiber aluminum foil composite material prepared by compounding a glass fiber cloth and an aluminum foil by hot-pressing through a polyurethane adhesive, and a mass ratio of die glass fiber cloth, aluminum foil and polyurethane adhesive is 100:30:1; wherein, die polyurethane adhesive is prepared by mixing a polyether polyol and a diphenylmethane diisocyanate in a mass ratio of 1:1;

[0065] the low-density reinforced polyurethane foam has a density of 150 kg / m3 and a thickness of 350 mm; the low-density reinforced polyurethane foam is prepared by co-mixing a polyurethane foaming composition with a polymerized diphenylmethane diisocyanate and then pouring same on a glass fiber continuous felt, and a mass ratio of the polyurethane foaming composition, the polymerized diphenylmethane diisocyanate and the glass fiber continuous felt is 20:20:1; wherein, the polyurethane foaming composition is prepared by mixing a polymer polyol with a hydroxyl value of 300 mgKOH / g, triethyl phosphate, polysiloxane surfactant, N,N-dimethylcyclohexylamine. water and pentafluoropropane in amass ratio of 105:5:0.5:0.1:0.1:1;

[0066] the preparation method of the above cold insulation module for ultra-low-temperature LNG storage and transportation, as shown in FIG. 2, specifically includes the following steps:

[0067] (1) Preparation of an upper structure of the cold insulation module

[0068] Firstly, polyurethane foaming composition and polymerized diphenylmethane diisocyanate are added into a constant-pressure high-speed mixing head for mixing at a mixing rate of 3000 r / min, a temperature of 40 °C and a discharge volume of 100 kg / min; then the mixture is poured onto the paved glass fiber continuous felt and sent into the conveyor chain plate for free foaming at a temperature of the conveyor chain plate of 45 °C and a forward speed of 2 m / min; after natural curing for 120 days, the high-density reinforced polyurethane foam is obtained to be pressed with the stainless-steel corrugated plate together by means of a polyurethane fast curing adhesive after layering and cutting, wherein the temperature of pressing is 45 °C, the pressure is 2.0 bar, and the time is 30 min, so that the upper structure of the cold insulation module is obtained; wherein the polyurethane fast curing adhesive is prepared by mixing a polyester polyol, a diphenylmethane diisocyanate and a dimethylcyclohexylamine in a mass ratio of 1:1:0.1.

[0069] (2) Preparation of a lower structure of the cold insulation module

[0070] The glass fiber cloth and aluminum foil are added to a hot-pressing hydraulic press for compounding by hot-pressing through a polyurethane adhesive at a temperature of 200 °C, a pressure of 5 bar and a time of 15 min to obtain a glass fiber aluminum foil composite material for standby;

[0071] Firstly, polyurethane foaming composition and polymerized diphenylmethane diisocyanate are added into a high-pressure mixing head for mixing at a mixing pressure of 300 bar, a temperature of 35 °C and a discharge volume of 120 kg / min; then the mixture is poured onto the paved glass fiber continuous felt and sent into a restricted space formed by high-strength chain plates at the upper, lower, left and right sides for foaming, wherein the high strength chain plate has a thickness of 25 mm, a flatness of ±1 mm, a temperature of 45 °C, and a forward speed of 2.5 m / min; a kraft paper with an apparent density of 250 g / m2 is adopted to isolate a low-density reinforced polyurethane foam from a lower portion and four peripheral chain plates at the left and right sides during foaming, and the glass fiber aluminum foil composite material is introduced, directly bonded and compounded with the low-density reinforced polyurethane foam, and after natural curing for 120 days, cutting is performed to obtain the lower structure of the cooling insulation module;

[0072] (3) Compounding of the upper structure of the cold insulation module and the lower structure of the cold insulation module

[0073] The upper structure of the cold insulation module and the lower structure of the cold insulation module are pressed together by adding a polyurethane fast curing adhesive into a press, in which the pressing temperature is 45°C, the pressure is 2.0 bar, and the time is 30 min, so as to obtain a cold insulation module for ultra-low-temperature LNG storage and transportation; wherein, the polyurethane fast curing adhesive is prepared by mixing a polyester polyol, a diphenylmethane diisocyanate and a dimethylcyclohexylamine in a mass ratio of 1:1:0.1.

