Normal-temperature fast-curing glue for bullet buffer protection and preparation method and application thereof

Abstract

This invention discloses a room-temperature rapid-curing adhesive for buffering and protecting propellant charges, its preparation method, and its application, belonging to the technical field of curing adhesive materials. The curing adhesive comprises two components: component A and component B. Component A is made from the following raw materials: isocyanate prepolymer, composite catalyst I, nano-reinforcing agent I, rheology modifier, and silane coupling agent. Component B is made from the following raw materials: amino-terminated polyether, amine chain extender, toughening interpenetrating phase material, composite catalyst II, nano-reinforcing agent II, and functional additives. The curing adhesive of this invention achieves rapid curing at room temperature and possesses excellent mechanical properties and compatibility with weapon materials. This curing adhesive can buffer, seal, and fix propellant charges between the charging shell or supporting structure, effectively improving the safety and reliability of weapon systems.

Description

Technical Field

[0001] This invention belongs to the field of curing adhesive materials technology, specifically relating to a room-temperature fast-curing adhesive for buffering and protecting propellant charges in ammunition, its preparation method, and its application. Background Technology

[0002] In the manufacturing processes of high-value warheads and precision munitions, propellant protection can reduce the intensity of irritation, preventing accidental ignition or lowering the probability of ignition. Coating buffer materials are a key functional component, primarily functioning to isolate the propellant charge from the metal casing, avoiding the frictional risks associated with direct contact. Simultaneously, they effectively buffer and dissipate dynamic loads such as penetration and impact, ensuring the integrity and reliability of the propellant structure (see Chinese Patent Publication No. CN104845572A). Therefore, the performance of the coating material directly affects the weapon's safety and terminal effectiveness.

[0003] Currently, the cushioning and protective materials used in this field mainly include the following technical systems: (1) Although traditional materials such as asphalt varnish and shellac have a history of application, their mechanical strength is generally low, their heat resistance is insufficient, or they have problems such as high brittleness and easy aging, making it difficult to meet the requirements of use under high overload and complex environmental conditions. (2) Silicone rubber materials have a wide operating temperature range and a certain damping buffering capacity, but their curing process is usually affected by factors such as humidity and thickness. Especially under the conditions of thick coating or large glue gap, complete curing often takes a long time. Therefore, in the pursuit of high-speed and continuous automated charging processes, this type of material often faces the process constraint of "long curing cycle or additional curing conditions".

[0004] (3) Aerogel materials have advantages in thermal insulation, but their engineering application is still constrained by multiple factors. On the one hand, aerogel materials (or their composite systems) generally suffer from high brittleness, insufficient mechanical strength, and high requirements for composite / interface bonding with the matrix and construction compatibility; on the other hand, the cost of their large-scale preparation and application is also a major constraint. Adhikary et al.'s review in Energy and Buildings (Aerogel based thermal insulatingcementitious composites: A review. Energy and Buildings, 2021, 245: 111058) has systematically discussed the practical challenges of aerogel composites in terms of mechanical properties, engineering compatibility and cost;

[0005] (4) Polyurethane / polyurea materials have attracted attention due to their adjustable curing, good adhesion and environmental resistance. After curing, they can form an adhesive layer with a certain elasticity, which can provide adhesion and buffering effect. However, when this type of system is used in modern precision loading processes that emphasize high efficiency and automation, its limitations are still prominent: On the one hand, in the disclosed solutions for loading and coating, common systems still have the problem of long curing time at room temperature. For example, the loading and coating material disclosed in Chinese Patent No. CN104845572A has a curing time of 48 to 60 hours at about 18 to 30 °C; On the other hand, although sprayed polyurea can achieve rapid film formation through high reactivity, the disclosed technology usually relies on special spraying processes and equipment conditions such as high temperature and high pressure collision atomization mixing (for example, Chinese Patent No. CN112300677A clearly describes "high temperature and high pressure collision atomization mixing process spraying", and Chinese Patent No. CN106753151A also gives the A / B components to be sprayed in a volume ratio of 1:1 using high pressure spraying equipment). In scenarios involving complex cavities, thick coatings, confined spaces, and extremely high requirements for dispensing windows and rheological stability in precision-filled materials, the aforementioned equipment dependence and window control issues will be further amplified.

[0006] Based on the current state of the aforementioned material systems, the core contradictions of existing technologies typically focus on the following aspects: The primary challenge lies in the trade-off between curing speed and final mechanical properties. Automated continuous production requires coating materials to set rapidly at room temperature to shorten process intervals and increase production cycle time. A common technique is to increase the reaction rate by increasing the amount of catalyst, but this often leads to insufficient formation of the polymer cross-linking network and shorter polymer chains. As a result, while the curing speed increases, key mechanical properties such as tensile strength and tear strength of the cured product deteriorate significantly. Conversely, if the goal is to optimize mechanical properties, the curing rate usually decreases drastically. Existing common polyurea AB adhesives require more than 24 hours to reach a curing state at 25°C, which cannot meet the rhythm requirements of automated production lines. This inability to simultaneously achieve "high curing speed" and "high mechanical strength" is the core bottleneck restricting existing technologies from meeting the needs of high-end applications.

[0007] Secondly, there are issues with the material's process compatibility. Automated spraying processes are extremely sensitive to the rheological properties of materials. Excessively high initial viscosity leads to poor leveling, easily resulting in uneven accumulation within complex cavities, making it difficult to control coating thickness. Furthermore, trapped air bubbles are difficult to remove, potentially becoming mechanical weak points or hotspots. Conversely, excessively low viscosity easily causes sagging, resulting in material waste and affecting film quality.

[0008] Furthermore, the curing process has a narrow window. If the curing process is too slow, the coating will migrate due to gravity, resulting in uneven thickness distribution; if the curing is too fast, it may not be able to achieve sufficient spray coverage and will lose its fluidity, affecting the continuity of the coating and the interfacial adhesion strength. The viscosity-time curves and curing characteristics of existing materials are difficult to match with the precise requirements of automated equipment for dispensing stability, atomization uniformity, and interlayer operation time.

[0009] Finally, the safety and compatibility of the material system are fundamental requirements. Since the buffer coating comes into direct contact with energetic materials, it must ensure its physicochemical stability under long-term storage and various environmental conditions, preventing harmful reactions with the main explosive components, binders, and other functional components. Furthermore, it should possess good thermal stability to avoid introducing additional thermal risks. Relevant compatibility assessments have standardized frameworks internationally; for example, NATO standardization protocol STANAG 4147 includes content on assessing the chemical compatibility of energetic materials with contact materials. Domestically, there are corresponding military testing method systems (such as GJB772A-1997 "Test Methods for Explosives"), and internationally, there are standards for explosive safety and performance qualification testing (such as MIL-STD-1751A). However, for engineering applications, some buffer coating systems still require more systematic public data and verification work to support their long-term compatibility, vacuum stability, and thermal decomposition behavior with typical explosive components such as HMX, RDX, aluminum powder, fluororubber, and HTPB.

