Aerosol can filled with internally mixed two-component polyurethane foam sealant, its preparation method and device

Abstract

The present invention discloses an aerosol can internal mixing two-component polyurethane foam sealant, its preparation method and device, which includes a single-component polyurethane foam sealant component. The curing component includes a curing agent and a curing catalyst. After the single-component polyurethane foam sealant component is mixed with the curing component, the isocyanate group content is 2% - 10%. Due to the introduction of the curing component, after the curing component is mixed with the single-component polyurethane foam sealant component and extruded, the dependence of the foam on the environmental temperature and humidity during the curing process is greatly reduced, and it can also cure quickly under low temperature and low humidity, expanding the temperature and humidity range for the use of the glue. By introducing the curing component, the physical properties of the foam after mixing and curing have been significantly improved. It not only has high tensile bond strength and compressive strength; at the same time, the cell structure is fine, the closed-cell rate is high, and it has better heat insulation and waterproof properties; therefore, the present invention can be applied to fields with higher performance requirements, expanding the application fields.

Description

Technical Field

[0001] The present invention relates to the field of polyurethane foam sealants, and particularly to an aerosol-can-packed in-tank mixed two-component polyurethane foam sealant and its preparation method and device. Background Art

[0002] Single-component polyurethane foam sealant is a special polyurethane foam product filled in aerosol cans. It has been widely used in construction and various fields, and has excellent functions such as caulking, sealing, heat insulation, bonding, and sound insulation. Single-component polyurethane foam sealant is a single-packaged (canned) material that is convenient to carry, easy to use, and environmentally friendly and energy-saving. However, the existing single-component polyurethane foam sealant is a type of moisture-curing material. Since water vapor is used as the curing agent, it is easily affected by environmental temperature and humidity, and due to the limitations of water as the curing agent itself, the physical properties of the existing single-component polyurethane foam sealant are poor and vary greatly after being ejected and cured, and the curing speed is slow. Especially in harsh environmental conditions of low temperature and low humidity, the curing is even slower, seriously affecting the foam quality and subsequent construction.

[0003] At present, with the continuous improvement of people's requirements for the use performance and construction efficiency of existing polyurethane foam sealants and the continuous expansion of application fields, the existing single-component polyurethane foam sealants can no longer meet people's needs. In some fields, there is an urgent need for modified polyurethane foam sealants with high physical properties, which can cure quickly, can also cure at low temperature and low humidity, have good foam quality, and good construction processability. Summary of the Invention

[0004] The first object of the present invention is to provide an aerosol-can-packed in-tank mixed two-component polyurethane foam sealant, which includes a single-component polyurethane foam sealant component and a curing component simultaneously packed in a double-layer aerosol can. When in use, the single-component polyurethane foam sealant component and the curing component are mixed in the can, enabling it to cure quickly as expected, can also cure quickly at low temperature and low humidity, and the cured foam has good quality, good construction processability, and high physical properties.

[0005] The second object of the present invention is to provide a preparation device for the aerosol-can-packed in-tank mixed two-component polyurethane foam sealant, which is used in cooperation with the single-component polyurethane foam sealant component and the curing component through a specific preparation device.

[0006] The third object of the present invention is to provide a preparation method for the aerosol-can-packed in-tank mixed two-component polyurethane foam sealant, which includes operating the double-layer aerosol can to mix the single-component polyurethane foam sealant component and the curing component in the can, and spraying and using them through the double-layer aerosol can.

[0007] The above objects are achieved by the following technical solutions:

[0008] Existing one-component polyurethane foam sealants are greatly affected by the environment during the curing process, and the curing speed is slow. Especially under harsh environmental conditions of low temperature and low humidity, the curing speed is even slower, seriously affecting the foam quality and subsequent construction. Moreover, the physical properties of the cured foam cannot meet the requirements of people in some special fields for higher performance. Based on this, on the basis of maintaining the convenient construction advantages of existing one-component polyurethane foam sealants, the inventor modified them by adding specific curing components, so that the glue can be cured quickly without being affected by the environment or being slightly affected, with good construction processability, and the cured foam has good quality and high physical properties.

