Heat-insulating viscoelastic body as well as preparation method and application thereof

Abstract

The invention discloses a heat-insulating viscoelastic body as well as a preparation method and application thereof. The preparation method of the heat-insulating viscoelastic body comprises the following steps: dissolving polyisobutene in a solvent, and stirring at 80-90 DEG C for 1-2 hours; the preparation method comprises the following steps: by taking resin as a solvent, adding a heat-insulating filler and a reactive diluent, and stirring at 50-60 DEG C for 1- And mixing the products obtained in the two steps, and stirring at 80-90 DEG C for 2-3 hours to obtain the heat-insulating viscoelastic body. On the basis of an existing viscoelastic body preparation process, through formula optimization and process innovation, the heat insulation filler is introduced, and the structural integrity of the viscoelastic body is guaranteed, so that the prepared viscoelastic body has corrosion resistance and heat insulation performance. The invention can be used for the maintenance operation of pipelines or ancillary facilities which are easy to generate condensed water, and especially when the temperature of a flowing medium in the pipelines or ancillary facilities is-40-10 DEG C, the low-temperature construction performance and the heat insulation performance are good.

Description

Technical Field

[0001] This invention relates to the field of thermal insulation and corrosion protection technology for pipelines or ancillary facilities, and particularly to an insulating viscoelastic, its preparation method, and its application. Background Technology

[0002] Viscoelastics are high-performance polyolefin materials that combine the properties of both solid and liquid adhesives. They exhibit characteristics such as cold flow, non-curing, high viscosity, and water resistance. They have excellent adhesion to steel surfaces and can fully wet the pores of the metal surface, effectively preventing the penetration of moisture and corrosive media, thus forming a good protective layer. They are high-performance anti-corrosion materials, and their series of products have been applied in the corrosion control of steel structures on land, offshore platforms, and docks.

[0003] The glass transition (Tg) temperature of viscoelastic is generally around -50℃, which is much lower than the minimum curing temperature of general anti-corrosion primers. This gives it the possibility of low-temperature construction, especially when the temperature of the flowing medium in the pipeline or auxiliary facilities is -40 to -10℃. It can solve the problem that traditional anti-corrosion primers are difficult to cure at this temperature, thus affecting the anti-corrosion effect.

[0004] Although viscoelastic materials can be applied at low temperatures (>-50℃), conventional viscoelastic materials lack thermal insulation properties, resulting in condensation on their surface after application. This condensation can negatively impact subsequent coating processes and promote algae growth, leading to issues such as poor coating aesthetics, corrosion failure, and even personnel safety.

[0005] Therefore, based on the existing viscoelastic material formulation, a heat-insulating viscoelastic material is prepared through formulation optimization and process innovation. By utilizing the inherent low-temperature construction performance of viscoelastic materials, it is endowed with additional heat insulation properties, giving it both anti-corrosion and heat insulation functions. This provides a new approach for the maintenance of pipelines or auxiliary facilities in the chemical industry (such as LNG) that are prone to condensation, especially for maintenance operations with temperature. Summary of the Invention

[0006] In order to solve the above-mentioned technical problems, the present invention provides an insulating viscoelastic, its preparation method and application.

[0007] In a first aspect, the present invention provides a method for preparing an insulating viscoelastic material, which is achieved by the following technical solution.

[0008] A method for preparing a heat-insulating viscoelastic material includes the following steps: S1. Dissolve polyisobutylene in a solvent and stir at 80-90℃ for 1-2 hours; S2. Using resin as a solvent, add heat-insulating filler and reactive diluent, and stir at 50-60℃ for 1-2 hours; S3. After mixing the products obtained in steps S1 and S2, stir at 80-90℃ for 2-3 hours to obtain an insulating viscoelastic.

