Radiation grafted polypropylene high thermal insulation foam material and method for preparing the same

Abstract

The application provides a kind of irradiation grafting polypropylene high heat insulation foamed material and its preparation method, belongs to polypropylene foamed material technical field. Through irradiation grafting process, polypropylene is modified and treated, ester group is introduced on polypropylene, and then supercritical intermittent foaming is carried out by using nanoscale hollow molecular sieve as nucleating agent, and polypropylene foamed material with high porosity micro-nano pore structure of ester group is obtained. Among them, ester group has the effect of absorbing infrared radiation energy, the introduction of ester group makes the radiation absorption coefficient of polypropylene foamed material greatly improve, the micro-nano pore structure formed in the foaming process makes the whole polypropylene foamed material solid volume ratio is far less than air volume ratio, and the micro-nano pore reduces the heat transfer efficiency of air thermal convection by enhancing Knudsen effect, thereby greatly reducing the thermal conductivity of foamed material. The foamed material prepared by the application has excellent heat insulation performance, solves the problem of poor heat insulation performance of traditional foamed material and narrow substrate selection.

Description

Technical Field

[0001] This invention relates to the field of polypropylene foam materials technology, specifically to an irradiated grafted polypropylene high thermal insulation foam material and its preparation method. Background Technology

[0002] Foamed plastics are formed by dispersing numerous gas micropores within solid plastics. They possess lightweight, heat-insulating, and shock-absorbing properties, and are widely used in construction, furniture, automobiles, aerospace, and many other fields. The market demand for polymer foamed materials is growing at a rate exceeding 10% annually. China's polymer foaming industry has also developed rapidly since the 1990s, mainly divided into three categories: polystyrene (PS), polyurethane (PU), and polyolefins (such as polyethylene PE, polypropylene PP, and polyvinyl chloride PVC). However, polystyrene (PS) foamed plastic products are difficult to degrade and recycle, causing "white pollution" to the environment. The United Nations environmental organization decided to stop the production and use of expanded polystyrene globally in 2005. Polyurethane (PU) foamed materials leave behind isocyanates that are harmful to human health during the foaming process and cannot be recycled. In recent years, with increasing environmental awareness, people have been constantly exploring new environmentally friendly materials. Continuously developing new environmentally friendly materials and optimizing the production processes of existing materials to improve the performance of foamed plastics, reduce their environmental impact, and promote the industry towards green and sustainable development presents a new challenge.

[0003] Polypropylene (PP), as a recyclable foaming material, has significant advantages over other foaming materials such as PU, PS, and PE, including higher service temperature, higher impact strength, environmental friendliness, and lower cost, making it popular among scholars both domestically and internationally. Meanwhile, supercritical carbon dioxide (CO2), as a non-toxic and pollution-free environmentally friendly physical foaming agent, has also attracted widespread attention from researchers and industry in the preparation of polymer foaming materials.

[0004] Polypropylene foam, as an ideal environmentally friendly thermal insulation material, suffers from similar characteristics to polystyrene. It exhibits very poor absorption of electromagnetic waves in the infrared radiation band, resulting in significant radiative heat transfer and severely reducing its thermal insulation performance. Furthermore, foamed materials produced using supercritical CO2 foaming technology suffer from problems such as uneven cell structure, large pore size, and low pore density, which will greatly limit their application as thermal insulation materials. Summary of the Invention

[0005] In view of the technical problems existing in the background art, this application provides an irradiated grafted polypropylene high thermal insulation foam material and its preparation method, aiming to solve the problem of poor thermal insulation performance of existing polypropylene foam materials.

[0006] In a first aspect, embodiments of this application provide a method for preparing an irradiated grafted polypropylene high thermal insulation foam material, comprising the following steps:

[0007] S1. Dissolve polypropylene and methyl acrylate in a solvent and mix them evenly to obtain a mixture; after irradiating, washing and drying the mixture, grafted polypropylene is obtained.

[0008] S2. Polypropylene, the grafted polypropylene, antioxidant and nano-sized hollow molecular sieve are mixed evenly and granulated to obtain mixed plastic particles.