[0010] In summary, existing propellant charge buffering and protective materials, especially polyurea systems, generally suffer from several drawbacks when facing modern automated propellant loading processes. These include the inability to simultaneously optimize rapid curing and high strength, insufficient compatibility of rheological and curing properties with automated equipment, and inadequate long-term safety and reliability data. Therefore, developing a novel buffering and protective adhesive that can cure rapidly at room temperature while possessing excellent mechanical properties, good workability, and high safety and reliability is of great significance for improving precision propellant loading technology and ensuring the effectiveness and safety of weapon systems.

[0011] It should be noted that the information disclosed in the background section above is only used to enhance the understanding of the background of this disclosure, and therefore may include information that does not constitute prior art known to those skilled in the art. Summary of the Invention

[0012] The purpose of this invention is to provide a room-temperature rapid-curing adhesive for the buffer protection of propellant charges, its preparation method, and its application. This invention solves the problems of existing buffer coating materials, such as difficulty in achieving rapid curing and high mechanical strength, insufficient process adaptability, and lack of long-term safety and reliability. The adhesive of this invention achieves rapid curing at room temperature and has good mechanical properties and compatibility with weapon materials. This adhesive can play a role in buffering, sealing, and fixing between the propellant charge and the loading shell or support structure, effectively improving the safety and reliability of the weapon system.

[0013] To achieve the above objectives, the present invention provides a room-temperature fast-curing adhesive for buffer protection of propellant charges, comprising: component A and component B; component A is made from the following raw materials in parts by weight: 88-92 parts by weight of isocyanate prepolymer, wherein the terminal -NCO content of the isocyanate prepolymer is 14.5-16.5%; 0.15-0.35 parts by weight of composite catalyst I, wherein composite catalyst I is a mixture of organobismuth and organozinc; and nano-reinforcing agent I. 1.5–3.5 parts by weight, wherein the nano-reinforcing agent I is sulfonated carbon nanotubes; 0.8–1.8 parts by weight of rheology modifier, wherein the rheology modifier is nano-silica; 1.0–2.5 parts by weight of silane coupling agent, wherein the silane coupling agent is aminopropyltriethoxysilane; Component B is made from the following raw materials in parts by weight: 45–55 parts by weight of terminal amino polyether, wherein the terminal amino polyether is a mixture of polyetheramine D230 and polyetheramine T5000; 20–28 parts by weight of amine chain extender, wherein the amine chain extender is a mixture of diethyltoluenediamine and 4,4'-bis-sec-butylaminodiphenylmethane; 12–18 parts by weight of toughening interpenetrating phase material, wherein the toughening interpenetrating phase material is a mixture of bisphenol A type epoxy resin and microencapsulated dicyandiamide; 0.25–0.6 parts by weight of composite catalyst II, wherein the composite catalyst II is a mixture of organotin and platinum; nano-reinforcing agent II 2.0 to 4.0 parts by weight, wherein the nano-reinforcing agent II is sulfonated carbon nanotubes; 4.0 to 8.0 parts by weight of functional additives, wherein the functional additives include at least one of defoamer, leveling agent, ultraviolet stabilizer and molecular sieve dehydrating agent.

[0014] Preferably, the isocyanate prepolymer is prepared by reacting diphenylmethane diisocyanate with polytetrahydrofuran ether diol; or / and, in the composite catalyst I, the mass ratio of organobismuth to organozinc is (1~2):1; or / and, the sulfonated carbon nanotubes have a diameter of 5~15 nm, a length of 10~30 μm, and a sulfonation degree of 5~10%; or / and, the nano-silica has a specific surface area of ​​200±25 m². 2 / g.

[0015] More preferably, the molecular weight of the polytetrahydrofuran ether diol is Mn=1000.

[0016] Preferably, the epoxy equivalent (EEW) of the bisphenol A type epoxy resin is 450~500 g / eq; or / and, in the amine chain extender, the mass ratio of diethyltoluene diamine to 4,4'-bis-sec-butylaminodiphenylmethane is (2~4):1; or / and, in the terminal amino polyether, the mass ratio of terminal amino polyether D230 to terminal amino polyether T5000 is 1:(2~5); or / and, in the toughening interpenetrating phase material, the mass ratio of bisphenol A type solid epoxy resin to microencapsulated dicyandiamide is (12~15):1; or / and, in the composite catalyst II, the mass ratio of organotin to platinum is (1~1.5): 1; or / and, the functional additive comprises the following components in parts by weight: 0.4 to 0.7 parts by weight of defoamer, 0.2 to 0.5 parts by weight of leveling agent, 0.4 to 0.8 parts by weight of ultraviolet stabilizer, and 3.0 to 6.0 parts by weight of molecular sieve dehydrating agent.

[0017] Preferably, component A is made from the following raw materials in parts by weight: 88-92 parts by weight of isocyanate prepolymer, 0.16-0.32 parts by weight of composite catalyst I, 1.5-3.5 parts by weight of nano-reinforcing agent I, 1.2-1.8 parts by weight of rheology modifier, and 1.7-2.3 parts by weight of silane coupling agent; component B is made from the following raw materials in parts by weight: 46-53 parts by weight of amino-terminated polyether, 22-25 parts by weight of amine chain extender, 12-18 parts by weight of toughening interpenetrating phase material, 0.25-0.6 parts by weight of composite catalyst II, 2.0-4.0 parts by weight of nano-reinforcing agent II, and 5.0-8.0 parts by weight of functional additives.

[0018] A second objective of this invention is to provide a method for preparing the aforementioned room-temperature rapid-curing adhesive for buffer protection of munition propellant charges, the method comprising: The preparation method of component A includes: dehydrating polytetrahydrofuran ether diol under vacuum at 110°C, then cooling to 60°C, adding diphenylmethane diisocyanate, and reacting at 80-90°C under inert gas protection; adding composite catalyst I and maintaining the temperature for reaction; cooling to below 50°C, adding nano-reinforcing agent I, rheology modifier and silane coupling agent, and dispersing by high-speed shearing at 2000-4000 rpm; after the NCO content is found to be qualified, filtering and vacuum degassing. The preparation method of component B includes: adding terminal amino polyether and amine chain extender to a premixing vessel and stirring and mixing evenly at 60°C; adding toughening interpenetrating phase material and stirring continuously until completely dissolved and dispersed; adding composite catalyst II, nano-reinforcing agent II and functional additives, stirring and dehydrating under vacuum at 80°C, then cooling to room temperature and filtering to obtain homogeneous component B.

