CN111645346A - Continuous forming and sheet discharging method for rubber heat insulation layer - Google Patents
Continuous forming and sheet discharging method for rubber heat insulation layer Download PDFInfo
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- CN111645346A CN111645346A CN202010465348.3A CN202010465348A CN111645346A CN 111645346 A CN111645346 A CN 111645346A CN 202010465348 A CN202010465348 A CN 202010465348A CN 111645346 A CN111645346 A CN 111645346A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D7/00—Producing flat articles, e.g. films or sheets
- B29D7/01—Films or sheets
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L61/00—Compositions of condensation polymers of aldehydes or ketones; Compositions of derivatives of such polymers
- C08L61/04—Condensation polymers of aldehydes or ketones with phenols only
- C08L61/06—Condensation polymers of aldehydes or ketones with phenols only of aldehydes with phenols
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
- C08L2205/025—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
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Abstract
The invention provides a continuous molding and sheet-discharging method for a rubber heat-insulating layer. Compared with the traditional manual film discharging method, the invention can obtain the heat-insulating film with adjustable size and specification and controllable surface quality only by one-time feeding operation, thereby greatly reducing the labor intensity and obviously improving the production efficiency and quality consistency of products; the invention uses the continuous forming film-discharging and film-automatically cutting device, has high automation degree, good safety, simple operation, no pollution, small device occupation area and easy industrialized popularization.
Description
Technical Field
The invention belongs to the technical field of processing and forming of polymer composite materials, and particularly relates to a continuous forming and sheet-discharging method for a high-solid-content and high-viscosity rubber heat-insulating layer.
Background
The rubber heat insulating layer sheet is a passive heat protection material which is paved on the inner wall surface of the solid engine shell and is arranged between the shell and the propellant. During the engine ignition operation, the heat insulation layer can absorb heat through self ablation and decomposition, slow down the transmission of high temperature gas to the casing, avoid the casing high temperature to lead to structural integrity to become invalid, influence the normal work of engine under high temperature, high pressure gas environment. In the past decades, the rubber heat insulation layer is widely applied to a solid engine combustion chamber by the characteristics of low density, ablation resistance and flexibility and easiness in construction, and plays an important role in solving the problem of engine thermal protection.
A paster mould pressing method is generally adopted for forming the heat insulation layer in the engine combustion chamber, and a heat insulation layer sheet material is generally adopted as the material. The heat insulating sheet is generally prepared by pressing the rubber compound into a sheet of rubber having a certain thickness and width by means of a two-roll mill or a calender, and then applying the sheet. The above process for manufacturing the heat insulating sheet has many problems including high labor intensity, poor quality uniformity, low film size control accuracy, low film production efficiency, etc. Korea and the like (research and development and characteristics of a novel film extrusion molding unit, special rubber products, 2006, 27), Liuming strength and the like (ethylene propylene diene monomer waterproof sheet extrusion continuous vulcanization production line, rubber and plastic technology and equipment, 2001, 27) respectively report the rubber material extrusion and tabletting integrated molding process, and the tabletting quality and efficiency are obviously improved. However, compared with common rubber materials, the rubber heat insulation layer contains a large amount of fibers and ablation-resistant fillers and has the characteristics of high solid content and high viscosity. If the extrusion pressure is insufficient, the feeding capacity of the heat insulating layer is insufficient, and a wide sheet with uniform quality is difficult to extrude; if the extrusion pressure is too high, the fibers can be broken under the action of strong shearing, and the comprehensive performance of the heat insulation layer is influenced. It follows that the special material properties of the insulating layer present technical challenges for its continuous sheet forming process.
Disclosure of Invention
Technical problem to be solved
In order to overcome the defects of the traditional double-roller and calender heat insulation layer sheet-discharging process, the invention provides a continuous forming sheet-discharging method for a rubber heat insulation layer with high automation degree, which combines a typical heat insulation layer formula, selects a continuous extrusion forming sheet-discharging mode matched with the material characteristics of the heat insulation layer, solves the technical problems of continuous sheet-discharging of the heat insulation layer, size and specification control of a film and in-situ monitoring of sheet-discharging quality by scientifically and reasonably designing a feeding unit, a forming unit and a receiving and transmitting unit, and meets the requirements of weapon models on large quantities of heat insulation films.
