CN-117089184-B - Castable ablation-resistant coating material and preparation method thereof

Abstract

The invention provides a castable ablation-resistant coating material and a preparation method thereof, the material consists of unsaturated polyester resin, cobalt naphthenate, cyclohexanone peroxide, trichloroethyl phosphate, boron phenolic resin, silicon carbide and hexa (4-aldehyde phenoxy) cyclotriphosphazene. According to the invention, the coating material is subjected to compound optimization design, so that the finally prepared castable ablation-resistant coating material has the ablation rate as low as 0.11mm/s and the viscosity as low as 5900 mPa & s, namely the material has excellent ablation resistance and pouring technological performance, and has a wide application prospect in the filling and pouring coating of solid rocket engines.

Inventors

• CHEN GUOHUI
• YANG SHISHAN
• WEI LE
• LIU CHEN
• LI PENG
• WANG WENTAO
• LIU JIANLI
• LU XIANGHUI

Assignees

• 西安近代化学研究所

Dates

Publication Date

20260505

Application Date

20230726

Claims (9)

1. 1. The castable ablation-resistant coating material is characterized by comprising unsaturated polyester resin, cobalt naphthenate, cyclohexanone peroxide, trichloroethyl phosphate, boron phenolic resin, silicon carbide and hexa (4-aldehyde phenoxy) cyclotriphosphazene; The material comprises, by mass, 40% -80% of unsaturated polyester resin, 0.05% -1% of cobalt naphthenate, 0.05% -10.0% of cyclohexanone peroxide, 1% -15% of trichloroethyl phosphate, 1% -20% of boron phenolic resin, 1% -20% of silicon carbide, 1% -25% of hexa (4-aldehyde phenoxy) cyclotriphosphazene, and 100% of the total mass of the raw materials.
2. 2. The castable ablation-resistant coating material of claim 1, wherein the material comprises, by mass, 50% -70% of unsaturated polyester resin, 0.1% -0.4% of cobalt naphthenate, 1.0% -5.0% of cyclohexanone peroxide, 3% -8% of trichloroethyl phosphate, 5% -15% of boron phenolic resin, 5% -15% of silicon carbide, 5% -20% of hexa (4-aldehyde phenoxy) cyclotriphosphazene, and 100% of the total mass of the raw materials.
3. 3. The castable ablation-resistant coating material of claim 2, wherein the material comprises, by mass, 58.2% -66.94% of unsaturated polyester resin, 0.22% -0.26% of cobalt naphthenate, 2.7% -3.0% of cyclohexanone peroxide, 4.7% -6.1% of trichloroethyl phosphate, 7% -10% of boron phenolic resin, 7.4% -9% of silicon carbide, 10% -15.95% of hexa (4-aldehyde phenoxy) cyclotriphosphazene, and 100% of the total mass of the raw materials.
4. 4. The castable ablation-resistant coating material of claim 2, wherein the material has a linear ablation rate as low as 0.11 mm/s and a viscosity as low as 5900 mPa s.
5. 5. A method for producing a castable ablation-resistant coating material according to any one of claims 1 to 4, comprising the steps of: step one, pre-drying silicon carbide and hexa (4-aldehyde phenoxy) cyclotriphosphazene to remove water, and then drying and cooling to room temperature; Adding boron phenolic resin, hexa (4-aldehyde phenoxy) cyclotriphosphazene and silicon carbide into unsaturated polyester resin according to a proportion, and stirring uniformly to obtain a premixed sizing material; Step three, adding the pre-mixed sizing material prepared in the step two to a three-roller grinder for grinding and then discharging, repeating the above processes for a plurality of times until the sizing material is uniform, and then discharging to prepare the grinding sizing material; adding the weighed trichloroethyl phosphate and cyclohexanone peroxide into the grinding sizing material prepared in the step three, and stirring the mixture until the mixture is uniform; Pouring the coating rubber material prepared in the step four into a mold and then evacuating; And step six, placing the mold with the coating rubber material into an oven for curing, and after the curing is finished, withdrawing the mold to obtain the castable ablation-resistant coating material.
6. 6. The method of claim 5, wherein in the first step, the pre-baking water is at 80-150 ℃ for 1-3 hours.
7. 7. The method of claim 5, wherein in step three, the grinding time is 5-30 minutes.
8. 8. The method for preparing the castable ablation-resistant coating material of claim 5, the method is characterized in that in the fifth step, the evacuation time is 5-30 minutes.
9. 9. The method of claim 5, wherein in the sixth step, the curing temperature is 20-60 ℃ and the curing time is 8-24 hours.