[0009] S3. The mixed plastic particles are hot-pressed and cut to obtain sample sheets;

[0010] S4. Place the sample sheet in a reaction vessel, fill it with CO2 to the set pressure, heat the vessel to the foaming temperature, allow it to foam fully, and finally release the CO2 gas and depressurize to obtain a high-insulation polypropylene foam material.

[0011] In the technical solution of this application embodiment, polypropylene is modified by irradiation grafting to introduce ester groups onto the polypropylene. Then, supercritical intermittent foaming is performed using nanoscale hollow molecular sieves as nucleating agents to obtain a polypropylene foam material with a high porosity micro / nanoporous structure containing ester groups. The ester groups absorb infrared radiation energy, and their introduction significantly increases the radiation absorption coefficient of the polypropylene foam material. The micro / nanoporous structure formed during the foaming process results in a solid volume ratio that is much smaller than the air volume ratio in the entire polypropylene foam material. Furthermore, the micro / nanopores enhance the Knudsen effect, reducing the heat transfer efficiency of air convection, thereby greatly reducing the thermal conductivity of the foam material.

[0012] In some embodiments, the amount of nanoscale hollow molecular sieve added in step S2 is 1 to 2% of the total mass of polypropylene and the grafted polypropylene.

[0013] In this embodiment, by adding nanoscale hollow molecular sieves to the polypropylene foam material, the modified polypropylene material simultaneously forms a micro-nano porous structure during the foaming process.

[0014] In some embodiments, the mass of methyl acrylate in step S1 accounts for 10-15% of the mass of polypropylene, the solvent is anhydrous ethanol, the irradiation is electron beam irradiation, and the irradiation dose is 20-30 kGy.

[0015] In this embodiment, ester groups were introduced onto polypropylene by electron beam irradiation grafting modification of polypropylene and methyl acrylate.

[0016] In some embodiments, the mass ratio of the polypropylene and the grafted polypropylene in step S2 is 8.5–9:1.5–1.

[0017] In some embodiments, the antioxidant is one or a combination of several of the following: hindered phenolic antioxidants, thiohedral hindered phenolic antioxidants, phosphite antioxidants, and amine antioxidants, and the amount of the antioxidant added is 1 to 2% of the total mass of the polypropylene and the grafted polypropylene.

[0018] In this embodiment, by adding an antioxidant to the polypropylene foam material, the aging of the polymer is prevented and its service life is extended.

[0019] In some embodiments, the temperature of the hot pressing in step S3 is 160–170°C.

[0020] In this embodiment, a sample sheet with a thickness of 2mm and a diameter of 3cm is obtained by hot pressing and cutting.

[0021] In some embodiments, the set pressure in step S4 is 20-25 MPa, the foaming temperature is 165-175°C, and the foaming time is 2-2.5 h.

[0022] In this embodiment, by controlling the foaming pressure, temperature, time and other conditions, the polypropylene is fully foamed and the microporous structure formed by the foaming is stabilized.

[0023] Secondly, this application provides an irradiated grafted polypropylene high thermal insulation foam material, which is prepared by the above-mentioned method for preparing irradiated grafted polypropylene high thermal insulation foam material. It has a high porosity micro-nano pore structure with ester groups, and the thermal conductivity of the irradiated grafted polypropylene high thermal insulation foam material is 29.3 mW / m·k.

[0024] In the technical solution of this application embodiment, the obtained irradiated grafted polypropylene high thermal insulation foam material has an ultra-low thermal conductivity, which makes the irradiated grafted polypropylene high thermal insulation foam material have excellent thermal insulation performance.

[0025] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0026] To more clearly illustrate the technical solutions of this application, the accompanying drawings used in this application will be briefly described below. Obviously, the drawings described below are merely some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without any creative effort.

[0027] Figure 1This is a flowchart illustrating the preparation process of the irradiated grafted polypropylene high thermal insulation foam material according to an embodiment of this application.