[0009] Among them, the weight ratio of the components of the one-component polyurethane foam sealant to the curing components is 85-98:2-15, and the isocyanate group content after mixing is 2%-10%.

[0010] The components of the one-component polyurethane foam sealant are existing components, and in addition to the components contained in the existing one-component polyurethane foam sealant, it also has an appropriate isocyanate group content; the curing components include a curing agent and a curing catalyst. The curing agent is used for chain extension and crosslinking, and the curing catalyst is used to adjust the curing speed to meet the requirements of environmental conditions and construction processes. The curing components can also include pigments, and the pigments are used to judge whether the components are mixed evenly.

[0011] At the same time, during the research process, the inventor found that when the isocyanate group content of the mixed glue solution is 2%-10%, the physical properties of the finally obtained foam will be better and can better meet the requirements of the construction process.

[0012] On this basis, the curing components include the following components in parts by weight: 97-99.5 parts of curing agent, 0-2.5 parts of curing catalyst. Among them, the curing agent includes one or more of water, small molecule polyols, small molecule polyamines, and small molecule polyolamines; the curing catalyst includes one or more of organometallic catalysts and organic tertiary amine catalysts. The curing components can also include the following components in parts by weight: 97-99.5 parts of curing agent, 0-2.5 parts of curing catalyst, and 0.5-3 parts of pigment.

[0013] Among them, the small molecule polyols are ethylene glycol, propylene glycol, butylene glycol, glycerol, etc., the small molecule polyamines are ethylenediamine, propylenediamine, butylenediamine, etc., and the small molecule polyolamines are diethanolamine, triethanolamine, etc.

[0014] The organometallic catalysts are dibutyltin dilaurate, stannous octoate, etc., and the organic tertiary amine catalysts are dimethylethanolamine, bis(dimethylaminoethyl) ether, pentamethyldiethylenetriamine, triethylenediamine, etc.

[0015] Correspondingly, the isocyanate group content in the one-component polyurethane foam sealant component is 10%-20%, and the one-component polyurethane foam sealant component includes the following components in parts by weight: 13-24 parts of polyether and / or polyester polyol, 11-34 parts of plasticizer and / or flame retardant, 1.5-2.5 parts of foam stabilizer, 0.3-0.5 parts of catalyst, 30-47 parts of polymethylene polyphenyl isocyanate, and 18-22 parts of foaming agent.

[0016] Among them, the polyether and / or polyester polyol is the commonly used polyether polyol and / or polyester polyol in one-component polyurethane foam sealant, such as one or more of polyether 310, polyether 305, polyether 210, polyether 204, polyester PS-2352, and PS-3152;

[0017] The plasticizer and / or flame retardant is the commonly used plasticizer and / or flame retardant in one-component polyurethane foam sealant, such as one or more of chlorinated paraffin, triethyl phosphate (TEP), tris(2-chloroethyl) phosphate (TCEP), tris(2-chloropropyl) phosphate (TCPP), and dimethyl methylphosphonate (DMMP);

[0018] The foam stabilizer is the commonly used silicone oil in one-component polyurethane foam sealant, such as one or more of Evonik's B-8871, Maiste AK-88759, AK-88905, Rongyao XH-1880, and XH-1830;

[0019] The catalyst is the commonly used 2,2'-dimethylaminoethylether (DMDEE) in one-component polyurethane foam sealant;

[0020] The polymethylene polyphenyl isocyanate (crude MDI) is one or more of the commonly used PM-2025, M20S, and 44V20 in one-component polyurethane foam sealant;

[0021] The foaming agent is a commonly used environmentally friendly foaming agent in one-component polyurethane foam sealant, such as one or more of dimethyl ether (DME), propane-butane, 1,1-dichloroethane (HFC-152a), and 1,3,3,3-tetrafluoropropene (HFO-1234ze).