(II) technical scheme
In order to solve the technical problem, the invention provides a continuous forming and sheet discharging method for a rubber heat insulation layer, which comprises the following steps:
s1 preparation of ablation-resistant rubber compound
Plasticating the base rubber on an open mill, sequentially adding the ablation-resistant functional filler and a vulcanizing agent after accumulation rubber appears, and obtaining ablation-resistant rubber compound after thin-passing and mixing;
s2, ablation-resistant heat-insulating layer rubber mixing sheet
Adding the ablation-resistant rubber compound prepared in the step S1 into a high-pressure feeding device of the heat-insulating layer rubber compound through a feeding port, mixing and plasticizing the rubber compound, and conveying the rubber compound to an extrusion molding device to obtain a heat-insulating layer rubber sheet with required width and thickness; further homogenizing and cooling the film by a traction device; detecting the surface quality of the film by a film surface detection device; the film flows to an automatic cutting and conveying device for cutting, and the heat insulation layer film with the required length is obtained.
Further, the base rubber is ethylene propylene diene monomer rubber, organic silicon rubber or nitrile rubber.
Further, in step S1, the total filling amount of the ablation-resistant functional filler is 26% to 110% of the weight of the base rubber.
Further, the ablation-resistant functional filler is one or more of ablation-resistant fiber, ablation-resistant silicon resin, ablation-resistant phenolic resin, silicon carbide, silicon dioxide and polysilsesquioxane.
Further, step S1 specifically includes: plasticating 100 parts by mass of base rubber on an open mill to generate accumulation rubber; adjusting the roller distance to 0.2mm, adding 5-25 parts by mass of ablation-resistant fibers, and performing thin pass for 3-8 times; adjusting the roller spacing to 2mm, sequentially adding 5-20 parts by mass of ablation-resistant silicon resin, 5-20 parts by mass of ablation-resistant phenolic resin and 1-10 parts by mass of polysilsesquioxane, cutting the rubber, turning and mixing for 3 min; keeping the roller spacing unchanged, sequentially adding 5-20 parts by mass of silicon carbide and 5-20 parts by mass of silicon dioxide, and mixing for 3 min; adjusting the roller spacing to 0.5mm, and performing thin pass for 3 times; keeping the roll spacing unchanged, adding a vulcanizing agent, and mixing for 2 min; obtaining the ablation-resistant rubber compound, and cooling and standing for 24 h.
Further, the feeding device in step S2 is composed of a feeding part, a screw and a cylinder; the screw is conical, the length-diameter ratio is (10:1) - (20:1), the screw is arranged into a main thread and auxiliary thread and baffle combined structure, the number of the auxiliary threads is 1-10, and the number of the baffles is 1-5; the inner wall of the machine barrel is provided with a pin structure, the number of pin rows is 1-5, and each row of pins is 2-10.
Further, in step S2, the film surface detection device is used to perform in-situ real-time detection on the cracks and holes with the film surface size of 1-50 mm.
Further, in step S2, extruding the heat insulation layer rubber sheet with the width of 0.4-1.0 mm and the thickness of 2-20 mm by an extrusion molding device.
Further, in step S2, the film passes through an automatic cutting and conveying device, and the heat insulation layer film with the length of 0.05-5 m is cut and collected.
(III) advantageous effects
The invention provides a continuous molding and sheet-discharging method for a rubber heat-insulating layer. Compared with the traditional manual film discharging method, the invention can obtain the heat-insulating film with adjustable size and specification and controllable surface quality only by one-time feeding operation, thereby greatly reducing the labor intensity and obviously improving the production efficiency and quality consistency of products; the invention uses the continuous forming film-discharging and film-automatically cutting device, has high automation degree, good safety, simple operation, no pollution, small device occupation area and easy industrialized popularization.
