A self-healing buffer material for the physical evidence of fire during logistics transportation and its preparation method

Abstract

The present invention belongs to the field of tracing the origin of fire evidence, and particularly relates to a self-healing buffer material for the logistics transportation of fire evidence and a preparation method thereof. Aiming at the problems in the prior art that the buffer materials for protecting fire evidence are easily damaged, non-flame-retardant, unable to self-close and seal the break, which may cause the confusion or loss of evidence, the present invention uses (4-vinylphenyl)dimethylsilane, 1-vinyl-3-butylimidazolium hexafluorophosphate ionic liquid and butadiene as raw materials, and in-situ polymerizes in the pores of melamine sponge. The polymerization of the above three raw materials is the main, and the self-polymerization of ionic liquid and butadiene is the auxiliary, to obtain a buffer material with flame-retardant and self-healing functions, reducing the possibility of the scattering and loss of fire evidence, while greatly increasing the number of times the buffer material can be recycled, and having low cost and being convenient for popularization and use, with good economic benefits.

Description

Technical Field

[0001] The present invention belongs to the field of tracing the origin of fire evidence, and particularly relates to a self-healing buffer material for the logistics transportation of fire evidence and a preparation method thereof. Background Art

[0002] After a fire case / event occurs, it is usually necessary to conduct physical evidence identification to confirm the cause of the fire, clarify the responsibilities of all parties, and summarize relevant experience and lessons. Different from criminal investigation cases where physical evidence is sent for inspection at the scene by two police officers holding police certificates, since there are few institutions with relevant appraisal qualifications in China, more than 90% of fire physical evidence is sent for inspection by express delivery / logistics mailing. However, due to the characteristics of fire physical evidence itself - such as combustion residues being fragile and prone to powdering; physical evidence such as metal wires and glass having sharp fracture surfaces; grass-roots investigators usually extracting a large number, large volume, and heavy weight of physical evidence, coupled with external forces during transportation and sorting - the overall chronological order of most fire physical evidence will be damaged during mailing (such as a burning lithium battery pack being damaged and scattered during mailing, making it difficult to trace the positional relationship between each other), and even the express delivery packaging box is damaged, resulting in the loss of tiny physical evidence such as molten beads.

[0003] Using buffer materials between the outer packaging box and fire physical evidence is the first choice to reduce the breakage probability of fire physical evidence during transportation. Existing buffer materials mainly include expanded polystyrene, expanded polyethylene, polyurethane sponge, expanded film, etc. However, the above buffer materials are not suitable for the transportation protection of fire physical evidence. This is mainly manifested in: firstly, the above buffer materials do not have flame retardancy. Some fire physical evidence, such as an incompletely discharged battery pack, combustion aid physical evidence, etc., has the risk of secondary accidents. At this time, the more buffer materials are added, the more combustibles there are, and the greater the risk; secondly, the above buffer materials do not have adhesiveness. On the one hand, they cannot better fix fire physical evidence, limit its movement in the packaging box to reduce the breakage probability, and on the other hand, they cannot adhere to damaged fire physical evidence to reduce the loss probability of tiny key physical evidence such as molten beads; thirdly, the above buffer materials do not have self-healing performance. Physical evidence such as glass with a sharp fracture surface, iron bridge wreckage, and wires, after piercing through the buffer material and being shaken out of the damaged area, the buffer material cannot self-close the break, which may cause physical evidence confusion or loss. At the same time, the damaged material cannot be self-healed and repaired, that is, the material cannot be recycled, resulting in a large amount of white pollution.

[0004] In view of this, it is necessary to develop a new generation of intrinsically safe buffer materials for the logistics transportation of fire physical evidence, greatly reduce the risk of secondary fire accidents and the probability of physical evidence damage, improve the traceability of physical evidence, reduce relevant judicial disputes, and at the same time increase the number of times the buffer material can be recycled, thereby reducing the comprehensive application cost. Summary of the Invention

[0005] To solve the problems existing in the above-mentioned prior art, the present invention provides a self-healing buffer material for the logistics transportation of fire physical evidence and a preparation method thereof.