[0022] Furthermore, based on the above polyurethane foam sealant, the inventor also designed a device for preparing the above polyurethane foam sealant. Specifically, the device includes an outer tank for loading the single-component polyurethane foam sealant component and an inner tank for loading the curing component. The inner tank is located inside the outer tank, and a push rod is arranged inside the inner tank. The push rod is used to release the curing component loaded inside the inner tank so that it can be mixed with the single-component polyurethane foam sealant component in the outer tank. Specifically, the upper end of the push rod is located inside the inner tank, and the lower end is located outside the outer tank. The upper end of the push rod can pass through the upper end of the inner tank and be located inside the outer tank through movement, so that the single-component polyurethane foam sealant component and the curing component are mixed. A spray outlet is arranged on the outer tank, and the mixed single-component polyurethane foam sealant component and curing component are sprayed out through the spray outlet.

[0023] In this device, the curing component is introduced. When in use, the inner tank containing the curing component is broken to release the curing component, and the curing component is mixed evenly with the single-component polyurethane foam sealant component and ejected within a preset time. The cured foam has a high tensile bond strength and compressive strength; the foam cells are fine, the closed-cell rate is higher, and it has better heat insulation and waterproof properties; the foam curing speed is fast and easy to control. By mixing the curing component and the single-component polyurethane foam sealant component in the tank through this structure, it not only maintains the advantage of the traditional single-component polyurethane foam sealant being convenient to use, but also greatly improves the physical properties and expands the application fields.

[0024] Furthermore, based on the above polyurethane foam sealant, there is also a method for preparing the above polyurethane foam sealant, including the following steps:

[0025] Step 1: Load the curing component into the inner tank;

[0026] Step 2: Load the single-component polyurethane foam sealant component into the outer tank;

[0027] Step 3: Push the push rod in the direction of the inside of the inner tank so that the upper end of the push rod is located inside the outer tank;

[0028] Step 4: Invert the tank body and shake the tank body to mix the single-component polyurethane foam sealant component and the curing component evenly;

[0029] Step 5: Eject it within a preset time.

[0030] Among them, the preset time in Step 5 is 5 minutes.

[0031] Step 2 includes mixing polyether and / or polyester polyol, plasticizer and / or flame retardant, foam stabilizer and catalyst according to the ratio and stirring evenly to obtain a combined polyether; filling the combined polyether and polymethylene polyphenyl isocyanate into the outer tank according to the ratio, sealing it, and then immediately filling a foaming agent into the outer tank to obtain the single-component polyurethane foam sealant component.

[0032] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0033] For the aerosol canning internal mixing two-component polyurethane foam sealant, its preparation method and device of the present invention, due to the introduction of a curing component, after the curing component is mixed with the single-component polyurethane foam sealant component and extruded, the dependence of the foam on the environmental temperature and humidity during the curing process is greatly reduced, and it can also cure quickly under low temperature and low humidity, expanding the temperature and humidity range for the use of the glue.

[0034] By introducing the curing component, the physical properties of the cured foam have been significantly improved. It not only has a high tensile bond strength and compressive strength; at the same time, the foam cells are fine and the closed-cell rate is high, having better heat insulation and waterproof properties; therefore, the present invention can be applied to fields with higher performance requirements, expanding the application fields.

[0035] At the same time, the curing speed of the present invention is significantly increased, the foam cutting time is significantly shortened, improving the construction processability. And when the glue liquid obtained after mixing is extruded, it can be shaped immediately upon extrusion, with little post-expansion, not easily squeezing and damaging doors and windows, easy to control the amount of glue applied, and saving materials.

