CN110551269A - Heat-resistant room-temperature rapid self-repairing elastomer and preparation method and application thereof - Google Patents
Heat-resistant room-temperature rapid self-repairing elastomer and preparation method and application thereof Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/30—Low-molecular-weight compounds
- C08G18/38—Low-molecular-weight compounds having heteroatoms other than oxygen
- C08G18/3855—Low-molecular-weight compounds having heteroatoms other than oxygen having sulfur
- C08G18/3863—Low-molecular-weight compounds having heteroatoms other than oxygen having sulfur containing groups having sulfur atoms between two carbon atoms, the sulfur atoms being directly linked to carbon atoms or other sulfur atoms
- C08G18/3865—Low-molecular-weight compounds having heteroatoms other than oxygen having sulfur containing groups having sulfur atoms between two carbon atoms, the sulfur atoms being directly linked to carbon atoms or other sulfur atoms containing groups having one sulfur atom between two carbon atoms
- C08G18/3868—Low-molecular-weight compounds having heteroatoms other than oxygen having sulfur containing groups having sulfur atoms between two carbon atoms, the sulfur atoms being directly linked to carbon atoms or other sulfur atoms containing groups having one sulfur atom between two carbon atoms the sulfur atom belonging to a sulfide group
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/40—High-molecular-weight compounds
- C08G18/61—Polysiloxanes
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/65—Low-molecular-weight compounds having active hydrogen with high-molecular-weight compounds having active hydrogen
- C08G18/6505—Low-molecular-weight compounds having active hydrogen with high-molecular-weight compounds having active hydrogen the low-molecular compounds being compounds of group C08G18/32 or polyamines of C08G18/38
- C08G18/6523—Compounds of group C08G18/3225 or C08G18/3271 or polyamines of C08G18/38
- C08G18/6529—Compounds of group C08G18/3225 or polyamines of C08G18/38
Abstract
the invention provides a heat-resistant room-temperature rapid self-repairing elastomer which is prepared from hydroxypropyl-terminated polydimethylsiloxane, isocyanate and a chain extender; wherein the chain extender is a diamino disulfide. The elastomer has room temperature self-repairing and heat-resistant performances, can quickly finish self-repairing at room temperature, has high repairing efficiency and good thermal stability, has the room temperature quick self-repairing function of a flexible heat-resistant material, can realize the maintenance-free characteristic of the material, effectively prolongs the service life, and fills the gap in the field. The elastomer has stable service performance, wide application range and long service life, can be applied to systems such as various elastomers, coating materials, encapsulating materials, adhesives and the like, is particularly applied to an outer protective coating and a flexible workpiece material which are used in a high-temperature environment or have heat-resistant and ablation-resistant requirements, such as an aircraft heat-resistant coating, and has the advantages of maintenance-free performance, high reliability and the like and wide application prospect.
Description
Technical Field
The invention belongs to the field of intelligent high polymer materials, and particularly relates to a heat-resistant room-temperature rapid self-repairing elastomer, and a preparation method and application thereof.
Background
The heat-proof material has irreplaceable key effects in the aerospace craft, the aerodynamic thermal environment is more and more severe along with the continuous improvement of the flight speed of the aerospace craft, and the effective outer heat-proof layer can provide enough protection for the aerospace craft when the aerospace craft is subjected to severe aerodynamic heating, so that the flight safety is ensured. However, the mere presence of a thermal protection layer, whose cracking is a significant risk and a fatal threat to the safety of an aerospace vehicle, is still an ineffectively avoidable risk, and therefore maintaining the structural integrity of the thermal protection layer is of paramount importance. At present, the heat-resistant coating with the flexible structure characteristic is more and more important, the flexible material is easier to generate microcracks due to the fact that the flexible material is subjected to mechanical actions such as static or dynamic stretching, extruding, shearing and twisting for a long time, the existence of the defects such as the cracks is a great potential safety hazard of the heat-proof structure, therefore, the flexible ablation heat-proof material is modified, the integrity of the structure can be maintained, the automatic crack healing function is achieved, the self-repairing function of the heat-proof material is endowed, the service life is prolonged, and the maintenance cost is reduced, so that the heat-proof material has very important significance.