[0006] The self-healing fire evidence physical distribution transportation buffer material described in the present invention mainly consists of melamine sponge, imidazole compounds containing C=C bonds, silane compounds containing C=C bonds and Si-H bonds, and olefin compounds containing at least two C=C bonds; among them, the imidazole compounds containing C=C bonds include 1-vinyl-3-butylimidazolium hexafluorophosphate ionic liquid, the silane compounds containing C=C bonds and Si-H bonds include (4-vinylphenyl)dimethylsilane, and the olefin compounds containing at least two C=C bonds include butadiene; the buffer material also contains a solvent and a photoinitiator, wherein the solvent includes dichloromethane, and the photoinitiator includes Irgacure-2959.

[0007] The dosage of each material in the buffer material is as follows: the molar ratio of (4-vinylphenyl)dimethylsilane, 1-vinyl-3-butylimidazolium hexafluorophosphate, and butadiene is (5-80):(10-90):(5-80); the mass of melamine sponge in the buffer material accounts for 65%-80%.

[0008] The preparation method of the self-healing fire evidence physical distribution transportation buffer material described in the present invention includes the following content:

[0009] Using melamine sponge as the base material, by dropping a quantitative reaction solution, the imidazole compounds containing C=C bonds, the silane compounds containing C=C bonds and Si-H bonds, and the olefin compounds containing at least two C=C bonds are in-situ polymerized in the pores of the melamine sponge to obtain a fire evidence physical distribution transportation buffer material with self-healing and flame-retardant functions.

[0010] The synergistic effect of the above ionic liquid containing a large amount of flame-retardant elements and the melamine sponge endows the new generation of fire evidence physical distribution transportation buffer material with inherent flame retardancy; at the same time, the polymerization of (4-vinylphenyl)dimethylsilane with butadiene and the ionic liquid is the main, and the self-polymerization of the above ionic liquid and the self-polymerization of butadiene are the auxiliary, endowing the new generation of fire evidence physical distribution transportation buffer material with the performance of self-sealing of the break and adhesiveness, not only improving the damping buffering performance of the buffer material for fire evidence, but also playing an adhesive preservation role for the shed fire evidence remains such as molten beads; after the buffer material is damaged, the strong hydrogen bond between the Si-H bond of (4-vinylphenyl)dimethylsilane and the imidazole matrix of the ionic liquid enables the break to automatically heal and repair the material.

[0011] The specific preparation method of the buffer material is as follows:

[0012] S1. Dissolve (4-vinylphenyl)dimethylsilane and 1-vinyl-3-butylimidazolium hexafluorophosphate in dichloromethane, add butadiene and a small amount of 2-hydroxy-4'-(2-hydroxyethoxy)-2-methylpropiophenone (photoinitiator Irgacure-2959), fully dissolve and mix evenly to obtain a reaction solution, and store it in an ice-water bath.

[0013] The dosages of each material in this step are as follows: the molar ratio of (4-vinylphenyl)dimethylsilane, 1-vinyl-3-butylimidazolium hexafluorophosphate, and butadiene is (5 - 80):(10 - 90):(5 - 80); the total mass of the above three materials accounts for 50% - 80% of the total mass of the reaction solution; the molar amount of the photoinitiator accounts for 1% - 5% of the total molar amount of the above three materials plus the photoinitiator.

[0014] S2. Drop the above reaction solution onto a melamine sponge. After the sponge fully absorbs the reaction solution, slowly heat the system to room temperature, irradiate it under an ultraviolet lamp for 5 min - 10 min for the first light polymerization; replace the backlit side with the light-facing side and perform the second light polymerization under the ultraviolet lamp for 5 min - 10 min; age it in an oven at 50°C - 100°C for 3 h - 8 h to obtain the self-healing fire evidence physical logistics transportation buffer material of the present invention.

[0015] Calculate the preparation of the melamine sponge and the reaction solution in the obtained buffer material by the weight gain method, where the melamine sponge accounts for 65% - 80% of the mass of the buffer material, and the reaction solution accounts for 20% - 35% of the mass of the buffer material.