[0009] By adopting the above technical solution, the preparation process of the thermal insulation viscoelastic of the present invention is divided into three steps. Since the viscosity of polyisobutylene, the main raw material used in the viscoelastic, is too high, its viscosity can be reduced by dissolving it in a solvent, which is beneficial to the dispersion of subsequent thermal insulation fillers or other auxiliary materials. At the same time, compared with the conventional screw extrusion method for preparing viscoelastic, the three-step method can better avoid the damage to the thermal insulation filler caused by the screw extrusion method, thereby ensuring the thermal insulation performance of the viscoelastic.

[0010] Furthermore, in step S1, a mixture of C9 aromatic hydrocarbons (C9 mixture) is used as a solvent to dissolve polyisobutylene, and the mass fraction of the solvent is 5-15%.

[0011] Furthermore, in step S1, the polyisobutylene includes low molecular weight polyisobutylene (number average molecular weight of 200-10000) and medium molecular weight polyisobutylene (number average molecular weight of 20000-45000), with a mass ratio between 1 / 2 and 7 / 11.

[0012] Furthermore, in the specific preparation of step S1, low molecular weight polyisobutylene is added to the C9 aromatic mixture and stirred for 0.5-1 h at 80-90℃, followed by the addition of medium molecular weight polyisobutylene and stirring for 0.5-1 h.

[0013] Furthermore, in step S2, the resin is an epoxy resin or an organosilicon resin.

[0014] Furthermore, in step S2, the insulating filler is hollow glass microspheres or expanded vermiculite, and the amount of insulating filler added is 20-40% of the resin mass.

[0015] Furthermore, in step S2, the reactive diluent is a monoepoxy reactive diluent, and the amount of reactive diluent added is 10-15% of the resin mass.

[0016] Furthermore, in step S2, an active diluent is added to the resin at 50-60°C and stirred for 0-0.5 hours, followed by the addition of an insulating filler and stirring for 1-1.5 hours.

[0017] Furthermore, in step S3, the mass ratio of the product obtained in step S1 to the product obtained in step S2 is between 4 / 3 and 5 / 3.

[0018] Secondly, the present invention provides a heat-insulating viscoelastic body, which is achieved by the following technical solution.

[0019] An insulating viscoelastic material prepared by the above method is provided. This insulating viscoelastic material has a thermal conductivity of 0.07-0.12 W / (m·K), and can provide good thermal insulation performance.

[0020] Thirdly, the present invention provides an application of a heat-insulating viscoelastic material, which is achieved by the following technical solution.

[0021] This invention relates to the application of the aforementioned insulating viscoelastic in the maintenance of pipes or ancillary facilities (such as flanges and tees) prone to condensation. Especially when the temperature of the flowing medium within the pipes or ancillary facilities is between -40°C and 10°C, the insulating viscoelastic exhibits excellent low-temperature construction performance and thermal insulation properties. On the one hand, it solves the problem that traditional anti-corrosion primers are difficult to cure at these temperatures, thus affecting the anti-corrosion effect; on the other hand, it prevents the re-generation of condensation.

[0022] The heat-insulating viscoelastic material of this invention can be used in conjunction with conventional anti-corrosion intermediate paint and topcoat by wrapping it with non-woven fabric tape with adhesive backing, thereby improving the overall performance of the system.

[0023] Fourthly, the present invention provides a heat-insulating viscoelastic tape, which is achieved by the following technical solution.

[0024] A heat-insulating viscoelastic tape, comprising the aforementioned heat-insulating viscoelastic.

[0025] This application has the following beneficial effects: (1) Based on the existing viscoelastic material formulation, this invention prepares a heat-insulating viscoelastic by optimizing the formulation and innovating the process. By utilizing the inherent low-temperature construction performance of viscoelastic, it is endowed with additional heat insulation properties, so that it has both anti-corrosion and heat insulation functions. This provides a new approach for the maintenance of pipelines or auxiliary facilities in the chemical industry (such as LNG) that are prone to condensation, especially for maintenance operations with temperature.

