Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Pretreatment method for improving adhesive force of silicon rubber coating on surface of titanium alloy storage tank

A technology of titanium alloy and silicone rubber, which is applied to the device for coating liquid on the surface, pretreatment surface, coating, etc., can solve the problems of bulging, high surface energy, engine failure, etc., and achieve process stability and heavy lifting. Good performance, good thermal stability, and the effect of increasing adhesion strength

Pending Publication Date: 2022-03-18
XIAN SPACE ENGINE CO LTD
View PDF5 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Because titanium alloy material is easy to passivate metal, it is easy to be oxidized in the air. After oxidation, its surface energy is high, and it cannot form a firm covalent bond with the silicone rubber coating, resulting in insufficient adhesion between the coating and the substrate.
In addition, the silicone rubber coating itself has a porous structure. Under the condition of 4.7MPa water pressure, a large amount of water penetrates into the film-base interface of the coating through the micropores, destroying the bonding state between the coating and the substrate, making it more prone to bulges, The peeling phenomenon will affect the heat insulation performance of the coating, and in severe cases will cause the engine to fail
[0004] After reviewing a large amount of data and consulting many companies, and using simulated parts to carry out verification tests, the existing titanium alloy surface spraying pretreatment process cannot meet the product hydraulic strength test (fill the tank with water, under the pressure of 4.7 MPa, keep pressure 10min) requirements

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] The outer surface of the metal diaphragm (thickness 0.47±0.03mm) of the spherical conical tank made of TA1 material and the outer surface of the air chamber shell (thickness ) inner surface, use 40-mesh corundum sand, and blow the sand evenly under the pressure of 0.3MPa. After cleaning the floating sand, use clean 120# gasoline to clean the parts to be sprayed. After thorough drying, 5% (wt%) pretreatment agent (anilinomethyltriethoxysilane solution) is sprayed on the inner surface of the storage tank from bottom to top along the circumferential direction, and the spraying distance is controlled at 100mm, and the spraying angle is not Less than 75°, the spraying pressure is controlled at 0.4MPa. Spray the silicone rubber coating after the pretreatment agent is sprayed and dried naturally for 25 minutes.

[0036] Carry out hydraulic strength test on the sprayed tank (fill the tank with water, keep the pressure at 4.7MPa for 10 minutes), and then conduct CT inspection....

Embodiment 2

[0038] The outer surface of the metal diaphragm (thickness 0.47±0.03mm) of the spherical conical tank made of TA1 material and the outer surface of the air chamber shell (thickness ) inner surface, use 40-mesh corundum sand, and blow the sand evenly under the pressure of 0.3MPa. After cleaning the floating sand, use clean 120# gasoline to clean the parts to be sprayed. After thorough drying, 10% (wt%) pretreatment agent (anilinomethyltriethoxysilane solution) is sprayed on the inner surface of the storage tank from bottom to top along the circumferential direction, and the spraying distance is controlled at 150mm, and the spraying angle is not Less than 75°, the spraying pressure is controlled at 0.4MPa. Spray the silicone rubber coating after the pretreatment agent is sprayed and dried naturally for 40 minutes.

[0039] Carry out hydraulic strength test on the sprayed tank (fill the tank with water, keep the pressure at 4.7MPa for 10 minutes) and then conduct CT inspection. ...

Embodiment 3

[0041] The outer surface of the metal diaphragm (thickness 0.47±0.03mm) of the spherical conical tank made of TA1 material and the outer surface of the air chamber shell (thickness ) inner surface, use 40-mesh corundum sand, and blow the sand evenly under the pressure of 0.3MPa. After cleaning the floating sand, use clean 120# gasoline to clean the parts to be sprayed. After being thoroughly dried, 10% (wt%) pretreatment agent (anilinomethyltriethoxysilane solution) is sprayed on the inner surface of the storage tank from bottom to top along the circumferential direction, and the spraying distance is controlled at 100mm, and the spraying angle is not Less than 75°, the spraying pressure is controlled at 0.6MPa. Spray the silicone rubber coating after the pretreatment agent is sprayed and dried naturally for 25 minutes.

[0042] Carry out hydraulic strength test on the sprayed tank (fill the tank with water, keep the pressure at 4.7MPa for 10 minutes) and then conduct CT insp...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
thicknessaaaaaaaaaa
Login to View More

Abstract

The invention provides a pretreatment method for improving adhesive force of a silicon rubber coating on the surface of a titanium alloy storage box, which comprises the following steps: step 1, uniformly blowing sand at least once on a to-be-sprayed part of the storage box by using 40-60-mesh emery under the sand blowing pressure of 0.3-0.4 MPa, and ensuring 100% coverage sand blowing; 2, the surface of the product subjected to sand blasting is cleaned up, then the to-be-sprayed part of the product is cleaned up through an organic solvent, and then drying treatment is conducted; step 3, uniformly spraying a pretreating agent on the to-be-sprayed part for at least one time, wherein the pretreating agent is required to completely cover the surface of the to-be-sprayed part; and 4, after the pretreatment agent is sprayed, natural drying is conducted, silicone rubber coating is sprayed after it is guaranteed that the solvent is thoroughly volatilized, the sprayed storage box meets the hydraulic strength test requirement, in other words, the storage box is filled with water, the pressure is kept for 10 min under the pressure of 4.7 MPa, and after the test, the coating and the base body are well attached, and no bulging or falling-off phenomenon exists.

Description

technical field [0001] The invention belongs to the technical field of spraying, and in particular relates to a pretreatment method for improving the adhesion of a silicone rubber coating on the surface of a spherical conical titanium alloy tank. After pretreatment, the adhesion strength between the silicone rubber coating and the titanium substrate can meet the requirements of the product The working conditions require that after the hydraulic strength test (fill the tank with water, hold the pressure for 10 minutes under the pressure of 4.7MPa), the coating will not produce any bad phenomena such as bulging or falling off. Background technique [0002] A liquid rocket engine adopts a hot gas self-pressurization system, relying on high-temperature and high-pressure gas to pressurize the air cavity, causing the metal diaphragm to deform and turn over, and the propellant is squeezed into the delivery pipeline. Long-term flushing of high-temperature gas will cause the temperat...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): B05D7/24B05D7/14B05D3/00B05D7/00B05D5/00C09D183/08
CPCB05D7/24B05D7/14B05D3/002B05D7/544B05D5/00C09D183/08
Inventor 薛露平许维超高仙芝黑爱卿刘兴斌徐锐邓新波
Owner XIAN SPACE ENGINE CO LTD
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com