[0016] The present invention has the following beneficial effects:

[0017] The present invention uses a commercially available melamine sponge as a carrier, and at room temperature, the 1-vinyl-3-butylimidazolium hexafluorophosphate ionic liquid, (4-vinylphenyl)dimethylsilane, and butadiene in the reaction solution are in-situ polymerized in the pores of the melamine sponge to obtain a fire evidence physical logistics transportation buffer material with self-healing and flame-retardant functions. This buffer material has excellent flame-retardant effects, is difficult to burn, self-extinguishes when removed from the fire, and does not drip, which can effectively prevent secondary accidents caused by fire evidence; it has good adhesion damping, which can not only greatly reduce the probability of movement and impact damage of fire evidence during transportation, but also play an adhesion and preservation role for the debris of falling fire evidence such as molten beads, effectively preventing the loss of key small evidence; after the buffer material is damaged, it can automatically repair the break, has the ability of self-healing at room temperature, reduces the possibility of fire evidence scattering and loss, and at the same time greatly increases the number of recycling times of this buffer material, and has low cost and is convenient for popularization and use, with good economic benefits. The above characteristics can greatly improve the safety and traceability of fire evidence during express / logistics transportation, and significantly reduce related judicial disputes. Brief Description of the Drawings

[0018] Figure 1 Schematic diagram of the preparation method of the buffer material described in the present invention;

[0019] Figure 2 SEM image of the buffer material prepared in Example 1;

[0020] Figure 3 Test chart of the 12h self-healing efficiency of the buffer material prepared in Example 3 at room temperature;

[0021] Figure 4 Heat release rate spectrum of the buffer material prepared in Example 4;

[0022] Figure 5 90° peel strength chart of the buffer material prepared in Example 4 on different material surfaces;

[0023] Figure 6 30-day weight gain rate chart of the buffer material prepared in Example 5;

[0024] Figure 7 90° peel strength chart of the buffer material prepared in Example 5 on different material surfaces;

[0025] Figure 8 Test chart of the 12h self-healing efficiency of the buffer material prepared in Comparative Example 6 at room temperature. Detailed implementation manners

[0026] The limiting oxygen index test of the present invention refers to the standard "GB / T 2406.2 - 2009", the UL-94 vertical burning test refers to the standard "GB / T 2408 - 2021", the maximum heat release rate test refers to the standard "ASTM D7309 - 21a", the 90° peel strength test refers to the standard "ASTM D429 - 14", and the maximum heat release rate is measured by a microcalorimeter.

[0027] The test method of the 30-day weight gain rate in the examples is as follows: Place the prepared buffer material in the indoor environment, weigh it daily, and the percentage of the increased weight after 30 days to the original weight is the 30-day weight gain rate. A stable 30-day weight gain rate indicates that the gel does not absorb moisture or dry out, characterizing the stability of the product.

[0028] The test method of the 12h self-healing efficiency in the examples is as follows: Take two identical samples from the prepared buffer material. One of them is used as the original sample to directly test its fracture stress, and the other is cut with a scalpel to make a 1 cm long and 1 cm deep incision on its surface. Then align it again, and after standing at room temperature for 12h without applying any external force, measure its fracture stress under the same conditions. The percentage of its fracture stress to the fracture stress of the original sample is the 12h self-healing efficiency. The fracture stress test refers to the standard "GB / T 1040.2 - 2022".

[0029] The test method for 50% deformation compression strength is as follows: the stress measured when a 5 cm thick sample is compressed to 50% of its original thickness using a universal testing machine.

[0030] The test method for the vertical drop experiment in the embodiment is as follows: Take a standard fire evidence sealing bag with a volume of 1 L, fill it with 100-mesh quartz sand with a volume of 80%, seal the opening, put the fire evidence sealing bag into a corrugated paper shipping box with a volume of 2 L, and fill the space between the evidence sealing bag and the shipping box with logistics transportation buffer material of the same mass as the quartz sand. Seal the corrugated paper shipping box and vertically release the shipping box from a height of 3 m to let it fall; Open the shipping box and inspect the sealing bag. If there is no damage, the vertical drop experiment passes; otherwise, it fails.

[0031] All melamine sponges sold on the market are applicable to the solution of the present invention. The embodiment takes a melamine sponge with a density of 5 kg / m 3 as an example. The butadiene raw material in the embodiment is stored in a high-pressure tank in a liquid state and becomes gaseous when the sample is taken out under normal pressure. The gaseous butadiene will dissolve in the solvent during use. The preparation method of the self-healing fire evidence logistics transportation buffer material described in the present invention is as Figure 1 shown.

[0032] The technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments and the drawings. It should be noted that the embodiments described in the present invention are only used for further explanation and illustration, rather than limiting the scope of its application. Based on the present invention, all other embodiments obtained by those skilled in the art without creative efforts belong to the protection scope of the present invention.