[0026] (2) The heat-insulating viscoelastic material prepared by the present invention can be used in conjunction with conventional anti-corrosion intermediate paint and top paint by wrapping non-woven tape with adhesive backing, thereby improving the overall performance of the system. Attached Figure Description

[0027] Figure 1 This is a construction drawing of the thermally insulating viscoelastic material prepared in Embodiment 1 of the present invention on a certain terminal subsea pipeline onshore section; Figure 2 This is a construction drawing of a natural gas export pipeline section using the thermally insulating viscoelastic material prepared in Embodiment 2 of the present invention. Detailed Implementation

[0028] The present patent application will be further described below with reference to the embodiments. Unless otherwise specified, the experimental methods used in the following embodiments are conventional methods. Unless otherwise specified, the materials used in the preparation process in the following embodiments have not undergone further processing and have been commercially available.

[0029] The low molecular weight polyisobutylene used in the following embodiments of the present invention is derived from Aladdin, with a number average molecular weight of 2400; The medium molecular weight polyisobutylene used in the following embodiments of the present invention is derived from Aladdin, with a number average molecular weight of 30,000; The C9 aromatic hydrocarbon mixture used in the following embodiments of the present invention is sourced from Jining Juji, industrial grade, with an effective content ≥98%; The monoepoxy reactive diluent used in the following embodiments of the present invention is sourced from Senfida Chemical, industrial grade, with an effective content ≥95%; The hollow glass microspheres used in the following embodiments of the present invention are from Tiantai Precision Machinery Co., Ltd., with a particle size of 15-80 μm. The expanded vermiculite used in the following embodiments of the present invention is from Shijiazhuang Jinli Mining, with a particle size of 125-250 μm. Example 1

[0030] An insulating viscoelastic material, with its specific formulation, preparation process, and field application as follows: Formula: 30g of low molecular weight polyisobutylene (number average molecular weight 2400); 60g of medium molecular weight polyisobutylene (number average molecular weight 30000); 10g of C9 aromatic hydrocarbon mixture; 50g of epoxy resin (E51); 20g of hollow glass microspheres (particle size: 15-80um); 5g of monoepoxy reactive diluent.

[0031] Preparation process: (1) Add 10g of C9 aromatic hydrocarbon mixture to a beaker, add 30g of low molecular weight polyisobutylene at 90℃, stir for 0.5h, and after the low molecular weight polyisobutylene is completely dissolved, add 60g of medium molecular weight polyisobutylene and continue stirring for 1h for later use; (2) Take another beaker and add 50g of epoxy resin, add 5g of monoepoxy reactive diluent at 60℃, stir for 0.5h, then add 20g of hollow glass microspheres and continue stirring for 1h for later use; (3) Add the product obtained in step (2) to the product obtained in step (1), and continue stirring at 90℃ for 2h to discharge the material. The thermal conductivity of the prepared adiabatic viscoelastic is 0.01-0.12W / (m·K), and the thermal conductivity is determined according to standard GB / T 10294-2008.

[0032] Field application: (1) Apply the heat-insulating viscoelastic material prepared in this embodiment (approximately 3mm thick) manually to the surface of a natural gas pipeline (before pressure regulation, the internal medium temperature is 5-10℃), smooth it with a putty knife, and then wrap it tightly clockwise with non-woven fabric tape with adhesive backing. The overlap width of the non-woven fabric tape should not be less than 5% and not more than 20% of the width of the non-woven fabric tape; (2) Apply a conventional anti-corrosion intermediate paint of the specified film thickness to the surface of the non-woven fabric. After the intermediate paint dries, apply a conventional anti-corrosion topcoat of the specified film thickness. During operation, there is no condensation on the pipeline surface, indicating that the heat-insulating viscoelastic material prepared in this embodiment has a good heat preservation effect. Example 2

[0033] An insulating viscoelastic material, with its specific formulation, preparation process, and field application as follows: Formula: 35g of low molecular weight polyisobutylene (number average molecular weight 2400); 55g of medium molecular weight polyisobutylene (number average molecular weight 30000); 10g of C9 aromatic hydrocarbon mixture; 50g of silicone resin (MSE100); 20g of expanded vermiculite (particle size: 125-250um); 5g of monoepoxy reactive diluent.