[0074] Embodiment 3

[0075] The cold insulation module for ultra-low-temperature LNG storage and transportation, as shown in FIG. 1, from top to bottom, is prepared by compounding a stainless-steel corrugated plate, a high-density reinforced polyurethane foam, a glass fiber aluminum foil composite material, and a low-density7 reinforced polyurethane foam;

[0076] wherein, a thickness of the stainless-steel corrugated plate is 0.6 mm; in terms of mass percentage, the stainless-steel corrugated plate has a nickel content of 11%, a chromium content of 19%, a manganese content of 0.2%, a copper content of 0.9%, a silicon content of 0.2%, a phosphorus content of 0.03%, and a sulfur content of 0.01%;

[0077] the high-density reinforced polyurethane foam has a density of 250 kg / m ' and a thickness of 200 mm; the high-density reinforced polyurethane foam is prepared by co-mixing a polyurethane foaming composition with a polymerized diphenylmethane diisocyanate and then pouring same on a glass fiber continuous felt, and a mass ratio of the polyurethane foaming composition, the polymerized diphenylmethane diisocyanate and the glass fiber continuous felt is 6:8:1; wherein, the polyurethane foaming composition is prepared by mixing a polymer polyol with a hydroxyl value of 400 mgKOH / g, triethyl phosphate, polysiloxane surfactant, N,N-dimethylcyclohexylamine, water and pentafluoropropane in a mass ratio of 130:10:2:0.5:0.5:1;

[0078] the glass fiber aluminum foil composite material has a thickness of 0.4 mm; the glass fiber aluminum foil composite material prepared by compounding a glass fiber cloth and an aluminum foil by hot-pressing through a polyurethane adhesive, and a mass ratio of the glass fiber cloth, aluminum foil and polyurethane adhesive is 60:20:1; wherein, the polyurethane adhesive is prepared by mixing a polyether polyol and a diphenylmethane diisocyanate in a mass ratio of 5:1;

[0079] the low-density reinforced polyurethane foam has a density of 90 kg / m3 and a thickness of 300 mm; the low-density reinforced polyurethane foam is prepared by co-mixing a polyurethane foaming composition with a polymerized diphenylmethane diisocyanate and then pouring same on a glass fiber continuous felt, and a mass ratio of the polyurethane foaming composition, the polymerized diphenylmethane diisocyanate and the glass fiber continuous felt is 15:15:1; wherein, the polyurethane foaming composition is prepared by mixing a polymer polyol with a hydroxyl value of 300 mgKOH / g, triethyl phosphate, polysiloxane surfactant, N,N-dimethylcyclohexylamine, water and pentafluoropropane in a mass ratio of 130:10:2:0.5:0.5:1;

[0080] the preparation method of the above cold insulation module for ultra-low-temperature LNG storage and transportation, as shown in FIG. 2, specifically includes the following steps:

[0081] (1) Preparation of an upper structure of the cold insulation module

[0082] Firstly, polyurethane foaming composition and polymerized diphenylmethane diisocyanate are added into a constant-pressure high-speed mixing head for mixing at a mixing rate of 1500 r / min, a temperature of 20 °C and a discharge volume of 60 kg / min; then the mixture is poured onto the paved glass fiber continuous felt and sent into the conveyor chain plate for free foaming at a temperature of the conveyor chain plate of 35 °C and a forward speed of 1.8 m / min; after natural curing for 90 days, the high-density reinforced polyurethane foam is obtained to be pressed with the stainless-steel corrugated plate together by means of a polyurethane fast curing adhesive after layering and cutting, wherein the temperature of pressing is 35 °C, the pressure is 1.6 bar, and the time is 30 min, so that the upper structure of the cold insulation module is obtained; wherein the polyurethane fast curing adhesive is prepared by mixing a polyester polyol, a diphenylmethane diisocyanate and a dimethylcyclohexylamine in a mass ratio of 5:5:0.1.

[0083] (2) Preparation of a lower structure of the cold insulation module

[0084] The glass fiber cloth and aluminum foil are added to a hot-pressing hydraulic press for compounding by hot-pressing through a polyurethane adhesive at a temperature of 150 °C, a pressure of 3 bar and a time of 10 min to obtain a glass fiber aluminum foil composite material for standby;