[0019] The preparation principle and function of each component of the room-temperature rapid-curing adhesive for buffering and protecting propellant charge of this invention are explained below: The core of this invention lies in rapidly constructing a multi-network structure at room temperature using a specific two-component (A / B component) system. This structure is based on polyurea, with an epoxy resin interpenetrating network and nanomaterials as reinforcing phases, thereby achieving a balance between rapid curing, high strength, and high toughness.

[0020] 1. Main reaction and network formation: Formation of the polyurea backbone network: The isocyanate prepolymer in component A (containing highly reactive terminal NCO groups) undergoes a rapid nucleophilic addition reaction with the terminal amino polyether in component B (mainly providing flexible long chains) and amine chain extenders (such as DETDA and M-CDEA, providing rigid segments and regulating the reaction rate). This reaction can be rapidly accelerated at room temperature under the synergistic catalysis of composite catalysts I and II (organometallic catalysts such as bismuth, zinc, tin, platinum, etc.), forming urea bonds (NHCONH) in a short time and constructing a polyurea elastomer network with initial strength.

[0021] 2. Interpenetrating Network (IPN) toughening mechanism: Construction of the epoxy resin network: The toughening interpenetrating phase material in component B—bisphenol A type epoxy resin—and microencapsulated dicyandiamide constitute a latent curing system. Under the exothermic reaction of polyurea and the action of a catalyst, the microcapsule wall material gradually ruptures, releasing dicyandiamide, which acts as a curing agent and undergoes a ring-opening polymerization reaction with the epoxy groups of the epoxy resin. This reaction occurs slightly later than the main polyurea reaction, forming a second cross-linked network in situ within and between the interfaces of the already formed polyurea network, thus constituting a polyurea-epoxy interpenetrating polymer network. This IPN structure can effectively transfer and disperse stress, which is key to obtaining high tensile strength, high elongation at break, and excellent impact resistance in the material.

[0022] 3. Key component functions: Nano-reinforcing agent (sulfonated carbon nanotubes, S-CNTs): When added uniformly to components A and B, its nanoscale effect can significantly improve the modulus and strength of the material; sulfonation treatment improves its dispersibility in polar systems and its interfacial bonding with the polymer matrix; the flexibility and network structure of carbon nanotubes can effectively hinder crack propagation and further enhance toughness.

[0023] Composite catalyst system: Composite catalyst I (organobismuth / zinc) mainly catalyzes the isocyanate-amine reaction, controlling the initial gelation rate. Composite catalyst II (organotin / platinum) not only assists in catalyzing the main reaction but also promotes the epoxide-amine reaction, coordinating the formation kinetics of the two networks.

[0024] Rheology modifier (nano silica): It forms a reversible thixotropic network through hydrogen bonding and other interactions, giving the adhesive a suitable application viscosity, preventing sagging, and providing reinforcement after curing.

[0025] Silane coupling agents (such as KH-550): The functional groups at both ends of their molecules (one end binds to inorganic materials such as metal shells, and the other end reacts with organic materials) greatly enhance the chemical adhesion and durability of the cured adhesive to the metal shell and the surface of the propellant column.

[0026] Functional additives: Defoamers and leveling agents ensure uniform and defect-free coatings; UV stabilizers enhance weather resistance; molecular sieve dehydrating agents strictly control the moisture content of the system, preventing moisture from reacting with NCO to generate bubbles, thus ensuring storage stability and curing quality.

[0027] In summary, through the precise compatibility and synergistic effect of each component, this invention achieves a controllable and rapid transformation from "rapid flow dynamic construction" to "high-strength and high-toughness solid network".

[0028] Preferably, in the preparation method of component A and / or component B, the vacuum degree of dehydration is <-0.095 MPa.

[0029] A third objective of this invention is to provide the application of the aforementioned room-temperature rapid-curing adhesive for buffering and protecting munition charge in explosive loading.

[0030] Preferably, during use, the components A and B are mixed at a mass ratio of 1:(0.9~1.1), vacuum degassing is performed, and the degassed adhesive is applied to the surface of the workpiece or injected into the gap between the medicament and the shell, and then allowed to stand and cure in an environment with normal temperature and relative humidity <75%.

[0031] More preferably, the degassed adhesive is applied to the surface of the workpiece by spraying, brushing, or dipping.

[0032] The fourth objective of this invention is to provide a buffering protective coating containing the aforementioned room-temperature fast-curing adhesive for buffering protection of ammunition propellant.

[0033] The fifth objective of this invention is to provide an ammunition containing the aforementioned room-temperature fast-curing adhesive for buffering and protecting ammunition propellants.

[0034] The present invention relates to a room-temperature rapid-curing adhesive for buffer protection of propellant charges, its preparation method, and its application. This invention solves the problems of existing buffer coating materials, such as difficulty in simultaneously achieving rapid curing and high mechanical strength, insufficient process adaptability, and inadequate long-term safety and reliability. It has the following advantages: (1) The curing adhesive of the present invention achieves a balance between rapid curing and high mechanical properties. The room temperature rapid curing adhesive of the present invention can complete the operating window within 1 to 3 hours at room temperature, and the complete curing time is only 5 to 12 hours, which significantly shortens the time required for coating curing. This feature is very suitable for automated production lines, which can effectively improve production efficiency, while ensuring the mechanical properties of the adhesive after curing. Its tensile strength can reach more than 43 MPa, and its tensile breaking rate can reach more than 270%.