The self-repairing material is a novel material capable of self-repairing when an object is damaged. The self-repairing purpose is to prevent the crack from continuing to expand in the initial stage of crack formation, or automatically close the crack after the material is damaged, and recover the initial structure and performance of the material, so that the application reliability of the material is improved, the application range is expanded, and the service life is prolonged. The room temperature self-repairing material has convenience and mild type of repairing conditions, so that the room temperature self-repairing material has important value in practical application, especially in the aspects of self-maintenance of protective materials and the like. If the self-repairing function of the heat-proof material is endowed through modification, the self-repairing function is automatically repaired when the material has cracks and local damage, so that the safety and the reliability of the aircraft are greatly improved, the service life is prolonged, and the development of the flexible heat-proof self-repairing material has important significance. However, most of the existing self-repairing materials are used in the fields with mild service temperature, such as artificial skin, sensors, medical materials, automobile coatings and the like, and the research on the field of heat-resistant materials is very few.
The current self-repairing materials are divided into an external self-repairing material and an intrinsic self-repairing material according to the repairing types. The externally-applied self-repairing material is characterized in that the self-repairing function is realized by introducing additional components such as microcapsules containing a repairing agent system, carbon nano tubes, micro vessels or glass fibers into a material matrix. The intrinsic self-repairing material does not need an additional repairing system, but the material contains special chemical bonds or other physical and chemical properties such as reversible covalent bonds, non-covalent bonds, molecular diffusion and the like to realize the self-repairing function. The method does not depend on a repairing agent, complex steps such as a repairing agent embedding technology in advance and the like are omitted, repeated repairing can be realized on the same damaged part for many times, the influence on the performance of a matrix is small, the design of the molecular structure of the material is the biggest challenge of the method, and the method becomes a research focus at present.
For example, Zhang et al (Self-healing overcoat polymers based on the multi-moisture bonding of low-molecular polydimethysiloxanes: Synthesis and characteristics [ J ]. Journal of Applied Polymer Science,2013,129(5):2435-2442.) prepared by mixing bis 3-aminopropyl terminated polydimethylsiloxane and 1,3, 5-tribenzoyl benzene in DMF yielded a Self-healing coating with reversible dynamic imine bonds with a room temperature 60min healing rate of up to 98.3%, but a tensile strength of only 0.03MPa, but with very low strength, failing to meet the requirements of the thermal overcoat for high strength and resistance to washing, scratching, etc.
also, for example, Zhao et al (A Self-Healing, Re-mobile and Biocompatible Crosslinked Polysiloxane Elastomer [ J ]. Journal of Materials Chemistry B,2016,4(5): 982-. The maleimide functionalized polydimethylsiloxane and the furan functionalized polydimethylsiloxane are subjected to cross-linking reaction to prepare the heating self-repairing polydimethylsiloxane elastomer. The tensile strength of the elastomer is about 0.65MPa, the elongation at break is only 50%, the elastomer is subjected to heat treatment at 140 ℃ for 3 hours, and the tensile strength self-repairing efficiency can reach 95% after the elastomer is subjected to heat treatment at 80 ℃ for 24 hours. The elastomer prepared by DA cycloaddition reaction generally has the defects of harsh self-repairing conditions and high temperature treatment requirement, and is not suitable for being used as a self-repairing coating of the surface of an aircraft. And the disulfide bond has the function of reversible double decomposition reaction at room temperature, and is beneficial to realizing the quick self-repairing of the coating at room temperature.
According to the existing literature search, no research report on the room temperature rapid self-repairing of the flexible heat-resistant material is reported.
Disclosure of Invention
The invention aims to provide a heat-resistant room-temperature rapid self-repairing elastomer, and a preparation method and application thereof.
The invention provides a heat-resistant room-temperature rapid self-repairing elastomer which is prepared from hydroxypropyl-terminated polydimethylsiloxane, isocyanate and a chain extender; wherein the molar ratio of the hydroxypropyl end-capped polydimethylsiloxane, the isocyanate and the chain extender is (1-10): 20-35): 10-25; the chain extender is an aliphatic or aromatic diamino disulfide containing reversible disulfide bonds.
Furthermore, the molar ratio of the hydroxypropyl-terminated polydimethylsiloxane, the isocyanate and the chain extender is 10 (21-31.5) to 10-20.
Further, the molar ratio of the hydroxypropyl-terminated polydimethylsiloxane, the isocyanate and the chain extender is 10:21: 10.