[0085] Firstly, polyurethane foaming composition and polymerized diphenylmethane diisocyanate are added into a high-pressure mixing head for mixing at a mixing pressure of 120 bar, a temperature of 20 °C and a discharge volume of 40 kg / min; then the same are poured onto the paved glass fiber continuous felt and sent into a restricted space formed by high-strength chain plates at the upper, lower, left and right sides for foaming, wherein the high strength chain plate has a thickness of 10 mm, a flatness of ±0.5 mm, a temperature of 25 °C, and a forward speed of 1.5 m / min; a kraft paper with an apparent density of 110 g / nr is adopted to isolate a low-density reinforced polyurethane foam from a lower portion and four peripheral chain plates at the left and right sides during foaming, and the glass fiber aluminum foil composite material is introduced, directly bonded and compounded with the low-density reinforced polyurethane foam, and after natural curing for 100 days, cutting is performed to obtain the lower structure of the cooling insulation module;

[0086] (3) Compounding of the upper structure of the cold insulation module and the lower structure of the cold insulation module

[0087] Hie upper structure of the cold insulation module and the lower structure of the cold insulation module are pressed together by adding a polyurethane fast curing adhesive into a press, in which the pressing temperature is 40°C, the pressure is 1.0 bar, and the time is 20 min, so as to obtain a cold insulation module for ultra-low-temperature LNG storage and transportation; wherein, the polyurethane fast curing adhesive is prepared by mixing a polyester polyol, a diphenylmethane diisocyanate and a dimethylcyclohexylamine in a mass ratio of 5:5:0.1.

[0088] Embodiment 4

[0089] The cold insulation module for ultra-low-temperature LNG storage and transportation, as shown in FIG. 1, from top to bottom, is prepared by compounding a stainless-steel corrugated plate, a high-density reinforced polyurethane foam, a glass fiber aluminum foil composite material, and a low-density reinforced polyurethane foam;

[0090] wherein, a thickness of the stainless-steel corrugated plate is 1.5 mm; in terms of mass percentage, the stainless-steel corrugated plate has a nickel content of 10%, a chromium content of 18%, a manganese content of 1.2%, a copper content of 0.6%, a silicon content of 0.6%, a phosphorus content of 0.01%, and a sulfur content of 0.01%;

[0091] the high-density reinforced polyurethane foam has a density of 450 kg / m3 and a thickness of 90 mm; the high-density reinforced polyurethane foam is prepared by co-mixing a polyurethane foaming composition with a polymerized diphenylmethane diisocyanate and then pouring same on a glass fiber continuous felt, and a mass ratio of the polyurethane foaming composition, the polymerized diphenylmethane diisocyanate and the glass fiber continuous felt is 8:6:1; wherein, the polyurethane foaming composition is prepared by mixing a polymer polyol with a hydroxyl value of 400 mgKOH / g, triethyl phosphate, polysiloxane surfactant, N,N-dimethylcyclohexylamine, water and pentafluoropropane in a mass ratio of 155:15:3:1:1:1;

[0092] the glass fiber aluminum foil composite material has a thickness of 0.8 mm; the glass fiber aluminum foil composite material prepared by compounding a glass fiber cloth and an aluminum foil by hot-pressing through a polyurethane adhesive, and a mass ratio of the glass fiber cloth, aluminum foil and polyurethane adhesive is 90:15:1; wherein, the polyurethane adhesive is prepared by mixing a polyether polyol and a diphenylmethane diisocyanate in a mass ratio of 10:1;

[0093] the low-density reinforced polyurethane foam has a density of 110 kg / m3 and a thickness of 250 mm; the low-density reinforced polyurethane foam is prepared by co-mixing a polyurethane foaming composition with a polymerized diphenylmethane diisocyanate and then pouring same on a glass fiber continuous felt, and a mass ratio of the polyurethane foaming composition, the polymerized diphenylmethane diisocyanate and the glass fiber continuous felt is 10:20:1; wherein, the polyurethane foaming composition is prepared by mixing a polymer polyol with a hydroxyl value of 500 mgKOH / g, triethyl phosphate, polysiloxane surfactant, N,N-dimethylcyclohexylamine, water and pentafluoropropane in a mass ratio of 155:15:3:1:1:1;

[0094] the preparation method of the above cold insulation module for ultra-low-temperature LNG storage and transportation, as shown in FIG. 2, specifically includes the following steps:

[0095] (1) Preparation of an upper structure of the cold insulation module

[0096] Firstly, polyurethane foaming composition and polymerized diphenylmethane diisocyanate are added into a constant-pressure high-speed mixing head for mixing at a mixing rate of 1800 r / min, a temperature of 30 °C and a discharge volume of 80 kg / min; then the mixture is poured onto the paved glass fiber continuous felt and sent into the conveyor chain plate for free foaming at a temperature of the conveyor chain plate of 25 °C and a forward speed of 1.5 m / min; after natural curing for 80 days, the high-density reinforced polyurethane foam is obtained to be pressed with the stainless-steel corrugated plate together by means of a polyurethane fast curing adhesive after layering and cutting, wherein the temperature of pressing is 30 °C, the pressure is 1.2 bar, and the time is 20 min, so that the upper structure of the cold insulation module is obtained; wherein the polyurethane fast curing adhesive is prepared by mixing a polyester polyol, a diphenylmethane diisocyanate and a dimethylcyclohexylamine in a mass ratio of 10:10:0.1.