[0033] Example 1: The mass of the reaction solution accounts for 35% of the buffer material

[0034] S1. Take 0.91 g (0.0056 mol) of (4-vinylphenyl)dimethylsilane (CAS No.: 4556-72-3), 29.61 g (0.1 mol) of 1-vinyl-3-butylimidazolium hexafluorophosphate, dissolve them in dichloromethane, add 0.30 g (0.0056 mol) of butadiene, and add 1.32 g (0.0059 mol) of 2-hydroxy-4'-(2-hydroxyethoxy)-2-methylpropiophenone (photoinitiator Irgacure-2959), fully dissolve and mix evenly to obtain a reaction solution, and store it in an ice-water bath; (4-vinylphenyl)dimethylsilane, 1-vinyl-3-butylimidazolium hexafluorophosphate and butadiene account for 50% of the mass of the reaction solution.

[0035] S2. Take 65 g of melamine sponge, and evenly drip 35 g of the above reaction solution into it. After the sponge fully absorbs the reaction solution, slowly heat the system to room temperature, place it under a 650 W ultraviolet lamp for irradiation for 5 min for the first polymerization. After the surface is dried, replace the backlight side with the light-facing side, and perform secondary light irradiation polymerization under the ultraviolet lamp for 5 min. After aging in an oven at 50 °C for 3 h, the self-healing fire evidence physical logistics transportation buffer material of the present invention is obtained. The scanning electron micrograph of this buffer material is as shown in Figure 2 shown.

[0036] After testing, the limiting oxygen index of the prepared buffer material is 33.7%, the UL-94 vertical burning test reaches the V-0 grade, the maximum heat release rate is 105.6 W / g, the weight gain rate in 30 days is 2.7%, the 90° peel strength (iron) is 2.91 N, the self-healing efficiency at room temperature for 12 h is 36%, the 50% deformation compression strength is 0.98 MPa, and the vertical drop test: passed.

[0037] In Example 2, the mass of the reaction solution accounts for 20% of the buffer material.

[0038] S1. Dissolve 32.42 g (0.2 mol) of (4-vinylphenyl)dimethylsilane and 7.40 g (0.025 mol) of 1-vinyl-3-butylimidazolium hexafluorophosphate in dichloromethane, add 1.35 g (0.025 mol) of butadiene, and add 0.56 g (0.0025 mol) of 2-hydroxy-4'-(2-hydroxyethoxy)-2-methylpropiophenone (photoinitiator Irgacure-2959) and dissolve and mix well to obtain a reaction solution, and store it in an ice-water bath; (4-vinylphenyl)dimethylsilane, 1-vinyl-3-butylimidazolium hexafluorophosphate and butadiene account for 80% of the mass of the reaction solution.

[0039] S2. Take 80 g of melamine sponge, and evenly drip 20 g of the above reaction solution into it. After the sponge fully absorbs the reaction solution, slowly heat the system to room temperature, place it under a 650 W ultraviolet lamp for irradiation for 10 min for the first polymerization. Replace the backlight side with the light-facing side, and perform secondary light irradiation polymerization under the ultraviolet lamp for 10 min. After aging in an oven at 100 °C for 8 h, the self-healing fire evidence physical logistics transportation buffer material of the present invention is obtained.

[0040] After testing, the limiting oxygen index of the prepared buffer material is 33.7%, the UL-94 vertical burning test reaches the V-0 grade, the maximum heat release rate is 136.7 W / g, the weight gain rate in 30 days is 2.91%, the 90° peel strength (iron) is 0.79 N, the self-healing efficiency at room temperature for 12 h is 33%, the 50% deformation compression strength is 0.65 MPa, and the vertical drop test: passed.

[0041] In Example 3, the mass of the reaction solution accounts for 20% of the buffer material.

[0042] S1. Dissolve 10.21 g (0.063 mol) of (4-vinylphenyl)dimethylsilane, 56.26 g (0.19 mol) of 1-vinyl-3-butylimidazolium hexafluorophosphate in dichloromethane, add 54.05 g (1 mol) of butadiene, and add 5.83 g (0.026 mol) of 2-hydroxy-4'-(2-hydroxyethoxy)-2-methylpropiophenone (photoinitiator Irgacure-2959), and dissolve and mix well to obtain a reaction solution, which is stored in an ice-water bath; (4-vinylphenyl)dimethylsilane, 1-vinyl-3-butylimidazolium hexafluorophosphate and butadiene account for 58% of the mass of the reaction solution.