[0035] (2) The cured adhesive of the present invention has excellent buffering protection and impact resistance. By introducing nano-reinforcing agents and distributing them evenly in the two components, combined with the structure of the polyurea and epoxy resin interpenetrating network, a multi-scale, multi-mechanism synergistic toughening system is constructed, which can effectively absorb and disperse the dynamic load generated by penetrating impact, prevent friction and impact between the explosive charge and the metal shell, reduce the risk of explosive charge, and thus improve the reliability and combat effectiveness of the weapon system;

[0036] (3) The curing adhesive of the present invention has strong compatibility with weapon systems. The room temperature rapid curing adhesive of the present invention has good adhesion to propellant and metal casing, ensuring the stability of the buffer protective material in the explosive charge. Compared with traditional coating materials, the adhesive of the present invention is more adaptable to complex-shaped artillery ammunition columns and other support structures, ensuring its stability and durability in various environments. At the same time, all components of the room temperature rapid curing adhesive of the present invention have been screened and have good compatibility with typical energetic materials such as HMX, RDX, aluminum powder, and HTPB. It can maintain stable performance in long-term storage and complex environments without introducing additional risks, fundamentally ensuring the safety of the explosive charge of the weapon system;

[0037] (4) The curing adhesive of the present invention has strong process adaptability and is easy and reliable to apply. The room temperature fast curing adhesive formulation of the present invention is designed with the needs of automated production lines in mind, and has excellent rheological properties and stable spraying characteristics. Compared with traditional colloids, no bubbles or uneven coatings are generated during the curing process, and it has strong leveling and adhesion, ensuring the uniformity and sealing effect of the coating;

[0038] (5) The curing adhesive of the present invention achieves designability of performance and environmental friendliness. By adjusting the -NCO content (14.5~16.5%) in component A, the ratio of soft and hard polyetheramine segments in component B, and the amount of nanomaterials and epoxy resin added, the curing speed, hardness, modulus, and toughness can be specifically adjusted within a certain range to meet the buffering and protection requirements of different specific application scenarios. At the same time, the curing adhesive is a 100% solid content system or a solvent-free system, which is environmentally friendly and has a high material utilization rate. Attached Figure Description

[0039] Figure 1This is a viscosity-time curve of four room-temperature fast-curing adhesives tested by a rotational rheometer in the initial stage (0~60 minutes) according to the present invention.

[0040] Figure 2 A photograph of a standard dumbbell-shaped sample made from the room-temperature fast-curing adhesive of the present invention.

[0041] Figure 3 The stress-strain curves of the four room-temperature fast-curing adhesives of this invention are shown in the tensile test.

[0042] Figure 4 The following are the temperature rise DSC curves of the four room-temperature fast-curing adhesives of this invention. Detailed Implementation

[0043] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0044] It should be noted that: Unless otherwise specified in the examples, conditions should be followed according to standard conditions or the manufacturer's recommendations. Instruments whose manufacturers are not specified are all commercially available products. Raw materials and reagents whose manufacturers are not specified are all commercially available goods or can be prepared using known methods.

[0045] In this invention, all features defined in the form of numerical ranges or percentage ranges, such as numerical values, quantities, contents, and concentrations, are used only for simplicity and convenience. Accordingly, the description of numerical ranges or percentage ranges should be considered as covering and specifically disclosing all possible sub-ranges and individual numerical values ​​(including integers and fractions) within those ranges.

[0046] The features mentioned in this invention can be combined arbitrarily, and all possible combinations should be considered within the scope of this specification, provided that there is no contradiction in the combination of these features. Each feature disclosed in the specification can be replaced by any alternative feature that provides the same, equivalent, or similar purpose. Therefore, unless otherwise specified, the disclosed features are merely general examples of equivalent or similar features.

[0047] In the description of this invention, it should be noted that the terms "comprising," "including," or any other variations thereof are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element. Those skilled in the art will understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0048] The main raw materials used in the embodiments and experimental examples of this invention are described below. They are all raw materials that can be obtained by those skilled in the art through publicly available commercial channels or by laboratory preparation using known chemical methods: 1. Isocyanate prepolymer: It is a prepolymer prepared by reacting diphenylmethane diisocyanate (MDI, example: Wanhua Chemical MDI-100) and polytetrahydrofuran ether diol (PTMG, Mn=1000, such as BASF PolyTHF® 1000) at 80~85℃, and controlling its terminal -NCO mass content to be 14.5%~16.5%.

[0049] 2. Composite catalyst I (organo-bismuth / organo-zinc): Organic bismuth: such as organic bismuth / bismuth carboxylate catalysts (e.g., K-KAT® 348, produced by King Industries, USA).

[0050] Organic zinc: For example, highly active organic zinc catalysts (such as ZCAT-T50, produced by Guangzhou Yourun Synthetic Materials Co., Ltd.).

[0051] 3. Nano-reinforcing agents I & II (sulfonated carbon nanotubes, S-CNTs) were prepared in the laboratory: The original multi-walled carbon nanotubes (MWCNTs, with a diameter of 5-15 nm and a length of 10-30 μm, such as those produced by Chengdu Organic Chemistry Co., Ltd., Chinese Academy of Sciences) were subjected to reflux treatment with a mixture of concentrated sulfuric acid and nitric acid (volume ratio 3:1) to introduce oxygen-containing functional groups, followed by sulfation / sulfonation steps. The degree of sulfonation can be controlled at 5-10% by the treatment time.

[0052] The preparation method and references are as follows: (1) Mixed acid oxidation pretreatment (preparation of oxidized CNTs, O-CNTs): Multi-walled carbon nanotubes (MWCNTs) were placed in a concentrated sulfuric acid / concentrated nitric acid mixed acid system for wet oxidation treatment to introduce oxygen-containing functional groups such as -COOH, C=O, and -OH into the tube wall and end groups to obtain O-CNTs. The experimental conditions of the wet chemical oxidation route of MWCNTs by Wepasnick et al. (Surface and structural characterization of multi-walled carbon nanotubes following different oxidative treatments, Wepasnick et al., Carbon, 2011) can be referred to: H2SO4 and HNO3 were mixed in a ratio of 3:1 (total volume of about 8 mL), MWCNTs (e.g., 100 mg) were added, and the reaction was carried out at 70 °C for 8 h; after the reaction, residual acid and by-products were removed by centrifugation / repeated washing with water until the resistance of the supernatant reached the threshold described in the literature, and then the powder was heated to dryness and ball-milled for a short time to homogenize the sample.

[0053] (2) Further sulfation / sulfonation (to obtain sulfur-containing functional groups such as –SO3H and prepare S-CNTs): After obtaining O-CNTs, high-temperature treatment with concentrated sulfuric acid can be used to achieve chemical bonding of SO3H on the surface of carbon materials. For details, refer to the “direct sulfonation” process of carbon nanotubes / nanofibers reported by Koskin et al. (Synthesis and characterization of carbon nanomaterials functionalized by direct treatment with sulfonating agents, Koskin et al., Microporous and Mesoporous Materials, 2020): Take 1 g of carbon material and mix it with 10 mL of sulfonating agent (98% H2SO4 or 20% SO3 fuming sulfuric acid), and heat it at 100~250 ℃ for 10 h to obtain material containing –SO3H; or MSO4 / H2SO4 (5 wt% metal sulfate dissolved in concentrated sulfuric acid) can be used as a sulfonation aid mixture, and treated at 150~200 ℃ for 10 h, the effect of which is close to that of the fuming sulfuric acid system. The obtained material was filtered, washed with 1 M HCl and deionized water until the washings were free of chloride ions, and then dried at 110 °C to constant weight. The effect of sulfur introduction was characterized by elemental analysis (CHNS) / XPS.