Further, the isocyanate is a diisocyanate, preferably isophorone diisocyanate, hexamethylene diisocyanate, 4' dicyclohexylmethane diisocyanate or diphenylmethane diisocyanate; and/or the chain extender is 4,4' -diaminodiphenyl disulfide.
the invention also provides a preparation method of the self-repairing elastomer, which comprises the following steps:
(1) synthesis of prepolymer: adding a catalytic amount of catalyst into hydroxypropyl-terminated polydimethylsiloxane and isocyanate, and reacting to obtain a prepolymer;
(2) Chain extension reaction: dissolving a chain extender in an organic solvent, adding the chain extender into the prepolymer, and reacting to obtain a reaction solution;
(3) And pouring the reaction solution into a mould, and curing to obtain the product.
Further, the air conditioner is provided with a fan,
In the step (1), the catalyst is dibutyltin dilaurate;
and/or, in the step (2), the organic solvent is dimethylacetamide or dimethylformamide.
further, the air conditioner is provided with a fan,
In the step (2), the method for adding the organic solvent containing the chain extender into the prepolymer is dropwise adding;
and/or, in the step (2), the reaction solution is prepared into a reaction solution with a polymer concentration of 30% by using dimethylacetamide or dimethylformamide for chain extension reaction.
Further, the air conditioner is provided with a fan,
In the step (1), argon is introduced into the mixture for stirring for 1 to 6 hours at the temperature of between 60 and 100 ℃;
and/or in the step (2), the reaction is carried out for 2-4h at the temperature of 20-60 ℃;
And/or in the step (3), the solidification is carried out at 90 ℃ for 12 hours under vacuum, and residual solvent is removed;
Preferably, in the step (1), the reaction is carried out at 80 ℃ by introducing argon and stirring for 3 h;
and/or in the step (2), the reaction is carried out at 40 ℃ for 3 h.
The invention also provides application of the self-repairing elastomer in preparation of the heat-resistant room-temperature self-repairing material.
further, the heat-resistant room temperature self-repairing material is an elastomer, a coating, a potting material or an adhesive; or the heat-resistant room temperature self-repairing material is an outer protective coating and a flexible workpiece material which are applied to a high-temperature environment or have heat-resistant and ablation-resistant requirements, and preferably, the heat-resistant room temperature self-repairing material is an outer coating of an aircraft.
The flexible heat-resistant material has the room-temperature self-repairing function, can realize the maintenance-free characteristic of the material, effectively prolongs the service life, and fills the gap in the field. The self-repairing elastomer has stable use performance, wide use range and long service life, can be applied to systems of various elastomers, coating materials, encapsulating materials, adhesives and the like, is particularly applied to high-temperature environments or outer protective coatings and flexible workpiece materials with heat-resistant and ablation-resistant requirements, such as aircraft heat-proof coatings, and has the advantages of maintenance-free performance, high reliability and the like and excellent application prospect.
obviously, many modifications, substitutions, and variations are possible in light of the above teachings of the invention, without departing from the basic technical spirit of the invention, as defined by the following claims.
The present invention will be described in further detail with reference to the following examples. This should not be understood as limiting the scope of the above-described subject matter of the present invention to the following examples. All the technologies realized based on the above contents of the present invention belong to the scope of the present invention.
Drawings
FIG. 1 is an infrared spectrum of each set of self-healing elastomers.
FIG. 2 is a Raman spectrum of each set of self-healing elastomers.
FIG. 3 is a tensile stress-strain curve of a self-repairing elastomer PDMS 3000 -APDS 10 of the present invention after self-repairing under different repairing conditions.
FIG. 4 is a tensile stress-strain curve of a self-repairing elastomer PDMS 3000 -APDS 20 of the present invention after self-repairing under different repairing conditions.
FIG. 5 is a thermal degradation thermogravimetric curve of each set of self-healing elastomers.
Fig. 6 is a thermal degradation DTG curve for each set of self-healing elastomers.
Detailed Description
the raw materials and equipment used in the embodiment of the present invention are known products and obtained by purchasing commercially available products.
PDMS in the present invention is an abbreviation for polydimethylsiloxane.
Example 1 preparation of a self-healing elastomer of the invention
(1) And (3) synthesizing a prepolymer, namely pouring 10mmol of hydroxypropyl-terminated polydimethylsiloxane (HO-PDMS 3000, the average molecular weight is 3000, the molecular weight range is 2000-4000) and 21mmol of isophorone diisocyanate (IPDI) into a flask, adding 3000ppm of catalyst dibutyltin dilaurate (DBTDL), introducing argon at 80 ℃, stirring for 3 hours, and cooling to room temperature to obtain the prepolymer.