[0043] S2. Take 200 g of melamine sponge, evenly drop 50 g of the reaction solution into it. After the sponge fully absorbs the reaction solution, slowly heat the system to room temperature, irradiate it under a 650 W ultraviolet lamp for 9 min for the first polymerization; replace the backlight side with the light-facing side, and perform secondary light polymerization under the ultraviolet lamp for 7 min. After aging at 90 °C in an oven for 5 h, the self-healing fire evidence physical logistics transportation buffer material of the present invention is obtained.

[0044] After testing, the limiting oxygen index of the prepared buffer material is 32.7%, the UL-94 vertical burning test reaches the V-0 grade, the maximum heat release rate is 121.2 W / g, the weight gain rate in 30 days is 1.3%, the 90° peel strength (iron) is 1.38 N, and the self-healing efficiency at room temperature for 12 h is Figure 3 as shown in 50%, the 50% deformation compression strength is 0.87 MPa, and the vertical drop test: passed.

[0045] In Example 4, the mass of the reaction solution accounts for 30% of the buffer material

[0046] S1. Dissolve 16.21 g (0.1 mol) of (4-vinylphenyl)dimethylsilane, 88.83 g (0.3 mol) of 1-vinyl-3-butylimidazolium hexafluorophosphate in dichloromethane, add 32.43 g (0.6 mol) of butadiene, and add 6.95 g (0.031 mol) of 2-hydroxy-4'-(2-hydroxyethoxy)-2-methylpropiophenone (photoinitiator Irgacure-2959), and dissolve and mix well to obtain a reaction solution, which is stored in an ice-water bath; (4-vinylphenyl)dimethylsilane, 1-vinyl-3-butylimidazolium hexafluorophosphate and butadiene account for 68% of the mass of the reaction solution.

[0047] S2. Take 210 g of melamine sponge, evenly drop 90 g of the reaction solution into it. After the sponge fully absorbs the reaction solution, slowly heat the system to room temperature, place it under a 650 W ultraviolet lamp and irradiate for 8 min for the first polymerization; replace the backlight side with the light-facing side and perform secondary light polymerization under the ultraviolet lamp for 10 min; age it in an oven at 80 °C for 7 h to obtain the self-healing fire evidence physical logistics transportation buffer material of the present invention.

[0048] After testing, the limiting oxygen index of the prepared buffer material is 33.5%, the UL-94 vertical burning test reaches the V-0 grade, the maximum heat release rate is as Figure 4 shown as 113.7 W / g, the weight gain rate in 30 days is 1.8%, and the 90° peel strength on the iron surface is as Figure 5 shown as 1.52 N, the self-healing efficiency at room temperature for 12 h is 78%, the 50% deformation compression strength is 0.93 MPa, and the vertical drop test: Passed.

[0049] In Example 5, the mass of the reaction solution accounts for 30% of the buffer material.

[0050] S1. Dissolve 56.73 (0.35 mol) (4-vinylphenyl)dimethylsilane, 103.63 g (0.35 mol) 1-vinyl-3-butylimidazolium hexafluorophosphate in dichloromethane, add 16.22 g (0.3 mol) butadiene, and add 3.36 g (0.015 mol) 2-hydroxy-4'-(2-hydroxyethoxy)-2-methylpropiophenone (photoinitiator Irgacure-2959) and dissolve and mix well to obtain the reaction solution, and store it in an ice-water bath; (4-vinylphenyl)dimethylsilane, 1-vinyl-3-butylimidazolium hexafluorophosphate and butadiene account for 75% of the mass of the reaction solution.

[0051] S2. Take 210 g of melamine sponge, evenly drop 90 g of the reaction solution into it. After the sponge fully absorbs the reaction solution, slowly heat the system to room temperature, place it under a 650 W ultraviolet lamp and irradiate for 6 min for the first polymerization; replace the backlight side with the light-facing side and perform secondary light polymerization under the ultraviolet lamp for 6 min; age it in an oven at 60 °C for 5 h to obtain the self-healing fire evidence physical logistics transportation buffer material of the present invention.