[0054] 4. Rheology modifier (nano silica): fumed nano silica with a specific surface area of ​​200±25 m² / g, such as AEROSIL® 200, manufactured by Evonik Industries.

[0055] 5. Silane coupling agent: 3-aminopropyltriethoxysilane (KH-550), a commercially available general-purpose product (such as that produced by Nanjing Shuguang Chemical Group Co., Ltd.).

[0056] 6. Amino-terminated polyethers: Polyetheramine D230: Molecular weight approximately 230 g / mol, example is Huntsman Jeffamine® D-230.

[0057] Polyetheramine T5000: Molecular weight approximately 5000 g / mol, example is Huntsman Jeffamine® T-5000.

[0058] 7. Amine chain extenders: Diethyltoluenediamine (DETDA): Ethacure® 100, manufactured by Albemarle.

[0059] 4,4'-Di-sec-butylaminodiphenylmethane (M-CDEA): For example, Lonzacure® M-CDEA, manufactured by Lonza.

[0060] 8. Toughened interpenetrating phase materials: Bisphenol A type epoxy resin: epoxy equivalent (EEW) of 450~500 g / eq, such as EPON™ Resin 1001F.

[0061] Microencapsulated dicyandiamide: A latent curing agent prepared by acid-catalyzed in-situ polymerization in an oil / water emulsion system using dicyandiamide (DICY) as the core material and urea-formaldehyde resin (UF) as the wall material. It has an average particle size of 10–20 μm and an activation temperature of approximately 120 °C. The preparation process can be referenced from the work of Brown et al. (Reference: In situ poly(urea-formaldehyde) microencapsulation of dicyclopentadiene, Journal of Microencapsulation, 2003). Specifically: At room temperature, deionized water was mixed with a 2.5 wt% aqueous solution of ethylene-maleic anhydride copolymer (EMA) and stirred at 200–2000 rpm to form a continuous aqueous phase. Urea (5.00 g), ammonium chloride (0.50 g), and resorcinol (0.50 g) were added sequentially under stirring to dissolve the mixture. The pH of the system was then adjusted to approximately 3.50 using NaOH / HCl, and 1–2 drops of 1-octanol were added to defoam. The core material (DCPD in the literature; for DICY, the DICY micropowder can be dispersed in a water-insoluble core phase before emulsification using the same method) was slowly added to form an oil / water emulsion and stabilized for approximately 10 min. Then, a 37 wt% aqueous formaldehyde solution (12.67 g in the literature, resulting in a formaldehyde / urea molar ratio of approximately 1:1.9) was added, and the mixture was covered and stirred at approximately 1 °C·min. -1 The temperature was raised to 55 °C and reacted for 4 h under continuous stirring, so that the urea-formaldehyde resin prepolymer was deposited at the core material-water interface and further crosslinked to form the capsule wall. After the reaction was completed and cooled to room temperature, the microcapsules were separated by vacuum filtration, washed with deionized water and air-dried for 24-48 h to obtain free-flowing powdered microcapsules.

[0062] 9. Composite Catalyst II: Organotin: For example, dibutyltin dilaurate (DBTDL, 95% purity, produced by Aladdin).

[0063] Platinum catalysts: for example, diethylenetetramethyldisiloxane platinum complex (platinum content 2000 ppm, produced by Macklin).

[0064] 10. Functional additives: Defoamers: such as polysiloxane defoamers (e.g., BYK-141, produced by BYK).

[0065] Leveling agents: such as polyether-modified polysiloxane leveling agents (e.g., BYK-333, produced by BYK).

[0066] UV stabilizers: such as benzotriazole UV absorbers (e.g., Tinuvin® 1130, manufactured by BASF).

[0067] Molecular sieve dehydrating agents: such as 4A type molecular sieve powder, a commercially available general-purpose product.

[0068] Example 1 A room-temperature fast-curing adhesive for buffering and protecting propellant charges in ammunition consists of component A and component B in a 1:1 mass ratio.

[0069] Component A is made from the following raw materials in the following mass percentages: 89.00 parts by weight of isocyanate prepolymer (NCO content of 14.8%), 0.18 parts by weight of composite catalyst I (organobismuth: organozinc = 1.2:1), 2.20 parts by weight of nano-reinforcing agent I, 1.50 parts by weight of rheology modifier and 2.12 parts by weight of silane coupling agent.

[0070] Component B is composed of the following raw materials in the indicated weight percentages: 53.00 parts by weight of terminal amino polyether, 22.50 parts by weight of amine chain extender, 13.50 parts by weight of toughening interpenetrating phase material, 0.30 parts by weight of composite catalyst II (organotin:platinum = 1:1), 3.00 parts by weight of nano-reinforcing agent II, and 7.70 parts by weight of functional additives. Specifically, the functional additives consist of 0.7 parts by weight of defoamer, 0.4 parts by weight of leveling agent, 0.6 parts by weight of UV stabilizer, and 6.0 parts by weight of molecular sieve dehydrating agent. The terminal amino polyether is selected from a mixture of terminal amino polyether D230 and terminal amino polyether T5000 in a mass ratio of 1:4.8. The amine chain extender is selected from a mixture of diethyltoluene diamine (DETDA) and 4,4-bis-sec-butylaminodiphenylmethane (M-CDEA) in a mass ratio of 3.0:1. The toughening interpenetrating phase material is selected from a mixture of bisphenol A type epoxy resin and microencapsulated dicyandiamide in a mass ratio of 14:1. The nano-reinforcing agent II is selected from sulfonated carbon nanotubes.

[0071] The preparation method of this room-temperature fast-curing adhesive is as follows: Preparation of Component A: Polytetrahydrofuran ether diol (PTMG, Mn=1000) was weighed and dehydrated for 2 h at 110℃ and a vacuum degree <-0.095MPa. After cooling to 60℃, diphenylmethane diisocyanate (MDI) was added, and the mixture was heated to 82℃ and reacted for 3 h under nitrogen protection to obtain the isocyanate prepolymer. After the reaction, a sample was taken, and the mass fraction of -NCO in the prepolymer was determined by the di-n-butylamine-hydrochloric acid back titration method. When the -NCO content reached the preset range, the next step was performed; if the target was not met, the holding time was extended or the MDI / polyol ratio was adjusted and the reaction continued until the target was reached. Subsequently, composite catalyst I was added, and the reaction was maintained for 1 h. After cooling to below 50℃, S-CNTs, fumed silica nanoparticles, and KH-550 were added, and the mixture was dispersed by high-speed shearing at 3000 rpm for 40 min. After dispersion, take another sample to determine the NCO content. After confirming that it is still within the specified range of component A, filter, vacuum degas and seal for storage.