[0028] Figure 2 This is a diagram illustrating the thermal insulation mechanism of the micro-nano pore structure in the irradiated grafted polypropylene high thermal insulation foam material according to embodiments of this application;

[0029] Figure 3 Infrared images of the grafted polypropylene powder prepared in Example 1 of this application and conventional ungrafted polypropylene powder;

[0030] Figure 4 SEM images of the grafted polypropylene powder prepared in Example 1 of this application and conventional ungrafted polypropylene powder;

[0031] Figure 5 This is a comparison chart of the thermal conductivity of the foamed materials prepared in Example 1 and Comparative Example 1 of this application;

[0032] Figure 6 This is a comparison diagram of the temperature states of the foamed materials prepared in Example 1 and Comparative Example 1 of this application. Detailed Implementation

[0033] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0034] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0035] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0036] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0037] To address the poor thermal insulation performance of existing polypropylene foam materials, this application provides an irradiated grafted polypropylene high-insulation foam material and its preparation method. Specifically, this application discovers that ester groups have the function of absorbing infrared radiation energy; introducing ester groups into the foam material can reduce the thermal conductivity by decreasing the material's radiative heat transfer efficiency. Therefore, this application introduces ester groups onto polypropylene using irradiation grafting technology. Furthermore, this application adds nanoscale hollow molecular sieves as nucleating agents during the supercritical intermittent foaming process, enabling the modified polypropylene material to simultaneously form a micro-nanoporous structure during foaming. This results in a polypropylene foam material with a high-porosity micro-nanoporous structure containing ester groups. This method significantly reduces the thermal conductivity of conventional polypropylene foam materials and greatly improves their thermal insulation performance.

[0038] On the one hand, embodiments of this application provide a method for preparing an irradiated grafted polypropylene high thermal insulation foam material, the process flow diagram of which is shown below. Figure 1 As shown, it includes the following steps:

[0039] S1. Dissolve polypropylene and methyl acrylate in a solvent and mix them evenly to obtain a mixture; after irradiating, washing and drying the mixture, grafted polypropylene is obtained.

[0040] S2. Polypropylene, the grafted polypropylene, antioxidant and nano-sized hollow molecular sieve are mixed evenly and granulated to obtain mixed plastic particles.

[0041] S3. The mixed plastic particles are hot-pressed and cut to obtain sample sheets;

[0042] S4. Place the sample sheet in a reaction vessel, fill it with CO2 to the set pressure, heat the vessel to the foaming temperature, allow it to foam fully, and finally release the CO2 gas and depressurize to obtain a high-insulation polypropylene foam material.

[0043] In the technical solution of this application embodiment, polypropylene is modified by irradiation grafting to introduce ester groups onto the polypropylene. Then, supercritical intermittent foaming is performed using nanoscale hollow molecular sieves as nucleating agents to obtain a polypropylene foam material with a high porosity micro / nanoporous structure containing ester groups. The ester groups absorb infrared radiation energy, and their introduction significantly increases the radiation absorption coefficient of the polypropylene foam material. The micro / nanoporous structure formed during foaming results in a solid volume ratio that is much smaller than the air volume ratio in the entire polypropylene foam material. Furthermore, the micro / nanopores reduce the heat transfer efficiency of air convection by enhancing the Knudsen effect. The thermal insulation principle of the micro / nanoporous structure is as follows: Figure 2 As shown, this greatly reduces the thermal conductivity coefficient of the foamed material, thereby improving the material's thermal insulation performance.

[0044] Furthermore, in some embodiments, in step S1, the mass of methyl acrylate accounts for 10-15% of the mass of the polypropylene, the solvent is anhydrous ethanol, the irradiation is electron beam irradiation, and the irradiation dose is 20-30 kGy.

[0045] In the technical solution of this application embodiment, ester groups are introduced onto polypropylene by electron beam irradiation grafting modification of polypropylene and methyl acrylate.

[0046] Furthermore, in some embodiments, in step S2, the mass ratio of polypropylene to the grafted polypropylene is 8.5-9:1.5-1, and the amount of nanoscale hollow molecular sieve and antioxidant added is 1-2% of the total mass of polypropylene and the grafted polypropylene. The antioxidant is one or a combination of several of the following: hindered phenolic antioxidants, thiohedral hindered phenolic antioxidants, phosphite antioxidants, and amine antioxidants.