[0036] Secondly, the present invention has a similar construction process and construction tools to the existing single-component polyurethane foam sealant, so the sealant of the present invention is convenient to carry and the construction is simple and fast. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] The drawings described herein are used to provide a further understanding of the embodiments of the present invention, form a part of this application, and do not limit the embodiments of the present invention. In the drawings:

[0038] Figure 1 It is a schematic structural diagram of the device in Embodiment 1

[0039] The reference numerals in the drawings and the corresponding component names:

[0040] 1 - inner tank, 2 - first valve, 3 - push rod, 4 - second valve, 5 - outer tank, 6 - valve stem. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0041] To make the objectives, technical solutions, and advantages of the present invention clearer and more understandable, the present invention will be further described in detail below in conjunction with the embodiments and the drawings. The illustrative embodiments of the present invention and their descriptions are only used to explain the present invention and do not limit the present invention.

[0042] In the description of the present invention, it should be understood that the orientation or positional relationships indicated by the terms "front", "rear", "left", "right", "upper", "lower", "vertical", "horizontal", "high", "low", "inner", "outer", etc. are based on the orientation or positional relationships shown in the drawings. These are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as limiting the protection scope of the present invention.

[0043] Example 1

[0044] An aerosol can, as Figure 1 shown, includes an outer can 5 for loading a single-component polyurethane foam sealant component and an inner can 1 for loading a curing component. The inner can 1 is located inside the outer can 5. A push rod 3 is arranged inside the inner can 1. The upper end of the push rod 3 is located inside the inner can 1, and the lower end is located outside the outer can 5.

[0045] The inner can 1 is arranged at the lower end inside the outer can 5. The lower end of the inner can is provided with a first opening, and a first valve 2 is arranged at the first opening. The push rod 3 is arranged on the first valve 2. The upper end of the outer can is provided with a second opening, and a second valve 4 is arranged at the second opening. A valve rod 6 is arranged on the second valve 4.

[0046] During preparation, the curing agent, curing catalyst and pigment of the curing component are mixed evenly and then filled into the inner can 1 of the aerosol can according to the measurement. Then the first valve 2 is installed in the first opening and sealed. The polyether and / or polyester polyol, plasticizer and / or flame retardant, foam stabilizer and catalyst are mixed and stirred evenly according to the measurement to obtain a combined polyether. The combined polyether and crude MDI are filled into the outer can according to the measurement. The second valve 4 is installed in the second opening and sealed. Then the blowing agent is filled into the outer can 5 according to the measurement from the valve rod 6 and shaken evenly. After reacting at room temperature for 24 hours, a single-component polyurethane foam sealant component is obtained, and at the same time, the finished product is obtained.

[0047] During use, hold the aerosol can body tightly by hand and strike the push rod 3 forcefully on a hard tabletop or ground so that the push rod 3 is flush with the upper edge of the first valve 2, and the upper end (i.e., the front end) of the push rod 3 fully breaks the inner can 1 so that the curing component in the inner can 1 can be completely released. Then invert the can body and shake the aerosol can up and down so that the single-component polyurethane foam sealant component and the curing component are fully mixed. Finally, it is ejected within a preset time. After curing, the finished foam is obtained. In this example, the preset time is 5 minutes.

[0048] Example 2

[0049] According to the content of each component in Table 1 for No. 1, 37.5 g of polyether 310, 7.5 g of polyether 210, 3 g of polyether 305, 14.25 g of chlorinated paraffin, 9 g of flame retardant TCPP, 3 g of foam stabilizer B8871, and 0.75 g of catalyst DMDEE were mixed evenly to prepare 75 g of combined polyether. 10.5 g of ethylene glycol, 0.15 g of triethylenediamine, and 0.22 g of pigment were mixed evenly to prepare the curing component. The curing component was added into the inner tank 1 of the aerosol can. 75 g of combined polyether and 94 g of polymethylene polyphenyl isocyanate (crude MDI) M20S were added into the outer tank 5 and the second valve 4 was sealed. Immediately, 15 g of dimethyl ether (DME) and 24 g of propane-butane (LPG) were charged from the valve stem 6 of the second valve 4. After shaking evenly, it was left at room temperature for 24 hours to obtain the single-component polyurethane foam sealant component, and at the same time, the finished product was obtained.