[0052] After testing, the limiting oxygen index of the prepared buffer material is 38.1%, the UL-94 vertical burning test reaches the V-0 grade, the maximum heat release rate is 81.5 W / g, and the weight gain rate in 30 days is as Figure 6 shown as 0.1%, the 90° peel strength on the iron surface is as Figure 7 shown as 1.82 N, the self-healing efficiency at room temperature for 12 h is 92%, the 50% deformation compression strength is 1.17 MPa, and the vertical drop test: Passed.

[0053] Comparative Example 1

[0054] The test data of ordinary melamine sponge (commercially available) are as follows:

[0055] The limiting oxygen index is 35.8%, the UL-94 vertical burning test reaches V-0 grade, the maximum heat release rate is 92.2 W / g, the weight gain rate in 30 days is 0.3%, the 90° peel strength (iron) is 0, the self-healing efficiency at room temperature for 12 h is 0, the 50% deformation compression stress is 53 KPa, and the vertical drop test: failed.

[0056] Comparative Example 2

[0057] S1. Dissolve 56.73 g (0.35 mol) of (4-vinylphenyl)dimethylsilane and 104.34 g (0.35 mol) of 1-butyl-3-ethylimidazolium hexafluorophosphate (CAS: 256647-89-9) in dichloromethane, add 16.22 g (0.3 mol) of butadiene, and add 3.36 g (0.015 mol) of 2-hydroxy-4'-(2-hydroxyethoxy)-2-methylpropiophenone (photoinitiator Irgacure-2959), and dissolve and mix well to obtain a reaction solution, which is stored in an ice-water bath; (4-vinylphenyl)dimethylsilane, 1-butyl-3-ethylimidazolium hexafluorophosphate and butadiene account for 75% of the mass of the reaction solution.

[0058] S2. Take 210 g of melamine sponge, evenly drop 90 g of the reaction solution into it. After the sponge fully absorbs the reaction solution, slowly heat the system to room temperature, irradiate it under a 650 W ultraviolet lamp for 6 min for the first polymerization; replace the backlight side with the light-facing side and perform secondary light polymerization under the ultraviolet lamp for 6 min; age it in an oven at 60 °C for 5 h to obtain the self-healing fire evidence physical logistics transportation buffer material of the present invention.

[0059] After testing, the limiting oxygen index of the prepared buffer material is 31.2%, the UL-94 vertical burning test reaches V-0 grade, the maximum heat release rate is 167.7 W / g, the weight gain rate in 30 days is 21.7%, the 90° peel strength on the iron surface is 0.57 N, the self-healing efficiency at room temperature for 12 h is 10.6%, the 50% deformation compression strength is 0.39 MPa, and the vertical drop test: failed.

[0060] Comparative Example 3

[0061] S1. Dissolve 36.42 g (0.35 mol) of styrene, 103.63 g (0.35 mol) of 1-vinyl-3-butylimidazolium hexafluorophosphate in dichloromethane, add 16.22 g (0.3 mol) of butadiene, and add 3.36 g (0.015 mol) of 2-hydroxy-4'-(2-hydroxyethoxy)-2-methylpropiophenone (photoinitiator Irgacure-2959), and dissolve and mix well to obtain a reaction solution, which is stored in an ice-water bath; styrene, 1-vinyl-3-butylimidazolium hexafluorophosphate and butadiene account for 75% of the mass of the reaction solution.

[0062] S2. Take 210 g of melamine sponge, evenly drop 90 g of the reaction solution into it. After the sponge fully absorbs the reaction solution, slowly heat the system to room temperature, irradiate it under a 650 W ultraviolet lamp for 6 min for the first polymerization; replace the backlight side with the front light side and perform secondary light polymerization under the ultraviolet lamp for 6 min; age it in an oven at 60 °C for 5 h to obtain the self-healing fire evidence physical logistics transportation buffer material of the present invention.

[0063] After testing, the limiting oxygen index of the prepared buffer material is 28.5%, the UL-94 vertical burning test reaches V-1 grade, the maximum heat release rate is 233.1 W / g, the weight gain rate in 30 days is 3.7%, the 90° peel strength on the iron surface is 0.31 N, the self-healing efficiency at room temperature for 12 h is 2.3%, the 50% deformation compression strength is 0.75 MPa, vertical drop test: failed.