Description

Castable ablation-resistant coating material and preparation method thereof Technical Field The invention belongs to the technical field of coating of energetic materials, relates to an unsaturated polyester resin coating material, and in particular relates to a castable ablation-resistant coating material and a preparation method thereof. Background The coating layer is an important component of solid rocket engine charge, is mostly made of polymer materials, and is generally coated on the periphery of the propellant, so that the propellant can be combusted according to a preset rule and plays roles of limiting combustion and insulating heat. The cladding layer forming process mainly comprises an injection molding process, a winding process, a covering process, a pasting process, a pressing and pouring process. The casting molding process has wide adaptability, is an important component of the existing propellant process lines of screw compression, compounding, particle casting, casting and the like, and is widely applied to rocket projectiles, tactical missiles and various ejection weapon systems. The unsaturated polyester resin is a linear polymer compound formed by polycondensation of unsaturated, saturated dibasic acid and unsaturated dihydric alcohol, and is diluted by a crosslinking monomer or an active solvent to form a resin solution with certain viscosity. Because of low viscosity, is a coating raw material which is naturally applicable to the casting process, at present, the method is applied to the fields of various missiles, engines, rockets and the like. Due to the technical development, the charging energy is higher and higher, and the coating layer is seriously ablated and eroded when the rocket is started to charge the powder. The main chain structure of the unsaturated polyester resin belongs to aliphatic molecules, the ablation resistance of the main chain structure is poor, and the requirements of propellant combustion limitation and heat insulation for protecting an engine can not be met generally, so that how to improve the ablation resistance of the unsaturated polyester resin coating layer is always an important research work of scientific researchers. At present, the simplest and effective means for improving the ablation resistance of the unsaturated polyester resin coating layer is by compounding a filler. For example, the effect of phosphazene flame retardant on the performance of an unsaturated polyester resin coating and analysis are shown in the text, and the addition of the hexa (4-hydroxymethyl phenoxy) cyclotriphosphazene flame retardant can improve the thermal stability and the ablation resistance of the unsaturated polyester resin coating, and the linear ablation rate is reduced from 0.75 mm/s to 0.36 mm/s. However, when the phosphazene flame retardant content is increased from 0 to 40 parts, the viscosity of the blank resin is 400 MPa.s, when the phosphazene flame retardant content is 8 parts, the viscosity of the mixed slurry is increased to 41000 MPa.s, and when the phosphazene flame retardant content is 40 parts, the viscosity is increased to 98000 MPa.s, so that the process performance is seriously affected. In the first article of research on the influence of OPS compounds on the performance of an unsaturated polyester resin coating layer, the ablation rate of the unsaturated polyester resin coating layer is reduced from about 0.75 mm/s of a blank resin to 0.63 mm/s under the condition that the OPS dosage is 7.4%, the viscosity of the coating layer reaches 6252 MPa s under the condition that the OPS dosage is increased to 17.0%, and the viscosity of the coating layer is increased to 34800 MPa s sharply, so that the process performance of the coating layer sizing material is deteriorated, and the casting process is adversely affected. According to the analysis of the prior art, with the development of the charging technology, the requirements on the ablation resistance of the coating layer are higher and higher, and meanwhile, the ablation resistance of the unsaturated polyester resin coating layer can be improved through compounding of the filler, but the process performance of the unsaturated polyester resin coating layer is often deteriorated, defects such as air holes are generated in the casting process, and the yield of products is greatly reduced. Disclosure of Invention Aiming at the defects and shortcomings in the prior art, the invention aims to provide a castable ablation-resistant coating material and a preparation method thereof, and solves the technical problem that the unsaturated polyester resin coating material prepared by the prior art is difficult to have excellent ablation resistance and pouring process performance. In order to solve the technical problems, the invention adopts the following technical scheme: A castable ablation-resistant coating material consists of unsaturated polyester resin, cobalt naphthenate, cyclohexanone peroxide, trichlor