[0097] (2) Preparation of a lower structure of the cold insulation module

[0098] The glass fiber cloth and aluminum foil are added to a hot-pressing hydraulic press for compounding by hot-pressing through a polyurethane adhesive at a temperature of 180 °C, a pressure of 2 bar and a time of 13 min to obtain a glass fiber aluminum foil composite material for standby;

[0099] Firstly, polyurethane foaming composition and polymerized diphenylmethane diisocyanate are added into a high-pressure mixing head for mixing at a mixing pressure of 200 bar, a temperature of 25 °C and a discharge volume of 50 kg / min; then the mixture is poured onto the paved glass fiber continuous felt and sent into a restricted space formed by high-strength chain plates at the upper, lower, left and right sides for foaming, wherein the high strength chain plate has a thickness of 8 mm, a flatness of ±0.5 mm, a temperature of 30 °C, and a forward speed of 1.0 m / min; a kraft paper with an apparent density of 150 g / m2 is adopted to isolate a low-density reinforced polyurethane foam from a lower portion and four peripheral chain plates at the left and right sides during foaming, and the glass fiber aluminum foil composite material is introduced, directly bonded and compounded with the low-density reinforced polyurethane foam, and after natural curing for 90 days, cutting is performed to obtain the lower structure of the cooling insulation module;

[00100] (3) Compounding of the upper structure of the cold insulation module and the lower structure of the cold insulation module

[00101] The upper structure of the cold insulation module and the lower structure of the cold insulation module are pressed together by adding a polyurethane fast curing adhesive into a press, in which the pressing temperature is 30°C, the pressure is 1.7 bar, and the time is 25 min, so as to obtain a cold insulation module for ultra-low-temperature LNG storage and transportation; wherein, the polyurethane fast curing adhesive is prepared by mixing a polyester polyol, a diphenylmethane diisocyanate and a dimethylcyclohexylamine in a mass ratio of 10:10:0.1.

[00102] Comparative Example 1

[00103] A cold insulation module for ultra-low-temperature LNG storage and transportation, from top to bottom, is prepared by compounding a birch plywood, a high-density reinforced polyurethane foam, a glass fiber aluminum foil composite material, and a low-density reinforced polyurethane foam;

[00104] wherein, the birch plywood has a density of 700kg / m3 and a thickness of 2 mm;

[00105] the high-density reinforced polyurethane foam has a density of 350 kg / m3 and a thickness of 110 mm; the high-density reinforced polyurethane foam is prepared by co-mixing a polyurethane foaming composition with a polymerized diphenylmethane diisocyanate and then pouring same on a glass fiber continuous felt, and a mass ratio of the polyurethane foaming composition, the polymerized diphenylmethane diisocyanate and the glass fiber continuous felt is 7:9:1; wherein, the polyurethane foaming composition is prepared by mixing a polymer polyol with a hydroxyl value of 400 mgKOH / g, triethyl phosphate, polysiloxane surfactant, N,N-dimethylcyclohexylamine, water and pentafluoropropane in amass ratio of 130:10:2:0.5:0.5:1;

[00106] the glass fiber aluminum foil composite material has a thickness of 1 mm; the glass fiber aluminum foil composite material prepared by compounding a glass fiber cloth and an aluminum foil by hot-pressing through a polyurethane adhesive, and a mass ratio of the glass fiber cloth, aluminum foil and polyurethane adhesive is 80:10:1; wherein, the polyurethane adhesive is prepared by mixing a polyether polyol and a diphenylmethane diisocyanate in a mass ratio of 5:1;