[0047] In the technical solution of this application embodiment, using nanoscale hollow molecular sieves as nucleating agents enables the foamed material to form a high-porosity micro-nano pore structure; adding antioxidants to polypropylene foamed material can prevent the aging of the foamed material and extend its service life.

[0048] Furthermore, in some embodiments, the hot pressing temperature in step S3 is 160–170°C.

[0049] In the technical solution of this application embodiment, a sample sheet with a thickness of 2mm and a diameter of 3cm can be obtained by hot pressing and cutting.

[0050] Furthermore, in some embodiments, the set pressure in step S4 is 20-25 MPa, the foaming temperature is 165-175°C, and the foaming time is 2-2.5 h.

[0051] In the technical solution of this application embodiment, by controlling the pressure, temperature, time, depressurization rate and other conditions of supercritical intermittent foaming, polypropylene is fully foamed and the microporous structure formed by foaming is stabilized.

[0052] Secondly, this application provides an irradiated grafted polypropylene high thermal insulation foam material, which is prepared by the above-mentioned method for preparing irradiated grafted polypropylene high thermal insulation foam material. It has a high porosity micro-nano pore structure with ester groups, and the thermal conductivity of the irradiated grafted polypropylene high thermal insulation foam material is 29.3 mW / m·k.

[0053] In the technical solution of this application embodiment, the obtained irradiated grafted polypropylene high thermal insulation foam material has an ultra-low thermal conductivity, which makes the irradiated grafted polypropylene high thermal insulation foam material have excellent thermal insulation performance.

[0054] The following are some specific embodiments. It should be noted that the embodiments described below are exemplary and are only used to explain this application, and should not be construed as limiting this application. Where specific techniques or conditions are not specified in the embodiments, they shall be performed in accordance with the techniques or conditions described in the literature in this field or according to the product instructions. Reagents or instruments whose manufacturers are not specified are all conventional products that can be obtained commercially.

[0055] Example 1

[0056] This embodiment provides a method for preparing an irradiated grafted polypropylene high thermal insulation foam material, the preparation flow chart of which is shown below. Figure 1 As shown, the specific steps include the following:

[0057] Weigh 50g of polypropylene powder and 5g of methyl acrylate, dissolve them in a beaker containing anhydrous ethanol, stir evenly with a high-speed stirrer, pour into a radiation tube, evacuate, and then irradiate with an electron beam to absorb 20kGy. Wash five times with anhydrous ethanol and dry to obtain grafted polypropylene powder. Next, weigh polypropylene powder and grafted polypropylene powder in a mass ratio of 9:1, where the polypropylene powder is the conventional ungrafted polypropylene powder. At the same time, add 2,6-di-tert-butyl-p-cresol and nano-sized hollow molecular sieves (particle size 50nm, hollow pore size 15nm), the amounts of which are equal to the amounts of polypropylene powder and grafted polypropylene powder. 1% of the total mass of polypropylene powder was mixed and then extruded and granulated using a twin-screw extruder to obtain mixed plastic particles. These particles were then hot-pressed into 2mm sheets at 165℃ on a flat vulcanizing molding machine. The sheets were then cut into 3cm diameter sample sheets using a laser cutter. The sample sheets were placed in a high-pressure reactor and the reactor was repeatedly purged with CO2 gas to remove air. CO2 was then introduced through a plunger metering pump until the pressure reached 25MPa. The reactor temperature was then raised to 170℃ and maintained at this temperature and pressure for 2 hours. Finally, the pressure was released to release the CO2 gas, and the foaming process yielded a polypropylene foam material with a high porosity micro-nano pore structure containing ester groups.

[0058] The infrared and SEM images of the grafted polypropylene powder and the ungrafted conventional polypropylene powder prepared in this embodiment are shown below. Figure 3 , Figure 4 As shown. By Figure 3 It can be seen that the method provided in this embodiment successfully introduced ester groups into polypropylene.

[0059] Comparative Example 1

[0060] This comparative example provides a method for preparing an irradiated grafted polypropylene high thermal insulation foam material. The difference from Example 1 is that the polypropylene is not grafted. Instead, conventional polypropylene powder is used to replace the grafted polypropylene powder in Example 1 in an equal amount. The other steps are roughly the same as in Example 1 and will not be repeated here.