[0072] Preparation of Component B: Weigh out the terminal amino polyethers (D230 and T5000) and amine chain extenders (DETDA and M-CDEA) according to the formulation, and mix them evenly at 60°C. Add solid epoxy resin powder and microencapsulated dicyandiamide, and stir until completely dissolved and dispersed. Add composite catalyst II, S-CNTs, and all functional additives, and stir to dehydrate for 1.5 hours at 80°C and a vacuum degree <-0.095 MPa. Cool to room temperature, filter, and obtain homogeneous component B, which is then sealed and stored in the dark.

[0073] When using, weigh component A and component B at a mass ratio of 1:1 and mechanically mix for 4 minutes. After vacuum degassing, spray the mixture onto the sample surface. Allow it to stand and cure at 25°C and relative humidity <75%. The surface fluidity will disappear in about 3 hours, and it will be fully cured after 8 hours.

[0074] Example 2 A room-temperature fast-curing adhesive for buffering and protecting propellant charges in ammunition is basically the same as in Example 1, except that: Component A is made from the following raw materials in the following weight percentages: 90.50 parts by weight of isocyanate prepolymer (NCO content of 16.4%), 0.32 parts by weight of composite catalyst I (organobismuth:organozinc = 1.8:1), 1.80 parts by weight of nano-reinforcing agent I, 1.40 parts by weight of rheology modifier and 1.98 parts by weight of silane coupling agent.

[0075] Component B is made from the following raw materials in the following weight percentages: 48.00 parts by weight of terminal amino polyether, 26.00 parts by weight of amine chain extender, 13.00 parts by weight of toughening interpenetrating phase material, 0.58 parts by weight of composite catalyst II (organotin:platinum = 1.2:1), 3.00 parts by weight of nano-reinforcing agent II, and 7.42 parts by weight of functional additives. Specifically, the functional additives consist of 0.5 parts by weight of defoamer, 0.4 parts by weight of leveling agent, 0.6 parts by weight of UV stabilizer, and 5.92 parts by weight of molecular sieve dehydrating agent. The terminal amino polyether is selected from a mixture of terminal amino polyether D230 and terminal amino polyether T5000 in a mass ratio of 1:3.5. The amine chain extender is selected from a mixture of diethyltoluene diamine (DETDA) and 4,4'-bis-sec-butylaminodiphenylmethane (M-CDEA) in a mass ratio of 4.0:1. The toughening interpenetrating phase material is selected from a mixture of bisphenol A type epoxy resin and microencapsulated dicyandiamide in a mass ratio of 12.5:1. The nano-reinforcing agent II is selected from sulfonated carbon nanotubes.

[0076] The preparation method of components A and B of this room-temperature fast-curing adhesive is basically the same as that in Example 1, and the components are added according to the dosage of each component in this example. When using, weigh them at a mass ratio of 1:1 and mechanically stir for 3 minutes. After vacuum degassing, pour or spray. Allow to cure at 25°C and relative humidity <75%. Surface fluidity disappears in about 1 hour, and it is fully cured after 5 hours.

[0077] Example 3 A room-temperature fast-curing adhesive for buffering and protecting propellant charges in ammunition is basically the same as in Example 1, except that: Component A is made from the following raw materials in the following weight percentages: 91.20 parts by weight of isocyanate prepolymer (NCO content of 15.6%), 0.22 parts by weight of composite catalyst I (organobismuth:organozinc = 1.5:1), 1.50 parts by weight of nano-reinforcing agent I, 1.20 parts by weight of rheology modifier and 1.78 parts by weight of silane coupling agent.

[0078] Component B is composed of the following raw materials in the indicated weight percentages: 52.00 parts by weight of terminal amino polyether, 23.50 parts by weight of amine chain extender, 12.00 parts by weight of toughening interpenetrating phase material, 0.35 parts by weight of composite catalyst II (organotin:platinum = 1:1), 2.0 parts by weight of nano-reinforcing agent II, and 5.4 parts by weight of functional additives. Specifically, the functional additives consist of 0.4 parts by weight of defoamer, 0.25 parts by weight of leveling agent, 0.6 parts by weight of UV stabilizer, and 4.15 parts by weight of molecular sieve dehydrating agent. The terminal amino polyether is selected from a mixture of terminal amino polyether D230 and terminal amino polyether T5000 in a weight ratio of 1:4.5. The amine chain extender is selected from a mixture of DETDA and M-CDEA in a weight ratio of 3.3:1. The toughening interpenetrating phase material is selected from a mixture of bisphenol A type epoxy resin and microencapsulated dicyandiamide in a weight ratio of 13:1. Nano-reinforcing agent II is selected from sulfonated carbon nanotubes.

[0079] The preparation method of components A and B of this room-temperature fast-curing adhesive is basically the same as that in Example 1, and the components are added according to the dosage of each component in this example. When using, weigh them at a mass ratio of 1:1 and mechanically stir for 4 minutes. After vacuum degassing, apply by brushing or spraying. Allow to cure at 25°C and relative humidity <75%. Surface fluidity disappears in about 1.5 hours, and it is fully cured after 5.5 hours.

[0080] Example 4 A room-temperature fast-curing adhesive for buffering and protecting propellant charges in ammunition is basically the same as in Example 1, except that: Component A is made from the following raw materials in the following weight percentages: 88.00 parts by weight of isocyanate prepolymer (NCO content is 15.2%), 0.16 parts by weight of composite catalyst I (organobismuth:organozinc = 2:1), 3.50 parts by weight of nano-reinforcing agent I, 1.80 parts by weight of rheology modifier and 2.24 parts by weight of silane coupling agent.