Drawings
FIG. 1 is a schematic structural view of an ablation-resistant heat-insulating layer continuous molding sheet-forming and film-sheet automatic cutting device used in the rubber heat-insulating layer continuous molding sheet-forming method of the embodiment of the present invention;
FIG. 2 is a schematic structural view of a high-pressure feeding device for a heat-insulating layer used in a method for continuously forming a rubber heat-insulating layer into a sheet according to an embodiment of the present invention.
Detailed Description
In order to make the objects, contents and advantages of the present invention clearer, the following detailed description of the embodiments of the present invention will be made in conjunction with the accompanying drawings and examples.
The embodiment provides a continuous molding and sheet-discharging method for a rubber heat-insulating layer
S1 preparation of ablation-resistant rubber compound
Plasticating 100 parts by mass of base rubber on an open mill to generate accumulation rubber; adjusting the roller spacing to 0.2mm, adding 15 parts by mass of ablation-resistant fibers, and performing thin pass for 3 times; adjusting the roller spacing to 2mm, sequentially adding 10 parts by mass of ablation-resistant silicon resin, 15 parts by mass of ablation-resistant phenolic resin and 5 parts by mass of polysilsesquioxane, cutting the rubber, turning and mixing for 3 min; keeping the roller spacing unchanged, sequentially adding 20 parts by mass of silicon carbide and 20 parts by mass of silicon dioxide, and mixing for 3 min; adjusting the roller spacing to 0.5mm, and performing thin pass for 3 times; keeping the roll spacing unchanged, adding a vulcanizing agent, and mixing for 2 min; obtaining the ablation-resistant rubber compound, and cooling and standing for 24 h.
S2, ablation-resistant heat-insulating layer rubber mixing sheet
The continuous forming of the ablation-resistant insulation layer into sheets and the automatic film cutting process are carried out on an apparatus as shown in figure 1. Firstly, adding the ablation-resistant rubber compound prepared in the step S1 into a heat-insulating layer rubber compound high-pressure feeding device B through a feeding port A, wherein a pressurizing module is arranged in the high-pressure feeding device B to ensure the stable output and effective metering of the high-solid-content ablation-resistant rubber compound, the rubber compound is subjected to mixing plasticization and is stably conveyed to an extrusion molding device C, the extrusion molding device can ensure the continuous sheet discharge of a rubber compound melt with higher width, the thickness of a rubber sheet is effectively controlled, and the rubber sheet heat-insulating layer with the width of 500mm and the thickness of 4mm is obtained through an extrusion machine head under the assistance of the pressurizing module; further homogenizing and cooling the film by a traction device D, adopting an optical detection device as a film surface quality control unit, and carrying out in-situ real-time detection on cracks and holes with the surface size of 1-50 mm on the film by a film surface detection device E; then, the film flow is transferred to an automatic cutting transmission device F for cutting, and the automatic cutting transmission device F is used as a film size control and collection unit, so that the film with the length of 500mm is obtained. After 1 hour, the film is continuously taken out, and 500kg of high-solid content ablation-resistant heat-insulating layer film with the size specification of 4mm multiplied by 500mm is obtained. The heat insulating layer has no length deviation, width and thickness deviation less than 5%, regular sheet edge and no visible holes and cracks on the surface.
Wherein, as shown in FIG. 2, the feeding means is composed of a feeding member, a screw 1 and a cylinder 2. The screw 1 is conical, the length-diameter ratio is (10:1) - (20:1), the screw 1 is arranged into a combined structure of a main thread 3 and an auxiliary thread 3 and baffles 4, the number of the auxiliary threads is 1-10, and the number of the baffles is 1-5; the inner wall of the machine barrel 2 is provided with a pin structure, the number of the pin rows is 1-5, and each row of pins is 2-10.
