A sheet discharging process method suitable for ethylene-propylene-diene rubber heat-insulating material

Abstract

The application discloses a sheet discharging process method suitable for a three-element ethylene-propylene rubber heat-insulating material, and mainly realizes sheet discharging of the three-element ethylene-propylene rubber heat-insulating material with different thicknesses by adjusting the roller speed of a double-roller open mill. Compared with a traditional sheet discharging process, the process is simple in operation, and the thickness of the heat-insulating material is obviously increased, and the surface defects of the heat-insulating material are reduced. The process has excellent process performance, and is suitable for the three-element ethylene-propylene rubber mixing technical field, and is particularly suitable for the field of the three-element ethylene-propylene rubber heat-insulating material used in cooperation with solid propellants in solid rocket engines.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of ablation-resistant materials, and particularly relates to a sheet discharging process method suitable for a three-element ethylene-propylene rubber heat-insulating material. BACKGROUND

[0002] The heat-insulating layer is a kind of heat-insulating material for a heat protection material of an engine, and is a non-metal heat protection material located between the inner surface of a shell and propellant. The main function of the heat-insulating layer is to resist the flushing of propellant gas, inhibit surface combustion and prevent the shell from reaching a temperature that can damage the structural integrity of the shell under the harsh working conditions of continuous high temperature (higher than 3500K) and high pressure (3-20 MPa or even higher) gas flow generated by the propellant fuel, so as to ensure the normal working of the engine.

[0003] With the improvement of weapon systems, the performance requirements for heat-insulating materials are getting higher and higher. In order to improve the performance of the heat-insulating materials, a large amount of functional fillers need to be filled. However, due to the reduction of the glue content, the heat generation speed of the heat-insulating materials is accelerated under the high-speed shearing and friction of the open mill, which leads to the problems of easy sticking of the heat-insulating materials to the roller, layering and the like, and the process performance is significantly reduced, so the production demand cannot be met. Therefore, in order to effectively improve the sheet discharging process of the EPDM heat-insulating material, a high-efficiency sheet discharging process needs to be designed and developed. SUMMARY

[0004] The technical problem to be solved by the application is to overcome the defects of the prior art, and to provide a sheet discharging process method suitable for a three-element ethylene-propylene rubber heat-insulating material.

[0005] To solve the above technical problems, the application provides the following technical solutions:

[0006] The sheet discharging process method suitable for the three-element ethylene-propylene rubber heat-insulating material is realized by adjusting the roller speed of a double-roller open mill to realize the sheet discharging of the three-element ethylene-propylene heat-insulating material with different thicknesses.

[0007] The double-roller open mill is a double-motor independently driven front and rear roller, the outer diameters of the front and rear rollers are the same, the rotating speed is freely adjusted at 5-20 rpm, and the roller speed ratio is the ratio of the rotating speeds of the front and rear rollers.

[0008] The three-element ethylene-propylene heat-insulating material is an organic fiber filled three-element ethylene-propylene rubber composite material.

[0009] The three-element ethylene-propylene heat-insulating material is processed by using the double-roller open mill as follows,

[0010] The first step is thin passing of the three-element ethylene-propylene heat-insulating material.

[0011] The three-element ethylene-propylene rubber is thin passed 4-6 times by using the double-roller open mill, the thin passing thickness is 0.30-0.50 mm, the roller rotating speed is 14-20 rpm, and the roller speed ratio is (1.25-1.50):1.

[0012] Second step of the ethylene-propylene-diene ternary heat insulation material.

[0013] The ethylene-propylene-diene ternary heat insulation material is discharged by adjusting the roller speed and the roller gap of the double roller mill. The roller speed is 8-12 rpm, and the roller speed ratio is 1.05-1.25. The optimal value is found by adjusting the roller speed ratio within the range according to the characteristics of the heat insulation material.

[0014] Preferably, the roller speed ratio of the double roller mill is (1.3-1.50):1 during the thinning process.

[0015] The present application mainly realizes the discharge of ethylene-propylene-diene ternary heat insulation materials with different thicknesses by adjusting the roller speed of the double roller mill.

[0016] In summary, the present application has at least the following beneficial technical effects:

[0017] (1) Compared with the traditional discharge process, the present application is simple to operate, and significantly improves the discharge thickness of the heat insulation material and reduces the surface defects of the heat insulation material.

[0018] (2) The present application has excellent process performance. The present application is suitable for the mixing technology field of ethylene-propylene-diene rubber, and is particularly suitable for the field of ethylene-propylene-diene rubber heat insulation materials used in combination with solid propellants in solid rocket engines. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 The appearance of the heat insulation layer discharged in Example 1 of the present application is shown in Figure 1.

[0020] Figure 2 The appearance of the heat insulation layer discharged in Example 2 of the present application is shown in Figure 2.

[0021] Figure 3 The appearance of the heat insulation layer discharged in Example 3 of the present application is shown in Figure 3.

[0022] Figure 4 The appearance of the heat insulation layer discharged in Example 4 of the present application is shown in Figure 4.

[0023] Figure 5 The appearance of the heat insulation layer discharged in Comparative Example 1 of the present application is shown in Figure 5.

[0024] Figure 6 The appearance of the heat insulation layer discharged in Comparative Example 2 of the present application is shown in Figure 6. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solutions and advantages of the present application clearer and more apparent, the present application will be further described in detail below with reference to the examples. It should be understood that the specific examples described herein are only used to explain the present application and do not limit the present application.