[0050] The finished product was extruded with a tubular plastic wrench and samples were prepared according to various performance requirements. The cuttable time was measured to be 14′10″, the foam compression strength after curing for 48 hours was 102 kPa, the closed-cell rate was 86%, and the tensile bond strength after curing for 7 days was 214 kPa. The obtained foam has good physical properties and good construction processability.

[0051] Example 3

[0052] The formula No. 2 in Table 1 is the same as the formula of the single-component polyurethane foam sealant component in Example 2, and the preparation is also the same. Only the curing component is not added to the inner tank 1, that is, it is the existing single-component polyurethane foam sealant formula.

[0053] The foam was extruded with a tubular plastic wrench and samples were prepared according to various performance requirements. After testing, the cuttable time was 95′35″, the foam compression strength after curing for 48 hours was 39 kPa, the closed-cell rate was 72%, and the tensile bond strength after curing for 7 days was 115 kPa.

[0054] It can be seen from the test data of Example 2 and Example 3 that after adding the curing component to the existing single-component polyurethane foam sealant formula, that is, after the aerosol can is filled with the mixed two-component polyurethane foam sealant and extruded, the foam curing speed is significantly accelerated, the cutting time is shortened, and the physical properties such as compression strength, tensile bond strength, and closed-cell rate are greatly improved.

[0055] Example 4

[0056] According to the formulation No. 3 in Table 1, 33 g of polyether 310, 7.5 g of polyether 210, 3 g of polyether 305, 23.25 g of chlorinated paraffin, 3 g of foam stabilizer B8871 and 0.75 g of catalyst DMDEE were mixed evenly to prepare 75 g of combined polyether. 11.25 g of ethylene glycol, 0.15 g of triethylenediamine and 0.22 g of pigment were mixed evenly to prepare the curing component, which was then added into the inner tank 1 and the first valve 2 was sealed. Then, 75 g of combined polyether and 94 g of polymethylene polyphenyl isocyanate (crude MDI) M20S were added into the outer tank 5 and the second valve 4 was sealed. Immediately, 15 g of dimethyl ether (DME) and 24 g of propane-butane (LPG) foaming agent were charged from the valve stem 6 of the second valve 4. After shaking evenly, it was left at room temperature for 24 hours to obtain the single-component polyurethane foam sealant component, and at the same time, the finished product was obtained.

[0057] The finished product was taken out with a tubular plastic wrench and samples were prepared according to various performance requirements. After testing, the cuttable time was 15′30″, the foam compression strength after curing for 48 hours was 91 kPa, the closed-cell rate was 84%, and the tensile bond strength after curing for 7 days was 183 kPa.

[0058] In the single-component polyurethane foam sealant component of this example, the plasticizer was all chlorinated paraffin, and the isocyanate group content was relatively high. Although the cutting time was short and the foam performance was good, the foam was prone to brittleness during the curing process at low temperature (0 °C), and the construction process performance was poor.

[0059] Compared with Example 3, the curing speed of the foam in this example was accelerated, and the construction process performance, compression strength and tensile bond strength were all better.

[0060] Example 5

[0061] Compared with Example 2, the single-component polyurethane foam sealant component in this example was the same. The curing component was composed of 15 g of ethylene glycol, 0.15 g of triethylenediamine and 0.22 g of pigment mixed evenly, and the dosages of other raw materials were the same, and the preparation process was also the same.

[0062] The finished product was taken out with a tubular plastic wrench and samples were prepared according to various performance requirements. After testing, the cuttable time was 13′50″, the foam compression strength after curing for 48 hours was 90 kPa, the closed-cell rate was 85%, and the tensile bond strength after curing for 7 days was 188 kPa.

[0063] Compared with Example 2, although the curing speed of the foam in this example was accelerated and the construction process performance was also good, the compression strength and tensile bond strength decreased somewhat.