[0061] To compare the thermal insulation performance of the foamed materials prepared in Example 1 and Comparative Example 1, the thermal conductivity of the foamed materials prepared in Example 1 and Comparative Example 1 was tested, and the results are as follows: Figure 5 As shown in the figure, the thermal conductivity of the foamed material prepared in Example 1 was 29.3 mW / m·K, which was significantly lower than that of the foamed material in Comparative Example 1. Furthermore, the combined contribution of solid and radiation thermal conductivity in Example 1 was approximately 3.0 mW / m·K, accounting for only 10% of the total thermal conductivity. Compared to Comparative Example 1, this significantly reduced both solid and radiation thermal conductivity, demonstrating that the ester groups introduced after grafting have the function of absorbing infrared radiation energy. The introduction of ester groups can greatly increase the radiation absorption coefficient of polypropylene foamed material, thereby significantly reducing both solid and radiation thermal conductivity.

[0062] The foamed materials prepared in Example 1 and Comparative Example 1 were placed in the same temperature environment, and their temperatures were tested. The results are as follows: Figure 6 As shown. By Figure 6 It can be seen that the foamed material prepared in Example 1 has better thermal insulation performance.

[0063] Comparative Example 2

[0064] This comparative example provides a method for preparing an irradiated grafted polypropylene high thermal insulation foam material. Compared with Example 1, the difference is that the nucleating agent is replaced by a nano-sized hollow molecular sieve with a conventional zeolite molecular sieve without a hollow structure (particle size of 30 nm). The other steps are roughly the same as in Example 1, and will not be repeated here.

[0065] The thermal conductivity of the foamed material prepared in this comparative example was tested and compared with that of the foamed material prepared in Example 1. The results are shown in Table 1.

[0066] Table 1. Types of nucleating agents and product performance in Example 1 and Comparative Example 2.

[0067]

[0068] As can be seen from Table 1, after replacing the nucleating agent with a normal molecular sieve without a hollow structure, the thermal conductivity of the resulting foamed material is significantly higher than that of the foamed material obtained in Example 1 using a hollow molecular sieve as the nucleating agent, meaning that the thermal insulation effect is significantly reduced.

[0069] Example 2 and Comparative Example 3

[0070] Example 2 and Comparative Example 3 respectively provide a method for preparing an irradiated grafted polypropylene high thermal insulation foam material. Compared with Example 1, the difference lies in changing the mass ratio of polypropylene powder to grafted polypropylene powder. Other steps are roughly the same as in Example 1 and will not be repeated here. The mass ratio of polypropylene powder to grafted polypropylene powder in Example 2 and Comparative Example 3 and the thermal conductivity test results of the prepared foam materials are shown in Table 2.

[0071] Table 2. Process parameters and product performance in Example 2 and Comparative Example 3.

[0072]

[0073] As can be seen from Table 2, with the increase of the content of grafted polypropylene powder, the thermal conductivity of the resulting foamed material gradually increases, that is, the heat insulation effect gradually decreases.

[0074] Examples 3-4 and Comparative Example 4

[0075] Examples 3-4 and Comparative Example 4 respectively provide a method for preparing irradiated grafted polypropylene high thermal insulation foam material. Compared with Example 1, the difference is that the pressure and temperature during supercritical carbon dioxide foaming are changed. Other steps are roughly the same as in Example 1, and will not be repeated here.

[0076] The foaming conditions in Examples 3-4 and Comparative Example 4 and the thermal conductivity test results of the foamed materials prepared therefrom are shown in Table 3.

[0077] Table 3. Process parameters and product performance in Examples 3-4 and Comparative Example 4.

[0078]

[0079] As can be seen from Table 3, the foamed material obtained with a foaming pressure of 25 MPa and a foaming temperature of 175℃ has the lowest thermal conductivity, that is, the best thermal insulation performance.