[0064] Comparative Example 4

[0065] S1. Dissolve 61.64 g (0.35 mol) of trimethyl(4-vinylphenyl)silane (CAS: 1009-43-4), 103.63 g (0.35 mol) of 1-vinyl-3-butylimidazolium hexafluorophosphate in dichloromethane, add 16.22 g (0.3 mol) of butadiene, and add 3.36 g (0.015 mol) of 2-hydroxy-4'-(2-hydroxyethoxy)-2-methylpropiophenone (photoinitiator Irgacure-2959), and dissolve and mix well to obtain a reaction solution, which is stored in an ice-water bath; trimethyl(4-vinylphenyl)silane, 1-vinyl-3-butylimidazolium hexafluorophosphate and butadiene account for 75% of the mass of the reaction solution.

[0066] S2. Take 210 g of melamine sponge, evenly drop 90 g of the reaction solution into it. After the sponge fully absorbs the reaction solution, slowly heat the system to room temperature, place it under a 650 W ultraviolet lamp and irradiate for 6 min for the first polymerization; replace the backlight side with the light-facing side and conduct secondary light irradiation polymerization under the ultraviolet lamp for 6 min; age at 60 °C in an oven for 5 h to obtain the self-healing fire evidence physical logistics transportation buffer material of the present invention.

[0067] After testing, the limiting oxygen index of the prepared buffer material is 30.7%, the UL-94 vertical burning test reaches the V-0 grade, the maximum heat release rate is 186.2 W / g, the weight gain rate in 30 days is 5.5%, the 90° peel strength on the iron surface is 0.35 N, the self-healing efficiency at room temperature for 12 h is 3.9%, the 50% deformation compression strength is 0.63 MPa, and the vertical drop test: not passed.

[0068] Comparative Example 5

[0069] S1. Dissolve 78.43 g (0.35 mol) of trimethoxy(4-vinylphenyl)silane (CAS: 18001-13-3), 103.63 g (0.35 mol) of 1-vinyl-3-butylimidazolium hexafluorophosphate in dichloromethane, add 16.22 g (0.3 mol) of butadiene, and add 3.36 g (0.015 mol) of 2-hydroxy-4'-(2-hydroxyethoxy)-2-methylpropiophenone (photoinitiator Irgacure-2959) and dissolve and mix well to obtain the reaction solution, and store it in an ice-water bath; trimethoxy(4-vinylphenyl)silane, 1-vinyl-3-butylimidazolium hexafluorophosphate and butadiene account for 75% of the mass of the reaction solution.

[0070] S2. Take 210 g of melamine sponge, evenly drop 90 g of the reaction solution into it. After the sponge fully absorbs the reaction solution, slowly heat the system to room temperature, place it under a 650 W ultraviolet lamp and irradiate for 6 min for the first polymerization; replace the backlight side with the light-facing side and conduct secondary light irradiation polymerization under the ultraviolet lamp for 6 min; age at 60 °C in an oven for 5 h to obtain the self-healing fire evidence physical logistics transportation buffer material of the present invention.

[0071] After testing, the limiting oxygen index of the prepared buffer material is 29.1%, the UL-94 vertical burning test reaches the V-1 grade, the maximum heat release rate is 197.9 W / g, the weight gain rate in 30 days is 7.2%, the 90° peel strength on the iron surface is 0.66 N, the self-healing efficiency at room temperature for 12 h is 9.1%, the 50% deformation compression strength is 0.82 MPa, and the vertical drop test: not passed.

[0072] Comparative Example 6

[0073] S1. Dissolve 32.42 g (0.2 mol) of (4-vinylphenyl)dimethylsilane, 7.40 g (0.025 mol) of 1-vinyl-3-butylimidazolium hexafluorophosphate in dichloromethane, add 1.35 g (0.025 mol) of butadiene, and add 0.56 g (0.0025 mol) of 2-hydroxy-4'-(2-hydroxyethoxy)-2-methylpropiophenone (photoinitiator Irgacure-2959) and dissolve and mix well to obtain a reaction solution, which is stored in an ice-water bath; (4-vinylphenyl)dimethylsilane, 1-vinyl-3-butylimidazolium hexafluorophosphate and butadiene account for 80% of the mass of the reaction solution.