(2) Chain extension reaction: dissolving 10mmol of 4,4' -diaminodiphenyl disulfide (APDS) serving as a chain extender into 2.5g of dimethylacetamide, dropwise adding the chain extender into the prepolymer prepared in the step (1), reacting at 40 ℃ for 3 hours, adding 84.2g of dimethylacetamide after the reaction is finished, and preparing the reaction solution into a reaction solution with the polymer concentration of 30% obtained through chain extension reaction.
(3) The reaction solution was poured into a polytetrafluoroethylene mold, and vacuum was maintained at 90 ℃ for 12h, and the residual solvent was removed to obtain an elastomer sheet (PDMS 3000 -APDS 10).
Example 2 preparation of a self-healing elastomer of the invention
(1) And (3) synthesizing a prepolymer, namely pouring 10mmol of hydroxypropyl-terminated polydimethylsiloxane (HO-PDMS 3000, the average molecular weight is 3000, the molecular weight range is 2000-4000) and 31.5mmol of isophorone diisocyanate (IPDI) into a flask, adding 3000ppm of catalyst dibutyltin dilaurate (DBTDL), introducing argon at 80 ℃, stirring for 3 hours, and cooling to room temperature to obtain the prepolymer.
(2) Chain extension reaction: dissolving 20mmol of 4,4' -diaminodiphenyl disulfide (APDS) serving as a chain extender into 2.5g of dimethylacetamide, dropwise adding the chain extender into the prepolymer prepared in the step (1), reacting at 40 ℃ for 3 hours, adding 95.5g of dimethylacetamide after the reaction is finished, and preparing the reaction solution into a reaction solution with the polymer concentration of 30% obtained through chain extension reaction.
(3) the reaction solution was poured into a polytetrafluoroethylene mold, and vacuum was maintained at 90 ℃ for 12h, and the residual solvent was removed to obtain an elastomer sheet (PDMS 3000 -APDS 20).
The advantageous effects of the present invention are demonstrated by specific test examples below.
Test example 1 characterization of self-healing elastomers of the invention
first, infrared characterization
1. Test method
Taking the self-repairing elastomers prepared in the examples 1-2, and carrying out Fourier infrared spectrum detection, wherein the specific detection method comprises the steps of respectively taking a small piece of elastomer for total reflection infrared test, measuring by adopting a NicoletIS50 infrared spectrometer produced by the Thermo company in the United states, scanning for 16 times at the resolution of 4cm -1, and taking the infrared spectrum of isophorone diisocyanate as a reference.
2. Test results
the infrared spectrogram of isophorone diisocyanate and each group of self-repairing elastomers is shown in figure 1, and the peak positions of each group in the infrared spectrogram are shown in table 1.
TABLE 1 position of the peak of each radical in the IR spectrum
FIG. 1 is a spectrum of infrared scanning of self-repairing elastomers with different APDS addition amounts, a peak 2258cm -1 corresponding to-NCO on IPDI disappears in PDMS 3000 -APDS 10 and PDMS 3000 -APDS 20 curves, which shows that IPDI participates in synthesis and fully reacts, two peaks 1620cm -1 and 1538cm -1 appear on PDMS 3000 -APDS 10 and PDMS 3000 -APDS 20 infrared spectrums, which are typical double peaks of a polyurea structure, because an ammonia chain extender is adopted, the polyurea peak appears more obviously and is in larger proportion, a C ═ O characteristic peak in a carbamate structure at cm -1 also exists, but the polyurea peak is obvious, 1260cm -1 and 788cm -1 are typical vibration peaks of C-Si-C on hydroxyl-terminated PDMS, 1082cm -1 and 1008cm -1 are stretching vibration peaks of hydroxyl-terminated PDMS main chain Si-O-Si, PDMS 6-APDS 10 and PDMS 27- 20 peaks do not disappear at the same time, and the infrared vibration peaks of the PDMS NCO-APDS appear in PDMS 1702 and PDMS 1702 peaks are not as well illustrated.
Second, Raman characterization
1. Test method
the self-repairing elastomers prepared in examples 1-2 were subjected to Raman spectroscopy. The specific detection method comprises the following steps: a small piece of material is taken from each group, Raman spectrum test is carried out by adopting an LABRAM-1B multichannel confocal micro Raman spectrometer, and laser with the wavelength of 532nm is selected for excitation.