Comparative examples
S1, preparing an ablation-resistant layer rubber compound: same as step S1 of the embodiment;
s2, ablation-resistant heat-insulating layer rubber mixing sheet
Adjusting the roll distance of the open mill to be 4mm and the width of the rubber baffle plate to be 500mm according to the size requirement of the rubber sheet; and (4) putting the ablation-resistant rubber compound prepared in the step S1 into an open mill for plasticating, and cutting and discharging rubber when uniformly distributed stacking rubber is generated between two rollers. After 1 hour, 50kg of high-solid ablation-resistant heat-insulating layer rubber sheet with the thickness of 4mm and the width of 500mm is obtained. The length of the heat insulating layer sheet is uncontrollable, the deviation of the width and the thickness is less than 25 percent, and the edge of the sheet is rough.
As can be seen from the above examples and comparative examples, the open mill used in the conventional manual sheet discharging method cannot be used for continuous production, and the sheet discharging efficiency is directly related to the maximum glue feeding amount of the open mill at one time. According to the continuous forming and sheet discharging method for the rubber heat insulating layer, provided by the invention, the high-pressure feeding and extrusion forming device is utilized, the automatic cutting and conveying device is combined, the preparation efficiency of the heat insulating layer sheet can be obviously improved, and the production capacity of the heat insulating layer sheet is 300-1000 kg/h. In addition, the roll spacing of the open mill used in the traditional sheet discharging method is manually adjusted, so that the consistency of the roll spacing at two ends is difficult to ensure, and the consistency of the thickness of the sheet is poor; the control capability of the glue baffle plate on the width of the film is insufficient, the edge film climbs due to overhigh glue feeding amount, and the width is increased; the rubber sheet is strained due to the strong shearing of the rubber material by the double rollers, and defects and cracks are easily generated under the action of internal stress after the rubber sheet is taken down. Compared with the traditional manual sheet discharging method, the sheet prepared by the invention has controllable size, obviously improved sheet discharging quality,
the above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (9)
1. The continuous forming and sheet-discharging method for the rubber heat-insulating layer is characterized by comprising the following steps of:
s1 preparation of ablation-resistant rubber compound
Plasticating the base rubber on an open mill, sequentially adding the ablation-resistant functional filler and a vulcanizing agent after accumulation rubber appears, and obtaining ablation-resistant rubber compound after thin-passing and mixing;
s2, ablation-resistant heat-insulating layer rubber mixing sheet
Adding the ablation-resistant rubber compound prepared in the step S1 into a high-pressure feeding device of the heat-insulating layer rubber compound through a feeding port, mixing and plasticizing the rubber compound, and conveying the rubber compound to an extrusion molding device to obtain a heat-insulating layer rubber sheet with required width and thickness; further homogenizing and cooling the film by a traction device; detecting the surface quality of the film by a film surface detection device; the film flows to an automatic cutting and conveying device for cutting, and the heat insulation layer film with the required length is obtained.
2. The continuous sheet-forming process according to claim 1, wherein the base rubber is ethylene propylene diene monomer, silicone rubber or nitrile rubber.
3. The continuous molding sheet-forming method according to claim 1, wherein in step S1, the ablation-resistant functional filler is filled in a total amount of 26% to 110% by weight based on the weight of the base rubber.
4. The continuous form-out process of claim 1, wherein the ablation-resistant functional filler is one or more of ablation-resistant fibers, ablation-resistant silicone, ablation-resistant phenolic resin, silicon carbide, silica, polysilsesquioxane.
5. The continuous molding sheet-forming method according to claim 4, wherein the step S1 specifically includes: plasticating 100 parts by mass of base rubber on an open mill to generate accumulation rubber; adjusting the roller distance to 0.2mm, adding 5-25 parts by mass of ablation-resistant fibers, and performing thin pass for 3-8 times; adjusting the roller spacing to 2mm, sequentially adding 5-20 parts by mass of ablation-resistant silicon resin, 5-20 parts by mass of ablation-resistant phenolic resin and 1-10 parts by mass of polysilsesquioxane, cutting the rubber, turning and mixing for 3 min; keeping the roller spacing unchanged, sequentially adding 5-20 parts by mass of silicon carbide and 5-20 parts by mass of silicon dioxide, and mixing for 3 min; adjusting the roller spacing to 0.5mm, and performing thin pass for 3 times; keeping the roll spacing unchanged, adding a vulcanizing agent, and mixing for 2 min; obtaining the ablation-resistant rubber compound, and cooling and standing for 24 h.