[0064] Compared with Example 3, the curing speed of the foam in this example was accelerated, and the construction process performance, compression strength and tensile bond strength were all better.

[0065] Example 6

[0066] Compared with Example 2, the single-component polyurethane foam sealant in this example has the same components. The curing component is made by mixing 6 g of ethylene glycol, 0.15 g of triethylenediamine, and 0.22 g of pigment evenly. The dosages of other raw materials are the same, and the preparation process is also the same.

[0067] The finished product is produced using a tubular plastic wrench, and samples are prepared according to various performance requirements. After testing, the cuttable time is 14'30", the foam compression strength after 48 hours of curing is 86 kPa, the closed-cell rate is 84%, and the tensile bond strength after 7 days of curing is 185 kPa.

[0068] Compared with Example 2, although the construction process performance in this example is also good, the curing speed of the foam is somewhat slower, and the compression strength and tensile bond strength are somewhat reduced.

[0069] Compared with Example 3, the curing speed of the foam in this example is accelerated, and the construction process performance, compression strength, and tensile bond strength are all better.

[0070] Example 7

[0071] Compared with Example 2, the single-component polyurethane foam sealant in this example has the same components. The curing component is made by mixing 3.15 g of water, 0.15 g of triethylenediamine, and 0.22 g of pigment evenly. The dosages of other raw materials are the same, and the preparation process is also the same.

[0072] After testing, during the mixing process of the single-component polyurethane foam sealant components and the curing components, heat is generated quickly and in large amounts, and it gels rapidly, resulting in can swelling or bursting, and it cannot be extruded.

[0073] Example 8

[0074] Compared with Example 2, the single-component polyurethane foam sealant in this example has the same components. The curing component is made by mixing 10.5 g of ethylene glycol and 0.22 g of pigment evenly. The dosages of other raw materials are the same, and the preparation process is also the same.

[0075] The finished product is produced using a tubular plastic wrench, and samples are prepared according to various performance requirements. After testing, the cuttable time is 35'15", the foam compression strength after 48 hours of curing is 69 kPa, the closed-cell rate is 80%, and the tensile bond strength after 7 days of curing is 169 kPa.

[0076] Compared with Examples 2, 4 - 7, although the construction process performance in this example is also good, the curing speed of the foam is somewhat slower, and the compression strength and tensile bond strength are somewhat reduced.

[0077] Compared with Example 3, the curing speed of the foam in this example is accelerated, and the construction process performance, compression strength, and tensile bond strength are all better.

[0078] Comparative Example 9

[0079] Examples 2 - 8 were prepared according to the ratios in Table 1 using the apparatus in Example 1 to obtain seven finished products, which were tested under standard conditions of temperature 23 ± 2°C and humidity 50 ± 5% to obtain Table 1.

[0080] Table 1

[0081]

[0082]

[0083] Among them, polyether 310, polyether 210, and polyether 305 are polyether polyols produced by Shandong Yinuowei New Materials Co., Ltd.; chlorinated paraffin is produced by Dongxiang Chemical Industry in Shenze County, Shijiazhuang; TCPP is a commercially available flame retardant (tris(2-chloropropyl) phosphate); B8871 is an organosilicon foam stabilizer produced by Evonik; DMDEE is a dimorpholine diethyl ether catalyst produced by Huamao Weiye; M20S is a polymethylene polyphenyl isocyanate (crude MDI) produced by BASF; dimethyl ether and propane-butane are ordinary commercially available aerosol foaming agents; ethylene glycol, triethylenediamine, and pigments are ordinary commercially available chemical raw materials; -NCO is isocyanate group.