[0080] In summary, this application provides an irradiated grafted polypropylene high-insulation foam material and its preparation method, belonging to the technical field of polypropylene foam materials. Polypropylene is modified through an irradiation grafting process, introducing ester groups onto the polypropylene. Then, supercritical intermittent foaming is performed using nanoscale hollow molecular sieves as nucleating agents to obtain a polypropylene foam material with a high porosity micro-nanoporous structure containing ester groups. The ester groups absorb infrared radiation energy, and their introduction significantly increases the radiation absorption coefficient of the polypropylene foam material. The micro-nanoporous structure formed during the foaming process results in a solid volume ratio that is much smaller than the air volume ratio in the entire polypropylene foam material. Furthermore, the micro-nanopores enhance the Knudsen effect, reducing the heat transfer efficiency of air convection, thereby greatly reducing the thermal conductivity of the foam material. The foam material obtained in this application exhibits excellent thermal insulation performance, solving the problems of poor thermal insulation performance and narrow substrate selection in traditional foam materials.

[0081] It should be noted that this application is not limited to the above-described embodiments. The above embodiments are merely examples, and any embodiments with the same structure and effect as the technical concept within the scope of this application are included in the technical scope of this application. Furthermore, various modifications that can be conceived by those skilled in the art to the embodiments, and other ways of constructing by combining some of the constituent elements of the embodiments, without departing from the spirit of this application, are also included in the scope of this application.

Claims

1. A method for preparing an irradiated grafted polypropylene high thermal insulation foam material, characterized in that, Includes the following steps: S1. Polypropylene and methyl acrylate are dissolved in a solvent and mixed evenly to obtain a mixture; the mixture is then subjected to irradiation, washing, and drying to obtain grafted polypropylene; the mass of methyl acrylate accounts for 10-15% of the mass of the polypropylene. S2. Polypropylene, the grafted polypropylene, antioxidant, and nanoscale hollow molecular sieve are mixed evenly and granulated to obtain mixed plastic particles; the mass ratio of the polypropylene to the grafted polypropylene is 8.5~9:1.5~1; the amount of nanoscale hollow molecular sieve added is 1~2% of the total mass of polypropylene and the grafted polypropylene; the particle size of the nanoscale hollow molecular sieve is 50nm, and the hollow pore size is 15nm. S3. The mixed plastic particles are hot-pressed and cut to obtain sample sheets; S4. Place the sample sheet in the reaction vessel and fill it with... Once the set pressure is reached, the kettle temperature is then increased to the foaming temperature for full foaming, and finally released. The gas is depressurized to obtain a high-insulation polypropylene foam material. The set pressure is 25 MPa, and the foaming temperature is 170~175℃.

2. The method for preparing irradiated grafted polypropylene high thermal insulation foam material according to claim 1, characterized in that, In step S1, the solvent is anhydrous ethanol.

3. The method for preparing irradiated grafted polypropylene high thermal insulation foam material according to claim 1, characterized in that, The irradiation in step S1 is electron beam irradiation, and the irradiation dose is 20~30kGy.

4. The method for preparing the irradiated grafted polypropylene high thermal insulation foam material according to claim 1, characterized in that, The antioxidant mentioned in step S2 is one or a combination of several of hindered phenolic antioxidants, phosphite antioxidants, and amine antioxidants, and the amount of antioxidant added is 1 to 2% of the total mass of polypropylene and the grafted polypropylene.

5. The method for preparing irradiated grafted polypropylene high thermal insulation foam material according to claim 1, characterized in that, The hot pressing temperature in step S3 is 160~170℃.

6. The method for preparing the irradiated grafted polypropylene high thermal insulation foam material according to claim 1, characterized in that, In step S4, the foaming time is 2~2.5h.

7. A radiation-grafted polypropylene high-insulation foam material, characterized in that, It is prepared by the method for preparing irradiated grafted polypropylene high thermal insulation foam material according to any one of claims 1 to 6.

8. The irradiated grafted polypropylene high thermal insulation foam material according to claim 7, characterized in that, The irradiated grafted polypropylene high thermal insulation foam material has a high porosity micro-nano pore structure with ester groups, and the thermal conductivity of the irradiated grafted polypropylene high thermal insulation foam material is 29.3 mW / m·k.

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