6. The continuous molding sheet-forming method according to claim 1, wherein said feeding means in step S2 is comprised of a feeding member, a screw and a cylinder; the screw is conical, the length-diameter ratio is (10:1) - (20:1), the screw is arranged into a main thread and auxiliary thread and baffle combined structure, the number of the auxiliary threads is 1-10, and the number of the baffles is 1-5; the inner wall of the machine barrel is provided with a pin structure, the number of pin rows is 1-5, and each row of pins is 2-10.
7. The continuous forming and film discharging method according to claim 1, wherein in step S2, the film surface detection device is used to perform in-situ real-time detection on cracks and holes with a size of 1-50 mm on the film surface.
8. The continuous molding and sheeting method of claim 1, wherein in step S2, a heat insulating layer sheeting having a width of 0.4 to 1.0mm and a thickness of 2 to 20mm is extruded through the extrusion molding device.
9. The continuous molding and film-out method according to claim 1, wherein in step S2, the film is cut and collected by an automatic cutting and conveying device, and the length of the film is 0.05-5 m.
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| CN202010465348.3A CN111645346B (en) | 2020-05-28 | 2020-05-28 | Continuous forming and sheet discharging method for rubber heat insulation layer |
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| CN202010465348.3A CN111645346B (en) | 2020-05-28 | 2020-05-28 | Continuous forming and sheet discharging method for rubber heat insulation layer |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113977997A (en) * | 2021-10-28 | 2022-01-28 | 四川大学 | Preparation method of multilayer heat-insulating material |
| CN114437464A (en) * | 2021-12-20 | 2022-05-06 | 西安近代化学研究所 | Preparation method of ablation-resistant low-thermal-conductivity composite material |
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| CN107057197A (en) * | 2017-04-11 | 2017-08-18 | 湖北三江航天江河化工科技有限公司 | A kind of fibre reinforced ethylene propylene diene monomer (EPDM) material and preparation method |
| CN109337216A (en) * | 2018-09-17 | 2019-02-15 | 诺弗斯绝热材料有限公司 | A kind of rubber-plastic heat insulation material for air-conditioning heat-insulation system |
| CN109851924A (en) * | 2018-12-05 | 2019-06-07 | 湖北航天化学技术研究所 | A kind of EPDM insulation layer material and its preparation method and application |
| CN110802848A (en) * | 2019-11-13 | 2020-02-18 | 西安近代化学研究所 | Ablation-resistant low-thermal-conductivity rubber composite material and preparation method thereof |
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2020
- 2020-05-28 CN CN202010465348.3A patent/CN111645346B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107057197A (en) * | 2017-04-11 | 2017-08-18 | 湖北三江航天江河化工科技有限公司 | A kind of fibre reinforced ethylene propylene diene monomer (EPDM) material and preparation method |
| CN109337216A (en) * | 2018-09-17 | 2019-02-15 | 诺弗斯绝热材料有限公司 | A kind of rubber-plastic heat insulation material for air-conditioning heat-insulation system |
| CN109851924A (en) * | 2018-12-05 | 2019-06-07 | 湖北航天化学技术研究所 | A kind of EPDM insulation layer material and its preparation method and application |
| CN110802848A (en) * | 2019-11-13 | 2020-02-18 | 西安近代化学研究所 | Ablation-resistant low-thermal-conductivity rubber composite material and preparation method thereof |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113977997A (en) * | 2021-10-28 | 2022-01-28 | 四川大学 | Preparation method of multilayer heat-insulating material |
| CN113977997B (en) * | 2021-10-28 | 2022-12-02 | 四川大学 | Preparation method of multilayer heat-insulating material |
| CN114437464A (en) * | 2021-12-20 | 2022-05-06 | 西安近代化学研究所 | Preparation method of ablation-resistant low-thermal-conductivity composite material |
| CN114437464B (en) * | 2021-12-20 | 2023-08-01 | 西安近代化学研究所 | Preparation method of ablation-resistant low-heat-conductivity composite material |
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