[0081] Component B is made from the following raw materials in the following weight percentages: 46.00 parts by weight of terminal amino polyether, 24.50 parts by weight of amine chain extender, 17.50 parts by weight of toughening interpenetrating phase material, 0.28 parts by weight of composite catalyst II (organotin:platinum = 1.5:1), 4.0 parts by weight of nano-reinforcing agent II, and 7.52 parts by weight of functional additives. Specifically, the functional additives consist of 0.65 parts by weight of defoamer, 0.4 parts by weight of leveling agent, 0.75 parts by weight of UV stabilizer, and 5.72 parts by weight of molecular sieve dehydrating agent. The terminal amino polyether is selected from a mixture of terminal amino polyether D230 and terminal amino polyether T5000 in a mass ratio of 1:2.5. The amine chain extender is selected from a mixture of DETDA and M-CDEA in a mass ratio of 2.8:1. The toughening interpenetrating phase material is selected from a mixture of bisphenol A type epoxy resin and microencapsulated dicyandiamide in a mass ratio of 15:1. Nano-reinforcing agent II is selected from sulfonated carbon nanotubes.

[0082] The preparation method of components A and B of this room-temperature fast-curing adhesive is basically the same as that in Example 1, and the components are added according to the dosage of each component in this example. When using, weigh them at a mass ratio of 1:1 and mechanically stir for 5 minutes. After vacuum degassing, proceed with potting or spraying. Allow to cure statically at 25°C and relative humidity <75%. Surface fluidity disappears in approximately 2 hours, and complete curing occurs after 6 hours.

[0083] The room-temperature fast-curing adhesives prepared in Examples 1-4 were tested as follows: Experimental Example 1: Curing Time Test at Room Temperature (25℃) After mixing components A and B at a mass ratio of 1:1 until homogeneous, immediately pour the mixture into a polytetrafluoroethylene mold and place it in an environment with a temperature of 25±1℃ and a relative humidity of <75% for static curing. Starting from the time the mixing is completed, observe and record the surface state of the adhesive every 30 minutes, including changes in fluidity, viscosity, and degree of curing, until the sample is completely cured and loses its tackiness.

[0084] Referring to Table 1, the results show that the adhesive prepared in Example 1 lost its surface fluidity in about 3 hours (i.e., the process operation window time) and was completely cured after 8 hours; the adhesive in Example 2 lost its surface fluidity in about 1 hour and was completely cured after 5 hours; the adhesive in Example 3 lost its surface fluidity in about 1.5 hours and was completely cured after 5.5 hours; and the adhesive in Example 4 lost its surface fluidity in about 2 hours and was completely cured after 6 hours.

[0085] Table 1. Room temperature curing time of the room temperature fast-curing adhesives in Examples 1-4 Experimental Example 2: Viscosity Testing Using a Rotational Rheometer The test was conducted using a rotational rheometer. A PP35Ti disc rotor was used, and the test temperature was set to 25±1℃ with a constant shear rate of 10.00 s⁻¹. -1 The mixed adhesive was continuously tested for 3600 seconds, and the change in apparent viscosity over time was recorded in real time.

[0086] like Figure 1 The figure shows the viscosity-time curves of four room-temperature fast-curing adhesives tested by a rotational rheometer during the initial stage (0-60 minutes). The results show that the initial viscosity of the four adhesives ranges from 500 to 1500 mPa·s, indicating good workability. As the test progressed, the viscosity of all four adhesives showed an increasing trend, but the rate of increase differed significantly. Specifically, the adhesive in Example 2 showed the fastest viscosity increase, followed by Examples 4 and 3, while the adhesive in Example 1 showed the slowest viscosity increase. This trend is consistent with the curing rate of each example.

[0087] Experiment Example 3: Mechanical Tensile Strength Test of Film Prepare standard dumbbell-shaped specimens (Type II, see below) from the fully cured adhesive. Figure 2 According to GB / T 528-2009 "Determination of Tensile Stress-Strain Properties of Vulcanized Rubber or Thermoplastic Rubber", a universal testing machine was used for testing. The tensile speed was set to 500 mm / min, and the maximum stress and elongation at break of the specimen were recorded.

[0088] like Figure 3 The figures shown are stress-strain curves for four room-temperature fast-curing adhesives in tensile tests, with (a) to (d) corresponding to Examples 1 to 4 respectively. See also... Figure 3 According to Table 2, the results show that the colloid prepared in Example 4 has the most outstanding mechanical properties, with a tensile strength higher than 43 MPa and an elongation at break of approximately 249%; the colloid in Example 1 has a tensile strength of approximately 12.9 MPa and an elongation at break of approximately 271%; the colloid in Example 2 has a tensile strength of approximately 2.1 MPa and an elongation at break of approximately 156%; and the colloid in Example 3 has a tensile strength of approximately 1.7 MPa and an elongation at break of approximately 144%.

[0089] Table 2 Summary of mechanical properties of the room temperature rapid curing adhesives in the four examples Experimental Example 4: Temperature Rise Differential Scanning Calorimeter (DSC) Test Differential scanning calorimetry (DSC) was used to analyze the cured adhesive samples. 5–10 mg of sample was taken and scanned from 25 °C to 450 °C at a heating rate of 10 °C / min under a high-purity argon atmosphere (flow rate 40 mL / min) to obtain the DSC curves.

[0090] like Figure 4The figure shows the DSC curves of four room-temperature fast-curing adhesives. The results show that no obvious exothermic decomposition peaks appeared in the DSC curves of the four adhesive samples within the temperature range of 25℃ to 400℃, indicating good thermal stability of the material within this range. The endothermic peaks observed in the 300℃~400℃ range are attributed to the melting process of the crystalline components in the material, and their initial melting temperature is much higher than the actual construction and use temperatures.

[0091] Experimental Example 5: Vacuum Stability Test and Compatibility Test of Energetic Propellant Column Raw Materials 1. Vacuum stability test Tests were performed according to GJB 772A-97 Method 502.1 (Pressure Sensor Method). Accurately weigh 5.0±0.1 g of the gel sample from each example and place it in a test tube. Heat at 100±0.5℃ for 48 hours. After cooling, measure the released gas pressure and calculate the gas release per gram of sample (mL / g). Each group was tested in triplicate.

[0092] 2. Compatibility testing of raw materials for energetic propellant columns Tests were conducted according to GJB 772A-97 Method 501.2 (Pressure Sensor Method). Each example's gel sample was uniformly mixed with an equal mass of typical energetic materials (HMX, RDX, aluminum powder, fluororubber F2462, HTPB, etc.) and the outgassing amount of the mixed sample and the single component was tested under the same conditions (100℃, 48h). Compatibility was evaluated based on the net increase in outgassing amount.

[0093] The results are shown in Tables 3 and 4. The test results show that the room temperature rapid curing adhesives of Examples 1 to 4 have stable physicochemical properties and excellent vacuum stability test results. The room temperature rapid curing adhesives of Examples 1 to 4 have good compatibility with common raw materials of energetic propellant grains and have high safety, making them suitable for coating buffer materials of propellant grains in weapons and equipment.