[00107] the low-density reinforced polyurethane foam has a density of 80 kg / m3 and a thickness of 300 mm; the low-density reinforced polyurethane foam is prepared by co-mixing a polyurethane foaming composition with a polymerized diphenylmethane diisocyanate and then pouring same on a glass fiber continuous felt, and a mass ratio of the polyurethane foaming composition, the polymerized diphenylmethane diisocyanate and the glass fiber continuous felt is 10:10:1; wherein, the polyurethane foaming composition is prepared by mixing a polymer polyol with a hydroxyl value of 400 mgKOH / g, triethyl phosphate, polysiloxane surfactant, N,N-dimethylcyclohexylamine, water and pentafluoropropane in a mass ratio of 130:10:2:0.5:0.5:1;

[00108] the preparation method of the above cold insulation module for ultra-low-temperature LNG storage and transportation specifically includes the following steps:

[00109] (1) Preparation of an upper structure of the cold insulation module

[00110] Firstly, polyurethane foaming composition and polymerized diphenylmethane diisocyanate are added into a constant-pressure high-speed mixing head for mixing at a mixing rate of 2000 r / min, a temperature of 25 °C and a discharge volume of 70 kg / min; then the mixture is poured onto the paved glass fiber continuous felt and sent into the conveyor chain plate for free foaming at a temperature of the conveyor chain plate of 25 °C and a forward speed of 1.8 m / min; after natural curing for 100 days, the high-density reinforced polyurethane foam is obtained to be pressed with the birch plywood together by means of a polyurethane fast curing adhesive after layering and cutting, wherein the temperature of pressing is 30 °C, the pressure is 1.5 bar, and the time is 30 min, so that the upper structure of the cold insulation module is obtained; wherein the polyurethane fast curing adhesive is prepared by mixing a polyester polyol, a diphenylmethane diisocyanate and a dimethylcyclohexylamine in a mass ratio of 5:5:0.1.

[00111] (2) Preparation of a lower structure of the cold insulation module

[00112] The glass fiber cloth and aluminum foil are added to a hot-pressing hydraulic press for compounding by hot-pressing through a polyurethane adhesive at a temperature of 120 °C, a pressure of 4 bar and a time of 15 min to obtain a glass fiber aluminum foil composite material for standby;

[00113] Firstly, polyurethane foaming composition and polymerized diphenylmethane diisocyanate are added into a high-pressure mixing head for mixing at a mixing pressure of 250 bar, a temperature of 35 °C and a discharge volume of 40 kg / min; then the mixture is poured onto the paved glass fiber continuous felt and sent into a restricted space formed by high-strength chain plates at the upper, lower, left and right sides for foaming, wherein the high strength chain plate has a thickness of 10 mm, a flatness of ±0.5 mm, a temperature of 25 °C, and a forward speed of 1.5 m / min; a kraft paper with an apparent density of 130 g / m2 is adopted to isolate a low-density reinforced polyurethane foam from a lower portion and four peripheral chain plates at the left and right sides during foaming, and the glass fiber aluminum foil composite material is introduced, directly bonded and compounded with the low-density reinforced polyurethane foam, and after natural curing for 90 days, cutting is performed to obtain the lower structure of the cooling insulation module;

[00114] (3) Compounding of the upper structure of the cold insulation module and the lower structure of the cold insulation module

[00115] The upper structure of the cold insulation module and the lower structure of the cold insulation module are pressed together by adding a polyurethane fast curing adhesive into a press, in which the pressing temperature is 20°C, the pressure is 1.5 bar, and the time is 30 min, so as to obtain a cold insulation module for ultra-low-temperature LNG storage and transportation; wherein, the polyurethane fast curing adhesive is prepared by mixing a polyester polyol, a diphenylmcthane diisocyanate and a dimethylcyclohexylamine in a mass ratio of 5:5:0.1.

[00116] Comparative Example 2

[00117] A cold insulation module for ultra-low-temperature LNG storage and transportation, from top to bottom, is prepared by compounding a stainless-steel corrugated plate, a high-density reinforced polyurethane foam, an ordinary aluminum plate, and a low-density reinforced polyurethane foam;

[00118] wherein, a thickness of the stainless-steel corrugated plate is 1.8 mm; in terms of mass percentage, the stainless-steel corrugated plate has a nickel content of 9%, a chromium content of 18%, a manganese content of 1%, a copper content of 0.5%, a silicon content of 0.65%, a phosphorus content of 0.01%, and a sulfur content of 0.01%;