2. Test results
FIG. 2 is a Raman spectrum of each group of self-repairing elastomers, which is excited by laser with the wavelength of 532nm, in FIG. 2, Raman vibration of main chain Si-O-Si appears at 490cm -1, a shoulder appears at 517cm -1, which is Raman response of S-S, and Raman vibration of S-S connected with a benzene ring structure appears at 1086cm -1.
Test example 2 detection of self-repairing Performance of self-repairing elastomer according to the present invention
1. Test method
The self-repairing elastomers prepared in the embodiments 1-2 are taken, the self-repairing performance is detected under different repairing conditions, and the mechanical performance of the repaired self-repairing elastomers is detected.
-1Tensile test was performed according to GB/T528-.
self-repairing test: samples were cut from the middle with a clean sharp blade. Then the cut surfaces of the broken sample are put together and placed in an oven at the temperature of 25 ℃ and 60 ℃ for self-repairing. Calculating the self-healing efficiency by the following formula:
2. Test results
The repair efficiency of each group of self-repairing elastomers under different repair conditions is shown in tables 2 and 3; tensile stress-strain curves of the groups of self-repairing elastomers after repair under different repair conditions are shown in FIGS. 3-4.
From the graphs of 3-4, tables 2 and 3, it can be seen that the elastomers added with APDS of 10mmol and 20mmol have similar mechanical strength and elongation at break, and at the same time, PDMS 3000 -APDS 10 and PDMS 3000 -APDS 20 both have good self-repairing performance, but the test result shows that the self-repairing performance of PDMS 3000 -APDS 10 is superior to that of PDMS 3000 -APDS 20 3000 -APDS 10, the self-repairing efficiency of tensile strength is 95.81% and the repairing efficiency of elongation at break is 73.26% when the PDMS 10 -APDS 20 repairs for 72h at 25 ℃, while the self-repairing efficiency of tensile strength is 85.13% and still lower than that of PDMS 3000 -APDS 10 after 7 days at 25 ℃, the shorter the self-repairing time is, the gentler the self-repairing temperature is and the higher the self-repairing efficiency is the better, which shows that the self-repairing performance of PDMS 3000 -APDS 10 is superior to that of PDMS 3000 -APDS 20, and the result shows that the more the reversible disulfide bond with the repairing function is better, the repairing performance is increased from 94.91 to 599, and the elongation at break of PDMS 599.
The results show that the room temperature self-repairing elastomer has the rapid room temperature and low temperature heating self-repairing performance, and the elastomer with the optimal self-repairing performance is PDMS 3000 -APDS 10.
TABLE 2 repair efficiency of self-healing elastomer PDMS 3000 -APDS 10 of the present invention at different temperatures
TABLE 3 repair efficiency of self-healing elastomer PDMS 3000 -APDS 20 of the present invention at different temperatures
Test example 3 thermal weight loss of self-repairing elastomer of the present invention
1. Test method
The thermal stability of the sample was tested by using TG STA 449C thermogravimeter manufactured by NETZSCH, Germany, under the condition that 5-10 mg of the sample was heated from 40 ℃ to 800 ℃ at a heating rate of 10K min -1 under a nitrogen flow (60mL min -1).
2. Test results
Thermal degradation thermogravimetric curves and DTG curves of the groups of self-repairing elastomers are respectively shown in FIG. 5 and FIG. 6; the thermal stability parameters under nitrogen for each set of self-healing elastomers are shown in table 4.
TABLE 4 thermal stability parameters under nitrogen for groups of self-repairing elastomers
As can be seen from the results of the thermal weight loss test of fig. 5, 6 and table 4: the self-repairing polyurethane elastomer has initial decomposition temperature as high as over 300 deg.c, initial thermal decomposition temperature in high level, maximum thermal weight loss peak of 469 deg.c and high thermal stability. The high initial decomposition temperature and the good thermal stability of the self-repairing elastomer can play a good role in protecting internal materials, prevent the erosion of heat flow and avoid the thermal damage of internal equipment.
In conclusion, the self-repairing elastomer has room temperature self-repairing performance and heat resistance, can quickly finish self-repairing at room temperature, has high repairing efficiency and good thermal stability, has the room temperature quick self-repairing function of a flexible heat-resistant material, can realize the maintenance-free characteristic of the material, effectively prolongs the service life, and fills the gap in the field. The self-repairing elastomer has stable use performance, wide use range and long service life, can be applied to systems of various elastomers, coating materials, encapsulating materials, adhesives and the like, is particularly applied to high-temperature environments or outer protective coatings and flexible workpiece materials with heat-resistant and ablation-resistant requirements, such as aircraft heat-proof coatings, and has the advantages of maintenance-free performance, high reliability and the like and excellent application prospect.