[0034] Preparation process: (1) Add 10g of C9 aromatic hydrocarbon mixture to a beaker, add 35g of low molecular weight polyisobutylene at 80℃, stir for 1h, and after the low molecular weight polyisobutylene is completely dissolved, add 55g of medium molecular weight polyisobutylene and continue stirring for 1h; (2) Take another beaker and add 50g of organosilicon resin, add 5g of monoepoxy reactive diluent at 50℃, stir for 0.5h, then add 20g of expanded vermiculite and continue stirring for 1.5h; (3) Add the product obtained in step (2) to the product obtained in step (1), and continue stirring at 80℃ for 3h before discharging. The thermally insulating viscoelastic induction coefficient is 0.07-0.09W / (m·K).

[0035] Field application: (1) The heat-insulating viscoelastic material prepared in this embodiment was manually applied to the surface of a natural gas pipeline (before pressure regulation, the internal medium temperature was -40℃) with a surface treatment (the construction thickness was about 10mm), and smoothed with a putty knife. Then, non-woven fabric tape with adhesive backing was wrapped and tightened clockwise. The overlap width of the non-woven fabric tape was not less than 5% and not more than 20% of the width of the non-woven fabric tape; (2) Polyurea topcoat of a specified film thickness was applied to the surface of the non-woven fabric. During operation, there was no condensation on the pipeline surface, indicating that the heat-insulating viscoelastic material prepared in this embodiment had a good heat preservation effect.

[0036] The embodiments described herein are preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Therefore, all equivalent changes made in accordance with the structure, shape, and principle of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A method for the preparation of a thermally insulating viscoelastic body, characterized in that: The method comprises the following steps: S1. Dissolving polyisobutylene with solvent, stirring at 80-90℃ for 1-2h; S2. Adding heat-insulating filler and active diluent into resin as solvent, stirring at 50-60℃ for 1-2h; S3. Mixing the products from step S1 and step S2, stirring at 80-90℃ for 2-3h to obtain heat-insulating viscoelastic body.

2. A method of preparing a thermally insulating viscoelastic body according to claim 1, characterized in that: In step S1, carbon nine aromatic hydrocarbon mixture is used as solvent to dissolve polyisobutylene, and the mass fraction of solvent is 5-15%.

3. A method of preparing a thermally insulating viscoelastic body according to claim 1, characterized in that: In step S1, polyisobutylene comprises low molecular weight polyisobutylene and medium molecular weight polyisobutylene, the number average molecular weight of low molecular weight polyisobutylene is 200-10000, the number average molecular weight of medium molecular weight polyisobutylene is 20000-45000, and the mass ratio of low molecular weight polyisobutylene to medium molecular weight polyisobutylene is between 1 / 2 and 7 / 11.

4. A method of preparing a thermally insulating viscoelastic body according to claim 1, characterized in that: In step S2, the resin is epoxy resin or silicone resin.

5. A method of preparing a thermally insulating viscoelastic body according to claim 1, characterized in that: In step S2, the heat-insulating filler is hollow glass microsphere or expanded vermiculite, and the addition amount of heat-insulating filler is 20-40% of the mass of resin.

6. A method of preparing a thermally insulating viscoelastic body according to claim 1, characterized in that: In step S2, the active diluent is single epoxy group active diluent, and the addition amount of active diluent is 10-15% of the mass of resin.

7. A method of preparing a thermally insulating viscoelastic body according to claim 1, characterized in that: In step S3, the mass ratio of the product from step S1 to the product from step S2 is between 4 / 3 and 5 / 3.

8. Heat-insulating viscoelastic body prepared by the method of any one of claims 1-7.

9. Application of the heat-insulating viscoelastic body of claim 8 in maintenance operation of pipeline or auxiliary facilities prone to condensate water.

10. An adhesively viscoelastic body tape characterized by: The heat-insulating viscoelastic body of claim 8.

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