[00119] the high-density reinforced polyurethane foam has a density of 400 kg / nr' and a thickness of 110 mm; the high-density reinforced polyurethane foam is prepared by co-mixing a polyurethane foaming composition with a polymerized diphenylmethane diisocyanate and then pouring same on a glass fiber continuous felt, and a mass ratio of the polyurethane foaming composition, the polymerized diphenylmethane diisocyanate and the glass fiber continuous felt is 8:8:1; wherein, the polyurethane foaming composition is prepared by mixing a polymer polyol with a hydroxyl value of 400 mgKOH / g, triethyl phosphate, polysiloxane surfactant, N,N-dimethylcyclohexylamine, water and pentafluoropropane in a mass ratio of 130:10:2:0.5:0.5:1;

[00120] the ordinary aluminum plate has a thickness of 1mm;

[00121] the low-density reinforced polyurethane foam has a density of 100 kg / m3 and a thickness of 300 mm; the low-density reinforced polyurethane foam is prepared by co-mixing a polyurethane foaming composition with a polymerized diphenylmethane diisocyanate and then pouring same on a glass fiber continuous felt, and a mass ratio of the polyurethane foaming composition, the polymerized diphenylmethane diisocyanate and the glass fiber continuous felt is 8:10:1; wherein, the polyurethane foaming composition is prepared by mixing a polymer polyol with a hydroxyl value of 300 mgKOH / g, triethyl phosphate, polysiloxane surfactant, N,N-dimethylcyclohexylamine, water and pentafluoropropane in a mass ratio of 130:10:2:0.5:0.5:1;

[00122] the preparation method of the above cold insulation module for ultra-low-temperature LNG storage and transportation specifically includes the following steps:

[00123] (1) Preparation of an upper structure of the cold insulation module

[00124] Firstly, polyurethane foaming composition and polymerized diphenylmethane diisocyanate are added into a constant-pressure high-speed mixing head for mixing at a mixing rate of 2500 r / min, a temperature of 30 °C and a discharge volume of 70 kg / min; then the mixture is poured onto the paved glass fiber continuous felt and sent into the conveyor chain plate for free foaming at a temperature of the conveyor chain plate of 35 °C and a forward speed of 2 m / min; after natural curing for 100 days, the high-density reinforced polyurethane foam is obtained to be pressed with the stainless-steel corrugated plate together by means of a polyurethane fast curing adhesive after layering and cutting, wherein the temperature of pressing is 30 °C, the pressure is 1.7 bar, and the time is 25 min, so that the upper structure of the cold insulation module is obtained; wherein the polyurethane fast curing adhesive is prepared by mixing a polyester polyol, a diphenylmethane diisocyanate and a dimethylcyclohexylamine in a mass ratio of 5:5:0.1.

[00125] (2) Preparation of a lower structure of the cold insulation module

[00126] Firstly, polyurethane foaming composition and polymerized diphenylmethane diisocyanate are added into a high-pressure mixing head for mixing at a mixing pressure of 220 bar, a temperature of 30 °C and a discharge volume of 50 kg / min; then the mixture is poured onto the paved glass fiber continuous felt and sent into a restricted space formed by high-strength chain plates at the upper, lower, left and right sides for foaming, wherein the high strength chain plate has a thickness of 10 mm, a flatness of ±0.5 mm, a temperature of 25 °C, and a forward speed of 1.3 m / min; a kraft paper with an apparent density of 160 g / m2 is adopted to isolate a low-density reinforced polyurethane foam from a lower portion and four peripheral chain plates at the left and right sides during foaming, and the ordinary aluminum plate is introduced, directly bonded and compounded with the low-density reinforced polyurethane foam, and after natural curing for 90 days, cutting is performed to obtain the lower structure of the cooling insulation module;

[00127] (3) Compounding of the upper structure of the cold insulation module and the lower structure of the cold insulation module

[00128] The upper structure of the cold insulation module and the lower structure of the cold insulation module are pressed together by adding a polyurethane fast curing adhesive into a press, in which the pressing temperature is 25°C, the pressure is 1.3 bar, and the time is 30 min, so as to obtain a cold insulation module for ultra-low-temperature LNG storage and transportation; wherein, the polyurethane fast curing adhesive is prepared by mixing a polyester polyol, a diphenylmethane diisocyanate and a dimethylcyclohexylamine in a mass ratio of 5:5:0.1.

[00129] Performance test

[00130] The cold insulation modules for ultra-low-temperature LNG storage and transportation prepared in embodiments 1-4 and comparative examples 1-2 were used, and the impact strength thereof was tested according to GB / T 1043.1-2008 respectively, the tensile strength thereof was tested according to BS ISO 1926-2005 under the condition of 20 °C, and the leftover material loss rate thereof was calculated respectively. Wherein, leftover material loss rate = net material volume / blank material volume x 100%.