Claims (10)
1. A heat-resistant room temperature fast self-repairing elastomer is characterized in that: the polyurethane elastomer is prepared from hydroxypropyl end-capped polydimethylsiloxane, isocyanate and a chain extender as raw materials; wherein the molar ratio of the hydroxypropyl end-capped polydimethylsiloxane, the isocyanate and the chain extender is (1-10): 20-35): 10-25; the chain extender is an aliphatic or aromatic diamino disulfide containing reversible disulfide bonds.
2. The self-healing elastomer of claim 1, wherein: the molar ratio of the hydroxypropyl-terminated polydimethylsiloxane to the isocyanate to the chain extender is 10 (21-31.5) to 10-20.
3. The self-healing elastomer of claim 2, wherein: the molar ratio of the hydroxypropyl-terminated polydimethylsiloxane to the isocyanate to the chain extender is 10:21: 10.
4. The self-healing elastomer according to any one of claims 1 to 3, wherein: the isocyanate is diisocyanate, preferably isophorone diisocyanate, hexamethylene diisocyanate, 4' -dicyclohexylmethane diisocyanate or diphenylmethane diisocyanate; and/or the chain extender is 4,4' -diaminodiphenyl disulfide.
5. A preparation method of the self-repairing elastomer as claimed in any one of claims 1 to 4, characterized in that: it comprises the following steps:
(1) synthesis of prepolymer: adding a catalytic amount of catalyst into hydroxypropyl-terminated polydimethylsiloxane and isocyanate, and reacting to obtain a prepolymer;
(2) Chain extension reaction: dissolving a chain extender in an organic solvent, adding the chain extender into the prepolymer, and reacting to obtain a reaction solution;
(3) And pouring the reaction solution into a mould, and curing to obtain the product.
6. The method of claim 5, wherein:
in the step (1), the catalyst is dibutyltin dilaurate;
And/or, in the step (2), the organic solvent is dimethylacetamide or dimethylformamide.
7. The method of claim 5, wherein:
In the step (2), the method for adding the organic solvent containing the chain extender into the prepolymer is dropwise adding;
And/or, in the step (2), the reaction solution is prepared into a reaction solution with a polymer concentration of 30% by using dimethylacetamide or dimethylformamide for chain extension reaction.
8. The method of claim 5, wherein:
in the step (1), argon is introduced into the mixture for stirring for 1 to 6 hours at the temperature of between 60 and 100 ℃;
And/or in the step (2), the reaction is carried out for 2-4h at the temperature of 20-60 ℃;
And/or in the step (3), the solidification is carried out at 90 ℃ for 12 hours under vacuum, and residual solvent is removed;
Preferably, in the step (1), the reaction is carried out at 80 ℃ by introducing argon and stirring for 3 h;
And/or in the step (2), the reaction is carried out at 40 ℃ for 3 h.
9. Use of the self-healing elastomer of any one of claims 1 to 4 in the preparation of heat-resistant room temperature self-healing materials.
10. Use according to claim 9, characterized in that: the heat-resistant room temperature self-repairing material is an elastomer, a coating, a potting material or an adhesive; or the heat-resistant room temperature self-repairing material is an outer protective coating and a flexible workpiece material which are applied to a high-temperature environment or have heat-resistant and ablation-resistant requirements, and preferably, the heat-resistant room temperature self-repairing material is an outer coating of an aircraft.
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| CN111388355A (en) * | 2020-04-06 | 2020-07-10 | 华中科技大学同济医学院附属协和医院 | Skin protective agent for preventing pathogen contact and preparation method thereof |
| CN113308183A (en) * | 2021-06-28 | 2021-08-27 | 南京理工大学 | Outer heat-proof coating of dual selfreparing |
| CN113583617A (en) * | 2021-07-06 | 2021-11-02 | 梁永久 | Self-repairing reaction type polyurethane hot melt adhesive and preparation method thereof |
| CN115477734A (en) * | 2022-10-18 | 2022-12-16 | 北京化工大学 | Preparation method of intrinsic in-situ self-repairing anticorrosive polymer |
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