[0074] S2. Take 90 g of melamine sponge, evenly drop 10 g of the above reaction solution into it. After the sponge fully absorbs the reaction solution, slowly heat the system to room temperature, irradiate it under a 650 W ultraviolet lamp for 10 min for the first polymerization; replace the backlight side with the front light side and conduct secondary light polymerization under the ultraviolet lamp for 10 min, and age it in an oven at 100 °C for 8 h to obtain the self-healing fire evidence physical logistics transportation buffer material of the present invention.

[0075] After testing, the limiting oxygen index of the prepared buffer material is 35.3%, the UL-94 vertical burning test reaches the V-0 grade, the maximum heat release rate is 97.1 W / g, the weight gain rate in 30 days is 0.3%, the 90° peel strength (iron) is 0.63 N, and the self-healing efficiency at room temperature for 12 h is Figure 8 shown as 20%, and the 50% deformation compression strength is 0.16 MPa. Vertical drop test: failed.

Claims

1. A self-healing fire evidence logistics transport buffer material, characterized in that: The raw materials of the buffer material are mainly composed of melamine sponge, imidazole compounds containing C=C bonds, silane compounds containing C=C bonds and Si-H bonds, and olefin compounds containing at least two C=C bonds; The imidazole compound containing a C=C bond includes 1-vinyl-3-butyl imidazole hexafluorophosphate ionic liquid, the silane compound containing a C=C bond and a Si-H bond includes (4-vinylphenyl) dimethylsilane, and the olefin compound containing at least two C=C bonds includes butadiene; the raw material of the buffer material also includes a solvent and a photoinitiator; The mass of melamine sponge accounts for 65% to 80% of the raw materials of the buffer material.

2. The self-healing fire evidence logistics transport buffer material according to claim 1, characterized in that: The amounts of the materials in the raw materials of the buffer material are as follows: the molar ratio of (4-vinylphenyl)dimethylsilane, 1-vinyl-3-butylimidazole hexafluorophosphate, and butadiene is (5-80): (10-90): (5-80).

3. The method for preparing the self-healing fire evidence logistics transport buffer material according to claim 1 or 2, characterized in that: The method comprises the following contents: taking melamine sponge as a substrate, adding a reaction liquid into the substrate, and polymerizing imidazole compounds containing C=C bonds, silane compounds containing C=C bonds and Si-H bonds, and olefin compounds containing at least two C=C bonds in the reaction liquid in situ in the melamine sponge to obtain a fire evidence logistics transportation buffer material with self-healing and flame retardant functions.

4. The method for preparing the self-healing fire evidence logistics transport buffer material according to claim 3, characterized in that: Includes the following: S1. (4-vinylphenyl)dimethylsilane and 1-vinyl-3-butylimidazole hexafluorophosphate are dissolved in a solvent, and butadiene and a photoinitiator are added to obtain a reaction solution; S2: adding the above reaction liquid to the melamine sponge, and after the sponge fully absorbs the reaction liquid, irradiating it under a UV lamp to perform a primary light polymerization; replacing the backlight side with the light-facing side, and performing a secondary light polymerization under a UV lamp; and obtaining the buffer material after heat preservation and aging.

5. The method for preparing the self-healing fire evidence logistics transport buffer material according to claim 4, characterized in that: The amounts of the materials in step S1 are as follows: the molar ratio of (4-vinylphenyl)dimethylsilane, 1-vinyl-3-butylimidazole hexafluorophosphate, and butadiene is (5-80): (10-90): (5-80); the total mass of the above three materials accounts for 50%-80% of the total mass of the reaction solution; the molar amount of the photoinitiator accounts for 1%-5% of the total molar amount of the above three materials plus the photoinitiator.

6. The method for preparing the self-healing fire evidence logistics transport buffer material according to claim 4, characterized in that: In step S2, the mass of the melamine sponge accounts for 65% to 80% of the total mass of the raw materials of the buffer material, and the mass of the reaction liquid accounts for 20% to 35% of the total mass of the raw materials of the buffer material.

7. The method for preparing the self-healing fire evidence logistics transport buffer material according to claim 4, characterized in that: In step S1, the solvent includes dichloromethane, and the photoinitiator includes Irgacure-2959.

8. The method for preparing the self-healing fire evidence logistics transport buffer material according to claim 4, characterized in that: In step S2, the time of the first light polymerization is 5 min to 10 min, and the time of the second light polymerization is 5 min to 10 min; and the temperature is kept at 50° C. to 100° C. for 3 h to 8 h.

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