[00131] The test results are shown in Table 1.

[00132] Table 1 Performance test results of the cold insulation modules for ultra-low-temperature LNG storage and transportation of embodiments 1-4 and comparative examples 1-2 Test item Embodiment 1 Embodiment 2 Embodiment 3 Embodiment 4 Comparative example 1 Comparative example 2 Impact strength (KJ / m2) 68 58 66 66 30 57

[00133] Tensile strength (MPa) 3.3 3.1 3.6 3.2 3.2 1.8 Leftover material loss rate C%) 11 10 10 11 18 19

[00134] As can be seen from Table 1, compared with the comparative examples 1-2, the impact strength and tensile strength of the cold insulation modules in embodiments 1-4 have been significantly strengthened, and the leftover material loss rate has been significantly reduced.

[00135] The above tests show that the cold insulation module for ultra-low-temperature LNG storage and transportation of the present disclosure has excellent impact strength and tensile strength, which can effectively prevent low-temperature damage to the shell of the storage container caused by leakage of ultra-low-temperature LNG, and ensure the safety of ultra-low-temperature LNG storage and transportation.

[00136] The above description of the disclosed embodiments enables those skilled in the art to realize or use the present disclosure. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be realized in other embodiments without departing from the spirit or scope of the present disclosure. Accordingly, the present disclosure will not be limited to these embodiments shown herein, but will conform to the broadest scope consistent with the principles and novel features disclosed herein.

Claims

1. A cold insulation module for ultra-low-temperature LNG storage and transportation, wherein, from top to bottom, the module is prepared by compounding a stainless-steel •corrugatedplate, a-high-density reinforced.polyurethane-foam, a glass fiber aluminum, foil composite material, and a low-density reinforced polyurethane foam, wherein the high-density reinforced polyurethane foam and the stainless-steel corrugated plate are bonded together to form an upper structure of the cold insulation module, and the glass fiber aluminum foil composite material and the low-density reinforced polyurethane foam'are bonded together to form, a lower structure of the cold insulation module, and the'Upper structure and the lower structure are-bonded together.2,The cold insulation module for ultra-low-temperature LNG storage and transportation of claim 1, wherein a thickness of the stainless-steel corrugated plate is 0.5-2.5 mm;'in terms of mass percentage, the stainless-steel corrugated plate has-a nickel content'of 9%-12%, a chromium content of 17%-20%, a manganese content of 0,1%-2%^ a copper content of 0.1%-I%, a silicon content of 0.1%-l%, a phosphorus content of 0.01 %-0.04%, and a sulfur content of 0.01 %-0.62%.3, The cold insulation module, for.ultra-low-temperature LNG storage and transportation of claim 1, wherein the high-density reinforced polyurethane foam has a density of 200-500 kg / m3 and a thickness of 50-250 mm;the high-density reinforced polyurethane foam is prepared by co-mixing a polyurethane 'foaming composition with a polymerized diphenylmethane diisocyanate and then, pouring' same on a.-glass' fiber' continuous felt, .and. a.mass ratio of the polyurethane foaming composition, the polymerized diphenylmethane diisocyanate and. the glass fiber continuous felt is (5-10):(5-10):1; wherein, the polyurethane foaming composition is prepared by mixing a polymer polyol with a hydroxyl value of 300-500 mgKOH / g, a phosphate ester flame retardant, a polysiloxane surfactant, an amine.catalyst, water and pentafluoropropane in a mass ratio of (105-155):(5-15):(0..5-3):(0.1-1):(0.1-1):1.

4. The cold insulation module for ultra-low-temperature LNG storage and transportation of claim 1, wherein the glass fiber aluminum foil composite material has a thickness of 0.2-1.2 mm:■the glass fiber aluminum foil composite material prepared by compounding a glass fiber cloth and an aluminum foil by hot-pressing through a polyurethane adhesive, and a mass ratio of the glass fiber cloth, aluminum foil and polyurethane adhesive is (50-100):(10-30):1; wherein, the polyurethane adhesive is prepared by mixing a polyether polyol and a diphenyimethanediisocyanate in amass ratio of (1-10):1.