[0094] Table 3. Vacuum stability test results of the four examples of room temperature rapid curing adhesives Table 4. Compatibility test results of the room-temperature rapid-curing adhesive with common raw materials of the propellant cartridge in four examples. Note: HMX is Octogen; RDX is RDX; Al is aluminum powder; F2462 is fluororubber F2462; PTFE is polytetrafluoroethylene; W68 is No. 68 special wax; HTPB is hydroxyl-terminated polybutadiene; DOA is dioctyl adipate.

[0095] Although the present invention has been described in detail through the preferred embodiments above, it should be understood that the above description should not be considered as a limitation of the present invention. Various modifications and substitutions to the present invention will be apparent to those skilled in the art after reading the above description. Therefore, the scope of protection of the present invention should be defined by the appended claims.

Claims

1. A room-temperature rapid-curing adhesive for cushioning and protecting propellant charges in ammunition, characterized in that, This curing adhesive comprises: Component A and Component B; Component A is made from the following raw materials in parts by weight: 88-92 parts by weight of isocyanate prepolymer, wherein the mass content of terminal -NCO in the isocyanate prepolymer is 14.5-16.5%; Composite catalyst I: 0.15-0.35 parts by weight, wherein composite catalyst I is a mixture of organobismuth and organozinc; Nano-reinforcing agent I, 1.5 to 3.5 parts by weight, wherein nano-reinforcing agent I is sulfonated carbon nanotubes; 0.8 to 1.8 parts by weight of rheology modifier, wherein the rheology modifier is nano-silica; 1.0 to 2.5 parts by weight of silane coupling agent, wherein the silane coupling agent is aminopropyltriethoxysilane; Component B is made from the following raw materials in parts by weight: 45-55 parts by weight of amino-terminated polyether, wherein the amino-terminated polyether is a mixture of polyetheramine D230 and polyetheramine T5000; 20-28 parts by weight of an amine chain extender, wherein the amine chain extender is a mixture of diethyltoluenediamine and 4,4'-bis-sec-butylaminodiphenylmethane; 12-18 parts by weight of toughening interpenetrating phase material, wherein the toughening interpenetrating phase material is a mixture of bisphenol A type epoxy resin and microencapsulated dicyandiamide; Composite catalyst II, 0.25-0.6 parts by weight, wherein composite catalyst II is a mixture of organotin and platinum; Nano-reinforcing agent II, 2.0-4.0 parts by weight, wherein the nano-reinforcing agent II is sulfonated carbon nanotubes; The functional additives comprise 4.0 to 8.0 parts by weight, wherein the functional additives include at least one of defoamer, leveling agent, ultraviolet stabilizer and molecular sieve dehydrating agent.

2. The room-temperature rapid-curing adhesive for buffering and protecting propellant charges according to claim 1, characterized in that, The isocyanate prepolymer is prepared by reacting diphenylmethane diisocyanate with polytetrahydrofuran ether diol; Or / and, in the composite catalyst I, the mass ratio of organic bismuth to organic zinc is (1~2):1; Or / and, the sulfonated carbon nanotubes have a diameter of 5-15 nm, a length of 10-30 μm, and a sulfonation degree of 5-10%; Or / and, the specific surface area of ​​the nano-silica is 200±25 m². 2 / g.

3. The room-temperature rapid-curing adhesive for buffering and protecting propellant charges according to claim 2, characterized in that, The molecular weight of the polytetrahydrofuran ether diol is Mn=1000.

4. The room-temperature rapid-curing adhesive for buffering and protecting propellant charges according to any one of claims 1 to 3, characterized in that, The epoxy equivalent (EEW) of the bisphenol A type epoxy resin is 450~500 g / eq; Or / and, in the amine chain extender, the mass ratio of diethyltoluenediamine to 4,4'-bis-sec-butylaminodiphenylmethane is (2~4):1; Or / and, in the terminal amino polyether, the mass ratio of terminal amino polyether D230 to terminal amino polyether T5000 is 1:(2~5). Or / and, in the toughening interpenetrating phase material, the mass ratio of bisphenol A type solid epoxy resin to microencapsulated dicyandiamide is (12~15):1; Or / and, in the composite catalyst II, the mass ratio of organotin to platinum is (1~1.5):1; Or / and, the functional additive comprises the following components in parts by weight: 0.4 to 0.7 parts by weight of defoamer, 0.2 to 0.5 parts by weight of leveling agent, 0.4 to 0.8 parts by weight of UV stabilizer, and 3.0 to 6.0 parts by weight of molecular sieve dehydrating agent.

5. The method for preparing a room-temperature rapid-curing adhesive for buffering and protecting propellant charges as described in any one of claims 1 to 4, characterized in that, The method includes: The preparation method of component A includes: Polytetrahydrofuran ether diol was dehydrated under vacuum at 110°C, then cooled to 60°C, and diphenylmethane diisocyanate was added. The mixture was then heated to 80-90°C under inert gas protection. Composite catalyst I was added, and the reaction was maintained at this temperature. The mixture was then cooled to below 50°C, and nano-reinforcing agent I, rheology modifier, and silane coupling agent were added. The mixture was then dispersed by high-speed shearing at 2000-4000 rpm. After the NCO content is found to be within acceptable limits, the mixture is filtered and then degassed under vacuum. The preparation method of component B includes: The terminal amino polyether and amine chain extender were added to the premixing vessel and stirred and mixed evenly at 60°C. The toughening interpenetrating phase material was added and stirred until completely dissolved and dispersed. The composite catalyst II, nano-reinforcing agent II and functional additives were added and stirred and dehydrated under vacuum at 80°C. Then the mixture was cooled to room temperature and filtered to obtain a homogeneous component B.

6. The preparation method according to claim 5, characterized in that, In the preparation method of component A and / or component B, the vacuum degree of dehydration is <-0.095 MPa.

7. The application of the room-temperature rapid-curing adhesive for buffer protection of ammunition propellant as described in any one of claims 1 to 4 in explosive loading.

8. The application according to claim 7, characterized in that, When using, mix components A and B at a mass ratio of 1:(0.9~1.1), perform vacuum degassing, apply the degassed adhesive to the surface of the workpiece or inject it into the gap between the medicament and the shell, and allow it to cure statically at room temperature and relative humidity <75%.

9. A buffer protective coating comprising a room-temperature fast-curing adhesive for buffer protection of munition propellant as described in any one of claims 1 to 4.

10. A type of ammunition containing a room-temperature fast-curing adhesive for buffering and protecting propellant charge as described in any one of claims 1 to 4.

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