[0026] Example 1: The ternary ethylene-propylene heat-insulating material 124 was thinned 5 times by using a double-roller mill with a roller diameter of 400 mm and a double-motor type, the thinning thickness was 0.4 mm, the front and rear roller speeds were 20 rpm and 16 rpm respectively, and the roller speed ratio was 1.25; the ternary ethylene-propylene heat-insulating material after thinning was sheeted to 3 mm by adjusting the front and rear roller speeds and the roller gap of the double-roller mill, the front and rear roller speeds were 11 rpm and 10 rpm respectively, and the roller speed ratio was 1.10.

[0027] Example 2: The ternary ethylene-propylene heat-insulating material 124 was thinned 4 times by using a double-roller mill with a roller diameter of 400 mm and a double-motor type, the thinning thickness was 0.5 mm, the front and rear roller speeds were 19 rpm and 14 rpm respectively, and the roller speed ratio was 1.36; the ternary ethylene-propylene heat-insulating material after thinning was sheeted to 3 mm by adjusting the front and rear roller speeds and the roller gap of the double-roller mill, the front and rear roller speeds were 10 rpm and 9 rpm respectively, and the roller speed ratio was 1.11.

[0028] Example 3: The ternary ethylene-propylene heat-insulating material 129 was thinned 5 times by using a double-roller mill with a roller diameter of 450 mm and a double-motor type, the thinning thickness was 0.4 mm, the front and rear roller speeds were 20 rpm and 15 rpm respectively, and the roller speed ratio was 1.33; the ternary ethylene-propylene heat-insulating material after thinning was sheeted to 3 mm by adjusting the front and rear roller speeds and the roller gap of the double-roller mill, the front and rear roller speeds were 12 rpm and 10 rpm respectively, and the roller speed ratio was 1.2.

[0029] Example 4: The ternary ethylene-propylene heat-insulating material 129 was thinned 5 times by using a double-roller mill with a roller diameter of 450 mm and a double-motor type, the thinning thickness was 0.4 mm, the front and rear roller speeds were 18 rpm and 14 rpm respectively, and the roller speed ratio was 1.29; the ternary ethylene-propylene heat-insulating material after thinning was sheeted to 4 mm by adjusting the front and rear roller speeds and the roller gap of the double-roller mill, the front and rear roller speeds were 12 rpm and 11 rpm respectively, and the roller speed ratio was 1.09.

[0030] Comparative Example 1: The ternary ethylene-propylene heat-insulating material 124 was thinned 5 times by using a double-roller mill with a roller diameter of 400 mm and a traditional type, the front and rear roller speeds were 20 rpm and 16 rpm respectively, and the roller speed ratio was 1.25; the ternary ethylene-propylene heat-insulating material after thinning was sheeted to 4 mm by adjusting the roller gap of the double-roller mill, the front and rear roller speeds were 20 rpm and 16 rpm respectively, and the roller speed ratio was 1.25.

[0031] Comparative Example 2: The ternary ethylene-propylene heat-insulating material 129 was thinned 5 times by using a double-roller mill with a roller diameter of 400 mm and a double-motor type, the thinning thickness was 0.4 mm, the front and rear roller speeds were 20 rpm and 16 rpm respectively, and the roller speed ratio was 1.25; the ternary ethylene-propylene heat-insulating material after thinning was sheeted to 3 mm by adjusting the front and rear roller speeds and the roller gap of the double-roller mill, the front and rear roller speeds were 17 rpm and 16 rpm respectively, and the roller speed ratio was 1.06.

[0032] The above test results show that the heat insulation materials of Examples 1 to 4 can achieve a thickness of 3 mm to 4 mm, and the rubber compound is smooth in appearance without obvious defects; while the skinning and delamination on both sides occur in Comparative Examples 1 and 2 respectively, and the sheeting cannot be achieved.

[0033] From the above examples and comparative examples, it can be seen that if either the roller speed or the roll speed ratio exceeds the limitation of the present application in the comparative examples, the skinning or delamination on both sides will occur, so the roller speed and the roll speed ratio need to meet the limitation of the present application at the same time, and then the double roll mill can be used to efficiently sheet the heat insulation material of ethylene-propylene-diene rubber.

[0034] The above only describes the preferred embodiments of the present application and is not intended to limit the present application, and any modification, equivalent replacement and improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A process for sheeting suitable for use in a ternary ethylene propylene rubber thermal insulation material, characterised in that: The following processes are performed on the ternary EP heat insulation material using a two-roller open mill, Thin passing of the ternary EP heat insulation material; Sheeting of the ternary EP heat insulation material after thin passing, during which the roller speed of the two-roller open mill is 8-12 rpm, the roller speed ratio is (1.05-1.20):1, and the sheeting thickness of the ternary EP heat insulation material is 3 mm or 4 mm; The two-roller open mill is independently driven by double motors, and the roller speed ratio is the ratio of the front and rear roller speeds; The thin passing of the ternary EP heat insulation material is performed 4-6 times; The thin passing thickness is 0.30-0.50 mm; During the thin passing, the roller speed of the two-roller open mill is 14-20 rpm; During the thin passing, the roller speed ratio of the two-roller open mill is (1.25-1.50):

1.

2. The process for sheeting suitable for ethylene propylene diene rubber thermal insulation material according to claim 1, characterized in that: The ternary EP heat insulation material is an organic fiber-filled ternary EP rubber composite material.

3. The process for sheeting of ethylene propylene diene rubber thermal insulation material as claimed in claim 1 wherein: During the thin passing, the roller speed ratio of the two-roller open mill is (1.3-1.50):1.

Images