5. The cold.insulation module for■ ultra-low-temperature LNG storage and transportation of claim 1, wherein the low-density reinforced polyurethane foam has a density of 70-150 kg / m3 and a thickness of 150-350 mm;the low-density reinforced polyurethane foam is prepared by co-mixing a polyurethane foaming composition with a polymerized diphenylmethane diisocyanate and then, pouring same on a glass fiber continuous felt, and a mass ratio of the polyurethane foaming composition, the polymerized diphenylmethane di isocyanate and the glass fiber continuous felt is (10-20):(10-20): 1; wherein, the polyurethane foaming composition is prepared by mixing a polymer polyol with a hydroxyl Value of300-500 mgKOH / g, a phosphate ester flame retardant, a polysiloxane surfactant, an amine' catalyst, water and pentafluoropropane in a mass ratio of (105-155):(5-15):(0.5-3):(0.1-1):(0.1-1):1.

6. A preparation method of the cold insulation module 'for'ultra-low-temperature' LNG storage and transportation of'claim 1, wherein the preparation, method specifically" comprises following steps:(1) Preparation of an upper structure of the cold insulation modulefirstly mixing a polyurethane foaming composition with a polymerized diphenylmethane diisocyanate, then pouring; same onto a glass fiber continuous felt, and then entering a conveyor chain plate for free .foaming, and after natural curing, obtaining a high-density reinforced polyurethane foam, and after layering and cutting, 27pressing same with a stainless-steel corrugated plate together by means of a polyurethane fast curing adhesive so as to obtain an upper structure of the cold insulation module;.(2) Preparation of a lower structure of the cold insulation modulecompounding a glass fiber cloth-.and an aluminum foil by hot-pressing through, a polyurethane adhesive to obtain a glass fiber aluminum foil composite material for standby;firstly mixing a polyurethane foaming composition with a polymerized 'dipheriylmethane diisbcyanate, then pouring same onto a glass fiber Continuous felt, and 'entering'a restricted space'formed by high-strength chain:plates-at the upper,, lower, left'.' and right sides for foaming, and in the foaming process, using kraft paper to isolate a low-density reinforced polyurethane foam from a lower portion and four peripheral chain plates at the left and right sides, introducing the glass fiber aluminum foil 'composite material, directly bonding and compounding the glass fiber aluminum foil, composite material and the low-density reinforced polyurethane foam, cutting after natural curing to obtain a lower structure of the cold insulation module;(3) Compounding of the Upper structure of the cold insulation module and the lower structure of the cold insulation module'pressing-the upper structure of'the cold insulation module and the' lower.-structure of the cold insulation module together by means of a polyurethane fast curing adhesive so as to obtain the cold insulation module for ultra-low-temperature LNG storage and transportation.'7. The-preparation.method of the cdld insulatidh'ffioduie for ultra-lOw-temperature LNG' storage and transportation of claim 6, wherein in steps (1) arid (3), the polyurethane fast curing adhesive is prepared by mixing a polyester polyol, a diphenylmethane diisocyanate and a dimethylcyclohexylamine in a mass ratio of (1-10):(1-10):0.1.

8. The preparation method of the cold insulation-module for ultra-low-temperature LNG' storage and transportation of claim 6, wherein in step (1), an equipment for the mixingis an constant-pressure high-speed mixing head, with a rate of 1000-3000 r / min, a temperature of 10-40 C. and a discharge volume of 50-100 kg / min: the conveyor chain plate has a temperature of 15-45°C and a forward speed of 1-2 m / min; a time for the natural curing is. 60-120 days;, an equipment for the pressing together is a press with a temperature of 15^45 °C, a pressure of 0.5-2.0 bar and a time of 10-30 min.

9. The preparation method of the cold insulation module for ultra-low-temperature LNG storage and transportation of claim 6, wherein in step (2),. an equipment for the compounding by hot-pressing, is a'hot-pressing hydraulic press, with, a temperature of' 100-200°C, a pressure of 1-5 bar, and a time of 5-15 min; an equipment for the mixing.' is a high-pressure mixing head, with a pressure of 50-300 bar, a temperature of 15-35°C and a discharge volume of 20-120 kg / min; the high strength chain plate has a thickness of 5-25 mm, a flatness of ±0.5-1 mm. a temperature of 15-45°C, and a forward speed of 0.5-2.5 m / min; an apparent density of the kraft paper is 90-250 g / m2; and a time for the' natural curing is 60-120 days.

10. The preparation method of the cold insulation module for ultra-low-temperature LNG storage and transportation of claim 6. wherein in step (3), an equipment for the pressing'together is a press, with a temperature of 15-45°C, a pressure of 0.5-2.0 bar, and a time of 10-30 min.

Images