[0084] According to Comparative Example 9, when the components of the one-component polyurethane foam sealant are determined, selecting the curing components within the component range of the present invention can obtain finished products with matching curing time, foam physical properties, and construction process properties;

[0085] When the curing components are determined, selecting the raw materials of the one-component polyurethane foam sealant components and the isocyanate group content within the component range of the present invention can also obtain finished products with curing time, suitable foam physical properties, and construction process properties meeting the requirements;

[0086] The isocyanate group content of the mixed glue is an important factor in obtaining foams with higher physical properties and better construction process properties. The inventors found during the research that when the isocyanate group content of the mixed glue is 2 - 10%, the obtained finished product foam has the best performance. At the same time, during the specific use process, the isocyanate group content of the mixed glue can be adjusted according to needs to obtain finished products that meet different requirements. The isocyanate group content of the mixed glue can be adjusted by adjusting the content or ratio of the one-component polyurethane foam sealant components and the curing components. And when the ratio of the one-component polyurethane foam sealant components and the curing components is within the range of the present invention, better physical properties and construction processability can be achieved.

[0087] Secondly, the aerosol can designed in the present invention containing an inner can and an outer can is an important factor in ensuring that the one-component polyurethane foam sealant components and the curing components can be stored for a long time and can be accurately mixed in a metered ratio during use.

[0088] In addition, the term "connected" used in this text, without special explanation, can be directly connected or indirectly connected via other components.

[0089] The specific embodiments described above further elaborate on the purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above are only specific embodiments of the present invention and are not used to limit the protection scope of the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An aerosol can - filled two - component polyurethane foam sealant, including a single - component polyurethane foam sealant component, characterized in that, The curing component includes a curing agent and a curing catalyst. After the single-component polyurethane foam sealant component is mixed with the curing component, the isocyanate group content is 2% - 10%; the curing component includes the following components in parts by weight: 97 - 99.5 parts of curing agent and 0 - 2.5 parts of curing catalyst; wherein, the curing agent is ethylene glycol, and the curing catalyst includes triethylenediamine; The single-component polyurethane foam sealant component includes the following components in parts by weight: 13 - 24 parts of polyether polyol, 11 - 34 parts of plasticizer and / or flame retardant, 1.5 - 2.5 parts of foam stabilizer, 0.3 - 0.5 parts of catalyst, 30 - 47 parts of polymethylene polyphenyl isocyanate, and 18 - 22 parts of foaming agent.

2. The aerosol can filled with a two-component polyurethane foam sealant as claimed in claim 1, characterized in that, The curing component further includes a pigment.

3. The two-component polyurethane foam sealant with in-can mixing according to claim 1, characterized in that, The weight ratio of the single-component polyurethane foam sealant component to the curing component is 85 - 98:2 - 15.

4. The preparation method of the aerosol can internal mixing two-component polyurethane foam sealant according to any one of claims 1-3, characterized in that, It is prepared by a sealant device, which includes an outer tank (5) for loading the single-component polyurethane foam sealant component and an inner tank (1) for loading the curing component. The inner tank (1) is located inside the outer tank (5). A push rod (3) is arranged inside the inner tank (1). The push rod (3) is used to release the curing component loaded inside the inner tank (1) so that it can be mixed with the single-component polyurethane foam sealant component inside the outer tank (5); The preparation method includes the following steps: Step 1: Load the curing component into the inner tank (1); Step 2: Load the single-component polyurethane foam sealant component into the outer tank (5); Step 3: Push the push rod (3) in the direction of the inside of the inner tank (1) so that the upper end of the push rod (3) is located inside the outer tank (5); Step 4: Invert the tank body and shake the tank body to mix the single-component polyurethane foam sealant component and the curing component evenly; Step 5: Spray it out within a preset time.

5. The method according to claim 4, wherein The preset time in Step 5 is 5 minutes.

6. The method according to claim 4, characterized in that Step 2 includes mixing and stirring evenly polyether polyol, plasticizer and / or flame retardant, foam stabilizer and catalyst to obtain a combined polyether; filling the combined polyether and polymethylene polyphenyl isocyanate into the outer tank (5) and sealing it, and filling the foaming agent into the outer tank (5) to obtain the single-component polyurethane foam sealant component.

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